CN219236229U - Reinforced composite pipe and manufacturing equipment thereof - Google Patents

Abstract

The utility model relates to the field of composite pipe manufacturing, and discloses a reinforced composite pipe and manufacturing equipment thereof, wherein the manufacturing equipment comprises a winding composite roller set (1), a plastic inner sheet extrusion unit (2), a pipe wall reinforcing sheet release unit (3) and a plastic protection sheet extrusion unit (4), the plastic inner sheet extrusion unit (2) can extrude a plastic inner sheet (23) to rollers (11, 12 and 13) of the winding composite roller set (1) to form a plastic inner layer (20), the pipe wall reinforcing sheet release unit (3) is used for releasing pipe wall reinforcing sheets (32) to the outer peripheral surface of the plastic inner layer (20) to form a pipe wall reinforcing layer (30), and the plastic protection sheet extrusion unit (4) can extrude plastic protection sheets (43) to the pipe wall reinforcing layer (30) to form a plastic protection layer (40). The manufacturing apparatus is suitable for manufacturing a multi-layer reinforced composite pipe reinforced by a pipe wall reinforcing layer in actual production.

Description

Reinforced composite pipe and manufacturing equipment thereof

Technical Field

The utility model relates to composite pipe manufacturing, in particular to manufacturing equipment for reinforced composite pipes. In addition, the utility model also relates to a reinforced composite pipe.

Background

Single layer rubber or plastic pipes reinforced with reinforcements such as steel wires have been widely used to transport various types of fluid media. In order to be able to carry out pressure transport in different construction environments, the prior art has also proposed reinforced composite pipes reinforced with reinforcing layers wound and clamped between layers of plastic to be able to withstand high internal pipe pressures and certain external pipe pressures, which is advantageous for easy selection of overhead or buried construction and can be used as fluid transport carriers such as gas transport pipes, pressure water supply pipes, etc.

However, such reinforced composite pipes are only at the design and conception stage, and in view of the limitations of manufacturing equipment, especially for large pipe diameter requirements, there has not been any aspect to be able to produce and provide the reinforced multilayer composite pipes described above. Accordingly, providing a manufacturing apparatus suitable for practical use that is capable of producing a multi-layer reinforced composite tube reinforced with a reinforcing layer is a technical problem that has long been desired to be solved but has not been successful.

In addition, since the plastic layers of the reinforced composite pipe are separated from each other by the reinforcing layers, which are generally made of different materials from the plastic layers, it is difficult to ensure good bonding between the layers during the manufacturing process, and thus delamination and relative slippage between the different pipe layers are liable to occur during transportation, construction and use.

Disclosure of Invention

The object of the present utility model is to provide a manufacturing apparatus for a reinforced composite pipe, which is suitable for manufacturing a multi-layer reinforced composite pipe reinforced by a reinforcing layer in actual production, has the advantage of being resistant to internal pressure and external pressure, so as to be selectively subjected to overhead construction or buried construction, and can be used as a fluid transport carrier such as a gas transport pipe, a pressure water supply pipe, etc.

In order to achieve the above object, an aspect of the present utility model provides an apparatus for manufacturing a reinforced composite pipe, comprising:

a winding composite roller group including a plurality of rollers arranged in a circumferential direction around a central axis to form an annular supporting circumferential surface, at least part of the rollers being capable of being driven to spin;

a plastic inner sheet extruder unit having at least one plastic inner sheet extruder and at least one plastic inner sheet extrusion die arranged inside the winding composite roller set, the plastic inner sheet extruder being capable of extruding plastic inner sheets toward the roller through the plastic inner sheet extrusion die so that the plastic inner sheets spirally extend along the annular supporting circumferential surface along with rotation of the roller and form a plastic inner layer circumferentially supported on the winding composite roller set;

a pipe wall reinforcing sheet releasing unit having a reinforcing sheet releasing device and configured to release the pipe wall reinforcing sheet stored in the reinforcing sheet releasing device onto the outer peripheral surface of the plastic inner layer so as to place the pipe wall reinforcing sheet on the outer peripheral surface of the plastic inner layer and to spirally wind the pipe wall reinforcing sheet on the outer peripheral surface of the plastic inner layer and form a pipe wall reinforcing layer as the plastic inner layer moves axially on the winding composite roller set; the method comprises the steps of,

The plastic protection sheet extrusion unit is provided with a plastic protection sheet extruder and a plastic protection sheet extrusion die arranged at the outer side of the winding composite roller set, and the plastic protection sheet extruder can extrude plastic protection sheets onto the outer peripheral surface of the pipe wall reinforcing layer through the plastic protection sheet extrusion die so that the plastic protection sheets are coated on the outer peripheral surface of the pipe wall reinforcing layer and spirally extend to form a plastic protection layer.

Preferably, the plurality of rollers of the winding composite roller group include upper and lower rollers symmetrically disposed on and below the central axis and a plurality of auxiliary rollers disposed on both sides of the central axis along a circumference Xiang Bu and having a smaller diameter than the upper and lower rollers, wherein the upper and lower rollers are connected to a first driving device, at least a portion of the auxiliary rollers are connected to a second driving device, or at least a portion of the auxiliary rollers disposed on one side of the central axis are connected to a second driving device, and at least a portion of the auxiliary rollers disposed on the other side of the central axis are connected to a third driving device so as to be capable of being driven to rotate, respectively.

Preferably, at least part of the ends of the auxiliary rollers are provided with sprockets and are in driving connection with each other by means of a driving chain connected to the sprockets so as to be able to be driven in synchronous rotation by the second or third driving means.

Preferably, the rotation axis of the drum and the central axis are different from each other so as to be capable of axially moving the plastic inner layer circumferentially supported by the winding composite roller group when the drum is driven to rotate.

Preferably, the plastic inner layer circumferentially supported on the winding composite roller set is driven by rotation of the drum to move in the axial direction while rotating around the central axis of the winding composite roller set, and the pipe wall reinforcing sheet released by the pipe wall reinforcing sheet releasing unit is spirally wound as:

the winding pitch is greater than the width of the pipe wall reinforcing sheet to form a spiral gap to allow the plastic protective layer formed by extrusion of the plastic protective sheet extruder set to be connected to the plastic inner layer through the spiral gap, or,

the winding pitch is less than the width of the tube wall reinforcing sheet to form a spiral lap.

Preferably, the pipe wall reinforcing sheet release unit includes a tension detecting device, a reinforcing sheet guiding device, and a reinforcing sheet heating device, which are disposed in this order along the release direction of the pipe wall reinforcing sheet, and the reinforcing sheet heating device is configured to heat the pipe wall reinforcing sheet at a position close to the winding composite roller group.

Preferably, the manufacturing equipment comprises at least two sets of pipe wall reinforcing sheet release units and at least two sets of plastic protective sheet extrusion units.

Preferably, the manufacturing apparatus further includes a scraping device provided above the winding composite roller set, the scraping device being configured to be capable of rolling or scraping an outer peripheral surface of the plastic protective layer.

Preferably, the manufacturing apparatus further includes:

a steel strip release molding unit configured to release a corrugated steel strip onto an outer peripheral surface of the plastic protective layer so as to spirally wind the corrugated steel strip onto the outer peripheral surface of the plastic protective layer;

and the plastic outer layer extrusion unit is provided with a plastic outer layer extruder and a plastic outer layer extrusion die, and can extrude and form a plastic outer layer on the outer peripheral surface of the corrugated steel belt spirally wound on the plastic protective layer through the plastic outer layer extrusion die.

Preferably, the manufacturing apparatus further comprises at least one of:

a. the upper pressing wheel assembly and the lower pressing wheel assembly are arranged at the trough position of the corrugated steel belt and are used for enabling materials extruded by the plastic outer layer extrusion die to cling to the corrugated steel belt to form the corrugated plastic outer layer;

b. The polishing wheel is arranged behind the plastic outer layer extrusion die along the laying spiral direction of the waveform steel belt and is used for polishing the minimum bending angle of the wavy steel belt wave foot;

c. the support sheet device is arranged behind the plastic inner sheet extrusion die along the spiral direction of the plastic inner sheet and is used for supporting the plastic inner sheet in an auxiliary mode;

d. a heating medium circulation runner arranged in at least part of the rollers and/or an electric heating element arranged in the winding composite roller set.

Preferably, the manufacturing apparatus further includes a bellows storage cladding unit configured to release the bellows clad with the molten plastic onto the outer peripheral surface of the plastic protective layer to spirally wind and weld the bellows onto the outer peripheral surface of the plastic protective layer.

A second aspect of the present utility model provides a reinforced composite pipe comprising a plastic inner layer, a pipe wall reinforcing layer and a plastic protective layer, which are sequentially disposed from inside to outside, wherein a fluid passage is defined in the plastic inner layer, the plastic inner layer and the plastic protective layer are respectively made of an extruded spirally-extending plastic inner sheet and a plastic protective sheet, and the pipe wall reinforcing layer is made of pipe wall reinforcing sheets spirally wound on the outer peripheral surface of the plastic inner layer.

Preferably, the width of the pipe wall reinforcing sheet is smaller than the winding pitch to form a spiral gap, the plastic protective layer is coated on the outer peripheral surface of the pipe wall reinforcing layer and connected to the plastic inner layer through the spiral gap, or the width of the pipe wall reinforcing sheet is larger than the winding pitch to form a spiral lap joint part.

Preferably, the extrusion widths of the plastic inner sheet and the plastic protective sheet are respectively greater than the pitches of the respective spiral paths to form a lap-joint spiral structure, and spiral lap joint directions of the plastic inner layer and the plastic protective layer are opposite to each other.

Preferably, the outer peripheral surface of the plastic protection layer is provided with a pipe reinforcement body, the pipe reinforcement body comprises a corrugated steel belt spirally wound on the outer peripheral surface of the plastic protection layer or a corrugated pipe coated with plastic, or the pipe reinforcement body is a flexible plastic section with a rectangular, omega-shaped and round section.

Preferably, the corrugated steel strip has a through hole extending therethrough and is provided with a plastic outer layer on an outer circumferential surface, the plastic outer layer being connected to the plastic protective layer through the through hole.

Preferably, the outer peripheral surface of the plastic inner layer is provided with a plurality of pipe wall reinforcing layers and a plurality of plastic protective layers which are alternately arranged in sequence, and each plastic protective layer is correspondingly coated on the outer peripheral surface of each pipe wall reinforcing layer.

Preferably, the reinforcing material of the pipe wall reinforcing sheet is at least one of glass fiber, polyester fiber, aramid fiber, steel wire or steel cord or a thin steel belt.

Preferably, the plastic inner layer is formed with at least two layers of the plastic inner sheet at any one axial position.

According to the technical scheme, the manufacturing equipment provided by the utility model can sequentially form the plastic inner layer, the pipe wall reinforcing layer and the plastic protective layer which extend along the spiral path or are spirally wound on the winding composite roller set through the plastic inner sheet extrusion unit, the pipe wall reinforcing sheet release unit and the plastic protective sheet extrusion unit, so that the multilayer reinforced composite pipe reinforced by the pipe wall reinforcing layer is manufactured. The reinforced composite pipe has high inner pressure resistance and outer pressure resistance (ring stiffness) by utilizing the pipe wall reinforcing layer, so that overhead construction or buried construction can be selected according to the requirement, and the reinforced composite pipe can be used as a fluid conveying carrier such as a gas conveying pipe, a pressure water supply pipe and the like.

The pipe layers of the reinforced composite pipe provided by the utility model are formed by extrusion to extend along a spiral path or spirally wind, so that the reinforced composite pipe can be suitable for actual production and can meet the production requirement of the reinforced composite pipe with large pipe diameter. In a preferred embodiment, the reinforced composite pipe may be manufactured such that the pipe wall reinforcing sheets forming the pipe wall reinforcing layer are spirally wound to form a spiral gap, so that the plastic protective layer can be reliably fused to the plastic inner layer through the spiral gap when the plastic protective layer is coated on the pipe wall reinforcing layer, which effectively ensures good bonding between the layers and integrity of the pipe in the pipe wall thickness direction, and can effectively avoid the problems of delamination and relative slippage between different pipe layers.

Drawings

FIG. 1 is an external structural view of a reinforced composite pipe according to a preferred embodiment of the present utility model;

FIG. 2 is a cross-sectional view of the tube wall of the reinforced composite tube taken along line A-A in FIG. 1;

FIG. 3 is a front view of a manufacturing apparatus for reinforcing composite tubes according to a preferred embodiment of the present utility model;

FIG. 4 is a top view of the apparatus for manufacturing reinforced composite tubes of FIG. 3, wherein each plastic extrusion die is visible;

FIG. 5 is a top view of the apparatus for manufacturing reinforced composite tubes of FIG. 3, schematically showing the inner plastic sheet, the protective plastic sheet and the outer plastic layer being extruded, and the wall reinforcing sheet and the corrugated steel strip being helically wound;

fig. 6 is a schematic view showing a process sequence of manufacturing the reinforced composite pipe shown in fig. 1 to 2 using the manufacturing apparatus shown in fig. 3 to 5;

FIG. 7 is a schematic diagram of the doctor blade and upper puck assembly of the manufacturing apparatus of FIG. 3 in the process sequence of FIG. 6;

FIG. 8 is a cross-sectional view of a tube wall of a reinforced composite tube according to another preferred embodiment of the present utility model;

FIG. 9 is a cross-sectional view of a tube wall of a reinforced composite tube according to yet another preferred embodiment of the present utility model;

FIG. 10 is a cross-sectional view of a tube wall of a reinforced composite tube according to yet another preferred embodiment of the present utility model;

FIG. 11 is a schematic process diagram of a doctor blade apparatus and upper puck assembly in a corresponding process sequence for a manufacturing apparatus according to another preferred embodiment of the present utility model; the method comprises the steps of,

FIG. 12 is a top view of a manufacturing apparatus for reinforced composite pipes according to another preferred embodiment of the present utility model, which can be used to manufacture the reinforced composite pipes shown in FIGS. 10 and 11;

FIG. 13 is an external structural view of a reinforced composite pipe according to another preferred embodiment of the present utility model;

FIG. 14 is a cross-sectional view of the wall of the reinforced composite pipe taken along line B-B in FIG. 13;

FIG. 15 is a cross-sectional view of a tube wall of a reinforced composite tube according to yet another preferred embodiment of the present utility model;

fig. 16 is a top view of a manufacturing apparatus for reinforced composite pipes according to another preferred embodiment of the present utility model, which can be used to manufacture the reinforced composite pipe shown in fig. 14.

Description of the reference numerals

1-winding a composite roller set; 11-upper roller; 12-a lower roller; 13-auxiliary rollers; 14-a sprocket; 2-a plastic inner sheet extruder set; a 21-plastic inner sheet extruder; 22-a plastic inner sheet extrusion die; 23-plastic inner sheets; 3-a tube wall reinforcing sheet releasing unit; 31-a reinforcing sheet tape-releasing device; 32-tube wall reinforcing sheets; 33-tension detecting means; 34-reinforcing sheet guiding means; 35-reinforcing sheet heating means; 4-a plastic protection sheet extruder set; 41-a plastic protective sheet extruder; 42-plastic protective sheet extrusion die; 43-plastic protective sheet; 5-a steel belt release molding unit; 51-a steel strip unreeling machine; 52-a tape splicing device; 53-a tape storage frame; 54-a cold roll forming device; 55-a steel belt bending machine; 6-a plastic outer layer extruder set; 61-a plastic outer layer extruder; 62-plastic outer layer extrusion die; storing the 5' -corrugated hose in a coating unit; 51' -bellows storage means; 52' -bellows delivery guide; a 53' -molten plastic extruder; 54' -molten plastic overmolding; 7-scraping and pressing device; 81-upper pinch roller assembly; 82-a lower pinch roller assembly; 83-supporting frames; 84-finishing wheel; 85-cutting machine; 86-placing the pipe rack; 10-reinforcing a composite tube; 20-a plastic inner layer; 20 a-an axially overlapping section; 30-a tube wall reinforcing layer; 30 a-helical gap; 30 b-spiral lap; 40-a plastic protective layer; 50-waveform steel strip; 60-a plastic outer layer; 50' -bellows; a 60' -plastic coating layer; 70' -rectangular section plastic profile.

Detailed Description

The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.

In the present utility model, unless otherwise specified, terms such as "upper, lower, left, and right" and "upper, lower, left, and right" are used generically to refer to the upper, lower, left, and right illustrated in the drawings; "inner and outer" means inner and outer relative to the contour of the respective parts themselves.

An aspect of the present utility model provides a method for manufacturing a multi-layer reinforced composite pipe reinforced with a reinforcing layer such as a steel strip, a fiber strip, which has the advantage of being resistant to internal pressure and external pressure, so as to be selectively constructed in an overhead or buried manner, and which can be used as a fluid transport carrier such as a gas transport pipe, a pressure water supply pipe, etc. in practical production. Fig. 3 to 5 show a manufacturing apparatus of a reinforced composite pipe according to a preferred embodiment of the present utility model, which can be used to manufacture the reinforced composite pipe 10 shown in fig. 1, 2, 8 or 9 in the process sequence shown in fig. 6. Fig. 12 shows a manufacturing apparatus of a reinforced composite pipe according to another preferred embodiment of the present utility model, which can be used to manufacture the reinforced composite pipe shown in fig. 10. The utility model also provides a method of manufacturing a reinforced composite pipe, which can be implemented by the manufacturing apparatus of the different embodiments described above. In order to better explain the manufacturing apparatus and the manufacturing method provided by the present utility model, different preferred embodiments of the reinforced composite pipe provided by the present utility model will be first described by way of example, and the manufacturing apparatus and the manufacturing method described above will be further described in connection with the structure of the reinforced composite pipe.

Reinforced composite pipe

Referring to fig. 1 and 2, a reinforced composite pipe 10 according to a preferred embodiment of the present utility model includes a plastic inner layer 20, a pipe wall reinforcing layer 30, and a plastic protective layer 40 sequentially disposed from the inside to the outside, wherein a fluid passage is defined in the plastic inner layer 20, and the fluid passage has a generally circular cross section to facilitate the transportation of various fluids.

The plastic inner layer 20 may be made of polyethylene, polypropylene, nylon material and formed into a substantially cylindrical pipe wall layer by a suitable manner, for example, by extruding the plastic inner sheet 23 onto the winding composite roll set 1 driven to rotate about a horizontal central axis by using the plastic inner sheet extruder set 2 in the manufacturing apparatus shown in fig. 3 to 5, whereby it may be formed such that a fluid passage defined by it has a large diameter (for example, 800mm or more).

The tube wall reinforcing layer 30 may be formed of a tube wall reinforcing sheet 32 such as a steel band, a fiber band, or the like spirally wound on the outer circumferential surface of the plastic inner layer 20, wherein the tube wall reinforcing sheet 32 may be selected to be a relatively soft material such as a glass fiber material impregnated with a resin, thereby facilitating the spiral winding process. In the manufacturing, the pipe wall reinforcing sheet 32 may be spirally wound on the outer peripheral surface of the plastic inner layer 20 by releasing the pipe wall reinforcing sheet 32 to the outer peripheral surface of the plastic inner layer 20 (simultaneously driven to move in the axial direction) rotating on the winding composite roller group 1 using the pipe wall reinforcing sheet releasing unit 3 in the manufacturing apparatus shown in fig. 3 to 5, whereby the pipe wall reinforcing layer 30 may be formed. In a reinforced composite pipe according to a preferred embodiment of the present utility model, as shown in fig. 2, pipe wall reinforcing sheets 32 are spirally wound so that the winding pitch thereof is larger than the width of the pipe wall reinforcing sheets 32, which can be achieved by controlling the rotational and axial moving speeds of the plastic inner layer 20 on the winding composite roll set 1, whereby spiral gaps 30a between the pipe wall reinforcing sheets 32 are formed in the formed pipe wall reinforcing layer 30, so that the previously formed plastic inner layer 20 is exposed outward through the spiral gaps 30 a.

The plastic protective layer 40 may be of the same material as the plastic inner layer 20 and is coated on the outer circumferential surface of the pipe wall reinforcing layer 30 by a suitable manner. For example, the plastic protective sheet 43 may be extruded onto the outer peripheral surface of the tube wall reinforcing layer 30 (while being driven to move in the axial direction with the plastic inner layer 20) rotating on the winding composite roller set 1 by using the plastic protective sheet extruder set 4 in the manufacturing apparatus shown in fig. 3 to 5. In the case where the pipe wall reinforcing layer 30 is formed to have the spiral gap 30a, the extruded plastic protective sheet 43 enters into the spiral gap 30a and bonds the formed plastic protective layer 40 to the outwardly exposed portion of the plastic inner layer 20 as one body. Thus, by reliably fusing the plastic inner layer 20 and the plastic protective layer 40, good bonding between the layers and integrity of the pipe in the thickness direction of the pipe wall can be effectively ensured, thereby effectively avoiding the problems of delamination and relative slippage between different pipe layers. Providing the plastic inner layer 20 and the plastic protective layer 40 to be made of the same material can facilitate not only reducing the material cost of manufacturing the reinforced composite pipe, but also facilitating good bonding thereof to each other.

As described above, the plastic inner layer 20 and the plastic protective layer 40 may be formed in an appropriate manner, respectively, and are not limited to the manner of extrusion using the plastic inner sheet extruder set 2 and the plastic protective sheet extruder set 4 in the manufacturing apparatus shown in fig. 3 to 5. In the above preferred embodiment of the present utility model, the plastic inner layer 20 and the plastic protective layer 40 are respectively made of the extruded plastic inner sheet 23 and the plastic protective sheet 43 extending along the spiral path, wherein the extrusion width of the plastic inner sheet 23 and the plastic protective sheet 43 may be greater than the pitch of their respective spiral paths, thereby forming a lap-type spiral structure. This not only facilitates the manufacture of large pipe diameter reinforced composite pipe by the manner described above, but also allows the plastic inner layer 20 and the plastic protective layer 40 to completely encapsulate the pipe wall reinforcing sheets 32 forming the pipe wall reinforcing layer 30 so as to maintain its reinforcing effect over a long period of use.

Further, the spiral lap directions of the plastic inner layer 20 and the plastic protective layer 40 are opposite to each other. In the left-to-right direction shown in fig. 2 (which can be considered as the outlet pipe direction in the manufacturing process, please refer to fig. 6 and 7), the plastic protection sheet 43 forming the plastic protection layer 40 is overlapped to the outer peripheral edge of the adjacent right-hand ring of plastic protection sheet 43, which can be achieved by: the plastic protecting sheet 43 is continuously extruded from the radially outer side onto the outer circumferential surface of the pipe wall reinforcing layer 30 as the pipe wall reinforcing layer 30 rotates and moves axially around the central axis of the winding composite roller set 1, wherein the rotational speed of the winding composite roller set 1 and the axial moving speed of the pipe wall reinforcing layer 30 determine the winding pitch of the plastic protecting sheet 43, which is smaller than the extrusion width of the plastic protecting sheet 43. Similarly, in the left-to-right direction shown in fig. 2, the plastic inner sheet 23 forming the plastic inner layer 20 is overlapped to the outer peripheral edge of its adjacent left-hand ring of plastic inner sheet 23, thereby reversing the spiral overlap direction of the plastic protective layer 40, which can be achieved by: the plastic inner sheet 23 is continuously extruded from the radially inner side to the winding composite roller set 1 while the plastic inner sheet 23 is driven to move in the axial direction, wherein the rotational speed of the winding composite roller set 1 and the axial moving speed of the plastic inner sheet 23 determine the winding pitch of the plastic inner sheet 23, which is smaller than the extrusion width of the plastic inner sheet 23. By this arrangement, it is not only convenient to arrange the relevant extrusion dies in the manufacturing apparatus, but also it is possible to ensure the overall strength of the reinforced composite pipe produced.

Fig. 8 shows a cross-sectional view of the wall of a reinforced composite pipe according to another preferred embodiment of the present utility model. The reinforced composite pipe has substantially the same structure and molding manner as the reinforced composite pipe shown in fig. 2 described above, except that the sheet width of the pipe wall reinforcing sheet 32 forming the pipe wall reinforcing layer 30 in the reinforced composite pipe is larger than the winding pitch at which it is spirally wound, whereby the spiral lap joint portion 30b is formed in the formed pipe wall reinforcing layer 30 so that the pipe wall reinforcing layer 30 entirely covers the outer circumferential surface of the plastic inner layer 20. The plastic inner layer 20 and the plastic protective layer 40 of the reinforced composite pipe are separated by the pipe wall reinforcing layer 30, and are relatively inferior in the joining property between the layers and the integrity in the pipe wall thickness direction as compared with the reinforced composite pipe shown in fig. 2, but can effectively secure the internal pressure resistance. Accordingly, the spiral wound structure of the pipe wall reinforcing layer 30 may be selected such that it has the aforementioned spiral gap 30a or spiral lap 30b according to the application scenario.

With continued reference to the reinforced composite pipe of the different preferred embodiments shown in fig. 2 and 8, the respective spiral overlap positions of the plastic inner layer 23 and the plastic protective layer 43 may overlap with the spiral gap 30a or the spiral overlap portion 30b in the pipe wall thickness direction of the reinforced composite pipe. The extrusion dies or release locations for forming the tube layers can thus be arranged in a helical path or helical winding pitch, which facilitates the production of reinforced composite tubes of different tube diameters by the same process in their manufacturing equipment and facilitates the construction of the tube reinforcement on the outer periphery by appropriate placement of the tube reinforcement as described later.

The reinforced composite pipe may be formed with different pipe wall thicknesses to meet the delivery of different pressure media. In a preferred embodiment of the present utility model, the pressure bearing capacity of the reinforced composite pipe may be reinforced by providing a pipe reinforcement on the outer peripheral surface of the plastic protective layer 40, which may be a metal wire or strip, typically surface coated or uncoated, or may be a nonmetallic composite. The tubular reinforcement may be formed in a variety of suitable configurations, such as by lap winding with flat steel strips, or may be rolled into any suitable shape, such as corrugated, portal, T-shaped, open trapezoidal or omega-shaped, etc. In the illustrated preferred embodiment, the tube reinforcement includes a corrugated steel strip 50 spirally wound around the outer circumferential surface of the plastic protective layer 40 such that the trough positions of the corrugated steel strip 50 correspond to the spiral lap positions of the plastic inner layer 20 and the plastic protective layer 40, respectively, and the spiral gap 30a or spiral lap portion 30b of the tube wall reinforcement layer 30. Therefore, the pipe reinforcement can effectively improve the axial tensile strength of the reinforced composite pipe. In other embodiments, the spiral lap locations of each of the plastic inner layer 20 and the plastic protective layer 40 and the spiral gap 30a or spiral lap portion 30b of the pipe wall reinforcing layer 30 may be located in other portions of the corrugated steel strip 50, such as the peak locations.

As previously described, the corrugated steel strip 50 may be surface coated, thereby avoiding or slowing down its corrosion in situations such as buried construction. For this purpose, the reinforced composite pipe of the present utility model may also be provided with a plastic outer layer 60 on the outer circumferential surface of the corrugated steel strip 50. In addition, the corrugated steel strip 50 may be formed with a through hole extending therethrough, through which the plastic outer layer 60 may be connected to the plastic protective layer 40 to ensure good engagement between the pipe reinforcement and the plastic protective layer 40 and integrity of the pipe in the thickness direction of the pipe wall, avoiding delamination and relative slippage between the different pipe layers.

Fig. 9 shows a cross-sectional view of the wall of a reinforced composite pipe according to yet another preferred embodiment of the present utility model. The reinforced composite pipe has substantially the same structure and molding manner as the reinforced composite pipe shown in fig. 8, except that: in the reinforced composite pipe shown in fig. 8, the plastic inner sheets 23 forming the plastic inner layer 20 overlap at adjacent portions of each turn, whereby there are two layers of plastic inner sheets 23 at adjacent portions and only a single layer of plastic inner sheets 23 at the remaining axial positions; in the reinforced composite pipe shown in fig. 9, the plastic inner sheets 23 forming the plastic inner layer 20 are not only overlapped at the adjacent portions of each turn, but also respectively overlapped at two adjacent sides of each turn, i.e., the two turns of the plastic inner sheets 23 at the two sides of the turn of the plastic inner sheets 23 have axially overlapped sections 20a, and three layers of the plastic inner sheets 23 are provided at the portions where the axially overlapped sections 20a are located, and two layers of the plastic inner sheets 23 are provided at the other portions. That is, the plastic inner layer 20 has at least two layers of plastic inner sheets at each axial location. In this way, for materials such as nylon that are not well heat fused, the overlap length in the plastic inner layer 20 can be effectively increased, thereby improving the fusion strength and ensuring the overall strength and reliability of the plastic inner layer 20.

Fig. 10 shows a cross-sectional view of the wall of a reinforced composite pipe according to yet another preferred embodiment of the present utility model. The reinforced composite pipe has substantially the same structure and molding manner as the reinforced composite pipe shown in fig. 2 described above, except that the reinforced composite pipe is provided with a plurality of pipe wall reinforcing layers 30 and a plurality of plastic protective layers 40 alternately arranged in this order on the outer peripheral surface of the plastic inner layer 20, which can be obtained by arranging a plurality of sets of pipe wall reinforcing sheet releasing units 3 and plastic protective sheet extruding units 4 in a manufacturing apparatus so as to be able to withstand greater inner and outer pressures. Wherein each plastic protection layer 40 is respectively coated on the outer peripheral surface of each layer of pipe wall reinforcement layer 30, and in the case that the pipe wall reinforcement layer 30 is formed with a spiral gap 30a, the innermost plastic protection layer 40 can be connected to the plastic inner layer 20 through the spiral gap 30a in the pipe wall reinforcement layer 30 on the inner side thereof; the plastic protective layer 40 of the other layer may be connected to the plastic protective layer 40 located inside the pipe wall reinforcing layer 30 through the spiral gap 30a in the pipe wall reinforcing layer 30 located inside thereof.

Fig. 13 to 14 show a reinforced composite pipe according to another preferred embodiment of the present utility model, which is different from the example shown in fig. 2 in that the reinforcing body of the pipe material on the outer circumferential surface of the plastic protective layer 40 is a corrugated pipe 50' coated with plastic. As described later in connection with the manufacturing apparatus shown in fig. 16, the bellows 50 'covered with the molten plastic may be released onto the outer peripheral surface of the plastic protective layer 40 by the bellows storage covering unit 5' to spirally weld the bellows 50 'formed with the plastic covering layer 60' onto the outer peripheral surface of the plastic protective layer 40.

Fig. 15 shows a reinforced composite pipe according to still another preferred embodiment of the present utility model, the pipe reinforcement of which is a rectangular-section plastic profile 70', the rectangular-section plastic profile 70' being spirally welded to the outer circumferential surface of the plastic protective layer 40. It will be appreciated that the tube reinforcement may also be provided as a flexible plastic profile having other cross-sectional shapes (e.g. omega-shaped, circular).

Apparatus and method for manufacturing reinforced composite pipe

Referring to fig. 3 to 5, the manufacturing apparatus of the reinforced composite pipe 10 according to a preferred embodiment of the present utility model can be used to manufacture the reinforced composite pipe shown in fig. 2, 8 or 9. The manufacturing apparatus includes a winding composite roll set 1, a plastic inner sheet extrusion unit 2, a tube wall reinforcing sheet release unit 3, a plastic protective sheet extrusion unit 4, and the like, so as to be able to be used to form a plastic inner layer 20, a tube wall reinforcing layer 30, and a plastic protective layer 40 extending along a spiral path or spirally wound (see fig. 6 and 7).

As a basic supporting unit in the shaping process of the reinforced composite pipe 10, the winding composite roller set 1 has a central axis adapted to the central axis of the pipe being manufactured and comprises a plurality of rollers arranged circumferentially around the central axis, such as the upper roller 11, the lower roller 12 and the auxiliary roller 13 in the illustrated preferred embodiment, which rollers provide an annular supporting circumferential surface for supporting the layers of the reinforced composite pipe, i.e. the sides of the respective rollers remote from said central axis are located substantially on the same cylindrical surface. Thus, by driving at least part of the rollers of the winding composite roller set 1 to spin and extruding or releasing each tube layer material onto the annular supporting peripheral surface formed thereby, a tube layer structure extending along a spiral path or spirally wound can be formed.

The individual rollers of the winding composite roller set 1 may have the same or different diameters. In the illustrated preferred embodiment, the winding composite roll set 1 includes upper and lower rolls 11 and 12 symmetrically disposed on and below a central axis thereof, and a plurality of auxiliary rolls 13 disposed circumferentially on both sides of the central axis, the auxiliary rolls 13 having a diameter smaller than the diameters of the upper and lower rolls 11 and 12. Thus, a relatively soft material forming the plastic inner layer 20, such as nylon, can be supported by the plurality of auxiliary rollers 13 uniformly arranged in the circumferential direction while applying a relatively large driving force to the plastic inner layer 20 and the like extruded thereto through the upper roller 11 and the lower roller 12 and providing a large composite contact surface. For this purpose, the upper roller 11 and the lower roller 12 are drivingly connected to a first driving means, the auxiliary roller 13 is drivingly connected to a second driving means, or the auxiliary roller 13 disposed at one side of the central axis is connected to the second driving means, and the auxiliary roller 13 disposed at the other side of the central axis is connected to a third driving means so as to be capable of being driven to rotate, respectively.

The respective rollers in the winding composite roller set 1 may be provided with their respective rotation axes and the central axis of the winding composite roller set 1 being different from each other so as to be able to apply an axial thrust force to the plastic inner layer 20 circumferentially supported on the winding composite roller set 1 when the rollers are driven to rotate. Thus, the two end plates on which the rollers are mounted can be relatively rotated by a certain angle so that the rotation axis of the rollers is not parallel to the central axis of the winding composite roller set 1, and thus the rollers can be driven to rotate the plastic inner layer 20 and other pipe layers on the outer peripheral surface thereof and also to move in the direction of the central axis (the pipe direction).

In the illustrated preferred embodiment, the ends of each auxiliary roller 13 are provided with chain wheels 14, which chain wheels 14 are interconnected to each other by means of a transmission chain, whereby the respective auxiliary rollers 13 are in driving connection with each other and driven to rotate in synchronism by the second drive means. Alternatively, the auxiliary rolls 13 located at the left sides of the upper and lower rolls 11 and 12 may be drivingly connected to the second driving means in this manner, and another part of the auxiliary rolls 13 located at the right sides of the upper and lower rolls 11 and 12 may be drivingly connected to the third driving means to individually drive the auxiliary rolls 13 at both sides to rotate.

In order to maintain the tube layers extruded onto the rollers at a suitable temperature, heating medium circulation channels may be provided in the rollers, whereby temperature control may be achieved by water flow, oil flow through the heating medium circulation channels. And/or an electric heating element such as a lamp tube or an electric heating rod can be arranged in the winding composite roller set 1 so as to control the temperature of the tube layer material in an electric heating mode.

The plastic inner sheet extruder set 2 is used to form a plastic inner layer 20 of the reinforced composite tube on the annular supporting circumferential surface of the winding composite roller set 1. The plastic inner sheet extruder set 2 has a plastic inner sheet extruder 21 and a plastic inner sheet extrusion die 22 disposed inside the winding composite roll set 1, such as disposed below the side of the upper roll 11, whereby the plastic inner sheet extruder 21 can extrude a plastic inner sheet 23 toward the upper roll 11 through the plastic inner sheet extrusion die 22. As the upper roller 11, the other auxiliary rollers 13, etc. are driven by rotation to move around the outer circumference of the winding composite roller set 1, the plastic inner sheet 23 extends along a spiral path around the winding composite roller set 1 and forms the plastic inner layer 20 circumferentially supported on the winding composite roller set 1. Fig. 3 and 4 show the arrangement position of the plastic inner sheet extrusion die 22 with respect to the winding composite roller set 1, wherein fig. 4 also shows the extension path P1 of the plastic inner sheet 23 on the winding composite roller set 1 after extrusion from the plastic inner sheet extrusion die 22, the extrusion position of which is located upstream (exit tube direction) of the pipe wall reinforcing sheet release position and the plastic protective sheet extrusion position described later. The helically extending structure of the plastic inner sheet 23 is schematically shown in fig. 5 in dash-dot lines. It should be appreciated that the plastic inner sheet extruder set 2 may have a plurality of plastic inner sheet extruders 21 and a corresponding plurality of plastic inner sheet extrusion dies 22 to extrude a plurality of plastic inner sheets 23 and to superpose and form the plastic inner layer 20, whereby the plastic inner layer 20 may be provided with a plurality of different functional layers by extruding the plastic inner sheets 23 of different materials, such as an abrasion resistant layer formed of an abrasion resistant material at the innermost layer adjacent to the fluid channel.

The tube wall reinforcing sheet releasing unit 3 is used to form a tube wall reinforcing layer 30 on the outer peripheral surface of the plastic inner layer 20. The pipe wall reinforcing sheet releasing unit 3 has a reinforcing sheet discharging device 31, and the reinforcing sheet discharging device 31 stores the pipe wall reinforcing sheet 32. The plastic inner layer 20 formed of the plastic inner sheet 23 is rotated on the winding composite roller set 1 due to the rotation of the roller and is moved in the axial direction thereof, and at this time, the tube wall reinforcing sheet 32 can be spirally wound on the outer peripheral surface of the plastic inner layer 20 by causing the reinforcing sheet discharging device 31 to discharge the tube wall reinforcing sheet 32 onto the outer peripheral surface of the plastic inner layer 20, thereby forming the tube wall reinforcing layer 30. Fig. 3 and 4 show the extending paths of the pipe wall reinforcing sheets 32 released by the pipe wall reinforcing sheet releasing unit 3 onto the outer peripheral surface of the plastic inner layer 20, wherein fig. 4 also shows the extending paths P2 of the pipe wall reinforcing sheets 32 after being released onto the plastic inner layer 20, the releasing positions of which are located downstream (in the pipe-out direction) of the extrusion positions of the plastic inner sheets 23. The path of extension of the tube wall reinforcing sheet 32 and the spiral extension on the outer peripheral surface of the plastic inner layer 20 are schematically shown in fig. 5 by dash-dot lines.

As described above, the rotational speed and the axial moving speed of the plastic inner layer 20 on the winding composite roll set 1 determine the winding pitch of the pipe wall reinforcing sheet 32, whereby the pipe wall reinforcing layer 30 can be formed to have the spiral gap 30a or the spiral lap 30b by winding the composite roll set 1. When the sheet width of the tube wall reinforcing sheet 32 is smaller than the winding pitch thereof, the tube wall reinforcing layer 30 is formed with a spiral gap 30a, and the plastic protective layer 40 formed later can be connected to the plastic inner layer 20 through the spiral gap 30 a; when the sheet width of the tube wall reinforcing sheet 32 is greater than the winding pitch thereof, the tube wall reinforcing layer 30 is formed with spiral lap portions 30b, and the plastic inner layer 20 and the plastic protective layer 40 formed later are separated by the tube wall reinforcing layer 30.

In order to ensure the winding quality of the pipe wall reinforcing layer 30 on the plastic inner layer 20, the tension, the entering angle, the temperature and the like of the pipe wall reinforcing layer need to be reasonably controlled. For this purpose, the tube wall reinforcing sheet release unit 3 may include a tension detecting means 33, a reinforcing sheet guiding means 34, and a reinforcing sheet heating means 35 arranged in this order along the release direction of the tube wall reinforcing sheet 32, the reinforcing sheet heating means 35 being provided to heat the tube wall reinforcing sheet 32 at a position close to the winding composite roller group 1. The reinforcing sheet heating means 35 may heat the pipe wall reinforcing sheet 32 in any suitable manner, such as it may be heated by blowing hot air to the pipe wall reinforcing sheet 32 so that the pipe wall reinforcing sheet 32 is better bonded to the outer peripheral surface of the plastic inner layer 20.

The plastic protective sheet extruder set 4 is used to form a plastic protective layer 40 on the outer peripheral surface of the pipe wall reinforcing layer 30. The plastic-protective-sheet extruder set 4 has a plastic-protective-sheet extruder 41 and a plastic-protective-sheet extrusion die 42 disposed outside the winding composite roll set 1, for example, disposed above the side of the upper roll 11, whereby the plastic-protective-sheet extruder 41 can extrude plastic protective sheets 43 through the plastic-protective-sheet extrusion die 42 toward the pipe-wall reinforcing layer 30 located on the upper roll 11. The plastic inner layer 20 and the pipe wall reinforcing layer 30 on the winding composite roll set 1 are rotated on the winding composite roll set 1 and axially moved along with the rotation of the upper roll 11, the other auxiliary rolls 13, etc., whereby the plastic protective sheet 43 extends along a spiral path around the winding composite roll set 1 and forms the plastic protective layer 40 around the pipe wall reinforcing layer 30. Fig. 3 and 4 show the arrangement position of the plastic protective sheet extrusion die 42 with respect to the winding composite roller group 1 and the plastic inner sheet extrusion die 22, wherein fig. 4 also shows the extension path of the plastic protective sheet 43 on the winding composite roller group 1 after extrusion from the plastic protective sheet extrusion die 42, which is wider than the released pipe wall reinforcing sheet 32 and extends along the extension path P2 of the pipe wall reinforcing sheet 32, so that the extrusion position thereof is located downstream (in the pipe-out direction) of the extrusion position of the plastic inner sheet 23 and above the feeding-in position of the pipe wall reinforcing sheet 32. The helically extending structure of the plastic protective sheet 43 is schematically shown in fig. 5 in dashed lines.

Further, the manufacturing apparatus of the reinforced composite pipe according to a preferred embodiment of the present utility model may further include a steel strip release molding unit 5 and a plastic outer layer extrusion unit 6 to be able to form a pipe reinforcement on the outer circumferential surface of the plastic protective layer 40. The composition and arrangement of the steel strip discharge forming unit 5 and the plastic outer layer extrusion unit 6 are exemplarily shown in fig. 3 to 5, wherein, for convenience of illustration, the conveying path of the corrugated steel strip 50 between the respective parts of the steel strip discharge forming unit 5 is shown in fig. 3 to 5 (and fig. 12) by a dash-dot line, but the steel strip unreeling machine 51, the taping device 52, the tape storage frame 53, the cold roll forming device 54, the steel strip bending machine 55, etc. should be arranged on the same line.

The steel strip release forming unit 5 is provided to be capable of releasing the waveform steel strip 50 onto the outer peripheral surface of the plastic protective layer 40 to spirally wind the waveform steel strip 50 onto the outer peripheral surface of the plastic protective layer 40; the plastic outer layer extruder unit 6 has a plastic outer layer extruder 61 and a plastic outer layer extrusion die 62, and can extrude and form a plastic outer layer 60 onto the outer peripheral surface of the corrugated steel strip 50 spirally wound on the plastic protective layer 40 through the plastic outer layer extrusion die 62.

Fig. 3 and 4 show the extending path of the corrugated steel strip 50 released from the steel strip releasing and forming unit 5 onto the outer peripheral surface of the plastic protective layer 40, wherein fig. 4 also shows the extending path P3 of the corrugated steel strip 50 after being released onto the plastic protective layer 40, the releasing position of which is located downstream (in the pipe-out direction) of the extrusion position of the plastic protective sheet 43. The release and extension path of the corrugated steel strip 50 is schematically shown in phantom in fig. 5.

Fig. 3 and 4 also show the arrangement positions of the plastic outer layer extrusion die 62 with respect to the winding composite roller group 1 and the plastic inner sheet extrusion die 22, the plastic protection sheet extrusion die 42, wherein fig. 4 also shows the extension path of the plastic outer layer 60 on the winding composite roller group 1 after extrusion from this plastic outer layer extrusion die 62, which extends along the extension path P3 of the corrugated steel strip 50, so that its extrusion position is located downstream (in the pipe direction) of the extrusion position of the plastic protection sheet 43 and above the feeding position of the corrugated steel strip 50. The helically extending structure of the plastic outer layer 60 is schematically shown in phantom in fig. 5. According to the illustrated preferred embodiment, the release position of the tube wall reinforcing sheet 32 and the extrusion position of the plastic protective sheet 43 may be located at a position where the plastic inner sheet 23 is extruded and spirally extends one revolution; the winding start position of the corrugated steel strip 50 and the extrusion position of the plastic outer layer 60 may be located at a position where the plastic inner sheet 23 is extruded and spirally extended for two weeks.

The manufacturing apparatus of the reinforced composite pipe of the present utility model may further include a finishing device for making good engagement of the pipe layers during the molding process. As shown in fig. 3 and 7, after the pipe wall reinforcing sheet 32 forming the pipe wall reinforcing layer 30 and the plastic protective sheet 43 forming the plastic protective layer 40 are laid on the plastic inner layer 20, the outer peripheral surface of the plastic protective layer 40 can be rolled or scraped by the doctor blade 7 provided above the winding composite roll set 1 (upper roll 11), thereby enabling the plastic inner layer 20, the pipe wall reinforcing layer 30 and the plastic protective layer 40 to be reliably joined and enabling the plastic protective layer 40 to have a substantially constant outer diameter so as to facilitate the subsequent laying of the pipe reinforcement. The doctor blade device 7 may be provided in the form of a press roll or a doctor blade. In addition, an upper press roller assembly 81 and a lower press roller assembly 82 may be installed through the supporting frame 83, and the upper press roller assembly 81 and the lower press roller assembly 82 are correspondingly disposed above the upper roller 11 and below the lower roller 12 for rolling the pipe reinforcement laid on the plastic protective layer 40, such as rolling the position corresponding to the trough of the corrugated steel strip 50 through the press rollers thereof, so that the pipe reinforcement is reliably coupled to the plastic protective layer 40.

Further, a finishing wheel 84 may be provided on the outer side of the winding composite roller group 1, and the finishing wheel 84 may finish the outer peripheral surface of the pipe reinforcement. At the exit end of the winding composite roller set 1, a cutter 85 for cutting a finished pipe having a predetermined length, a pipe rack 86 for storing the produced reinforced composite pipe 10, and the like may be provided.

Fig. 12 shows an apparatus for manufacturing a reinforced composite pipe according to another preferred embodiment of the present utility model, which is capable of manufacturing the reinforced composite pipe shown in fig. 10 by the process principle shown in fig. 11. The manufacturing apparatus is substantially the same as that of the above-described embodiment shown in fig. 3 to 5, except that two sets of pipe wall reinforcing sheet releasing units and two sets of plastic protective sheet extruding units are provided, and the reinforced composite pipe thus produced may have two pipe wall reinforcing layers 30 and two plastic protective layers 40 alternately arranged in order. In the manufacturing apparatus shown in fig. 12, a first pipe wall reinforcing sheet releasing unit 3a and a second pipe wall reinforcing sheet releasing unit 3a arranged in parallel are included, and the pipe wall reinforcing sheets released therefrom correspond to the plastic protective sheets extruded by the first plastic protective sheet extruding unit 4a and the second plastic protective sheet extruding unit 4b, respectively. Wherein the first plastic-protective-sheet extruder set 4a has a first plastic-protective-sheet extruder 41a and a first plastic-protective-sheet extrusion die 42a, the second plastic-protective-sheet extruder set 4b has a second plastic-protective-sheet extruder 41b and a second plastic-protective-sheet extrusion die 42b, and the second plastic-protective-sheet extrusion die 42b is arranged in parallel downstream (in the pipe-exit direction) of the first plastic-protective-sheet extrusion die 42a so that after the first-layer-pipe-wall reinforcing layer 30 and the plastic protective layer 40 are laid on the plastic inner layer 20 by the first-pipe-wall reinforcing-sheet releasing set 3a and the first plastic-protective-sheet extruder set 4a, the second-layer-pipe-wall reinforcing layer 30 and the plastic protective layer 40 are laid by the second-pipe-wall reinforcing-sheet releasing set 3b and the second plastic-protective-sheet extruder set 4 b.

Fig. 12 shows the arrangement positions of the plastic inner sheet extrusion die 22, the first plastic protective sheet extrusion die 42a, the second plastic protective sheet extrusion die 42b, and the plastic outer layer extrusion die 62 with respect to the winding composite roller set 1, and also shows the extending path P1 of the plastic inner sheet on the winding composite roller set 1, the extending path P21 of the first layer tube wall reinforcing layer and the plastic protective layer after being laid on the plastic inner layer, the extending path P22 of the second layer tube wall reinforcing layer and the plastic protective layer after being laid, and the extending path P3 of the corrugated steel strip 50 and the plastic outer layer after being released and extruded on the plastic protective layer of the outermost layer.

Referring to fig. 11, two sets of scraping means, namely, a first scraping means 7a and a second scraping means 7b, may be provided corresponding to the two-layer pipe wall reinforcing layer 30 and the plastic protective layer 40, wherein the first scraping means 7a may roll or scrape the outer circumferential surfaces of the first layer pipe wall reinforcing layer 30 and the plastic protective layer 40, and the second scraping means 7b may roll or scrape the outer circumferential surfaces of the second layer pipe wall reinforcing layer 30 and the plastic protective layer 40, thereby ensuring good pipe forming quality.

Fig. 16 shows a manufacturing apparatus of a reinforced composite pipe according to another preferred embodiment of the present utility model, which is capable of manufacturing the reinforced composite pipe shown in fig. 14. The manufacturing apparatus is substantially the same as that of the above-described embodiment shown in fig. 3 to 5, except that a corrugated tube storage cladding unit 5 'is used instead of the steel strip discharge molding unit 5 and the plastic outer layer extrusion unit 6 to spirally weld a pipe reinforcement formed of a corrugated tube 50' clad with molten plastic on the outer peripheral surface of the plastic protective layer 40. Specifically, the bellows storing and coating unit 5 'may include a bellows storing device 51' and a bellows conveying guide 52', the bellows storing device 51' storing the bellows 50', the bellows conveying guide 52' conveying and guiding the bellows 50 'to a corresponding position of the outer circumferential surface of the plastic protective layer 40 to spirally wind the bellows 50' on the outer circumferential surface of the plastic protective layer 40.

The bellows 50 'may also be coated with molten plastic using a molten plastic extruder 53' and a molten plastic coating die 54 'before the bellows 50' is transferred onto the outer peripheral surface of the plastic protective layer 40, so that the tube reinforcement has a plastic coating layer 60 'coated outside the bellows 50', thereby facilitating firm bonding to the outer peripheral surface of the plastic protective layer 40.

The present utility model also provides a method of manufacturing a reinforced composite pipe, which may be implemented, but is not limited to, using the above manufacturing apparatus, and which includes the steps of: s1, extruding a plastic inner sheet 23, so that the plastic inner sheet 23 extends along a spiral path and forms a plastic inner layer 20; s2, releasing the pipe wall reinforcing sheet 32 onto the outer peripheral surface of the plastic inner layer 20 so as to spirally wind the pipe wall reinforcing sheet 32 onto the outer peripheral surface of the plastic inner layer 20 to form a pipe wall reinforcing layer 30; and S3, extruding a plastic protection sheet 43 onto the outer peripheral surface of the pipe wall reinforcing layer 30, so that the plastic protection sheet 43 is coated on the outer peripheral surface of the pipe wall reinforcing layer 30 along a spiral path and forms a plastic protection layer 40. Wherein the tube wall reinforcing layer 30 may be formed to have a spiral gap 30a or a spiral lap 30b.

In order to form the pipe reinforcement, the manufacturing method may further include the steps of: s4, releasing the waveform steel belt 50 to the outer peripheral surface of the plastic protection layer 40 so as to spirally wind the waveform steel belt 50 on the outer peripheral surface of the plastic protection layer 40; s5, extruding and forming a plastic outer layer 60 on the outer peripheral surface of the corrugated steel strip 50 spirally wound on the plastic protective layer 40. Alternatively, the tube reinforcement may be a corrugated tube 50' coated with plastic or a flexible plastic profile having a rectangular, Ω -shaped, circular cross section, and for this purpose, the foregoing steps S4 and S5 may be respectively: releasing the bellows 50' onto the outer peripheral surface of the plastic protective layer 40; a plastic coating layer 60' is extruded onto the outer circumferential surface of the released bellows 50' and spirally welded to the outer circumferential surface of the plastic protective layer 40, thereby forming a tube reinforcement constructed of the plastic-coated bellows 50' on the outer circumferential surface of the plastic protective layer 40.

The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited thereto. Within the scope of the technical idea of the utility model, a number of simple variants of the technical solution of the utility model are possible, including combinations of individual specific technical features in any suitable way. The various possible combinations of the utility model are not described in detail in order to avoid unnecessary repetition. Such simple variations and combinations are likewise to be regarded as being within the scope of the present disclosure.

Claims (18)

1. An apparatus for manufacturing a reinforced composite pipe, comprising:

a winding composite roller group (1), the winding composite roller group (1) comprising a plurality of rollers arranged in a circumferential direction around a central axis to form an annular supporting circumferential surface, at least part of the rollers being capable of being driven to spin;

a plastic inner sheet extrusion unit (2), the plastic inner sheet extrusion unit (2) having at least one plastic inner sheet extruder (21) and at least one plastic inner sheet extrusion die (22) arranged inside the winding composite roller set (1), the plastic inner sheet extruder (21) being capable of extruding a plastic inner sheet (23) toward the roll through the plastic inner sheet extrusion die (22) so that the plastic inner sheet (23) spirally extends along the annular supporting circumferential surface along with rotation of the roll and forms a plastic inner layer (20) circumferentially supported on the winding composite roller set (1);

A pipe wall reinforcing sheet releasing unit (3), the pipe wall reinforcing sheet releasing unit (3) having a reinforcing sheet releasing device (31) and being configured to release a pipe wall reinforcing sheet (32) stored in the reinforcing sheet releasing device (31) onto an outer peripheral surface of the plastic inner layer (20) to place the pipe wall reinforcing sheet (32) onto the outer peripheral surface of the plastic inner layer (20) and to cause the pipe wall reinforcing sheet (32) to be spirally wound on the outer peripheral surface of the plastic inner layer (20) and form a pipe wall reinforcing layer (30) as the plastic inner layer (20) moves axially on the winding composite roller set (1); the method comprises the steps of,

the plastic protection sheet extrusion unit (4), the plastic protection sheet extrusion unit (4) is provided with a plastic protection sheet extruder (41) and a plastic protection sheet extrusion die (42) arranged outside the winding composite roller set (1), the plastic protection sheet extruder (41) can extrude a plastic protection sheet (43) onto the outer peripheral surface of the pipe wall reinforcing layer (30) through the plastic protection sheet extrusion die (42), so that the plastic protection sheet (43) is coated on the outer peripheral surface of the pipe wall reinforcing layer (30) and spirally extends to form a plastic protection layer (40).

2. Manufacturing plant for reinforced composite pipes according to claim 1, characterized in that a plurality of said rollers of said winding composite roller set (1) comprises an upper roller (11) and a lower roller (12) symmetrically arranged on and below said central axis and a plurality of auxiliary rollers (13) placed on both sides of said central axis along a circumference Xiang Bu and having a smaller diameter than said upper roller (11) and lower roller (12), wherein said upper roller (11) and lower roller (12) are drivingly connected to a first driving means, at least part of said auxiliary rollers (13) are drivingly connected to a second driving means, or at least part of said auxiliary rollers (13) arranged on one side of said central axis are drivingly connected to a second driving means, at least part of said auxiliary rollers (13) arranged on the other side of said central axis are drivingly connected to a third driving means, so as to be capable of being individually driven to rotate.

3. A manufacturing plant of reinforced composite pipes according to claim 2, characterized in that at least part of the ends of the auxiliary rollers (13) are provided with chain wheels (14) and are in transmission connection with each other by means of a transmission chain connected to the chain wheels (14) so as to be drivable in synchronous rotation by the second or third driving means.

4. The apparatus for manufacturing reinforced composite pipes according to claim 1, characterized in that the rotation axis of the drum and the central axis are different from each other so as to be able to axially move the inner plastic layer (20) circumferentially supported on the winding composite roller set (1) when the drum is driven to rotate.

5. A manufacturing apparatus of a reinforced composite pipe according to claim 1, wherein the plastic inner layer (20) circumferentially supported on the winding composite roll set (1) is driven by rotation of the drum to move in the axial direction while rotating around the central axis of the winding composite roll set (1), and the pipe wall reinforcing sheet (32) released by the pipe wall reinforcing sheet releasing unit (3) is spirally wound as:

the winding pitch is larger than the width of the pipe wall reinforcing sheet (32) to form a spiral gap (30 a) to allow the plastic protective layer (40) extruded by the plastic protective sheet extruder set (4) to be connected to the plastic inner layer (20) through the spiral gap (30 a), or,

The winding pitch is smaller than the width of the pipe wall reinforcing sheet (32) to form a spiral lap portion (30 b).

6. Manufacturing apparatus of reinforced composite pipe according to claim 1, characterized in that the pipe wall reinforcing sheet release unit (3) comprises tension detection means (33), reinforcing sheet guiding means (34) and reinforcing sheet heating means (35) arranged in sequence along the release direction of the pipe wall reinforcing sheet (32), which reinforcing sheet heating means (35) are arranged to heat the pipe wall reinforcing sheet (32) at a position close to the winding composite roll set (1).

7. The manufacturing apparatus of reinforced composite pipe according to claim 1, characterized in that it comprises at least two sets of said pipe wall reinforcing sheet release units (3) and at least two sets of said plastic protective sheet extrusion units (4).

8. The apparatus for manufacturing reinforced composite pipes according to claim 1, further comprising a scraping device (7) provided above the winding composite roller set (1), the scraping device (7) being arranged to be capable of rolling or scraping the outer circumferential surface of the plastic protective layer (40).

9. The apparatus for manufacturing a reinforced composite pipe of claim 1, further comprising:

A steel strip release molding unit (5), wherein the steel strip release molding unit (5) is configured to release a waveform steel strip (50) onto the outer peripheral surface of the plastic protective layer (40) so as to spirally wind the waveform steel strip (50) onto the outer peripheral surface of the plastic protective layer (40);

a plastic outer layer extrusion unit (6), wherein the plastic outer layer extrusion unit (6) is provided with a plastic outer layer extruder (61) and a plastic outer layer extrusion die (62), and can extrude and form a plastic outer layer (60) on the outer peripheral surface of the corrugated steel belt (50) spirally wound on the plastic protective layer (40) through the plastic outer layer extrusion die (62).

10. The apparatus for manufacturing a reinforced composite pipe of claim 9, further comprising at least one of:

a. an upper pinch roller assembly (81) and a lower pinch roller assembly (82), wherein the upper pinch roller assembly (81) and the lower pinch roller assembly (82) are arranged at the trough position of the corrugated steel belt (50) and are used for enabling the material extruded by the plastic outer layer extrusion die (62) to cling to the corrugated steel belt (50) so as to form the corrugated plastic outer layer (60);

b. a finishing wheel (84), wherein the finishing wheel (84) is arranged behind the plastic outer layer extrusion die (62) along the laying spiral direction of the waveform steel belt (50) and is used for finishing the minimum bending angle of the waveform steel belt (50) at the wave foot;

c. A sheet supporting device which is arranged behind the plastic inner sheet extrusion die (22) along the spiral direction of the plastic inner sheet (23) and is used for supporting the plastic inner sheet (23) in an auxiliary manner;

d. a heating medium circulation runner arranged in at least part of the rollers and/or an electric heating element arranged in the winding composite roller set (1).

11. The manufacturing apparatus of the reinforced composite pipe according to claim 1, further comprising a bellows storage cladding unit (5 '), the bellows storage cladding unit (5') being configured to release the bellows (50 ') clad with the molten plastic onto the outer peripheral surface of the plastic protective layer (40) to spirally wind and weld the bellows (50') onto the outer peripheral surface of the plastic protective layer (40).

12. The utility model provides a reinforcing composite pipe, includes plastic inlayer (20), pipe wall enhancement layer (30) and plastics protective layer (40) that set gradually from inside to outside, its characterized in that, be limited with fluid channel in plastics inlayer (20), just plastics inlayer (20) with plastics protective layer (40) are made by plastics inlayer (23) and plastics protective sheet (43) that are extruded spiral extension respectively, pipe wall enhancement layer (30) are made by pipe wall enhancement piece (32) on the outer peripheral face of plastics inlayer (20).

13. The reinforced composite pipe of claim 12, wherein the pipe wall reinforcing sheet (32) has a sheet width smaller than a winding pitch to form a spiral gap (30 a), the plastic protective layer (40) is coated on an outer circumferential surface of the pipe wall reinforcing layer (30) and connected to the plastic inner layer (20) through the spiral gap (30 a), or the pipe wall reinforcing sheet (32) has a sheet width larger than the winding pitch to form a spiral lap (30 b).

14. Reinforced composite pipe according to claim 13, wherein the extrusion width of the plastic inner sheet (23) and the plastic protective sheet (43) is respectively greater than the pitch of the respective spiral path to form a lap-joint spiral structure, the spiral lap-joint directions of the plastic inner layer (20) and the plastic protective layer (40) being opposite to each other.

15. The reinforced composite pipe according to claim 12, characterized in that the outer circumferential surface of the plastic protective layer (40) is provided with a pipe reinforcement comprising a corrugated steel strip (50) or a plastic-coated corrugated pipe (50') spirally wound on the outer circumferential surface of the plastic protective layer (40), or the pipe reinforcement is a flexible plastic profile having a rectangular, Ω -shaped, circular cross section.

16. Reinforced composite pipe according to claim 15, characterized in that the corrugated steel strip (50) has a through-going hole extending therethrough and is provided with a plastic outer layer (60) on the outer circumferential surface, which plastic outer layer (60) is connected to the plastic protective layer (40) through the through-going hole.

17. The reinforced composite pipe of claim 12, wherein a plurality of pipe wall reinforcing layers (30) and a plurality of plastic protective layers (40) are alternately arranged on the outer peripheral surface of the plastic inner layer (20), and each plastic protective layer (40) is correspondingly coated on the outer peripheral surface of each pipe wall reinforcing layer (30).

18. Reinforced composite pipe according to claim 12, wherein the plastic inner layer (20) is formed with at least two layers of the plastic inner sheet (23) at any axial position.

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