JPH032795Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a reinforcing wire used for delivery of various fluids such as gases, liquids, various slurries, powders, etc., or for suction and suction/delivery common use. The present invention relates to a hose with a bandless expandable fitting, in which a fitting fitting is expanded and airtightly set on a portion of a rubber hose cut at an arbitrary length.

[Conventional technology]

Conventionally, methods for fixing hose fittings include a band tightening type in which the outer circumference of the hose at the hose fitting insertion part is tightened with a tightening fitting, and a cylindrical fitting is inserted into the outer circumference of the hose and squeezed to tighten it evenly. There is a squeeze type that performs pressure tightening, and a hose expansion type where the outer cylindrical fitting is inserted into the outer periphery of the hose, and the inner cylindrical fitting is forcefully inserted to expand the hose and there is no step between the inner cylindrical fitting and the hose inner surface. Special Publication No. 59-16928)
The above hoses are classified into a band type in which a fixing fitting is provided on the outer periphery of the hose, and a bandless type in which the hose and a fitting mouthpiece are fixed by vulcanization adhesive.

As mentioned above, the fixing of the joint cap requires a band type that is tightened from the outer circumference of the hose, except for vulcanization adhesive. Without a band, the contact stress between the cap and the hose will be attenuated and the sealing performance will be poor. It is not retained. Therefore, for hoses with spiral reinforcing wires, for a long time, a cap insertion part with a large inner diameter without the spiral reinforcing wire was formed at both ends to create a cap with no step between the inner surface of the cap and the inner surface of the hose. is inserted and secured with a tightening band.

[Problem that the invention attempts to solve]

As mentioned above, even if a hose with a spiral reinforcing wire is tightened on the reinforcing wire, an airtight seal cannot be obtained at the contact seal between the outer surface of the mouthpiece and the rubber, and if the hose is tightened too strongly, the spiral reinforcing wire will deform and become defective. state. Therefore, for a long time, each hose used has been provided with a cap insertion portion made of rubber and a fiber reinforcing layer without reinforcing wires at both ends.

Forming a cap insertion part for each hose of such a usable length would result in individual production of a wide variety of products in small numbers based on individual orders, which is not desirable as a production method, and also increases the number of processing steps and increases production costs. Become. Therefore, there is a need for a structure in which a fitting cap can be fixed to a section of a reinforcing wire-containing hose cut to an arbitrary length, without requiring a cap insertion portion without a reinforcing wire.

Note that the cross-sectional shape of the fixing portion of the base of a conventional hose is such that a ring-shaped serrated protrusion for preventing the hose from coming off is formed. Therefore, when inserting and fixing a vulcanized rubber hose into a mouthpiece, the ring-shaped protrusion (locking pawl) bites into the vulcanized inner rubber to seal and fix it.

Therefore, such conventional fixing methods require a stress that sufficiently suppresses the deformation and movement of the filled rubber due to biting.
Alternatively, in the case of internal expansion of the mouthpiece, unless the outer cylindrical fitting is fixed or the filling rubber is contained, the sealing stress of the filling rubber due to the protrusion biting will cause a viscoelastic property with creep (CREEP) property and plasticity. This appears as a reduction in sealing stress due to plastic deformation and creep properties, which are characteristics of the rubber body. Therefore, it is necessary to hold it down and contain it.

Therefore, with the conventional structure of ring-shaped serrated retaining protrusions, it is impossible to do so without a holding force, and especially in hoses that require a helical reinforcing wire, it is impossible to remove the helical reinforcing wire. Since the ring-shaped protrusion intersects with the ring-shaped protrusion, it becomes a hindrance to uniform pressing force.

In addition, if an outer cylindrical fitting is not fixed to the outer periphery of the base insertion part, which does not require a reinforcing wire, to suppress deformation,
In a viscoelastic body having plasticity such as a rubber-like elastic body, a creep phenomenon occurs in which stress attenuates due to deformation over time.
Therefore, all conventional methods of inserting and fixing the cap of a vulcanized hose require an outer cylindrical fitting (band, etc.), and without the outer cylindrical fitting, the tightening force will be insufficient. However, setting the outer cylindrical fittings (bands, etc.) on the mouthpiece obstructs the handling of the hose, and not only increases the weight and outer diameter of the mouthpiece, but also increases the outer diameter of the outer cylindrical metal fitting. This causes damage and aging of the rubber at the end of the tightening part.

Therefore, even in the case of a normal joint setting with a fixed cap insertion type, it is preferable to set it to a smooth bandless method similar to a vulcanized adhesive bandless hose, so the inventors This paper explores the structure of a bandless hose that is effective and suppresses deformation of the reinforcing wire. In addition, especially for transferring abrasive materials such as slurry and powder, it is necessary to configure the inner surface of the cylindrical portion of the joint cap and the inner surface of the hose to be on the same level without any difference in level.

In other words, this invention has the advantage of configuring the inner surface of the cylindrical part of the joint base and the inner surface of the hose to be on the same level, and that the cut portion of the hose with the spiral reinforcing wire has the reinforcing wire cut to an arbitrary length. , which attempts to solve problems such as setting a fitting cap and maintaining sealing performance for a long period of time by eliminating the tightening band.

[Means for solving problems]

The hose of this invention is a reinforcing wire hose used for delivery, suction, suction/delivery, etc., so the basic structure of the hose for such uses is inner rubber, inner fiber reinforcement layer, intermediate rubber, It is formed from a combination of spiral reinforcing wire, outer fiber reinforcing layer, outer rubber, etc. In this hose with spiral reinforcing wire, we have abolished the conventional configuration of the base insertion part consisting of a fiber reinforcement layer and rubber that does not require reinforcing wire, and can be used in a section cut at any length of the hose with spiral reinforcing wire. By inserting and fixing the cylindrical part of the joint cap, plastic deformation is suppressed without using an outer cylindrical fitting (band, etc.) for tightening, and the contact area between the cylindrical part of the cap and the inner rubber is improved. It has a bandless configuration that does not require any fasteners such as bands to maintain sealing performance.

That is, in order to obtain a sealing property at the contact area between the outer surface of the cylindrical part of the fitting mouthpiece and the inner rubber, the cut end of the hose with a spiral reinforcing wire is
This involves inserting the cylindrical part of the fitting cap, which has an outer diameter slightly smaller than the inner diameter of the hose, and expanding its inner diameter to fix the inner surface of the cylindrical part and the inner surface of the hose to the same level. In order to absorb the stress and obtain effective sealing deformation and retention of the inner rubber, which is a viscoelastic body, a spiral protrusion is provided on the outer periphery of the cylindrical part of the joint cap, and a spiral reinforcement wire of the hose is used. The hose is formed at the same pitch as the hose, and when inserted into the end of the hose, the spiral protrusion is arranged and expanded to be fixed so as to correspond to the valley between the pitches of the spiral reinforcement wire of the hose. It is.

In addition, when expanding and fixing this spiral protrusion,
Support the hose with a support fitting that has an inside diameter slightly larger than the outside diameter of the hose, and use an expansion device to expand the cylindrical part of the fitting mouthpiece so that the helical protrusion is in the trough of the spiral reinforcing wire. , the reinforcing wire is fixed so that it fully bites into the inner rubber of the hose, and the reinforcing wire maintains its rigidity and elastic limit without deforming, and the plastic deformation due to expansion is always suppressed by the stiffness and elasticity of the reinforcing wire on the fiber reinforcement layer. It functions well and provides a good seal.

Therefore, after fixing, the supporting metal fittings are unnecessary and can be removed and used without a band. That is, as configured above, a hose with a cap for a bandless expandable joint that does not require a conventional band is formed. Note that the detailed configuration will be described later based on the drawings of the embodiment.

[Effect]

As described above, the helical protrusion formed on the outer periphery of the cylindrical part of the fitting cap and having the same pitch as the helical reinforcing wire of the hose sufficiently bites into the inner rubber of the hose at the trough of the reinforcing wire and is sealed. Due to the rigidity and elasticity of the spiral reinforcing wire on the fiber reinforced layer, the sealing state caused by the deformation functions as if it were a conventional tightening band, preventing plastic deformation of the part made of rubber and fiber reinforced layer. A good sealing effect can be obtained.

In addition, in order to insert and fix the joint cap into the hose with the spiral reinforcing wire, the reinforcing wire continuously reinforces the hose from the outer periphery of the cap. Due to the smooth operation of the joint, no local stress is applied to the vicinity of the joint, eliminating the cause of local damage and ensuring a good condition for a long period of time.

〔Example〕

FIG. 1 is a partial front view showing a partial cross section of an example of a hose used in this invention, and is an example of a hose with an inner diameter of 101.6 mm.

In the figure, 1 is inner rubber (thickness 4 mm in this example),
2 is an inner fiber reinforcing layer (in this example, 2 plies of polyester cord, cord diameter 1 mmφ, used as a crossed cord angle of 54 degrees), 3 is intermediate rubber (thickness 4 mm),
4 is a spiral reinforcement wire (in this example, hard steel wire 4φ, pitch 12
mm), 5 is the outer fiber reinforcement layer (this example is 2 ply polyester cord, cord diameter 1 mmφ, cord angle 54
6 is the outer rubber (thickness 2 mm in this example).

FIG. 2 is a front view of an exemplary joint base.

In the figure, 7 is a joint base, 7a is a flange, 7b is a cylindrical portion, 7c is a spiral projection, Pm is the pitch of the spiral projection, and D is the outer diameter of the spiral projection 7c.

FIG. 3 is a front view of the hose joint portion, partially in cross section, showing a state in which the cylindrical portion of the joint mouthpiece is inserted into the cut end of the hose with spiral reinforcing wire.

In this invention, as shown in the figure, Pw is the pitch of the spiral reinforcement wire, and the spiral protrusion 7c of the cylindrical portion 7b of the joint base 7 corresponds to the trough of the pitch Pw of the spiral reinforcement wire 4. It should be arranged as follows.

FIG. 4 is a front view showing a partial cross section of the joint part of the hose with a cap for a bandless expandable joint of this invention, in which the cylindrical part 7b of FIG. 3 is enlarged and the spiral reinforcement wire 4 of the hose is This figure shows a state in which the spiral protrusion 7c is sufficiently bitten into the inner rubber 1 and fixed at the trough of the pitch Pw. The inner diameter of the cylindrical portion 7b of the joint base in this embodiment after expansion is
The diameter was 101.4mmφ, and the outer diameter was 109mmφ.

The flange portion 7 of the hose in the embodiment shown in FIG. 1 above.
As a result of attaching a blind flange to a and applying water pressure,
No abnormality was observed even at 10Kg/cm ² . No abnormality occurred at a negative pressure of 720 mmHg.

In addition, the rubber used in each part of this hose is
A material having appropriate physical properties corresponding to the fluid to be used is appropriately selected from natural rubber, synthetic rubber, and other elastic polymeric materials having rubber-like elasticity. Further, the fiber reinforcing layer may be made of various structures such as woven fabric or cord fabric arbitrarily selected from various types of natural fibers and artificial fibers depending on the conditions of use. Further, a reinforcing layer may be formed by using a woven fabric and a cord in combination. Further, the number of plies is not limited to the embodiments, and various combinations are possible.

The hose of this invented method shown in the above example is normally suitable for use in medium-pressure feeding with medium-diameter hoses of 50 to 125φ, but it is also suitable for use in suction hoses with larger diameters of about 150 to 200φ. The features of bandless ease of use are demonstrated,
be used effectively.

In addition, if higher pressure is required, a rubber layer and a spiral reinforcing wire are further set on the outer fiber reinforcing layer of the above example above the troughs of the inner spiral reinforcing wire, and further, It is also conceivable to form a fiber-reinforced layer and a top rubber to form a hose with a double-reinforced wire structure.

[Effect of idea]

The hose of this invention does not require any tightening fittings on the outside of the joint, so the outer diameter of the joint is small and lightweight.
It is easy to handle and use, and exhibits good workability effects. In addition, since there is no need for external tightening operation,
The durability of the outer surface of the joint is maintained, and there is no need to manufacture fastening fittings, which is economically advantageous. Also,
Unlike conventional spout structures without reinforcing wires, the spiral reinforcing wire is continuously provided over the entire length of the hose from the top of the fitting mouthpiece.The reinforcing effect reduces tension on the hose when the hose is in use. During bending during operation or direction change, unreasonable local stress that can cause damage is applied to the hose at the tip of the cylindrical part of the ferrule inserted into the hose.
A suitable hose condition is maintained for a long period of time, resulting in excellent durability. Furthermore, since there is no need to make the opening of the hose end a separate structure without reinforcing wires, manufacturing costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a partial front view showing a partial cross section of an exemplary hose used in this invention, FIG. 2 is a front view of an exemplary joint base used in this invention, and FIG. FIG. 4 is a front view showing a partial cross section of the hose joint when the joint mouthpiece is inserted, and FIG. be. 1... Inner surface rubber, 2... Inner fiber reinforcement layer, 3...
... intermediate rubber, 4 ... spiral reinforcement wire, 5 ... outer fiber reinforcement layer, 6 ... outer rubber, 7 ... joint base,
7b...Cylindrical part, 7c...Spiral projection part, Pm...
...Pitch of the helical protrusion, D...Outer diameter of the cylindrical part of the fitting cap, Pw...Pitch of the helical reinforcing wire.

Claims (1)

[Claims for Utility Model Registration] (1) Inserting the cylindrical part of a fitting cap having an outer diameter slightly smaller than the inner diameter of the hose into the cut part of a hose with a spiral reinforcing wire, The spiral protrusion provided on the outer periphery of the tube is arranged so as to correspond to the valley between the pitches of the spiral reinforcing wire of the hose of the same pitch, and the inner surface of the cylindrical portion and the inner surface of the hose are on the same level. 1. A hose with a cap for a bandless expandable joint, characterized in that the outer periphery of the joint part is made into a bandless structure by means of expanding and fixing the inner diameter of the cylindrical part. (2) Bandless according to claim 1, in which the hose with spiral reinforcing wire comprises an inner rubber, an inner fiber reinforcing layer, an intermediate rubber, a spiral reinforcing wire, an outer fiber reinforcing layer, an outer rubber, etc. Hose with expandable fitting clasp.