JP4994935B2 - Rubber hose with fittings - Google Patents

Description

  The present invention relates to a rubber hose with a fitting that is used, for example, for placing ready-mixed concrete.

  Generally, a rubber hose used for placing ready-mixed concrete is a rubber hose with a fitting having a structure in which a cylindrical fitting is fixed to an end of a hose body made of an elastomer such as resin or rubber.

  FIG. 6A shows a cross-sectional view of an example of a rubber hose with a fitting. This rubber hose 101 with a fitting has a structure in which a reinforcing fiber layer 103 and a spiral wire 104 are embedded in a hose body 102 and a fitting 105 is fixed to an end of the hose body 102. A stop ring 106 is formed on the outer peripheral surface of the metal fitting 105 so that a bead ring 107 is disposed on the tip side of the stop ring 106, and an end portion of the reinforcing fiber layer 103 is folded back so as to be hung on the bead ring 107. As a result, it is fixed to the end of the hose body 102.

  However, since the rubber hose 101 with the metal fittings hooks the end portion of the reinforcing fiber layer 103 of the hose body 102 on the bead ring 107 and firmly locks it, the hose body 102 is held by repeated pressure fluctuations of the fluid to be pumped. The rubber or the like and the metal fitting 105 are easily peeled off. Further, when the internal pressure exceeding the withstand pressure acts in the state where the peeling has progressed, the hose body 102 may be broken along the fracture surface 108 as shown in FIG.

  Further, as shown in FIG. 7, a structure in which the spiral wire 104 is disposed and locked to the tip side from the stop ring 106 is also employed, but due to a decrease in the adhesive force between the hose body 102 and the fitting 105. The spiral wire 104 easily gets over the stop ring 106, and its fastening force tends to be reduced.

On the other hand, as shown in FIG. 8, for example, Patent Document 1 includes a fitting that inserts a fitting 105 into the end of the hose body 102 and tightens it with an outer ring 109 from the outside of the hose body 102. A rubber hose 101 is disclosed. The rubber hose 101 with the metal fittings includes the hose body 102 and the hose body 102 until a desired fastening force is obtained by crimping the outer cylinder ring 109 disposed outside the hose body 102 and compressing the hose body 102 at a predetermined compression rate. The frictional force with the metal fitting 105 is increased.
Japanese Utility Model Publication No. 2005-180479 (paragraph number 0035, FIG. 1)

  However, the rubber hose with a metal fitting of Patent Document 1 takes time to caulk the outer cylinder ring, and it is desirable to consider the variation in the diameter of the hose body when caulking the outer cylinder ring. It is difficult to set the amount of caulking to obtain a fastening force.

  An object of the present invention is to provide a rubber hose with a fitting that can easily and reliably fasten the fitting, and a method for manufacturing the rubber hose with a fitting.

  In order to achieve the above-mentioned object, the rubber hose with a fitting according to the present invention has a cylindrical fitting fixed to the inner side of the end of the hose body, and restricts the diameter expansion of the end to the hose body. Then, a fastening cord for fastening the metal fitting is wound inside, and this fastening cord is integrated with the hose body during vulcanization molding.

  According to the above configuration, the end fitting of the hose body is restricted by winding the fastening cord and the fitting is fastened, so that it does not require time-consuming post-processing such as caulking of the outer ring. Can be. Further, even if the diameter of the hose body varies, the fastening cord can be wound according to the diameter, so that the expansion of the hose body is restricted by pressing the end of the hose body without causing a gap. be able to. Moreover, since the fastening cord is integrated with the hose body at the time of vulcanization molding, the fastening cord can be securely fastened by preventing the fastening cord from loosening without providing a special process.

  Here, steel cords and synthetic fiber cords can be used as fastening cords. Of these, by using steel cords or aramid fiber cords that are difficult to stretch, for example, the end of the hose body due to the action of internal pressure. The diameter expansion can be reliably controlled, which is particularly preferable. Moreover, the fastening cord can effectively regulate the diameter expansion of the end portion of the hose body by winding the cord in the radial direction, that is, in a direction substantially orthogonal to the hose central axis.

  The fastening cord may be wound so as to be exposed on the outer peripheral surface of the hose body, but since post-processing such as caulking is unnecessary, it can be embedded in the hose body to prevent damage. In this case, it is preferable to embed the fastening cord so as to cover the outer surface rubber that does not contribute to the pressure resistance of the rubber hose.

In addition, two layers of cylindrical reinforcing fiber layers are embedded in the hose body, and a stop ring that continuously protrudes in the circumferential direction is formed on the outer peripheral surface of the metal fitting to stop the reinforcing fiber layer on the inner peripheral side. The hook may be firmly fixed by hooking on the ring.

Specifically, the outer peripheral reinforcing fiber layer of the two layers is set to have a larger diameter than the outer diameter of the stop ring, the outer peripheral side of the outer peripheral reinforcing fiber layer , and the hose central axis more than the stop ring. In the direction of the direction, wrap the fastening cord around the tip side, and further, in the hose main body, in the hose central axis direction, at the tip side of the stop ring, the reinforcing fiber layer on the inner peripheral side of the two layers of the stop ring The diameter is set smaller than the outer diameter, and the diameter expansion is regulated by the fastening cord.

By doing so, the reinforcing fiber layer on the inner peripheral side is set to be smaller than the outer diameter of the stop ring on the tip side than the stop ring, and the expanded diameter is regulated by the fastening cord, so that the reinforcing fiber on the inner peripheral side The layer can be hooked from the tip side to the stop ring through an elastomer such as rubber. As a result, it is possible to prevent the fitting from coming off from the hose body and firmly fix it, and to increase the pressure resistance of the rubber hose with the fitting. In addition, since the fastening cord is integrated with the hose body, only the hose body does not come out leaving the fastening cord, and the fitting can be securely fastened.

Further, the outer peripheral side of the reinforcing fiber layer of the outer peripheral side, and by winding the second stop wearing cord proximal to the stop ring, Ru wrapped stop wearing codes on both sides of the stop ring in the hose axial direction. In this case, in the hose body, the reinforcing fiber layer on the inner peripheral side of the two layers is set to be smaller than the outer diameter of the stop ring at the both sides of the stop ring in the hose central axis direction, and is fastened. The cord regulates the diameter expansion of the reinforcing fiber layer on the inner peripheral side through the reinforcing fiber layer on the outer peripheral side .

  Then, it is possible to prevent the fitting from being pulled out from the hose body and to prevent the fitting from being pushed into the hose body. In addition, the diameter expansion can be regulated in a wider range, and separation between the hose body and the fitting can be more reliably prevented.

Between the two reinforcing cord layers of the hose body, a spiral wire that surrounds and reinforces the hose central axis in a spiral shape is embedded, and the outer side reinforcing fiber layer is attached by a cord for fastening the diameter of the spiral wire. Through the regulation. Thereby, it is possible to prevent the spiral wire from getting over the stop ring, and like the reinforcing fiber layer, the spiral wire can be hooked on the stop ring, and the fastening force of the fitting can be further increased.

Moreover, a 3rd fastening cord is wound so that a stop ring and the fastening cord of the both sides may be covered from an outer peripheral side.

Then, in addition to the above-described configuration in which the fastening cord is wound on both sides of the stop ring, the third fastening cord is wound, so that the fitting and the push-out of the fitting from the hose body are prevented, and the outer periphery of the stop ring The diameter expansion can be restricted in a wide range including the side, and the hose body and the fitting can be more reliably prevented from peeling off.

Further, to provide a method of manufacturing a cap member with a rubber hose formed by fastening a tubular cap member to the inside end portion of the hose body. Specifically, an unvulcanized rubber layer and a reinforcing fiber layer are laminated while an end is hung on the metal fitting to form a tubular laminate, and a fastening cord is wound around the end of the laminate, Vulcanized rubber is vulcanized. According to this structure, the same effect as the effect by employ | adopting the structure of said rubber hose with a metal fitting can be acquired.

  Furthermore, if a topping cord covered with unvulcanized rubber is wound as a fastening cord, the coated rubber becomes a non-slip, so that the fastening cord can be wound without loosening, and for example, twisted together As long as the covering rubber penetrates into the fixing cord itself, the fixing cord can be fitted into the hose body and reliably integrated.

  As described above, according to the present invention, the fastening cord is wound around the end portion of the hose body to regulate the diameter expansion, and the fastening cord is integrated with the hose body at the time of vulcanization molding. The cord is prevented from loosening. As a result, the fitting can be securely fixed, and even if the hose body diameter varies, it is easy to wrap the fastening cord according to the diameter. Wearing can be facilitated.

Hereinafter, the first reference embodiment to third referential embodiment for carrying out the cap member with Gomuho scan according to the present invention, for the first embodiment and the second embodiment will be described with reference to the drawings.

[First Reference Form]
FIG. 1 is a view showing a rubber hose with a fitting of a first reference embodiment, in which an upper half is a sectional view and a lower half is a side view.

  The rubber hose 1 with a metal fitting is used by being connected to the end of the transport pipe so that, for example, ready-mixed concrete is placed in a predetermined place. The structure is fixed.

  The hose body 2 has a tubular shape made of wear-resistant rubber, and is reinforced by embedding two cylindrical reinforcing fiber layers 4a and 4b and a spiral wire 5 spirally surrounding the hose central axis. Structured. A fastening cord 6 is wound around the end of the hose body 2 a plurality of times so as to form a single cord layer and be embedded on the outer peripheral side of the reinforcing fiber layers 4a, 4b and the spiral wire 5. The wear cord 6 is integrated with the end portion of the hose body 2 and the diameter of the hose body 2 is restricted, so that the end fitting 3 is fixed inside the end portion of the hose body 2.

  The fastening cord 6 is, for example, a steel cord that is difficult to stretch, and is wound in a radial direction, that is, a direction orthogonal to the hose central axis, to effectively restrict the diameter of the end portion of the hose body 2. In addition, although it can replace with a steel cord and can also use another cord as the fastening cord 6, when the cord which can be used and its elongation at break are illustrated, the steel cord is 1% -2%, the aramid fiber cord is Steel cord or aramid fiber cord that is 3% to 6%, nylon cord is 15% to 30%, polyester cord is 10% to 30%, is difficult to stretch, and can effectively regulate the expansion of the diameter of the hose body 2 Is preferable.

  The end fitting 3 is fixed to the hose body 2 so as to cover the proximal end side while exposing the distal end side of the outer peripheral surface thereof. A stop ring 7 that continuously protrudes in the circumferential direction is formed on the outer peripheral surface near the base end covered with the hose body 2. A stationary cord 6 is wound.

  The reinforcing fiber layer 4a on the inner peripheral side is set to be smaller in diameter than the outer diameter of the stop ring 7 at a position displaced from the stop ring 7, and is provided so as to get over the stop ring 7 in the direction of the hose central axis. Yes. Of the reinforcing fiber layer 4a, the diameter of the portion of the reinforcing fiber layer 4a on the tip side of the stop ring 7 is restricted by the fastening cord 6, so that the reinforcing fiber layer 4a is stopped via the rubber constituting the hose body 2. The ring 7 is caught from the tip side, and the fitting 3 is prevented from coming out of the hose body 2 and firmly fixed.

  The outer peripheral reinforcing fiber layer 4b is set to have a larger diameter than the outer diameter of the stop ring 7, and is provided so as to get over the stop ring 7 in the hose central axis direction, and through the reinforcing fiber layer 4b. The fastening cord 6 regulates the diameter expansion of the reinforcing fiber layer 4 a and the spiral wire 5.

  The spiral wire 5 is disposed between the reinforcing fiber layers 4 a and 4 b, and the winding diameter at the center of the wire is set smaller than the outer diameter of the stop ring 7. The spiral wire 5 is provided so as to straddle the stop ring 7 in the hose central axis direction, and the fastening cord 6 wound around the distal end side of the stop ring 7 presses the hose body 2 from the outer peripheral side. The diameter of the spiral wire 5 is prevented from expanding on the tip side from 7. As a result, the spiral wire 5 is caught on the stop ring 7 from the front end side through the rubber constituting the hose body 2, and is prevented from coming off from the hose body 2 and firmly fixed.

  Next, the manufacturing method of the rubber hose 1 with a metal fitting will be described. First, the fitting 3 is attached to the mandrel, and the unvulcanized rubber on the inner surface side, the reinforcing fiber layer 4a, the spiral wire 5 and the reinforcing fiber are provided around the mandrel while the end is hung on the base end side of the fitting 3. The layers 4b are sequentially laminated, and a topping cord formed by covering the fastening cord 6 with unvulcanized rubber is wound around the end portion thereof. Furthermore, after laminating the unvulcanized rubber on the outer surface side so as to cover the reinforcing fiber layer 4b and the fastening cord 6 over the entire length to form a tubular laminated body, the unvulcanized rubber of this laminated body is vulcanized. The rubber hose 1 with a mouth metal fitting is obtained by molding.

  According to the above configuration, by winding the fastening cord 6, the diameter of the end portion of the hose body 2 is restricted and the end fitting 3 is fastened, so that post-processing such as caulking is unnecessary. In addition, even if the diameter of the hose body 2 varies, the fastening cord 6 can be easily wound according to the diameter, so that the fitting 3 can be easily and reliably fastened. .

  Further, by winding the fastening cord 6, the reinforcing fiber layer 4 a on the inner peripheral side is hooked on the stop ring 7 from the tip side through the rubber constituting the hose body 2, so that the internal pressure applied to the rubber hose 1 with the fitting The end fitting 3 can be firmly fastened to withstand. Moreover, after the hose body 2 is molded around the mandrel and vulcanized, the fitting 3 is not displaced or separated when the hose body 2 is removed from the mandrel. Furthermore, since the fastening cord 6 is embedded in the hose body 2, it is possible to prevent only the hose body 2 from slipping out while leaving the fastening cord 6.

[Second Reference Form]
FIG. 2 is a view showing a rubber hose with a fitting of a second reference embodiment, and shows only the upper half of the cross-sectional view.

The rubber hose 8 with the metal fittings of the second reference form has substantially the same configuration as the rubber hose 1 with the metal fittings of the first reference form, but instead of wrapping the fastening cord 6 to form a single cord layer, This is a code layer. Since the number of layers is larger, the diameter expansion of the end portion of the hose body 2 can be more strongly regulated, and the pressure resistance of the rubber hose 8 with the fitting can be increased. Other configurations are the same as those of the first reference embodiment.

[Third Reference Form]
FIG. 3 is a view showing a rubber hose with a fitting of a third reference embodiment, and shows only the upper half of the sectional view.

The rubber hose 9 with a metal fitting of the third reference embodiment has substantially the same configuration as the rubber hose 8 with a metal fitting of the second reference embodiment, but instead of burying the fastening cord 6 in the end portion of the hose body 2, the fastening cord 6 6 is exposed on the outer peripheral surface of the hose body 2. Since the fastening cord 6 is wound as a topping cord, it is integrated with the hose body 2 when vulcanization molding is performed, so that loosening is prevented.

Since the rubber hose 9 with the metal fittings exposes the fastening cord 6, the laminated body can be molded in the same procedure as the conventional rubber hose until the unvulcanized rubber on the outer surface side is laminated. Other configurations are the same as those of the first reference embodiment.

First Embodiment
FIG. 4 is a view showing the rubber hose with a fitting according to the first embodiment of the present invention, and shows only the upper half of the sectional view.

The rubber hose 10 with a metal fitting of the first embodiment has substantially the same configuration as the rubber hose 1 with a metal fitting of the first reference embodiment, but in addition to the fastening cord 6 wound around the distal end side than the stop ring 7, The second fastening cord 11 is wound around the outer peripheral side of the reinforcing fiber layer 4b and the base end side of the stop ring 7.

  The fastening cord 11 has substantially the same effect as the fastening cord 6 on the distal end side, but restricts the pushing of the fitting 3 into the hose body 2 by being wound around the proximal end side rather than the stop ring 7. . Moreover, the diameter of the hose body 2 is restricted over a wide range by providing the fastening cord 11 in addition to the fastening cord 6, and the hose body 2 and the fitting 3 are more reliably prevented from peeling off.

Thereby, when placing the ready-mixed concrete, for example, even if the hose body 2 expands and contracts in the hose central axis direction due to fluctuations in its internal pressure, the hose body 2 and the fitting 3 are firmly attached, Sufficient durability can be obtained. Moreover, it is possible to prevent the fitting 3 from being displaced when it is removed from the mandrel after vulcanization molding without bonding the hose body 2 and the fitting 3. Other configurations are the same as those of the first reference embodiment.

[ Second Embodiment]
FIG. 5 is a view showing a rubber hose with a fitting according to a second embodiment of the present invention, and shows only the upper half of the cross-sectional view.

The rubber hose 12 with a metal fitting of the second embodiment has substantially the same configuration as the rubber hose 10 with a metal fitting of the first embodiment, but in addition to the fastening cords 6 and 11 provided on both sides of the stop ring 7, a fastening cord. 6 and 11 and the stop ring 7 are wound around the third fastening cord 13 so as to cover from the outer peripheral side.

The fastening cord 13 has substantially the same effect as the combination of the fastening cord 6 on the distal end side and the fastening cord 11 on the proximal end side, but in a wide range including the outer peripheral side of the stop ring 7. The diameter expansion of the hose body 2 can be restricted, and peeling between the hose body 2 and the fitting 3 can be more reliably prevented. In addition, the number of layers is increased by the provision of the fastening cord 13 in addition to the fastening cords 6 and 11, and the expansion of the diameter of the end of the hose body 2 is more strongly regulated, so that the pressure resistance of the rubber hose 12 with a fitting is improved. Can be increased. Other configurations are the same as those of the first embodiment.

It is a figure which shows the rubber hose with a metal fitting of a 1st reference form , an upper half is sectional drawing, a lower half is a side view It is a figure which shows the rubber hose with a metal fitting of 2nd reference form, and shows only the upper half of sectional drawing It is a figure which shows the rubber hose with a metal fitting of 3rd reference form, and shows only the upper half of sectional drawing It is a figure which shows the rubber hose with a metal fitting which concerns on 1st Embodiment of this invention, and shows only the upper half of sectional drawing. It is a figure which shows the rubber hose with a metal fitting which concerns on 2nd Embodiment of this invention, and shows only the upper half of sectional drawing. (A) is sectional drawing of the conventional rubber hose with a metal fitting, (b) is sectional drawing which shows the state which the rubber hose with a metal fitting fractured | ruptured Sectional view of another conventional rubber hose with fittings Sectional view of another conventional rubber hose with a fitting

1, 8, 9, 10, 12 Rubber hose with fittings 2 Hose body 3 Fittings 4a, 4b Reinforcing fiber layer 5 Spiral wires 6, 11, 13 Fastening cord 7 Stop ring

Claims (2)

It is a rubber hose with a mouth fitting formed by fastening a cylindrical mouth fitting inside the end of the hose body,
A two-layered cylindrical reinforcing fiber layer is embedded in the hose body, and a spiral wire that surrounds and reinforces the hose central axis spirally is embedded between the two reinforcing fiber layers. A stop ring protruding continuously in the circumferential direction is formed on the outer peripheral surface, and the reinforcing fiber layer on the outer peripheral side of the two layers is set to have a larger diameter than the outer diameter of the stop ring,
On the outer peripheral side of the reinforcing fiber layer on the outer peripheral side, a fastening cord for restricting the diameter expansion of the end portion of the hose body and fastening the fitting on the inside is wound,
The fastening cord is wound around the distal end side in the hose central axis direction from the stop ring, and the second fastening cord is wound around the proximal end side from the stop ring, so that the stop ring Wound on both sides, integrated with the hose body during vulcanization molding and embedded in the hose body ,
Of the hose body, the both sides of the stop ring in the hose central axis direction are set such that the inner peripheral reinforcing fiber layer of the two layers is smaller in diameter than the outer diameter of the stop ring, and the fastening A rubber hose with a mouth metal fitting, wherein the diameter of the reinforcing fiber layer on the inner peripheral side and the spiral wire is restricted by the cord through the reinforcing fiber layer on the outer peripheral side . The rubber hose with a clasp according to claim 1, wherein a third fastening cord is wound so as to cover the stop ring and the fastening cords on both sides thereof from the outer peripheral side.

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