JPH0353517B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing rubber pipes, and more particularly, to rubber pipes used for marine pipelines such as dredging work and offshore oil transportation work. The present invention relates to a manufacturing method.

[Conventional technology]

First, the structure of a conventional example will be explained with reference to FIG. A joint member 4 is fixed to the portion. The joint member 4 has an L-shaped cross section, and includes a flange portion 5 that is bolted to an iron pipe (not shown), etc., and a nipple portion 6 that extends relatively long from the inner end of the flange portion 5 into the rubber tube body 2. A ring-shaped metal fitting is used. Also, regarding the manufacturing method of such a rubber tube, first, the end of the reinforcing cloth 3a of the inner layer is fastened to the nipple part 6 with the first locking wire 7, and then this end is bent and pressed. Press the reinforcing cloth 3b with a roller or the like, and then press the end of the outer reinforcing cloth 3b with a second
It is folded back around the locking wire 8 and crimped in the same manner as described above.

[Problem to be solved by the invention]

However, the configuration described above has the disadvantage that the nipple portion 6 reduces the effective bending length of the rubber tube main body 2 and increases the overall weight of the rubber tube 1. In addition, the manufacturing method requires two cumbersome steps: bending and crimping the ends of the inner layer reinforcing cloth 3a and then bending and crimping the outer layer reinforcing cloth 3b to the nipple portion 6, which is inefficient. Ta.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for manufacturing a rubber tube that can improve the conventional structural defects as described above, and that can firmly attach a joint member to a rubber tube body through a simple process. .

[Means for Solving the Problems] The method for manufacturing a rubber tube of the present invention includes a step of forming an inner layer rubber by winding unvulcanized rubber on a mandrel, and a step of wrapping a reinforcing cloth around the outer peripheral surface of the inner layer rubber. , a step of fitting a locking ring onto the reinforcing cloth, folding the end of the reinforcing cloth around the locking ring, and attaching a washer-like hard metal flange plate to the outer periphery of the folded portion of the reinforcing cloth. a step of wrapping unvulcanized rubber around the outer periphery of the reinforcing cloth to form an outer rubber layer, and a step of fitting a partially open metal locking member to the inner diameter end of the hard flange plate. a step of tightening this locking member so that its inner diameter is substantially smaller than the outside diameter of the locking ring, and then welding and fixing it to a hard flange plate; and a step of wrapping the outer peripheral surface of the outer layer rubber with cloth tape. The method is characterized in that it includes a step of vulcanization molding.

[Effect]

A locking ring is fitted onto the reinforcing cloth on the outer peripheral surface of the inner layer rubber, the end of the reinforcing cloth is folded back around the locking ring, and a washer-like hard flange plate is fitted around the outer periphery of the folded portion of the reinforcing cloth. After the outer layer of rubber is formed on the outer periphery of the reinforcing cloth, a partially open locking member is fitted to the inner diameter end of the hard flange plate so that its inner diameter is substantially smaller than the outer diameter of the locking ring. The coupling member can be firmly fixed to the end of the rubber tube body by a simple process of tightening it as shown and then welding it to the locking ring.It is also a lightweight rubber with a larger effective bending length than conventional rubber tubes. tubes can be provided. Since the hard flange plate and the locking member are made of metal, they can be securely fixed together by a simple method such as welding, and the reinforcing cloth folded around the locking ring can be firmly attached to the center of the hard flange plate. It can be fixed within the hole. Furthermore, since the locking member is one whose inner diameter can be reduced by tightening, the locking member can be used even if the outer diameter of the rubber tube body is slightly different by adjusting the degree of tightening. In addition, on the peripheral surface of the center hole of the hard flange plate,
The reinforcing fabric is fitted in such a way as to hold down the folded part, so if you want to change the thickness of the reinforcing fabric or the thickness of the locking ring, all you have to do is change the size of the center hole of the hard flange plate. It is also possible to easily adapt to changes in the thickness of the reinforcing cloth and the thickness of the locking ring.

〔Example〕

Hereinafter, this invention will be explained in detail with reference to an example of a rubber tube made by this method.

FIG. 2 shows an example of a rubber tube made by this method, and this rubber tube 10 includes a rubber tube body 11 and a metal coupling member 12 attached at its end. Although FIG. 2 only shows one end of the rubber tube 10, a similar joint member is provided at the other end. One or more layers of reinforcing cloth 13 are embedded within the rubber tube body 11. This reinforcing cloth 13 may be a so-called rubberized cloth coated with rubber. The joint member 12 includes a locking ring 14 for folding the end of the reinforcing cloth 13 inward in the axial direction of the rubber tube 10 at the end of the rubber tube body 11, as shown in FIG. The washer-like flange plate 15 is fitted around the reinforcing cloth 13, and is welded and fixed to the peripheral edge 15a of the center hole inside the flange plate 15. A locking member 16 is provided. The locking ring 14 is composed of a wire ring, a steel ring, a hard plastic ring, or the like. The locking member 16 is composed of a C-shaped metal rod, for example, as shown in FIG.
This locking member 16 is fitted into the rubber tube main body 11,
Thereafter, the hard flange plate 15 is tightened by a tightening device (not shown) so that its inner diameter is smaller than the outer diameter of the locking ring 14.
It is welded and fixed near the peripheral edge 15a of the center hole.
An appropriate number of bolt through holes 17 are provided in the flange plate 15.
is drilled.

In this joint member 12, a locking member 16 having an inner diameter substantially smaller than the outer diameter of the locking ring 14 is fixed by welding near the peripheral edge 15a of the center hole on the inner peripheral surface of the hard flange plate 15. Therefore, this locking member 16 acts as a stopper and the reinforcing cloth 13 does not come off from the locking ring 14.

A method of manufacturing the rubber tube 10 configured as described above will be described next. First, unvulcanized rubber is wound around a mandrel (not shown) to form the inner layer rubber 11a of the rubber tube body 11, and the reinforcing cloth 13 is wound and laminated around the outer peripheral surface of the inner layer rubber 11a. Next, the locking ring 14 is fitted onto the reinforcing cloth 13, and
The end of the reinforcing cloth 13 is wrapped around this locking ring 14 and folded back. Then, unvulcanized rubber is wrapped around the reinforcing cloth 13 to form the outer layer rubber 11b of the rubber tube body 11.
A locking member 16 is fitted to the outer circumferential surface of the outer rubber layer 11b, and a hard flange plate 15 is fitted so as to be positioned on the folded portion of the reinforcing cloth 13. Thereafter, the locking member 16 is compressed by a tightening device (not shown) so that its inner diameter becomes smaller than the outer diameter of the locking ring 14, and the hard flange plate 1 is compressed.
Welding and fixation is performed near the peripheral edge 15a of the center hole on the inner surface of 5. Further, the end of the inner rubber layer 11a is bent along the outer circumferential surface of the hard flange plate 15, and if necessary, a vulcanized rubber is attached thereto to form a rubber part 18 for packing. In this way, the rubber tube 1
After preforming 0, a wet cloth tape (not shown) is wrapped around its outer circumferential surface. This is placed in a vulcanization pot and vulcanized using high pressure steam or the like. The wet cloth tape is tightly wrapped around the outer peripheral surface of the rubber tube 10 using high pressure steam or the like. As a result, the ends of the reinforcing cloth 13 are firmly held by the locking ring 14, the hard flange plate 15, and the locking member 16.
A joint member 12 is integrally fixed to the rubber tube body 11.

Although a C-shaped locking member 16 is illustrated, a plurality of arc-shaped rods are used, arranged in a ring, and the inner diameter of the rod is ultimately larger than the outer diameter of the locking ring 14. Just make it smaller. Furthermore, the cross-sectional shape of the locking member 16 is not limited to circular, but may be polygonal, for example, the cross-sectional shape shown in FIG. 4 may be used. Furthermore, reinforcing cloth 13
In order to increase its strength, short fibers can also be mixed inside it.

〔Effect of the invention〕

As described above, the method for manufacturing a rubber tube of the present invention involves fitting a locking ring onto the reinforcing cloth on the outer peripheral surface of the inner layer rubber, folding the end of the reinforcing cloth around the locking ring, and After fitting a washer-like hard flange plate to the outer periphery of the folded part and forming an outer layer of rubber around the outer periphery of the reinforcing cloth, a partially open locking member is fitted to the inner diameter end of the hard flange plate to adjust its inner diameter. The coupling member can be firmly fixed to the rubber tube body by a simple process of tightening it so that it is substantially smaller than the outer diameter of the locking ring, and then welding it to the locking ring. It is possible to efficiently manufacture a lightweight rubber tube with a larger effective bending length than in the past. In addition, the inner diameter of the locking member can be reduced by tightening, so by adjusting the degree of tightening, it can be used even if the outer diameter of the rubber tube body is slightly different. Since the reinforcing fabric is fitted in such a way as to hold down the folded part, it is easy to accommodate changes in the thickness of the reinforcing fabric and the thickness of the locking ring by simply changing the size of the center hole of the hard flange plate. be able to.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a main part showing an example of a conventional rubber tube, Fig. 2 is a sectional view of a main part of an example of a rubber tube obtained by implementing the method of the present invention, and Fig. 3 shows a metal rod thereof. The plan view and FIG. 4 are cross-sectional views showing another example of the metal rod. In the drawings, 10 is a rubber tube, 11 is a rubber tube body, 12 is a joint member, 13 is a reinforcing cloth, 14 is a locking ring, 15 is a hard flange plate, and 16 is a locking member.

Claims (1)

[Claims] 1. A step of winding unvulcanized rubber on a mandrel to form an inner layer rubber, a step of wrapping a reinforcing cloth around the outer circumferential surface of the inner layer rubber, and a step of fitting a locking ring onto the reinforcing cloth to reinforce it. a step of folding the end of the cloth around the locking ring; a step of fitting a washer-like hard metal flange plate to the outer periphery of the folded portion of the reinforcing cloth; a step of wrapping sulfur rubber to form an outer rubber layer; a step of fitting a partially open metal locking member to the inner diameter end of the hard flange plate; The method includes the steps of tightening the retaining ring so that it is substantially smaller than the outer diameter of the retaining ring and then welding the retaining ring to the hard flange plate, and vulcanizing and tightening the outer peripheral surface of the outer rubber layer with a cloth tape. A method for manufacturing a rubber tube characterized by: