JPH047696B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a core metal device for manufacturing resin pipes.

One method for manufacturing resin pipes involves wrapping a resin-impregnated fiber band around a cylindrical core device and solidifying it. FIG. 1 shows a conventional core metal device 1, which includes a socket core 2 and a straight core 3. As shown in FIG. 4 is a resin tube formed by wrapping a resin-impregnated fiber band around this core device 1 and solidifying it;
It has a socket part 5 and a straight part 6 corresponding to.

By the way, when removing the resin tube 4 from the core metal device 1 after forming the resin tube 4, conventionally, an annular face plate 7 is brought into contact with the end face of the socket portion 5, and this face plate 7 is attached to the straight core metal 3. It is customary to separate the resin tube 4 from the core device 1 by pushing it toward the core device 1.

However, although these conventional products are convenient for removing relatively small diameter and short length resin pipes, they cannot be used for large diameter long pipes with a diameter of 3000 mm and a length of 4000 mm. , resin pipe 4 and core metal device 1
The problem is that it is difficult to apply because the frictional force between the two is large.

SUMMARY OF THE INVENTION The object of the present invention is to solve these problems and to make it possible to easily extract even a relatively large diameter and long resin pipe from a core metal device. be.

In order to achieve this object, the present invention includes a cylindrical inner cylinder, a cylindrical core bar arranged concentrically at an interval in the radial direction on the outside of the inner cylinder, and a cylindrical core bar that is fitted around the inner cylinder. , an annular elastic body capable of supporting the cored metal by allowing the diameter of the cored metal to expand, and an annular elastic body that is supplied into the annular space formed between the inner cylinder and the cored metal to expand the diameter of the cored metal through elastic deformation. A supply path for high temperature pressurized fluid is provided.

Therefore, by injecting high-temperature pressurized fluid into the annular space, the core metal expands to a predetermined dimension through elastic deformation due to the action of temperature and pressure, and the resin is formed around the core metal in this state. A resin tube can be formed by wrapping an impregnated fiber band around it and curing it. Once the resin tube is formed, by injecting low-temperature, low-pressure fluid into the annular space, the core bar will return to its original diameter and the resin tube will be The inner surface of the pipe and the outer surface of the core bar will separate from each other, and a large frictional force will no longer act between them, making it difficult to easily pull out even a long resin pipe with a large diameter from the core bar. can.

Examples of the present invention will be described below. FIG. 2 shows an embodiment of the core metal device for manufacturing resin pipes according to the present invention, in which 11 is a core body with a double cylindrical jacket structure, and radial support members 1 are provided inside both ends of the core body.
2, journals 13 and 14 are attached concentrically. Projections 15 from the core body 11 are formed in both journals 13 and 14, and these projections 15 are rotatably supported by rollers or the like, so that the resin-impregnated fiber band is rotated while the core body 11 is rotated. It is designed so that it can be wrapped around.

The core body 11 has a body core 16, and a socket core 17 and a socket core 18 that are removably attached to both ends of the body core 16. Among these, the body core metal 16 includes a cylindrical inner tube 19,
A cylindrical core metal 20 is provided concentrically and spaced apart from each other in the radial direction on the outside of the inner cylinder 19. The inner cylinder 19 extends in the axial direction from both ends of the body core bar 16, and the socket core bar 17 and the socket core bar 18 are externally fitted and fixed to both extending portions 21. There is. 22 is a partition plate between the body core metal 16 and the socket core metal 17, and 23 is a partition plate between the body core metal 16 and the socket core metal 18; these partition plates 22,
23 is fixed to the inner cylinder 19.

A plurality of annular ribs 24 are erected in the axial direction on the outer periphery of the inner cylinder 19 to reinforce the inner cylinder 19.
As shown in FIGS. 3 and 4, both partition plates 22,
Groove-shaped elastic body receiving members 25 that open outward in the radial direction are provided on the side surface of the body core bar 16 side of the body part 23 and on the outer circumferential end of the ribs 24 at appropriate intervals in the axial direction. An annular rubber elastic body 26 is fitted onto each body receiving member 25 . The core metal 20 is supported concentrically with the inner cylinder 19 by these elastic bodies 26. Further, the elastic body 26 supports the core metal 20 while being compressed and deformed by the core metal 20, and allows the diameter to expand to some extent due to the elastic deformation of the core metal 20. In addition, as shown in FIG. 3, the end of the core bar 20 has a
An annular sealing material 28 that can slidably seal between the end face of the core metal 20 and the partition plates 22 and 23 to form a watertight annular space 27 between the core metal 20 and the inner cylinder 19. is provided.

The socket core metal 17 has a socket inner cylinder 29 that is fitted onto the extension part 21 of the inner cylinder 19, and a socket core 30 that can form the inner surface of the socket of the resin pipe. Body core metal 1
A separate watertight small space 31 on the socket side is formed independent of the annular space 27 at 6. The socket inner cylinder 29 and the socket core 30 are fixed to each other by ribs 32, and as shown in FIG.
It is made of a material thicker than 6, so that elastic deformation is less likely to occur.

The insertion part core bar 18 has an insertion inner cylinder 33 that is fitted onto the extension part 21 and a socket core 34 that is supported by an elastic body 26 like the core bar 20. A separate watertight small space 35 on the insertion side is formed independent of the annular space 27. It also has a rib 36 and an elastic body receiving member 37 similar to those of the body core metal 16.

The socket core metal 17 and the socket core metal 18 are removably fixed to the extension part 21, and for example, as shown by the imaginary line in FIG.
If 7 is fixed, it is also possible to manufacture both receiving tubes.

As shown in FIG. 2, the annular space 27 of the body core metal 16 is divided into a plurality of body small spaces 38 in the axial direction by each elastic body 26. Each small space 31,
A high temperature pressurized water supply path 39 is connected to 38 and 35. On the other hand, 40 is each small space 31, 38, 3
The supply path 39 and the discharge path 40 are constituted by pipes, and form a circulation path 41. 42 is a water storage tank, 43 is a heat exchange tank,
44 is a pump. There is a heat source 4 in the heat exchange tank 43.
A heat exchanger 46 connected to 5 is provided,
The water in the tank 43 can be heated or cooled.

In such a configuration, when manufacturing a resin pipe, each small space 31, 38, 3 is connected from the supply path 39.
High-temperature pressurized water is injected and circulated into the tank. Then, the core metal 20 and the socket core metal 34 undergo elastic deformation due to the effects of temperature and pressure, and expand to a predetermined size. In addition, at this time, as mentioned above, the socket core bar 3
0 does not undergo elastic deformation and maintains a predetermined dimension. That is, the socket core bar 30 is formed in advance to have a predetermined size so that dimensional changes do not occur, so that the socket part of a resin pipe, which particularly requires precision, can be formed satisfactorily.

The device in this state is slowly rotated to wind the resin-impregnated fiber band around the core body 11 in a spiral shape. Once the winding is completed, the resin is cured by appropriate means such as heating to form a resin tube.

When removing the molded resin tube from this device,
Low-temperature, low-pressure water is injected from the supply path 39 into each of the small spaces 31, 38, and 35 and circulated. Then, the diameter of the core bar 20 and the socket core bar 34, which had been expanded to a predetermined size due to the action of the high temperature pressurized water, is reduced in diameter, and the inner surface of the resin tube and the outer surface of the core bar 20 and the socket core bar 34 are brought into contact with each other. They will separate from each other, and no large frictional force will act between them. Therefore, by using a face plate similar to that shown in FIG. 1, it becomes possible to easily extract the resin pipe.

Specifically, as high-temperature pressurized water, the temperature is 80℃.
℃±10℃ and a pressure of 22Kg/cm ² are used, and as low-temperature, low-pressure water, a temperature of 20℃ and a pressure of 2Kg/cm ² is used. This results in a temperature difference of 50℃ and a pressure difference of 20℃.
Kg/ ^cm2 can be achieved. At this time, for example, in the case of a core metal with a nominal diameter of 3000 mm, if the wall thickness is approximately 17 mm, a diameter change of 1.65 mm due to the temperature difference and 2.6 mm due to the pressure difference, a total of 4.25 mm can be obtained. . Similarly, for example, in the case of a core metal with a nominal diameter of 5200 mm, a diameter change of 2.86 mm due to the temperature difference and 5.2 mm due to the pressure difference, for a total of 8.06 mm, can be obtained.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a conventional example, Fig. 2 is a partially cutaway overall view of an embodiment of the present invention, Fig. 3 is an enlarged view of part A in Fig. 2, and Fig. 4 is an enlarged view of part B in the same. It is a diagram. 11... Core metal body, 16... Body core metal, 17...
...Socket core metal, 18... Socket core metal, 19... Inner cylinder, 20... Core metal, 25, 37... Elastic body receiving member, 26... Elastic body, 39... Supply path, 40...
Discharge path, 41...circulation path.

Claims (1)

[Scope of Claims] 1. A core metal device for manufacturing a resin pipe by winding a resin-impregnated fiber band, which comprises: a cylindrical cylinder; and a concentric metal core at a radial interval on the outside of the inner cylinder. a cylindrical core metal disposed in the inner cylinder, an annular elastic body that is fitted onto the inner cylinder and can support the core metal while allowing the diameter of the core metal to expand, and a space between the inner cylinder and the core metal. A core metal device for manufacturing a resin pipe, comprising: a supply path for a high temperature pressurized fluid that is supplied into an annular space to be formed and expands the diameter of the core metal through elastic deformation.