JPS6063129A - Diameter-extended socket molding for hole tube - Google Patents

Abstract

PURPOSE:To improve the sealing property preventing possible ruggedness on the inner peripheral surface of a diameter-extended socket by mounting a short tube inside the end of a hole tube through a sealing material and heating it soft to extend the diameter thereof. CONSTITUTION:A synthetic resin short tube 2 having the outer diameter smaller than the inner diameter of a hole tube 1 is mounted inside the socket 4 thereof through rubber packings 3a and 3b and the socket is heated soft. An internal die is inserted into the short tube to extend the diameter thereof to form a diameter-extended socket 7 having an inclined section 5 and a large diameter socket 6. This eliminates ruggedness inside the diameter-extended socket 7 thereby allowing a water-sealed jointing thereof with a connection tube 8.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to a synthetic resin pipe (hereinafter referred to as a hole pipe) having no unevenness at the end thereof, which is formed by having a large number of through holes extending in the pipe axis direction through the pipe wall. The present invention relates to a method of molding an enlarged diameter socket with excellent sifting properties.

[Prior art]

Since then, many methods have been proposed for forming an enlarged diameter socket at the end of a hole pipe, but in forming the enlarged diameter socket of a hole pipe, the through hole is Due to the difference in the tension of the wall part and the shrinkage after processing, the through hole is crushed and the tube wall in that part is dented, causing unevenness on the inner circumferential surface of the enlarged diameter part.1. Problems arise in performance such as sealing performance.

For this reason, there are methods to form the enlarged diameter socket by pressurizing fluid into a large number of continuous holes along the pipe axis of the pipe wall, or to mold the inner surface of the enlarged diameter socket using a vacuum forming method. A molding method has been used in which the mold surface is brought into close contact with the mold surface to eliminate unevenness, but this requires a special air pressure device or vacuum device, which inevitably increases costs.

(Objective of the Invention) The present invention does not use the above-mentioned means (when forming a diameter-expanding socket at the end of a hole tube), but instead inserts a short tube inside the end of the hole tube to expand the diameter. It is an object of the present invention to provide a method for forming an enlarged diameter socket of a hole pipe, thereby preventing unevenness and improving sealing performance.

(Structure of the Invention) In order to achieve the above object, the present invention provides a method for forming an enlarged diameter socket in a synthetic resin ball tube in which the tube wall is penetrated with a large number of through holes in the tube axis direction. A solid short tube having an outer diameter smaller than the inner diameter of the hole tube is installed inside the end of the hole tube via a sealing material, and then the hole tube and the short tube are heated and softened, and then an enlarged diameter socket is formed. This is what I am trying to do.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

The hole tube 1 has a large number of through holes 1a formed in the tube wall in the tube axis direction, and the enlarged diameter socket is first formed as shown in FIG. A regular solid short tube 2 made of synthetic resin has a rubber gasket 3a inside the end of the hole tube 1.

3b is interposed and the interior is inserted with -. At this time, rubber gasket 3
It is preferable to wrap a and 3b around the outer periphery of the short tube 2 in advance and then insert them inside the hole tube 1, as this makes it easier to interpose them.

In this state, the tube end of the Hall tube 1 and the ri tube 2 are
The socket portion 4 is softened by heating it to the softening temperature of the synthetic resin that constitutes it. Such softening causes the short tube to expand and become tightly set.

Next, in this state, as shown in FIG. 2, using a mold (not shown) consisting of an inner mold and an outer mold at the end of the Hall tube 1
An enlarged diameter socket part 7 having an inclined part 5 and a large diameter socket part 6 is formed.

If an adhesive (not shown) is applied to the inner periphery of the large diameter socket 6 formed as described above and the connecting pipe 8 is fitted, the enlarged diameter socket 7
and the connecting pipe 8 are joined in a watertight manner.

FIG. 3 shows another embodiment of the present invention, in which a diameter-expanding socket is formed using a mold (not shown) consisting of an inner mold, an outer mold, etc. in a softened state as in Example M. 7 is molded. During this molding, an annular vortex 9 is formed in the socket part 7. Then, a rubber ring 10 is fitted into the annular shape 119 using a fitting device, as shown by the two-dot chain line in FIG. If the large diameter connection vi8 is fitted by pressing the rubber ring 10, the connection w8 will fit into the rubber ring 10.
They are elastically and watertightly connected via the .

FIG. 4 shows yet another embodiment of the present invention. In the embodiment shown in FIG. 2, 1. The rubber fittings 3a and 3b were interposed between the tube 1 and the short tube 2, but in this example, the rubber tube 11 was inserted into the enlarged diameter socket instead of the rubber fittings 3a and 3b. The rubber tube 11 is molded by being interposed over almost the entire area between the hole tube 1 and the short tube 2.If the rubber tube 11 is used in this way, as shown in FIG. To form an enlarged diameter socket part 7 which has an excellent sealing effect with a connecting pipe 8 and further increases the sealing effect of the pipe, further prevents the occurrence of unevenness on the inner circumferential surface of the enlarged diameter socket part 7. It is possible/to be possible.

Furthermore, in the embodiment shown in FIG.
Instead of 1, an adhesive may be used.

[Effect of the Invention 7] As described above, the present invention provides a short tube having an outer diameter smaller than the inner diameter of the Hall tube, which is installed inside the end of the short tube with a sealing material interposed therebetween, and after being heated and softened, the short tube is sealed from the inside of the short tube. Since the diameter is expanded by inserting the inner mold, there are no irregularities on the inner circumferential surface of the diameter-expanded socket, and the sealing function can be fully fulfilled.

In addition, a sealing material is used to fill the gap between the hole pipe and the short pipe.
This can perform the sealing function.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the present invention. Figure 1 is a cross-sectional front view of a short tube set with a rubber packing interposed in a hole tube, and Figure 2 is a cross-sectional front view of an enlarged diameter socket. FIG. 3 is a cross-sectional front view of an enlarged diameter socket fitted with a rubber ring of another embodiment, and FIG. 4 is a front sectional view of an enlarged diameter socket fitted with a rubber tube of another embodiment. FIG. 3 is a cross-sectional front view of the mouth. 1 is a hole pipe, 1a is a through hole, 2 is a short pipe, and 3a. 3b is a rubber gasket, 5 is an inclined part, 6 is a large diameter socket part, 7
9 is an annular groove, 10 is a rubber ring, and 11 is a rubber tube. Go 1 cause - 2 voice 3 evil 4th prisoner

Claims (1)

[Claims] 1. In a method of molding an enlarged diameter socket in a synthetic resin hole tube with a large number of through holes in the tube axis direction in the tube wall, a solid short tube having an outer diameter smaller than the inner diameter of the hole tube is A hole tube expansion method characterized in that the inner end of the tube is filled with a sealing material, and then the hole tube and the short tube are heated and softened, and then an inner mold is inserted from the inside of the short tube to expand the diameter. Diameter socket forming method.