JPS5976210A - Socket structure of synthetic resin pipe and forming method for socket - Google Patents

Abstract

PURPOSE:To facilitate the work of expanding a socket part, while reinforcing said socket part and blockading holes in a wall, by inserting a cap having a hollow flange onto the socket part of a pipe having through holes extending through its wall. CONSTITUTION:One side end part of a synthetic resin straight pipe 1 having holes extending through its wall is covered with a cap 4 made of the same material as that of the pipe 1. Said cap 4 is a member prepd. by forming an outer sheath pipe 4a for covering the outer surface of the end part of the pipe material 1 as a unitary body with a hollow flange 4b turned up onto the inner surface of the pipe material 1. At first, an annular rubber cover 5 is attached to the interior of the peripheral groove of said hollow flange 4b, the cap 4 whose inner surface has been coated with an adhesive agent is inserted onto the outer surface of the pipe material 1 and pushed in until the opened edge of the pipe material 1 comes in contact with the inmost recess of the hollow flange 4. Thereafter, the end part of the pipe material 1 covered with the cap 4 is expanded into a pipe 2 having through holes extending through its wall by hot working. Then, the socket 3 of the pipe material 1 is formed into a double-stage expanded shape comprising right and left expanded step parts 2a, 2b and an intermediate expanded part 2c therebetween, and the cap 4 is formed as a unitary body with the pipe 2 having through holes extending through its wall by hot welding.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic <'41 fat pipe used for sewage piping, etc., by connecting a large number of pipes, particularly a pipe wall in which a large number of wall holes in the pipe axis direction are arranged. The present invention relates to a socket structure and a socket molding method for a through-hole synthetic resin pipe.

The general structure of a socket as a coupling means for this type of synthetic resin pipe is that the socket, into which the cut end of the adjacent pipe is inserted, has an enlarged diameter step and a nozzle in the middle of the enlarged diameter step. A ring-loading enlarged-diameter part is formed, and when piping, the rubber tube installed in the seal-ring-loading enlarged-diameter part is connected to the ring by joining, and the wall hole is connected to the seal ring. In order to prevent leakage of liquid and inflow of external water through the wall hole, various wall hole closing means are usually provided.

By the way, during socket molding in Jumei, the synthetic resin pipe material with the tube wall through-hole manufactured by extrusion molding is subjected to cutting/heating processing, so it is especially important to apply seal ring loading and diameter expansion at the diameter expansion step part. The wall of the pipe becomes thinner, leading to a decrease in the strength of the pipe body.
As a result, the pipe body is susceptible to damage due to external vibrations and shocks during transportation or burial work, and unsightly wavy wrinkles form on the outer circumferential surface of the socket due to the collapse of the wall hole. This glaze phenomenon was particularly noticeable in the ring swelling part where the diameter was expanded in two stages.

In addition, methods for closing wall holes in conventional socket structures include a method in which a ring with a large number of plugs cut out in the axial direction on the circumference is inserted from the opening end surface of the wall hole, and Methods have been adopted in which the wall hole is crushed by heating and softening the material, but both methods have the drawbacks of being troublesome to process and difficult to securely close.

The present invention has been made in order to solve the above-mentioned difficulties.In other words, the purpose of the present invention is to prevent a decrease in strength and harmful deformation of the synthetic resin pipe with the pipe wall passage during the molding of the socket. It is an object of the present invention to provide a socket structure and a socket molding method for a synthetic resin pipe of this kind, which can easily and reliably close the wall hole without causing the problem.

As a means for achieving the object, the socket structure and socket forming method of the present invention provide (1) a seal ring loading enlarged diameter part in the middle of the socket part of the pipe wall-through hole synthetic resin pipe at the pipe end 1; A synthetic resin jtt cap is integrally formed with an outer jacket tube that covers the outer peripheral surface, and a bag boxwood that extends from the other end of the outer jacket tube and is folded back onto the inner peripheral surface of the synthetic resin tube, The structure is characterized in that the socket portion of the synthetic resin pipe is coated, (2) an outer jacket tube is provided at one end of the synthetic resin pipe material with the pipe wall through-hole, and covers the outer circumferential surface of the end. and a synthetic resin cap formed by integrally molding a boxbox which extends from the side end of the jacket cylinder and is folded back onto the inner circumferential surface of the synthetic resin pipe material, and is then heated and expanded. The present invention is characterized by a forming method in which an enlarged diameter step portion and a seal ring loading enlarged diameter portion intermediate the 1'O1 enlarged diameter step portion are formed on the one end portion by diameter machining.

Hereinafter, the present invention will be explained based on one embodiment shown in the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a tube wall through hole tube material as a synthetic resin tube material in which a large number of wall holes that are tributary or partially closed in the tube wall direction are lined up over the entire circumference. In FIGS. 3 and 4, reference numeral 2 denotes a wall-through-hole tube having a socket formed at the end of the wall-through-hole tube material 1. As shown in FIG.

Therefore, when molding the socket 3 of the tube wall through-hole tube 2 of the embodiment shown in FIGS. 3 and 4, first, as shown in FIGS. 1 and 2, polyvinyl chloride, etc. A synthetic resin camp 4 made of almost the same material as the pipe material 1 is coated on one end, that is, the right end in the drawing, of a straight pipe wall-through-hole pipe material made and bonded by extrusion molding of synthetic resin. , this cap 4
A jacket tube 4a that covers the outer circumferential surface of one end of the tube material 10, and a jacket tube 4a that extends from the other end of the jacket tube 4a, that is, the right end in the drawing, and is attached to the inner circumferential surface of the tube material 1 with a through-hole in the tube wall. Folded bag brim 4b
The parts are integrally molded by injection molding.

However, in order to attach the lever cap 4, first, the rubber ring cover 5 is inserted deep into the circumferential groove of the bag collar 4b, and then the inner circumference of the cap 4 is completely twisted or completely removed if necessary. After applying adhesive to the whole or part of the joint surface of the tube 1 with the cap 4, insert the cap 4 onto the outer circumferential surface of the tube 1 so that the opening edge of the tube 1 is aligned with the bag collar 4b. Push it in until it hits the back.

The material for the ring lid 5 may be vulcanized rubber, semi-vulcanized rubber, water-swellable rubber, or the like.

Next, the illustrated end portion of the wall-through-hole tube material 1 with the cap 4 attached thereto as described above is expanded in diameter into the shape shown in FIG. However, the socket 3 of the tube wall through-hole tube 2 is located at the enlarged diameter stepped portions 2a and 2b on the left and right sides of the drawing.
and the enlarged diameter stepped portion 2a.

The cap 4 is formed into a shape with a diameter enlarged in two stages with the enlarged diameter portion 2C located in the middle of the cap 2b.During this molding, the cap 4 is tightly attached to the tube wall through-hole tube 2 by heat fusion. Since they are integrated, no gap is created between them and the interpipe 2.

Note that when the adjacent pipe 6 is inserted into the socket 3, the inner circumferential groove L of the seal ring loading enlarged diameter portion 2c (a rubber seal ring 7 is interposed), so that the adjacent pipe 6 is inserted into the ring 7. It is joined to the inner hole of the tube 2 through the tube wall through hole.

Since the molding method of the embodiment is performed in this way, in the structure of the socket 3 of the embodiment, the socket 3 of the pipe wall through-hole pipe 2 is
The outer peripheral wall of the part is thickened by the thickness of the cap 4,
As a result, the outer circumferential surface of the cap 4 is smoothed by heating during molding of the socket 3, so that not only no wave-like wrinkles occur, but also no reduction in the strength of the pipe body of the socket 3 occurs.

Unfortunately, in the structure of the socket 3 of the embodiment, the wall hole 2d is closed with the annular lid 5 at the same time as molding, so it is necessary to use a special member or special processing to close the wall hole 2d. Nagu,
Therefore, the answer to the lesson of socket 3 is easy and simple.

Note that the ring cover 5 may be omitted, and in this case, the wall hole 2d
is closed by adhesion or heat fusion between the deep inner surface of the cap 4 and the end surface of the tube wall through-hole tube 2 .

As described above, according to the socket structure and socket forming method for a wall-through pipe according to the present invention, by covering the socket part of the pipe with a wall-through hole, the socket part is covered with a cap. In addition to reinforcing the outer peripheral wall with the jacket tube of the same cap, the bag brim of the same camp is designed to make the end surface of the tube wall through hole sharp, so the strength of the tube body at the socket part is sufficiently increased. In addition to being able to maintain the quality of pipes, it also provides a socket with a good appearance, and is easy to process to form the socket and close the wall hole. This has the effect of improving product quality and marketability.

[Brief explanation of the drawing]

FIG. 1 is a close view of a tube wall through-hole tube material to which a cap is attached in a pre-process of a socket forming method showing an embodiment of the present invention, and FIG. 2 is a perspective view of the cap shown in FIG. 1. Fig. 3 is a cross-sectional view of the pipe with a hole in the wall after the post-process of the socket forming method, and Fig. 4 is a cross-sectional view of the upper half taken along line IV-IV in Fig. 3. . 1. Pipe wall through hole pipe material as synthetic wood 111 m pipe material, 2.
・Pipe wall through-hole pipes as joint paulownia fat pipes, 2a, 2b...
Expanded diameter stepped portion, 2c...Seal ring bulge, 3...Socket, 4...Cap, 4a...Sheath cylinder, 4b...
Fukuroba. Patent Applicant CI Kasei Co., Ltd. Agent/Patent Attorney Norihiro Nishimura 4

Claims (2)

[Claims] (1) In a synthetic resin pipe socket structure in which a large number of wall holes are arranged in the pipe wall in the pipe axial direction, from the 7-ring loading enlarged diameter part in the middle of the receiving recess of the synthetic resin pipe to the pipe end. A jacket tube that covers the outer circumferential surface and a pipe M3 extending from all sides of the jacket tube.
A synthetic resin pipe receiver, characterized in that a synthetic resin cap, which is formed by integrally molding a folded bag collar on the inner peripheral surface of the m-hole pipe, is attached to the socket of the synthetic resin pipe. Mouth structure. (2) In a socket molding method for a pipe with a wall through-hole in which a plurality of wall holes are arranged in the pipe wall in the pipe axial direction, one end of the synthetic resin pipe material is provided with an outer sheath that covers the outer circumferential surface of the end. A synthetic resin cap consisting of a tube and a boxbox which extends from the sides of the same outer panel and is folded back onto the inner circumferential surface of the synthetic resin pipe is integrally molded, and then heated. By the diameter expansion process, an enlarged diameter step that constitutes the socket and a seal ring loading enlarged diameter section in the middle of the enlarged diameter step are formed on one end of the cap where the outer jacket tube is attached. A method for molding a synthetic resin pipe socket, which is characterized by its tightness.