JPH04163128A - Method for processing joint of branch pipe - Google Patents

Abstract

PURPOSE:To enhance execution properties and the reliability of a joint by a method wherein a plane part is allowed to protrude in the connection region of the branch pipe of a raw pipe to be perforated to form a mounting port and a rubber ring is provided to the inner peripheral edge of said port and a processing mold is inserted in the raw pipe and a short pipe is bonded to the peripheral edge of the mounting port under pressure so as to include the rubber ring by the processing mold. CONSTITUTION:A raw pipe 11 is made of a thermoplastic resin and the region of the connection part of a branch pipe is subjected to blow molding to form a plane part in a protruding state and this plane part is perforated to form a mounting port 11A. A processing mold 14 has a hydraulic jack 21, a flange part 22 and a short pipe introducing part 23 and the flange part 22 is equipped with a seating surface 22A and a folded-back processed groove 22B having depth three times the thickness of a receiving mouth short pipe 12. The processing mold is inserted in the raw pipe and the flange part 22 is pressed to the planar inner surface of the plane part around the mounting port 11A of the plane part 15 of the raw pipe by the jack 21 and a short pipe introducing part 23 is set within the mounting port 11A and a rubber ring 13 is provided to the peripheral edge part of the mounting port 11A. The leading end of the receiving mouth short pipe 12 is softened under heating and pressed into the rubber ring 13 by a press and bonded to the peripheral edge part of the mounting port 11A so as to include the rubber ring 13 by the processing mold.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for processing a branch pipe joint.

[Prior Art] In conventional branch pipe joints, when attaching a short socket pipe for connecting a branch pipe to an attachment port provided on a main pipe, the saddle is glued to the outer periphery of the main pipe so as to tightly fit it. , a short socket pipe is attached to this saddle.

In addition, in other conventional branch pipe joints, a caulking material is filled between the outer circumference of the above-mentioned original pipe and the saddle,
Efforts are being made to improve water-stopping properties.

[Problem M to be solved by the invention] However, the above-mentioned prior art has the following problems (1) to (3).

■Since the branch pipe joint is constructed using a wet installation method using adhesive, workability is poor.

■The short socket pipe is attached to the original pipe through a saddle, and the attachment strength is low.

■The saddle is glued to the main pipe and is fixedly attached to the short socket pipe or the saddle, making the attachment part of the short socket pipe to the main pipe both flexible and watertight. I can't.

In addition, in conventional branch pipe fittings, in order to construct branch pipe joints using a dry installation method that does not use adhesive, the tip of the short pipe is press-fitted into a rubber ring provided at the fitting port of the original pipe. There are some, but there is a concern that the short pipe may come off.

In the present invention, when attaching the short socket pipe to the attachment port of the original pipe,
The purpose is to improve workability, improve attachment strength, combine flexibility and watertightness, and also reliably prevent the short pipe from coming off and improve the reliability of the joint. do.

[Means for Solving the Problems] The present invention provides a method for processing a branch pipe joint in which a short port pipe for connecting a branch pipe is attached to a master pipe, in which the branch pipe connection area of the master pipe is blow-molded. A molded flat part that is perpendicular to the axis of the branch pipe is formed protrudingly, an attachment opening is bored in the molded flat part, a rubber ring is attached to the peripheral edge of the attachment opening, and a short tube tip is machined in the original tube. Insert the mold, heat and soften the tip of the short tube, and press-fit it into the rubber ring, and then wrap the tip of the short tube with the short tube tip processing mold around the periphery of the fitting opening. It is designed to be crimped.

[Effect] According to the present invention, there are the following effects (1) to (2).

■It is crimped by wrapping a rubber ring around the tip of the short socket pipe or the periphery of the connection port provided in the original pipe, and is easy to install because it is a dry installation method that does not use the adhesive side. is good.

■The socket is crimped onto the tip of the short tube or the peripheral edge of the attachment port provided on the original tube, which can improve attachment strength.

■The tip of the short socket tube is crimped to the attachment port of the main tube via a rubber ring, making it both flexible and watertight.

■Since the tip of the short socket tube is crimped and locked onto the peripheral edge of the attachment hole provided on the original tube, there is no fear of the short socket tube coming off.

■The peripheral edge of the attachment port where the tip of the short socket tube is crimped together with the rubber ring is formed on the molded flat part of the original tube that is perpendicular to the branch pipe axis, so the tip of the short socket tube and The attachment of the rubber ring is simple and reliable, and in combination with the above items 1 to 2, the reliability of the joint can be improved.

[Example] Figs. 1(A) to (C) are schematic diagrams showing an example of a branch pipe joint according to the present invention, Fig. 2 is a front view showing a branch pipe joint, and Fig. 3 is a schematic diagram showing an example of a branch pipe joint according to the present invention.
The figure is a front view showing a short socket pipe, FIG. 4 is a schematic diagram showing a processing die, and FIG. 5 is a front view showing a diagonal branch pipe joint.

As shown in FIGS. 1 and 2, the branch pipe joint 10 of the present invention is one in which a short socket pipe 12 for connecting a branch pipe is attached to an original pipe 11, and a rubber ring 13 is used as an attachment part. It is processed using a processing die 14 as a mounting tool.

Here, the original pipe 11 is made of thermoplastic resin or the like, and is blow-molded in the branch pipe connection area, and has a protruding molded flat part 15 orthogonal to the branch pipe axis. is perforated.

In addition, the molded flat part 15 that is blow-molded in the original tube 11
The protrusion height A is the maximum value of the thickness of the folded part of the short socket pipe 12 inside the original pipe 11 and the thickness of the part of the rubber ring 13 located inside the original pipe 11, and Prevents thinning of branch pipe connections.

In addition, the short socket pipe 12 has a small diameter neck portion 1 as shown in FIG.
6 and the large diameter socket part 17 is determined by the wall thickness of the original pipe 11, the thickness of the rubber ring 13, and the short socket pipe 1.
This is the sum of the lengths of the two folded ends. Incidentally, the socket part 17 includes a rubber ring mounting part 18 for a rubber ring interposed between the socket part 17 and the branch pipe.

Further, the rubber ring 13 is connected to a fitting opening 11 provided in the original tube 11.
It is a continuous body with a C-shaped cross section that is attached to the peripheral edge of A.

Further, the processing mold 14 has a hydraulic jack 21, a collar portion 22, and a short pipe introduction portion 23, as shown in FIG. The processing mold 14 is used by being inserted into the raw tube 11, and the jack 21 presses the collar 22 against the inner surface of the flat surface around the attachment opening 11A in the forming plane part 15 of the raw tube 11, and also presses the collar 22 against the inner surface of the flat surface around the attachment opening 11A of the molded flat part 15 of the raw tube 11.
is set in the opening 11A. The flange portion 22 strongly folds back and press-fits the tip of the short socket tube 12, which is heated and softened and press-fitted into the fitting port 11A, to the peripheral edge of the fitting port 11A so as to wrap around the rubber ring 13. At this time, the short pipe introduction part 23 is connected to the short pipe 12 that is press-fitted into the fitting port 11A.
Guide the inner diameter of the tip.

Note that the flange portion 22 of the processing die 14 is a seating surface 22 along the plane around the attachment opening 11A in the forming plane portion 15 of the original tube 11.
A, and a folded groove 22 provided at the base opening of the short pipe introduction part 23 and having a depth h approximately three times the wall thickness of the short pipe 12.
B. The diameter d of the short pipe introduction part 23 is 0.5 to 1.01 smaller than the average pipe inner diameter, and the diameter of the collar part 22 is r.
Let D=a+4hJ.

Hereinafter, the processing procedure for the branch pipe joint 10 will be explained.

(1) The branch pipe connection region of the master pipe 11 is softened by heating and solo-molded, and a molded flat portion 15 perpendicular to the branch pipe axis is formed in a protruding manner (see FIG. 1(A)).

(2) Drill an attachment opening 11A in the molded flat part 15 (first
(See figure (B)).

(3) Attach the rubber ring 13 to the peripheral edge of the attachment opening 1.1A.

(4) Insert the processing die 14 into the original tube 11.

(5) The tip of the short socket tube 12 is heated and softened, and is press-fitted into the rubber ring 13 using a press machine (not shown), and the tip of the short socket tube 12 is wrapped around the rubber ring 13 by the processing mold 14. Press it onto the peripheral edge of the attachment opening 11A.

According to the above embodiment, the following effects (1) to (4) are achieved.

■The tip of the short socket pipe 12 is the attachment port 11 provided in the original pipe 11.
The rubber ring 13 is crimped around the peripheral edge of A, and is easy to install because it is a dry attachment method that does not use adhesive.

■Attachment port 11A where the tip of the short socket pipe 12 is provided in the main pipe 11
It is crimped onto the peripheral edge of the holder, which improves the attachment strength.

■The tip of the short socket pipe 12 is connected to the main pipe 1 through the rubber ring 13.
It is press-fitted to the attachment opening 11A of No. 1, and can have both flexibility and watertightness.

■Attachment port 11A where the tip of the short socket pipe 12 is provided in the main pipe 11
Since it is crimped and locked onto the peripheral edge of the socket, there is no fear that the short socket pipe 12 will come off.

■The peripheral edge of the fitting port 11A, where the tip of the short pipe 12 is crimped together with the rubber ring 13, is formed on the molded flat part 15 of the original pipe 11 perpendicular to the branch pipe axis; The attachment of the tip of the short tube 12 and the rubber ring 13 is simple and reliable;
Coupled with the above items 1 to 2, the reliability of the joint can be improved.

The diagonal branch pipe joint 30 shown in FIG.
The only difference is that the axis of the branch pipe diagonally intersects with the main pipe 11. Even in the diagonal branch pipe joint 30,
The molded flat portion 15 that is blow-molded in the branch pipe connection region of the original pipe 11 is formed to protrude orthogonally to the branch pipe axis.

[Effects of the Invention] As described above, according to the present invention, when attaching the short socket pipe to the attachment port of the original pipe, workability is improved, attachment strength is improved, and flexibility is achieved. In addition to providing both durability and watertightness, it also reliably prevents the short pipe from coming off, improving the reliability of the joint.

[Brief explanation of drawings]

1A to 1C are schematic diagrams showing an example of a branch pipe joint according to the present invention, FIG. 2 is a front view showing the branch pipe joint, and FIG.
The figure is a front view showing a short socket pipe, FIG. 4 is a schematic diagram showing a processing die, and FIG. 5 is a front view showing a diagonal branch pipe joint. 10.30... Branch pipe joint, 11... Original pipe, 11A... Attachment port, 12... Socket short pipe, 13... Rubber ring, 14... Processing type. Patent applicant Sekisui Chemical Co., Ltd. Representative Hiroshi 1) Kaoru Figure 1 (A) 1 et al. (B) (C) Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] (1) In a processing method for a branch pipe joint in which a short socket pipe for connecting a branch pipe is attached to a master pipe, the branch pipe connection area of the master pipe is blow molded to form a molded flat part perpendicular to the branch pipe axis. A fitting hole is bored in the flat surface of the molded part, a rubber ring is attached to the peripheral edge of the fitting hole, a short tube tip processing die is inserted into the raw tube, and the short tube tip is heated. A branch pipe joint characterized in that the short pipe is softened and press-fitted into the rubber ring, and the tip of the short pipe is crimped to the peripheral edge of the fitting opening so as to wrap around the rubber ring using the short pipe tip processing mold. processing method.