JPH0781667B2 - Pipe positioning tool - Google Patents

Abstract

PURPOSE:To prevent a joint and a pipe from rotating in their peripheral direction so as to surely perform fixing by providing a stopper part by which peripheries of the joint and the pipe are respectively stop-supported, in a joint positioning part and a pipe positioning part in a positioning tool main unit. CONSTITUTION:Both end part peripheral surfaces 21 of a joint 2 are grasped in a joint positioning part 11 of a pipe positioning tool 1. Peripheral surfaces 31 of both pipes 3 are respectively grasped by a pipe positioning part 12. Peripheries of the joint 2 and both the pipes 3 are stop-supported by stopper parts 111, 121, consisting of a lock pawl, respectively provided in the joint positioning part 11 and the pipe positioning part 12. Thus, the joint 2 and both the pipes 3 are impeded from rotating in the peripheral direction and surely fixed.

Description

Description: TECHNICAL FIELD The present invention relates to a pipe positioning tool, and in particular, to a welding joint and two thermoplastic resin pipes inserted at both ends of the joint, respectively. Are used for positioning and fixing so that they are located on the same straight line.

(Prior Art) When connecting thermoplastic resin pipes to each other, a thermoplastic resin welding joint in which a heating wire as a heating element is embedded in the inner peripheral surface of the receiving portion is used, and the joint of the pipe is connected to the receiving portion of this joint. There is known a technique in which the heating wire is energized to generate heat when the end portion is inserted, and thereby the inner peripheral surface of the receiving portion and the outer peripheral surface of the pipe end are melted to connect the both pipes.

By the way, in such a connection method, the pipe and the joint are connected to each other until a constant welding strength is generated after the energization so that uniform fusion is performed on the entire peripheral surface of the connection portion. It is necessary to firmly position and fix it against thermal stress and thermal deformation so that the axis does not shift.

For this reason, conventionally, a pipe positioning device as disclosed in, for example, Japanese Patent Laid-Open No. 62-62074 has been proposed.

The above-mentioned device is composed of at least one bar, and a support plate that has a fan-shaped notch portion having a different curvature corresponding to a pipe diameter at an edge portion and is slidable on the bar.
The tube applied to the fan-shaped notch is fixed to the support plate by a belt.

(Problems to be Solved by the Invention) However, the above-mentioned pipe positioning device merely aims at positioning and fixing the pipe, and does not attempt to position and fix even the joint. However, the joint and the pipe cannot be positioned and fixed so that their mutual axial centers coincide with each other. Therefore, there is a problem that uniform welding is not performed over the entire circumference of the pipe. If such uniform welding is not performed, the pipe may oscillate around the receiving part of the joint when an external force is applied to the pipe after welding, which causes the welded part. There was a problem that a crack was generated in the pipe and the gas or fluid flowing in the pipe leaked from the crack.

At the same time, there is a problem that handling of the tube is extremely troublesome because the tube is fixed by a belt.

An object of the present invention is to solve the above conventional problems.

That is, the joint and the pipe inserted from both ends of the joint can be positioned and fixed so that their respective axial cores are located on the same straight line before and after welding, and
(EN) Provided is a pipe positioning tool capable of reliably fixing a joint and a pipe by preventing rotation in the circumferential direction.

(Means for Solving the Problem) In order to solve the above-mentioned problems, the present invention is a pipe positioning tool used when two thermoplastic resin pipes are welded and connected for communication by a welding joint. Each of the positioning tool bodies is provided with two half-positioning tool bodies each having a joint positioning portion that grips the outer peripheral surface of the end portion of the joint and a pipe positioning portion that grips the outer peripheral surface of the pipe. The joint positioning portion and the pipe positioning portion are provided with locking portions that lock and support the outer circumference of the joint and the outer circumference of the pipe, respectively.

(Operation) When two pipes are connected and connected by a joint, the pipes are respectively inserted from both ends of the joint, and the joint positioning portions of the pipe positioning tool grip the outer peripheral surfaces of both ends of the joint, and at the pipe positioning portion, Grasp the outer surfaces of both tubes respectively.

By doing so, the shaft center of the joint and both pipes inserted into the joint are positioned on the same straight line.

Further, the outer circumference of the joint and the outer circumference of both pipes are locked and supported by the locking portions provided on the joint positioning portion and the pipe positioning portion, respectively, and rotation of the joint and both pipes in the circumferential direction is prevented. Securely fixed.

In the above state, the clearances at the joints between the pipe and the joint are made uniform, and normal welding can be performed without deviation.

(Example) Hereinafter, the Example of the pipe positioning tool which concerns on this invention is described based on drawing.

FIG. 1 is a central longitudinal sectional view showing a state in which two pipes are communicatively connected by a joint using the pipe positioning device according to the first embodiment of the present invention, and FIG. 2 is a view of the pipe positioning device. A side view and FIG. 3 are front views of the tube positioning tool.

This pipe positioning tool 1 is used when two thermoplastic resin pipes 3, 3 are welded by a welding joint 2 and are connected for communication.

The pipe positioning tool 1 has an outer peripheral surface 2 at the end of the joint 2.
Large cylindrical joint positioning part 11 for holding 1,21 and pipe 3,
Small cylindrical pipe positioning part 12 for holding the outer peripheral surfaces 31, 31 of 3
Two half-positioning tool bodies 1A, 1 each having and
A is provided.

The joint positioning portion 11 and the pipe positioning portion 12 have their inner and outer circumferences integrally formed in a stepwise manner with a vertical inner surface and a vertical outer surface interposed therebetween.

Furthermore, the joint positioning part 1 of these positioning tool bodies 1A, 1A
A plurality of locking parts 111, 121, ... Each of which comprises a lock claw for locking and supporting the outer circumference of the joint 2 and the outer circumferences of the pipes 3, 3 on the inner peripheral part of 1 and the inner peripheral part of the pipe positioning part 12. Is provided.

The engaging portions 111 and 121 composed of the lock claws are different in the biting angle between the outer periphery of the joint 2 and the outer periphery of the pipes 3, 3.

This angle is set so that the outer circumference of the joint 2 and the outer circumferences of the pipes 3 and 3 can be smoothly and extremely easily bited into and have a function of a backup ring.

The half-positioning tool bodies 1A, 1A are configured so that they can be opened and closed by a hinge pin 13 provided at one joint, and a locking lever-shaped clamp 14 via a spring is provided at the other joint. It is provided.

Then, in the state shown in FIG. 1, that is, in the state in which the pipes 3 and 3 are inserted and set from both ends of the joint 2, the pipe positioning tools 1 and 1 are used to set the outer peripheral surfaces of the joint 2 and the pipes 3 and 3 respectively. And the outer peripheral surface of the.

That is, the joint positioning portions 11, 11 of the pipe positioning tools 1, 1 grip the outer peripheral surfaces 21, 21 of both ends of the joint 2, and the pipe positioning portions 12, 12 hold the outer peripheral surfaces 31, 32 of both pipes 3, 3. Grab each 31.

By doing so, the joint 2 and both the pipes 3, 3 inserted into the joint 2 are supported so that their axes are on the same straight line.

Further, the outer circumference of the joint 2 and the outer circumferences of the both pipes 3, 3 are engaged with each other by the locking portions 111, 121, ... which are lock claws provided in the joint positioning portions 11, 11 and the pipe positioning portions 12, 12, respectively. The joint 2 and the two pipes 3, 3 are fixedly supported and prevented from rotating in the circumferential direction, and are securely fixed.

In the above state, the clearances at the connecting portions between the pipes 3, 3 and the joint 2 are made uniform, and normal welding can be performed without deviation.

In addition, the size of the clearance between the pipes 3 and 3 and the joint 2 is based on the JIS tolerance of the outer peripheral surface of the pipes 3 and 3 (outer diameter of the pipes 3 and 3) To secure the height of the annular base (the height between the inner peripheral surface of the joint positioning portions 11 and 11 and the inner peripheral surface of the pipe positioning portions 12 and 12) based on the locking portion 121 including the claws. To do.

The protrusion size of the locking portion 111 ... consisting of the lock claw on the joint 2 side is adjusted by adjusting the variation of the outer peripheral surface (outer diameter) of the coupling 2 by injection molding depending on the amount of protrusion of the locking portion 111. be able to.

It was confirmed by the performance strength evaluation that this dimensional adjustment should be 25% or less of the wall thickness of the tubes 3,3.

Based on this, the projection allowance of the protrusion is determined for each nominal diameter of the joint 2.

FIG. 4 shows a second embodiment of the pipe positioning tool 1 according to the present invention.

The pipe positioning tool 1 has a locking portion corresponding to the outer circumference of the joint 2.
111 is formed in the shape of a saw blade.

Since the operation of the pipe positioning tool 1 is almost the same as that of the first embodiment, its explanation is omitted.

FIG. 5 shows a third embodiment of the pipe positioning tool 1 according to the present invention.

The pipe positioning tool 1 has a locking portion corresponding to the outer circumference of the joint 2.
111 is formed of an elastic body made of rubber or the like.

Since the operation of the pipe positioning tool 1 is almost the same as that of the first embodiment, its explanation is omitted.

(Effects of the Invention) As described above, according to the present invention, the joint and the pipe inserted from both ends of the joint are arranged such that their respective axial cores are located on the same straight line before and after fusion bonding. The positioning and fixing can be performed, and the joint and the pipe can be prevented from rotating in the circumferential direction. Since the pipe and the joint can be forcibly held, a short circuit of the heating element due to movement of the heating element of the welding joint during welding can be prevented. Furthermore, since the structure is simple and compact, it is possible to easily perform work in a narrow space.

[Brief description of drawings]

FIG. 1 is a central longitudinal sectional view showing a state in which two pipes are communicatively connected by a joint using the pipe positioning device according to the first embodiment of the present invention, and FIG. 2 is a view of the pipe positioning device. A side view, FIG. 3 is a front view of the pipe positioning tool, and FIG. 4 is a second view.
FIG. 5 is a third longitudinal sectional view of the pipe positioning tool of the embodiment of FIG.
FIG. 3 is a central vertical cross-sectional view of the tube positioning tool of the embodiment. 1 ... Pipe positioning tool 1A ... Positioning tool main body 11 ... Joint positioning part 111 ... Locking part 12 ... Pipe positioning part 121 ... Locking part 2 ... Electric welding joint 21 ... End outer peripheral surface 3 ... Thermoplastic resin tube 31 ... Outer circumference surface

Claims (1)

[Claims] 1. A pipe positioning tool used when two thermoplastic resin pipes are welded and connected by a welding joint so as to communicate with each other, the joint positioning portion gripping an outer peripheral surface of an end portion of the joint, Two positioning tool bodies each having a half shape having a tube positioning section for gripping the outer peripheral surface of the tube are provided, and the joint positioning section and the tube positioning section of these positioning tool bodies are provided.
A pipe positioning tool comprising locking portions for locking and supporting the outer periphery of the joint and the outer periphery of the pipe, respectively.