JPH0243715Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a butt fusion method for butt-joining pipes such as plastic pipes or polyethylene pipes, or such pipes and joint members (elbows, cheeses, sockets, etc.) made of the same material. Regarding machines.

BACKGROUND ART In recent years, resin pipes such as plastic or polyethylene are often used as gas pipes, and fusion bonding is often employed to join such resin pipes. That is, the end faces of the tubes are heated with a heater to melt them, and the tubes to be joined are pressed together at a predetermined pressure for a predetermined period of time, and then they are allowed to cool and integrate. Such a butt fusion machine is equipped with a manual operating lever for pressing the tube end surfaces together with a predetermined force during heating and fusing of the tube end surfaces. This actuating lever is generally in the form of a swinging arm rotatably supported on the base of the fuser, and is rotatable over a predetermined angular range. However, when trying to use such a butt fusion machine to fuse a joint member that has a pipe section bent in the pipe axis direction, such as an elbow or a cheese, on the pipe end surface, the bent section may interfere with the actuating lever. The actuation lever may not be able to be rotated. Particularly in the case of gas pipes and water pipes, work is often done in narrow spaces and the orientation of the bent portion of the joint member varies depending on the installation needs. It is essential to be able to deal with the direction.

Purpose of the invention The purpose of the invention is to provide guidelines for solving the above-mentioned requirements. That is, an object of the present invention is to provide a butt fusion machine that can perform butt fusion of joint members regardless of the mounting direction of the joint members by improving the operating lever mechanism of the conventional butt fusion machine. There is a particular thing.

Structure of the invention In order to achieve the above object, the butt welding machine according to the invention includes a machine base having a guide rod extending in the axial direction of the pipes to be welded, and a machine base that is held so as to be relatively approachable and detachable along the guide rod. A fixed clamp and a movable clamp are provided for gripping the pipes to be butt-fused together or the pipes and the joint member, and an operating lever mechanism connected to the movable clamp and manually applying a pressing force to the movable clamp. The lever mechanism has a plurality of support arms that are pivotally connected to the machine base and constitute a parallel link mechanism, and an actuation lever that is detachably attached to any support arm, and at least one of the support arms has an actuation lever attached to the support arm. It is characterized by being located at a position that does not interfere with the joint member gripped by the movable clamp when the movable clamp is attached.

Embodiments Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

Figures 1 to 3 show an overview of the entire butt fusion machine for butt fusion joining a polyethylene pipe P as a city gas conduit and an elbow joint E at their end faces (butt fusion joining). 3 is a movable clamp (vise) that clamps the elbow E; clamp 2,
3 has two split rings 4a and 4b. One of the two split rings 4b is formed integrally with the vise body, and the other ring 4a has a pivot pin 20 (FIG. 3) attached thereto.
It is pivoted so that it can expand. split ring 4
The pipe P and elbow E are sandwiched between a and 4b, and the pipe is clamped by tightening the female screw 7 with a handle that is screwed into the male thread 6 provided on one side 4b of the split ring. The clamp ring 4a can be opened to the other side (back side in the drawing) by loosening the screw 7 and tilting it forward in FIG.

One of the fixed clamps 2 and 3 is fixed to the machine bed 1, and the other movable clamp 3 has a slider 9 integrated with its lower part 4b that slides along a pair of parallel guide rods 10 and 10. Can be installed freely. That is, the clamp 3 constitutes a carriage that approaches and moves away from the clamp 2. The guide rods 10, 10 extend parallel to the pipe axis and are fixedly held by a bracket 11 provided on the machine base 1.

For example, a rectangular plate-shaped heater (not shown) is placed between the clamps 2 and 3 when necessary, and heats and melts the joint end surfaces of the pipe P and elbow E by pressing them against the heater face of the heater.

A pressurizing mechanism for pressing the movable clamp 3 toward the fixed clamp 2 has a support arm 70 rotatably pivoted to the machine base 1 by a pin 25. The pin 25 is rotatably supported by the machine base 1 and extends in a direction perpendicular to the pipe axis. The pin 25 therefore rotates together with the support arm 70. An identical link arm 27 is provided at the center of the pin 25 to face each other. These link arms 27 are connected to guide rods 3 extending in the pipe axial direction from the center of the movable clamp 3.
A pin 35 is attached to a presser 33 that is slidably inserted into
are relatively movably connected via. (Figure 2).
The guide rod 31 is inserted into a cylinder 41 which is fixed to the movable clamp 3. The guide rod 31 may be immovably fixed to the movable clamp 3 or the cylindrical body 41, but it may also be fixed to the cylindrical body 41 with a screw 32 formed at its tip so that its relative position can be adjusted. A part (tip end) of the presser 33 is slidably fitted into the cylinder 41 , and a press spring 44 is connected to the guide rod 3 between this tip and the movable clamp 3 .
It is arranged so as to wrap around one circumference. Therefore, the rotation of the arm 27 is converted into a linear sliding movement of the pusher 33. For example, if the support arm 70 is rotated clockwise in FIG. Pressure can be applied.

Incidentally, since the internal structure of the pressurizing mechanism itself is not directly related to the present invention, further detailed explanation will be omitted.
(Details are disclosed in the specification of Utility Model Application No. 58-2163).

The pressure is applied when the end face of the elbow E and the end face of the pipe P are pressed against the heater face of the heater placed between them, and when the heater is removed after heating and the end face of the elbow E and the end face of the pipe P are pressed directly to melt the end face of the pipe P. It is added to the movable clamp 3 when it is installed. The pressing force is obtained by rotating the operating lever 22 attached to the support arm 70 in the direction of the arrow in FIG. However, there is no problem when the end surfaces of pipes are fused together, but when the elbow E is fused as shown in the figure, when the bent end E' of the elbow E extends in a direction perpendicular to the pipe axis, the end E' This has the disadvantage that it interferes with the rotational movement of the operating lever 22, making it impossible to obtain a predetermined pressing force.

In order to solve this problem, according to the present invention, an additional support arm 70' is provided for mounting the operating lever 22 in a position that does not interfere with the elbow E. The support arm 70' is pivotally connected to the machine base 1 by a pivot pin 71. Support arm 70' is also connected to support arm 70 by link 73 via pivot 75. The support arm 70 is also pivotally connected to the link 73 by a pivot 72,
The support arms 70, 70' and the link 73 thus constitute a parallel link mechanism, and both support arms 70, 70' move in exactly the same way.

According to the invention, the operating lever 22 is easily and removably attached to the end rod 78, 78' of the support arm 70 or 70'. When the operating lever 22 is attached to the support arm 70', it is located on the right side of the bent end E' of the elbow E in FIG. 1 so as not to interfere with the bent end E'. The number and position of support arms 70' are determined appropriately depending on the size and type of joint members to be fused. For example, the operating lever 22 has a groove 83 formed at its lower end, and supports arms 70, 70'.
Although it is possible to simply fit the lock pin 91 into the tip rod 78, 78', it is preferable to fit the lock pin 91 from the outside of the operating rod 22 into the horizontal hole 93 formed in the tip rod 78, 78' to prevent the operating rod from coming off. do. A set screw may be used instead of the lock pin 91. Further, instead of forming the groove 83, the operating lever 22 may be formed by a hollow pipe with an inner diameter corresponding to the outer diameter of the support arms 78, 78'.

In FIG. 2, reference numerals 54 and 56 are a scale plate and a pointer for setting the spring load of the spring 44 of the pressure mechanism.

Effects of the invention By configuring as described above, the operating lever 2
2 can be easily attached to one of the suitable support arms as required, thus making it possible to conventionally fuse pipes together or oriented them in a particular direction (e.g. when installing with the bent end facing upwards). The butt fusion machine, which was previously applicable only to fusion of members only, can be used regardless of the direction in which the joint members are attached.

[Brief explanation of the drawing]

1 is a front view schematically showing a butt fusion machine according to the present invention, FIG. 2 is a partially sectional plan view of FIG. 1, and FIG. 3 is a left side view of FIG. 1. 1... Machine base, 2... Fixed clamp, 3... Movable clamp, 10... Guide rod, 22... Operation lever, 70, 70'... Support arm.

Claims (1)

[Scope of utility model registration request] A machine base having a guide rod extending in the axial direction of the pipes to be welded, and a fixed clamp that is held so as to be able to approach and separate from each other along the guide rod and grips the pipes to be butt welded or the pipes and the joint member. and a movable clamp, and an actuation lever mechanism connected to the movable clamp and manually applying a pressing force to the movable clamp, the actuation lever mechanism having a plurality of support arms pivotally connected to the machine base and forming a parallel link mechanism. and an operating lever that is detachably attached to any supporting arm, and at least one of the supporting arms is positioned so that when the operating lever is attached to the operating lever, it does not interfere with the joint member held by the movable clamp. A butt fusion machine characterized in that: