JPS625783B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a butt welding device used for butt-joining synthetic resin pipes made of vinyl chloride resin, polyethylene resin, etc.

(Prior Art) Conventionally, this type of butt welding apparatus is known in which a fixed clamp and a movable clamp are arranged on a base, and the movable clamp is moved by the operation of a hydraulic cylinder. .

When butt-joining synthetic resin pipes, the synthetic resin pipes are held in a fixed clamp and a movable clamp, the end faces of each synthetic resin pipe are chamfered, and the end faces of each pipe are pressed against a hot plate and heated and melted. Then, the end surfaces of the molten tubes were butted together and welded and joined.

(Problems to be Solved by the Invention) However, in conventional welding devices, the moving and pressing operations of the movable clamp were performed by operating a hydraulic cylinder, so the end face of the synthetic resin pipe was pressed against the hot plate. There was a problem in that it was difficult to finely adjust the pressing force by the hydraulic cylinder when melting or butting and joining the molten end surfaces of the tubes.

Furthermore, if the operating mechanism of the movable clamp is hydraulic, the weight of the entire device increases and it is inconvenient to carry, making it unsuitable for on-site piping construction.

(Means for Solving the Problems) The present invention solves all of the problems of the conventional device at once, and is a method of disposing a fixed clamp 2 and a movable clamp 3 on a base 1 so as to face each other. At the same time, the movable clamp 3 is movable while being guided by a guide shaft 11 extending over the base 1,
Further, a torque wrench 4 having an elastic force for moving the movable clamp 3 toward the fixed clamp side and applying a pressing force is pivotally supported on the lower part 31 of the movable clamp 3, and a torque pointer 4 is mounted on the pivot.
On the other hand, a torque display plate 41 is provided on the top of the torque wrench 4 for reading the amount of deflection of the torque wrench 4 with the torque pointer 42, and a lock mechanism 5 is provided for maintaining the pressing force of the torque wrench 4. To provide a butt welding device which is characterized by being provided across the upper end of a torque wrench 4 and a base 1, allowing easy movement and pressing operations of a movable clamp, and which is lightweight and convenient to carry. It is something.

(Example) Hereinafter, a specific configuration of the present invention will be described in detail based on an example.

FIG. 1 is a partially cutaway front view of a butt welding device showing an embodiment of the present invention, in which reference numeral 1 is a base, 2 is a fixed clamp, 3 is a movable clamp, 4 is a torque wrench, and 5 is a The lock mechanism, H is a hot plate, C is a rotary beveling machine, and P is a synthetic resin pipe.

The fixed clamp 2 and the movable clamp 3 are connected to the base 1
The fixed clamps 2 are arranged facing each other on the top.
is fixed to the base 1, and the movable clamp 3 is guided by a guide shaft 11 extending over the base 1 so as to be movable.

The pipe holding parts of the fixed clamp 2 and the movable clamp 3 have a half-split structure divided into upper and lower halves, one end of which can be opened and closed by a pin connection, and a lock provided at the other end. A mechanism (not shown) allows the outer circumferential surface of the synthetic resin pipe P to be securely held by each half member.

In addition, a pressing force is applied to the opposite ends of the clamps 2 and 3 to the outer wall of the end of the held synthetic resin pipe P to correct the end of the pipe to be butt-jointed into a perfect circle. Adjustment bolts 20, 30 are provided.

The torque wrench 4 is made of elastic steel or the like, and the lower end of the torque wrench 4 is pivotally supported by the lower part 31 of the movable clamp 3, and a torque pointer 42 is provided on the pivot. Said moving clamp 3
The pipe holding part and the lower part 31 are slidably connected, and even when the lower part 31 is fixed to the slide shaft 11, the pipe holding part can be moved by rotating the torque wrench 4 toward the fixed clamp side. It is designed to protrude toward the fixed clamp side. 41 is a torque display plate provided on the upper part of the torque wrench 4, and when the torque wrench 4 is rotated to apply a pressing force to the movable clamp 3, the amount of deflection is read with the torque pointer 42. , you can check the pressing force.

On the other hand, the lock mechanism 5 is for maintaining the pressing force of the torque wrench 4, and has one end that is pivotally supported by the upper end of the torque wrench 4, and the other end that can be fixed to the base 1. ing.

The butt welding apparatus of the present invention has the above-mentioned configuration, and the process of welding pipes together using this apparatus will now be described with reference to FIG.

First, each synthetic resin pipe P is fixed to the fixed clamp 2 and the movable clamp 3. At this time, the end of the synthetic resin pipe P is made to protrude slightly from the side surface of the clamp.

Next, the movable clamp 3 is moved to a predetermined position, and the lower part 31 is set on the guide shaft 11 using a bolt (not shown). Adjustment bolts 20 and 3 provided on the fixed clamp 2 and the movable clamp 3
0 to apply a pressing force to the outer wall of the tube end, and straighten the tip of the synthetic resin tube P held by each clamp into a perfect circle.

After correcting the tip of the synthetic resin pipe P held by each clamp into a perfect circle in this way, the rotary chamfering machine C is set between the fixed clamp 2 and the movable clamp 3, and the rotary chamfering Machine C is rotated to cut the tube end surface and chamfer the inner surface of the tube end.

Thereafter, the rotary chamfering machine C is removed, and a hot plate H is interposed between the fixed clamp 2 and the movable clamp 3. Then, the torque wrench 4 is rotated to cause the synthetic resin pipe P held by the movable clamp 3 to protrude toward the fixed clamp side, and the end surfaces of the synthetic resin pipes P and P are brought into contact with both surfaces of the hot plate H.

In this way, from the state where the tube end surface is in contact with the hot plate H, the torque wrench 4 is further rotated, and while reading the pressing force of the torque wrench 4 on the torque display plate 41, a predetermined pressing force is applied to the hot plate H. is applied, and the elastic deformation of the torque wrench 4 is fixed by the lock mechanism 5. When the end face of the synthetic resin pipe P comes into pressure contact with the hot plate H and gradually melts, this molten resin is pushed in and out of the pipe end face, so the pressing force of the torque wrench 4 decreases, but the torque wrench 4 has elasticity. Because power is given,
The end face of the synthetic resin pipe P is melted while being pressed against the hot plate H.

Therefore, the locking mechanism 5 is released, the torque wrench 4 is rotated in the opposite direction, the hot plate H is quickly removed, the torque wrench 4 is rotated again, and the synthetic resin pipe P held in the movable clamp 3 is fixed on the side of the clamp. It is made to protrude and pressed against the end face of the synthetic resin pipe P held by the fixed clamp 2 with a predetermined pressing force.

Of course, when butt-joining the tubes, the pressing force is applied while reading the pressing force of the torque wrench 4 on the torque display plate 41 in the same manner as described above, and this pressing force is maintained by the locking mechanism 5 and held for a predetermined time. do.

In this way, the synthetic resin pipes held by the fixed clamp and the movable clamp are firmly welded together.

Incidentally, in the above embodiment, the movable clamp 3 is illustrated in which the tube holding part and the lower part 31 are constructed as separate bodies.
The present invention is not limited to this configuration, and may take various configurations without departing from the gist of the present invention.

For example, the tube holding part and the lower part 31 may be formed into an integral structure, and when the torque wrench 4 is rotated by employing a conventionally known or well-known lever mechanism, ratchet mechanism, etc., the entire movable clamp 3 can be moved to the fixed clamp side. It may also be possible to apply a pressing force while moving it.

(Operations and Effects of the Invention) As described above, the butt welding device of the present invention has a fixed clamp and a movable clamp disposed on the base to face each other, and the movable clamp has a movable clamp that moves toward the fixed clamp side. A torque wrench that applies a pressing force, a torque indicator and a torque display plate are provided to read the pressing force of the torque wrench, so it is easy to use when pressing the tube ends against the hot plate or when pressing the molten tube ends together. A desired pressing force can be immediately applied when butt-joining the parts, and the pressing force can also be finely adjusted extremely easily. In addition, the torque wrench
A locking mechanism that spans the top end of the torque wrench and the base allows a constant pressing force to be applied continuously.
An extremely strong welded joint can be obtained.

Further, the device of the present invention can move and move the movable clamp.
Because the pressing operation is manual with a torque wrench, the structure is simple, and it is much lighter than conventional hydraulic welding equipment, making it convenient to carry and extremely suitable for on-site piping construction. It is.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of a butt welding device showing one embodiment of the present invention. 1...Base, 11...Guide shaft, 2...Fixed clamp, 3...Moving clamp, 4...Torque wrench, 41...Torque display plate, 42...Torque pointer, 5...Lock mechanism, C ...Rotary chamfering machine, H...
...Hot plate, P...Synthetic resin pipe.

Claims (1)

[Claims] 1 A fixed clamp 2 for holding a synthetic resin pipe on a base 1 and a movable clamp 3 are disposed facing each other, and the movable clamp 3 is guided by a guide shaft 11 extending across the base 1. movable and without,
Further, a torque wrench 4 having an elastic force for moving the movable clamp 3 toward the fixed clamp side and applying a pressing force is pivotally supported on the lower part 31 of the movable clamp 3, and a torque pointer 4 is mounted on the pivot.
On the other hand, a torque display plate 41 is provided on the top of the torque wrench 4 for reading the amount of deflection of the torque wrench 4 with the torque pointer 42, and a lock mechanism 5 is provided for maintaining the pressing force of the torque wrench 4. A butt welding device characterized in that it is provided across the upper end of a torque wrench 4 and a base 1.