JPS6110978Y2 - - Google Patents

Description

[Detailed description of the invention] This invention can grip and fusion-bond various synthetic resin pipes, from small diameter pipes to large diameter pipes, and
In particular, the present invention relates to a butt fusion device that can perform good fusion bonding while correcting roundness by gripping a position close to the end surface of the tubes to be fusion bonded with a liner when joining small diameter synthetic resin pipes together.

Conventionally, as this type of butt fusion device, the one shown in FIG. 1 has been known. This fusion device has a fixed clamp 2 and a movable clamp 3 mounted on a machine base 1 at a predetermined distance from each other, and the end face of a synthetic resin pipe P fixed to each clamp is pressed against a heater H to melt it. After that, the lever 4 is swung in the direction of the arrow to bring the movable clamp 3 close to the fixed clamp 2 and join the molten surfaces against each other, but it cannot be used for fusion joining synthetic resin pipes with different diameters. There was a drawback. That is, when using a synthetic resin pipe of a different size, it is necessary to replace the fixed clamp and the movable clamp with a clamp that matches the diameter of the pipe, which is a cumbersome task.

The present invention is an attempt to improve such conventional equipment, and its gist is that a fixed clamp and a movable clamp are installed opposite each other at a predetermined interval on a machine base, and a synthetic resin tube is gripped by each clamp. In a butt fusion device for butt-joining by melting the end faces of the fixed clamp and the movable clamp, the fixed clamp and the movable clamp have a half-split structure, and inside thereof there is a fitting fitting that fits the outer circumferential surface of synthetic resin pipes with various outer diameters. In addition to loading multiple liners with surfaces in a removable manner,
The butt fusing apparatus is characterized in that each liner loaded in at least one clamp is configured to be able to protrude toward the opposing clamp side.

That is, the present invention grips synthetic resin pipes of various sizes to be fusion-bonded through a liner that matches the diameter of the pipe, and the liner protrudes from the clamp and grips the pipe at a position close to the end surface of the pipe. Fusion joining can be performed while correcting the roundness of the pipe, and the work space between the fixed clamp is widened to check roundness, check the molten state with a heater, and check the quality of beads that occur at the butt part. The object of the present invention is to provide a butt fusion device that can quickly and accurately perform a series of fusion operations such as the following.

An embodiment of the clamp structure, which is a feature of the present invention, will be described below with reference to the drawings.

FIG. 2 is a front sectional view of the fixed clamp, and FIG. 3 is a partially cutaway side view, in which 2 is a fixed clamp;
5 is a liner, 6 is a tightening fixture, and P is a synthetic resin pipe.

The fixed clamp 2 consists of half bodies 21 and 22, one end of which is mutually pivotally supported by a pin 7, and a tightening fixture 6 provided at the other end. That is, one half body 21 is provided with a flange 211, and the other half body 22 is provided with a flange 211.
A protrusion 221 is provided protrudingly provided on the protrusion 221, a gate-shaped metal fitting 61 is rotatably supported on the protrusion 221, and a bolt 62 screwed into the upper side member can be pressed against the upper surface of the flange 211 to fix it. do it like this.

On the inside of the half bodies 21 and 22, there are fitting surfaces 511 and 52 that are compatible with the outer peripheral surfaces of synthetic resin pipes of various sizes.
Liners 51, 52, and 53 having numbers 1,531 are sequentially removably loaded. Each liner has a dovetail groove on the mating surface, and the liner loaded inside this
A protrusion provided on the outer circumferential surface is fitted into the dovetail groove to be movable in the tube axis direction, and is configured to be fixed with a bolt (not shown).

When gripping synthetic resin pipes with fixed clamps and movable clamps for fusion bonding, it is necessary to grip as close to the pipe end surface as possible in order to correct the roundness of the pipe and prevent bending of the pipe end. However, as shown in Fig. 2, the device of the present invention can grasp the pipe end by protruding only the liner, so the work space between the clamps can be widened, and it is possible to check the roundness and use the heater. A series of welding operations such as checking the molten state and checking the quality of the bead that occurs at the butt part can be performed quickly and accurately.

Although the structure of the fixed clamp was described in the above embodiment, the movable clamp also has a structure in which a plurality of liners are sequentially and detachably loaded inside the half body, similar to the fixed clamp.
The butt fusion device of the present invention may have a structure in which each liner can protrude toward the opposing clamp side for either a fixed clamp or a movable clamp.

As described in detail above, the butt fusion device of the present invention grips synthetic resin pipes through the liner, so that it can fusion-bond various synthetic resin pipes from small diameter pipes to large diameter pipes. In addition, the liner protrudes from the clamp and can be gripped at a position close to the pipe end surface.
Fusion joining can be performed while correcting the roundness of the pipe, and the work space between the fixed clamp and the movable clamp can be widened, so it is possible to check the roundness, check the molten state with a heater, and butt joint. A series of fusing operations such as checking the quality of beats that sometimes occur can be done quickly.
Since it can be performed properly, it has great practical value.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway front view of the butt fusion device;
FIG. 2 is a front sectional view showing the fixing clamp of the present invention, and FIG. 3 is a partially cutaway side view. 1... Machine base, 2... Fixed clamp, 3... Moving clamp, 5... Liner.

Claims (1)

[Scope of utility model registration request] In a butt fusion device in which a fixed clamp and a movable clamp are installed opposite each other at a predetermined distance on a machine base, and the end faces of synthetic resin pipes gripped by each clamp are melted and butt-joined, the fixed clamp and the movable clamp are has a half-split structure, and inside thereof, a plurality of liners with fitting surfaces that fit the outer peripheral surfaces of synthetic resin pipes with different outer diameters are sequentially and removably loaded, and at least one clamp is attached. A butt fusing device characterized in that each liner loaded in the butt fusion device is configured to be able to protrude toward opposing clamp sides.