JPS6224510Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a synthetic resin pipe with a synthetic resin socket, etc. (here, socket, etc. refers to socket, cap,
This invention relates to a center depth gauge that determines the centering and joining depth between a synthetic resin pipe and a socket, etc. when welding joints such as elbows, cheeses, etc.

Traditionally, metal pipes have been used as pipes for city gas, but medium-density polyethylene pipes have appropriate rigidity and flexibility as pipes for city gas, and unlike metal pipes, they have the problem of underground corrosion. It has the excellent property of being able to be used semi-permanently.

To join a socket, etc. to a polyethylene pipe, heat the joined part of the polyethylene pipe and socket with a heater to melt it, then engage the joined part of the two and press it with a constant pressure, and then press it with a constant pressure. The materials were left for a certain period of time to cool and solidify, and then melted and joined.

By the way, the conventional fusion splicer used to join this type of pipe and socket etc. did not have a special gauge, so the fusion splicing operation was inefficient. In addition, even if the tube was equipped with a centering gauge, the gauge had not been specially devised, so if there were dimensional errors or distortions in the tube,
The inner surface of the gauge had to be cut to accommodate dimensional errors and distortions, which was extremely troublesome. Instead of cutting the inner surface of the gauge, it may be possible to prepare a large number of gauges of different sizes, but this method has drawbacks such as high equipment costs and troublesome management.

In order to eliminate these drawbacks, we have developed a fusion splicer that is equipped with a gauge that allows centering even if there is a slight error in the diameter of the tube or even if the tube is slightly distorted, as well as a gauge that can determine the joining depth. As a centering gauge for
A center depth gauge made of metal such as aluminum is known, which has a part into which a synthetic resin tube is inserted and a part into which the socket is inserted while being in contact with the inner peripheral surface of the socket.

However, in the case of such conventional center depth gauges made of metal such as aluminum, because the gauge is made of metal, it is difficult to use synthetic resin tubes and As the synthetic resin socket expands, the gap between the socket and the gauge part expands at the part where the socket opening is inserted, making it difficult to accurately determine the center of the socket. In some areas, the problem is that the tube cannot be inserted into the gauge due to expansion of the tube.

On the other hand, in winter, on the other hand, the part where the socket is inserted will shrink due to shrinkage of the socket.
It becomes difficult to insert the socket opening into the gauge, and on the side where the tube is inserted, due to contraction of the tube, the gap between the insertion part of the gauge tube and the outer diameter of the tube increases, and the center of the tube does not come out. There was a problem.

This idea was created by focusing on these conventional problems, and solved the above problems by making the center depth gauge made of plastic, which is almost the same material as synthetic resin pipes and sockets. The purpose is to

Although the present invention can be implemented when a socket etc. is fused to a synthetic resin pipe, the following Figures 1 to 4 illustrate the case where a synthetic resin socket is fused to a synthetic resin pipe. Explain with reference to.

In the figure, 2 is a clamp that holds a polyethylene pipe as a city gas conduit, and 3 is a clamp that holds a polyethylene socket.
3 has two split rings 4a and 4b, one of which is fixed, the other 4b is pivotally connected to it by a ring 5, and one clamp 2
The pipe is sandwiched between the split rings 4a and 4b of the other clamp 3, the socket is sandwiched between the split rings 4a and 4b of the other clamp 3, and the split ring is attached to the female threaded pipe 6 connected to one of the split rings 4a. By screwing together the male screw 7 with a handle that engages with the other 4b, the pipe and socket are pressed and held.

The clamp 2 that clamps the tube is fixed, and a slide bearing 8 is provided at the bottom of the clamp 3 that clamps the socket.
6, 16 towards the fixed clamp 2.

A gripping rod is provided for moving and pressing the movable clamp 3 that clamps the socket toward the fixed clamp 2 that clamps the pipe. That is, the clamp 2 on the fixed side that clamps the pipe is provided with a lever 9 that protrudes perpendicularly thereto, and the clamp 3 on the movable side that clamps the socket is provided with a lever 9 that protrudes orthogonally thereto and is interconnected. Three gripping rods 10, 11, and 12 each having an L-shape formed by connecting lines are rotatably connected at the central gripping rod 10. The gripping rod 9 and the gripping rods 10, 11, 12 are normally provided on both sides of each clamp 2, 3. Further, the movable clamp 3 that clamps the socket is provided with a lock knob 13 for fixing it.

Although not shown, the height of the clamp 3 can be adjusted with respect to a heater bracket, which will be described later. Further, instead of adjusting the clamp 3, the heater bracket may be adjusted in the vertical direction.

The heater 17 is suspended from a heater bracket 18 and can be moved within a range of 360 degrees in the horizontal direction. Also, heater bracket 1
There is a gap t between the lower end of 8 and the upper end of hanging part 17'.
is formed, and the heater 17 can be moved to some extent in the vertical direction relative to the bracket 18.

Since the heater is unnecessary after heating and melting the tube and socket, it can be moved from the heating and melting position shown in FIG. 1 to another position where it will not interfere with the joining of the tube and socket. Movement to other positions can also be accomplished by removing the heater from the heater receivers 15, 15, which are provided at the top of the clamps 2, 3 together with the heater bracket 18, as shown.

Since the heater is for heating purposes, it cannot be used for centering pipes, sockets, etc., so a centering gauge is used in the present invention. This gauge also regulates the joining depth of the pipes. In other words, it also functions as a depth gauge.

The center depth gauge 30 is connected to the heater 17
It has a similar shape and is approximately the same size.

As shown in FIG. 4, the center depth gauge 30, which also serves as a depth gauge, has a first part 32 inserted into the socket 31 with the inner circumferential surface of the socket 31 in contact with the outer circumference of the end of the tube 33. and a second portion 34 inserted with their surfaces in contact.
The inner diameter of the second portion into which the tube is inserted is tapered from the inlet end toward the terminal end, and a viewing window 36 is formed near the terminal end, allowing you to check whether the tube 33 is completely inserted. It is now possible to confirm.

The viewing window has the distal end of the tube at the bottom 35 of the second section.
The bottom part 39 of the second part is located in the middle part of the viewing window 36 so that it can be confirmed that the second part is in close contact with the viewing window 36. Note that the insertion depth H of the second portion of the tube is the joint portion of the tube, and this portion functions as a depth gauge.

That is, by bringing the tube-side end surface 37 of the center depth gauge 30 into which the tube has been fully inserted into close contact with the tube-side end surface 38 of the tube-side clamp 2, a specified insertion depth H is secured, and the tube and socket are fused together. Even if the center depth gauge is removed during this process, the insertion length H of the socket etc. is correctly ensured because the movement of the end face of the socket etc. is restricted by the end face 38 of the tube side clamp 2.

Next, a procedure for fusion-bonding a polyethylene pipe as a city gas conduit, a polyethylene socket, etc. using the above-mentioned fusion splicer will be explained.

First, insert the center depth gauge 30 into the tube end, and after confirming through the viewing window 36 that the tube end is in contact with the bottom 39 of the gauge 30, the end surface 37 of the gauge 30 is in contact with the end surface 38 of the tube side clamp 2. Clamp the tube in a tight position. Next, clamp the socket etc. to the socket-side clamp 3, move the clamp 3 to the clamp 2 side, and make sure that the inner surface of the socket is aligned with the gauge 3.
Check whether it fits snugly into the first part 32 of 0. If they do not fit, move the clamp 3 in a plane perpendicular to the plane of the paper to ensure a snug fit, and then fix the clamp 3 with the lock knob 13.

Next, remove the center depth gauge 30 and set the heater. Then, the outer surface of the end of the tube and the inner surface of the socket opening are heated and melted by the heater 17. Next, put your thumb on the gripping rod 9 provided on the clamp 2 that clamps the tube, and place your remaining fingers on one of the gripping rods provided on the clamp 3 that clamps the socket, for example, when the insertion length of the tube into the socket is determined. If it is relatively long, hang it on the gripping rod 11 and pull the clamp 3 holding the socket towards the clamp 2 holding the tube. At this time, use both hands to hold the gripping rods 9, 9 and 11, 1 on both sides of the clamps 2 and 3.
Grip 1 and pull it with even force. Then, a constant pressing force is maintained for a predetermined period of time to wait for cooling and fixation.
When the pipe and socket are completely joined, loosen the male screw 7 and remove the joined pipe and socket from the fusion machine.

If the insertion length of the tube into the socket is short, the gripping rods 11 and 12 are rotated 90 degrees, the fingers are placed on the gripping rod 12, and the above-mentioned operation is performed to fuse and join the tube and the socket.

Furthermore, if the insertion length of the tube into the socket is long, the gripping rod 10 is hooked with one's fingers to fusion-bond the tube and the socket.

The pipe and socket are joined in this way.According to the present invention, a center depth gauge made of plastic is used to center the pipe and socket, so it is easy to connect synthetic resin pipes and sockets in summer and winter. This solves the problems of the center depth gauge being unusable due to expansion and contraction, and the problem of poor welding at the connection point due to poor centering of the pipe and joint.

Additionally, the gauge 30 is provided so that the bottom 39 of the second portion of the gauge 30 is located in the middle of the viewing window 36, so that it can be confirmed through this window whether the tube is completely inserted. When set at the inserted position, the joining depth between the pipe and socket is defined. Therefore, the centering gauge according to the invention also functions as a depth gauge.

Furthermore, by using plastic as the material of the center depth gauge, when inserting the synthetic resin pipe and joint into the gauge, good fusion can be obtained without damaging the inner surfaces of the pipe and the joint.

Because the sizes of the fork pipe and the joint are within the maximum tolerance, even if the pipe fork or the joint is inserted with a force such as a hammer, there will be no burr on the end of the first portion 32 into which the socket is inserted. No damage to the inner surface of the joint due to burrs.

The plastic constituting the center depth gauge may be one that has a coefficient of thermal expansion approximately the same as that of synthetic resin pipes and fittings, but the molecular weight
Preferably, ultra-high molecular weight polyethylene of 200,000 or more is used.

The above explanation has been about fusion bonding of polyethylene pipes and polyethylene sockets as city gas conduits, but other synthetic resin pipes and synthetic resin sockets can also be fusion bonded for other purposes, such as water supply conduits. Of course, the present invention can also be implemented in such cases.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of the fusion splicer, Fig. 2 is a front view of the same, Fig. 3 is a plan view of the same, and Fig. 4 is a view of the center depth gauge. It is a front view. 2, 3... Clamp, 17... Heater, 18...
...Heater bracket, 30...Centering gauge, 3
1...Socket, 32...First part, 33...
Pipe, 34...Second portion, 36...Peep window, 37...
...End face of gauge, 38...End face of clamp, 39
...bottom of the gauge.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A fusion machine that heats and melts a synthetic resin pipe and a socket, etc. to engage them, and then waits for cooling and solidification to fusion-bond the pipe and socket, etc. The center depth gauge consists of a first part into which the socket etc. is inserted while contacting it, and a second part into which the pipe is inserted in contact with the first part. A center depth gauge for a fusion splicer, characterized in that the second part is made of plastic having a coefficient of thermal expansion approximately the same as that of synthetic resin pipes, sockets, etc. (2) A center for a fusion splicer according to claim 1 of the utility model registration claim made of ultra-high molecular weight polyethylene;
depth gauge.