JPS6232830Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is a pipe joint fusion machine that fuses resin (e.g. polyethylene) pipe joints such as sockets, cheeses, elbows, etc. to similar resin pipes; In particular, the present invention relates to a liner combination structure incorporated into a device for clamping pipes and pipe fittings.

In recent years, resin pipes such as polyethylene have been increasingly used as gas pipes in place of conventional metal pipes. The resin pipes are connected to each other by heat fusion through resin pipe joints such as sockets, elbows, tees, or saddles. That is, when an elbow is fused to a tube, for example, a method is used in which the joint surfaces of the tube and the elbow are heated and melted using a heater, and the heated and fused surfaces are crimped together under a predetermined pressure. The thus crimped tube and elbow are allowed to cool for a certain period of time and are then completely integrated into one piece. A pipe joint fusion splicer is generally used for such connection work.
Such a pipe fitting fusion splicer basically has a pipe clamping device for clamping the pipe and a pipe fitting clamping device for clamping the pipe fitting, and both of these clamping devices are moved close to each other by a pair of parallel guide rods. Releasably connected.

BACKGROUND OF THE INVENTION Liners are utilized in such pipe fitting fusion machines to allow the same fusion machine to be applied to pipes or pipe fittings of several different outside diameters. Each liner consists of two semicircular rings with an inner diameter that corresponds to the outer diameter of the pipe or pipe fitting to be fused, and by fitting these rings into the clamping device, the diameter of the clamping device can be adjusted. Adjust. However, conventional liners can only be applied when, for example, the length of the elbow in the axial direction remains unchanged and only the diameter is reduced. In the case of an elbow whose axial length decreases as the diameter decreases, the fused tip of the elbow is buried in the liner, and the fused tip of the elbow is exposed from the front of the liner. This is because the pipes do not protrude and pipe fusion cannot be performed. Specifically, for example, a 75mmφ pipe and a 50mmφ pipe.
Since the elbows for 30mmφ pipes differ only in diameter, the same fusion machine can be used if liners with different inner diameters are used, but the elbows for 30mmφ pipes are not only smaller in diameter but also longer in the axial direction than the elbows for 50mmφ pipes. The same fusion machine could not be used because the size would also be smaller.

Purpose of the invention In order to solve the above-mentioned problems, the present invention improves the structure of both the pipe liner and the pipe fitting liner, so that a single pipe can be used for pipes and pipe fittings of various sizes. The purpose is to enable fusion to be performed using a joint fusion splicer.

Structure of the invention In order to achieve the above-mentioned objects, according to the present invention, the liner to be attached to the pipe clamping device has a reference contact surface for the pipe fitting protruding from the side surface of the pipe clamping device; The liner to be attached to the pipe has a thickness such that the crimp end of the pipe fitting can protrude from the liner toward the reference plane during the crimp operation.

Example The embodiments shown in the drawings will be described below.

The pipe joint fusion splicer shown in FIGS. 1 to 4 basically comprises a pipe clamp device 10 for clamping a pipe P and an elbow clamp device 50 for clamping an elbow E. These two clamp devices are connected by a pair of parallel guide rods 3 provided on the machine base 1 so that they can approach and separate from each other. The pipe clamp device 10 is composed of a pair of fixed clamp half parts 13 and a movable clamp half part 15 that can be divided into two parts about a pivot 11, and the fixed clamp half part 13 is attached to the guide rod 3.
It is slidably mounted on the Both clamp halves 1
3 and 15 are tightened and fixed by clamp bolts 17 at positions facing the pivot 11 in the diametrical direction. One end of the clamp bolt 17 is connected to the fixed clamp half body 13, and by rotating the clamp knob 19, the movable clamp half body is pressed by the clamp knob 19, and both clamp halves can be tightened. A heater receiver 2 is provided on the movable clamp half 15 to receive a heater 100, which will be described later.
1 is provided. In addition, 23 is the tube clamp device 10
This is the handle used when moving the lever toward the elbow clamp device 50.

The elbow clamp device 50 is also the tube clamp device 10.
Similarly, it is composed of a pair of fixed clamp half parts 53 and a movable clamp half part 55 that can be divided into two parts around a pivot pin 51. The movable clamp half body part 55 and the fixed clamp half body part 53 are connected to the pivot pin 51
are removably connected by a torque tightening device 70 on the diametrically opposite side.

The elbow clamp device 50 is also provided with a handle 63 for moving it towards the tube clamp device 10. The movable clamp half 55 is provided with a heater receiver 56 similar to the heater receiver 21 of the tube clamp device 10.

The torque tightening device 70 for controlling the tightening force for clamping the elbow E to a predetermined value is not directly related to the present invention, so its explanation will be omitted.

In addition, before fusing the elbow E and the pipe P, a heater 100 having a heater face 101 of a predetermined shape is mounted on the heater receivers 21 and 56 in order to heat and melt the inner peripheral end face of the elbow E and the outer peripheral end face of the pipe P. be placed. If the elbow E and the pipe P are strongly pressed (fitted) against the heater 100 from both sides, and after a predetermined time elapses, the heater 100 is removed and the pipe P is directly pushed into the elbow E (Fig. 5), the elbow E is fused to the pipe P. Ru.

In the pipe joint fusion splicer as described above, the liners 40 and 6 are attached to the inner diameter portions of the pipe clamp device 10 and the elbow clamp device 50 according to the outer diameters of the pipe P and the elbow E.
0 is inserted. That is, in practice, for example, by adjusting the inner diameters of the pipe clamp device 10 and the elbow clamp device 50 to the maximum standard of the intended pipe and elbow (e.g. pipe diameter = 75 mmφ), the maximum diameter pipe can be obtained. When fusion-bonding the pipe and elbow, the pipe and elbow are directly held by their respective clamping devices without using a liner, and the pipe and elbow are fused together with a smaller diameter (e.
When g.50mmφ) pipe and elbow are fused together, a liner of the corresponding diameter is fitted into both clamp devices. Here, the conventional liner is a plate having the same thickness as the width WW ₁ , W ₂ (FIG. 1) of the respective clamp devices 10 , 50 . Therefore,
The front surface 61A and rear surface 61B of the liner 60 are located on the same plane as the front surface 52A and rear surface 52B of the elbow clamp device 50. The rear surface 61B of the liner, and therefore the rear surface 52B of the elbow clamp device 50, is connected to the elbow E.
It forms a positioning reference plane when welding the pipe p to the pipe p. That is, by pressing one arm of the elbow E against this positioning reference surface as shown in FIG. 5, the amount of protrusion a ₁ from the front surface 61A of the liner 60 is
is uniquely determined. On the other hand, pipe P has pipe liner 4
0 by a predetermined amount. As a result, by inserting the tube P into the elbow E until the distal end surface 64 of the elbow E comes into contact with the opposed front end surface 40A of the tube liner 40, the insertion length of the tube P is always constant and fusion can be performed in accordance with the standard. It is something.

By the way, for elbow E, even if the diameter D ₁ decreases, the arm length l ₁ remains unchanged (for example, an elbow for a 75 mmφ pipe and an elbow for a 50 mmφ pipe), and the length of l ₁ decreases as the diameter decreases. (e.g. 50mmφ
There are elbows for pipes and elbows for 35mmφ pipes.
In the former case, it is sufficient to simply replace the liners 40 and 60 with smaller inner diameters, but in the latter case, simply reducing the liner diameter is not applicable. This is because, as shown in Fig. 6, if the diameter D ₂ of the elbow E' and the arm length l ₂ are smaller than those shown in Fig. 5 (D ₁ >
D ₂ , l ₁ >l ₂ ), the distal end surface 64 of the elbow E' no longer protrudes outside from the distal end surface 61A of the liner 60 and is buried within the liner 60 (l ₂ <t ₁ ). Therefore, in this state, even if an attempt is made to insert the pipe P into the tip of the elbow E', the front end surface 40A of the pipe liner 40
interferes with the front end surface 64A of the liner 60 and cannot be brought into contact with the tip end surface 64 of the elbow E'. As a result, the insertion length of the pipe P is the specified length (standard length)
It becomes smaller than.

Therefore, the present invention is based on the thickness of the liner 60' for the elbow.
As shown in FIG. 7, t ₂ is made smaller than the width W ₂ of the elbow clamp device 50 (t ₂ <t ₁ =W ₂ ), and the liner 6
Predetermined protrusion length of elbow E' from front end surface 61A' of 0'
I try to secure a ₁ . As shown in FIGS. 8 and 9, the liner 60' is formed from two semi-annular half sections 67 having substantially the same shape, and when these two half sections 67 are combined, an inner diameter section corresponding to the outer diameter of the elbow is formed. be done. One of the halves 67 simply rests on the fixed clamp half 53 and the other half 67 is attached to the movable clamp half 55. A half part 67 attached to the movable clamp half part 55 has a protrusion 6 fitted with an O-ring 71 at its top.
9 is provided, and this protrusion 69 is fitted into a corresponding groove 58 (FIG. 1) formed in the movable clamp half 55 to prevent it from falling out of the movable clamp half 55. Note that the O-ring 71 plays a role as a fall prevention member. Half body part 67
The inner diameter of the is preferably provided with anti-slip knurls 6.
6 is applied.

The liner 40 for the pipe P has two semi-annular half portions 47 (numbers 10 and 11) of substantially the same shape as the liner 60.
According to the present invention, the liner 40
The elbow clamp device 50 has a projection 44 that can fit into the inner diameter of the elbow clamp device 50.
The protrusion 44 has a reference contact surface 44A against which the tip surface 64 of the elbow clamp device 50 contacts in response to the thinning of the plate thickness of the liner 60.
The reference contact surface 44A of the elbow
Pipe P is inserted into the elbow until it abuts against the tip surface 64 of E'.
By inserting the pipe P into the pipe clamp device 10, the insertion length of the pipe P can be adjusted to a predetermined standard value in the same manner as in the conventional case.
The diameter of the projection 44 is equal to the diameter of the tip surface 64 of the elbow E'.
The size is such that it can make surface contact over the entire circumference and can enter the inner diameter portion of the elbow clamp device 50.

Effects of the invention As described above, according to the invention, the liner on the elbow side is made thinner than the width of the elbow clamp device, so that the tip of the elbow protrudes from the tip surface of the liner toward the pipe, and the liner on the pipe side By providing a protrusion that can fit into the inner diameter of the clamp device and forming a reference surface on which the elbow end surface comes into contact with the protrusion, the same welding machine can be applied to elbows of various sizes.

Although the above explanation has been made using an elbow as an example of a pipe joint, it goes without saying that the present invention can also be applied to sockets, cheese joints, or other pipe joints.

[Brief explanation of the drawing]

Figure 1 is a front view showing the overall structure of a pipe fitting fusion machine incorporating a liner according to the present invention, and Figure 2 is a
Figure 3 is the left side view, Figure 3 is the right side view of Figure 1, and Figure 4 is the right side view of Figure 1.
The figure is a plan view of Figure 1, Figures 5 and 6 are diagrams for explaining the positional relationships between elbows of different sizes and liners, and Figure 7 is a plan view of the elbow shown in Figure 6. 6, FIGS. 8 and 9 are front and bottom views of the half body of the elbow liner according to the present invention, and FIGS.
0 and 11 are a front view and a bottom view of a half part of the tube side liner according to the present invention. 3...Guide rod, 10...Pipe clamp device, 40
...Tube side liner, 44A...Reference contact surface, 50...
...Pipe joint clamp device, 60...Pipe joint side liner.

Claims (1)

[Scope of utility model registration request] A pipe clamp device having an inner diameter portion for holding a pipe and a pipe fitting clamp device having an inner diameter portion for holding a pipe joint are connected so as to be able to approach and separate from each other by a guide rod extending between the two clamp devices. A liner used in a pipe fitting fusion machine that presses and fuses a pipe fitting against a pipe by moving one side of the clamping device toward the other, the reference contact for a pipe fitting protruding from the pipe clamping device. A pipe liner to be fitted into the inner diameter of a pipe clamping device having a surface, and a pipe liner to be fitted into the inner diameter of a pipe fitting clamping device having a plate thickness such that the crimping tip of the pipe fitting protrudes toward the reference contact surface during crimping. A combination of a liner for a pipe fitting fusion splicer and a liner for a pipe fitting to be fitted.