JP2002364796A - Pipe gripper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe gripper used for gripper a resin pipe at the time of electric fusion of an elbow joint and the resin pipe and capable of simply carrying out a centering of the pipe and the joint at the time of fusion. SOLUTION: The pipe gripper 12 for gripping the resin pipe 11 inserted into the elbow joint 13 and a jig 16 provided with a curved part butted to a corner part of the elbow joint 13 from the outside are mounted to a base 5. The jig 16 supports the elbow joint 13 and carries out a positioning in the vertical and horizontal directions. The position of the jig 16 can be adjusted along a long groove 17 formed on the base 5 and the jig 16 can be removed and changed by removing a nut 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a socket-type electric fusion joint having a socket for a pipe such as a socket joint, an elbow joint or a cheese joint, and a resin pipe inserted into the socket of the joint. The present invention relates to a tube gripper used for gripping a tube when electro-fusing the pipes.

[0002]

2. Description of the Related Art In recent years, resin pipes have become widespread as water and sewage pipes and gas pipes, and in such piping work, electric fusion joints in which a heating wire is embedded in a joint surface with the pipe are frequently used as a joint for connecting the pipes. It has become so. According to this joint, the heating wire is heated by energization and the joint surface with the tube is heated and melted, so that fusion with the tube can be easily and reliably performed. In the case of socket joints, electrofusion with the tube is usually
This is performed in a state where the pipes inserted into the joint from both sides are gripped and connected by a pipe gripper called a clamp.

[0003]

When a resin pipe is connected by a socket-type electric fusion joint, it is necessary to align the joint and the pipe so that they are aligned. If the axis of the fitting and the pipe are aligned and not centered, the gap between the pipe and the fitting (clearance) will be uneven before and after in the pipe axis direction, and up, down, left and right of the cross section perpendicular to the pipe axis. And the molten resin tends to flow in the direction of wide clearance at the time of fusion. As a result, adjacent heating wires may come into contact with each other and cause a short circuit.

[0004] The present invention relates to a socket-based electric fusion joint,
An object of the present invention is to provide a tube gripper which is used for gripping a tube at the time of electric fusion with a resin tube and which can center the tube and a joint at the time of fusion.

[0005]

According to the first aspect of the present invention, there is provided a socket-type electrofusion joint having an insertion port, and a resin pipe inserted into the insertion port of the joint. And a positioning means for positioning the joint so that the joint and the resin tube are centered. According to the present invention, the electrofusion is performed in a state where the tube is gripped, the joint is positioned by the positioning means, and the joint and the tube are centered.

The invention according to claim 2 is characterized in that the positioning means of the invention according to claim 1 is a jig for supporting the joint from below. According to the present invention, by positioning the joint on the jig, the joint is positioned, and the axis of the joint coincides with the axis of the resin pipe in the height direction and is centered.

The invention according to claim 3 is characterized in that the positioning means of the invention according to claim 1 is a jig that supports the joint from below and abuts the joint from the side. FIG. 1 shows one embodiment of a jig according to the present invention, and FIG. 2 shows another embodiment of the jig, in which a tube inserted into a joint is gripped by a gripper at the time of electrofusion. At the same time, in the jig 1 shown in FIG. 1, the joint 2 is applied to the rising portion 1a and placed on the jig. In the jig 3 shown in FIG. 2, the outside of the corner of the joint 2 is applied to the curved portion 3a, and the jig 3 is placed on the jig. In any case, by mounting the joint 2 on the jig 1 or 3, the joint 2 can be positioned from the height direction and the lateral direction.

The invention according to claim 4 is characterized in that the positioning means of the invention according to claim 1 is a jig provided with a concave groove into which a joint is fitted. According to the present invention, by positioning the joint in the groove of the jig, the positioning in the height direction and the positioning in the lateral direction are performed from both left and right sides.

According to a fifth aspect of the present invention, the positioning means according to any one of the first to fourth aspects is switchable between a use position and a non-use position retracted from the use position. Features. According to the present invention, when the positioning means is in the way of performing other operations, it is retracted to the non-use position.

According to a sixth aspect of the present invention, the positioning means according to any one of the first to fifth aspects comprises a plurality of positioning means capable of respectively positioning joints having different sizes. Can be switched between a position for positioning the joint and a position retracted from the position. According to the present invention, when positioning a joint having a different size, the positioning means corresponding to the joint of the size is switched from the retracted position to the positioning position.

According to a seventh aspect of the present invention, the positioning means according to any one of the first to fifth aspects comprises a plurality of positioning means capable of positioning joints having different sizes. It is characterized by being detachable from the tube gripper. According to the present invention, when positioning joints of different sizes, a positioning means corresponding to the joint of the size is selected and attached to the positioning position of the tube gripper.

The invention according to claim 8 is characterized in that the positioning means of the invention according to any one of claims 1 to 7 is adjustable in height. According to the positioning means of the present invention, the height can be changed according to the size of the joint. In order to allow the positioning means to adjust the height, for example, a jig supporting the joint is constituted by an outer cylinder and an inner cylinder slidably mounted on the outer cylinder, and the inner cylinder is adjusted to an arbitrary height. After that, it is possible to adopt a method of fastening the inner cylinder with screws screwed through the outer cylinder, a method of screwing the inner cylinder into the outer cylinder, and rotating the inner cylinder or the outer cylinder to raise and lower the inner cylinder. it can.

The invention according to claim 8 is characterized in that the positioning means according to any one of claims 1 to 5 has a plurality of support portions for positioning and supporting joints having different sizes. And In the present invention, one positioning means is provided with a plurality of positioning support portions, and when positioning joints having different sizes, the joints are supported by the support portions corresponding to the joints of the sizes.

A tenth aspect of the present invention is characterized in that the positioning means of the invention according to any one of the first to ninth aspects can adjust the position along a line bisecting the joint. According to the present invention, the position of the positioning means is adjusted according to the size of the joint. According to an eleventh aspect of the present invention, in the invention according to any one of the first to tenth aspects, the joint is an elbow joint.

[0015] In the case of a socket joint or a cheese joint, it is checked whether or not the axis of the joint coincides with the center of the pipe by centering the joint by checking whether or not the joint can be rotated with the resin pipe inserted into both sides. This check can be performed even when the tubes on both sides are gripped by the tube gripper,
In the case of an elbow joint, it cannot be rotated, it is necessary to rely on the worker's feeling whether or not centering is performed, and fusion work may be performed while centering is poor. According to the invention, reliable centering is possible even in the case of an elbow joint.

According to a twelfth aspect of the present invention, in the tube gripper of the eleventh aspect, at least one of the plurality of tube grippers can be turned so as to grip an elbow joint forming an arbitrary angle. It is characterized by being able to do. According to the present invention, 90 °, 45 °, 2 °
An elbow joint of 2.5 ° or any other angle can be gripped.

According to a thirteenth aspect, in the invention according to any one of the first to twelfth aspects, the positioning means supports the joint central portion. According to the present invention, the joint can be supported horizontally without tilting.

[0018]

FIG. 3 shows a tube gripper for an elbow joint. An arm 6 is rotatably supported at an angle on a corner portion of a base 5 at a corner portion. The base 5 passes through an arc groove 7 formed in the arm 6.
The arm 6 can be fixed at an arbitrary angle by screwing the nut 9 into the end of the screw 8 that projects further. At one end of the base 5 and at the end of the arm 6, a tube gripper 12 for detachably gripping the tube 11 is attached.

The tube gripper 12 has a known structure.
Although a detailed description is omitted, it can be opened and closed in the form of a clasp, so that the tube 11 can be gripped when closed and fixed. The other end of the base 5 has an elbow joint 1
Jig 14 as positioning means for positioning the height 3
Is installed. The jig 14 has a rectangular cross section as shown in FIG. 4, and supports the joint 13 from below.

When the resin pipe 11 is connected by the elbow joint 13, the arm 6 is adjusted to the angle formed by the elbow joint 13, and then the resin pipe 11 is inserted into both sides of the elbow joint 13 by a predetermined amount. As shown in FIG.
Is held on the jig 14 with the tube grippers 12 on the resin tubes 11 on both sides of the joint. In this state, the joint 13 is positioned in the height direction by the jig 14 and is centered. Thereafter, a connector of an electric fusion device (not shown) is inserted into the terminal 13a of the elbow joint 13, and electric fusion is performed by supplying a current.

In the tube gripper shown in FIG. 5, a jig 16 as a positioning means is configured similarly to the jig 3 shown in FIG. As shown in FIG. 6, the jig 16 has a screw 18 protruding through a long groove 17 formed on one side of the base 5.
Elbow joint 1 on which a 6 is mounted on a jig along a long groove 17
3 can be moved in the vertical direction of FIG. 5, and can be fixed at an arbitrary position by tightening a nut 19 screwed into a screw end protruding from the long groove 17. ing. By loosening the nut 19 and removing it from the end of the bolt, the jig 16 can be removed and stored or replaced.

When positioning the elbow joint 13, the jig 16 is adjusted in the direction shown by the arrow in FIG. 6, and the curved portion 16a is brought into contact with the corner of the joint 13 from outside. As a result, the elbow joint 13 is positioned from the height and the side, and the axis is aligned with the axis of the resin pipe 11 so as to be centered.

When the jig 16 is in the way, or when the size of the elbow joint 13 cannot be accommodated, the nut 19
Removed and removed. The jig 16 includes a plurality of jigs that can position the joint 13 at a required height according to the size of the elbow joint 13. When centering the joint 13, a jig corresponding to the size of the joint 13 is used. The tool 16 is selected and adjusted and attached to the base 5.

The jig 20 shown in FIG. 7 has two supporting portions formed so as to be able to cope with two types of joints having different sizes, and has a radius of curvature and a different height. The curved portions 20a and 20b are formed in a stepped shape corresponding to the size of the elbow joint. For a joint having a small diameter, as shown by a two-dot chain line in the figure, the upper curved portion 20a is provided at the corner of the joint. For a joint having a large diameter, a lower curved portion 20b is applied to a corner of the joint as shown by a dashed line in the figure. In the tube gripper shown in FIG. 8, two types of jigs 21 and 22 having different positioning heights are movably mounted on a base 24 along a long groove 23 formed in the left-right direction of FIG.

In this embodiment, the jig 21 or 22 corresponding to the size of the joint 13 is switched to the positioning position at the center of the long groove, and the other unused jigs 22 or 21 are retracted to the retracted positions of the left and right long groove ends. Is done. Both jigs 21 and 22
When using both jigs 21 and 22
Are retracted to the retracted positions at both left and right ends of the long groove.

In the tube gripper shown in FIG. 9, a jig 26 as positioning means is attached to a base 27 by an outer cylinder 26a.
And a joint support base 26c provided at the upper end thereof, slidably fitted into the outer cylinder 26a, and set with the set screw 28.
The inner cylinder 26b is fixed to the inner cylinder 26b.

In the present embodiment, the jig 26 can be adjusted to an arbitrary height by loosening the set screw 28 and moving the inner cylinder 26b up and down. It can be stored inside the cylinder.

In the embodiment shown in FIG. 10, the outer cylinder 31a
An L-shaped hook groove 32 is inserted into the outer cylinder 31a of the jig 31 as a positioning means which is slidably fitted into the outer cylinder 31a and has a support base 31c for supporting the joint.
Is formed, and the pin 33 projecting from the inner cylinder 31b is
2 is fitted.

In the present embodiment, when the pin 33 is pulled up along with the inner cylinder 31b until the pin 33 hits the upper end of the hook groove and then turned, the pin 33 is positioned at the horizontal portion 32a of the hook groove 32 and the support table 31c at the solid line position is turned. When the pin 31c is positioned at the vertical position 32b of the hook groove 32 by holding the support 31c in the opposite direction to that described above,
The support 31c is lowered to the lower position indicated by the solid line, whereby the support 31c is switched between the upper position and the lower position.

[0030]

According to the pipe gripper of the invention according to the first aspect, the joint and the pipe can be centered, and it is necessary to confirm whether the joint and the pipe are centered at the time of electrofusion. In addition, electric fusion can be performed in a state where the joint and the pipe are centered, and fusion can be normally and reliably performed.

According to the pipe gripper of the second aspect of the invention, the centering of the joint and the pipe can be performed only by providing the jig for supporting the joint. According to the positioning means of the invention according to the third aspect, by positioning the joint from up and down and from the lateral direction, it is possible to perform centering in which the axes of the joint and the pipe coincide.

According to the positioning means of the invention according to the fourth aspect, by positioning the joint from both the upper and lower directions and the left and right directions, the centering in which the axes of the joint and the pipe coincide with each other can be reliably performed. According to the tube gripper of the invention according to claim 5, by retracting the positioning means, it is possible not to hinder other operations.

According to the tube gripper of the invention according to the sixth aspect, even joints having different sizes can be positioned at respective appropriate positions and centered by switching the positioning means. According to the pipe gripper of the invention according to claim 7, even if joints having different sizes are replaced, the joints having different sizes can be positioned at appropriate positions and centered.

According to the pipe gripper of the invention according to claim 8, by adjusting the height of the positioning means, the joint can be positioned and centered at an appropriate position according to the size. According to the pipe gripper of the ninth aspect of the present invention, by supporting the joint on the support portion corresponding to the size, a plurality of joints having different sizes can be positioned by one pipe gripper.

According to the tenth aspect, by adjusting the position of the positioning means, the joint can be supported and centered at a required position. According to the tube gripper of the present invention, it is possible to prevent the centering failure from being performed even in the elbow joint where it is difficult to confirm whether the centering is performed.

According to the pipe gripper of the twelfth aspect, the present invention can be applied to various elbow joints having different angles. According to the tube gripper of the invention according to claim 13, the joint can be supported horizontally, and the electric fusion can be performed more reliably.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating one embodiment of a jig.

FIG. 2 is a sectional view showing another embodiment of the jig.

FIG. 3 is a plan view of the tube gripper according to the present invention.

FIG. 4 is a sectional view of a main part of the tube gripper shown in FIG. 3;

FIG. 5 is a plan view of another embodiment of the tube gripper according to the present invention.

FIG. 6 is a sectional view of the main part.

FIG. 7 is a sectional view showing another embodiment of the jig.

FIG. 8 is a plan view showing still another embodiment of the pipe end device according to the present invention.

FIG. 9 is a sectional view showing another embodiment of the jig.

FIG. 10 is a front view showing still another embodiment of the jig.

[Explanation of symbols]

 1, 3, 14, 16, 20, 21, 22, 22, jig 2, 13, joint 3a, 16a, curved portion 5, 24, 27, base 6, arm 7, arc groove 8 Screws 9, 19 Nuts 11 Resin pipes 12 Pipe grippers 17, 23 Long grooves 26a, 31a Outer cylinder 26b, 31b Inner cylinder 26c Support base 28 Set screw 32 ・ ・ Hook groove 33 ・ ・ Pin

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H019 EA11 EA14 GA02 4F211 AD05 AD12 AD13 AG08 AH11 AH43 TA01 TC07 TC11 TD11 TH02 TH06 TJ14 TJ22 TJ30 TN31

Claims (13)

[Claims] 1. A tube gripper used for gripping a socket-type electro-fusion joint having an insertion port and a resin pipe inserted into the insertion port of the joint when the tube is electro-fused. A tube gripper, further comprising positioning means for positioning the joint so that the joint and the resin tube are centered. 2. The tube gripper according to claim 1, wherein said positioning means is a jig for supporting the joint from below. 3. The tube gripper according to claim 1, wherein said positioning means is a jig that supports the joint from below and strikes the joint from the side. 4. The tube gripper according to claim 1, wherein said positioning means is a jig provided with a concave groove into which a joint is fitted. 5. A tube gripper according to claim 1, wherein said positioning means is switchable between a use position and a non-use position retracted from said use position. . 6. The positioning means comprises a plurality of positioning means capable of respectively positioning joints having different sizes, each of which is switchable between a position for positioning the joint and a position retracted from the position. The tube gripper according to any one of claims 1 to 5, wherein the tube gripper is provided. 7. The apparatus according to claim 1, wherein said positioning means comprises a plurality of positioning means capable of positioning joints having different sizes, and each positioning means is detachable from the tube gripper. A tube gripper according to any one of the preceding claims. 8. The tube gripper according to claim 1, wherein said positioning means has a plurality of support portions for positioning and supporting joints having different sizes. 9. A tube gripper according to claim 1, wherein said positioning means is adjustable in height. 10. The tube gripper according to claim 1, wherein the positioning means is adjustable in position along a line bisecting the joint. 11. The tube gripper according to claim 1, wherein the joint is an elbow joint. 12. The pipe gripper according to claim 1, wherein at least one of said plurality of pipe grippers is pivotable to grip an elbow joint at an arbitrary angle. 12. The tube gripper according to 11. 13. The tube gripper according to claim 1, wherein the positioning means supports a central portion of the joint.