JP2014196820A - Clamp for pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp for a pipe joint capable of easily and accurately inserting pipes into the pipe joint in connection work of the pipes, and capable of being used as a clamp.SOLUTION: A clamp 1 for a pipe joint fixed to ends of a pair of pipes 2A and 2B connected by a pipe joint 3 includes a fixed side clamp 10 externally fitted to an outer periphery of an end of one first pipe 2A so as to detachably fasten thereof, a movable side clamp 20 externally fitted to an outer periphery of an end of the other second pipe 2B so as to detachably fasten thereof, a plurality of guide shafts 30 extended along a pipe axis direction X of the first pipe 2A and the second pipe 2B so that a fixed end 30a is fixed to the first pipe 2A and a free end 30b is slidably journaled to the second pipe 2B, and a sliding means 40 for moving the movable side clamp 20 in a direction close to or separated from the fixed side clamp 10 along the guide shaft 30.

Description

  The present invention relates to a pipe joint clamp fixed to each end of a pair of pipes connected by a pipe joint.

  As a method for connecting pipes by this type of heat fusion, for example, the pipes are connected by heating and fusing them by passing a current through a heating wire pre-embedded in a polyethylene tubular joint member. . By the way, in the joint formation by the fusion joint, it is necessary to insert the end portions of the pipes to the predetermined positions at both ends of the pipe joint. However, this operation is performed manually by an operator. Therefore, when the diameter of the pipe is large, a large insertion force is required when inserting the pipe, and this insertion work requires skill. Therefore, generally, as shown in FIG. 5, clamps 6A and 6B are fixed to the outer circumferences of the ends of both pipes 2A and 2B, and the clamps 6A and 6B are connected by a plurality of chain blocks 7. And the insertion force at the time of inserting piping into the pipe joint 3 is obtained by operating by pulling equally.

  Further, Patent Document 1 discloses a fixed-side clamp portion that holds both pipes in a state in which one end side and the other end side of a pipe joint are externally fitted to joint ends of two pipes to be joined. And a movable side clamp part, a frame for connecting the movable side clamp parts is provided, and the frame is composed of a first frame for attaching the fixed side clamp part and a second frame for attaching the movable side clamp part. A telescopic mechanism for expanding and contracting the frame by relatively moving the first and second frames, and a fixing mechanism for fixing the frame expanded and contracted to a predetermined length by the expansion and contraction mechanism at the predetermined length. Thus, a method for obtaining the insertion force is disclosed.

Japanese Utility Model Publication No. 6-69559

However, in the case of a large-diameter pipe joint, it is difficult to accurately insert the pipes parallel to the axial direction only by a method using a chain block or a method using an expansion / contraction mechanism such as Patent Document 1. There was a problem.
In addition, in order to cope with the difficulty of insertion as described above, the insertion work is also performed after applying lubrication to the pipe to make it slippery, but in the case of a polyethylene pipe (PE pipe) Since it becomes a hindrance to joining and the use of a lubricant is not possible, there is room for improvement in that respect.

  The present invention has been made in view of the above-described problems, and it is possible to easily and accurately insert a pipe into a pipe joint when connecting pipes, and to use the pipe joint as it is as it is. An object is to provide a clamp for the use.

  In order to achieve the above object, the clamp for pipe joint according to the present invention is a clamp for pipe joint fixed to each end of a pair of pipes connected by the pipe joint, and is an end of one first pipe. A fixed-side clamp that is externally fitted to the outer periphery of the part, and is detachably clamped; a movable-side clamp that is externally fitted to the outer circumference of the other second pipe and is detachably clamped; and the first pipe and the second pipe A plurality of guide shafts extending along the tube axis direction, having one end fixed to the first pipe and the other end slidably supported by the second pipe, along the guide shaft And a sliding means for moving the movable side clamp in a direction approaching and separating from the fixed side clamp.

According to the clamp for a pipe joint according to the present invention, when the pipes are connected to each other by the pipe joint, the pipe joint is first fixed to the end portion of the first pipe, and then the pipe joint is fixed. A fixed side clamp is clamped on the outer periphery of the end of the second pipe, and a movable side clamp is clamped on the outer periphery of the end of the second pipe. Next, the end of the second pipe can be inserted into the pipe joint by moving the movable side clamp along the guide shaft by the sliding means in the direction approaching the fixed side clamp.
In this case, since the plurality of guide shafts are slidably supported with respect to the movable side clamps, the movable side clamps are close to each other while maintaining the state parallel to the fixed side clamps along the plurality of guide shafts. Can be made. Therefore, the second pipe sandwiched by the movable side clamp can be accurately moved in the pipe axis direction, and can be inserted coaxially without being displaced with respect to the pipe joint. it can.

  Moreover, the clamp for pipe joints of this invention can be used as a clamp which supports 2nd piping as it is at the time of heat sealing | fusion operation, even after inserting 2nd piping into a pipe joint.

  Furthermore, the clamp for pipe joints can change the distance between the fixed side clamp and the movable side clamp, that is, the clamp width dimension, by adjusting the length of the guide shaft, and also according to the shape of the pipe joint. Thus, the clamping position of the clamp with respect to the pipe can be freely changed.

  In the clamp for pipe joint according to the present invention, at least one of the plurality of guide shafts forms a drive shaft that is moved by the sliding means, and the other guide shaft follows the drive shaft in synchronization. It may be a driven shaft.

  In this case, at least one of the guide shafts can be a drive shaft such as a rack or a feed screw, and the guide shaft itself can be configured as a part of the drive means. There is an advantage that it is not necessary to separately provide sliding means for moving in the direction, and the structure becomes simple.

  Moreover, in the clamp for pipe joints according to the present invention, it is preferable that the guide shaft is supported via a low friction member with respect to the second pipe.

  In the present invention, since the frictional resistance during sliding of the movable side clamp with respect to the plurality of guide shafts is reduced, the accuracy of parallelism when moving along the guide shaft of the movable side clamp can be increased, and the tube can be more easily processed. Insertion work for the joint can be performed.

  Moreover, in the clamp for pipe joints according to the present invention, it is preferable that three or more guide shafts are provided at equal intervals along the circumferential direction of the pipe.

  Thereby, the attitude | position of the movable side clamp which slides along a guide shaft is stabilized, and insertion accuracy can be improved.

  According to the clamp for a pipe joint of the present invention, it is possible to easily and accurately insert the pipe into the pipe joint at the time of connecting the pipes, and there is an effect that the pipe can be used as it is.

It is a side view which shows the structure of the clamp for pipe joints by embodiment of this invention, Comprising: It is a figure which shows the state before inserting 2nd piping in a pipe joint. It is the sectional view on the AA line shown in FIG. It is a figure which shows the structure of a sliding means. It is a side view showing the state where the 2nd piping was inserted in the pipe joint. It is a side view for demonstrating the connection method of the conventional piping.

  Hereinafter, clamps for pipe joints according to embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a clamp 1 for a pipe joint according to this embodiment includes a pair of pipes 2 (by heat-sealing a pipe joint 3 of a cylindrical polyethylene electrofusion socket joint (hereinafter referred to as an EF joint). 2A, 2B) is a jig for butt-joining each other, and is used by being fixed to the first pipe 2A and the second pipe 2B on both sides of the pipe joint 3. That is, one end part 2a of the first pipe 2A and the other end part 2b of the second pipe 2B are externally fitted to the one end part 3a side and the other end part 3b side of the pipe joint 3, respectively. Both pipes 2A and 2B are clamped by the joint clamp 1, and one pipe (here, the second pipe 2B) and the pipe joint 3 are fused.

  The clamp for pipe joint 1 is detachably attached to the fixed side clamp 10 that is detachably fitted to the first pipe 2A that is one fixed side and the second pipe 2B that is the other sliding side. The movable clamp 20 that is clamped by fitting, and extends along the tube axis direction X of the first pipe 2A and the second pipe 2B, one end is fixed to the first pipe 2A and the other end is the second pipe. A plurality of (four here) guide shafts 30 that are slidably supported by 2B, and a slide that moves the movable side clamp 20 along the guide shaft 30 in a direction approaching and separating from the fixed side clamp 10 Means 40.

  Here, FIG. 2 shows the movable side clamp 20, but the configuration is the same as that of the fixed side clamp 10 except for a bearing portion to be described later. To do. In FIG. 2, reference numerals in parentheses indicate members and parts related to the fixed-side clamp 10.

  The fixed-side clamp 10 has a pair of half-ring-shaped sandwiching rings 11A and 11B that sandwich the first pipe 2A, and the pair of sandwiching rings 11A and 11B face each other so as to form a ring shape. It can be combined. The sandwiching rings 11A and 11B are formed in a shape in which both end portions 11a and 11b protrude outward in the ring radial direction. The one end portions 11 a and 11 a of the sandwiching rings 11 A and 11 B are connected to each other by the hinge portion 12, and the other end portions 11 b and 11 b are connected to each other by the locking metal fitting 13.

  The locking metal fitting 13 includes a rotating piece 13A whose one end is rotatably supported by the other end portion 11b of the other second holding ring 11B, and a threaded portion screwed into the other end of the rotating piece 13A from the outside. 13B. The rotating piece 13A is formed in a frame shape, and the other end portion 11b of one first holding ring 11A can be fitted into the frame in a state where the holding rings 11A and 11B are combined in a ring shape. . Further, by tightening the screw portion 13B in a state where the other end portion 11b of the first sandwiching ring 11A is fitted in the rotating piece 13A, the other end portion of the first sandwiching ring 11A at the tip of the screw portion 13B. 11b is fastened and fixed. The fixed side clamp 10 can be removed from the first pipe 2A by loosening the screw part 13B and removing the rotating piece 13A from the other end part 11b of the first holding ring 11A.

  Further, the fixed side clamp 10 is provided with a shaft attaching portion 14 for fixing one end portion (fixed end 30a) of the guide shaft 30 with a certain interval along the circumferential direction on the outer peripheral surface.

  As shown in FIG. 2, the movable-side clamp 20 has a pair of half-ring-shaped sandwiching rings 21A and 21B that sandwich the second pipe 2B, as with the fixed-side clamp 10, The sandwiching rings 21A and 21B can be combined so as to face each other so as to form a ring shape. Since the shape of the sandwiching rings 21A and 21B, the hinge part 22, and the structure of the locking fitting 23 (the rotating piece 23A and the screw part 23B) are the same as those of the fixed-side clamp 10, detailed description thereof is omitted here. To do.

  Further, the movable clamp 20 is provided with a bearing 24 (low friction member) that pivotally supports the other end portion (free end 30b) of the guide shaft 30 at a certain interval along the circumferential direction on the outer peripheral surface. ing. The bearing 24 is a member that supports the guide shaft 30 with a small frictional resistance. A bearing 30 is used for the rod 30B described later, and a pinion 41 is used for the rack 30A. .

  The four guide shafts 30 extend in parallel along the tube axis direction X on the outside in the radial direction of the pipes 2 </ b> A, 2 </ b> B and the pipe joint 3. One of the four guide shafts 30 is a rack 30A that forms a drive shaft that is moved by the sliding means 40, and the other three guide shafts 30 are rod-shaped rods 30B that follow in synchronization with the rack 30A. (Driven shaft). As described above, in the guide shaft 30 (30A, 30B), the fixed end 30a on the fixed side clamp 10 side is fixed to the shaft mounting portion 14, and the free end 30b on the movable side clamp 20 side is supported by the bearing 24. ing.

As shown in FIGS. 1 and 3, the rack 30 </ b> A is provided with a tooth surface facing radially outward and meshes with a pinion 41 incorporated in the bearing 24.
In this embodiment, the sliding means 40 includes the rack 30A and the pinion 41 described above. The pinion 41 is rotatably provided within the bearing 24 of the movable side clamp 20. Further, the pinion 41 is locked to the teeth 41a to allow rotation in one direction (forward rotation in the direction of arrow E in FIG. 3) and restrict reverse rotation (rotation in the direction of arrow F in FIG. 3). A rotation restricting piece 42 is provided. The rotation restricting piece 42 is configured to be able to selectively take a locking position P1 that meshes with the teeth 41a of the pinion 41 and a retracted position P2 that is disengaged outside the teeth 41a. That is, the rotation restricting piece 42 is positioned at the locking position P1 when the movable clamp 20 is brought close to the fixed clamp 10 or when the movable clamp 20 is stopped, and the movable clamp 20 is fixed to the fixed clamp 10. When the pinion 41 is moved away from the pinion 41, the pinion 41 can be rotated in the reverse direction by being positioned at the retracted position P2.

The pipe joint clamp 1 described above has the following effects.
That is, as shown in FIG. 1, in the pipe joint clamp 1 of the present embodiment, when the first pipe 2 </ b> A and the second pipe 2 </ b> B are connected to each other by the pipe joint 3, first, one end of one first pipe 2 </ b> A. The pipe joint 3 is fixed to the portion 2a, and then the fixed side clamp 10 is sandwiched around the outer periphery of the end of the first pipe 2A to which the pipe joint 3 is fixed, and the movable side clamp 20 is attached to the outer periphery of the end of the second pipe 2B. To pinch.

  Next, by moving the movable clamp 20 along the guide shaft 30 in the direction X1 close to the fixed clamp 10 by the sliding means 40, as shown in FIG. 4, the other end of the second pipe 2B. 2 b can be inserted into one end 3 b of the pipe joint 3. Specifically, as shown in FIG. 3, when the pinion 41 of the sliding means 40 is operated and rotated forward (rotation in the E direction), the pinion 41 is rotated and fixed along the rack 30 </ b> A as shown in FIG. 4. The second pipe 2 </ b> B can be inserted into the pipe joint 3 by moving in the direction X <b> 1 close to the side clamp 10.

  In this case, since the plurality of guide shafts 30 are slidably supported with respect to the movable side clamp 20 via the bearings 24, the movable side clamp 20 is fixed along the plurality of guide shafts 30. 10 can be brought close to each other while maintaining a parallel state. Therefore, the second pipe 2B sandwiched by the movable side clamp 20 can be accurately moved in the tube axis direction X, and can be inserted coaxially without being displaced with respect to the pipe joint 3. Can be inserted.

  Moreover, the clamp 1 for pipe joints of this Embodiment can be used as a clamp which supports the 2nd piping 2B as it is at the time of heat sealing | fusion operation, even after inserting the 2nd piping 2B in the pipe joint 3. FIG.

  Furthermore, in the present embodiment, the distance between the fixed side clamp 10 and the movable side clamp 20, that is, the clamp width dimension can be changed by adjusting the length of the guide shaft 30, and the pipe joint 3. The clamping positions of the clamps 10 and 20 with respect to the pipes 2A and 2B can be freely changed according to the shape of the above.

  Further, one of the guide shafts 30 is a drive shaft for the rack 30A, and the guide shaft 30 itself can be configured as a part of the sliding means 40. There is an advantage that it is not necessary to separately provide the sliding means 40 for moving to a simple structure.

  In the present embodiment, since the guide shaft 30 is supported via the bearing 24 made of a low friction member, the frictional resistance when the movable clamp 20 slides with respect to the plurality of guide shafts 30 is reduced. And the precision of the parallelism at the time of the movement along the guide shaft 30 of the movable side clamp 20 can be improved, and the insertion operation with respect to the pipe joint 3 can be performed more easily.

  Further, since the four guide shafts 30 are provided at equal intervals along the circumferential direction of the pipes 2A and 2B, the posture of the movable side clamp 20 that slides along the guide shaft 30 is stable and inserted. Accuracy can be improved.

  As described above, in the clamp for pipe joint according to the present embodiment, the second pipe 2B can be easily and accurately inserted into the pipe joint 3 when the pipes 2A and 2B are connected to each other, and is used as it is as a clamp. The effect which becomes possible is produced.

  As mentioned above, although embodiment of the clamp for pipe joints by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.

  For example, in the above-described embodiment, the rack 30A and the pinion 41 are employed as the sliding means for the movable side clamp. However, the present invention is not limited to this, and a feed screw, a lever block (registered trademark), a chain block is used. A hydraulic cylinder or the like can be used as the sliding means.

  In the present embodiment, the bearing 24 is used as the low friction member of the shaft support portion between the movable side clamp 20 and the guide shaft. However, the bearing 24 is not limited thereto. For example, it is good also as a low friction member which processed the synthetic resin which superposed | polymerized polytetrafluoroethylene in the axial support part of the guide shaft of the movable side clamp 20. FIG.

  Further, the number of guide shafts 30, the position in the circumferential direction, the number of divisions of the clamping rings 10 and 20, the connection structure, and the like can be set as appropriate. There may be a plurality of guide shafts 30, and in particular, if there are three or more guide shafts 30 provided at equal intervals along the circumferential direction, the movable side clamp 20 that slides along the guide shaft 30 is the same as in the above embodiment. The posture is stable and the insertion accuracy can be improved.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Clamp for pipe joints 2A 1st piping 2B 2nd piping 3 Pipe joint 10 Fixed side clamp 11A, 11B Clamping ring 14 Shaft mounting part 20 Movable side clamp 21A, 21B Clamping ring 24 Bearing (low friction member)
30 Guide shaft 30A Rack 30B Rod 40 Sliding means 40
41 Pinion X Tube axis direction

Claims (4)

A clamp for a pipe joint fixed to each end of a pair of pipes connected by a pipe joint,
A fixed-side clamp that is externally fitted to the outer periphery of one end of the first pipe and is detachably held;
A movable-side clamp that is externally fitted to the outer periphery of the other second pipe and is detachably held;
A plurality of guides extending along the pipe axis direction of the first pipe and the second pipe, one end of which is fixed to the first pipe and the other end is slidably supported by the second pipe. The axis,
Sliding means for moving the movable side clamp along the guide shaft in a direction approaching and separating from the fixed side clamp;
A clamp for pipe joints characterized by comprising: At least one of the plurality of guide shafts constitutes a drive shaft that is moved by the sliding means,
The clamp for a pipe joint according to claim 1, wherein the other guide shaft is a driven shaft that follows the drive shaft in synchronization.   The pipe joint clamp according to claim 1 or 2, wherein the guide shaft is supported by the second pipe via a low friction member.   The pipe joint clamp according to any one of claims 1 to 3, wherein three or more guide shafts are provided at equal intervals along a circumferential direction of the pipe.

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