JP2017214959A - Clamp device for pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp device for pipe joint in which components do not wear and slackness does not occur in a clamp, and which does not require replacement of components.SOLUTION: A clamp device includes: a body for surrounding one part of the periphery of a pipe; a locking part provided at one end part of the body and for locking one end of a flange of a pipe joint; and an arm pivotally attached to the other end part of the body by a pivot shaft. The arm includes: an eccentric shaft fixed to a rotary shaft provided at the arm; a roller rotating around the eccentric shaft; and a pressing plate provided so as to move in parallel along the pivot shaft and slide with the arm. By rotating the rotary shaft, the roller presses the other end of the flange of the pipe joint via the pressing plate, and the pipe joint can be held tightly in the pipe placed in the body.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a pipe joint clamping device. In particular, when a resin saddle joint is fused to a resin pipe in order to branch the resin pipe by an electrofusion method (electric fusion, electrofusion, EF) or the like, the saddle joint is fixed to the resin pipe with a predetermined tightening force. It is related with the clamp device pressed and held by. Such a joint is called an EF joint. The EF joint to which the present invention is applied is not limited to a saddle joint, and can be widely applied to joints called service chi (service cheese), bypass saddle, repair saddle, and the like. The present invention is not particularly limited to polyethylene (PE) resin pipes and resin joints, and can be widely applied to clamps of pipes and pipe joints such as other resin pipes and metal pipes. .

  As shown in FIG. 1, when connecting a branch resin pipe (not shown) to the resin pipe 33, a bowl-shaped resin joint generally called a saddle joint 31 is used. The saddle joint 31 includes a semicircular tubular flange portion 31a in which a heating wire is incorporated, a fixing flange 31d provided on both sides, a branch insertion port or receiving port 31b, and a socket terminal 31c into which an energization cable is inserted. Is provided.

  First, the saddle joint 31 is fixed to the outer periphery of one resin pipe 33, and the other resin pipe is connected to the saddle joint 31. A saddle joint called an EF joint is made of an outer layer and a stiffener, and is completely integrated with an inner layer of polyethylene incorporating a heating wire. In this case, since the joining of the pipe and the saddle joint is made of resin, melt-compression is performed by an electrofusion method.

  When joining a saddle joint for connecting a branch pipe by this electrofusion method to a resin pipe, the saddle joint 31 in which a heating wire is embedded is pressed against the resin pipe 33 by pressing means in advance, and the saddle is in that state. By energizing the heating wire of the joint 31 via the socket terminal 31c, the joint surface with the resin tube 33 is melted and fused to the resin tube 33 of the mating partner. Thereafter, a hole is formed in the resin pipe 3 through a drilling tool from the branch insertion port or the receiving port 31b of the saddle joint 31 to complete the branch path.

  In order to fuse the pipe joint 31 to the resin pipe 33 by such an electrofusion method, means for pressing and holding the pipe joint against the resin pipe is necessary, and various holding devices have been devised.

  As a method for holding and holding the resin pipe and the saddle joint, a method using a screw as shown in FIG. 11 of the prior art is known. This is a method in which the resin pipe 33 and the flange 31d of the saddle joint 31 in FIG. 1 are fastened to the main body 1 with screws 51 by the press plate 13 of the arm 3 pivotally attached to the main body 1 (the pivot shaft 25). . The flange 31d of the saddle joint 31 in FIG. 1 is locked to the locking portion 12, and the other flange 31d is held down by the presser plate 13 and tightened with a screw 51 to hold the resin pipe and the saddle joint.

  The problem of the screw type in FIG. 11 is that when the clamp holding plate 13 and the main body 1 are fastened with a screw, the saddle joint 31 and the like may be deformed by turning the screw too much. Further, when the press plate 13 of the saddle joint 31 is pressed by the press plate 13, the force is repelled, and the arm 3 and the press plate 13 are moved outward. Therefore, in the saddle joint 31, there is a problem that the presser plate 13 is displaced from the position where the presser plate 13 presses the saddle joint 31 and the holding is insufficient. The arm 3 is also deformed to the outside during repeated use of the clamp, causing trouble in use.

  A cam-type clamp is also disclosed in Patent Document 1 and the like. In order to show the operation principle of such a cam type clamp in an easy-to-understand manner, an example of the conventional cam type clamp shown in FIG. 12 will be described. This prior art also holds the saddle joint by an eccentric cam 9 '. The main body 1, the locking portion 12, and the arm 3 are the same as the basic structure of FIG. 11, and the arm 3 is provided with a rotating shaft 7, and an eccentric cam 9 ′ rotating around the rotating shaft 7 is rotated by a lever 23. Let The rotation of the lever 23 causes the eccentric cam 9 'to hold the resin pipe and the saddle joint by pressing the pressing plate 13 down along the guide rod 5 against the spring 5a as shown in FIG. However, the following problems also occur in the cam type.

  Due to the shape of the eccentric cam, friction generated between the eccentric cam 9 ′ and the presser plate 13 during rotation causes the eccentric cam 9 ′ and the presser plate 13 to rub against each other and wear parts. For this reason, the eccentric cam 9 'and the presser plate 13 are coated in order to reduce friction, but the pressing force may be large, the eccentric cam 9' and the presser plate 13 are rubbed against each other, and the parts are worn away. 23 moves heavier. In addition, when wear of parts occurs, the clamping device also loosens, and a problem arises in the clamping performance itself.

JP 2000-097386 A

  In view of the above problems, the present invention provides a clamp device for a pipe joint that requires less parts replacement because the parts do not wear and the clamp does not loosen.

  In order to solve the above problem, the invention of claim 1 is a clamping device for clamping a pipe joint (31) for branching a pipe (33) to the pipe (33), the pipe (33). ) Surrounding a part of the periphery of the main body (1), a locking part (12) provided at one end of the main body and locking one end of the flange (31d) of the pipe joint (31), 1), the arm (3) pivotally attached to the other end portion of the pivot shaft (25), wherein the arm (3) is a rotary shaft provided on the arm (3). 7) The eccentric shaft (11) fixed to the eccentric shaft (11), the roller (9) rotating around the eccentric shaft (11), and the pivot shaft (25) can be translated to slide on the arm (3). A presser plate (13) provided on the rotating shaft (7), The recording roller (9) pressed the other end (31d) of the flange of the pipe joint (31) via the presser plate (13), and the pipe joint (31) was placed in the main body. It is a clamping device that can be held in close contact with the tube (33).

  Thereby, friction does not occur between the roller and the presser plate, and the parts do not wear. Since the parts do not wear, there is little need for coating. Furthermore, the clamp does not loosen, and there is no need to replace parts due to the loosening.

  In addition, the code | symbol attached | subjected above is an example which shows a corresponding relationship with the specific embodiment as described in embodiment mentioned later.

It is a perspective view explaining a resin pipe and a resin saddle joint. 1 is a perspective view of a first embodiment of the present invention. It is a top view of a 1st embodiment of the present invention. It is sectional drawing regarding the AA line of FIG. 3 at the time of unclamping of 1st Embodiment of this invention. It is sectional drawing regarding the BB line of FIG. It is sectional drawing regarding the AA line of FIG. 3 at the time of the clamp of 1st Embodiment of this invention. It is a top view of a 2nd embodiment of the present invention. It is sectional drawing at the time of unclamping of 2nd Embodiment of this invention. It is sectional drawing at the time of the unclamp of 3rd Embodiment of this invention. It is a perspective view of 3rd Embodiment of this invention. It is sectional drawing of a screw type prior art. It is a fragmentary sectional view of the eccentric cam type prior art.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. About each embodiment, the same code | symbol is attached | subjected to the part of the same structure, and the description is abbreviate | omitted.

(First embodiment)
FIG. 2 is a perspective view of the first embodiment of the present invention. FIG. 3 is a plan view of the first embodiment of the present invention. 4 is a cross-sectional view taken along line AA of FIG. 3 during unclamping according to the first embodiment of the present invention. FIG. 5 is a cross-sectional view taken along line BB in FIG. 6 is a cross-sectional view taken along line AA of FIG. 3 during clamping according to the first embodiment of the present invention.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a sectional view at the time of clamping according to the first embodiment of the present invention, in which a resin pipe joint 31 described by an imaginary line is held in close contact with a resin pipe 33 placed in the main body 1. Yes.

  In the first embodiment, a saddle joint is described as a pipe joint for the resin pipe 33. However, the present invention is not limited to the saddle joint, and can be widely applied to joints called service chi (service cheese), bypass saddle, repair saddle, and the like. it can. The present invention is not particularly limited to polyethylene (PE) resin pipes and resin joints, and can be widely applied to clamps of pipes and pipe joints such as other resin pipes and metal pipes. . In addition, when clamping a repair saddle, it is contained in 1st Embodiment of this invention as a pipe joint for branching.

  The main body 1 is formed so as to surround a part of the circumference of the resin tube 33 in the circumferential direction when viewed in a plane perpendicular to the axial direction of the resin tube 33. As shown in FIG. 6, the main body 1 is formed with a recess so as to surround the lower half of the resin tube 33. A U-shaped locking portion 12 is fixed to the end of the left main body 1 in FIGS. 4 and 6, and one end of a fixing flange 31d of the pipe joint 31 is locked as shown in FIG. To do. An arm 3 is pivotally attached to the other end of the main body 1 by a pivot shaft 25.

  A rotating shaft 7 is rotatably installed on the arm 3 via an oil-free bush 19. An eccentric shaft 11 passes through the rotating shaft 7, and the eccentric shaft 11 is fixed to the rotating shaft 7 with a bolt 21. The eccentric shaft 11 may be integrally fixed to the rotating shaft 7. A roller 9 is rotatably attached to the eccentric shaft 11 via an oil-free bush 17. The roller 9 presses a presser plate 13 slidably provided on the arm 3. The presser plate 13 slides against the urging force of the spring 5a using the two guide rods 5 provided on the arm 3 as guides.

  As shown in the cross-sectional view of FIG. 4, the upper tip of the arm 3 is bifurcated at two locations 3 a and 3 b in the axial direction of the rotating shaft 7. As seen in FIGS. 2 and 3, the lever 23 provided on the rotating shaft 7 rotates in a predetermined angle range in the gap between the two axial positions 3 a and 3 b. FIG. 3 shows the position of the lever 23 during unclamping shown in FIG. When the lever 23 is rotated and stopped by the stopper 3c shown in the figure, the rotary shaft 7 is rotated about 180 degrees to the position shown in FIG. 6, and the eccentric shaft 11 has passed the bottom dead center very slightly (about 0. 2 to 0.5 mm over). It is important to pass through the bottom dead center. This is because when the saddle joint 31 is held in close contact with the resin pipe 33, there is a considerable reaction force, and the presser plate 13 is pulled back before the bottom dead center.

  The operating range of the lever 23 is regulated by a stopper for stopping at the time of unclamping and a stopper 3c for stopping at the time of clamping, which are installed in the gap between the two portions 3a and 3b of the arm 3. Depending on the amount of eccentricity of the eccentric shaft 11, it is preferable that the operating range is approximately 180 degrees. By rotating the rotary shaft 7, the eccentric shaft 11 rotates downward from above, and the roller 9 presses the other end 31 d of the flange of the pipe joint 31 through the presser plate 13. Since the roller 9 is rotatable about the eccentric shaft 11, the roller 9 does not rub the presser plate 13 even when the rotating shaft 7 rotates and the eccentric shaft 11 rotates about the central axis of the rotating shaft 7.

  As shown in FIGS. 3 and 5, the main body 1 is composed of two semicircular plates. As shown in FIG. 3, one end side of the two main bodies 1 is fixed at an interval by a locking portion 12, and the other end side of the two main bodies 1 is pivoted as shown in FIG. 25 is fixed with bolts at intervals. The arm 3 is pivotally attached to the pivot shaft 25 (see FIG. 6). FIG. 6 is a cross-sectional view showing a state where clamping of the resin pipe 33 and the pipe joint 31 is completed. When the roller 9 presses the other end 31d of the flange of the pipe joint 31 through the presser plate 13, the lower surface end near the pipe joint 31 of the presser plate 13 is the flange 31a of the pipe joint 31 and the other end 31d of the flange. It is comprised so that the boundary part may be pressed. In FIG. 4, when the presser plate 13 is inclined so that the thickness of the presser plate 13 becomes thinner from the lower surface end portion of the presser plate 13 near the pipe joint 31 toward the right hand direction, the pressing force of the presser plate is more concentrated on the boundary portion. be able to.

  The problem that the arm 3 is displaced outward when the clamp presser plate 13 presses the pipe joint 31 is that the resultant force of the clamp presser plate 13 exerts a force on the outside of the pivot shaft of the arm 3 in the main body 1. It is because of. In order to solve this problem, it is preferable that the direction of the resultant force of the pressing force on the lower surface near the pipe joint 31 of the presser plate 13 is located closer to the center side of the resin pipe than the center of the pivot shaft. For this reason, in FIG. 6, the lower surface end portion of the presser plate 13 near the pipe joint 31 is parallel to the vertical center line L1 and inside (L1 side) by δ from the vertical line L2 passing through the center of the pivot shaft. Should be positioned (see line L3). In this case, it is more effective to incline the lower surface of the presser plate 13.

  According to the present embodiment, the work procedure for tightly holding the pipe joint 31 to the resin pipe 33 placed in the main body is as follows. First, the resin tube 31 is placed in the recess of the main body 1. In the state of FIG. 4, the fixing flange 31 d at one end of the pipe joint 31 is locked in the locking portion 12, and the holding plate 13 is moved at the other end while the arm 3 is swung. It is arranged at 31d. Thereafter, when the lever 23 of FIG. 3 is rotated to the upper position in FIG. 3, the rotating shaft 7 rotates 180 degrees as shown in FIG. At this time, since the eccentric shaft 11 reaches the bottom dead center, the roller 9 presses the pressing plate 13 so that the pipe joint 31 is held in close contact with the resin pipe 33. Thereafter, the output terminal of the power supply is inserted into the socket terminal 31c, energization is started and both are fused. After the fusion is finished, the system is left to cool, and after the cooling is finished, the clamp device is removed.

  According to the present embodiment, since the roller 9 rotates when clamping, friction does not occur between the roller 9 and the presser plate 13, and parts do not wear. Since the parts do not wear, there is little need for coating. Furthermore, the clamp does not loosen, and there is no need to replace parts due to the loosening. Since the eccentric shaft 11 is provided with a bearing as a non-supply bush so that the roller can be rotated more easily, the operability of the lever 23 for holding the pipe joint 31 and the resin pipe 33 with a clamp is also improved. Further, since the rotary shaft 7 is supported at the two locations 3a and 3b of the arm 3 and is supported at both ends, the force due to the rotation of the lever 23 can be supported more stably even if the arm 3 is reduced in weight. it can. Further, since the lever 23 is provided in the gap between the two portions 3a and 3b of the arm 3, the rotation of the lever 23 is guided by the gap portion, and the operability can be improved.

(Second Embodiment)
FIG. 7 is a plan view of the second embodiment of the present invention. FIG. 8 is a cross-sectional view of the second embodiment of the present invention during unclamping.

  As shown in FIG. 8, the second embodiment is an embodiment in which a lever 23 provided on the rotary shaft 7 rotates in a predetermined angle range on the opposite side of the arm 9 with respect to the roller 9. . Other configurations and operational effects are the same as those of the first embodiment.

(Third embodiment)
FIG. 9 is a cross-sectional view of the third embodiment of the present invention during unclamping. FIG. 10 is a perspective view of the third embodiment of the present invention.

  In the third embodiment, as shown in FIG. 9, the rotary shaft 7 and the eccentric shaft 11 are integrated. In the present embodiment, the lever 23 provided on the rotating shaft 7 is also integrated, but the present invention is not limited to this. In this way, the number of parts can be reduced by using an integrated structure. In FIG. 10, the mounting position of the lever 23 is that the rotating shaft 7, the eccentric shaft 11, and the lever 23 are integrally mounted between the arm 3 and the roller 9. The lever 23 may be attached to the eccentric shaft 11 separately from the arm 3 on the opposite side of the roller 9. Other configurations and operational effects are the same as those of the first embodiment. This embodiment includes the first embodiment shown in FIG. 4 in which the eccentric shaft 11 and the rotating shaft 7 are integrally formed.

DESCRIPTION OF SYMBOLS 1 Main body 3 Arm 7 Rotating shaft 9 Roller 11 Eccentric shaft 12 Locking part 13 Holding plate 23 Lever 25 Pivoting shaft 31 Pipe joint, saddle joint 31a flange 31c Flange 33 Pipe, Resin pipe

Claims (4)

A clamping device for clamping a pipe joint (31) for branching a pipe (33) to the pipe (33),
A main body (1) surrounding a part of the periphery of the pipe (33), and a locking part (12) provided at one end of the main body for locking one end of a flange (31d) of the pipe joint (31) A clamp device comprising an arm (3) pivotally attached to the other end of the main body (1) by a pivot shaft (25),
The arm (3) includes an eccentric shaft (11) fixed to a rotation shaft (7) provided on the arm (3), a roller (9) rotating around the eccentric shaft (11), and the pivot. A presser plate (13) that is slidably provided on the arm (3) in parallel with the receiving shaft (25),
By rotating the rotating shaft (7), the roller (9) presses the other end (31d) of the flange of the pipe joint (31) via the presser plate (13), and the pipe joint ( 31) A clamping device in which 31) can be held in close contact with the tube (33) placed in the main body.   The rotating shaft (7) is rotatably supported by the arm (3) at two axial positions (3a, 3b), and in the gap between the two axial positions (3a, 3b) The clamping device according to claim 1, wherein the lever (23) provided in (7) is rotated within a predetermined angle range.   The lever (23) provided on the rotating shaft (7) is configured to rotate within a predetermined angle range on the opposite side to the roller (9) with the arm (3) interposed therebetween. Clamping device.   When the roller (9) presses the other end (31d) of the flange of the pipe joint (31) through the presser plate (13), the lower surface of the presser plate (13) near the pipe joint (31). The clamping device according to any one of claims 1 to 3, wherein the end portion presses a boundary portion between the flange portion (31a) of the pipe joint (31) and the other end portion (31d) of the flange. .

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