JP2013138571A - Pushing machine of wedge-type anchor clamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a reduction in weight of a pushing machine of a wedge-type anchor clamp used for wiring work, and further to allow a wedge to be pushed into the wedge-type anchor clamp with excellent workability.SOLUTION: A pushing machine 21 is constituted of: a frame body 22 mounted in a movable manner on inner surfaces of a pair of coupling plates 52; and a hydraulic cylinder 23 that is detachably inserted and fixed into a cylinder insertion hole formed on the frame body 22. The pushing machine 21 can be mounted at a portion surrounded by a wedge 42 inserted in a temporary manner into a clamp main body 41, the pair of coupling plates 52 and a link member 51 and can perform pushing operation of the wedge 42 by extension movement of the hydraulic cylinder 23. A center line of the hydraulic cylinder 23 is positioned on the same line as a center line of the wedge 42. On the frame body 22, a fall prevention pin 32 for holding and fixing a protrusion portion 28 of the hydraulic cylinder 23 is detachably provided while guide members 25 and 26 slidably brought into contact with upper surfaces of the coupling plates 52 at wedge type anchor clamp 40 sides are being provided.

Description

  The present invention relates to a wedge-type retention clamp pusher, and more particularly to a wedge-type retention clamp pusher used to attach an electric wire such as a power transmission line to a steel tower.

  The wedge-type retention clamp is a device in which a wedge is press-fitted into a clamp body, an electric wire is integrated with the wedge-type retention clamp, and is attached to a steel tower via an insulator device (for example, see Patent Documents 1 and 2).

  Conventionally, as shown in FIG. 9, the offset type pusher a has a pin 4 on the other end of a pair of straps (connection plates) 3 and 3, one end of which is connected to the clevis 2 on both sides of the clamp body 1. , 4 are detachably provided.

  The pusher A includes a connection reinforcing block 5 connected to the straps 3, 3, a hydraulic cylinder 6 provided on one end face side of the block 5, and a drive shaft (plunger) protruding from the other end face of the block 5. 7 and a pressing block 8 provided at the end of 7.

  The block 8 has a notch (not shown) into which the electric wire W is inserted, and the axis of the drive shaft 7 has an offset from the axis of the wedge 9. The hydraulic cylinder 6 is connected to a hydraulic pump P with a pressure gauge 12 having a handle 11 and a hydraulic hose H. Thereby, the wedge 9 can be press-fitted into the clamp body 1 through the block 8 by extending the drive shaft 7 that supplies hydraulic pressure to the hydraulic cylinder 6.

JP-A-6-189433 (FIG. 2) Japanese Patent Laying-Open No. 2011-234596 (FIG. 3)

  However, since the offset type pusher A has an offset L between the axial center position of the drive shaft 7 and the axial center position of the wedge 9, the output of the drive shaft 7 does not act on the wedge 9 efficiently. Has the disadvantages.

  FIG. 10 shows a wedge type retention clamp (MAT) pusher according to another conventional example. The pusher 300 includes a hydraulic cylinder 10 and a frame body 80, and the hydraulic cylinder 10 transmits a cylinder stroke. A jar (not shown) and a hydraulic inlet 20 are provided. The wedge-type retention clamp 200 includes a clamp body 50, a clamp attachment plate 55, and a connection plate 60. The frame body 80 includes a claw portion 83 that is hooked and fixed to the clamp attachment plate 55 and a screw hole (not shown) for attaching the hydraulic cylinder 10.

  When the wedge 70 is press-fitted into the gap between the clamp body 50 and the electric wire 90, the claw portion 83 is inserted and fixed in the gap between the clamp attachment plate 55 and the clamp body 50. Subsequently, hydraulic pressure is applied from the hydraulic pressure inlet 20, and the wedge 70 is pushed to the position where the marking line 71 of the wedge 70 and the end surface of the clamp body 50 coincide with each other by pressing the wedge 70 with the plunger.

  By the way, since the frame of the pushing machine is an iron member having a length of 50 cm or more, its own weight becomes 10 kg or more and the weight of the hydraulic cylinder is added to this weight. The overall weight further increases.

  For this reason, in the overhead line work on the steel tower of a power transmission line, it became the cause by which workability | operativity by a pushing machine falls remarkably. In addition, since it was inconvenient for carrying the pusher, it was strongly desired to reduce the weight of the pusher.

  Therefore, there is a technical problem to be solved in order to reduce the weight of the pusher of the wedge-type retention clamp and make the overhead wire work easy, and the present invention solves this problem. Objective.

  The present invention has been proposed to achieve the above object, and the invention according to claim 1 is a pair of couplings extending parallel to each other to a clamp body into which a wedge for gripping and fixing an overhead power transmission line is pushed. In a pushing machine for a wedge-type retention crank in which one end portions of the plates are connected and a link member for connecting a support is connected to the other end portions of the pair of connecting plates, the pushing machine is located inside the pair of connecting plates. And a pair of hydraulic cylinders that are detachably inserted and fixed in cylinder insertion holes formed in the frame, and the wedges temporarily attached to the clamp body and the pair The pusher is formed so that it can be attached to a pusher set location surrounded by the connecting plate and the link member, and the wedge can be pushed by the extension operation of the hydraulic cylinder. When To provide a press-in machine of that wedge-shaped anchor clamp.

  According to this configuration, the pusher is attached to the pusher set portion surrounded by the wedge temporarily inserted into the clamp body, the pair of connecting plates, and the link member, and in this state, the hydraulic cylinder of the pusher is extended. Make it work. Thereby, the wedge is pushed in the pushing direction on the clamp body side, and the wedge reaches the predetermined pushing position, whereby the pushing operation of the wedge is completed.

  When this pusher is used by being mounted inside a wedge-type retention clamp, the length of the frame of the pusher becomes shorter than that of the conventional example. Further, it is not necessary to form a structure portion for coupling with the clamp body on the drive shaft side of the hydraulic cylinder, and the structure is simplified.

  According to a second aspect of the present invention, there is provided the pushing machine for the wedge type retention clamp according to the first aspect, wherein the center line of the hydraulic cylinder is located on the same line as the center line of the wedge.

  According to this configuration, since the center line of the hydraulic cylinder is arranged so as to be located on the same line as the center line of the wedge, a bending load is not applied to the frame body.

  According to a third aspect of the present invention, there is provided a wedge-type retention clamp according to the first aspect, wherein a guide member that is slidably brought into contact with the upper surfaces of the pair of connecting plates is provided on both side portions of the frame. Provide an indenter.

  According to this configuration, the lower surface of the guide member provided on the frame body is slidably brought into contact with the upper surfaces of the pair of connecting plates. Accordingly, the frame body moves smoothly along the inner surfaces of the pair of connecting plates.

  According to a fourth aspect of the present invention, the hydraulic cylinder has a protrusion, and the protrusion is held and fixed by a fall prevention pin that is detachably attached to the frame. A wedge-type retention clamp pusher according to 1 or 2 is provided.

  According to this configuration, the hydraulic cylinder fixed to the frame can be separated by removing the fall prevention pin from the frame. Therefore, the separated hydraulic cylinder can be used as a drive source for operations other than the wedge pushing operation (for example, wedge pulling operation).

  According to the first aspect of the present invention, the frame of the pusher is shortened, and it is not necessary to form a structural part such as a connecting block part on the drive shaft side of the hydraulic cylinder. Therefore, it is possible to reduce the weight of the pusher and simplify the structure, and to mass-produce the pusher at a low cost.

  By reducing the weight of the pushing machine, it is possible to greatly reduce the work burden in the work of overhead lines of power transmission lines on the steel tower and the transportation work other than the overhead line work. In particular, the wedge can be pushed into the wedge-type retaining clamp with good workability, so that the wedge pushing operation can be performed more easily and quickly than in the prior art.

  According to the second aspect of the present invention, since the bending load is not applied to the frame body, in addition to the effect of the first aspect of the invention, the wedge pushing efficiency can be greatly improved. In addition, since a light metal can be adopted as the material of the frame, the weight of the frame can be further reduced.

  In the invention described in claim 3, since the frame smoothly slides along the inner surfaces of the pair of connecting plates on the wedge-type retention clamp side, in addition to the effect of the invention described in claim 1, the hydraulic cylinder for pushing in the wedge is provided. Less driving force is required, and a smaller and lighter hydraulic cylinder can be used.

  The invention according to claim 4 can prevent the hydraulic cylinder from dropping from the frame body by the fall prevention pin. Further, since the hydraulic cylinder can be separated from the frame by removing the fall prevention pin, in addition to the effect of the invention of claim 1 or 2, a driving source other than the pushing of the wedge, for example, the wedge is pulled out. It can also be used effectively as a driving source.

The pushing machine by this invention is shown, (a) is a top view, (b) is a front view, (C) is a side view. The frame which concerns on a pushing machine same as the above is shown, (a) is a top view, (b) is a front view, (C) is a side view. The hydraulic cylinder which concerns on a pushing machine same as the above is shown, (a) is a top view, (b) is a front view, (C) is a side view. The fall prevention pin which concerns on a pushing machine same as the above is shown, (a) is a top view, (b) is a front view, (C) is a side view. The top view of the wedge type | mold retention clamp which concerns on this invention. The front view of the wedge type | mold retention clamp which concerns on this invention. Explanatory drawing of the principal part which shows the state when a pushing machine is assembled | attached to the wedge type | mold retention clamp which concerns on this invention, and a wedge is pushed in. Explanatory drawing which shows the state when a hydraulic cylinder is assembled | attached to the wedge type | mold retention clamp which concerns on this invention, and a wedge is pulled out. Functional operation explanatory drawing of the pushing machine which concerns on a prior art example. Functional operation explanatory drawing of a pushing machine concerning other conventional examples.

  The present invention achieves the object of reducing the weight of a pushing machine for a wedge-type retention clamp used for overhead line work of an overhead power transmission line, and enabling the wedge to be pushed into the wedge-type retention clamp with good workability. In order to do this, one end of a pair of connecting plates extending parallel to each other is connected to a clamp body into which a wedge for holding and fixing an overhead power transmission line is pushed, and a support is connected to the other end of the pair of connecting plates In a wedge type retaining crank pushing machine in which link members are connected, the pushing machine is movably mounted inside a pair of connecting plates, and a cylinder is formed in the frame. A hydraulic cylinder that is detachably inserted into and fixed to the hole, and the pusher is placed in a pusher set location surrounded by the wedge, the pair of connecting plates, and the link member that are temporarily inserted into the clamp body. I can put it on It is formed on, by extension operation of the hydraulic cylinder, and configured to allow the pushing operations of the wedge.

  Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS. FIG. 1 shows an assembly drawing of the pusher. In FIG. 1, the pusher 21 is schematically configured by a frame body 22 having a cylinder mounting portion and a hydraulic cylinder 23 that is detachably mounted on the cylinder mounting portion of the frame body 22. The pusher 21 is used by being mounted in a space (a pusher set location) inside a wedge-type retention clamp 40 described later.

  As shown in FIG. 2, the frame body 22 has a pair of side surface portions 24, 24 extending in parallel with each other, and the pair of side surface portions 24, 24 are separated by a predetermined dimension in the width direction of the frame body 22. ing. Guide portions 25 and 26 are provided in the vicinity of the distal end portion and the base end portion of the pair of side surface portions 24 and 24, respectively, and the guide portions 25 and 26 protrude outward in the width direction of the pair of side surface portions 24 and 24.

  The lower surfaces of the guide portions 25 and 26 are slidably in contact with inner surfaces of a pair of connecting plates 52 and 52 described later, and the lower surfaces of the guide portions 25 and 26 are formed smoothly. Further, the base end portions of the pair of side surface portions 24, 24 are integrally coupled via the connecting portion 27.

  As shown in FIG. 2C, a cylindrical cylinder insertion hole 29 is formed on the base end surface side of the connecting portion 27, and the hydraulic cylinder 23 is detachably attached to the cylinder insertion hole 29. .

  As shown in FIG. 2 (a), a slit portion 30 having a U-shape in plan view is formed in the upper portion of the cylinder insertion hole 29. The slit portion 30 has a hydraulic cylinder 23 side shown in FIG. The protrusion 28 is configured to fit. Furthermore, a pair of pin holes 31 and 31 are provided on both sides in the width direction across the slit portion 30 in the connecting portion 27, and the pair of pin holes 31 and 31 are disposed so as to face each other.

  A pair of pin holes 31, 31 are detachably mounted with a fall prevention pin 32 with a circular head 33 shown in FIG. 4. The fall prevention pin 32 has a protrusion 28 on the hydraulic cylinder 23 side as a slit portion. It is held and fixed in the state engaged with 30. As a result, the hydraulic cylinder 23 mounted in the cylinder insertion hole 29 is prevented from falling (detaching).

  On the other hand, as shown in FIG. 3, the protrusion 28 is provided on the upper part of the base end side of the hydraulic cylinder 23, and a hydraulic pressure inlet 34 is formed in the protrusion 28. The hydraulic inlet 34 is connected to a hydraulic pump with a handle via a hydraulic hose, as in the conventional example shown in FIG.

  A plunger 35 is provided on the proximal end side of the hydraulic cylinder 23. The plunger 35 extends by supplying hydraulic pressure to the hydraulic cylinder 23 and transmits the cylinder stroke.

  Here, the weight of the pusher 21 will be described. Since the pusher 21 is composed of a simple frame 22 and a hydraulic cylinder 23, the weight of the pusher 21 as a whole is reduced to 4.9 kg.

  Incidentally, the pusher 21 of the present invention is significantly lighter than the weight of a conventional pusher of the same size as that of the pusher (15 kg for the MAT pusher and 10.5 kg for the MBT pusher).

  In order to reduce the weight of the pusher 21, a configuration in which the wedge member 42 is pushed by the link member 51 on the wedge-type retention clamp 40 side and the reinforcement structure portion on the pusher side that has been conventionally required is eliminated. , Has contributed greatly.

  Incidentally, since the pushing tool used in the conventional example needs to be provided with a reinforcing structure such as a frame member or a block on both the hydraulic cylinder and the plunger, the weight of the pushing machine itself has increased.

  Next, the structure of the wedge type retaining clamp 40 to which the pusher 21 is attached will be described. As shown in FIG. 5, the wedge-type retention clamp 40 includes a clamp body 41 having a wedge press-fitting portion, and two upper and lower sheets that are pressed into the wedge press-fit portion of the clamp main body 41 to grip and fix the electric wire W. And a wedge 42.

  A concave mounting portion 43 for a cylinder is formed on the upper surface of the upper wedge 42, and the concave mounting portion 43 extends in the longitudinal direction of the wedge 42. The cross-sectional shape of the concave mounting portion 43 is formed in a shape that follows the lower arc surface of the wedge 42, for example, a substantially V shape, a substantially U shape, or an arc shape. Thereby, the hydraulic cylinder 23 is stably mounted on the concave mounting portion 43.

  A wide slide portion 45 is disposed on the base end side of the wedge 42, and a pair of bolt holes (not shown) are formed at predetermined positions of the slide portion 45. The base ends of the upper and lower wedges 42 that grip the electric wire W are fastened and fixed by passing a pair of wedge tightening bolts 44 through the pair of bolt holes.

  The pair of wedge tightening bolts 44, 44 are spaced apart from each other in the width direction of the slide portion 45 (the vertical direction in FIG. 5), and can also function as a cylinder lateral displacement prevention member. That is, the pair of wedge tightening bolts 44, 44 abuts and holds both side surfaces of the base end portion of the hydraulic cylinder 23 placed on the wedge 42, thereby driving the hydraulic cylinder 23 in the width direction. The positional deviation of is controlled.

  The dimension of the slide portion 45 in the width direction is set to be approximately the same as the distance between the inner surfaces of the pair of connecting plates 52 and 52. As described above, the outer side surface in the width direction of the slide portion 45 is formed smoothly, and is slidably contacted and fitted to the inner surfaces of the pair of connecting plates 52 and 52.

  Further, a cylinder receiving portion 46 projects from the upper surface of the slide portion 45, and the cylinder receiving portion 46 protrudes so as to face the upper end surface on the inner side in the axial direction of the clamp body 41. The cylinder receiving portion 46 abuts on the base end surface of the hydraulic cylinder 23 in the axial direction and receives the extension operation of the hydraulic cylinder 23.

  The wedge-type retention clamp 40 includes a pair of connecting plates 52 and 52 and a link member 51 as described above. One end portions of the pair of connecting plates 52 and 52 are rotatably supported on both side portions of the clamp body 41 by a round head bolt 48 and a round nut 49, respectively.

  The link member 51 is connected to the other end portions of the pair of connecting plates 52 and 52 by a cotter bolt 54. A fixing bolt 53 and a guide bolt 56 are attached to a connecting portion between the link member 51 and the connecting plates 52 and 52. Further, as shown in FIG. 6, a jumper fitting 57 is fixed to the lower surface side of the clamp body 41 with jumper fitting mounting bolts 58. An electric wire retainer 59 is provided on the front end side of the jumper fitting 57.

  Next, the operation of this embodiment will be described. It is assumed that the pusher 21 is assembled in the state shown in FIG. That is, the hydraulic cylinder 23 is inserted into the cylinder insertion hole 29 on the connecting portion 27 side of the frame body 22, and the protruding portion 28 of the hydraulic cylinder 23 is fitted to the slit portion 30 on the connecting portion 27 side. In this state, it is assumed that the fall prevention pin 32 is attached to the pin holes 31 and 31 to prevent the hydraulic cylinder 23 from falling.

  Thus, when the wedge 42 is pushed into the clamp body 41 in order to grip and fix the electric wire W to the wedge-type retention clamp 40, as shown in FIG. The pusher 21 is fitted and set in a space (recess) surrounded by the pair of connecting plates 52, 52, the link member 51, and the wedge 42.

  In this set state, the end surfaces of the side surfaces 24, 24 of the frame body 22 face the end surface of the slide portion 45 on the wedge 42 side, and the end surface of the plunger 35 of the hydraulic cylinder 23 faces the inner end surface of the link member 51. Are arranged as follows.

  Further, the lower surfaces of the guide portions 25 and 26 on the pair of side surface portions 24 and 24 are set so that they can slide along the upper surface of the connecting member 51 on the wedge-type retention clamp 40 side.

  After setting, the hydraulic pressure is supplied to the hydraulic inlet 34 of the hydraulic cylinder 23 by operating the handle of the hydraulic pump. Thereby, the hydraulic pressure of the hydraulic cylinder 23 rises to a specified value, and the plunger 35 extends.

  The wedge 42 is moved toward the clamp body 41 by the extension operation of the plunger 35 and reaches a predetermined pushing position, whereby the pushing operation of the wedge 42 is completed.

  Thereafter, the handle operation of the hydraulic pump is released, the plunger 35 is retracted from the wedge 42, and the pusher 21 is removed from the wedge-type retention clamp 40.

  The pushing machine 21 according to the present embodiment can also be used when the wedge 42 that is press-fitted into the clamp body 41 is pulled out. In this pulling operation, first, the fall prevention pin 32 is pulled out from the pin holes 31, 31, and the hydraulic cylinder 23 is detached from the frame body 22 and separated.

  Then, as shown in FIG. 8, only the separated single hydraulic cylinder 23 is fitted and set in a cylinder set portion surrounded by the slide portion 45 of the wedge 42, the clamp body 41, and the pair of connecting plates 52 and 52. . In this set state, the hydraulic cylinder 23 is automatically positioned with respect to the wedge 42 by engaging the lower portion of the hydraulic cylinder 23 with the concave mounting portion 43 of the wedge 42.

  Further, the plunger 35 on the tip side of the hydraulic cylinder 23 is set so as to face the upper end surface of the clamp body 41. Further, the base portion of the hydraulic cylinder 23 is disposed between the pair of wedge tightening bolts 54 and 54, and the base end surface of the hydraulic cylinder 23 is set so as to face the cylinder receiving portion 46.

  After setting, hydraulic pressure is supplied to the hydraulic inlet 34 of the hydraulic cylinder 23 by operating the handle of the hydraulic pump. Thereby, the hydraulic pressure of the hydraulic cylinder 23 rises to a specified value, and the plunger 35 extends.

  Then, by the extension operation of the plunger 35, the wedge 42 moves to a predetermined extraction position, whereby the extraction operation of the wedge 42 is completed. In this case, the drawing pressure is considerably reduced as compared with the conventional example.

  Thereafter, the handle operation of the hydraulic pump is released, the plunger 35 is moved backward with respect to the cylinder receiving portion 46 on the wedge 42 side, and the hydraulic cylinder 23 is removed from the wedge-type retention clamp 40.

  Thus, in this embodiment, since the cylinder receiving portion 46 facing the inner end face of the clamp body 41 is provided on the wedge 42 side, only the hydraulic cylinder 23 is fitted into the cylinder set location in the wedge-type retention clamp 40. After that, the wedge 35 can be pulled out from the clamp body 41 by extending the plunger 35.

  As described above, the pushing machine according to the present invention can be used by simply fitting it into the pushing machine set portion surrounded by the pair of connecting plates, the link member and the wedge of the clamp body. The wedge can be pushed into the wedge-type retention clamp, and the wedge can be pushed in more easily and quickly than the conventional example.

  In this case, since the center line in the load direction for pushing the wedge and the axial center line of the plunger of the hydraulic cylinder are located on the same line, there is no possibility that a bending load is generated on the frame.

  In addition, unlike the conventional example, there is no need to provide a structural part such as a block for joining the frames, and the frame can be formed of a light material such as an aluminum light alloy, coupled with the shortening of the frame. The pusher can be significantly reduced in weight.

  Thus, by reducing the weight of the pushing machine, it is possible to significantly reduce the work load in comparison with the conventional work in the work of the overhead line of the transmission line on the steel tower and the transport work other than the overhead line work.

  Furthermore, not only is the structure part for connecting to the clamp body unnecessary on the piston side of the hydraulic cylinder, but in particular, when pushing the wedge, a tight load is applied to the overhead power transmission line, and then the pushing tool is used. By pushing the wedge, the cylinder stroke can be further shortened.

  Also, after the fall prevention pin is removed, the hydraulic cylinder separated from the frame is set inside the pair of coupling plates on the clamp body side, and then the wedge is pulled out easily and quickly by driving the hydraulic cylinder to extend. be able to.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones. For example, the assembling procedure of the pusher and the procedure at the time of pushing in or pulling out the wedge are not limited to the above method.

  The present invention can also be applied to a pushing machine other than the pushing machine of the wedge type retention clamp.

DESCRIPTION OF SYMBOLS 21 Pusher 22 Frame 23 Hydraulic cylinder 24 Side part 25 Guide part 27 Connection part 28 Protrusion part 29 Cylinder insertion hole 31 Pin hole 32 Fall prevention pin 40 Wedge type clamp 41 Clamp main body 42 Wedge 43 Concave mounting part 44 Wedge tightening bolt 45 Slide portion 46 Cylinder receiving portion 51 Link member 52 Connecting plate W Electric wire (aerial transmission and distribution wire)

Claims (4)

One end of a pair of connecting plates extending parallel to each other is connected to a clamp body into which a wedge for holding and fixing an overhead power transmission line is pushed, and a link member for connecting a support to the other end of the pair of connecting plates In the wedge-type retaining crank pusher,
The pusher includes a frame body that is movably mounted inside a pair of connecting plates, and a hydraulic cylinder that is detachably inserted and fixed in a cylinder insertion hole formed in the frame body,
Formed so that the pusher can be attached to a pusher set location surrounded by the wedge, the pair of connecting plates, and the link member temporarily inserted into the clamp body,
A wedge-type retention clamp pusher configured to perform the wedge push-in operation by an extension operation of the hydraulic cylinder.   2. The wedge-type retention clamp pusher according to claim 1, wherein the center line of the hydraulic cylinder is located on the same line as the center line of the wedge.   2. The wedge-type tension clamp pushing machine according to claim 1, wherein guide members that are slidably brought into contact with the upper surfaces of the pair of connecting plates are provided on both side surfaces of the frame. 3. The wedge-type retention device according to claim 1, wherein the hydraulic cylinder has a protrusion, and the protrusion is held and fixed by a fall prevention pin removably attached to the frame body. Clamp pusher.

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