Pantograph unit for trolley wire

Abstract

To provide a wire gripper 10 capable of suppressing deformation of a trolley wire T.SOLUTION: A wire gripper 10 includes a wire gripping section 11 for gripping a trolley wire T, and a pair of connection sections 25 to which a wire tensioner 30 is connected. Each of the pair of connection sections 25 is plane-symmetrical with respect to an XY plane including a central axis of the trolley wire T, and is plane-symmetrical with respect to an XZ plane including the central axis of the trolley wire T.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a gripping device for trolley wires.

Background Art

[0002] A trolley wire is an electric wire arranged above the track of a moving body such as a railway vehicle. The trolley wire contacts the pantograph of the moving body to supply power to the moving body. When partially replacing the trolley wire, a cutting operation of the trolley wire is involved. A pair of gripping devices and a wire tensioning device are used for the cutting operation of the trolley wire.

[0003] FIGS. 7 and 8 are explanatory views of a cutting operation of a conventional trolley wire. FIG. 7 shows a state before applying tension by the wire tensioning device, and FIG. 8 shows a state after applying the tension. In the present application, the Z direction, X direction, and Y direction in the orthogonal coordinate system are defined as follows. The Z direction is the vertical direction, and the +Z direction is the upward direction. The X direction and Y direction are the horizontal directions. The X direction is a direction parallel to the extending direction of the trolley wire T. In the X direction, the inside of the pair of gripping devices 90 may be referred to as the "inside", and the outside of the pair of gripping devices 90 may be referred to as the "outside". The Y direction is a direction perpendicular to the trolley wire T. In the Y direction, the direction approaching the trolley wire T may be referred to as the "inside", and the direction away from the trolley wire T may be referred to as the "outside".

[0004] As shown in FIG. 7, the gripping device 90 (see, for example, Patent Documents 1 and 2) has a gripping portion 91 and a lever 92. The gripping portion 91 grips the trolley wire T. The lever 92 is connected to the gripping portion 91. The tip of the lever 92 is arranged away from the trolley wire T. By rotating the lever 92, the gripping portion 91 opens and closes. A pair of gripping devices 90 are arranged on both sides of the cutting portion (for example, the center C) of the trolley wire T. Hereinafter, the trolley wire T inside the pair of gripping devices 90 is referred to as the inner trolley wire T1, and the trolley wire T outside the pair of gripping devices 90 is referred to as the outer trolley wire T0.

[0005] The wire tensioner 80 has a tension wire 81 and a winding mechanism 82. The tension wire 81 is a chain, a wire, or the like. The tension wire 81 is stretched between the tips of the levers 92 of a pair of wire grippers 90. The winding mechanism 82 applies tension to the tension wire 81 by winding it up. As shown in FIG. 8, when tension is applied to the tension wire 81, the tension of the inner trolley wire T1 is relaxed. With the tension relaxed, the inner trolley wire T1 is cut.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] As shown in FIG. 7, the lever 92 is arranged away from below the trolley wire T. There is a gap G between the tension wire 81 stretched between the levers 92 of the pair of wire grippers 90 and the trolley wire T. As shown in FIG. 8, when tension is applied to the wire tensioner 80, a tension axis is generated along the tension wire 81. When the tension axis of the wire tensioner 80 and the tension axis of the outer trolley wire T0 are arranged on the same straight line, the tensions acting on the wire gripper 90 balance.

[0008] The tension wire 81 to which tension has been applied moves upward and is arranged on the same straight line as the outer trolley wire T0. The inner trolley wire T1 with relaxed tension also moves upward and deviates from the same straight line as the outer trolley wire T0. The movement of the tension wire 81 and the inner trolley wire T1 is realized by the rotation of the wire gripper 90. At the position P of the rotation center between the wire gripper 90 and the outer trolley wire T0, the trolley wire T undergoes plastic deformation.

[0009] The deformation of the trolley wire was analyzed by simulation. FIG. 9 is a perspective view of a simulation model of a conventional wire gripper. The model of the wire gripper 90 has a wire gripping portion 91 and a lever 92, similar to the actual wire gripper 90. The relative position between the wire gripping portion 91 and the trolley wire T is fixed. The lever 92 is arranged away from the trolley wire T. A boundary condition corresponding to the tension of the wire tensioner 80 is set at the tip of the lever 92.

[0010] FIG. 10 is a graph of the simulation results of a conventional wire gripper. After the boundary condition corresponding to the tension of the wire tensioner 80 is eliminated, the shape of the trolley wire T sagging due to gravity is shown in FIG. 10. The vertical axis of FIG. 10 is the displacement amount of the sag due to gravity. The horizontal axis of FIG. 10 is the distance in the X direction from the center C of the inner trolley wire T1. The wire gripper 90 is arranged at the position where X = 1.5 m. At the position P outside the wire gripper 90 in the X direction, the trolley wire T is deformed in the -Z direction. The result of the simulation reproduces the result of the experiment.

[0011] The deformed part of the trolley wire T protrudes downward. When the pantograph of the moving body in motion abuts against the deformed part of the trolley wire T, an impact force acts on the deformed part. As a result, the durability of the trolley wire T is reduced. As a countermeasure, after the trolley wire T is cut or after the replacement of the trolley wire T is completed, etc., the deformed part of the trolley wire T is repaired (smoothed out). However, this repair work is complicated.

[0012] The problem to be solved by the present invention is to provide a wire gripper capable of suppressing the deformation of the trolley wire.

Means for Solving the Problem

[0013] The wire gripper of the present invention has a wire gripping portion for gripping a trolley wire and a pair of connection portions to which a wire tensioner is connected. The pair of connection portions intersect a first plane each including the central axis of the trolley wire and are arranged on both sides of a second plane including the central axis of the trolley wire and perpendicular to the first plane.

[0014] When tension is evenly applied to a pair of connection parts by a wire tensioner, the tension axis by the wire tensioner is generated near the first plane and the second plane. That is, the tension axis by the wire tensioner is generated near the central axis of the trolley wire. In the process of the tension acting on the wire gripper being balanced, the wire gripper hardly rotates. Therefore, the deformation of the trolley wire held by the wire gripper is suppressed.

[0015] The first plane is a horizontal plane. At this time, the pair of connection parts are arranged at the same position in the vertical direction. Thereby, it is easy to apply uniform tension to the pair of connection parts.

[0016] The pair of connection parts are plane-symmetrical with respect to the second plane. The pair of connection parts are plane-symmetrical with respect to the first plane. At this time, the tension axes by the pair of wire tensioners are generated at the position of the central axis of the trolley wire. Thereby, even if the wire gripper does not rotate, the tension acting on the wire gripper is balanced. Therefore, the deformation of the trolley wire held by the wire gripper is suppressed.

Effect of the Invention

[0017] With the wire gripper of the present invention, the deformation of the trolley wire can be suppressed.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Mode for Carrying Out the Invention

[0019] Hereinafter, the wire gripper of the embodiment will be described with reference to the drawings. FIG. 1 is a perspective view of a simulation model of the wire gripper of the embodiment. The wire gripper 10 of the embodiment includes a wire gripping portion 11 and a pair of connecting portions 25. The wire gripping portion 11 is a portion that grips the trolley wire T. The wire gripping portion 11 grips the trolley wire T within a range of a predetermined length in the X direction. In the model of FIG. 1, the relative position between the wire gripping portion 11 and the trolley wire T is fixed.

[0020] The connecting portion 25 is connected to the wire gripping portion 11. The connecting portion 25 is a portion to which a wire tensioner (not shown) is connected. A pair of wire tensioners are connected to the pair of connecting portions 25. The pair of wire tensioners apply tension evenly to the pair of connecting portions 25. In the model of FIG. 1, boundary conditions corresponding to the tension of the pair of wire tensioners are set for the pair of connecting portions 25.

[0021] The pair of connecting portions 25 are arranged at the same position in the Z direction as the trolley wire T gripped by the wire gripping portion 11. The pair of connecting portions 25 are included in the XY plane including the central axis of the trolley wire T. The pair of connecting portions 25 are arranged on both sides in the Y direction with the trolley wire T gripped by the wire gripping portion 11 in between. The pair of connecting portions 25 are arranged symmetrically with respect to the XZ plane including the central axis of the trolley wire T.

[0022] The pair of connection parts 25 is included in the XY plane including the central axis of the trolley wire T. At this time, the tension axes by the pair of wire tensioners are generated at the same position as the trolley wire T in the Z direction. That is, the tension axes by the pair of wire tensioners and the tension axis of the outer trolley wire T0 are arranged on the same XY plane. Therefore, even if the gripper 10 does not rotate in the Z direction, the tensions acting on the gripper 10 are balanced. As a result, the deformation of the trolley wire T in the Z direction is suppressed at the position P between the gripper 10 and the outer trolley wire T0.

[0023] FIG. 2 is a graph of the simulation results of the gripper of the embodiment. After the boundary conditions corresponding to the tensions of the pair of wire tensioners are eliminated, the shape of the trolley wire T sagged by gravity is shown in FIG. 2. The horizontal axis and the vertical axis in FIG. 2 are the same as those in FIG. 10. The gripper 10 is arranged at the position where X = 1.5 m. At the position P outside the gripper 10, the trolley wire T is not deformed in the Z direction. The effect of suppressing the deformation of the trolley wire T by the gripper 10 of the embodiment was confirmed by simulation.

[0024] The pair of connection parts 25 is arranged symmetrically with respect to the XZ plane including the central axis of the trolley wire T. The pair of wire tensioners apply tension evenly to the pair of connection parts 25. At this time, the tension axes by the pair of wire tensioners are generated at the same position as the trolley wire T in the Y direction. That is, the tension axes by the pair of wire tensioners and the tension axis of the outer trolley wire T0 are arranged on the same XZ plane. Therefore, even if the gripper 10 does not rotate in the Y direction, the tensions acting on the gripper 10 are balanced. As a result, the deformation of the trolley wire T in the Y direction is suppressed at the position P between the gripper 10 and the outer trolley wire T0.

[0025] A specific example of the gripper 10 of the embodiment will be described. FIG. 3 is a plan view of the gripper 10 of the embodiment, FIG. 4 is a front view, and FIG. 5 is a side view. The gripper 10 is formed of a metal material such as steel. The gripper 10 has a gripping part 11 and a connection unit 20. The gripping part 11 grips the trolley wire T. As shown in FIG. 3, the gripping part 11 has a pair of gripping pieces 12. The gripping pieces 12 extend in the X direction.

[0026] As shown in FIG. 5, the gripping piece 12 has a protrusion 13 at its lower end. The protrusion 13 protrudes toward the central axis of the trolley wire T. A pair of gripping pieces 12 are arranged side by side in the Y direction. The protrusions 13 of the pair of gripping pieces 12 grip the trolley wire T. As shown in FIG. 3, a fastening member 14 is arranged on the outer portion of the gripping piece 12 in the X direction. The fastening member 14 is a bolt and a nut. The bolt of the fastening member 14 penetrates the pair of gripping pieces 12 in the Y direction. The fastening member 14 exerts a fastening force in the direction in which the pair of gripping pieces 12 approach each other.

[0027] The connection unit 20 includes a clamping plate 21, a pair of connection parts 25, and a reinforcing plate 28. The clamping plate 21 is formed in a flat plate shape and arranged parallel to the XZ plane. The inner portion of the gripping part 11 in the X direction is arranged on the outer portion of the clamping plate 21 in the X direction. The clamping plate 21 is arranged outside the gripping part 11 in the Y direction. A pair of clamping plates 21 clamp the gripping part 11 in the Y direction. A fastening member 22 is arranged on the outer portion of the clamping plate 21 in the X direction. The fastening member 22 is a bolt and a nut. The bolt of the fastening member 22 penetrates the pair of clamping plates 21 and the pair of gripping pieces 12 in the Y direction. The fastening member 22 exerts a fastening force in the direction in which the pair of clamping plates 21 and the pair of gripping pieces 12 approach each other.

[0028] The connection part 25 is formed in a flat plate shape and arranged parallel to the XY plane. The connection part 25 extends outward in the Y direction from the inner portion of the clamping plate 21 in the X direction. The connection part 25 is connected to the clamping plate 21 by welding or the like. A connection hole 26 is formed at the outer end of the connection part 25 in the Y direction. The connection hole 26 penetrates the connection part 25 in the Z direction. A pair of wire tensioners (not shown) are connected to the connection holes 26 of the pair of connection parts 25.

[0029] As shown in FIG. 5, a pair of connection portions 25 are arranged at the same position in the Z direction as the trolley wire T grasped by the grasping portion 11. The pair of connection portions 25 intersect the XY plane (first plane) S1 including the central axis of the trolley wire T. The pair of connection portions 25 are symmetric with respect to the first plane S1. The pair of connection portions 25 are arranged on both sides in the Y direction with the trolley wire T grasped by the grasping portion 11 interposed therebetween. The pair of connection portions 25 are arranged on both sides of the XZ plane (second plane) S2 including the central axis of the trolley wire T. The pair of connection portions 25 are symmetric with respect to the second plane S2.

[0030] The reinforcing plate 28 is formed in a flat plate shape and arranged parallel to the XY plane. The reinforcing plate 28 is arranged below the connection portion 25. As shown in FIG. 3, the reinforcing plate 28 is arranged outside the holding plate 21 in the Y direction. The reinforcing plate 28 is connected to the holding plate 21 and the connection portion 25 by welding or the like. The length of the reinforcing plate 28 in the X direction is equal to the length of the holding plate 21 in the X direction. The width of the reinforcing plate 28 in the Y direction is about half of the width of the connection portion 25 in the Y direction. The reinforcing plate 28 reinforces the rigidity of the connection portion 25.

[0031] A method of using the gripper 10 of the embodiment will be described. FIG. 6 is an explanatory diagram of a method of using the gripper of the embodiment. A pair of grippers 10 are mounted on both sides in the X direction of the cut portion of the trolley wire T. A pair of wire tensioners 30 are mounted between the pair of grippers 10.

[0032] First, the grasping portion 11 of the gripper 10 is mounted on the trolley wire T. The grasping pieces 12 of the grasping portion 11 are arranged in a state where the fastening of the fastening member 14 is loosened. The grasping pieces 12 are arranged above the trolley wire T. The trolley wire T is arranged inside the protrusions 13 of the pair of grasping pieces 12. The fastening member 14 is fastened, and the pair of grasping pieces 12 approach each other. The protrusions 13 of the grasping pieces 12 grasp the trolley wire T.

[0033] Next, the connection unit 20 of the wire gripper 10 is attached to the wire gripping portion 11. The connection unit 20 is disposed on both sides of the wire gripping portion 11 in the Y direction. The connection unit 20 is arranged such that the connection portion 25 is parallel to the trolley wire T in the XY plane. The posture of the connection portion 25 is confirmed by visual inspection from the side of the trolley wire T or the like. Since the posture of the connection portion 25 depends on the posture of the wire gripping portion 11, it is adjusted together with the posture of the wire gripping portion 11. The fastening member 22 is fastened, and the pair of clamping plates 21 approach each other. The clamping plate 21 is fixed to the wire gripping portion 11, and the attachment of the connection unit 20 is completed. Thus, the attachment of the pair of wire grippers 10 to the trolley wire T is completed.

[0034] Next, a pair of wire tensioners 30 are attached. In the example of FIG. 6, a wire turnbuckle is adopted as the wire tensioner 30. The wire turnbuckle can freely adjust the tension of the wire. The pair of wire tensioners 30 are disposed on both sides of the trolley wire T in the Y direction. The pair of wire tensioners 30 are connected to the connection holes 26 of the pair of connection portions 25 of the wire gripper 10. The wire tensioner 30 is connected to at least one (the right side in FIG. 6) of the wire grippers 10 so as to be rotatable about the Y axis and the Z axis. The pair of wire tensioners 30 are connected to the wire gripper 10 via a load cell 31. The load cell 31 measures the tension applied to the wire tensioner 30.

[0035] Next, tension is applied to the wire tensioner 30. The pair of wire tensioners 30 apply tension evenly to the pair of connection portions 25 of the wire gripper 10. The application of the even tension is adjusted based on the tension measured by the load cells 31 of the pair of wire grippers 10.

[0036] The pair of connection parts 25 are symmetric with respect to the XY plane including the central axis of the trolley wire T. The pair of connection parts 25 are symmetric with respect to the XZ plane including the central axis of the trolley wire T. Therefore, the tension axes by the pair of wire tensioners 30 are generated at the position of the trolley wire T in the Z direction and the Y direction. That is, the tension axes by the pair of wire tensioners 30 and the tension axis of the outer trolley wire T0 are arranged on the same straight line. In this state, since the tensions acting on the gripper 10 are balanced, the gripper 10 does not rotate. Therefore, the deformation of the trolley wire T at the position P between the gripper 10 and the outer trolley wire T0 is suppressed.

[0037] With the tension of the inner trolley wire T1 relaxed, the inner trolley wire T1 is cut. Thereafter, partial replacement of the trolley wire or the like is carried out.

[0038] As described in detail above, the gripper 10 of the embodiment has a gripping part 11 that grips the trolley wire T and a pair of connection parts 25 to which the wire tensioners 30 are connected. The pair of connection parts 25 are each symmetric with respect to the XY plane including the central axis of the trolley wire T and symmetric with respect to the XZ plane including the central axis of the trolley wire T. When tension is evenly applied to the pair of connection parts 25 by the wire tensioners 30, the tension axes by the wire tensioners 30 are generated at the position of the trolley wire T. In this state, since the tensions acting on the gripper 10 are balanced, the gripper 10 does not rotate. Therefore, the deformation of the trolley wire T held by the gripper 10 is suppressed.

[0039] As described above, one embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and modifications, combinations, deletions, etc. of the configuration within the scope not departing from the gist of the present invention are also included.

[0040] The gripper 10 of the embodiment is attached to the trolley wire T so that the connection part 25 is parallel to the XY plane. On the other hand, the gripper 10 may be attached to the trolley wire T so that the connection part 25 is parallel to the XZ plane.

Explanation of reference numerals

[0041] S1…the first plane, S2…the second plane, T…the trolley line, 10…the gripper, 11…the gripping part, 25…the connecting part, 30…the wire stretcher.

Claims

**Claim 1**: A trolley wire gripping unit having a pair of trolley wire grippers mounted on both sides of a cut portion of the trolley wire in the extending direction of the trolley wire, and a pair of wire tensioners mounted between the pair of trolley wire grippers, wherein: each of the pair of trolley wire grippers has: a gripping portion for gripping the trolley wire; and a pair of connection portions to which the pair of wire tensioners are respectively connected; the pair of connection portions intersect a first plane including the central axis of the trolley wire and are disposed on both sides of a second plane including the central axis of the trolley wire and perpendicular to the first plane; the pair of wire tensioners are disposed on both sides of the second plane; a trolley wire gripping unit. **Claim 2**: The first plane is a horizontal plane. The trolley wire gripping unit according to claim 1. **Claim 3**: The pair of connection portions are symmetric with respect to the second plane. The trolley wire gripping unit according to claim 1 or 2. **Claim 4**: The pair of connection portions are symmetric with respect to the first plane. The trolley wire gripping unit according to any one of claims 1 to 3.

Images