WO2021172534A1

WO2021172534A1 - Tension balancer for overhead line

Info

Publication number: WO2021172534A1
Application number: PCT/JP2021/007428
Authority: WO
Inventors: 陽平田生; 崇史原田; 達哉今井; 治佐々
Original assignee: 日本発條株式会社
Priority date: 2020-02-27
Filing date: 2021-02-26
Publication date: 2021-09-02
Also published as: JP2021133816A; CN115103783A; JP7427473B2; KR20220144800A

Abstract

[Problem] To provide a tension balancer for an overhead line with which stroke length can be increased within a set load range by reducing the hysteresis loss of a deflection-load characteristic. [Solution] An outer wire 201 and/or an outer auxiliary washer 102b that obstructs contact between an outer spring washer 102a and an outer cylinder member 101 is provided between the outer cylinder member 101 and a first intermediate cylinder member 102, and the frictional resistance of the outer wire 201 or the outer auxiliary washer 102b with respect to the outer spring washer 102a or the outer cylinder member 101 is less than the frictional resistance of the outer spring washer 102a with respect to the outer cylinder member 101.

Description

Tension balancer for overhead lines

The present invention relates to a tension balancer for an overhead line that gives tension to the overhead line.

A tension balancer for overhead lines that applies tension to overhead lines such as railways by coil springs is known. For example, Patent Document 1 discloses an overhead wire tension balancer in which a coil spring is interposed between a plurality of cylindrical members arranged coaxially.

Japanese Unexamined Patent Publication No. 2009-296795

By the way, the following issues have been raised in the conventional tension balancer for overhead lines. That is, the frictional resistance between the inner peripheral surface of the tubular member of the overhead wire tension balancer and the spring washer that supports the coil spring causes a hysteresis loss in the deflection-load characteristics of the overhead wire tension balancer during expansion and contraction. .. In the conventional tension balancer for overhead lines, due to its hysteresis loss, it may not be possible to secure a stroke length corresponding to an increase in the amount of expansion and contraction of the overhead line within a set load range.

Against this background, the present invention provides a tension balancer for overhead lines that can meet the demand for increased stroke length within a set load range by reducing the hysteresis loss of the deflection-load characteristic. It is intended to be provided.

The present invention includes a plurality of coaxially arranged tubular members including at least an outer first tubular member and an inner second tubular member arranged coaxially with a gap in the radial direction, and a first. In the overhead wire tension balancer provided with a coil spring that applies an elastic force to the axial movement of the second tubular member with respect to the first tubular member and a spring washer that supports the coil spring, the first and second cylinder members. A contact blocking means for preventing contact between the spring washer and the first tubular member and / or the second tubular member is provided between the tubular members, and the contact blocking means is the spring washer and / or the first and second cylinder members. The frictional resistance with respect to the tubular member of the spring washer is smaller than the frictional resistance with respect to the first and second tubular members of the spring washer.

In the overhead wire tension balancer of the present invention, a contact blocking means for preventing contact between the spring washer and the first tubular member and / or the second tubular member between the first and second tubular members. The contact blocking means has a deflection-load characteristic because its frictional resistance to the spring washer and / or the first and second tubular members is smaller than the frictional resistance of the spring washer to the first and second tubular members. Hysteresis loss is reduced and the stroke length can be increased within the set load range. Twice

Specifically, the contact blocking means is at least three wire rods or at least one strip arranged so as to be spaced apart from each other in the axial direction and the inner circumference of the first and second tubular members. It can be configured and a spring washer can be placed inside the wire. In such an overhead wire tension balancer, the spring washer comes into contact with the wire or strip, and the frictional resistance is significantly smaller than when the spring washer comes into contact with the first tubular member or the second tubular member. Therefore, the above-mentioned effect of the present invention can be obtained. In addition, when a strip is used, one of them exerts the above-mentioned action by using a wide one.

In the present invention, if the wire rod or the strip is surface-treated to reduce the friction coefficient, the hysteresis loss of the deflection-load characteristic of the tension balancer for overhead wires can be further reduced. As the surface treatment, DLC coating, hard chrome plating, TiN coating, polytetrafluoroethylene coating and the like can be adopted. Further, when the spring washer is surface-treated to reduce the friction coefficient at least on the outer periphery thereof, the frictional resistance to the wire rod or the strip is reduced, and the hysteresis loss of the deflection-load characteristic of the tension balancer for overhead wire is further reduced. be able to.

Further, in the present invention, the contact blocking member can be an auxiliary washer having a diameter larger than that of the spring washer and having a surface treatment that lowers the friction coefficient at least on the outer periphery. Even in such a configuration, the same effect as described above can be obtained. Moreover, it is more effective to use such a configuration in combination with the above configuration.

In the present invention, a plurality of coil springs can be provided in the axial direction. In this case, an auxiliary washer can be interposed between the coil springs.

According to the present invention, there is provided a tension balancer for overhead lines that can increase the stroke length within a set load range and cope with an increase in the amount of expansion and contraction of the overhead line.

It is a side sectional view of the tension balancer for an overhead line of an embodiment. FIG. 2 is a sectional view taken along line II-II of FIG. It is an enlarged view of the part indicated by the arrow III of FIG.

(composition)
Hereinafter, an example of the basic structure of the tension balancer for overhead lines to which the present invention is applied will be described. FIG. 1 shows a tension balancer 100 for overhead lines, and FIG. 2 shows a cross-sectional structure thereof. The tension balancer 100 for overhead lines includes an outer tubular member (first tubular member) 101, a first intermediate tubular member (second tubular member) 102, and a second intermediate tubular member, which are four coaxially arranged tubular members. It includes a member 103 and an inner cylinder member 104.

The compressed outer coil spring 105 is housed in the gap between the outer cylinder member 101 and the first intermediate cylinder member 102. The left end of the outer coil spring 105 is in contact with the outer auxiliary washer (contact blocking member) 102b that is in contact with the outer spring washer 102a welded to the outer circumference of the first intermediate cylinder member 102. The outer auxiliary washer 102b has an outer diameter larger than the outer diameter of the outer spring washer 102a, and at least the outer peripheral surface thereof is surface-treated to reduce the friction coefficient. Examples of the surface treatment for lowering the coefficient of friction include DLC coating, hard chrome plating, TiN coating, and polytetrafluoroethylene coating.

Further, at the right end of the outer coil spring 105, the outer spring washer 102a is welded to the inner surface of the outer tubular member 101, and the outer auxiliary washer 102b is in contact with the outer spring washer 102a.

A plurality of (three in this embodiment) outer wire rods (contact blocking members) 201 are arranged at equal intervals in the circumferential direction on the inner peripheral surface of the outer tubular member 101. The outer wire rod 201 is made of a steel wire having a high hardness such as a piano wire or a copper wire having good slidability, and is fixed to the inner circumference of the outer tubular member 101 by welding or adhesion, for example. Further, the outer peripheral surface of the outer wire rod 201 is surface-treated to reduce the friction coefficient. Examples of the surface treatment for lowering the coefficient of friction include DLC coating, hard chrome plating, TiN coating, and polytetrafluoroethylene coating. Further, a strip or a plurality of outer wire rods 201 may be arranged on the outer peripheral surface of the first intermediate cylinder member 102.

An intermediate coil spring 106 in a compressed state is housed in the gap between the first intermediate cylinder member 102 and the second intermediate cylinder member 103. In the state shown in FIG. 1, the left end of the intermediate coil spring 106 is in contact with the intermediate auxiliary washer (contact blocking member) 103b that is in contact with the intermediate spring washer 103a welded to the outer periphery of the second intermediate cylinder member 103. The intermediate auxiliary washer 103b has an outer diameter larger than the outer diameter of the intermediate spring washer 103a, and at least the outer peripheral surface thereof is subjected to the same surface treatment as described above for lowering the friction coefficient.

Further, at the right end of the intermediate coil spring 106, an intermediate spring washer 103a is welded to the inner peripheral surface of the first intermediate cylinder member 102, and an intermediate auxiliary washer (contact blocking member) 103b is in contact with the intermediate spring washer 103a. ..

A plurality of (three in this embodiment) intermediate wire rods (contact blocking members) 202 are arranged at equal intervals in the circumferential direction on the inner peripheral surface of the first intermediate cylinder member 102. The intermediate wire 202 is made of a steel wire having a high hardness such as a piano wire or a copper wire having good slidability, and is fixed to the inner circumference of the first intermediate cylinder member 102 by welding or adhesion, for example. There is. Further, the outer peripheral surface of the intermediate wire rod 202 is subjected to the same surface treatment as described above to reduce the friction coefficient. Further, a strip or a plurality of intermediate wire rods 202 may be arranged on the outer peripheral surface of the second intermediate cylinder member 103.

The compressed inner coil spring 107 is housed in the gap between the second intermediate cylinder member 103 and the inner cylinder member 104. In the state shown in FIG. 1, the left end of the inner coil spring 107 is in contact with the inner auxiliary washer (contact blocking member) 104b that is in contact with the inner spring washer 104a welded to the outer circumference of the inner cylinder member 104. The inner auxiliary washer 104b has an outer diameter larger than the outer diameter of the inner spring washer 104a, and at least the outer peripheral surface thereof is subjected to the same surface treatment as described above to reduce the friction coefficient.

Further, at the right end of the inner coil spring 107, the inner spring washer 104a is welded to the inner peripheral surface of the second intermediate cylinder member 103, and the inner auxiliary washer (contact blocking member) 104b is in contact with the inner spring washer 104a. ..

A plurality of (three in this embodiment) inner wire rods (contact blocking members) 203 are arranged at equal intervals in the circumferential direction on the inner peripheral surface of the second intermediate cylinder member 103. The inner wire 203 is made of a steel wire having a high hardness such as a piano wire or a copper wire having good slidability, and is fixed to the inner circumference of the second intermediate cylinder member 103 by welding or adhesion, for example. There is. Further, the outer peripheral surface of the inner wire rod 203 is subjected to the same surface treatment as described above to reduce the friction coefficient. Further, a strip or a plurality of inner wire rods 203 may be arranged on the outer peripheral surface of the inner cylinder member 104.

The portions where the outer coil spring 105, the intermediate coil spring 106, and the inner coil spring 107 come into contact with the tubular member are coated or filled with grease, which is a lubricant, so as not to hinder the relative slippage between the two. .. The lubricant is not limited to grease as long as it has a lubricating function.

An overhead wire mounting member 108 is fixed to the right end surface of the inner cylinder member 104 in FIG. 1. The overhead line mounting member 108 includes a bolt 108a, and an overhead line (not shown) is attached to the overhead line mounting member 108 by using the bolt 108a. Examples of the overhead line include overhead lines for railways, but may be overhead lines for electric power for other purposes, overhead lines for signal transmission, overhead lines for support, and the like.

Further, the tension balancer 100 for overhead lines is supported by the support column (not shown) by the support column side mounting member 109. That is, the lid 111 is fixed to the left end opening of the outer cylinder member 101, and the opening is closed by the lid 111, so that the first intermediate cylinder member 102, the second intermediate cylinder member 103, and the inner cylinder member 104. Is prevented from coming out of the outer cylinder member 101. The support column side mounting member 109 is fixed to the lid body 111 by welding, and the lid body 111 is pulled out from the outer tubular member 101 by a U-shaped rod 110 inserted from above in the drawing into the mounting hole formed in the outer tubular member 101. It is firmly supported so that it does not come out. A bolt 109a is attached to the support column side mounting member 109, and the overhead wire tension balancer 100 is attached to the support column by the bolt 109a. Reference numeral 112 in the drawing is a reinforcing member welded to the outer tubular member 101.

(Function of tension balancer for overhead line)
An overhead line is attached to the overhead line attachment member 108 of the overhead line tension balancer 100 shown in FIG. In this state, the weight of the overhead line and the force for pulling the overhead line to the right of the figure pull the overhead line attachment member 108 relatively to the right of the figure.

On the other hand, since the outer coil spring 105, the intermediate coil spring 106, and the inner coil spring 107 are in the compressed state, the inner cylinder member 104, the second intermediate cylinder member 103, and the first intermediate cylinder member 102 are respectively in the right direction in the drawing. In order to pull it out, a force that overcomes the elastic force of the outer coil spring 105, the intermediate coil spring 106, and the inner coil spring 107 is required. The reaction force of this force becomes the tension acting on the overhead wire attached to the overhead wire mounting member 108, that is, the tension that pulls the overhead wire in the left direction in the drawing. In this way, tension acts to pull the overhead line (not shown) stretched toward the right in FIG. 1 toward the left in the figure. For example, when the overhead wire is expanded or contracted or moved up and down, the overhead wire attachment member 108 moves to the left or right in the figure, which is absorbed by the expansion and contraction of the outer coil spring 105, the intermediate coil spring 106, and the inner coil spring 107.

When the overhead line mounting member 108 moves to the left and right in the figure, the inner cylinder member 104, the second intermediate cylinder member 103, and the first intermediate cylinder member 102 move to the left and right in the figure. At that time, the inner cylinder member 104, the second intermediate cylinder member 103, and the first intermediate cylinder member 102 are not fixed to each other and are supported by a coil spring, so that the inner cylinder member 104, the second intermediate cylinder member 103, and the first intermediate cylinder member 102 are slightly tilted due to their own weight or the like. , Swings in the direction orthogonal to the axial direction. Conventionally, there has been a problem that the hysteresis loss of the deflection-load characteristic is large because the spring washer comes into contact with the inner peripheral surface of the tubular member at that time.

In the overhead wire tension balancer 100 having the above configuration, when the inner cylinder member 104, the second intermediate cylinder member 103, and the first intermediate cylinder member 102 swing in the direction orthogonal to the axial direction, the inner auxiliary washer 104b is the inner wire rod. It comes into contact with 203, the intermediate auxiliary washer 103b contacts the intermediate wire 202, and the outer auxiliary washer 102b contacts the outer wire 201. In this case, since the frictional resistance at the contact is smaller than the frictional resistance at the time when the spring washers 102a, ... And the stroke length can be increased within the set load range.

In particular, in the above embodiment, since the outer auxiliary washers 102b, ... Are provided in addition to the outer wire rods 201, ... Hysteresis loss is significantly reduced.

(Change example)
The present invention is not limited to the above embodiment, and various modifications can be made.
For example, in the above embodiment, the outer auxiliary washers 102b, ... Are provided in addition to the outer wire rods 201, ..., But the same action and effect can be obtained by providing only one of them. Here, if the outer wire rods 201, ... Are not provided, the outer auxiliary washers 102b, ... Will come into contact with the outer tubular members 101, .... In this case, the outer tubular members 101, ... Can be subjected to a surface treatment such as molten aluminum plating to reduce the friction coefficient. Further, a plurality of outer coil springs 105, ... Can be provided in the axial direction, and outer auxiliary washers 102b, ... Can be arranged between the outer coil springs 105, .... Further, as the contact blocking means, it is possible to simply apply a surface treatment to reduce the friction coefficient on the inner peripheral surface of the outer spring washer 102a and / or the outer tubular member 101 without providing the outer wire rod 201 or the outer auxiliary washer 102b. Such a surface treatment is also a contact blocking means of the present invention.

The outer wire rods 201, ... Are not limited to the configuration in which three are arranged in the circumferential direction, and the number is arbitrary as long as there are three or more such as four or five. Further, the outer wire rods 201, ... Are not limited to the configuration in which they are arranged at equal intervals in the circumferential direction, and may be densely arranged in a place where a large load acts (for example, the lower side).

The outer wire rod 201, ... is composed of rods, but it can also be composed of strips. When a strip is used, a wide one can be provided at a place (for example, the lower side) where a large load acts, so that one of them can exert the above-mentioned action. Further, the strip may be curved according to the cylindrical shape of the inner peripheral surface of the outer tubular member 101. Further, the outer auxiliary washers 102b, ... Are not limited to those made of metal, and may be made of hard plastic such as polyimide resin.

The present invention can be used as a tension balancer for overhead power lines.

100 ... Tension balancer for overhead wire, 101 ... Outer tubular member (first tubular member), 102 ... First intermediate tubular member (second tubular member), 102a ... Outer spring washer, 102b ... Outer auxiliary washer (contact prevention) (Member), 103 ... Second intermediate washer, 103a ... Intermediate spring washer, 103b ... Intermediate auxiliary washer (contact blocking member), 104 ... Inner cylinder member, 104a ... Inner spring washer, 104b ... Inner auxiliary washer (contact blocking member) , 105 ... outer coil spring, 106 ... intermediate coil spring, 107 ... inner coil spring, 108 ... overhead wire mounting member, 108a ... bolt, strut side mounting member ... 109, bolt ... 109a, 201 ... outer wire rod (contact blocking member) , 202 ... Intermediate wire (contact blocking member), 203 ... Inner wire (contact blocking member), 110 ... U-shaped bar, 111 ... Lid, 112 ... Reinforcing member.

Claims

A plurality of coaxially arranged tubular members including at least an outer first tubular member and an inner second tubular member arranged coaxially with a gap in the radial direction.
A coil spring that gives an elastic force to the axial movement of the second tubular member with respect to the first tubular member, and
In an overhead wire tension balancer provided with a spring washer that supports the coil spring,
A contact blocking means for preventing contact between the spring washer and the first tubular member and / or the second tubular member is provided between the first and second tubular members, and the contact blocking means is provided. A tension balancer for overhead lines, wherein the frictional resistance of the spring washer and / or the first and second tubular members is smaller than the frictional resistance of the spring washer with respect to the first and second tubular members.
The contact blocking means is at least three wires or at least one strip arranged apart from each other along the axial direction and the inner circumference of the first and second tubular members, and the wire rod or plate. The tension balancer for overhead lines according to claim 1, wherein the spring washer is arranged inside the strip.
The tension balancer for overhead wires according to claim 2, wherein the wire rod or strip is surface-treated to reduce the coefficient of friction.
The tension balancer for overhead lines according to claim 2, wherein the spring washer is surface-treated to reduce the friction coefficient at least on the outer periphery thereof.
The contact blocking member is an auxiliary washer which is arranged between the spring washer and the coil spring and has a diameter larger than that of the spring washer and is surface-treated to reduce the friction coefficient at least on the outer periphery thereof. The tension balancer for overhead wires according to any one of Items 1 to 4.
The tension balancer for overhead lines according to claim 5, wherein the auxiliary washers are provided at both ends of the coil spring.
The tension balancer for overhead wires according to claim 5 or 6, wherein a plurality of the coil springs are provided in the axial direction, and the auxiliary washer is interposed between the coil springs.