JP6886847B2 - Overhead line tension change reduction device - Google Patents

Description

The present invention relates to an overhead line tension change reducing device that reduces a tension change generated in the overhead line when tension is applied to the overhead line by a spring balancer.

The slack tension is affected by expansion and contraction due to temperature changes, elastic elongation due to creep and wear of the trolley wire, and inclination of the support due to aging, etc. It is necessary to keep the tension of the train line constant. A spring type tension balancer is known as a device for that purpose. A conventional spring-loaded tension balancer has a tubular casing connected to a strut, an inner member coaxially received in the casing and allowed to appear and fall in the axial direction, and connected to an overhead wire, and the inside thereof. It has a coil spring coaxially interposed between the casing and the inner member so as to elastically urge the member in the immersion direction (see, for example, Patent Document 1). Such a conventional spring type tension balancer is installed in a state where each coil spring is compressed and deformed to some extent under standard installation conditions. Therefore, in the conventional spring type tension balancer, for example, when the temperature drops and the train line contracts, the inner member protrudes from the outer casing against the repulsive force of the coil spring, and when the temperature rises and the train line extends, the coil Since the inner member is immersed in the casing due to the elastic restoration force of the spring, it is possible to absorb the displacement due to the expansion and contraction of the train line.

Japanese Unexamined Patent Publication No. 2000-158981

The conventional spring type tension balancer can handle the tension change rate of the train line within the range of ± 9% of the standard tension. In recent years, there has been an increasing need for speed improvement, and as the traveling speed increases, the influence of changes in the tension of the train line on the contact performance of the current collecting system has become a problem. Therefore, a tension balancer for overhead lines is required, which can further reduce the tension change rate and make the tension change rate less than 5% of the standard tension.

An object of the present invention is to provide a tension change reducing device for an overhead line, which can reduce the tension change generated in the overhead line by a simple structure.

The present invention solves the above problems by means of solutions as described below.
Although the description will be given with reference numerals corresponding to the embodiments of the present invention, the present invention is not limited to this embodiment.
According to the invention of claim 1, as shown in FIGS. 1 to 5, when the tension (T) of the overhead wire (1) is held constant by the spring balancer (4), the tension change generated in the overhead wire is changed. _A weight change reducing device for reducing tension of an overhead wire, in which an additional tension (TA) is applied to the overhead wire in response to expansion and contraction of the overhead wire in order to reduce the tension change generated in the overhead wire. The weight portion includes a portion (16), and when the tension of the overhead wire _{falls below a predetermined value (T min} ), the additional tension is applied to the overhead wire, and the tension of the overhead wire becomes a predetermined value (T). _{When the value is min} ) or more, the overhead wire tension change reducing device (14) is characterized in that the additional tension is not applied to the overhead wire.

According to the second aspect of the present invention, in the overhead line tension change reducing device according to claim 1, as shown in FIGS. 2, 4 and 5, the additional tension is applied from the weight portion to the overhead line. It is an overhead wire tension change reducing device including a switching unit (17) for switching between a state and a non-acting state.

A third aspect of the present invention, the change in tension reduction apparatus of the overhead wire according to claim 2, wherein the switching unit is configured to move the weight portion to the inclined guide (17b), in a state of exerting said additional tension This is an overhead wire tension change reducing device, characterized in that the weight portion is switched and the weight portion is moved to the horizontal guide (17a) to switch to a state in which the additional tension is not applied.

According to a fourth aspect of the present invention, in the overhead wire tension change reducing device according to any one of claims 1 to 3 , as shown in FIG. 1, the weight portion includes the spring balancer and the above. It is a tension change reducing device for an overhead wire, characterized in that the additional tension is applied from the outside of the spring balancer between the overhead wire and the overhead wire.

According to the present invention, the change in tension generated in the overhead line can be reduced by a simple structure.

It is a perspective view of the tension change reduction apparatus of the overhead line which concerns on embodiment of this invention. It is a side view of the tension change reduction apparatus of an overhead line which concerns on embodiment of this invention. It is sectional drawing of the spring balancer which uses the tension change reduction apparatus of the overhead line which concerns on embodiment of this invention. It is a vertical cross-sectional view for demonstrating the operation when the overhead wire of the overhead wire tension change reduction apparatus which concerns on embodiment of this invention extends, and (A) shows the standard tension acting on the overhead wire by a spring balancer. It is a vertical cross-sectional view which shows the state, and (B) is a vertical cross-sectional view which shows the state when the overhead wire is extended and the tension is lowered. It is a vertical cross-sectional view for demonstrating the operation when the overhead wire of the overhead wire tension change reduction apparatus which concerns on embodiment of this invention contracts, and (A) is the state when the overhead wire is extended and the tension is lowered. (B) is a vertical cross-sectional view showing a state in which a standard tension is applied to an overhead wire by a spring balancer. It is a graph which shows the tension characteristic figure of the tension change reduction apparatus of the overhead line which concerns on embodiment of this invention as an example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The overhead wire 1 shown in FIGS. 1 and 2 is an overhead train line (train track) erected over the track. The overhead wire 1 is supported at the support points by the support structure at a predetermined interval so that the distance (interval) between the support points becomes a predetermined length. The overhead line 1 is erected over a railroad track on which an electric vehicle (railroad vehicle) such as a train or an electric locomotive runs. The overhead wire 1 includes a trolley wire to which the sliding plate of the current collector of the electric vehicle contacts, an auxiliary overhead wire for supporting the trolley wire, and a trolley wire for supporting the trolley wire via the auxiliary overhead wire. .. The insulator 2 is a member that insulates and supports an electric conductor. The insulator 2 electrically insulates between the overhead wire 1 and the spring balancer 4, and also electrically insulates between the overhead wire 1 and the tension change reducing device 14. The utility pole 3 is a member that supports the components of the train track. The utility pole 3 supports the spring balancer 4, and the foundation portion is fixed along the track on which the electric vehicle travels.

The spring balancer 4 shown in FIGS. 1 to 5 is a device that keeps the tension T of the overhead wire 1 constant. The spring balancer 4 includes tubular portions 5 to 8 shown in FIG. 3, springs 9 to 11, mounting portions 12 and 13 shown in FIGS. 1 and 2, and the like. The spring balancer 4 absorbs the expansion and contraction of the overhead wire 1 such as the temperature expansion and contraction of the overhead wire 1, creep elongation, elastic elongation due to wear, etc. by using the spring force (elastic force) of the springs 9 to 11, and the spring balancer 4 absorbs the expansion and contraction of the overhead wire 1 It is a spring type tension balancer that keeps the tension T constant. The spring balancer 4 shown in FIGS. 1 to 5 is an automatic tension adjusting device that automatically adjusts the tension T of the overhead wire 1 in order to always keep the slack and the tension change due to the temperature change of the overhead wire 1 constant. Function.

The tubular portions 5 to 8 shown in FIG. 3 are members that move forward and backward in conjunction with the expansion and contraction operation of the overhead wire 1. The tubular portion 5 is inserted into the spring 9 in a state of being connected to the overhead wire 1 side, and the outer peripheral surface of the tubular portion 5 is provided with a spring receiving portion 5a or the like that receives one end of the spring 9. The tubular portion 6 is inserted into the spring 10 in a state where the tubular portion 5 is accommodated so as to be able to advance and retreat in the center line direction, and the spring receiving portion 6a that receives one end of the spring 10 and the spring that receives one end of the spring 9. It is provided with a receiving portion 6b and the like. The tubular portion 7 is inserted into the spring 11 in a state where the tubular portion 6 is retractably accommodated in the center line direction, and includes a spring receiving portion 7a for receiving the spring 11, a spring receiving portion 7b for receiving the spring 10, and the like. ing. The tubular portion 8 accommodates the tubular portion 7 so as to be able to move forward and backward in the direction of the center line, and includes a spring receiving portion 8a for receiving one end of the spring 11.

The springs 9 to 11 are members that apply tension T to the overhead wire 1. The springs 9 to 11 are compression coil springs that are constantly used in a compressed state, and a spring force is constantly applied to the overhead wire 1. The springs 9 to 11 are set so that the spring constant gradually decreases from the small diameter spring 9 to the large diameter spring 11. The spring 9 generates a spring force by being sandwiched between the spring receiving portion 5a on the tubular portion 5 side and the spring receiving portion 6b on the tubular portion 6 side. The spring 10 generates a spring force by being sandwiched between the spring receiving portion 6a on the tubular portion 6 side and the spring receiving portion 7b on the tubular portion 7 side. The spring 11 generates a spring force by being sandwiched between the spring receiving portion 7a on the tubular portion 7 side and the spring receiving portion 8a on the tubular portion 8 side.

The mounting portions 12 and 13 shown in FIGS. 1 and 2 are members that detachably mount the tubular portion 8 on the utility pole 3. The mounting portion 12 includes a fixing band that is detachably attached to the utility pole 3 so as to connect the rear end portion of the tubular portion 8 and the outer peripheral portion of the utility pole 3. The mounting portion 13 includes a connecting shaft that connects the bottom portion of the cylinder portion 8 near the tip end and the outer peripheral portion of the utility pole 3, and a fixing band that detachably attaches both ends of the connecting shaft to the utility pole 3 and the utility pole 8. I have.

The tension change reducing device 14 shown in FIGS. 1 to 5 reduces the tension change generated in the overhead wire 1 when the tension T is applied to the overhead wire 1 by the spring balancer 4. Here, the variation in tension, in the case of setting the tension T of the overhead line 1 to the standard tension T _S by a spring balancer 4 is acceptable variation range when the tension T is varied by expansion and contraction of the overhead line 1. Tension change reduction device 14, as shown in FIG. 6, when the expansion and contraction of the overhead line 1 is the tension T of the overhead line 1 is changed, by the action of additional tension T _A to the overhead wire 1 as shown in FIG. 4, The tension T of the overhead wire 1 is set within a predetermined range.

Here, the vertical axis shown in FIG. 6 is the tension T (kgf) of the overhead wire 1, and the horizontal axis is the displacement (mm) of the overhead wire 1. The standard tension T _s is a standard tension value of the overhead wire 1 set by the spring balancer 4. The upper limit tension T _max is an upper limit value of the tension T allowed when the tension T of the overhead wire 1 increases. The lower limit tension T _min is the lower limit value of the tension T allowed when the tension T of the overhead wire 1 decreases. In the tension characteristic diagram shown in FIG. 6, the standard tension T _S is 5500 kgf, the upper limit tension T _max is 5775 kgf ( _{+ 5% of the standard tension T S} ), and the lower limit tension T _min is 5225 kgf (-of the standard tension T _S ). 5%), and is a characteristic diagram when the standard length is ± 320 mm. The thick solid line (Example) shown in FIG. 6 is the tension characteristic when the tension change rate by the tension change reducing device 14 according to this embodiment is in the range of + 9% to -5%. The fine solid line (conventional example) is the tension characteristic when the tension change rate by the conventional spring type tension balancer is within the range of ± 9%. The alternate long and short dash line _{indicates the value of the standard tension T S} , and the thick dotted line indicates the value of the upper limit tension T _max and the lower limit tension T _min .

Tension changes reducing device shown in FIGS. 1 to 5 14, the tension T of the overhead wire 1 exerts an additional tension T _A to the overhead wire 1 so as not to fall below the lower limit tension T _min. Tension change reduction device 14, for example, as shown in FIG. 6, when the tension rate of change of the overhead wire 1 by conventional spring balancer is within the range of ± 9% of the standard tension T _S, the tension change of the overhead line 1 rate reducing to within normal tension T range of _{+ 9% ~-5% S} . The tension change reduction device 14 is detachably attached to the outside of the spring balancer 4 without modifying the structures of the overhead wire 1 and the spring balancer 4. As shown in FIGS. 1 to 5, the tension change reducing device 14 includes a connecting portion 15, a weight portion 16, a switching portion 17, an additional tension transmitting portion 18, a mounting portion 19, and the like.

The connecting portion 15 shown in FIGS. 1 to 5 is a means for connecting the insulator 2 and the spring balancer 4. The connecting portion 15 is detachably pin-coupled to the tip end portion of the tubular portion 5 of the spring balancer 4 and the hook 2. Connection 15 is added tension T _A is transmitted from Jutsumu unit 16 when the tension T of the overhead wire 1 is below the lower limit tension T _min, the additional direction (direction pulling the overhead wire 1) pushing the cylindrical portion 5 the action of tension T _a.

Weight portion 16, in order to reduce the tension variation occurring in the overhead line 1, a means which applies an additional tension T _A to the overhead line 1 in response to expansion and contraction of the overhead line 1. The weight portion 16 is, for example, a metal wheel, and rolls along the horizontal guide 17a and the tilt guide 17b while being guided by the horizontal guide 17a and the tilt guide 17b of the switching portion 17. Weight portion 16, as shown in FIGS. 1 and 2, between the spring balancer 4 and the overhead line 1, the action of additional tension T _A from the outside of the spring balancer 4. Weight portion 16, as shown in FIGS. 4 to 6, when the tension T of the overhead wire 1 is below the lower limit tension T _min is allowed to act additional tension T _A in this overhead line 1, lower tension the tension T of the overhead line 1 is when it is T _min or more, it does not act the additional tension T _a to the overhead wire 1.

Switching unit shown in FIGS. 1 to 5 17 is a means for switching to a state not to act in a state exerting an additional tension T _A from the weight portion 16 to the overhead wire 1. Switching unit 17 is disposed above the spring balancer 4 while supporting the weight portion 16, into a state not to act in a state in which the action of the additional tension T _A switch outside of the spring balancer 4. As shown in FIGS. 2, 4 and 5, the switching unit 17 includes a horizontal guide 17a, an inclined guide 17b, a support member 17c, and the like. The switching portion 17 functions as a guide rail that moves the weight portion 16 forward and backward while rotating and contacting the horizontal guide 17a and the inclined guide 17b. Switching unit 17, as shown in FIG. 4 (B) and FIG. 5 (A), the move the weight portion 16 in the inclined guide 17b, switches to state the action of the additional tension T _A. On the other hand, the switching unit 17, as shown in FIG. 4 (A) and FIG. 5 (B), the move the weight portion 16 in the horizontal guide 17a, is switched to a state which does not act the additional tension T _A. The switching portion 17 is, for example, the horizontal guide 17a and the tilt guide 17b so that the tension T of the overhead wire 1 becomes the lower limit tension T _min when the weight portion 16 is located at the boundary between the horizontal guide 17a and the tilt guide 17b. It is a structure that can adjust the positional relationship with. The switching portion 17 is a non-movable fixed portion regardless of the expansion and contraction of the overhead wire 1, and is fixed at a predetermined position.

Horizontal guide 17a shown in FIG. 2, 4 and 5 are members the weight portion 16 moves when the weight portion 16 does not act the additional tension T _A to the overhead wire 1. The horizontal guide 17a is a flat surface parallel to the center line of the spring balancer 4, and is heavy when _{the tension T of the overhead wire 1 is equal to or greater than the lower limit tension T min as shown in FIGS. 4 (A) and 5 (B).} The weight portion 16 moves. 2, the inclined guide 17b shown in FIGS. 4 and 5 are members which the weight portion 16 moves when the weight portion 16 exerts the additional tension T _A to the overhead wire 1. The inclination guide 17b is a downwardly inclined surface that intersects the center line of the spring balancer 4 and inclines downward, and as shown in FIGS. 4 (B) and 5 (A), the tension T of the overhead wire 1 is the lower limit tension T _min. The weight portion 16 moves when it falls below. As shown in FIGS. 2, 4 and 5, the inclined guide 17b has an upper end portion of the inclined guide 17b connected to one end of the horizontal guide 17a so as to be continuous with the horizontal guide 17a. Inclined guide 17b, for example, the magnitude of the additional tension T _A to be applied to the overhead wire 1 so as to be changed to any size, the inclination angle of the inclined guide 17b a structure that can be set to any angle. The support member 17c is a member that supports the horizontal guide 17a and the inclined guide 17b. The support member 17c functions as a base for supporting the horizontal guide 17a and the inclined guide 17b with the weight portion 16 mounted on the horizontal guide 17a and the inclined guide 17b.

Adding tension transmission unit shown in FIGS. 18 is a means for transmitting the additional tension T _A from the weight portion 16 to the overhead wire 1. The additional tension transmitting portion 18 is arranged above the spring balancer 4, and connects the weight portion 16 and the connecting portion 15. The additional tension transmitting portion 18 is a movable portion that moves together with the weight portion 16 according to the expansion and contraction of the overhead wire 1. As shown in FIGS. 4 (B) and 5 (A), the additional tension transmitting portion 18 acts on the weight portion 16 when the weight portion 16 is located on the inclined guide 17b of the switching portion 17. to transfer to the connecting portion 15 a tensile force in the horizontal direction force component as an additional tension T _a. As shown in FIGS. 1 to 5, the additional tension transmission unit 18 includes a connecting member 18a, a slider 18b, a guide member 18c, and the like.

The connecting member 18a is a member that connects the weight portion 16 and the slider 18b. One end of the connecting member 18a is connected to the rotation shaft of the weight portion 16, and the other end is detachably attached to the side surface of the slider 18b. The connecting member 18a rotatably supports the weight portion 16 and functions as a pulley together with the weight portion 16. The slider 18b is a member that moves up and down along the guide member 18c. The slider 18b moves up and down according to the expansion and contraction of the overhead wire 1 to apply a tensile force to the guide member 18c. The guide member 18c is a member that movably guides the slider 18b. The guide member 18c is arranged so that the center line of the guide member 18c is orthogonal to the center line of the spring balancer 4, and the lower end portion of the guide member 18c is detachably attached to the upper surface of the connecting portion 15. ..

The mounting portion 19 is a means for detachably mounting the switching portion 17 on the spring balancer 4. The mounting portion 19 includes a fixing band or the like that is detachably attached to the cylinder portion 8 so as to connect the support member 17c of the switching portion 17 and the cylinder portion 8 of the spring balancer 4.

Next, the operation of the overhead wire tension change reduction device according to the embodiment of the present invention will be described.
For example, as shown in FIG. 4, when the temperature rises and the overhead wire 1 extends, the cylinder portion 5 retracts due to the spring force of the spring 9, and the tension T of the overhead wire 1 decreases. When the overhead wire 1 extends and the tubular portion 5 retracts, the connecting portion 15 retracts integrally with the tubular portion 5 and the guide member 18c also retracts integrally with the connecting portion 15. When the guide member 18c retracts, the connecting member 18a also retracts, and as shown in FIG. 4A, the weight portion 16 on the horizontal guide 17a rolls along the horizontal guide 17a. When the upper horizontal guide 17a is Jutsumu unit 16 is moving, because the force from the weight portion 16 to the connecting member 18a is not applied, it does not act additional tension T _A to the connecting part 15, the spring 5 of the spring balancer 4 Tension T acts on the overhead wire 1 only by the spring force of.

As shown in FIG. 4B, when the weight portion 16 rolls downward from the horizontal guide 17a along the inclined guide 17b, a tensile force is applied from the weight portion 16 to the connecting member 18a. Since this tensile force acts on the guide member 18c through the connecting member 18a and the slider 18b, this tensile force acts on the connecting portion 15. When the weight portion 16 is moving along the tilt guide 17b, the slider 18b descends along the guide member 18c. Therefore, since the constant tensile force continuously from the weight portion 16 to the connecting member 18a is applied, certain additional tension T _A to the coupling portion 15 is applied. The spring 9 of the spring balancer 4 is stretched by this tensile force, and the tubular portion 5 of the spring balancer 4 receives the tensile force and retracts. Thus, tension in the catenary 1 through the connection portion 15 and the insulator 2 acts as an additional tension T _A, increasing the tension T of the overhead line 1 is the tension T of the overhead line 1 is suppressed from being lowered.

On the other hand, for example, as shown in FIG. 5, when the air temperature drops from the state shown in FIG. 4 and the overhead wire 1 contracts, the tubular portion 5 advances against the spring force of the spring 9, and the tension T of the overhead wire 1 Will increase. When the overhead wire 1 contracts and the tubular portion 5 advances, the connecting portion 15 advances integrally with the tubular portion 5, and the guide member 18c also advances integrally with the connecting portion 15. When the guide member 18c advances, the connecting member 18a also advances, and as shown in FIG. 5B, the weight portion 16 rolls from the inclined guide 17b along the horizontal guide 17a. When the weight portion 16 is moving on the horizontal guide 17a, no force is applied from the weight portion 16 to the connecting member 18a. Therefore, no action is added tension T _A to the connecting portion 15, the tension T is applied to the overhead wire 1 only by the spring force of the spring 5 of the spring balancer 4. As a result, acts added tension T _A is the overhead wire 1, is inhibited from tension T of the overhead line 1 is increased.

The overhead wire tension change reducing device according to the embodiment of the present invention has the following effects.
(1) In this embodiment, in order to reduce the tension variation occurring in the overhead line 1, the Jutsumu 16 additional tension T _A to the overhead wire 1 is allowed to act in accordance with the expansion and contraction of the overhead line 1. Therefore, it is possible to exert additional tension T _A in accordance with a variation in the tension T of the overhead wire 1. As a result, the change in tension generated in the overhead wire 1 can be reduced by a simple structure.

(2) In this embodiment, between the spring balancer 4 and the overhead line 1, the weight portion 16 exerts the additional tension T _A from the outside of the spring balancer 4. Therefore, the weight portion 16 can be easily retrofitted to the outside of the spring balancer 4 without modifying the structure of the spring balancer 4 or the overhead wire 1. As a result, it is not necessary to move or replace the existing spring balancer 4 and the overhead wire 1, and the weight portion 16 can be added inexpensively in a short time.

(3) In this embodiment, when the tension T of the overhead wire 1 is below the lower limit tension T _min is the additional tension T _A to the overhead line 1 is allowed to act is Jutsumu unit 16, the tension T of the overhead line 1 is less than the lower tension T _min when it is Jutsumu portion 16 to the overhead line 1 is not applied the additional tension T _a. Therefore, before the tension T of the overhead wire 1 reaches the lower tension T _min, allowed to act additional tension T _A in this overhead line 1, it is possible to reliably reduce the tension change occurring in the overhead wire 1. For example, as shown in FIG. 6, to reduce the range of the range of ± 9% of + 9% to -5% of the standard tension T _S tension rate of change of the overhead wire 1 as compared to the conventional spring type tension balancer be able to.

(4) In this embodiment, the switching unit 17 in the state not to act in a state exerting an additional tension T _A from the weight portion 16 to the overhead wire 1 is switched. Therefore, for applying an additional tension T _A to the overhead wire 1 when the overhead wire 1 contracts, the tension T of the overhead line 1 can be prevented from being lowered. Also, since the overhead line 1 is not applied the additional tension T _A to the overhead wire 1 when the elongated, it is possible to prevent the tension T of the overhead line 1 is increased.

(5) In this embodiment, by moving the weight portion 16 in the inclined guide 17b, switching the switching unit 17 in a state of exerting the additional tension T _A, to move the weight portion 16 in the horizontal guide 17a, additional switching unit 17 switches to a state not to act the tension T _a. Therefore, for example, by adding the weight portion 16 and the switching portion 17 having a simple structure to the existing spring balancer 4, the spring force of the spring balancer 4 is supported and the tension change rate of the overhead wire 1 is in the range of ± 9%. It can be reduced within the range of + 9% to -5%.

The present invention is not limited to the embodiments described above, and various modifications or modifications can be made as described below, and these are also within the scope of the present invention.
(1) In this embodiment, an overhead train line such as an overhead wire 1 has been described as an example of an overhead wire, but the present invention can also be applied to an electric line erected on a support such as an electric wire. .. Further, in this embodiment, the case where the tension change reducing device 14 is applied to the spring balancer 4 has been described as an example, but the present invention can also be applied to a flow stop device that prevents displacement of the overhead wire 1. .. Further, in this embodiment, the case where the spring balancer 4 includes the tubular portions 5 to 8 having a nested structure of four is described as an example, but the spring balancer including a plurality of tubular portions other than the four is also described. The invention can be applied. Further, in this embodiment, the case where the switching portion 17 is mounted on the spring balancer 4 by the mounting portion 19 has been described as an example, but the switching portion 17 can also be detachably mounted on the utility pole 3.

(2) In this embodiment, the case where one weight unit 16, the switching unit 17, and the additional tension transmitting unit 18 are arranged has been described as an example, but a plurality of these may be arranged. For example, it is also possible to act uniformly additional tension T _A from both sides of the weight portion 16, and arranged a switching unit 17 and the additional tension transmission unit 18 on both sides of the spring balancer 4 connection 15. Further, in this embodiment, when the overhead wire 1 is reduced the tension T of the overhead line 1 extends, taking a case exerting a tensile force by the weight portion 16 in the overhead wire 1 as an additional tension T _A Examples As described above, the present invention is not limited to the case where a tensile force is applied to the overhead wire 1. For example, when the overhead wire 1 is the tension T of the overhead line 1 is contracted to increase, by weight portion 16 can also exert a pressing force as the additional tension T _A to the overhead wire 1. For example, inclined guides 17b that incline downward can be arranged at both ends of the horizontal guide 17a. In this case, when the weight portion 16 is located at the boundary between one of the inclined guides 17b and the horizontal guide 17a, the tension T of the overhead wire 1 becomes the lower limit tension T _min , and the other inclined guide 17b and the horizontal guide 17a The positional relationship between the horizontal guide 17a and the inclined guide 17b can be set so that the tension T of the overhead wire 1 becomes the upper limit tension T _{max when the weight portion 16 is located at the boundary between the two.} Further, in this embodiment, the case where the tension change rate is reduced within the range of + 9% to _{-5% of the standard tension T S} has been described as an example, but the tension change rate is +9 of the _{standard tension T S.} It is not limited to the range of% to -5%, but can be reduced within the range of any tension change rate.

1 Overhead line (overhead line)
2 Utility pole 4 Spring balancer 5-8 Cylinder part 9-11 Spring 12,13 Mounting part 14 Tension change reduction device 15 Connecting part 16 Weight part 17 Switching part 17a Horizontal guide 17b Tilt guide 17c Support member 18 Additional tension transmission part 18a Connection member 18b Slider 18c Guide member 19 Mounting part T Tension T _A Additional tension T _s Standard tension T _max Upper limit tension T _min Lower limit tension (predetermined value)

Claims (4)

It is an overhead line tension change reducing device that reduces the tension change generated in this overhead line when the tension of the overhead line is kept constant by a spring balancer.
In order to reduce the change in tension generated in the overhead line, a weight portion for applying additional tension to the overhead line according to the expansion and contraction of the overhead line is provided.
The weight portion is
When the tension of the overhead line falls below a predetermined value, the additional tension is applied to the overhead line.
When the tension of the overhead line is equal to or higher than a predetermined value, the additional tension should not be applied to the overhead line.
An overhead wire tension change reduction device characterized by. In the overhead wire tension change reducing device according to claim 1,
A switching portion for switching between a state in which the additional tension is applied and a state in which the additional tension is not applied to the overhead wire from the weight portion is provided.
An overhead wire tension change reduction device characterized by. In the overhead wire tension change reducing device according to claim 2.
The switching unit is
The weight portion is moved to the tilt guide to switch to a state in which the additional tension is applied.
Moving the weight portion to the horizontal guide to switch to a state in which the additional tension is not applied.
An overhead wire tension change reduction device characterized by. In the overhead wire tension change reducing device according to any one of claims 1 to 3.
The weight portion applies the additional tension from the outside of the spring balancer between the spring balancer and the overhead wire.
An overhead wire tension change reduction device characterized by.

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