JP6901330B2 - Vibration absorber for overhead wire - Google Patents

Description

The present invention relates to a vibration absorbing device that suppresses the vibration of a trolley wire by absorbing the vibration of a suspension wire or an auxiliary suspension wire erected above a railway track.

The trolley wire is pushed up by the current collector when the train passes and vibrates together with the suspension wire that suspends it. The vibration propagates in the traveling direction of the current collector, is reflected by the gripping point by the trolley wire hanger and the supporting point by the movable bracket of the suspension wire, and propagates in the backward direction. In particular, the reflected vibration causes a disconnection of the current collector that follows.
In order to suppress the vibration of this trolley wire, the suspension wire is hung on a support via a spring (Patent Document 1), or with a damper that combines a damper and a spring that damps the vibration by the frictional resistance between the cylinder and the piston. The trolley wire is hung on the suspension wire with a hanger (Patent Document 2), or the suspension wire is supported via a support device that combines a damper and a spring that damps vibration by the flow resistance of oil between the cylinder chambers partitioned by the piston. It is hung on an object (Patent Document 3).

Jikken Sho 35-1061 Gazette Japanese Unexamined Patent Publication No. 6-171402 Japanese Unexamined Patent Publication No. 2001-270348

According to the elastic hanging bracket described in Patent Document 1 and the overhead wire support device described in Patent Document 3, the vibration of the overhead wire is absorbed, but in addition to the vibration absorption, the spring also changes the load applied to the overhead wire due to wind pressure or the like. As a result, the contact surface of the pantograph and the position of the trolley wire fluctuate, which adversely affects the current collection. In the hanger with a damper described in Patent Document 2, since the effect of vibration damping is generated by friction, high processing accuracy of the apparatus and frequent maintenance and inspection are required to maintain a constant frictional force. Further, since the displacement of the suspension wire and the trolley wire is used, the effective installation position is limited to the place where the displacement between the two is small. Further, if the difference in elongation due to the temperature change between the iron suspension wire and the copper trolley wire cannot be followed, the device may be tilted and the vibration absorbing function may not be fully exhibited.
The present invention solves the above-mentioned conventional problems and is on an existing suspension line or an auxiliary suspension line that may be erected between the suspension line and the trolley wire (hereinafter, both are collectively referred to as "suspension line"). It can be easily retrofitted, does not support the suspension wire itself, has a large degree of freedom in selecting the mounting position, and can effectively absorb the vibration of the suspension wire and trolley wire without being affected by expansion and contraction due to temperature changes, and has a simple structure. It is an object of the present invention to provide a flexible vibration absorber.

The vibration absorber 1 of the present invention for solving the above problems has a support frame 3 attached between the spans of the suspension wires M that support the trolley wire T, and the support frame 3 in the vertical direction via a spring 4. A conductive inertial body 5 that is supported so as to be relatively movable, and a plurality of magnets 9 that are arranged and fixed on the support frame 3 so as to form a magnetic flux that crosses by the relative movement of the inertial body 5 are provided. A resistance due to a magnetic force is applied to the relative movement of the inertial body 5 accompanying the vibration of M to suppress the vibration.

The vibration absorber of the present invention does not support the suspension wire itself, can be retrofitted on the existing suspension wire, and absorbs the vertical vibration of the trolley wire due to the push-up of the pantograph without being affected by expansion and contraction due to temperature changes. Therefore, the speed of the train and the current collecting performance can be improved. The mounting position on the suspension wire M can be freely selected except for the supporting position of the hanging wire M and the mounting position of a hanger or the like. Since it does not use a friction mechanism, it does not require maintenance for wear and can withstand long-term use.

It is a front view of the installation state of the vibration absorption device of the suspension wire which concerns on this invention. It is a vertical sectional view of the vibration absorber which concerns on this invention. It is a cross-sectional view of the vibration absorber of FIG.

Embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, the suspension wire M is supported by a movable bracket B or the like projecting from a support column or the like on the side of the track with a predetermined span. The suspension wire M supports the trolley wire T via a large number of hangers H at predetermined intervals. The vibration absorber 1 of the illustrated embodiment is attached to the central portion between the support diameters of the suspension wire M, but is not limited thereto.

As shown in FIG. 2, the vibration absorber 1 includes a mounting member 2 for mounting on the suspension wire M, a support frame 3 pivotally supported by the mounting member 2 with a pivot pin 8, and a spring on the support frame 3. It includes a conductive inertial body 5 suspended by 4.

The mounting member 2 includes a tubular portion 2a that holds around the suspension wire M, and a pivot portion 2b that extends downward from the tubular portion 2a. The tubular portion 2a is rotatable around the axis of the suspension wire M. The fixing clamps 6 are fixed on the suspension wire M located on both sides of the mounting member 2 in the wire drawing direction at intervals from the mounting member 2. The fixed clamp 6 limits the movement of the mounting member 2 in the wire drawing direction to a predetermined range.

The support frame 3 includes a vertically long cylindrical case 7 in which both upper and lower ends are closed. The ear portion 7a protrudes from the upper end of the case 7. The ear portion 7a is pivotally supported by the pivot portion 2b of the mounting member 2 by a pivot pin 8 in the direction orthogonal to the extension line. Therefore, the case 7 is always suspended from the suspension line M with the axis line oriented in the vertical direction. Inside the case 7, a conductive inertial body 5 is suspended so as to be relatively movable in the vertical direction via a spring 4. The spring 4 is selected to have a spring constant that does not resonate with the vibration of the overhead wire. The inertial body 5 has a columnar shape and is always arranged at the center of the case 7 in the vertical direction. Further, in the case 7, the north and south poles are alternately arranged along the vertical movement direction of the inertial body 5, and the north and south poles are arranged so as to sandwich the inertial body 5 in the radial direction so that the north and south poles face each other. A plurality of magnets 9 are arranged in a row.
As shown in FIG. 3, the case 7 includes a plurality of guide ridges 7b extending from the inner circumference thereof toward the axial center and extending in the axial direction. The guide ridge 7b projects higher than the magnet 9 toward the axial center of the case 7 so that the radial distance from the magnet 9 is kept constant when the inertial body 5 moves up and down.

The trolley wire T is pushed up by the pantograph when the train passes, and descends after passing, so that the suspension wire M vibrates together with the trolley wire T. At this time, since the inertial body 5 of the vibration absorbing device 1 tries to maintain a stationary state by inertia, it relatively moves in the vertical direction along the guide ridge 7a while expanding and contracting the spring 4 in the case 7. When the inertial body 5 and the case 7 move relative to each other, the inertial body 5 crosses the magnetic flux between the magnets 9 and 9 facing each other, so that a vortex current is excited. In addition, eddy current loss occurs, vibration energy is consumed, and vibration of the suspension wire M is reduced.

In general, the spring constant of the overhead wire for a train line is the smallest in the central part of the span and large in the vicinity of the support point. The vibration caused by pushing up the pantograph causes an amplitude difference between the central part of the span and the vicinity of the support point. By attaching the vibration absorber 1 to the central portion of the span in the present embodiment, the spring constant of the span can be improved to a constant value, which is particularly effective in reducing vibration, but the installation position thereof depends on the situation. It can be selected as appropriate.

1 Vibration absorber 2 Mounting member 2a Cylinder 2b Pivot 3 Support frame 4 Spring 5 Inertia 6 Fixed clamp 7 Case 7a Ear 7b Guide ridge 8 Pit 9 Magnet B Movable bracket H Hanger M Suspension wire T Trolley wire

Claims (4)

A support frame that is rotatably attached around the suspension line, separated from the trolley wire, between the spans of the suspension line that supports the trolley wire.
A conductive inertial body supported on the support frame so as to be relatively movable in the vertical direction via a spring.
A plurality of magnets fixed to the support frame so as to form a magnetic flux across the inertial body due to the relative movement of the inertial body.
It is provided with fixed clamps fixed on both sides of the suspension wire of the support frame in the extending direction.
A vibration absorbing device for a suspension wire, which suppresses the vibration by imparting resistance due to the magnetic force of the magnet to the relative movement of the inertial body accompanying the vibration of the suspension wire. The claim is characterized in that the support frame is swingable with respect to the suspension wire along a plane parallel to the extending direction of the suspension wire, and is swingable around the axis of the suspension wire. The vibration absorber for the overhead wire according to 1. The support frame includes a case supported by the overhead wire so that the long axis always faces the vertical direction.
The vibration absorbing device for a suspension wire according to claim 1, wherein the spring, the inertial body, and the magnet are provided in the case. The vibration absorbing device for a suspension wire according to claim 3, wherein the case includes a guide member that guides the movement of the inertial body by maintaining a certain distance between the inertial body and the magnet.

Images