JP6901325B2 - 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.

In order to solve the above problems, in the vibration absorber 1 of the present invention, the base end portions are attached to the spans of the suspension wire M supporting the trolley wire T with the plate surface facing up and down, and the tip portion is the suspension wire M. A pair of leaf springs 3 arranged at intervals in the wire drawing direction and the tips of both leaf springs 3 facing each other are supported so as to be relatively movable in the wire drawing direction and the vertical direction, respectively, with respect to the vibration of the suspension wire M. It includes an inertial body 5 that elastically deforms a leaf spring 3 that is relatively displaced by an inertial mass, and a viscoelastic plate 4 that is fixed at a deformed position of the leaf spring 3 and imparts resistance to the deformation of the leaf spring.

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 front view of the vibration absorber which concerns on this invention. It is a side 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 railroad 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 pair of mounting brackets 2 for mounting on the suspension wire M, a pair of leaf springs 3 connected to the mounting brackets 2, and these leaf springs 3. It includes a viscoelastic plate 4 fixed to and an inertial body 5 supported by both leaf springs 3.

The mounting bracket 2 is made of a plate material having a substantially U-shaped cross section, and is continuously connected to the lateral mounting portion 6 that abuts on the lower part of the outer peripheral surface along the suspension wire M so as to face the mounting portion 6 at a distance. It is composed of a portion 7 and two U-shaped bolts 8 for fastening the mounting portion 6 to the suspension wire M. The two mounting brackets 2 are mounted at positions facing each other at intervals in the wire drawing direction.

The leaf spring 3 is made of a flat long plate material, and has a fixing portion 9 on the base end side that overlaps the connecting portion 7 of the mounting bracket 2, a flexible portion 10 on the free end side that is continuous with the fixing portion 9, and a connecting portion 7. It includes a bolt 11 for joining the fixing portion 9, a pair of brackets 12 facing downward in the direction perpendicular to the extension line protruding downward from the tip end portion of the bending portion 10, and a pivot axis 13 horizontally extending between the brackets 12 and 12. The bent portion 10 has flexibility in the direction orthogonal to the plate surface. The two leaf springs 3 are fixed at positions facing each other with their tips abutting each other in the extending direction.

The viscoelastic plate 4 has a long plate shape and is adhered to an elastically deformed portion of the upper surface of the flexible portion 10 of the leaf spring 3 to impart resistance to the elastic deformation and suppress its behavior. For the viscoelastic plate 4, for example, an acrylic resin is used. On the viscoelastic plate 4, a suppressing plate 15 that increases the strain of the viscoelastic plate 4 by limiting the deformation of the viscoelastic plate 4 with respect to the elastic deformation of the leaf spring 3 is adhered. The restraining plate 15 is integrally fixed to the connecting portion 7 of the mounting bracket 2 together with the fixing portion 9 of the leaf spring 3 by the bolt 11 via the spacer 16.

The inertial body 5 is composed of a horizontally long rectangular parallelepiped having an inertial mass. A pair of elongated support plates 14 having a pair of elongated holes 14a for penetrating the pivots 13 of both leaf springs 3 are vertically fixed to the upper portion of the inertial body 5 so as to face each other. Both elongated holes 14a are linearly continuous diagonally downward from the intermediate portion in the longitudinal direction of the support plate 14 toward both ends, and the pivot 13 can move within that range, and the support position of the inertial body 5 can be changed. This allows elastic deformation of both leaf springs 3.

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. At this time, in order to maintain the stationary state by inertia, the inertial body 5 of the vibration absorber 1 moves the pivot 13 which is the support position of the inertial body 5 in the elongated hole 14a, and the flexible portion 10 of the leaf spring 3 is moved. Is elastically curved and deformed. The viscoelastic plate 4 between the leaf spring 3 and the restraining plate 15 imparts resistance to the return of the leaf spring 3 to its original shape when recovering from the strain caused by the elastic deformation of the leaf spring 3. As a result, the vibration absorbing device 1 absorbs the vibration of the suspension wire M and suppresses the vibration of the trolley wire T. The vibration absorber 1 does not support the suspension wire M, and the leaf spring 3 deforms the flexible portion 10 in the vertical direction. Therefore, the trolley wire or the suspension wire due to a wind pressure or the like is displaced in the lateral direction due to a load change applied to the suspension wire. It does not act on it and follows its displacement.

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

1 Vibration absorber 2 Mounting bracket 3 Leaf spring 4 Viscoelastic plate 5 Inertia body 6 Mounting part 7 Connection part 8 U-shaped bolt 9 Fixing part 10 Bending part 11 Bolt 12 Bracket 13 Pivot axis 14 Support plate 14a Long hole 15 Suppressing plate B Movable Bracket H Hanger M Suspension wire T Trolley wire

Claims (3)

A pair of plates in which the base ends are attached via mounting members with the plate surface facing up and down between the diameters of the suspension wires that support the trolley wire, and the tips are arranged at intervals in the extension direction of the suspension wire. With a spring
An inertial body that elastically deforms a leaf spring that is supported by the tips of both leaf springs facing each other so as to be relatively movable in the wire drawing direction and the vertical direction, and is displaced relative to the vibrational mass of the suspension wire.
A vibration absorbing device for a suspension wire, which comprises a viscoelastic plate fixed at a deformed position of the leaf spring and imparting resistance to the deformation of the leaf spring. The tip of the leaf spring is provided with a pivot shaft that pivotally supports the inertial body.
The first aspect of the present invention, wherein the inertial body is provided with a pull tab having an elongated hole into which the pivot is inserted, which is inclined downward from the tip end portion to the base end portion of the leaf spring. Vibration absorber for overhead wire. The vibration absorbing device for a suspension wire according to claim 1 or 2, wherein a suppressing plate that limits elastic deformation of the leaf spring is fixed to the viscoelastic plate.

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