JP2018203096A - Vibration absorption device for trolley wire - Google Patents

Abstract

To provide a vibration absorption device which can be easily attached with less restriction of an installation position on a trolley wire, can be used for a long term, and can efficiently absorb vibration of the contact wire.SOLUTION: A vibration absorption device 1 is configured so that tip parts of a pair of plate springs 3 having flexibility in a vertical direction are made to come face to face each other with a mutual interval intervening along a trolley wire M, and base end parts of the plate springs are fixed to the trolley wire M through an installation metal fitting 2. An inertia body 5 comprises a support plate 14 comprising a pair of long holes 14a which are inclined downward from both ends in an extension wire direction from an intermediate part corresponding to the tip parts of the plate springs 3 and the plate springs 3 comprise a pivot 13 which is inserted into the long hole 14a and can change a support position of the inertia body 5 according to elastic deformation of the plate spring. A viscoelastic plate 4 is bonded at a deformation position of the plate spring 3, and a suppression plate 15 is bonded on the viscoelastic plate. When the trolley wire M vibrates together with the contact wire, the inertia body 5 maintains a quiescent state by inertia, bending parts 10 of the plate springs 3 are elastically deformed, and resistance by the viscoelastic plate 4 is applied to return to an original shape for absorbing vibration.SELECTED DRAWING: Figure 2

Description

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

The trolley wire is pushed up by the current collector when passing through the train and vibrates together with the suspension wire that hangs the trolley wire. The vibration propagates in the traveling direction of the current collector, and is reflected at the gripping point of the trolley wire hanger or the support point of the movable bracket of the suspension wire and propagates in the backward direction. In particular, the reflected vibration causes disconnection of the current collector that follows the back.
In order to suppress the vibration of the trolley wire, a suspension wire is hung on a support through a spring (Patent Document 1), or a damper with a damper that combines a damper and a spring that attenuates vibration by frictional resistance between a cylinder and a piston. A trolley wire is hung on a suspension wire with Hangaiya (Patent Document 2), and a suspension wire is supported through a support device that combines a damper and a spring that damps vibrations due to oil flow resistance between cylinder chambers defined by pistons. Hanging on an object (Patent Document 3) is performed.

Japanese Utility Model Publication No. 35-1061 JP-A-6-171402 Japanese Patent Laid-Open No. 2001-270348

According to the elastic suspension metal fitting described in Patent Document 1 and the overhead wire support device described in Patent Document 3, vibration of the overhead wire is absorbed, but in addition to vibration absorption, the spring is also subjected to changes in 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 change, which adversely affects current collection. In the hanger with a damper described in Patent Document 2, since the effect of vibration damping is generated by friction, high machining accuracy and frequent maintenance and inspection of the apparatus are necessary to maintain a constant frictional force. Moreover, since the displacement of the suspension wire and the trolley wire is used, an effective installation position is limited to a place where there is little displacement between the two. Furthermore, if the elongation difference caused by the temperature change between the iron suspension wire and the copper trolley wire cannot be followed, the apparatus may be inclined and the function of absorbing vibration may not be sufficiently exhibited.
The present invention solves the above-described conventional problems, and is on an existing suspension line or an auxiliary suspension line (hereinafter, both are collectively referred to as a “suspension line”) that may be constructed between the suspension line and the trolley line. Simple structure that can easily be retrofitted, does not support the suspension line itself, has a large degree of freedom in selecting the mounting position, and can effectively absorb the vibration of the suspension line and trolley line without being affected by expansion and contraction due to temperature changes An object of the present invention is to provide a simple vibration absorber.

  In order to solve the above-described problem, the vibration absorbing device 1 of the present invention has a base end portion attached with the plate surface facing up and down between the diameters of the suspension wire M that supports the trolley wire T, and a distal end portion that is the suspension wire M. Are supported by a pair of leaf springs 3 arranged at intervals in the extending direction of the wire and the opposite end portions of the leaf springs 3 so as to be movable relative to each other in the extending direction and the up and down direction. An inertial body 5 that elastically deforms the leaf spring 3 that is relatively displaced by inertial mass, and a viscoelastic plate 4 that is fixed at a deformation position of the leaf spring 3 and provides resistance to the deformation of the leaf spring are provided.

  The vibration absorbing device of the present invention does not support the suspension line itself, can be retrofitted onto the existing suspension line, and absorbs vibration in the vertical direction of the trolley line due to the pantograph being pushed up without being affected by expansion and contraction due to temperature changes. Thus, the train speed and current collecting performance can be improved. The attachment position on the suspension line M can be freely selected except for the support position and the attachment position of the hanger. Because it does not use a friction mechanism, it does not require maintenance for wear and withstands long-term use.

It is a front view of the installation state of the vibration absorber of the hanging wire which concerns on this invention. 1 is a front view of a vibration absorber according to the present invention. FIG. 3 is a side view of the vibration absorbing device of FIG. 2.

Embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, the suspension line M is supported with a predetermined span by a movable bracket B or the like that protrudes from a post on the side of the track onto the track. The suspension line M supports the trolley line T via a number of hangers H at a predetermined interval. The vibration absorbing device 1 of the illustrated embodiment is attached to the central portion between the support diameters of the suspension wire M, but is not limited to this.

  As shown in FIG. 2, the vibration absorber 1 includes a pair of mounting brackets 2 for mounting on the suspension line M, a pair of leaf springs 3 connected to the mounting brackets 2, and these leaf springs 3. A viscoelastic plate 4 fixed to the plate and an inertial body 5 supported by the two leaf springs 3.

  The mounting bracket 2 is composed of a plate material having a substantially U-shaped cross section, and a lateral mounting portion 6 that abuts the lower portion of the outer peripheral surface along the suspension line M, and a continuous connection that faces the mounting portion 6 with a gap therebetween. It consists of a part 7 and two U-bolts 8 that fasten the attachment part 6 to the suspension line M. The two mounting brackets 2 are mounted at positions facing each other with an interval in the extending direction.

  The leaf spring 3 is formed of a flat and long plate material, and includes a base end side fixing portion 9 that overlaps the connection portion 7 of the mounting bracket 2, a free end side bending portion 10 that continues to the fixing portion 9, and a connection portion 7. A bolt 11 that joins the fixing portion 9, a pair of brackets 12 that project downward from the distal end portion of the bending portion 10, and that face each other in a direction orthogonal to the extending line, and a pivot 13 that horizontally extends between the brackets 12, 12 are provided. The bending part 10 has flexibility in the direction perpendicular to the plate surface. The two leaf springs 3 are fixed at positions facing each other with their tips abutted in the extending direction.

  The viscoelastic plate 4 has a long plate shape and is bonded to an elastically deformed portion of the upper surface of the bending portion 10 of the leaf spring 3 to impart resistance to the elastic deformation and suppress its behavior. For example, acrylic resin is used for the viscoelastic plate 4. On the viscoelastic plate 4, a suppression plate 15 is attached to increase the strain of the viscoelastic plate 4 by restricting the deformation of the viscoelastic plate 4 against the elastic deformation of the leaf spring 3. The restraining plate 15 is integrally fixed to the connecting portion 7 of the mounting bracket 2 with the bolt 11 through the spacer 16 together with the fixing portion 9 of the leaf spring 3.

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

  When the train passes, the trolley line T is pushed up by the pantograph and descends after passing, whereby the suspension line M vibrates together with the trolley line. At this time, the inertial body 5 of the vibration absorbing device 1 tries to maintain a stationary state due to inertia, so that the bending portion 10 of the leaf spring 3 is moved while the pivot shaft 13 which is a support position of the inertial body 5 is moved in the long hole 14a. Is elastically curved and deformed. The viscoelastic plate 4 between the leaf spring 3 and the restraining plate 15 provides resistance against the return of the leaf spring 3 to the original shape when returning from the strain accompanying 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 absorbing device 1 does not support the suspension line M, and the leaf spring 3 is deformed in the vertical direction by the bending portion 10, so that the lateral displacement due to the load change applied to the trolley line or the suspension line due to wind pressure or the like. It does not act on it and follows its displacement.

  In general, the spring constant of the overhead wire with respect to the train line is the smallest at the center portion of the span and the vicinity of the support point is large, 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 absorbing device 1 can improve the spring constant between the spans to a constant value by being provided at the center of the span, and is particularly effective in reducing the vibration. Can be selected as appropriate.

DESCRIPTION OF SYMBOLS 1 Vibration absorber 2 Mounting bracket 3 Leaf spring 4 Viscoelastic plate 5 Inertial body 6 Mounting part 7 Connection part 8 U-bolt 9 Fixing part 10 Bending part 11 Bolt 12 Bracket 13 Axis 14 Support plate 14a Long hole 15 Suppression board B Movable Bracket H Hanger M Suspension wire T Trolley wire

Claims (3)

A pair of leaf springs in which the base end portions are respectively attached with the plate surface facing up and down between the diameters of the suspension wires supporting the trolley wires, and the tip portions are arranged at intervals in the extending direction of the suspension wires;
An inertial body that is supported at the tip portions of the opposing leaf springs so as to be relatively movable in the extending direction and the up-down direction, and elastically deforms the leaf spring that is relatively displaced by the inertial mass with respect to the vibration of the suspension line;
A suspension line vibration absorbing device comprising: a viscoelastic plate fixed to a deformation position of the leaf spring and imparting resistance to the deformation of the leaf spring. The tip of the leaf spring includes a pivot that pivotally supports the inertial body,
2. The inertial body includes a pulling handle that has a long hole that is inclined downwardly toward the proximal end portion from the distal end portion of the leaf spring and into which the pivot shaft is inserted. Absorber for vibration suspension.   The suspension line vibration absorbing device according to claim 1 or 2, wherein a restraining plate for restricting elastic deformation of the leaf spring is fixed to the viscoelastic plate.

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