Contact wire voltage detector and grounding device

Abstract

To provide a detector grounding device that avoids an electrical shock accident by easily and surely detecting a separation line of a trolley wire without using expensive sensors and promoting a quick countermeasure.SOLUTION: A detector grounding device 1 is provided with: a grounding contactor 10 electrically connected between a trolley wire T and a rail R to open / close therebetween for grounding the trolley wire T on the rail R; and an electroscope 11 for detecting a voltage to ground of the trolley wire T, wherein the grounding contactor 10 is closed when the voltage is not applied to the trolley wire T by the electroscope 11 to enable grounding operation for railroad track construction to be performed. A separation line detector 9 is provided that includes: a pair of contact plates 4 disposed at intervals in an extension direction of the trolley wire T and in contact with the trolley wire T; and a resistance measurement device 19 for measuring electric resistance which is varied accompanying a contact failure or separation of the contact plates 4.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a voltage detecting and grounding device for detecting the voltage of a contact wire prior to electric train line construction work and grounding a non-voltage contact wire while prompting appropriate measures without grounding a live contact wire. [Background technology]

[0002] Generally, a voltage-detecting earthing device is equipped with a detector having a resistor between the contact wire and the ground wire for detecting the contact wire's voltage to ground, and a grounding switch in parallel with the detector for opening and closing the grounding wire to ground the contact wire. When the detector detects the no-voltage state of the contact wire, the grounding switch can be operated and the contact wire can be grounded, so that construction work on the railway line can be safely carried out. On the other hand, when the detector detects the live line state, the grounding switch cannot be operated and the contact wire cannot be grounded, so countermeasures for construction work are taken. Conventionally, as described in Patent Document 1, a voltage detection grounding device is mounted on a work vehicle that can travel on rails using iron wheels, together with a working device whose height can be adjusted by an actuator. The voltage detection grounding device includes a conductive contact member that can contact the trolley wire, a grounding circuit that electrically connects the contact member and the iron wheel, a contact determination circuit that determines whether the contact member is in contact with the trolley wire, and an actuator operation restriction means that restricts the operation of the actuator unless the contact determination circuit determines that the contact member is in contact with the trolley wire. The contact determination circuit includes a sensor that detects the load when the contact member is in contact with the trolley wire and the protruding length of the cylinder of the lifting mechanism. In the voltage detection grounding device configured in this way, if the contact determination circuit does not determine that the contact member is in contact with the trolley wire, the actuator operation restriction means restricts the operation of the actuator in the direction that moves the working device closer to the trolley wire. Therefore, a static elimination operation must be performed by bringing the contact member into contact with the trolley wire prior to the actual construction work, which prevents electric shock accidents for workers. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3966652 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional voltage detection and grounding device, a sensor for detecting the lift load and lift position is required in the contact determination circuit, which makes the structure of the device complicated and increases the manufacturing cost. Therefore, a means for easy detection with a simple structure is desired. Therefore, an object of the present invention is to provide a voltage detecting grounding device that can reliably detect contact wire breakage without using expensive sensors and prevent electric shock accidents by prompting rapid response measures. [Means for solving the problem]

[0005] In order to solve the above problems, in this invention, a voltage detection and grounding device 1 is composed of a grounding contactor 10 electrically connected between a trolley wire T and a rail R and opening and closing the gap between them to ground the trolley wire T to the rail R, a voltage detector 11 detecting the voltage to ground of the trolley wire T, and a control panel 6 controlling the grounding contactor 10 so that the voltage detector 11 enables the grounding operation of the grounding contactor 10 for railway track construction when the trolley wire T is at or below a predetermined voltage, but disables the grounding operation of the grounding contactor 10 when the voltage is at or above the predetermined voltage. The device is equipped with a pair of contact plates 4 arranged at intervals in the extension direction of the trolley wire T and electrically connecting the grounding contactor 10 and the voltage detector 11 to the trolley wire T by contacting the trolley wire T from below, and a wire separation detection unit 9 electrically opening and closing the gap between the contact plates 4 and the trolley wire T in response to contact and separation between the contact plates 4 and the trolley wire T. Effect of the Invention

[0006] The present invention can reliably detect the loss of a contact wire with a simple structure without using expensive sensors, etc., and can prevent electric shock accidents by encouraging rapid response measures. [Brief description of the drawings]

[0007] [Figure 1] It is a perspective view of the voltage detector and grounding device according to the present invention. [Diagram 2] It is a front view of the voltage detector and grounding device of FIG. 1. [Diagram 3] It is a left side view of the voltage detector and grounding device of FIG. 1. [Figure 4] It is a right side view of the voltage detector and grounding device of FIG. 1. [Diagram 5] It is a rear view of the voltage detector and grounding device of FIG. 1. [Figure 6] It is a plan view of the voltage detector and grounding device of FIG. 1. [Figure 7] It is a schematic circuit diagram of the voltage detector and grounding device of FIG. 1. [Figure 8] It is a front view of the lifting device. [Figure 9] It is a side view of the lifting device of FIG. 8. [Figure 10] It is a plan view of the contact plate. [Figure 11] It is a side view of the contact plate. [Figure 12] It is a schematic circuit of the disconnection detection unit, where (A) shows the separated state between the contact plate and the trolley wire, and (B) shows the contact state. [Figure 13] It is a front view of the operation panel. [Figure 14] It is a side view of the operation panel.

Embodiment for Carrying Out the Invention

[0008] An embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 to 6, the voltage detector and grounding device 1 includes a hand-pushed cart 2 that can move along the railway line and is provided with wheels 2b that roll on the rail R of the railway line at the bottom of the frame 2a. In this frame 2a, a main body 3 of the voltage detector and grounding device 1, a lifting device 5 that supports a pair of contact plates 4 arranged at intervals in the front-rear direction along the extension of the trolley wire T, a control panel 6, and a generator 7 are incorporated.

[0009] The main body 3 is fixed to the lower frame within the frame body 2a, and as shown in Figure 7, is equipped with a voltage detection grounding section 8 equipped with a grounding contactor 10 and a voltage detector 11, a loss detection section 9 equipped with a loss detection contactor 12, and an unclamping detection section 13.

[0010] One contact of the grounding contactor 10 is connected to one contact plate 4 through a grounding high-voltage cable 14, and the other contact is connected to a rail clamp 16 through a grounding low-voltage cable 15. The rail clamp 16 is attached to and electrically connected to the rail R, and when the grounding contactor 10 is turned ON, it grounds the trolley wire T to the rail R. The grounding high-voltage cable 14 moves in and out of a cable cover 17 provided on the side of the main body 3 in response to the extension and retraction of the telescopic arm 30 of the push-up device 5, preventing interference with other parts.

[0011] The voltage detector 11 includes large and small resistors 11a and 11b connected in series to divide the voltage to detect the voltage, and a voltmeter 11c that detects the voltage to ground of the trolley wire T by measuring the small voltage of the small resistor 11a. The voltage detector 11 is connected in parallel with the grounding contactor 10 between the high-voltage grounding cable 14 and the low-voltage grounding cable 15. When the voltage detector 11 detects a no-voltage state of the trolley wire T, it is controlled by the control panel 6 to turn on the grounding contactor 10.

[0012] The line loss detection unit 9 includes a line loss detection contactor 12 having one contact connected to one of the contact plates 4 through a grounding high-voltage cable 14 and the other contact connected to the other of the contact plates 4 through a line loss detection cable 18, and a resistance measuring device 19 in the control panel 6. The line loss detection contactor 12 detects the resistance value measured by the resistance measuring device 19 in the ON state, thereby detecting that either of the pair of contact plates 4, 4 is separated from or in poor contact with the trolley wire T. The line loss detection cable 18 moves in and out of the cable cover 17 together with the grounding high-voltage cable 14 in response to the extension and retraction of the extension arm 30 of the push-up device 5, thereby preventing interference with other parts.

[0013] The clamp detachment detection unit 13 is connected to the rail clamp 16 via a low-voltage grounding cable 15 and to the earth holder 21 via a clamp detachment detection cable 20, and is equipped with a resistance meter 22 in the control panel 6 that detects the resistance between the rail clamp 16 and the earth holder 21.

[0014] 8 and 9, the push-up device 5 supporting the contact plate 4 so that it can be raised and lowered includes a motor 24 fixed to a storage cover 23 fixed to the upper part of the frame body 2a of the dolly 2, a drive pulley 26 to which rotation is transmitted by the motor 24 via a belt 25, a reducer 27 connected to the rotation shaft of the drive pulley 26 to convert the rotation into an orthogonal direction, a ball screw unit 29 connected to the output shaft of the reducer 27 via a chain coupling 28, and a telescopic arm 30 that extends and retracts up and down as a movable nut 29b screwed into a ball screw 29a of the ball screw unit 29 moves in the screw axial direction. The telescopic arm 30 has a link structure of a so-called magic hand in which one of a pair of intersecting arm pieces 30a, 30b at the lower end is connected to the movable nut 29b and extends and retracts by approaching and moving away from the other one fixed to the lower end frame 31a. The telescopic arm 30 has a pair of intersecting arm pieces 30a, 30b, one of which is fixed to an upper end frame 31b and the other of which is pivotally supported by the upper end frame 31b so as to be movable toward and away from the other.

[0015] A pair of contact plates 4 arranged at an interval in the forward and backward directions of travel of the carriage 2 are fixed horizontally via insulators 34 on a mounting plate 33 supported for vertical movement by a linear bushing 32 fixed on the upper end frame 31b of the push-up device 5. The mounting plate 33 is equipped with a load cell 35 that is connected to the inside of the control panel 6 through a lead wire 36 and detects the pressing load of the contact plate 4. The contact plate 4 is supported by the push-up device 5 and pushed up, so that it is pressed against the trolley wire T from below with a predetermined pressure.

[0016] 13 and 14, the control panel 6 accommodates a wiring board 39 for a sequence circuit, a terminal board 40, a digital panel meter 41, etc. inside a housing 37 equipped with inner and outer main doors 38. The surface of the main door 38 is provided with first and second lamp groups 42, 43 for displaying status in two upper and lower rows, and below that, a switch group 44 covered by an operation door 45 that can be opened and closed.

[0017] In this voltage detection grounding device 1, it is moved on the rail R to a predetermined position, and the rail clamp 16 and the earth holder 21 are attached to the rail R. When the power switch in the switch group 44 is turned on and the push-up button switch is pressed, the push-up device 5 raises the contact plate 4. When the contact plate 4 contacts the trolley wire T and the load cell 35 detects a specified contact load, the push-up device 5 stops the contact plate 4. When the contact plate 4 contacts the trolley wire T, the voltage detector 11 of the voltage detection grounding unit 8 detects the voltage of the trolley wire T, and when no voltage is applied, when the button switch for grounding is pressed, the grounding contactor 10 is turned on, the trolley wire T and the rail R are conductive, and the trolley wire T is grounded. This ensures safety and allows the start of construction work. On the other hand, when voltage is applied to the trolley wire T, the corresponding lamp lights up to call attention and prompt the user to take appropriate measures. When the contactor 12 for detecting loss of contact is turned on while the trolley wire T is in the grounded state, if the upward force of the contact plates 4, 4 against the trolley wire T decreases and insufficient contact or separation with the trolley wire T occurs as shown in Figures 12(A) and 12(B), the resistance meter 19 in the loss of contact detection unit 9 measures the resistance to detect this abnormality and turn on the corresponding lamp in the first lamp group 42. In response to this, by pressing the corresponding switch for pushing up or pulling down in the switch group 44, the upward force against the trolley wire T is adjusted and the contact plate 4 is restored to an appropriate contact state with the trolley wire T. In addition, if the trolley wire T is in a grounded state and the rail clamp 16 comes off the rail R, causing insufficient attachment to the rail R or falling off, the resistance meter 22 in the clamp detachment detection unit 13 detects this abnormality by measuring the resistance, and lights up the corresponding lamp in the first lamp group 42 to warn the user. After the work is completed, turn off the contactor 12 for detecting disconnection and press the corresponding button switch for removing the grounding device to turn off the grounding contactor 10, and then press the corresponding button switch for pressing down the contact plate 4, which will be lowered by the push-up device 5. Finally, turn off the switch for the operating power supply, close the operating door 45, remove the rail clamp 16 and earth holder 21 from the rail R, and remove the device. [Explanation of symbols]

[0018] 1 Voltage detection grounding device 2 Carts 2a Frame 2b wheels 3. Main unit 4 Contact plate 5 Push-up device 6 Control Panel 7. Generator 8 Voltage detection grounding section 9. Disconnection detection unit 10 Ground contactor 11 Voltage detector 11a small resistor 11b large resistor 11c Voltmeter 12 Contactor for detecting disconnection 13 Clamp release detector 14 High voltage grounding cable 15 Low voltage earth cable 16 Rail clamp 17 Cable cover 18 Cable for detecting disconnection 19 Resistance measuring device 20 Clamp release detection cable 21 Earth Holder 22 Resistance measuring device 23 Storage cover 24 Motor 25 Belt 26 Drive pulley 27 Reducer 28 Chain Coupling 29 Ball screw unit 29a Ball screw 29b Movable nut 30 Telescopic Arm 30a Arm piece 30b Arm piece 31a Bottom frame 31b Top frame 32 Linear bushing 33 Mounting plate 34 Insulator 35 Load Cell 36 Lead Wire 37 Case 38 Main Door 39 Distribution board 40 Terminal board 41 Digital panel meter 42 First Lamp Group 43 Second Lamp Group 44 Switches 45 Operation Door R rail T contact wire

Claims

[Claim 1] A voltage-detecting and grounding device comprising: a grounding contactor electrically connected between a trolley wire and a rail of a railway track and opening and closing the contact between the contactor wire and the rail to ground the trolley wire to the rail; a voltage detector for detecting a voltage to ground of the trolley wire; and a control device for controlling the contactor so as to enable a grounding operation of the grounding contactor for railway track construction when the voltage detector detects that no voltage is applied to the trolley wire, and to disable the grounding operation of the grounding contactor when the voltage detector detects that a voltage is applied to the contact wire. a pair of contact plates arranged at intervals in the extending direction of the contact wire and contacting the contact wire from below to electrically connect the grounding contactor and the voltage detector to the contact wire; A contact wire grounding device comprising: a contact detection unit having a resistance measuring device that detects the electrical resistance between the contact plate and the contact wire when the contact plate comes into contact with or separates from the contact wire.

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