JPH04272098A - Work bench lift device for track running vehicle - Google Patents

Abstract

PURPOSE:To automatically adjust the height of a work bench of a track running vehicle. CONSTITUTION:A relative position to a work object is detected by a sensor mounted to a work bench of a track running vehicle, and a lift hydraulic cylinder is actuated by a detection signal of the sensor to lift the work bench so that the relative position between the sensor and the work object obtains a predetermined value. In this way, no adjustment of height is required at each time by a worker released from fatigue by this adjusting operation. Since the height of the work bench is automatically adjusted to the preset relative position so as to facilitate the worm, an accident resulting in an injury or death and an accident of physical damage by improper adjustment are less generated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work platform elevating device for automatically adjusting the height of a work platform of a track vehicle in accordance with the position of an object to be worked on.

0002

2. Description of the Related Art Some track vehicles run on railway rails and are used to repair and inspect various structures (eg, overhead wires) installed in the sky. Such a track vehicle is equipped with a work platform that moves up and down, and a worker rides on the platform to work on workpieces located at high places. An operation panel for raising and lowering the workbench is provided on the workbench, and the height is manually adjusted by the worker according to the height of the work object.

[0003] As a conventional document regarding such a track running vehicle, there is, for example, Japanese Utility Model Application Publication No. 143508/1983.

0004

Problems to be Solved by the Invention (Problems) However, the above-mentioned conventional technology has the following problems. The first problem is that a large amount of effort is required to adjust the height of the workbench, which causes severe fatigue for the operator. The second problem is that the height adjustment is not always done accurately, and if it is not done, there is a risk of an accident.

(Explanation of Problem) First, the first problem will be explained. For example, when the object of work is an overhead wire, when a track vehicle moves on the rails to another location, the height of the overhead wire is not necessarily the same as at the previous location. Figure 4
, will be explained with reference to FIG.

FIG. 4 is a diagram illustrating the reason why the position of the overhead wire changes in the horizontal direction, and is a view looking down on the overhead wire and the rail from above. In FIG. 4, 20 is an overhead wire, 21
is a fulcrum, and 23 is a rail. Where the railway curves, the rail 23 also curves in an arc, but the overhead wire 2
0 has a polygonal shape because it is suspended with a straight line connecting the fulcrums 21 at fairly long intervals. Since the center of the workbench moves in an arc through the center between the rails 23 as shown by the dotted line, the overhead wire 20 moves as the track vehicle moves.
move closer or further away in the horizontal direction.

FIG. 5 is a diagram illustrating the reason why the position of the overhead wire changes in the vertical direction, and is a view of the overhead wire viewed from the side. The symbols correspond to those in FIG. 4, 22 is a hanging wire, and T is a slack. Since the distance between the fulcrums 21 is long, slack T inevitably occurs in the overhead wire 20 between them. Therefore, the height of the overhead wire 20 changes depending on the position of the track vehicle.

[0008] In response to such changes in the height of the work object,
Workers adjust the height of the workbench, but when doing this, they must stretch their backs, check the height, and operate the operation panel that raises and lowers the workbench.
Must be repeated many times. As a result, workers become increasingly fatigued.

Next, regarding the second problem, since the height of the workbench is manually adjusted by the worker as mentioned above, if the worker becomes fatigued towards the end of the work, Accurate adjustments may not be made. In such a case, there is a risk of personal injury or property damage.

The object of the present invention is to solve the above-mentioned problems.

[0011]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the work platform elevating device for a track running vehicle of the present invention includes a sensor mounted on the work platform to detect the relative position with respect to the work object;
A lifting hydraulic cylinder is provided to raise and lower the workbench so that the relative position becomes a predetermined value based on the detection signal of the sensor.

0012

[Operation] A sensor attached to the workbench of the track vehicle detects the relative position to the work object, and the detection signal activates the hydraulic cylinder for lifting and lowering, so that the relative position between the sensor and the work object is set to a predetermined value. Raise and lower the workbench so that This eliminates the need for the worker to adjust the height every time, and relieves the worker from fatigue caused by such operations. Further, since the height of the workbench is automatically adjusted to a preset relative position to facilitate work, accidents resulting in injury or property damage due to poor adjustment are reduced.

[0013]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a block diagram of a work platform elevating device for a track vehicle according to the present invention, and FIG. 3 shows a schematic external view of the track vehicle. In these figures, 1 is a vehicle, 1-1 is a front wheel, 1-2 is a rear wheel, 2 is a workbench, 3 is a sensor section, 4 is an operation panel, 5 is a position detection sensor, 6 is a motor, and 7 is a workpiece. Base side control unit, 8 is an operation switch, 9
is the optical fiber cable, 10 is the vehicle side control
11 is an emergency lowering switch, 12 is a hydraulic control solenoid valve, 13 is a hydraulic pipe, 14 is a lifting hydraulic cylinder, 23 is a rail, 24 is an iron wheel, and 25 is a support member.

The optical fiber cable 9 is employed to communicate between the workbench control unit 7 and the vehicle control unit 10 in an electrically insulated state. Both control units are naturally equipped with arrangements for converting between electrical and optical signals. In addition, the emergency lowering switch 11
is a switch that allows the work platform 2 to be lowered even from the vehicle 1 in an emergency.

The track running vehicle shown in FIG. 3 can also run on normal roads, and the track running vehicle 1 includes:
It has tires front wheel 1-1 and rear wheel 1-2. When traveling on the rails 23, the iron wheels 24 supported by the support members 25 are lowered so as to fit on the rails at the front and rear of the vehicle. The rear wheel 1-2, which is a driving wheel, remains in contact with the rail 23, and the front tire wheel 1-1 is lifted off the rail by pushing up the front part of the vehicle body using hydraulic pressure.

The iron wheels 24 only run as a guide along the rails 23, and the driving force for forward and backward movement is provided by the rear wheels 1.
Supplied from -2. When driving on the road, iron wheels 2
4 is pulled up and stored.

The workbench 2 is raised and lowered by a hydraulic cylinder 14 for raising and lowering. The workbench 2 is equipped with an operation panel 4 provided with switches for various operations, and a sensor section 3 for detecting the position of a work object.

As shown in FIG. 1, the sensor section 3 includes at least a position detection sensor 5 and a motor 6 for moving the position detection sensor 5 in the horizontal direction. The operation panel 4 includes at least a workbench side control unit 7 and an operation switch 8. Operation switch 8
is a switch that instructs the position detection sensor 5 to start or stop detecting a work target, for example.

The hydraulic pipe 1 is activated by a signal sent from the vehicle-side control unit 10 to the hydraulic control solenoid valve 12.
Hydraulic pressure is supplied to and released from the lifting hydraulic cylinder 14 through the hydraulic cylinder 3, and the workbench 2 is moved up and down. Conventionally, this instruction was given by a worker operating the operation panel 4, but in the present invention, it is automatically given as described below.

That is, the sensor unit 3 detects the object to be worked on (for example, an overhead wire).
The position of the workbench 2 is detected, and the workbench 2 is raised and lowered based on the detection signal so that the relative position with respect to the workpiece becomes a predetermined position. FIG. 2 shows a diagram illustrating the operation of the sensor unit 3. Here, an explanation will be given using an overhead wire as an example of the work target. In FIG. 2, 5-1 and 5-2 are cameras as position detection sensors, 15 is a camera controller, 16 is an adapter, 20 and 20-1 are overhead wires to be worked on, L1, L2
is the set distance. By setting L1 and L2, the relative position between the overhead wire 20 and the position detection sensor is determined.

In this example, two cameras are used as position detection sensors. Before starting the work, the distance from the overhead wire 20 to be worked is set to the desired L1.
, L2 to focus. When the vehicle 1 moves on the rail 23, the overhead wire changes to the position 20-1, for example, for the reason explained in FIGS. 4 and 5.

Then, the cameras 5-1 and 5-2 are out of focus. A detection signal indicating the misalignment is transmitted to the workbench-side control unit 7 in FIG. 1 via the camera controller 15 and the adapter 16. Workbench side control・
The unit 7 includes a motor 6 and a lifting hydraulic cylinder 14.
A command is issued to the camera to drive the camera so that the out-of-focus is minimized. Commands to the lifting hydraulic cylinder 14 are transmitted via the vehicle-side control unit 10 and the hydraulic control solenoid valve 12.

In this way, the cameras 5-1 and 5-2 are moved to the set distance L1 with respect to the overhead wire 20-1.
, L2, the height of the workbench 2 is adjusted to an appropriate position.

Note that if the thickness, size, etc. of the object to be worked on are determined by image processing, only one camera may be used. Further, as the position detection sensor, a sensor that measures distance using a laser or ultrasonic waves may be used.

FIG. 6 shows a flowchart illustrating the automatic lifting operation as described above. Item number in the following explanation■
~■ correspond to steps ■~■ in the flowchart. ■ First, set the initial position of the position detection sensor 5. In FIG. 2, this corresponds to setting the set distances L1 and L2. (2) Determine whether the horizontal position from the position detection sensor 5 to the work object has changed. In the example of FIG. 2, this can be seen by the camera being out of focus. ■ If there is a change, move in the direction of decreasing the amount of change (
Move the sensor horizontally (in the direction that reduces the focus shift). In the example of FIG. 1, it is moved by a motor 6. (2) Determine whether the vertical position from the position detection sensor 5 to the work object has changed. ■ If there is a change, move in the direction of decreasing the amount of change (
(in a direction that reduces the focus shift), move the workbench 2 up or down. (2) If there is no change in the position either horizontally or vertically, the current position of the sensor section 3 is maintained. (2) Determine whether an instruction to stop the detection operation of the position detection sensor 5 has been received. If it comes, the operation will end. If it has not arrived, return to step (3) and continue the detection operation.

[0026]

As described above, according to the work platform elevating device for a track vehicle of the present invention, the sensor attached to the work platform of the track vehicle detects the relative position of the object to be worked on, and the detection signal is The lifting hydraulic cylinder is actuated to raise and lower the workbench so that the relative position between the sensor and the workpiece becomes a predetermined value. Therefore, the following effects are achieved.

(2) The worker no longer has to perform lifting and lowering operations every time, and is relieved from the fatigue caused by such operations. ■
Since the height of the workbench is automatically adjusted to a preset relative position for ease of work, accidents resulting in injury or property damage due to poor adjustment are reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a work platform elevating device for a track vehicle according to the present invention.

[Figure 2] Diagram explaining the operation in the sensor section

[Figure 3] Schematic diagram of the appearance of a track running vehicle

[Figure 4] Diagram explaining the reason why horizontal changes occur in the overhead wire position

[Figure 5] Diagram explaining the reason why vertical changes occur in the overhead wire position

[Figure 6] Flowchart explaining automatic lifting/lowering operation

[Explanation of symbols]

1 Vehicle 1-1 Front wheel 1-2 Rear wheel 2 Workbench 3 Sensor section 4 Operation panel 5 Position detection sensor 5-1, 5-2 Camera 6 Motor 7 Workbench side control unit 8
Operation switch 9 Optical fiber cable 10 Vehicle side control unit 11 Emergency lowering switch 12 Hydraulic control solenoid valve 13 Hydraulic pipe 14 Lifting hydraulic cylinder 15 Camera controller 16 Adapter 17 Workbench support frame 20 Catenary line 20-1 Catenary line 22 Hanging line 23 Rail 24 Iron wheel 25 Support member

Claims (1)

[Claims] 1. A sensor mounted on a workbench that detects a relative position with respect to a work object, and a lifting hydraulic cylinder that raises and lowers the workbench so that the relative position becomes a predetermined value based on a detection signal from the sensor. A work platform elevating device for a track vehicle, characterized by comprising: