JP2001180897A - Checking device of vehicle for high lift work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly and efficiently check a vehicle for high lift work. SOLUTION: In the vehicle for high lift work disposed with a boom on a movable vehicle so that turning, derricking and telescoping are possible, and mounted with a working platform on a tip of the boom, the boom, etc., is moved to the preset checking position by achieving turning, derricking and telescoping of the boom with a check start switch 25 being turned on to determine whether or not the detected value of each sensor 33 is in a normal range when the boom is moved to the checking position, then, the checking is started. The working speed of turning, derricking and telescoping of the boom when the boom or the working platform is moved to the checking position with the check start switch 25 turned on is set to be lower than the working speed in a normal operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial work vehicle constructed by disposing an elevating means for elevating and lowering a worktable on a movable vehicle, and more particularly, to a work of the aerial work vehicle. The present invention relates to an inspection device for performing an inspection at the time of start or the like.

[0002]

2. Description of the Related Art An aerial work vehicle is used, for example, for wiring work on a utility pole. The work platform is operated by turning a boom, raising and lowering and extending and retracting the work table while an operator is on the work table. An operator who has moved to a desired height and boarded the work table performs wiring work or the like at a height. There is also a type of aerial work vehicle in which a workbench is vertically moved up and down using a scissor link, a vertical elevating cylinder, and the like, and these are collectively referred to as an aerial work vehicle. In the aerial work vehicle, which is a device for moving an operator to a high place, it is not preferable from the viewpoint of safety to operate the device while there is an abnormality in the device. The operation is checked beforehand to make sure that there is no abnormality before starting work.

[0003] For this reason, an inspection start switch for performing a pre-operation inspection is provided in an aerial work vehicle or the like, and a configuration is provided in which the inspection start switch is turned on to perform a predetermined pre-operation inspection before starting work. Generally adopted. In such a start-up inspection, the boom is swung, raised and lowered, extended and retracted, etc. (in the case of a vertical lifting type aerial work vehicle, the vertical lifting means is activated) with the inspection start switch turned on. Move the worktable and boom at the tip to the preset inspection position, and perform the inspection operation by judging whether the detection values of the detectors when this worktable moves to the inspection position are within the normal range. Was configured as follows.

[0004]

Here, it is determined whether the boom or the workbench has moved to the inspection position by, for example, determining the boom turning angle, the up-and-down angle, and the boom angle corresponding to the inspection position.
A mark indicating the amount of extension is provided, and the operator operates the operation lever to perform the turning operation, the up / down operation, the expansion / contraction operation, etc. of the boom, and visually checks whether the boom has been moved to the position where the mark is provided. I was checking. However, there is a problem that it is difficult to perform the positioning, for example, a subtle operation of the operation lever is required for each positioning of the boom when the boom is moved to the inspection position. Further, there is a problem that the inspection time is too long if the positioning is performed slowly.

The present invention has been made in view of such a problem.
An object of the present invention is to provide an inspection device for an aerial work vehicle having a configuration capable of performing an inspection such as a pre-operation inspection on an aerial work vehicle accurately and efficiently.

[0006]

In order to achieve the above object, the inspection device according to the present invention comprises a lifting means for raising and lowering a worktable on a movable vehicle (for example, a boom of a boom type aerial work vehicle, A vertical aerial vehicle composed of a vertical aerial work vehicle scissors link and the like) is arranged, and the elevating means is operated with the inspection start switch turned on to operate the elevating means or work. The platform is moved to a preset inspection position, and the inspection operation is performed by judging whether the detection value of each detector when the lifting / lowering means or the work table is moved to the inspection position is within a normal range. Is done. At this time, the operation speed of the elevating means or the elevating means when moving the workbench to the inspection position with the inspection start switch turned on is set to be lower than the operating speed during normal work.

With the inspection device having such a configuration, with the inspection start switch turned on, for example, the operating lever is operated to operate the lifting / lowering means, and the lifting / lowering means or the work table is set at a predetermined inspection position. When moving to, because the moving speed is lower than the speed during normal work,
Fine positioning is easy when moving the lifting / lowering means to a predetermined position, and accurate inspection is possible.

The operating speed of the lifting / lowering means when the check / start switch is turned on and the lifting / lowering means or the worktable is moved to the inspection position is adjusted until the lifting / lowering means or the worktable reaches a range close to the inspection position. May be set to a high speed, and may be set to a low speed in the vicinity range. With this configuration, each operation of the lifting / lowering means is performed at a high speed until the lifting / lowering means or the worktable reaches the vicinity of the inspection position, so that the inspection time as a whole is shortened.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows an example of a boom type aerial work vehicle having the inspection device according to the present invention. The aerial work vehicle 1 includes a swivel 3 that is disposed on a vehicle body 2 of a vehicle that can travel with a driving cabin 2a and that can be horizontally turned with respect to the vehicle body by the operation of a swing motor (not shown). A boom 4 which is raised and lowered by a raising and lowering cylinder 12 is pivotally mounted on 3. The boom 4 includes a telescopic boom 4a, an intermediate boom 4b, and a distal boom 4c, which are telescopically moved by a built-in telescopic cylinder 13. The base end of the base boom 4 a is pivotally connected to the swivel 3.

A vertical post 6 which is always vertically held by a leveling cylinder (not shown) is pivotally connected to the distal end of the distal end boom 4c, and a worktable 8 can be horizontally turned on the vertical post 6 via a swing arm 7. (Swing freely). A lifting device 9 is provided at the upper end of the end boom 4c, and can lift heavy objects. Outrigger jacks 18 are provided on the front, rear, left and right sides of the vehicle body 2, and when working at a high place, the outrigger jacks 18 extend downward to lift and support the vehicle body 2 stably.

An upper operating device 20 is provided on the work table 8, and a lower operating device 21 is provided on a rear portion of the vehicle body 2. Therefore, the operator on the work table 8 can operate the upper operation device 20 to perform the turning operation of the swivel table 3 and the operation of raising and lowering and extending and retracting the boom 4, and the operator on the ground can perform the lower operation. A similar operation can be performed by operating the device 21. A jack operating device 22 is also provided at the rear part of the vehicle body 2 to operate the outrigger jack.

An inspection device including an inspection start switch is provided adjacent to the lower operation device 21, and the overall configuration of the control device including the inspection device will be described with reference to FIG. This control device has a control unit 30 to which operation signals from an upper operation device 20 (operation levers and switches) and a lower operation device 21 (operation levers and switches) are input. Control unit 3
In response to the operation signal, the turning operation of the turning table 3 by the turning motor 11 and the raising / lowering cylinder 12 are performed.
, The expansion and contraction operation of the boom 4 by the telescopic cylinder 13, the swinging operation of the worktable 8 by the swinging motor 14, and the like. Note that, specifically, each operation is performed by a hydraulic cylinder, a motor, and the like, and the control unit 30 controls the operation of the electromagnetic control valve to control the operations of the hydraulic cylinder, the motor, and the like.

The upper operating device 20 is also provided with levers for controlling the operation of the lifting device 9. When operation signals of these levers are input to the control unit 30, the control unit 30 activates the winch motor 15. Control. Further, when the jack operating device 22 provided at the rear of the vehicle body is operated and its operation signal is input to the control unit 30, the controller 30 controls the operation of the outrigger jack 18. The hydraulic cylinders and motors whose operations are controlled by the controller 30 are collectively called actuators.

An inspection start switch 25 is provided at the rear of the vehicle body 2 adjacent to the lower operating device 21 (or together with the lower operating device 21). ing. The start-up inspection is to check whether the operation of each device is normal before starting work every day, and by operating the lower operation device 21 and the jack operation device 22 with the inspection start switch 25 turned on. It is checked whether or not each actuator operates normally in response to these operations. The inspection start switch 25 may have an on / off switch configuration, a switch configuration that switches on and off each time a pressing operation is performed, or a switch configuration that is turned on only during a pressing operation. Therefore, when the inspection start switch 25 is turned on, the start-up inspection procedure is instructed by the start-up inspection procedure instructing device 35, and the operator operates the lower operation device 21 and the like according to the instruction procedure to perform the start-up inspection. The start-up inspection procedure instructing device 35 is composed of, for example, a display, but may be configured not to include the procedure instructing device 25 and to operate the lower operating device 21 according to a manual or the like. When an abnormality is found in this inspection, an alarm is issued by the alarm device 36.

For this start-up inspection, for example, as shown in FIG. 3, an inspection position mark M is provided on the base end boom 4a, and the operator operates the boom operation lever to operate the boom 4b.
To move the inspection position mark M to a position where the inspection position mark M overlaps the upper edge line 3a of the swivel 3. The detection value of the sensor (for example, the undulation angle sensor) 33 at this time is input to the control unit 30, and it is determined whether the detection value is normal in the unit and a start-up inspection is performed.

Here, in order to perform an accurate start-up inspection,
The boom 4 must be raised and lowered so that the inspection position mark M exactly overlaps the upper edge line 3a. However, the boom 4 is normally set to be moved at a high speed for the purpose of quick work and the like. ing. That is, a relatively large value is set as the operation output gain of the actuator in response to the operation signal of the operation lever, and the engine for driving the hydraulic pump that supplies the operation oil pressure to the actuator is operated with a large accelerator opening. I have. For this reason, for example, a subtle operation is required for operating the operation lever that moves the boom 4 at a high speed in response to the operation of the boom operation lever and positions the inspection position mark M so as to overlap the upper edge line 3a. , Difficult to align.

For this reason, in the present inspection device, when the inspection start switch 25 is turned on, the operation output gain of the actuator in response to the operation signal of the operation lever is set to a small value by the speed setting device 32 in the control unit 30. As a result, the operating speed of the actuator when the operator operates the operating lever (for example, the up / down operating speed of the boom) is lower than the operating speed for operating the operating lever during the actual operation, and the operating speed for the inspection position mark is reduced. Positioning is facilitated. In this device,
When the check start switch 25 is turned on, the operation of an accelerator control device 37 for controlling the accelerator opening of the engine can be controlled to reduce the accelerator opening and reduce the engine rotation for driving the hydraulic pump at low speed. Thus, the operating speed of the boom may be reduced.

However, if the operation speed of the actuator is always kept low during the start-up inspection, there is a problem that the time for moving the boom or the like to the inspection position becomes longer, and the inspection time becomes longer. For this reason, in the device of the present invention, the inspection position information of the boom, the workbench, etc. is stored in the inspection position memory 31, and based on the output from the sensor 33, whether the boom or the like is located within the vicinity of the inspection position. It may be configured to determine whether or not the operation speed of the actuator is high before reaching the vicinity range, and to set the operation speed of the actuator to low speed only within the vicinity range. With this configuration, the actuator operates at a low speed within the range required for the alignment, so that the inspection position can be easily aligned, and outside the range, the actuator operates at a high speed, so that the inspection time can be reduced. .

In the above description, a boom type aerial work vehicle in which a boom which can be raised and lowered and which can be freely extended and retracted is provided on a swivel on a vehicle body and a work table is attached to the end of the boom has been described as an example. The inspection device according to the present invention can be similarly applied to a so-called vertical lifting type aerial work vehicle.

[0020]

As described above, according to the present invention,
With the inspection start switch turned on, the boom is swiveled, raised and lowered, extended and retracted, and the boom or platform is moved to the preset inspection position. The inspection operation is performed by judging whether the detection value of each detector is within the normal range, but the moving speed when moving the boom or the platform to the inspection position is normal operation. Since the speed is lower than the speed, the delicate positioning when the boom is positioned at the predetermined position is easy, and accurate inspection is possible.

When the boom or the workbench is moved to the inspection position with the inspection start switch turned on, the operating speed of the boom, such as the swiveling operation, the up-and-down operation, and the expansion / contraction operation, is set within the vicinity range including the inspection position. Alternatively, the speed may be set to be high until the work table reaches, and may be set to be low within the vicinity range. With this configuration, each operation of the boom is performed at a high speed until the boom or the workbench reaches the vicinity of the inspection position, so that the inspection time as a whole can be shortened.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an operation control device of an aerial work vehicle including an inspection device according to the present invention.

FIG. 2 is a perspective view of an aerial work vehicle having an inspection device according to the present invention.

FIG. 3 is an explanatory view illustrating marks for adjusting the boom undulation position when an inspection is performed by the inspection device according to the present invention.

[Explanation of symbols]

 2 Body 3 Turntable 4 Boom 8 Workbench 20 Upper operating device 21 Lower operating device 22 Jack operating device 25 Inspection start switch 30 Control unit 31 Inspection position memory 32 Speed setting device 33 Sensor (elevation angle sensor) 35 Start-up inspection procedure instruction device 36 Alarm

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3F333 AA08 AB04 BA12 BB03 BD02 CA24 DA10 DB05 FA17 FA29 FA40 FD07

Claims (2)

[Claims] 1. An inspection device for an aerial work vehicle, comprising a lifting means for raising and lowering a worktable on a movable vehicle, comprising an inspection start switch for performing an inspection operation. When the elevating means is operated with the inspection start switch turned on to move the elevating means or the worktable to a preset inspection position, and the elevating means or the worktable is moved to the inspection position. The inspection operation is performed by judging whether or not the detection value of each of the detectors is within the normal range, and the lifting / lowering means or the work table is moved to the inspection position with the inspection start switch turned on. The working speed of the lifting means at the time is set lower than the working speed at the time of normal work. 2. The operating speed of the lifting / lowering means when the lifting / lowering means or the work table is moved to the inspection position with the inspection start switch turned on is set within the vicinity range including the inspection position. 2. The inspection device for aerial work vehicles according to claim 1, wherein the inspection device is set at a high speed until the work table reaches, and is set at a low speed in the vicinity range.