JP2003002591A - High-lift-working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify constitution as an attitude control system for a working table, facilitate attaching work, reduce a cost, and reduce a failure rate. SOLUTION: This high-lift working vehicle 1 of the present invention equipped, via a joint shaft 7, with the working table 8 in the tipmost end of plural booms 4, 6 provided turnably around joint shafts 3, 5 in order from the body support base 2 side is provided with an actuator 9 provided between the tipmost end of the plural booms 4, 6 and the working table 8 to change an attitude of the working table 8, an attitude detecting means 11 mounted on the working table 8 to detect the attitude of the working table 8, and a working table attitude controlling means 10 for commanding the actuator 9 based on a detection result by the attitude detecting means 11 to balance the working table 8.

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 equipped with a work platform at the tip of a boom.

[0002]

2. Description of the Related Art Conventionally, a work vehicle at a high place such as a ladder car is provided with a single or a plurality of booms on its body support table, and a work table (basket) is equipped at the tip of the boom. However, the floor of the workbench needs to be kept horizontal regardless of the posture of the boom, and thus the workbench is horizontally controlled.

FIG. 2 is an explanatory view of a conventional horizontal control method for a workbench in an aerial work vehicle. In the figure, a boom 102 is provided on a vehicle body support base 100 via a joint shaft 101, a boom 104 is provided on a tip end of the boom 102 via a joint shaft 103, and a joint shaft is further provided on a tip end of the boom 104. A workbench 106 is provided via 105. A cylinder 107 is provided between the tip of the boom 104 and the workbench 106. Further, angle detectors 201, 203, 205 for detecting the rotation angles of the respective joint axes 101, 103, 105 are arranged, and the angle data detected by these angle detectors 201, 203, 205 are It is designed to be sent to the boom control device 200 installed on the vehicle body support base 100.

Under such a structure, the boom control device 200 has the angle detectors 201, 203, 205.
The inclination of the workbench 106 is calculated based on the angle data sent from the workbench 106, and a command is issued to the cylinder 107 to output the workbench 1
Horizontal control is performed so that the floor surface of 06 is kept horizontal.

[0005]

However, in the above conventional work vehicle for aerial work, although the floor surface of the workbench 106 can be controlled horizontally, it is necessary to provide an angle detector for each joint axis. From each of the angle detectors to the boom controller 20
It was necessary to wire signal lines (cables) to 0, the configuration was complicated, the mounting work was complicated, and the cost was high. Further, if even one of the plurality of angle detectors fails, the control itself becomes impossible and the failure rate of the system is large.

The present invention has been proposed in view of the above,
It is an object of the present invention to provide an aerial work vehicle that has a simple configuration as a posture control system for a workbench, can be easily attached to the workbench, can reduce costs, and can reduce the failure rate.

[0007]

In order to achieve the above-mentioned object, the invention according to a first aspect of the present invention is such that the work is carried out via the joint shaft at the tip of a boom which is provided up and down around the joint shaft of the vehicle body support base. In an aerial work vehicle equipped with a platform, an actuator that is provided between the boom tip and the platform and that can change the orientation of the platform, and posture detection that is mounted on the platform and detects the orientation of the platform And a worktable attitude control means for instructing the actuator based on the detection result of the attitude detection means to keep the worktable in equilibrium.

Further, the invention according to claim 2 is a high-altitude work in which a workbench is provided at the leading end of a plurality of booms that are provided up and down around the joint shaft in order from the vehicle body support base side through the joint shaft. In the vehicle, an actuator that is provided between the tip of the plurality of booms and the workbench and that can change the attitude of the workbench, and attitude detection means that is mounted on the workbench and detects the attitude of the workbench, Workbench posture control means for instructing the actuator based on the detection result of the posture detection means to keep the workbench in equilibrium.

Further, the invention described in claim 3 is characterized in that, in addition to the structure of the invention described in claim 1 or 2, the work platform attitude control means is provided on the work platform.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing the construction of an aerial work vehicle according to the present invention. In the figure, the aerial work vehicle 1 of the present invention includes:
A boom 4 is provided on the vehicle body support 2 via a joint shaft 3,
A boom 6 is provided at the tip of the boom 4 via a joint shaft 5, and a workbench 8 is provided at the tip of the boom 6 via a joint shaft 7. An actuator 9 is provided between the tip of the boom 6 and the workbench 8. The actuator 9 includes, for example, a hydraulic pump 9a.
A hydraulic cylinder that operates at is used. Joint axes 3, 5,
Each of the members 7 rotates about its axis, and changes the posture of the boom near the tip of the joint shaft so that the boom can rise and fall freely according to the rotation.

The workbench 8 has an angle detector (posture detection means) 11 and a workbench posture control device (workbench posture control means).
And 10 are arranged. The angle detector 11 detects the inclination of the floor surface of the workbench 8 and outputs the detection result to the workbench posture control device 10. The workbench posture control device 10
Based on the detection result of the angle detector 11, the inclination amount and the inclination direction of the workbench 8 are recognized, an attitude control signal for keeping the floor surface of the workbench 8 horizontal is generated, and the attitude control signal is used as an actuator. Output to 9. The actuator 9 expands and contracts the cylinder in response to the attitude control signal, thereby keeping the floor surface of the workbench 8 horizontal.

As described above, in the embodiment of the present invention, the angle detector 11 and the workbench posture control device 10 are arranged on the workbench 8, and the workbench posture control device 10 detects the detection result of only the angle detector 11. Since the posture control can be performed based on this, the number of angle detectors conventionally provided for each joint axis can be significantly reduced. In addition, the signal lines correspondingly also detect the angle detector 11 in the workbench 8 and the workbench posture control device 10.
And between the workbench posture control device 10 and the actuator 9 located in the vicinity thereof, and the conventional cable routing is not required. Therefore, the structure can be simplified as a whole, and the mounting work can be easily performed. Moreover, since the number of parts is significantly reduced, the failure rate of the system can be lowered. Furthermore, the system can be constructed only with the workbench 8 and its vicinity, and the number of booms can be easily increased or decreased.

In the above description, the present invention is applied to an aerial work vehicle having two booms, but the number of booms may be arbitrary, and only one boom or three or more booms is used. In this case, the present invention can be similarly applied.

Although a hydraulic cylinder is used as the actuator 9, any actuator may be used as this actuator, for example, an electrically driven one may be used.

Further, the workbench posture control device 10 is attached to the workbench 8
Although it is not necessarily the workbench 8, it may be arranged on the tip end side of the boom on the most distal end side, for example.

[0017]

As described above, in the aerial work vehicle of the present invention, the workbench posture control means can carry out the posture control based on the detection result of only the posture detection means arranged on the workbench. The number of angle detectors conventionally provided for each joint axis can be greatly reduced. Further, accordingly, the signal line may be provided only between the posture detecting means in the workbench and the workbench posture control device, or between the workbench posture control means and the actuator located in the vicinity thereof, which is the same as in the conventional case. It also eliminates the need to run various cables. Therefore, the structure can be simplified as a whole, and the mounting work can be easily performed. Moreover, since the number of parts is significantly reduced, the failure rate of the system can be lowered.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an aerial work vehicle of the present invention.

FIG. 2 is an explanatory diagram of a conventional horizontal control method for a workbench in an aerial work vehicle.

[Explanation of symbols]

1 aerial work vehicle 2 Body support 3 joint axes 4 boom 5 joint axes 6 boom 7 joint axis 8 workbench 9 Actuator 9a hydraulic pump 10 Workplace posture control device 11 Angle detector

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ki ▲ Yasuhiro Yasuhiro             3-1-2 Kyobashi, Chuo-ku, Tokyo Japan aircraft             Machine Industry Co., Ltd. F-term (reference) 3F333 AA08 AB02 AC01 BB09 BD02                       BE02 DB03 FA17 FD08 FE04                       FE09

Claims (3)

[Claims] 1. An aerial work vehicle in which a work platform is provided at the tip of a boom that is provided up and down around a joint axis of a vehicle body support platform through the joint axis, and the work platform is provided between the boom tip and the work platform. An actuator capable of changing the posture of the workbench, a posture detection means mounted on the workbench for detecting the posture of the workbench, and a command to the actuator based on the detection result of the posture detection means to balance the workbench. An aerial work vehicle, comprising: 2. An aerial work vehicle in which a work platform is provided at the leading edge of a plurality of booms that are provided up and down around the joint axes in order from the vehicle body support side, and the boom of the plurality of booms is the highest. It is provided between the tip and the workbench,
An actuator that can change the posture of the workbench, a posture detection unit that is mounted on the workbench and detects the posture of the workbench, and commands the actuator based on the detection result of the posture detection unit to keep the workbench in balance. An aerial work vehicle comprising: a workbench posture control means. 3. The aerial work vehicle according to claim 1, wherein the work platform attitude control means is provided on the work platform.