JP2003221192A - Level control device for work bench in high lift work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a level control device for a work bench in a high lift work vehicle which can always horizontally hold the work bench by an electric motor-driven actuator in no relation to hoisting operation of a boom to be applicable for even a hybrid car and an electric vehicle. <P>SOLUTION: This high lift work vehicle, mounting a boom 3 having a work bench 5 to at least freely operate boom hoisting in a car body 1, is provided with a tilt sensor 10 detecting a difference of a horizontal angle of the work bench 5 relating to a horizontal surface on the ground and an electric motor- driven actuator 11 placing the work bench 5 in a level based on the detection result of this tilt sensor 10. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal control device for maintaining the level of a work table in an aerial work vehicle for carrying out work at high places by arranging the work table at a high place with a boom. .

[0002]

2. Description of the Related Art FIG. 7 shows an example of the overall construction of a conventional work platform for aerial work.

In FIG. 7, reference numeral 1 denotes a vehicle body of an aerial work vehicle, on which a swivel base 2 has a swivel motor (not shown).
It is mounted so that it can rotate freely. A boom 3 is provided on the upper end of the swivel base 2 so that the boom 3 can be raised and lowered.

The boom 3 is of a multi-stage telescopic type and can be telescopically moved by a telescopic cylinder (not shown).
The hoisting cylinder 4 is disposed between the swivel base 2 and the swivel base 2 so as to hoist. And at the tip of the boom 3,
A work table 5 is provided so as to be horizontally rotatable.

Reference numerals 6 denote jacks provided at four positions on the left and right sides of the front and rear of the vehicle body 1. Each jack 6 is constructed so as to extend laterally of the vehicle body by an outrigger (not shown).

Reference numeral 7 denotes a horizontal cylinder that always holds the work table 5 horizontally with respect to the ups and downs of the boom 3, and a driven cylinder 8 connected between the boom 3 and the swivel base 2 for ups and downs the boom 3. By performing the expansion / contraction operation accordingly, oil is exchanged between the driven cylinder 8 and the horizontal cylinder 7, whereby the horizontal cylinder 7 is expanded / contracted and the workbench 5 is held horizontally.

Therefore, by placing the workbench 5 horizontally by expanding, contracting, and swinging the boom 3 and arranging the workbench 5 at a predetermined high position, an operator on the workbench 5 can perform work at a high position. it can.

[0008]

However, in the conventional hydraulic cylinder using the parallel cylinder 7, the horizontal cylinder 7, the driven cylinder 8 and the pipes connecting the horizontal cylinder 7 and the driven cylinder 8 are connected to each other. If oil leaks, the workbench will be displaced horizontally. In this case, it is necessary to correct the workbench 5 so that it is horizontal, but there is a problem in that it takes time and effort to replenish oil and prevent oil leakage, which is a heavy burden.

[0009]

According to a first aspect of the present invention, there is provided a horizontal control device for a work platform in an aerial work vehicle, comprising: A tilt sensor for detecting a difference in horizontal angle of the work table with respect to a horizontal plane on the ground, and an electric actuator for leveling the work table based on a detection result of the tilt sensor are provided.

According to a second aspect of the present invention, there is provided a horizontal control device for a work platform in a work platform for an aerial work platform, wherein a boom having a work platform is mounted on a vehicle body at least so that the boom can be raised and lowered. First to detect the angle
An angle sensor, a second angle sensor that detects the angle of the workbench with respect to the boom, and an electric actuator that horizontally positions the workbench based on the detection results of the first angle sensor and the second angle sensor. is there.

According to a third aspect of the present invention, there is provided a horizontal control device for a workbench in an aerial work vehicle, wherein at least two proximal booms and distal booms are flexibly mounted on a vehicle body, and work is performed at the distal end of the distal boom. In an aerial work vehicle with a stand,
A third angle sensor that detects the angle of the base boom with respect to the vehicle body, a fourth angle sensor that detects the angle between the base boom and the tip boom, and a fifth angle sensor that detects the angle between the work boom and the tip boom. And an electric actuator that horizontally positions the workbench based on the detection results of the third angle sensor, the fourth angle sensor, and the fifth angle sensor.

[0012]

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

FIG. 1 shows a schematic structure of a horizontal control device for a workbench in an aerial work vehicle according to the present invention. The same members as those of the conventional work vehicle for aerial work described in the related art are designated by the same reference numerals and the description thereof will be omitted.

In this aerial work vehicle, the work table 5 is provided with an inclination sensor 10, and the work table 5 is held horizontally by an electric motor 11.

The tilt sensor 10 is for detecting a difference in horizontal angle of the workbench 5 with respect to a horizontal plane on the ground (a plane intersecting the direction of gravity of the earth at right angles).
The difference in the horizontal angle detected in step 2 is input to the control device 12 as shown in FIG. In the control device 12, the tilt sensor 10
An operation signal is output to the electric motor 11 so that the workbench 5 becomes horizontal on the basis of the detection result from. As a result, the electric motor 11 can be driven by a predetermined amount to level the workbench 5.

Therefore, with the jacks 6 provided on the vehicle body 1, the boom 3 is held while the vehicle body 1 is held horizontally and stably.
By performing ups and downs, expansion and contraction, etc., the workbench 5 can be arranged at a predetermined high place while being held horizontally.

As described above, the work table 5 using the tilt sensor 10
The electric motor 11 is driven based on the difference in the horizontal angle of the work table 5 to make the work table 5 horizontal, so that the work table 5 is moved to the boom 3
It is possible to always keep horizontal regardless of the ups and downs, and it is possible to secure the safety of the worker who rides on the work table 5 and works at high places.

Further, since the workbench 5 is operated so as to be corrected so that it becomes horizontal, the workbench 5 can be always maintained in a constant horizontal state without any horizontal deviation. , No need to fix the horizontal.

FIG. 3 shows another embodiment of the horizontal control device for the workbench in the aerial work vehicle of the present invention.

This aerial work vehicle is provided with a first angle sensor 20 and a second angle sensor 21 and holds the work table 5 horizontal by an electric motor 11.

The first angle sensor 20 is for detecting the angle θ1 of the boom 3 with respect to the vehicle body 1, and is also the second angle sensor 20.
The angle sensor 21 measures the angle θ of the workbench 5 with respect to the boom 3.
The angle .theta.1 and .theta.2 detected by the first and second angle sensors 20 and 21 are input to the controller 12 as shown in FIG.

The control device 12 calculates, based on the detection result from the first angle sensor 20, what angle the angle θ2 detected by the second angle sensor 21 should be to make the work table 5 horizontal, An operation signal is output to the electric motor 11 so that the calculated angle θ2 is obtained. As a result, the electric motor 11 can be driven by a predetermined amount to level the workbench 5.

Therefore, with the jacks 6 provided on the vehicle body 1, the boom 3 is held while the vehicle body 1 is held horizontally and stably.
By performing ups and downs, expansion and contraction, etc., the workbench 5 can be arranged at a predetermined high place while being held horizontally.

Thus, the first and second angle sensors 20, 2
By driving the electric motor 11 based on the angle information from 1 to make the work table 5 horizontal, the work table 5 can be always kept horizontal regardless of the hoisting motion of the boom 3, and the work table 5 can be mounted on the work table 5. It is possible to ensure the safety of workers who perform high-altitude work.

Further, since the workbench 5 is operated in such a manner that it is corrected so that it becomes horizontal at any time, the workbench 5 can always be reliably kept in a constant horizontal state without being horizontally displaced. , No need to fix the horizontal.

FIG. 5 shows still another embodiment of the horizontal control device for the workbench in the aerial work vehicle according to the present invention.

In this aerial work vehicle, two booms, a base boom 30 and a tip boom 31, are flexibly mounted, and a workbench 5 is provided at the tip of the tip boom 31 via an electric motor 11. There is.

The aerial work vehicle thus constructed has the third angle sensor 32, the fourth angle sensor 33 and the fifth angle sensor 32.
The angle sensor 34 is provided, and the work table 5 is held horizontal by the electric motor 11.

The third angle sensor 32 is for detecting an angle θ3 of the boom 3 with respect to the vehicle body 1, and the fourth angle sensor 33 is an angle θ between the base boom 30 and the tip boom 31.
The fifth angle sensor 34 is for detecting the angle θ5 of the workbench 5 with respect to the tip boom 31, and the third, fourth, and fifth angle sensors 32, 3,
The angles θ3, θ4, and θ5 detected at 3 and 34 are input to the controller 12 as shown in FIG.

In the control device 12, based on the detection results from the third and fourth angle sensors 32 and 33, what is necessary is to set the angle θ5 detected by the fifth angle sensor 34 in order to make the work table 5 horizontal. Is calculated, and an operation signal is output to the electric motor 11 so that the calculated angle θ5 is obtained. As a result, the electric motor 11 can be driven by a predetermined amount to level the workbench 5.

Therefore, the workbench 5 is held horizontally by raising and lowering the base boom 30 and the tip boom 31 while the body 6 is held horizontally and stably by the jacks 6 provided on the body 1. However, it can be placed at a predetermined height.

Thus, the third, fourth and fifth angle sensors 3 are
The electric motor 1 based on the angle information from 2, 33, and 34.
By driving 1 to make the work table 5 horizontal, the work table 5 can be always kept horizontal regardless of the up-and-down movement of the boom 3, and it is possible for an operator who rides on the work table 5 to perform high-altitude work. It is possible to ensure safety.

Further, since the workbench 5 is operated so as to be corrected so that it becomes horizontal, the workbench 5 can be always maintained in a constant horizontal state without any horizontal deviation. , No need to fix the horizontal.

Although the two booms of the base boom 30 and the tip boom 31 are freely erected, the number of booms may be three or more, and each boom can be changed depending on the number of booms. This can be dealt with by adding an angle sensor that detects the angle between them.

In each of the above-mentioned embodiments, an electric motor is used as an example of the electric actuator, but the electric actuator may be an electric cylinder or an electric motor.

By using such an electric actuator, the workbench 5 can be held horizontally by using the power source of the hybrid car or the electric vehicle, and the boom 3 described above can be used for the hybrid car or the electric vehicle. It is possible to mount an aerial work device equipped with the work table 5 and the work table 5.

[0037]

As described above, according to the horizontal control device for a workbench in an aerial work vehicle of the present invention, the workbench is boomed by operating the electric actuator based on the information from the tilt sensor and the angle sensor. It is possible to always keep horizontal regardless of the undulating motion of, and to secure the safety of the worker who rides on the work table and works at high places.

Further, since the workbench is operated in such a manner that it is always corrected so that it becomes horizontal, it is possible to always maintain a constant horizontal state without causing a horizontal shift of the workbench, and to keep the workbench horizontal. It becomes unnecessary to correct the work, and the work load can be reduced.

Further, since the workbench is held horizontally by using the electric actuator, it becomes possible to mount an aerial work apparatus having a boom and a workbench on a hybrid car or an electric vehicle.

[Brief description of drawings]

FIG. 1 is an overall view showing a schematic configuration of a horizontal control device for a workbench in an aerial work vehicle of the present invention.

FIG. 2 is a block diagram showing a control system of a horizontal control device.

FIG. 3 is an overall view showing another example of a horizontal control device for a workbench in an aerial work vehicle according to the present invention.

FIG. 4 is a block diagram showing a control system of the horizontal control device.

FIG. 5 is an overall view showing still another example of the horizontal control device for the workbench in the aerial work vehicle of the present invention.

FIG. 6 is a block diagram showing a control system of the horizontal control device.

FIG. 7 is an overall view showing a conventional aerial work vehicle.

[Explanation of symbols]

1 car body 3 boom 30 base boom 31 tip boom 5 Workbench 10 Tilt sensor 11 electric motor 20 First angle sensor 21 Second angle sensor 32 Third angle sensor 33 4th angle sensor 34 Fifth angle sensor

Claims (3)

[Claims] 1. In an aerial work vehicle in which a boom having a workbench is mounted on a vehicle body so that it can be raised and lowered, an inclination sensor for detecting a difference in horizontal angle of the workbench with respect to a horizontal plane on the ground, and detection of the inclination sensor. A horizontal control device for a work table in an aerial work vehicle, comprising: an electric actuator for horizontally setting the work table based on a result. 2. A high-altitude work vehicle in which a boom having a workbench on a vehicle body is mounted at least up and down, and a first angle sensor for detecting an angle of the boom with respect to the vehicle body, and an angle of the workbench with respect to the boom are detected. Second
A horizontal control device for a work platform in an aerial work vehicle, comprising: an angle sensor; and an electric actuator that horizontally positions the work platform based on detection results of the first angle sensor and the second angle sensor. 3. An aerial work vehicle in which at least two proximal booms and distal booms are flexibly mounted on a vehicle body, and a work platform is provided at the distal end portion of the distal booms. Third to detect the angle of
An angle sensor, a fourth angle sensor that detects an angle between the base boom and the tip boom, a fifth angle sensor that detects an angle between the work boom and the tip boom, a third angle sensor, a fourth angle sensor, and a fourth angle sensor. A horizontal control device for a workbench in an aerial work vehicle, comprising: an electric actuator that horizontally positions the workbench based on each detection result of the five-angle sensor.