JPH10175797A - Work table leveling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work table leveling device whereby the hoses can be arranged easily in the boom of an aerial platform, the operational responsiveness and follow-up capability for leveling of a leveling cylinder can be increased, and also a boom working vehicle itself can be used on the boom working vehicle with a detachable work table with few modification. SOLUTION: A hydraulic pump unit 20 which feeds hydraulic oil to a leveling cylinder 8 to swingably operate a working table 7, an inclination angle detector 22 which detects an inclination angle in the swinging direction of the working table 7 relative to a horizontal plane, and a control device 21 which controls the hydraulic oil feeding from the hydraulic pump unit 20 based on the signals from the inclination angle detector 22 so that the inclination angle relative to the horizontal plane of the working table 7 becomes zero are installed on the working table 7 so as to form a leveling device and enable leveling control only on the working table side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leveling device for a workbench for a worker to be mounted on a tip of a boom of an aerial work vehicle so as to be swingable up and down.

[0002]

2. Description of the Related Art Generally, an aerial work vehicle is provided with a swivel on a vehicle body so as to be swivelable, and a boom is attached to the swivel so as to be able to move up and down, expand and contract, and a worker mounts at the end of the boom. Work table is attached. And
The work table is moved to a desired height by operating the boom, so that the worker on the work table can perform work at a high place. In such an aerial work vehicle, it is required that the workbench is always kept horizontal. In general, a leveling device including an upper leveling cylinder and a lower leveling cylinder is often mounted. The upper leveling cylinder is provided between the tip boom and the work table, and the lower leveling cylinder is provided between the swivel table and the boom. The oil chambers on the bottom side and the oil chambers on the rod side of these leveling cylinders are communicated with each other, and the worktable is given a swinging motion opposite to the up-and-down operation of the boom, so that the worktable is leveled to keep its posture horizontal. It has become so.

[0003]

In recent years, multi-functional vehicles have become increasingly multifunctional, and a plurality of hoses for supplying hydraulic oil to other actuators having respective functions have been provided in a boom. Has become. Here, in the above-described leveling device, since a hose connecting the upper leveling cylinder and the lower leveling cylinder is also provided in the boom, it is necessary to provide a large number of hoses in the boom. It is becoming difficult to set up. Furthermore, since the leveling cylinder is provided at the distal end side and the proximal end side of the boom, the head of hydraulic oil is high and the oil path is long, thereby causing the hose to expand or pressure loss to occur. There is a problem that the operation responsiveness of the leveling cylinder and the followability of leveling are likely to be deteriorated.

[0004] In addition to the above-mentioned work vehicles, there are crane vehicles that can be used as a work vehicle at elevated height by detachably attaching a work table to the end of a boom. . In order to mount the worktable with such a crane truck by using the upper and lower leveling cylinders to level the worktable, it is necessary to separately provide a lower cylinder on the vehicle body side and arrange a hose in the boom. There is a problem that a large change is required.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and can easily arrange a hose in a boom of an aerial work vehicle. An object of the present invention is to provide a leveling device for a workbench that can improve followability and that can be used for a boom work vehicle with a detachable work table without substantially changing the boom work vehicle itself.

[0006]

In order to achieve the above-mentioned object, a worktable leveling device according to the present invention is provided with a workbench for a worker to be mounted on a tip end of a boom of a work vehicle so as to be vertically swingable. And a power source for supplying power to the actuator, a tilt angle detector for detecting a tilt angle from a horizontal plane in a swinging direction of the worktable, and the tilt angle detector. And a control device for controlling the operation of the actuator so that the inclination angle becomes zero based on the signal from the work table.

Specifically, as the actuator, a fluid pressure actuator which operates by a fluid pressure such as hydraulic pressure or pneumatic pressure, or an electric actuator which operates by electric power can be used. When a fluid pressure actuator is used, a pump unit composed of a prime mover and a pump is used to supply a pressure fluid such as oil or air to the power source, and when an electric actuator is used, power is supplied to the power source. An upper battery can be used.

According to such a configuration, the operation and control of the actuator are performed by the constituent members provided on the work table, and the swinging motion of the work table is controlled to perform leveling for maintaining the posture horizontally. be able to. For this reason, it is not necessary to provide a hose for the leveling cylinder in the boom as in the related art, and the piping configuration in the boom is simplified. When the actuator is composed of a fluid pressure actuator, the length of the hose connecting the pump unit and the fluid pressure actuator can be shortened, so that the response of the fluid pressure actuator and the followability of leveling are good and accurate leveling is possible. Become.

Here, when the actuator comprises a fluid pressure actuator operated by fluid pressure and the power source comprises a pump unit, and the pump unit comprises a pump and a motor for driving the pump, power is supplied to the motor. To operate the pump unit.

In this case, it is preferable to provide an accumulator on the workbench. According to such a configuration, the hydraulic actuator can be operated using the pressure fluid stored in the accumulator in addition to the pressure fluid from the pump unit, so that the capacity of the pump can be small.

Further, if the workbench is provided with an upper battery, the motor can be operated by the electric power supplied from the upper battery, and a lower power supply source and an upper power supply provided on the vehicle body side of the work vehicle are provided. If the connection means for connecting the battery is provided, the upper battery can be charged by the power supplied from the lower power supply source.

It is to be noted that, in place of the tilt angle detector, a swing angle detector for detecting a swing angle of the work table with respect to the boom is provided, and an elevation angle detector for detecting a boom angle is provided. The operation of the actuator may be controlled based on signals from the swing angle detector and the undulation angle detector so that the difference between the swing angle and the undulation angle becomes zero.

A connecting member is detachably attached to the end of the boom, and a working table is attached to the connecting member so as to be vertically swingable, and an actuator is provided on the connecting member so that the working table can be always kept horizontal. With the configuration in which the work table is held, the work table can be attached to and detached from the end of the boom via the connection member in a state where the leveling device is provided.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. First, the first example will be described. FIG. 2 shows the configuration of a first example of an aerial work vehicle equipped with the leveling device of the present invention. As shown in the drawing, this aerial work vehicle has a swivel 2 that can freely turn on a vehicle body 1, and a boom 3 is attached to the swivel 2 so that the boom 3 can be raised and lowered. The boom 3 includes a plurality of boom members, and is configured to be telescopically extendable.

A support member 5 is pivotally supported at the tip of the boom 3 so as to swing up and down. A vertical post 6 is attached to the support member 5 so as to extend upward, and a work table 7 for an operator is swinged (turned) on the vertical post 6.
Mounted freely. For this reason, the worktable 7 is swingable up and down with respect to the boom 3 and swingable. A leveling cylinder (fluid pressure actuator) 8 is attached to the tip of the boom 3 with one end pivotally connected. The other end of the leveling cylinder 8 is pivotally connected to the support member 5, and the worktable 7 is configured to swing up and down by the expansion and contraction of the leveling cylinder 8. An operating device 9 is provided on the work table 7 and the vehicle body 1.
3 can be turned, raised and lowered, or expanded and contracted.

As shown in FIG. 1, the workbench 7 is provided with a hydraulic pump unit 20. The hydraulic pump unit 20 includes a pump 20a and a motor 20b that drives the pump 20a. This motor 2
Either an engine or a battery-driven motor may be used for 0b. The pump 20a is connected to the leveling cylinder 8 by a hose 25 via a solenoid valve 21a in the control device 21.

Here, the control device 21 comprises a solenoid valve 21a and a controller 21b.
A detection signal from an inclination angle detector 22 for detecting an inclination angle of the worktable 7 from a horizontal plane in a swing direction of the worktable 7 is input to the controller 21b. Based on the detection signal, an operation signal is transmitted from the controller 21b. Is output to operate the solenoid valve 21a.

Although the hydraulic pump unit 20, the control device 21, and the inclination angle detector 22 are shown in the work table 7 in the drawing, they are actually put together at a predetermined position inside or outside the work table 7. Will be arranged.

In the aerial work vehicle constructed as described above, the operator on the workbench 7 operates the operating device 9 to operate the boom 3 and moves the workbench 7 to a desired height to perform work. Do. At this time, when the boom 3 is raised and lowered, the controller 2 is set so that the inclination angle of the working table 7 from the horizontal plane becomes zero.
An operation signal is output from 1b to the solenoid valve 21a, the expansion and contraction operation of the leveling cylinder 8 is controlled, and leveling for keeping the work table 7 horizontal is performed.

In the first example described above, the hydraulic pump unit 20 for supplying the working oil to the leveling cylinder 8 is provided on the worktable 7, so that the hose for supplying the working oil to the leveling cylinder 8 passes through the boom 3. There is no need to arrange between the vehicle body 1 and the leveling cylinder 8. Therefore, the arrangement of another hose in the boom 3 becomes easy. Further, since the solenoid valve 21a and the leveling cylinder 8 are provided close to each other and the hose 25 is short,
The operational response of the leveling cylinder 8 and the followability of leveling can be improved.

In the above-described leveling device, since the leveling can be performed by each component provided on the work table, this leveling device can be applied to an aerial work vehicle of a type in which the work table is detachably attached to the end of the boom. Easy to apply. In addition, as such an aerial work vehicle of this type, there is a work vehicle in which a worktable is detachably attached to the end of a crane boom. In this case, the work table 7 is configured as a unit with a leveling device (hereinafter, referred to as a work table unit), and is attached to and detached from the end of the boom as it is. Hereinafter, the configuration of the second example in such a case will be described.

FIG. 3 shows a configuration of a crane truck of a type in which such a work table is detachably attached to the end of a boom. As shown in FIG.
1, a swivel 52 is provided on the swivel 52. A boom 53 is mounted on the swivel 52 so as to be able to move up and down.
The boom 53 includes a plurality of boom members, which are telescopically configured to be telescopic.

A winch 54 is attached to the swivel table 52. A wire 55 extends from the winch 54 to the tip of the boom 53 and hangs downward from the tip of the boom. A hook 56 is attached to the tip of the wire 55. A hooking object (not shown) is hooked on the hook 56, and the wire 55 is wound by the winch 54 so that the lifting object can be hoisted. Has become.

This crane truck is not only used as a crane truck as described above, but also configured such that the workbench unit 30 is attached to the tip of the boom 53 so that work at a high place can be performed. For this reason, a pin hole 57 for detachably attaching the workbench unit 30 is formed at the tip of the boom 53. As shown in FIG.
The workbench unit 30 is provided with a connection member 31 for attachment and detachment, and the support member 5 is pivotally supported by the connection member 31. The lower end of the connection member 31 is formed in accordance with the tip shape of the boom 53, and is inserted into the tip of the boom 53. A pin hole 31a is also formed at this lower end, and the workbench unit 30 is fixed to the end of the boom 53 by inserting pins into these holes.

An operating device 9 is provided on the worktable 7 as in the first example. The operation signal output from the operating device 9 is wirelessly transmitted to a controller (not shown) on the vehicle body side using a transmitter on the workbench side and a receiver (both not shown) on the vehicle body side. Has become. An operation signal is output from the controller in accordance with the operation signal, and the boom 53 is turned, raised and lowered, or extended and contracted in accordance with the operation of the operation device 9. The configuration of each of the other members above the connection member 31 is the same as that of the first example, and the same members are denoted by the same reference numerals and description thereof will be omitted.

According to such a configuration, even when the operating device 9 is operated to operate the boom 53 in the crane truck, leveling for keeping the work table 7 horizontal is performed similarly to the first example. Can be.

In the first and second examples described above, when the prime mover 20b of the hydraulic pump unit 20 provided on the worktable 7 is constituted by an electric motor, it is necessary to operate the prime mover 20b. The electric power can be obtained from a battery provided on the vehicle body side of the crane truck. FIG. 5 shows a third example of such a configuration.
2 shows an example configuration. In this third example,
A work table 107 is attached so that the rear portion 107a is pivotally supported at the tip of the boom 53 and is swingable in the vertical direction. One end of the leveling cylinder 108 is
, And the other end is connected to the tip of the boom 53.

In the third example, an accumulator 32 is provided between the pump 20a and the solenoid valve 21a. When the leveling cylinder 108 is not operating, the accumulator 32 accumulates hydraulic oil from the pump 20a.
The operation 08 is performed using the hydraulic oil accumulated in the accumulator 32 in addition to the hydraulic oil from the hydraulic pump unit 20.

In this example, a swing angle detector 33a for detecting a swing angle α of the worktable 107 with respect to the boom 53 is provided.
And an undulation angle detector 33 for detecting the undulation angle β of the boom 53
b is provided. The detection signal from the undulation angle detector 33b is wirelessly transmitted from the transmitter 34b to the receiver 34a. The controller 21b receives the swing angle signal from the swing angle detector 33a and the undulation angle signal from the receiver 34a. Transmission of the undulation angle signal from the undulation angle detector 33b to the controller 21b may be performed using an electric wire.

An electric wire 35 extends from the motor 20b. The electric wire 35 is connected to an electric wire 38 via connectors 36 and 37, and electric power is supplied from the vehicle body side battery 58 to the motor 20b by the electric wires 35 and 38. Motor 20
b operates. The configuration of the other members of the crane truck is the same as that of the second example, and the same members are denoted by the same reference numerals and description thereof will be omitted.

In the third example having the above configuration, when the operating device 9 is operated to operate the boom 53, when the boom 53 is raised and lowered, the difference between the swing angle signal and the undulation angle signal becomes zero. An operation signal is output from the controller 21b to the solenoid valve 21a so that the expansion / contraction operation of the leveling cylinder 108 is controlled, and the swing of the work table 107 is adjusted so that the difference between the swing angle α and the undulation angle β becomes zero. The operation is controlled, and leveling for keeping the workbench 107 horizontal is performed.

In the third example, the leveling cylinder 10
The operation 8 can be performed using the hydraulic oil accumulated in the accumulator 32 in addition to the hydraulic oil from the hydraulic pump unit 20, so that the amount of hydraulic oil supplied from the pump 20a can be reduced. For this reason, the capacity of the pump 20a can be small, and the space for disposing the hydraulic pump unit 20 can be small.

In the third example, the electric power is obtained from the battery 58 on the vehicle body. However, a battery may be provided on the workbench 107 and the electric power may be obtained from this battery. FIG. 6 shows a configuration of a fourth example in such a configuration.

The motor 20b of the hydraulic pump unit 20
Is operated by electric power supplied from the upper battery 39 provided on the workbench 107. The controller 21
b, the motor 20 is provided in addition to the solenoid valve 21a.
An operation signal is also output to b.

The upper battery 39 can be charged by the electric power supplied from the vehicle body side battery 58 of the crane car, and a charger 40 is connected to the upper battery 39. An electric wire 35 extends from the charger 40. As in the third example, the electric wire 35 is connected to a connector 36,
37, and is connected to an electric wire 38.
As a result, electric power is supplied from the vehicle body-side battery 58 to the charger 40 via the lower charging unit 59, and the charger 40 converts the voltage to charge the upper battery 39. In addition, the lower charging unit 59 is provided with
In order to charge the battery 8, the crane truck is always provided, and thereby the power supply to the upper part is controlled so that the vehicle body side battery 58 does not become lower than a certain voltage. Since the configuration other than the above is the same as that of the third example, the same members are denoted by the same reference numerals and description thereof will be omitted.

In the fourth example having the above configuration, when the operating device 9 is operated and the boom 53 operates, the boom 53
Is detected from the detection signals from the swing angle detector 33a and the undulation angle detector 33b, an operation signal is output from the controller 21b, and the motor 39 operates. At the same time, an operation signal is output to the solenoid valve 21a, and the expansion and contraction operation of the leveling cylinder 108 is controlled as in the third example, and leveling for keeping the workbench 107 horizontal is performed. Note that the motor 20b may be configured to operate based on the output of the up / down signal during the up / down operation of the boom 53.

Although the case where the leveling cylinder is a hydraulic cylinder and the pump unit is a hydraulic pump unit has been described above, the leveling cylinder and the pump unit may be pneumatic. Instead of using the telescopic cylinder, an actuator such as a hydraulic motor that rotates by fluid pressure may be used. Further, an electric actuator may be used.

FIGS. 7 and 8 show the configuration of a fifth example in which an electric actuator is used. in this case,
The electric actuator 41 is provided at a rear portion 107 of the worktable 107.
a) is attached to the connection portion with the tip of the boom 53 in FIG. The electric actuator 41 includes a motor 41a and a speed reducer 41b having a high reduction ratio. Rear 1
07 a is attached to the end of the boom via the pin 42, and the rotation of the pin 42 with respect to the boom 53 is restricted.

The end of the pin 42 is connected to the output shaft of the speed reducer 41b. The rotating shaft of the motor 41a is coupled to the input shaft of the speed reducer 41b, and its main body is fixed to the rear portion 107a via the casing of the speed reducer 41b. The work table 107 swings by the rotation of the motor 41a. It has become. The reduction gear 41b has
For example, a harmonic drive mechanism can be used.

[0040]

As described above, the workbench leveling device of the present invention comprises a power source for supplying power to an actuator, and a tilt angle detector for detecting a tilt angle of the worktable from a horizontal plane in the swing direction. Since the work table is provided with a control device for controlling the operation of the actuator so that the tilt angle becomes zero based on a signal from the tilt angle detector, the operation of the actuator is performed by each component provided on the work table. By controlling the swinging motion of the worktable, leveling for keeping the posture horizontal can be performed.

When the actuator is composed of a fluid pressure actuator, the power source is composed of a pump unit, and the pump unit is composed of a pump and a motor for driving the pump, the capacity of the pump can be reduced by providing an accumulator. The space for disposing the pump unit is small.

Further, by providing the upper battery on the workbench, the motor can be operated by the electric power supplied from the upper battery, so that external power supply for operating the motor is not required. Further, by providing a connection means for connecting the lower power supply source and the upper battery provided on the vehicle body side of the work vehicle, the upper battery can be charged by the power supplied from the lower power supply source, and Therefore, there is no need to remove the upper battery.

It is to be noted that, in place of the tilt angle detector, a swing angle detector for detecting a swing angle of the worktable with respect to the boom is provided, and an elevation angle detector for detecting a boom angle is provided. Even if the operation of the actuator is controlled so that the difference between the angle signal from the swing angle detector and the angle signal from the undulation angle detector becomes zero, leveling can be performed similarly.

Further, a connecting member is detachably attached to the end of the boom, and a working table is attached to the connecting member so as to be vertically swingable, and an actuator is provided on the connecting member so that the working table can be always kept horizontal. With the configuration in which the work table is held, the work table can be attached to and detached from the end of the boom via the connection member in a state where the leveling device is provided. Also in this case, the leveling can be performed by operating and controlling the actuators by the respective components provided on the work table, so that it is almost unnecessary to change the work vehicle itself for the leveling.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a work bench leveling device of the present invention.

FIG. 2 is a side view showing the configuration of a first example of the aerial work vehicle having the leveling device of FIG. 1;

FIG. 3 is a diagram illustrating a second example of a mobile crane truck in which a worktable unit 30 including the leveling device of FIG. 1 is detachably attached to the end of a boom so as to be able to perform high-altitude work. FIG. 4 is a side view showing a state where the base unit 30 is attached.

FIG. 4 is a side view showing the configuration of the workbench unit 30 of FIG.

FIG. 5 is a side view showing a configuration of a third example in which the hydraulic pump unit is configured to be driven by a motor and electric power is obtained from a battery on the vehicle body side.

FIG. 6 is a side view showing a configuration of a fourth example in which the hydraulic pump unit is configured to be driven by a motor and power is obtained from a battery provided on a workbench.

FIG. 7 is a side view showing a configuration of a fifth example in a case where the work table is swung by an electric actuator in the configuration of FIG. 6;

FIG. 8 is a plan view taken along a line VIII in FIG. 7;

[Explanation of symbols]

3,53 Boom 7,107 Workbench 8,108 Leveling cylinder (fluid pressure actuator) 20, Hydraulic pump unit 21 Controller 22 Tilt angle detector 32 Accumulator 33a Swing angle detector 33b Raised angle detector 39 Upper battery 41 Electric Actuator

Continued on the front page (72) Inventor: Akihiko Ohira, 1152 Yamashita, Ryoji, Ryoke, Ageo City, Saitama Prefecture Inside Aichi Corp. Aichi Corporation Ageo Works (72) Inventor Ichikichi Honma 1152 Yamashita, Ryoke, Oyo-shi, Saitama 1010 Aichi Corporation Ageo Works

Claims (7)

[Claims] 1. A leveling device for a workbench, which is mounted at the end of a boom of a work vehicle so as to be swingable in a vertical direction, and which always holds a workbench for a worker to be horizontally held by an actuator. A power source, a tilt angle detector for detecting a tilt angle of the worktable from a horizontal plane in a swing direction, and operation of the actuator such that the tilt angle becomes zero based on a signal from the tilt angle detector. And a control device for controlling the work table is provided on the work table. 2. The apparatus according to claim 1, wherein the actuator comprises a fluid pressure actuator operated by a fluid pressure, and the power source comprises a pump unit, and the pump unit comprises a pump and a motor for driving the pump. Item 2. The worktable leveling device according to Item 1. 3. The worktable according to claim 2, wherein an accumulator for storing the pressure fluid supplied from the pump unit and supplying the stored pressure fluid to the fluid pressure actuator is provided on the work table. Table leveling equipment. 4. An upper battery provided on the workbench for supplying electric power to the motor, and a connection means for connecting a lower power supply source and the upper battery provided on a vehicle body side of the work vehicle, 4. The leveling device of claim 2, wherein the upper battery is charged with power supplied from the lower power supply. 5. 5. The leveling device according to claim 1, wherein the actuator comprises an electric actuator operated by electric power, and the power source comprises an upper battery for supplying electric power to the electric actuator. apparatus. 6. A swing angle detector for detecting a swing angle of the work table with respect to the boom, and an up / down angle detector for detecting an up / down angle of the boom, instead of the tilt angle detector. The control device controls the operation of the actuator based on signals from the swing angle detector and the undulation angle detector so that the difference between the sway angle and the undulation angle becomes zero. The leveling device for a worktable according to claim 1, wherein the leveling device comprises: 7. A connecting member is detachably attached to a tip end of the boom, and the working table is attached to the connecting member so as to swing vertically, and the actuator is provided on the connecting member. 7. The leveling device for a worktable according to claim 1, wherein the worktable is configured to be kept horizontally at all times.