JP3558113B2 - Control equipment for aerial work vehicles - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a control device for an aerial work vehicle having a workbench at a tip end of a boom which is mounted on a vehicle body so as to be able to move up, down, extend, and pivot.
[0002]
[Prior art]
A work table is provided at the tip of the boom that can be raised, contracted, and swiveled, and the boom can be operated to move the work table to a desired position so that workers on the work table can perform high-altitude work. Such an aerial work vehicle is generally known.
[0003]
Operating devices (upper operating device and lower operating device) for operating the boom are provided on the workbench and the vehicle body, respectively, and the operating lever provided on the operating device is manually operated by an operator. The workbench can be moved by raising and lowering, expanding and contracting, and turning the boom.
[0004]
In the case where the boom operation is performed from the upper operation device, the operation signal is not valid unless the operator operates the (upper) operation lever while pressing the foot switch, and the boom cannot be operated. It has become. Therefore, even if the operator moves the operating lever by mistake as if the user moved the body, the boom will not operate unless the foot switch is depressed.
[0005]
[Problems to be solved by the invention]
However, since the foot switch cannot always be provided in the lower operation device due to space or the like, there are many configurations in which the boom can be operated only by operating the (lower) operation lever. In the lower operating device having such a configuration, the boom operates even when the operating lever is accidentally moved, which is not preferable in terms of work safety. In addition, since the lower operation device can be easily accessed from the ground, an outsider such as a passerby may move the operation lever by mischief, and in such a case, the boom operates simply by moving the operation lever. That was not desirable either.
[0006]
The present invention has been made in view of such a problem, and in operating an operation of a boom from a lower operation device, without providing a foot switch, an operator accidentally moves an operation lever as if the body moved. It is an object of the present invention to provide a control device for an aerial work vehicle having a configuration in which a boom does not operate when an operation lever is mischievously moved by an outsider or the like.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a workbench for operator boarding is provided at a tip end of a boom that is mounted on a vehicle body so as to be able to undulate, expand, contract and rotate freely, and is provided on the vehicle body. A control device for the aerial work vehicle capable of operating the boom from the lower operating device provided and the upper operating device provided on the worktable is provided on the lower operating device and is manually operated to operate the boom. Lower boom operation means for receiving power supply from a power source, and outputting a lower operation signal for operating the boom in accordance with the operation of the lower boom operation means; and a lower operation device. A permission signal output means provided to output a permission signal only when manually operated, and an upper boom provided in the upper operation device and operated manually to operate the boom. The upper operation signal output means for receiving the power supply from the power supply, outputting an upper operation signal for operating the boom in accordance with the operation of the upper boom operation means, and the permission signal output means. Power supply switching means for supplying power from the power supply to the lower operation signal output means when the power is on, and supplying power from the power supply to the upper operation signal output means when the permission signal output means is not operated; and lower operation signal output means. Only when the lower operation signal output from the controller and the permission signal output from the permission signal output means are simultaneously input, the boom is operated in accordance with the lower operation signal, and the upper operation signal output from the upper operation signal output means is controlled. A controller that controls the operation of the boom according to the upper operation signal when a signal is input, a power supply, a power supply switching unit, A Department operation signal output means, and is configured by serially connected in this order controller.
[0008]
According to the control device having such a configuration, the controller is configured to perform control for operating the boom according to the lower operation signal only when the lower operation signal and the permission signal are input simultaneously. That is, the controller, when both the lower operation signal output by the operation permission signal and lower the boom operation means outputted by the operation of the permission signal output means is input, performs the operation of the boom in accordance with the lower operation signal . Thus upon the boom operation from the lower operating unit, since it requires an operation permission signal output means in addition to the operation of the lower boom operating means, moving the lower boom operating means accidentally impetus the operator moves the body If the permission signal output means is not operated even if the lower boom operating means is moved by mischief or an outsider mischiefs, the boom will not operate and safety is ensured.
[0009]
Further, the power supply, the power supply switching means, the lower operation signal output means, and the controller are connected in series in this order, and the power supply switching means receives power from the power supply only when the permission signal output means is operated. The power supply is supplied to the lower operation signal output means, and the power from the power supply is supplied to the lower operation signal output means only when the permission signal output means is operated, so that the permission signal output means is operated. If not, even if the boom operating means is operated, the operation signal itself is not output, and the safety is high.
[0010]
Furthermore, in the control device of the present invention, the operation of the boom can be performed from the upper operation device provided on the work table, and the upper operation device is provided on the upper operation device and is manually operated to operate the boom. Boom operation means, and upper power signal output means for receiving power supply from a power source and outputting an upper operation signal for performing an operation operation of the boom to the controller in accordance with the operation of the upper boom operation means, the controller comprising: When the upper operation signal is input, control is performed to operate the boom in accordance with the upper operation signal. When the permission signal output unit is not operated, the power supply switching unit outputs the power from the power supply to the upper operation signal. It is configured to be supplied to the output means. For this reason, when the permission signal output means is not operated, the power from the power supply is supplied to the upper operation signal output means, and the right to operate the boom is automatically given to the upper operation device side. Except when the operation of the boom is performed from the device, the operation of the boom can always be performed from the upper operation device, which is preferable in terms of work safety.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows an aerial work vehicle equipped with the control device of the present invention. The aerial work vehicle 1 has a swivel 12 which is rotatably mounted on a vehicle body 11. The swivel 12 has a boom 13 which has a plurality of nested boom members and is extendable. It is arranged up and down freely. The boom 13 is configured to perform a raising and lowering operation by a raising and lowering cylinder 21 and an expanding and contracting operation by a telescopic cylinder 22. A vertical post 15 which is always vertically held by a leveling mechanism is attached to the tip of the boom 13, and a worktable 14 for boarding the operator is swingable (horizontal swing) on the vertical post 15. Installed.
[0012]
As will be described later, operating devices for operating the boom 13 are provided on the work table 14 and the vehicle body 11, and these are operated to drive the up / down cylinder 21, the telescopic cylinder 22, and the turning motor 23. , Boom 13 can be operated. The elevation angle of the boom 13, the length of the boom 13, and the rotation angle of the swivel table 12 are respectively an elevation angle detector 31 provided at the base end of the boom 13 and a length detector 32 provided in the boom 13. , Are detected by a turning angle detector 33 provided below the turning table 12.
[0013]
A jack 17 that can extend downward and an outrigger 16 that can extend this to the side of the vehicle body 11 are provided at four front, rear, left, and right sides of the vehicle body 11. The vehicle body 11 can be fixed to the ground by protruding the outrigger 16 to the side and protruding the jack 17 downward to lift all the tires and lift the vehicle body 11. Here, each outrigger 16 can be extended in several stages, and can be set in accordance with the situation at the work site. The lateral extension operation of the outrigger 16 is performed by an outrigger operation device, and the extension operation of the jack 17 is performed by a jack operation device. Both of these operation devices are provided at the rear part of the vehicle body 11.
[0014]
An upper operation device 18 for operating the boom 13 by an operator who is on the work table 14 is provided on the work table 14. The upper operation device 18 includes an upper operation lever 24 that can be manually tilted and twisted, and a foot switch 25 that can be operated by the operator himself. The upper operation lever 24 is a lever of a neutral position automatic return type, and inputs an up / down / extension operation of the boom 13 by a tilt operation from the neutral position and a rotation operation input of the turntable 12 by a twist operation. The foot switch 25 is a switch that is turned on when a foot is depressed and turned off when the foot is released (when the foot is released, the foot switch automatically returns to a state before the foot is depressed).
[0015]
When operating the boom from the upper operation device 18, the operator first depresses and holds the foot switch 25, and in this state, tilts or twists the upper operation lever 24 to operate the boom 13 and the swivel base 12. Perform operation input. As a result, the operation signal of the boom 13 is output, and the controller 34 determines the drive amounts of the up-and-down cylinder 21, the telescopic cylinder 22, and the turning motor 23 according to the operation signal, drives them, and operates the boom 13 ( (See FIG. 1).
[0016]
At the base end of the boom 13 on the vehicle body 11, a lower operation device 19 for the ground operator to operate the boom 13 from above the vehicle body 11 is provided. The lower operating device 19 includes a lower operating lever 26 (corresponding to a boom operating unit in the claims) that can be manually tilted and twisted, and a lower priority lever 27 that can be manually tilted (in the claims). (Corresponding to permission signal output means). As shown in FIG. 3, the lower operation lever 26 is a stick lever of a neutral position automatic return type. (The upper operation lever 24 has the same configuration). The lower priority lever 27 is a lever of a neutral position automatic return type. The lower priority lever 27 is turned on when the tilting operation is manually performed from the neutral position, and turned off when the hand is released.
[0017]
When operating the boom 13 from the lower operation device 19, the operator first tilts and holds the lower priority lever 27 with one hand, and in this state, tilts or twists the lower operation lever 26 to operate the boom 13. The operation input of the turntable 13 and the turntable 12 is performed. As a result, an operation signal of the boom 13 is output, and the controller 34 determines the drive amounts of the up-and-down cylinder 21, the telescopic cylinder 22, and the turning motor 23 according to the operation signal and drives them to operate the boom 13.
[0018]
Next, a signal path for operating the boom 13 from the upper operation device 18 and the lower operation device 19 will be described with reference to FIG. An upper operation signal output device 37 (corresponding to the upper operation signal output means in the claims) that outputs the operation signal of the boom 13 to the controller 34 in response to the operation of the above-described upper operation lever 24 is provided with a changeover switch 36 (in the claims). (Corresponding to a power supply switching means of the range) and a foot switch 25 and a power supply 35. In addition, a lower operation signal output device 38 (corresponding to a lower operation signal output unit in the claims) that outputs an operation signal of the boom 13 to the controller 34 in response to the operation of the lower operation lever 26 is connected to a power supply 35 via a changeover switch 36. Is connected to The lower operation signal output device 38 has a switch 38a for driving the up / down cylinder 21, a switch 38b for driving the telescopic cylinder, and a switch 38c for driving the turning motor (the same applies to the upper operation signal output device 37). The controller 34 drives the actuators (the up / down cylinder 21, the telescopic cylinder 22, and the turning motor 23) according to the operation signal of the boom 13 output from the upper operation signal output device 37 or the lower operation signal output device 38.
[0019]
The changeover switch 36 is normally switched to the side where the power from the power supply 35 is supplied to the upper operation signal output device 37 (the signal path 41 side), and operates the lower priority lever 27 provided in the lower operation device 19. The switch is switched to the side where the power from the power supply 35 is supplied to the lower operation signal output device 38 (the signal path 42 side) only when the power is turned off. Therefore, normally (when the lower priority lever 27 is not operated), only the operation of the boom 13 from the upper operation device 18 is possible, and only when the lower priority lever 27 is operated, the operation of the lower operation device 19 is performed. The boom 13 can be operated.
[0020]
When the lower priority lever 27 is operated, a signal (permission signal) for permitting the operation of the boom 13 by operating the lower operation lever 26 is output to the lower operation signal output device 38 (path from the signal paths 42 to 43), and The power from the power supply 35 is supplied to the lower operation output device 38, and the operation signal of the boom 13 can be output from the lower operation signal output device 38. That is, the controller 34 controls the operation of operating the boom 13 when both the permission signal output by operating the lower priority lever 27 and the operation signal output from the lower operation device 19 are input. Do.
[0021]
Here, as shown in FIG. 1, the permission signal output by operating the lower priority lever 27 is directly output to the controller 34 in addition to the path (signal path 43) output to the lower operation device 38. A signal path (signal path 44) is provided, and the controller 34 receives both the direct output permission signal (the permission signal passing through the signal path 44) and the operation signal output from the lower operation signal output device 38. At this time, control for operating the boom 13 may be performed.
[0022]
As described above, even if the lower operation lever 26 is operated, the boom 13 does not operate unless the lower priority lever 27 is operated. Even if the lower operating lever 26 has been moved or the outsider has moved the lower operation lever 26 by mischief, the boom 13 will not operate unless the lower priority lever 27 is operated, which is safe.
[0023]
Although the switching operation of the changeover switch 36 is performed by the lower priority lever 27 in the above embodiment, a manual button or the like may be used instead of such a lever. At this time, it is preferable that the manual button be turned on only when the finger is pressed, and turned off when the finger is released.
[0024]
【The invention's effect】
As described above, according to the control device for an aerial work vehicle according to the present invention, the lower operation device is provided with the boom operation means for manually operating the boom operation and the permission signal output means which is manually operated. When the controller receives both the permission signal output by the operation of the permission signal output means and the operation signal output by the operation of the boom operation means, the controller operates the boom according to the operation signal. Even if the worker accidentally moves the boom operation input means as if the body has moved, or if an outsider moves the boom operation input means by mischief, unless the permission signal output means is operated The boom is inactive and safe.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a control device of the present invention.
FIG. 2 is a perspective view of an aerial work vehicle having the control device of the present invention.
FIG. 3 is a perspective view illustrating a configuration of a lower operation device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Aerial work vehicle 13 Boom 19 Lower operation device 26 Lower operation lever 27 Lower priority lever 34 Controller 35 Power supply 36 Changeover switch 38 Lower operation signal output device

Claims (1)

A workbench for boarding an operator is disposed at the tip of a boom that is freely undulated , extended , retracted , and pivoted on the vehicle body, and is provided on the lower operation device provided on the vehicle body and the worktable. A control device for an aerial work vehicle capable of operating the boom from an upper operation device ,
A lower boom operating means provided on the lower operating device and manually operated to perform an operation operation of the boom;
A lower operation signal output unit that receives power supply from a power supply and outputs a lower operation signal for performing an operation operation of the boom in accordance with an operation of the lower boom operation unit;
Permission signal output means provided in the lower operation device and outputting a permission signal only when manually operated,
An upper boom operating means provided on the upper operating device and manually operated, and for performing an operation operation of the boom,
An upper operation signal output unit that receives power supply from the power supply and outputs an upper operation signal for performing an operation operation of the boom in accordance with an operation of the upper boom operation unit,
When the permission signal output means is operated, the power from the power supply is supplied to the lower operation signal output means. When the permission signal output means is not operated, the power from the power supply is supplied to the upper operation signal output means. Power supply switching means to be supplied,
Performing control to operate the boom according to the lower operation signal only when the lower operation signal output from the lower operation signal output means and the permission signal output from the permission signal output means are simultaneously input, A controller that controls the operation of the boom according to the upper operation signal when the upper operation signal output from the upper operation signal output unit is input;
A control device for a high work vehicle , wherein the power supply, the power supply switching means, the lower operation signal output means, and the controller are connected in series in this order .

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