JP3561604B2 - Boom operation control device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an operation control device for a boom provided on an aerial work vehicle or the like, and furthermore, a body of an operator who rides on a work table provided at a tip portion of the boom is prevented from becoming unstable. The present invention relates to a boom operation control device that controls operation of a boom.
[0002]
[Prior art]
In an aerial work vehicle equipped with a telescopic, undulating, and swiveling boom on the vehicle body and a worktable on which the worker can mount at the tip of this boom, the operator appropriately controls the operating device provided on the worktable. The work table is moved to a desired high place by operating the boom to extend, retract, raise and lower, and perform a work at a high place.
[0003]
In such an aerial work vehicle, an operation device for performing each operation of the boom is configured by an operation lever provided according to each operation. Here, depending on the contents of the work at a high place, it may be necessary to move the work table horizontally in the front-rear direction or vertically in the vertical direction. Such a movement of the worktable is performed by simultaneously operating a plurality of operation levers. However, performing such an operation requires skill, and operation efficiency by an unskilled operator is reduced. .
[0004]
For this reason, in an aerial work vehicle, a mode changeover switch is provided separately from each operation lever in order to improve work efficiency at the time of work involving such movement of the workbench. When the mode is switched to the movement mode, the work platform can be moved horizontally in the front-rear direction or vertically up and down by operating only one operation lever. , Automatically).
[0005]
For example, when the mode changeover switch is switched to the normal mode, only the extension / retraction operation of the boom is performed by operating the extendable lever, and when the mode changeover switch is switched to the horizontal / vertical movement mode, the telescopic operation is performed. By operating the lever, not only the extension / retraction operation of the boom but also the up / down operation is performed, and the work table is moved horizontally in the front-rear direction.
[0006]
[Problems to be solved by the invention]
However, in the case of such a configuration, when the mode changeover switch is operated during the operation of the boom, the body of the worker riding on the worktable shakes because the moving direction of the worktable changes suddenly. There was a problem of instability. For example, if the mode is switched to the normal mode while the workbench is horizontally moved backward by performing the contraction operation of the telescopic lever in the horizontal / vertical movement mode, the workbench moves diagonally downward.
[0007]
The present invention has been made in view of such a problem, and in an aerial work vehicle configured to be able to perform horizontal and vertical movements of a worktable with a simple operation, the worktable suddenly moves. An object of the present invention is to provide a boom operation control device that prevents an operation of a boom that makes the body of an operator who is on a work table unstable without changing the direction.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a boom operation control device according to the present invention includes a worktable at a tip end thereof, and controls the operation of a boom that is mounted on a vehicle body so as to be undulated and extendable. Means, undulating operation means, mode switching means, a controller, and mode switching control means.
[0009]
The expansion / contraction operation unit and the up / down operation unit transmit an expansion / contraction operation signal for performing the extension / retraction operation of the boom and an up / down operation signal for performing the up / down operation, and the mode switching unit includes a normal mode and a horizontal / vertical movement mode. Switch the boom operation mode.
[0010]
When the boom operation mode is switched to the normal mode by the switching operation of the mode switching unit, the controller causes the boom to expand and contract based on the telescopic operation signal from the telescopic operation unit, and performs the raising and lowering operation from the raising and lowering operation unit. Raise and lower the boom based on the signal. Further, when the mode is switched to the horizontal / vertical movement mode, the operation is performed by performing the extension / retraction operation of the boom based on one of the extension / reduction operation signal from the extension / contraction operation unit and the undulation operation signal from the undulation operation unit. The table is moved horizontally, and the work table is moved vertically by performing the extension / retraction operation and the up / down operation of the boom based on the other operation signal.
[0011]
The mode switching control means restricts the operation of the boom when the mode switching means is operated while the boom is being operated by operating the expansion / contraction operation means or the up / down operation means. Then, the switching of the boom operation mode based on the switching operation of the mode switching unit is permitted only when the operation of each operation unit is not performed.
[0012]
According to the boom operation control device configured as described above, even when one operation unit is operated in the same direction, the moving direction of the worktable varies depending on the boom operation mode. However, while operating the operating means to move the platform in a specific direction, even when attempting to switch the boom operation mode, the platform is moved to its position without suddenly changing the moving direction of the platform. To stop. When the direction of movement of the workbench is to be changed by switching the boom operation mode, it is considered that the operation of the operating means, which is a state in which the operation of the boom is stopped, is not performed.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration of a self-propelled aerial work vehicle 1 including a boom operation control device according to the present invention. The aerial work vehicle 1 has a turntable 12 that can be turned on a vehicle body 11 by a turn motor 13. The turntable 12 is nested from a base boom 14 a, an intermediate boom 14 b, and a tip boom 14 c. A boom 14 configured to be extendable and retractable is attached to be able to undulate.
[0014]
The boom 14 is raised and lowered by a raising and lowering cylinder 15 and is expanded and contracted by a telescopic cylinder 16. A vertical post 17 which is always held vertically by a leveling mechanism (not shown) is attached to the distal end of the distal end boom 14c. Is mounted to swing freely.
[0015]
The worktable 18 is provided with an operation device 20 as also shown in FIGS. The operating device 20 includes a telescopic / up / down operating lever (expanding / lowering operating means) 21, a turning operation lever 22, and a mode switching switch (mode switching means) 23. The mode switch 23 is configured to be capable of switching between a boom operation mode including a normal mode and a horizontal / vertical movement mode, as described in detail later.
[0016]
The telescopic / undulating operation lever 21 is configured to be capable of falling down in the left-right direction and the front-back direction from the neutral position shown in FIG. 3, and the turning operation lever 22 is configured to be capable of falling down in the left-right direction. An operation signal is transmitted to the controller 25 by performing the falling operation in each direction. When the operation levers 21 and 22 are in the neutral position (the state in which the tilting operation is not performed in any direction), the operation signal is not transmitted to the controller 25.
[0017]
In a state where the mode changeover switch 23 is switched to the normal mode, the operation of the boom 14 according to the operation of each of the levers 21 and 22 is performed. That is, by operating the telescopic / undulating operating lever 21 in the left-right direction, a telescopic operation signal is sent to the telescopic cylinder 16 via the controller 25, and the telescopic operation of the boom 14 is controlled as shown in FIG. . Further, by operating the telescopic / up / down operation lever 21 in the front-back direction, an up / down operation signal is sent to the up / down cylinder 15, and the up / down operation control of the boom 14 is performed as shown in FIG. Further, by operating the turning operation lever 22 in the left-right direction, a turning operation signal is sent to the turning motor 13 and the turning operation of the boom 14 is controlled.
[0018]
Therefore, if an operator (not shown) boarding the worktable 18 operates the operation device 20, the workbench 18 can be moved to a desired height by operating the boom 14 to extend, retract, and turn. it can. Then, for example, when working while moving the worktable 18 horizontally or vertically, such as when working while moving back and forth with respect to the ceiling, or when working while moving up and down with respect to a wall surface, Switches the mode changeover switch 23 to the horizontal / vertical movement mode.
[0019]
When the mode changeover switch 23 is switched to the horizontal / vertical movement mode, the telescopic operation signal is transmitted by operating the telescopic / up / down operating lever 21 in the left-right direction. In addition, not only the telescopic operation signal is transmitted to the telescopic cylinder 16, but also the undulating operation signal is transmitted to the undulating cylinder 15, so that not only the telescopic operation of the boom 14 but also the undulating operation is performed. In this case, the operation amounts of the telescopic cylinder 16 and the undulating cylinder 15 are determined in advance according to the telescopic amount and the undulating angle of the boom 14 so that the work table 18 moves horizontally in the front-rear direction.
[0020]
For example, when the contraction operation of the telescopic / up / down operation lever 21 is performed in the horizontal / vertical movement mode, the controller 25 performs the raising operation together with the reduction operation of the boom 14 as shown in FIG. Let it do. As a result, the workbench 18 horizontally moves rearward along the horizontal plane H, which is the position of the workbench 18 when the operation of the telescopic / up / down operation lever 21 is performed.
[0021]
When the up / down operation of the telescopic / up / down operation lever 21 is performed in a state where the mode changeover switch 23 is switched to the horizontal / vertical movement mode, the controller 25 moves the boom 14 as shown in FIG. The work table 18 is vertically moved along the vertical plane V which is the position of the work table 18 when the operation of the expansion / contraction operation lever 21 is performed.
[0022]
The controller 25 is provided with a mode switching control device (mode switching control means) 26. The mode switching control device 26 controls the operation of the operation levers 21 and 22. When the mode switching operation of the mode switching switch 23 is performed, the mode switching control device 26 controls the boom operation of the telescopic cylinder 16, the up-and-down cylinder 15, and the like. The transmission of the telescopic operation signal and the up / down operation signal to each actuator is cut off, and the operation of the boom 14 is stopped in a state where the operation is performed. This control is performed regardless of whether the mode switch 23 is switched to the normal mode or the horizontal / vertical movement mode.
[0023]
Further, the mode switching restricting device 26 prevents the operation mode from being switched even when the mode switching operation of the mode switching switch 24 is performed while the operation levers 21 and 22 are being operated. The mode switching operation based on the switching operation is permitted only when each of the operation levers 21 and 22 is at the neutral position.
[0024]
That is, for example, when the boom operation mode is the normal mode, the mode changeover switch 23 is turned on when the telescopic / up / down operation lever 21 is operated to reduce the boom 14 as shown in FIG. When the mode is switched to the horizontal / vertical movement mode, the workbench 18 stops at that position, and the horizontal movement backward as shown in FIG.
[0025]
Therefore, when it becomes necessary to horizontally move the work table 18 backward while the boom 14 is being contracted, first, the telescopic / up / down operating lever 21 is returned to the neutral position, and the boom 14 is moved. The reduction operation is stopped, or the changeover switch 24 is switched to the horizontal / vertical movement mode while the reduction operation of the expansion / lowering operation lever 21 is being performed, and the reduction operation of the boom 14 is stopped.
[0026]
Next, if the telescopic / up / down operating lever 21 is kept at the neutral position, or if the changeover switch 23 has already been switched to the horizontal / vertical movement mode, the telescopic / up / down operating lever 21 is returned to the neutral position once. In this state, the extension / relief operation lever 21 is not operated. After that, the extension / retraction operation lever 21 is again contracted to horizontally move the worktable 18 rearward.
[0027]
As described above, when switching the boom operation mode from the normal mode to the horizontal / vertical movement mode or vice versa, the operator switches the boom operation mode when switching from the horizontal / vertical movement mode to the normal mode. The worktable 18 is in a stopped state regardless of whether or not the work table 18 is recognized.
[0028]
In the aerial work vehicle 1 described above, when the boom operation mode is switched to the horizontal / vertical movement mode, the work table 18 is moved horizontally by operating the telescopic / up / down operation lever 21 in the left / right direction. The work table 18 is vertically moved by operating the telescopic / up / down operating lever 21 in the front-rear direction. However, the present invention is not limited to this. The work table 18 may be configured to move vertically by operating in the direction, and the work table 18 may be configured to move horizontally by operating the expansion / contraction / raising / lowering operation lever 21 in the front-rear direction.
[0029]
Further, the aerial work vehicle 1 is configured to be capable of turning the boom 14 by operating the turning lever 22. Then, in the state where the boom operation mode is switched to the horizontal / vertical movement mode, the horizontal / vertical movement of the worktable 18 in a plan view is performed by operating the turning operation lever 22 in conjunction with the operation of the telescopic / up / down operation lever 21. So that you can do it. However, in the present invention, the boom 14 does not necessarily need to be configured to be freely rotatable, and it is sufficient that at least the boom 14 is configured to be capable of extending and retracting and undulating.
[0030]
【The invention's effect】
As described above, the boom operation control device of the present invention regulates the operation of the boom when the mode switching unit is switched while the telescopic operation unit or the up / down operation unit is being operated. Only when the operation of the means is not performed, the switching of the boom operation mode based on the switching operation of the mode switching means is permitted. As a result, while the operating table is being moved in a specific direction by operating the operating means, even if the boom operation mode is switched by the mode switching means, the working direction of the operating table does not suddenly change. Since the stand stops at that position, when the operator performs an erroneous operation to switch the mode switching means, the erroneous operation can be easily recognized.
[0031]
In addition, even when the worker intentionally performs the switching operation of the mode switching means, when the boom operation mode is switched to change the moving direction of the work table, the operation of the boom is stopped. The operation of the boom must be temporarily stopped when the moving direction of the workbench changes because the operation state is regarded as not being operated by the operating means. For this reason, the worker who boarded the work table can check the moving direction of the work table and can prepare for the movement, so that the body does not become unstable in the work table during the movement.
[Brief description of the drawings]
FIG. 1 is a side view of an aerial work vehicle equipped with a boom operation control device according to the present invention.
FIG. 2 is a side view of the aerial work vehicle.
FIG. 3 is a perspective view showing an operation device provided on a work table of the aerial work vehicle.
FIG. 4 is a block diagram of the boom operation control device.
[Explanation of symbols]
1 Aerial work platform 14 Boom 18 Work table 21 Telescopic / up / down operating lever (telescopic operating device, up / down operating device)
22 turning operation lever 23 mode changeover switch (mode changeover means)

Claims (1)

A boom that has a worktable at the tip and is undulated and extendable on the car body,
Telescopic operation means for transmitting a telescopic operation signal for performing the telescopic operation of the boom,
Up / down operation means for transmitting an up / down operation signal for performing the up / down operation of the boom,
Mode switching means for switching between a boom operation mode including a normal mode and a horizontal / vertical movement mode;
When the mode switching unit is switched to the normal mode, the boom is extended and retracted based on the telescopic operation signal from the telescopic operating unit, and the boom is extended and retracted based on the undulating operation signal from the undulating operation unit. When the mode switching means is switched to the horizontal / vertical movement mode, one operation signal of the telescopic operation signal from the telescopic operation means and the undulation operation signal from the undulation operation means is performed. A controller that performs the telescopic operation and the up-and-down operation of the boom based on the horizontal movement of the work table, and performs the telescopic operation and the up-and-down operation of the boom based on the other operation signal to vertically move the work table. ,
When a switching operation of the mode switching means is performed while the operation of each of the operation means is performed, the operation of the boom is restricted, and only when the operation of each of the operation means is not performed, A boom operation control device comprising mode switching control means for permitting switching of the boom operation mode based on a switching operation.

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