JP3566875B2 - Body support device for aerial work vehicles - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a body support device for an aerial work vehicle, and more particularly, to a body support device for an aerial work vehicle that stably supports a vehicle body by manually or automatically operating an outrigger and a jack.
[0002]
[Prior art]
A work vehicle equipped with a boom that can move up and down freely on the vehicle body, such as an aerial work vehicle and a crane vehicle, includes an outrigger that is laterally extended from the vehicle body on each side of the front and rear of the vehicle body and is stowable, And a jack provided at the distal end of the outrigger so as to be able to expand and contract. Hereinafter, these are collectively referred to as outrigger jacks. By projecting the outrigger to the side of the vehicle body and grounding the lower end of the jack, a stability against a moment acting in the direction of overturning the vehicle body due to its own weight or tip load (hereinafter, referred to as “overturning moment”). Is obtained. Such an outrigger and a jack are configured so that they can be individually extended, stored, and grounded by operating an operating device provided for each of the outrigger and the jack.
[0003]
In addition, the aerial work vehicle has an outrigger jack automatic storage device (hereinafter, referred to as "automatic storage device") that can automatically perform an operation of storing the grounded outrigger jack in the vehicle body with one switch. There are also things. By using this automatic storage device, the storage time can be greatly reduced, and the work efficiency can be improved.
[0004]
[Problems to be solved by the invention]
However, since the manual operation of the outrigger and the jack is performed by a separately provided operating device, simultaneous operation of the outrigger and the jack is possible. Therefore, if the outrigger is extended or stored while the jack tip is grounded, there is a risk that the road surface may be damaged or the jack attachment portion may be deformed.
[0005]
When the outrigger jack is automatically stored in the vehicle body, the time required for storage is set by a timer, and when the outrigger and jack are stored within this set time, the outrigger jack is stored in a shorter time than the set time. Even when the operation is completed, the hydraulic motor, which is a supply source of the hydraulic oil supplied to the outrigger and the jack, continues to rotate without stopping. Therefore, electric power for rotating the hydraulic motor is wasted. Even if the storage is not completed within the predetermined time, the storage operation of the outrigger jack stops after the predetermined time elapses, but it can be operated by operating the automatic storage device again. However, if the storage is not completed within the predetermined time, it is considered that some kind of abnormal situation has occurred. Therefore, if the automatic storage device is operated in this state, the problem that the discovery of the abnormal situation is delayed is caused. .
[0006]
The present invention has been made in view of such a problem, and does not damage the jack tip or the road surface when the outrigger jack is manually stored, and wastes power in the storage operation of the outrigger jack in automatic storage. It is an object of the present invention to provide a body support device for an aerial work vehicle that can prevent the abnormal situation and detect an abnormal situation early.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a body support device for an aerial work vehicle according to the present invention is provided with a plurality of outriggers which are provided so as to protrude to the left and right sides before and after the vehicle body and are freely retractable, and at each end of the plurality of outriggers. A jack which extends downward and is provided so as to be retractable, extends the outrigger to the side of the vehicle body, extends the jack, and grounds the tip of the jack to support the vehicle body. The body support device of the aerial work vehicle includes an outrigger operation operating means (for example, the outrigger operation switch 47 in the embodiment) for manually operating the outrigger extension / retraction operation, and a jack operation operation for manually operating the jack extension / retraction operation. Means (eg, jack operation switch 43 in the embodiment), jack state detection means (eg, jack state detection sensor 51 in the embodiment) for detecting the grounding and storage state of the jack, and operation information based on outrigger operation operation means. The operation of the outrigger operation control means (for example, the operation control circuit 61 in the embodiment) that controls the operation of the outrigger and controls the operation of the jack based on the operation information from the jack operation control means, and the operation of the outrigger operation control means are performed. If the jack status detection means is in the jack storage state When not detected, the electrically regulate the operation of the outrigger Thereby restricting the jack tip from dragging on the road surface. It is preferable to have an operation control means (for example, the operation restriction circuit 63 in the embodiment).
[0008]
In order to extend and retract the outrigger and the jack, the outrigger operating means and the jack operating means are operated. Operation information from these The operation control means operates the outrigger and the jack based on the above, and the outrigger and the jack are extended and stored.
[0009]
However, if the jack state detection means does not detect the storage state of the jack when the outrigger operation operation means is operated, the operation of the outrigger is performed. Electrically regulate. Therefore, by restricting the operation of the outrigger when the jack is not in the retracted state when the outrigger is stored, the jack tip is dragged on the road surface, thereby preventing damage to the road surface and the jack tip. Can be.
[0010]
An automatic storage switch (for example, the automatic operation switch 49 in the embodiment) that is operated when the outrigger and the jack are automatically stored in the vehicle body, and an outrigger state detection unit (for example, in the embodiment) that detects the extension and storage state of the outrigger. An outrigger state detection sensor 53), the operation control means reduces the size of the jack when the automatic storage switch is operated, stores the jack, and activates the outrigger when the jack state detection means detects the storage state of the jack. It is preferable that the outriggers are moved to the vehicle side and stored, and the automatic storage of the outriggers and the jacks is terminated when the outrigger state detection means detects the stored state of all the outriggers.
[0011]
To automatically store the outrigger and jack in the vehicle body, first connect the automatic storage switch. When the automatic storage switch is operated, the operation control means causes the jack to contract and store the jack, and when the jack state detecting means detects the storage state of the jack, the outrigger is moved to the vehicle body side to be stored. Then, when the outrigger state detecting means detects the storage state of all outriggers, the automatic storage of the outrigger and the jack ends. In order to store the outrigger in the vehicle body, the jack must be stored in the outrigger. Therefore, the outrigger does not contract when the jack is not stored. For this reason, it is possible to prevent the jack from contacting an obstacle or the like.
[0012]
When all jacks are detected to be in the retracted state by the jack state detecting means, and when all outriggers are detected to be in the retracted state by the outrigger state detecting means, the operation control means determines whether the outrigger is in the retracted state. It is preferable to terminate the automatic storage of the outrigger and the jack by omitting the above.
[0013]
If all the outriggers are stored in the vehicle body when the jack is in the stored state, the process of storing the outriggers is omitted. For this reason, it is possible to save electric power for operating the drive source necessary for storing the outrigger.
[0014]
If, after operating the automatic storage switch, at least one of the jack state detection means and the outrigger state detection means does not detect the operation within a predetermined time from when the automatic storage switch is operated or the detected value does not change, the operation is performed. The restriction means may perform at least one of the operation restriction and the warning operation of the outrigger and the jack.
[0015]
If at least one of the jack state detection means and the outrigger state detection means does not detect the operation or the detected value does not change after operating the automatic storage switch, some abnormal state occurs in the jack, outrigger, detection means, etc. The operation restricting means performs at least one of the operation restriction of the outrigger and the jack and the warning operation. For this reason, abnormalities of the outrigger, the jack, the drive source for operating the outrigger, the jack, and the like can be found early.
[0016]
It has an automatic extension switch (for example, the automatic operation switch 49 in the embodiment) that is operated when the outrigger and the jack are automatically extended from the vehicle body. When the automatic extension switch is operated, the operation control means moves the outrigger to the vehicle body. After overhanging the jack, the jack may be extended downward to ground the tip of the jack so that the automatic overhang is completed.
[0017]
By operating the automatic extension switch, the outrigger jack can be automatically extended, and the extension operation can be simplified and the extension time can be reduced.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. This embodiment shows an aspect of an aerial work vehicle having a telescoping boom that can move up and down and swing freely on a vehicle body. First, an aerial work vehicle equipped with the vehicle body support device of the present invention will be described. As shown in FIG. 1, the aerial work vehicle 1 is configured based on a truck, has a driving cabin 5 in front of a vehicle body 3, and has driving wheels 7 on left and right sides of the driving cabin 5 and a rear part of the vehicle body 3. Are arranged. A turning table 9 is provided at the rear of the vehicle body 3 so as to project upward and freely turn. A turning motor 11 is provided inside the vehicle body 3, and the turning table 9 is configured to be able to turn by the operation of the turning motor 11. A telescopic boom 13 is pivotally connected to the upper part of the swivel base 9, and the telescopic boom 13 is configured to be capable of telescopic movement by a telescopic operation of a telescopic cylinder 15 built in the telescopic boom 13. An up-and-down cylinder 17 is pivotably connected between the base of the telescopic boom 13 and the bottom of the swivel table 9 so that the telescopic boom 13 is raised and lowered by the telescopic operation of the up-and-down cylinder 17. .
[0019]
A vertical post 19 is provided at the distal end of the telescopic boom 13 so as to be vertically swingable. A work table 21 on which an operator can ride is attached to the vertical post 19 so as to be pivotable. Here, the vertical post 19 is connected to a leveling device (not shown), and is always held in a vertical state irrespective of the up-and-down angle of the telescopic boom 13. For this reason, the work table 21 can always perform a turning operation in a horizontal plane.
[0020]
A boom operating section 23 is provided on each of the side section of the swivel table 9 and the work table 21. By manually operating an operation lever L provided on these boom operation sections 23, the swivel motor 11, the up-and-down cylinder 17 By operating the operation of the telescopic cylinder 15 and the telescopic boom 13, the workbench 21 can be moved to a desired high position by raising and lowering, expanding and contracting, and turning.
[0021]
Next, the vehicle body support device will be described. The vehicle body support device 30 has outrigger jacks 31 arranged at four positions in front, rear, left and right of the vehicle body 3. The outrigger jack 31 has an outrigger 33 provided so as to be able to protrude from the vehicle body 3 to the side, and a jack 35 provided at the distal end of the outrigger 33 so as to be able to extend downward. An outrigger 33 is built in the outrigger 33, and the outrigger 33 can be extended from the vehicle body 3 and retracted by expanding and contracting the overhang cylinder 37.
[0022]
The jack 35 has an outer post 35a attached to the distal end of the outrigger 33, and an inner post 35b that is extendable with respect to the outer post 35a. A ground plate 35c is attached to the lower end of the inner post 35b. A grounding cylinder 39 is built in the inner post 35b, and by extending and contracting the grounding cylinder 39, the inner post 35b is extended and contracted to ground the ground plate 35c, and the inner post 35b is connected to the outer post 35a. Can be stored.
[0023]
FIG. 2 is a view showing the rear part of the vehicle body 3. As shown in FIG. 2, an operation plate 41 which is a part of the vehicle body support device 30 and operates the outrigger jack 31 is provided on the left side of the rear part of the vehicle body 3. Is provided. As shown in FIGS. 1 and 3, the operation plate 41 includes a jack operation switch 43 for individually extending and retracting the four jacks 35 disposed on the left and right sides of the vehicle body 3, and a state where each jack 35 is in a ground state. When the outrigger jack 31 is automatically extended and retracted, a grounding lamp 45 illuminated when it is turned on, an outrigger operation switch 47 for individually extending and retracting each of the four outriggers 33 disposed on the left and right sides of the vehicle body 3. And an automatic operation switch 49 operated by the user.
[0024]
The jack operation switch 43 has a switch portion 43a projecting rearward of the vehicle (perpendicular direction of FIG. 3) and capable of swinging up and down, and setting the switch portion 43a to a neutral state (a state perpendicular to the plane of FIG. 3). ), An operation signal for contracting the jack 35 is transmitted. When the switch unit 43a is lowered from the neutral state, an operation signal for extending the jack 35 is transmitted. When the switch unit 43a is set to the neutral state, the jack is transmitted. The operation switch 43a is kept in the cut-off state, and the output of the operation signal is stopped. For this reason, when the switch portion 43a that is tilted up or down is set to the neutral state, the operation of the jack 35 can be stopped. The ground lamp 45 disposed below each jack operation switch 43 is lit when the jack 35 is grounded, and this lighting allows the worker to confirm the grounding of the jack 35.
[0025]
The outrigger operation switch 47 has a switch portion 47a projecting rearward of the vehicle and swinging up and down. When the switch portion 47a is tilted upward from a neutral state (a state perpendicular to the plane of FIG. 3), the outer post 35a is moved. When the switch portion 47a is tilted downward from the neutral state, an operation signal for operating the outer post 35a in a direction extending from the vehicle body 3 is transmitted, and the switch that is tilted up or down is transmitted. When the portion 47a is set in the neutral state, the operation of the outrigger 33 stops.
[0026]
The automatic operation switch 49 has a switch portion 49a projecting rearward of the vehicle and swinging up and down. When the switch portion 49a is tilted upward from a neutral state (a state perpendicular to the plane of FIG. 3), four switches are provided. When all the outrigger jacks 31 transmit a storage signal for automatically storing the outrigger jacks 31 in the vehicle body 3 and the switch portion 49a is tilted downward from the neutral state, all four outrigger jacks 31 protrude from the vehicle body 3 and the jack tip ends. When the switch portion 49a that is tilted up or down is set to a neutral state, the automatic operation of the outrigger jack 31 is released (stopped). That is, the automatic operation switch 49 outputs a storage signal of the outrigger jack 31 when the switch portion 49a is tilted upward, and outputs an outrigger jack extension signal when the switch portion 49a is tilted downward.
[0027]
FIG. 4 is a block diagram of the vehicle body support device 30. As shown in FIG. 4, the vehicle body support device 30 includes a grounding of each jack 35 in addition to the automatic operation switch 49, the jack operation switch 43, and the outrigger operation switch 47 described above. And a jack state detection sensor 51 for detecting the storage state. The jack state detection sensor 51 outputs a ground signal and a storage signal when each jack 35 is in the ground and stored state. Further, the vehicle body support device 30 has an outrigger state detection sensor 53 that outputs an overhang signal and a storage signal when the outrigger 33 is in the overhanging and retracted state. The outrigger state detection sensor 53 outputs an overhang signal and a storage signal when each outrigger 33 is in the overhang and storage state.
[0028]
Further, the vehicle body supporting device 30 operates the outrigger 33 to control the expansion / contraction operation of the extension cylinder 37 shown in FIG. 1 and the jack 35 to operate the expansion / contraction operation of the ground cylinder 39 shown in FIG. It has a grounded cylinder control valve 57 for controlling, and a controller 59 for controlling the opening of these control valves 55, 57. These control valves 55 and 57 are electrically connected to the controller 59. The controller 59 controls the operation of the jack 35 and the outrigger 33 based on operation signals from the jack operation switch 43 and the outrigger operation switch 47, and the jack state detection sensor 51 detects that the jack 35 is in the retracted state. In addition, when the overhang operation by the outrigger operation switch 47 and the extension operation by the jack operation switch 43 are performed simultaneously, the operation of the outrigger 33 and the jack 35 is restricted, and when the storage operation by the outrigger operation switch 47 is performed, An operation restricting circuit 63 for restricting the operation of the outrigger 33 when the jack state detection sensor 51 does not detect the stored state of the jack 35.
[0029]
Further, the controller 59 has a memory 65 in which operation contents for automatically operating the outrigger 33 and the jack 35 based on the operation signal when the automatic operation switch 49 is connected. The memory 65 has an automatic extension memory 67 in which contents of automatically extending all four outrigger jacks 31 are set, and an automatic storage memory 69 in which contents of automatically storing all four outrigger jacks 31 are set. are doing. After the outrigger 33 has been extended, the jack 35 is extended and the tip thereof is grounded after the outrigger 33 is extended, and the content of the effect that the automatic extension operation is terminated when all the outrigger jacks 31 have been grounded is set. I have. The automatic storage memory 69 is set to store the jack 35 in the outrigger 33, then store the outrigger 33 in the vehicle body 3, and terminate the automatic storage operation when all the outriggers 33 are stored. ing.
[0030]
Therefore, when the automatic operation switch 49 is operated, the controller 59 reads out the operation content from the memory 65 based on the operation signal of the automatic operation switch 49, and the operation control circuit 61 sends the outrigger 33 in accordance with the read operation content. And the operation of the jack 35 is controlled to extend or retract the outrigger jack 31.
[0031]
The controller 59 has a built-in timer 71 which can set a predetermined time from when the automatic operation switch 49 is operated and the operation signal is received. The predetermined time can be arbitrarily set by the operator.
[0032]
In addition, the vehicle body support device 30 has an alarm buzzer 73 that is activated by an instruction from the operation control circuit 61 when the operation of the outrigger 33 or the jack 35 is abnormal. The alarm buzzer 73 is provided when the jack state detection sensor 51 does not detect the storage state of the jack 35 when the worker performs the storage operation with the outrigger operation switch 47, or when the jack state detection sensor 51 and the outrigger state detection sensor 53 If the stored signal is not detected or the detected signal does not change within a predetermined time after at least one of the automatic storage switches 49 is connected (from the time when the stored signal is received by the timer 71), the operation control circuit 61 The alarm buzzer 73 is operated by the command. Note that an alarm lamp (not shown) can be used instead of the alarm buzzer 73, and an alarm lamp can be used together with the alarm buzzer 73.
[0033]
Next, the operation of the vehicle body support device 30 according to the present invention will be described for the case where the outrigger jack 31 is extended and the case where it is stored. First, the operation when the outrigger jack 31 is manually extended will be described. First, the aerial work vehicle 1 is moved to a work site with the telescopic boom 13 stored in the vehicle body 3 shown in FIG. Then, the operator moves to the operation plate 41 provided in the rear part of the vehicle body 3 and shown in FIG. 3, and tilts the switch portions 47a of the four outrigger operation switches 47 upward. The outrigger operation switches 47 may be operated individually or may be operated at the same time for all four. In the present embodiment, a case where four operations are performed at the same time will be described. Here, when the jack 35 is detected to be in the retracted state by the jack state detection sensor 51 shown in FIG. 4 and the outrigger operation switch 47 and the jack operation switch 43 are simultaneously operated, the operation restricting circuit 63 of the controller 59 is operated. Operates to cut off the control signal output from the operation control circuit 61 and regulate the operation of the outrigger 33 and the jack 35. This allows
Even if the vehicle body 3 is placed on an inclined position, the vehicle body 3 can be prevented from becoming unstable. When the jack state detection sensor 51 detects the grounding state of the jack 35 at the time of the extension operation of the outrigger 33, the operation restriction circuit 63 is activated, and the outrigger 33 output from the operation control circuit 61 is activated. The overhang control signal is cut off to regulate the overhang operation of the outrigger 33, and the operation control circuit 61 sounds an alarm buzzer 73. For this reason, the outrigger 33 does not protrude while the ground plate 35c of the jack 35 shown in FIG. 1 is in the ground state, so that damage to the road surface and deformation of the mounting portion of the ground plate 35c can be prevented beforehand. By sounding the alarm buzzer 73, the worker can be notified that the jack storage operation 35 is necessary.
[0034]
An operation signal from the outrigger operation switch 47 is converted into a control signal via an operation control circuit 61, and based on the control signal, the opening degree of the overhang cylinder control valve 55 is controlled so that the overhang cylinder 37 shown in FIG. The extension operation is controlled, and the outrigger 33 protrudes from the vehicle body 3 and stops in the fully extended state. That is, since the outrigger 33 is provided with the outrigger state detection sensor 47, this outrigged state is detected by the outrigger state detection sensor 47, and based on the overhang signal, the operation control circuit 61 controls the entire overhang cylinder 37 to operate. Stop in the extended state.
[0035]
Then, after confirming the fully extended state of the outrigger 33, the operator lowers the switch portion 43a of the jack operation switch 43 shown in FIG. When the jack operation switch 43 is connected, the ground signal is converted into a control signal via an operation control circuit 61 shown in FIG. 4, and the opening of the ground cylinder control valve 57 is controlled based on the control signal, and the operation is performed as shown in FIG. The grounding cylinder 39 shown in the drawing extends to extend the jack 35, and the grounding plate 35c at the tip end thereof is grounded. When the grounding plate 35c is grounded, the jack state detection sensor 51 shown in FIG. 4 detects the grounding state of the jack 35, and based on this grounding signal, the operation control circuit 61 controls the grounding cylinder control valve 57 to extend the jack 35. The operation is stopped, and the ground lamp 45 shown in FIG. 3 is turned on. The worker confirms that the four ground lamps 45 are turned on, and ends the operation of extending the outrigger jack 31. Further, based on the ground signal from the jack state detection sensor 51, the operation restricting circuit 63 operates to restrict the expansion and contraction operation of the outrigger 33. For this reason, since the outrigger 33 does not operate even if the operator operates the outrigger operation switch 47 by mistake, damage to the road surface and the ground plate 35c can be prevented beforehand.
[0036]
Next, the operation when the outrigger jack 31 is automatically extended will be described. To automatically extend the outrigger jack, the switch 49a of the automatic operation switch 49 shown in FIG. When the overhang operation of the automatic operation switch 49 is connected, the overhang signal is sent to the operation control circuit 61 shown in FIG. 4, and the operation control circuit 61 selects the automatic overhang memory 67 of the memory 65 and is set. The content is read out, and the outrigger 33 and the jack 35 are extended in accordance with the content to ground the ground plate 35c at the tip of the jack 35. Here, when the outrigger 33 is extended, the operation when the jack 35 is not stored or when the jack 35 touches the ground is the same as described above, and the description thereof is omitted.
[0037]
Next, the operation when the outrigger jack 31 is stored will be described. First, automatic storage of the outrigger jack 31 will be described. The operator tilts the switch 49a of the automatic operation switch 49 shown in FIG. 3 upward to output an automatic storage signal. This automatic storage signal is received by the operation control circuit 61 and the timer 71 shown in FIG. 4, and the operation control circuit 61 selects the automatic storage memory 69 in the memory 65 based on the automatic storage signal, and stores the contents set therein. The readout and the operation of the outrigger 33 and the jack 35 are controlled based on the contents. Further, the timer 71 counts a predetermined time set when the automatic storage signal is received, and outputs a time signal to the operation restriction circuit 63 when the predetermined time has elapsed.
[0038]
More specifically, the operation control circuit 61 controls the opening of the ground cylinder control valve 57 to reduce the size of the ground cylinder 39 and the jack 35 in accordance with the contents set in the automatic storage memory 69. To be stored in the outrigger 33. When all of the four jack state detection sensors 51 detect the storage state of the jack 35 and the outrigger state detection sensor 53 detects that the jack 35 is not in the storage state, the operation control circuit 61 controls the overhang cylinder control valve. By controlling the opening of 55, the extension cylinder 37 is contracted, and the outrigger 33 is contracted and stored in the vehicle body 3. Then, when all of the four outrigger state detection sensors 53 detect the storage state of the outrigger 33, the storage operation of the outrigger jack 31 ends.
[0039]
Here, when the jack 35 is automatically stored, when the jack state detection sensor 51 does not detect the stored state of the jack 35, that is, when the jack 35 is in the grounded state or the non-stored state, the operation control circuit 61 The ground cylinder 39 is contracted until the jack 35 is completely retracted. For this reason, the outrigger 33 is not reduced in a state where the ground plate 35c is in contact with the ground plate, and damage to the road surface and deformation of the mounting portion of the ground plate 35c can be prevented. And so on can be prevented.
[0040]
When the outrigger 33 is stored and the outrigger state detection sensor 53 detects the storage state of all the outriggers 33, the operation control circuit 61 operates to store the contents set in the automatic storage memory 69. The execution of the processing for storing the outrigger 33 is omitted, and the automatic storage processing of the outrigger jack 31 is ended. For this reason, if the storing process of the outrigger 33 is executed even though the outrigger 33 is in the stored state, the hydraulic supply source (hydraulic motor) for reducing the operation of the extension cylinder 37 continues to operate, and this hydraulic supply source Is supplied to the tank via the overhang cylinder 37 and a relief valve provided in a hydraulic circuit communicating with a hydraulic supply source, and the hydraulic oil circulates through the relief valve and the tank. For this reason, when the storage operation of the outrigger 33 is not required, the storage processing of the outrigger 33 is omitted, so that electric power for operating the hydraulic supply source can be saved.
[0041]
In the automatic storage processing of the outrigger jack 31, at least one of the detection signals of the jack state detection sensor 51 and the outrigger state detection sensor 53 does not change within a predetermined time set in the timer 71 from when the automatic operation 49 switch is connected. If it does not change continuously, or if the storage of the outrigger jack 31 is not completed, the operation restricting circuit 63 operates to restrict the operation of the outrigger 33 and the jack 35, and the operation control circuit 63 operates to activate the alarm buzzer. Ring 73. That is, when the signal does not change within a predetermined time set in the timer 71, an oil leak occurs in a hydraulic circuit (not shown) for operating the overhang cylinder 55 or the grounding cylinder 57, or the jack 35 Assuming that an abnormal situation has occurred in which an obstacle has collided, the operation of the outrigger 33 and the jack 35 is regulated, and the alarm buzzer 73 sounds. For this reason, the worker can recognize the abnormal situation of the vehicle body support device 30 at an early stage, and can prevent the damage of the vehicle body support device 30 from spreading. Further, when the storage operation of the outrigger jack 31 is not completed within a predetermined time, the operator can recognize that there is an abnormal situation in the vehicle body support device 30, so that the operator operates the automatic operation switch 49 again in this state. Activation can be prevented.
[0042]
Next, an operation when the outrigger jack 31 is manually stored in the vehicle body 3 will be described. The operator tilts the switch portions 43a of the four jack operation switches 43 shown in FIG. 3 upward to generate a storage signal. The four jack operation switches 43 may be operated individually without being operated at the same time. The stored signal is sent to the operation control circuit 61 of the controller 59 shown in FIG. 4, and the operation control circuit 61 converts the stored signal into an operation control signal to control the opening degree of the ground cylinder control valve 57, as shown in FIG. The ground cylinder 39 is contracted.
[0043]
When the jack 35 is stored in the outrigger 33, the operator tilts the switch portion 47a of the outrigger operation switch 47 shown in FIG. 3 upward to generate a storage signal. The stored signal is sent to the operation control circuit 61 shown in FIG. 4, and the operation control circuit converts the outrigger storage signal into an operation control signal to control the opening degree of the overhang cylinder control valve, thereby controlling the overhang cylinder shown in FIG. Is operated to retract the outrigger in the vehicle body.
[0044]
Here, when the outrigger 33 is stored, when the jack state detection sensor 51 does not detect the stored state of the jack 35, the operation restricting circuit 63 shown in FIG. The control circuit 61 operates to sound the alarm buzzer 73. For this reason, when the grounding plate 35c is grounded or the jack 35 is not stored, the retracting operation of the outrigger 35 is restricted, so that the road surface is damaged, the mounting portion of the grounding plate 35c is deformed, and the jack 35 hits an obstacle. Can be prevented beforehand.
[0045]
【The invention's effect】
As described above, according to the body support device for an aerial work vehicle of the present invention, when the jack is not in the retracted state when the outrigger is operated, the operation of the outrigger is performed. Electrically By restricting, the tip of the jack is dragged on the road surface to damage the road surface, and the jack tip can be prevented from being deformed.
[0046]
Further, an automatic storage switch that is operated when the outrigger and the jack are automatically stored in the vehicle body, and an outrigger state detection unit that detects an overhang and a stored state of the outrigger are provided, and the operation control unit operates the automatic storage switch. Then, when the outrigger is stored in the vehicle body after the jack is stored in the outrigger, the outrigger is not operated to contract when the jack is not stored, so that it is possible to prevent the jack from colliding with an obstacle or the like. . Further, since the outrigger and the jack are automatically stored, the storage operation can be simplified and the storage time can be reduced.
[0047]
Further, when the jack is in the retracted state and the outrigger is in the retracted state, the operation control means omits the outrigger retracting operation and terminates the outrigger and jack automatic storage, thereby omitting the outrigger retracting operation. Therefore, it is possible to save electric power for operating the drive source required to store the outrigger.
[0048]
In addition, after operating the automatic storage switch, if at least one of the jack state detection means and the outrigger state detection means does not detect the operation within a predetermined time from when the automatic storage switch is operated or the detected value does not change, the operation is performed. If the restricting means performs at least one of the operation control and the warning operation of the outrigger and the jack, it is considered that the jack or the outrigger has some abnormal condition, and the operation restricting means performs the operation restriction and the warning operation of the outrigger and the jack. Is performed. For this reason, abnormalities of the outrigger, the jack, the drive source for operating the outrigger, the jack, and the like can be found at an early stage.
[0049]
Furthermore, it has an automatic extension switch operated when the outrigger and the jack are automatically extended from the vehicle body, and when the automatic extension switch is operated, the operation control means extends the outrigger from the vehicle body, and then the jack is moved downward. When the extension is extended and the tip of the jack is grounded to terminate the automatic extension, the outrigger jack can be automatically extended by the automatic extension switch, simplifying the extension operation and shortening the extension time. Can be.
[Brief description of the drawings]
FIG. 1 is a perspective view of an aerial work vehicle equipped with a vehicle body support device according to an embodiment of the present invention.
FIG. 2 is a side view of a rear part of the aerial work vehicle on which the operation plate of the vehicle body support device according to the embodiment of the present invention is mounted.
FIG. 3 is a front view of an operation plate of the vehicle body support device according to the embodiment of the present invention.
FIG. 4 is a block diagram of the vehicle body support device according to the embodiment of the present invention.
[Explanation of symbols]
1 work platforms
5 Body
30 Body support device
33 Outrigger
35 jack
43 jack operation switch (jack operation operation means)
47 Outrigger operation switch (outrigger operation operation means)
49 Automatic operation switch (automatic retract switch, automatic extension switch)
51 Jack status detection sensor (jack status detection means)
53 Outrigger state detection sensor (outrigger state detection means)
61 Operation control circuit (operation control means)
63 Operation regulation circuit (operation regulation means)

Claims (5)

The vehicle includes a plurality of outriggers which extend to the left and right sides before and after the vehicle body and are provided so as to be freely retractable, and a jack which is provided at each end of the plurality of outriggers to extend downward and to be freely stored. A vehicle support device for an aerial work vehicle that supports the vehicle body by extending the jack by extending the outrigger to the side of the vehicle body, extending the jack, and grounding a tip end of the jack,
Outrigger operation operating means for manually operating the outrigger extension / retraction operation,
Jack operation operating means for manually operating the extension / retraction operation of the jack,
Jack state detection means for detecting the grounding and storage state of the jack,
Operation control means for controlling the operation of the outrigger based on operation information by the outrigger operation operation means, and controlling the operation of the jack based on operation information by the jack operation operation means;
When the jack state detecting means does not detect the retracted state of the jack when the outrigger operation operation means is operated, the operation of the outrigger is electrically restricted to a road surface at the tip end of the jack. And an operation restricting means for restricting the drag of the vehicle. An automatic storage switch that is operated when the outrigger and the jack are automatically stored in the vehicle body, and an outrigger state detection unit that detects an overhang and a stored state of the outrigger,
When the automatic storage switch is operated, the operation control means reduces the size of the jack and stores the jack, and moves the outrigger to the vehicle body when the jack state detection means detects the storage state of the jack. 2. The aerial work vehicle according to claim 1, wherein the automatic storage of the outrigger and the jack is terminated when the outrigger state detection means detects the storage state of all the outriggers. Body support device. When all the jacks are in the stowed state by the jack state detecting means, and when all the outriggers are in the stowed state by the outrigger state detecting means, the operation control means 3. The body support device for an aerial work vehicle according to claim 2, wherein the storage operation of the outrigger is omitted to terminate the automatic storage of the outrigger and the jack. After operating the automatic storage switch, when at least one of the jack state detection means and the outrigger state detection means does not detect an operation or a detected value does not change within a predetermined time from when the automatic storage switch is operated. 4. The vehicle body support device for an aerial work vehicle according to claim 2, wherein the operation restricting means performs at least one of operation restriction and warning operation of the outrigger and the jack. An automatic extension switch operated when the outrigger and the jack are automatically extended from the vehicle body, and when the automatic extension switch is operated, after the operation control means extends the outrigger from the vehicle body, 5. The body support device for an aerial work vehicle according to any one of claims 1 to 4, wherein the jack is extended downward to ground the tip end of the jack to terminate the automatic extension.

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