JP2000272895A - Car body supporting device for vehicle for high lift work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a point of a jack and a road surface from being damaged by regulating the operation of an outrigger and the jack when the jack is in a docked state, and the outrigger and the jack are simultaneously operated, so that the operation of the outrigger is regulated when the jack is not in a docked state in the operation of the outrigger. SOLUTION: A car body supporting device 30 is provided with a jack condition detecting sensor 51 for detecting the grounding and accomodating condition of each jack 35, and an outrigger condition detecting sensor 53 for detecting the overhanging and accomodating condition of the outrigger 33. A controller is provided with an operation regulating circuit 63 for regulating the operation of the outrigger 33 and the jack 35 when the docked state of the jack 35 is detected by the jack condition detecting sensor 51, and the outrigger overhanging operation and the jack extending operation are simultaneously executed. When the jack 35 is not docked in the outrigger docking operation, the operation of the outrigger 33 is regulated. Whereby the road surface and earth plate can be prevented from being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. 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. About.

[0002]

2. Description of the Related Art A work vehicle, such as a high work vehicle or a crane truck, having a boom that can freely move up and down on the vehicle body is provided on each of the front and rear sides of the vehicle body so as to protrude laterally from the vehicle body and to be retractable. And a jack provided at the tip 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 a direction in which the vehicle body is overturned 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 corresponding to each of the outrigger and the jack.

[0003] In a high work vehicle, an outrigger jack automatic storage device (hereinafter, referred to as an "automatic storage device") that can automatically perform an operation of storing a grounded outrigger jack in a vehicle body with a single switch. Some have. By using this automatic storage device, the storage time can be greatly reduced, and the work efficiency can be improved.

[0004]

However, the manual operation of the outrigger and the jack is performed by a separately provided operating device, so that the outrigger and the jack can be simultaneously operated. Therefore, if the outrigger is extended or stored while the jack tip is grounded, there is a risk that the road surface will be damaged, or the mounting portion of the jack tip will be deformed.

When the outrigger jack is automatically stored in the vehicle body, the time required for storage is set by a timer,
When the outrigger and the jack are stored within the set time, the hydraulic motor that is the supply source of the hydraulic oil supplied to the outrigger and the jack is stopped even if the storage of the outrigger jack is completed in a shorter time than the set time. The rotation continues without doing so. 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 is stopped after the predetermined time has elapsed, but it is possible to operate the automatic storage device 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 operates in this state, the problem that the discovery of the abnormal situation is delayed is caused. .

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. It is an object of the present invention to provide a vehicle body support device for an aerial work vehicle that can prevent waste and can detect an abnormal situation early.

[0007]

According to the present invention, there is provided a vehicle support apparatus for an aerial work platform, comprising: A plurality of outriggers, each of which has a jack that extends downward and is retractably provided at each end thereof, extends the outrigger to the side of the vehicle body, extends the jack, and grounds the end of the jack. It supports 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 (for example, jack operation switch 43 in the embodiment), jack state detection means (for example, jack state detection sensor 51 in the embodiment) for detecting the grounding and storage state of the jack, and operation information from outrigger operation operation means. Operation control means (for example, the operation control circuit 61 in the embodiment) for controlling the operation of the outrigger and controlling the operation of the jack based on operation information from the jack operation operation means; Is detected and the outrigger actuation operation means When the operation and the jack operation operation means are simultaneously performed, the operation of the outrigger and the jack is restricted, and when the outrigger operation operation means is operated, the jack state detection means detects the storage state of the jack. When there is not, it is preferable to have an operation control means (for example, the operation restriction circuit 63 in the embodiment) for restricting the operation of the outrigger.

To extend and retract the outrigger and the jack, the outrigger operating means and the jack operating means are operated. The operation control means operates the outrigger and the jack based on the operation information, and the outrigger and the jack are extended and stored.

However, if the jack is in the retracted state and the operation of the outrigger operation operating means and the operation of the jack operation operation means are performed simultaneously, the operation restricting circuit restricts the operation of the outrigger and the jack, When the jack state detecting means does not detect the stored state of the jack when the operation means is operated, the operation of the outrigger is restricted. For this reason, simultaneous extension operation of the outrigger and the jack can be restricted to prevent the vehicle body from becoming unstable. In addition, by restricting the operation of the outrigger when the jack is not in the retracted state when the outrigger is stored, it is possible to prevent the tip of the jack from being dragged on the road surface and to prevent damage to the road surface and the jack tip. it can.

[0010] An automatic storage switch (for example, the automatic operation switch 49 in the embodiment) operated when the outrigger and the jack are automatically stored in the vehicle body, and an outrigger state detection means (for example, an outrigger state detecting means for detecting the overhanging and retracted state of the outrigger). When the automatic storage switch is operated, the operation control means reduces the size of the jack and stores it, and when the jack state detection means detects the storage state of the jack, Preferably, the outrigger is moved to the vehicle body side and stored, and the automatic storage of the outrigger and the jack is terminated when the outrigger state detection means detects the stored state of all outriggers.

In order to automatically store the outrigger and the jack in the vehicle body, first, an automatic storage switch is connected. 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 detection 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, so that 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.

When the jack state detecting means detects that all jacks are in the stowed state, and when the outrigger state detecting means detects that all outriggers are in the stowed state, the operation control means sets the outrigger. It is preferable that the storage operation of the outrigger and the jack be automatically terminated by omitting the storage operation of the outboard.

When all the outriggers are stored in the vehicle body when the jack is in the stored state, the processing for 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.

After the automatic storage switch is operated, 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 within a predetermined time after the automatic storage switch is operated. The operation restriction means may perform at least one of the operation restriction and the warning operation of the outrigger and the jack.

If at least one of the jack state detecting means and the outrigger state detecting means does not detect the operation or the detected value does not change after operating the automatic storage switch, the jack / outrigger / detecting means, etc. Assuming that the state has occurred, 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.

An automatic extension switch (for example, the automatic operation switch 49 in the embodiment) 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 is activated. After the outrigger has been extended from the vehicle body, the jack may be extended downward to ground the jack tip so that the automatic extension is terminated.

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 shortened.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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. Fig. 1
As shown in FIG. 1, the vehicle is constructed based on a truck, has a driving cabin 5 in front of the vehicle body 3, and running wheels 7 are disposed on the left and right sides of the driving cabin 5 and the rear part of the vehicle body 3.
A turning table 9 is provided at the rear of the vehicle body 3 so as to protrude upward and turn freely. 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 portion of the swivel base 9, and the telescopic boom 13 is configured to be freely movable by a telescopic operation of a telescopic cylinder 15 built in the telescopic boom 13. An up-and-down cylinder 17 is swingably connected between the base of the telescopic boom 13 and the bottom of the swivel table 9.
The telescopic boom 13 is configured to perform an up / down operation.

At the tip of the telescopic boom 13 is a vertical post 1
The vertical post 19 is provided with a worktable 21 on which a worker can ride 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 regardless 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.

A boom operating section 23 is provided on each of the side 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 swing motor 11 and the boom operating section 23 are operated. By operating the operation of the undulating cylinder 17 and the telescopic cylinder 15, the telescopic boom 13 can be raised and contracted,
By turning, the work table 21 can be moved to a desired high position.

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 tip of the outrigger 33 so as to be able to extend downward.
An outrigger 33 is built in the outrigger 33, and is configured so that the outrigger 33 can be extended from the vehicle body 3 and retracted by expanding and contracting the overhang cylinder 37.

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. ing. A grounding cylinder 39 is built in the inner post 35b, and the grounding cylinder 39 is expanded and contracted to cause the inner post 35b to expand and contract to ground the grounding plate 35c.
b can be stored in the outer post 35a.

FIG. 2 is a drawing showing the rear part of the vehicle body 3.
As shown in the figure, an operation plate 41 that is a part of the vehicle body support device 30 and that operates the outrigger jack 31 is provided on the left side of the rear part of the vehicle body 3. This operation plate 41
As shown in FIG. 1 and FIG. 3, a jack operation switch 43 for individually expanding and contracting each of the four jacks 35 disposed on the left and right sides of the vehicle body 3, and when each jack 35 is in the ground state A ground lamp 45 that is turned on, an outrigger operation switch 47 that individually protrudes and retracts each of the four outriggers 33 disposed on the left and right sides of the vehicle body 3, and is operated when the outrigger jack 31 is automatically extended and retracted. And an automatic operation switch 49.

The jack operation switch 43 has a switch portion 43a projecting rearward of the vehicle (perpendicular to the plane of FIG. 3) and swinging up and down. When the switch 43a is in a neutral state (perpendicular to the plane of FIG. 3). When the switch unit 43a is tilted downward from the neutral state, an operation signal for contracting the jack 35 is transmitted.
5 transmits an operation signal for extending operation, and the switch unit 43a
Is set to the neutral state, the jack 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. A grounding lamp 45 disposed below each jack operation switch 43 is lit when the jack 35 is grounded, and this lighting allows the operator to operate the jack 3.
5 can be confirmed.

The outrigger operation switch 47 has a switch portion 47a projecting rearward of the vehicle and swinging up and down. The switch portion 47a is tilted upward from a neutral state (a state perpendicular to the plane of FIG. 3). And outer post 35a
Is transmitted to the vehicle body 3 and the switch portion 47a is lowered from the neutral state to the outer post 35a.
When an operation signal for operating in the direction of projecting from the vehicle body 3 is transmitted, and the switch portion 47a which is tilted up or down is set to the neutral state, the operation of the outrigger 33 is stopped.

The automatic operation switch 49 has a switch portion 49a projecting rearward of the vehicle and swinging up and down. The switch portion 49a is tilted upward from a neutral state (a state perpendicular to the plane of FIG. 3). And a storage signal for automatically storing all four outrigger jacks 31 in the vehicle body 3, and when the switch unit 49a is tilted downward from the neutral state, all four outrigger jacks 31 protrude from the vehicle body 3. When a ground signal for grounding the ground plate 35c at the tip of the jack is transmitted and the switch portion 49a that has been tilted up or down is set to the 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.

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 jacks other than the above-described automatic operation switch 49, jack operation switch 43, and outrigger operation switch 47. The jack 35 has a jack state detection sensor 51 for detecting a grounding state and a 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. In addition, 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 overhang and storage state. This outrigger state detection sensor 5
3 outputs an overhang signal and a storage signal when each outrigger 33 is in the overhang and storage state.

The body support device 30 includes an outrigger 33.
And a grounding cylinder control valve 57 for operating the jack 35 to control the expansion / contraction operation of the grounding cylinder 39 shown in FIG. These control valves 55, 57
And a controller 59 for controlling the opening degree of. These control valves 55 and 57 are electrically connected to the controller 59. The controller 59 includes an operation control circuit 61 that 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 a jack state detection sensor 51.
The operation of the outrigger 33 and the jack 35 is restricted when the jack 35 is detected to be in the retracted state and the extension operation by the outrigger operation switch 47 and the extension operation by the jack operation switch 43 are performed simultaneously. An operation regulating circuit 63 regulates the operation of the outrigger 33 when the jack state detection sensor 51 does not detect the stored state of the jack 35 when the switch 47 performs the storage operation.

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 are set. This 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. . After the outrigger 33 has been extended, the jack 35 is extended to ground the distal end thereof after the outrigger 33 has been 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. Further, 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.

For this reason, when the automatic operation switch 49 is operated, the controller 59 sets the automatic operation switch 49
The operation content is read out from the memory 65 based on the operation signal of the operation control circuit 6 and the operation control circuit 6
1 controls the operation of the outrigger 33 and the jack 35,
The outrigger jack 31 is extended or stored.

The controller 59 has a built-in timer 71 that 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 an operator.

The body support device 30 includes an outrigger 33.
An alarm buzzer 73 is provided which is activated by a command from the operation control circuit 61 when the operation of the jack 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 When at least one of the automatic storage switches 49 is connected (when the storage signal is received by the timer 71) and the storage signal is not detected or the detection signal does not change within a predetermined time, the operation control circuit 61
The alarm buzzer 73 is operated in response to 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.

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.
Tilt 7a upward. The outrigger operation switches 47 may be operated individually, or may be operated at the same time for four outriggers. In this embodiment, a case where four operations are performed at the same time will be described.
Here, when the jack state detecting sensor 51 shown in FIG. 4 detects that the jack 35 is in the retracted state 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 can prevent the vehicle body 3 from becoming unstable even when the vehicle body 3 is placed on an inclined place. 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.
Of the outrigger 33 by interrupting the overhang control signal, 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.

An operation signal from the outrigger operation switch 47 is converted into a control signal via an operation control circuit 61. Based on this control signal, the opening of the overhang cylinder control valve 55 is controlled, and the overhang shown in FIG. The extension operation of the cylinder 37 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, the outrigger state is detected by the outrigger state detection sensor 47, and the operation control circuit 61 controls the entire overhang cylinder 37 based on the overhang signal. Stop in the extended state.

After the operator confirms the fully extended state of the outrigger 33, the jack operation switch 4 shown in FIG.
The switch unit 43a of No. 3 is turned down. 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 based on this control signal, the opening of the ground cylinder control valve 57 is controlled. The illustrated grounding cylinder 39 extends to extend the jack 35, and the grounding plate 35c at the distal end thereof is grounded.
When the grounding plate 35c is grounded, the jack state detecting sensor 51 shown in FIG. 4 detects the grounding state of the jack 35, and the operation control circuit 61 controls the grounding cylinder control valve 57 based on the grounding signal to extend the jack 35. The operation is stopped, and the ground lamp 45 shown in FIG. 3 is turned on. The operator 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, even if a worker operates the outrigger operation switch 47 by mistake, the outrigger 33 does not operate, so that damage to the road surface and the ground plate 35c can be prevented.

Next, the operation when the outrigger jack 31 is automatically extended will be described. To automatically extend the outrigger jack, the automatic operation switch 4 shown in FIG.
The switch portion 49a of No. 9 is lowered. 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,
The set contents are read out, and the outrigger 33 and the jack 35 are extended in accordance with the contents, and the ground plate 35c at the tip of the jack 35 is grounded. Here, when the outrigger 33 is extended, the operation when the jack 35 is not stored or when the jack 35 is grounded is the same as that described above, and the description thereof is omitted.

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 shown in FIG.
Is received by the operation control circuit 61 and the timer 71, the operation control circuit 61 selects the automatic storage memory 69 in the memory 65 based on the automatic storage signal, reads out the content set therein, and, based on this content, The operation of the outrigger 33 and the jack 35 is controlled. 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.

More specifically, the operation control circuit 61 first controls the opening degree of the ground cylinder control valve 57 in accordance with the contents set in the automatic storage memory 69, and
9 is contracted, and the jack 35 is contracted and 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. 55 by controlling the opening degree
Is operated to reduce the size of the outrigger 33 and store it 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.

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 ground state or in the non-stored state, the operation control is performed. Circuit 61
Causes the ground cylinder 39 to contract until the jack 35 is completely retracted. Therefore, the outrigger 33 is not reduced in a state where the ground plate 35c is in contact with the ground plate 35, 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.

When storing the outrigger 33,
The outrigger state detection sensor 53 is used for all outriggers 33.
The operation control circuit 61
Operates to omit the execution of the processing contents for storing the outrigger 33 among the contents set in the automatic storage memory 69, and terminate the automatic storage processing of the outrigger jack 31. 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 unnecessary, the storage processing of the outrigger 33 can be omitted to save power for operating the hydraulic supply source.

In the automatic storage process 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 is
Automatic operation 49
When the outrigger jack 31 does not change within the predetermined time set, does not change continuously, or the storage of the outrigger jack 31 is not completed, the operation restricting circuit 63 operates to activate the outrigger 33.
And the operation of the jack 35 is regulated, and the operation control circuit 63 operates to sound the alarm buzzer 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 and 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 recognizes an abnormal situation of the vehicle body support device 30 at an early stage,
It is possible to prevent the damage to 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 be made to 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.

Next, the operation when the outrigger jack 31 is manually stored in the vehicle body 3 will be described. Fig. 3
Switch part 4 of four jack operation switches 43 shown in FIG.
The storage signal is generated by tilting 3a upward. Note that the four jack operation switches 43 may be operated individually without being operated at the same time. The stored signal is stored in the controller 5 shown in FIG.
The operation control circuit 61 converts the stored signal into an operation control signal to control the opening of the ground cylinder control valve 57 to reduce the operation of the ground cylinder 39 shown in FIG.

When the jack 35 is stored in the outrigger 33, the operator lowers the switch portion 47a of the outrigger operation switch 47 shown in FIG. 3 to generate a storage signal. The stored signal is the operation control circuit 61 shown in FIG.
The operation control circuit converts the outrigger storage signal into an operation control signal, controls the opening of the overhang cylinder control valve, reduces the overhang cylinder shown in FIG. 1, and stores the outrigger in the vehicle body. I do.

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. 4 operates to restrict the storing operation of the outrigger 33. And
The operation 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. Can be prevented beforehand.

[0045]

As described above, according to the body support apparatus for an aerial work vehicle of the present invention, when the jack is in the retracted state and the operation of the outrigger and the operation of the jack are performed simultaneously, the outrigger and the jack are operated. When the jack is not in the retracted state when the outrigger is operated, the operation of the outrigger is regulated to prevent the vehicle body from becoming unstable due to simultaneous operation of the outrigger and the jack. In addition, the jack tip is dragged on the road surface to damage the road surface, and the jack tip can be prevented from being deformed.

Further, an automatic storage switch operated when the outrigger and the jack are automatically stored in the vehicle body, and an outrigger state detection means for detecting the overhang and the stored state of the outrigger are provided, and the operation control means includes an automatic storage switch. When the jack is operated, when the jack is stored in the outrigger and the outrigger is stored in the vehicle body, the outrigger is not reduced when the jack is not stored, thereby preventing the jack from colliding with an obstacle or the like. be able to. In addition, since the outrigger and the jack are automatically stored, the storing operation is simplified, and the storing time can be reduced.

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 automatic storage of the outrigger and the jack. Since the operation is omitted, it is possible to save electric power for operating the drive source necessary for storing the outrigger.

After operating the automatic storage switch,
When at least one of the jack state detecting means and the outrigger state detecting means does not detect the operation or the detected value does not change within a predetermined time from when the automatic storage switch is operated, the operation restricting means restricts the operation of the outrigger and the jack. When at least one of the warning operations is performed, it is considered that the jack or the outrigger has some abnormal state, and 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.

Further, there is provided an automatic extension switch which 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 extends the outrigger from the vehicle body, and then the jack is extended. The extension of the outrigger jack can be automatically extended by an automatic extension switch when the jack is extended downward to ground the jack tip and the automatic extension is completed, simplifying the extension operation and shortening the extension time. Can be achieved.

[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]

REFERENCE SIGNS LIST 1 aerial work vehicle 5 vehicle body 30 vehicle 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 state detection sensor (jack state detection means) 53 Outrigger state detection sensor (outrigger state detection means) 61 Operation control circuit (operation control means) 63 Operation restriction circuit (operation restriction means)

Continued on the front page F term (reference) 3F333 AA08 AB04 CA15 CA16 FA36 FA40 FE03 FE09

Claims (5)

[Claims] 1. A plurality of outriggers which protrude to the left and right sides of the front and rear of a vehicle body and are provided so as to be freely retractable, and jacks which extend downward at respective distal end portions of the plurality of outriggers and are provided so as to be freely retractable. Having the outrigger project to the side of the vehicle body to extend the jack,
A body support device for an aerial work vehicle that supports the vehicle body by grounding a tip end of the jack, comprising: an outrigger operation operation unit that manually operates a projecting / retracting operation of the outrigger; and an extension / retraction operation of the jack. A jack operation means for manually operating the jack, a jack state detection means for detecting a grounding state and a storage state of the jack, and controlling the operation of the outrigger based on operation information by the outrigger operation operation means, the jack operation means Operation control means for controlling the operation of the jack based on the operation information of the jack, and the jack state detection means detects that the jack is in the retracted state, and operates the outrigger operation operation means and the jack operation operation means The operation of the outrigger and the jack is restricted when And an operation restricting means for restricting the operation of the outrigger when the jack state detecting means does not detect the stored state of the jack when the outrigger operation operating means is operated. Body support equipment for aerial work vehicles. 2. An operation control means, comprising: 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 means that detects an overhang and a stored state of the outrigger. When the automatic storage switch is operated, the jack is contracted and stored, and when the jack state detecting means detects the storage state of the jack, the outrigger is moved to the vehicle body side and stored. 2. The body support device for an 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 states of all the outriggers. 3. When all the jacks are in a stored state by the jack state detecting means,
When the outrigger state detection means detects that all the outriggers are in the storage state, the operation control means may omit the storage operation of the outrigger and terminate the automatic storage of the outrigger and the jack. The body support device for an aerial work vehicle according to claim 2, characterized in that: 4. After operating the automatic storage switch,
If at least one of the jack state detecting means and the outrigger state detecting means does not detect the operation or the detected value does not change within a predetermined time after operating the automatic storage switch, the operation restricting means may 4. An operation control and / or a warning operation of an outrigger and the jack are performed.
A body support device for an aerial work vehicle according to the above. 5. An automatic extension switch which is 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 causes the outrigger to move the outrigger to the outrigger. The aerial work vehicle according to any one of claims 1 to 4, wherein after projecting from the vehicle body, the jack is extended downward to ground the jack tip, and the automatic extension is terminated. Body support device.