JP3579590B2 - Work vehicle support device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a support device for supporting a vehicle body by grounding a jack provided on the vehicle body of a work vehicle at the time of work, and further relates to a work vehicle capable of surely grounding wheels when the vehicle body is supported by the jack. It relates to a supporting device.
[0002]
[Prior art]
Jacks are attached to the front, rear, left and right of a work vehicle equipped with a boom that can swing up and down on the vehicle body like a high work vehicle. By appropriately extending these jacks and grounding the grounding plate attached to the lower end thereof, a moment acting on the body in the direction of tipping over based on the weight of the boom and the load at the tip (hereinafter referred to as the “falling moment”) ) Can be supported stably.
[0003]
When performing high-altitude work using an aerial vehicle equipped with such a jack, it is necessary to extend the grounding plate until a sufficient ground reaction force acts on the jack. That is, a work vehicle such as an aerial work vehicle is configured on the basis of a truck that can travel on a general road, so that wheels are provided with suspensions. For this reason, if the jack is not sufficiently extended, even if the jack is in contact with the ground, if the wheels are in contact with the ground, the repulsive force of the suspension acts on the vehicle body and the vehicle cannot be firmly supported. Therefore, when performing the work at a high place, the extension operation of the grounding plate is performed until the wheels of the work at a high place are completely separated from the ground (so-called “cut off the ground”).
[0004]
[Problems to be solved by the invention]
However, in the aerial work vehicle as described above, a grounding detector that detects whether each jack has touched the ground is provided, but in such a detector, it is determined whether the wheels are grounded or not. Could not be detected. For this reason, the detection of the ground separation of the wheels must be performed visually by the operator, and there is a problem that the work of grounding the jack becomes complicated.
[0005]
The present invention has been made in view of such a problem, and it is possible to quickly perform a grounding operation of a jack and to stably support a vehicle body firmly with a grounded wheel. It is intended to provide a vehicle support device.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a work vehicle support device according to the present invention is provided with a plurality of jacks for stably supporting a vehicle body by touching the ground by performing an extension operation from a stowed state. It is arranged in front, back, left and right. Each of these jacks is detected by a ground detecting means as to whether or not the jack is grounded. Further, when a pair of jacks on the front side, the rear side, the left side, and the right side of the plurality of jacks are extended, a pair of wheels on the side provided with the extended jacks are grounded. Is stored in the land inclination angle storage means according to the inclination angle of the vehicle body. Further, an inclination angle detecting means for detecting an inclination angle of the vehicle body in the front-rear and left-right directions is also provided, and when it is detected that all of the plurality of jacks are in contact with the ground, the inclination angle detecting means is used. On the basis of the detected inclination angle of the vehicle body, the jack extension control means (for example, the supply / discharge amount calculator 20b described in the embodiment) extends one of the plurality of jacks and stores the ground-cut inclination angle. The vehicle body is tilted to the sloping tilt angle stored in the means.
[0007]
According to the working vehicle support device configured as described above, if one of a plurality of jacks is extended to incline the vehicle body to the ground inclination angle, the side on which the extended jack is provided is provided. Since the pair of wheels can be grounded, the wheels can be reliably grounded without separately providing a sensor for detecting the grounding of the wheels.
[0008]
In the support device for a work vehicle according to the present invention, when the inclination angle of the vehicle body is equal to or more than the allowable inclination angle until the vehicle body is inclined to the inclination angle stored in the inclination angle storage means, It is preferable that the extension operation restricting means restricts the extension operation of one of the pair of jacks when the allowable inclination angle is reached. By adopting such a configuration, in a case where the inclination angle of the vehicle body becomes large when trying to separate the wheels by one operation of extending the jack, once one of the pair of jacks is extended. After tilting the vehicle body to the permissible tilt angle, extending the pair of jacks at the symmetrical position, and then extending the pair of jacks that were initially expanded again, the tilt angle of the vehicle body does not increase and each wheel Land cutting can be performed.
[0009]
Furthermore, in the working vehicle support device according to the present invention, the state in which the jacks are extended by the jack extension control means to support the vehicle body is horizontal, and the wheels are grounded. It is preferable to provide an automatic leveling means (for example, the automatic leveling switch 17a described in the embodiment) for controlling the operation of the jack. With such a configuration, the operator only needs to perform the operation control operation of the automatic leveling means, and after the pair of jacks perform the extension operation once or a plurality of times and incline to the ground inclination angle, the vehicle body is tilted. Is supported in a horizontal state.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, an aerial work vehicle 10 including a work vehicle support device according to the present invention will be described with reference to FIG. The aerial work vehicle 10 has a pair of front wheels F and a pair of rear wheels R for road running supported by suspension on the front, rear, left and right of the vehicle body 11. It has a swivel table 12 that can freely turn horizontally. A boom 13 which is telescopically (in a telescopic manner) configured to be extendable and retractable is attached to the upper portion of the swivel table 12 so as to be able to move up and down. Further, a work table 14 is attached to the tip of the boom 13, and an operator who gets on the work table can move to an arbitrary height through the operation of the swivel table 12 and the boom 13.
[0011]
When the boom 13 is actuated, a tipping moment acts on the vehicle body 11, so that the front left and right front jacks 15 of the vehicle body 11 are provided as shown in FIG. A pair of front jacks (hereinafter referred to as "front jacks 15" for convenience) provided with a right front jack 15 'is provided, and a pair of rear jacks formed of a left rear jack 16 and a right rear jack 16' are provided on the right and left rear portions of the vehicle body 11. (Hereinafter referred to as “rear jack 16” for convenience). The front jack 15 and the rear jack 16 are arranged at a distance L in the front-rear direction of the vehicle body 11.
[0012]
The configuration of the jack will be described with reference to the left front jack 15 as an example. The jack 15 includes a cylinder tube 15a attached to the vehicle body 11, a rod 15b which is vertically expandable and contractible with respect to the cylinder tube 15a, and a lower end of the rod. And a grounding plate 15c attached to the vehicle body 11. The rod 15b expands and contracts with respect to the cylinder tube 15a by controlling the supply and discharge of hydraulic oil supplied by a hydraulic pump (not shown) provided on the vehicle body 11. It operates. By performing the extension operation, the extension operation of the rod 15b of the stroke JS can be performed from the storage state indicated by the solid line to the maximum extension state indicated by the chain line.
[0013]
As shown in FIG. 3, the four jacks 15 and the like configured as described above control supply and discharge of hydraulic oil by control valves 25, 25 ', 26, and 26' provided corresponding to the jacks 15 and the like. , The expansion and contraction operation can be individually controlled. Therefore, in the aerial work vehicle 10, even when the aerial vehicle 10 is stopped on the ground inclined in the front-rear direction or on the ground inclined in the left-right direction, the amount of extension of each jack 15 or the like is adjusted. Thereby, the aerial work vehicle 10 can be installed at a desired inclination angle including horizontal. The operation of the control valves 24, 24 ', 25, 25' is controlled by operating an operating device 17 provided at the rear of the vehicle body 11. When the operating device 17 is operated to ground and store the jacks 15 and the like, an operation signal from the operating device 17 is transmitted to the controller 20, and the controller 20 outputs the hydraulic oil to each jack 15 and the like based on the operation signals. The operation of the control valves 24, 24 ', 25, 25' for supply / discharge control is controlled, and the grounding operation and storage operation of the jacks 15, 15 ', 16, 16' are controlled.
[0014]
When the automatic horizontal switch 17a is operated, the extension operation of the jacks 15 and the like as described above is performed after the extension operation of each jack 15 and the like is controlled by the work vehicle support device 1 according to the present invention. The work vehicle support device 1 includes, in addition to the jacks 15 and the like, the control valve 24 and the like, and an automatic horizontal switch 17a, an inclination angle detection sensor 19 for detecting an inclination angle of the vehicle body 11 in the front-rear and left-right directions, and a controller 20. , A front left ground detection sensor 15d, a right front ground detection sensor 15d ', a left rear ground detection sensor 16d, and a right rear ground detection sensor 16d for detecting whether each of the ground plates 15c, 15c', 16c, 16c 'is grounded. ′. When the grounding of the ground plate 15c or the like is detected by performing the extension operation of the jack 15 or the like, a ground detection signal is transmitted to the controller 20 from the corresponding installation detection sensor 15d or the like.
[0015]
Here, the grounding of the jack means not only that the jacks 15 support the vehicle body 11 (in a state where a predetermined ground reaction force is obtained), but also the front wheels F and the rear of the aerial work vehicle 10. The wheel R also supports the vehicle body 11 (the state in which the wheels F and R are not floating above the ground and the so-called wheels are not grounded). The grounding detection sensor 15d for detecting such grounding is configured to determine the grounding of the grounding plate 15c or the like by detecting the hydraulic pressure in each jack 15 or the like, or to determine the grounding of the rod 15b and the grounding plate 15c. The grounding of the jack 15 and the like is detected by detecting the operation of a limit switch or a load cell provided therebetween.
[0016]
Next, in the aerial work vehicle 10 having the jack 15 and the like configured as described above, the work vehicle support device 1 supports the vehicle body 11 by grounding the jacks 15, 15 ', 16, 16'. The operation control will be described with reference to FIG. In the following operation control, for convenience, the front jacks 15 and 15 'and the rear jacks 16 and 16' will be described by distinguishing only the front jack 15 and the rear jack 16 without distinguishing the left and right jacks. . Also, the control valves 25, 25 ', 26, 26' and the ground detection sensors 15d, 15d ', 16d, 16d' will be described by distinguishing only front and rear, not left and right.
[0017]
When the front wheels F and the rear wheels R are ground and the jacks 15 and the like are extended so that the vehicle body 11 becomes horizontal while the jacks 15 and the like support the vehicle body 10, the operating device 17 The provided automatic horizontal switch 17a is operated. When the automatic horizontal switch 17a is operated, the front wheels F and the rear wheels R are grounded in the ground contact state, and the respective jacks 15 are extended so that the vehicle body 11 is horizontal. For example, when grounding the jack 15 or the like on the horizontal ground G as shown in FIG. 2, first, the automatic horizontal switch 17a is operated. As a result, both the front and rear jacks 15, 16 start the extension operation from the storage state shown by the solid line in FIG. 2 as shown by the chain line, and as shown in FIG. 1 (A), the grounding plates 15c, 16c contacts the ground G.
[0018]
A ground detection signal is transmitted from the ground detection sensor 15d and the like by the ground, and the controller 20 receiving the ground detection signal controls the control valve 25 and the like for stopping the extension operation of the jack 15 and the like with the ground plate 15c and the like grounded. Perform control. As a result, the extension operation of the jack 15 or the like is stopped in a state where all the ground plates 15c and the like are in contact with the ground G. In the state where all the grounding plates 15c and the like are in contact with the ground, the reaction force of the suspension acts on the front wheel F and the rear wheel R, so that the jack 15 or the like supports the aerial work vehicle 10 only. The suspension does not sink further even if a force that pushes the vehicle body 11 downward acts, although it is not in the state of being in the suspension state.
[0019]
In this way, when it is detected that all the ground plates 15c and the like have touched the ground, the controller 20 uses the inclination angle detection sensor 19 to move the vehicle body 11 in the front-rear and left-right directions in a state where all the ground plates 15c and the like touch the ground. The inclination angle is detected. Then, based on the detected vehicle body inclination angle, a corresponding land separation inclination angle is obtained from data stored in the land separation inclination storage unit 20a provided in the controller 20.
[0020]
Here, the ground-cut inclination angle will be described. The ground inclination angle is defined as the angle of inclination of the vehicle body 11 in a state where all the grounding plates 15c and the like are in contact with the ground as described above. 15, 15 ', a pair of rear jacks 16, 16', a pair of left jacks 15, 16 or a pair of right jacks 15 ', 16' are extended to extend the front, rear, left and right of the vehicle body 11. When a pair of wheels provided on the lifted side are cut off in a state where one of the jacks is lifted, and the other pair of jacks is extended while maintaining the extended state of the pair of jacks Means a desired inclination angle (often horizontal) of the vehicle body 11 and the inclination angle of the vehicle body 11 until all the wheels can be grounded.
[0021]
Hereinafter, the inclination angle of the vehicle body 11 when the ground G is horizontal (the angle of the vehicle body 11 when all the grounding plates 15c and the like are in contact with the ground is horizontal) and the front and rear wheels F and R are ground and the vehicle body 11 is supported. The following describes the calculation of the ground inclination angle θ1 in the case where the jack is grounded first so that the front wheel F is grounded first. The reason why the front wheel F is grounded first is that the parking brake is applied to the rear wheel R in the aerial work vehicle 10, so that the rear wheel R to which the parking brake is applied is used. This is because the body 11 is more stable when the ground is cut off later.
[0022]
When the ground G is horizontal, the vehicle body 11 is horizontal even when all the ground plates 15c and the like are in contact with the ground as shown in FIG. Then, as shown in FIG. 1 (B), only the front jack 15 is extended so that the front of the vehicle body 11 is raised until it reaches the sloping angle θ1. The ground separation inclination angle θ1 at this time is the inclination angle of the vehicle body 11 in a state in which the front wheels F are raised by the movement amount S from a state in which all the ground plates 15c and the like are in contact with the ground.
[0023]
The movement amount S is changed from a state in which the suspension of the front wheels F is sinking due to the weight of the vehicle body 11 as shown by a chain line in FIGS. 2, 1A, and 1B, in FIG. As shown by a solid line, a first movement amount S1 which is a movement amount of the front wheel F to a position where the suspension is fully extended and the front wheel F is free, and visually grasping that the front wheel F is completely lifted off the ground G. And the second movement amount S2, which is the movement amount of the front wheel F, until the movement is completed.
[0024]
In the aerial work vehicle 10 as shown, the front wheel F is provided in front of the front jack 15, so that when the rear jack 16 is extended from the state shown in FIG. As a result, the rear portion of the vehicle body 11 is lifted, the front portion of the vehicle body 11 is lowered, and the front wheel F moves slightly downward. For this reason, the second movement amount S2 is not only the movement amount that makes it clear that the front wheel F has completely separated from the ground G after the suspension is fully extended, but also the front wheel F when the rear jack 16 is extended as described above. Is set in consideration of the amount of movement of.
[0025]
Since the front and rear jacks 15 and 16 are provided at a distance L in the aerial work vehicle 10, the ground-cutting inclination angle θ1 is θ1 = S / L × tan ^-1 Can be obtained by When the ground G on which the jack 15 or the like touches the ground is a sloping ground, the second movement amount S2 is simply used as the front wheel F to calculate the sloping inclination angle θ1 in order to surely skewing the rear wheel R on the sloping ground. Is not the amount of movement that can be lifted from the ground G, but the amount of movement according to the inclination angle of the ground G, as will be described in detail later. Therefore, the ground-cut tilt angle θ1 (movement amount S) is not always constant, but changes depending on the tilt angle of the ground G. The pre-tilt angle θ1 calculated in advance according to the left and right inclination angles is stored.
[0026]
That is, here, the description has been given of the ground inclination angle θ1 for grounding the front wheel F. However, in the ground inclination angle storage device 20a, the ground inclination angle for grounding the rear wheel R is also the same as described above. It is stored according to the inclination angle of G. In addition, a maximum angle is determined for the slope angle θ1. That is, depending on the configuration of the aerial work vehicle 10, there is a suspension work in which the extension of the suspension is increased. In such an aerial work vehicle 10, if the front and rear jacks 15 and 16 are to be grounded by one extension operation, respectively, the extension amount of the jack 15 to be extended first becomes large, and the vehicle body 11 becomes large. When the inclination angle of the vehicle body 11 is increased as described above, various problems such as a movement of a tool placed on the vehicle body 11 may occur. For this reason, in the working vehicle support device 1 according to the present embodiment, by setting the allowable inclination angle corresponding to the inclination angle of the ground G in advance, the inclination angle of the vehicle body 11 becomes large when the jack 15 or the like is extended. I try not to be.
[0027]
First, the suspension of the front and rear wheels F and R has a relatively small extension, and the front and rear jacks 15 and 16 are extended once each so that the vehicle body 11 is level on the horizontal ground G. Will be described. In such a case, first, the ground-cut tilt angle θ1 is obtained from the ground-cut tilt angle storage 20a based on the tilt angle of the vehicle body 11 in the front-back direction with the ground plate 15c or the like grounded as described above. After the ground inclination angle θ1 is determined, the amount of hydraulic oil supplied to and discharged from the front jack 15 necessary to obtain the extension amount of the front jack 15 for raising the vehicle body 11 to the ground inclination angle θ1 is also determined by the controller. The calculation is performed by a supply / discharge amount calculator 20b provided in the apparatus 20. As shown in FIG. 1B, the controller 20 controls the pre-control valve 25 only for the time required to supply and discharge the calculated supply / discharge amount or until the inclination angle of the vehicle body 11 reaches the ground inclination angle θ1. Is operated to extend the front jack 15.
[0028]
When the supply / discharge of the amount of hydraulic oil calculated by the supply / discharge amount calculator 20b to the front jack 15 is completed and the raising operation of the vehicle body 11 is stopped, the inclination of the vehicle body 11 is again detected by the inclination angle detection sensor 19. Perform corner detection. If the detected angle at this time matches the ground-cut inclination angle θ1, it can be determined that the front jack 15 has been reliably extended and the front wheel F has been grounded, and the vehicle body 11 If the rear jack 16 is extended until the rear wheel R becomes horizontal, it can be determined that the rear wheel R can be grounded. For this reason, when the detected angle is equal to the ground inclination angle θ1, the operation control of the front control valve 25 is terminated, and the subsequent extension operation of the front jack 15 is not performed. If the angle does not match the inclination angle θ1, the supply / discharge amount of the hydraulic oil is calculated again by the supply / discharge amount calculator 20b, and the supply / discharge amount of the calculated amount of the hydraulic oil to / from the front jack 15 is calculated. To make the detected angle coincide with the ground inclination angle θ1.
[0029]
When the inclination angle of the vehicle body 11 detected by the inclination angle detection sensor 19 coincides with the ground-cut inclination angle θ1, the inclination angle detection sensor 19 stops the extension operation of the front jack 15 again, and The inclination angle is detected. Then, in the same manner as described above, the ground inclination angle at which the rear wheel R can be ground is obtained from the ground inclination memory 20a, and as shown in FIG. 1C, the inclination angle of the vehicle body 11 is obtained. Supply / discharge control of hydraulic oil that can extend the rear jack 16 until the inclination angle of the ground is reached is performed. Note that, as described above, since the ground-break inclination angle at this time is an inclination angle at which the vehicle body 11 becomes horizontal, when the extension operation of the rear jack 16 is completed, the vehicle body 11 is horizontal and the front wheels F and The vehicle body 11 can be stably supported by the jack 15 or the like with a force against the overturning moment in a state where the rear wheel R is separated from the ground.
[0030]
Next, referring to FIG. 4, the aerial work vehicle 10 ′ in which the suspension of the front and rear wheels F and R has a larger extension than the aerial work vehicle 10 described above, A description will be given of a case where the grounding is performed such that As described above, when the suspension has a large extension, for example, when the front jack 15 is extended until the front wheel F is grounded as shown in FIG. 1B, the inclination angle of the vehicle body 11 becomes large. For this reason, in the aerial work vehicle 10 ′, the extension angle of the front and rear jacks 15, 16 is divided into two operations, whereby the inclination angle of the vehicle body 11 during one extension operation of the jack 15 or the like is predetermined. The allowable inclination angle θ2 is not exceeded.
[0031]
In such a case, first, the inclination angle detection sensor 19 detects the inclination angle of the vehicle body 11 in the front-rear and left-right directions in a state where all the ground plates 15c and the like are in contact with the ground. Then, based on the detected vehicle body inclination angle, a corresponding ground inclination angle is obtained from data stored in the ground inclination storage unit 20a provided in the controller 20. In this case, Since the ground G is horizontal, the ground cutting inclination angle θ1 is larger than the allowable inclination angle θ2. Accordingly, in such a case, as shown in FIG. 4A, when the inclination angle of the vehicle body 11 reaches the allowable inclination angle θ2, the front jack 15 is extended by the extension operation restricting device 20c provided in the controller 20. Is controlled.
[0032]
In the state where the extension operation of the front jack 15 is regulated by the extension operation restricting device 20c, the front wheel F is not grounded as shown in the figure. Then, the inclination angle of the vehicle body 11 in this state is detected, and based on the detected vehicle body inclination angle, a corresponding terrain inclination angle is obtained from the data stored in the terrain inclination angle storage device 20a, and the rear jack is determined. By performing the extension operation of No. 16, the vehicle body 11 is tilted to the ground-cut tilt angle as shown in FIG. After the front and rear jacks 15, 16 have been extended to some extent in this manner, the extension operation of the front jack 15 is performed again as shown in FIG. If the vehicle body 11 can be leveled by performing the operation, the vehicle body 11 can be stably supported in a state where the front wheels F and the rear wheels R are separated from the ground.
[0033]
Next, as shown in FIG. 5A, the jacks 15, 16 are extended on an inclined ground where the aerial work vehicle 10 is lowered by θ3 as shown in FIG. A case where the vehicle body 11 of the aerial work vehicle 10 is installed so as to be horizontal will be described. After the aerial work vehicle 10 is stopped at the position where the aerial work is performed, the automatic horizontal switch 17a provided on the operating device 17 is operated to ground the jack 15 and the like in the same manner as described above. Thus, the front and rear jacks 15 and 16 are extended, and the inclination angle of the vehicle body 11 is detected by the inclination angle detection sensor 19 in a state where the front and rear jacks 15 and 16 are both in contact with the ground. The slope inclination θ1 is calculated.
[0034]
As described above, since the ground-cut tilt angle is stored according to the tilt angle of the ground G, the one that corresponds to the tilt angle θ3 of the ground G is used as the ground-cut tilt angle θ1. That is, when the inclination angle θ3 of the ground is large, the vehicle body 11 can be horizontal even if the front jack 15 is extended by the same amount of extension as when the ground G is horizontal, or the rear jack 16 is extended. The rear wheel R may not be grounded even if the rear jack 16 is extended until the vehicle body 11 is leveled. Therefore, when the ground G is inclined, the second movement amount S2 is set to be relatively large in advance according to the inclination angle θ3.
[0035]
After the ground inclination angle θ1 is obtained, the controller 20 extends the front jack 15 until the front-back inclination angle of the vehicle body 11 becomes the ground inclination angle θ1, as shown in FIG. 5B. Then, after detecting the inclination angle of the vehicle body 11 in the same manner as described above, if the rear jack 16 can be extended to make the vehicle body 11 horizontal as shown in FIG. The vehicle body 11 can be stably supported in a state where the R is separated from the ground.
[0036]
Therefore, according to the work vehicle body support device 1 configured as described above, the detector only needs to use the grounding detection sensor 15d and the like and the inclination angle detection sensor 19 conventionally provided in the high-place work vehicle. Therefore, there is no need to separately provide a detection sensor, and without increasing the manufacturing cost of the aerial work vehicle 10, with a simple configuration, regardless of the proficiency of a worker who performs the grounding operation of the jacks 15, 16. The aerial work vehicle 10 can be surely installed horizontally in a short time in a state where it is separated from the ground.
[0037]
Note that, in the aerial work vehicle 10 as described above, the vehicle body 11 is often placed in a state where the vehicle body 11 is finally installed horizontally, but the vehicle body 11 does not necessarily need to be configured to be installed horizontally. It may be arranged at a predetermined desired angle other than the above. The automatic level switch 17a is not necessarily provided, and the operator may operate the operation device 17 so that the vehicle body 11 becomes horizontal. Further, in the case where the aerial work vehicle 10 is configured by using a vehicle having a small extension of the suspension that can be grounded by one operation of extending the jack, it is not always necessary to provide the extension operation restricting means. .
[0038]
Further, in the above-described embodiment, the state where the ground on which the aerial work vehicle 10 is installed is inclined only in the front-rear direction of the vehicle body 11 has been described. However, in the work vehicle support device according to the present invention, the ground is In the case where the vehicle body 11 is inclined in the left-right direction, when each jack 15, 15 ', 16, 16' touches the ground, it is detected in which direction and how many times the vehicle body 11 is inclined. Then, based on this detection angle, an appropriate amount of hydraulic oil is supplied and discharged to one of the left jacks 15, 16 or the right jacks 15 ', 16' in the same manner as described above, and then an appropriate amount is supplied to the other. By supplying and discharging the hydraulic oil, the grounding of each wheel F, R can be reliably performed.
[0039]
【The invention's effect】
As described above, the work vehicle support device according to the present invention is configured such that when a pair of jacks out of a plurality of jacks are extended, a pair of wheels on the side provided with the extended jacks are grounded. The ground-cut tilt angle, which is the tilt angle of the vehicle body to be made, is stored in the ground-cut tilt angle storage means according to the tilt angle of the vehicle body. Further, when it is detected by the ground detecting means that all of the plurality of jacks are touched, one of the plurality of jacks is extended based on the inclination angle of the vehicle body detected by the inclination angle detecting means. The vehicle body is tilted to the slope angle stored in the slope angle storage means. According to the working vehicle support device configured as described above, if one of a plurality of jacks is extended to incline the vehicle body to the ground inclination angle, the side on which the extended jack is provided is provided. A pair of wheels can be grounded. For this reason, without providing a sensor for detecting the stroke of the jack or a sensor for detecting whether or not a ground reaction force is acting on the wheel, the grounding of the wheel can be detected. In addition, the wheels can be grounded while the vehicle body is reliably supported by the jack.
[0040]
In the work vehicle support device according to the present invention, it is preferable that the extension operation restricting means restricts the extension operation of any one of the pair of jacks when the inclination angle of the vehicle body reaches the allowable inclination angle. By adopting such a configuration, in a case where the inclination angle of the vehicle body becomes large when trying to separate the wheels by one operation of extending the jack, once one of the pair of jacks is extended. After tilting the vehicle body to the permissible tilt angle, extending the pair of jacks at the symmetrical position, and then extending the pair of jacks that were initially expanded again, the tilt angle of the vehicle body does not increase and each wheel Ground cutting can be performed, and a tool or the like placed on the vehicle body does not move.
[0041]
Furthermore, in the working vehicle support device according to the present invention, the state in which the jacks are extended by the jack extension control means to support the vehicle body is horizontal, and the wheels are grounded. It is preferable to provide automatic leveling means for controlling the operation of the jack. With such a configuration, the operator only needs to perform the operation control operation of the automatic leveling means, and after the pair of jacks perform the extension operation once or a plurality of times and incline to the ground inclination angle, the vehicle body is tilted. Is supported in a horizontal state. For this reason, even a worker who is unfamiliar with the work of supporting the vehicle body with the jack can easily support the work with the jack that can safely perform the work.
[Brief description of the drawings]
FIG. 1 is a side view of an aerial work vehicle provided with a support device for a work vehicle according to the present invention, wherein (A) illustrates a ground contact state of a jack on a horizontal ground, and (B) illustrates an extended front jack. (C) shows a state in which the front and rear wheels are ground and the vehicle body is supported horizontally.
FIG. 2 is a side view of the aerial work vehicle.
FIG. 3 is a block diagram showing a configuration of a support device for the work vehicle.
4A and 4B are side views of another aerial work vehicle equipped with the work vehicle support device, wherein FIG. 4A shows a state in which a front jack is extended, and FIG. (C) shows a state where the front wheels are separated by extending the front jack.
FIGS. 5A and 5B are side views of an aerial work vehicle equipped with a work vehicle support device according to the present invention, wherein FIG. 5A shows a ground contact state of a jack on a slope, and FIG. This shows a state in which the front wheels are grounded, and FIG. 4C shows a state in which the front and rear wheels are grounded and the vehicle body is horizontally supported.
[Explanation of symbols]
10 Aerial work vehicles
11 Body
15 Front jack
16 Rear jack
15d, 16d ground detection sensor
19 Inclination angle detection sensor
20 Controller
25, 26 control valve

Claims (3)

A plurality of jacks arranged on the front, rear, left and right of the vehicle body provided with wheels on the front, rear, left and right, performing grounding operation by performing an extension operation from a stored state and stably supporting the vehicle body,
Ground detection means for detecting the ground of each of these jacks,
Inclination angle detection means for detecting an inclination angle in the front-rear and left-right directions of the vehicle body,
When the pair of jacks on the front side, the rear side, the left side, and the right side of the plurality of jacks are extended, the pair of wheels on the side provided with the extended jacks are grounded to tilt the vehicle body. A terrain inclination angle storage means that stores the terrain inclination angle according to the inclination angle of the vehicle body,
When one of the plurality of jacks is detected based on the inclination angle of the vehicle body detected by the inclination angle detection means when it is detected that all of the plurality of jacks are touched by the ground detection means. A support device for a work vehicle, comprising: jack extension control means for extending the vehicle body to the inclination angle stored in the inclination angle storage means. If the inclination angle of the vehicle body is equal to or greater than the allowable inclination angle before the vehicle body is inclined to the land separation inclination angle stored in the land inclination angle storage means, any one of the above-described ones is performed when the allowable inclination angle is reached. The support device for a working vehicle according to claim 1, further comprising an extension operation restricting means for restricting an extension operation of the pair of jacks. The operation of the jacks is controlled so that the state in which the jacks are extended by the jack extension control means and the vehicle body is supported is horizontal and the wheels are grounded. The support device for a working vehicle according to claim 1 or 2, further comprising an automatic leveling unit.

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