JP2018043577A - Outrigger jack operation control device of working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outrigger jack operation control device of a working vehicle which can reduce a slide amount of a vehicle body in a width direction at a lower part of a jack with respect to the ground face.SOLUTION: When performing a jack accommodation operation for accommodating outrigger jacks 30 by grounding front wheels 14 of a vehicle body 10 after grounding rear wheels 15 of the vehicle body 10 from a state that a plurality of the outrigger jacks 30 are hung out, and the vehicle body 10 is suspended, an inclination angle θ in a fore-and-aft direction of the vehicle body 10 is set to a preset prescribed inclination angle θ1, and after that, jack cylinders 32 of all the outrigger jacks 30 are reduced.SELECTED DRAWING: Figure 8

Description

  The present invention relates to an outrigger jack operation control device for a work vehicle in which a work device such as an aerial work device is provided on a truck vehicle.

  Conventionally, in this type of work vehicle, a work device such as an aerial work device is provided in a truck vehicle provided with traveling wheels. This type of work vehicle is provided with outrigger jacks on both sides in the front-rear direction and in the width direction of the vehicle body, and works by the work device in a state where the vehicle body is lifted and supported by projecting the outrigger jack downward. Do.

  As an outrigger jack for this work vehicle, a link type outrigger jack that projects obliquely downward toward the outside in the width direction of the vehicle body and lifts the vehicle body is known (for example, see Patent Document 1).

  In the link type outrigger jack, when performing the jack extension operation and the jack storage operation, the grounding plate provided at the lower end portion of the outrigger jack moves in the width direction of the vehicle body. With a link-type outrigger jack, if the ground plate moves in the width direction of the vehicle with the ground plate grounded, the ground plate or the floor plate inserted between the ground plate and the ground will slide against the ground, damaging the ground. There is a risk of disturbance. For this reason, in this link-type outrigger jack, the lower end side is moved greatly in the width direction of the vehicle body by the expansion and contraction operation in the range where the total length of the jack where the ground plate is not grounded is short, and The structure in which the grounding plate is moved in a substantially vertical direction by an expansion and contraction operation suppresses the generation of scratches and disturbances on the ground.

Japanese Patent No. 5859799

  In a work vehicle equipped with a link type outrigger jack, only the rear wheel of the vehicle body is locked by a parking brake. For this reason, when projecting the outrigger jack, it is necessary to project the outrigger jack on the rear side of the vehicle body after projecting the outrigger jack on the front side of the vehicle body with the wheel on the rear side of the vehicle body in contact with the ground. This prevents the work vehicle from running away. When the outrigger jack is stored, the outrigger jack on the rear side of the vehicle body is stored, the wheels on the rear side of the vehicle body are grounded, and then the outrigger jack on the front side of the vehicle body is stored, so that the work vehicle escapes. Is preventing.

  In the jack extension operation and the jack storage operation of the outrigger jack, the vehicle body is inclined in the front-rear direction. For this reason, when the jack extension operation and the jack storage operation are performed in a state where the vehicle body is tilted in the front-rear direction, the lower end of the jack is grounded by the expansion / contraction operation within the short total length of the rear outrigger jack on the rear side of the vehicle. Thus, a state in which the lower end portion of the jack slides in the width direction of the vehicle body with respect to the ground plane can be caused by the extension / contraction operation of the outrigger jack.

  An object of the present invention is to provide an outrigger jack operation control device for a work vehicle capable of reducing the amount of slip in the width direction of the vehicle body at the lower end portion of the jack with respect to the ground.

  In order to achieve the above object, the present invention provides a plurality of link-type outrigger jacks that are provided on both front and rear sides of a vehicle body having traveling wheels and that project obliquely downward toward the outside in the width direction of the vehicle body to support the vehicle body. When the plurality of outrigger jacks are extended and the vehicle body is lifted, when storing the plurality of outrigger jacks, after grounding the wheel on one side in the front-rear direction of the vehicle body, Jack storage operation control means for performing jack storage operation for grounding the wheel, and the jack storage operation control means sets all the outrigger jacks after setting the inclination angle in the front-rear direction of the vehicle body to a predetermined inclination angle. Reduce.

  As a result, the outrigger jacks on both sides in the front-rear direction of the vehicle body are reduced from a predetermined inclination angle in the front-rear direction of the vehicle body. Therefore, when one wheel in the front-rear direction of the vehicle body contacts the lower end portion of the outrigger jack, Because the outrigger jack can be moved away from the ground by the expansion / contraction operation of the small amount of movement, it is possible to reduce the sliding amount of the lower end portion of the outrigger jack with respect to the ground.

  According to the present invention, it is possible to reduce the amount of sliding of the lower end portion of the jack with respect to the ground, so that it is possible to prevent the ground from being damaged or disturbed.

It is a side view of an aerial work vehicle showing an embodiment of the present invention. It is explanatory drawing of an outrigger jack. It is a block diagram which shows a control system. It is a flowchart of a jack extension operation control process. It is a flowchart of a jack storing operation control process. It is a figure explaining jack extension operation and jack storing operation. It is a figure explaining jack extension operation and jack storing operation. It is a figure explaining jack extension operation and jack storing operation. It is a figure explaining jack extension operation and jack storing operation. It is a figure explaining jack extension operation and jack storing operation.

  1 to 10 show an embodiment of the present invention.

  As shown in FIG. 1, an aerial work vehicle 1 as a work vehicle to which an outrigger jack operation control device of the present invention is applied includes a vehicle body 10 for traveling on a roadway and an aerial work for performing an aerial work. The apparatus 20 is provided.

  As shown in FIG. 1, the vehicle body 10 is provided with a driving cab 12 at a front portion of a chassis frame 11 extending in the front-rear direction, and an aerial work device 20 via a subframe 13 on the rear side. In addition, the vehicle body 10 includes traveling front wheels 14 and rear wheels 15 provided on the left and right sides of the front and rear sides of the chassis frame 11. The direction of the front wheel 14 can be changed by operating the steering wheel in the driving cab 12. The rear wheel 15 is driven by the power of the engine. The rotation of the front wheels 14 and the rear wheels 15 is restricted by the operation of a brake pedal provided in the driving cab 12. Further, the rotation of the rear wheel 15 is also restricted by the operation of a parking brake provided in the driving cab 12.

  As shown in FIG. 1, the aerial work device 20 includes a swivel base 21 that can be swiveled horizontally, a telescopic boom 22 that can be raised and lowered with respect to the swivel base 21, and a bucket 23 that is provided at the tip of the telescopic boom 22. It is equipped with. The swivel base 21 performs a horizontal swivel operation with respect to the vehicle body 10 by a hydraulic swivel turn motor (not shown). The telescopic boom 22 performs a hoisting operation with respect to the swivel 21 by a hydraulic hoisting cylinder 24, and performs an hoisting operation by a hydraulic telescopic cylinder (not shown). The bucket 23 is held by a leveling cylinder (not shown) so that the work floor is always horizontal regardless of the undulation angle of the telescopic boom 22, and horizontally swiveled with respect to the tip of the telescopic boom 22 by a bucket turning motor (not shown). Perform the action.

  Further, as shown in FIG. 1, the aerial work vehicle 1 is provided on both the left and right sides of the front side and the rear side of the sub-frame 13, and 4 for stably supporting the vehicle body 10 when working with the aerial work device 20. Two outrigger jacks 30 are provided. The front outrigger jack 30 on the front side is disposed behind the front wheel 14 on the front side of the vehicle body 10. The rear outrigger jack 30 on the rear side is disposed behind the rear wheel 15 on the rear side of the vehicle body 10.

  As shown in FIG. 2, the outrigger jack 30 is supported by a jack frame 31 fixed to the subframe 13 and extending in the vertical direction, and an end on the cylinder rod side is supported on the upper end side of the jack frame 31 so as to be swingable in the width direction. A jack cylinder 32, a link member 33 whose one end is swingably supported at the lower end side of the jack frame 31 and whose other end is swingably supported by a cylinder tube of the jack cylinder 32, and a jack cylinder And a grounding plate 34 that is swingably supported at the end of the cylinder tube 32.

  As shown in FIG. 2, the outrigger jack 30 is in a retracted posture in which the jack cylinder 32 is slightly tilted so that the lower end side of the jack cylinder 32 is positioned on the inner side in the width direction of the vehicle body 10 from the upper end side when the jack cylinder 32 is fully reduced. It becomes. Further, when the jack cylinder 32 is fully extended, the outrigger jack 30 has a protruding posture that is inclined so that the lower end side of the jack cylinder 32 is positioned on the outer side in the width direction of the vehicle body 10 than the upper end side. The movement trajectory A of the ground plate 34 that is moved by the expansion and contraction operation of the jack cylinder 32 is a range in which the movement amount in the vertical direction is small and the movement amount in the width direction of the vehicle body 10 is large in the range where the overall length of the jack cylinder 32 is short. , The amount of movement in the vertical direction is large and the amount of movement in the width direction of the vehicle body 10 is small.

  The aerial work vehicle 1 also includes a controller 40 for controlling the operation of the outrigger jack 30.

  The controller 40 includes a CPU, a ROM, a RAM, and the like. When the controller 40 receives an input signal from a device connected to the input side, the CPU reads a program stored in the ROM based on the input signal, and stores a state detected by the input signal in the RAM. The output signal is transmitted to a device connected to the output side.

  On the input side of the controller 40, as shown in FIG. 3, the automatic extension switch 41 and the outrigger jack 30 are automatically stored for the operator to operate when the outrigger jack 30 is automatically extended. An automatic retracting switch 42 for an operator to operate when performing an operation, an inclination angle detector 43 as an inclination angle detecting means for detecting an inclination angle of the vehicle body 10 with respect to a horizontal plane, and an outrigger jack 30 on the left front side A left front jack ground detector 44a as a ground detection means for detecting a ground state, a right front jack ground detector 44b as a ground detection means for detecting a ground state of the right front outrigger jack 30, and a left rear side Left rear jack grounding detector 44c as grounding detection means for detecting the grounding state of the outrigger jack 30; A right rear jack ground detector 44d as a ground detection means for detecting the ground state of the rear outrigger jack 30 and a left front cylinder length detector 45a for detecting the extension / contraction length of the left front outrigger jack 30. A right front cylinder length detector 45b for detecting the expansion / contraction length of the right front outrigger jack 30 and a left rear cylinder length detector 45c for detecting the expansion / contraction length of the left rear outrigger jack 30. Are connected to a right rear cylinder length detector 45d for detecting the extension / contraction length of the right rear outrigger jack 30.

  Further, on the output side of the controller 40, as shown in FIG. 3, a left front cylinder control valve 46a for controlling the flow direction and flow rate of hydraulic oil to the jack cylinder 32 of the left front outrigger jack 30, and the right front side The control valve 46b for the right front cylinder for controlling the flow direction and flow rate of the hydraulic oil to the jack cylinder 32 of the outrigger jack 30 and the flow direction and flow rate of the hydraulic oil to the jack cylinder 32 of the left rear side outrigger jack 30 are controlled. The left rear cylinder control valve 46c is connected to the right rear cylinder control valve 46d for controlling the flow direction and flow rate of the hydraulic oil to the jack cylinder 32 of the right rear outrigger jack 30. .

  In the aerial work vehicle 1 configured as described above, when the automatic extension switch 41 is operated by the operator in a state where the outrigger jack 30 is in the retracted position, the outrigger jack 30 is extended to remove the vehicle body 10. Control the lifting operation of the jack. The operation of the CPU of the controller 40 at this time will be described using the flowchart of FIG.

(Step S1)
In step S1, the CPU determines whether or not the automatic extension switch 41 has been operated. If it is determined that the automatic extension switch 41 has been operated, the process proceeds to step S2, and if it is not determined that the automatic extension switch 41 has been operated, the jack extension operation control process is terminated.

(Step S2)
If it is determined in step S1 that the automatic extension switch 41 has been operated, in step S2, the CPU starts the extension operation of the jack cylinders 32 of all the outrigger jacks 30 and moves the process to step S3.

(Step S3)
In step S3, the CPU determines whether or not the jack cylinders 32 of all the outrigger jacks 30 have a predetermined length set in advance. If it is determined that the jack cylinder 32 has reached the predetermined length, the process proceeds to step S4. If it is not determined that the jack cylinder 32 has reached the predetermined length, the process of step S3 is repeated.
Here, whether or not the jack cylinder 32 has reached a predetermined length is determined for each of the four jack cylinders 32. In addition, the predetermined length set in advance for each jack cylinder 32 is a length that is a predetermined position before the ground plate 34 provided on the lower end side of the jack cylinder 32 contacts the ground G as shown in FIG. It is. At this time, a gap C having a size slightly larger than the thickness of the floor plate B is provided between the ground plate 34 and the ground G. Further, the dimension of the gap C can be changed by setting.

(Step S4)
If it is determined in step S3 that the jack cylinder 32 has reached the predetermined length set in advance, in step S4, the CPU stops the extension operation of the jack cylinder 32 and moves the process to step S5.
Here, the expansion / contraction operation of the jack cylinder 32 is stopped at the timing of each of the four jack cylinders 32. In addition, after the jack cylinder 32 is stopped, the operator inserts the floor plate B into the gap between the ground plate 34 and the ground G with respect to each jack cylinder 32 as shown in FIG.

(Step S5)
In step S5, the CPU determines whether or not the automatic extension switch 41 has been operated. If it is determined that the automatic extension switch 41 has been operated, the process proceeds to step S6. If it is not determined that the automatic extension switch 41 has been operated, the process of step S5 is repeated.

(Step S6)
When it is determined in step S5 that the automatic extension switch 41 has been operated, in step S6, the CPU starts the extension operation of the jack cylinder 32 of the left front side and right front side outrigger jacks 30 and moves the process to step S7. .
Here, even if the jack cylinder 32 of the left front side and right front side outrigger jacks 30 extends and the front side of the vehicle body 10 is lifted, the rear wheel 15 is grounded. Since the rotation of the rear wheel 15 is restricted by the parking brake, the vehicle body 10 will not run away.

(Step S7)
In step S7, the CPU determines whether or not the ground plates 34 of the left rear side and right rear side outrigger jacks 30 are grounded. If it is determined that the ground plates 34 of the left rear side and right rear side outrigger jacks 30 are grounded, the process proceeds to step S8, and the ground plates 34 of the left rear side and right rear side outrigger jacks 30 are grounded. If not, the process in step S7 is repeated.
Here, whether or not the ground plates 34 of the left rear side and right rear side outrigger jacks 30 are grounded is determined for each of the two jack cylinders 32. The left rear side and right rear side outrigger jacks 30 are located behind the rear wheel 15 in the vehicle body 10. Therefore, when the left front side and right front side outrigger jacks 30 are extended and the front side of the vehicle body 10 is lifted, the vehicle body 10 is tilted rearward and the left rear side and right rear side outrigger jacks as shown in FIG. 30 ground plates 34 are grounded.

(Step S8)
When it is determined in step S7 that the ground plates 34 of the left rear and right rear outrigger jacks 30 are grounded, in step S8, the CPU stores the inclination angle θ1 in the front-rear direction of the vehicle body 10 at this time (inclination). The process proceeds to step S9.

(Step S9)
In step S <b> 9, the CPU determines whether or not the jack cylinder 32 of the left front and right front outrigger jacks 30 has been fully extended. If it is determined that the jack cylinder 32 of the left front and right front outrigger jacks 30 is fully extended, the process proceeds to step S10, and the jack cylinder 32 of the left front and right front outrigger jacks 30 is fully extended. If it is not determined that the state has been reached, step S9 is repeated.
Here, it is determined for each of the two jack cylinders 32 whether or not the jack cylinders 32 of the left front and right front outrigger jacks 30 are fully extended. When the left front and right front outrigger jacks 30 are fully extended, the vehicle body 10 is lifted at the rear by the left rear and right rear outrigger jacks 30 as shown in FIG. Leave G.

(Step S10)
When it is determined in step S9 that the jack cylinders 32 of the left front and right front outrigger jacks 30 are fully extended, in step S10, the CPU extends the jack cylinder 32 of the left front and right front outrigger jacks 30. The operation is stopped and the process proceeds to step S11.
Here, the extension operation of the jack cylinder 32 of the left front and right front outrigger jacks 30 is stopped at the timing of each of the two jack cylinders 32.

(Step S11)
In step S11, the CPU starts the extension operation of the jack cylinder 32 of the left rear side and right rear side outrigger jacks 30 and moves the process to step S12.
Here, since the jack cylinders 32 of the left rear side and right rear side outrigger jacks 30 that start the extension operation extend to a long range before the grounding, the grounding plate 34 moves in the vertical direction. The movement amount in the width direction of the vehicle body 10 is small.

(Step S12)
In step S12, the CPU determines whether or not the jack cylinder 32 of the left rear side and right rear side outrigger jacks 30 has been fully extended. When it is determined that the jack cylinders 32 of the left rear side and right rear side outrigger jacks 30 are fully extended, the process proceeds to step S13, and the jack cylinders 32 of the left rear side and right rear side outrigger jacks 30 are moved. If it is not determined that has been fully extended, step S12 is repeated.
Here, whether or not the jack cylinders 32 of the left rear side and right rear side outrigger jacks 30 are fully extended is determined for each of the two jack cylinders 32. When all the outrigger jacks 30 are fully extended, the vehicle body 10 is supported by all the outrigger jacks 30 and is held in a posture in which the longitudinal direction of the vehicle body 10 extends in the horizontal direction as shown in FIG. .

(Step S13)
If it is determined in step S12 that the jack cylinders 32 of the left rear side and right rear outrigger jacks 30 are fully extended, in step S13, the CPU jacks the left rear side and right rear side outrigger jacks 30. The extension operation of the cylinder 32 is stopped and the jack extension operation control process is terminated.
Here, the extension operation of the jack cylinder 32 of the left rear side and right rear side outrigger jacks 30 is stopped at the timing of each of the two jack cylinders 32.

  Further, when the outrigger jack 30 is in the extended position shown in FIG. 10, when the operator operates the automatic storage switch 42, the jack storage operation control means for storing the outrigger jack 30 and grounding the vehicle body 10 is performed. The jack storage operation control process is performed. The operation of the CPU of the controller 40 at this time will be described using the flowchart of FIG.

(Step S21)
In step S21, the CPU determines whether or not the automatic storage switch 42 has been operated. If it is determined that the automatic storage switch 42 has been operated, the process proceeds to step S22. If it is not determined that the automatic storage switch 42 has been operated, the jack storage operation control process is terminated.

(Step S22)
If it is determined in step S21 that the automatic storage switch 42 has been operated, in step S22, the CPU starts the reduction operation of the jack cylinder 32 of the left rear side and right rear side outrigger jacks 30, and the process proceeds to step S23. Move.

(Step S23)
In step S23, the CPU determines whether or not the tilt angle θ in the front-rear direction of the vehicle body 10 is equal to or greater than the tilt angle θ1 stored in step S8 of the jack storage operation control process. If it is determined that the front-rear direction tilt angle θ of the vehicle body 10 is equal to or greater than the tilt angle θ1, the process proceeds to step S24, and it is determined that the front-rear direction tilt angle θ of the vehicle body 10 is equal to or greater than the stored tilt angle θ1. If not, the process in step S23 is repeated.

(Step S24)
If it is determined in step S23 that the front-rear direction tilt angle θ of the vehicle body 10 is equal to or greater than the stored tilt angle θ1, the CPU reduces the jack cylinder 32 of the left rear side and right rear side outrigger jacks 30 in step S24. The operation is stopped and the process proceeds to step S25.
Here, the reduction operation of the jack cylinder 32 of the left rear side and the right rear side outrigger jack 30 is stopped at the timing of each of the two jack cylinders 32.

(Step S25)
In step S25, the CPU determines whether or not the automatic storage switch 42 has been operated. If it is determined that the automatic storage switch 42 has been operated, the process proceeds to step S26. If it is not determined that the automatic storage switch 42 has been operated, the process of step S25 is repeated.

(Step S26)
When it is determined in step S25 that the automatic extension switch 41 has been operated, in step S26, the CPU starts the reduction operation of the jack cylinders 32 of all outrigger jacks 30 and moves the process to step S27.
Here, since the jack cylinders 32 of the left rear side and right rear side outrigger jacks 30 that start the reduction operation are in a long length range, the ground plate 34 has a large amount of vertical movement, and the width direction of the vehicle body 10 is large. The moving amount is small. In this state, by reducing the jack cylinders 32 of all the outrigger jacks 30, the rear wheel 15 is grounded, the front side of the vehicle body 10 is lowered, and the rear side of the vehicle body 10 is lowered. The ground plate 34 of the outrigger jack 30 is separated from the ground G.

(Step S27)
In step S27, the CPU determines whether or not the jack cylinders 32 of all the outrigger jacks 30 have been fully reduced. When it is determined that the jack cylinders 32 of all the outrigger jacks 30 are in the fully contracted state, the process proceeds to step S28, and it is not determined that the jack cylinders 32 of all the outrigger jacks 30 are in the fully contracted state. In that case, the process of step S27 is repeated.
Here, the determination as to whether or not the jack cylinder 32 has been fully reduced is performed for each of the four jack cylinders 32.

(Step S28)
If it is determined in step S27 that the jack cylinders 32 of all the outrigger jacks 30 have been fully reduced, the CPU stops the reduction operation of the jack cylinders 32 of all the outrigger jacks 30 in step S28 and performs the jack storage operation. The control process ends.
Here, the reduction operation of the jack cylinder 32 is stopped at the timing of each of the four jack cylinders 32.

  Thus, according to the outrigger jack operation control device for a work vehicle of this embodiment, the vehicle body 10 is grounded after the rear wheel 15 of the vehicle body 10 is grounded from the state in which the vehicle body 10 is lifted by projecting the plurality of outrigger jacks 30. When performing the jack storing operation of storing the outrigger jacks 30 with the front wheels 14 in contact with the ground, the front-rear direction inclination angle θ of the vehicle body 10 is set to a predetermined inclination angle θ1, and all the outrigger jacks 30 are set. The jack cylinder 32 is reduced.

  Thus, when the rear wheel 15 of the vehicle body 10 is grounded, the ground plate 34 of the outrigger jack 30 is separated from the ground G by the expansion / contraction operation of the jack cylinder 32 in which the movement amount of the vehicle body 10 in the width direction is small. Therefore, it is possible to reduce the amount of sliding of the ground plate 34 with respect to the ground G, and it is possible to prevent the ground G from being damaged or disturbed.

  In addition, a tilt angle detector 43 for detecting the tilt angle of the vehicle body 10 with respect to the horizontal plane is provided. Only the jack cylinder 32 of the outrigger jack 30 on the rear side of the vehicle body 10 is reduced, and the vehicle body detected by the tilt angle detector 43 is detected. When the inclination angle θ in the front-rear direction of 10 becomes a predetermined inclination angle θ1, the jack cylinders 32 of all the outrigger jacks 30 are reduced.

  As a result, the inclination angle θ in the front-rear direction of the vehicle body 10 can be set to the predetermined inclination angle θ1 based on the detection result of the inclination angle detector 43, so that the posture of the vehicle body 10 can be controlled with a simple configuration. Is possible.

  In addition, the predetermined inclination angle θ1 of the vehicle body 10 is such that when only the jack cylinder 32 of the outrigger jack 30 provided on the front side of the vehicle body 10 is extended in the jack extension operation, the outrigger provided on the rear side of the vehicle body 10 is used. This is the inclination angle of the vehicle body 10 in the front-rear direction when the jack cylinder 32 of the jack 30 is grounded.

  Thereby, in the jack extension operation, the inclination angle of the vehicle body 10 with a small slip amount of the ground plate 34 with respect to the ground G can be used for the jack storage operation, and the jack extension operation with a small amount of slip with respect to the ground G with a simple configuration. And jack storage operation can be performed.

  In the jack extension operation, when only the outrigger jack 30 provided on the front side of the vehicle body 10 is extended, the left rear jack ground detector 44c and the right rear jack ground detector 44d are provided on the rear side of the vehicle body 10. The inclination angle θ1 of the vehicle body 10 at the time when the ground contact of the outrigger jack 30 is detected is stored.

  As a result, the jack storage operation can be performed at an optimum inclination angle of the vehicle body 10 according to the unevenness or inclination state of the ground G at the place where the aerial work vehicle 1 is installed. The amount can be reduced.

  In the above embodiment, the tilt angle of the vehicle body 10 is obtained by the tilt angle detector 43 for detecting the tilt angle of the vehicle body 10 with respect to the horizontal plane. However, the present invention is not limited to this. . For example, the lengths of the four jack cylinders 32 are set as the left front cylinder length detector 45a, the right front cylinder length detector 45b, the left rear cylinder length detector 45c, and the right rear cylinder length as jack length detection means. It is also possible to acquire a predetermined inclination angle θ1 of the vehicle body 10 based on the length of each jack cylinder 32 detected by the detector 45d. In this case, the inclination angle detector 43 is not required in the jack extension operation and the jack storage operation.

  Moreover, although the aerial work vehicle 1 in which the aerial work device 20 is provided in the vehicle body 10 is shown as an example of the work vehicle in the embodiment, the present invention is not limited to this. Any work vehicle having a link-type outrigger jack provided on the vehicle body may be used. For example, a crane vehicle having a crane device provided on the vehicle body may be used.

  Further, in the above-described embodiment, the rear wheel 15 whose rotation can be restricted by the parking brake is preferentially grounded in the jack storing operation to prevent the runaway. However, the present invention is not limited to this. When rotation of only the front wheel 14 is restricted by the parking brake, the front wheel 14 may be grounded preferentially in the jack storing operation.

  DESCRIPTION OF SYMBOLS 1 ... Aerial work vehicle, 10 ... Car body, 14 ... Front wheel, 15 ... Rear wheel, 20 ... High work device, 30 ... Outrigger jack, 32 ... Jack cylinder, 34 ... Ground plate, 40 ... Controller, 42 ... Automatic storage Switch, 43 ... Inclination angle detector, 44a ... Left front jack ground detector, 44b ... Right front jack ground detector, 44c ... Left rear jack ground detector, 44d ... Right rear jack ground detector, 45a ... Left front cylinder length detection 45b ... right front cylinder length detector, 45c ... left rear cylinder length detector, 45d ... right rear cylinder length detector.

Claims (5)

A plurality of link-type outrigger jacks that are provided on both front and rear sides of a vehicle body having traveling wheels, projecting diagonally downward toward the outside in the width direction of the vehicle body, and supporting the vehicle body;
When retracting a plurality of outrigger jacks from a state where the plurality of outrigger jacks are extended and the vehicle body is lifted, the one wheel in the front-rear direction of the vehicle body is grounded and the other wheel in the front-rear direction of the vehicle body is Jack storage operation control means for performing jack storage operation to be grounded, and
An outrigger jack operation control device for a work vehicle, wherein the jack storage operation control means reduces all outrigger jacks after setting the inclination angle in the longitudinal direction of the vehicle body to a predetermined inclination angle set in advance. Inclination angle detection means for detecting the inclination angle of the vehicle body relative to the horizontal plane,
The jack storing operation control means reduces only the outrigger jack on one side in the front-rear direction of the vehicle body, and from the state where the inclination angle detection means detects that the inclination angle in the front-rear direction of the vehicle body is a predetermined inclination angle. The outrigger jack operation control device for a work vehicle according to claim 1, wherein the outrigger jack is reduced. Comprising jack length detecting means for detecting the extension / contraction length of each of the plurality of outrigger jacks;
The jack storing operation control means reduced all the outrigger jacks, and the extension length of each outrigger jack detected by the jack length detection means became the extension length that makes the vehicle body a predetermined inclination angle in the front-rear direction. The outrigger jack operation control device for a work vehicle according to claim 1, wherein all outrigger jacks are reduced from a state. The outrigger jack provided on the rear side of the vehicle body is arranged behind the wheel on the rear side of the vehicle body,
The jack extension operation of projecting a plurality of stored outrigger jacks to support the vehicle body is performed after all the outrigger jacks are projected downward and stopped at a predetermined position before the lower end of each outrigger jack is grounded. The operation is to extend only the outrigger jack provided on the front side of the vehicle body, fully extend the front outrigger jack, and then fully extend the rear outrigger jack,
The predetermined inclination angle of the vehicle body is determined in the longitudinal direction of the vehicle body when the outrigger jack provided on the rear side of the vehicle body is grounded when only the outrigger jack provided on the front side of the vehicle body is extended in the jack extension operation. The outrigger jack operation control device for a work vehicle according to any one of claims 1 to 3, wherein the operation angle is an inclination angle. A grounding detection means for detecting a state in which each lower end of the plurality of outrigger jacks is grounded;
In the jack extension operation, when only the outrigger jack provided on the front side of the vehicle body is extended, the inclination angle of the vehicle body at the time when the ground detection means detects the contact of the outrigger jack provided on the rear side of the vehicle body is stored. An outrigger jack operation control device for a work vehicle according to claim 4, comprising an inclination angle storage unit.

Images