JP2003165696A - Jack operation controller for work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jack operation controller for a work vehicle providing safe jack installation irrespective of a situation of a road or a work site when carrying out protruding work of a jack lifting and supporting a vehicle body. <P>SOLUTION: In jack installation, when a detected value detected by a body inclination sensor 21 is a predetermined angle or more and operation of an auxiliary braking device 24 braking and holding a front wheel 3a and a rear wheel 3b is detected by an auxiliary braking device braking sensor 25, the jack operation controller 20 determines an operation order of the jack in response to the detected value of the body inclination sensor 21 and it controls operation so that a front jack cylinder 10a and a rear jack cylinder 11a are protruded according to the order. A worker has only to operate a jack automatic switch 26. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle having a front wheel and a rear wheel, which is capable of traveling, and a plurality of jacks for lifting and supporting the vehicle body adjacent to the front and rear wheels. , A device for controlling the operation of the plurality of jacks.

[0002]

2. Description of the Related Art For example, there is an aerial work vehicle as the work vehicle. In a work vehicle such as an aerial work vehicle, generally, left and right jacks are provided in front of and behind the vehicle body, and in order to secure the stability of the vehicle body during work, it is generally configured to extend the jack to lift and support the vehicle body. Are known. In such a work vehicle, either the front wheel or the rear wheel (usually the rear wheel) is braked by the parking brake, and when the jack is extended and the vehicle body is lifted and supported, the rear wheel, etc. Extend the jack while braking and stopping.

When extending the jack in this way,
If the rear wheel side braked by the parking brake is lifted up and supported by the jack first, the front part of the vehicle body will be supported by the unbraked front wheel, and the rear wheel side jack will be moved first on slopes such as slopes. If it is extended, only the front wheel in the non-braking state will come into contact with the ground and rotate, which may cause the vehicle to arbitrarily move along the slope.

For this reason, when the work vehicle is parked on an inclined ground for work, the vehicle body is parked so that the vehicle is lowered downward and the parking brake is operated to brake and hold the rear wheels, and then the vehicle is lowered first. Extend the front jack. At this time, since the rear wheels braked and held by the parking brake remain in contact with the ground, there is no concern that the vehicle body will start running. Next, the rear jack is appropriately extended. As a result, the vehicle body can be safely supported even on a sloping ground in a state where the vehicle body is close to the horizontal.

[0005]

By the way, when a work vehicle is parked on a sloping ground as described above, it is necessary to park the vehicle so that the vehicle body is lowered forward. For example, the situation of a one-way road or a work site. Therefore, it may be difficult to stop the vehicle unless the vehicle body is raised forward. in this case,
Either the use of the work vehicle as described above must be stopped, or the extension jack must be extended to raise the elevated front jack, and the rear jack must be extended in an extremely unstable situation. There was a problem. Furthermore, if the rear jack, which is lowered by mistake, is extended first, the rear wheels will be lifted first, so the front wheels without brakes will support the vehicle body, and the front wheels will rotate freely and the vehicle body will start to slide. There was a fear.

The present invention has been made in view of the above problems, and provides a jack operation control device for a work vehicle capable of safely installing a jack regardless of the situation of the road or the work site. It is intended to be provided.

[0007]

In order to achieve the above object, the present invention provides a vehicle body having front wheels and rear wheels and capable of traveling, and a vehicle body provided adjacent to each of the front wheels and rear wheels. A jack operation control device for a working vehicle, comprising a plurality of jacks for lifting and supporting, and an auxiliary braking device for braking both front and rear wheels, wherein a vehicle body inclination angle detecting means for detecting an inclination angle of a vehicle body (for example, the present embodiment). The vehicle body inclination angle sensor 21) in the example, the auxiliary braking device braking detection means (for example, the auxiliary braking device braking sensor 25 in the present embodiment) that detects the operation of the auxiliary braking device that brakes both the front wheel and the rear wheel, and the jack. A jack actuating actuator (for example, the front jack cylinder 10a and the rear jack cylinder 11a in this embodiment) for performing the operation and the vehicle body inclination angle detecting means. When the detected value detected is equal to or greater than a predetermined value and the operation of the auxiliary braking device is detected by the auxiliary braking device braking detection means, the operation sequence of the jacks is determined according to the detected value of the vehicle body tilt angle detection means. And a controller for controlling the operation of the jack operation actuator so as to operate the jack based on the operation sequence thus determined.

According to the jack operation control device constructed as described above, when all the front and rear wheels are braked by the auxiliary braking device, it is determined according to the longitudinal inclination of the vehicle body detected by the vehicle body inclination angle detecting means. The installation work of the jack is performed based on the operation sequence of the jack. For this reason, during the installation operation of the jack, the braking force is secured to all the front and rear wheels to the end, so that the vehicle can be reliably prevented from running away, and the burden on the operator to pay attention to the parking direction and the operation of the jack is reduced. Further, since the jack can be operated regardless of the road condition and the situation at the site, the working vehicle can be used in a wider range.

Further, the controller is set so as to determine the operation order of the jacks so that the jacks located on the lower side of the inclination are projected first based on the inclination angle of the vehicle body detected by the vehicle body inclination angle detecting means. Is desirable. As a result, the operator does not have to worry about the order of operation of the jacks, and the work efficiency can be improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. An aerial work vehicle 1 using the jack operation control device 20 according to the present invention is shown in FIG. This aerial work vehicle 1 has a driving cabin 2a at the front of a vehicle body 2, and a pair of front wheels 3a and a pair of rear wheels 3b arranged in the left-right direction at the lower part of the driving cabin 2a and the rear portion of the vehicle body 2. Is provided. These pair of front wheels 3a
Is rotatable, and the pair of rear wheels 3b is connected to the driving cabin 2a.
It is provided so that braking can be performed by operating the parking brake 13 provided therein. The parking brake 13 is operated by the driver, and only the rear wheel 3b is braked by the lever operation. However, once the lever operation is performed, the parking brake 13 is held in the braking state unless it is released.

A front jack 10 is arranged on the rear side of the pair of front wheels 3a, and a rear jack 1 is arranged on the rear side of the pair of rear wheels 3b.
1 is provided. The front jack 10 includes a front jack cylinder 10a, and the rear jack 11 includes a rear jack cylinder 11a. When the front jack cylinder 10a and the rear jack cylinder 11a extend and retract, the front jack 10 and the rear jack 11 are moved. It is configured to expand and contract.

On a vehicle body 2, a revolving base 4 which is driven by a revolving motor (hydraulic motor) (not shown) and is horizontally rotatable is disposed. A base 5 is pivotally connected to the swivel 4 and a boom 5 is attached to the swivel 4.
Is moved up and down by the up-and-down cylinder 6. The boom 5 is configured to be telescopically movable by a built-in telescopic cylinder 7 by combining a base end boom 5a, an intermediate boom 5b and a tip boom 5c in a telescopic manner.

The tip boom 5c has a boom head 5d at its tip.
And a supporting member 8 which is pivotally connected to the boom head 5d.
Is mounted so that it can swing up and down. The support member 8 has a vertical post portion (not shown), and the boom head 5
The swinging control of the support member 8 is performed by a leveling cylinder (not shown) arranged between the d and the support member 8, and the vertical post portion always extends vertically regardless of the ups and downs of the boom 5. The support member 8 is swing-controlled so as to operate. As described above, the workbench 9 is attached to the vertical post portion which is always held vertically so as to be horizontally rotatable (swingable), and the workbench 9 is always held horizontally regardless of the ups and downs of the boom 5.

Since the above-mentioned undulating cylinder 6, telescopic cylinder 7, front jack cylinder 10a and rear jack cylinder 11a are driven by using hydraulic pressure, the output from the engine E is output to the front part of the vehicle body 2. Power take-off (not shown) that drives a hydraulic pump P by taking out a part of
Is attached.

A power take-off switch (not shown) for operating the power take-off, that is, for driving or stopping the hydraulic pump P, is provided in the operating cabin 2a.
It is installed inside the driver's seat. The driving of the hydraulic pump P is not limited to the one using the power take-off (not shown) as described above, but an engine (for example, a low noise unit or the like) provided independently on the vehicle body 2 is called. The hydraulic pump P may be driven by a power unit).

A jack operating device 15 for manually operating the driving of the front jack 10 and the rear jack 11 is provided at the rear end of the vehicle body 2. Jack operating device 15
3 is provided between a pair of tail lamps 16 provided at the rear end of the vehicle body 2 as shown in FIG.
It has book operating levers 15a, 15b, 15c, and 15d. A left front operating lever 15a for operating the front jack 10 on the left side of the vehicle body from the left side, a left rear operating lever 15b for operating the rear jack 11 on the left side of the vehicle body, a right front operating lever 15c for operating the front jack 10 on the right side of the vehicle body, and a right side of the vehicle body A rear rear operation lever 15d for operating the rear jack 11 is provided. Operating levers 15a, 15b, 15
c and 15d are tiltable in the front-back direction of the vehicle body 2, and when tilted forward, the front jack 10 and the rear jack 11
Is extended and the front jack 10 and the rear jack 11 are reduced when the tilting operation is performed rearward.
Further, when the operating levers 15a, 15b, 15c and 15d are in the non-operated state, they are automatically returned to the vertical neutral position. The operation panel 17 of the jack operation device 15 is provided with an automatic extension switch 26a and an automatic storage switch 26b which will be described later.

The aerial work vehicle 1 constructed in this manner lifts and stably supports the vehicle body 2 by the front jack cylinder 10a and the rear jack cylinder 11a during work at a high place. Therefore, a jack control device 20 for controlling the front jack cylinder 10a and the rear jack cylinder 11a is provided.

As shown in FIG. 1, the jack operation control device 20 includes a vehicle body inclination angle sensor 21 and a front ground contact sensor 2.
2, rear ground sensor 23, auxiliary braking device 24, auxiliary braking device braking sensor 25, jack automatic operation switch 2
6 and a controller 30.

The vehicle body inclination angle sensor 21 has a function of detecting an inclination angle of the vehicle body 2 in the front-rear direction shown in FIG. The vehicle body inclination angle sensor 21 can also have a function of detecting the inclination angle of the vehicle body 2 in the left-right direction. The front ground sensor 22 detects whether the lower ends of the pair of front jacks 10 are in the grounded state, and the rear ground sensor 23 detects whether the lower ends of the pair of rear jacks 11 are in the grounded state. In addition,
The front ground sensor 23 and the rear ground sensor 24 detect the presence / absence of grounding by detecting the hydraulic pressure of the front jack cylinder 10a and the rear jack cylinder 11a.
Various methods are conceivable, but detailed description thereof is omitted here.

The auxiliary braking device 24 is operated by a driver sitting in the driver's seat in the driving cabin 2a depressing the pedal. When the pedal is depressed, both the front wheels 3a and the rear wheels 3b are braked and once the pedal is depressed. Unless this is released, the braking state is maintained. The auxiliary braking device braking sensor 25 has a function of detecting whether the auxiliary braking device 24 is operating, that is, whether both the front wheels 3a and the rear wheels 3b are in the braking state.

The automatic jack switch 26 comprises an automatic extension switch 26a for automatically extending the front jack 10 and the rear jack 11, and an automatic retracting switch 26b for automatically storing the front jack 10 and the rear jack 11. When the automatic extension switch 26a is pressed, an operation signal for extending the jack is transmitted to the controller 30, and when the automatic storage switch 26b is pressed, an operation signal for storing the jack is transmitted to the controller 30. .

The controller 30 has a jack operation sequence determining section 31 and an operation control section 32.

The jack operation sequence determining section 31 receives the operation signal transmitted from the jack automatic switch 26,
As shown in FIG. 4, first, based on the detection result of the auxiliary braking device braking sensor 25, it is determined whether the auxiliary braking device 24 is in the braking state, that is, whether the front wheels 3a and the rear wheels 3b are both brake-held. (Step S1). If it is determined that the vehicle is not in the braking state, this flow ends. When it is determined that the vehicle is in the braking state, it is determined whether or not the vehicle body is leaning based on the detection result of the vehicle body leaning angle sensor 21 (step S2). If it is determined that the vehicle body is tilted, it is confirmed whether the automatic extension switch 26a or the automatic extension switch 26b is pressed (step S3). If the automatic overhang switch 26a is pressed, it is determined that the overhang work of the jack is to be performed, and the process advances to step S10 to set the jack overhang order. If the automatic storage switch 26b is pressed, it is determined that the jack storing operation is to be performed, and the process proceeds to step S20 to set the jack storing order.

To set the jack swelling order, as shown in FIG. 5, the vehicle body inclination angle sensor 21 determines whether or not the vehicle body is descending forward (step S11). If the vehicle is falling frontward, the front jack 10 is first overhanged, the vehicle body 2 is leveled (at this time, the rear wheel 3b remains grounded), and the rear jack 11 is grounded. Then, the front jack 10 is maintained with the body 2 kept horizontal until the rear wheel 3b stops contacting the ground.
Then, the operation order is determined so that four rear jacks 11 are simultaneously projected (step S12), and the contents thereof are transmitted to the operation control unit 32. If it is not the front descent, the rear jack 11 is first overhanged to make the vehicle body 2 horizontal (the front wheel 3a remains grounded at this time) and the front jack 10 is grounded. Then, until the front wheel 3a stops contacting the ground, the vehicle body 2
The operation order is determined so that the four front jacks 10 and the four rear jacks 11 are simultaneously projected while keeping the horizontal state (step S13), and the content is transmitted to the operation control unit 32.

To set the jack storage order, as shown in FIG. 6, the vehicle body tilt angle sensor 21 determines whether or not the vehicle body is in the front descent (step S21). If the vehicle is descending to the front, first hold the vehicle body 2 horizontally and then use the front jack 1
0 and rear jack 11 are reduced at the same time, and rear wheel 3b
When is grounded, the rear jack 11 is retracted. Then, the front jack 10 is stored, the operation order is determined so that the front wheels 3a are grounded (step S22), and the content is transmitted to the operation control unit 32. If it is not the front descent, first the car body 2
While holding 4 horizontally, the front jack 10 and the rear jack 11 are simultaneously reduced, and when the front wheel 3a comes into contact with the ground, the front jack 10 is stored. Subsequently, the rear jack 11 is stored, the operation order is determined so that the rear wheel 3b is grounded (step S23), and the content is transmitted to the operation control unit 32.

On the other hand, in step S2 shown in FIG.
When the vehicle body is not tilted, that is, when it is determined that the vehicle body is in the horizontal state, it is confirmed whether the automatic extension switch 26a or the automatic storage switch 26b is pressed (step S4). If the automatic overhanging switch 26a is pressed, it is determined that the overhanging work of the jack is to be performed,
In step S30, the operation order is determined so that four front jacks 10 and four rear jacks 11 are simultaneously projected while the vehicle body 2 is held horizontally.
Send to 2. Further, when the automatic storage switch 26a is pressed, it is determined that the storage operation of the jack is to be performed, and the process proceeds to step S40, in which the front jack 10 and the rear jack 11 are stored at the same time while keeping the body 2 horizontal. The operation order is determined, and the content is transmitted to the operation control unit 32.

The operation control section 32 operates the hydraulic control valve 40 which controls the supply and discharge of the hydraulic oil supplied by the hydraulic pump P in accordance with the operation order thus determined by the jack operation order determination section 31. Control is performed to control the operation of the front jack cylinder 10a and the rear jack cylinder 11a.

A description will be given of a case where the jack operation control device 20 of the present invention having the above-mentioned configuration is used to perform the jack projecting work and the jack storing work. First, the jack overhanging work will be described.

As shown in FIG. 7 (a), the projecting work of the jack is performed by the boom 5, the front jack 10 and the rear jack 11.
The aerial work vehicle 1 in which the vehicle is stored in the vehicle body 2 is moved to and stopped on the slope 50 having the inclination angle θ that inclines rearward. Then, an operator (not shown) actuates the parking brake 13 of the driving cabin 2a to hold the rear wheel 3b in a braking state, and switches a power take-off switch (not shown) to the pump drive side, and an auxiliary braking device. By depressing 24, the front wheels 3a and the rear wheels 3b are held in a braking state. Then, the operator operates the automatic extension switch 26a provided on the rear side of the vehicle body 2.

In the vehicle body 2, first, as shown in FIG. 7 (b), the rear jack cylinder 11a is extended to lift and support the rear portion of the vehicle body 2 until the vehicle body 2 becomes horizontal. At this time, only the front wheel 3a is in the grounded state, but the auxiliary braking device 24
Since the work vehicle 1 is braked and held by, the work vehicle 1 does not move backward and enter a runaway state. Next, as shown in FIG. 7C, the front jack cylinder 10 a is extended and actuated to ground the front jack 10 on the slope 50. And the front wheel 3a
The front jack 10 and the rear jack 11 are simultaneously extended and operated while the vehicle body 2 is held horizontally until is not in contact with the slope 50. As a result, the entire vehicle body is lifted and supported as shown in FIG.

As described above, when the jack is to be extended on the sloping ground 50 which is inclined to the rear of the vehicle body 2, the operator simply operates the automatic extension switch 26a, and the auxiliary braking device 24 grounds to the end. A braking force is secured for the front wheels 3a, and in order to reduce the inclination angle of the vehicle body 2 as much as possible, the front wheels 3a are controlled to project from the rear jack 11a on the downhill side. As a result, the projecting work of the jack can be easily and safely performed regardless of the conditions of the road and the work site.

As shown in FIG. 7D, the front jack 10 and the rear jack 11 are projected on the slope 50 having the inclination angle θ and the vehicle body 2 is lifted and supported. When carrying out the jack storing operation from the state in which the automatic storing switch 26b is in the open state, the automatic storing switch 26b is operated. Then, the work of projecting the jack is completely reversed, and the front jack 10a and the rear jack 11 are stored as shown in FIG. 7 (a).

As described above, when carrying out the work for retracting the jack on the sloping ground 50 which is inclined rearward of the vehicle body 2, the operator only operates the jack automatic switch 26, and the front wheel which is grounded to the end by the auxiliary braking device 24. The braking force is secured in 3a, and in order to reduce the inclination angle of the vehicle body 2 as much as possible, the front jack 11a on the slope upper side is stored. As a result, the jack can be stored easily and safely regardless of the conditions of the road and work site.

As described above, when the work vehicle for aerial work is parked on the sloping ground 50 and the jack is extended or retracted, the operator simply operates the jack automatic switch 26 and the auxiliary braking device 24 is operated. As a result, the braking force is secured to the wheels that are grounded to the end and the operation of the jack is also performed automatically, so that the operator does not have to worry about the parking direction or worry about the operation sequence of the jack. Therefore, the burden on the worker is reduced, the range of use of the work vehicle is expanded, and a vehicle runaway accident can be prevented.

Further, the controller 30 detects the inclination in the front-rear direction by the vehicle body inclination angle sensor 21 to reduce the inclination of the vehicle body. Therefore, when the jack is extended, the jack is extended from the downhill side. Determine the operating order of the jacks. For this reason, the operator does not have to pay attention to the operation order of the jacks, so that the working efficiency can be improved.

The aerial work vehicle 1 thus constructed
In, the jack installation work can be performed on the sloping ground using only the parking brake 13. However, to prevent the vehicle from running away, be sure to park the work vehicle 1 in the front
Overhang work is performed from the front jack 10.

[0037]

As described above, according to the jack operation control device for a working vehicle of the present invention, when the detection value detected by the vehicle body tilt angle sensor is equal to or more than the predetermined value, the auxiliary braking device assists the braking detection sensor. When the operation of the braking device is detected, the operation order of the jacks is determined according to the inclination of the vehicle body, and the operation of the jacks is performed. Therefore, since the vehicle can be parked on a slope regardless of the direction of the work vehicle, the burden on the worker is reduced and the range of use of the work vehicle is expanded. In addition, a vehicle runaway accident can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a jack operation control device according to the present invention.

FIG. 2 is a side view of an aerial work vehicle equipped with the jack operation control device according to the present invention.

FIG. 3 is a perspective view of a jack automatic operation switch according to the present invention.

FIG. 4 is a flowchart for explaining control contents of the jack operation control device according to the present invention.

FIG. 5 is a flowchart for explaining the control content of the jack operation control device according to the present invention.

FIG. 6 is a flowchart for explaining control contents of the jack operation control device according to the present invention.

FIG. 7 is a diagram for explaining the operation of the jack operation control device according to the present invention.

[Explanation of symbols]

1 aerial work vehicle 2 vehicle body 3a front wheel 3b rear wheel 10 front jack 10a front jack cylinder (actuating actuator) 11 rear jack 11a rear jack cylinder (actuating actuator) 20 jack operation control device 21 vehicle body inclination angle sensor (vehicle body inclination angle detecting means) ) 24 auxiliary braking device 25 auxiliary braking device braking sensor (auxiliary braking device braking detection means) 30 controller

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tsutomu Hojo             1015 1152 Yamashita, Ryoke, Ageo City, Saitama Prefecture               Aichi Corporation Ageo Kogyo             Inside the hall (72) Inventor Shinya Ishii             1015 1152 Yamashita, Ryoke, Ageo City, Saitama Prefecture               Aichi Corporation Ageo Kogyo             Inside the hall F term (reference) 3F333 AA08 CA15 DA10 DB10 FA10                       FD07 FD20

Claims (2)

[Claims] 1. A vehicle body having front and rear wheels capable of traveling, a plurality of jacks provided adjacent to the front wheels and the rear wheels to lift and support the vehicle body, the front wheels and the rear wheels. A jack control device for a working vehicle, comprising: an auxiliary braking device that brakes both the vehicle and an auxiliary braking device that brakes both the front wheels and the rear wheels. When the detection value detected by the vehicle body tilt angle detection means is equal to or greater than a predetermined value, the auxiliary braking device braking detection means for detecting the When the operation of the auxiliary braking device is detected by the means, the operation order of the jacks is determined according to the detection value of the vehicle body inclination angle detection means. Work vehicle jack actuating the control apparatus characterized by based on the operating sequence that urchin determined and a controller for controlling operation of said jack actuating the actuator so as to achieve actuation of the jack. 2. The controller determines an operation sequence of the jacks so that the jacks located on the lower side of the inclination are projected first based on the inclination angle of the vehicle body detected by the vehicle body inclination angle detecting means. The jack operation control device for a work vehicle according to claim 1, wherein: