JPH0347010Y2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Industrial Application Field The present invention relates to an outrigger control device that enables the use of aerial work vehicles, crane vehicles, etc. even on slopes.

(2) Conventional technology Conventional outriggers generally have the same jacking stroke for the front and rear outriggers of the vehicle.
Although it is possible to hold the car body horizontally on a slight slope, it is impossible to hold the car body horizontally, making it impossible to hold the car body horizontally.

(3) Problems to be solved by the invention In order to enable work on slopes, the jacking stroke of the pair of outriggers installed on the front side of the car body is changed from that of the pair of outriggers installed on the rear side of the car body. If the length is longer than the jacking stroke, the vehicle body will tilt when the outriggers are installed at the full jacking stroke on flat ground, resulting in a problem of poor operability of the outriggers on flat ground.

(4) Means for solving the problem In order to solve the above problem, the present invention has been developed by changing the jacking stroke of the pair of outriggers installed on the front side of the car body to the jack stroke of the pair of outriggers installed on the rear side of the car body. A detector for detecting when the jacking stroke of a pair of outriggers on the front side of a vehicle body has become the same length as the jacking stroke of a pair of outriggers on the rear side of the vehicle; a regulating device that regulates the jacking operation of the pair of front outriggers based on a signal from the device;
It is equipped with a restriction release switch for canceling the operation of this restriction device.

(5) Effect With the above configuration, on flat ground, when the jacking length of the pair of outriggers on the front side of the vehicle body becomes the same length as the jacking stroke of the pair of outriggers on the rear side, the detector outputs an output and the regulation is activated. The device is activated to restrict the jacking operation, and on slopes, by operating the restriction release switch to release the regulating device, the jacking length of the pair of outriggers on the front side of the vehicle body can be adjusted to the length of the jacking of the pair of outriggers on the rear side. It can be made longer than the outrigger jacking stroke.

(6) Examples Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows an aerial work vehicle, in which a turntable 3 is placed on the top surface of the vehicle body 1.
The base of a telescopic boom 4 is pivotally supported by the telescopic boom 4. The telescopic boom 4 is raised and lowered by a hoisting cylinder 5, and is also extended and contracted by a built-in telescopic device (not shown).A workbench 6 is placed at the tip of the telescopic boom to maintain balance. There are outriggers 2a and 2 on the left and right front sides of the vehicle body 1.
b, outriggers 2c and 2d are provided on the left and right rear sides of the vehicle body 1, and outriggers 2c and 2d are provided on the front side.
A hydraulic cylinder with a long stroke is used to jack the front outriggers 2a and 2b.
The jack stroke is the rear outrigger 2c,
It is configured to be longer than the jack stroke of 2d.

The jack boxes of the front outriggers 2a, 2b are provided with detectors 7a, 7b for detecting when the jacking length of the front outriggers 2a, 2b has become the same as the jacking stroke of the rear outriggers 2c, 2d. each installed.

As shown in FIG. 2, the hydraulic circuit that operates the outriggers 2a, 2b, 2c, and 2d includes each direction switching valve 8 of an outrigger operation valve 8 connected to a pump 9.
1, 82, 83, 84 are front outriggers 2a,
2b jack cylinders 21, 22 and rear outriggers 2c, 2d jack cylinders 23, 2
connected to the bottom side and rod side of 4, respectively,
Each directional control valve 81, 82, 83, 84 and each cylinder 21, 22, 23, 24 is connected to a double pilot check valve 1 in each pipe line.
1, 12, 13, and 14 are inserted.

The bottom sides of the jack cylinders 21, 22 of the front outriggers 2a, 2b and the directional control valves 81, 82
Electromagnetic shut-off valves 15 and 16, which are regulating devices, are inserted between the directional control valves 81 and 82 and the double pilot check valves 11 and 12, respectively, in the pipes connecting the , 16 are respectively connected to limit switches 7a, 7b which are detectors attached to the jack boxes of the front outriggers 2a, 2b, and both limit switches 7a, 7b
is connected to a battery 18 via a deregulation switch 17 that cuts off power to the solenoids of the electromagnetic shut-off valves 15 and 16.

With the above configuration, when working on flat land, the restriction release switch 17 is held in the closed state, and the directional control valves 81 and 8 of the outrigger operation valve 8 are
By switching 2, 83, and 84 to the extension side,
Pressure oil discharged from the pump 9 is supplied to the bottom side of each jack cylinder 21 , 22 , 23 , 24 .
expands. Then, the front outriggers 2a, 2
The jacking length of b is the rear outrigger 2c, 2d.
When the length is equal to the jack stroke of
6 is switched and the supply of pressure oil to the cylinders 21 and 22 is cut off.
Even if the outriggers 1, 82, 83, and 84 are switched to the extended side, all outriggers 2
a, 2b, 2c, and 2d are stopped while being extended to the same length, and the vehicle body 1 is supported by the outriggers 2a, 2b, 2c, and 2d.

When working on a slope, stop the vehicle 1 with the front side facing downhill, hold the restriction release switch 17 in the closed state, and close the directional control valves 81, 82, 83, 84 of the outrigger operating valve 8. By switching to the extension side, each jack cylinder 2
Pressure oil discharged from the pump 9 is supplied to the bottom side of the cylinders 1, 22, 23, and 24, and each of the cylinders 21, 22, 23, and 24 expands. Even if the jacking length of the front outriggers 2a, 2b becomes the same length as the jacking stroke of the rear outriggers 2c, 2d, and the limit switches 7a, 7b, which are detectors, are activated and closed, the regulation Since the release switch 17 is open, the solenoids of the electromagnetic shut-off valves 15 and 16 are not energized, and the electromagnetic shut-off valves 15 and 16 are not switched, and pressure oil continues to be supplied to the jack cylinders 21 and 22. Therefore, as shown in FIG. 1, the front outriggers 2a, 2b extend longer than the rear outriggers 2c, 2d, and the vehicle body 1 is supported horizontally.

(7) Effects of the invention As described above, according to the invention, by operating the restriction release switch, on flat ground, the jacking length of the pair of outriggers on the front side of the vehicle body can be changed to the jacking length of the pair of outriggers on the rear side. On slopes, the jacking length of the pair of outriggers on the front side of the car body can be made longer than the jacking stroke of the pair of outriggers on the rear side. The outrigger has the effect that the jacking stroke of the outrigger provided on the rear side of the car body is longer than the jacking stroke of the outrigger provided on the rear side of the car body, in that the car body can be easily installed horizontally on a flat ground.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a side view of an aerial work vehicle with outriggers installed on a slope, Fig. 2 is a hydraulic and electrical circuit diagram showing the configuration of the control device, and Fig. 3 is a view on a flat ground. FIG. 2 is a side view of an aerial work vehicle equipped with outriggers. 2a, 2b, 2c, 2d...Outrigger, 7
a, 7b...detector (limit switch), 15,
16... Regulatory device (electromagnetic shut-off valve), 17
...Restriction release switch.

Claims (1)

[Scope of utility model registration request] The jacking stroke of the pair of outriggers provided on the front side of the car body is made longer than the jacking stroke of the pair of outriggers provided on the rear side of the car body, and the jacking length of the pair of outriggers on the front side of the car body is set to the rear side. A detector for detecting when the length has become the same as the jacking stroke of the pair of outriggers, a regulating device for regulating the jacking operation of the front pair of outriggers based on a signal from the detector, and an operation of the regulating device. An outrigger control device comprising: a regulation release switch for releasing the regulation.