JPH08301578A - Automatic overhanging device for outrigger - Google Patents

Abstract

PURPOSE: To make an outrigger overhang by the desired quantity rapidly and easily. CONSTITUTION: An automatic overhanging device 10 is composed of an input setting means 11 for inputting and setting the target overhang quantity of an outrigger. A driving means 12 for operating the outrigger to overhang, a detecting means 13 for detecting the actual overhang quantity of the outrigger, a comparing means for comparing the target overhang quantity, inputted and set by the input setting means 11, with the actual overhang quantity detected by the detecting means 13, and a stop means 16 for stopping the overhang operation performed by the driving means 12 when the target overhang quantity and the actual overhang quantity coincide with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outrigger automatic extension device for an aerial work vehicle or a crane vehicle.

[0002]

2. Description of the Related Art The body of an aerial work vehicle or a crane vehicle is provided with two or four outriggers that project laterally from the body and ground the lower end to support the body. By supporting the vehicle body with this outrigger, the stability of the vehicle body is increased, and the boom can be safely operated to perform work in high places or lifting work of heavy objects. By the way, it is desirable that the overrigger amount of the outriggers be as large as possible. However, an obstacle such as a wall may exist on the side of the vehicle body depending on the stop location of the vehicle body, and it is also necessary to prevent interference between the outrigger and these obstacles. Therefore, conventionally, when the outriggers are extended, the outriggers are visually checked one by one so that the outriggers have the maximum amount that does not interfere with the obstacle.

[0003]

However, if the outrigger is extended while visually checking the overhanging condition one by one, there is a possibility that the operation at hand may be mistaken.
Also, if four outriggers are overhanged one by one, many operations are required, which is troublesome.
There is a problem that it takes a long time after the work vehicle arrives at the site before the work is started, resulting in deterioration of work efficiency.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an automatic outrigger overhang device capable of rapidly overhanging the outrigger without erroneous operation.

[0005]

In order to achieve the above object, in the present invention, an input setting means for input-setting a target overhang amount of an outrigger, a drive means for extending the outrigger, and an outrigger actual operation. Detection means for detecting the amount of overhang,
The comparing means compares the target overhang amount input and set in the input setting means with the actual overhang amount detected by the detecting means, and judges whether or not these overhang amounts match, and this comparing means The automatic overhang device is configured by a stop unit that stops the overhang operation by the drive unit when it is determined that the target overhang amount and the actual overhang amount match. When there are a plurality of outriggers, the target setting amount for each outrigger is input and set by the input setting means, each outrigger is operated to be extended by the driving means, and the actual overhanging amount for each outrigger is detected by the detecting means. The comparison means compares the target overhang amount and the actual overhang amount for each outrigger to determine whether or not they match, and the outrigger is determined to match between the target overhang amount and the actual overhang amount. It is desirable that the overhanging operation be stopped by the stopping means every time.

[0006]

In such an automatic bulging device, the operator sets in advance the maximum bulging amount of the outrigger as the target bulging amount through the input setting means. After the outriggers of the respective outriggers are started to be extended by the driving means, the overhanging operation is automatically stopped by the stopping means when the target overhang amount and the actual overhang amount compared by the comparing means match. In this way, the outrigger can be overhanged by a desired overhang amount without visually checking the overhang condition. When overhanging multiple outriggers, set the target overhang amount for each outrigger in advance, start the overhang operation of all outriggers simultaneously, and select each outrigger for which the target overhang amount and the actual overhang amount match. If the overhanging operation is stopped, all outriggers can be overhanged in a short time.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. First, FIG. 4 shows an aerial work vehicle equipped with the outrigger automatic extension device according to the present invention. The aerial work vehicle 40 is configured by using a truck as a base vehicle body, and a swivel base 42 that can freely swivel horizontally with respect to the vehicle body 41 is attached to a rear portion of the vehicle body 41. A boom 43, which is configured to be telescopically expandable and contractible, is attached to an upper portion of the swivel base 42 so as to be capable of undulating. Further, a work table 44 is attached to the tip of the boom 43. The workbench 44 is held horizontally by a leveling device (not shown) regardless of the up and down state of the boom 43.

According to the aerial work vehicle 40 constructed as described above, an operator (not shown) on the workbench 44 can work together with the workbench 44 through an operation of the swivel base 42 and the boom 43. You can move to another place. Then, it is possible to perform electric work on the upper part of the electric pole or to construct a building.

By the way, by the operation of the swivel base 42 and the boom 43, a moment acts on the vehicle body 41 in the direction of overturning the vehicle body 41. In order to stabilize the vehicle body 41 against such a falling moment, the outriggers 20 are attached to the front, rear, left and right of the vehicle body 41 at four locations. The outrigger 20 includes an outrigger beam 22 that extends (extends) and contracts (retracts) toward the side of the vehicle body 41 when the hydraulic extension cylinder 21 mounted between the outrigger 20 and the vehicle body 41 expands and contracts. The outer post 23 is attached to the tip of the beam 22 so as to extend vertically, the inner post 24 is inserted into the outer post 23 so as to be extendable downward, and the outer post 23 and the inner post 24 are attached. It is composed of a hydraulic jack cylinder 25 that extends and retracts 24 with respect to the outer post 23, and a ground plate 26 attached to the lower end of the inner post 24.

The outrigger 20 thus constructed is
The vehicle body 41 can be supported on the ground by appropriately extending the outrigger beam 22 and then extending (lowering) the inner post 24 to ground the ground plate 26 to the ground. Then, in order to collectively control the overhanging operation of the outrigger beams 22 in each outrigger 20, the automatic overhanging device according to the present invention is attached to the aerial work vehicle 40. Hereinafter, this automatic extension device will be described with reference to FIG.

The automatic extension device 10 includes an input board (input setting means) 11 and an extension controller (driving means) 12.
And an overhang amount detector 13, a comparator 15, and a stop signal generator (stop means) 16. Input board 1
On the upper surface of 1, a simplified picture of the plan view of the vehicle body 41 is drawn, and at the positions corresponding to the respective outriggers 20,
A target overhang amount setting button 11a having numbers “1” to “5” is provided. The numbers "1" to "5" correspond to the amount of overhang, and the larger the number, the greater the overhang. When the target overhang amount setting button 11a is selected one by one for each outrigger 20,
The input board 11 has buttons 11a that have been selected and operated.
The signal corresponding to the number is sent to the comparator 15. Also,
A start button 11b is arranged at the center of the input board 11 (the center of the above picture). This start button 1
When 1b is operated, the input board 11 sends a start signal to the extension controller 12 and the comparator 15.

Upon receiving the start signal, the overhang controller 12 outputs an excitation signal to the hydraulic valve (solenoid valve) 17 that controls the operation of the hydraulic overhang cylinder 21 described above. When the hydraulic valve 17 receives the excitation signal, the hydraulic valve 17 extends the extension cylinder 21 (that is, the outrigger beam 22 is extended).
To supply hydraulic pressure.

The overhang detector 13 is attached to each of the outriggers 20, and is vertically aligned at a position where the cam 13a attached to the side surface of the outrigger beam 22 and the side surface of the outrigger beam 22 in the vehicle body 41 are opposed to each other. It is composed of five limit switches 13b arranged. The end surface of the cam 13a on the front end side of the outrigger beam 22 (hereinafter referred to as the front end surface) is formed in a stepped shape that protrudes toward the front end side toward the lower stage. Each limit switch 13b is arranged so as to correspond to the height of the tip surface of each step of the cam 13a. Each limit switch 13b is turned on when a switch lever (not shown) is pushed by the cam 13a, and outputs a detection signal.

In such an overhang amount detector 13,
When the outrigger beam 22 starts the extension operation from the retracted retracted state (actual extension amount “0”), first, the lowermost tip surface of the cam 13a pushes the switch lever of the limit switch 13b arranged at the bottom. Then, turn it on (actual overhang "1"). When the outrigger beam 22 is further extended, the tip end surface of the second lowermost step of the cam 13a pushes the switch lever of the second lowermost limit switch 13b while the lowermost limit switch 13b is kept on, Is turned on (actual overhang amount “2”). In this way, as the extension of the outrigger beam 22 progresses, the lower limit switch 13b is turned on, and when the uppermost limit switch 13b is turned on by the uppermost tip surface of the cam 13a, the actual overhang amount is Maximum (“5”). The detection signal output from each limit switch 13b is sent to the comparator 15.

The comparator 15 receives the start signal from the input board 11 and performs arithmetic processing according to the flowchart shown in FIG. The flowchart is provided for each outrigger 20. In step S1, the target overhang amount Wo (= “1” -input from the input board 11 by the selection operation of the target overhang amount setting switch 11a).
“5”) and the actual overhang amount Wa (= “0” to “5”) detected by the overhang amount detector 13 are read. Step S
In 2, the target overhang amount Wo and the actual overhang amount Wa are compared,
When Wo> Wa, the process proceeds to step S3, and when Wo ≦ Wa, the process proceeds to step S4. In step S3, the extension controller 12 is caused to continue the extension operation of the outrigger beam 22 (specifically, no signal is output). On the other hand, in step S4, an instruction signal is output to the stop signal generator 16.

When the stop signal generator 16 receives the instruction signal, it outputs a stop signal to the overhang controller 12.
As a result, the overhang controller 12 switches the hydraulic valve 17 to stop the hydraulic pressure supply to the outrigger 20.

Next, the operation of the automatic extension device 10 thus configured will be described with reference to FIG. As shown in the figure, when the aerial work vehicle 40 is to be supported on the road where the wall surface W of the building is approaching on the left side and the guardrail G is installed on the right side, and the electric work is to be performed on the upper part of the electric pole D, First, the operator determines the maximum overhang amount at which each outrigger 20 does not interfere with the obstacles (the wall surface W and the guardrail G) existing in the overhang direction (sideward), and the number corresponding to the maximum overhang amount. The target overhang amount setting button 11b marked with is operated. In this example, for the right front outrigger 20 where the guardrail G exists in the overhanging direction, the target overhang amount setting button 11b of “4” is operated, and for the left and right outriggers 20 where the wall surface W exists in the overhanging direction, respectively. 3 ”,“ 1 ”
The target overhang amount setting button 11b is operated. Further, for the right rear outrigger 20 having no obstacle in the projecting direction, the target projecting amount setting button 11b of "5" is operated.

After the setting of the target overhang amount for each outrigger 20 is completed in this way, the worker presses the start button 1
Operate 1b. The extension controller 12 starts the extension operation of all the outriggers 20 (outrigger beams 22). At the same time, the operation of the comparator 15 is started. When the actual overhang amount Wa of the outrigger 20 detected by the overhang amount detector 13 attached to the left rear outrigger 20 matches the target overhang amount Wo (= “1”), the stop signal is output. Only the projecting operation of the outrigger 20 is stopped by the stop signal output from the generator 16. Furthermore, when the actual overhang amount Wa of the left front outrigger 20 matches the target overhang amount Wo (= “3”), the actual overhang amount Wa of the right front outrigger 20 is over the target overhang amount Wo (=
When the actual overhang amount Wa of the right rear outrigger 20 matches the target overhang amount Wo (= “5”), the overhang operation of each outrigger 20 is sequentially stopped. Thus, the extension of all the outriggers 20 is completed within a short time.

In the above-mentioned embodiment, the case where the automatic overhanging device according to the present invention is attached to a work vehicle at high places has been described. Can also be applied.

[0020]

As described above, according to the automatic overhanging device of the present invention, the outrigger is automatically set to the target overhanging amount by inputting and setting the target overhanging amount in advance. Can only overhang. For this reason, it is not necessary to visually check the overhang condition, and it is possible to prevent an erroneous operation. In addition, when projecting multiple outriggers, input and set the target overhang amount for each outrigger in advance.
If all outriggers are extended at the same time and then the extension is stopped for each outrigger whose actual overhang amount matches the target overhang amount, it is possible to overhang one by one compared to the conventional method. Thus, the extension of all outriggers can be completed in a short time. Therefore, it is possible to quickly start the work by the work vehicle to which the plurality of outriggers are attached.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an outrigger automatic extension device according to the present invention.

FIG. 2 is a control flow chart of the automatic extension device.

FIG. 3 is an operation explanatory view of the automatic extension device.

FIG. 4 is a perspective view of an aerial work vehicle equipped with the automatic extension device.

[Explanation of symbols]

 10 Automatic Overhang Device 11 Input Board 13 Overhang Detector 20 Outrigger 40 Aerial Work Vehicle

Claims (2)

[Claims] 1. An automatic outrigger for an outrigger, which extends laterally of a vehicle body and grounds a lower end of the vehicle body to support the vehicle body, the input setting means for inputting and setting a target overhanging amount of the outrigger. A drive unit for activating the outrigger, a detection unit for detecting an actual overhang amount of the outrigger, a target overhang amount input and set by the input setting unit, and an actual overhang amount detected by the detection unit. And a comparing means for judging whether or not these overhang amounts match with each other, and the drive means when the comparing means determines that the target overhang amount and the actual overhang amount match. An outrigger automatic overhanging device, comprising: stop means for stopping the overhanging operation by the means. 2. When a plurality of the outriggers are attached to the vehicle body, the input setting means inputs and sets a target overhang amount for each of the outriggers, and the driving means extends all the outriggers at the same time. The detection means detects the actual overhang amount for each outrigger, and the comparing means detects the actual overhang amount input by the input setting means and the actual overhang amount detected by the detecting means. The amount of each outrigger is compared with each other to determine whether or not the target amount of overhang and the actual amount of overhang are coincident with each other. The automatic outrigger device for an outrigger according to claim 1, wherein the overhanging operation by the drive means is stopped for each of the outriggers determined to have the same amount of outflow.