JPH06179595A - Supporting state controller of wheel type crane - Google Patents

Abstract

PURPOSE:To enable the supporting state of a crane main body by an outrigger to be automatically corrected in the stable direction. CONSTITUTION:When the supporting state of a crane main body is out of the preset supporting state, the extension/contraction amounts of respective supporting legs 5..., for making the crane main body into its set supporting state is computed by the computing unit 10 of a controller 8 on the basis of the detected signals from inclinometers 6, 7, and control signals are output toward flow rate control valves 13 for supporting-leg control from an output unit 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support condition control device for stabilizing a support condition of a crane main body by an outrigger in a wheel type crane such as a truck crane and a rough terrain crane.

[0002]

2. Description of the Related Art Generally, in a wheel-type crane, outriggers that extend and retract on both front and rear sides are provided,
At the time of crane work, the outrigger is extended and the crane main body is lifted and supported by an extendable support leg (hydraulic cylinder) vertically provided at the tip of the outrigger.

However, when the support surface (the ground contact surface of the support leg) is not horizontal, or when an excessive suspension moment acts, the crane main body is in an unstable supporting state in which it is inclined with respect to the horizontal plane, and The hanging capacity was to be significantly reduced.

Conventionally, as a measure against this point, (a) with respect to the above-mentioned problem, an operator adjusts each support leg by looking at the support state when the outrigger is extended.

(B) With respect to the above problems, an overload prevention device is mounted so that an alarm is issued when an overload risk occurs or the operation to the dangerous side is automatically stopped.

[0006]

However, the above (a)
According to this, the outrigger overhanging operation becomes troublesome. Also,
When the ground is soft, the crane body may tilt toward the load side during work, and adjustment when the outrigger is extended may be useless.

On the other hand, according to the above (b), since the inclination itself of the crane main body cannot be detected, the instability of the supporting state cannot be prevented, and the problem that the lifting capacity on the inclination side is lowered cannot be solved.

Therefore, the present invention provides a support condition control device for a wheel type crane that can automatically correct the support condition in a stable direction.

[0009]

According to the present invention, a plurality of outriggers having extendable support legs are provided, and in a wheel type crane for lifting and supporting a crane main body by the outriggers, extension and contraction control of the support legs of each of the above outriggers is performed. Support leg control means, an inclination sensor for detecting the inclination angle of the crane main body with respect to the horizontal plane, and the support leg control means so that the crane main body is in a preset supporting state based on a signal from the inclination sensor. And a controller that outputs a control signal toward the.

[0010]

According to the above structure, when the crane main body comes out of the preset supporting state (for example, horizontal state) during the outrigger extension and during work, the supporting leg control action of the controller based on the detection signal from the tilt sensor. By this, the support state of the main body is automatically corrected toward the set support state.

[0011]

Embodiments of the present invention will be described with reference to the drawings.

In FIG. 2, reference numeral 1 denotes a crane main body which is driven by wheels (not shown). A boom 2 for hoisting a load W is provided on the crane main body 1 so as to be hoisted up and down, and a pair of left and right outriggers 3 are arranged on both front and rear sides.
Is provided.

Each of the outriggers 3 extends horizontally and can be retracted, and an extendable support leg (hydraulic cylinder) vertically provided at the tip of the outrigger body 4.
5, and the crane main body 1 is lifted and supported by the support legs 5 during crane work.

The crane main body 1 is provided with inclinometers 6 and 7 in two horizontal directions (two directions at right angles or two directions at right angles), and the horizontal planes of the crane main body 1 are provided by the inclinometers 6 and 7. The inclination state with respect to is detected, and the detected angle signal is taken in by the controller 8 shown in FIG.

The controller 8 comprises an input section (A / D converter) 9 to which an angle signal is inputted, a calculation section 10 and an output section (D / A converter) 11, and from this output section 11. , A control signal is output via an amplifier 12 to an electromagnetic proportional flow rate control 13 ... Which individually controls expansion and contraction of each support leg 5, ... By this control signal, the opening degree of each control valve 13 ... The amount of oil supplied to 5 ... Is controlled.

The computing unit 10 determines the tilt direction and tilt angle of the crane body 1 at that time on the basis of the fetched detection signal, and the tilt direction and angle thus indexed and the preset body supporting state. The difference is obtained by comparing with the horizontal state, the extension amount or reduction amount of each support leg 5 for calculating this difference is calculated, and the control valve control amount corresponding to this extension amount or reduction amount is obtained. , Signal this.

By the action of the controller 8, when the crane main body 1 is out of horizontal support during outrigger extension and during work, each support leg 5 is controlled to expand and contract (upward side is contraction control or downward side is expansion control). )
Then, the supporting state of the crane body 1 is automatically corrected horizontally.

By the way, in the above embodiment, the crane body 1
The support legs 5 are controlled so that the crane is in a horizontal state. However, depending on the working conditions and the like, the state in which the crane is not horizontal but inclined at a specific angle in a specific direction may be used as the set supporting state of the crane body 1. Good.

[0019]

As described above, according to the present invention, when the support state of the crane body deviates from the set state, this is detected by the tilt sensor, and the support leg control operation of the controller based on the detected value allows Since the supporting state of the main body is automatically corrected, the crane main body 1 can always be supported in a stable manner, and thus the lifting capacity can be improved.

Further, unlike the conventional case, the operator does not have to take the trouble of extending and adjusting each supporting leg while seeing the supporting state when the outrigger is extended.

[0021]

[Brief description of drawings]

FIG. 1 is a block configuration diagram of an apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view of a crane equipped with the same device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crane main body 3 Outrigger 4 Outrigger main body 5 Support legs 6,7 Inclinometer (tilt sensor) 8 Controller 10 Controller calculation unit 13 Flow control valve as expansion / contraction control means of support legs

Claims (1)

[Claims] 1. A wheel-type crane provided with a plurality of outriggers having extendable and retractable support legs, wherein the outriggers lift and support a crane main body, and support leg control means for controlling the extension and contraction of the support legs of each of said outriggers.
An inclination sensor that detects the inclination angle of the crane main body with respect to the horizontal plane, and based on a signal from the inclination sensor,
A support state control device for a wheel type crane, comprising: a controller that outputs a control signal to the support leg control means so that the crane main body is brought into a preset support state.