Anti-shaking balance valve, telescopic control loop of hydraulic cylinder and hydraulic device

Abstract

The invention discloses an anti-shaking balance valve, which comprises a main check valve (2) and a sequence valve group, wherein the sequence valve group comprises a sequence valve (3) and a buffer control valve, a valve core (64) of the buffer control valve can be moved to an opening position from a closing position through drive of hydraulic oil output by the sequence valve (3), and the valve core (64) is at least located on the opening position, so that an output port (10) of the sequence valve (3) is communicated with a first port (7), the buffer control valve is provided with a buffer cavity, and the buffer cavity is communicated with the first port (7) through a buffer throttle hole (15). In addition, the invention further provides a telescopic control loop of a hydraulic cylinder and a hydraulic device. According to the invention, owing to buffer action of the buffer damping hole, the opening time of the valve core of the buffer control valve and the opening time of the main valve core of the sequence valve have a time difference so as to play an action of buffer, thus the flow peak value generated by load change is avoided, the flow change of the balance valve is stable, and the relatively effective vibration damping effect is realized.

Description

Technical field [0001] The invention relates to a balance valve in a hydraulic control valve, in particular to an anti-shake type balance valve. In addition, the present invention also relates to a hydraulic cylinder telescopic control circuit with the anti-shake type balance valve. Background technique [0002] Hydraulic cylinders are used in various fields to drive loads for telescopic motion. Typically, the mechanical parts of the working mechanism of construction machinery are widely driven by hydraulic cylinders. In this case, the mechanical parts of the working mechanism of construction machinery constitute the hydraulic cylinder Loads such as the folding boom of a concrete pump truck, the telescopic boom of a hydraulic crane, the grab bucket of an excavator, etc. The telescopic movement of the hydraulic cylinder is controlled by the hydraulic cylinder telescopic control circuit. The hydraulic cylinder in the construction machinery needs to drive the mechanical parts of th...

AI Technical Summary

Problems solved by technology

However, when the hydraulic cylinder 4 drives the boom to perform the boom retraction action, since there is friction between the booms and the resistance changes constantly, this causes the load pressure of the hydraulic cylinder 4 to change constantly, and the load pressure reacts to the oil pressure and The opening control pressure of the balance valve changes continuously (that is, the hydraulic control oil pressure received by the control port X), so that the opening size of the valve core of the balance valve also changes continuously, and finally causes the rodless chamber of the hydraulic cylinder to return oil The flow is constantly changing, which will cause the boom to move fast and slow when retracting the boom, resulting in severe shaking

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