Explosion-proof valve, hydraulic control system, hydraulic control method and excavator

Abstract

The invention provides an explosion-proof valve, a hydraulic control system, a hydraulic control method and an excavator. The explosion-proof valve is arranged between an oil supply device and a hydraulic actuating element, and comprises a logic check valve and a hydraulically controlled oil pipeline. An electromagnetic reversing valve and a pressure control valve are arranged in series on the hydraulically controlled oil pipeline. The electromagnetic reversing valve is used for controlling the logic check valve to be opened and closed. The pressure control valve is used for controlling the pressure of hydraulically controlled oil on the hydraulically controlled oil pipeline. By adopting an electronically controlled explosion-proof valve as the explosion-proof valve and arranging the explosion-proof valve in the hydraulic control system, the back pressure value of the explosion-proof valve when the hydraulic actuating element is lowered can be effectively reduced, corresponding pipeline arrangement is reduced, the pipeline connection is simple, the cost is greatly reduced, the oil leakage risk points are reduced, by arranging the explosion-proof valve in the hydraulic control system of a movable arm of the excavator, the movement speed of the movable arm is increased, and the lowering speed of the movable arm and the coordination of composite movement are not affected by mounting the explosion-proof valve additionally.

Description

technical field [0001] The present disclosure relates to the technical field related to excavators, in particular to an explosion-proof valve, a hydraulic control system, a hydraulic control method and an excavator. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Explosion-proof valve is a new type of valve. Because it can play a very good role in preventing explosion and cracking of pipelines, it has been recognized by people and named explosion-proof valve. The main principle of the explosion-proof valve is to complete a series of work through the internal structure of the valve, and finally make the entire pipeline transportation reach a stable state, avoiding the bursting of the pipeline. [0004] In the development process of hydraulic excavators, users have higher and higher requirements for the safety performance of excavators. I...

AI Technical Summary

Problems solved by technology

The explosion-proof valve used by the existing excavator is equipped with a check valve inside, which is used to connect the output of the oil pump outlet to the oil cylinder to realize oil intake, and the oil return is realized by setting a balance valve and connecting the reversing valve to sense the pipeline pressure. , there is an oil return throttling loss of 2 to 5 MPa, and at the same time, the spool of the reversing valve will also generate oil return loss. The superimposition of the oil return loss of the balance valve and the reversing valve will increase the overall oil return loss of the rodless chamber of the boom cylinder. Reduced the recovery speed of the boom cylinder, and at the same time affected the compound action of the boom and other actions

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