Hydraulic control circuit and method for preventing pressure loss

Abstract

The invention provides a decompression-preventing hydraulic control loop and a method thereof. The hydraulic control loop comprises, at least, an integrated hydraulic cylinder and an oil-way cutting-off hydraulic loop, wherein the integrated hydraulic cylinder comprises a hydraulic cylinder body and a hydraulic cylinder integrated valve block, the hydraulic cylinder integrated valve block is installed on the hydraulic cylinder and used for controlling start and stop of the hydraulic cylinder and locking of the hydraulic cylinder during system decompression, and the hydraulic cylinder integrated valve block is connected with the oil-way cutting-off hydraulic loop and used for controlling actions of the hydraulic cylinder and cutting off of an oil way of the hydraulic cylinder during system decompression. The invention further provides the method for achieving the decompression-preventing hydraulic control loop. The decompression-preventing hydraulic control loop has the advantages of being simple in structure, safe, reliable and quick in accident response, being unlimited in hydraulic cylinder installation direction and being of a load type and can be combined with external pressure monitoring to achieve predictive control of system accidents. In addition, when a control system is accidentally powered off, the hydraulic cylinder is in a safe locked state. The decompression-preventing hydraulic control loop is suitable for the occasion having the higher requirements for a hydraulic cylinder stop position state during system decompression.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering, and in particular relates to a hydraulic control circuit and a method thereof for preventing hydraulic cylinders from losing pressure during the lifting process of metallurgical equipment, engineering machinery and heavy vehicles. Background technique [0002] The hydraulic control circuit is composed of several hydraulic components (hydraulic pump station or hydraulic power source, hydraulic pipeline, control valve table and hydraulic cylinder), which are used to control the oil circuit structure to complete specific functions, and are widely used in metallurgical equipment, engineering machinery , heavy vehicles and other mechanical engineering technology fields. There are a large number of hydraulic cylinder lifting control circuits in the hydraulic control circuits of these devices, which are characterized by heavy loads and harsh working environments, which cause hydraulic con...

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Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a hydraulic control circuit and method for preventing pressure loss, which can not only include the scope of the existing explosion-proof valve pressure loss control circuit, but also be used to solve the problems of the prior art. In the hydraulic control circuit, when the horizontal load or the hydraulic cylinder without external load loses pressure, the position of the hydraulic cylinder cannot be effectively locked; in addition, when the control system unexpectedly loses power, the hydraulic cylinder will be in a safe locked state and can be connected with the external pressure Combined Monitoring and Control to Realize Predictive Control of System Accidents

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