Crane and hydraulic system thereof for controlling composite motion

Abstract

The invention discloses a hydraulic system for controlling composite motion of a crane. The hydraulic system comprises a first pressure sensor for sensing hydraulic pressure of a load oil-way, a second pressure sensor for sensing hydraulic pressure of a main oil-way, an operation control module in communication-capable connection with the first pressure sensor and the second pressure sensor, a main rising control valve for controlling aperture of a main rising multi-way valve, an auxiliary rising control valve for controlling aperture of an auxiliary multi-way valve and a luffing control valve for controlling aperture of a luffing multi-way valve. The operation control module is respectively in communication-capable connection with the main rising control valve, the auxiliary rising control valve and the luffing control valve. According to the arrangement, execution speed of the execution mechanism in the hydraulic system for controlling composite motion of the crane provided by the invention can be adjusted properly according to changes of load pressure. The invention also discloses a crane comprising the above hydraulic system for controlling composite motion of the crane.

Description

technical field [0001] The invention relates to the technical field of construction machinery, and more specifically relates to a crane and a hydraulic system for controlling composite actions thereof. Background technique [0002] With the continuous development of my country's economic construction, the field of construction machinery has made continuous innovation and progress. In the development process of construction machinery, high efficiency and energy saving has become its development trend. The following content will introduce a kind of crane in the prior art in detail. [0003] At present, in order to meet the needs of large-scale engineering construction, cranes usually need to perform various compound actions, such as performing main lifting, auxiliary lifting and luffing actions at the same time. During the action, each action does not interfere with each other, and the three actions have multiple speed changes at the same time. [0004] However, when the cr...

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Problems solved by technology

[0004] However, when the crane in the prior art is performing compound actions, if an actuator generates a large load pressure in an instant, the hydraulic pressure in the load oil circuit will be greater than the hydraulic pressure in the main oil circuit connected to the hydraulic pump. Pressure, if the hydraulic oil flow of the actuator remains unchanged at this time, that is, the movement speed of the actuator remains unchanged

When the load pressure changes instantaneously, if the movement speed of the actuator is not changed, it will have an adverse effect on the actuator

[0005] Therefore, how to overcome the problem that the execution speed of the actuator in the prior art cannot be properly adjusted according to the change of the load pressure has become an important technical problem to be solved by those skilled in the art

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