Automatic synchronous bottom oil cylinder jacking and lowering device of crawling crane

Abstract

The invention provides an automatic synchronous bottom oil cylinder jacking and lowering device of a crawling crane. The device comprises a control box in which a manual operating module and an automatic operating module are arranged; a solenoid directional valve is mounted on an oil line of an oil cylinder of the bottom of the crawling crane; a vehicle body horizontal sensor is mounted at the telescopic end of the bottom oil cylinder; the manual operating module is directly connected with the solenoid directional valve to control the bottom oil cylinder to be raised and lowered; the automatic operating module is synchronously connected with the solenoid directional valve and the vehicle body horizontal sensor and is automatically controlled by receiving a signal from the vehicle body horizontal sensor. The automatic synchronous bottom oil cylinder jacking and lowering device of the crawling crane is simple in structure; the degree of manual intervention from an operator can be reduced, so that the degree of fatigue of the operator in operation can be decreased, the automation degree of the operation can be increased, and the safety of the bottom of the crawling crane in raising and lowering can be improved.

Description

technical field [0001] The invention relates to the technical field of hydraulic cranes, in particular to an automatic synchronous jacking and lowering device for a bottom oil cylinder of a crawler crane. Background technique [0002] When the bottom of the existing crane is disassembled and installed, the traditional method is to use four hydraulic cylinders to lift and lower, some of which are controlled by electromagnetic reversing valves, and some are controlled by manual reversing valves. There are four cylinders with jacking and lowering functions, and there is also the action function of a single cylinder. [0003] The existing problem is: Generally, one hydraulic pump supplies oil and operates together. In parallel, there is a phenomenon that the load pressure of each branch is inconsistent. If the oil circuits of each cylinder are connected in series, there will be a problem of pressure superposition, and the system pressure will be relatively high, which requires ...

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Problems solved by technology

[0003] The existing problem is: Generally, one hydraulic pump supplies oil and operates together. In parallel, there is a phenomenon that the load pressure of each branch is inconsistent. If the oil circuits of each cylinder are connected in series, there will be a problem of pressure superposition, and the system pressure will be relatively high, which requires the pressure resistance value of each hydraulic component to be increased

[0004] In the process of jacking up and down, it is now relying on the driver to manually adjust and level the bottom. The driver has a large degree of manual intervention and is prone to fatigue. Operation errors may also easily cause the host to overturn.

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