Crank-arm-type overhead working truck connector levelling hydraulic system

Abstract

The invention discloses a crank-arm-type overhead working truck connector levelling hydraulic system which comprises a traveling oil pump, a hydraulic oil tank, a pressure oil pump, an electromagneticreversing valve, a connector levelling oil cylinder and a folding-arm amplitude-change oil cylinder. An oil inlet P, a working port A, a working port B and a return port T are formed in the electromagnetic reversing valve. The oil inlet P and the pressure oil pump communicate, and the return port T and the hydraulic oil tank communicate. A rod cavity of the folding-arm amplitude-change oil cylinder communicates with a rodless cavity of the connector levelling oil cylinder through a first connecting pipeline, and the working port A communicates with a rodless cavity of the folding-arm amplitude-change oil cylinder through a second connecting pipeline. A rod cavity of the connector levelling oil cylinder communicates with the working port B through a third connecting pipeline. An oil compensating loop is arranged on the first connecting pipeline, one end of the oil compensating loop communicates with the first connecting pipeline, and the other end of the oil compensating loop communicates with the traveling oil pump. Synchronous movement of the folding-arm amplitude-change oil cylinder and the connector levelling oil cylinder is effectively kept, and the crank-arm-type overhead working truck connector levelling hydraulic system is applied to the field of hydraulic control.

Description

technical field [0001] The invention relates to the field of hydraulic control, in particular to a connecting body leveling hydraulic system of an articulating arm type aerial work vehicle. Background technique [0002] like figure 1 When the crank arm type aerial work vehicle shown is moving the folding arm 12 up and down, the airtight cavity formed by the connection between the rod chamber of the folding arm luffing cylinder 6 and the rodless chamber of the connecting body leveling cylinder 7 realizes The synchronous linkage of the two oil cylinders ensures that the working platform 13 and the connecting body 15 between the folding arm 12 and the main arm 14 are always in a translational state. The temperature of the oil in the airtight cavity of the connecting body leveling cylinder 7 drops, and the volume of the oil shrinks to a certain extent, forming a partial vacuum, which directly causes the folding arm luffing cylinder 6 to be pulled out suddenly when the working p...

AI Technical Summary

Problems solved by technology

[0002] like figure 1 When the crank arm type aerial work vehicle shown is moving the folding arm 12 up and down, the airtight cavity formed by the connection between the rod chamber of the folding arm luffing cylinder 6 and the rodless chamber of the connecting body leveling cylinder 7 realizes The synchronous linkage of the two oil cylinders ensures that the working platform 13 and the connecting body 15 between the folding arm 12 and the main arm 14 are always in a translational state. The temperature of the oil in the airtight cavity of the connecting body leveling cylinder 7 drops, and the volume of the oil shrinks to a certain extent, forming a partial vacuum, which directly causes the folding arm luffing cylinder 6 to be pulled out suddenly when the working platform is loaded in the shutdown state. It will cause great damage to the operator and equipment, or when the machine is started again and the arm is folded and the amplitude is changed, the expansion and contraction of the connecting body leveling cylinder 7 lags behind, causing the working platform 13 to tilt, which has certain potential safety hazards

Images