The control method comprises the specific steps that S1, a telescopic three-position seven-way reversing valve conducts reversing, and hydraulic oil is output to a telescopic valve set to control a first-stage telescopic oil cylinder and a second-stage telescopic oil cylinder to stretch out; s2, when the first-stage telescopic oil cylinder and the second-stage telescopic oil cylinder stretch out to reach the upper limit, the winch control module controls and limits a first two-position two-way reversing valve to reverse; s3, the end P of the limiting first two-position two-way reversing valve communicates with the end B of the limiting first two-position two-way reversing valve, and an oil way between an oil drainage port of the telescopic three-position seven-way reversing valve and the oil tank communicates; s4, the oil tank continues to supply oil to the first-stage telescopic oil cylinder and the second-stage telescopic oil cylinder through the telescopic three-position seven-way reversing valve; and S5, redundant hydraulic oil flows back to the oil tank through the limiting first two-position two-way reversing valve.
本发明提供一种吊钩限位的液压系统及控制方法,具体步骤包括:S1伸缩三位七通换向阀换向,液压油输出至伸缩阀组控制一级伸缩油缸和二级伸缩油缸伸出;S2当一级伸缩油缸和二级伸缩油缸伸出达到上限位时,绞车控制模块控制限位第一二位二通换向阀换向;S3限位第一二位二通换向阀的P端连通限位第一二位二通换向阀的B端,将伸缩三位七通换向阀的泄油端口与油箱之间的油路连通;S4油箱继续通过伸缩三位七通换向阀向一级伸缩油缸和二级伸缩油缸供油;S5多余的液压油经过限位第一二位二通换向阀流回油箱。
Hydraulic system for lifting hook limiting and control method
一种吊钩限位的液压系统及控制方法
2022-03-22
Patent
Electronic Resource
Chinese
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