The invention provides a hydraulic system for crane overload protection and a control method. The control method comprises the specific steps that S1, an overload three-position seven-way reversing valve is reversed, the P end of the overload three-position seven-way reversing valve is communicated with the B end, and an oil tank conveys hydraulic oil to a winch control module; s2, when the double-telescopic crane reaches the upper lifting limit, the overload second two-position two-way reversing valve is reversed, so that the P end and the B end of the overload second two-position two-way reversing valve are communicated; s3, the winch control module controls the overloaded first two-position two-way reversing valve to reverse, and the P end of the overloaded first two-position two-way reversing valve communicates with the B end of the overloaded first two-position two-way reversing valve; s4, the oil tank continues to supply oil to the winch control module through the overload three-position seven-way reversing valve; and S5, redundant hydraulic oil can flow back to the oil tank from the overloaded first two-position two-way reversing valve.
本发明提供一种吊机超载保护的液压系统及控制方法,具体步骤包括:S1超载三位七通换向阀换向,将超载三位七通换向阀的P端连通B端,油箱向绞车控制模块输送液压油;S2当双伸缩吊机达到起升的上限位时,超载第二二位二通换向阀换向,使得超载第二二位二通换向阀的P端与B端连通;S3绞车控制模块控制超载第一二位二通换向阀换向,将超载第一二位二通换向阀的P端连通B端;S4油箱继续通过超载三位七通换向阀向绞车控制模块供油;S5多余的液压油即可从超载第一二位二通换向阀流回油箱。
Hydraulic system for overload protection of crane and control method
一种吊机超载保护的液压系统及控制方法
2022-03-22
Patent
Electronic Resource
Chinese