The invention provides a hook upper limit limiting method. The method comprises the following steps: after a lifting handle is operated, one path of hydraulic oil pumped out by an oil pump flows froma port B to a port E to drive a winch system to work, and the other path of hydraulic oil is controlled to flow from the port B to a port D, flow through a first shuttle valve and a first shuttle valve and enter a control end of a pilot overflow valve, the pilot overflow valve is switched off, an induction block continues to rise, when the induction block enters the induction range of proximity switches, the proximity switches send out signals, a PLC controls a first two-position two-way electromagnetic ball valve to lose power, an oil way of the first two-position two-way electromagnetic ballvalve is connected, the hydraulic oil flowing from the port B to the port D directly returns to an oil tank from the first two-position two-way electromagnetic ball valve, the pilot overflow valve isswitched on, the output end of the oil pump and an oil return pipeline form a passage, and the hydraulic oil pumped out by the oil pump directly returns to the oil tank, so that the winch system doesnot perform lifting action even if a lifting handle is continuously operated, and the purpose of limiting is achieved.

    本发明提供一种吊钩上限位限制方法,操作起升手柄后,油泵泵出的一路液压油从B口流向E口,驱动绞车系统工作,另一路控制液压油从B口流向D口,流经梭阀一、梭阀二,进入先导型溢流阀的控制端,先导型溢流阀关闭,感应块继续上升,当感应块进入接近开关的感应范围时,接近开关发出信号,PLC控制二位二通电磁球阀一失电,使其油路导通,从B口流向D口的液压油直接从二位二通电磁球阀一回油箱,先导型溢流阀打开,油泵的输出端与回油管路形成通路,油泵泵出的液压油直接回油箱,这样即使继续操作起升手柄,绞车系统也不会做起升动作,从而达到限位的目的。


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    Title :

    Hook upper limit limiting method


    Additional title:

    一种吊钩上限位限制方法


    Contributors:
    CHEN YI (author) / MA QIANYUN (author) / DU CHUNJIANG (author) / DENG XUYI (author) / GU WENPING (author) / SONG XINGXIANG (author) / GUO ANLUO (author) / WANG LIANGWEI (author) / ZHOU GUOBAI (author) / CHEN JIAQING (author)

    Publication date :

    2021-02-12


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B66C Krane , CRANES



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