The invention discloses a hoisting safety protection device, a crane and a hoisting safety control method.The hoisting safety protection device comprises a variable-amplitude oil cylinder, a telescopic oil cylinder, a control valve set and an operating valve, and the operating valve is used for introducing pressure oil into the variable-amplitude oil cylinder and the telescopic oil cylinder and introducing oil in the variable-amplitude oil cylinder and the telescopic oil cylinder into an oil return tank to achieve oil return; and the control valve group is used for communicating or disconnecting the rodless cavity of the telescopic oil cylinder and the oil tank so as to release pressure when the rodless cavity of the telescopic oil cylinder is communicated with the oil tank. According to the hoisting safety protection device, the crane and the hoisting safety control method, the rodless cavity of the telescopic oil cylinder can be controlled to be decompressed according to the pressure of the rodless cavity of the variable-amplitude oil cylinder, so that the telescopic oil cylinder cannot stretch out, the function of preventing telescopic overload is achieved, electronic components such as a moment limiter are not needed, and the cost is reduced. And the device can adapt to an outdoor severe environment, so that the cost is lower, the service life is longer, and the failure rate is lower.

    一种起重安全保护装置、起重机及起重安全控制方法,该起重安全保护装置包括变幅油缸、伸缩油缸、控制阀组和操纵阀,操纵阀用于将压力油引入变幅油缸、伸缩油缸,并将变幅油缸、伸缩油缸内的油液引入回油箱实现回油,控制阀组用于连通或断开伸缩油缸的无杆腔与油箱,以在伸缩油缸的无杆腔与油箱连通时泄压。本发明实施例的起重安全保护装置、起重机及起重安全控制方法中,可根据变幅油缸的无杆腔的压力控制对伸缩油缸的无杆腔进行泄压,使伸缩油缸无法伸出,从而起到防止伸缩超载的作用,而且无需使用力矩限制器等电子元器件,能够适应户外恶劣的环境,因此成本较低,使用寿命较长,故障率较低。


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    Title :

    Lifting safety protection device, crane and lifting safety control method


    Additional title:

    起重安全保护装置、起重机及起重安全控制方法


    Contributors:
    FENG PEI (author) / LIU XUQING (author) / YANG YINGCHUN (author) / LIU CANLUN (author) / TOTOMO (author)

    Publication date :

    2024-11-12


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B66C Krane , CRANES



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