The invention discloses an overspeed protective device for a stair lift. The overspeed protective device comprises a cam, a ratchet wheel, a rocker arm component rotatably arranged on the cam, a spring and a limiting switch; a protruding part on the cam and a pawl on the ratchet wheel are arranged in a staggered manner; an idler wheel in contact with the periphery of the cam is arranged at one endof the rocker arm component; a rocker arm hook opposite to the periphery of the ratchet wheel is arranged at the other end of the rocker arm component; the spring is connected with the rocker arm hook and is used for enabling the rotary speed of the rocker arm hook to be matched with the preset rotary speed of the output shaft when the rotary speed of the output shaft is within a preset rotary speed range so as to enable the rocker arm hook and the pawl to be staggered; the limiting switch is opposite to the idler wheel and is used for controlling the output shaft; and the rocker arm hook isbuckled with the pawl when the output shaft exceeds the preset rotary speed, so that the rocker arm component enables the output shaft to stop rotating through the limiting switch. The overspeed protective device is arranged on the output shaft to control the output shaft to stop rotating when the output shaft is overspeed, so that the life safety of a user is guaranteed.

    本发明公开了一种用于座椅电梯的超速保护装置,包括:凸轮、棘轮,凸轮上的凸起部与棘轮上的棘爪相错设置;能转动地设置在凸轮上的摇臂组件,摇臂组件的一端设有与凸轮的外周相接触的滚轮,摇臂组件的另一端设有与棘轮的外周相对的摇臂钩;弹簧,弹簧与摇臂钩相连,弹簧用于在输出轴的转速处于预设转速范围时使摇臂钩的转动速度与输出轴的预设转速相配合,从而使摇臂钩与棘爪相错开;限位开关,限位开关与滚轮相对设置,限位开关用于控制输出轴,摇臂钩在输出轴超出预设转速时与棘爪相扣,从而使摇臂组件通过限位开关使输出轴停止旋转。通过在输出轴上设置该超速保护装置,控制输出轴超速时停止旋转,从而保障用户生命安全。


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    Title :

    Overspeed protective device for stair lift


    Additional title:

    一种用于座椅电梯的超速保护装置


    Contributors:
    CHEN YUNRU (author)

    Publication date :

    2020-10-30


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B66B Aufzüge , ELEVATORS



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