The invention provides an upper and lower limit detection device and an upper and lower limit detection method for a cargo lifting appliance of an electric chain block, which can easily and quickly detect that the cargo lifting appliance (lifting hook) of the electric chain block reaches the lower limit under the condition that a limit switch for detecting the lower limit is not arranged. In the electric chain block (1) provided with an electric motor (10), a friction clutch (11), an electromagnetic brake (12), a reduction gear mechanism (13), a lifting pulley (2), a lifting chain (3), a cargo lifting tool (6) and the like, a limit switch (18) for upper limit reaching detection is used for detecting that the cargo lifting tool (6) reaches the upper limit. An electric OLL (overload limiter) determines that a stopper (8) comes into contact with a chain guide (4A) and a friction clutch (11) is dragged by the rotational force of an electric motor (10), and the power consumption of the electric motor (10) becomes equal to or greater than a predetermined value, thereby detecting that the friction clutch (11) reaches a lower limit.

    提供一种电动链滑车的货物吊具的上限下限检测装置及上限下限检测方法,可在不设置到达下限检测用限位开关的情况下容易且迅速地检测出电动链滑车的货物吊具(吊钩)到达下限。在具备电动机(10)、摩擦离合器(11)、电磁制动器(12)、减速齿轮机构(13)、起重滑轮(2)、起重链(3)、货物吊具(6)等的电动链滑车(1)中,利用到达上限检测用限位开关(18)进行货物吊具(6)到达上限的检测,由电力式OLL(过载限制器)判定止挡件(8)抵接于链引导件(4A)而使摩擦离合器(11)被电动机(10)的旋转力拖拽,电动机(10)的消耗电力变成了规定值以上这一情况,由此进行到达下限的检测。


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    Title :

    Upper limit and lower limit detection device and upper limit and lower limit detection method for electric chain pulley


    Additional title:

    电动链滑车的上限下限检测装置及上限下限检测方法


    Contributors:
    IDO YUSAKU (author) / ISSHIKI TAKUMA (author)

    Publication date :

    2023-08-04


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B66D Haspeln , CAPSTANS




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