The invention discloses a tower crane lifting variable magnification structure which comprises a tower crane arm support, an upper pulley block and a lower pulley block, clamping plates are rotationally installed on the two sides of the top of the upper pulley block outwards through first shaft bodies correspondingly, and clamping hooks are formed on the two sides of the top of the lower pulley block in an outwards protruding and extending mode correspondingly. Locking holes for hooking the clamping hooks are formed in the positions, close to the bottoms, of the clamping plates, the tops of the two clamping plates face each other and extend upwards in a protruding mode, the top ends of the clamping plates are higher than the top end of the upper pulley block, and when the upper pulley block ascends to the positions where the tops of the clamping plates abut against the bottom of the tower crane boom, the locking holes are locked. And the clamping plate rotates outwards, and the clamping hook is separated from the lock hole. The device is reliable in structure and easy to operate, and automatic magnification changing can be almost achieved.

    本申请公开了一种塔式起重机起升变倍率结构,包括塔机臂架、上滑轮组以及下滑轮组,所述上滑轮组的顶部两侧分别通过第一轴体向外转动安装有卡板,所述下滑轮组的顶部两侧分别向外凸伸形成有卡勾,所述卡板靠近底部处形成有钩住所述卡勾的锁孔,两所述卡板的顶部相向且向上凸伸,所述卡板的顶端高于所述上滑轮组的顶端,所述上滑轮组上升至所述卡板的顶部抵持于所述塔机臂架的底部时,所述卡板向外转动且所述卡勾与所述锁孔脱离。本发明结构可靠,操作简单,可以几乎实现自动化变倍率。


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    Title :

    Lifting variable magnification structure of tower crane


    Additional title:

    一种塔式起重机起升变倍率结构


    Contributors:
    ZHANG JUN (author)

    Publication date :

    2023-07-25


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B66C Krane , CRANES



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