为了保证起重机安全可靠地运行，必须安装力矩限制器或超载限制器。
In order to ensure safe and reliable operation of a crane, it is necessary to install a torque limiter or overload protector.
平衡重块安装位置不准确，会造成起重臂与平衡臂平衡力矩偏差过大，轻易造成塔吊失稳。
Balance weight block installation position is not accurate, will cause the boom and the balance arm balance torque deviation is too large, easily lead to instability of the tower crane.
结果表明：螺栓断裂是由于其制造时产生了严重的带状组织，降低了螺栓的许可扭转力矩，导致螺栓在安装过程中发生扭转断裂。
The results show that the fracture was caused by the banded structure which decreased the permitted rotational moment and resulted in the torsional fracture of the bolts during installation process.
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