目前，塔式起重机普遍使用电子式载荷力矩限制器，由于塔机施工环境差，电子元器件受冷、热、潮、湿后不稳定，寿命短，返修率高，降低了载荷力矩限制器的可靠性。本文提出压杆式动臂起重机的机械型偏心式载荷力矩限制器的基本原理和设计计算，目的是为施工现场塔机提供价廉质 At present, the tower crane commonly used electronic load torque limiter, due to poor construction environment of tower crane, electronic components by the cold, heat, tidal, unstable instability, short life, high repair rate, reducing the load torque limiter reliability. This paper presents the basic principle and design calculation of the mechanical eccentric load moment limiter of the bar type boom crane with the purpose of providing inexpensive and low cost