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本文就目前塔式起重机普遍采用的电子式力矩限制器和弓型（机械式）力矩限制器的使用性能、工作机理和理论推导上存在的问题，提出了较为灵敏、准确、工作性能可靠的挺杠式力矩限制器。通过对其结构设计、工作原理的论述，建立受载变形公式，分析其参数间的关系。它的应用是提高力矩限制器技术性能的又一种途径。
In this paper, the commonly used electronic torque limiter and bow type (mechanical) torque limiter currently used in tower cranes have some problems in their using performance, working mechanism and theoretical derivation. They are quite sensitive, accurate and reliable in working performance Bar torque limiter. Through the structural design and working principle of the discussion, the establishment of load deformation formula, analysis of the relationship between the parameters. Its application is yet another way to improve the performance of torque limiters.