根据GB5144《塔式起重机安全规程》的规定,塔机均应设置有起升载荷限制器、起重力矩限制器、行程限位装置及相应的信号输出和指示仪表。过去国内厂家生产的塔机虽然一般都配备有这些安全装置,但就其动作精度和使用可靠性方面均不尽人意。 According to GB5144 “Safety regulations for tower cranes”, tower cranes should be equipped with a lifting load limiter, lifting torque limiter, travel limit device and the corresponding signal output and indication instruments. In the past, tower cranes manufactured by domestic manufacturers were equipped with these safety devices, but they were not satisfactory in terms of their accuracy of operation and reliability of use.