JB 1375-74对工程起重机基本参数规定如下(表1): 从表中可看出,JB1375-74所规定的基本参数,如起重力矩、有效幅度、总重量等都高于国外同类产品的参数。这种规定已经给起重机设计、制造、使用以及其经济性等方面带来了不利的影响。因此,调整和修改其基本参数已是十分必要了。下面对起重力矩、有效幅度、总重等参数 JB 1375-74 provides the following basic parameters of the crane (Table 1): As can be seen from the table, JB1375-74 basic parameters such as lifting torque, effective amplitude, total weight are higher than similar foreign products parameter. Such provisions have adversely affected crane design, manufacture, use and economy. Therefore, it is very necessary to adjust and modify its basic parameters. Following the lifting torque, the effective range, total weight and other parameters