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英国杰弗里·戴尔蒙德(简称B·J·D)公司生产的Supermatic—300KW采煤机,在电动机、牵引部与截割部的连接上各采用四条M48螺栓和216型油压预紧螺帽(图1),取代了传统标准六角螺帽。
Supermatic-300KW Shearer manufactured by British Jeffrey Delmond Company Limited (BD) used four M48 bolts and 216 hydraulic pre-tensioner to connect the motor, the traction part and the cutting part Nuts (Figure 1), replacing the traditional standard hex nuts.