采煤机由电动机,牵引部、截割部固定减速箱与摇臂和底托架等主要部件组成,各部件之间的联接采用螺栓紧固,一螺栓的紧固状态直接影响采煤机工作的性能和整体使用效果,因而螺栓紧固的可靠与否,对采煤机能否正常工作关系甚大。螺栓紧固失效而造成事故的原因大体可归纳如下情况: 1.电机与牵引部、截割部固定减速箱之间,牵引部与固定减速箱之间采用齿轮联轴器传动。该联轴器的摩损和损坏的主要原因之一是螺栓松动。采煤机检修中90％的联轴器需要更换,其摩损的程度和损坏状况与螺栓松动的程度和维护的效果有关。螺栓松 Shearer by the motor, traction Department, the Ministry of fixed cutting gear box and the rocker arm and the bottom bracket and other major components, the connection between the components using bolt fastening, a bolt fastening the status of a direct impact on Shearer work The overall performance and the use of results, and therefore the reliability of bolt fastening, the shearer can work properly or not. Bolt failure caused by the failure of the general can be summarized as follows: 1 motor and traction Department, the cutting unit fixed between the gearbox, traction and fixed gearbox gear transmission between the gear. One of the main causes of the coupling wear and damage is loose bolts. 90% of coal shearer overhaul need to replace the coupling, the extent of its wear and damage and bolt loosening degree and the effect of maintenance. Bolt loose