永煤集团公司炮采工作面均采用单体液压支柱,配合1.2 m铰接梁支护顶板.铰接梁老化主要是指铰接梁上梁牙受到损伤,造成单体柱与铰接梁咬合效果差,它是炮采工作面安全管理中的潜在隐患之一。1 存在问题在对车集矿2412工作面升井的老化铰接梁进行统计时发现,有80%的老化铰接梁是在铰接梁上悬挂水平楔孔处被损坏。表1所列是一组关于水平楔孔距铰接 The coal mining face of Yongmei Group Company adopts single hydraulic prop with 1.2 m hinged beam supporting roof. Aging of hinged beam mainly refers to the damage of the beam teeth on the hinged beam, resulting in the poor effect of the single column and hinged beam engaging It is one of the hidden dangers in the safety management of blast mining face. 1 Problems In the collection of the 2412 working face lift in the Juji Mine, it is found that 80% of the aged hinged beams are damaged when the horizontal wedge holes are hung on the articulated beams. Listed in Table 1 is a set of horizontal wedge pitch hinges