Sleeve special for electrified fastening of double-cap bolt of grading ring of insulator of direct-current transmission line

The invention relates to a sleeve special for electrified fastening of a double-cap bolt of a grading ring of an insulator of a direct-current transmission line. The sleeve comprises a matching pipe and a fixing pipe, one end of the fixing pipe is connected with one end of the matching pipe, and a two-stage switching and dismounting device is installed in the matching pipe. According to the sleeve, the position switching of a first hexagonal prism and a second hexagonal prism in a hexagonal hole can be utilized, two nuts can be screwed at the same time, only the inner side nut is screwed without disassembling the outer side nut, and only the outer side nut is screwed without affecting the inner side nut. 直流输电线路绝缘子均压环带电紧固双帽螺栓专用套筒，包括配合管与固定管,固定管的一端与配合管的一端连接，配合管的内部安装二级切换拆卸装置，本发明可以利用第一六棱柱与第二六棱柱在六棱形孔内部的位置切换，实现同时拧动两个螺母、只拧动内侧螺母而不需要将外侧螺母拆下，只拧动外侧螺母而不影响内侧螺母。