我厂是机械维修、制造单位,使用交流电焊机较多。而电焊机损坏多数是一次线圈烧断。经解体检查发现,BX_3型电焊机一次线圈烧断多数是由二次线圈的紧固螺丝与一次线圈相碰,致使一次线圈绝缘受损,造成短路。紧固螺丝与一次线圈相碰的情况有二:①因振动,紧固螺丝螺帽松动,螺杆掉落在一次线圈上。②调节电流时,当二次线圈下降到最低点时,螺杆与一次线圈相碰。 针对以上情况,我们采取了相应的改进方法:①将每根紧固螺丝钻一小孔,插入开口销,以防螺帽松动;②将原一次线 I plant is machinery maintenance, manufacturing units, the use of AC welding more. The majority of electric welding machine is a coil blown. Disintegration examination found that BX_3-type welding machine is the majority of a coil blown by the secondary coil fastening screws and a coil collide, resulting in a coil insulation damage, resulting in short circuit. Tighten the screws and a coil in two cases: ① due to vibration, tighten the screw nut loose, screw drop in a coil. ② adjust the current, when the secondary coil down to the lowest point, the screw and a coil collide. In view of the above situation, we have taken a corresponding improvement: ① each fastening screw drill a small hole into the cotter pin to prevent the nut loose; ② the original line