颚式破碎机PEJ1200×1500的皮带轮钢套每年需更换2次。过去更换铜套无专用工具，只能用加热的方法，使皮带轮内孔增大后装入铜套。这种方法其加热温度难以掌握，加热不足时，铜套难以装入，加热温度过高时，又会使配合间隙增大，加速铜套的磨损。为了缩短检修时间，保证修配质 Jaw crusher PEJ1200 × 1500 pulley steel sleeve to be replaced 2 times a year. In the past to replace the copper sleeve without special tools, can only use heating method, so that after the pulley hole increases into the copper sleeve. This method is difficult to grasp the heating temperature, heating is insufficient, the copper sleeve is difficult to load, the heating temperature is too high, it will increase with the gap, speeding up the wear of copper sleeve. In order to shorten the maintenance time, to ensure repair quality