在我厂设计的轻便龙门刨床上所采用的电磁抬刀电磁铁的结构如图1所示。实践证明,这种抬刀系统的工作是不太理想的。经现场测试与分析,引起抬刀不灵的原因是电磁线圈过热。线圈发热后将引起刀架变形并使抬刀降低。据对我厂BQ208型样机左侧刀架的实测,刀架侧面向外扩张0.020mm,底 The structure of the electromagnetic lift knife electromagnet used in the light gantry planer designed by our factory is shown in Fig.1. Practice has proved that the work of carrying the knife system is not ideal. After the field test and analysis, the cause of lifting the knife is not working because the solenoid coil overheating. When the coil is heated, the tool post will deform and the lift will be reduced. According to my factory BQ208 prototype left side of the knife measured, outward expansion of the knife frame 0.020mm, at the end