成都金具厂马铁机械化铸造车间成功地用可控硅代替Z—28.5型直流电机,向S925型电磁皮带轮供电。改进前,由于车间粉尘影响电机整流子绝缘,造成炭刷起弧冒火,烧坏整流子及炭刷,引起不发电等故障,致使电磁皮带轮经常不励磁,造成电磁铁失灵,铁磁物质不能吸出,影响型砂质量和生产安全。针对这个生产关键问题,组成三结合小组,提出了用220/110伏、10～15/20～30安可控硅整流装置代替Z—28.5型直流电机向砂处理系统供电 Chengdu Iron & Steel Works Iron & Steel Mechanized Foundry Successfully used SCR instead of Z-28.5 DC motor to supply S925 electromagnetic pulley. Before the improvement, due to workshop dust affect the motor commutator insulation, resulting in carbon brush ignition sparks, burning commutator and carbon brush, causing no power generation and other failures, resulting in the electromagnetic pulley is often not excitation, resulting in electromagnet failure, ferromagnetic material can not be sucked out , Affecting sand quality and production safety. In response to this key issue of production, a combination of three groups was proposed to provide power to the sand treatment system by using 220/110 V, 10-15 / 20-30 AAC silicon rectifier instead of Z-28.5 type DC motor