在维修冲天炉、造型机、水力清砂等铸造设备时,经常碰到锈死的螺栓或螺钉的拆卸问题。过去,我们碰到这种情况时大都采用点煤油的办法,若还卸不下时便动用气割切。这样毁坏一些螺栓、螺钉是很可惜的。后来我们采用滴盐酸的办法很是见效。操作简便:用玻璃滴管吸一点稀盐酸,滴数滴在锈螺栓、螺钉的螺纹部位,过4～5分钟后重滴一次,过几分钟后再用棉 In the maintenance of cupola, molding machines, sand and other foundry equipment, often encountered rusty bolts or screws disassembly. In the past, when we encountered such a situation, we mostly used kerosene instead. This is a shame to destroy some bolts and screws. Later, we use drops of hydrochloric acid approach is effective. Easy to operate: Use a glass pipette to absorb a little diluted hydrochloric acid, drops the number of drops in the rust bolt, the screw thread parts, after 4 to 5 minutes heavy drop again, after a few minutes and then with cotton