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八三年《锻压机械》杂志刊登了天津锻压机床厂所写“液压机卸压过程产生振动的原因及消除方法”,根据类似原理,这种方法已广泛应用较大型的四柱万能液压机(液体压力在200kgf/cm~2以上),使液压机基本消除(换向)卸压过程所产生的振动。但是,采用预卸换向阀系统的液压机用于多粉尘行业的工厂(如粉末冶金、砂轮等),长期工作,将出现粉尘把预卸换向阀堵塞的现象,使液压机不能正常工作。
According to a similar principle, this method has been widely used larger four-cylinder universal hydraulic machine (liquid pressure in the pressure of 200kgf / cm ~ 2 above), so that the basic elimination of the hydraulic press (commutation) pressure relief process generated by the vibration. However, the hydraulic press with the pre-unloader valve system is used in factories with many dust industries (such as powder metallurgy and grinding wheels) for a long period of time to cause dust clogging of the pre-unloader valve so that the hydraulic press can not operate normally.