江苏省无锡市某机械厂生产的50和200吨力手掀泵式压力试验机,是用于试验各种建筑材料抗压强度的试验机。这种机器在启动时常发出一种刺耳的怪叫声。怎样解决这个问题呢?我们分别对三台怪叫机器进行了测试,几经检修,基本得到解决。具体修理方法是:将单向阀(见图)的两只紧固拼帽拆下,更换单向阀座的锥形弹簧,弹力大些,或把锥形弹簧稍拉长,以适当 The 50- and 200-ton force lift pump pressure tester produced by a mechanical plant in Wuxi, Jiangsu Province is a testing machine used to test the compressive strength of various building materials. This type of machine often emits a harsh, squeaky sound at startup. How to solve this problem? We have separately tested three bizarre machines and have basically solved them after several repairs. The specific repair method is: remove the two fastening caps of the one-way valve (see the figure), replace the conical spring of the one-way valve seat, increase the elastic force, or slightly elongate the conical spring, so as to properly