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我校用1台GJW111型挖掘机进行故障排查培训时,将该挖掘机先导压力由标准的4MPa调低至1MPa,以模拟“工作装置动作缓慢”的故障现象。将该机先导压力调低后,“动作缓慢”演示目的实现。演示完毕后将发动机熄火,但再次启动,扳动动臂、斗杆、回转操纵手柄均无任何动作。该挖掘机设有蓄能器,其作用是当发动机熄火后先导泵不能正常供油时,为制动系统提供油源。先导泵出口处设有单向阀,用于防止发动机熄火后蓄能器的油液倒流回先导泵。演示时将先导压力调低,当发动
When I used one GJW111 excavator for troubleshooting training, I lowered the excavator pilot pressure from standard 4MPa to 1MPa to simulate the phenomenon of “slow working device”. The aircraft pilot pressure down, “slow action ” demonstration purposes. After the demonstration, the engine will turn off, but start again, pull the boom, stick, rotary handle without any action. The excavator is equipped with an accumulator, whose function is to supply oil to the braking system when the pilot pump can not supply oil normally when the engine is off. A pilot valve is located at the outlet of the pilot pump to prevent the accumulator fluid from flowing back into the pilot pump after the engine has stopped. Demonstration pilot pressure will be lowered, when launched