本文提出在大型机械式挖掘机的提升电流信号回路中，增加继电器调节环节的方法求得提升力与推压力的合理匹配。
It is proposed in this paper that a relay regulating loop be added in the hoist current signal of large power shovel so that rational coordination between hoist and crowd capacities can be obtained.
采用双缸驱动，机械同步，举升力大；
Double cylinder drive, mechanical synchronization, large lifting force.
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