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增速缸是一种复合缸，其活塞内含有柱塞缸，中空的柱塞又和增速缸缸体固连500吨框架式液压机。当换向阀2的左位接入系统工作时单柱液压机，泵输出的压力油先进入工作面积小的柱塞缸内，使活塞快进；增速缸I腔内出现真空，在图4a中便通过单向阀7、而图4b中则通过复合式顺序阀8向I腔补油，实现快进。

活塞快进结束转为工进时，系统油压上升，在图8b中，复合式顺序阀8控制口压力也上升，使阀芯动作，阀口切换；在图8a中，是使电磁铁3YA通电拉伸液压机，二位二通阀4的右位接入系统工作；这时压力油同时进入增速缸I腔和Ⅱ腔，因工作面积增大，便获得了大推力和低速度，实现了工进。

YEYAJISUDUSUDUMANDEYUANYIN？

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其实液压机的工作速度由工作流程决定，液压泵的功率与工作压力和流量的乘积成正比框架式液压机，当液压机返回时，液压机负荷小，工作压力低。因此可以在不超过液压泵输出功率的情况下增加流量，即增加液压机的运行速度。

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