Equilibrium jack is key control component of two-column shield support,safety valve would frequency injecting with normal bidirectional lock control model,and it could not adapted automation control requirements. Detailed rigid-hydraulic plane motion model of tow-column hydraulic shield support was built by software AMESim,the situation that roof variation with incline angle 5°was simu-lated before and after support movement,and different hydraulic support pose and equilibrium jack response process were compared under different control models,which include normal bidirectional lock control model and differential action control model,low-pres-sure control and floating bidirectional lock control model. The results showed that the safety valve could be avoided frequency open un-der the later three control model,the best decompression result was low-pressure control,the floating bidirectional lock control was the second,but inflecting hazard would appeared during differential control process,under passive control model ,the leading end of top beam would approached roof under differential control and low-pressure control,but the rear end of top beam would approached roof firstly under floating bidirectional lock control. It references for model selection and optimization of equilibrium jack control system.%平衡千斤顶是两柱掩护式液压支架的重要调控部件,常规双向锁控制模式易造成安全阀频繁喷液,不能很好适应自动化控制要求.利用AMESim软件建立了某两柱掩护式液压支架刚-液平面运动模型,模拟移架前后顶板5°倾角变化条件,比较了传统双向锁控制模式和差动控制、低压控制和浮动双向锁控制模式下液压支架姿态和平衡千斤顶响应过程.结果表明:后3种控制模式均可有效避免安全阀开启,降压效果方面低压控制最优、浮动双向锁次之,差动控制有喷液风险;非主动调控模式下,差动控制和低压控制模式顶梁前端先接顶,浮动双向锁控制顶梁后端先接顶.研究结果为平衡千斤顶控制系统的选型和优化提供新参考.
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