The invention discloses a tractor saddle lifting control hydraulic system which comprises an oil tank, a power pump, a lifting oil cylinder and a three-position four-way reversing valve, a rod cavity and a rodless cavity are formed in the lifting oil cylinder, the three-position four-way reversing valve is provided with an oil supply port P, an oil return port T, a working port A and a working port B, the working port A is connected with the rodless cavity through a first oil way, and the working port B is connected with the rodless cavity through a second oil way. The first oil way is connected with a first balance valve, the working port B is connected with the rod cavity through a second oil way, the second oil way is connected with a one-way overflow valve and a hydraulic control valve, the set pressure value of the one-way overflow valve is larger than the pilot oil pressure of the first balance valve, and a third oil way is arranged between the hydraulic control valve and the oil tank. The third oil way is provided with a two-position two-way electromagnetic reversing valve, the two-position two-way electromagnetic reversing valve is provided with a first station and a second station, the three-position four-way reversing valve is provided with a third station, a fourth station, a fifth station and a fifth station, the two-position two-way electromagnetic reversing valve is synchronously located at the second station, a valve port of the two-position two-way electromagnetic reversing valve is opened for unloading, and the pressure of hydraulic oil entering the rod cavity is reduced.
本发明公开的一种牵引车鞍座举升控制液压系统,包括油箱、动力泵和举升油缸,举升油缸内设有杆腔和无杆腔,还包括三位四通换向阀其设有供油P口、回油T口、工作A口和工作B口,工作A口通过第一油路与无杆腔连接,第一油路上连接有第一平衡阀,工作B口通过第二油路与有杆腔连接,第二油路上连接有单向溢流阀和液压控制阀,单向溢流阀的设定压力值大于第一平衡阀的先导油压,液压控制阀与油箱之间设有第三油路,第三油路上设有两位两通电磁换向阀,两位两通电磁换向阀具有第一、二工位,三位四通换向阀具有第三、四、五工位,第五工位时两位两通电磁换向阀同步位于第二工位,两位两通电磁换向阀的阀口打开卸荷,降低进入有杆腔的液压油压力。
Tractor saddle lifting control hydraulic system
一种牵引车鞍座举升控制液压系统
2025-03-25
Patent
Electronic Resource
Chinese
Saddle lifting control method and saddle lifting control system for riding equipment
European Patent Office | 2020
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