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公开(公告)号：US11827456B2
公开(公告)日：2023-11-28
申请号：US17258017
申请日：2018-07-06
发明人： Stefan Hasler , Christian Umundum
IPC分类号： B65G23/36 , B65G15/08 , F15B11/024
CPC分类号： B65G23/36 , B65G15/08 , F15B11/024 , F15B2211/20576 , F15B2211/6306 , F15B2211/6653 , F15B2211/7058 , F15B2211/7142 , F15B2211/75 , F15B2211/76
摘要： A hydraulic system is arranged to control a plurality of drive motors suitable for driving conveying apparatus such as a conveyor belt. The hydraulic system includes a modular master and slave hydraulic units implemented as hydraulic circuits in which pressure sensors and pressure reducing valves provide speed, torque and directional control.
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公开(公告)号：US11808012B2
公开(公告)日：2023-11-07
申请号：US17637550
申请日：2019-08-27
IPC分类号： E02F9/22 , F15B11/044 , F15B11/04 , E21D9/10 , F15B11/10
CPC分类号： E02F9/226 , E02F9/2296 , E21D9/1026 , F15B11/0413 , F15B11/0445 , F15B11/10 , F15B2211/20546 , F15B2211/5059 , F15B2211/50581 , F15B2211/6313 , F15B2211/7053
摘要： A hydraulic system, mining machine and method of controlling a hydraulic actuator. The hydraulic system (HS) is provided with a control valve (23) for controlling movement direction and speed of a hydraulic actuator (HA) connected to the system. Generated force of the hydraulic actuator is controlled independently relative to the control valve by means of counterbalance valves (Cb1, Cb2) and servo valves (Sv1, Sv2) controlling their opening pressure. The counterbalance valves and the servo valves operate as a meter-out control assembly which controls flow of hydraulic fluid discharged from working pressure spaces (16a, 16b) of the hydraulic actuator. The disclosed system may be implemented to control a mining boom (3) of a mining machine (1).
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