附件24.3 11 Problem 8-1 -Operating pump((工作泵)2-Auxi证 Pmp(助系)3 Seering pump(转向泵》 4 Flow switching valve(流量转换阀)5-Safety valve(安全阀)6-Steering valve (转向阀)7-Steering cylinder(转向缸)&-Boom cylinder(动臂缸)9-Buchet cylinder(铲斗缸)l0-Double acting safety valve(双作用安全阀)l-Multiple Directional control valve(多路换向阀) 8-2 The principle chart of a shearing machine hydraulic system is shown in the figure.The scissors move up and down driven by the main cylinder.The working circle is:start without load- -idle -down stroke with cushion- -return stroke at a high speed.The main cylinder can stop and retract any time during the down stroke.In order to locate the scissors.the main cylinder must has the cating ine under light the force applying on the scissors in their retum stroke (1)What is the operating principle of this shearing machine hydraulic system?Mark the oil flow directions of each action and make a list of the solenoid action sequence (2)What are the functions of valves 5,2.1,and 10 in this system?附件 24.3 Problem 8-1 1-Operating pump(工作泵) 2-Auxiliary pump(辅助泵) 3-Steering pump（转向泵） 4-Flow switching valve（流量转换阀） 5- Safety valve（安全阀）6-Steering valve （转向阀）7-Steering cylinder（转向缸）8-Boom cylinder（动臂缸）9-Buchet cylinder（铲斗缸）10-Double acting safety valve（双作用安全阀）11- Multiple Directional control valve（多路换向阀） 8-2 The principle chart of a shearing machine hydraulic system is shown in the figure. The scissors move up and down driven by the main cylinder. The working circle is: start without load——idle stroke——cutting——down stroke with cushion——return stroke at a high speed. The main cylinder can stop and retract any time during the down stroke. In order to locate the scissors, the main cylinder must has the capacity of locating line under light pressure, then the force applying on the scissors in their return stroke would be quite small, not to damage the plate material. (1)What is the operating principle of this shearing machine hydraulic system? Mark the oil flow directions of each action and make a list of the solenoid action sequence. (2)What are the functions of valves 5, 2, 1, and 10 in this system?