The hydraulic system consists of 7 control valves (boom, stick, bucket, slewing, two travel and standby), 5 control valves (straight travel valve x, boom merge valve y, arm merge valve w, fuel supply valve u and the fuel supply valve v) some check valves and orifices, as shown in Figure 8. For the description of the Carter multi-way valve hydraulic system, see Literature 1.2].
Pump supply route
1) The P1 pump is connected to the left valve group through the oil supply channel.After the priority is provided for walking, the oil is returned to the w valve through the three valves of the standby, bucket and boom.If the w valve is closed, the oil can be supplied to the stick valve through the check valve. .
2) The P2 pump is connected to the parallel oil supply channel of the right valve group, which supplies oil to the rotary, stick (via v valve) and y valve in parallel. P1 pump
And P2 pumps switch the connection relationship with the left and right valve groups through the x valve. As shown in Figure 7, the P2 pump is connected to the left valve group in parallel with the oil supply channel, and the P1 pump is connected to the right valve group through the oil supply channel.
3) The parallel supply channel of the left valve group supplies oil in parallel to the spare, bucket and boom, and can supply oil to the stick valve through the u valve
4) The right valve group is directly connected to the oil supply channel for priority travel, and the stick valve is supplied through the rotary valve, and then the oil is returned through the y valve.
5) When the x valve is in the right position, the P1 pump is connected to the left and right valve groups through the oil supply channel, and the P2 pump is connected to the left and right net groups in parallel to the oil supply channel; when the x valve is in the left position, the P1 pump and the left valve group are connected to the oil supply channel and in parallel The oil supply passage is connected, and the P2 pump is connected to the right valve group through the oil supply passage and the parallel oil supply passage.
Second, the operation of five control valves The role of the control valve is to change the fuel supply route and fuel supply method.
The operation control adopts three methods: pilot control oil linkage operation, control valve linkage operation and solenoid valve control.
The operation control situation is shown in Table 1.
