Hydraulic control circuit design
Vehicle handling uses a Electric fork over stacker lift hydraulic oil into the throttle control circuit shown in Figure 5 . The hydraulic control circuit using bidirectional shunt valve F1, F2, F3 synchronization circuit constituted so that the two hydraulic cylinders A1, A2 and B1, B2, at any transient can get the same amount of hydraulic oil , to achieve synchronization. Throttle circuit J1, J2, J3 for regulating the flow to control the speed of the piston rod , the direct control of back pressure balance valve Z to prevent the downward stroke of the piston rod when the slide quick drum lifter valve as Y safety valve from the overload effect. Solenoid valve C, D to achieve the commutation circuit .
2.4.2 Analysis of the control valve action
Be seen from Figure 5. Individually controlled ~ IJlDT, 2DT can achieve rising platform , down motion , joint control 1DT, 3DT platform can rotate upward , joint control 2DT, 3D rotating platform in order to achieve Arab downward movement controls only 3DT can not change the platform , thus from the control mode, ensure that the system is safe and reliable .
2.4.3 to determine the source of oil control device
According to the hydraulic cylinder working pressure and work flow , to determine the system working pressure ( maximum of about 18.3MPa) and total flow (2.441 / m). Selected hydraulic pumps, hydraulic cylinders, hydraulic valves, controllers and hydraulic pipes, hydraulic oil , and then select the motor power (1.5kW) According pump power . At this point the entire hydraulic control system is completely determined.
Shanghai Posts and Telecommunications Equipment Co., Ltd. in July 2000 will YBY01 car handling hydraulic lifts for mounting on the Shanghai Post Office belongs to a Qingling van, shown in Figure 6 . The device is installed using the car from Figure 6 is installed with handling hydraulic lifts , has been operating normally. Proves YBY01 car with handling hydraulic lifts stable performance , fully comparable to similar products at home and abroad . Meanwhile, one less than the price of similar foreign products dichotomy , if gradually promote the use , will save the country a lot of foreign exchange . Not only economical . And practical.