Hydraulic jack schematic

Probe domestic PL75-B needle diameter 1.02 thimble total length 33.35MM thimble

TP-IP4220CZ6 5V 0.35PF breakdown voltage 6V SOT

Shunuo varistor / ESD varistor / product complete / Sunlord first-class agent

Hydraulic jack schematic

Figure 1-1 Working principle of hydraulic jack

1—Lever handle 2—small cylinder 3—small piston 4,7—check valve 5—suction pipe 6,10—pipeline

8—large piston 9—large cylinder 11—stop valve 12—fuel tank

Figure 1-1 is a working principle diagram of a hydraulic jack. The large cylinder 9 and the large piston 8 constitute a lifting hydraulic cylinder. The lever handle 1, the small cylinder 2, the small piston 3, the check valves 4 and 7 constitute a manual hydraulic pump.

If the handle is lifted to move the small piston upward, the volume of the oil chamber at the lower end of the small piston is increased to form a partial vacuum. At this time, the check valve 4 is opened, and the oil is sucked from the oil tank 12 through the oil suction pipe 5; the handle is pressed down, and the small piston moves downward. The pressure in the lower chamber of the small piston rises, the check valve 4 is closed, the check valve 7 is opened, and the oil in the lower chamber is input into the lower chamber of the lift cylinder 9 via the pipe 6, forcing the large piston 8 to move upward and lift the heavy object. When the handle is sucked again, the check valve 7 is automatically closed, so that the oil cannot flow back, thereby ensuring that the weight does not fall by itself.

By continuously reciprocating the handle, the oil can be continuously hydraulically pumped into the lower chamber of the lifting cylinder, so that the weight gradually rises. If the shut-off valve 11 is opened, the oil in the lower chamber of the lift cylinder flows back to the tank through the pipe 10 and the shut-off valve 11, and the weight moves downward. This is how the hydraulic jack works.

Through the analysis of the working process of the hydraulic jack above, the basic working principle of the hydraulic transmission can be initially understood. The hydraulic drive uses pressurized oil as the working medium for transmitting power.

When the lever is pressed, the small cylinder 2 outputs the pressure oil, which is the pressure energy for converting the mechanical energy into the oil. The pressure oil passes through the pipe 6 and the check valve 7, and pushes the large piston 8 to lift the heavy object, which is the pressure energy of the oil. It is converted into mechanical energy. The speed at which the large piston 8 is lifted depends on the amount of oil flowing into the large sump 9 per unit time. It can be seen that the hydraulic transmission is a conversion process of different energies.