How is the high speed of the mechanical speed press machine obtained

When using the mechanical speed press machine, the high and low pressure oil pumps work at the same time to do work. At low speed, only the high pressure oil pump does work, and the low pressure oil pump stops doing work.

Take the mechanical speed press machine as an example: press the "press" button, the electromagnets YV1, YV3, YV4 are energized at the same time, YV1 makes the system build up pressure, YV3 makes the lower chamber of the main cylinder and the fuel tank connect, and YV4 makes the pressure oil enter the upper chamber of the cylinder, The slider moves downward rapidly under the action of gravity; when the slider collides with the travel switch SQ2, SQ2 sends a signal to turn off YV3 and turn on YV2, which cuts off the oil return circuit between the lower chamber of the main cylinder and the fuel tank, and the slider cannot be under its own weight. Under the action of the downward movement, the pressure of the master cylinder rises under the action of the oil pressure. When the pressure rises to the pre-adjusted pressure of the pressure regulating valve, the hydraulic oil in the lower chamber of the oil cylinder will reach the oil tank under the pressure, and the slider will be under the pressure. Under the action of oil, it goes down slowly, and starts to pressurize after contacting the workpiece. When the pressure rises to the set value of the electric contact pressure gauge, a signal is sent, and YV1, YV2, and YV4 are powered off. At this time, the system is in an idling state, so that the master cylinder is in When the pressure is maintained, at the same time, the time relay KT1 counts, and when the predetermined time is reached, a signal is sent to turn on the electromagnets YV1, YV2, and YV5, and the upper chamber of the master cylinder is relieved of pressure. When the pressure drops to the predetermined pressure, the time relay KT3 sends a signal to make YV2 When the power is off, the return stroke of the slider rises. When the slider hits the travel switch SQ1, YV1 and YV5 are powered off, the return stroke stops, and the system is in an idling state.

The mechanical speed press machine consists of two cylinders of different sizes. Filling the liquid cylinder with water and using water as the power medium is called a "hydraulic press". The hydraulic cylinder is filled with oil, and oil is used as the power medium, which is called "hydraulic press".

The mechanical speed press machine has a movable piston in each of the two cylinders. If a certain amount of pressure is added to the small piston, according to Pascal's law, the small piston will transmit this pressure to the large piston through the pressure of the liquid, and the large piston will be transferred to the large piston. The piston goes up.