The working principle of hydraulic press. The areas of the large and small plunger are S2 and S1, respectively, and the forces acting on the plunger are F2 and F1. According to the Pascal principle, the pressure of the sealed liquid is equal everywhere, that is, F2/S2=F1/S1=p; F2=F1 (S2/S1). The gain effect of hydraulic pressure is similar to mechanical gain, where the force increases but the work does not gain. Therefore, the movement distance of the large plunger is S1/S2 times that of the small plunger.
The basic principle is that the oil pump delivers hydraulic oil to the integrated plug-in valve block, and the hydraulic oil is distributed to the upper or lower chambers of the oil cylinder through various one-way and overflow valves. Under the action of high-pressure oil, the oil cylinder moves. Hydraulic press is a device that uses liquid to transmit pressure. When a liquid transfers pressure in a closed container, it follows Pascal's law. The hydraulic transmission system of a four column hydraulic press consists of a power mechanism, a control mechanism, an actuator, an auxiliary mechanism, and a working medium. The power mechanism usually uses an oil pump as the power mechanism, usually an integral oil pump. To meet the speed requirements of the actuator, one or more oil pumps are selected. Gear pump for low pressure (oil pressure less than 2.5MP); Vane pump for medium pressure (oil pressure less than 6.3MP); Use a plunger pump for high pressure (oil pressure less than 32.0MP). The pressure processing and forming of various plastic materials, such as extrusion, bending, deep drawing of stainless steel plates and cold pressing of metal parts, can also be used for pressing powder products, grinding wheels, gluewood, and resin thermosetting products.