The areas of the large and small plungers are S2 and S1 respectively, and the forces on the plungers are F2 and F1 respectively. According to Pascal's principle, the pressure of a closed liquid is equal everywhere, that is, F2/S2=F1/S1=p; F2=F1(S2/S1). It represents the gain effect of hydraulic pressure. Like mechanical gain, the force increases, but the work does not gain. Therefore, the movement distance of the large plunger is S1/S2 times the movement distance of the small plunger.
The basic principle is that the oil pump delivers the hydraulic oil to the integrated cartridge valve block, and distributes the hydraulic oil to the upper or lower cavity of the cylinder through various one-way valves and overflow valves, and makes the cylinder move under the action of high pressure oil. It is a device that uses liquid to transmit pressure. When the 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 executive mechanism, an auxiliary mechanism and a working medium. The power mechanism usually uses an oil pump as the power mechanism, which is generally a product oil pump. In order to meet the requirements of the motion speed of the actuator, one oil pump or multiple oil pumps are selected. Gear pumps for low pressure (oil pressure less than 2.5MP); vane pumps for medium pressure (oil pressure less than 6.3MP); plunger pumps for high pressure (oil pressure less than 32.0MP). Pressure processing and forming of various plastic materials, such as extrusion, bending, deep drawing of stainless steel plates and cold forming of metal parts. It can also be used for pressing powder products, grinding wheels, bakelite, and resin thermosetting products.
