Analyze principle of hydraulic valve and hydraulic support

Hydraulic support is a supporting device in coal mining machinery. After overhauling it, it can be used for five years underground. However, the service life of various hydraulic valves in hydraulic support is very low. For a long period of 3 months and a short period of only a few weeks, Foreign solutions and ways to increase the filtration system to improve the quality and improve the quality of the emulsion, but with little success. To a British hydraulic valve, for example, although the processing accuracy and filtration of the entire hydraulic system are relatively high, but because of low life expectancy, has been facing the elimination of our country. Early hydraulic support, there is no other seal between the movement, is a metal direct contact seal, which requires seal contact surface match, with high processing accuracy, or must increase the sealing pair of bonding force, the contact surface of plasticity Deformation, blocking the leak channel. A complete hydraulic system consists of five parts, namely, power components, actuators, control components, parts and hydraulic oil. The purpose of the power element is to convert the mechanical energy of the prime mover into the pressure energy of the fluid, referring to the oil pump in the hydraulic system, which powers the entire hydraulic system. The structure of the hydraulic pump are generally gear pump, vane pump and piston pump. Actuators (such as hydraulic cylinders and hydraulic motors) have the effect of converting the pressure of the fluid into mechanical energy that drives the load for linear reciprocating motion or slewing motion. Control elements (ie, various hydraulic valves) control and regulate the pressure, flow and direction of the fluid in the hydraulic system. According to the different control functions, hydraulic valves can be divided into the village of control valves, flow control valves and directional control valves. Pressure control valve is divided into the benefits of flow valve (safety valve), pressure relief valve, sequence valve, pressure relay, etc .; flow control valve, including throttle, regulating valve, shunt manifold, etc .; directional control valve including check valve, Hydraulic check valve, shuttle valve, reversing valve. According to different control methods, hydraulic valves can be divided into the switch-type control valve, the value of the control valve and proportional control valve. Auxiliary components, including fuel tanks, oil filters, tubing and fittings, seals, pressure gauges, oil level oil temperature meter. Hydraulic fluid is the hydraulic system in the transmission of energy working medium, a variety of mineral oil, emulsion and synthetic hydraulic oil and other categories.