Views: 1 Author: Site Editor Publish Time: 2020-10-19 Origin: Site
The role of the hydraulic system is to increase the force by changing the pressure. A complete hydraulic system consists of five parts, namely power components, actuators, control components, auxiliary components (accessories) and hydraulic oil. Hydraulic systems can be divided into two categories: hydraulic transmission systems and hydraulic control systems. The hydraulic transmission system mainly transfers power and motion. The hydraulic control system must make the output of the hydraulic system meet specific performance requirements (especially dynamic performance). The hydraulic system mainly refers to the hydraulic transmission system.
A complete hydraulic system consists of five parts, namely power components, actuators, control components, auxiliary components (accessories) and hydraulic oil.
The function of the power element is to convert the mechanical energy of the prime mover into the pressure energy of the liquid. It refers to the oil pump in the hydraulic system, which provides power to the entire hydraulic system. The structure of the hydraulic pump is generally gear pump, vane pump, plunger pump and screw pump.
The function of the actuator (such as hydraulic cylinder and hydraulic motor) is to convert the pressure energy of the liquid into mechanical energy, and drive the load to perform linear reciprocating or rotary motion.
Control elements (i.e., various hydraulic valves) control and regulate the pressure, flow, and direction of the liquid in the hydraulic system. According to different control functions, hydraulic valves can be divided into pressure control valves, flow control valves and directional control valves. Pressure control valves include relief valves (relief valves), pressure reducing valves, sequence valves, pressure relays, etc.; flow control valves include throttle valves, regulating valves, diverter manifolds, etc.; direction control valves include check valves, hydraulic controls Check valve, shuttle valve, directional valve, etc. According to different control methods, hydraulic valves can be divided into on-off control valves, fixed value control valves and proportional control valves.
Auxiliary components include oil tank, oil filter, cooler, heater, accumulator, oil pipe and pipe joint, seal ring, quick-change joint, high pressure ball valve, hose assembly, pressure joint, pressure gauge, oil level gauge, oil Thermometer and so on.
Hydraulic oil is the working medium that transfers energy in the hydraulic system. There are several types of mineral oil, emulsion and synthetic hydraulic oil.
The hydraulic system consists of two parts: signal control and hydraulic power. The signal control part is used to drive the control valve in the hydraulic power part. The hydraulic power section is used to show the interrelationship between different functional elements. The hydraulic source contains a hydraulic pump, an electric motor, and hydraulic auxiliary components; the hydraulic control section contains various control valves for controlling the flow, pressure, and direction of the working oil; the executive section contains a hydraulic cylinder or a hydraulic motor, which can be selected according to actual requirements .When analyzing and designing actual tasks, a block diagram is generally used to display the actual operating conditions in the equipment. Open arrows indicate signal flow, while solid arrows indicate energy flow.