What are the basic rules of shape symbols in hydraulic transmission system?

The basic provisions of graphic symbols of hydraulic transmission system include: terms and definitions, notes, general rules, hydraulic application examples, pneumatic application examples and basic elements of graphic symbols. Application rules and appendices.

When drawing a hydraulic system diagram, for the sake of simplification, hydraulic components are represented by specified symbols, which are called functional symbols. The mechanical energy of the prime mover is converted into the pressure energy of the liquid through the hydraulic pump, and the energy is transmitted through the change of the pressure energy of the liquid, and the change of the pressure energy of the liquid is transmitted through various control valves and pipelines.

With the help of hydraulic actuator (hydraulic cylinder or motor), liquid pressure energy can be converted into mechanical energy, thus driving the working mechanism and realizing linear reciprocating motion and rotary motion. Liquid is called working medium, generally mineral oil, and its function is similar to that of belt, chain and gear in mechanical transmission.

Hydraulic transmission system is a hydraulic system composed of hydraulic pump, hydraulic control valve and hydraulic actuator (hydraulic cylinder and hydraulic motor, etc.). ) and hydraulic accessories (pipes and accumulators, etc.). ).

Components of hydraulic transmission system:

1, the power component, namely the hydraulic pump, whose function is to convert the mechanical energy of the prime mover into the kinetic energy of liquid pressure (manifested as pressure and flow), and its function is to provide pressure oil for the hydraulic system, and the pressure oil is the power source of the system.

2. The executive element refers to a hydraulic cylinder or a hydraulic motor, whose function is to convert hydraulic energy into mechanical energy and do external work. The hydraulic cylinder can drive the working mechanism to realize reciprocating linear motion (or swing), and the hydraulic motor can complete rotary motion.

3. Control elements refer to various valves that use these elements to control and adjust the pressure, flow and direction of the liquid in the hydraulic system, so as to ensure that the actuator can work according to people's expected requirements.

4. Auxiliary components, including oil tank, oil filter, pipeline and joint, cooler, pressure gauge, etc. Their function is to provide necessary conditions for the normal work of the system and facilitate monitoring and control.

5. The working medium is transmission fluid, usually called hydraulic oil. The hydraulic system realizes movement and power transmission through the working medium. In addition, hydraulic oil can also lubricate moving parts in hydraulic components.