Created on:2021-11-04 10:42

Composition of hydraulic transmission and graphical symbols of system

Composition of hydraulic transmission and graphical symbols of system

The hydraulic system is mainly composed of 5 parts.

1. Power element

The power element is an energy conversion device that converts the mechanical energy input by the prime mover into oil pressure energy. Its function is to provide pressure oil for the hydraulic system. The power components are various hydraulic pumps.

2. Actuator

The actuator is an energy conversion device that converts the pressure energy of oil into mechanical energy. Its function is to output force and speed (linear motion), or torque and speed (rotary motion) driven by pressure oil. Such components include various hydraulic cylinders and hydraulic motors.

3. Control adjusting element

The control adjusting element is a device used to control or adjust the pressure, flow and direction of oil in the hydraulic system to ensure that the actuator completes the expected work. This kind of components mainly include various and directional valves. Different combinations of these elements form hydraulic transmission systems with different functions.

4. Auxiliary components

Auxiliary components refer to oil tank, oil pipe, oil pipe joint,, oil filter, pressure gauge, flow meter and various sealing elements. These elements play the roles of heat dissipation and oil storage, oil transportation, connection, energy storage, filtration, pressure measurement, flow measurement and sealing to ensure the normal operation of the system. They are an indispensable part of the hydraulic system.

5. Working medium

The working medium plays the role of transmitting motion, power and signal in hydraulic transmission and control. The working medium is hydraulic oil or other synthetic liquid.

Graphical symbols for systems

The hydraulic transmission system diagram shown in Figure A and figure B is a semi-structured working principle diagram, which is intuitive, easy to understand, but difficult to draw. In order to facilitate reading, analysis, design and drawing of hydraulic system, the graphic symbols of hydraulic components are used at home and abroad in engineering practice. According to regulations, these graphic symbols only represent the function of the element, not the structure and parameters of the element, and are represented by the static state or zero position state of the element. If the hydraulic components cannot be expressed by graphical symbols, it is still allowed to use the semi-structural principle. China has formulated graphical symbols for hydraulic and pneumatic components (GB / T 786.11993), of which the most commonly used parts can be seen in the appendix. Figure C is the working principle diagram of the hydraulic transmission system of the reciprocating table of the machine tool in Figure B expressed by graphical symbols.


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