Hydraulic control


Hydraulic control refers to the use of liquid power to change the working state of the controlled object. It is based on the transfer of pressure by a liquid (usually hydraulic oil) in a closed system to achieve control of machinery or equipment. The hydraulic control system uses a motor as the power base, and a hydraulic pump is used to convert mechanical energy into pressure to push the hydraulic oil. By controlling various valves, the flow direction of hydraulic oil is changed, so as to promote the hydraulic cylinder to make different strokes and different directions, and complete the different actions of various equipment.


Hydraulic control systems are widely used in many fields, including the following fields:

1. Iron and steel manufacturing industry: In the steel plant, the hydraulic control system is widely used in the rolling equipment and shearing equipment on the hot and cold rolling production lines. Through precise hydraulic control, these equipment can achieve high-speed, continuous and stable production, ensuring the quality and production efficiency of steel products. At the same time, in the casting process, the innovative application of the hydraulic press control system can realize the high-precision control of high-pressure casting, mold adjustment and other processes, and improve the stability and reliability of the molding process.

2. Aerospace field: hydraulic control plays a key role in the manufacture and maintenance of aero engines. It can realize high-precision machining and assembly of internal components of aero engines to ensure the performance and reliability of aero engines. In addition, in the manufacturing and maintenance process of aircraft components such as aircraft landing gear and flaps, hydraulic control can also achieve complex process requirements through precise power control, and improve the production efficiency and reliability of aircraft components.

3. Construction machinery: construction machinery, including excavators, loaders, bulldozers, road rollers, etc., is widely used in hydraulic systems. These systems are mainly used in various working devices and drive systems, such as steering, braking, transmission, etc., and their reliability and stability are crucial to the operation and safety of construction machinery.

4. Agricultural machinery: Tractors, combine harvesters, sprayers and other agricultural machinery also use a large number of hydraulic systems. These systems are mainly used for steering, braking, lifting, adjusting, etc., which not only improves the efficiency and productivity of agricultural machinery, but also increases the income of farmers.

5. National defense industry: In the field of national defense industry, hydraulic control technology has also been fully applied. Hydraulic control technology is used in a variety of weapons and equipment such as tanks, ships, radars, self-propelled guns, etc. For example, the performance of Chinese weapons and equipment in the SCO Peace Mission joint military exercise fully illustrates the important role of hydraulic control technology in the field of military engineering.


The basic principle of the hydraulic control system is: the motion control system receives the actual position signal uploaded by the hydraulic cylinder and motor measured by the sensor, compares it with the control command signal that needs to be issued, amplifies the error signal through the servo amplifier, and converts the current signal into the amount of hydraulic oil by the electro-hydraulic servo valve in a certain proportion to promote the movement of the cylinder and achieve the movement function of controlling each joint. At the same time, the rotation angle of each joint is transmitted through the potentiometer and fed back to the industrial computer to form a closed-loop control.


force controlling hydraulic device

electro proportional controls


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