Hydraulic control


Hydraulic control, as an important part of the hydraulic system, mainly depends on the liquid power to change the working state of the control object. Here's a closer look at hydraulic control:

First, Definitions and Principles

Hydraulic control refers to a technology that uses liquid power to change the working state of the manipulated object. The principle is based on Pascal's principle, which states that the pressure acting on the liquid inside a closed container can be transmitted in all directions without changing the magnitude.

Second, Classification

1. According to whether the structure of the control system constitutes a closed loop, hydraulic control can be divided into open-loop control and closed-loop control (feedback control).

Open-loop control: The system output does not participate in the control process, and the control accuracy is relatively low.

Closed-loop control (feedback control): The output of the system participates in the control process through the feedback link, forming a closed loop with high control accuracy.

2. According to the type of control components, it can be divided into: hydraulic valve control and hydraulic pump control.

Hydraulic valve control: Control the flow, pressure and direction of the liquid by adjusting the size of the opening of the hydraulic valve.

Hydraulic pump control: control the working state of the hydraulic system by adjusting the output flow and pressure of the hydraulic pump.

Third, the field of application

Hydraulic control is widely used in a variety of industrial equipment and mechanical installations, including but not limited to the following fields:

1. Aerospace: aircraft flight control system, flight simulator, etc.

2. Metallurgical field: rolling mill downward pressure control system, steel belt deviation control system, etc.

3. Weapons and equipment: tank artillery stabilization system, self-propelled artillery driving assistance system, etc.

4. Robots: humanoid robots, bionic robot animals, etc.

5. Test device: load simulator, motion simulator, three-axis simulation turntable, earthquake simulator, etc.

6. Manufacturing equipment: CNC machine tools, wire cutting machine tools, etc.

Fourth, the basic composition

A hydraulic control system usually consists of the following components:

1. Power source: such as hydraulic pump, which provides power for the system.

2. Actuators: such as hydraulic cylinders and hydraulic motors, convert the pressure energy of the liquid into mechanical energy.

3. Control mechanism: including various hydraulic valves, which are used to regulate and control the liquid flow, pressure and direction in the system.

Fifth, the development trend

With the progress of science and technology and the development of industry, hydraulic control technology is constantly updated and improved. The development trend of hydraulic control in the future mainly includes the following aspects:

1. Electro-hydraulic control technology: through the combination of computer and control technology, the accurate and flexible control of the hydraulic system is realized.

2. Energy-saving technology: reduce the energy consumption of the system by optimizing the design and control strategy of hydraulic components.

3. Efficient and intelligent technology: use efficient hydraulic components and intelligent control technology to improve the efficiency and reliability of the system.

4. Lightweight technology: reduce the weight and volume of the hydraulic system by using lightweight materials and structural design.

5. Environmental protection technology: use environmentally friendly hydraulic oil and hydraulic components to reduce the impact of the system on the environment.


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