1、 Open system and closed test system

For open system, the hydraulic oil pump of this type of system removes oil from the car oil tank, and the actuator pumps oil back to the car oil tank. Brake hydraulic motor The system must have a large capacity of car fuel tank. Such systems are more widely used.

Closed test system: in the closed test system, the hydraulic oil discharged from the actuator returns to the inlet of the pump. The system has high efficiency, so the steam make-up oil pump shall be used to replenish the oil, and the flushing valve shall be used to replace the oil, and the heat exchanger shall be carried out. This kind of system is mostly used for vehicles, hoisting and conveying machinery, ships Hoisting gear , paper industry, textile and other industrial equipment.

II Hydraulic transmission System and hydraulic press control system

Hydraulic transmission system, the hydraulic transmission system is generally an open-loop gain system without feedback, which is dominated by the transmission of driving force, followed by the transmission of information, and pursues the perfection of transmission system characteristics. The working characteristics of the system are defined by the characteristics of each hydraulic system and their interaction, and its working quality is greatly endangered by the change of working standards. Hydraulic transmission system is widely used. Most industrial equipment hydraulic press systems fall into this category.

Hydraulic press control system, hydraulic press control system is mostly a closed loop control system with feedback composed of hydraulic pressure regulating valves such as hydraulic valves, which is dominated by information transmission, followed by transmission of driving force, and pursues perfect control characteristics. Because of the added feedback of inspection opinions, the system can use ordinary components to form an accurate control system, Traveling cycloid motor The manipulation quality is less harmed by the standard change in the work. Hydraulic machine control system is widely used in high-precision CNC lathe, metallurgical industry, aviation companies, aerospace and other industries.

3、 Valve control system, pump control system and actuator control system

Valve control system: the valve control system controls the total flow according to the opening degree of the throttle port of the changed valve, and then controls the rate of the actuator. Because there are throttle valves and overflow damages, the efficiency is generally low. Valve control system is basically used for various industrial equipment.