1、 Open system and closed test system

Open system, in which the hydraulic pump removes oil from the car oil tank and the electric actuator pumps oil back to the car oil tank. 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 electric actuator returns to the inlet of the pump. Conveyor belt cycloidal hydraulic motor 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 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 component 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 systems fall into this category.

Hydraulic control system, hydraulic control system is often 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 addition of inspection opinion feedback, the system can use general components to form an accurate control system, and its handling quality is less affected by the standard change in work. Hydraulic control system is widely used in high-precision CNC lathe, metallurgical industry, aviation companies, aerospace and other industries.