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In practice, Dalan Hydraulics tells you that from different angles, the hydraulic system can be divided into different forms. Refer to the following classification. In practice, Dalan Hydraulics tells you that the hydraulic system can be used from different angles. Divided into different forms, you can refer to the following classification:
1. According to the circulation mode of oil, the hydraulic system can be divided into open system and closed system.
1 Open system means that the hydraulic pump draws oil from the fuel tank. After the oil passes through various control valves, the hydraulic actuator is driven, and the oil is returned to the fuel tank through the reversing valve. The structure of the system is relatively simple, and can play the role of heat dissipation and sedimentation of the oil tank, but the oil often comes into contact with the air, so that the air easily penetrates into the system, resulting in unstable movement of the mechanism. The open system has a large fuel tank and the oil pump has good self-priming performance.
In the closed system, the oil inlet pipe of the hydraulic pump is directly connected to the oil return pipe of the actuator, and the working fluid is closed in the pipeline of the system. The compact structure has less chance of contact with air, and the air does not easily penetrate into the system, so the transmission is relatively stable.
3 The shifting and reversing of the working mechanism is realized by adjusting the variable mechanism of the pump or the motor, avoiding the hydraulic shock and energy loss occurring during the commutation of the open system.
4 Closed system is more complicated than open system, because there is no oil tank, oil heat dissipation and filtration conditions are poor. To compensate for leaks in the system, a small flow of charge pump and fuel tank is usually required. Due to the unequal flow of the single-rod double-acting cylinders, the power utilization is reduced during operation, so the actuators in the closed system are generally hydraulic motors.
2. According to the number of hydraulic pumps in the system, it can be divided into single pump system, double pump system and multi pump system.
3, according to the type of hydraulic pump used, can be divided into quantitative pump system and variable pump system.
The advantage of the 1 variable pump is that the power of the engine can be fully utilized within the adjustment range, but the structure and manufacturing process are complicated and the cost is high.
2 variable pumps are divided into manual variables, electro-hydraulic proportional control variables, servo variables, pressure compensation variables, constant pressure variables, hydraulic variables and other methods.
4, according to the different ways of supplying oil to the actuator, can be divided into series system and parallel system.
In a series system, the oil return of the last actuator is the oil entering the next actuator, and the pressure is reduced once for each actuator. In the series system, when the main pump supplies oil to the actuators controlled by the multi-way valve, as long as the outlet pressure of the hydraulic pump is sufficient, the recombination of the movement of the respective actuators can be achieved. However, since the pressure of the actuators is superimposed, overcoming the external load capacity will decrease as the number of actuators increases.
In a parallel system, when a hydraulic pump supplies oil to a set of actuators, the flow into each actuator is only a fraction of the output of the hydraulic pump. The distribution of the flow varies with the load on the upper and lower parts of each piece. First, the actuators with smaller external loads are entered. Only when the external loads on the actuators are equal, the simultaneous action can be realized.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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