Precautions for choosing hydraulic pump:
The rated working pressure of the hydraulic pump is generally 25-60% larger than the maximum working pressure; the maximum pressure on the product sample is the allowable pressure during short-term impact, so it is forbidden to have impact pressure in each working cycle to avoid shortening the hydraulic pressure The service life of the pump is even damaged, and the oil drain pressure should not be too high, otherwise the oil pump will be easily damaged.
Hydraulic cylinder is the actuator of the entire hydraulic equipment, so it is particularly important when selecting the model. Never use non-standard cylinders. The safety factor of the hydraulic cylinder should not be too small. Don't ignore the cylinder barrel, earrings and pin of the hydraulic cylinder. The geometric tolerance. In order to reduce the pneumatic pressure of the hydraulic cylinder and ensure that there is no "suffocation" phenomenon in the movement, sufficient attention should be paid to the type tolerance of the hydraulic cylinder.
Hydraulic motors are also an important actuator of hydraulic equipment. Regarding the options of hydraulic motors, the following points should not be ignored: When the load torque is constant, the displacement is inversely proportional to the pressure, that is, the pressure is high and the displacement is small; The displacement is large, so the displacement is an important indicator of the working capacity of the hydraulic motor. The rotation speed of the hydraulic motor cannot be too low or too high. When the rotation speed of the hydraulic motor is too low, it will crawl due to the unstable friction and leakage, which will seriously affect the stability of the working parts. In order to expand the speed range, the lowest speed of the multi-selected motor should be as small as possible.
Precautions for hydraulic control valve selection: The rated pressure of the hydraulic valve should generally be close to its operating pressure, but for systems with higher reliability requirements, the valve's rated pressure should be much higher than its operating pressure.
Flow and diameter selection taboo: Flow is mainly used to indicate the specifications of medium and low pressure hydraulic valves. The rated flow of taboo suppression valve is too much different from the actual use flow, otherwise the volume loss will be too large. The nominal size of the inlet and outlet of the hydraulic valve is called the diameter, which is mainly used to indicate the specifications of the medium and high pressure series of hydraulic valve products. However, hydraulic valves with the same diameter but different forms may not have the same rated flow under different pressures. The designer should select the appropriate diameter according to the use pressure and flow and the hydraulic valve characteristic curve of the hydraulic component manufacturer.