Talking about how to maintain and use the hydraulic pump

1, to ensure the normal state of the system hydraulic pump The problem of hydraulic oil has always been considered to be the culprit leading to hydraulic system failure, due to space limitations, not repeat them here, only some of the typical problems to make some explanations. 2, the viscosity of the oil should meet the requirements, such as ZB-type hydraulic pump recommended using small changes in viscosity with the hydraulic oil, the viscosity range of 20 ~ 100cst less than the ambient temperature above 15 ℃, the proposed use of thick 40-3, 30 # machine oil, 30 # machine hydraulic oil, the ambient temperature below 25 ℃, it is recommended to use YH-10 aviation hydraulic oil; domestic α and CB-4 gear pump, YB-type vane pump recommended 20 machine oil. Maintain the hydraulic pump clean to maintain a certain degree of oil filter accuracy 1), the axial piston pump end clearance can automatically compensate for small gaps, thin oil film, oil filtration requirements of the highest precision. 2), sloping disc axial piston pump oil filter accuracy of 10 ~ 15μm. 3), wear and tear caused by solid impurities, capacity and efficiency decline, leading to the through-hole, variable bodies, parts, such as blockage and jamming. 4) Once the oil pollution, should be replaced, and rinse with clean oil. 4, hydraulic oil pump oil temperature appropriate 1), the general working oil temperature should be 10 ~ 50 ℃, the maximum should be less than 65 ℃, local short-term should be less than 90 ℃. 2), low temperature should be light or no load to start until the normal oil temperature and then resume normal operation. Generally by the temperature below 10 ℃, should be no-load operation for more than 20min to load: If the temperature below 0 ℃ or above 35 ℃, should be heated or cooled; regional or winter start should make the oil temperature rose above 15 ℃ Can load; not allowed to start below -15 ℃. 3) When working, it is strictly forbidden to fill the hot oil with cold oil, or to fill the cold oil with hot oil, so as to prevent the temperature difference from being too big, expanding or shrinking and killing. In winter or cold areas, if the electric heater is used to heat the oil in the fuel tank, special attention should be paid when using the pump and the motor are still cold and easy to die. 5, to ensure normal working conditions 1), the normal inhalation conditions Although the hydraulic pumps are positive displacement pumps, have a certain self-priming capacity, but the friction within the sealing surface of mercury, self-absorption capacity is limited, especially the internal pump flow channel complex , The general suction height (fuel tank to the pump center) is low, about 12 ~ 50cm, and some mercury expressly prohibits self-absorption, such as ZB227 type, it should consider its inhalation conditions, minimize inhalation resistance : 2), Suction tube shall not be installed filters, or negative suction high or auxiliary pump oil supply; 3), it is best to make the tank above the suction pump, or auxiliary pump oil. Such as: ZB type hydraulic pump (except ZB227 type) at the rated speed (1500r / min) below the following, allowing self-absorption, but this will result in a decline in capacity and the number of about 5%, and will inevitably affect its service life, manufacturers Generally do not recommend this method of use; most manufacturers recommend the use of sub-pump oil, when the pressure is about 0.7MPa. CY type oil mercury in the rated speed operation, allowing self-absorption, oil absorption height ≤ 500mm, at the maximum speed of operation, and the oil pipe is small, allowing the flow column height, oil absorption height of 300 ~ 500mm, when the pipeline resistance than Large, the pump must be used for auxiliary mercury supply, supply pressure ≤ 0.4Mpa.

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