Plastic machine hydraulic pump and motor oil daily use and maintenance

Hydraulic pumps and oil motors inevitably experience faults during use. These faults can be classified as sudden and abrasive faults. Among them, the wear failure occurred in the latter part of the system work, mainly due to natural wear and tear caused by the parts of the system damage caused by mostly sealing material failure, actuator slowing down gradually, the impact is not significant; and Sudden failures often occur in the early stages of system work and system work in the interim, mainly due to managers in the use and maintenance of the operating requirements and procedures were not caused by the damage caused by the system most of the performance of the tanker Burning, oil motor crawling phenomenon, hydraulic components damaged, hydraulic pipeline rupture and other serious accidents, a great impact. The frequency of these failures and the daily use of maintenance and repair is closely related to the quality. In order to maintain its long-term good working condition and long service life, in addition to establishing and perfecting the necessary daily maintenance and maintenance system so as to reduce post-wear failure, the initial and medium-term emergencies should be prevented to the maximum extent Sexual accident. 1 to ensure the normal state of the hydraulic oil pump system The problem of hydraulic oil has always been considered as 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. 1.1 Hydraulic oil pump fluid viscosity should meet the requirements Such as the ZB-type pump recommended viscosity with the oil temperature changes in small hydraulic oil, the viscosity range of 20 ~ 100cst less than the ambient temperature above 15 ℃, the proposed use of thick 40-2, 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. 1.2 to keep the oil clean, maintain a certain degree of oil filter accuracy 1) axial piston pump end clearance can automatically compensate for the small gap, thin oil film, oil filtration requirements of the highest precision. 2) Slanting disc axial piston pump oil filter accuracy of 10 ~ 15μm. 3) wear and tear caused by solid impurities, the capacity and efficiency decline, leading to through-hole, variable bodies, parts, such as blockage and jamming. 4) once the oil pollution, should be completely replaced, and rinse with clean oil. 1.3 hydraulic oil pump temperature appropriate 1) - general operating 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 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, causing the expansion or shrinking to kill. 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. 2 to ensure the normal working conditions of the hydraulic pump 2.1 normal suction 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 pump internal flow path complex, General suction height (fuel tank to 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: 1) The suction pipe of the hydraulic pump shall not be equipped with a filter, otherwise it adopts the negative suction height or auxiliary pump oil supply; 2) It is best to make the fuel tank above the suction port of the pump or use the auxiliary pump to supply oil. Such as: ZB-type oil pump (except ZB227 type) at 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, the general factory This method of use is not recommended; most manufacturers recommend the use of sub-pump oil, when the pressure is about 0.7MPa. CY type oil mercury when operating at rated speed to allow self-absorption, oil absorption height ≤ 500mm, at maximum speed operation, and the suction pipe is small, allowing the flow column height, oil absorption height of 300 ~ 500mm, when the pipe resistance Larger, the pump must be used for auxiliary mercury supply, supply pressure ≤ 0.4Mpa. | 3) The suction pipe should be short and straight, and the pipe diameter should be slightly larger than the pump inlet. 4) suction valve should be fully open. Otherwise, cavitation will occur, resulting in a decrease in capacity and efficiency and serious loss of suction. When the axial piston pump draws in the ball stroke, the plunger will be forcibly pulled out of the cylinder and the ring hinge will be damaged. 2.2 to ensure that the hydraulic pump and motor oil drain pipe flow, generally do not answer the back pressure l) motor drain pipe should be separate back to the tank, not allowed to connect with the return port. 2) The external drain pipe should ensure that the pump and oil motor housing filled with oil to prevent the oil tank back to the tank when parked, such as the drain port is higher than the shell. 3) The general drain port does not take the back pressure, if the need back pressure, the value should not exceed 0.16 ~ 0.20MPa, otherwise the hydraulic pressure will break the low pressure seal, such as the shaft seal. 2.3 should ensure that low speed high torque motor has enough back pressure l) curve type oil motor with particular attention, usually back to the oil back pressure should be 0.3 ~ 1.0MPa, the higher the speed, back to the oil back pressure should be greater, Otherwise, it will cause the roller to separate from the guide rail surface of the stator to cause impact, vibration and noise, which may cause serious damage. 2) The plunger pump, which is also used as an oil motor, should be supplied with enough oil pressure. For example, when the speed limiter is in descending condition, the oil inlet becomes the oil return port of the oil motor. 3 hydraulic pump installed correctly 1) Shaft and motor should be flexible coupling, the axis of coaxial error does not exceed 0.1mm, tilt angle ≤ 10 °. Most of the oil pump and oil motor rotation is not stable, the cover due to the assembly of the coaxial error error, or the shell pressure is too large, or uneven pressing force, so once installed to adjust the installation position, it should be installed Pin or bolt. 2) When connecting the shaft oil pump and the oil motor shaft, the pulley and gear should not be installed to avoid adding extra radial load, otherwise additional support is required. 3) installed in the oil pipeline between the pump and connecting pipe shock isolation hose should prevent the torsion, and leave a certain amount of relaxation. 4 Proper use and maintenance 1) The initial use or overhaul of the pump should be started before the pump filling oil to ensure lubrication. 2) Before starting the steering should be checked, the provisions of the steering pump can not be reversed, and the use of auxiliary mercury fuel supply, the start should be opened after the auxiliary pump to open the main pump, stop the main pump should stop when the parking pump, to ensure Pump oil. 3) Do not close (close the discharge valve) to start. 4) The maximum working pressure shall not be exceeded: (l) Rated pressure (21MPa) on the nameplate of ZB type oil pump and maximum working pressure (28MPa) at FJ. (2) CY-type pump only specifies the rated pressure, in fact, is the maximum pressure. (3) All models of radial hydraulic motor nameplate both rated pressure, also marked the maximum working pressure. (4) The working pressure is determined according to the maximum pressure working system: one continuous working time of the maximum pressure does not exceed 1min, and the maximum working pressure of the maximum pressure within 1h does not exceed 10%, ie 6min. (5) The rated speed shall not exceed: ZB-type pump maximum speed rl = 1500r / min for the use of sub-pump main pump or as an oil motor allows the use of speed; crank-rod radial hydraulic motor speed below 10r / min will produce crawling phenomenon. (6) should not be a long time at zero (Q = O) operation, or because there is no drain lead to run leaking, cooling, sealing deterioration. (7) Disassembly should prevent the mismatch of the various parts to prevent hard hammering and poking (parts hardness and has been allocated with good parts), hydraulic pump parts before the application of volatile detergent cleaning and drying, forbidden Scrub with cotton.

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