Archive for February, 2017

Note the use of hydraulic pump 11

Although the structure of the hydraulic pump is very different, there are a lot of common points in the installation and use.
(1) Hydraulic pump connection precautions
① hydraulic pump can be installed with bearings or flanges, pumps and prime mover should use a common base bearing, flange and foundation should have sufficient rigidity. Special attention: flow is greater than (or equal to) 160L / min of the piston pump, should not be installed on the tank.
② hydraulic pump and the prime mover output shaft should be used between the elastic coupling connection, is strictly prohibited in the hydraulic pump shaft installed pulley or gear drive hydraulic pump, if must use pulleys or gears and pump connection, you should add a pair of support Seat to install pulley or gear, the bearings and pump shaft coaxiality error should not be greater than Φ0.05mm.
③ Suction pipe should be as short as possible. Straight,Straightening Machines big and thick, the oil suction pipeline generally need to set the nominal flow not less than the pump flow 2 times coarse filter (filtration precision is generally 80 ~ 180μm). The drain pipe of the hydraulic pump should be connected directly to the tank, and the back pressure of oil return should not be more than 0.05MPa. Oil pump suction pipe mouth, oil return pipe mouth are required in the tank below the minimum oil surface 200mm. Pay special attention to the oil pump in the piston pump is not allowed to install the oil filter, suction pipe on the cut-off valve diameter should be larger than the oil pipe diameter block, oil pipe length L <2500mm, pipe elbow no more than two.
④ hydraulic pump inlet and outlet should be installed busbar shearing machine firmly, sealing device to be reliable, otherwise there will be inhalation of air or oil leakage, the impact of hydraulic pump performance.
⑤ hydraulic pump self-priming height of not more than 500mm (or import vacuum does not exceed 0.03MPa), if the use of charge pump oil, oil pressure should not exceed 0.5MPa, when the oil pressure exceeds 0.5MPa, to use pressure seal ring. For the plunger pump, should try to use the self-priming method.
⑥ hydraulic pump installed before the installation hole should check whether the depth of the shaft is greater than the length of the pump to prevent the phenomenon of top axis, or will burn the pump.

hydraulic pump

hydraulic pump

(2) the use of hydraulic pump Note
① start the hydraulic pump should be the first point several times, the oil flow direction and sound are normal, the low-pressure operation 5 ~ 10min, and then put into normal operation. Before starting the plunger pump, the pump must be filled with clean working oil through the drain port on the housing.
(2) the viscosity of the oil affected by temperature changes, the oil temperature increased viscosity decreases, so the oil temperature required to remain below 60 ℃, in order to make the hydraulic pump at different working temperatures to stabilize the work, the selected oil should have Viscosity of the temperature change by the oil temperature characteristics of smaller, and better chemical stability, anti-foam properties cnc drilling. Recommended L-HM32 or L-HM46 (GB11118.1-94) anti-wear hydraulic oil.
③ oil must be clean, not mixed with mechanical impurities and corrosive substances, oil suction line without filter device hydraulic system, must be filtered by oil vehicles (filtration accuracy of less than 25μm) to fuel tank.
④ The maximum pressure and the maximum speed of the hydraulic pump, is in the use of a short period of time to allow the peak should be avoided long-term use angle shearing, otherwise it will affect the life of the pump.
⑤ The normal working temperature of the hydraulic pump is 15 ~ 65 ℃, the maximum temperature on the pump casing is 10 ~ 20 ℃ higher than the oil temperature at the pump inlet. When the oil temperature reaches 65 ℃, the highest The temperature does not exceed 75 ~ 85 ℃.