Before operation, place the perforated filter paper, carefully between each filter plate and frame, usually 1-2 sheets per layer, depending on the filtration requirements and the quality of the filter paper. When placing the filter paper, avoid misalignment to prevent leakage and affect the filtration effect.
The filter paper should be dried before use, with a drying temperature of around 120°C.
When using used filter paper, it must be dried and free of any damage. Note that the side with filter residue (i.e., the dirty side) should face the filter frame, not the filter plate, to prevent the residue from being washed off during filtration and contaminating the filtered oil.
When the filtration pressure is high and the filter paper shows signs of breaking, you can line the side against the filter plate with filter cloth to increase the strength of the filter.
After placing the filter paper, turn the handwheel to press the filter plates tightly. Only one person is allowed to press the plates, and the pressing handle must not be extended to avoid damaging the machine.
Close the sampling nozzle. If the user has a valve on the oil discharge pipe, open the valve. Connect the motor power supply to start the oil filter machine. The normal working pressure of the oil filter machine varies with the viscosity of the oil and the resistance of the discharge pipe, generally in the range of 0.05-0.3MPa. The initial filtration pressure is low, and as filtration time increases, the pressure gradually rises due to the accumulation of filter residue and moisture absorbed by the filter paper. When it reaches a certain level (depending on the user's requirements for the oil), the filter paper should be replaced.
During the oil filtration process, when extracting oil samples, you can unscrew the oil nozzle to take samples.
When stopping the machine, first open the air inlet valve, and after the oil outlet pipe has no oil, stop the machine, close the inlet and outlet oil valves, stop the oil pump, loosen the pressing device, remove the filter paper piece by piece, clean the filter residue in the filter paper and frames, replace with new filter paper, re-clamp and press tightly, and cover the oil tank. Finally, clean the coarse filter, re-cover and tighten the bolts after cleaning, and set aside for next use.
Plate and frame oil filter maintenance and safety techniques
1. Keep the machine clean at all times.
2. The filter plates and frames are relatively fragile; handle them with care.
3. When pushing the oil filter machine, do not move too fast to avoid severe impact that could damage the equipment.
4. Regularly add lubricating oil to the pressing screw and nut.
5. When using the oil filter machine, ground the motor casing to prevent accidents due to poor motor insulation.
6. Regularly check the connecting bolts of the motor brackets to prevent loosening.
7. If insufficient oil filtration is found, check the following five aspects:
(1) Check for air leaks in the suction pipe, coarse filter, oil inlet valve, and joints.
(2) Check if the suction pipeline is too long (generally not exceeding 5 meters) or the pipe diameter does not meet specifications.
(3) Check if the oil inlet pipe and coarse filter screen are blocked.
(4) Check if any other accessories are installed in the suction pipe section, causing excessive resistance.
(5) Check if the gear pump and safety valve are loose or not tight.
