Analysis of the top ten common faults of filter press
Topic 1: Automatic pressure-preserving filter press, after installation, the indicator light does not light, press the button, no response.
Answer: In this case, first check whether the three-phase power supply and the neutral line are connected correctly, and often the user forgets to connect the zero line. At the same time, check whether the fuse is burnt or not, and whether the circuit breaker in the electrical cabinet is in the closed state.
Topic 2: Automatic pressure-preserving filter press, the indicator light is on, press the button, the motor does not turn.
Answer: First check whether the fuse is burnt. If the fuse is normal, then observe whether the intermediate relay and the AC contactor are working normally. Usually, the intermediate relay is burnt out, or the motor may be burnt.
Topic 3: The newly purchased filter press, the motor is turning correctly, why is the piston not moving?
Answer: It may be that no hydraulic oil is added to the fuel tank. The filter press is empty in the fuel tank at the factory. Users need to add hydraulic oil (grade No. N46-68). If there is no oil idling for a long time, the pump will burn out due to overheating.
Question 4: A user asks for a newly purchased filter press. The motor is turning correctly, the hydraulic oil is full, and it is impossible to advance or retreat.
Answer: It is understood that the model needs to be held down by pressing and releasing the release button. The machine is already in a tight state. The user presses the release button and clicks to release it. The result is that the filter press is not normal.
Topic 5: A user said that his filter press has been working normally before. Now he can't work anymore. I don't know why?
Answer: Send someone to repair and find that the motor steering is reversed. After inquiry, the unit power transformer has just been replaced. When the filter press is used again, the motor steering is not noticed. After the steering is adjusted, the work returns to normal.
Question 6: A chemical unit says that its filter press starts when it is energized, and the motor runs for a short time, and the thermal protection relay operates.
Answer: 1. Check the circuit wiring is normal. After measuring the terminal block with the multimeter, it is found that the terminal has been corroded and short-circuited, but the appearance is not visible. The fault disappears after replacing a new terminal.
2. Thermal protection action, the touch motor feels hot, suspected that the oil circuit is not smooth, resulting in large output resistance of the oil pump. After inspection, it is found that the reversing valve has a suction force on one side of the electromagnet, causing the commutation to be in place, and the electromagnet is replaced and returned to normal.
Topic 7: Filter presses using solenoid-operated directional valves often have a tendency to enter or not retreat after a long period of use.
Answer: 1. The common reason is that the hydraulic oil is not replaced for a long time, and the dirt will be trapped in the reversing valve. At this time, the reversing valve should be disassembled and cleaned. The hydraulic oil should be replaced in time when it is used normally.
2. This phenomenon can also occur when the solenoid valve coil is burned or the appliance is controlled to malfunction.
Topic 8: The oil pump works normally, but the oil pressure is too low or no pressure to answer: 1. There is no oil in the fuel tank. Considering transportation and other issues, the hydraulic oil in the fuel tank is empty when the new machine leaves the factory. How can it be without oil? Is there pressure?
2. The hydraulic oil is not added enough, so that the oil cannot be sucked. The hydraulic oil should be added according to the position indicated by the liquid level gauge.
3. The upper limit of the electric contact pressure gauge is adjusted to a low position, and it is adjusted to a suitable position, and the relief valve is adjusted to achieve a suitable pressure.
4. The relief valve adjusts the pressure low, loosens the relief valve lock nut, rotates the overflow valve handle (inward rotation increases the oil pressure, outward rotation reduces the oil pressure) to adjust the oil pressure, the ordinary pressure gauge model is adjusted to the rated Working pressure, the electric contact pressure gauge model is adjusted to be slightly higher than the rated working pressure.
5. After many years (3 years - 5 years or more) of the filter press, the seal ring installed on the piston inside the cylinder wears, and there is also a phenomenon that the pressure does not go up.
6. If there is oil leakage on the oil road, there will be a phenomenon that the pressure does not go up.
Question 9: When filtering, there is a spray phenomenon between the filter plates.
Answer: 1. It may be caused by too high feed pressure. Many users do not install pressure gauges on the feed line, which causes the feed pressure to be out of control and eventually causes the spray.
2. The top tightening force of the filter plate is not enough. After the feed pressure is increased, the force between the filter plates spreads the filter plate to cause the spray.
3. The sealing surface of the filter plate has filter cake and other impurities attached to the surface. There is always a large gap after the filter plate is pressed, so the sealing surface should be cleaned after the filter cake is removed.
4. The sealing surface of the filter plate has been through the groove or the filter plate itself has been damaged.
Question 10: How to control the feed pressure?
Answer: Install a pressure gauge and valve C between the feed pump outlet and the filter press inlet, and install valve B between the feed pump outlet and the material storage tank. A pressure gauge is used to monitor the feed pressure, a valve C controls the feed rate, and a return valve B controls the feed pressure. Some users think that it is not feasible to control the feed pressure by installing only the valve C. The pressure gauge must also be installed.
Answer: In this case, first check whether the three-phase power supply and the neutral line are connected correctly, and often the user forgets to connect the zero line. At the same time, check whether the fuse is burnt or not, and whether the circuit breaker in the electrical cabinet is in the closed state.
Topic 2: Automatic pressure-preserving filter press, the indicator light is on, press the button, the motor does not turn.
Answer: First check whether the fuse is burnt. If the fuse is normal, then observe whether the intermediate relay and the AC contactor are working normally. Usually, the intermediate relay is burnt out, or the motor may be burnt.
Topic 3: The newly purchased filter press, the motor is turning correctly, why is the piston not moving?
Answer: It may be that no hydraulic oil is added to the fuel tank. The filter press is empty in the fuel tank at the factory. Users need to add hydraulic oil (grade No. N46-68). If there is no oil idling for a long time, the pump will burn out due to overheating.
Question 4: A user asks for a newly purchased filter press. The motor is turning correctly, the hydraulic oil is full, and it is impossible to advance or retreat.
Answer: It is understood that the model needs to be held down by pressing and releasing the release button. The machine is already in a tight state. The user presses the release button and clicks to release it. The result is that the filter press is not normal.
Topic 5: A user said that his filter press has been working normally before. Now he can't work anymore. I don't know why?
Answer: Send someone to repair and find that the motor steering is reversed. After inquiry, the unit power transformer has just been replaced. When the filter press is used again, the motor steering is not noticed. After the steering is adjusted, the work returns to normal.
Question 6: A chemical unit says that its filter press starts when it is energized, and the motor runs for a short time, and the thermal protection relay operates.
Answer: 1. Check the circuit wiring is normal. After measuring the terminal block with the multimeter, it is found that the terminal has been corroded and short-circuited, but the appearance is not visible. The fault disappears after replacing a new terminal.
2. Thermal protection action, the touch motor feels hot, suspected that the oil circuit is not smooth, resulting in large output resistance of the oil pump. After inspection, it is found that the reversing valve has a suction force on one side of the electromagnet, causing the commutation to be in place, and the electromagnet is replaced and returned to normal.
Topic 7: Filter presses using solenoid-operated directional valves often have a tendency to enter or not retreat after a long period of use.
Answer: 1. The common reason is that the hydraulic oil is not replaced for a long time, and the dirt will be trapped in the reversing valve. At this time, the reversing valve should be disassembled and cleaned. The hydraulic oil should be replaced in time when it is used normally.
2. This phenomenon can also occur when the solenoid valve coil is burned or the appliance is controlled to malfunction.
Topic 8: The oil pump works normally, but the oil pressure is too low or no pressure to answer: 1. There is no oil in the fuel tank. Considering transportation and other issues, the hydraulic oil in the fuel tank is empty when the new machine leaves the factory. How can it be without oil? Is there pressure?
2. The hydraulic oil is not added enough, so that the oil cannot be sucked. The hydraulic oil should be added according to the position indicated by the liquid level gauge.
3. The upper limit of the electric contact pressure gauge is adjusted to a low position, and it is adjusted to a suitable position, and the relief valve is adjusted to achieve a suitable pressure.
4. The relief valve adjusts the pressure low, loosens the relief valve lock nut, rotates the overflow valve handle (inward rotation increases the oil pressure, outward rotation reduces the oil pressure) to adjust the oil pressure, the ordinary pressure gauge model is adjusted to the rated Working pressure, the electric contact pressure gauge model is adjusted to be slightly higher than the rated working pressure.
5. After many years (3 years - 5 years or more) of the filter press, the seal ring installed on the piston inside the cylinder wears, and there is also a phenomenon that the pressure does not go up.
6. If there is oil leakage on the oil road, there will be a phenomenon that the pressure does not go up.
Question 9: When filtering, there is a spray phenomenon between the filter plates.
Answer: 1. It may be caused by too high feed pressure. Many users do not install pressure gauges on the feed line, which causes the feed pressure to be out of control and eventually causes the spray.
2. The top tightening force of the filter plate is not enough. After the feed pressure is increased, the force between the filter plates spreads the filter plate to cause the spray.
3. The sealing surface of the filter plate has filter cake and other impurities attached to the surface. There is always a large gap after the filter plate is pressed, so the sealing surface should be cleaned after the filter cake is removed.
4. The sealing surface of the filter plate has been through the groove or the filter plate itself has been damaged.
Question 10: How to control the feed pressure?
Answer: Install a pressure gauge and valve C between the feed pump outlet and the filter press inlet, and install valve B between the feed pump outlet and the material storage tank. A pressure gauge is used to monitor the feed pressure, a valve C controls the feed rate, and a return valve B controls the feed pressure. Some users think that it is not feasible to control the feed pressure by installing only the valve C. The pressure gauge must also be installed.
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