The maintenance and upkeep of box-type filters are key to ensuring their filtration efficiency and extending their service life. Targeted measures should be taken based on the different characteristics of air and liquid types. The following are detailed maintenance and care methods
I. Maintenance and Care of Air Box Filters
1. Regular inspection and cleaning
Primary/Medium efficiency box-type filter
Check once every 1 to 3 months to observe the dust accumulation on the surface of the filter material. If the surface of the filter material turns obviously black, accumulates too much dust, or the air pressure of the ventilation system increases significantly, it is necessary to clean or replace it in time.
Compressed air can be used for reverse purging (with pressure controlled at 0.2-0.3MPa to avoid damaging the filter material), or it can be rinsed with clean water (only applicable to washable filter materials, dry after rinsing before installation, and avoid direct sunlight).
Note: The primary filter can generally be cleaned 2 to 3 times, while the medium-efficiency filter is recommended to be replaced directly after cleaning 1 to 2 times to avoid clogging of the filter material and affecting the filtration effect.
High-efficiency box-type filter
Check every 3 to 6 months and monitor the resistance changes through a differential pressure gauge (when the resistance reaches more than twice the initial resistance, it needs to be replaced).
High-efficiency filters are disposable filter materials (such as HEPA filter paper) and cannot be washed. Once clogged or the efficiency drops, they must be replaced as a whole. It is strictly prohibited to disassemble or clean them by oneself to avoid damaging the sealing property of the filter material.
When replacing, please note: Before installing the new filter, clean the filter frame and the surrounding environment to prevent dust from falling in. When installing, ensure that the sealing rubber strips or gaskets are intact to prevent air leakage.
Self-cleaning box-type filter
Regularly inspect the automatic ash cleaning system (pulse valve, Venturi tube, nozzles, etc.) to ensure that the reverse blowing pressure is normal (generally 0.4-0.6MPa), the nozzles are not clogged, and the ash cleaning program runs smoothly.
Check the surface of the filter element every week for any damage or deformation. If any damage to the filter element is found, replace it in time to prevent unfiltered air from directly entering the system.
2. Daily operation and maintenance
Avoid operating the filter under conditions exceeding the designed air volume, temperature (generally -10 ℃ to 60℃), or humidity (for non-moisture-proof filters, avoid long-term use in an environment with a relative humidity greater than 80%), to prevent the filter material from aging or deforming.
Before starting the ventilation system, clear the debris and dust around the air inlet first to reduce the load on the filter.
Regularly check whether the connection between the outer frame of the filter and the air duct is sealed. If any gap is found, it should be treated with sealant or gasket to prevent the unfiltered air from short-circuiting.
Ii. Maintenance and Care of Liquid Box Filters
Maintenance of filter plates and filter cloths
After each use:
Clean the filter cake in the filter chamber in a timely manner, rinse the surface of the filter plates and the filter cloth with clean water to remove the remaining materials (especially corrosive or sticky materials, to avoid clogging the filter cloth pores after drying).
Check if the filter cloth is damaged or has holes. If so, repair or replace it in time. If the filter cloth is of a washable type (such as polyester or polypropylene material), it can be regularly soaked and cleaned in a weak alkali or weak acid solution (depending on the characteristics of the material) to remove oil stains or scale.
Regularly inspect the filter plates
Check the sealing surface of the filter plate every 1 to 2 months to see if it is flat, free of cracks or deformations. If the sealing surface is damaged, it may cause leakage and the filter plate needs to be replaced. At the same time, check whether the feed holes and liquid outlet holes of the filter plate are blocked. You can use special tools to clear them.
2. Maintenance of equipment components
Hydraulic system
Check the oil level and quality of the hydraulic oil every week. When the oil level is lower than the mark line, replenish the same type of hydraulic oil in time. If the oil is turbid or contains impurities, the oil needs to be replaced and the oil tank cleaned.
Regularly check whether the hydraulic pipelines and joints are leaking and whether the cylinder operates smoothly. If any problems are found, repair or replace the sealing parts in time.
Other components
Lubricating oil should be added to the moving parts of the equipment such as bearings and guide rails once a month to ensure smooth operation.
Check whether the control panel and sensors (such as pressure sensors) are working properly, and calibrate them regularly to ensure that the equipment operates according to the set program.
3. Shutdown and long-term storage
Short-term shutdown (within one week) : The materials in the filter chamber need to be thoroughly cleaned, the filter plates and filter cloths should be rinsed, and the equipment should be kept dry.
Long-term storage (more than 1 month)
Thoroughly clean all components of the equipment. The filter cloth should be dried and stored separately to prevent moisture and mold.
The hydraulic system needs to release pressure, drain all the hydraulic oil, clean the oil tank and apply anti-rust oil. Apply anti-rust agent to the surface of the filter plates and metal parts to prevent rusting.
The equipment should be stored in a well-ventilated and dry environment, avoiding direct sunlight and rain.
Iii. General Maintenance Principles
Record maintenance logs: Each time a component is inspected, cleaned, or replaced, record the time, operation content, and equipment status (such as resistance, pressure, filter material wear, etc.) to facilitate traceability and the formulation of subsequent maintenance plans.
Use compliant accessories: When replacing filter materials, filter cloths, seals, etc., choose original factory or specification accessories to avoid reduced filtration efficiency or equipment damage due to size mismatch or material incompatibility.
Safe operation: Before maintenance, the power supply or power source of the equipment must be turned off to ensure that the equipment is in a shutdown state. When handling corrosive liquids or high-temperature media, protective equipment such as protective gloves and goggles must be worn.
Through scientific maintenance and care, box-type filters can maintain stable filtration performance, reduce failure rates, extend service life, and thereby lower equipment replacement costs and production interruption risks.
I. Maintenance and Care of Air Box Filters
1. Regular inspection and cleaning
Primary/Medium efficiency box-type filter
Check once every 1 to 3 months to observe the dust accumulation on the surface of the filter material. If the surface of the filter material turns obviously black, accumulates too much dust, or the air pressure of the ventilation system increases significantly, it is necessary to clean or replace it in time.
Compressed air can be used for reverse purging (with pressure controlled at 0.2-0.3MPa to avoid damaging the filter material), or it can be rinsed with clean water (only applicable to washable filter materials, dry after rinsing before installation, and avoid direct sunlight).
Note: The primary filter can generally be cleaned 2 to 3 times, while the medium-efficiency filter is recommended to be replaced directly after cleaning 1 to 2 times to avoid clogging of the filter material and affecting the filtration effect.
High-efficiency box-type filter
Check every 3 to 6 months and monitor the resistance changes through a differential pressure gauge (when the resistance reaches more than twice the initial resistance, it needs to be replaced).
High-efficiency filters are disposable filter materials (such as HEPA filter paper) and cannot be washed. Once clogged or the efficiency drops, they must be replaced as a whole. It is strictly prohibited to disassemble or clean them by oneself to avoid damaging the sealing property of the filter material.
When replacing, please note: Before installing the new filter, clean the filter frame and the surrounding environment to prevent dust from falling in. When installing, ensure that the sealing rubber strips or gaskets are intact to prevent air leakage.
Self-cleaning box-type filter
Regularly inspect the automatic ash cleaning system (pulse valve, Venturi tube, nozzles, etc.) to ensure that the reverse blowing pressure is normal (generally 0.4-0.6MPa), the nozzles are not clogged, and the ash cleaning program runs smoothly.
Check the surface of the filter element every week for any damage or deformation. If any damage to the filter element is found, replace it in time to prevent unfiltered air from directly entering the system.
2. Daily operation and maintenance
Avoid operating the filter under conditions exceeding the designed air volume, temperature (generally -10 ℃ to 60℃), or humidity (for non-moisture-proof filters, avoid long-term use in an environment with a relative humidity greater than 80%), to prevent the filter material from aging or deforming.
Before starting the ventilation system, clear the debris and dust around the air inlet first to reduce the load on the filter.
Regularly check whether the connection between the outer frame of the filter and the air duct is sealed. If any gap is found, it should be treated with sealant or gasket to prevent the unfiltered air from short-circuiting.
Ii. Maintenance and Care of Liquid Box Filters
Maintenance of filter plates and filter cloths
After each use:
Clean the filter cake in the filter chamber in a timely manner, rinse the surface of the filter plates and the filter cloth with clean water to remove the remaining materials (especially corrosive or sticky materials, to avoid clogging the filter cloth pores after drying).
Check if the filter cloth is damaged or has holes. If so, repair or replace it in time. If the filter cloth is of a washable type (such as polyester or polypropylene material), it can be regularly soaked and cleaned in a weak alkali or weak acid solution (depending on the characteristics of the material) to remove oil stains or scale.
Regularly inspect the filter plates
Check the sealing surface of the filter plate every 1 to 2 months to see if it is flat, free of cracks or deformations. If the sealing surface is damaged, it may cause leakage and the filter plate needs to be replaced. At the same time, check whether the feed holes and liquid outlet holes of the filter plate are blocked. You can use special tools to clear them.
2. Maintenance of equipment components
Hydraulic system
Check the oil level and quality of the hydraulic oil every week. When the oil level is lower than the mark line, replenish the same type of hydraulic oil in time. If the oil is turbid or contains impurities, the oil needs to be replaced and the oil tank cleaned.
Regularly check whether the hydraulic pipelines and joints are leaking and whether the cylinder operates smoothly. If any problems are found, repair or replace the sealing parts in time.
Other components
Lubricating oil should be added to the moving parts of the equipment such as bearings and guide rails once a month to ensure smooth operation.
Check whether the control panel and sensors (such as pressure sensors) are working properly, and calibrate them regularly to ensure that the equipment operates according to the set program.
3. Shutdown and long-term storage
Short-term shutdown (within one week) : The materials in the filter chamber need to be thoroughly cleaned, the filter plates and filter cloths should be rinsed, and the equipment should be kept dry.
Long-term storage (more than 1 month)
Thoroughly clean all components of the equipment. The filter cloth should be dried and stored separately to prevent moisture and mold.
The hydraulic system needs to release pressure, drain all the hydraulic oil, clean the oil tank and apply anti-rust oil. Apply anti-rust agent to the surface of the filter plates and metal parts to prevent rusting.
The equipment should be stored in a well-ventilated and dry environment, avoiding direct sunlight and rain.
Iii. General Maintenance Principles
Record maintenance logs: Each time a component is inspected, cleaned, or replaced, record the time, operation content, and equipment status (such as resistance, pressure, filter material wear, etc.) to facilitate traceability and the formulation of subsequent maintenance plans.
Use compliant accessories: When replacing filter materials, filter cloths, seals, etc., choose original factory or specification accessories to avoid reduced filtration efficiency or equipment damage due to size mismatch or material incompatibility.
Safe operation: Before maintenance, the power supply or power source of the equipment must be turned off to ensure that the equipment is in a shutdown state. When handling corrosive liquids or high-temperature media, protective equipment such as protective gloves and goggles must be worn.
Through scientific maintenance and care, box-type filters can maintain stable filtration performance, reduce failure rates, extend service life, and thereby lower equipment replacement costs and production interruption risks.
