1、 Daily inspection and basic maintenance

1. Pre-start inspection
   • Power supply and wiringCheck whether the wiring of the motor and control cabinet is loose, whether the cable sheath is damaged, and avoid leakage or short circuit.
   • Transmission componentsConfirm whether the tension of the belt and chain is appropriate (too loose can cause slipping, too tight can increase wear), and whether the coupling bolts are tightened.
   • Wind volume and pressureAfter starting the fan, observe whether the opening of the air door is reasonable to ensure that the air volume can meet the cleaning requirements (such as separating grains and impurities).
   • Screen stateCheck whether the screen mesh and sieve plate are flat, without damage or blockage, and whether the spring of the vibrating screen is elastic and normal.
2. Monitoring during operation
   • abnormal soundListen to whether there are any abnormal noises during the operation of the equipment (such as bearing friction, screen collision), and stop the machine in time for troubleshooting.
   • temperature monitoringTouch the motor and bearing housing with your hands, and the temperature should not exceed 65 ℃ (with the assistance of an infrared thermometer).
   • Discharge qualityRegularly inspect the cleaned materials, confirm whether the impurity separation rate meets the standard, and adjust the air volume or screen angle if necessary.
3. Cleaning after shutdown
   • Residual materialsAfter shutting down the equipment, clean the residual grains or impurities in the feed inlet, screen surface, discharge outlet, and dust collector to prevent mold growth or blockage.
   • Dust collector dischargeIf equipped with a pulse dust collector, it is necessary to regularly discharge the accumulated dust in the ash hopper (usually 1-2 times per shift) to avoid overfilling the ash hopper and affecting the dust removal efficiency.

2、 Regular maintenance plan

1. weekly maintenance
   • Lubrication and maintenanceAdd lubricating grease (such as lithium based grease) to motor bearings, vibrating screen bearings, transmission chains, and other parts to reduce wear.
   • Screen surface fasteningCheck if the fixing bolts of the screen mesh and sieve plate are loose, and tighten them in a timely manner to prevent deformation of the screen surface.
   • Air duct cleaningBlow the fan inlet, air duct, and dust collector filter bag with compressed air to remove attached dust and keep the air duct unobstructed.
2. Monthly maintenance
   • Drive belt adjustmentCheck the wear of the belt. If the crack exceeds 1/3 of the belt width or the elongation exceeds 5%, a new belt needs to be replaced.
   • Vibration screen balanceTest the amplitude and frequency of the vibrating screen. If there is abnormal shaking, adjust the angle of the eccentric block or replace the spring.
   • Electrical system inspectionUse a megohmmeter to measure the insulation resistance of the motor (which should be ≥ 0.5M Ω), and confirm that the contacts of the contactors and relays in the control cabinet are not corroded.
3. Quarterly maintenance
   • Dust collector filter bag replacementIf the resistance of the filter bag exceeds the design value (such as 1200Pa) or is damaged, a new filter bag needs to be replaced to ensure dust removal efficiency.
   • Cleaning of fan impellerDisassemble the fan casing, clean the dust and impurities on the surface of the impeller, and check whether the impeller is balanced (dynamic balance error should be ≤ 5g).
   • Corrosion prevention of structural componentsRust removal treatment should be carried out on metal parts such as equipment casings and brackets, and anti rust paint should be applied to extend their service life.

3、 Special maintenance of key components

1. Screen surface maintenance
   • Screen replacementSelect the appropriate mesh size based on material characteristics such as particle size and humidity, regularly check the wear of the mesh, and replace it in a timely manner if it is perforated or deformed.
   • Screen levelingUse a spirit level to check the levelness of the screen installation, with an error of ≤ 2mm/m, to avoid uneven material distribution caused by tilting.
2. Fan and motor maintenance
   • Fan centeringCheck the alignment between the fan and motor shaft every six months, with a deviation of ≤ 0.1mm to prevent increased vibration.
   • Motor heat dissipationClean the dust on the motor cooling fins, ensure that the ventilation openings are unobstructed, and avoid overheating of the motor.
3. Optimization of dust removal system
   • Pulse valve inspectionTest the injection pressure and frequency of the pulse valve every month. If the injection is weak or leaking, replace the diaphragm or repair the valve body.
   • Ash bucket ash dischargeInstall a level gauge to monitor the dust accumulation in the ash hopper and avoid secondary dust caused by the hopper being too full.

4、 Safe operation and protection

1. Operating Specifications
   • Startup sequenceFirst, turn on the fan and wait for the air volume to stabilize before starting the feeding device; Stop feeding first and then stop the fan when shutting down.
   • protective deviceEnsure that safety protection covers, emergency stop buttons, warning signs, and other safety facilities are in good condition, and prohibit opening maintenance doors during operation.
2. personnel training
   • Provide training to operators on equipment structure, maintenance points, and emergency response to enhance safety awareness and operational skills.
3. Fire and explosion prevention
   • Install explosion-proof motors, explosion-proof switches, and safety devices such as fire extinguishers and dust concentration detectors in environments with high dust concentration.

5、 Seasonal maintenance points

1. Summer maintenance
   • Cooling measuresInstall cooling fans or water cooling devices for motors and fans in high-temperature environments to prevent equipment from overheating.
   • Moisture proof treatmentCheck the sealing of the electrical control cabinet to prevent moisture from entering and causing short circuits.
2. Winter maintenance
   • antifreeze measuresIf the equipment is stopped in a low-temperature environment, the accumulated water in the pipeline and ash hopper should be drained to prevent freezing and damage to the equipment.
   • Preheating startBefore starting in winter, preheat the motor and bearings (such as using a heater) to reduce cold start wear.

6、 Fault prevention and handling