1、 Daily cleaning and inspection (daily/shift)

1. Cleaning of crushing room
   • Shutdown and power outageAfterwards, open the crushing chamber door and use a soft bristled brush or compressed air to remove residual materials (especially viscous materials such as PVC and TPU) from the blades, screens, and rotors.
   • Check if the screen mesh is blocked or damaged. If the aperture deformation exceeds 10%, it should be replaced immediately to avoid affecting the discharge particle size.
2. Inspection of transmission components
   • Observe the tension of the belt (or coupling). If the belt is loose (sinking by more than 15mm when pressed by hand), adjust the tensioning wheel or replace the belt;
   • Check if the bolts of the bearing seat and motor seat are loose, and tighten them to the specified value (usually 50-80N · m) with a torque wrench.
3. Lubrication maintenance
   • Add lubricating grease to the main shaft bearings, reducers, and other parts (recommended to use lithium based grease NLGI No.2), with 3-5 drops per shift to avoid excessive accumulation of dust.
   • If the equipment is equipped with an automatic lubrication system, check whether the oil level is above the centerline of the scale and whether the oil pipe is blocked.

2、 Monthly deep maintenance

1. Blade maintenance
   • Wear detectionMeasure the thickness of the blade with a vernier caliper. If the remaining thickness is less than 30% of the original size (such as the original 10mm thickness remaining below 3mm), a new blade needs to be replaced;
   • Blade repairFor slightly worn blades, the cutting edge can be manually polished with an oilstone or a grinding machine (maintaining an angle of 15 °~20 °), and after polishing, it needs to be balanced and calibrated to avoid vibration.
2. Screen replacement and cleaning
   • After removing the screen mesh, rinse it with a high-pressure water gun (pressure ≤ 0.5MPa), or soak it in neutral detergent for 2-4 hours before brushing it;
   • When installing a new sieve, ensure that there is no gap between the sieve frame and the sealing surface of the crushing chamber, and tighten them symmetrically with bolts to prevent material leakage.
3. Electrical system inspection
   • Use a megohmmeter to measure the insulation resistance of the motor (≥ 0.5M Ω). If it is lower than the standard, dry or replace the motor;
   • Check whether the wiring terminals are loose or oxidized, polish the oxide layer with sandpaper and tighten it, and apply conductive paste to prevent rust.

3、 Quarterly/Annual Major Maintenance

1. Spindle and rotor calibration
   • After disassembling the spindle, use a dial gauge to detect radial runout (≤ 0.1mm) and axial displacement (≤ 0.05mm). If it exceeds the tolerance, adjust the bearing clearance or replace the bearing;
   • Perform dynamic balance testing on the rotor (balance level G2.5) to ensure smooth operation and reduce vibration and noise.
2. Gearbox maintenance
   • Replace the gearbox gear oil (recommended to use ISO VG220~320 industrial gear oil), replace it after 500 hours of use, and then replace it every 2000 hours thereafter;
   • Check if the oil seal leaks oil. If there is oil leakage, replace the oil seal and clean the oil stains.
3. Anti corrosion treatment of the body
   • Perform rust prevention inspection on metal components (such as crushing chambers and racks), and if the paint layer falls off, polish it and spray anti rust paint (such as epoxy zinc rich primer+acrylic topcoat);
   • Inspect non-metallic components such as belt covers and hoppers for cracks or deformations, and replace damaged parts in a timely manner.

4、 Key precautions

1. safe operation
   • Before maintenance, it is necessary toCut off the power and hang a warning signTo avoid accidental startup;
   • Use specialized tools to disassemble components, and do not directly strike the blade or rotor with a hammer.
2. Material adaptability
   • Avoid crushing materials with hardness exceeding the equipment design value (such as metals with HRC>50) or materials containing sand, gravel, and metal impurities, otherwise it will accelerate blade wear;
   • If different materials need to be crushed, the crushing chamber should be cleaned to prevent cross contamination (such as mixing food grade plastics with industrial plastics).
3. environmental control
   • The equipment should be installed indoors in a dry and ventilated environment with an ambient temperature of ≤ 40 ℃ and humidity of ≤ 80%;
   • If used for crushing heat sensitive materials such as nylon and PC, a cooling system (such as air-cooled or water-cooled) should be equipped to prevent the material from melting and sticking to the knife.