1、 Equipment preparation and inspection

1. Component integrity check
   • Confirm that core components such as motors, reducers, feeders, cutters, and screens are not loose, damaged, or stuck with foreign objects. For example, clogged screens can cause uneven particle distribution and require regular cleaning or replacement.
   • Check the electrical system to ensure that the wires are not exposed and the grounding is reliable, avoiding the risk of leakage or short circuit.
2. Cleaning and Debugging
   • Remove internal residues from the equipment to prevent cross contamination of materials from different batches. For example, if the previous batch of chemicals remains in powder modification, it may affect the purity of the product.
   • Adjust parameters such as speed, temperature, pressure, etc. according to process requirements. For example, plastic granulation requires controlling the moisture content of the raw materials to be ≤ 0.5%, otherwise it is easy to cause particle adhesion or breakage.
3. Raw material preparation
   • Select raw materials that meet the requirements to ensure that the particle size, humidity, and purity meet the standards. For example, coarse raw material particles in powder modification may lead to uneven coating.
   • When mixing multiple raw materials, it is necessary to ensure uniformity and avoid component segregation.

2、 Parameter Control and Operating Standards

1. temperature management
   • Preheat the equipment to the required temperature for the process (such as preheating to a specific temperature for PE granulation) to avoid excessive temperature fluctuations that may affect product quality. For example, a low temperature may lead to poor material fluidity, while a high temperature may trigger decomposition.
   • Closely monitor the temperature during operation to ensure it is within a reasonable range. If the temperature is abnormal (such as insufficient heating or poor cooling), the machine should be stopped immediately to check the heating coil wiring or cooling pipeline.
2. Speed and pressure regulation
   • Maintain stable rotational speed to avoid uneven particle size caused by excessive fluctuations. For example, the cutter speed error needs to be controlled within ± 5r/min.
   • Regularly check the pressure to prevent damage to the equipment caused by excessive or insufficient pressure. For example, when the melt pressure exceeds 80% of the rated value, parameters need to be adjusted or the machine needs to be shut down for maintenance.
3. Coordination of feeding and supply
   • Evenly feed materials to avoid shortage or excess. For example, uneven feeding can cause fluctuations in host load and affect particle quality.
   • The feeding speed should match the processing capacity of the equipment to prevent material accumulation or blockage.

3、 Safety protection measures

1. Personal protective equipment
   • Operators must wear protective goggles, masks, gloves, anti-static work clothes, etc. to prevent material splashing or dust inhalation. For example, inhaling dust during powder modification may cause respiratory diseases.
   • It is strictly prohibited to bring sparks or non explosion proof electronic devices into the operating area to prevent combustion or explosion accidents.
2. Equipment safety protection
   • Ensure that protective covers, guardrails, and other devices are in good condition to prevent personnel from coming into contact with rotating parts. For example, when cleaning rotating parts such as tires and cylinders, the machine must be stopped for operation.
   • Regularly check whether the emergency stop device (such as the emergency stop button) is sensitive and reliable.
3. Environmental safety control
   • Maintain good ventilation in the operating area to prevent dust accumulation. For example, using a dust collector to regularly clean accumulated dust to avoid reaching explosive concentrations.
   • Keep the floor and walls moist to reduce static electricity generation; Flammable materials are prohibited from being piled up in the workshop.

4、 Operation monitoring and exception handling

1. Real time monitoring parameters
   • Record key parameters such as temperature, pressure, and current every hour to ensure stability within the process range. For example, when the motor current exceeds 90% of the rated value, load reduction operation is required.
   • Listen for abnormal equipment noise (such as abnormal gear meshing, bearing noise), check for pipeline leaks or loose fasteners.
2. Abnormal situation handling
   • If any abnormal equipment is found (such as sudden temperature rise or increased noise), it should be immediately shut down for maintenance, the cause should be identified, and reported. For example, when the bearing becomes hot and burns your hands, you need to stop the machine and add butter or replace the bearing.
   • When handling faults, it is necessary to cut off the power, hang a sign, and hang a warning sign stating "Do not close" to prevent accidents caused by misoperation.

5、 Maintenance and upkeep

1. routine maintenance
   • Before starting each shift, check whether the fasteners (such as screw flanges, cutter bolts) are loose and whether the lubrication points have sufficient grease. For example, the bearing chamber needs to be filled with butter every 5-6 days.
   • Clean the hopper and conveying pipeline after work to prevent material residue from clumping.
2. Regular maintenance
   • Check the insulation resistance of the electrical system every month (≥ 2M Ω) and calibrate the temperature control instrument (error ≤± 2 ℃); Clean the carbon deposits on the heating coil and replace the hydraulic oil filter element.
   • Disassemble the barrel and screw every year, check the wear of the lining (replace if the wear is greater than 0.2mm), repair or replace deformed cutters and molds.
3. Spare Parts Management
   • Establish a list of vulnerable parts (such as cutters, molds, bearings, seals), maintain inventory of critical spare parts (such as spare cutters ≥ 2 sets), and regularly conduct inventory updates.