As the core equipment in the plastic recycling chain for achieving deep cleaning and homogenization, the quality of daily maintenance of the plastic recycling washing line directly determines the equipment's operational stability, cleaning efficiency, and service life. Because the washing line is in continuous contact with waste plastics containing oil, mud, and chemicals, and operates under high humidity and high-impact conditions, scientific and standardized daily maintenance is essential to promptly identify and eliminate potential hazards, ensuring that each link is always in optimal working condition.
Pre-shift inspection is the first step in daily maintenance. Before starting the machine, operators should check the water supply pipeline, compressed air, and power supply to ensure they are normal, and confirm that the opening and closing status of each valve and the level gauge reading meet the process requirements; check the lubrication of the transmission components of major equipment such as the friction washer, rinsing tank, and dewatering machine, and replenish or replace lubricating oil (grease) as required; inspect the wear of the blades, screens, and spiral blades, and immediately stop the machine and replace any obviously damaged or loose parts to prevent jamming or uneven material breaking during operation. Meanwhile, debris and accumulated water left over from the previous shift should be cleaned up to keep the equipment and surrounding environment clean and reduce the entry of contaminants into the system.
Monitoring and adjustment during operation are core aspects of maintenance. Regularly check the liquid level, water temperature, and pH value of each tank to ensure that the cleaning water parameters remain stable within the set range, avoiding reduced cleaning efficiency or accelerated equipment corrosion due to water quality fluctuations. Observe the temperature and vibration of motors, gearboxes, and bearings; if abnormal temperature rises or unusual noises are found, promptly investigate the cause and take measures such as reducing load or shutting down for maintenance. Verify the flow rate of the dosing system (such as cleaning agent and flocculant dosing devices) to prevent excessive or insufficient dosage from affecting cleaning and separation effects. For washing lines using closed-loop water circulation, pay attention to the pressure difference between the sedimentation tank and the filter, and initiate backwashing or sludge removal procedures as needed to prevent filter media blockage, which can lead to increased water resistance and reduced cleaning capacity.
Post-shift cleaning and maintenance help prevent contaminants from solidifying and equipment deterioration. After operation, drain the water from the tank and pipes, remove any attached plastic residue, mud, and oil, and pay special attention to rinsing areas prone to dirt accumulation (such as the tank bottom, the back of the screen, and the inside of the baffle plate). Disassemble movable parts (such as filters and scrapers) for soaking and scrubbing to restore their permeability and separation efficiency. Conduct dust and moisture protection checks on the electrical control cabinet, junction box, and sensors, and blow them with dry air if necessary to prevent moisture intrusion that could cause short circuits or false alarms. During long-term shutdown, drain all liquid media, apply rust-preventive oil to metal surfaces, and cover moisture-sensitive parts to prevent corrosion and aging.
Periodic maintenance and spare parts management are an extension of routine care. Develop weekly, monthly, and quarterly inspection plans according to the equipment manual, and systematically test and correct the main shaft dynamic balance, drive belt tension, pump impeller wear, etc.; establish an inventory ledger for vulnerable parts (such as screens, seals, and nozzles) to ensure rapid replacement in case of sudden failures and minimize downtime; record detailed data for each maintenance and repair, and conduct trend analysis to predict the remaining lifespan and replacement timing of key components, gradually shifting from reactive maintenance to preventative maintenance.
Safety and environmental protection requirements must be implemented throughout the entire daily maintenance process. Operators should wear protective gloves, non-slip shoes, and goggles to avoid direct skin contact with chemical cleaning agents and high-speed rotating parts; before cleaning and repairing electrical equipment, strictly follow the procedures of power disconnection, tagging, and voltage verification; wastewater, waste residue, and waste rags should be collected as hazardous waste or general solid waste and disposed of by compliant units to prevent secondary pollution.
In summary, the daily maintenance of a plastic recycling and washing line is a systematic project encompassing pre-shift inspection, operation monitoring, post-shift cleaning, periodic maintenance, and safety and environmental protection. Only by combining standardized operation with meticulous maintenance can we ensure that the equipment can continuously and stably perform its cleaning and sorting functions under harsh operating conditions, improve the quality of recycled plastics, reduce operating costs, and provide a solid equipment guarantee for the sustainable development of the plastic recycling industry.