The lubrication system of a stretch film slitting and rewinding machine is a core component ensuring efficient and stable operation. Its design requires precise matching to the frictional characteristics of key components such as slitting, rewinding, and transmission. This system forms a lubrication network covering the entire machine by rationally selecting lubrication methods, lubricant types, and oil supply strategies, ensuring that all components maintain a low-friction, low-wear state during high-speed operation. For example, the slitting blade assembly, as a core component, requires a high-precision drip oil device for lubrication of its blade shaft and bearings. Through controllable oil supply, a continuous oil film is formed during high-speed blade rotation, preventing increased wear or abnormal temperature rise caused by direct metal-to-metal contact. This localized lubrication design not only meets the stringent cleanliness requirements of the slitting process and prevents lubricating oil from contaminating the film material, but also reduces blade vibration and improves the smoothness of the slitting edges through the buffering effect of the oil film.
The rewinding and unwinding mechanisms of the rewinder involve the rotational motion of large-diameter rollers. The focus of lubrication in this area is to reduce impact friction during the start-up and braking phases. These components typically employ centralized lubrication systems, using pump stations to deliver lubricating oil to various lubrication points, with distributors providing synchronized oil supply at multiple points. For example, the support bearing of the winding shaft needs to withstand combined axial and radial loads during rewinding. A centralized lubrication system can inject lubricating oil containing anti-wear additives at regular intervals and in measured quantities, forming an elastic hydrodynamic oil film between the bearing raceway and rolling elements. This converts sliding friction into liquid friction, significantly reducing the coefficient of friction. Simultaneously, the lubricating oil, during circulation, can also carry away the heat generated by friction, preventing the bearing from overheating and causing grease deterioration or metal expansion leading to seizure, thus ensuring tension stability during the rewinding process.
Lubrication of transmission components must consider both friction reduction and noise reduction. The gearbox, chain, and belt drive systems of stretch film slitting and rewinding machines generate periodic impact loads during operation. Insufficient lubrication can easily lead to pitting on the tooth surfaces or chain elongation. For such components, a combination of oil immersion and splash lubrication is typically used: an appropriate amount of lubricating oil is injected into the gearbox, and the rotation of the gears splashes the oil onto the tooth surfaces and bearings, creating dynamic lubrication; for chain drives, a scraper plate located next to the sprocket evenly coats the chain links with lubricating oil from the tank, reducing wear between the chain plates and pins. In addition, some high-end models add a solid lubricant coating, such as molybdenum disulfide or polytetrafluoroethylene, to the transmission system to form a supplementary lubrication layer in high-temperature or high-speed areas that lubricating oil cannot cover, further extending the service life of components.
Maintenance and management of the lubrication system are crucial for its long-term operation. During daily operation, the oil level, oil quality, and oil supply line condition should be checked regularly to prevent lubrication failure due to oil leakage or contamination. For example, the oil drip device of the slitting blade assembly needs to be cleaned weekly to prevent clogging that affects oil supply accuracy; the filter of the centralized lubrication system needs to be replaced monthly to ensure that the oil cleanliness meets standards. For scenarios using food-grade lubricants, relevant certification requirements must be strictly followed to prevent industrial-grade lubricants from contaminating the membrane material. In addition, the lubrication system should be kept under low load during equipment shutdown to prevent component corrosion through circulating oil and ensure lubrication for the next startup.
Environmental adaptability is also an important consideration in lubrication system design. In high-temperature or humid environments, lubricating oil is prone to oxidation and deterioration or emulsification due to water absorption, leading to decreased lubrication performance. In such cases, synthetic lubricating oil or special oil with added rust inhibitors should be used, and cooling devices or drying modules should be added to maintain stable oil temperature. For example, the lubrication system of stretch film slitting and rewinding machines used in coastal areas needs to be equipped with dehumidification functions to prevent salt spray corrosion of oil supply lines or lubrication points, ensuring reliable operation of the equipment under harsh conditions.
From a system integration perspective, the lubrication systems of modern stretch film slitting and rewinding machines are developing towards intelligence. By installing pressure sensors and flow meters in the lubrication lines, the working status of each lubrication point can be monitored in real time, and automatic alarms and shutdown protection can be implemented when oil supply is abnormal. Some models also incorporate condition monitoring technology, which analyzes changes in the metal particle content or viscosity of the lubricating oil to predict component wear trends in advance, providing data support for preventative maintenance. This intelligent upgrade not only improves the reliability of the lubrication system but also reduces the risk of unplanned downtime due to lubrication failures.
The lubrication system of the stretch film slitting and rewinding machine achieves precise lubrication of core components such as slitting, rewinding, and transmission through multi-dimensional technological collaboration. From the selection of lubrication methods to the matching of lubricants, from routine maintenance to intelligent monitoring, every aspect revolves around the three major goals of "reducing friction, controlling temperature, and preventing contamination," providing a solid guarantee for the efficient operation of the equipment and the high-quality slitting of the film material.
