Introduction to Chain Lubrication: A chain is a flexible transmission component that transmits motion and power through the meshing and detachment of its links and sprocket teeth. There are many kinds of chains, but the most commonly used is sleeve roller chain. The sleeve roller chain has two rotating friction pairs, one is the sleeve and the pin, the other is the sleeve and the roller. The difficulty of chain lubrication is due to the small fitting clearance, which makes it difficult for lubricants to enter.
The lubrication key point of the chain is between the hub and shaft, which is also the most prone area to wear and tear, which can cause the chain to elongate; According to the regulations of the chain manufacturer, when the removal length of the chain link exceeds 5% of the total length, the chain is scrapped; A chain without proper lubrication has a lifespan of no more than 5 years, and a well lubricated chain can work for 15-20 years. Analysis of Chain Lubrication Requirements Chain lubrication points: 
The chain oil used here should meet the following requirements:
1. Friction and wear characteristics: When the chain works, rolling friction and sliding friction occur. The guide wheel is actually equivalent to a rolling bearing, with low speed and medium load; At the connection part of each chain link, sliding friction occurs between the two ends of the side plate, the connecting block and the pin. When the chain turns, the pin rotates in the pin hole, causing severe friction, so the pin determines the service life of the chain; The requirements for lubricants based on the above friction and wear characteristics are: 1.1) Good adhesion, able to firmly adhere to the friction surface without being shaken off by the centrifugal force of the chain 1.2) Having good lubrication performance and extreme pressure resistance, reducing friction and wear; 1.3) Good permeability, able to penetrate into various friction links of the chain link, forming an oil film; Due to the small fit gap between the pin and the pin hole, it is difficult for ordinary lubricants to reach the friction surface. Therefore, this is the key to chain lubrication technology. 2. Requirements for lubrication in high-temperature environments: After the surface of the workpiece is painted, it needs to enter the oven for baking, which means that the hanging conveyor chain needs to repeatedly enter the high temperature zone, and each time it enters the high temperature zone, it takes about dozens of minutes. This requires that the lubricant used for the chain should meet the following requirements: 2.1) The Base Oil of lubricants has a suitable viscosity and a high viscosity index; 2.2) Flash point>270 ℃, below 230 ℃ at high temperatures, without carbon deposition and less volatile; 2.3) Good oxidation stability. Lubricants come into contact with air in high temperature environments and do not quickly oxidize to form oxides. 3. Requirements for lubrication in high humidity and acid-base environments: 3.1) Resistant to water and moisture, lubricants do not emulsify or dissolve in water; 3.2) Resistant to acid and alkali chemical corrosion, especially the reaction of phosphorus chemicals; 3.3) Rust prevention and anti-corrosion performance,; 4. Requirements for long-term lubrication: Considering the heavy production tasks on the production line, the time required for equipment maintenance should be minimized as much as possible, and lubricants should have long-term effectiveness; Alternatively, consider convenient and feasible filling methods.
