The key point of lubrication of the chain is between the chain hub and the chain shaft, which is also the part most prone to wear. It will lengthen the chain. According to the regulations of the chain manufacturer, the chain is not more than 5 years, and the well lubricated chain can work for 15~20 years.

The chain oil used shall meet the following requirements:

1. Characteristics of friction and wear

Rolling friction and sliding friction occur when the chain works. The guide wheel is actually equivalent to a rolling bearing, low speed, medium load; sliding friction occurs between the two ends of the side plate, the connecting block, and the pin, the pin rotates in the pin hole, so the pin determines the service life of the chain.

According to the above friction and wear characteristics, the requirements for lubricants are:

(1) Good adhesion, can firmly adhere to the friction surface, will not be thrown off by the centrifugal force of the chain;

(2) With good lubrication performance and polar pressure resistance, friction and grinding reduction;

(3) Good permeability can penetrate into each friction link of the chain ring to form oil film; due to the small coordination gap between pin and pin hole, ordinary lubricant is difficult to reach the friction surface, so this is the key to chain lubrication technology.

2. Requirements for lubrication in high temperature environment

After the surface of the workpiece is painted, to enter the oven paint, that is to say, the hanging transport chain needs to repeatedly enter the high temperature area, each time into the high temperature area is about a few minutes. This requires that the chain lubricant should meet:

(1) The base oil of the lubricant has a suitable viscosity and a high viscosity index;

(2) Flash point> 270℃, in the high temperature below 230℃, no carbon deposition, not volatile;

(3) Good oxidation stability, lubricant in the high temperature environment and air contact, not to be quickly oxidized to produce oxides.

3. Requirements of high humidity, acid and alkali environment for lubrication

(1) Water resistance and water vapor, and the lubricant is not emulsified and insoluble in water;

(2) resistance to acid and alkali chemical corrosion, especially phosphorus chemical substances;

(3) rust prevention and anticorrosion properties.

4. Requirements for long-term lubrication

Considering the heavy production task of the production line, the time required for equipment maintenance should be minimized, and the lubricant should be long-term effective; or convenient and feasible filling methods should be considered.

5. Types of conventional chain lubricating oil

The chain lubricating oil is divided according to the different sources of raw materials; Mineral oil and synthetic oil, mineral oil products, sticky temperature, high and low temperature, volatile, coke and carbon, and synthetic oil is based on the deficiencies of mineral oil, synthetic lubrication products, comprehensive performance, the performance are much higher than mineral oil products, the working cycle is 5-8 times longer than the mineral oil.

The most commonly used synthetic oils include PAO, polyester, polyether (PAG). They have their own characteristics, PAG class high temperature oil has the characteristics of instantaneous volatilization, namely at a certain temperature (between 200~240℃) will be all evaporation, its volatilization rate under the condition of 160℃ began to increase quickly, so this kind of oil in actual use is often large, but this kind of evaporation characteristics of oil under the condition of 160℃ temperature can reduce the chain carbon accumulation. The lubrication capacity of synthetic hydrocarbon oil is lower than that of PAG, and in addition, the carbon accumulation problem of hydrocarbon oil is also more serious, so there is not much use of hydrocarbon oil lubrication chain in the conditions above 160℃. In the application of mineral oil, the problems of lubrication and carbon deposition will be more serious, so the mineral oil lubrication should not be applied here. Esteroid oil

In conclusion, the correct selection and use of chain oil has a crucial influence on the life of the chain.