The chain drive is not only suitable for use under high torque and low speed, but also shows superiority in corrosive and wet environments, as well as in high-speed transmission. The smooth running of the chain, the flexibility of the chain link, and the reduction of wear depend on the good lubrication effect of the chain lubrication system. The chain lubrication system needs to inject high temperature-resistant lubricating oil into the gap between the pin shaft and the sleeve of the chain regularly and quantitatively. To ensure good lubrication effect and reduce the consumption of lubricating oil. High temperature chain oil is usually made of synthetic oil such as polyether, polyalphaolefin (PAO) and ester oil as Base Oil, and then with additives such as high temperature anti-oxidation, anti-corrosion, extreme pressure and anti-wear. With the rapid development of my country's textile, printing and dyeing, petrochemical, building materials and transportation industries, the operating temperature of the transmission system of these equipment is getting higher and higher, and the requirements for chain oil are becoming more and more stringent. Different chain lubricants can be selected for different use environments.
Typical application fields of various types of chain oils
Use temperature range ℃
| Type of base oil
| Main areas of use
|
<150℃
| Mineral oil, semi-synthetic oil, diester, polyether
| Transportation, Agriculture, Mining, Food, etc.
|
150～250℃
| Polyether, polyolefin/diester, trimellitate
| Auto paint, bakery, beverages, etc.
|
220～300℃
| Polyol ester, dibasic acid ester
| Textile setting, stretch tenter, building materials, etc.
|
＞600℃
| Graphite and other solid lubricating materials
| Ceramics, cement, brick making, tile making, etc.
|
1. Types of chains There are many types of chains, which can be divided into: transmission chains, conveyor chains, decorative chains, tightening chains and special chains, etc. According to the structure of the chain, it can be divided into roller chain, sleeve chain, plate chain, nylon roller chain, scraper chain, sleeve chain and so on. 2. The structure of the chain We can see from the above chain structures that most chains are composed of chain plates, chain pins, bushings and other components. Other types of chains just make different changes to the chain plate according to different needs. Some are equipped with scrapers on the chain plate, some are equipped with guide bearings on the chain plate, and some are equipped with rollers on the chain plate, etc. These are all modifications made to apply in different applications. 3. The main lubricating parts of the chain For general chains, the lubricated parts are mainly sprockets and chain rollers, sprockets and bushings. Due to the different structure of the chain, the lubrication point of the chain may also change. But in most chains, the lubricating parts are mainly sprockets and chain rollers, sprockets and bushings.
4: The main failure form of the chain
A: The pin is broken B: Pitch Growth C: Broken sprocket teeth D: Chain snap 5. Chain drive requirements for lubricants A: Has excellent permeability For chains, it is easier to lubricate the rollers and sprockets, but it is more difficult to lubricate the sprockets and bushings. Because the clearance between the shaft and the bushing is very small and it is completely open ambient conditions. If the lubricating oil does not have good permeability, it cannot penetrate into the inside of the shaft and the sleeve, and it cannot lubricate the shaft and the sleeve.
B: To have excellent adhesion When the chain is running, due to the action of high speed, the lubricating oil will be thrown off. At low speeds, the lubricating oil drips due to gravity. All these not only pollute the environment and products, but also cause a lot of waste. Therefore, the lubricating oil is required to have good adhesion, which can firmly adhere to the friction surface without falling off due to various effects.
C: Has excellent lubricating properties One of the functions of lubricating oil is to lubricate, but when the chain is subjected to different effects during operation, the lubricating performance of the lubricating oil will be higher, especially those chains under heavy load and impact conditions, which have great impact on extreme pressure and anti-wear properties. The requirements are higher, so the general chain lubricants pay great attention to this requirement.
D: has excellent oxidation stability
Usually chain drives work in exposed environments, so chain lubricating oil
E: has a very small evaporation loss rate
F: has a good ability to resist external effects
G: Has the characteristics of different contamination
H: has the least tendency to deposit carbon
The above are the basic requirements of chain transmission for lubricants. Of course, there are many other requirements. These requirements will be different depending on the scope of use of the transmission chain, the environment, and the equipment requirements. 6. Selection of chain lubricant Selection principle of chain lubricant: lubricating oil should be selected as much as possible, and grease and dry film lubricant can be selected for special chains and special circumstances. The requirements for lubricants when the chain is running should be met to the greatest extent, and the most suitable and economical lubricants should be selected in combination with the requirements of equipment and production. The main factors to consider when choosing a chain lubricant are: A: Type of chain B: The application environment of the chain C: The working environment of the chain D: The working condition of the chain E: Lubrication method of the chain F: Other requirements 7. Lubrication form of chain The lubrication form of the chain will vary depending on the way the chain is used. Most chain drives use drip lubrication and oil bath lubrication, and there are also oil spray lubrication and oil rope lubrication. Drip lubrication is generally used for fast, long-distance conveyor chains. For example, chains of baking equipment, chains of textile equipment, etc. The characteristics of this lubrication method are: good lubrication effect, less waste, and no restrictions, but poor lubrication uniformity. Most of the high-speed transmission chains use oil injection lubrication. The characteristics of this lubrication method are: good lubrication effect, good uniformity, and certain limitations, but the waste is large. Oil bath lubrication is generally used for closed chain drives. Such as: drilling equipment in oil fields, etc. The characteristics of this lubrication method are: it should be said to be the most ideal lubrication method, but it is subject to many restrictions. There are other methods of lubrication, especially those with very short chains, which are almost always applied manually: arguably one of the least ideal. 8. Types and characteristics of common chain lubricants on the market At present, there are many kinds of chain lubricants on the market, but the composition of their components is as follows: A: Mineral oil-based chain lubricants without solid lubricants B: Mineral oil-based chain lubricants with solid lubricants C: Synthetic-based chain lubricants without solid lubricants D: Synthetic-based chain lubricants with solid lubricants E: Aerosol type chain lubricant F: Chain Grease
