The boundary lubrication is realized by the boundary oil film. The boundary oil film is a very thin adsorption oil layer with a certain thickness and strength. The thickness of the oil film is related to the load between the gears, the moving speed and the properties of the lubricating oil. The boundary oil film relies on the attraction of the lubricating oil molecules and the metal molecules on the tooth surface to make the lubricating oil adhere to the metal surface firmly, and form a thin oil film. The lubricating oil with better oil quality forms a thicker boundary oil film, and the oil film is thinner. The flowing oil film does not adsorb the metal surface, it can flow freely, and the relative movement between the tooth surfaces generates dynamic oil pressure to withstand a certain load. This lubrication belongs to elastic fluid lubrication. When the friction surfaces move relative to each other, the oil molecules forming the oil film slide relative to each other, thereby reducing friction, reducing wear, and achieving lubrication.
Test Table 1 HL-20 oil quality index, the test lubricants are shown in Table 1: HL-20 gear oil is a pressure-resistant gear oil, this oil has no extreme pressure additive, this oil has a slightly better resistance Grinding performance, but the oxidation stability is poor, the viscosity changes quickly after use, and the service life is short.
18# hyperbolic gear oil is added with a large number of anti-wear, anti-corrosion, anti-corrosion and anti-rust extreme pressure additives, which has low friction coefficient, good adsorption and wedging ability, certain cohesion, high purity and resistance. Good oxidation stability, no grinding and corrosive, good thermal conductivity and large heat capacity. The main components of 18# hyperbolic gear oil are shown in Table 2.
Table 2: Main components of double-curve gear oil in Table 2.2.2. Test procedure Load test of shearer gear of shearer, first reverse rotation, from no load to 150KW, then forward rotation, add by no load To 150 kW, the oil temperature was measured continuously for 6 hours.
Test results and analysis test results: Lubricated gluing was performed with HL-20 gear oil to lubricate the tooth surface; the gear tooth surface was lubricated with 18# hyperbolic gear oil, without scratching and gluing.
When the rocker arm gear is engaged, the force per leg is 37kg. Because the joint is stressed, and there is rolling and sliding, a large amount of heat is generated. As time increases and the load increases, the temperature rise gradually increases. Finally, When the oil temperature reaches 128 °C, the viscosity of the lubricating oil decreases with the increase of temperature under the high temperature and high pressure of HL-20 gear oil. The adsorption of the polar molecules and the metal surface of the oil is getting worse and worse, making the thickness of the oil film more and more Thin, and finally lead to oil film damage, lubrication of the effect, forming dry friction between the two tooth surfaces, so the gear is scratched and glued. 18# hyperbolic gear oil contains sulfur and phosphorus components and extreme pressure additives. Therefore, it has anti-wear, anti-oxidation and anti-corrosion properties. When the gear transmission chemical reaction film is at high temperature and heavy load, the sulfur and phosphorus are released to release active elements. The element reacts with the metal to form a chemically reactive film with high plasticity and low melting point. The chemical reaction film is firmly adsorbed on the metal surface. It is a smooth surface layer that floats over the metal surface to separate the two teeth. Face, keep the oil film, make the tooth surface form a fluid lubrication, and avoid gear gluing.
Lubricating oil selection When the gear is subjected to a large pressure, oil oil with extreme pressure additives with good oil resistance and extreme pressure resistance should be selected. At low speed, high viscosity and oily lubricating oil should be used to take advantage of the formation of oil film. Achieve good lubrication; at the same time, when the working environment temperature is very high, the viscosity should be larger, the flash point is higher (to avoid rapid evaporation or spontaneous combustion of the lubricating oil), the oil is good and anti-oxidation and anti-rust additives are added to the gear oil.
Conclusion The test proves that under the premise of ensuring the quality of the gear, a reasonable and correct choice of lubricating oil is the main reason for solving the gear gluing.
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