From the perspective of the transmission load, the following characteristics are found: the transmission power is large, the contact pressure of the tooth surface is high, and the impact load is relatively large, especially in the startup phase of the equipment, which is often subjected to excessive overload load; the linear speed of the general gear for the open transmission gear Lower; the working environment temperature changes greatly, and is susceptible to dust, water vapor (such as the working environment in which the cylinder gear transmission of the wet grinding process is located).
For the low-speed, heavy-duty open gear transmission, in terms of tooth geometry design, in order to improve the bending and impact strength of the gear teeth, a large displacement coefficient scheme is generally adopted; in the heat treatment process, the ball mill, the vertical mill, and the large swing In order to improve the hardness and contact strength of the tooth surface, the kiln reducer has adopted the hard tooth surface gear scheme in recent years, and the hardness of the tooth surface is relatively high.
In view of this situation, it is particularly important to improve the lubrication efficiency of cement equipment gears to meet the conditions of use and working environment of cement equipment, to ensure good gear transmission performance and extend the service life of gears.
Therefore, cement 1 equipment workers should pay attention to the following aspects: minimize the tooth surface roughness to increase the oil film thickness of the contact tooth surface, and make the contact tooth surface tend to be elastic fluid lubrication state as much as possible; improve the gear processing and assembly quality. To reduce the excessive contact stress caused by the local contact of the contact tooth surface; after the gear device is assembled, a strict running-in scheme is established according to the load characteristics of the main body of the transmission equipment, and the sulfur and phosphorus type extreme pressure agent are appropriately added to the lubricating oil during the running-in process. Improve the roughness of the tooth surface, improve the lubrication efficiency; reduce the instantaneous temperature of the contact tooth surface, ensure the thickness of the oil film; reasonably select the lubricating oil to enhance the boundary lubrication effect of the lubricating oil.
Generally, compound oil and extreme pressure gear oil are used to improve the ability of lubricating oil to resist fatigue pitting and anti-adhesive bonding. A proper lubrication method and oil supply quantity are used to develop a scientific and reasonable lubrication management system.
The contact tooth surface area is small, the contact stress is quite high, and the original pressure-bonding relationship has failed under high pressure (high contact stress). The elastic fluid dynamic lubrication theory considers the change of the lubricant viscosity with the pressure and the elastic deformation of the lubrication surface.
At this time, the gear pair contact tooth surface is completely separated by the elastic fluid power oil film, the gear pair is in the full film elastic fluid lubrication, the friction of the contact tooth surface will be transformed into the inner friction of the oil film, and the friction coefficient is extremely small, the gear pair The transmission efficiency is the highest.
Moreover, the thickness of the oil film is not affected by the load, and the load is entirely borne by the oil film. The probability of pitting corrosion of the gear and damage of the arsenic group is also complimented by the “collective stateâ€, which is easy to cause premature failure of the gear.
There are elastic oil hydrodynamic lubrication between the contact tooth surface, boundary lubrication and thousand friction phenomenon. The lubrication state is more complicated and the lubrication effect is very different. Most of the gear pair lubrication is out of this state. Close to elastic hydrodynamic lubrication, some close to boundary lubrication.
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