Clays are the basis for a number of products, but the equipment necessary for processing the clay is much the same in each instance; consequently, lubrication problems have much in common. Clay based industries include brick manufacture, ceramics and tile. The earth may either be prepared at the point of consumption or crushed and ground at the mine for shipment. Normally, clay come from the mines or quarries as hard lumps which may be fed to a jaw or single roll crusher. The nature of the clay determines the method of crushing or grinding. Soft, friable earths require only crushing; while others have the particles partially cemented together and must be ground. Most of the drives for either purpose are by motors and reduction gears. These gears may be enclosed or open. The enclosed gears throughout the plants may be lubricated with oil 300 to 500 SUS at 100 degree F. This can be either a straight mineral oil or one containing a mild EP additive. Dust is almost certain to work into gear cases and, therefore, with large installations, circulating oil which can be filtered is desirable. Where this is not practical, the gear boxes should be drained every two to six months, flushed out and refilled. Open gears may be lubricated with a residuum of about 2000 viscosity SUS at 210 degree F which can be warmed for application. Frequent use will help flush off dust which becomes mixed with the lubricant. Following crushing or grinding, the clay is screened and the entire process may be repeated to obtain the desired fineness. Most clay is next mixed with water in pug mills and then are extruded or formed into desired articles. From such operations most clay based products are handled on conveyors unless placed on carts or cars for drying and burning or vitrifying. Even then, if the kilns are of the tunnel variety, further conveyor chains may move the carts through the kiln. Much of this equipment is driven by reduction gears, often enclosed. Therefore the same type and grade of lubricants as were mentioned earlier can be used throughout the plant. Gears should not be present in kilns and, therefore, are not subjected to any great heat. Other types of equipment, if present, can receive similar lubrication. These might include drives for elevators, augers, cutting machines and fans.
Thursday, November 22, 2012
Clay processing Plants and gear Lubrication
Clays are the basis for a number of products, but the equipment necessary for processing the clay is much the same in each instance; consequently, lubrication problems have much in common. Clay based industries include brick manufacture, ceramics and tile. The earth may either be prepared at the point of consumption or crushed and ground at the mine for shipment. Normally, clay come from the mines or quarries as hard lumps which may be fed to a jaw or single roll crusher. The nature of the clay determines the method of crushing or grinding. Soft, friable earths require only crushing; while others have the particles partially cemented together and must be ground. Most of the drives for either purpose are by motors and reduction gears. These gears may be enclosed or open. The enclosed gears throughout the plants may be lubricated with oil 300 to 500 SUS at 100 degree F. This can be either a straight mineral oil or one containing a mild EP additive. Dust is almost certain to work into gear cases and, therefore, with large installations, circulating oil which can be filtered is desirable. Where this is not practical, the gear boxes should be drained every two to six months, flushed out and refilled. Open gears may be lubricated with a residuum of about 2000 viscosity SUS at 210 degree F which can be warmed for application. Frequent use will help flush off dust which becomes mixed with the lubricant. Following crushing or grinding, the clay is screened and the entire process may be repeated to obtain the desired fineness. Most clay is next mixed with water in pug mills and then are extruded or formed into desired articles. From such operations most clay based products are handled on conveyors unless placed on carts or cars for drying and burning or vitrifying. Even then, if the kilns are of the tunnel variety, further conveyor chains may move the carts through the kiln. Much of this equipment is driven by reduction gears, often enclosed. Therefore the same type and grade of lubricants as were mentioned earlier can be used throughout the plant. Gears should not be present in kilns and, therefore, are not subjected to any great heat. Other types of equipment, if present, can receive similar lubrication. These might include drives for elevators, augers, cutting machines and fans.
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