Coal Plants

Gears and gear equipments have a wide range of applications in coal mining activities. Heavy weight gear boxes are used for the heavy machineries used in the coal mines. Girth gears are used in the equipments and spares used in the sponge iron plants along with other devices. In the equipment handling and material preparation machineries used in the coal mines, specialized gearboxes are used. There are two basic gearing principles used in the Coal mining industry. These two gearing principle which are used in the coal mining are:

• Craggy reliable gearing
• Worm Gearing

These two gearing principles are used in a lot of mining machine drives, such as axle drives for forming tunnels for the locomotives, special cutting machines, coal drifting machineries etc.

Coal mine machineries and gear applications

Compressors for Coal Mills
These compressors consist highly effective impellers, radially split barrel casings. This compressor is used in the coal mines to evacuate the light gas from the coal mines. The operational speed of this compressor is very high and it is about 15,000 rpm. Planetary gears are used in these compressors. By installing planetary gears, the weight of the compressor can be reduced up to 30-40%. if the installed bevel gears are accurate, the noise level may be reduced significantly. The bevel gears are placed inside a compact cylindrical gear case.

Diesel and Gasoline Locomotives
Diesel and Gasoline Locomotives use gear drives. These locomotives are manufactured in a wide varieties from 3 tons to 35 tons in weight and having wide to narrow gauze. The inclusion of gears in itself has enhanced its performance superiority. In these locomotives, there are one distinct type of spur gear, three-point suspension and a transmission having a constant mesh with four forward and reverse speeds. In these locomotives, smooth gear change is ensured at much higher speeds and gear-stripping is completely eliminated. In the usual system of locomotives, the smoothly gear changing at a much higher speed is not possible.

For example, a 42" gauze 20-ton four-wheel locomotive, contains one high speed traction motor with double reduction gears, one diesel-electric power plant of 250 hp. Capacity and a counter balance side rods.

Trolley
Generally, the trolley locomotives consist of two motors. Each motor is mounted on each axle and is driven by single reduction spur gear. The spur gears are placed in suitable welded gear cases. In some trolley locomotives, there is only one motor.

Cages
The winding gears are generally used in the deep mines to dig-out the coal on the surface. The winding gears are also used to allow men to reach the pit face. The cages, which are used in supplying the necessary things and equipments, winding gears are used. The winding gears help the cages to go down slowly in the coal mines.