Technical Specifications for Hardgrove Grinidibility Machine

The  HGI Machine for coal/coke  as per IS: 4433-1979.

The machine includes stationery grinding bowl of hardened manganese steel  with a horizontal track in which run eight steel balls each 24.000±0.003 mm diameter. The balls shall be driven by an upper grinding ring rotated at 19 to 21 re./min. the upper grinding ring of similar material to the bowl is connected to a spindle and shall be driven by an electric motor through reduction gears. Weights shall be added to the spindle so that the total vertical force on basis due to the top ring, gear, weights and spindle is 284±2N, closely equivalent to a total mass of 29±0.2 Kg. The machine shall befitted with a digital revolution counter and an automatic device for stopping machine after 60±0.25 revolutions.

Reduction Gear made of GEMICON.

Motor make Kirloskar/Crompton

Motor : 1 HP , three phase, 440 volt, 50 cycles, AC. Sieves : SS wire net brass sieves

200 mm dia of 1.18 mm, 600 micron , and 75 micron with cover & receiver,  about 200 mm diameter.

Hardgrove Grinidibility Machine, for coal/coke  as per IS: 4433-1979. The machine consists of a stationary grinding bowl of hardened iron or steel, with a horizontal track in which run eight steel balls, each 25,400 +/- 0.003mm. diameter. The balls shall be driven by an upper grinding ring rotated at 19 to 21 revolution per minutes. The upper grinding ring of similar material to the bowl, is connected to as

spindle and shall be driven by an electric motor through reduction gears. Weights shall be added to the spindle so that the total vertical force on the balls due to the top ring, gear, weights and spindle is 284 +/- 2 N. for example, closely equivalent to the total mass of 29 +/- 0.2 kg. The machine shall be fitted with electric automatic predetermine revolution counter for stopping the machine after 60+/- 0.25 revolution.

Suitable operation on 230 volts single phase, 50 cycles A.C. supply.