The working principle of the Hastelloy Grindability Index Tester is to grind a prepared coal sample with a certain particle size range in accordance with the grinding law (that is, the energy consumed in grinding pulverized coal is proportional to the new surface area generated by the pulverized coal), and then screen, weigh, compare, and calibrate the chart to find out the grindability index.
The measurement results of the Hardgrove Grindability Index Tester can accurately reflect the difficulty of coal grinding, providing a basis for the design and operation of coal mills. The machine has multiple functions such as mechanical loading, microcomputer counting, and automatic shutdown when the counter displays 60 revolutions. If the host fails, it can be stopped quickly, and when it is restarted, the revolutions can be accumulated.

1. Spindle speed: 20 ± 1 r/min
2. Limit working revolutions: 60 ± 0.25r
3. Load force: 284 ± 2N
4. Motor power: 90W
5. Rotating speed: 1400r/min
6. Power supply voltage: three-phase 380V
7. Instrument weight: 85kg
8. Overall dimension (length x width x height): 360x420x450mm