roduct Overview:

The HTHM-60G Hardgrove Grindability Index Tester is specifically designed to determine the grindability of bituminous coal and anthracite, expressed as the Hardgrove Grindability Index (HGI). A higher HGI value indicates easier grindability. This instrument provides accurate data to reflect coal’s grinding difficulty, offering essential references for coal mill design and operation. Compact and user-friendly, it is widely used in coal, power, metallurgy, and chemical industries.

Working Principle & Structural Features:

The tester operates based on the grinding law (energy consumed in grinding coal is proportional to the new surface area generated). Prepared coal samples (specific particle size) are ground in the Hardgrove device, followed by sieving, weighing, and referencing calibration charts to determine the HGI.

Key Components:

• Grinding Assembly: Includes a grinding bowl with eight 25.4mm steel balls, driven by a motor (20±1 rpm) under a load of 284±2N.
• Upper Bowl Mechanism: Comprises a bridge base, spiral cam, bowl shaft, and handle for vertical lifting.
• Control System: Features an intelligent rotation counter with LCD display, auto-stop at 60±1/4 rotations, and emergency stop function.

Technical Specifications:

• Operation: Mechanical bowl lifting + microcomputer counting.
• Rotation: 20±1 rpm (Limit: 60±1/4 rotations).
• Load Force: 284±2N.
• Weight: 90 kg.
• Power: 90W, 380V.
• Dimensions (L×W×H): 360×420×490 mm.