JHGJ-4A-type sealed sample mill is based on our many years of experience in the production of coal mining, sample preparation, crushing and other laboratory equipment, developed a new type of sample preparation equipment, which increased the working positions, greatly improving the efficiency, using time alarm system, saving time. Advanced technology, simple operation. Especially suitable for coal, electricity, research and other industries and sectors broken coal, ore, rock or non-metallic material of medium hardness and brittleness of metals sample preparation. Sealed laboratory sample preparation grinder technical indicators and parameters of the project GJ-4A-type charge weight 100g * 4 charge size (mm) ≤15 discharge size (mm) 0.124-0.074 (80 mesh -200 mesh) grinding time 1 to 4 minutes Rated voltage (V) 380 Motor power (kw) 1.5 Total Weight (kg) 210 Dimensions (mm) 550 * 650 * 950