Coarse crushing screw is applicable to pharmacy, chemical engineering, metallurgy, food and construction industry. It can be used to process hard and solid materials and to crush materials like plastics, copper wire, Chinese herbal medicine and rubber. Coarse crushing screw can be used as associated equipment at the former procedure for micro-grinder and ultrafine pulverizer. Coarse crushing screw is able to save 40-50% energy, greatly reducing labor intensity.