Crushed material with same size, length and width can be adjusted, save labor, stable performance and high efficiency. New rack structure is scientific, reasonable and safe, and the performance is reliable; stable operation makes the machine easy to handle. With good loosening and cleaning effect, and the machine enjoys high output, low loss, and low noise. Adopting oblique gear speed reducer makes the good adaptability during the long time working, so the machine will not heat easily and has a longer lifespan. Equipped with the new designed rack, with the loosing and recycling combined working pattern, the machine reduces the damage to fiber, and protects the length of fiber.