Small screw diameter, high speed, large output, high precision and good conveying condition.They are driven by gear boxes for maximum torches, lowest noises, oil sealing and long duration.The conveyor housing is made of qualified seamless pipes and flanged for maximum capacity and can be operated for continuous conveying at horizontal or inclined position with enough flexibility and convenient transportation. Also with the good qualities of seal, no dust leakage, safety and reliability, our products have become the perfect environmental protection products and received six national patents