The mainframe adopted new type of high effective extruder. The mantle bolt adopts 38CrMoA1A treated by nitriding surface of the material with the higher corrosion resistance and wearing strength; all the driving motors are adopted electromagnetic governor motors, flexible and convenient in adjustment and can perform the infinitive stage transmission by controller; two types of oven such as, traditional curved oven and pulling and extending oven. Traditional curve oven is cheaper and pulling and extending oven has the merit of high output, low energy consumption, compact structure, good quality, steady running, easy operation, good-looking outline, safe and reliable, etc.