. Main engine and accessory engine in all machines are connected by integral cast-iron bases, which make installation and maintaining convenient and using reliable. 2. Roller bearing is equipped with oil seal device. Manual solid oil lubrication assures the excellent lubrication effect and convenient use and keeps environment clean. 3. All transmission gears, made of cast steel, own advantages of high material strength, smooth operation, uneasy to fray and long service life. 4. Matched with emergency braking equipment, the machine can brake rapidly and safely under emergencies. 5. Roll spacing is adjusted by gear worm, which makes operation labor-saving, convenient and reliable. II. Application The machine is mainly adopted by rubber product plant to plasticate natural rubber, mix crude rubber and accessory ingredient or hot mix sizings.