Combined machine tube for plastic extruder and moulding machine

The utility model relates to a combined machine barrel for plastic extruding machine and plastic injection machine. Bottom of outer barrel is provided with seamless steel tube with flange ring, and inner barrel is made by white iron. The inner barrel is installed inside the outer barrel. Outer layer of material intake is the white iron barrel inside the seamless steel tube, with the outer layer of the material intake is welded on reserve port on lower side of the outer barrel. The utility model has such advantages as scientific structure, reinforced inner barrel, strong wear resistance and low cost. Service life of the utility model is 4-5 times longer than current machine barrels. Locking is prevented during operation for the inner barrel and screw rod of different material and expansion coefficient.