Application: The double compound extrusion line unit is mainly used for the continuous extrusion of semi-steel radial tires, all steel radial truck tires, bias tires and engineering radial tire tracks, sidewalls and peaks, etc. The use of various parts of the tire track and other parts in different specifications, the selection of different rubber formulations, the composite of radial tire components in various specifications in the composite machine head through two different specifications of pin-type cold-feed extruder. This type of machine adopts advanced pin-type cold-feed extruder as the working host; it adopts normal temperature feeding, and the extruded products have good compactness, high output and low energy consumption, and the drive system adopts DC speed regulation. Wide speed range, small size and precise control. The composite head is driven by full hydraulic pressure; under hydraulic drive, the operation of opening, closing and locking the machine head is very simple. The flow plate, preform and lip plate can be changed according to the product specifications, which ensures the stable size. The temperature control adopts a temperature control system, which can automatically adjust the temperature and automatically adjust the temperature of the production process within the range determined by the process to ensure the extrusion temperature of the product.