The unit adopts special-designed SJSZ80 Cone Double-Screw-Stem Extruder, adopts imported frequency converter for governing. It adopts imported RKC temperature controller. It has advantages of wide adjustment range, high precision, convenient operation and so on. The auxiliary machine is composed of vacuum shaping table, drawing machine, cutter and turn-over frame. The unit adopts large cooling device to ensure the shaping result of door plate. The caterpillar drawing machine adopts imported reducer, motor and frequency converter. It has reasonable structure, large drawing force, steady drawing and others. The cutter has advantages of reliable and correct work, high precision of cutting and others. The turn-over frame has mobile lorry and special rubber protection layer. It has advantages of no-wearing, simple use and others. The auxiliary machine adopts programmable controller or control system made in China. The control of the whole machine is reliable and steady.