The rack is welded with folded plates, which has a beautiful appearance; The power transmission adopts a motor and a four speed gearbox, with a gearbox transmission mode, a reasonable structure, and smooth operation; Equipped with an electronic meter that can instantly display meter length and linear velocity; When used in an extruder production line, it is driven by a DC motor or a variable frequency motor, which facilitates online control of the production line; When used in armored machines, shielding machines, and cable production lines, a four speed gearbox can be used in conjunction with it to form multiple pitches.