Elevating mechanism for corrugated expander

The invention discloses an elevating mechanism for a corrugated expander. The elevating mechanism comprises a square bracket, wherein a rope tightener is arranged at the front side of the square bracket; slide bars are fixedly arranged near the left side and the right side between the front side and the back side separately; columnar connectors are arranged at two ends of each slide bar separately; a through hole vertical to one columnar connector is arranged in the columnar connector; the slide bars pass through the corresponding through holes; compression springs are fixedly arranged at theleft side and the right side of each slide bar between two front and rear connectors separately; two support arms are arranged between two front and rear connectors, opposite ends of the support armsare rotationally arranged on a same jacking block and departing ends are rotationally arranged on two front and rear connectors separately; a jaw is arranged on the top surface of each jacking block;first fixed pulleys are arr