Chain-type jacking device and working method thereof

The invention provides a chain-type jacking device, which comprises an outer jacking skeleton, an inner jacking skeleton and a jacking mechanism, wherein a base frame and a group of upright side columns are arranged in the outer jacking skeleton; the upright side columns are arranged on two sides of the base frame; the tops of the upright side columns are connected horizontally through a group ofjacking connecting rods; the inner jacking skeleton is arranged in the outer jacking skeleton; a motor reducer, drive shafts, a guide rod and a linear bearing are arranged in the jacking mechanism; the motor reducer is mounted on the inner jacking skeleton; and an output end of the motor reducer is arranged on a driving gear. The driving gear is driven by the motor reducer to drive a driven gear,which then drives a first drive shaft to rotate together, and a second drive shaft is driven by the first drive shaft to rotate together; and during the rotation, because the two ends of each of a first chain and a second chai