Multidirectional-shifting comb plate expansion device

A multidirectional-shifting comb plate expansion device comprises a fixed toothed plate and a movable toothed plate, the end of the movable toothed plate is connected with a bridge body through a multidirectional-shifting system, the multidirectional-shifting system comprises a hinge rotating shaft mechanism and a toothed plate pre-tightening mechanism, the hinge rotating shaft mechanism comprises a left rotating shaft box and a right rotating shaft box which are as same as in structure, each of the left rotating shaft box and the right rotating shaft box consists of a rotating shaft box upper plate and a rotating shaft box lower plate, the left rotating shaft box and the right rotating shaft box are fixedly connected on the bridge body through bolt components, a rotating shaft hole is arranged at the center of each of the left rotating shaft box and the right rotating shaft box, the movable toothed plate is rotatably connected with each rotating shaft hole through a toothed plate rotating shaft on two sides