Interior protective shroud reducing device

The utility model provides an interior protective shroud reducing device, includes frame (1), frame (1) is equipped with adjusting mechanism and actuating mechanism, adjusting mechanism includes spiral guide plate (2) and extrusion wheel, and spiral guide plate has starting point (A) and a terminal point (B), the extrusion wheel is including last extrusion wheel (3) and lower extrusion wheel (4), be equipped with extrusion wheel (3) and extrude wheel (4) down in starting point (A) the dead ahead of spiral guide plate (2), down extrusion wheel (4) the peak with deflector (2) parallel and level is gone up and is extrudeed wheel (3) and extrude down apart from 0.05 little~0.1mm than backplate thickness between the wheel (4). Interior protective shroud reducing device has simple structure, and convenient operation can solve the practical problem, brings the benefit for the enterprise. 种内护圈变径装置，包括机架(1)，所述机架(1)设有变径机构和驱动机构，所述变径机构包括螺旋导向板(2)和挤压轮，螺旋导向板具有起点(A)和终点(B)，所述挤压轮包括上挤压轮(3)和下挤压轮(4)；在螺旋导向板(2)的起点(A)正前方设有上挤压轮(3)和下挤压