Centering core shaft and unrolling device

The invention discloses a centering core shaft and an unrolling device. The centering core shaft comprises a core rod, a loop bar and a pressing piece. The loop bar sleeves the exterior of the core rod and is used for bearing a material roll. The pressing piece sleeves the exterior of the loop bar and is used for pressing and fixing the material roll. The loop bar and the pressing piece are additionally arranged on the centering core shaft, the material roll can be stably fixed to the core shaft in a centralized manner, axial playing is not likely to happen, centering of the material roll andthe centering core shaft is achieved, deformation or tensile failures are not likely to happen in the unrolling process, and the centering core shaft is compact in structure and convenient to operate. 本发明公开了一种对中芯轴及开卷装置，对中芯轴包括芯杆、套杆和压紧件，其中，套杆套设于芯杆外，用于承载物料卷；压紧件套设于套杆外，用于压紧并固定所述物料卷。本发明通过在对中芯轴增加套杆和压紧件，使得物料卷能够稳定对中地固定在芯轴上，不易在轴向窜动，实现物料卷与对中芯轴的对中，以在开卷过程中不易变形或被拉断，并且对中芯轴的结构紧凑，便于操作。