Winding and unwinding apparatus, and preparation system of electrode plate

A winding and unwinding apparatus, comprising:

• a support;
• a rotating shaft capable of being rotatably disposed on the support;
• a rotating turret disposed on the rotating shaft and capable of rotating along with the rotating shaft so as to switch between at least two target operation positions, wherein the rotating turret is configured for mounting a winding drum;
• and
• a power assembly disposed on the support and comprising a first power source and a magnetic powder clutch, wherein the rotating shaft and the first power source are in transmission connection with each other via the magnetic powder clutch, and the magnetic powder clutch is configured to control the rotating shaft to remain stationary when the rotating turret is hovering at each target operation position,
• wherein the winding and unwinding apparatus further comprises a fastener and a positioning assembly, the fastener being fixed to the rotating shaft, the positioning assembly being disposed on the support, and the positioning assembly being configured to be capable of switching between a first state and a second state;
• wherein
• the positioning assembly in the first state is capable of avoiding the fastener;
• and when the rotating shaft remains stationary, the positioning assembly is in the second state and is in non-rotatable connection with the fastener.