a base comprising a driving module and a base hollow portion, wherein the rotating shaft passes through the base hollow portion along an axial direction;

an upper plate spatially corresponding to the base, spaced apart from the base along the axial direction and disposed on the base;

a sliding plate disposed between the base and the upper plate, and driven by the driving module to be attached to the base or be spaced apart from the base along the axial direction;

a transmission component sleeved and fixed on the rotating shaft to rotate synchronously with the rotating shaft, wherein the transmission component comprises a sleeved peripheral edge, a limiting portion and a plurality of perforations, the limiting portion is protruded outwardly from the sleeved peripheral edge in a radial direction of the rotating shaft, and the plurality of perforations are passed through the limiting portion along the axial direction;

a lining plate sleeved on the sleeved peripheral edge of the transmission component along the axial direction, engaged with the sleeved peripheral edge of the transmission component, and carried on an upper surface of the limiting portion, wherein the lining plate is located between the sliding plate and the upper plate, wherein when the driving module drives the sliding plate to be spaced apart from the base, the lining plate is clamped by the sliding plate and the upper plate, so that the transmission component and the rotating shaft are stopped and motionless synchronously, wherein when the driving module drives the sliding plate to be attached to the base, the lining plate is spaced apart from the sliding plate and the upper plate, so that the lining plate is driven by the transmission component to rotate;

a plurality of connection elements and a planar plate, wherein the planar plate is spatially corresponding to the lining plate, and the plurality of the connection elements are connected between the planar plate and the lining plate through the plurality of perforations, respectively; and

a plurality of elastic components, wherein each of the plurality of elastic components is sleeved on the corresponding one of the plurality of connection elements, and disposed between the planar plate and a lower surface of the limiting portion, and the plurality of elastic components are configured to provide a resilient force, so that the lining plate is driven by the planar plate to abut against the upper surface of the limiting portion along the axial direction.