A linkage device, comprising: a drive component rotatable during a transmission stroke and an idle stroke; and a support member coupled to the drive component, wherein: the drive component and the support member are configured to rotate synchronously during the transmission stroke, and at least a part of the drive component is configured to idle with respect to the support member during the idle stroke; the support member has (i) a retracted position in which the support member is suitable for storage and (ii) a support position in which the support member is suitable for stopping and limiting, wherein the retracted position and the support position are switched by the transmission stroke; characterized in that: the drive component comprises a first shaft and a second shaft, the second shaft being coupled to the support member; during the transmission stroke, the first shaft, the second shaft and the support member are transmissively coupled and are configured to rotate synchronously; and during the idle stroke, the first shaft and the second shaft are transmissively separated and the first shaft is configured to idle, wherein the linkage device further comprises an overturning member coupled to the first shaft, wherein the overturning member is configured to drive the first shaft to reciprocally rotate, and in the support position, the support member is configured to stop and limit the overturning member; and the support member is configured to extend in a same direction as the second shaft in the retracted position, and the support member is configured to extend at an angle to the second shaft in the support position. a drive component rotatable during a transmission stroke and an idle stroke; and a support member coupled to the drive component, wherein: the drive component and the support member are configured to rotate synchronously during the transmission stroke, and at least a part of the drive component is configured to idle with respect to the support member during the idle stroke; the support member has (i) a retracted position in which the support member is suitable for storage and (ii) a support position in which the support member is suitable for stopping and limiting, wherein the retracted position and the support position are switched by the transmission stroke; characterized in that: the drive component comprises a first shaft and a second shaft, the second shaft being coupled to the support member; during the transmission stroke, the first shaft, the second shaft and the support member are transmissively coupled and are configured to rotate synchronously; and during the idle stroke, the first shaft and the second shaft are transmissively separated and the first shaft is configured to idle, wherein the linkage device further comprises an overturning member coupled to the first shaft, wherein the overturning member is configured to drive the first shaft to reciprocally rotate, and in the support position, the support member is configured to stop and limit the overturning member; and the support member is configured to extend in a same direction as the second shaft in the retracted position, and the support member is configured to extend at an angle to the second shaft in the support position. the drive component and the support member are configured to rotate synchronously during the transmission stroke, and at least a part of the drive component is configured to idle with respect to the support member during the idle stroke; the support member has (i) a retracted position in which the support member is suitable for storage and (ii) a support position in which the support member is suitable for stopping and limiting, wherein the retracted position and the support position are switched by the transmission stroke; characterized in that: the drive component comprises a first shaft and a second shaft, the second shaft being coupled to the support member; during the transmission stroke, the first shaft, the second shaft and the support member are transmissively coupled and are configured to rotate synchronously; and during the idle stroke, the first shaft and the second shaft are transmissively separated and the first shaft is configured to idle, wherein the linkage device further comprises an overturning member coupled to the first shaft, wherein the overturning member is configured to drive the first shaft to reciprocally rotate, and in the support position, the support member is configured to stop and limit the overturning member; and the support member is configured to extend in a same direction as the second shaft in the retracted position, and the support member is configured to extend at an angle to the second shaft in the support position. the drive component comprises a first shaft and a second shaft, the second shaft being coupled to the support member; during the transmission stroke, the first shaft, the second shaft and the support member are transmissively coupled and are configured to rotate synchronously; and during the idle stroke, the first shaft and the second shaft are transmissively separated and the first shaft is configured to idle, wherein the linkage device further comprises an overturning member coupled to the first shaft, wherein the overturning member is configured to drive the first shaft to reciprocally rotate, and in the support position, the support member is configured to stop and limit the overturning member; and the support member is configured to extend in a same direction as the second shaft in the retracted position, and the support member is configured to extend at an angle to the second shaft in the support position.