The invention provides a method and a device for automatically controlling plate
discharge at the outlet of a
drying machine. The method comprises the following steps: limiting sensors send sensing signals to a controller; the controller selects a current layer according to the order of the received sensing
signal, sends a plate
discharge instruction to a stopper actuating device and begins timing, and the stopper moves downwards; the time is delayed by t seconds after the sensing
signal sent out by the limiting sensor of the current layer disappears and the controller sends a plate stopping instruction to the stopper actuating device; the stopper moves upwards and a plate stopping completion
signal is fed back to the controller; the next layer is selected and plate
discharge is repeated; when the time that the limiting sensor of the current layer continuously sends out the sensing signals reaches T, if the controller does not receives a plate stopping completion signal, the other
layers are selected to repeat plate discharge; when the time that the limiting sensor of the current layer continuously sends out the sensing signals reaches T1, if the controller does not receives the plate stopping completion signal, an
alarm device gives an alarm, wherein T1 is greater than T. if one layer is out of order, the other
layers are automatically controlled to perform normal plate discharge; the operation efficiency of the
drying machine is improved and the blockage of the
drying machine is avoided; as a result, the drying machine is convenient to maintain and clear.