Feeding and discharging device

The feeding and discharging device comprises a lifter, a lifting detection piece, a material tray detection piece and a controller, and when the lifter does not reach a tray discharging position, thecontroller controls the lifter to drive a material tray to descend by a preset height relative to a preset position according to signals sent by the lifting detection piece and the material tray detection piece at the same time so as to receive workpieces; when the lifter reaches the tray outlet position, the controller controls the lifter to drive the tray to descend until the tray is taken downaccording to signals sent by the lifting detection piece and the tray detection piece at the same time; the material disc receives workpieces at the same height each time, the stacking height of the workpieces is prevented from being influenced by the workpiece quality and human interference, the workpieces are prevented from being crushed, and therefore the workpiece quality is improved. 本实用新型公开一种上下料装置包括升降机、升降检测件、料盘检测件和控制