Weighing device, weighing system and production line

The utility model discloses a weighing device, a weighing system and a production line, the weighing device is used for weighing workpieces, the weighing device comprises a weighing assembly, a grabbing part and a first translation assembly, the weighing assembly comprises an operation surface, and the operation surface comprises a feeding position, a weighing position and a discharging position which are arranged in sequence; the weighing assembly comprises a frame and a weighing part, the feeding position and the discharging position are located on the frame, the weighing part is arranged in the frame, the weighing position is located on the weighing part, and the weighing position is used for weighing workpieces. The grabbing part is arranged above the operation surface, can translate in a plane parallel to the operation surface, and can pass through the upper parts of the feeding position, the weighing position and the discharging position; the grabbing piece is used for grabbing or loosening the workpiec