Belt checkweigher

A belt checkweigher comprises a feeding belt conveyor and a weighing unit, the weighing unit comprises a weighing sensor and a weighing belt conveyor, and the weighing belt conveyor comprises a weight conveying rack, a weighing belt, a weighing belt driving device and at least two belt shafts which are parallel to each other and are horizontally arranged. The belt shaft, close to the feeding belt conveyor, of the weighing belt conveyor is called as a first weighing belt shaft, the belt shaft, away from the first weighing belt shaft, of the feeding belt conveyor is called as a first feeding belt shaft, and the belt shaft, close to the first weighing belt shaft, of the feeding belt conveyor is called as a second feeding belt shaft. The part, wrapped by the weighing belt, of the first weighing belt shaft extends out relative to a cantilever of the weight conveying rack, the part, wrapped by the feeding belt, of the second feeding belt shaft also extends out relative to a cantilever of the feeding rack, and the e