In the present invention, in order to detect the powder contained in the food powder, the positions of the magnets are staggered in a staggered manner, and a plurality of Gauss magnetic force rods formed integrally with magnets are arranged in a circle, and fastened to the first and second rotating flanges. The first and second rotating flanges are rotated and moved in the left and right directions while the first and second flange collection parts are located on both sides of the detection unit and the detection unit for detecting the powder by magnetic force on the Gaussian magnetic force bar between the first and second flanges. When connected to a hollow hydraulic cylinder driven by a hydraulic motor, if possible, rotating the Gaussian magnetic force bar is attached to the magnet by a ring brush fitted into the Gaussian magnetic force bar in the process of passing the magnet to the first waste powder collection section located on one side. 쇳 powder is separated and dropped on the 1st 수 powder collection box, and at the same time, the Gaussian magnetic rod with different magnet position is 쇳. When the powder is detected and the Gaussian magnetic force bar is returned to its original state, and then the cylinder rod of the hollow hydraulic cylinder is pulled out in the direction of the second rotating flange, the magnet is attached to the magnet by a ring brush in the process of passing the second waste powder through the magnet. The waste powder is separated and dropped into the second waste collection box, and at the same time, the Gaussian magnetic rod having different magnet positions repeats the method of detecting the wheat flour, so the powder detector does not stop working to remove the powder attached to the magnet of the Gaussian magnetic rod. It is characterized by improving the productivity by self-cleaning the Gaussian magnetic rod without.본 발명은 식품분말에 포함된 쇳가루를 검출하기 위해 자석의 위치가 엇갈리게 지그재그 방식으로 일부에만 자석이 일체로 형성한 다수개의 가우스 자력봉을 원형으로 배열하여 제 1, 2 회전 플랜지에 체결한 다
