With the rapid development of China's industry, it is more and more important to detect the flow of materials inside the pipeline and find the blockage in time. In response to the needs of industrial production, the material flow detector independently developed by our company fully meets the relevant requirements and is widely used in various industries. In this case, our company's material flow detector is used to detect and block the pulverized coal injection branch pipe of a metallurgical blast furnace coal injection system. The rapidity, stability and reliability of the coal injection branch pipe inspection and plugging system are very important for the smooth operation of the coal injection system and the blast furnace. This system can not only improve the stability and uniformity of blast furnace pulverized coal injection, but also timely and accurately discover when the branch pipe is blocked, which is helpful for the on-site operators to take corresponding measures in time to avoid greater accidents. Get good results.