It is necessary to avoid welding the screen frame or other components on the installed polyurethane screen frame, and prevent the high temperature welding slag or objects from burning or burning the screen plate. 2. Minimize the entry of steel wire, iron nails, sharp metal objects, etc. into the sieve, or fall on the sieve from a higher part, and penetrate or damage the sieve surface. 3. During the installation of the sieve plate, all parts should be flattened, flattened with wooden strips, folded and pressed around the screen frame, so that the ore particles are evenly distributed on the screen surface, and no coarse particles are leaked around the screen frame. The purpose of sieving and grading. 4. The sieve holes have large and small heads. When installing, put the small hole surface on the top and the large hole surface on the bottom to prevent the ore particles from sticking into the sieve holes and not falling off. The board can be folded and dried and shaken or beaten with iron wire, and then it can fall off.