The test sieve is a kind of sieve which is used for screening and particle size analysis of granular materials in accordance with a certain standard specification. As a general measuring instrument, it has a wide range of applications. It is suitable for particle size analysis and screening test in geological exploration, metallurgy, chemical industry, medicine, building materials, abrasives, minerals, cement, glass, grain, ceramics, papermaking and other industries, as well as scientific research institutes Useage In many industries, particle size control is an extremely important factor of product quality. For example, in the particle size analysis and screening test conducted in geological exploration, metallurgy, chemical industry, building materials, abrasive and other industries, the particle size control directly affects the final quality or survey results. In scientific research and design, the particle size composition of the processed raw materials and products is an important design and calculation data. Therefore, the test screen is of great significance to production, scientific research and design in the national economy