First, the standard sieve classification

Divided into: conventional standard sample sieve, chemical special sieve, soil special sieve, stone special sieve, sand special sieve, cement special sieve, asphalt special sieve, coal sample special sieve, metallurgical ore inspection sieve, etc.

Second, the standard sieve mesh material

Divided into three types, each with different characteristics and applications: wire woven mesh (the most widely used mesh from 2.36 mm to 0.02 mm only square hole mesh), perforated plate mesh (mainly used for large Mesh, there are two kinds of meshes of round and square holes from 0.2 to several hundred millimeters), electroforming screens (mainly used for high precision, each mesh can be within the average error range). Professional manufacturers as standard screens must have tool microscopes and projectors. Tool microscopes are used to check the accuracy of the mesh, using the arithmetic mean method (now the latest method is the normal distribution method).

Third, the advantages and disadvantages of three kinds of screen

Wire woven mesh: the lowest cost, good flexibility, but the lowest relative accuracy (allows large mesh), the mesh may be deformed, (the hole precision can be controlled by reaming and shrinking, and the hole can be fixed by electrochemical method) It is generally required that manufacturers with high-precision screen production capacity can ensure mass production (requires selection of screens conforming to GB/T6003.1-1997 standard from a large number of high-precision screens). The application industry is at most the diamond industry, especially the export manufacturers are required to be the standard negative difference, because the foreign surplus China is half the number, while the basic particles account for more than 90%, such as 230 is better between 75 microns and 63 microns.

Punching plate screen: The mesh is uniform and not easy to be deformed. It is mainly used for the detection of large particles. Because there are two kinds of round holes and square holes, it is used for round hole asphalt collection sieve and round hole coal sample sieve.

Electroformed screen: It is manufactured by electrochemical method with the highest precision. The theoretical precision can reach one micron. However, due to the different process molds of the manufacturer, there will be great differences, and the flexibility is not good, the crack is easy, the cost is too high, Suitable for production. In all kinds of industries in the country, there are screening screens such as Pharmacopoeia screens, sand screens, cement screens, etc., which are in accordance with industry requirements. The mesh and mesh tolerances are in accordance with GB/T6003.1-1997 and GB/T6003.2- 1997, GB/T6003.3-1997. The user's needs are various, but the mesh accuracy, the screen frame matching accuracy, and the material are basic requirements.