(1) Determine the ratio of the maximum particle size D of the material before crushing to the maximum particle size d after crushing I=Dmax/dmax Where D is the largest block diameter of the material before crushing, mm. D—the maximum diameter of the material after crushing, mm. The maximum diameter can be found by the cumulative mass percentage curve under the screen. The particle size corresponding to 5% or 20% in the curve is the maximum block diameter, which is the width of the square mesh through which 95% or 80% of the material can pass. Many experiences have shown that the largest block in a material accounts for about 5% or 20%. Due to the different technical habits of different countries, the width of the sieve holes that 80% of the materials taken by the United Kingdom and the United States can pass is the maximum block diameter, and 95% of the materials are taken in China. The width of the mesh that can pass, the former Soviet Union is the same as our country. This calculation is commonly used in design because the width of the feed port of the crusher is chosen according to the diameter of the largest block. (2) Determine the ratio of the effective width of the feed opening of the crusher to the width of the discharge opening I=0.85B/S Where B is the width of the feed opening of the crusher, mm. S——The width of the discharge opening of the crusher, mm. Because the diameter of the largest block fed into the crusher should be about 15% smaller than the width of the feed port of the crusher to be clamped by the crusher. Therefore, 0.85B in the above formula is the effective width of the feed port of the crusher. For the coarse crusher, the discharge opening takes the maximum width; for the center and fine crusher, the minimum width is taken. This calculation is useful in production because the fracture ratio can be estimated using the above formula as long as the width of the feed and discharge openings of the crusher is known. It is also possible to use the ratio of the maximum feed port size to the maximum discharge port size as the crush ratio, which is called the nominal crush ratio. (3) Determine by average particle size I=D average/d average In the formula D average - the average diameter of the material before crushing, mm. d average - the average diameter of the broken material, mm. The materials before and after crushing are statistical aggregates composed of several grain sizes. Only the average diameter can represent them. The crushing ratio calculated by this method can reflect the degree of fracture more realistically, so it is used in theoretical research. The crushing ratio of the material is an important basis for determining the selection of mechanical equipment for the crushing process.
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Crushing ratio calculation method of crusher
In order to explain the change in the size of the material before and after the crushing of the crusher, that is, the degree of pulverization, it is expressed by the pulverization ratio (also referred to as the pulverization degree) I. There are several calculation methods for the crushing ratio of the crusher: