Design method of superfine powder concentrator based on coarse and fine separation of semi-finished products

Abstract

The invention discloses a design method of a superfine powder concentrator based on coarse and fine separation of semi-finished products. The superfine powder concentrator comprises a shell, a guide vane and a cage type rotor, wherein a coarse powder discharge port is formed in the bottom of the lower shell; a dynamic powder concentrating, returning and discharging hopper is arranged at the portion, on the lower part of the guide vane, in the shell; the portion, on the outer side of the dynamic powder concentrating, returning and discharging hopper, on the lower part of the cage type rotor is sleeved with a guide device; the guide device comprises a cone part positioned at the upper part and a straight cylinder part positioned at the lower part and is installed on the lower part of the guide vane; the upper shell and the middle shell are separated by the cone part of the guide device; the straight cylinder part of the guide device is positioned on the outer side of the dynamic powder concentrating, returning and discharging hopper so that an inner cylinder and outer cylinder structure can be formed in a static powder selecting area. According to the design method, the static powder concentrating area is additionally arranged in front of a dynamic powder concentrating area, material-carrying airflow is forced to enter the dynamic powder concentrating area from an inner cylinder, the dust collecting efficiency of coarse particles in semi-finished product particles is greatly improved, and the superfine powder concentrating process is facilitated; and the airflow entering the guide vane is distributed more evenly, materials entering a dynamic powder concentrator are closer to finished products, the powder concentrating efficiency is greatly improved, and the circulation load of the dynamic powder concentrator is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of grinding, and in particular relates to a design method of an ultra-fine powder separator based on the separation of the thickness of semi-finished products. Background technique [0002] Powder classifier is a kind of equipment that relies on air medium to sort materials. It is an important part of the grinding system. Its performance directly affects the technical and economic indicators of the entire system. Most of the existing dynamic powder separators use cage rotors with different blade structures as the core components, and the cage rotors rotate at high speed to generate rotating airflow, forming a dynamic powder selection area. After the particles to be selected enter the dynamic powder selection area, mainly under the balance of centrifugal force, airflow drag force and their own gravity, the coarse particles fall into the discharge hopper to form return materials, and the fine particles move to...

AI Technical Summary

Problems solved by technology

The cycle load refers to the ratio of the amount of powder returned by the classifier to the amount of finished products. When the efficiency of the classifier is low, the cycle load increases. From the perspective of productivity, the energy exerted by the classifier is not fully utilized.

[0003] The semi-finished product refers to the material that has been removed from the large particles through the previous sorting. The traditional semi-finished product sorting is to directly bring this part of the semi-finished product into the dynamic powder separator with the airflow for coarse and fine separation. This process has the following shortcomings: 1) Bringing it into the dynamic classifier Partitioned semi-finished products still contain a certain amount of coarse particles, and the finished products selected by the dynamic powder separator have different degrees of coarseness; 2) Obtaining the target particle size of ultra-fine finished products requires a higher cage rotor speed, resulting in The energy consumption of the powder separator increases; 3) The amount of semi-finished products is large, the concentration of powder selection is high, the efficiency of powder selection is relatively low, and the cycle load increases

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