The selection of comminution equipment Generally, when producing ordinary fish feed, the granularity of its raw material is required to be about 40 mesh to 60 mesh, but when producing special aquatic grain pellet feed (shrimp, mash, mash, etc.), the granularity of the raw material must be 80 Above. The crushed granularity of the raw material determines the surface area of ​​the feed composition. The finer the particle size is, the greater the surface area is, the greater the moisture absorption capacity of the steam before granulation, which is conducive to quenching and granulation, and makes the pellets have good water stability and can be extended in water. The residence time of the product has good absorption effect, which can increase the return of feeding and reduce water pollution. In order to achieve the desired comminution particle size, the previously used hammer mill has not been applied to the production of fish feed. At present, the popular “water drop type†pulverizer at home and abroad is an advanced crusher model launched by European and American developed countries in the 1990s. This machine fully exploits the advantages of horizontal pulverizers and uses unique design ideas. The crusher can form two kinds of hammer screen gaps, which are respectively used for ordinary crushing and fine crushing. The crushing particle size is more uniform and the fine crushing particle size meets the production requirements of ordinary fish feed. After the model was put into the market, it was deeply favored by feed manufacturers. If special aquafeeds such as shrimps, soft-shelled turtles, and crabs are produced, the crushing particle size requirements are even smaller, and ordinary crushers do not meet the requirement for fine crushing, and must be selected using a micro-grinding machine. The micro-grinding of aquatic feeds often uses a secondary crushing process, ie, coarse crushing followed by micro crushing, and the second micro crushing. In the past, a large number of feed mills used micro crushers and micro-leveling machines to achieve the required crushing particle size. This process covers a large area, and the size of the crushed particles is achieved by replacing sieve plates of different pore sizes and adjusting the air volume of the system, and it easily causes the temperature of the crushed material to rise sharply, the nutritive components are destroyed, and the sieving phenomenon often occurs, resulting in equipment. Problems such as wear and waste of energy. If no screening micropulverizer is used to exclude the influence of the sieve plate, the pulverizer with the classifier can eliminate the material return treatment, the material temperature is low, the electricity consumption is saved, the output is high, and the thickness can be adjusted as needed. There is no need for additional micro-leveling machines. The vertical axis micro-grinding machine is a micro-grinding device that combines crushing, screening, and separation. It can meet the requirements for crushing granularity of special aquatic feeds. Because the crushing chamber and the classifying chamber are located in the same body, the crushing, air force screening, separation, and re-crushing processes can be completed at the same time, and over-comminution can be effectively prevented. Built-in high-precision micro-level wind classification, crushed and up to 60 mesh to 200 mesh, and can be adjusted. The crushed material has a low temperature rise and is particularly used for heat-sensitive materials. The entire process has a compact structure, a small footprint, low electricity consumption per ton of material, uniform product size and high output, and is ideal for the production of special aquatic feed microcrushing equipment.
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