Feed production is a combination of processing equipment and conveying equipment. Reasonable design and selection of equipment is also an important part of safe feed production. Mainly to reduce the material classification and residue in the process, while using heat treatment during processing to eliminate the effects of anti-nutritional factors and harmful microorganisms in the raw materials.
1. Grading of the processing process In the feed processing, the density difference of the feed components, the difference of the carrier particle size, and the minor components such as additives and the other components in the feed are insufficiently mixed, which is to produce grading. important reason. Processes such as conveying, charging and unloading of raw materials can also cause grading, and improper design of manual operations and processing processes can also cause grading. The measures to reduce the classification are to rationally design the feed processing process and select high-quality and precise equipment; to ensure the uniform mixing of the raw materials by adjusting the composition of the raw materials and the particle size of the crushing; to effectively carry the micro-components to change the mixing of the minor components. Characteristics; adding liquid components to increase the adhesion of the powder; granulating or expanding the product also helps to avoid the above phenomenon. For powdered products (especially composite premixes), the finished powdered material after mixing should minimize the transport distance to reduce the impact of material grading.
2. Residual contamination of the process Many factors can cause residual contamination of the feed in the equipment leading to cross-contamination. If appropriate measures are taken in process design and equipment selection, residue generation can be reduced. In the process design, the conveying process uses the form of the distributor and the self-flow as much as possible, and the horizontal conveying is less used. For horizontal conveying equipment, such as screw conveyors and scraper conveyors, there are more or less residuals due to structural reasons. The equipment should be designed to be easy to enter and easy to clean, or to use a self-cleaning scraper conveyor. Under the conditions that meet the process requirements, minimize the number of material lifts and the number of buffers. The suction and dust removal system should be equipped with an independent wind network as much as possible, and the collected dust should be directly sent back to the original place to avoid secondary pollution. In particular, the production of the compound premix for dosing should be handled in this way. The metering of minor components should be arranged as far as possible in the upper part of the mixer. If it has to be lifted or transported after metering and weighing, high-density pneumatic conveying must be used to prevent classification and residue. High-risk trace components such as drugs must be added directly to the mixer. For the production of medicated feeds, special production lines should be used as much as possible to minimize the risk of cross-contamination. In order to reduce the impact of residues on the feed, some cleaning devices can be designed to clean up special parts of certain equipment with compressed air. In the selection of equipment, the accuracy of the electronic type and mixing equipment of the measuring equipment should be determined. The measuring equipment and the electronic scale should be determined according to the nature of the different proportioning materials in the range selection. The metering equipment with the same scale is used to meet the measurement of different materials. Requirements. In the production of compound feed and composite premix, the choice of mixer is important. The mixer should be able to achieve a mixing accuracy of not more than 5% with a coefficient of variation of one hundred thousandth. The mixer should be designed to ensure that only as little material remains in the mixer after each batch of material has been mixed. Due to different particle size and different final product requirements, in the production of premixed feed, the particle size of the material is small, the mixing uniformity is high, the required residue is small, and the material has static electricity during the mixing process. The characteristics of the mixture are different for the mixer. Buckets, buckets, batching and buffering hoppers also produce residues. When selecting equipment, the inner surfaces of the slides, silos and hoppers should be smooth and free of dead spots. Unreasonable liquid addition methods will also have an impact on the residue of the material, so be careful.
[NextPage]
3. Application of heat treatment process The effect of tempering heat treatment before conventional granulation depends on temperature, time and quality of steam. The role of quenching and tempering is to improve the quality of pellet feed, improve feed digestibility, and at the same time destroy the anti-nutritional factors in the raw materials, kill harmful microorganisms in the raw materials, and control the sanitary quality of the pellet feed. This quenching and tempering treatment is limited by the structure of the pellet machine, and the conditioning effect is not satisfactory. At present, the improvement in quenching and tempering treatment is mainly to increase the quenching and tempering distance to prolong the quenching and tempering time, so that the hygienic quality of the feed after quenching and tempering is improved. Another method is to use the expansion or extrusion method to make full use of time and temperature, combined with mechanical shearing and pressure, the treatment intensity is high, and the sterilization effect is more obvious. Expansion or extrusion puffing and tempering make the sanitary quality of the feed better.
4. Problems with external spraying application The heat sensitive substance will cause loss during the heat treatment process. Therefore, it may not be added during the quenching and tempering process, but may be added by external spraying. These substances are added to the surface of the particles, which may cause particle pulverization during transportation or transportation, and the surface coating material may be pulverized to produce an enrichment effect and evenly distributed. Therefore, the outer coating of the particles should make the outer coating material and the particles tightly combined, and the processing quality of the particles is the guarantee of the quality of the outer coating. Generally, the effect of the outer coating of the extruded product is ideal.
Traffic Sign, Active Luminous Sign, Road Traffic Sign, Custom Traffic Sign, Highway Traffic Sign
Jiangsu chuanglv Transportation Facilities Co., Ltd , https://www.clsolarlights.com