The application of Vibrating Screen in the feed processing the industry is mainly concentrated in two aspects: one is to clean up the impurities in the raw materials; the other is to classify the raw materials or products according to the particle size (including the cleaning of the impurities in the raw materials and the classification of the crushed materials). , cleaning of impurities in the powder before granulation and grading of granulated products.)
Below we will focus on the cleaning of the powder and the classification of the crushed material.
Raw materials that do not need to be pulverized are generally referred to as powders. There are many kinds of powders in feed mills, and the dosages are different. Most of them are by-products of the grain industry or other industries. Therefore, the impurity content is not high, and the large impurities such as hemp rope and sack pieces mixed in the process are mainly used. In the production of full-price feed and concentrated feed, it can be cleaned by a conical primary clear screen, flat rotary screen or Vibrating Feeder.
The mixed material is preferably sieved with a conical primary clearing screen before granulation. On the one hand, impurities which may be mixed during the processing and which cannot be removed in the raw material cleaning can be cleaned, and on the other hand, the agglomerated materials can be broken up. This is especially important for a feed after injection. The output of the cleaning screen should match the mixer.
The size of the mesh used for the cleaning of powdered raw materials varies with the nature of various raw materials, generally φ6-φ10 mm, with relatively good fluidity such as small values for mineral raw materials, and poor fluidity such as bran and fishmeal. , meat and bone meal, etc. should choose a large value.
In the premix processing, the particle size of the powder (such as the phosphate) is very small, and the impurities are often the fine particles generated during the processing of the raw material. Generally, the screening the machine is difficult to clean, and the high-screen sieve of the milling industry can be used as the Clean up the device.
The classification of the product is to divide the product into two or more products by screening treatment according to the difference in particle size. The feed industry is mainly used for grading of comminuted materials, grading of granules and determination of granules of materials.
Grading of crushed material
The secondary pulverization process requires the use of screening techniques. In the production of common livestock and poultry feed, a rotary screen or a vibrating screen is generally used to form a closed loop, and the sieved material is returned to the crusher, and the sieved material enters the batching bin. Generally, the mesh size is φ1.2 mm.
In the micro-grinding process of premix and fish and shrimp bait production, the material crushing size is often required to pass through the 60-80 mesh standard sieve (0.42-0.18 mm). If mechanical sieve is used, the material is too small and the material is cohesive. In the knot, it is difficult to sieving the granules, which will cause the sieving efficiency to decrease, and the amount of pulverization and pulverization increases, so airflow grading can resolve this contradiction. Airflow grading is a generalized sieving technique that controls the flow of material or the size of the next process by adjusting the process parameters of the airflow. The airflow, wind speed, and wind pressure vary with the material type and its particle size control range.
Fourth, the classification of the pellet feed
In the processing of pellet feed, in order to increase the output of the granulator and reduce the energy consumption of granulation, large-diameter die holes are often used for production and then broken into small particles. After the particles are broken, it is classified, and the fine powdery material (the unformed powder in the granulation process or the powder produced during the crushing process) and the excessively coarse particles (the particles which are not sufficiently broken) are separated to make it enter. The particles in the finished product processing section meet the product particle size requirements. The granule feed is graded by using a two-layer sieve surface, the upper sieve the surface is subjected to a reflux crusher, the lower sieve mesh is returned to the granulator, and the intermediate layer is a finished product. It can be seen that the size of the mesh used in the grading screen directly affects the product size.
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