Application and efficiency analysis of vibrating screening equipment in feed processing

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Mechanical screening is the main screening technology of the feed mill. The main working compone of the vibrating screen equipment are screen surfaces. It is widely used for steel sheet punch screen and knitted screens. The pig e net users will introduce the application of the feed screening. Aspects and general calculation methods. Application of Screening Technology in Livestock Feed Processing is concentrated in two aspects, one is to clean the impurities in the raw material, and the second is to grade the raw material or product according to the particle size, including raw materials. Impurity cleaning, pulverizing material grading, powder impurities before granulation, granulation of granulation products. The quality of screening effects during processing has a considerable impact on the quality and yield of feed products. 1 Screening Efficiency and Its Influencing Factors 1.1 Screening Efficiency – Serving Animal Science Efficiency includes two aspects: the screeing ratio on the screening material (expected sieve) should be retained and the ratio should be retained by screening materials (expected sieves). Th two indicators affect the clearance effect of impurities in the cleaning operation, the loss of net raw materials, affect the particle size and yield of the product in the grading operation, which affect the reliability of the grading results in the test. The former is called the screening rate, the latter is called a mistake, expressed as the formula: eta; 1 u003d W1 / W2 Ti ; 100% Service Livestock Eta; 2 u003d W3 / W4 Ti ; 100% Serving Livestock Formation Eta; 1 Mdash; Screening Rate,%; ETA; 2 Mdash; Mse Rate,%; W1 MDSH; Pre-scheduled screen storage, kg / h; w2 mdash; expected sieve material, kg / h; w3 mdash; pre-screen storage amount, kg / h; w4 mdash; expected sieve Quantity, kg / h. The above two indicators are used to evaluate cleaning screening efficiency. When the sieve is impurities, eta; 1 is equivalent to the miscellaneous ratio, eta; 2 is equivalent to net raw material loss rate . 1.2 Effects of Screening Effects Through the Maximum Material Particle Diameter of Sieves Can Estimate: serving livestock D u003d D cos alpha; -E sin alpha; , D MDash; Mm; D MDash; sieve diameter, mm; d mdash; sieve diameter by screening holes mm; e mdash; screen hTrail, mm; alpha; mdash; sieve angle. From Equation (3) It can be seen that the sieve diameter, h diameter, and the screening angle affect the maximum particle diameter of the particles through the screen. However, equation (3) can only determine the critical particle size, and a particle smaller than the critical particle size can pass the screen, but also depends on other conditions. 1.2.1 Granules and Sieve Shape Serving Livestock (3) Based on Spherical Particles and Circular Sieves, In the actual production of the feed industry, the sieving raw materials are mostly cylindrical (granular feed grading) or irregular particles, and the screen is both circular and rectangular, and the state of the material particles contact the particles can be affected by the particles. Such as a §b4 Ti ; 10 mm of particles can pass through a screen hole of 5 mm, the horizontal direction. Therefore, the particles have a certain amount of occasion, and can only be studied by statistical means. Generally, the cylindrical particles, rectangular screen holes are preferably in performance; irregular particles hng a difference in size in each direction, and the passivity of the circular holes is better. 1.2.2 Screen Open Hole Rate the larger the opening rate of the service livestock screen, the better the performance. When the screen strength is guaranteed, the braided screening can achieve a higher opening rate than the punching screen, so the former is superior to the latter. 1.2.3 Material Layer Thickness Using Plane Sieves, such as the material layer of the vibrating sieve surface is too thick, the material layer upper part Small particles are difficult to pass the screen, which will cause a mistake rate, which will increase the net raw material loss in the raw material cleaning. In the granule grading, the output will reduce the yield (the upper sieve layer is too thick), affecting the quality of the finished product (lower sieve Layer is too thick). The material layer is too low, and the output is too low, and it is not advisable. Suitable material layer thickness should be determined by experime, and the sieve angle is small, and the amplitude of the sieve amplitude can be slightly thicker. In theory, the thickness of the material layer is determined by yield, but in practice, the material may be concentrated on the sieving surface side due to the measuring screen feeding, resulting in the topmost layer to affect the screening effect. There are similar problems in the cylindrical screen and cone screen. When the instant material flow is too large, the screening effect is also affected. 1.2.4 Sieve Motion Status – One of the necessary conditions for feed, serving livestock screening process is to screen the material and screen surface The relative movement, the method of producing such a relative movement can be that the screen surface is horizontally movable (rotation), vertically re-line motion (vibration) or a combination of the two. The sieve is only horizontally recovered or vertically reciprocated, and the screening effect is not ideal. The latter due to materialThe lack of movement with the horizontal level of the screen is easy to cause the material layer thickness. Practice has shown that the combined swing vibrating sieve effect in combination with two motion is better. 1.2.5 Materials Serving the Particle Size, Water Rate, Friction Characteristics, Mobility, etc. The difference in particle size of material particles is the premise of the separation of material compone, and this difference is, the easier the screening process is performed. The higher the material content, the larger the friction angle of the internal and external, the worse the fluidity, the worse the performance of its particles through the screen. Therefore, in actual use, different process parameters should be selected depending on the specific conditions of materials.

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