Factors affecting the length of granulator particles and their control

LIMA Fish Feed Machine,Chicken Feed Machine

With the booming of the modern aquaculture industry and the feed industry, the quality requireme of the feed are increasing, and the length of the particles is a very important quality assessment indicator for the particulate feed produced by granulator. The length meets the requireme, neatly The consistent pellet material is not only the need to meet the sales of feed manufacturers, but also the needs of users actually cultured, the particle feed is too long, too short or uneven is not conducive to the food of animals. In actual production, the particle length of the granulation machine generally requires 2 to 3 ti the particle diameter, such as a particulate material hng a diameter of §æ3mm size, which is generally 6 to 9 mm, of course, according to the actual user needs and different Feed varieties, its length requireme are not necessarily within this range. Therefore, in order to produce the length of the feed particles that meet the requireme or to be close to the required feed particles, it is discussed some factors that affect the length of the granulator, and the corresponding control method is found, which makes it conducive to the production needs, for the feed manufacturer. It is very important to say. The author will discuss this issue from the following aspects based on years of granulator design experience and on-site debugging experience. HPI 1 Granulate Machine Bible Parameters HPI the Yield of Livestock Pla Accurators is Q (kg / h), and the inner diameter of the ring-molded D (mm), the root model is W (mm), the ring mode speed is V (m / s), the ring model rotation is N (R / min), the ring die aperture is D (mm), the ring is molded The porosity rate is PSI; the number of openings is N (a), the resulting particles are not cut at the length of L (mm), the particle density is rho; (kg / m3), then calculate the unswed-off The length of the particles is: HPI service livestock HPI for the above formula, we do not difficult to analyze the factors affecting the length of granulator particles: HPI 1.1 Granulated Machine Yield HPI According to Formula, the particle length L and yield Q are proportional, and other parameters are unchanged In the case of, the higher the yield, the longer the particles, the more short particles. Therefore, in order to achieve a specific particle length requirement, the yield of adjusting the granulator is a possible choice method. In actual feed production, the feed manufacturer is also done, and someti many outputs to meet the length of the particles. This issue will also be mentioned in the discussion later. HPI 1.2 Ring Mode Speed or Speed HPI It can be seen from the formula, particle length L and ring mode velocity V or ring Both the mold rotary speed N is inversely proportional, and in the case where the supply speed is the same, the speed of the ring mold is faster, the shorter the granules of the instant extruded, the longer it. Granulator for different sizesFor the speed difference, the speed of the ring model is very large, and the small granulator speed is high, the speed of large granulator is low, but the ring mode speed is controlled in a suitable range, generally at 6 m / s ~ 9m / s It is between to accommodate the need for granulation. When the linear speed of the ring mold is small, the quality of the particles is high, but the resulting particles may be more than the requireme, and too small line speed can affect yield; when the ring mode is high, although it is conducive to production Increased, but the resulting particles may be shorter than the requireme, and the quality of the particles will be deteriorated, which requires the feed manufacturer to choose the speed of the ring mode suitable for ourselves according to different feed varieties. The method can pass Changing the transmission ratio of the granulator drive system. HPI 1.3 Ring Dimple Aperture and Open Hole Rate HPI Wheel Mold Diameter D Directly affects the particle length L, it and open The number N n is common to the length L, that is, the size of the ring type openings psi; because the opening rate PSI; the product is proportional to the sum of the squares of the ring-type aperture D and the number of openings N. The larger the annular opening rate, the shorter the particles made, the longer the particles. When the opening rate of the ring mold corresponds to a different ring mold aperture, such as a ring mold hng a ring die aperture is §æ1.8 mm, the opening ratio is about 25%, the ring mold aperture is §æ5mm, the opening rate About 38%, the greater the aperture, the higher the opening rate. In actual production, especially when producing small diameter particles, such as producing §æ1.8 mm shrimp materials, some users will complain that the particles produced are too long, because the corresponding ring mold opening rate is low because the small aperture is low. What is causing, the solution is to achieve a method of sacrificing a part of the yield, or by the above-mentioned approach to a method of improving the linear speed of the ring mode, there is also an adjustment cutter, etc. The following is discussed below. HPI 1.4 Ring Mode Inspector, Ring Effective Width and Particle Density HPI Service Animal Husband for a granulator, ring-mold inner diameter D, the root model valid width W is more fixed parameters, which generally does not change, and the user is not easy to change, so their effects are not discussed here. The density of the particles is related to the raw material of the granulation, and the compression ratio of the ring mold is related to the compression ratio, the more the particles make the particles, the larger the density, but for a general product, the density of the particles is not large. Therefore, the particle density is not a main influencing parameter, and there is no more discussion. In summary, the larger the density of the particles, the smaller the length of the particles. HPI Service Animal HPI 2 Tools Influence HPI 2.1 Cutting Sudden HPI The number of cutters is usually determined by the number of granulator pressure rollers, and the general granulator has 2 to 3 pressure rollers. Each pressure roller is correspondingly matched, if each cutter is used, the ring Each time a week, a certain amount of incoming material is extruded, the corresponding cutter is cut twice or 3 ti , so if the yield is certain, the granulator of the three cutters is more than two cutters. The particles from the machine are short, that is, the three pressure roller plate machine is more conducive to controlling the length of the particles than the two pressure rollers, and in the actual use, as in the production of small particle diameter aquatic product, Since the length is shorter, the granulator of the trip roller is usually used, and three cutters are cut. HPI 2.2 Cut Structure and Adjustment HPI is generally divided into hard blade and thin blades. The hard blade is well wear resistant, the toughness is poor, and is suitable for large-scale livestock and poultry. At the time of adjustment, the hard blade generally adjusts to the outer surface of the knife, the outer surface of the ring mode is about 5mm, and the powder will increase in the distance, and may hurt the knife, too large, the particle length is not very uniform, and long particles may occur According to the increase of the distance, the knife port is increased to the bending torque of the particles, and the particles may be broken from the surface of the ring mold. Because of its elasticity, thin blade can be adjusted to the position of the outer surface of the ring mold, which is consistent, which is particularly suitable for use in some small particles of aquatic product, such as a plasmid of a shrimp. In actual production, the adjustment of the cutter is flexible and can be used as needed, two or three cutters are cut. Alternatively, in theory, when two or three cutters are used simultaneously, the cutter must be adjusted to the distance equal to the outer surface of the ring mode, so that the particles cut are neat, but the actual situation is not As such, since the granulator is in the feed, there may be a defect on allocation, the amount of feed assigned to each pressure roller cannot be guaranteed, so that the length of the particles extruded in each extruded zone is different. However, some extruded zones are extruded, and some extruded zones are extruded, but they are substantially consistent in a squeezing zone. For this case, each cutter should be adjusted separately. The position, so that the cutter of the cutting rolls allocated at the feed amount is nearly nearly near, and the distance from the cutter of the roll of the feeding amount is far from the surface of the ring mold, in order to make the whole The length of the particles made is consistent. HPI 3 Ring Molding Face Structure HPI the common ring molding structure of the service livestock is used, straight through the cylindrical hole (Figure A ) And ladder cylindrical holes (Figure B). HPI the length of particles made from the serving livestock straight cylindrical hole is more uniform (as shown in Figure A), and the particles made from the step cylindrical hole often appear individual long particles ( As shown in Figure B), its formation mechanism is like this:The reason for the ladder cylindrical hole is because the compression needs of the actual granulation is relatively small, and the ring mold cannot be made too thin on the thickness due to strength. It can only be used to expand some holes outside the straight cylindrical hole. The method is to achieve the purpose, so that both ring compression ratio, it satisfies the strength requireme, but the consequence of such a compromise method is that the cutter is larger due to the cutting point of the particles due to the cutting point If the cutter is not sharp enough, the particles may be broken from the junction of the stepped hole, becoming more than ordinary particles, which is more obvious in the outer step hole drill. The solution is to change the feed formula, use a larger compression ratio as possible, do not use the step hole or make it as short as possible; or use a sharp cutter, and try to close the ring mode; or adjust the water moisture, make the extrusion The granular brittleness is reduced, and the texture is soft and it is not easy to break. HPI Effect of Livestock 4 Pressure Roller Out of Surface Structure HPI the structure of the external surface of the service livestock pressure roller mainly has a tooth slot, a tooth groove Type and honeycomb type. The tender-type pressure roller is well-used, in the livestock and poultry feed mill, but since the feed is slid in the tooth, the wear of the roll and the ring mold is not uniform, wear both ends of the pressure roller and the ring mold. Some serious, long-lasting, the two ends of the ring molds have been difficult, and the produced particles are shorter than the intermediate portion of the ring mold. There is a sealed tooth pressure roller for aquatic product, and it is easily slidable when the aquatic product is extruded. Since there is a feeding edge on both sides, the feed is extruded, it is not easy to slide on both sides, and the distribution of the feed is Compared, the wear of the pressure roller and the ring mold is also more uniform, so that the length of the particles produced is also consistent. The advantage of the honeycomb pressure roller is that the annular wear is uniform, and the length of the particles is also consistent, but the content of the coil performance is poor, thereby affecting the yield of the granulator, and is not as common in actual production. HPI Service Livestock 5 Granulated Screening System HPI the particles after the must be sieved, and the screening is not required. Granules, small particles and powder can obtain qualified products with uniform length. Feed Factory generally uses a rotary hierarchical screen or a screening of the granular grading screen. The grading screen is generally equipped with two-layer screen. The sieve material of the upper screen is a large length of particles or large impurities. The sieve of the lower screen is a finished material, and the sieve is less than the length. The particles and powder, therefore, how to reasonably configure the screen is the key to uniformity of the length of the finished material for an existing graded screen. If the feed manufacturer requires a high length of uniformity, more large pellets and small pellets must be removed, and the finished product obtained is small, and the refined material is much more, it depends on each production. Manufacturers go to master themselves. HPI 6 Conclusion HPI – Bit Feed, ServiceAnimal husband can be seen from the above discussion, there are many factors affecting the length of granulator particles, and each manufacturer must explore according to their own actual situation, according to different models of granulator and feed varieties, summarize a set of particle length control methods suitable for themselves..In addition, it is to be explained that many of the above factors have two-sided, and it is not possible to pay too much due to the length of the need to pursue the required length, such as production, parts and raw material costs, humanity, etc.The above is some lessons from many years of granulator design experience and on-site debugging, hoping to help feed manufacturers.HPI

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