Effectively improve the output of the ring mold, in addition to the quality of the ring mold itself, the correct operation and maintenance can effectively improve the life of the ring mold. Please read carefully to make the best use of the ring mold.

1, the particle machine for regular maintenance

1. Due to the grain machine main machine feed mills, the first manufacturer to cope with the host to carry on the daily maintenance work, Zhou Bao, month, in order to ensure smooth particles machine keep good, don't beat working condition, if equipment is fault or some wearing parts wear, especially the driving wheel and spindle wear and should be replaced timely maintenance spare parts, to ensure the normal use of concentric ring mould.

2. Install iron absorption device at the feed inlet to prevent metal objects from falling into the granulation chamber, causing serious damage to the ring mold and cracking.

3. When installing the ring mold, check the wear of the transmission key, hoop, wear-resisting liner ring of the transmission wheel, wear-resisting liner at both ends of the pressure roller, gap adjusting wheel, feeding scraper, cutter and other vulnerable parts in the granulator room, and replace them in time to ensure the normal operation of the granulator. If the hoop wear can not be held tightly will produce particle machine vibration intensified, which seriously affects the service life of the ring mold, or even ring mold cracking, should be replaced in a timely manner, in addition to the feed scraper wear will produce particle machine output decline.

Two, ring mold work maintenance

1. Because of the different varieties of the production of feed, involving ring die material, opening rate, inner cone hole, effective length of die hole, pressure relief hole design is different, should find a professional advanced technology production enterprise combining feed ingredients and the actual use of different technological ring die design, customization, to ensure that ring the use of the modulus maximum value.

2. When using the new ring mold of prawn feed, the new pressure roller processed by concentric grinding must be replaced to match it.

3. The gap between the pressure roller and the ring mold must be controlled between 0.1-0.3mm, do not let eccentric pressure roller contact the ring mold surface or side clearance is too large, this is the size of the naked eye and installation is not easy to detect, so as not to cause ring mold and the pressure roller wear or no material phenomenon.

4. When the granule machine starts, the feeding amount must be from low speed to high speed, do not start at high speed, resulting in damage to the ring mold and granule machine due to sudden overload or ring mold blocking material.

Three, ring mold maintenance

1. When the ring mold is not used for a period of time, the original feed should be extruded with non-corrosive oil, otherwise, the heat of the ring mold will dry and harden the original feed left in the mold hole, resulting in the following situations:

(1) at the beginning of operation, the die hole is blocked and the material cannot be extruded;

(2) ring mold cracking may occur when the ring mold is subjected to high stress and its strength is weakened at the beginning of production;

(3) some die holes are blocked, and the output and benefit are reduced.

2. After the ring mold is used for a period of time, check whether there is a local convex part in the table of ring mold. If there is such a phenomenon, the convex part should be removed by a polishing machine to ensure the output of ring mold and the service life of the pressure roller.

3. If the mold hole can not be blocked out of the material, can use oil immersion or oil cooking after re-granulation, still can not granulation can be used to drill out of the plugging material with an electric drill, and then use the oil material with fine sand after grinding and polishing.

4. When loading and unloading ring die, the ring die surface shall not be beaten by hammer and other hard steel tools.

5. Record the use of ring mold in each shift, so as to accurately calculate the actual service life of ring mold.

6. The ring mold must be stored in a dry and clean place. If it is stored in a damp place, the mold hole will be corroded and the service life of the ring mold will be reduced or the material will not be discharged.

Iv. Cause analysis and improvement method of abnormal particles

Feed production units in the production of feed often appear abnormal granule, affect the appearance and internal quality of granule, thus affecting the feed factory sales and reputation. The following reasons are analyzed for the abnormal particle situation frequently occurring in feed mills and the list of Suggestions for improvement is explained:

Summary of granulation technology for different materials

As pellet feed in livestock and poultry and aquatic breeding industry and compound fertilizer, hops, chrysanthemum, sawdust, peanut shell, popularization and application of emerging industries such as cottonseed meal, use the ring die granulator unit more and more, because of the difference of the feed formulation, as well as the regional differences, users are different to the requirement of pellet feed. Each feed manufacturers for the production of grain feed are required to have the good grain quality and the highest granulating efficiency, because of the different feed formula, made to suppress these pellet feed on the parameters of ring also each are not identical, the choice of ring die parameters is mainly manifested in the material, aperture, aperture, length to diameter ratio, the choice of the opening rate. However, the selection of ring-mode parameters must be determined according to the chemical composition and physical properties of various raw materials that make up the feed formula. The chemical composition of raw materials mainly includes protein, starch, fat, cellulose and so on. The physical properties of raw materials mainly include grain size, water content, capacity and so on.

Livestock and poultry feed mainly contains wheat and corn, starch content is higher and fiber content is less, is a high starch feed, the pressure of this kind of feed must ensure starch gelatinization, high temperature and treatment conditions, ring mold thickness is generally thicker, wide aperture range, the ratio of length to diameter is generally between 1:8-1:10. However, broiler chickens and ducks are high-energy feedstuffs with high fat content and easy granulation. Generally, their length and diameter are relatively large, ranging from 1:10 to 1:13.

Aquatic materials mainly include fish feed, shrimp feed, turtle feed, etc., the content of crude fiber in fish feed is relatively high, the content of crude fiber in shrimp feed, turtle feed is relatively low and the content of protein is relatively high, which belongs to high-protein feed. Aquatic material requires long stabilization time, consistent diameter and neat length of particles in water, which requires fine particle size and high degree of maturation when the material is granulated, and the process of pre-maturation and post-maturation is adopted. As for fish feed, the hole diameter of hoop mold is generally in the range of replasticity 1.5 to replasticity 3.5, and the length-diameter ratio is generally in the range of 1:10 to 1:12. As for shrimp feed, the hoop mold hole size ranges from being reared 1.5 to being reared 2.5, and the length-diameter ratio ranges from 1:11 to 1:20. As for the turtle stock, its hoop mold aperture is larger and ranges from re15 to re15. Because of its higher protein content, its length-diameter ratio ranges from 1:12 to 1:20. The specific length-diameter ratio parameters must be selected according to the nutrition indexes in the formula and the requirements of users. At the same time, the design of die hole shape should not use stepped hole as far as possible under the condition of strength permitting, so as to ensure that the length and diameter of cut particles are neat and consistent.

In the compound fertilizer formula mainly has the inorganic fertilizer, the organic fertilizer, the mineral and so on composition, the compound fertilizer in the inorganic fertilizer such as urea to the circular mold corrosion is bigger, but the mineral to the circular mold hole and the inner cone hole abrasion is severe, the extrusion pressure is big. The hole diameter of the circular mold of compound fertilizer is generally larger and ranges from 3 to 6. As the larger mold hole of friction coefficient is difficult to be redistributed, the diameter is smaller, generally between 1:4 and 1:6. At the same time, as the compound fertilizer contains bacteria species, the temperature cannot exceed 50-60 degrees, otherwise, it is easy to kill bacteria seedlings. Therefore, the compound fertilizer requirements pelleting temperature is lower, the general ring mold wall thickness is thinner. Due to the compound fertilizer on the ring mold hole wear, on the hole diameter requirements are not too strict, generally ring mold used to the pressure roller gap can not be adjusted before scrap, so the ladder hole length to ensure the length-to-diameter ratio, improve the ring mold final service life.

Hops has a high content of coarse fiber dimension and bacterial species, and the temperature generally cannot exceed 50 degrees, so the ring mold wall of the pressed hops is thinner and has a shorter diameter, generally around 1:5, and the particles have a larger diameter, which is in between re15 and re6.

Chrysanthemum, peanut shells, cottonseed meal, sawdust contains a large number of coarse cellulosic, crude cellulosic content over 20%, oil content is less, the material through the die hole of friction resistance is bigger, granulating performance is poor, ask the low hardness of particles at the same time, generally can shape is difficult to meet the requirements, and the diameter of particles, generally in theta 6-8 between theta, length to diameter ratio is commonly 1:4 - around 1:6. As the bulk density of this kind of feed is small and the diameter of the mold hole is large, the outer circle of the mold hole area must be sealed with adhesive tape before granulation, so that the material can be fully filled into the mold hole before forming, and then the adhesive tape can be torn open.

For the granulation of all kinds of materials, the dogma can not be dead, must be based on the material characteristics and the specific characteristics of the feed manufacturers to choose the right ring mold parameters and operating conditions, according to local conditions, in order to produce high-quality feed.

Analysis of reasons for mold breaking (mold breaking occurs when continuous casting billet is selected by general small enterprises) :

1. Wear of mating surface of transmission wheel causes cracking of ring mold;

2, pressure die bushing wear or deformation caused by ring mold cracking.

3, transmission key wear and tear and lead to ring mold impact cracking.

4, the effect of the iron removal device changes so that the ring mold working face has metal objects indentation, and lead to ring mold cracking.

5, ring mold, pressure roll clearance is too small, resulting in ring mold cracking.

6, short compression ratio small aperture fish mold, the user requires no pressure relief hole, resulting in ring mold cracking.