Tips Affecting the Feed Mixing Machine

The main factors affecting the mixing uniformity of compound feed are: the mixer, the main physical properties of the material to be mixed, the filling amount of the mixer, the mixing time and the specific operating conditions.

 

1. The influence of mixer on mixing

In general, the mixer performance:

1. High mixing uniformity, no dead angle, less material residue;

2. The mixing time is short, the production efficiency is high, and it is matched with the whole unit (including connection and power matching);

3. The structure is simple and sturdy, the door switch is flexible, the operation is convenient, and it is convenient for testing, sampling and cleaning;

4. With suitable power matching, it can work normally under full load;

5. On the premise of ensuring the mixing quality, the energy consumption is low.

 

The models of mixers can be divided into many types according to different classification methods, mainly including horizontal, vertical, horizontal paddle, drum, left and right, planetary, rotating container, V, double cone, etc. There are two types of intermittent working type (batch type) and continuous working type. The product manufacturing level of different mixer manufacturers will definitely have advantages and disadvantages. When purchasing a mixer, you should choose a mixer with a higher manufacturing level according to your own production needs.

 

Different types of mixers have different mixing methods, and practice has proved that some mixing objects (materials) have the best mixing effect in a certain way, so it should be achieved according to different mixing objects and the mixing goals required by the producer itself ( effect) to choose different types of mixers.

 

It is difficult for the paddle mixer to mix the powder evenly, but when the feed needs to be added with molasses, and the addition amount is as high as 30%-40%, it is quite suitable to use this mixer for mixing; while the double cone The V-type mixer and the V-type mixer are more suitable for mixing materials with good fluidity and poor fluidity, respectively. If the particle size (thickness) between the mixed materials is close, a vertical mixer should be used, and when the particle size difference between the mixed materials is large, a horizontal mixer (and a rotary container mixer cannot be used) should be used; if If the residual amount is less, a horizontal or rotating container mixer should be used.

 

In addition, if the mixing requirements are high, the rotary container mixer should be used, but its production capacity is generally low; while the mixing effect is generally required, vertical, horizontal or continuous mixers can be used. production capacity is relatively high.

 

The level of mixing efficiency, the length of mixing time, and the speed of mixing are mainly determined by the model of the mixer and the manufacturing accuracy of the equipment itself. Generally speaking, the time required for uniform mixing in a horizontal mixer is relatively short, while that in a vertical mixer is longer. Of course, the length of the mixing time also depends on other factors such as the type of raw materials and their physical properties.

 

2. The influence of the main physical properties of the mixed materials on the mixing

The closer the main physical properties of the mixed materials, the smaller the separation tendency, the easier it is to be mixed uniformly, the better the mixing effect, and the shorter the time required to achieve uniform mixing. Physical properties mainly include particle size, shape, bulk density, surface roughness, flow characteristics, adhesion, moisture content, fat content, pH, etc. of the material. The material particles with high moisture content are easy to agglomerate or form agglomerates, and it is not easy to disperse uniformly, and the mixing effect is not satisfactory. Without affecting the required effect of the formula, if necessary, an appropriate amount of silica, precipitated calcium carbonate, etc. can be added, which is beneficial to improve the mixing effect.

 

Some additives in the feed need to be premixed with a carrier (or diluent) before being added to the mixer to make an additive premix, and then added to the mixer in a certain order to mix with other components. The particle size of the additives that need to be diluted is generally finer, so a carrier with a particle size and density close to it should be selected. Suitable carriers include commonly used feed ingredients, such as soybeans, wheat bran, defatted rice bran, etc. Generally, materials with fine particle size, no dust, and affinity for the active ingredients in the additive are selected as diluents (or carriers), which are suitable. The choice of neutral materials is conducive to maintaining the stability of vitamins and other active components.

 

3. The influence of the filling amount of the mixer on the mixing

The mixer mainly relies on three mixing methods of convection mixing, diffusion mixing and shear mixing to make the material move in the machine to achieve the purpose of mixing the material evenly. Important prerequisites for obtaining the desired effect. If the material is loaded too much, the mixer will be overloaded, and more importantly, the excessive amount of material will affect the circulation process of the material in the machine, resulting in a decrease in the mixing quality; if the material is too small, it will not be sufficient The efficiency of the mixer is used, energy is wasted, and it is not conducive to the flow of materials in the mixer, which affects the mixing quality.

 

Various types of feed mixers have their own reasonable filling coefficients. Their respective reasonable filling coefficients have been obtained in the laboratory and practice. Among them, the batch (intermittent) horizontal ribbon mixer has its filling coefficient Generally, 0.6-0.8 is appropriate, and the highest material position should not exceed the plane of the top of the rotor; the filling coefficient of batch vertical screw mixers is generally controlled at about 0.6-0.85; drum mixers are about 0.4; planetary mixers It is about 0.4-0.5; the rotary container mixer is about 0.3-0.5; the V-type mixer is about 0.1-0.3; the double-cone mixer is about 0.5-0.6. The filling coefficient of various continuous mixers is not the same, generally controlled at about 0.25-0.5, not more than 0.5.

 

4. Appropriate mixing time

In most compound feed production lines, the most commonly used mixers are basically batch type, and for batch type (batch type) mixers, there is also a problem of optimal mixing time. If the mixing time is too short, the material will be discharged without being fully mixed in the mixer, and the mixing quality will definitely not be guaranteed. However, it is not that the longer the mixing time, the better the mixing effect. Experiments have shown that any material with good fluidity and uneven particle size has a tendency to separate. If the mixing time is too long, the material will be excessively mixed in the mixer. It will cause separation, which also affects quality and increases energy consumption. Because in the mixing process of materials, mixing and separation are carried out at the same time. Once the mixing and separation reach a certain equilibrium state, the degree of mixing is already determined. Even if the mixing continues, the mixing effect cannot be improved. resulting in separation. The mixing time should be determined according to the combination of factors such as the model of the mixer and its manufacturing level, the physical properties of the material and the actual test results, which is not the same concept as the length of time required for the simple model itself. The mixer is used for a period of time, and various parameters may change, so it is necessary to check and test regularly, and adjust the time required for mixing correctly according to the inspection results.

5. Correct operation

For the production of additive premix, the stirring method should be gradually expanded from micro-mixing to small-volume mixing to medium-volume mixing and then to large-volume mixing. The correct order of adding materials should be: the components with large proportions are added first or most of them are added to the machine, and then a small amount and a small amount of components are added on top of it; among various materials, generally the components with large particle size are added. Add the mixer first, and then add the small particle size; when the specific gravity difference between the materials is large, generally add the material with a small specific gravity first, and then add the material with a large specific gravity.

 

For fixed container mixers, the mixer should be started first and then added to prevent the phenomenon of full load start-up, and it should be stopped after unloading; while the rotary container mixer should be started after feeding, first stopped, and then unloaded. For the V-type mixer, the materials should be fed from two feed ports respectively. Measures should be taken to minimize the influence of other factors on the mixing uniformity of the completed mixed materials: the mixed materials should be pressed into granules immediately, so that the various components of the materials can be fixed in the granules or directly packed in bags; avoid or minimize The transportation and drop of the mixed materials; the loading and unloading work after mixing should be minimized; the falling, rolling or sliding of the materials should be minimized; the storage bin after mixing should be as small as possible, and the conveying equipment after mixing should preferably be Belt conveyors.

 

In order to ensure the mixing quality, the running performance of the mixer should be checked regularly, lubricating oil is often added to the bearings and the joints of each movable shaft, and the wear parts should be repaired and replaced in time, and the optimal mixing time should be correctly determined according to the sampling inspection results of uniformity. Regularly check the operation of each switch, clean the sundries in the machine, remove the residual materials around the door switch, make the door switch flexible, and prevent the phenomenon of material leakage.

The mixer machine is important in the production line, and you can also go to see the feed drying machine .

Grinding screen on capacity of crusher and improvement measures

 1. Hole arrangement

The arrangement of sieve holes includes horizontal and vertical holes, both of which are equilateral triangles. The screen with horizontal holes is that the direction of material running is perpendicular to one side of the triangle. The vertical hole is that the running direction of the material is parallel to one side of the triangle. When selecting a screen with a large aperture (aperture>Φ4.0), the way of arranging the holes has no effect on the production capacity. Due to the high production capacity and the impact of the material on the screen, it is easy to choose a screen with vertical holes.

 

The vertical interval between the two holes just forms a strong support for the screen. When selecting a screen with a small aperture (aperture ≤Φ4.0), the decrease in the overall production capacity of the material also reduces the impact force on the screen. Therefore, a horizontal row of holes with no material incident blind area should be used. Practice has proved that when using small-diameter sieves, under the condition of the same opening ratio and the same thickness, the production capacity of the sieves with horizontal holes is 5%-10% higher than that of the sieves with vertical holes.　　

 

2. Sieve aperture ratio

When selecting sieves, give priority to meeting the requirements of product particle size, and then select sieves with high density and large aperture as much as possible according to the strength that the sieves can withstand. The relationship between the sieve hole diameter and the crushing particle size is generally: the strength of the finished product ≈ (1/4-1∕3) the sieve hole diameter. At the request of Liuhe Xinlong, we have achieved an opening rate of 45% for the Φ2.0 screen. The problem is that the opening ratio of the screen is increased, and the powder output efficiency is also improved, but the impact value of the screen is decreased. The cleaning of raw materials cannot be absolutely clean, and some larger sand and gravel can easily break the sieve, resulting in return material, which increases the production cost.

 

After several tests, on the basis of ensuring the original 42% high opening rate, the aperture on the back side of the screen was increased while the aperture on the front side of the screen remained unchanged. A kind of guide hole similar to ring die is formed. Use with the burr side facing the rotor. Because in the direction of the material flow, when the material passes through the screen hole, it collides with the edges and corners of the burr surface, which can play the role of friction and crushing, and can increase the screening capacity. At this time, the bell mouth increases the material feeding inclination, which just plays a role similar to the material guide hole of the ring die, and the crushing efficiency is significantly improved compared with the original screen.

 

3.Installation of screen

When the sieve is installed, the sieve with the required aperture of the material particle size is installed on the front side, and the sieve with a larger size is installed on the back side, which can not only meet the particle size requirements of the material but also improve the crushing efficiency. When the sieve is punched, microscopic dents will be formed on the positive side, the circumference of the sieve hole will become smooth and dull, and the cutting ratio will decrease. If the screen is installed with the anti-burr facing outward, it will also cause the material hanging at the burr to block the screen hole, which will affect the powder output efficiency.

 

4. Failure of the screen

Most of the damage to the screen is caused by foreign objects entering the crushing chamber. Small holes can be reused after repairing by welding. When there are many holes, the effective screen area of the repaired screen is greatly reduced, and then repaired. Use will lose the use value, only to replace the new screen.

 

When comet craters appear in the sieve hole, the cutting speed will be slower than that of dropping the powder. Even if there is no foreign matter, the sieve should be replaced. If it is used again, the wasted power consumption will far exceed the residual value of the sieve.。

 

5. Influence of temperature rise on production capacity during pulverization

The front-line employees who know crushing may have encountered such a phenomenon. When the crusher first started to work, the crushing speed was very fast. After working for one or two hours, the crushing speed has a slow downward trend. This phenomenon is more obvious especially when making small-aperture sieves for pig feed and fish feed. After the crusher is reversed, the production capacity returns to a state of high production capacity. That is because, after the pulverizer works for a period of time, the heat generated by the hammer hitting the material and the heat generated by the friction of the material colliding with the screen will cause the temperature of the pulverizing chamber to rise.

 

When the sieve is in such a harsh environment for a long time, the fatigue strength, surface hardness and cutting force decrease, which directly leads to a decrease in the powder yield. It is best to stop feeding at this point and let the grinder run idly for a few minutes. In a few minutes, under the action of negative pressure, the temperature of the crushing chamber can be lowered and the production capacity can be restored.

So you can see the feed crusher machine in LIMA.

Performance of poultry poisoning caused by excessive heavy metals

 The heavy metal elements polluting animal-derived feed products mainly include lead, arsenic, cadmium, chromium and mercury. Bone meal and meat and bone meal may often contain a large amount of lead, arsenic, cadmium and other elements; feather meal and leather protein meal may contain a large amount of lead and arsenic, in addition, leather protein meal often contains a high amount of chromium; fish meal and other aquatic products In addition to a large amount of lead, arsenic, cadmium and chromium, the organism may also contain a large amount of mercury.

1 Fluorine

Bone meal, meat and bone meal and other animal-derived feed products may contain a large amount of fluorine to varying degrees due to different origins and raw materials. Animals raised in natural fluorine-rich areas and industrial fluorine-contaminated areas can accumulate a large amount of fluorine in their bones. Products made from such animal raw materials must contain high fluorine content. Long-term and large-scale use of such products can cause chronic chronic diseases in livestock and poultry. So you can use the floating fish feed machine.

      2 nitrite

      According to foreign reports, sodium nitrite has been used as a preservative in the production of fishmeal. If the amount is too large, it can lead to nitrous acid poisoning in feeding animals, which may be transformed into dimethylnitrosamine, a carcinogen. Ji Zhenyang (2005), He Jin (2006) and other relevant experts reported that when toxic elements exceed the standard, there are the following toxic manifestations.

3 Chrome

① Combines with nucleic acid and nucleoprotein in animals, affecting the phosphorus content in tissues; ② Reduces the activity of amylase and prevents cysteinase oxidation; ③ Impairs the function of red blood cells to carry oxygen, causing lung cancer, especially lysis Chromium compounds, which are acid insoluble in water, are more dangerous.

4 Cadmium

①Reduce the weight gain and feed conversion rate of broilers; ②Cause anemia in pigs, cause sheep anemia and renal dysfunction; ③Cause sperm inactivation in male animals; , Humoral immunity has inhibitory effect, reducing animal immunity.

5 Arsenic

①Combined with the sulfur group of pyruvate oxidase, making the enzyme inactive, affecting the normal metabolism of cells, leading to cell death; ②Harming nerve cells, causing polyneuritis and central neurasthenia, paralyzing capillaries, and causing tissue nutritional disorders; ③ The International Agency for Research on Cancer announced that arsenic is a carcinogenic factor; ④ acute arsenic poisoning can make animals die in a short time;

6 lead

①In the early stage, the excitation and inhibition process of the cerebral cortex can be mildly disturbed, and in the later stage, serious disorder occurs, causing the dysfunction of the sympathetic and parasympathetic nervous systems; ②Interfering with hemoglobin synthesis; ③Causing intestinal paroxysmal spasm or paralysis; ④Causing interstitial nephritis , Kidney atrophy, reducing animal immunity; ⑤ It can enter the lactating young animals through milk, causing harmful effects; ⑥ It can enter the fetus through the placenta and endanger the fetus.

7 Fluorine

①Causes the reduction of egg production of poultry, the fertilization rate and hatching rate of breeding eggs; ②Causes the decline of immunity of farmed animals; Inhibits the activity of oxidase and dehydrogenase, affects metabolism, and causes animal weight loss and anemia; ③Causes bone nutrition Bad, skeletal fluorosis, joint stiffness, tooth coloring, enamel damage; ④ cause cardiovascular disease, gastric cancer, lung cancer, and even death.

Welcome to see LIMA Machinery.