About five years ago, a large number of quality assurance devices began to appear on the market. Now a certain number of quality assurance devices are used in the market. In the process of being used, our industry is swarming in imitating, manufacturing, and promoting them in the market. Various grades, There are various types of quality protectors with various structures. I did a relatively detailed survey on the quality protector. I also conducted some experiments and observations on the application of the quality protector. I found that there are too many problems in the quality protector. I feel that our industry is still quite impetuous, and I will join you when I see you, but what are the benefits of joining the quality assurance device? The good thing? I see that many manufacturers do not use the quality protector properly and do not regard it as a very effective device that plays an effective role. Next, I will introduce the quality protector. feed preserver 
1. The main function of the preserver in feed processing and production:
① It can effectively increase the conditioning time of the material, make the starch in the material more fully gelatinized, and promote protein denaturation;
② It can reduce the content of harmful ingredients such as harmful bacteria, molds and yeasts, and improve the quality of feed;
③From a production perspective, it can be clearly felt that the addition of preservers can effectively improve the quality of feed. Especially in the color, cut and water stability of the material, it is very obvious;
④The conditioning effect is better, which can increase the adjustment space of the formula and appropriately reduce the formula cost. More starch may need to be added to the original formula to achieve better stability in water and better cutting, but with a preserver, the starch content or other animal proteins in the formula can be appropriately reduced. I think this is very effective, and it is also very important to help control the cost of formulas.
⑤The material is softer, which is beneficial to increasing output and saving production costs. Because of the preservation device, the current of the granulating host can be reduced after the material becomes softer. After the reduction, the output can be increased under the rated power. Increasing the output is equivalent to saving production costs.
2. Introduction to quality assurance devices
We see many quality assurance devices on the market, which are really diverse.
In terms of model specifications, the most commonly used ones are ￠800x3000 in diameter, and ￠800x3500. I have seen that the larger ones are ￠1000x3500, and ￠1000x3500. Most of the specifications on the market are dominated by these specifications.
Structural form:
From the appearance, there are 6 ways of thermal insulation, ① Heating through steam jacket, direct heating and insulation. ② The steam is partially heated, for example, the cylinder is heated by steam, but the door is not heated, so it is semi-insulated; ③ The entire shell is insulated using insulation cotton ; ④ Electric heating insulation, ⑤ "naked", no insulation at all. ⑥Use steam bypass pipe to keep warm. I think it is worth exploring what the advantages and disadvantages of these six insulation structures are during their use. The internal structure of
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is also diverse. Most of the internal structure designs are like an auger with a fan-shaped hole in the middle to allow the material to flow back. Some of the positions of the discharge port use a squirrel cage structure, and the squirrel cage structure is also Some are big and some are small, some are long and some are short. The manufacturing methods are also different. Some manufacturers make it into a broken structure. No matter which structure it is, the pitch is basically the same and there is not much difference. It’s hard to describe in words, so just look at the pictures.
3. Several major disadvantages and troubles that are likely to occur during the use of the quality protector
① The cutting is unstable, causing the host current to fluctuate greatly, especially in terms of process design and equipment matching. If at least one layer of conditioner is not installed under the quality preserver, whether the quality preserver is used on an extruder or a granulator , it will easily cause large fluctuations in the host machine. This is mainly caused by the internal structure of the quality preserver itself, and the size of the fluctuations will depend on the The design of the manufacturer has something to do with it. If some manufacturers do a better job, this will not be so obvious. Of course, it will be more or less.
② The filling coefficient of the quality retainer is not properly controlled. Many manufacturers buy quality protectors saying that they will improve the tempering effect, increase production, and improve the physical appearance of the product. However, in fact, if the quality protector is not used properly, it will become a big winch. Dragon only prolongs the conditioning time of the material, but it is not used properly in the process of actual quality preservation. Especially when the filling coefficient is relatively low, it will cause a steam short circuit. Since the filling coefficient of the quality maintainer is too low, the steam added in the upper conditioner will flow upward along the space where there is space, so that it can easily enter the granulator or extruder directly; the blades of the quality maintainer face one direction. Rotation, when pushing materials, most of the materials climb and tilt to one side. When the filling coefficient is low, some materials even never touch the barrel wall at all. If designed according to this structure and the filling coefficient is relatively low, Steam can easily escape into the extruder or granulator through the retainer.
③ The operation control is unstable and there are piles of scraps. The volume of the ￠800x3000 preserver is about 1.5m3. If calculated according to the 80% filling factor, one layer can store 880kg of dry powder material; the volume of ￠1000x3500 is about 2.7m3. According to the 80% filling factor, it can hold 1100kg of dry powder material; here The retention capacity is so large, and the water is not included, so after adding steam, the weight will exceed this. If there are two units of ￠800x3000, there will be 1.6 tons in it, and the moisture may be 1.8-2.0 tons. If it is one unit of ￠1000x3500, there will be more than a ton in it. With so much material, if you don’t control the temperature properly, the steam will be added. Too much, too high moisture will cause the ring mold to slip and prevent normal granulation. If too little is added, the effect will not be achieved, especially if we add too much, the material cannot be granulated, so the material must pass through the granulator. Drilling out all the bypasses will result in piles of waste materials and repetitive production, which will greatly increase the operator's labor intensity and production costs. This is an important drawback and trouble in the production process.
4. What factors need to be considered for reasonable selection?
Many users often see others using it and then I use it too. They buy a shelf life protector, but do not consider its structure. Where are the most suitable places to use the quality protectors with so many structural forms? When purchasing, we should not position based on price, but rather based on what value the product can bring to us. When choosing a preserver, we consider the following factors:
① Depends on the use: whether it is used in shrimp feed, fish feed, livestock and poultry feed, puffed fish feed, puffed shrimp feed, or other places. What is the output, whether it is large or small, should it be equipped with 1 layer or 2 layers (for example, 2 layers are used for shrimp feed and fish feed, and only 1 layer is used for livestock and poultry and puffed feed). The properties of the material require What purpose can be achieved and what problems can be solved should be considered first.
②You must consider the region, whether it is the south or the north. If you live in the north, should you consider a preservative with better thermal insulation effect? In the south, where the temperature is relatively high, you can choose a relatively simple insulated insulator. Some people even use insulators with no insulation at all.
What are the disadvantages caused by poor insulation or no insulation? It's just that after adding the preserver, the brewing temperature cannot be raised, and the material easily slips. What's the reason? This has a lot to do with thermal insulation. If the insulation effect is not good when using insulators in Henan, Hebei, and North China, the heat in a large amount of materials will be taken away by the insulator during the production process. Think about a ￠800x3000 The preserver is treated as a large piece of cold iron plate. When the hot steam enters the preserver and hits the cold steel iron plate, it will immediately produce condensation water. The moisture content of the natural material will be relatively high. It will cause the temperature to not rise, and the moisture will rise, causing the ring mold to slip. This is a very important problem.
③Consider the process configuration. If it is used for shrimp feed and puffed feed, I recommend at least 1 or 2 layers of preservers. If the preserver is directly connected to the granulator, it will be difficult to avoid no matter how the preserver is made. Fluctuations in current.The problem of current fluctuation is difficult to solve. We can slow down the fluctuation by adding a conditioner or two conditioners under the conditioner. At the same time, we can also reduce the fluctuation of the material by adjusting the structure arrangement of the paddles in the conditioner. Thereby reducing current fluctuations.
I do not recommend adding steam directly into the preserver, because it is difficult to heat evenly if steam is added. The material underneath the preserver is relatively heavy. Although there is a small range of tumbling, the steam contact is uneven after all. Because the modulator rotates relatively quickly, it can throw the material up and make the contact more even. However, the speed of the preserver is generally low, so I do not recommend adding steam to the preserver.
There should be a modulator on the preserver. This modulator can add steam or a point where moisture can be added appropriately, but try not to add steam inside the preserver.
④Consider the size of the space and which specifications to choose. For example, what should I do if the height is not enough? What should we do if we cannot fit two layers of ￠800x3000? We can also consider choosing one layer with a diameter of ￠1000x3500. We have calculated the difference in volume between the two layers of ￠1000x3500 and ￠800x3000. The difference is actually not big. The volume of the two layers of ￠800x3000 is 3 m3, while the volume of ￠1000x3500 is 3 m3. The volume is 2.7m3, and the difference between 2.7 and 3 is only 0.3 m3, so don’t underestimate the volume with a diameter of ￠1000x3500. It is close to the 2-layer ￠800x3000 quality assurance device. The investment cost can be reduced a little, and it can also solve the problem of small space. question.
⑤Consider the price. Consider the manufacturing quality and price of the product. Of course, the manufacturing quality of the product is important and will definitely be taken into consideration. The price can also be considered, but I think the most important thing when choosing a quality protector and other equipment is what value it can bring to us. We must position by value, not by price. If we position by price, our losses will often exceed the price of the equipment due to the defects of a certain equipment. Procurement and production management must have this thinking, and it must be Equipment serves production. To achieve our purpose and the value it achieves, it must be positioned by value, not price.
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