Technical measures to improve the quality and yield of wheat flour by using flour purifier machine
Increasing market competition has forced wheat processing enterprises to try to improve the quality and yield of wheat flour. To improve the quality and yield of wheat flour, the key is to do the following two things: First, provide the best quality for the road mill. The most abundant pure endosperm granules, the second is to maximize the powder in the anterior heart grinding, to take out the good powder as soon as possible, to avoid the good material and then affect the quality and yield of high-precision wheat flour. In these two points, the first point is the premise, only the first point can be achieved to achieve the second point, otherwise it can only be difficult for a clever woman. As a special equipment for purifying endosperm granules, the powder cleaning machine has been highly valued in the field of milling. The milling workers have been constantly researching and exploring how to use the fine powder machine, especially in the past five years, with the system in China. The great development and innovation of the powder process, with the "Chinese characteristics", the advanced powder cleaning technology that uses the powder cleaner to improve the quality and yield of flour is gradually formed and improved.
1 Scientifically and rationally configure the powder cleaning system
1.1 Expanding the range of cleaning powder
The traditional wheat flour cleaning system is generally set with 4 clear flour. The clear powder range is 1P, 1B, 2B, and the large coarse grain, ie, the wheat residue. The 2P selects 1B and 2B, and the middle coarse grain is the wheat heart, 3P fine. D1 (from 1B sieve), D2 (from 2B sieve), D3 (from 3B sieve) and 1S separated small coarse particles, that is, hard coarse powder, and 4P selected 3B and 1S separated mixed coarse particles. After the powder clearing range is expanded, in addition to the above materials, the soft coarse powder separated from D1, D2, and D3, the soft and hard coarse powder separated from 1S, and the coarse, soft and hard coarse powder separated by 1M. Even the coarse powder separated by 2S is used for powder cleaning (see Figure 1 for the specific range). After the expansion of the cleaning powder range, the flow rate of the material entering the powder cleaning machine is increased, thus creating conditions for purifying more pure endosperm particles, and the pure endosperm particles purified by the powder cleaning machine in the milling process are before being fed. The road mill extracts high-quality flour, so the expansion of the powder range is beneficial to improve the quality and yield of the flour.
1.2 Refined powder cleaning system
Although the expansion of the clearing powder range can increase the flow rate of the anterior heart mill, the quality may not be completely guaranteed, and if the quality of the material of the anterior heart mill is not high, the quality and yield of the flour will be affected. Therefore, in order to make the flow rate of the material entering the eccentric heart mill large and good, it is necessary to refine the setting of the cleaning system while expanding the range of the cleaning powder, and enter the different cleaning systems according to the difference in particle size and quality. The treatment is carried out so that the material entering the powder clearing machine is more uniform in particle size and quality, and the cleaning efficiency and effect are higher. For example, the 3P system is subdivided into 3P1 and 3P2, and the 4P system is subdivided into 4P1, 4P2, 5P. The system is subdivided into 5P1, 5P2, see Figure 1.
1.3 Adopting repeated powder cleaning process
Repeated cleaning is to collect the lower sieve in the cleaning machine and even the third layer of the sieve, and send it to another powder cleaning machine for further cleaning. Because in the actual production process, the material in the rear section of the powder cleaning machine is gradually reduced, the material layer is thinner and easier to be blown through by the airflow, resulting in impure mesh, containing more pure endosperm and a certain amount of skin. The endosperm grain, if this part of the material enters the anterior heart mill grinding, it will affect the quality of the high-precision flour in the front, wheat flour processing machine but if it is repeatedly powdered, the pure endosperm and the continuous skin endosperm are completely separated, then more pure The endosperm enters the anterior heart mill, which has a reliable guarantee for improving the yield of the high-precision flour in the front. Repeated cleaning process According to the size and investment of the powder factory, 2~4 channels can be set, and the 1~4P rear section sieve and the third layer sieve material are respectively subjected to repeated powder cleaning. Generally, 2 channels can be set, as shown in Fig. 1. 1Pr, 2Pr.
1.4 Match the sifting area of the cleaning system and arrange the screen properly
Since modern milling technology expands the range of cleaning powder, it is necessary to match the screening area of the cleaning system, otherwise excessive flow will reduce the effect of cleaning. For example, 14 sets of “1000×250×2” type mills with a designed output of 250T/d are used. For example, 1P and 2P need to be equipped with 3 bins, 3P needs to be configured with 2 bins, and 4P and 5P can be configured with 1 warehouse. The configuration of the screen of the powder cleaning machine must first follow the principle that the same layer of screen is dense and thin, and the same section of the screen is densely dense. At the same time, wheat mill factory considering the effect of the updraft, the first stage of the lower layer should be significantly less dense. The machine material retains the flat sieve screen number to facilitate the perforation of the fine pure endosperm, and the finer the material, wheat milling equipment the larger the difference between the screen number of the powder cleaner and the screen size of the flat sieve; the last section of the lower layer should be rare or equal to the machine. The flat sieve screen number through which the material passes, so that the largest endosperm particles can pass through. When the material particle size is small, the sieve number can not be changed too much; wheat milling machine the middle two screens are evenly distributed according to the difference between the two screens before and after. When the difference between the numbers is small, the adjacent screens may take the same sieve number; the upper screen of the same section is thinner than the lower layer. Of course, the screen wheat mill machine price should also maintain good tension and cleaning effect.
1.5 Design the process of the powder cleaning system
The process of designing the powder cleaning system, that is, the combination of the material of the powder cleaning machine and the direction of the material after the cleaning is the key to scientifically and rationally configuring the powder cleaning system. wheat milling process
In principle, only materials with similar particle size and the same quality can be combined to clear the powder. After clearing, the direction of the material wheat milling technology
should be as fine as possible. The pure embryos in wheat flour mill plant with similar particle size enter the same grinding system, and the pure embryos with different particle sizes enter different grinding systems to improve The grinding effect ensures the quality and yield of the flour, such as dividing one heart and two hearts into thick grinding. When producing special powders, it is also necessary to combine and distribute according to the intrinsic quality of the materials to create more powder streams with different quality differences, to create conditions for the production of online powders or base powders, in order to improve the quality of different grades of special powders. Out rate. The process flow of the powder cleaning system is shown in Figure 1.
2 Cooperate with grinding and sifting
The combination of grinding and sieving is an effective supplement and guarantee for the scientific and rational allocation of the powder cleaning system, including the two meanings of the process design and production operation.
The design of the process design is mainly reflected in the following aspects: in the configuration of the contact length and technical parameters of the front middle skin grinding roller, equipped with a wider grinding roller length and a smaller front angle and slope, to increase The slag core and less powder meet the requirements of the flow and quality of the materials entering the powder cleaning machine. The technical parameters are recommended as follows: 1B, 30°/60° or 30°/65°, 4%, DD arrangement; 2B, 30 °/65°, 4%, DD arrangement; 3B, 30°/65°, 6%, DD arrangement or 50°/65°, 6%, FF arrangement; sieving screen and sieving area in the front middle road On the above, taking the length of the grading sieve, shortening the length of the powder sieve or even not sieving the powder, at the same time, appropriately increasing the sieve area and other measures, so that the separated materials have similar particle size, no powder, pure and pure, to meet the powder cleaning machine. The material needs uniform particle size and no powder requirement; in the setting of slag grinding, the emphasis is on the core making and purification function of the slag grinding. For this purpose, the 1S grinding can adopt the tooth roller, and the technical parameters of the grinding roller can be 40°/70° or 70°/70°, 6%, DD arrangement, in order to slightly peel off the wheat husk on the wheat residue by slag grinding roller to obtain relatively pure endosperm particles, so as to enter the road The number of pure endosperm particles increased by heart; in the design of slag grinding and anterior heart grinding process, the screen design is optimized, the grading of materials is strengthened, and a part of the sieved materials are re-screened and sieved to effectively solve After the sieving, the material entering the powder clearing machine should not contain powder, powder sieve and can not be sieved to prevent the contradiction of sieving; in the configuration of the contact length of the circumcision grinding roller, it should be equipped with a wide grinding roller in wheat flour mill plant manufacturer. Long, in order to maximize the pure embryonic milk particles in the anterior heart grinding and grinding into powder, avoiding good material and pushing.
The cooperation in the production operation is mainly reflected in the following aspects: in the operation of the front middle road grinding and slag grinding, it is necessary to adopt a loose rolling distance to control the stripping rate and the powder extraction rate of the anterior surface grinding mill. Less skin grinding powder, to obtain a quantity of good quality slag material to be sent to the cleaning machine for purification; in the operation of the front road heart grinding, under the premise of ensuring the quality of the flour, try to increase the powder extraction rate, Take out the powder as soon as possible to ensure the quality and yield of the flour.
3 Operating and controlling the powder cleaning machine during the production process to improve the powder cleaning effect
3.1 Control the feeding effect
Control the feeding effect so that the material is continuously and evenly distributed over the full width of the screen surface and covers the entire length of the screen surface without the phenomenon of drift or flow interruption. Otherwise, the updraft on the screen surface is unevenly distributed and the material is automatically graded. Poor formation, affecting the effect of clearing powder. In the production process, if there is a phenomenon of drift, for the commissioning of the new plant, it should be checked whether the transverse direction of the screen body is horizontal and whether the opening degree of the left and right ends of the feeding valve is consistent. For the old factory, it is important to check whether there is any feeding valve. Foreign matter is blocked; if there is a phenomenon of current interruption, it should be considered whether the flow rate is too small or the screen is too thin or the wind is too small, but if there is a small amount of interruption at the discharge end screen, it will correspond to the damper of the suction chamber. Close small.
3.2 Adjust each suction door
The suction door of each warehouse powder cleaning machine consists of one total damper, 16 monotonous dampers and two filling dampers. It is the most damper and the most complicated adjustment equipment in all equipment of the powder factory. In the adjustment of the total damper, the suction air volume should be matched with the material flow rate so that the material can form a good automatic grading on the sieve surface to ensure the powder cleaning effect; in the adjustment of the 16 monotonous dampers, due to the various sections of the sieve body The thickness of the material layer is thick and thin at the front, so the monotonic dampers of the first and second suction chambers should be fully opened to make the incoming materials quickly loose and run forward, while the other dampers gradually change from the feeding section to the discharging section. Decrease, 16 monotonous dampers should be matched with the total damper; the opening degree of the two dampers at both ends of the air duct should not be accumulated in the air duct, and it should not be opened too much, otherwise a large amount of airflow is easy to run from here. The material is reduced in flow through the screen surface.
3.3 Distributing the sieved material
In the production process, according to the quality and flow rate of the material filtered by the powder cleaning machine, especially the undersize material, the flow direction of each material can be flexibly distributed in time, and the materials are sent to different grinding points for grinding to improve the grinding effect. To ensure the quality and yield of flour.
In addition, you should also pay attention to check the operation of the cleaning brush, etc. If you find that the flow rate of one of the screens is small, you should pay attention to check whether the cleaning brush of the section is moving. In short, whether the operation and control of the powder cleaning machine in the production process is the key to whether the above technical measures can be implemented, the milling manufacturers should pay great attention to it.
4. Conclusion
The powder cleaning machine is the key equipment to improve the quality and yield of the flour. If the powder cleaning machine can be used well, it will lay a good foundation for improving the quality and yield of the flour. In order to use the powder cleaning machine, it is necessary to scientifically and rationally configure the powder cleaning system, and at the same time, cooperate with the grinding and sieving. In addition, the powder cleaning machine should be operated and controlled in the production process to purify the powder. A lot of good quality pure endosperm is sent to the front road heart mill and try to grind it into the powder in the front road