Crushing is one of the important processes in the animal chicken poultry cattle fish feed production process (reception and cleaning of raw materials, crushing, ingredients, mixing, pelleting, packaging), which not only affects the production efficiency of the subsequent processes, but also the nutrition of the product value, processing cost, animal performance and air environment are also affected. The crushing particle size, crushing output and processing cost of feed determine the choice of crushing process. The size of the crushing particle size of feed materials directly affects the crushing process and animal growth performance. Within a certain range, the smaller the crushing particle size, the more the animal's palatability and production performance can be improved. Therefore, during animal feed line manufacturing process, according to the requirements of different species or different physiological stages of the feed granularity, reasonable animal feed crushing equipment is adopted, the best crushing process is designed, and the animal chicken cattle poultry cow fish feed hammer mill crushing equipment is correctly operated to achieve the most suitable nutritional effect.
1. The importance of crushing particle size to crushing process
Feed crushing particle size is used to indicate the average particle size of feed after crushing, reflecting the crushing degree of feed. The particle size of the spherical pellet feed is its diameter. The particle size of the non-spherical pellet feed has various expression methods such as the percentage of residue on the sieve, the arithmetic average particle size method and the geometric average particle size method. The current measurement method includes two-layer sieving. Method, four-layer sieving method, eight-layer sieving method, fourteen-layer sieving method, and fourteen-layer sieving method are very accurate, but the measurement and calculation are more troublesome and the workload is heavy. Therefore, studies have shown that the four-layer sieve method can replace the fourteen-layer sieve method within the acceptable accuracy range.
In the animal feed grinding process, the crushing particle size is mainly controlled by the hammer linear velocity, the hammer screen gap, the thickness and number of the hammers, the screen diameter, the screen thickness, etc. Conversely, the difference in crushing particle size also affects how to choose parameters and equipments. Similarly, the crushing particle size determines the use and operation of a series of facilities and equipment, as well as the determination of technological processes and methods. It can be seen that determining the crushing particle size is the basis of this link, and it is the cornerstone of the whole animal chicken cattle fish feed processing flow, which plays a pivotal role. This also makes the crushing link indispensable and irreplaceable one of the main links in the animal feed line production process.
2. The influence of crushing particle size on crushing process
(1) Influence on the selection and main structure of corn hammer mill crusher for animal feed
① With the advancement and development of science and technology, animal feed crushing machines that adapt to various functions, regions and market needs have emerged. Different crushing particle sizes and different types of feed materials have different requirements for crushers, and the types of hammer mill feed grinders selected are also different.
Animal cattle chicken fish feed pulverizers are generally divided into jet mills, mechanical mills, grinding mills and ultra-low temperature mills. In the production of feed industry, mechanical mills are generally used. According to the size of feed crushing, the crusher can be divided into coarse crusher, medium crusher, micro crusher and ultrafine crusher. For aquatic fish feed with higher crushing particle size (grinding particle size <0.6), you should choose fine crusher or ultrafine fish feed crusher machine. According to the mechanical structure characteristics, it can be divided into hammer mill, disc mill, claw mill, roller mill, flattener and cake crusher. Due to its simple structure, strong adaptability and high production efficiency, the feed hammer mill is widely used, so in livestock and poultry feed production enterprises, the medium-breaking hammer mill is generally selected.
②The main structure of each type of animal feed grains hammer mill crusher is different, so in this article only the impact of crushing particle size on the structure and parameters of the hammer mill is discussed.
The hammer is the main structure of crushed materials, and the linear velocity at the end of the hammer directly affects the particle size. As early as the 1960s, experiments showed that the higher the speed of the hammer blade, the smaller the particle size. For materials with small crushing particle size and greater toughness, the best final linear velocity is 100-110m/s. The thickness and number of the hammers are also related to the crushing particle size, according to the formula: (ε—the density coefficient of the hammers; B—the width of the crushing chamber, m; D—the diameter of the rotor, m; Z—the number of hammers; δ—the thickness of each hammer , M) It can be seen that when the particle size requirement is smaller, the number of hammers is larger and the thickness is thinner, but the larger the number, the no-load energy consumption will increase and the output per kilowatt hour will be reduced.
The hammer screen gap is also related to the crushing particle size. The small gap is not easy to block the sieve holes and has a good crushing effect. Generally, the hammer screen gap for ultra-fine grinding should be 5-6mm, usually around 12-15mm.
The main classification components of the screen in the crushing process have varying degrees of impact on the crushing particle size, crushing quality and crushing effect. Nowadays, the sieves have been standardized, and different apertures have corresponding sieves thickness and opening ratio. Under the premise of sieve strength and crushing particle size, the larger the opening ratio of the sieves, the better, and the thinner the better. Once the particle size is determined, other parameters of the sieve are also determined. Aperture is the core factor. The relationship between sieve diameter and feed particle size is roughly: average particle size (mm) = (1/4 to 1/3) sieve hole diameter (mm). The geometric average particle size of the feed has a linear relationship with the sieve aperture of the same thickness, so that the geometric average particle size of different raw materials can be roughly derived, and the thickness and aperture of the sieve can be selected according to the required geometric average particle size of the feed. The ratio of the aperture of the crushed sieve to the geometric average particle size of the crushed material decreases as the aperture of the sieve decreases.
The granularity of crushing is directly or indirectly related to multiple components or working parameters of the cattle chicken feed grinding mill crusher. By understanding the relationship between them, we can better serve production, optimization of equipment and solving practical problems. The crushing particle size will affect the animal's protein digestibility, feed conversion rate, daily gain, slaughter rate and other economic indicators, and this is the fundamental reason why animal feed processing companies gain economic benefits in the industry, thus driving the economy in all directions. The development of the crusher is also benefiting from this.
(2) Impact on suction system and conveying device
Current livestock poultry feed crusher pulverizers are equipped with a reasonable suction system, which can increase the output by 10% to 30% and reduce the temperature of the pulverized material. The air volume of the superfine feed grinder machine is smaller than that of the ordinary grinder, but the wind pressure is greater than the latter. Therefore, when choosing to produce products with small crushing particle size, the air volume should be appropriately reduced, but the air pressure cannot be low, it must be high. After the raw material is crushed, the crushed material needs to be transported to the batching bin. The discharge method of the hammer mill mainly includes pneumatic conveying and mechanical conveying plus auxiliary suction (screw conveyor and elevator). The suction system of mechanical conveying makes the crushing room Negative pressure improves efficiency to a certain extent. When the particle size of the crushed product is small, choosing the pneumatic conveying system is the most appropriate way to ensure the continuous conveying of the material when the crushed particle size is small, and it is not easy to cause pollution. In general, pneumatic conveying has high energy consumption, high noise and high water loss. The fixed cost of feed is slightly higher than the latter. However, many researchers have studied the problems caused by pneumatic conveying, which provides a basis for future improvements.
(3) Influence on the crushing and batching process
The batching process and the crushing process are closely related. In the process of feed processing, two processes are derived: first crushing and then batching and first batching and crushing. The best pulverization efficiency can be obtained by the first pulverization and then the batching process, the control of the particle size is convenient, the first batching and then the pulverization process is adaptable, and a large number of batching bins are not required, which saves floor space and is beneficial to the uniformity of feed particle size. Both processing techniques have their own advantages, but if the produced product has a relatively small particle size, low grain material content, high protein content, and easy arching (such as some aquatic feeds), the first ingredient and then crushing process can be preferred.
(4) Influence on the crushing process
The process flow of the crushing stage can be divided into primary crushing and secondary crushing. The primary crushing process equipment is simple, the investment cost is low, but the power consumption is high. The secondary crushing process can make up for the shortcomings of the primary crushing, and the power consumption is reduced by more than 22%, and the output is increased by more than 25%, but the equipment investment cost is high. When producing feed with a small particle size (aquatic feed), the secondary crushing process should be selected. The materials are classified before or after crushing. Those that meet the particle size requirements will enter the next process, otherwise they will return to the grain wheat corn grinder for animal feed to continue crushing until it meets the requirements. So far. In addition, small animal chicken cattle fish feed mill plants should adopt a one-time crushing process to save investment in feed processing equipment, but in the production process, pay special attention to whether the crusher breaks the screen to ensure the pass rate. But at present, the animal feed production factory is becoming more and more large-scale, and the primary process is gradually replaced by the secondary crushing process.
In summary, the crushing particle size has a certain relationship with the entire crushing process. According to the appropriate crushing size, the corn rice husk grinder hammer mill machine for animals feed is selected and the parameters are set, and then the process flow of the crushing section and the crushing and batching section are determined. Technological process. To carry out a correct and reasonable crushing process design, it is necessary to understand the optimal crushing particle size of different physiological stages and different types of animals, combined with the characteristics of the selected chicken poultry cattle fish feed grinder machine, and design a reasonable process flow to maximize production benefits. At present, the crushing stage is still the most power-consuming and noisy part of the complete animal feed line manufacturing process. When designing the process flow of the animal chicken poultry cattle fish feed making plant and selecting the site, it is necessary to consider issues such as cost, energy consumption, and benefits, and make an environmental assessment.
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