The influence of the number of rollers of the shrimp feed pelletizer machine on the pellet quality
Shrimp pellet feed is a kind of hard pellet feed in the feed industry. It has high pellet quality, multiple formula components, long process flow and high equipment requirements. It represents the highest level of hard pellet feed processing technology in the feed industry. . If any link is not handled properly, it may affect the quality of the pellets.
Among them, the shrimp feed pelletizing equipment is the key equipment for shrimp feed production plant and one of the key factors affecting pellet quality. Therefore, it is very important to choose a shrimp feed granulator with reasonable design and excellent performance. The granulator mainly includes the following parts: roller assembly, ring die, main shaft part, rotor part, machine base, transmission device, etc. According to the number of pressing rollers, there are currently two types of shrimp pelletizers on the market, one is a two-roll ring die shrimp feed pellet making machine; the other is a three-roll shrimp feed pelleting machine. There are many parts in the granulator that have a great influence on the quality of the granules, and this article will not repeat them. However, there are few literatures about the analysis of the number of rollers on the pellet quality, so the article mainly focuses on the influence of the number of rollers on the pelleting quality.
A very important indicator of pellet quality in the shrimp feed industry is the appearance quality of pellets. Usually a good appearance objectively reflects good granule quality. If the tempering temperature is not in place, the color will be whitish, the chalking rate will be high, the incision will be rough, and the starch gelatinization will be low. If the water is not uniformly added, the color of the particles will be uneven, the length will be different, the moisture of the finished product will be different, and it will be easy to mold. If the pressing rollers squeeze different materials and spread unevenly, the thickness of the material layer above the die hole in the squeezing zone will be uneven, and the squeezed feed volume and squeezing force will also be uneven, which will easily cause particles Problems such as uneven color and length. Therefore, any imperfections in the process will be directly manifested by the appearance of the particles, and it is the simplest and most feasible to judge the quality of the particles by the appearance of the particles. It has also been widely used in the feed processing industry.
To obtain a good pellet appearance, the feed distribution amount in the squeezing zone of each pressure roller must be the same. And the feed should be spread evenly in the squeezing zone, both are indispensable. First of all, from the point of view of the distribution amount, which of the two pressure rollers or the three pressure rollers is more evenly distributed? In fact, the feed distribution of the two pressure rollers is better to adjust than the three pressure rollers, and the effect after adjustment is also ideal. After the adjustment of the feed distribution in each extrusion zone is approximately equal, it is not a big success. It is also necessary to consider the uniformity of feed distribution in the axial area of the extrusion zone. The distribution surface of the same extrusion area can be roughly divided into 3 parts along the axial direction. Theoretically, as long as the thickness of the outer, middle, and inner 3 surface areas is the same, the uniform discharge can be guaranteed. Two pressing rollers and two squeezing zones have 6 areas respectively to ensure that the feed is evenly spread. In the same way, the three pressure rollers have 9 areas to ensure uniform spreading. Therefore, it is much more difficult to adjust the uniform distribution of the three pressure rollers in the axial area of the ring die than the two pressure rollers. In actual production, due to the different degrees of wear of the pressure roller and the ring die, and the influence of factors such as the support stiffness of the pressure roller, the adjustment is more difficult.
Secondly, in terms of extrusion efficiency, under the same ring die inner diameter, the roller diameter of the two-roller structure is larger than that of the three-roller structure. Under the same output, that is, the same thickness of the material layer, the wedge angle of the two pressure rollers is smaller than that of the three pressure rollers, which is conducive to the squeezing of the material in the squeezing zone, and the squeezing force produced by it is greater , The extrusion area is large, the spreading is more uniform, and the material is not easy to slide, which is more conducive to the discharge. This is similar to the big wheels and small wheels of a car going over a hurdle. The big wheels are like walking on the ground, while the small wheels may stop there. Another advantage of the two-pressure roller structure is that its speed is slower than that of three-pressure rollers, the material is pressed in for a long time, and the pressure is tight, which is more suitable for small-aperture shrimp pellets.
Ring die shrimp fish feed pellet mill machine is the main feed processing equipment for shrimp feed processing, and it has a great impact on pellet quality. Therefore, choosing a suitable pellet machine for shrimp feed is a prerequisite for producing high-quality pellet feed. At present, there are mainly two types of granulators used in the market: two rollers and three rollers. The main problem reflected by the market is the unstable quality of the granules, such as uneven length, high powdering rate, different color and poor water resistance, etc.
This article mainly selects the number of press rollers of the granulator to analyze and draw the following conclusions: two The press roll granulator has more uniform material distribution, larger squeezing force and squeezing area, and stronger anti-slip performance. Compared with a three-roller granulator, it is more suitable for the production of shrimp pellet feed. In recent years, Richi Machinery,a professional China animal feed pellet mill manufacturer, has helped many shrimp feed production users in the market to change the three-roller structure to two-roller structure, and is equipped with a specially designed splitting scraper mechanism. The splitting is more uniform and the adjustment is more convenient. The core components of the machine have solved this problem that has plagued the industry for many years, and achieved good results, which further confirms the practicability and reliability of this research conclusion.
(1)Parameters of automatic fish shrimp feed pelletizer machine
Type SZLH558 SZLH678 SZLH768 SZLH858
Main power(kW) 90/110 110/132 132/160 160/180
Production capacity(t/h) 0.8-3 1.5-4 2-5 3-7
China factory price of CE high quality aquatic feed machine for shrimp pellet is usually between 8000USD-130000USD.
(3)Advantages of shrimp feed pellet processing machine
①High output and long service time
•Produce both sinking and floating shrimp feed.
•Service time of the die with hole diameter Ø1.8mm is up to 8500t, with continuous production of 2500h and output of over 4.5t.
②High-quality shrimp feed
•Double-layer jacket insulation conditioner and double-shaft differential conditioner.
•Optional hygienic conditioner, better maturing performance.
•The reverse opening structure and improved cutter make the cutting more convenient and improve the quality of feed incision.
③Advanced structure and smooth operation
•Equipped with pneumatic external discharging structure, realize automatic external discharging when it is blocked or overloading of the main motor current.
•The improved feeding scraper divides material into two pressing areas, ensuring smooth discharging and stable operation.