Different livestock and poultry in different growth period, the size of the pellet feed requirements are different. For example, chicks need a smaller pellet feed. If the use of small aperture die directly to produce small pellet feed, it will make the production of low, high power consumption. Pellet crumbler is a special equipment for breaking large granule feed into small granule feed. Adopting the method of first pressing large particles and then crushing them into small particles with the pellet crumbler can increase the output and double, and can greatly reduce the power consumption, improve the production efficiency of the whole process.
The working principle of the pellet crumbler.
The working principle of a pellet crumblerr is similar to that of a flour mill. It uses a pair of rollers with different rotational speeds for relative rotation. When the particles are cooled and enter the two rollers of the pellet crumbler, the production of particles is broken by the differential motion of the two rollers and the shearing and squeezing effect of the saw-tooth groove on the particles. The required particle size can be obtained by adjusting the distance between the two rollers. If it is not necessary to break, the pellet can pass through the bypass through the valve, and at the same time touch the travel switch to make the motor power off and stop.
The main structure of pellet crumbler.
Generally, the pellet crumbler is equipped with a pair of rollers with different rotational speeds. Its main structure by the position of the fixed fast roll, can move the slow roll, rolling distance adjustment mechanism, valve and control mechanism, transmission mechanism and frame. In order to make the particles in the ground to be even more uniform, add a feeding roll to the top of the crushed grain, which is known as the three roll of granules.
The roller is the main working part of the pellet crumbler and roller body is made of bimetal centrifugal casting. The outer layer is a hard layer, which is very hard and wear-resistant. The inner layer is low-cost gray iron. Roller teeth shall be rounded by the lathe, and then processed by the wire drawing machine to form a saw-shaped tooth groove, which can be used for wire drawing repair after wear and tear, and can be reused for many times. The two rollers are divided into fast and slow rollers. The diameter and length of the two rollers are the same, but the rotation speed is different. The speed ratio between fast roller and slow roller is generally 1.5:1. The roller tooth is processed into a certain slope (generally 1:12), which can make the roller run more smoothly, and is conducive to the shear action of particles, and improve the crushing efficiency. The roller shall be installed in a "front to front" form, which increases the shear force and reduces the generation of powder during the crushing process.
There are two kinds of roller tooth shape, the large tooth shape is used to produce chicken feed, and the small tooth shape is used to produce prawn feed. There is also a matching mode of rollers, the fast rollers are processed into miter teeth, and the slow rollers are processed into V-shaped groove along the circumference direction.
A rolling distance adjusting mechanism is provided at both ends of the roll to adjust the distance between the two rollers according to the requirements of crushing particle size. The slow roll is equipped with a spring compression mechanism, if there is a hard object into the crushing zone, it can automatically increase the roll distance, after it passes through, the original rolling distance will automatically resume to continue to work and protect the roller teeth from damage. The mechanism is also provided with a limit screw to limit the position of the minimum rolling distance between the two rollers to ensure that the two rollers will not want to touch.
The transmission mechanism generally adopts triangle belt drive, the motor drives the fast roller through the triangle belt, and then the fast roller drives the slow roller through the triangle belt. Valve and control mechanism is to control the particle into the crushing area or through the bypass pipe control mechanism. Because only a small number of products need to be grated (such as chicken and shrimp), and most products do not need to be grated.
The size of the pellet crumbler is now determined by the diameter and length of the roller. Because the roll is manufactured by professional manufacturers, roller diameter: 150 mm, 200 mm, and 300 mm and other specifications. Roll length: 800mm, 1000mm, 1400mm, 1650mm and 1800mm and other specifications.
The length of roll is the main factor to determine the yield of pellet crumbler. In general, the output per unit length of roll is 79~90kg/h•cm. As the roller length is restricted by manufacturing, processing and cost, the roll length should not be too long.
When using the pellet crumbler to produce small particles, note that granulation and cooling are required to make the granules harder, longer particle length, cooler cooling time than the general production of about 10% longer particles. This will reduce the amount of powder produced when the grains are crushed. The length of the particle material is generally about 2~2.5 times the diameter. But for granular materials, a little longer length is better, because the shorter the length, the more cross section, the more place to produce powder, so the length can be controlled for the diameter of 4~5 times. In addition, the output of the pellet crumbler does not represent the output of the finished product. Because only about 80% of qualified particles can be produced in the crushing process, and 20% of unqualified small particles and powders need to be returned to the Pellet Mill. According to practical experience, three key points are summarized to ensure the yield and quality of granulated products: 1.Granule quality is better when pelleting is made (ensure granule hardness and longer length)
2.Control the generation of less powder when crushing the grain (roll front to front installation, adjust the spacing of two rollers to 2/3 grain diameter)
3.Ensure that the grading effect is good (grading screen with reasonable configuration)
