Brief Introduction of Feed Machinery

The granulating principle of the ring die granulator: the quenched and tempered powdery material, the advanced film pressing cover, the material is evenly fed into the two pressing zones in the ring die with the help of gravity, the centrifugal force generated by the rotation of the ring die and the effect of the feeding scraper.

Date:2021-08-25


The pelletizing principle of ring die granulator: the tempered powdery material, advanced film pressing cover, the material is evenly fed into the two pressing zones in the ring die and the wedge space formed by the two pressing rollers and the ring die by means of gravity, centrifugal force generated by the rotation of the ring die and feeding scraper. the material is brought into the wedge space formed by the ring die and compressed. after extrusion, the material is extruded into the ring die hole and extruded out of the ring die, cut into pellets of suitable length by an adjustable cutter.

Pressing film and pressing roller: the main working parts of the granulator are pressing film and pressing roller. Common die hole types include straight hole type, stepped hole, outer tapered hole and inner tapered hole. The parameters of the die hole have a direct impact on the effect and quality of the granulator. Film thickness: the thickness of the die is determined by the material characteristics and the pore size of the membrane, and the corresponding optimal length (depth) diameter ratio is required to obtain high-quality particles for pressing different feeds. Die hole form: straight hole and step hole suitable for processing compound feed. The size of the opening rate of the surface of the pressing film tool has a great influence on the production of the press. Under the condition that the pressure die has sufficient strength, the opening rate should be increased as much as possible. The press roller is used to press the material to the die and extrude it from the die hole. In order to prevent "slipping" and increase the grip force, the surface of the pressure roller is drawn in the axial direction to increase friction and wear resistance. In view of the roller and die diameter ratio is about 0.4:1, the two line speed is basically equal, the roller wear rate is 2.5 times higher than the pressure die, so the hardness of the roller should be higher than the pressure die.

Grading screen: the materials fed into the feed inlet are evenly distributed on the whole screen surface under the circular movement of the screen body, and automatic grading is produced. Therefore, the material with smaller particle size below the material layer is sieved quickly, while the material with larger particle size above moves to the discharge end. During the movement, because there is no agitation and vertical beating, the smaller particles are always close to the screen surface and can be sieved at any time. The movement of the discharge end and the screen body becomes an approximate reciprocating linear movement until it is discharged out of the machine to complete the entire screening of the material. In the process of sieving, the constantly beating elastic balls effectively prevent the material from blocking the sieve holes and ensure the high efficiency of the sieve.

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