Livestock Feed Machine Knowleagde

The formation of feed pellets is a very important process in the production of compound feeds, which directly affects the quality and cost of the products.

At present, most of feed pellet plants adopt ring die feed pellet machine. This feed pellet machine presses the powdery material into pellets by means of a stamper and a press roll. The working gap between the die rolls can be adjusted during shutdown by the eccentric mechanism at the press roll, and the range is generally from 0 to 4.5 mm. The gap is designed to be adjustable, and there are two considerations: one is to ensure that the die roll has a suitable working gap, especially the die roll can be adjusted to reduce the gap; the second is to facilitate the disassembly and assembly of the die and the cleaning when plugging. Die rolls of small and medium-sized pellet feed machine should have a working gap of 0.1 to 0.5 mm, which is too large to reduce productivity.

In actual production, because the gap is difficult to measure, it is often adjusted by the "intermittent contact method", that is, the pressure roller is adjusted under the condition that the inner surface of the stamper has no material, so that it is in a non-rotating state when the stamper rotates.

The small and medium-sized pellet feed machine is driven by the main power to rotate at a certain speed ω; the layer with thickness h is taken into the extrusion zone from point A; the pressure roller is frictionally driven by the pressing zone. The effect also rotates clockwise. As the mold roll rotates, the ingested material moves forward, and the pressing force and material density gradually increase. When the pressing force is increased enough to overcome the friction between the material plug and the hole wall in the die hole, it has a certain The density and cohesive material is squeezed into the die hole. Since the die roll continuously ingests the material, the material in the die hole is continuously formed into the die hole after being formed into a cylindrical particle.

The squeezing force in the nip area reaches a maximum when the material begins to be squeezed into the die hole and remains substantially at point C. From the point of pressure relief at point C to point F, the squeezing force gradually drops to zero. The reason why the CF has a pressing force is because the residual material passing through the point C expands in the section. After the F point, an expanded annular adhesive layer appears on the inner surface of the stamper. The thickness of the adhesive layer of the pellet feed press is related to the gap of the die roll, the rigidity of the die roll support structure, and the degree of expansion of the residual material. Obviously, the larger the gap of the die roll, the thicker the residual material layer, the more the expansion, and the thicker the adhesive layer.