Description

Among various groove designs for pellet mill rollers, the Fishbone hole roller shell demonstrates exceptional performance in the production of high-quality feed pellets and biomass pellets due to its unique bionic structure. A Fishbone hole roller shell refers to a roller whose working surface is machined with fishbone-patterned grooves or holes, where a main groove and branch grooves are distributed at certain angles, resembling a fish skeleton, subjecting the material to multi-directional shearing and pushing during pressing.

The core advantages of the Fishbone hole roller shell are mainly reflected in the following aspects:

First, extremely strong material intake capability. The fishbone-shaped branch groove structure generates multi-angle gripping forces on the material during roller rotation, effectively “biting” the material and forcing it into the compression zone between the roller and the die. This design is particularly suitable for raw materials with longer fibers, poor flowability, or higher moisture content, such as straw, forage grass, and silage.

Second, uniform material distribution and high pellet quality. The main groove and branch grooves of the fishbone slot work together to evenly spread the material across the roller surface and continuously extrude it, avoiding localized accumulation or idle running. The finished pellets have uniform density, smooth surfaces, and low powdering rates, making them especially suitable for producing premium aquafeed and pet food pellets.

Third, smooth discharge and good heat dissipation. The multi-channel structure of the fishbone slot provides multiple paths for material and heat to escape, reducing the risk of clogging while increasing the air contact area on the roller surface, facilitating rapid heat dissipation and extending roller service life.

In terms of material and process, high-quality Fishbone hole roller shells are manufactured from high-alloy steel or carburized bearing steel (e.g., 20CrMnTi, GCr15) through forging, carburizing, overall quenching, and low-temperature tempering. The working layer hardness reaches HRC58-62, while the core maintains good toughness.

Regarding compatibility, Fishbone hole roller shells can be customized with inner hole diameter, keyway, roller width, and fishbone slot distribution parameters according to original mill specifications. They are compatible with both ring-die and flat-die pellet mills and fit major brands worldwide.

In summary, with its comprehensive advantages of strong material intake, uniform distribution, and smooth discharge, the Fishbone hole roller shell is an ideal choice for pelleting high-fiber and specialty materials.

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