Pellet Mill Roller Shells Crucial Spare Parts for Your Pellet Mills

What's The Roller Shell?

The rollers and pellet die work together to process the feed, so it's also one of the crucial spare parts for the pellet mills. Because the roller shells will suffer serious wear and lead the roller shells to wear out frequently. But the user does not need to change all the rollers and only replacing the roller shells should be fine if the eccentric shaft and other parts are fine. In this way, the cost will be reduced.

How to Choose The Suitable Roller Shells?

Raw Material:

Firstly, you need to choose roller shells with high-quality raw materials since the wear resistance and corrosion resistance is related to the raw material.

Shanbao Machinery uses high-quality of bearing steel which is a high carbon chromium bearing steel known for its excellent wear resistance and high hardness. This material is commonly used in the manufacture of bearing components due to its superior mechanical properties, high hardness and also good toughness.

Surface Shape:

Different manufacturers may have different shapes, and in Shanbao Machinery, there're six shapes of roller shells to choose, as: closed-end teeth, straight teeth, herringbone teeth, full dimples, hole +teeth, skewed teeth.  And you need to choose a suitable shape for your  feed production based on your raw material.

Straight teeth: have a strong rolling capacity but the materials will be dropped from the two sides.

Closed-end teeth: have a strong rolling capacity and the materials will not be dropped from the two sides. Because the material is easy to slip lead uneven wear, and is widely used in livestock and poultry feed production.

Full Dimples: Poor rolling capacity, but the materials won’t be dropped from the sides with even wear.

Suggest to choose hole+teeth for stronger roller capacity and even wear.

Modulus:

Modulus: 1.5; 1.75; 2; 2.5; 2.75; 3; 3.5; 4; 4.5; 5

Under the same depth of the teeth, coarse tooth (2.5modulus, depth 4) with lower volume and lower rolling capacity. It’s good to extend the grinding time and enhance the hardness of the pellets.

Smaller teeth ( 2modulus, depth 4) with higher volume and higher rolling capacity than the bigger ones.

The output is higher since the material comes out of the holes quickly, but the wear resistance is lower since the width of the teeth is too narrow.

Medium teeth ( 2.5modulus, depth 5) with the biggest volume, rolling capacity medium wear resistance. The material discharge speed is very fast. However, the high volume performance can not be fully utilized under certain conditions, as: lower opening rate and smaller holes.

Focus on the low yield and the hole’s opening rate can not be high for other reasons, you can select the medium teeth.

The fine teeth can be selected from the press roller to shorten the grinding time if the pellets are hard.

If the particle is too soft and the secondary compression is easy to produce large particles, and the coarse teeth can be selected to extend the grinding time of the material in the dies.

Size:

Since users are only replacing the roller shells, it means the user needs to ensure the roller shell sizes are exactly right. If there's any size is not right, it will lead to the new roller shell not being used.

Shanbao Machinery's Parameter

Raw material: High carbon chromium bearing steel

Depth of hardening layer: over 5mm

Roller hardness: 58-61 HRC

Bearing bore surface roughness: Ra 0.8-1.6

Coaxility of inner and outer circles: less than 0.05mm

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