Pellet Mill Feed System Conduit Design for Load Balancing
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Solution Overview
Problem
Pellet mills face unbalances due to uneven distribution of pelletizable material, leading to increased wear on structural elements and reduced maintenance efficiency, as material tends to accumulate at the bottom of the die chamber, and existing solutions either fail to address these issues or introduce new problems such as interference with shear pin safety mechanisms.
Innovation Solution
A pellet mill with a feed system featuring at least two conduits extending into the die chamber, each with a side opening that extends axially along the conduit and matches the length of the rollers, allowing for direct feeding of material into wedge-shaped spaces at varying locations, ensuring even distribution and load balancing, and incorporating adjustable screw conveyors and safety mechanisms to prevent overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If material is fed directly into the die chamber, then the feeding process is simple, but material accumulates at the bottom of the die chamber causing unbalances and increased wear
Solution Approach 1:
The feed system is segmented into multiple conduits (at least two) that distribute material to different locations in the die chamber. Each conduit has a side opening positioned at a specific height, allowing material to be delivered to different zones (e.g., upper and lower regions) to prevent accumulation at the bottom and maintain operational balance.
Solution Approach 2:
Different regions of the die chamber are targeted with material feed by positioning conduit side openings at different heights. The local feed location is optimized for each conduit to ensure even material distribution across the die chamber, preventing bottom accumulation while maintaining feeding simplicity.
2Reliability
If conduits are used to feed material to rollers, then material distribution can be improved, but the conduits may interfere with shear pin safety mechanisms
Solution Approach 1:
The conduit side openings are positioned at different heights (vertical dimension) relative to the rollers and shear pin mechanisms. By utilizing the vertical dimension for material delivery, the conduits can feed material effectively without interfering with the horizontal operation of shear pin safety mechanisms, thus maintaining both material distribution and safety functionality.
3Productivity
If material is fed to multiple rollers, then productivity increases, but uneven distribution leads to increased wear on structural elements
Solution Approach 1:
The feed system is divided into multiple independent conduits, each serving a specific roller or region. This segmentation allows precise control over material distribution to each roller, ensuring that all rollers receive adequate material for high productivity while maintaining even load distribution to prevent excessive wear on structural elements and bearings.
Solution Approach 2:
Each conduit is positioned to deliver material to a specific local region or roller, optimizing material distribution locally. This ensures that each roller receives the appropriate amount of material for maximum productivity while maintaining overall balance and minimizing wear on structural support elements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves even material distribution across the rollers, reducing wear and maintenance needs, extending the pellet mill's lifespan, and allowing for reliable operation without interfering with safety mechanisms, thus addressing the unbalances and inefficiencies of prior art.
Implementation Method 1
The conduit (24) has a circular cross section and comprises a screw conveyor (34) having a shaft tapering in the direction of feed
Implementation Method 2
at least two cylindrical rollers adapted to travel over said inner cylindrical surface of the die in a rolling motion... forming wedge-shaped spaces between the rollers and the inner cylindrical surface of the die
Data Source
AI summary
The invention pertains to a pellet mill 2 for forming pelleted material, the pellet mill 2 comprising: A die 4 having a cylindrical inner surface 6 with a plurality of apertures 8 formed therein and extending to the outside of the die 4, the volume bounded by said inner cylindrical surface 6 defining a die chamber 10. At least two cylindrical rollers 12, 14, 16 adapted to travel over said inner cylindrical surface 6 of the die 4 in a rolling motion. Drive means for causing relative rotation of the die 4 and the rollers 12, 14, 16, so that the rollers 12, 14, 16 will travel over the inner cylindrical surface 6 of the die 4, thereby forming wedge-shaped spaces 18, 20, 22 between the rollers 12, 14, 16 and the inner cylindrical surface 6 of the die 4. A feed system, comprising at least two conduits 24, 26, 28, one associated with each of the at least two rollers 12, 14, 16, extending into the die chamber 10, each of the conduits 24, 26, 28 having a side opening 32 for feeding the pelletizable material 30 into the wedge-shaped spaces 18, 20, 22 between the rollers 12, 14, 16 and the inner cylindrical surface 6 of the die 4, the side opening 32 extending axially along the conduit 24, 26, 28 and having an extension that is equal to the length of the rollers 12, 14, 16, wherein at least one of the conduits 24, 26, 28 is configured for feeding the pelletizable material 30 directly to a wedge-shaped space 22, which is at a higher location in the die chamber than said conduit 28.