Belt Conveyor Pre-Compression for Stalk Pelletizing
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Solution Overview
Problem
Existing devices for compacting fibrous plant material, such as stalks, face inefficiencies in pre-compaction and processing large quantities, often requiring pre-shredding and struggling with blockages and reactive power issues during the pelletizing process.
Innovation Solution
A device featuring a drivable conveyor belt that creates a pre-compression area between press drums with alternately juxtaposed receiving grooves and pressure rings, allowing for uniform pre-compaction and processing of long-fiber stalks without pre-shredding, along with a design that minimizes reactive power by ensuring all material is compacted into press channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a screw feed conveyor is used to feed material to pressing drums, then the device can handle free-flowing material, but it causes blockages and requires pre-shredding of stalks which reduces processing efficiency
Solution Approach 1:
The patent replaces the traditional screw feed conveyor with a belt conveyor system. This substitution eliminates the blockage issues inherent in screw conveyors when handling fibrous stalk material, while the belt conveyor's open surface allows whole stalks to be fed without pre-shredding, thus maintaining high processing speed.
Solution Approach 2:
The patent changes the feeding mechanism from a enclosed screw conveyor to an open belt conveyor system. This parameter change in the feeding system's structure allows for different material handling characteristics - the belt conveyor can accommodate whole stalks and fibrous material without causing blockages, improving both reliability and productivity.
2Volume of moving object
If the pre-compression area is designed with a narrow width, then the device structure is compact, but it reduces the processing capacity and quantity of material that can be handled
Solution Approach 1:
The patent extends the pre-compression area in the longitudinal direction (along the conveyor belt travel) to compensate for the limited width. By creating a longer compression path rather than a wider compression area, the device maintains compact transverse dimensions while achieving sufficient processing capacity through increased longitudinal engagement.
Solution Approach 2:
The patent employs a drivable conveyor belt that can be adjusted in speed and tension to optimize the pre-compression process. The dynamic control of the belt allows the system to handle varying material quantities efficiently within the constrained width, maintaining productivity through operational flexibility rather than physical expansion.
3Manufacturing precision
If the conveyor belt wraps around the press drum over a large angular range, then uniform pre-compaction is achieved, but the device complexity and space requirements increase
Solution Approach 1:
The patent designs the conveyor belt to wrap around the press drum over an angular range of 30° to 120° before the material enters the pressing zone. This preliminary wrapping action allows the material to be gradually fed and pre-positioned against the drum surface, ensuring uniform distribution and contact area without requiring complex adjustment mechanisms during operation.
4Ease of manufacture
If press drums with receiving grooves and pressure rings are used, then pellets can be formed effectively, but reactive power issues and energy losses occur during operation
Solution Approach 1:
The patent implements a pre-compression area where the conveyor belt feeds material against the press drum surface before the actual pressing occurs. This preliminary compression prepositions and pre-compresses the material, reducing the energy required during the main pressing phase and minimizing reactive power losses while maintaining effective pellet formation.
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 device achieves high pre-compaction efficiency, allows for the processing of large quantities quickly, and reduces reactive power by ensuring all material is effectively pressed into the press channels, enhancing the economical production of pellets.
Implementation Method 1
the conveyor belt approaches the circumference of at least that press drum which is wrapped around the conveyor belt to a certain minimum degree for effective compaction
Data Source
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Figure 3
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AI summary
The invention relates to an apparatus for pelletizing renewable raw materials, such as stalk material, comprising a feeding device (15) for feeding the materials to be pelletized and at least one press drum pair (9) that can be set to rotate in different directions. The feeding device (15) comprises a drivable conveyor belt that conveys the material to be compacted towards the region of a feed hopper between the press drum pair (9) and that wraps around at least part of one of the press drums through an angle of at least 20% to form a pre-compaction region, the pre-compaction region having a constant width, corresponding approximately to the width of the press drum, relative to its length.