Segmented Plunger Press for High-Density Bale Compression
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Solution Overview
Problem
Existing plunger press technologies face inefficiencies in achieving high bale density due to the need for extremely high plunger forces and energy input, leading to increased weight and mechanical stress, particularly when trying to double bale density, which results in energy losses and a risk of twine material breakages.
Innovation Solution
The plunger structure is divided into structurally separated compression surfaces, each smaller than the bale cross-section area, which execute compression cycles with a time shift, allowing for higher bale density with moderate actuation force and energy input by distributing compression cycles across smaller surfaces, reducing the need for significant reinforcement and minimizing twine material stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a one piece plunger structure with full cross-section compression surface is used, then compression force is applied to the entire material strand, but extremely high plunger forces and energy input are required to achieve high bale density
Solution Approach 1:
The plunger structure is divided into multiple separate plunger parts (first plunger part, second plunger part, etc.), each with its own compression surface. These plunger parts execute compression cycles with time shifts, distributing the compression action across different portions of the material strand at different times, thereby achieving high bale density without requiring extremely high simultaneous compression forces across the entire cross-section.
Solution Approach 2:
The plunger parts execute compression cycles periodically with time shifts between them. The first plunger part compresses a first portion of the material strand during one compression cycle, then retracts, while the second plunger part compresses a second portion during a subsequent compression cycle. This periodic, staggered compression action reduces the peak energy input required compared to simultaneous full-cross-section compression.
2Manufacturing precision
If plunger structure actuation force is increased to double bale density, then bale density increases, but plunger structure actuation force and required primary energy increase massively
Solution Approach 1:
By segmenting the plunger structure into multiple parts that compress different portions of the material strand at different times, the required actuation force for each individual plunger part is significantly reduced compared to a single plunger compressing the entire cross-section. The force requirement is distributed across multiple smaller compression events rather than one large simultaneous compression event.
Solution Approach 2:
Each plunger part compresses only a partial portion of the material strand cross-section at a time, rather than the entire cross-section simultaneously. This partial action approach allows achieving the same overall compression effect with much lower individual actuation forces, as each plunger part only needs to overcome the resistance of a fraction of the material strand.
3Manufacturing precision
If high plunger forces are applied to achieve high bale density, then bale density increases, but twine material stress increases and there is an acute danger of twine material breakages
Solution Approach 1:
The compression action is segmented into multiple smaller compression events applied at different locations and times along the material strand. This prevents the application of extremely high concentrated forces that would transmit excessive stress to the twine material binding the bale, thereby reducing the risk of twine breakages while still achieving high bale density through cumulative compression effects.
Solution Approach 2:
The staggered, periodic compression cycles allow the twine material to withstand the compression forces better. By compressing different portions at different times rather than applying maximum force simultaneously across the entire bale, the peak stress transmitted to the twine is reduced, preventing acute danger of breakages.
4Manufacturing precision
If a one piece plunger structure is used, then compression is applied to the entire cross-section area, but the weight of the plunger press increases significantly
Solution Approach 1:
The plunger structure is segmented into multiple lighter plunger parts that can be individually designed and positioned. Each plunger part only needs to be sufficient for compressing a portion of the material strand, making them individually lighter than a single full-cross-section plunger. The overall system achieves the same compression effect with reduced total weight.
5Manufacturing precision
If energy input is increased to achieve high bale density, then bale density increases, but there are energy losses for shifting the material strand
Solution Approach 1:
By segmenting the compression action into multiple plunger parts that compress different portions at different times, the material strand is compressed in situ at multiple locations rather than requiring large-scale shifting operations. This reduces energy losses associated with moving the entire material strand back and forth, as compression is applied locally at multiple points throughout the bale formation process.
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
This approach achieves high and uniform bale density with reduced mechanical load on components and lower energy requirements, avoiding the need for oversized fly wheels and minimizing twine material stress, while maintaining high production efficiency.
Implementation Method 1
The compression surfaces execute compression cycles with a time shift or phase shift in-between on respective partial surfaces of the bale cross-section area only
Data Source
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AI summary
A plunger press produces compressed bales of forage, straw, biomass or fibrous mass for agricultural and/or industrial use. The press includes a bale case, a reciprocating plunger structure, at least one material feeding duct laterally leading into a material charge feeding section of the bale case, and at least one plunger structure drive mechanism. The plunger structure compresses respective material charges fed from the feeding duct into the bale case. The plunger structure is subdivided perpendicularly to a reciprocation direction of the plunger structure in the bale case into at least two structurally separated compression surfaces. Each of the compression surfaces is smaller than a cross-section area of the bale case. The compression surfaces are driven substantially parallelly in the reciprocation direction and with a time shift in relation to each other to alternatingly compress material on partial surfaces of the cross-section area.