Press-Type Strapping Machine Platen Control for Consistent Load Height
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Solution Overview
Problem
Press-type strapping machines often result in loose straps due to the load being compressed differently by subsequent machines, leading to uneven strap tension and increased breakage risk.
Innovation Solution
A system with two strapping machines that control platen movement to maintain consistent load height, ensuring each machine applies the same compressive force and distance from the support surface, thereby maintaining consistent strap tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If multiple press-type strapping machines compress the load sequentially to target force, then the load is compressed to the same force level, but the load height varies between machines causing loose straps
Solution Approach 1:
The patent changes the compression parameter from force-based control to height-based control. Instead of compressing to a target force and hoping for consistent results, the system directly controls and measures the load height during compression. The platen position is adjusted so that the load reaches a predetermined height, ensuring consistent compression across multiple machines while maintaining the necessary compressive force for secure strapping.
2Force
If the platen moves further to reach target force on subsequent machines, then the compressive force is sufficient, but the load becomes shorter and straps become loose
Solution Approach 1:
The patent implements feedback control by measuring the actual height of the load during compression and using this information to adjust the platen position. The system continuously monitors the load height and stops compression when the predetermined height is reached, ensuring that the load maintains consistent dimensions across all strapping operations while applying sufficient compressive force to keep straps tight.
3Stability of the object's composition
If the load is compressed to the same force by all machines, then the compression is uniform, but the expansion force during unstrapping causes strap breakage
Solution Approach 1:
The patent changes the control parameter from force to height, which fundamentally alters how compression is applied. By controlling the final height of the load rather than the force applied, the system achieves uniform compression that doesn't over-compress the load. This prevents excessive expansion force during unstrapping while maintaining sufficient compression to keep straps tight, thereby reducing strap breakage.
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
Ensures secure and uniform strap tension across multiple strapping operations, reducing the likelihood of strap breakage and maintaining load integrity.
Implementation Method 1
the platen moves downward toward the support surface and into contact with the load. As the platen continues moving downward, it and applies a compressive force to the load and starts compressing the load
Implementation Method 2
As the platen moves upward and disengages the load, the load attempts to return to its original height by expanding upward. As this occurs, the strap loop(s) stretch slightly ender this expansion force but prevent full expansion
Data Source
AI summary
A system for compressing and strapping loads with press-type strapping machines having improved platen control is provided. The system includes first and second strapping machines each configured to compress and strap a load. The first strapping machine applies a compressive force to the load until a target compressive force is reached and then straps the load. The second strapping machine compresses the load until the height of the load is substantially the same as the height of the load when the first strapping machine strapped the load. The second strapping machine then straps the load. The system ensures the height of the load is substantially the same during each strapping operation.