Floating Strapping Head for Tension Equalization
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Solution Overview
Problem
Existing strapping machines apply tension unevenly around a load, with external forces applied in only one direction, leading to inadequate tension equalization and requiring additional parts for balancing.
Innovation Solution
A floating strapping head with separate tensioning and sealing modules, connected by a drive assembly using a motor, rack, and gear system, allows these modules to move laterally and together, ensuring equal tension on both sides of the strapping head without the need for springs or cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a stationary tensioning device is used to pull strap in one direction, then the strap can be tensioned, but the tension is unequal around the load and additional balancing parts are required
Solution Approach 1:
The strapping head is made movable along the strap feed direction through a floating mechanism with rollers on rails, allowing it to dynamically adjust its position to equalize tension forces applied in both directions on the strap loop, eliminating the need for stationary single-direction tensioning
Solution Approach 2:
The tensioning system applies forces in opposite directions on the strap loop simultaneously, with the floating strapping head positioned to balance these opposing forces, creating equal tension distribution around the load without requiring additional balancing components
2Manufacturing precision
If a floating strapping head with spring return or mechanical push is used to equalize tension, then tension uniformity improves, but device complexity increases due to additional parts
Solution Approach 1:
The floating strapping head uses a passive floating mechanism with rollers that allow free movement along the rails in the strap feed direction, enabling the head to self-adjust its position to equalize tension without requiring active springs, cylinders, or other mechanical pushing components
Solution Approach 2:
The strapping head is separated into functional modules (sealing mechanism, tensioning device, grippers) that can independently perform their functions while the entire assembly floats on the guide rails, allowing complex tension equalization through simple modular design
3Adaptability or versatility
If separate tensioning and sealing modules are used with a drive assembly, then functional flexibility increases, but device complexity increases
Solution Approach 1:
The separate tensioning module and sealing module are merged into a single floating strapping head assembly that moves together as one unit along the guide rails, allowing independent functional modules to be combined in a compact configuration without increasing overall system complexity
Data Source
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AI summary
A floating strapping head (18) is for use in a strapping machine of the type for positioning, tensioning and sealing a strapping material to itself around a load. The strapping machine has a frame (14) and a strap chute (16). The floating strapping head includes a tensioning module (28), a separate sealing module (26) and a drive assembly (40) operably connected to the tensioning module and the sealing module. The drive assembly is configured to move the tensioning and sealing modules toward and away from one another. The head includes a guide (48) along which the tensioning and sealing modules move laterally, together and toward and away from one another. When tension is drawn in the strapping material with an end of the strapping material gripped by the sealing head and an opposite- portion of the.strapping material gripped by the tensioning module, the drive is actuated to move the tensioning and sealing modules away from one another. The tensioning and sealing modules float, moving along the guide, as one, to equalize the tension in the strapping material on either side of the strapping head.