Strap Joining Control with Cam-Driven Heating Blade
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Solution Overview
Problem
Existing strapping devices face issues with unreliable and inefficient joining of strap overlaps due to overheating or insufficient heating, leading to vapor generation and inconsistent joint quality, particularly when dealing with different strap materials and geometries.
Innovation Solution
A strapping device with a controller-regulated heating blade and cam shaft system that adjusts speed and temperature control for precise strap joining, using a spring-supported heating blade and a joining plunger for efficient contact and removal, along with a user interface for input parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a heating blade is used to join overlapping portions of the strap, then joining efficiency is improved, but overheating occurs leading to vapor generation and unreliable joining
Solution Approach 1:
The patent applies parameter changes by implementing a controller that regulates the heating blade's temperature and the cam shaft's rotation speed. The controller adjusts the operating temperature of the heating blade and the duration of contact between the heating blade and strap based on different strap materials and geometries, preventing overheating while ensuring sufficient heating for reliable joining.
Solution Approach 2:
The patent implements feedback control through the controller that monitors and adjusts the heating process. The controller receives input parameters about the strap type and automatically adjusts the heating temperature and contact time, creating a closed-loop control system that ensures optimal joining conditions and prevents harmful overheating effects.
2Reliability
If the heating blade temperature is increased to improve joining, then joining reliability improves, but overheating occurs generating vapor and smoke
Solution Approach 1:
The controller dynamically adjusts the heating blade temperature based on the specific strap material and geometry being processed. By optimizing the temperature parameter for each strap type, the system achieves reliable joining at the minimum necessary temperature, preventing excessive heating that would cause vapor and smoke generation.
Solution Approach 2:
The system transitions from static, fixed-temperature heating to dynamic, adjustable-temperature heating. The controller modifies the operating temperature in real-time based on input parameters, allowing the heating process to adapt to different strap materials and prevent harmful overheating effects.
3Object-generated harmful factors
If the heating blade temperature is decreased to prevent overheating, then vapor generation is reduced, but joining reliability deteriorates due to insufficient heating
Solution Approach 1:
The controller optimizes the heating temperature parameter specifically for each strap material and geometry combination. This ensures that the minimum necessary temperature is applied to achieve reliable joining without exceeding the threshold that causes vapor generation, resolving the trade-off between sufficient heating and preventing overheating.
Solution Approach 2:
The cam shaft mechanism provides periodic contact between the heating blade and the strap, controlling the duration of heating. By adjusting both the temperature and the contact time, the system achieves effective joining while limiting total heat exposure to prevent vapor generation.
4Device complexity
If a fixed-speed cam shaft is used, then device complexity is reduced, but adaptability to different strap types deteriorates
Solution Approach 1:
The controller adjusts the cam shaft rotation speed parameter based on the specific strap material and geometry being processed. By varying the rotation speed, the system controls the duration and intensity of heating contact, enabling adaptation to different strap types while maintaining a relatively simple mechanical cam shaft structure.
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 reliable and efficient strap joining by controlling heating blade movement and temperature, adapting to various strap types, reducing overheating and vapor generation, and enhancing joint quality.
Implementation Method 1
a heating blade insertable between the two overlapping portions of the strap... configured to control an operating temperature of the heating blade
Implementation Method 2
a cam shaft operatively coupled with the heating blade such that the heating blade is movable by the cam shaft
Implementation Method 3
a joining plunger configured to press the two overlapping portions of the strap onto each other
Data Source
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AI summary
A strapping device (100) for strapping one or more articles with a strap is described, comprising a tensioning apparatus (2) for tensioning the strap around the one or more articles, a joining apparatus (1) for joining two overlapping portions of the strap, wherein the joining apparatus (1) comprises a heating blade (11) insertable between the two overlapping portions of the strap and a joining plunger (12) configured to press the two overlapping portions of the strap onto each other, the strapping device (100) further comprising a cam shaft (3) operatively coupled with the heating blade (11) such that the heating blade (11) is movable by the cam shaft (3), a motor operatively coupled with the cam shaft (3) and configured to drive the cam shaft (3), and a controller (4) connected with the motor and configured to control the speed of rotation of the cam shaft (3), wherein the controller (4) is further connected with the heating blade (11) and configured to control an operating temperature of the heating blade (11).