Cable Tie Tensioning with Closed-Loop Force Control
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Solution Overview
Problem
Existing cable tie tensioning tools lack accurate and consistent tension control, leading to inconsistent tensions, increased manual effort, and potential worker injury, while manual calibration is necessary for tool-to-tool consistency.
Innovation Solution
A cable tie tensioning device with a load cell and closed-loop control system that measures actual tension and adjusts operation to achieve a target tension, using a motor and lead screw drive for precise tensioning, and a separate cutting mechanism for accurate cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual cable tie tensioning tools are used, then device complexity is reduced, but manufacturing precision and reliability deteriorate due to inconsistent tension application and tool-to-tool variation
Solution Approach 1:
The patent replaces manual mechanical tensioning with an automated motorized system. A motor drives a lead screw mechanism that applies tension to the cable tie, eliminating the need for manual operation. This substitution of mechanical systems with automated electromechanical systems resolves the contradiction by providing consistent, repeatable tension application while maintaining relatively simple device architecture.
Solution Approach 2:
The patent incorporates a load cell that measures the actual tension applied to the cable tie and feeds this information back to a controller. The controller compares the measured tension with the target tension and adjusts the motor operation accordingly. This closed-loop feedback system ensures manufacturing precision and tension consistency while keeping the overall device complexity manageable through efficient control algorithms.
2Manufacturing precision
If automated motorized tensioning is implemented, then manufacturing precision improves, but device complexity increases due to additional components like motors, sensors, and control systems
Solution Approach 1:
The patent designs the motorized tensioning device to perform multiple functions: the motor drives the lead screw for tensioning, the lead screw mechanism provides both motion and force multiplication, and the controller manages both tension control and cutting operation coordination. This multi-functionality reduces the number of separate components needed, thereby limiting device complexity while maintaining high tension control accuracy.
Solution Approach 2:
The lead screw acts as an intermediary mechanism that converts rotational motor motion into linear tensioning force. This intermediary component simplifies the overall system architecture by providing a mechanical advantage that reduces the power requirements of the motor and simplifies the control system, thereby limiting device complexity while achieving precise tension control.
3Ease of operation
If manual operation is used, then ease of operation is maintained, but productivity deteriorates due to significant user force requirements and increased application time
Solution Approach 1:
The patent replaces manual mechanical operation with an automated motorized system that applies tension to the cable tie without requiring significant user force. The motorized actuation eliminates the need for operators to exert physical effort, greatly improving ease of operation while simultaneously reducing application time and increasing productivity.
Solution Approach 2:
The controller pre-configures the tensioning parameters and automatically executes the tensioning sequence without requiring operator intervention during the actual tensioning process. This preliminary programming of the operation sequence allows the device to execute tensioning rapidly and consistently, improving productivity while maintaining ease of operation through simple interface interaction.
4Manufacturing precision
If consistent tension control is achieved through calibration, then manufacturing precision improves, but loss of time increases due to regular calibration and testing requirements
Solution Approach 1:
The patent incorporates a load cell that provides real-time feedback on the actual tension applied during operation. This feedback mechanism allows the device to self-verify and self-adjust tension application without requiring external calibration equipment or procedures. The continuous monitoring and automatic adjustment eliminate the need for regular calibration and testing, thereby maintaining manufacturing precision while eliminating calibration time loss.
Solution Approach 2:
The device performs self-calibration and self-verification through its integrated load cell and control system. The controller continuously monitors tension application and automatically adjusts parameters to maintain consistency across different tools and operations. This self-service capability eliminates the need for external calibration services, reducing both time loss and dependency on external resources while maintaining high manufacturing precision.
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 consistent and precise cable tie tensioning with real-time feedback, reducing manual effort and tool-to-tool variation, enhancing safety and efficiency by preventing over-tightening or under-tightening.
Implementation Method 1
a sensor configured to measure an actual tension being applied by the tensioning assembly to the cable tie during operation of the tensioning assembly
Implementation Method 2
a motor mechanically coupled to a lead screw drive and configured to axially rotate the lead screw drive
Data Source
AI summary
A cable tie tensioning device is provided. The device includes a tensioning assembly configured to at least partially receive a cable tie and apply tension to the cable tie, and a user interface configured to receive as input a target tension to be applied by the tensioning assembly to the cable tie. The device further includes a sensor configured to measure an actual tension being applied by the tensioning assembly to the cable tie during operation of the tensioning assembly. The device further includes a controller in communication with the tensioning assembly, the user interface, and the sensor. The controller is configured to adjust operation of the tensioning assembly based on the measured actual tension from the sensor to achieve the target tension input at the user interface.