Wire Tension Control Using Dynamic Feedback and Ceramic Rollers
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Solution Overview
Problem
Existing systems for controlling metal wire tension during winding processes are inadequate, as they often operate as open-loop systems, fail to adjust for varying wire diameters and resistances, and cannot maintain constant tension throughout the production process, leading to quality issues in the final product.
Innovation Solution
A system that includes a supply device with a control unit, tension sensors, and motors to adjust wire tension dynamically based on real-time measurements of wire diameter and resistance, allowing for closed-loop control and maintaining constant tension from the supply device to the machine, using ceramic rollers to minimize friction and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If entirely mechanical supply devices are used to control wire tension, then the device structure is simple, but the system cannot correct errors during the process and tension varies due to friction and speed changes
Solution Approach 1:
The patent implements a closed-loop feedback system where tension sensors continuously measure the actual wire tension and feed this information back to the control unit. The control unit compares the measured tension with the reference tension and automatically adjusts the wire supply speed to maintain constant tension, thereby resolving the reliability issue of mechanical systems while managing complexity through automated control.
Solution Approach 2:
The patent replaces purely mechanical tension control mechanisms with an automated control system that uses sensors, electronic processing, and motorized adjustment. This substitution eliminates the limitations of mechanical systems (friction, speed-dependent tension) while maintaining practical device complexity through integrated control units and standard actuators.
2Ease of operation
If a single working tension is set in mechanical supply devices, then the device is simple to operate, but different tensions cannot be set for different production steps
Solution Approach 1:
The patent implements dynamic tension control where the reference tension can be varied over time and adjusted according to different production steps. The control unit stores multiple reference tension values and automatically switches between them based on the winding phase (wrapping, working, loading), providing versatility while maintaining ease of operation through automated management.
Solution Approach 2:
The control unit is designed to handle multiple functions: it manages tension control for different production steps, adjusts wire supply speed, and adapts to various wire diameters. This multi-functionality allows a single device to replace multiple specialized devices while maintaining simple operation through centralized control.
3Reliability
If wire tension is increased to prevent loosening during loading, then wire adhesion improves, but wire extension occurs and section reduction increases resistance
Solution Approach 1:
The tension sensors provide real-time feedback on the actual wire tension during the loading phase. The control unit uses this information to maintain the minimum necessary tension for adhesion while preventing excessive tension that would cause wire extension and section reduction, thus preserving dimensional accuracy.
Solution Approach 2:
The system dynamically adjusts the reference tension parameter based on the production phase. During loading, it sets an appropriate tension level that ensures adhesion without causing excessive wire extension. The system also compensates for tension variations caused by friction and speed changes, maintaining optimal tension throughout the 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
Ensures consistent wire tension and resistance values throughout the production process, preventing physical modifications that could affect the final product's quality and allowing the system to handle a range of wire diameters and tensions.
Implementation Method 1
a tension sensor (25) capable of measuring the tension of the metal wire (F)
Implementation Method 2
using ceramic rollers to minimize friction and prevent damage
Data Source
AI summary
A system for supplying metal wire to a machine by a wire supply device. The wire having a desired tension detected by a tension sensor. The supply device has at least one rotary member driven by an actuator thereof on which the metal wire is wound for a fraction of rotation or several rotations and adapted to supply the wire to the machine with predefined tension under the action of a control unit. The system has a detector, for detecting at least one wire physical characteristic, downstream of the supply device and connected to the control unit to provide to the latter the data regarding each detected physical characteristic. The control unit intervening on the rotary member for adjusting the wire tension for maintaining, at least approximately around a reference value, the characteristic of the wire controlled. The latter is at least one dimensional and/or electrical characteristic.