Textile Intermingling Device Inertia Compensation
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Solution Overview
Problem
Conventional intermingling devices in the textile industry face issues with inconsistent yarn intermingling due to variable spool inertia, leading to inefficient compressed air usage and production of low-quality yarns, especially in intermittently operating machines like sock producers.
Innovation Solution
The method involves detecting the speed and movement of base threads to synchronize the compressed air feed with the intermingling process, shutting down the air feed only after the threads have stopped and reactivating it before they start, thereby optimizing air usage and ensuring consistent intermingling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the electric motor is kept in stand-by condition when accumulated yarn is sufficient, then energy consumption is reduced, but the spool inertia causes delayed stopping and starting, leading to inconsistent intermingling quality
Solution Approach 1:
The control unit activates the compressed air jet before the motor actually starts rotating the spool, and maintains it after the motor stops. This preliminary and extended air jet activation compensates for the inertia-induced delay in spool response, ensuring continuous and consistent intermingling of threads even during motor stand-by periods.
Solution Approach 2:
The system dynamically adjusts the compressed air jet duration based on motor operation states. The air jet is activated in advance of motor start and extended beyond motor stop, creating a dynamic timing profile that accounts for the inertial characteristics of the spool system and maintains intermingling consistency throughout the motor's operational cycles.
2Manufacturing precision
If the compressed air jet is activated continuously to ensure consistent intermingling, then intermingling quality is maintained, but compressed air is wasted during motor stand-by periods
Solution Approach 1:
The compressed air jet is activated only when needed - specifically, it starts before the motor rotates the spool and continues after the motor stops. This eliminates unnecessary continuous operation during motor stand-by periods while ensuring the air jet is present during the actual intermingling process, thus preventing compressed air waste.
Solution Approach 2:
The control unit uses feedback from motor operation status to regulate compressed air jet activation. By monitoring when the motor starts and stops, the system intelligently controls the air jet timing to match actual intermingling needs, avoiding waste during idle periods while maintaining quality during operation.
3Speed
If the spool diameter and weight decrease as thread is unwound, then the spool accelerates and decelerates faster, but this variable inertia makes it difficult to predict stop and start times for air jet control
Solution Approach 1:
Instead of attempting to precisely predict spool stop and start times based on varying inertia, the system uses a fixed time-offset approach: activating the air jet a predetermined time before motor start and extending it a predetermined time after motor stop. This simplifies control logic while effectively compensating for inertia variations throughout the spool's operational life.
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
This approach minimizes compressed air waste, maintains high-quality intermingled yarn production, and reduces energy consumption in industrial settings with multiple intermingling devices.
Implementation Method 1
The intermingling is usually achieved by passing the threads, or baves, through a turbulent air jet; the jet causes threads or baves to be wound, and the formation of the randomly intermingled points mentioned above.
Data Source
AI summary
A thread intermingling device for textile machines includes a nozzle oriented to intercept the path of the base threads, a corresponding compressed-air feed line and intercepting means to intercept the line. The base threads are led next to the nozzle and impinged by a jet of compressed air causing intermingling. A control unit controls the intercepting means for shutting down the feed to the nozzle instantaneously or with delay with respect to the device stop and for reactivating the feed of compressed air to the nozzle instantaneously or in advance with respect to the device restart, and for the feedback automatic reactivation depending on the detected speed or movement of base threads.