Open-End Spinning Auxiliary Thread Take-Up Speed Offset
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Solution Overview
Problem
Open-end spinning machines face issues with thread breaks and entanglements during the disposal of auxiliary threads and clamping/cutting processes, leading to large thread loops that can become entangled in the machine's vacuum duct, causing operational disruptions.
Innovation Solution
The auxiliary thread take-up is operated with a speed offset that accounts for the thread take-up speed of the workstation and additional correction factors, such as thread friction, to minimize the size and length of thread loops entering the accumulator navel, ensuring they do not cause breaks or entanglements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the auxiliary thread take-up operates at the same speed as the thread take-up device, then the thread disposal process is simple, but large thread loops are formed that can become entangled in the vacuum duct causing breaks and operational disruptions
Solution Approach 1:
The auxiliary thread take-up is equipped with a variable speed drive that dynamically adjusts its rotation speed during the disposal process. The speed is higher during initial take-up and automatically reduced when the thread loop approaches the accumulator navel, preventing entanglement in the vacuum duct while maintaining operational simplicity
Solution Approach 2:
The system changes the operational parameter (rotation speed) of the auxiliary thread take-up during the disposal process. By varying the speed parameter according to the thread loop position, the system prevents thread breaks caused by entanglement while keeping the control mechanism relatively simple through automated speed adjustment
2Reliability
If the thread loop size is minimized to prevent entanglement, then thread break risk is reduced, but the accumulator navel must precisely coordinate with the auxiliary thread take-up speed
Solution Approach 1:
A sensor detects the position and size of the thread loop during disposal and provides feedback to the control system. The control system automatically adjusts the auxiliary thread take-up speed based on this feedback, ensuring the thread loop enters the accumulator navel at the optimal moment with minimal size, preventing entanglement without requiring manual precision
3Object-affected harmful factors
If the auxiliary thread take-up speed is increased to reduce thread loop size, then entanglement risk decreases, but the speed must be precisely reduced at the right moment to prevent over-tensioning
Solution Approach 1:
The control system is programmed to automatically reduce the auxiliary thread take-up speed at a predetermined position of the thread loop, detected by a sensor. This preliminary speed reduction occurs before the thread loop could potentially become entangled, preventing the harmful effect while maintaining efficient disposal timing through automated advance action
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 reduces the risk of thread breaks and entanglements by controlling the thread loop size and length, providing sufficient space in the accumulator navel for new spinning threads and ensuring smooth operation during subsequent processes.
Implementation Method 1
a suction nozzle, which can be subjected to a vacuum
Data Source
AI summary
An open-end spinning machine having a plurality of workstations, each workstation has a spinning apparatus for producing a thread, a thread draw-off device for drawing off the thread from the spinning apparatus, a storage nozzle, a winding apparatus for producing a cross-wound bobbin, and a suction nozzle, to which negative pressure can be applied. The open-end spinning machine is equipped with at least one service unit, serving a plurality of the workstations and has an auxiliary-thread delivery device for delivering an auxiliary thread and an auxiliary-thread draw-off, which are used in a piecing process at a workstation to be served. The auxiliary-thread draw-off can be operated in such a way that the auxiliary-thread draw-off speed of the auxiliary-thread draw-off for drawing off the pieced auxiliary thread has a speed offset, which takes into account the thread draw-off speed of the thread draw-off device and at least one additional correction factor.