Textile Suction Nozzle Shielding for Thread Pickup
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Solution Overview
Problem
Textile machines producing cross-wound bobbins face difficulties in reliably picking up upper threads, especially with hairy yarns or when threads are drummed into the bobbin surface, due to inefficient suction nozzle designs that often require complex and energy-intensive arrangements of additional pneumatic devices.
Innovation Solution
A work station with a suction nozzle equipped with a shielding device that prevents suction air flow from occurring below the nozzle, concentrating the suction air stream from above and enhancing thread detachment and pickup, while maintaining energy efficiency by avoiding lower suction air flows that hinder thread pickup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional pneumatic devices are arranged in the suction nozzle area to improve thread pickup, then thread pickup reliability is improved, but device complexity and energy consumption increase
Solution Approach 1:
The suction nozzle is divided into multiple functional zones with separate suction openings: an upper suction opening for effective thread pickup and a lower suction opening that is selectively sealable. This segmentation allows independent control of air flows in different regions, improving thread pickup reliability without requiring additional complex pneumatic devices throughout the entire nozzle structure.
Solution Approach 2:
Different regions of the suction nozzle are given different functional qualities: the upper region has an open suction opening for consistent thread engagement, while the lower region has a sealable suction opening that can be closed during operation. This local differentiation optimizes thread pickup in the upper area while preventing harmful lower air flows, achieving improved reliability without system-wide complexity.
2Reliability
If additional pneumatic devices are arranged in the suction nozzle area to improve thread pickup, then thread pickup reliability is improved, but energy consumption increases
Solution Approach 1:
The harmful lower suction air flow is extracted and eliminated by sealing off the lower suction opening during thread pickup operations. This removes the energy-wasting counterproductive air flow while maintaining the necessary upper suction flow for thread pickup, thereby improving reliability while reducing overall energy consumption.
Solution Approach 2:
The lower suction opening, which creates harmful air flows, is discarded (sealed closed) during critical operations. This eliminates the energy waste associated with the lower suction flow while preserving the useful upper suction function, achieving both improved reliability and reduced energy consumption.
3Temperature
If suction air flow occurs below the suction nozzle, then cooling effect is provided, but thread pickup is hindered
Solution Approach 1:
The lower suction opening is designed to be dynamically sealable, allowing the system to switch between different operational states: open when cooling is needed and closed when thread pickup is required. This dynamic control resolves the contradiction by providing cooling effect during non-critical periods while ensuring reliable thread pickup when needed.
Solution Approach 2:
The lower suction opening operates periodically - open during periods when cooling is beneficial and closed during periods when thread pickup is critical. This periodic action allows the system to alternate between providing cooling effect and ensuring reliable thread pickup, resolving the contradiction through time-based separation of functions.
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
The shielding device significantly improves the reliability of thread pickup and reduces energy consumption by intensifying the suction air stream, reducing failure rates and energy costs without increasing the number of failed attempts.
Implementation Method 1
a so-called suction nozzle is first applied with its mouth to the surface of the take-up spool, which is slowly rotating counter to the winding direction, and with negative pressure is applied. The vacuum-loaded suction nozzle then tries with its mouth to pick up the thread end
Implementation Method 2
a shielding device (19A, 19B, 19C) installed below the suction opening (18) of the suction nozzle (17), which with its sealing element (22A, 22B, 22C), when the suction nozzle (17) is positioned in the yarn end pick-up position, prevents a lower suction air flow (SLSu) from occurring between the suction nozzle (17) and the contact roller (9)
Data Source
AI summary
The invention relates to a workstation of a textile machine for creating cross-wound spools. The workstation is provided with a wire suction nozzle. The wire suction nozzle is loaded at a negative pressure to be rotated. The head part of the wire suction nozzle is provided with a suction opening. The suction opening is used for picking up hard wastes already wound onto a winding bobbin within a surface region of the winding bobbin. According to the invention, the workstation is provided with shielding units, (19A, 19B, 19C). The shielding units are arranged below the bottom surface of the wire suction nozzle. When the wire suction nozzle (17) loaded at a negative pressure is positioned in a yarn pick-up device, a suction air flow (SLSu) in the suction opening (18), flowing into the wire suction nozzle (17) from below, is generated below the wire suction nozzle (17).