Double-sided ring spinning drafting system torsion control
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Solution Overview
Problem
In modern ring spinning machines with long drafting systems, the lower drafting rollers twist differently under torque and rotational resistance, leading to distortion errors and quality issues like thin or thick spots in the yarn, particularly during startup and shutdown, which existing solutions have not adequately addressed without complicating the machine structure or increasing workstation division.
Innovation Solution
A double-sided ring spinning machine design with an auxiliary drive device featuring an electric motor drive, main gearbox, and transfer gearboxes connected to drafting system lower rollers at specific bearing points, allowing for torque transmission and secure fixation without increasing workstation division, and enabling the use of multiple auxiliary drive devices to reduce roller diameter without torsional issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the lower drafting rollers have a large length, then the drafting system can handle longer slivers and improve productivity, but the rollers twist differently under torque leading to distortion errors and quality issues
Solution Approach 1:
The patent divides the single long drafting system into two separate drafting systems, each with its own lower drafting rollers of reduced length. This segmentation prevents excessive torsion in individual rollers while maintaining the overall productivity through parallel processing of two slivers simultaneously.
Solution Approach 2:
The patent transitions from a single-sided drafting system to a double-sided configuration, adding a spatial dimension to the machine architecture. This allows two independent drafting systems to operate in parallel, effectively doubling capacity while keeping individual roller lengths manageable.
2Manufacturing precision
If auxiliary drive devices are added to prevent roller torsion, then yarn quality improves, but the machine structure becomes more complex and workstation division increases
Solution Approach 1:
The patent combines the auxiliary drive function with the existing main drive system by using the same motor and transmission components to drive both drafting systems. This merging approach provides the necessary torque control to prevent roller torsion without adding separate auxiliary drive devices that would increase complexity.
Solution Approach 2:
The main drive system is designed to serve multiple functions: it drives both drafting systems simultaneously and provides the necessary torque control to prevent roller torsion. This multi-functionality eliminates the need for separate auxiliary drives while maintaining yarn quality.
3Productivity
If the roller diameter is reduced, then the machine footprint decreases and productivity improves, but torsional issues become more pronounced
Solution Approach 1:
By segmenting the drafting system into two separate systems with shorter rollers, the patent enables the use of smaller diameter rollers that would be prone to torsion in a single long system. The segmentation distributes the torque load, maintaining roller stability even with reduced diameter.
Solution Approach 2:
The patent employs dynamic torque control through the drive system to compensate for the reduced roller diameter. The drive mechanism adjusts torque delivery to prevent excessive torsion in the smaller rollers, enabling them to operate stably at higher speeds and improve productivity.
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 solution ensures largely torsion-free operation of the drafting system, maintaining workstation functionality and allowing for easy integration into existing machines without increasing spindle pitch or eliminating workstations, while enabling reduction in roller diameter without torsional complications.
Implementation Method 1
The auxiliary drive device (28) has an electric motor drive (29), a main gear (30) and two transfer gearboxes (31)
Implementation Method 2
The auxiliary drive device (28) has an electric motor drive (29), a main gear (30) and two transfer gearboxes (31)
Data Source
Figure 1
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AI summary
The invention relates to a double-sided ring spinning machine (1) with drafting units (3) on each side of the machine, which have several drafting unit underrollers (21, 22, 23) arranged one behind the other in the direction of travel of a fiber strip and rotating at different speeds, which can be actuated by drive devices (26, 27) arranged at the end of the machine and by at least one additional auxiliary drive device (28). The auxiliary drive device (28) is designed such that it can be switched on in the ring spinning machine (1) without increasing the division of the working stations (2) of the ring spinning machine (1) or having to omit one of the working stations (2).According to the invention, the auxiliary drive unit (28) comprises an electric motor drive (29), a main gearbox (30), and two distribution gearboxes (31), one of which is assigned to a lower roller (21, 22, 23) of the drafting units (3) arranged on one side of the machine, and the other is assigned to a lower roller (21, 22, 23) of the drafting units (3) arranged on the other side of the machine. Each distribution gearbox (31) is equipped with a mounting device (33) which is connected to the respective lower roller (21, 22, 23) of the drafting units (3) at a bearing point (38, 39) in a first space between two working locations for mounting the distribution gearboxes (31). The distribution gearboxes (31) are each connected at a drive point (18) at a second intermediate space between two working points (2) to the respective drafting unit lower roller (21, 22, 23) for the transmission of a torque.