Segmented Drafting Cylinders in Roving Frames
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Solution Overview
Problem
Increasing the number of drafting points in roving frames to enhance productivity leads to breakages of drafting cylinders and the devices used to move them, compromising structural reliability and machine performance.
Innovation Solution
The roving frame incorporates segmented drafting cylinders and electronic control systems to manage rotation speeds, allowing for a higher number of drafting points without cylinder breakages, by segmenting the second and third drafting cylinders into sections and using electronic motors for precise speed control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of drafting points is increased to enhance productivity, then hourly productivity increases, but breakages of drafting cylinders and moving devices occur more frequently
Solution Approach 1:
The drafting cylinders are divided into multiple independent segments along their longitudinal extension. Each segment can be independently supported and driven, reducing the mechanical stress and breakage risk on any single section while maintaining the overall functionality of the drafting system across multiple drafting points.
Solution Approach 2:
Independent support structures and intermediate bearing devices are introduced between the drafting cylinder segments and the frame. These intermediaries distribute the mechanical loads and reduce stress concentration, preventing breakages while enabling a higher number of drafting points to be implemented.
2Productivity
If the number of drafting points is increased to improve productivity, then output increases, but the frequency of cylinder breakages rises
Solution Approach 1:
Drafting cylinders are segmented into multiple sections with independent support bearings for each segment. This segmentation reduces the span length and bending moments on each cylinder section, maintaining structural strength while allowing more drafting points to be arranged along the cylinder length.
Solution Approach 2:
The system employs independent motor drives for each drafting cylinder segment, allowing dynamic speed control and reducing mechanical shocks. This dynamic control prevents excessive stress on cylinder structures while maintaining high productivity through optimized drafting speeds at each point.
3Productivity
If more drafting points are implemented to increase productivity, then machine output improves, but device breakages occur more often
Solution Approach 1:
The drafting system is divided into modular segments, each with standardized support structures and independent drives. This modular segmentation allows multiple drafting points to be added systematically without proportionally increasing overall system complexity, as each segment follows a repeatable design pattern.
Solution Approach 2:
The support structures and bearing devices are designed with universal applicability across all drafting cylinder segments. This universality reduces the variety of unique components needed, thereby controlling device complexity even as the number of drafting points and overall productivity increase.
Data Source
Figure 1
Figure 2a~2b
Figure 2c~2d
AI summary
A roving frame (1) of a spinning line comprises a drafting device (10) with a third lower cylinder (103), a second lower cylinder (102) and a first lower cylinder (101). The third lower cylinder (103) and the second lower cylinder (102) are segmented, whereas the first lower cylinder (101) is continuous between the ends of the frame or segmented.