Segmented Knitting Machine Needle Bed Cooling
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Solution Overview
Problem
Existing needle beds in knitting machines face challenges in achieving effective and reliable cooling, particularly due to the need for tight seals and efficient heat distribution across large diameters, which are not adequately addressed by existing cooling methods.
Innovation Solution
A segmented needle bed design where segments with contact surfaces are connected to form cooling channels, allowing for direct coolant circulation without additional installation space, and sealing is achieved through complementary contact surfaces or sealing elements, ensuring efficient heat transfer and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a ring-shaped cover is used to seal cooling channels in large-diameter knitting cylinders, then cooling function is provided, but sealing reliability deteriorates due to large diameter making permanent tight sealing difficult
Solution Approach 1:
The knitting cylinder is divided into multiple segments (first segment, second segment, etc.) arranged axially adjacent to one another. The cooling channels are formed within these segments and connected through axial bores, eliminating the need for a separate ring-shaped cover. This segmentation approach maintains cooling effectiveness while improving sealing reliability by using direct segment-to-segment sealing at smaller interfaces rather than sealing a large-diameter cover.
2Reliability
If separate lids or closure means are used to seal cooling channels, then cooling channels are closed, but device complexity increases and additional installation space is required
Solution Approach 1:
The sealing function is merged into the segment structure itself. The axial bores pass through the segments and are sealed by the adjacent segments, so the segments simultaneously serve as both structural components and sealing elements. This eliminates the need for separate lids or closure means, reducing device complexity and removing the requirement for additional installation space.
3Ease of manufacture
If boundary surfaces are present between cooling channels and segment body, then manufacturing is simplified, but heat transfer efficiency deteriorates due to boundary surfaces preventing heat transfer
Solution Approach 1:
The harmful boundary surfaces are extracted/eliminated by forming the cooling channels directly within the segment material itself, rather than as separate embedded components. The coolant flows directly through channels formed in the segment, creating direct thermal contact between the coolant and the segment body, thereby eliminating thermal boundary layers and improving heat transfer efficiency while maintaining manufacturing simplicity.
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 design enables effective cooling of the needle bed by allowing coolant to circulate directly within the segments, eliminating boundary surfaces that hinder heat transfer, and providing high mechanical stability while maintaining high cooling efficiency without requiring separate lids or closure means.
Implementation Method 1
One or more cooling channels (12) are provided in at least one of its segments for cooling the needle bed (1)
Implementation Method 2
the coolant can circulate directly in the cooling channel of the segment and thus in the needle bed
Data Source
Figure 1
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Figure 3
AI summary
A needle bed (1) of a knitting machine is segmented. The segments (5, 6) adjoin each other via contact surfaces (10, 8). Cooling channels extend from at least one of the interface surfaces (10, 8), for example, in segment (6). The adjacent segment (5) covers these cooling channels and thus closes them.