Warp Knitting Machine Support Shaft Thermal Expansion
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Solution Overview
Problem
Warp knitting machines face issues with tool collisions and quality deterioration due to thermal expansion, especially at high speeds and large working widths, where precise alignment and minimal deformation are crucial, and existing solutions like temperature control or segmented support shafts are either complex or overly stress the knitting tool bar.
Innovation Solution
A support shaft comprising a fiber-reinforced plastic rod extending over the entire length with separate metal or ceramic support tubes, each connected via limited points, absorbs axial forces and minimizes thermal expansion effects, ensuring the knitting tool bar's stability and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature control devices are used to maintain support shafts at predetermined temperatures, then thermal expansion effects are reduced, but device complexity and cost increase
Solution Approach 1:
The patent extracts the thermal expansion problem by removing the support shaft from the temperature control system entirely. Instead of controlling the temperature of the support shaft, the invention uses a fiber-reinforced plastic rod that is inherently insensitive to temperature fluctuations, thereby eliminating the need for temperature control devices while maintaining positional stability of the knitting tool bar
Solution Approach 2:
The patent replaces expensive and complex temperature control systems with a simple, cost-effective fiber-reinforced plastic rod. This material choice provides thermal stability without requiring additional control mechanisms, sensors, or energy input, making the solution both cheaper and simpler while achieving the same reliability outcome
2Reliability
If support shaft is divided into segmented sections with spacing, then thermal expansion effects are reduced, but knitting tool bar must be stronger and more heavily loaded
Solution Approach 1:
The patent removes the support shaft from the system entirely and replaces it with a fiber-reinforced plastic rod that has inherent thermal stability. This eliminates the need for segmentation and the associated spacing requirements, thereby removing the additional strength demands placed on the knitting tool bar while still achieving thermal expansion reduction
Solution Approach 2:
The patent employs fiber-reinforced plastic as a composite material for the support rod. This composite material combines the dimensional stability of plastic with the strength of reinforcing fibers, providing both thermal insensitivity and structural adequacy without requiring the knitting tool bar to be excessively strong or heavily loaded
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 reduces the impact of thermal expansion on the knitting tool bar, preventing collisions and maintaining fabric quality by distributing loads and minimizing material stress, while being cost-effective and easy to maintain.
Implementation Method 1
These temperature differences result in thermal expansion in most elements of the warp knitting machine. This applies in particular to the elements made of metal.
Data Source
Figure 1~4
AI summary
The invention relates to a warp knitting machine (1, 24) with at least one knitting tool bar (10) which carries a plurality of knitting tools and is connected to a support shaft (12) by means of support levers (11). The negative effects of thermal expansion of the support shaft (12) are to be minimized, while at the same time enabling the most cost-effective and simple design of the warp knitting machine. To achieve this objective, it is provided that the support shaft (12) comprises a rod (17) made of fiber-reinforced plastic extending over the entire length of the support shaft (12), wherein the support shaft (12) further comprises at least two axially separated support tubes (14, 15, 16), the rod (17) extending through all support tubes (14, 15, 16), and wherein each support tube (14, 15, 16) is at least partially connected to the rod (17) via at least one connection point (21, 22).