Rapier Bar Cooling Guide Device with Dual Air and Liquid Circuits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rapier bars in rapier weaving machines overheat due to friction, especially at increased weaving speeds, and existing compressed air cooling methods are insufficient for newer, lighter rapier bars with poor heat conductivity.
Innovation Solution
A guide device with an air circuit and perforations for compressed air cooling, combined with a cooling liquid circuit, is used to effectively cool the rapier bar, with the air circuit limited to discrete zones and the cooling liquid circuit extending along the guide's length for enhanced heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If compressed air cooling is used through perforations in the guide element, then cooling effect is provided, but cooling sufficiency deteriorates at increased weaving speeds
Solution Approach 1:
The guide element is divided into multiple zones with different cooling mechanisms: a first zone with compressed air cooling through perforations, and a second zone with cooling liquid circulation channels. This segmentation allows each zone to be optimized for different cooling requirements, enabling sufficient cooling at high weaving speeds while maintaining the simplicity of compressed air cooling where adequate
Solution Approach 2:
Different regions of the guide element are assigned different cooling properties: the first zone uses compressed air permeation through perforations, while the second zone uses liquid cooling through channels. This local differentiation of cooling quality allows the system to address the insufficient cooling at high speeds in specific critical areas without compromising the overall system simplicity
2Weight of moving object
If rapier bars are made from materials with poor heat conductivity to reduce weight, then weight is reduced, but heat dissipation capability deteriorates
Solution Approach 1:
The guide element acts as an intermediary cooling system that compensates for the poor heat conductivity of lightweight rapier bar materials. By providing active cooling through compressed air and cooling liquid in contact with the rapier bar, the guide element mediates the heat dissipation problem, allowing lightweight materials to be used without suffering from inadequate heat conduction
3Measurement precision
If guide elements are designed to guide the rapier bar accurately, then positioning precision is improved, but friction-induced heating worsens
Solution Approach 1:
The guide element converts the harmful friction heat into a beneficial cooling opportunity by incorporating compressed air perforations and cooling liquid channels directly in the contact zones. The friction that causes heating is precisely where the cooling mechanisms are applied, transforming the heat-generating contact into a heat-removing interface while maintaining positioning precision
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 dual cooling method effectively limits the rapier bar's warming due to friction, ensuring accurate positioning and efficient cooling even at high weaving speeds, while reducing costs and adapting to various rapier bar materials and machine configurations.
Implementation Method 1
an air circuit through which compressed air can flow and which is provided with perforations for cooling the rapier bar by means of compressed air
Implementation Method 2
a cooling circuit through which cooling liquid can flow for cooling the rapier bar using cooling liquid
Implementation Method 3
the one or more guide elements delimit the movement trajectory of the rapier bar and may come into contact with this rapier bar when the rapier bar is moved
Data Source
Figure 1
Figure 2~5
Figure 6~7
AI summary
The present invention relates to a guide device comprising a guide (1) with one or more guide elements (2) for guiding a rapier bar (3) in a rapier weaving machine, wherein this guide device is provided with an air circuit (5) through which compressed air can flow and which is provided with perforations (7) for cooling the rapier bar (3) by means of compressed air, and wherein this guide device is provided with a cooling circuit (8) through which coolant can flow for cooling the rapier bar (3) by means of coolant. In addition, the present invention relates to an assembly of a rapier bar (3), drive means (4) and such a guide device. Furthermore, the present invention relates to a rapier weaving machine comprising such an assembly.