Polishing Shuttle With Radial Projections For Tube Friction Reduction
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Solution Overview
Problem
In medical applications, achieving smooth sliding between inner and outer cylindrical tubes with minimal friction without the use of lubricants is challenging, especially in high-volume industrial production processes where additional lubricants are problematic and costly.
Innovation Solution
A polishing shuttle with axially flexible radial projections that form undulations is used to polish the inner walls of cylindrical tubes, allowing for reduced friction through a single pass, eliminating the need for lubricants and integrating seamlessly into automated manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a lubricating agent is introduced between the inner part and outer tube, then friction is minimized and sliding is facilitated, but the presence of the lubricating agent becomes problematic for medical applications
Solution Approach 1:
The invention extracts and eliminates the lubricating agent from the system by replacing it with a polishing treatment on the outer tube's inner wall. The polishing creates a smooth surface that reduces friction without requiring any foreign substance, thereby solving the contradiction between minimizing friction and avoiding foreign bodies in medical applications.
Solution Approach 2:
The outer tube's inner wall is given self-service properties through polishing treatment, where the surface itself becomes friction-reducing without needing external lubrication. The smooth polished surface serves its own function of facilitating sliding, eliminating the need for separate lubricating agents that would introduce foreign bodies.
2Force
If a polishing shuttle with radial projections is used to polish the inner wall, then the sliding resistance is divided by four or more in a single pass, but the complexity of the polishing device increases
Solution Approach 1:
The polishing shuttle is segmented into multiple radial projections distributed around its circumference. Each projection independently contacts and polishes a portion of the inner wall, allowing the entire circumference to be polished in a single pass. This segmentation enables the fourfold reduction in sliding resistance while keeping the device structure relatively simple and manageable.
Solution Approach 2:
The invention transitions from polishing a single point or line to polishing the entire circumferential surface by adding radial projections in the radial dimension. This dimensional expansion allows simultaneous contact with multiple points on the inner wall, achieving comprehensive polishing in one pass without proportionally increasing device complexity.
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 significantly reduces the resistance between the inner and outer tubes, allowing for efficient sliding without lubrication, while being simple, cost-effective, and adaptable for high-volume industrial production.
Implementation Method 1
The ends of these projections, coming into contact with the wall of the tube, bend slightly backwards with respect to the direction of movement. Their friction on the inner wall of the tube polishes the latter.
Data Source
Figure 1~3
Figure 4A~4D
Figure 5
AI summary
The polishing shuttle allows for polishing the inner wall of cylindrical tubes (24A, 24B, 124), particularly those used in medicine. It comprises flexible radial projections (12) along the axial direction, capable of polishing the inner wall of tubes by a simple relative movement between the shuttle and the tube, the shuttle passing inside the tube. In a longitudinal section, the projections form a series of separate, slender undulations in the radial direction. The polishing process enabled by the shuttle is particularly simple, as a single pass of the shuttle may be sufficient to achieve polishing; the process is therefore quick and easy to automate, for example, in the polishing device according to the invention.