Segmented Shaft Guard With Non-Helical Threads to Prevent Sagging
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Solution Overview
Problem
Existing shaft guards for machines with rotating shafts often sag due to weight, are difficult to install, and may not comply with safety standards due to large openings, posing safety hazards and requiring custom-made solutions for varying shaft lengths.
Innovation Solution
A segmented shaft guard with a mounting segment and a shaft cover secured via non-helical tapered trapezoidal threads, allowing for incremental adjustment and manufacturing from thermosetting polymers via injection molding, ensuring a stable and adjustable fit without compromising safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shaft cover is made to protect the rotating shaft, then safety is improved, but the shaft cover sags due to its own weight
Solution Approach 1:
The shaft guard is divided into multiple segments including a mounting segment and a shaft cover segment that can be assembled separately. This segmentation allows the mounting segment to provide structural support while the shaft cover segment provides protection, preventing sagging while maintaining safety.
Solution Approach 2:
The mounting segment is pre-equipped with non-helical threads that engage with corresponding threads on the shaft cover segment before final assembly. This preliminary threading arrangement ensures proper alignment and distribution of mechanical loads, preventing sagging during operation.
2Manufacturing precision
If a shaft cover is custom made to fit a predetermined shaft length, then fit precision is improved, but manufacturing complexity and time increase
Solution Approach 1:
The shaft guard is segmented into modular components with standardized interfaces. The mounting segment and shaft cover segment can be manufactured independently using standard injection molding processes, then assembled together. This modularity maintains precise fit while simplifying manufacturing.
Solution Approach 2:
The non-helical thread design and standardized segment interfaces create a universal mounting system that can accommodate various shaft lengths and machine configurations. A single mounting segment design can be used across multiple applications, reducing manufacturing complexity while maintaining precise fit.
3Ease of operation
If a shaft cover has large openings for shaft access, then ease of installation is improved, but safety is compromised due to unsafe access to rotating shaft
Solution Approach 1:
The shaft guard is divided into a mounting segment that provides structural support and a shaft cover segment that provides protection. The segmented design allows the cover to be installed over the shaft without requiring large openings, maintaining safety while enabling straightforward installation through the modular assembly approach.
Solution Approach 2:
The non-helical threads act as an intermediary mechanism that facilitates easy assembly and disassembly of the shaft cover without compromising the integrity of the protective enclosure. The threads enable tool-free or minimal-tool installation while maintaining a secure, closed structure that prevents unsafe access.
4Strength
If non-helical tapered trapezoidal threads are used to secure the shaft cover, then connection strength is improved, but manufacturing precision requirements increase
Solution Approach 1:
The use of non-helical tapered trapezoidal threads changes the geometric parameters of the connection interface. The trapezoidal profile with specific taper angles provides self-centering and load-distributing characteristics that enhance connection strength. While manufacturing precision is required, the standardized thread geometry can be accurately produced through injection molding processes.
Solution Approach 2:
The shaft guard segments are manufactured from thermosetting polymers that provide the necessary strength and dimensional stability to maintain precise thread geometry during assembly and operation. The material properties compensate for minor manufacturing variations, ensuring reliable connection strength.
Data Source
AI summary
A shaft guard for a machine includes a base that has a mounting segment configured to be secured to a stationary part of the machine and a longitudinal segment that extends outwardly from the mounting segment and terminates at a distal end thereof. The longitudinal segment has first non-helical threads on a portion thereof. The shaft guard includes a shaft cover that extends longitudinally from a connection end to a free end thereof. The shaft cover has a second non-helical threads on a portion thereof. One or more of the first non-helical threads engage respective ones of the second non-helical threads to secure the shaft cover to the base.