Abrasive Strip Holder with Removable Groove Blocking Plug
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Solution Overview
Problem
Existing abrasive tools, such as abrasive drums, are expensive and complex due to their sturdy construction, making them costly and difficult to manufacture and maintain.
Innovation Solution
A holding device for abrasive strips featuring a cylindrical drum with undercut axial grooves, stops, and a shaft connected via a non-circular engagement structure, utilizing a removable end plug with groove blocking means, allowing for simpler and cost-effective assembly and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the drum is made sturdy to withstand high-speed rotation and pressing forces, then the reliability and strength are improved, but the manufacturing cost and complexity increase
Solution Approach 1:
The drum is divided into two parts: a sturdy main body made of expensive material for structural strength, and a separate end cap made of cheaper material that provides the groove blocking function. This segmentation allows each part to be optimized independently for its specific function, reducing overall manufacturing cost while maintaining necessary strength.
Solution Approach 2:
Different parts of the drum have different material requirements. The main drum body needs high strength to withstand rotation and pressing forces, while the end cap with groove blocking means can be made of weaker, cheaper material since it primarily serves a containment function rather than structural support.
2Reliability
If fixed stops are formed in the drum to block the undercut axial grooves, then the reliability of groove blocking is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The groove blocking function is separated from the main drum body and placed in a removable end cap. This allows the end cap to be manufactured independently with the groove blocking features, simplifying the main drum structure while maintaining reliable groove blocking through the end cap's groove blocking means.
Solution Approach 2:
The end cap with groove blocking means is designed to be removable, transforming a static fixed structure into a dynamic adjustable one. This allows the groove blocking function to be maintained while enabling easier manufacturing and potential reconfiguration of the blocking mechanism.
3Power
If a non-circular engagement structure is used to lock the shaft to the drum, then the torque transfer efficiency is improved, but the manufacturing complexity increases
Solution Approach 1:
A non-circular engagement structure (such as a hexagonal or polygonal shape) is used instead of a circular one. This asymmetric geometry provides positive engagement that efficiently transfers torque from the shaft to the drum, while the standardized non-circular shapes can be manufactured using common machining operations or even hand tools, balancing performance with manufacturability.
4Ease of operation
If the end plug is made removable for easier maintenance and groove access, then the ease of operation is improved, but the reliability of axial position fixation may worsen
Solution Approach 1:
The end cap is designed as a removable component that can be easily attached and detached along the shaft axis. This dynamic design allows for easy maintenance and groove access when removed, while when attached, it provides reliable axial position fixation through its interference fit and groove blocking means, thus resolving the contradiction between accessibility and fixation reliability.
Data Source
AI summary
Disclosed is a holding device (1) for abrasive strips (2). The holding device (1) comprises a drum (3) being substantially cylindrical and including a number of undercut axial grooves (4) extending from a first axial drum end (5) of the drum (3) toward a second axial drum end (6) of the drum (3), wherein one or more stops (7) are arranged to block at least a part of each of the number of undercut axial grooves (4) at the second axial drum end (6), wherein the drum (3) comprises a blind hole (8) in the centre of the first axial drum end (5), and wherein a non-circular engagement indentation (9) is formed in the centre of the bottom (10) of the blind hole (8). The holding device (1) also comprises a shaft (11) arranged coaxially with the drum (3), wherein the shaft (11) comprises a main shaft part (12) including a first axial shaft end (13) extending from the drum (3) and arranged for being connected to rotation drive means. The shaft (11) further comprises an external non-circular engagement structure (14) arranged at a second axial shaft end (15) of the main shaft part (12), wherein the external non-circular engagement structure (14) is arranged in the non-15 circular engagement indentation (9) to rotatably lock the shaft (11) to the drum (3), and wherein the greatest radial extent (GES) of the external non-circular engagement structure (14) is greater than the greatest radial extent (GEM) of the main shaft part (12). Furthermore, the holding device (1) comprises an end plug (16) being releasably connected to the drum (3), wherein the end plug (16) comprises a centre protrusion (17) extending into the blind hole (8) to restrict axial displacement of the external non-circular engagement structure (14) to substantially fixate an axial position of the shaft (11) in relation to the cylindrical drum (3) and wherein the end plug (16) further comprises groove blocking means (18) arranged to block at least a part of each of the number of undercut axial grooves (4) at the first axial drum end (5). Use of a holding device (1) is also disclosed.