Mobile Spool Support Fixing with Collars for Low-Wear Centering
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Solution Overview
Problem
Existing devices for storing belt spools with electrical components face issues with precise centering and alignment, leading to jamming and excessive wear due to diameter variations and large bearing play, especially with long bearing lengths.
Innovation Solution
The device employs a round bar with radially projecting collars for precise alignment, featuring axially spaced centering bores and a stop shoulder for axial support, along with a molded part design that allows low-friction insertion and removal through machined collars and slots, facilitated by a lifting mechanism for secure vertical positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a long bearing length is used for the round bar, then the holder can be securely fixed, but the friction length increases leading to excessive wear and jamming
Solution Approach 1:
The bearing support is segmented into two separate collars (first collar and second collar) positioned at different axial locations on the round bar. This segmentation allows the bearing length to be divided into two shorter segments rather than one long continuous bearing, reducing the friction length in each segment while maintaining secure fixation through the distributed collar structure.
2Measurement precision
If the round bar is made with large diameter to reduce play, then centering accuracy improves, but the rod becomes thicker and more difficult to handle and insert
Solution Approach 1:
The collars are designed with locally enhanced properties - they have a larger diameter than the round bar section between them, providing the necessary centering accuracy and bearing support at specific locations without requiring the entire round bar to have large diameter. This allows the bar to remain thin and easy to handle while achieving precise centering where needed.
3Ease of manufacture
If diameter tolerances are relaxed to reduce manufacturing costs, then production cost decreases, but centering accuracy deteriorates leading to jamming
Solution Approach 1:
The collars are pre-formed as integral parts of the round bar structure, with their centering surfaces machined to high precision independently of the bar diameter tolerances. This preliminary formation of precise centering surfaces at the collar locations ensures accurate centering even when the overall bar diameter has relaxed tolerances, maintaining centering accuracy without requiring expensive tight-tolerance manufacturing of the entire bar.
Data Source
Figure 1~4
Figure 5~8
Figure 9~11
AI summary
In a device for detachably fixing a mobile spool support (1) for receiving belt spools (2) with electrical components in a stacked manner, the spool support (1) is provided with a slim round rod (8) onto which the belt spools (2) can be mounted by way of their central hub from an upper free end. A lower end of the round rod (8) serves for detachably fixing the spool support (1). In particular, the lower end of the round rod (8) has collars (9a, 9b) which protrude in an annular and radial manner for radially supporting, aligning or centring the round rod (8). The axial distance between the collars (9a, 9b) is greater than the outer diameter of one of the two collars (9a, 9b) and the round rod (8) has a downwardly pointing stop shoulder (11) for vertical support. As a result, it is possible to for the round rod (8) to be inserted with a short stroke and a low level of frictional wear into a holder (13) which is matched to the collars (9a, 9b), and for the round rod (8) to be respectively removed from said holder.