Interlaced Finger Rail Joints for Conveyor Alignment
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Solution Overview
Problem
Conventional conveyor systems face issues with misalignment and wear due to manufacturing and installation tolerances, leading to jarring and noise when moving elements traverse joints between track sections, particularly in high-speed linear motor conveyor systems.
Innovation Solution
The system employs angled or tapered rail connections, such as finger-and-groove or tongue-and-groove configurations, to allow for alignment tolerances of up to 25 microns or less, ensuring smooth transitions by supporting bearings on both sides of the joint, reducing the likelihood of bumps and maintaining alignment even with manufacturing inaccuracies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If reduced manufacturing tolerances are used for track sections, then manufacturing cost is reduced, but misalignment and jarring occur at joints between track sections
Solution Approach 1:
The rail connection geometry is changed from a conventional flush joint to an interlaced finger joint with specific dimensional parameters. The fingers have width w and length L, with an interlaced overlap configuration that allows angular misalignment up to a predetermined tolerance while maintaining continuous bearing support. This geometric parameter change enables the use of reduced manufacturing tolerances without compromising joint alignment quality.
Solution Approach 2:
The finger joint structure acts as an intermediary element between adjacent track sections. Instead of directly joining flat rail ends, the interlaced fingers create a transitional zone that accommodates misalignment and provides a smooth path for bearings, mediating the connection between sections with different alignments.
2Ease of manufacture
If conventional flush joints are used between track sections, then manufacturing is simpler, but bearings experience jarring and wear at joints
Solution Approach 1:
The interlaced finger joint design provides beforehand cushioning by creating an overlapping transition zone that prevents direct impact between bearings and misaligned joint surfaces. The gradual transition through the interlaced fingers cushions the bearing passage, eliminating sudden jarring effects that would otherwise occur at flush joints with even minor misalignment.
Solution Approach 2:
The finger joint creates a curved or tapered transition path rather than a sharp angular joint. The interlaced fingers form a gradual geometric transition that guides bearings smoothly from one track section to another, replacing the sharp discontinuity of conventional flush joints with a curved transition surface.
3Productivity
If high-speed operation is implemented, then productivity increases, but misalignment effects are magnified causing increased wear and noise
Solution Approach 1:
The finger joint design dynamically adapts to high-speed operation conditions. The interlaced configuration maintains continuous contact and support for bearings during rapid acceleration and deceleration, providing dynamic stability that prevents misalignment-induced wear and noise even at high production speeds.
Data Source
AI summary
A joint system and method for managing alignment tolerances in a track section of a conveyor, the system including: a plurality of track sections, each track section including at least one end to be joined with an adjacent track section and one or more rails on which bearings of moving elements move; and wherein, at the end of each track section, the one or more rails each comprise a finger such that rails from adjacent track sections form an interlaced connection between fingers from each track section and both fingers are angled such that a non-alignment of the rails will not jar a bearing moving over the joint.