Grooved Cage Bar Caps for Stable Spiral Conveyor Belt Engagement
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Solution Overview
Problem
Existing spiral conveyor belt systems face issues with belt disengagement from the drum cage, leading to product damage, system failure, and increased tension, particularly in small radius systems with limited footprint requirements.
Innovation Solution
A spiral conveyor system with grooved, ribless cage bar caps and specially designed links (rho and psi shapes) that allow for increased compressed pitch and stable engagement, reducing belt tension and preventing disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cage bar caps with ribs are used to engage the belt, then belt engagement is achieved, but belt disengagement occurs due to cage bar deflection and structural weakness
Solution Approach 1:
The cage bar cap is segmented into a cap body and a separate reinforcement element (such as a rib or protrusion) that engages with the belt. This segmentation allows the cap body to provide structural strength while the reinforcement element provides engagement features, resolving the contradiction between engagement stability and structural strength.
Solution Approach 2:
The cage bar cap utilizes composite construction combining materials or structural elements with different properties - a strong base material for structural integrity and a harder or more wear-resistant material for the engagement surface. This composite approach simultaneously achieves reliable engagement and prevents cage bar deflection.
2Area of stationary object
If the inner radius of the belt spiral is reduced to decrease footprint, then smaller footprint is achieved, but belt tension increases leading to disengagement
Solution Approach 1:
The belt is pre-tensioned or pre-positioned during installation or startup to optimal tension levels before operation begins. This preliminary action ensures the belt is properly seated and tensioned, preventing disengagement even when operating with a reduced inner radius that would otherwise increase tension during operation.
Solution Approach 2:
The system allows dynamic adjustment of operational parameters such as belt speed, tension, or engagement force based on the inner radius configuration. When operating with a smaller inner radius, the system automatically adjusts these parameters to maintain optimal tension levels, preventing disengagement while achieving reduced footprint.
3Device complexity
If friction-based engagement is used between drum and belt, then simple engagement is achieved, but secure coupling is insufficient preventing disengagement
Solution Approach 1:
An intermediary element such as a friction rib, protrusion, or engagement feature is introduced between the drum surface and the belt. This intermediary provides positive mechanical engagement while maintaining relative simplicity, combining the advantages of both friction-based and positive engagement mechanisms.
Solution Approach 2:
The engagement mechanism utilizes periodic interaction between the drum and belt through features such as spaced ribs or segmented engagement elements. This periodic engagement provides secure coupling throughout the rotation cycle while maintaining simple overall system design, preventing disengagement without requiring complex continuous engagement mechanisms.
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 system achieves stable belt engagement, reduces the risk of disengagement, decreases material and energy costs, and extends the life of the conveyor system while maintaining a smaller footprint.
Implementation Method 1
A grooved, 'ribless' cage bar cap, wherein grooves extend below an outer-facing surface of the cage bar cap and are configured to engage with a belt support rod inner-end or a belt-link tab
Implementation Method 2
the drum is configured to rotate around the central longitudinal axis and to releasably interact with each of the plurality of segments at the outer boundary
Implementation Method 3
a conveyor belt that moves in a corkscrew-shaped path to vertically transit items on the belt along lengthened helical path
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3C
AI summary
Disclosed herein are embodiments of a spiral conveyer belt system. Embodiments of the system allow for a longer compressed pitch and improved engagement/disengagement interactions between a drum and an inner edge of a spiral conveyor belt while maintaining necessary product support and belt support strength. In part, the disclosures relate to a grooved, "ribless" cage bar cap, wherein grooves extend below an outer-facing surface of the cage bar cap and are configured to engage with a belt support rod inner-end or a belt-link tab. The bar cap groove may be straight (generally orthogonal to the outer-facing surface) or angled to better engage and drive the belt so the belt cannot slip forwards or outwards with respect to a drum outer boundary.