Positive-Drive Spiral Conveyor Segmented Ridge Design
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Solution Overview
Problem
Spiral conveyor systems face challenges with high belt tension and frictional losses in overdrive systems, and difficulties in clean engagement and disengagement of the conveyor belt with the drive structure in positively driven systems.
Innovation Solution
A drive tower design with parallel drive members featuring a ridge that varies in height from the bottom to the top, facilitating smooth engagement and disengagement of the conveyor belt along a helical path without overdrive, using a combination of angled and tapered segments to guide the belt into and out of engagement with the drive members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If overdrive systems are used to reduce maximum belt tension, then belt tension is reduced, but frictional losses increase and wear occurs on belt edge and drum surfaces
Solution Approach 1:
The drive members are segmented into three distinct segments (first, second, and third segments) along the spiral path, with each segment having different ridge configurations. This segmentation allows the belt to engage smoothly at the entrance, be positively driven in the middle section, and disengage cleanly at the exit, resolving the contradiction by eliminating slip while managing tension distribution.
Solution Approach 2:
Different segments of the drive members have different local qualities - the first segment has ridges for initial engagement, the second segment has ridges for positive driving, and the third segment has reduced or no ridges for clean disengagement. This local differentiation allows each section to perform its specific function optimally, reducing overall frictional losses while maintaining effective tension control.
2Loss of energy
If positively driven spiral systems are used to eliminate slip, then frictional losses are reduced, but clean engagement and disengagement of the belt becomes difficult
Solution Approach 1:
The drive members are divided into three functional segments along the spiral path: a first segment for belt engagement, a second segment for positive driving, and a third segment for belt disengagement. This segmentation allows smooth transition through different operational phases, resolving the contradiction between maintaining positive drive and enabling clean disengagement.
Solution Approach 2:
Instead of maintaining constant ridge contact throughout the spiral path, the invention inverts the approach by progressively reducing ridge contact - the third segment has reduced or no ridges compared to the second segment, allowing the belt to disengage cleanly after being positively driven, thus solving the engagement/disengagement problem while maintaining positive drive where needed.
3Reliability
If drive structure with regular spacing is used for positive engagement, then slip is eliminated, but belt tension requirements increase
Solution Approach 1:
The drive members are segmented into three sections with different ridge configurations, allowing positive engagement where needed while reducing tension requirements through progressive disengagement. The first segment establishes engagement, the second maintains positive drive, and the third reduces tension for clean release.
Solution Approach 2:
The ridge configuration on drive members is made dynamic rather than static - ridges are present in the first and second segments for engagement and positive driving, but reduced or absent in the third segment for disengagement. This dynamic variation in ridge presence allows the system to maintain reliable positive engagement when needed while reducing belt tension requirements during disengagement.
Data Source
Figure 1
Figure 2A~2C
Figure 3A~4B
AI summary
A spiral conveyor for positively driving a hinged, modular conveyor belt along a helical path. The spiral conveyor includes a rotating cylindrical tower with parallel drive members extending from the bottom to the top of the tower on its periphery. Each drive member includes an outwardly protruding ridge extending from the bottom to the top of the tower for engaging the inside edges of the belt, the ridges at a discharge end of the tower are retractable between an extended position driving the belt and a retracted position.