Pivoting Return Idler Trainer for Conveyor Belt Centering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional return side idlers for conveyor belts face issues such as requiring continuous adjustment, having a large footprint, causing damage to the belt and rollers, and failing to maintain contact with cupped or high-tension conveyor belts, leading to inefficient centering.
Innovation Solution
A pair of fully-tapered roller elements pivotally mounted on a non-collinear shaft, forming a parallel profile with the conveyor belt, ensuring constant contact and using speed differentials to automatically pivot the belt back to center, regardless of its profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional return side idlers are used to correct conveyor belt travel, then the belt can be guided back to center, but continuous adjustment is required which increases operational complexity and maintenance
Solution Approach 1:
The return side idler is designed with a self-adjusting mechanism that automatically corrects belt drift without requiring external intervention. The idler frame pivots about a vertical axis in response to belt contact forces, creating a self-centering action that eliminates the need for continuous manual adjustment while maintaining reliable belt centering
Solution Approach 2:
The idler assembly incorporates dynamic elements including a pivoting frame that can rotate about a vertical axis and roller elements that can adjust their position. This dynamic structure allows the idler to automatically adapt to belt position variations and maintain optimal centering function without fixed geometric constraints
2Extent of automation
If vertical guide rollers are used to force the belt back to center, then automatic adjustment is achieved, but the footprint and assembly size become excessively large
Solution Approach 1:
Instead of using vertical guide rollers that extend upward from the belt surface, the invention employs a pivoting frame mechanism that operates in the horizontal plane. The frame pivots about a vertical axis, allowing the idler to correct belt position through lateral movement rather than vertical projection, thereby reducing the assembly's footprint while maintaining automatic centering capability
Solution Approach 2:
The idler assembly uses a dynamic pivoting mechanism where the frame rotates about a vertical axis in response to belt contact forces. This dynamic adjustment allows automatic centering functionality to be achieved within a compact footprint, eliminating the need for large static guide roller assemblies
3Reliability
If conventional idlers are used to guide the return side belt, then belt travel can be corrected, but damage occurs to the belt edge and roller surfaces due to contact pressure
Solution Approach 1:
The invention employs roller elements with curved or tapered surfaces that contact the belt at distributed points rather than concentrated edges. This curvature distributes the contact pressure across a larger area, reducing stress concentrations that cause damage to both the belt edge and roller surfaces while maintaining effective belt travel correction
Solution Approach 2:
The idler design incorporates adjustable parameters including roller angle, contact pressure, and positioning that can be optimized to minimize damaging forces. The pivoting frame mechanism dynamically adjusts these parameters in response to belt position, maintaining gentle corrective forces that prevent damage while achieving reliable travel correction
4Reliability
If standard return side idlers are used, then they can guide the belt, but they fail to maintain contact with cupped or high-tension conveyor belts, leading to ineffective centering
Solution Approach 1:
The idler assembly incorporates dynamic elements that allow it to adapt to varying belt conditions. The pivoting frame can rotate about a vertical axis to follow cupped belt profiles, and the roller elements can adjust their position to maintain contact with high-tension belts. This dynamic adaptability ensures reliable centering function across diverse operating conditions without requiring multiple specialized idler types
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 solution provides continuous automatic adjustment and maintains contact with the conveyor belt, effectively centering it without damage, even with cupped or high-tension profiles, reducing maintenance and operational issues.
Implementation Method 1
using speed differentials to automatically pivot the belt back to center
Data Source
AI summary
An apparatus and method for an automatically pivoting return side idler trainer for returning a drifting conveyor belt back to a central position during operation. The trainer includes a non-collinear shaft having ends fixed to the conveyor structure while a non-collinear tube is pivotally mounted to the shaft. A tapered roller element is rotatably mounted to the tube on each side of the pivotal mounting. The shaft and tube include an offset angle that is determined by the taper angle of the tapered roller elements such that when the trainer is installed, the profile of the roller elements form a level surface along the trainer, parallel to the belt return side, regardless if the belt has a straight or cupped profile. A second embodiment uses a non-collinear shaft to which the tapered roller elements are rotatably mounted and whereby the shaft itself is pivotally mounted to an external conveyor structure.