Upstream-Inclined Pivoting Roller for Conveyor Belt Tracking
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Solution Overview
Problem
Conveyor belt tracking systems are ineffective in correcting belt mistracking under adverse conditions such as condensation, ice, or debris, as they require significant energizing forces and suffer from reduced friction and surface contact, leading to increased wear and reduced corrective influence.
Innovation Solution
A conveyor belt tracking apparatus with a pivotal tracking roller that shifts downstream and laterally away from its pivot connection upon mistracking, increasing tension in the belt and maintaining contact with the mistracking edge, utilizing an upstream-inclined pivot connection to steer the belt back to its central path without relying on large forces from sensor rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If sensor rollers are positioned far upstream to maximize torque arm, then torque about pivot axis is increased, but lateral displacement of sensor rollers increases and belt edge wear increases
Solution Approach 1:
The patent inverts the conventional approach by positioning the pivot connection upstream of the tracking roller instead of downstream. This inversion allows the tracking roller to pivot about an upstream pivot connection, which reduces the lateral displacement of sensor rollers and minimizes belt edge wear while still generating sufficient corrective torque to address belt mistracking.
2Ease of operation
If idler roller end portion shifts downstream to steer belt, then belt is redirected to central path, but surface contact and friction are reduced especially when interface is wet
Solution Approach 1:
The patent implements a dynamic pivoting mechanism where the tracking roller can pivot about an upstream pivot connection in response to belt mistracking. This dynamic adjustment allows the roller to maintain optimal surface contact with the belt by shifting laterally in response to detected mistracking conditions, thereby preserving friction and reliability even when the interface becomes wet or contaminated.
3Reliability
If significant energizing forces are applied to shift tracking roller upward, then belt tracking is corrected, but device complexity and force requirements increase
Solution Approach 1:
The tracking system utilizes the belt's own weight and the drag forces generated during mistracking as self-service energizing forces. When the belt mistracks, these forces automatically shift the tracking roller laterally about the upstream pivot connection, eliminating the need for complex external force generation mechanisms while maintaining effective tracking correction.
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 effectively corrects belt mistracking even in adverse conditions by increasing tension and maintaining contact, reducing wear and improving the steering mechanism's effectiveness, while minimizing the need for significant energizing forces and maintaining surface contact.
Implementation Method 1
an energizing torque created by drag forces acting between the tracking roller and the mistracking edge of the belt traveling thereover is increased
Implementation Method 2
The pivot connection is also preferably inclined in an upstream direction such that as the one end portion shifts downstream and laterally away from the pivot connection in response to mistracking of the conveyor belt it also shifts upwardly to increase tension in the mistracking edge of the conveyor belt
Implementation Method 3
steering the conveyor belt by shifting the end portion located at the side of the belt tracker toward which the belt is mistracking downstream relies on contact and corresponding friction between the conveyor belt and the idler roller
Data Source
AI summary
A conveyor belt tracking apparatus is provided for correcting the travel path of a laterally mistracking conveyor belt. In one form, an elongate tracking roller is rotatably mounted at end portions thereof to a pivotal support frame and extends across and below the belt. The pivotal support frame is mounted to a downstream pivot member so that belt mistracking toward one end portion of the tracking roller causes the one end portion to shift downstream and laterally outwardly to urge the belt toward the correct travel path. In one approach a downstream pivot connection between the pivot member and pivotal support frame is inclined upstream so that the end portion also shifts upwardly as it shifts downstream to urge the mistracking belt edge toward the correct travel path.