Conveyor Frame Retaining Cavity Eliminates Belt Sag
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Solution Overview
Problem
Catenary sag in the lower run of a plastic chain conveyor belt downstream from the drive roller causes the belt to sag beneath the conveyor frame, leading to increased height and safety hazards, as existing designs fail to adequately compensate for the belt's stretching under load.
Innovation Solution
An enclosed retaining cavity within the side frame members allows the conveyor belt links to 'tent', reducing the overall length of the belt and eliminating catenary sag by accommodating the increased length due to loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the conveyor belt is designed to accommodate stretching under load, then the belt can maintain functionality under tension, but catenary sag occurs in the lower run causing the belt to extend beneath the conveyor frame
Solution Approach 1:
The patent introduces a vertical retaining cavity within the conveyor frame that provides a third dimension (vertical space) for the belt to tent upward. This converts the horizontal sagging problem into a vertical accommodation solution, allowing the belt to absorb stretching by tending upward within the cavity rather than sagging outward below the frame.
Solution Approach 2:
The retaining cavity is divided into multiple segments or zones that guide the tenting action of the belt links. The cavity structure is segmented to provide controlled pathways for the belt to tent upward in a structured manner, preventing uncontrolled sagging while accommodating the stretching.
2Adaptability or versatility
If the conveyor belt is allowed to sag to compensate for stretching, then the belt can absorb length increase, but safety hazards arise from personnel contact with the sagging belt
Solution Approach 1:
The patent converts the potentially harmful sagging motion into a beneficial upward tenting motion within the enclosed cavity. The belt's natural tendency to sag under stretching is redirected upward into the retaining cavity, transforming a safety hazard into a controlled mechanical accommodation that protects personnel while maintaining belt functionality.
3Weight of moving object
If the conveyor belt stretches under load, then the belt can handle increased weight, but the overall conveyor height must be increased to accommodate the sag
Solution Approach 1:
The patent utilizes the vertical dimension within the existing frame height by creating a retaining cavity that extends upward. This allows the belt to accommodate stretching vertically within the cavity rather than requiring an increase in the overall conveyor assembly height, maintaining compact dimensions while supporting increased load capacity.
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 reduces the overall length of the conveyor belt, preventing sagging and maintaining a stable operational height, while allowing for the belt's expansion during use, thus enhancing safety and operational efficiency.
Implementation Method 1
the weight of the products on the plastic belt and the wear of the belt links cause the belt to 'stretch' when the belt is under load. When the belt is placed under a larger load, the 'stretching' of the conveyor belt increases the length of the belt
Data Source
AI summary
A conveyor frame assembly for use with a conveyor belt formed from individual links each joined together at pivot points. The conveyor frame assembly includes a drive assembly that pulls the conveyor belt around a drive roller to transition between the upper and lower runs of the conveyor belt. The drive end includes a support block that encloses the side edges of the conveyor belt as the conveyor belt transitions over the drive sprockets. The side frame members each include a continuous retaining channel having a height greater than the thickness of the conveyor belt. The retaining channels formed on opposite sides of the conveyor frame assembly allow the lower run of the conveyor belt to “tent” by creating an angle between adjacent links of the conveyor belt assembly. The tenting of the lower run of the conveyor belt eliminates catenary sag.