Conveyor End Drive Guiding Envelope for Lengthwise Expansion
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Solution Overview
Problem
Conveyors with straight-running modular mats face significant lengthwise expansion issues, leading to the need for a catenary sag section, which occupies space and is costly, especially in applications like people movers and pasteurizers where space is limited.
Innovation Solution
A guiding envelope in the return guide is used to retain the conveyor mat, allowing successive modules to slide into each other in a compression zone, compensating for lengthwise expansion without a sag section, by having oversized hinge holes and slotted holes, and using U-shaped guiding channels to limit movement and reduce friction and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a catenary sag section is used to compensate for lengthwise expansion, then the conveyor can accommodate thermal expansion and tensile forces, but the conveyor occupies additional space and increases construction complexity
Solution Approach 1:
The hinge hole diameter is changed from a fixed dimension to an oversized dimension relative to the hinge pin diameter. This parameter change allows the hinge connection to accommodate lengthwise expansion through radial movement of modules into the interspace, eliminating the need for a catenary sag section while maintaining structural integrity
Solution Approach 2:
The conveyor mat is divided into modular sections with individual modules connected by hinge pins. This segmentation allows each module to move independently radially into the interspace during lengthwise expansion, distributing the expansion accommodation across multiple discrete points rather than requiring a continuous sag section
2Adaptability or versatility
If a catenary sag section is used to compensate for lengthwise expansion, then the conveyor can accommodate thermal expansion, but the construction cost and complexity increase
Solution Approach 1:
The hinge hole diameter is increased beyond the minimum required for the hinge pin, creating clearance that enables radial module movement. This simple parameter change transforms the rigid hinge connection into a compliant joint that automatically accommodates thermal expansion without additional mechanical components
Solution Approach 2:
The oversized hinge holes enable the conveyor mat to self-accommodate lengthwise expansion through the natural radial movement of modules into the interspace. The structure serves its own expansion compensation function without requiring external sag sections or additional active components
3Adaptability or versatility
If hinge holes are oversized to allow module movement, then the conveyor can expand without buckling, but friction and wear may increase
Solution Approach 1:
The oversized hinge holes provide localized clearance specifically in the radial direction to accommodate expansion movement, while maintaining precise hinge pin alignment. This localized quality change allows movement where needed without compromising the overall structural rigidity and alignment of the conveyor mat
Solution Approach 2:
The hinge connection allows circular/rotational movement of modules into the interspace during expansion, utilizing a curved motion path rather than linear movement. This curved motion naturally reduces friction compared to sliding contacts and distributes wear more evenly across the hinge interface
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
This solution eliminates the need for a catenary sag section, allowing the conveyor to expand without buckling, reducing space requirements and operational costs, while maintaining low friction and wear, and enabling longer conveyor lengths without increased surface pressure or wear.
Implementation Method 1
In the guiding envelope, the successive modules are held in a flat plane, so that they can be passed through the guiding envelope with low friction and wear
Data Source
Figure 1
Figure 2~4
AI summary
End drive for a conveyor, comprising a conveying track (6) for, during use, guiding a conveying part of a straight-running modular conveyor mat (2), a return guide (10) extending at a distance along the conveying part for return guidance of a return part of the conveyor mat, and a gear drive (16) located between the conveying track and the return guide for, through engagement of the conveyor mat, drivingly having the conveyor mat round from the conveying track to the return guide. The return guide comprises a guiding envelope (E), linking up with the gear drive and extending along successive rows of modules, in which movement of the return part of the conveyor mat both sideways in the plane of the conveyor mat and transversely to the conveying plane is limited.