Scraper Hinge Geometry for Deflected Disk Blade Contact
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Solution Overview
Problem
Existing disk blade scraper designs fail to maintain contact with deflected disk blades, leading to soil adherence and plugging, especially in angled configurations, and result in increased wear and component breakage when using greater spring force or jack bolts to address the issue.
Innovation Solution
A scraper assembly with a hinge that pivotally interconnects the scraper blade with a mount, where the hinge's axis of rotation lies tangent to the disk blade hub's perimeter, allowing the scraper to follow the deflected disk blade's contour and maintain contact, reducing plugging and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If greater spring force or jack bolts are used to force contact between scraper and blade, then contact is maintained, but wear increases, component breakage occurs, and disk blade stoppage happens in loose, dry soil
Solution Approach 1:
The scraper assembly is designed with a hinge that allows it to dynamically adjust its position and angle relative to the disk blade. This dynamic configuration enables the scraper to automatically follow the blade's deflected shape during operation, maintaining contact without requiring excessive spring force or jack bolts, thereby reducing wear and component breakage.
Solution Approach 2:
The invention changes the geometric parameters of the scraper assembly, specifically positioning the hinge axis of rotation to lie generally tangent to the perimeter of the disk blade hub. This parameter change allows the scraper to naturally conform to the blade's deflected shape, maintaining contact while reducing the forces required.
2Device complexity
If traditional scraper designs are used, then structure is simple, but they only match the disk blade shape in one condition (flat blade without soil pressure loading) and fail to maintain contact when the blade is deflected
Solution Approach 1:
The scraper assembly incorporates a hinge that enables dynamic adjustment of the scraper blade's angle and position. This allows the scraper to adapt to the disk blade's deflected shape during operation, maintaining contact reliability without significantly increasing structural complexity.
Solution Approach 2:
The hinge mechanism introduces an additional degree of freedom to the scraper assembly, allowing it to move in a dimension that accommodates the blade's deflection. This dimensional change enables the scraper to follow the blade's contour while maintaining a relatively simple overall structure.
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 plugging and wear by maintaining contact with the disk blade, allowing the scraper to closely follow its deflected shape, and is self-clearing of plugs, with lower spring force requirements for extended component life.
Implementation Method 1
a hinge pivotally interconnecting the scraper blade with the mount. The hinge has an axis of rotation
Data Source
AI summary
An agricultural machine includes a disk blade assembly having a hub and a disk blade mounted to the hub. The hub has a perimeter. The disk blade is deflectable by ground forces in an area outside of the hub. A scraper assembly includes a mount, a scraper blade, and a hinge pivotally interconnecting the scraper blade with the mount. The hinge has an axis of rotation which passes through a point generally at or near a bottom of the hub perimeter, and generally coincident with the disk blade.