Land Roller Replaceable Chopping Blades with Weld-Bead Clearance
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Solution Overview
Problem
Existing land roller implements with chopping blades face issues in quick and easy replacement or sharpening due to interference from weld beads, leading to bolt shearing and the need for additional braces, which complicates installation and maintenance.
Innovation Solution
The design features blades with protruding and recessed portions that allow weld beads to align with recessed portions, enabling secure mounting without interference, and uses threaded fasteners to isolate bolts from shear forces, allowing for easy blade replacement and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the mounting flange is welded to the drum body at the leading face, then the blade is securely mounted, but the weld bead interferes with the blade abutment against the drum surface causing bolt shearing
Solution Approach 1:
The mounting flange is designed to extend in the axial direction of the drum body rather than only radially outward. This axial extension creates space between the weld bead and the blade abutment surface, allowing both the weld to secure the flange to the drum and the blade to abut against the drum surface without interference. The flange's three-dimensional configuration resolves the spatial conflict between welding and blade mounting.
2Reliability
If rear braces are added to support the mounting flange, then bolt shearing is prevented, but the device complexity increases
Solution Approach 1:
The invention extracts the essential function of preventing bolt shearing from the complex assembly of rear braces and mounting flanges. By extending the mounting flange axially, the design eliminates the need for separate rear brace components while still achieving bolt protection through the flange's own geometric configuration. This removes unnecessary structural elements and simplifies the overall mounting system.
3Reliability
If the blade is butted up against the outer peripheral surface of the drum, then the bolt is protected from shear forces, but the leading face of the mounting flange cannot be welded to the drum surface
Solution Approach 1:
The mounting flange is designed with axial extension into the drum body, creating a three-dimensional configuration that separates the welding zone from the blade abutment zone. This dimensional change allows the leading face of the flange to be welded to the drum surface while simultaneously providing a clear path for the blade to abut against the drum peripheral surface without weld bead interference. The axial depth of the flange provides the necessary spatial separation.
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 design ensures secure blade attachment without bolt shearing, simplifies maintenance by allowing quick replacement, and eliminates the need for rear braces, enhancing durability and efficiency.
Implementation Method 1
each mounting flange being welded to a peripheral surface of the drum body at a leading face of the mounting flange by a plurality of weld beads at respective weld locations spaced apart in the axial direction of the drum body
Data Source
AI summary
A land roller implement for chopping vegetation on the ground has one or more rollers including a drum body with mounting flanges protruding radially from the drum body onto which chopping blades can be fastened. The mounting flanges are fixed to the drum body with front weld beads that are spaced apart along the leading face of the mounting flanges. The blades are notched along the inner end to define recessed portions aligned with and receiving the front weld beads therein such that protruding portions at the inner end of the blades between the recessed portions are able to abut against the peripheral surface of the drum body without interference by the front weld beads. The bolts fastening the blades to the mounting flanges are thus isolated from shear forces by the abutting protruding portions while the mounting flanges remain secured against folding backward due to the presence of the front weld beads within the recessed portions.