Deflectable Impeller Blades for Soil Spreading Scraper
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Solution Overview
Problem
Conventional soil-spreading ditchers face issues with blade damage from debris and require blade replacement after impact, leading to inefficiencies and additional damage to other components.
Innovation Solution
A soil spreading scraper device with a deflectable impeller disc blade system, where each impeller blade is pivotal and supported by an actuating assembly that resists displacement until a prescribed holding force is exceeded, allowing the blade to deflect and reduce damage from debris, and a spring biases the blade back to its working position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If impeller blades are fixed rigidly to the disc body, then the blade maintains its working position and spreading function, but the blade suffers considerable damage upon impact with rocks and debris
Solution Approach 1:
The impeller blade is made dynamically adjustable through a pivot mechanism that allows it to transition between a working position (extending radially outward for soil spreading) and a deflected position (swinging backward upon impact). The actuating assembly with spring biasing enables the blade to automatically adjust its orientation based on operational conditions, resolving the contradiction between maintaining spreading function and resisting damage.
2Reliability
If shear pins are used to fasten blades to the disc, then blade damage is minimized upon impact, but the blade becomes non-functional until the shear pin is replaced and the blade may cause further damage while swinging
Solution Approach 1:
Instead of using shear pins that fail completely, the invention employs a pivot mechanism with actuating assembly that allows continuous operation. The blade can dynamically swing to a deflected position during impact and automatically return to its working position when the harmful force ceases, eliminating the need for replacement and preventing further damage to other components.
Solution Approach 2:
The actuating assembly with spring biasing enables the blade to automatically return to its working position after deflection without external intervention. The system self-corrects after impact, maintaining operational continuity and eliminating the need for manual replacement of fastening elements.
3Reliability
If the blade pivot axis is oriented parallel to the disc axis of rotation, then the blade can swing freely upon impact, but the blade body bites into the main disc body in a twisting motion causing unnecessary damage
Solution Approach 1:
The pivot axis is deliberately oriented perpendicular to the disc axis of rotation, creating an asymmetric configuration that prevents the blade from biting into the disc body during swing motion. This specific geometric arrangement ensures that the blade swings in a controlled arc without engaging the disc body, eliminating the twisting motion that causes damage while maintaining impact protection.
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 minimizes blade damage and reduces the need for frequent replacements, maintaining device efficiency and preventing further damage to other components by allowing blades to pivot and return to their operational position.
Implementation Method 1
a spring arranged to bias the paddle back towards the working position throughout the full range of motion of the paddle
Data Source
AI summary
A soil spreading scraper device has a cutting blade to cut soil from the ground and a rotating impeller member for spreading the cut soil as the frame is displaced forwardly. The impeller member includes a main disc body and a plurality of impeller blades on the main disc body which are pivotal relative to the body between a working position in which the blade body extends in a direction of the impeller axis away from the main disc body and a deflected position in which the blade body extends in a circumferential direction of the disc body in a trailing relationship relative to the pivot axis of the blade body. An actuating assembly resists displacement of the blade body into the deflected position until pressure on the paddle exceeds a prescribed holding force. A spring biases the body to return to the working position.