Adjustable Vane System with Flat Bases for Axial-Flow Rotor Housing
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Solution Overview
Problem
Existing adjustable vane systems in axial-flow rotary combines face issues with gap formation and operational difficulty due to angular movement, which affects material flow and increases straw damage during the threshing and separating process.
Innovation Solution
An adjustable vane system with flat bases and pivot connections, allowing for angular adjustment without compromising the cylindrical shape of the housing cover, enabling easy movement and effective sealing, and allowing the vanes to be adjusted to skip helical passes, reducing straw damage and grain loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the angle of the vanes is adjusted to control material flow rate, then the throughput of crop material can be varied, but gaps form between the vanes and the curved housing wall
Solution Approach 1:
The housing wall in the separating section is designed with a curved surface having a specific radius of curvature. The adjustable vanes are configured with curved surfaces that conform to this radius, ensuring continuous contact and sealing between the vanes and the housing wall throughout the adjusting range. This curvature matching eliminates gaps that would otherwise form when vanes are angularly adjusted.
2Loss of substance
If the angle of the vanes is changed to reduce grain loss, then the feed rate can be reduced, but the vanes no longer conform to the curved wall and gaps occur
Solution Approach 1:
The curved surface design of both the housing wall and the adjustable vanes ensures that as the vanes are rotated to different angles, their outer surfaces continuously conform to the curved housing wall. This maintains proper sealing and prevents crop material from becoming trapped in gaps, making the adjustment operation smooth and reliable throughout the entire adjusting range.
3Productivity
If adjustable vanes are used to control axial progression of crop material, then threshing and separating efficiency can be optimized, but the cylindrical shape of the separating section cover is significantly changed
Solution Approach 1:
The curved surface with matched radius of curvature is applied specifically to the separating section of the housing where the adjustable vanes are located. This localized curvature design allows the vanes to adjust their angle for optimizing threshing and separating efficiency while maintaining the overall cylindrical shape and flow characteristics of the separating section cover.
Data Source
AI summary
An adjustable vane system for an axial-flow, rotary combine housing that incorporates at least one flat wall section as part of the otherwise cylindrical or oblong, curved housing cover, and adjustable vanes having flat bases that are angularly adjusted on the surface of the flat wall section. The housing includes fixed vanes on a curved portion of the housing cover that have a lead ends, in a direction of circumferential crop movement, substantially in registry with trailing ends of the adjustable vanes. The adjustable vanes include pivot connections near the trailing ends and swing connections near the lead ends of the adjustable vanes. All of the adjustable vanes are gang together and moved together. A mechanism is provided to swing the adjustable vanes from a position corresponding to the normal helical path of the fixed vanes to a bypass position wherein crop flow through the adjustable vanes will skip one or more passes between the fixed vanes on the next pass through the fixed vanes.