Boundary Diffuser for Twin-Disc Spreader Edge Distribution
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Solution Overview
Problem
Existing two-disc spreaders face challenges in achieving uniform lateral distribution at the field edge during border spreading, often resulting in undersupply or oversupply of material, due to insufficiently steep spreading patterns and complex handling requirements for adjusting throwing vanes or discs.
Innovation Solution
The border spreading device features main guide surfaces that extend obliquely outward from the distributor discs at an angle of up to 30°, with through-openings to allow material to pass through, ensuring a steep edge spread pattern without over-spreading beyond the field edge, and includes adjustable passage openings for optimal distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the distribution disc is equipped with throwing vanes to distribute material, then the material can be spread over a wide area, but the spreading pattern becomes flat-sided which causes insufficient fertilization at the field boundary
Solution Approach 1:
The boundary spreading device is segmented into multiple guide surfaces (first guide surface, second guide surface, third guide surface) with different orientations and functions. The first guide surface creates the boundary, the second guide surface shapes the spreading pattern, and the third guide surface controls material flow, allowing precise control of the spreading pattern to achieve steep-sided distribution at the field boundary
Solution Approach 2:
The boundary spreading device acts as an intermediary element between the distribution disc and the field boundary. It intercepts material thrown by the distribution disc and redirects it to create a steep-sided spreading pattern, preventing both undersupply at the boundary and over-spreading beyond the field edge
2Area of stationary object
If the spreading pattern is extended to the field boundary, then coverage is achieved, but material is thrown over the boundary causing fertilizer losses
Solution Approach 1:
The boundary spreading device applies preliminary anti-action by creating a steep-sided spreading pattern that abruptly stops material flow at the field boundary. The guide surfaces are positioned and oriented to prevent material from being thrown beyond the boundary before it can cause fertilizer losses, while still achieving full coverage up to the boundary
3Manufacturing precision
If throwing vanes or discs are adjusted to achieve boundary spreading, then spreading pattern improves, but handling becomes time-consuming and cumbersome
Solution Approach 1:
The boundary spreading device is designed as a self-adjusting mechanism that automatically adapts to different spreading conditions. The guide surfaces are positioned to automatically create the correct spreading pattern without requiring manual adjustment of throwing vanes or discs, making the system easy to operate while maintaining precise spreading control
Data Source
AI summary
A twin-disc spreader is proposed with two distributor discs (3a, 3b) driven in opposite directions about parallel axes (A1, A2) and with a boundary spreading device (10), which in its operating position is arranged centrally between the distributor discs and has two vertically arranged main guide surfaces (11) which diverge symmetrically to the longitudinal axis of the twin-disc spreader from a point (P1) arranged between the distributor discs obliquely outwards and - viewed in the longitudinal direction of the twin-disc spreader - away from the distributor discs.The invention provides, on the one hand, that each main guide surface extends obliquely outwards and – viewed longitudinally – from each distributor disc up to a point (P2), the imaginary horizontal connecting line (L1) of which intersects the axis of rotation of the respective distributor disc with an imaginary horizontal line (L2) extending longitudinally and intersecting the respective axis of rotation, forming an angle (Ν) of at most 30°. On the other hand, the main guide surfaces have through-openings that are arranged symmetrically at a distance from the end of the respective main guide surface furthest from the twin-disc spreader and with respect to the longitudinal axis of the twin-disc spreader.