Segmented Stripping Arm for Disc Harrow Cutting Unit

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Solution Overview

Problem

Cutting units for disc harrows often experience blocking issues due to sticky soils, which existing designs fail to adequately address, leading to inefficiencies in soil preparation.

Innovation Solution

A cutting unit design featuring a smaller, elongated stripping arm with a flat or circular shape, arranged perpendicularly to the rotation axis, which maintains a minimum distance from the cutting blade to prevent soil accumulation, and is optionally rotatable and bent to enhance soil stripping efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a disc-shaped stripping device is used with inclination to the cutting blade, then the stripping capability is improved, but the distance between the disc and cutting blade is reduced causing blocking in sticky soils

Engineering Contradiction:

Improvestripping capabilityVSAvoidblocking of cutting blade

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The disc-shaped stripping device is segmented into multiple strip-shaped elements (first strip, second strip, third strip) arranged radially. This segmentation reduces the continuous contact surface between the stripping device and the cutting blade, preventing soil accumulation and blocking while maintaining effective stripping capability across the blade surface.

Inventive Principle:

Principle #1Segmentation

2Area of stationary object

If a large disc is used for stripping, then the stripping coverage is improved, but earth accumulation between the stripping device and cutting blade increases causing blocking

Engineering Contradiction:

Improvestripping coverageVSAvoidearth accumulation

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The large disc area is segmented into multiple narrow strip elements spaced apart radially. This provides extensive stripping coverage across the blade surface while the gaps between strips prevent earth accumulation, resolving the contradiction between coverage area and blocking prevention.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The stripping function is transitioned from a two-dimensional disc surface to a three-dimensional radial arrangement of spaced strips. This dimensional change allows coverage of the blade surface area while introducing radial spacing that prevents soil accumulation in the gaps between strips.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Productivity

If the stripping device is made large to cover the cutting blade, then the stripping efficiency is improved, but the distance to the cutting blade is reduced leading to blocking

Engineering Contradiction:

Improvestripping efficiencyVSAvoidblocking of cutting blade

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The stripping device is segmented into multiple radial strips that collectively cover the cutting blade surface efficiently. The segmentation maintains stripping efficiency through distributed contact points while preventing blocking by creating gaps that eliminate soil accumulation zones.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP2976933B9Cutting unit

Publication Date: 2017.09.13 KVERNELAND GRP LES LANDES GENUSSON

Figure 1~2
Figure 3~4
Figure 5~6

AI summary

A cutting unit (1) for a disc harrow and/or a seed coulter is proposed, having a cutting blade (2) rotatably mounted about a rotation axis (4), and a stripping device (3, 31) for stripping earth accumulated on the cutting blade (2), wherein the stripping device (3, 31) has at least one stripping arm (3, 31) rotatably mounted about the rotation axis (4).