Selectable Pivoting Knives for Compact Crop Cutting
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Solution Overview
Problem
Existing crop cutting devices in agricultural machines face challenges such as mechanical complexity, high maintenance requirements, and inefficiency in knife selection and protection, particularly in dusty environments, leading to potential failure and increased operational costs.
Innovation Solution
A crop cutting device with a simple, lightweight design featuring pivotable knives, a selector mechanism, and a lifting mechanism using an elongate element and rotatable shaft, allowing for remote control and easy maintenance, with operating units supported by pivot axes and biasing elements for safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a common moveable actuator is used to pivot multiple knives, then the device can control multiple knives, but the mechanical complexity and acting forces increase
Solution Approach 1:
The cutting device is divided into independent knife units, each with its own operating unit and biasing element. This segmentation allows individual control of each knife without requiring a complex common actuator system, reducing overall mechanical complexity while maintaining the ability to select and control multiple knives independently
Solution Approach 2:
Each knife unit is designed as a universal module that can be independently activated or deactivated. The operating units with biasing elements provide multi-functional capability, allowing the same basic mechanism to control multiple knives through selective engagement, thereby achieving versatility without proportionally increasing complexity
2Volume of moving object
If knives are completely hidden under the crop inlet channel in retracted position, then installation space is reduced, but maintenance and replacement become inaccessible
Solution Approach 1:
The knife units are designed with dynamic positioning capability, allowing them to move between a retracted position (reducing installation space) and an extended operating position. The operating units can be selectively positioned to provide maintenance access when needed, while maintaining compact storage space when not in use
Solution Approach 2:
The operating units with biasing elements serve as intermediaries between the knife units and the operator. These operating units can be manually or automatically actuated to extend knife units for maintenance or retraction for space saving, providing a mediating mechanism that reconciles the conflicting requirements of space efficiency and maintenance accessibility
3Adaptability or versatility
If spring-loaded arms are repeatedly disengaged and re-engaged in dusty environments, then knife selection is possible, but the device becomes prone to failure
Solution Approach 1:
The biasing elements are designed to automatically return operating units to their default position after engagement or disengagement. This self-service capability eliminates the need for complex return-spring mechanisms or additional actuation steps, reducing the number of repeated engagement-disengagement cycles and thereby improving reliability in dusty environments
Solution Approach 2:
The patent replaces traditional spring-loaded arm mechanisms with operating units that utilize biasing elements in a simplified configuration. This substitution reduces the mechanical complexity of the selection mechanism, minimizing the number of moving parts that could fail in dusty conditions while maintaining the ability to selectively engage and disengage knife units
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
Enables smooth, safe, and remotely controllable knife selection, reducing installation space and ensuring reliable cutting functions even in dusty conditions, while being cost-effective and easy to maintain.
Implementation Method 1
each being associated with a biasing element, in particular a spring element
Data Source
Figure 1~2
Figure 3~5
AI summary
The present invention provides a crop cutting device (1) comprising a crop guiding surface (3), a plurality of knives (5) arranged side-by-side, wherein each knife (5) is pivotable about a knife axis (7) between a retracted inoperative position. The crop cutting device further comprises a plurality of operating units (11) in parallel to the plurality of knives (5). The crop cutting device comprises a selector mechanism (13) configured to selectively engage one or more of the plurality of operating units (11), wherein the selector mechanism (13) includes a rotatable shaft (17) comprising a plurality of engagement elements (19) configured to engage with the respective operating unit (11). The operating units (11) are movable between a disengaged position and an engaged position by a lifting mechanism (23) comprising an elongate element extending between a first side and a second side of a main frame (21).