Freely Rotatable Cutting Device for Harvesting Machines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Harvesting machines, such as balers and loading wagons, face high maintenance costs and downtimes due to the wear and damage of cutting devices with knives arranged within the crop channel, which are dependent on conveying speed for cutting efficiency.
Innovation Solution
A cutting device with freely rotatable, drivable cutting elements that interact with a shearbar, allowing for independent cutting speed and reduced maintenance needs, integrated into the harvesting machine with a conveying rotor, enabling longer service life and adjustable cutting forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cutting elements are arranged within the crop channel and interact with a shearbar, then cutting quality is improved, but maintenance effort and costs increase due to wear and damage
Solution Approach 1:
The cutting device is mounted so as to be freely rotatable about an axis of rotation and is designed to be drivable, enabling the cutting elements to rotate independently of the conveying rotor. This dynamic mounting allows the cutting elements to maintain optimal cutting angles and speeds while reducing wear on both the cutting elements and shearbar, thereby extending service life and reducing maintenance effort.
2Device complexity
If passive knives are used that only protrude into the crop channel, then device complexity is reduced, but cutting speed is limited by conveying speed
Solution Approach 1:
The cutting device is designed to be freely rotatable and drivable, allowing it to rotate at speeds independent of the conveying rotor. This enables the cutting elements to achieve significantly higher cutting speeds relative to the crop, improving cutting performance without requiring complex fixed mechanisms.
Solution Approach 2:
The cutting device combines rotational movement with cutting action, merging the functions of rotation and cutting into a single drivable unit. This integration allows the cutting elements to move through the crop at high speeds while maintaining the simplicity of a unified device structure.
3Manufacturing precision
If cutting elements operate with high sharpness, then cutting quality is improved, but service life is reduced due to faster wear
Solution Approach 1:
The freely rotatable cutting device operates at high cutting speeds independent of conveying speed. At these high speeds, the cutting elements maintain effective cutting action even with reduced sharpness levels, allowing them to be used longer before regrinding or replacement is necessary, thus extending service life while maintaining cutting quality.
Data Source
Figure 1~2
Figure 3
AI summary
A harvesting machine (10), in particular a baler or forage wagon, with a cutting device (30) for agricultural crops, has a cutting device (30) with a plurality of cutting elements (32) each acting in a cutting plane (44), wherein the cutting elements (32) are arranged side by side with respect to a crop flow channel (18) through which crops flow and, during operation of the cutting device (30), project at least partially into the crop flow channel (18) through a crop guide element (28) provided with recesses (46) and cooperate with a counter blade (48) to chop the crop, and a driveable conveying rotor (20) for conveying the crop. According to the invention, the cutting device (30) is mounted to rotate freely about an axis of rotation (38) and is designed to be driveable.