Segmented Sieve Jacket for Combine Harvester Cleaning
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Solution Overview
Problem
Existing combine harvesters face limitations in the cleaning efficiency of threshed material due to the reliance on rotating sieve devices, which may not effectively segregate grain from non-grain components, leading to suboptimal performance.
Innovation Solution
The implementation of a cleaning device that superimposes rotary and oscillating movements on a sieve jacket, with the oscillating movement directed transverse to the rotational axis, enhances the segregation process by utilizing centrifugal force and gravity, improving the separation of grains from non-grain components through the use of a sieve device with segmented peripheral segments that swing back-and-forth, optimizing the segregation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rotating sieve device is used for cleaning threshed material, then the cleaning process can be performed continuously, but the cleaning efficiency is insufficient and grain separation from non-grain components is not effective
Solution Approach 1:
The patent applies the dynamics principle by superimposing an oscillating movement on top of the rotational movement of the sieve device. The sieve device performs both a rotary movement about a vertical axis and an oscillating movement in a horizontal plane, creating complex dynamic trajectories for the threshed material. This combination of movements enhances the separation effectiveness by preventing material from settling into fixed patterns, thereby improving grain separation quality while maintaining continuous operation
Solution Approach 2:
The patent utilizes mechanical vibration through the oscillating movement component, where the sieve device executes periodic back-and-forth motions in addition to rotation. This vibration introduces variable accelerations and forces that improve the segregation of grain from non-grain components by enhancing the interaction between material particles and the sieve surface, thereby resolving the contradiction between continuous cleaning and effective separation
2Productivity
If a rotating sieve device operates without oscillating movement, then the device structure is simple, but the cleaning effectiveness is limited
Solution Approach 1:
The patent merges two types of motion (rotational movement and oscillating movement) into a single integrated sieve device operation. The device simultaneously performs rotary movement about a vertical axis and oscillating movement in a horizontal plane, combining the advantages of both motion types to achieve superior cleaning effectiveness without requiring separate devices for each function
Solution Approach 2:
The patent implements dynamics by making the sieve device perform multiple superimposed movements rather than a single fixed motion. The oscillating movement is superimposed on the rotational movement, creating a dynamic system that adapts its motion pattern to enhance separation effectiveness while maintaining a relatively simple overall device structure
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
This approach significantly improves the cleaning effectiveness by using oscillation-induced pulses counter to centrifugal force, ensuring grains are separated and discharged radially through sieve holes while non-grain components are removed by air streams, resulting in enhanced grain throughput and separation efficiency.
Implementation Method 1
The cleaning device is configured to segregate the harvested material, in particular by generating a rotary movement and an oscillating movement of the screening jacket
Implementation Method 2
segregation by the cleaning device is accomplished by generating a rotary movement and an oscillating movement of the screening jacket
Implementation Method 3
non-grain components are removed by air streams
Implementation Method 4
enhances the segregation process by utilizing centrifugal force and gravity
Data Source
AI summary
A combine harvester is disclosed with an infeed arrangement for receiving the harvested material, with a threshing device for degraining the harvested material, and with a cleaning device that is downstream from the threshing device for segregating the harvested material, and thereby separating the grain from the non-grain components. The cleaning device has a sieve device that can rotate about a rotational axis with an at least sectionally sieve-shaped sieve jacket that extends in a peripheral direction around the rotational axis. Separating the grain from the non-grain components is performed by the cleaning device by superimposing a rotary movement and oscillating movement of the sieve jacket such that the oscillating movement is directed transverse to the rotational axis of the sieve device, wherein the oscillating movement is caused by a segmentation of the sieve jacket in a peripheral direction, and a swinging of each peripheral segment of the sieve jacket about a pivot axis associated with the respective peripheral segment.