Combine Harvester Sieve Jacket Oscillation for Grain Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing combine harvesters face limitations in the cleaning effectiveness of threshed harvested material, as the rotating cleaning principle relies primarily on centrifugal and gravitational forces, which can lead to incomplete separation of grain and non-grain components.
Innovation Solution
A combine harvester design that incorporates a cleaning device with a sieve jacket that rotates and oscillates simultaneously, applying centrifugal force and oscillating movements transverse to the rotational axis, enhancing the separation of grains from non-grain components by superimposing rotary and oscillating movements to optimize segregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rotating sieve device is used for cleaning harvested material, then the cleaning process can continuously segregate grain from non-grain components, but the separation effectiveness is limited due to reliance on centrifugal and gravitational forces only
Solution Approach 1:
The sieve jacket is transformed from a purely rotating structure to a dynamic structure that combines rotation with oscillation. The oscillation mechanism allows the sieve jacket to dynamically adjust its position, creating variable motion patterns that enhance separation effectiveness while maintaining continuous operation.
Solution Approach 2:
An oscillation mechanism is introduced to generate mechanical vibrations in the sieve jacket during rotation. These vibrations create pulsating forces that complement the centrifugal and gravitational forces, improving the breakdown and separation of harvested material components for more complete grain recovery.
2Productivity
If the sieve jacket rotates at high speed to increase cleaning throughput, then productivity improves, but the separation precision decreases due to excessive centrifugal force
Solution Approach 1:
The oscillation mechanism counteracts the excessive centrifugal force generated at high rotation speeds by creating opposing motion. This dynamic adjustment allows the system to maintain high throughput while preserving separation precision, as the oscillation creates variable force vectors that prevent grain loss.
Solution Approach 2:
The oscillation introduces periodic action to the rotating sieve jacket, creating cycles of high and low centrifugal force. This periodic variation in force allows for both high throughput during peak phases and precise separation during low-force phases, resolving the contradiction between speed and precision.
3Productivity
If only rotational movement is applied in the cleaning device, then the device structure remains simple, but the cleaning effectiveness is insufficient to fully separate grain from non-grain components
Solution Approach 1:
The oscillation mechanism is integrated into the existing rotating sieve device structure. By adding this dynamic component, the system achieves enhanced cleaning effectiveness through combined rotational and oscillating movements without requiring a complete redesign of the entire device architecture.
Solution Approach 2:
The oscillation mechanism is merged with the rotating sieve jacket structure, combining two motion types into a single integrated system. This merging allows the device to achieve superior cleaning effectiveness while minimizing the increase in overall structural complexity.
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 design significantly improves the cleaning effectiveness by using centrifugal force and oscillation-induced pulses to separate grains more efficiently, resulting in improved grain throughput and separation from non-grain components.
Implementation Method 1
the sieve device rotates about a rotational axis that runs in the driving direction of the combine, and hence orthogonal to the direction of gravity. the cleaning device performs an oscillating movement parallel to the rotational axis
Implementation Method 2
the cleaning device performs an oscillating movement parallel to the rotational axis
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 a separating the grain from the non-grain components. The cleaning device includes 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.