Combine Harvester Straw Spreader with Adjustable Guide Plates
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Solution Overview
Problem
Existing crop distribution devices for combine harvesters face challenges in achieving large spreading widths while ensuring homogeneous distribution of harvested crops on the field soil, with existing systems either losing kinetic energy due to friction or delivering crops unevenly due to centrifugal forces.
Innovation Solution
A crop distribution device equipped with an ejection hood featuring a combination of stationary guide plates and rotating blowers, where the guide plates are adjustable and designed to impart additional kinetic energy, ensuring large distribution widths and homogeneous material distribution by varying curvature and positioning of guide plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed guide plates are used in the ejection hood, then the structure is simple, but the distribution width is limited and kinetic energy is lost due to friction
Solution Approach 1:
The patent replaces fixed guide plates with rotating blowers that can be adjusted in position and orientation. This dynamic configuration allows the system to achieve larger distribution widths by optimizing the interaction between the crop stream and the rotating elements, thereby reducing kinetic energy loss while maintaining structural manageability.
Solution Approach 2:
The patent introduces adjustable parameters for the blowers, including their position, rotation speed, and orientation. By varying these parameters, the system can adapt to different distribution width requirements and optimize kinetic energy transfer to the crop stream, resolving the contradiction between structural simplicity and distribution capability.
2Area of stationary object
If rotating distribution devices are used, then large distribution width is achieved, but crop distribution becomes uneven due to centrifugal forces
Solution Approach 1:
The patent employs multiple blowers with different rotation directions and speeds positioned at various locations within the ejection hood. This creates locally optimized flow patterns where inner and outer regions receive appropriately adjusted centrifugal forces, ensuring uniform crop distribution across the entire field width while maintaining large distribution capability.
Solution Approach 2:
The patent uses asymmetric configuration of blowers with different rotation directions (some clockwise, some counter-clockwise) and varying speeds. This asymmetric design compensates for the uneven distribution effects of centrifugal forces by creating counterbalancing flow patterns that achieve overall uniformity across the distribution width.
3Area of stationary object
If multiple rotating distribution devices are arranged next to one another, then coverage is increased, but middle areas receive excessive crop deposition
Solution Approach 1:
The patent uses dynamically adjustable blowers that can be independently controlled in position and speed. This allows the system to adapt the contribution of each blower to the overall distribution pattern, preventing excessive deposition in middle areas while maintaining comprehensive coverage through coordinated operation of multiple devices.
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
The solution enables reliable implementation of large distribution widths with uniform crop distribution across the field, preventing crop accumulation and ensuring even distribution on both sides and in central areas.
Implementation Method 1
The rotating distribution devices accommodate a large number of curved distribution elements, which take over the material flow conveyed from the straw chopper, accelerate it and distribute it widely on the field soil depending on the centrifugal forces acting on it.
Implementation Method 2
the distribution width that can be achieved essentially depends on the kinetic energy supplied to the crop stream in the straw chopper and the blower
Data Source
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AI summary
The device (10) has an ejector hood (14) assembled at an inner side with goods conveying elements (18). The device is filled with a crop material (32) in a rear region. The crop material is delivered to a straw chopper and a purification apparatus. The elements are designed as a combination of stationary baffle plates (20-26) and a rotating discharge blower (19). The baffle plates are arranged in a middle region (27) of the ejector hood and connected together. The blower is associated with two of the baffle plates in a right side region (28) and a left side region (29) of the ejector hood.