Agricultural Mower Drum with Spiral Blades
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Solution Overview
Problem
Existing working drums in mowing machines suffer from plant wrapping, low material flow, excessive accumulation of cut mass, and impurities, leading to irregular overloads, poor cut quality, and reduced machine performance due to the lack of effective lifting and ejecting mechanisms.
Innovation Solution
A working drum design featuring a cylindrical or conical sidewall with spiral lifting blades and helical limiting blades, along with a detachable cover, ensures cut plants are lifted and ejected clockwise, preventing wrapping and improving material flow, while maintaining purity and reducing overloads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple cylindrical or conical metal sheet element is used as the drum sidewall, then the device complexity is reduced and ease of manufacture is improved, but the cut plants wrap on the drum and material flow is insufficient
Solution Approach 1:
Lifting blades are mounted on the drum surface to preliminarily elevate the cut plants before they can wrap around the drum. This preliminary lifting action prevents the wrapping problem while maintaining the simple cylindrical or conical sidewall structure for easy manufacture.
Solution Approach 2:
The solution adds a vertical dimension to the problem by introducing lifting blades that elevate plants in the vertical direction, rather than relying solely on the horizontal drum rotation. This dimensional addition prevents wrapping and improves material flow without complicating the basic drum structure.
2Reliability
If additional supporting elements are added to prevent plant wrapping, then the plant wrapping problem is reduced, but the device complexity increases
Solution Approach 1:
Lifting blades are mounted on the drum surface to preliminarily elevate the cut plants before they can wrap around the drum. This preliminary lifting action prevents the wrapping problem while maintaining the simple cylindrical or conical sidewall structure for easy manufacture.
Solution Approach 2:
The drum is designed with a cylindrical or conical curved surface that naturally guides plant flow. The curvature of the drum surface works in conjunction with the lifting blades to prevent wrapping while maintaining structural simplicity.
3Productivity
If the drum rotates to transport cut plants, then the material flow is improved, but excessive accumulation of cut mass occurs and impurities increase
Solution Approach 1:
A detachable cover is mounted on the drum to enclose the interior space. This cover extracts and isolates the drum interior from extraneous matter, preventing impurities from entering while allowing the drum to continue rotating for material flow.
Solution Approach 2:
The detachable cover acts as a flexible enclosure that seals the drum interior. This thin film-like structure prevents impurity entry while maintaining the rotational motion needed for material flow.
4Ease of manufacture
If the drum structure is simplified, then ease of manufacture is improved, but lifting capability is insufficient and plant wrapping occurs
Solution Approach 1:
Lifting blades are mounted on the drum surface to preliminarily elevate the cut plants before they can wrap around the drum. This preliminary lifting action prevents the wrapping problem while maintaining the simple cylindrical or conical sidewall structure for easy manufacture.
Solution Approach 2:
The drum is designed with a cylindrical or conical curved surface that naturally guides plant flow. The curvature of the drum surface works in conjunction with the lifting blades to prevent wrapping while maintaining structural simplicity.
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 design enhances material flow, reduces overloads, and improves cut quality by efficiently lifting and ejecting plants, leading to increased machine efficiency and crop purity, with controlled air whirl aiding in the drying process.
Implementation Method 1
The adjoining blade elements, which are arranged angularly and at respective heights, provide a whirl of air that advantageously affects the flow of the cut material
Data Source
AI summary
A mower working drum located on a cutting bar is mounted detachably to a hub and is provided at the bottom with cutting knives in a cutting disc, and above the disc is provided axially a drum sidewall. On the drum wall are provided ejecting elements. From the top, the drum has a cover provided detachably. Under the cover and between the ejecting elements mounted on the drum are limiting blades, and in the bottom section of the drum, in a counter-clockwise direction to the limiting blades mounted are lifting blades.