Harvester Sieve Roller Mounting to Reduce Wear and Maintenance
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Solution Overview
Problem
Existing harvesting machines have screening devices that are prone to wear and complex maintenance due to concave rollers and plastic seals, leading to increased costs and reduced durability.
Innovation Solution
The use of cylindrical rollers with radial cams and a complementary guide groove for mounting the frame, along with a belt holder and seal receptacle, provides a robust and simplified design that distributes forces evenly and eliminates the need for complex seals, allowing for efficient cleaning and reduced maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If concave rollers are used to guide the frame, then the frame can be mounted and guided, but the rollers are very susceptible to wear when absorbing radial forces
Solution Approach 1:
The patent inverts the traditional concave roller design by using convex rollers that work in conjunction with concave guide grooves in the frame. This reversal allows the frame's guide grooves to bear the radial loads instead of the rollers, while the rollers provide stable rotational support with their convex shape, significantly improving wear resistance and reliability.
2Adaptability or versatility
If an externally arranged seal with belt guide function is used, then sealing and belt guidance are provided, but the seal is made of plastic which is susceptible to wear and the structure becomes complex
Solution Approach 1:
The patent separates the sealing function from the belt guide function. The seal is positioned internally without external belt guide features, and the belt guidance is achieved through the structural design of the frame and roller arrangement. This segmentation simplifies the seal structure, reduces wear, and maintains both sealing and guidance functionalities.
Solution Approach 2:
The patent introduces an intermediary structural arrangement where the frame and roller system mediate between the seal and the belt. Instead of the seal directly guiding the belt, the mechanical interaction between the frame's guide grooves and the convex rollers provides belt guidance, allowing the seal to focus solely on its sealing function with a simpler, more durable design.
3Adaptability or versatility
If the frame is made complex to provide both sealing and belt guide functions, then both functions are achieved, but manufacturing costs increase and durability decreases
Solution Approach 1:
The patent divides the frame structure into distinct functional elements: the frame body provides sealing surfaces, while separate guide grooves and roller mounting points handle belt guidance. This segmentation allows each component to be optimized for its specific function, simplifying manufacturing processes and reducing overall complexity while maintaining multi-functionality.
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 enhances the durability and service life of the screening device by evenly distributing bearing forces, minimizing wear, and reducing maintenance costs while maintaining effective sealing and cleaning capabilities.
Implementation Method 1
a cooling fan for generating a cooling air flow. The cooling fan is arranged relative to the heat sink such that the cooling air flow generated by the cooling fan flows along the heat sink and/or flows through the heat sink
Implementation Method 2
a blower for generating a cleaning air stream and a cleaning head fluidly connected to the blower. The cleaning head is assigned to the sieve surface of the sieve device and is arranged so close to the sieve surface that dirt particles can be or are detached from the sieve surface by means of the cleaning air stream
Data Source
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AI summary
The present application relates to a self-propelled harvesting machine (1), in particular in the form of a forage harvester, comprising a drive motor (2), a cooling system (5) for cooling the drive motor (2), the cooling system (5) comprising a housing (9), a heat sink (6), a cooling fan (7), a sieve device (8) arranged upstream of the heat sink (6) and mounted on the housing (9), wherein the sieve device (8) has a rotationally symmetrical frame (3) and a planar sieve element (4) stretched on the frame (3), wherein the sieve device (8) comprises a plurality of rollers (10) rotatable about an axis of rotation (11), by means of which the frame (3) is rotatably mounted on the housing (9) about an axis of symmetry (12) of the frame (3).In order to provide a harvesting machine whose sieving device is simpler and more robust than in the prior art, it is proposed according to the invention that the rollers (10) have a cylindrical running surface (13) and a cam (14) rotationally symmetrical with respect to the axis of rotation (11) of the respective roller (10), which projects radially outwards with respect to the axis of rotation (11) of the respective roller (10) over the cylindrical running surface (13), wherein the frame (3) has a guide groove (15) complementary to the cams (14).