Grinding Device Abrasive Holder Threaded Spindle Jamming
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Solution Overview
Problem
Existing grinding devices for agricultural harvesting machines are prone to jamming and require high maintenance due to external threads being damaged by dirt and crop residues, leading to unreliable abrasive movement and increased care efforts.
Innovation Solution
A grinding device with an abrasive holder that moves relative to a threaded spindle, allowing for rotational and translational adjustment without direct engagement with the adjusting wheel, reducing the risk of jamming and incorporating a hood for protection against contamination, enabling precise positioning and extended abrasive life without manual relocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an external thread on the abrasive holder is used to move the abrasive, then precise adjustment is achieved, but the thread is damaged and jammed by dirt and crop residues
Solution Approach 1:
The invention extracts the threading mechanism from the abrasive holder and relocates it to a separate threaded spindle. The abrasive holder is now thread-free, eliminating the vulnerability to contamination. The threaded spindle remains protected or is designed to be replaceable, separating the function of precise movement from the component exposed to the harsh environment.
Solution Approach 2:
The invention introduces a threaded spindle as an intermediary component between the adjustment mechanism and the abrasive holder. This mediator performs the precise positioning function through its thread, while the abrasive holder itself remains simple and contamination-resistant. The intermediary absorbs the complexity and vulnerability of the threading mechanism.
2Ease of operation
If the abrasive holder is moved via an external thread, then adjustment is possible, but high maintenance and care costs occur
Solution Approach 1:
The threading mechanism is extracted from the abrasive holder and placed in a dedicated threaded spindle. This separation means that maintenance issues affect the spindle rather than the abrasive holder, and the holder itself becomes simpler and more durable, reducing overall maintenance requirements.
Solution Approach 2:
The threaded spindle can be designed as a replaceable, lower-cost component compared to an integrated threaded abrasive holder. If the spindle becomes contaminated or damaged, it can be replaced without replacing the entire abrasive holder assembly, reducing maintenance costs.
3Manufacturing precision
If the abrasive holder engages directly with the adjustment wheel via thread, then positioning is achieved, but jamming occurs due to contamination
Solution Approach 1:
The threading engagement is extracted from the interface between the abrasive holder and adjustment wheel. The abrasive holder no longer has threads that can accumulate crop residues and dirt. The threaded spindle serves as the engagement point, separating the positioning function from the contamination-prone environment.
Solution Approach 2:
The threaded spindle acts as an intermediary between the adjustment wheel and the abrasive holder. It provides the threaded engagement necessary for precise positioning while being structurally stronger and more resistant to contamination than a thin-walled abrasive holder could provide.
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 enhances the reliability and longevity of the grinding device, allowing for approximately 2,200 grinding cycles without manual intervention, reduces maintenance needs, and ensures efficient sharpening of cutting blades by minimizing contamination risks and optimizing abrasive usage.
Implementation Method 1
the transport unit has a threaded spindle relative to which the abrasive holder can be rotated and moved translationally by rotating it in the adjustment direction
Data Source
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AI summary
Grinding device (2) for an agricultural harvesting machine for sharpening at least one cutting blade having a cutting edge, which is arranged along the circumference of a rotatably driven cutting blade carrier, wherein the grinding device (2) comprises a transport unit (8) with a transport carriage (10) and in the transport carriage (10) an adjusting wheel (12) rotatable relative to the transport carriage (10) with a guide section is arranged in which an abrasive holder (16) with an abrasive (18) fixed therein is movably arranged, wherein the abrasive holder (16) is slidably mounted relative to the adjusting wheel (12) in an adjustment direction (53) and the transport unit (8) has a threaded spindle (20) relative to which the abrasive holder (16) is rotatable and translationally movable by rotating it in the adjustment direction (53).