Harvester Processing Device Safety Interlock
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Solution Overview
Problem
Agricultural harvesters face challenges in protecting human operators and reducing the risk of damage to harvester parts during maintenance, particularly when shifting processing devices between operational and non-operational positions, as existing solutions do not adequately ensure safety and efficiency in these transitions.
Innovation Solution
The implementation of a system with a conveying device, processing device actuator, movable cover, and cover position sensor, which allows the processing device to move from a processing position to a central remote position and then laterally to a remote position, only if the cover is in an access-enabling position, preventing accidental contact and enabling automated and safe maintenance without manual handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the processing device is shifted laterally into a non-processing position for maintenance, then accessibility for maintenance is improved, but the risk of accidental contact with moving parts increases
Solution Approach 1:
The system performs preliminary safety verification by checking the cover position sensor status before enabling lateral movement of the processing device. The control unit verifies that the cover is in the closed position (indicating the chamber is clear) before allowing the actuator to shift the processing device into the maintenance position, thereby preventing accidental contact with moving parts.
Solution Approach 2:
The system uses a cover position sensor to provide continuous feedback about the cover state to the control unit. This feedback mechanism ensures that the processing device can only be moved laterally when the sensor confirms the cover is properly closed, creating a safety interlock that prevents movement under hazardous conditions.
2Device complexity
If the processing device is moved manually into a non-processing position, then device complexity is reduced, but ergonomic strain on operators increases
Solution Approach 1:
The system enables self-service maintenance by allowing operators to easily trigger automated lateral movement of the processing device through a user interface. The actuator automatically performs the heavy lifting and positioning work, eliminating the need for operators to manually handle heavy components while maintaining simple operation through automated control.
Solution Approach 2:
The manual mechanical effort required to shift the processing device is replaced by an automated actuator system controlled by the control unit. This substitution eliminates the need for operators to physically move heavy processing devices, reducing ergonomic strain while maintaining system accessibility for maintenance.
3Device complexity
If the cover position sensor is not integrated into the control system, then device complexity is reduced, but operator safety deteriorates
Solution Approach 1:
The cover position sensor provides critical safety feedback to the control unit, which monitors the sensor status and automatically prevents lateral movement of the processing device when the cover is not properly positioned. This feedback loop creates an automated safety interlock that protects operators without requiring complex additional safety systems.
Solution Approach 2:
The control unit acts as an intermediary between the cover position sensor and the processing device actuator. It receives safety information from the sensor and mediates the movement command, allowing or blocking lateral movement based on the cover position. This intermediary function ensures safety while maintaining relatively simple system architecture.
4Productivity
If the processing device moves without cover position verification, then productivity is improved by eliminating verification steps, but reliability deteriorates
Solution Approach 1:
The system performs a quick preliminary verification of the cover position sensor status before enabling processing device movement. This preliminary check is automatically and rapidly executed by the control unit, ensuring safety conditions are met before allowing maintenance operations to proceed, thus maintaining both speed and reliability.
Solution Approach 2:
The cover position sensor provides immediate feedback to the control unit, which automatically determines whether movement is safe. This rapid feedback mechanism enables the system to verify safety conditions and enable movement in a streamlined manner, maintaining productivity while ensuring reliability through automated safety verification.
Data Source
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AI summary
The conveying device of an agricultural harvester conveys crop material through a feeding channel. A processing device (18.1, ...) engages into the feeding channel. A processing device actuator (33.1, 33.r) can move the processing device (18.1, ...) with respect to the conveying device from an aligned position into a lateral remote position. A cover position sensor (50.1, 50.r, 52.1, 52.r) checks if a cover (40.1, 40.r) is currently in an opened or in a closed position. The movement of the processing device (18.1, ...) is automatically inhibited when the cover (40.1, 40.r) is in the closed position. Thereby it is inhibited that the moved processing device (18.1, ...) hits the cover (40.L, 40.R).