Electric Interlock for Spreader Safety
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Solution Overview
Problem
Existing material spreader safety systems primarily focus on hydraulic systems and do not effectively address safety concerns when electric systems are used, as they do not prevent door opening during operation, potentially leading to operator injury from rotating components.
Innovation Solution
An electric interlock mechanism that adjusts between conditions allowing or preventing electricity supply to the material transfer member, ensuring the door cannot be opened while the spreader is in operation and can be opened once the spreader is stopped, thereby preventing accidental contact with rotating parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulic safety system is used to stop the flow of hydraulic fluid when a door is opened, then the auger can be disabled to prevent operator injury, but the system does not effectively prevent door opening during operation and is not suitable for electric systems
Solution Approach 1:
The patent replaces the hydraulic safety system with an electric interlock mechanism. The electric interlock uses electrical components (switch, circuit) to detect door position and control power supply to the material transfer member, substituting the hydraulic fluid flow control mechanism with an electrical control system that is more suitable for modern electric-powered spreaders.
Solution Approach 2:
The patent introduces an electric interlock mechanism as an intermediary between the door and the material transfer member. This intermediary component (comprising a switch and circuit) mediates the relationship by detecting door opening status and automatically controlling the power supply, providing a more direct and reliable safety function than hydraulic systems.
2Reliability
If the door is prevented from opening during operation through interlock mechanisms, then operator safety is improved, but the complexity of the device increases
Solution Approach 1:
The patent extracts the safety function from the main operational system by implementing a separate, dedicated electric interlock mechanism. The interlock consists of a simple switch mounted on the door and associated circuit wiring, which is a minimal added complexity compared to the entire spreader system, yet provides effective safety protection.
3Productivity
If the electric supply line is continuously connected to operate the material transfer member, then operational efficiency is maintained, but the door can be opened inadvertently causing safety hazards
Solution Approach 1:
The patent implements a feedback mechanism where the electric interlock continuously monitors door position through a switch and automatically adjusts the power supply state accordingly. When the door is closed, power is supplied for normal operation; when the door opens, power is automatically cut off, creating a closed-loop safety system that responds to door position changes.
Data Source
AI summary
A material spreader may include an electric interlock mechanism that is adjustable between: (1) a first condition where an electric supply line can supply electricity to operate a material transfer member and a door cannot be moved into an open position; and, (2) a second condition where the electric supply line cannot supply electricity to operate the material transfer member and the door can be moved into an open position.