Conveyor Maintenance Interlock With Brake and Dual Access Doors
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Solution Overview
Problem
In article handling installations, maintenance operations are unsafe due to the risk of operators being unaware of conveyor movements, leading to potential injuries from moving elements, as operators may access maintenance areas without informing each other.
Innovation Solution
A conveyor system with a brake and manual safety actuator, controlled by a programmable control unit, which ensures the conveyor remains stationary if the secondary maintenance area door is open, preventing unauthorized access and ensuring operators are aware of all movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple maintenance doors are provided for different maintenance zones, then accessibility for maintenance operations is improved, but safety is worsened due to risk of unauthorized access and unexpected movements
Solution Approach 1:
The control unit receives signals from sensors monitoring door positions and lever positions, and automatically responds by controlling the brake and lock mechanisms. This closed-loop feedback system ensures that the conveyor remains stationary when maintenance doors are open, resolving the safety issue while maintaining accessibility.
Solution Approach 2:
The brake and lock mechanisms act as intermediaries between the door/lever positions and the conveyor movement. These safety intermediaries prevent direct coupling between maintenance access and conveyor operation, allowing both goals to coexist safely.
2Ease of operation
If the conveyor can be manually moved during maintenance, then ease of maintenance operation is improved, but safety is worsened due to risk of operator injury from unexpected movements
Solution Approach 1:
The brake is activated in advance before any manual movement of the conveyor can occur. The control unit monitors door and lever positions and pre-activates the brake and lock mechanisms to prevent any unexpected conveyor movement, eliminating the injury risk before it can materialize.
Solution Approach 2:
The brake and lock mechanisms provide preliminary anti-action by preventing conveyor movement before any potential harmful action can occur. This preemptive safety measure counteracts the potential danger of unexpected conveyor movement during maintenance operations.
3Ease of operation
If the brake is released for manual movement, then ease of conveyor manipulation is improved, but safety is worsened due to risk of uncontrolled movement
Solution Approach 1:
The control unit continuously monitors the position of maintenance doors and levers, and automatically controls the brake based on this feedback. When doors are closed or levers are in safe positions, the brake is released to allow manual movement. When doors are open, the brake is activated to prevent uncontrolled movement, thus maintaining both ease of manipulation and safety.
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
Enhances safety during maintenance operations by ensuring operators are aware of conveyor movements and preventing unauthorized access to potentially hazardous areas, thereby reducing the risk of injuries.
Implementation Method 1
A brake that can adopt a closed position in which it blocks the movement of the conveyor
Data Source
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AI summary
A facility (1) for handling articles (2, 3), comprising: - a conveyor (4); - a motorisation of the conveyor (4); - a brake (14) which blocks or releases the conveyor (4); - a secure manual actuator (38) connected to the brake (14); - a member (19) for manually driving the conveyor (4); - a structure (27) housing the conveyor (4) and comprising : o a main door (31) for access to a main maintenance area (29), o an annex door (32) for access to an annex maintenance area (30), o a housing (35) for a lever (21) for actuating the manual driving member (19); a control unit (18), programmed to control the locking of the annex door (32) depending on the position of the main door (31), the state of the secure manual actuator (38) and the presence of the lever (21) in its housing (35).