Telescoping Conveyor Operator Safety Control Logic
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Solution Overview
Problem
Telescoping conveyors pose a risk of operator injury due to the potential for hands or fingers to be squeezed between boom sections during retraction, as the design can create a shear hazard at certain pinch points.
Innovation Solution
Incorporating control switches at multiple locations and a controller that imposes a change in operator control when a predefined degree of retraction is reached, requiring the operator to position themselves away from the hazard, ensuring safety during continued retraction by either enabling simultaneous operation of switches on both sides of the boom section or disabling local controls and requiring operation from a safer distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the telescoping conveyor allows continuous retraction operation with standard controls, then productivity is maintained, but operator safety is compromised due to potential hand or finger squeezing between boom sections
Solution Approach 1:
The control system dynamically changes its behavior based on the retraction state. When the boom sections reach a predefined degree of retraction, the control switches automatically change from allowing operation from any location to requiring operation from a safe location only. This dynamic adaptation resolves the contradiction by maintaining productivity through automated control while ensuring safety when the hazard zone is approached.
Solution Approach 2:
The system incorporates feedback through control switches that detect the position of the boom sections and automatically adjust the operational requirements. When sensors detect that the predefined retraction degree is reached, the feedback mechanism triggers a change in control mode, requiring operators to use safe-location switches only. This feedback loop ensures safety without permanently reducing productivity.
2Ease of operation
If control switches are made accessible at all locations for ease of operation, then ease of operation is improved, but operator safety deteriorates due to proximity to hazard zones
Solution Approach 1:
The accessibility of control switches is dynamically adjusted based on the retraction state. During initial retraction phases, controls remain accessible at all locations for ease of operation. When the predefined retraction degree is reached, the system dynamically restricts operational accessibility to safe-location switches only, eliminating exposure to the hazard zone while maintaining operational capability.
Solution Approach 2:
The control system acts as an intermediary between the operator and the hazard zone. By implementing location-based control logic, the system mediates operator access to controls, automatically preventing operation from hazardous locations while allowing operation from safe locations. This intermediary function resolves the contradiction by maintaining ease of operation through automated safety enforcement.
Data Source
AI summary
A telescoping conveyor includes a base section and one or more boom sections mounted on the base section and operable to be telescopically extended and retracted in relation to the base section. Control switches are located at multiple locations to enable operator control to extend or retract the one or more boom sections. The telescoping conveyor is configured such that, during a retraction operation, when a predefined degree of retraction is reached, a change in operator control is imposed to enable an operator to continue retraction of the one or more boom sections. The changed operator control requires the operator to be positioned away from a location of a potential hazard during the continued retraction operation.