Ladder Control System for Construction Machine
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Solution Overview
Problem
Access ladders on large machines are prone to damage due to operational environments and can be compromised when the machine's implement is lifted without stowing the ladder, necessitating a more efficient and safer deployment and stowage system.
Innovation Solution
A control system that includes a powered hinge mechanism for the ladder, a control unit to monitor and alert the operator of the ladder's position, and limit implement operation to prevent damage, allowing for single-motion deployment and stowage between a deployed and stowed position, with override options for the operator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the ladder is left in the deployed position during machine operation, then operator access to the cab is maintained, but the ladder is vulnerable to damage from rock, trees, and other work materials
Solution Approach 1:
The ladder system transitions from a static fixed position to a dynamic reconfigurable state. The ladder can be automatically deployed to a vertical position for operator access and retracted to a stowed position parallel to the machine body during operation, adapting to different operational requirements and preventing damage while maintaining accessibility.
2Reliability
If the ladder is stowed during implement operation, then the ladder is protected from damage, but the operator cannot access the cab when needed
Solution Approach 1:
The control system continuously monitors the implement position and automatically deploys the ladder when the implement is in the lowered position, ensuring operator access is available when needed. The system provides real-time feedback between implement state and ladder position, automatically managing the ladder to maintain accessibility while preventing damage.
3Ease of operation
If a powered hinge mechanism with automated control is implemented, then ladder deployment and stowage are simplified and protected from damage, but the device complexity increases
Solution Approach 1:
The control system integrates multiple functions into a single automated unit that monitors implement position, controls ladder deployment, and manages stowage operations. The powered hinge mechanism combines structural support with actuation capabilities, merging mechanical and control system functions to simplify operation while managing complexity through integration.
Data Source
AI summary
A machine includes a machine body that includes an operator platform. The machine also includes an implement, a ladder moveable between a deployed position and a stowed position, and control unit configured to limit operation of the implement when the ladder is in the deployed position.