Overhead Line Tension Control for Timber Conveyance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing overhead line systems for timber conveyance are prone to breakdowns due to increased tension when abnormalities occur, such as timber getting caught on trees, which can lead to system failure and damage.
Innovation Solution
An overhead line system with a control device that manages tension by lowering work ropes and main ropes when abnormal tension is detected, using a network of support posts, lifting devices, and a suspension device to move the logging device and suspension system to the ground, reducing the risk of system failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the winch is continuously operated to convey timber, then productivity is improved, but the system reliability deteriorates when tension abnormalities occur
Solution Approach 1:
The control device continuously monitors tension in the wire and automatically responds when abnormal tension is detected. This closed-loop feedback system allows the winch to operate continuously for high productivity while automatically protecting the system when abnormalities occur, resolving the contradiction between productivity and reliability
Solution Approach 2:
The control device is configured to detect tension abnormalities before they cause system breakdown. By monitoring tension levels and stopping the winch operation in advance when abnormal tension is detected, the system prevents catastrophic failures while maintaining continuous operation capability under normal conditions
2Reliability
If the winch stops operation when tension abnormality is detected, then system protection is improved, but productivity deteriorates due to operational interruptions
Solution Approach 1:
The automatic feedback control system enables the winch to operate continuously under normal conditions, maintaining high productivity. When tension abnormalities are detected, the system automatically stops operation to protect the system, then can resume operation after the abnormality is resolved, achieving both system protection and productivity maintenance through intelligent automated control
3Reliability
If tension monitoring and automatic control are added, then system reliability is improved, but device complexity increases
Solution Approach 1:
The control device monitors tension in the wire and automatically controls the lifting device based on detected tension levels. This automated feedback mechanism improves reliability by continuously monitoring system state and responding to abnormalities, while the integration into the existing control system minimizes the increase in overall device complexity
Solution Approach 2:
The control device automatically detects tension abnormalities and controls the lifting device without requiring external intervention. This self-service capability improves reliability through continuous automated monitoring while avoiding the complexity of manual intervention systems
Data Source
AI summary
An overhead line system includes a plurality of support posts, an overhead line supported by the support posts, a lifting device with which the overhead line is liftable, a suspension device that is connected to the overhead line and is movable in the air as the lifting device winds the overhead line, and a control device. The control device controls the lifting device so as to reduce tension when a predetermined condition relating to a tension abnormality of the overhead line is satisfied.