Tree Stem Processing Tool Control for Chain Shot Risk
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Solution Overview
Problem
Mobile work machines, particularly forestry equipment, face hazards due to breaking saw chains during power-driven operations, where chain shot can cause damage by flying off and hitting the machine or nearby objects, and existing solutions do not adequately mitigate these risks.
Innovation Solution
A control unit is implemented that uses sensors to determine the orientation and trajectory of potential hazards from a tree stem processing tool, adjusting operating parameters such as torque, force, rotational speed, and speed of the sawing apparatus based on the distance to nearby objects or locations to prevent damage by reducing power-driven operation intensity when hazards are closer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sawing apparatus operates at high power-driven intensity, then productivity increases, but the risk of chain shot causing damage increases
Solution Approach 1:
The system dynamically adjusts the operating parameters of the sawing apparatus based on real-time sensor data about the tool's orientation and position. The control unit continuously monitors hazard conditions and modifies power-driven operation intensity accordingly, transitioning between different operational states to balance productivity and safety
Solution Approach 2:
The control unit changes operating parameters such as torque, force, rotational speed, and speed of the sawing apparatus based on prevailing separation or distance determined from sensor information. When hazard risk increases, parameters are reduced; when risk decreases, parameters can be increased to maintain productivity
2Reliability
If the control system continuously monitors and adjusts operating parameters, then safety improves, but device complexity increases
Solution Approach 1:
The system uses sensors to continuously monitor the orientation and position of the tool, feeding this information back to the control unit. The control unit processes this feedback and automatically adjusts operating parameters to maintain safe operation, creating a closed-loop control system that improves safety through continuous monitoring and adjustment
Solution Approach 2:
The control system automatically determines prevailing separation or distance and adjusts operating parameters without requiring manual intervention. The system serves itself by autonomously monitoring hazard conditions and modifying its own operation, reducing the need for complex external control mechanisms
Data Source
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AI summary
A control unit for controlling a tree stem processing tool (30) pivotably mounted to an articulated boom (20) in such a way that orientation of the tool is changed when the tool is controllably rotated about a rotation axis (N) that is oriented substantially vertically, the articulated boom being rotatably connected to a mobile work machine (10), wherein the control unit (50) is adapted to automatically apply a control mode in the control unit in which control mode the power-driven operation is controlled according to a predetermined dependency in such a way that one or more operating parameters influencing the power-driven operation vary as a function of the prevailing separation or the prevailing distance.