Tree Processing Head Saw Control Using Cut-Completion Feedback
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Solution Overview
Problem
Operators of tree processing systems face challenges in efficiently cutting trees due to blind spots created by bar saw and grapple saw heads, which require longer operation times and uncertainty about the saw bar's position during tree separation.
Innovation Solution
A tree processing system equipped with a controller, motor, saw, arm, and sensor that detects changes in hydraulic pressure or speed to determine when the saw bar has reached specific positions, allowing for automated control of the cutting operation and reducing unnecessary cutting cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the saw bar is commanded to travel through the entire tree to ensure complete cutting, then the reliability of tree separation is improved, but the cutting time is increased due to blind spots obstructing operator vision
Solution Approach 1:
The system uses sensors (optical, acoustic, or force sensors) to detect the saw bar's position and the tree's separation status in real-time, providing feedback to the controller. This allows the controller to adjust the saw bar's movement dynamically, stopping when cutting is complete rather than requiring the operator to wait for the saw bar to traverse the entire tree blindly.
Solution Approach 2:
The patent replaces the manual visual monitoring system with an automated sensor-based detection system. Instead of relying on operator vision through blind spots, the system uses sensors to detect cutting completion, substituting mechanical/optical detection with electronic sensing and control.
2Manufacturing precision
If the operator waits until the saw bar is visible on the opposite side to ensure complete cutting, then the manufacturing precision of the cut is improved, but the productivity is reduced due to extended waiting time
Solution Approach 1:
Sensors provide real-time feedback on the saw bar's position and the tree's separation status, allowing the controller to determine cut completion accurately without requiring the operator to wait for visual confirmation. This maintains cutting precision while eliminating unnecessary waiting time.
Solution Approach 2:
The system creates an informational copy of the cutting state through sensor detection, allowing the operator to know the cutting status without direct visual observation. This copy of information (sensor data) replaces the need for direct visual verification, maintaining precision while improving productivity.
3Reliability
If the saw bar is commanded to travel for more time than desired to ensure complete cutting, then the reliability of tree separation is improved, but the energy consumption is increased during dry run periods
Solution Approach 1:
The sensor system provides feedback to the controller to detect when the tree separation is complete. The controller then stops commanding the saw bar to move, eliminating unnecessary dry run periods and reducing energy consumption while maintaining reliable tree separation.
Solution Approach 2:
The system uses sensors to automatically detect cutting completion and signal the controller to stop the saw bar movement. This self-service detection mechanism eliminates the need for extended commanded travel time, reducing energy waste during dry runs while ensuring complete separation.
Data Source
AI summary
A tree processing system may include a tree processing head and a controller. The tree processing head may include a header frame, a motor, a saw, an arm, and a sensor. The saw is used to cut a tree when the saw is driven by the motor. The saw engages with the tree from a first position and to a second position. The first position and the second position define a cutting zone therebetween. The sensor is used to detect a saw operation speed or current. The controller is coupled to the sensor and configured to determine whether the second position is reached based upon an increase of the saw operation speed or current detected by the sensor. When the second position is reached, the controller transmits a resting signal to the tree processing head to perform a resting operation.