Forestry Vehicle Boom Compensation for Stable Stem Feeding
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Solution Overview
Problem
The manual control of boom arrangements in forestry vehicles leads to increased wear and power consumption of hydraulic actuators, operator fatigue, and inefficient processing due to uneven movement of tree stems during cutting and delimbing operations.
Innovation Solution
A system with sensors and a CPU unit that automatically compensates the movement of the boom arrangement and boom tip during the feeding process, aligning it with the stem's longitudinal axis to reduce knife pressure and stabilize the closing force, thereby reducing wear and fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the boom is held in static position during feeding operation, then the harvester head can process the stem, but the stem increases pressure on the knives leading to opening movement and increased hydraulic pressure
Solution Approach 1:
The boom arrangement transitions from a static position to a dynamic moving position during the feeding operation. The CPU-controlled system automatically adjusts the boom's longitudinal position to match the feeding speed of the stem, converting the static support structure into a dynamically adaptive one that reduces hydraulic pressure requirements while maintaining processing stability.
2Ease of operation
If the operator manually moves the boom during feeding operation, then the stem movement can be controlled, but the operator experiences fatigue and performance loss
Solution Approach 1:
The boom arrangement system performs the adjustment function autonomously without requiring continuous manual intervention. The CPU receives feeding speed data from sensors and automatically controls the hydraulic actuators to move the boom at the appropriate speed, making the system self-regulating and eliminating operator fatigue while maintaining productivity.
Solution Approach 2:
The system uses sensors to detect the feeding speed of the stem and provides feedback to the CPU, which then adjusts the boom movement speed accordingly. This closed-loop feedback mechanism ensures the boom moves in synchronization with the feeding process, maintaining optimal operating conditions without manual intervention.
3Productivity
If the stem moves through the harvester head while pulled over the ground, then the feeding process can proceed, but the contact area between knives and stem increases pressure leading to knife opening movement
Solution Approach 1:
The boom arrangement moves in advance to compensate for the stem's feeding movement before the knives need to exert excessive closing force. By proactively adjusting the boom's longitudinal position to match the feeding speed, the system prevents the stem from pulling away and reduces the required knife closing force throughout the processing operation.
Data Source
Figure 1~2
AI summary
The invention describes a system for a forestry vehicle, the system adapted to realize a movement of a boom arrangement during a feed process of the forestry vehicle, the vehicle adapted to have a boom arrangement, the boom arrangement having a slewing device, a boom tip and an extension boom, the boom tip having a rotator, adapted to rotate a connected working device around a vertical axis, the working device adapted to be a harvester head, the system controlling the boom arrangement so that the movement of the stem through the harvester head during feeding over the ground is at least partly compensated by movement of the boom tip, wherein the movement is in a direction of a longitudinal axis of the stem.