Timber-Working Head with Independent Pivot Arms
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Solution Overview
Problem
Existing timber-working heads face issues with ill-formed tree stems causing uneven contact between feed wheels, leading to hydraulic oil bypass, slipping, and potential damage due to a fixed mechanical link between arms, which affects traction and increases complexity and cost, as well as points of mechanical failure.
Innovation Solution
The implementation of mechanically independent pivot arms with linear drive actuators controlled by a processor to adjust pressure, allowing each arm to move independently and maintain optimal contact with the stem, reducing offset and ensuring consistent traction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed mechanical link is used between the arms to ensure they open and close together, then the arms maintain synchronized movement, but this causes uneven contact with ill-formed stems leading to hydraulic oil bypass, wheel slipping, and potential damage
Solution Approach 1:
The patent divides the previously linked arm system into two independent arms, each with its own hydraulic control. This segmentation allows each arm to independently adapt to the stem's irregular shape without being constrained by a fixed mechanical link, eliminating the hydraulic oil bypass and slipping problems while maintaining synchronization through coordinated control.
Solution Approach 2:
The patent transitions from a static fixed mechanical link to a dynamic system where each arm's position and force can be independently adjusted in real-time. The hydraulic actuators can dynamically modify arm movement to accommodate varying stem contours, ensuring consistent contact and preventing slipping while maintaining overall synchronization.
2Stability of the object's composition
If a fixed mechanical link between arms is used, then structural stability is maintained, but this adds weight and complexity to the harvester frame and pins
Solution Approach 1:
The patent removes the complex fixed mechanical link (including the timing link, pins, and associated frame structures) from the arm system. By extracting this unnecessary component, the design achieves structural stability through the inherent rigidity of the simplified arm-mounting structure while significantly reducing overall system complexity and weight.
Solution Approach 2:
The patent replaces the complex mechanical linkage system with a simplified direct-mounting structure combined with hydraulic control. This substitution eliminates the need for intricate mechanical connections between arms, reducing frame and pin complexity while maintaining stability through the hydraulic actuation system and simplified structural design.
3Device complexity
If a fixed mechanical link is used to connect the arms, then the system structure is simplified, but this creates potential points of mechanical failure particularly where ill-formed stems lead to imbalance of forces
Solution Approach 1:
The patent segments the force transmission paths by giving each arm independent hydraulic control, separating the force application mechanisms. This allows each arm to independently handle unbalanced forces caused by irregular stem shapes without transmitting stress through a mechanical link, eliminating failure points while maintaining a simple overall structure.
Solution Approach 2:
The patent replaces the mechanical force transmission link with independent hydraulic force application systems for each arm. This substitution eliminates the mechanical failure points in the linkage while keeping the system structure simple, as the hydraulic system naturally accommodates unbalanced forces without requiring complex mechanical compensation mechanisms.
4Adaptability or versatility
If mechanically independent pivot arms are used with linear drive actuators, then each arm can maintain optimal contact with irregular stems, but this requires processor control to coordinate arm movement and pressure application
Solution Approach 1:
The patent implements feedback control where processors monitor the position and force of each independent arm, using this information to dynamically adjust hydraulic pressure and arm movement. This feedback mechanism enables optimal contact with irregular stems while automating the coordination between arms, making the increased adaptability manageable without excessive complexity.
Solution Approach 2:
The patent enables the arm system to self-adjust to irregular stem shapes through processor-controlled hydraulic actuators that automatically modify arm position and force based on real-time conditions. This self-service capability allows the system to adapt to various stem configurations without manual intervention, balancing adaptability with automated coordination.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the timber-working head's ability to handle irregularly shaped stems by maintaining consistent contact and reducing the risk of damage, improving feed performance and reducing mechanical stress, thereby increasing productivity and reducing maintenance needs.
Implementation Method 1
A first linear drive actuator may be connected to the first arm, and a second linear drive actuator may be connected to the second arm. The linear actuators may be configured to pivot the respective arms relative to the frame to open and close them.
Data Source
AI summary
A timber-working head and method of operation are provided. The head has a frame to which first and second arms are pivotally connected. Respective linear drive actuators pivot the respective arms relative to the frame to open and close them. At least one processor controls application of pressure by the linear drive actuators such that the arms grasp timber to be processed by the head. The position of the linear actuators is used to determine whether the timber is offset from a feed axis of the frame beyond a predetermined distance, and the application of pressure by one of the linear actuators to reduce the offset to be within the predetermined distance.