Log Grapple With Independent Drive Wheels For Damage-Free Handling
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Solution Overview
Problem
Existing log handling systems face inefficiencies in moving, sorting, and loading logs of varying diameters, as they often damage logs and require multiple machines for different tasks, limiting their versatility and operational range.
Innovation Solution
A log grapple system with pivotally coupled arms and independently movable drive wheels, allowing for multiple operational modes (start, grapple, and feed modes) to grasp, sort, and move logs without damaging them, and incorporating a measuring wheel assembly with actuators for precise log handling and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional hydraulic grapple systems are used to grasp and move logs, then logs can be moved toward desired positions, but logs of varying diameters are damaged and multiple machines are required for different tasks
Solution Approach 1:
The grapple system employs dynamically adjustable arms that can independently change their position and orientation to adapt to logs of varying diameters. The arms are equipped with adjustable grippers that can modify their closing force and positioning, allowing the system to handle different log sizes without causing damage while maintaining versatility across various log types.
2Productivity
If multiple machines are used for different log handling tasks (skidders, yarders, excavators), then specific tasks can be performed, but operational efficiency decreases and more equipment is required
Solution Approach 1:
The log grapple system is designed as a multi-functional platform that can perform delimbing, measuring, sawing, and loading operations using a single integrated machine. The system includes interchangeable tools and attachments that can be mounted on the same base platform, eliminating the need for multiple specialized machines (skidders, yarders, excavators) and significantly improving operational efficiency through consolidation.
3Measurement precision
If hydraulic grapple systems are used for log handling, then logs can be grasped and moved, but the systems lack precision in positioning and sorting
Solution Approach 1:
The log grapple system incorporates sensors and measurement devices that provide real-time feedback on log position, orientation, and dimensions. This feedback is processed by a control system that automatically adjusts the arm positions and gripper forces to achieve precise positioning and sorting. The feedback mechanism enables accurate log handling while maintaining ease of operation through automated control.
4Length of moving object
If traditional log handling methods are used, then logs can be moved to landing areas, but the process requires multiple repositioning operations when distance exceeds boom reach
Solution Approach 1:
The log grapple system uses a segmented, multi-jointed arm structure that allows for extended operational reach. The arms can be divided into multiple segments that can independently position and reposition, enabling the system to reach logs at greater distances without requiring the entire machine to be repositioned. This segmentation significantly reduces the time lost to repositioning operations while maintaining the ability to handle logs over longer distances.
Data Source
AI summary
Embodiments described herein provide methods, apparatuses, and systems for moving, loading, and/or sorting logs. A log grapple may include opposing arm assemblies and independently positionable drive wheels disposed between the arms. The log grapple may be operable in a grapple mode, in which the arms are in a closed position and the drive wheels are in an open position, and a feed mode, in which the arms and the drive wheels are in closed positions. In feed mode, the first and second drive wheels may be rotated to drive the log through the arms. The log grapple may be further configured to delimb, measure, and/or cut logs in the feed mode. A log grapple may also include a measuring wheel assembly. Optionally, the measuring wheel assembly may include a hydraulic actuator configured to retract the measuring wheel and a gas spring configured to extend the measuring wheel.