Log Grapple Accumulation Arm Synchronized Control
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Solution Overview
Problem
Existing log grapple equipment lacks efficient mechanisms for securely grasping and manipulating logs, particularly in handling multiple logs simultaneously and maintaining control during operation.
Innovation Solution
The log grapple machine incorporates a boom, a cross head, a grapple box, primary grapple tongs, and accumulation arms, which are controllable by actuators and sensors, allowing for synchronized movement and secure grasping of logs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single grapple tong is used to hold logs, then the structure is simple, but the ability to securely grasp and manipulate multiple logs simultaneously is insufficient
Solution Approach 1:
The grapple system is divided into multiple independent tongs (primary and secondary) that can operate semi-independently. Each tong can grasp logs separately, allowing the system to handle multiple logs simultaneously while maintaining relatively simple individual tong structures
Solution Approach 2:
The secondary grapple tong is nested within the structure defined by the primary grapple tong. The secondary tong operates within the space created by the primary tong, allowing both tongs to function together without requiring completely separate structural systems
2Force
If the grapple tong is designed for strong grasping force, then log holding security is improved, but the control precision during manipulation decreases
Solution Approach 1:
The grasping function is segmented between primary and secondary tongs, allowing different portions of the log bundle to be secured by different tongs. This segmentation enables more precise control over individual logs while maintaining overall grasping strength
Solution Approach 2:
The grapple system uses dynamic control where the primary and secondary tongs can move and adjust their positions independently to some extent, allowing operators to precisely position and manipulate logs while maintaining secure grasping force
3Adaptability or versatility
If the accumulation arm operates independently, then flexibility in log positioning is improved, but synchronization with grapple tong movement becomes difficult
Solution Approach 1:
The control system uses feedback mechanisms where sensors detect the positions and movements of both the grapple tongs and accumulation arm, automatically adjusting their coordination to maintain synchronization while allowing independent operation for flexible positioning
Solution Approach 2:
The accumulation arm is designed with multi-functionality, serving both as a support structure for the grapple tongs and as an independent positioning mechanism. This universal design allows it to perform multiple functions without requiring completely separate control systems
Data Source
AI summary
A log grapple machine comprises a frame supporting a boom. The boom is controllable by a boom actuator. The log grapple machine further comprises a support member having a first end coupled to the boom and a second end coupled to a grapple box. The support member supports the grapple box. The log grapple machine further comprises a primary grapple tong coupled to the grapple box and movable between an open position and a closed position. The log grapple machine further comprises an accumulation arm coupled to the grapple box and movable between an open position and a closed position.