Harvester Measuring Wheel Trunk Support and Length Accuracy
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Solution Overview
Problem
Existing harvester heads face inaccuracies in measuring tree trunk length due to issues like the feed wheel gliding or slipping, which affects the reliability of length measurement during processing.
Innovation Solution
A measuring wheel apparatus connected to the harvester head's frame in a swinging manner, equipped with a power device to keep the measuring wheel pressed against the trunk and functioning as a supporting roller to prevent sliding, while also integrating debarking capabilities, thus reducing the need for a separate supporting roller and enhancing structural compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a feed wheel is used to measure trunk length, then the measurement can be obtained from rotation monitoring, but the feed wheel may glide or slip resulting in measurement inaccuracies
Solution Approach 1:
The patent combines the measuring wheel and supporting roller into a single integrated component. The measuring wheel is configured to both support the trunk and provide accurate length measurement, eliminating the need for a separate feed wheel that causes slipping and measurement errors.
Solution Approach 2:
The measuring wheel serves multiple functions simultaneously: it acts as a supporting roller to hold the trunk, a measuring device to track length through rotation monitoring, and a stabilizing element to prevent trunk movement during processing.
2Measurement precision
If a separate supporting roller is added to prevent trunk sliding, then measurement accuracy improves, but the device complexity increases
Solution Approach 1:
The patent merges the supporting roller function into the measuring wheel itself. The measuring wheel is positioned and configured to simultaneously support the trunk and enable accurate measurement, eliminating the need for additional separate supporting rollers and reducing structural complexity.
Solution Approach 2:
The measuring wheel is designed as a multi-functional component that provides both mechanical support for the trunk and precise length measurement capabilities, replacing what would otherwise require multiple separate components.
3Measurement precision
If the measuring wheel is firmly pressed against the trunk, then measurement accuracy improves, but the feeding force required increases
Solution Approach 1:
The patent applies localized pressing force only at the measuring wheel contact point with the trunk, rather than applying force along the entire feeding path. This concentrated local contact ensures measurement accuracy while minimizing the overall feeding force required.
Solution Approach 2:
The measuring wheel acts as an intermediary element that provides just enough contact force to ensure accurate measurement without transmitting excessive force through the feeding system. Its positioning and mechanical properties mediate between the need for stable contact and the need to minimize feeding resistance.
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
The solution ensures accurate trunk length measurement by maintaining contact with the trunk and providing a supporting force, reducing the feeding force required and allowing for efficient debarking, resulting in a robust and compact harvester head design.
Implementation Method 1
a measuring wheel configured to roll along a tree trunk when the trunk is fed through the harvester head
Implementation Method 2
a power device configured to swivel the measuring wheel apparatus and to keep the measuring wheel pressed against the trunk
Implementation Method 3
The measuring wheel acts as a device for performing or assisting in debarking... the measuring wheel also acts as a supporting roller
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A harvester head, comprising a measuring wheel apparatus (24) with a measuring wheel (35) configured to roll along a tree trunk when the trunk is fed through the harvester head (1 1 ), and a power device (34) configured to swivel the measuring wheel apparatus (24) and to keep the measuring wheel (35) pressed against the tree trunk. The measuring wheel (35) is configured to remain in an elevated position in relation to the frame structure (12) of the harvester head, wherein the measuring wheel (35) also has a supporting position to support the trunk and to prevent the placement of the trunk against the frame structure (12). A measuring wheel apparatus which is applicable in a harvester head, comprising a measuring wheel (35) with a supporting position to support a tree trunk, and which comprises a stopping member configured to stop the swinging motion of the measuring wheel apparatus (24) when the measuring wheel (35) assumes said supporting position.