Needle Guide Structure for Low-Friction Wood Resistance Drilling
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Solution Overview
Problem
Existing drilling resistance measurement units face significant friction issues due to the large contact surface of telescoping sleeves, which affect the accuracy of feed measurements during wood inspection.
Innovation Solution
A needle-guiding device featuring a scissor-type extension arm device with crossing stays or a drive device with parallel force transmitting elements, such as chains or toothed belts, reduces friction by minimizing contact surfaces and optimizing joint structures for low friction transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If telescoping sleeves are used to guide the drilling needle, then the drilling needle can be supported and guided during the drilling process, but large friction is generated due to the great contact surface, which affects feed measurement accuracy
Solution Approach 1:
The telescoping sleeve is divided into multiple individual cup elements that can move independently relative to each other. This segmentation reduces the contact surface between guiding elements and the drilling needle, thereby reducing friction while maintaining guiding stability. Each cup element has its own guide means, creating multiple discrete contact points rather than a continuous large contact surface.
2Strength
If telescoping sleeves with large contact surface are used, then the drilling needle is well supported, but friction forces are generated that must be overcome and affect feed measurement
Solution Approach 1:
The support function is distributed across multiple segmented cup elements rather than a single continuous sleeve. Each segment provides localized support through its own guide means, maintaining overall support capability while reducing the total contact surface area and associated friction energy losses.
Solution Approach 2:
Each cup element is equipped with its own guide means positioned at specific locations, creating localized guiding and support zones. This allows the system to maintain support capability where needed while minimizing contact surface in other areas, thereby reducing friction energy without compromising overall support.
3Manufacturing precision
If multiple telescoping cup sections are used to guide the drilling needle, then the needle can be centrally guided throughout the drilling process, but the friction from sequential movement of cups affects the feed measurement
Solution Approach 1:
The guiding function is distributed across multiple segmented cup elements, each with its own guide means. This segmentation maintains central-axial guiding precision through multiple discrete guidance points while reducing the continuous contact surface that causes friction, thereby improving feed measurement accuracy.
Data Source
AI summary
The present invention relates to a needle-guiding device (2) for a specified drilling resistance measurement unit, a drilling resistance measurement unit itself for investigating the nature of wood, and to a method for investigating the nature of wood. The needle-guiding device (2) for the drilling resistance measurement unit is designed to guide the drill needle (1) and to be operatively coupled to a drive of the drilling resistance measurement unit. The needle-guiding device (2) has a supporting device and a needle holder (4). The needle holder (4) has a drill chuck which is designed to receive the specified drill needle (1), and the supporting device extends in the longitudinal direction of the specified drill needle (1). According to the invention, the supporting device comprises at least one scissor-type extending grid device (8) having a scissor-type extending grid (8′) consisting of bars (81) or has a drive device having two interacting force transmission elements which are arranged parallel next to each other.