Rock Bolt Blind Nut Visual Indicator for Correct Torsion
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Solution Overview
Problem
The existing technologies for installing rock bolts often result in incorrect installation due to the lack of a reliable method to ensure that the blind nut is properly rotated, leading to potential instability and risk of formation collapse.
Innovation Solution
A rotation indication device is introduced, which includes a blind nut with a threaded central recess and a visual indication means that moves into view when the blind nut is properly rotated, allowing for easy visual inspection to confirm correct installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual inspection and tightening of rock bolts is performed, then installation quality can be checked, but the process is time-consuming and error-prone
Solution Approach 1:
The rotation indication device enables the rock bolt system to self-indicate its installation status. The visual indicator automatically changes state based on the rotation of the blind nut, eliminating the need for external inspection and providing immediate, error-free feedback on installation quality.
Solution Approach 2:
The device provides immediate visual feedback about the installation status of the rock bolt. The indicator element communicates the rotation status of the blind nut directly to the operator, allowing real-time verification of correct installation without time-consuming manual inspection.
2Strength
If the blind nut is rotated to increase attachment strength, then the bolt engagement strength is improved, but incorrect installation may occur if the nut is not rotated
Solution Approach 1:
The visual indication device provides immediate feedback to the operator about whether the blind nut has been rotated sufficiently. The indicator element changes state to confirm correct rotation, ensuring that the attachment strength requirement is met and preventing incorrect installation.
Solution Approach 2:
The indicator element acts as an intermediary between the blind nut rotation mechanism and the operator. It translates the mechanical rotation of the blind nut into a visible signal, making the installation status immediately apparent and ensuring correct installation procedures are followed.
3Reliability
If a complex tension indication device is used, then installation status can be monitored, but the device complexity increases
Solution Approach 1:
The patent extracts only the essential function of tension indication from complex existing devices. By using a simple indicator element that responds to blind nut rotation, it provides reliable installation status monitoring without the unnecessary complexity of previous tension indication devices.
Solution Approach 2:
The indicator element is designed as a simple, inexpensive component that provides its indication function and can be easily replaced. This approach achieves reliable monitoring with minimal complexity, using a straightforward mechanical indicator rather than complex electronic or mechanical systems.
Data Source
AI summary
A rotation indication device for a rock bolt including a central rod with a threaded trailing portion. The rotation indication device includes a blind nut having a threaded central recess for engaging the threaded trailing portion and a visual indication means provided at a bottom portion of the central recess and configured such that upon movement of the threaded trailing portion of the central rod into the bottom portion of the central recess, the central rod forces at least a portion of the visual indication means to move through a passage in the blind nut between the bottom portion of the central recess and the outside of the blind nut.