Bolter Miner Integrated Bolt Support for Tunnel Roof Stability
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Solution Overview
Problem
Tunneling systems in coal mines face risks of caving and significant bending and sinking at the heading face, compromising safety and efficiency due to inadequate support mechanisms during tunnel excavation.
Innovation Solution
A tunneling system comprising a bolter miner with a cutting device and bolt support device, including a lifting assembly, work platform, and stabilizing assembly, which allows for adjustable positions to perform simultaneous tunneling and bolt support operations, enhancing stability and flexibility according to varying tunnel roof conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional tunneling methods are used without integrated bolt support, then the tunneling process is simpler, but the risk of caving and bending at the heading face increases significantly
Solution Approach 1:
The patent combines the heading machine and bolt support device into an integrated bolter miner system. The bolt support device includes a drilling frame assembly that can be positioned above the cutting device, allowing simultaneous or sequential tunneling and bolt support operations. This merging eliminates the need for separate support operations, reducing unsupported roof distances and preventing caving while maintaining a unified system structure.
Solution Approach 2:
The bolter miner is designed with multi-functional capabilities: the cutting device performs tunneling, the lifting assembly adjusts the work platform height, the drilling frame assembly performs bolt support, and the stabilizing assembly ensures operational stability. This universal design allows a single machine to perform multiple functions that traditionally required separate equipment, improving safety without proportionally increasing system complexity.
2Productivity
If the heading face is advanced quickly, then productivity increases, but the amplitude of bending and sinking at the heading face increases, compromising safety
Solution Approach 1:
The bolt support device is positioned to operate in advance or simultaneously with the cutting device. The drilling frame assembly can be located above the heading face to install support bolts before the roof advances further, creating preliminary support that prevents bending and sinking even during rapid tunneling advancement. This preliminary action ensures stability is maintained throughout the advancement process.
Solution Approach 2:
The integrated design allows continuous operation where the cutting device and bolt support device work in coordinated sequence without interruption. The lifting assembly enables smooth positioning of the drilling frame, and the stabilizing assembly maintains continuous contact with the roof, ensuring uninterrupted support action that matches the continuous tunneling process, thereby maintaining stability at high productivity levels.
3Adaptability or versatility
If a fixed bolt support position is used, then the device structure is simpler, but the system cannot adapt to varying tunnel roof conditions
Solution Approach 1:
The bolt support device incorporates a lifting assembly with movable components that enable dynamic adjustment of the work platform and drilling frame assembly height. This dynamic positioning system allows the drill to reach various roof heights and angles, adapting to varying tunnel roof conditions. The stabilizing assembly also provides dynamic stabilization during positioning, ensuring operational stability throughout the adjustment range.
Data Source
AI summary
A tunneling system includes a bolter miner, a bolter-integrated transportation machine, a transfer machine, a self-moving tail and a belt conveyor. The bolter miner includes a rack, a cutting device, and a bolt support device. The bolt support device includes a lifting assembly, a work platform, a first drilling frame assembly and a stabilizing assembly. The lifting assembly is arranged between the rack and the work platform. The first drilling frame assembly and the stabilizing assembly are arranged on the work platform. The bolter-integrated transportation machine is arranged behind the bolter miner and configured to transfer coal rock cut and conveyed by the bolter miner. One end of the transfer machine is connected with the bolter-integrated transportation machine, and the other end of the transfer machine is lapped with the self-moving tail. The belt conveyor is arranged behind the self-moving tail.