Variable diameter back reaming device
CN310188422SActive Publication Date: 2026-09-04CHINA RAILWAY 12TH BUREAU GRP HAINAN ENG CO LTD +2
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Patent Information
- Application Number
- CN202630153410.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Designs(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-03
- Publication Date
- 2026-09-04
- Estimated Expiration
- 2041-04-03
Smart Images
Figure 000001_ABST
Abstract
1. The name of the design product: variable diameter reverse reaming device. 2. The use of the design product: the design product is used for variable diameter reverse drilling at any position in the construction process of long distance advanced drainage hole in tunnel, solving the problem of misalignment of reaming hole bottom and round hole bottom after replacing drill bit. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: front view.
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