Full
Outline
In response to the problems of large mining range, ore dilution rate, low mechanization degree, and high safety risks in the shallow hole shrinkage mining method for sharply inclined thin ore veins in China, taking the occurrence conditions of a certain metal mine as the engineering application background, a mechanized mining process of shallow hole shrinkage mining method was proposed, and the mechanized mining idea of using micro rock drilling rigs to drill shallow holes upwards was determined. Firstly, based on the operating conditions of the experimental mining site, the design principles and main technical parameters of the micro rock drilling rig were determined. Secondly, the whole machine adopted the design scheme of modularization and 4-degree-of-freedom rock drilling positioning, and the passability, rock drilling positioning, machine stability, and in-situ steering drive system of the micro rock drilling rig were calculated and simulated in narrow and complex environments. The results show that the micro rock drilling rig can meet the practical engineering applications of narrow space transition driving, rock drilling positioning, and visual distance remote control operation in the mining of sharply inclined thin ore veins with shallow hole shrinkage method. The fastest single hole drilling speed can reach 2.2 m/min, the average of efficiency of artificialrock drilling is 1.35 m/min, and the drilling efficiency of equipment is 1.69 m/min, and the comprehensive rock drilling efficiency has been improved by more than 25% compared to manual rock drilling efficiency. At the same time, visual distance remote control can effectively reduce the number of operators, reduce mining amplitude, reduce safety risks, and improve comprehensive mining efficiency, which can provide equipment scheme reference for mechanized fransformation of steeply inclined thin veins with mining dip angle greater than 65° and pulse thickness less than 0.8 m.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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