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21
2022-11
Chapter I Laws, Regulations and Safety Management System
2022-11-21
03
2021-06
1. Product Background Using regular drilling technology to drill holes in high-gas soft outburst coal seams is easy to cause accidents such as hole collapse and holding, which not only increases the difficulty of drilling construction, but also causes blockage of drainage holes due to unstable collapse of the hole wall after drilling construction is completed, which affects the drainage effect. How to improve the gas drainage concentration and drainage volume of soft outburst has always been a major problem in coal mine gas control. The construction technology of lowering the screen pipe from the inner hole of the drill pipe after drilling can solve the problem of blockage of the drainage hole caused by the collapse of the drilling hole, thus improving the drainage effect. 2. matching of products: gas (methane) is the initial stage of accumulation of ancient plants into coal, cellulose and
2021-06-03
09
2020-09
22
2020-07
Knowledge Popularization on Upper Corner of Return Air in Fully Mechanized Coal Mining Face
What is the upper corner of return air in coal mining face? The corner (yu, second tone) means the corner, and the corner refers to the corner position. The upper corner is generally a mining noun, which refers to the return air side of the coal mining face and the triangular zone near the upper side of the return air lane and the edge of the goaf. The ventilation in this area is not good, the temperature and humidity are high, and it is easy to accumulate the gas released by the intersection of goaf and mining face, and the gas concentration is high. It is the focus of gas prevention and control in working face.
2020-07-22
09
2020-04
09
2020-04
MT/T 516.2-1995 drill bit for hydraulic rock drill in coal mine
MT/T 516.2-1995 drill bit for hydraulic rock drill in coal mine
2020-04-09
09
2020-04
Key Technology of Directional Drilling Along Each Layer at 3000m in Coal Mine
Key Technology of Directional Drilling Along Each Layer at 3000m in Coal Mine
2020-04-09
12
2020-03
Benefiting Mining Technology-Reverse Circulation Dust Fixed-point Sampling Device
The reverse circulation dust fixed-point sampling device adopts advanced multi-stage ejection technology in accordance with the sampling requirements specified in GB/T23250 "Direct Determination Method of Coal Seam Gas Content Downhole" and "Detailed Rules for Prevention and Control of Coal and Gas Outburst" to realize fixed-point sampling while drilling without withdrawing drill pipe, and can realize fast fixed-point sampling at any point within 100m or more of the coal seam within 20 minutes. It is a complete set of equipment with advanced concept and high sampling success rate in China. Our company has applied for patent technology, this process is mainly used for dust monitoring in the process of sampling measurement, coal powder gas content and fixed-point dust sampling of the early drilling and late reverse.
2020-03-12
