The Coal Mine Deep Hole Fixed-Point Rapid Sampling Device addresses the requirement for achieving fixed-point rapid sampling during the process of drilling and sampling in coal seams. This instrument utilizes jet technology and multi-stage induction technology, allowing sampling without withdrawing the drill pipe, enabling rapid fixed-point sampling at any point within 100 meters or a larger range in the coal seam within 5 minutes. It complies with the GB/T23250 "Direct Determination Method of Coal Seam Gas Content Underground" requirement that "sampling time is less than 5 minutes and fixed-point sampling is achieved."
Product Use
The Coal Mine Deep Hole Fixed-Point Rapid Sampling Device enables rapid sampling and fixed-point sampling during the coal seam drilling process.
Technical Parameters
Drill pipe diameter: 73mm;
Drill bit diameter: 94mm;
Sampling speed: >500 g/min;
Rated working air pressure: above 0.55Mpa;
Sampling depth: 0～100m (varies depending on geological conditions);
Working Principle
During normal drilling, the principle is the same as that used in current mine drilling, i.e., air enters both the inner pipe of the double-wall drill pipe and the annular space to discharge cuttings; during sampling, the reverse circulation drilling principle is adopted, where compressed air enters through the annular space of the double-wall drill pipe and blows the coal samples cut by the cyclone jet sampling drill bit out through the inner pipe of the double-wall drill pipe under positive pressure, achieving rapid sampling. The transport speed of coal samples in the inner pipe can reach 15m/s.

Zhengzhou Aidi produces and supplies the Coal Mine Deep Hole Fixed-Point Rapid Sampling Device, coal drill cuttings desorption instrument, deep hole sampling device, pressure measuring instrument, geological exploration desorption instrument, borehole flow meter, mine extraction and outburst prevention equipment, true density measuring instrument for coal, gas content measuring instrument, automatic initial gas emission speed measuring instrument, diffusion speed measuring instrument, coal extraction pipeline gas parameter instrument, borehole pulverized coal circulation device, isothermal high-pressure adsorption device, ab value measuring instrument, coal firmness coefficient measuring instrument