Working Principle of the SDQ-50 Deep Hole Rapid Sampling Device

Working Principle of the SDQ-50 Deep Hole Rapid Sampling Device:
During normal drilling, it operates similarly to the drilling principles currently used in mines, where both the inner pipe of the double-wall drill pipe and the annular space simultaneously convey air and discharge cuttings. For sampling, the reverse circulation drilling principle is employed: compressed air enters through the annular space of the double-wall drill pipe and blows the coal samples cut by the cyclone jet sampling bit out under positive pressure through the inner pipe of the double-wall drill pipe, achieving rapid sampling.
The transport speed of coal samples in the inner pipe of the SDQ-50 Deep Hole Rapid Sampling Device can reach 15 m/s.
Technical Requirements for the SDQ-50 Deep Hole Rapid Sampling Device
Drill Pipe: Diameter 50 mm, torque ≥ 4000 N/m, equipped with φ25 quick-connect couplings
Drill Bit: Diameter 75 mm, length not less than 200 mm
Sampling Speed: >250 g/min;
Rated Working Air Pressure: 0.55 MPa;
Rated Working Air Volume: 4–5 m³/min (standard conditions);
Rated Sampling Depth: 0–50 m (varies depending on geological conditions);
Compatible Drill Rig Requirements: Capable of clamping Φ50 mm drill pipe, rear-mounted tail whip; equipped with φ25 and φ32 quick-connect couplings Sampling Device Deep Hole Rapid Sampling Device Coal Seam Gas Sample Sampling Device Coal Seam Gas Sampling Device
The SDQ-50 Deep Hole Rapid Sampling Device complies with GB/T23250-2009 "Direct Determination Method of Coal Seam Gas Content Underground." The core of determining coal seam gas content lies in the estimation of loss, with the current technical bottleneck being sampling. The deep hole rapid sampling device standard requires "fixed-point sampling, with a sampling time of less than 5 minutes."

Zhengzhou Aidi produces and supplies coal drill cuttings desorption instruments, deep hole sampling devices, pressure measuring instruments, geological exploration desorption instruments, borehole flow meters, mine gas extraction and outburst prevention equipment, true density measuring instruments for coal, gas content measuring instruments, automatic initial gas emission speed measuring instruments, diffusion speed measuring instruments, coal gas extraction pipeline gas parameter instruments, and borehole coal powder circulation devices.