Mine explosion-proof extraction type contra-rotating axial flow local ventilatoris an efficient ventilation equipment specially designed for explosive environment such as coal mine underground. The core is suitable for dangerous scenes containing gas (concentration 3%) and coal dust. Through extraction ventilation principle, dirty air and dust are discharged, and fresh air is introduced synchronously to build a safe breathing environment for underground operation.  

 Mine explosion-proof extraction type counter-rotating axial flow local fanadopts double-stage impeller counter-rotation design, two-stage impeller counter-rotation and blade number is prime, with three-dimensional flow theory optimized imitation airfoil twisted blade, not only to achieve double increase in wind pressure and air volume, but also effectively reduce wake vortex and operating noise, full operating efficiency can reach more than 85%, compared with traditional fans energy saving 20%-30%. The whole machine is equipped with mine explosion-proof motor (explosion-proof mark ExdI Mb). It adopts explosion-proof technology of flow isolation chamber to isolate gas from motor. The blade has been certified by spark friction test. It can operate stably in humid and dusty environment at-20℃~+40℃ and altitude of 1000m.  The structure design is compact and flexible. The main body adopts anti-corrosion steel plate assembly welding structure, which is convenient for underground transportation and installation. It supports two operation modes of counter-rotation and single machine. When the ventilation distance is long, the double-machine linkage can be realized. When the single machine is operated in short distance, the energy consumption can be reduced. Equipped with external compound muffler device, excellent noise control, also equipped with non-stop oil injection and discharge device, to ensure long-term reliable operation.  Widely used in coal mine large and small cross-section roadway excavation ventilation, can be extracted separately local gas accumulation, can also be linked with dust removal equipment to achieve more than 88.8% efficient dust reduction, while adapting to metal mines, tunnels and other underground engineering local ventilation needs, is the core equipment of mine safety production.