| Patents for E21F 1 - Ventilation of mines or tunnels; Distribution of ventilating currents (2,288) |
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| 06/08/2011 | CN102086765A High-sublevel multi-layer mining method of ultrathin copper ore body |
| 06/08/2011 | CN101672193B Stepless adjustment insert plate type windscreen |
| 06/08/2011 | CN101550838B Centralized waste gas discharging method used in longitudinally ventilated road tunnel |
| 06/08/2011 | CN101545378B Device for centrally discharging waste gas by adopting a middle air shaft for road tunnel |
| 06/08/2011 | CN101418698B Mine tunnel arc changing air door |
| 06/01/2011 | EP2326797A1 Ventilation system for railway tunnels |
| 06/01/2011 | CN201851152U Wind power locking device |
| 06/01/2011 | CN201851148U Simple tunnel dust settling station |
| 06/01/2011 | CN201851143U Automatic closing air door spindle |
| 06/01/2011 | CN201848187U Mine dry-type small cyclone composite filter dust remover |
| 06/01/2011 | CN102080563A Air door whistling and vehicle blocking device for mine main transportation roadway |
| 06/01/2011 | CN102080562A Non-power driven harmful gas filtering device |
| 06/01/2011 | CN102080561A Group count determining and stationing universal method of pollutant purification ventilation system for road tunnel |
| 06/01/2011 | CN102080560A Tunnel wind room relay ventilation method for long blind heading |
| 06/01/2011 | CN102080559A Exhaust airway-free purifying exhaust structure for road tunnel |
| 06/01/2011 | CN102080558A Purification and exhaust method for road tunnel without air shaft |
| 06/01/2011 | CN102079826A Nano wind tube and preparation method thereof |
| 05/25/2011 | CN201843635U Smoke proof device for tunnel safe passage |
| 05/25/2011 | CN201843632U Forward wind and backward wind dual-purpose automatic wind door for mine |
| 05/25/2011 | CN201843631U Y-shaped wind-sock connector |
| 05/25/2011 | CN201843630U Road tunnel air purification and exhaust structure without exhaust shafts |
| 05/25/2011 | CN102071958A Inverse Y-shaped ventilation method for coal mining working face |
| 05/25/2011 | CN101629490B Full air pressure air borrowing method for coal mine underground tunneling roadway |
| 05/18/2011 | CN201836127U Banana-shaped tunnel jet fan |
| 05/18/2011 | CN201835856U Wet-type dedusting fan dehydration device |
| 05/18/2011 | CN201835855U Control valve for multi-directional ventilation |
| 05/18/2011 | CN201835854U Rubber wind tube capable of resisting bombard |
| 05/18/2011 | CN201835853U Front door locking structure of fan controller for mine |
| 05/18/2011 | CN102061676A High-efficiency jet (snow removing) machine technology |
| 05/11/2011 | CN201826882U Porous pressure-relief explosion-resistant automatic damper for mines |
| 05/11/2011 | CN201826881U Coal mine methane delivery connecting device |
| 05/11/2011 | CN201826880U Arrangement structure for smoke prevention system of tunnel secure channel |
| 05/11/2011 | CN101586467B Road tunnel ventilation testing device |
| 05/04/2011 | CN201818321U Dust remover |
| 05/04/2011 | CN201818319U Underground gas-compressing deslagging drilling dust remover for coal mine |
| 05/04/2011 | CN101285395B Flexible pneumatic air door of mine laneway |
| 04/27/2011 | CN201810334U Air return corner gas system utilizing compressed air spray |
| 04/27/2011 | CN201810332U Underground ventilating and heating system |
| 04/27/2011 | CN201810331U Opener of underground air door for mines |
| 04/26/2011 | CA2677432C Ventilation duct assembly |
| 04/20/2011 | EP2310624A1 Method for removing a consumable downhole tool specification |
| 04/20/2011 | CN201802436U Multi-parameter detector for mine ventilation |
| 04/20/2011 | CN201802435U Coal mine ventilation system |
| 04/20/2011 | CN101571044B Subway shield gas tunnel construction method |
| 04/14/2011 | WO2011042980A1 Tunnel ventilation control system of two-way tunnel using jet fan |
| 04/13/2011 | EP2307814A1 Duct means for an air flow or a gas flow and a method for manufacturing, handling and mounting said duct means |
| 04/13/2011 | CN201794604U Underground tunneling roadway ventilation system |
| 04/13/2011 | CN201794603U Air shaft for avoiding tunnel cable from being destroyed |
| 04/13/2011 | CN201794602U Optical cable ventilation shaft for preventing tunnel from being damaged |
| 04/06/2011 | CN201786381U Recovery device for separating and enriching gas discharged from return current system of mine |
| 04/06/2011 | CN201786375U Air barrier for controlling underground air flow in coal mines |
| 04/06/2011 | CN201786374U Ventilating device for driving face |
| 04/06/2011 | CN102003205A Compressed air system of underground shelter |
| 04/06/2011 | CN102003202A Safety emergency rescue and escape system for mine and construction steps thereof |
| 04/06/2011 | CN102003200A Small mining combined dust remover |
| 04/06/2011 | CN102003186A Double-roadway tunneling construction process |
| 03/30/2011 | EP2302306A2 Louvre damper system |
| 03/30/2011 | CN201778834U High-air-pressure air door pressure releasing opening device |
| 03/23/2011 | CN201771535U Non-pressure air door locking device |
| 03/23/2011 | CN201771534U Mining compressed air distributor |
| 03/23/2011 | CN201771533U Comprehensive mine return air treatment and diffusion tower |
| 03/23/2011 | CN201771532U Dual-purpose device for automatically regulating wind volume and discharging coal |
| 03/23/2011 | CN101418702B Gas adding system of coal mine ventilation air methane oxidation device |
| 03/22/2011 | CA2472545C Mine door system including an air pressure relief door |
| 03/17/2011 | WO2011030997A1 Tunnel air-exchange device using a natural air-exchange method |
| 03/16/2011 | CN201763395U Intrinsically safe-type ventilation parameter measurement device for mining |
| 03/16/2011 | CN201763385U System for belt passing through air door wall |
| 03/16/2011 | CN201763367U Non-contact type air duct sensor for mining |
| 03/16/2011 | CN101413400B Tunneling operation simple emergent life-saving connection device and mounting method thereof |
| 03/02/2011 | CN201753612U Mine ventilation air contranatant oxidation device with smoke pumping device |
| 03/02/2011 | CN201753611U Intelligent monitoring and controlling device for mine ventilation |
| 02/23/2011 | CN101718208B Ventilating system arranged in U+H shape under coal mine |
| 02/16/2011 | CN201747633U Frequency-converting and speed-regulating local fan |
| 02/16/2011 | CN201747396U Coal mine underground pneumatic air-door locking control device |
| 02/16/2011 | CN201747395U Air duct |
| 02/16/2011 | CN101973500A Automatic lifting device of heavy-load roof door |
| 02/16/2011 | CN101532389B Control device of local fan of heading face and control method thereof |
| 02/16/2011 | CN101302931B Method for extracting rim angle coal and re-extracting after warehouse coal extracting |
| 02/16/2011 | CN101285394B Tunnel ventilation communication system and its wind power distribution and regulating method |
| 02/09/2011 | CN201738949U Mining-use wingspan-type ventilation wind pressure monitoring and alarming system with functions of automatic start and stop |
| 02/09/2011 | CN201738942U Damp sheet group of mine roadway |
| 02/09/2011 | CN101970799A Method for controlling longwall mining operations, taking into account air and air conditioning resources |
| 02/09/2011 | CN101967991A Dewatering device of wet dust removing blower |
| 02/09/2011 | CN101463731B High-speed thermal circulation air curtain construction method for tunnel portal |
| 02/09/2011 | CN101353963B Vacant field coal excavating method of high-dipping coal bed slotted hole blasting unmanned operation working face |
| 02/02/2011 | CN201730636U Coal mine anti-outburst anti-aircurrent inversion device |
| 02/02/2011 | CN201730635U Connecting device of coal mine underground local fan with air drum |
| 02/02/2011 | CN101963065A Compressed air slag discharge drilling deduster for use under coal mines |
| 02/02/2011 | CN101349158B Energy-saving environment protection type tunnel automatic exhauster |
| 01/26/2011 | CN201723246U Ventilating structure for pumping and exhausting gas at coal face |
| 01/26/2011 | CN201723239U Airflow regulating device of local fan |
| 01/26/2011 | CN201723238U Air quantity switch of air tube |
| 01/26/2011 | CN201723237U Air regulating device for coal mine underground tunneling working surface |
| 01/26/2011 | CN201723236U Wind-driven ventilation equipment for underground engineering |
| 01/26/2011 | CN101311211B Polyethylene pipes for underground mine use |
| 01/19/2011 | CN201715173U Novel subway tunnel fan soft connection device |
| 01/19/2011 | CN201714417U Shock-resistant rubber ventilating duct |
| 01/12/2011 | CN201705390U Wind-leakage-proof drainage system used for underground fan room |
| 01/12/2011 | CN201705383U Driving mechanism of heavy-duty gate |
| 01/12/2011 | CN201705382U Heavy-load gate |