Patents
Sitemap › E21 - Earth or rock drilling; Mining › E21F - Safety devices, transport, filling-up, rescue, ventilation, or drainage in or of mines or tunnels › E21F 7 - Methods or devices for drawing-off gases with or without subsequent use of the gas for any purpose
Patents for E21F 7 - Methods or devices for drawing-off gases with or without subsequent use of the gas for any purpose (2,187)
12/2012
12/26/2012CN202629352U Plastic-coated welded pipe
12/26/2012CN202628182U Full-automatic water drainer for gas extraction
12/26/2012CN202628181U Gas extraction automatic water discharging device
12/26/2012CN202628164U Polyurea coating layer gas drainage pipe
12/26/2012CN202628163U Soft coal seam gas pressure relief pumping extraction device for ground well drilling
12/26/2012CN202620963U Gas-residue separating device
12/26/2012CN102839989A Deslagging device and water discharge device
12/26/2012CN102839986A Coupling device of gas extraction system and gas extraction system
12/26/2012CN101806224B Method for predicting extraction productivity of underground coal-seam gas
12/19/2012CN202611749U High-position drilling structure
12/19/2012CN202611748U Hole sealing structure
12/19/2012CN202605950U Device for separating gas, water and coal for coal mine gas orifice
12/19/2012CN102829261A Duplex pipe for gas draining and hole sealing by grouting
12/19/2012CN102829234A Electro-hydraulic linkage quick stop valve of mine gas extracting pipeline
12/19/2012CN102828769A Complete oil receiving, pumping and conveying device for pumping and extracting mine gas
12/19/2012CN102828768A Method and system for gas pumping of high-gas coal mines
12/19/2012CN102824808A System for enrichment of coal mine gas by solar energy
12/12/2012CN202596787U Automatic drainage device of coal-mine gas extraction pipe
12/12/2012CN202596774U Connecting sleeve assembly and blowout preventer
12/12/2012CN202596773U Gas and slag separation device used for mine underground gas drainage
12/12/2012CN202596660U Cylindrical kneading type hole sealing bag
12/12/2012CN202596659U Cylinder hole-sealing bag
12/12/2012CN102817633A Device for draining gas by deep hole crack control blasting and precracking method
12/12/2012CN102817632A Method for draining gas of mining layer of mine
12/12/2012CN102817631A Method for draining gas of upper adjacent layer of mine
12/12/2012CN102817630A Gas dust and slag water collector
12/12/2012CN102817627A Adjustable air flow distribution device
12/12/2012CN102182495B Gas dust catcher
12/05/2012CN202578755U Overall linking device of extraction pipelines
12/05/2012CN202578754U Pumping draining device for high-concentration gas of drilled holes
12/05/2012CN202578753U Gas draining pipe for coal mining
12/05/2012CN102808651A Automatic draining device of gas extraction system
12/05/2012CN102808644A Coal and gas co-mining method based on mining fissure elliptic paraboloid zone
12/05/2012CN102116168B Gas drainage system and method for hyposmosis soft coal seams
12/05/2012CN102011606B Reaction type foam hole sealing multi-baffle sealing device
11/2012
11/28/2012CN202560317U 自动放水器及瓦斯抽采系统 Automatically turn on the water and gas drainage system
11/28/2012CN202560301U Negative pressure automatic water-discharge device for coal-mine gas extraction pipeline
11/28/2012CN202560300U 管路储放水装置及瓦斯抽采系统 Drainage pipe storage devices and gas drainage system
11/28/2012CN202560299U Residue-removing drainage joint of gas pipeline
11/28/2012CN202560298U Gas dust slag water collector
11/28/2012CN202560297U Spiral catcher
11/28/2012CN202560296U Drainage drill hole anti-gas device of outburst mine
11/28/2012CN202560157U Grouting device
11/28/2012CN202560095U Airborne outburst prevention drill device
11/28/2012CN102797499A Drainer
11/28/2012CN102797498A Automatic draining system and method for mine gas extraction pipe network
11/28/2012CN102797494A Method for discharging gas through air on fully mechanized coal face
11/28/2012CN102797493A Mechanical blasting automatic gas and water sprayer
11/28/2012CN102094669B Three-dimensional source separated pressure-releasing gas treatment method
11/28/2012CN101532391B In-hole drilling tool integrating drilling, slotting and punching coal seam and using method thereof
11/27/2012US8316966 Method and system for accessing subterranean deposits from the surface and tools therefor
11/21/2012CN202544926U Upper corner retaining wall on working face
11/21/2012CN202544907U Drilling, diversion, dust-settling and gas spray-preventing device
11/21/2012CN202544906U Gas emission device of coal mine
11/21/2012CN202544905U Retreating gas hole packer
11/21/2012CN202544904U Portable liquid filling machine of gas hole packer
11/21/2012CN202544903U Hole packer
11/21/2012CN202544799U Blowout prevention device for safety drilling in coal bed
11/21/2012CN101881149B Heat injection drilling and sealing method of heating coalbed
11/14/2012CN202531218U Single-port negative pressure automatic drainage device of pumping-releasing gas pipeline
11/14/2012CN202531217U Automatic residue and water discharging device
11/14/2012CN202531213U Dust remover for automatic deslagging hole
11/14/2012CN202531205U Intelligent local ventilation system in pit of coal mine
11/14/2012CN202531064U Dust catcher of water jet spiral slag discharging hole
11/14/2012CN102777206A Mining drill gas drainage device
11/14/2012CN102777205A Method for determining spatial position of horizontal well for gas drainage in worked-out area
11/14/2012CN102182499B Hydrofracturing-based method and equipment for diminishing dust and eliminating outburst of coal bed
11/14/2012CN101922309B Method for preventing mine gas from exploding and implementation device thereof
11/07/2012CN202520370U Draining mechanism of gas extraction pipe
11/07/2012CN202520369U Gas outburst tunnel crosscut coal uncovering construction system
11/07/2012CN202520368U Water and recrement discharger used in gas extraction operation
11/07/2012CN202520352U Large-cross section gas outburst tunnel ventilating system
11/07/2012CN202520225U Gas drainage drill with flap valve on center hole
11/07/2012CN102767836A Device for utilization of combustion heat energy of ventilation air methane
11/07/2012CN102767389A Hole packer for drawing out gas and injecting slurry
11/07/2012CN102182397B Multi-angle coal petrography drilling machine
11/07/2012CN102022134B Drilling, pressing and vibrating combined pressure-relieving coal bed gas exploitation method
11/07/2012CN101892842B Method for uncovering coal in vertical shaft
10/2012
10/31/2012CN202510849U Special coating composite steel pipe for coal mine under-well gas drainage
10/31/2012CN202509058U Tri-state separator for gas extraction pipeline
10/31/2012CN102061933B Long drilling positioning construction process
10/31/2012CN101936178B Mixer of coal mine extracted gas and ventilation gas
10/30/2012US8297377 Method and system for accessing subterranean deposits from the surface and tools therefor
10/30/2012US8297350 Method and system for accessing subterranean deposits from the surface
10/24/2012CN202500607U Device for drilling and draining towards holes under coal layer
10/24/2012CN202500597U An apparatus for periodically performing high-pressure gas fracturing and improving air permeability and drainage effect through multiple holes
10/24/2012CN202500519U Gas extraction drilling hole sealing apparatus
10/24/2012CN102748072A Automatic slag and water discharging machine
10/24/2012CN102748065A Method for extracting gas of blank zone of working face with large mining length
10/24/2012CN102748064A Large-mining-height fully-mechanized caving face gas control method
10/24/2012CN102747980A Expansion type multi-grade pressurized rapid hole sealing technology
10/24/2012CN102747965A Lifting device for deep hole drill rig
10/24/2012CN102747953A Multiple step type drilling and protecting integrated system and process for soft coal seam
10/24/2012CN102071962B Method for sealing downward hole
10/24/2012CN102011605B Low-concentration gas and ventilation air methane thermal oxidation generating system and method of coal mine
10/23/2012US8291974 Method and system for accessing subterranean deposits from the surface and tools therefor
10/17/2012CN102733872A Ventilation air methane oxidation power generation system
10/17/2012CN102733844A Hole sealing structure and hole sealing method as well as expansive cement for sealing hole
10/17/2012CN102733843A Method and experiment system for simulating tunneling gas migration rule of coal mine
10/10/2012CN202483613U Polyethylene drainage gas pipe for underground coal mine
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 ... 22