| Patents for E21D 23 - Mine roof supports for step-by-step movement, e.g. in combination with provisions for shifting of conveyers, mining machines, or guides therefor (3,544) |
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| 11/05/2009 | DE102008021890A1 Pressure control valve for use in e.g. hydraulic assembly in tunnel construction, has valve piston regulated by axially running blind hole, and valve piston comprising outer wall causing differential pressure that unloads valve spring |
| 10/29/2009 | WO2009129782A1 Screen |
| 10/21/2009 | CN201330615Y Novel combined hydraulic bracket |
| 10/21/2009 | CN201330613Y High-pressure large-flow-rate safety valve |
| 10/21/2009 | CN101560885A Portable manual hydraulic support |
| 10/21/2009 | CN101560884A Pull-type suspension hydraulic support system |
| 10/21/2009 | CN101560883A Gob-side entry retaining work mould base |
| 10/14/2009 | CN101555800A Compound front beam hydraulic support and applications thereof |
| 10/14/2009 | CN101555795A Method for preventing flying refuse during large-inclination-angle coal bed mining |
| 10/07/2009 | CN201321866Y Mine hydraulic support articulated top beam |
| 10/07/2009 | CN201321865Y Top-beam connecting mechanism of combined slipping top-beam hydraulic support |
| 10/07/2009 | CN201321864Y Modular-type hydraulic bracket |
| 10/07/2009 | CN201321862Y hydraulic two-way lock |
| 09/30/2009 | CN201318187Y Walking hydraulic drive unit |
| 09/30/2009 | CN201318186Y Hydraulic support in triangular space |
| 09/30/2009 | CN201318185Y Advanced support machine |
| 09/30/2009 | CN201318184Y Barrel type hydraulic support |
| 09/30/2009 | CN201318183Y Closed type combined hydraulic support |
| 09/30/2009 | CN101545377A Suspended combined support |
| 09/24/2009 | DE102008009721A1 Valve device for controlling multiple brackets in underground tunnel, has distributor module comprising longitudinal holes and multiple transverse holes, and reflowing pipeline connected to two connecting pipes |
| 09/23/2009 | CN201314239Y End support for roadway caving |
| 09/23/2009 | CN201314238Y Great mining height hydraulic bracket for top coal caving |
| 09/16/2009 | CN201310372Y Rapid supply-return liquid system of big cylinder diameter vertical column of hydraulic support |
| 09/16/2009 | CN201310371Y Hydraulic support thrust gear |
| 09/16/2009 | CN201310370Y Large mining height shield hydraulic support |
| 09/16/2009 | CN201310369Y Tertiary side wall protection structure of hydraulic support |
| 09/16/2009 | CN201310368Y Base for shield support and shield support |
| 09/16/2009 | CN201310367Y Dual protection gangue blocking structure of hydraulic support |
| 09/10/2009 | DE102005013062B4 Verfahren zum Steuern einer Strebausrüstung in Betrieben des untertätigen Steinkohlenbergbaus Method for controlling a longwall equipment in companies operating under the coal industry |
| 09/09/2009 | CN201306180Y Filling and supporting hydraulic support |
| 09/09/2009 | CN201306179Y Filling and supporting hydraulic support with retaining device |
| 09/09/2009 | CN201306178Y Filling and supporting hydraulic support with moveable support plate |
| 09/09/2009 | CN201306177Y Filling and supporting hydraulic support with novel bar |
| 09/09/2009 | CN201306176Y Filling and supporting hydraulic support with compaction mechanism |
| 09/09/2009 | CN101526007A Underground coal bunker cleaning robot |
| 09/09/2009 | CN101526004A Large inclination-angle low-position top coal hydraulic bracket |
| 09/09/2009 | CN100538015C Foreset control device |
| 09/09/2009 | CN100538014C Method for preventing hitch of hydraulic support from being filled by crushed gangue |
| 09/02/2009 | CN201301722Y Dust retainer applied between brackets at fully mechanized coal mining face |
| 09/02/2009 | CN101519973A Hydraulic bracket with interconnected top and bottom |
| 09/02/2009 | CN101519972A One-way sequence valve and bracket hydraulic sequence control system using same |
| 08/27/2009 | WO2009103309A1 Method for automatically creating a defined face opening in plow operations in coal mining |
| 08/27/2009 | WO2009103307A1 Method for automatically creating a defined face opening in longwall coal mining operations |
| 08/27/2009 | WO2009103306A1 Method for stabilizing the shield column in a longwall mining operation conducted along the seam slope |
| 08/27/2009 | WO2009103305A1 Method for controlling longwall mining operations by identifying boundary layers |
| 08/27/2009 | WO2009103304A1 Method for the controlled maintaining of a distance between the roof and the face in longwall mining operations |
| 08/27/2009 | WO2009103303A1 Method for controlling longwall mining operations |
| 08/26/2009 | CN101514713A Valve device |
| 08/26/2009 | CN101514635A Valve device |
| 08/26/2009 | CN101514633A Non-roadside supporting gob-side entry retaining process |
| 08/20/2009 | DE102008009722A1 Valve arrangement for plunger of support frame in mining industry, has check valves connected at output side with piston surface line of plunger, where inputs of check valves are connected with return line and/or control line, respectively |
| 08/19/2009 | CN101509388A Tunnel ahead support stent |
| 08/19/2009 | CN101509387A Tunnel ahead support stent |
| 08/13/2009 | US20090202310 Support for underground mining and tunnel construction |
| 08/12/2009 | CN201288581Y Pushing rod for low coal seam mining rack |
| 08/12/2009 | CN201288580Y Bottom seat structure for low coal seam mining |
| 08/12/2009 | CN201288579Y Self-moving type end bracket |
| 08/12/2009 | CN201288578Y Hydraulic rack for small stage coal seam |
| 08/12/2009 | CN201288577Y Combined rack with hanging mechanism for guidance moving beam |
| 08/05/2009 | CN101498224A Fully-mechanized mining working surface hydraulic support transport vehicle |
| 07/30/2009 | US20090191011 Supporting device for an advance working or winning machine |
| 07/29/2009 | CN201280943Y Improved structure of crawler belt walking hydraulic support |
| 07/29/2009 | CN201280942Y Friction plate integrally welding foundation for crawler belt walking hydraulic support |
| 07/29/2009 | CN201280941Y Combination suspension moving hydraulic support for embeddedly connecting integral joist and integral top beam by three-point suspension |
| 07/29/2009 | CN101493014A Coal mine self-moving sectional shelf-unit |
| 07/29/2009 | CN100519988C Mining machine and mining method |
| 07/23/2009 | WO2009089769A1 A light-duty hydraulic bracket |
| 07/22/2009 | CN201277052Y Assembled stand |
| 07/15/2009 | CN201273195Y Position detection apparatus of fully-mechanized mining face coal mining machine |
| 07/15/2009 | CN201273194Y Combined hydraulic press frame |
| 07/15/2009 | CN101482025A Light hydraulic support |
| 07/15/2009 | CN100513746C Timbering and walling control for controlling the movements of timbering and walling units in the coal face of a mine |
| 07/01/2009 | CN201265425Y Mining advanced stand |
| 07/01/2009 | CN100507212C Coal face support in a mine |
| 07/01/2009 | CN100507211C Light hydraulic support for cannon sampled thin coal layer |
| 06/25/2009 | WO2009076710A1 An apparatus for forming an underground tunnel |
| 06/25/2009 | CA2708373A1 An apparatus for forming an underground tunnel |
| 06/24/2009 | CN201262093Y Pre/post-positioned caving coal cap stand |
| 06/24/2009 | CN201262092Y Position limiter for mining hydraulic support |
| 06/24/2009 | CN101463730A Self-moving device of protection stand |
| 06/24/2009 | CN101463729A Hydraulic support for large-mining height caving coal |
| 06/24/2009 | CN101463728A Hoisting stand for mining |
| 06/23/2009 | US7549709 Mining device |
| 06/17/2009 | CN201258751Y Electrohydraulic control system for hydraulic support and valve control device thereof |
| 06/17/2009 | CN201258750Y Frame and slider integration light-duty hydraulic support |
| 06/17/2009 | CN101457652A Overlarge mining height hydraulic support |
| 06/11/2009 | WO2009024136A3 Stope supporting structure for face support in mines |
| 06/10/2009 | CN201255000Y Support shifting beam of downhole suspension device for coal mine |
| 06/10/2009 | CN201254999Y Blast mining rider light-duty hydraulic support |
| 06/10/2009 | CN101451439A Hydraulic support |
| 06/10/2009 | CN100497888C Machine-carried forepoling device |
| 06/03/2009 | CN100494632C Coupling mechanism used by face support controller |
| 05/27/2009 | CN201246177Y Cannon extraction working face hydraulic support |
| 05/27/2009 | CN101440711A Large extraction high caving roof coal hydraulic support |
| 05/20/2009 | CN201241717Y Large flow fluid control safe valve |
| 05/20/2009 | CN101435336A Three-stage side protecting mechanism of hydraulic support |
| 05/20/2009 | CN101435335A Dual-protection stone-blocking structure of hydraulic support |
| 05/20/2009 | CN100489272C Top plate control method of Wangeviry coal mining region |
| 05/20/2009 | CN100489271C Electrohydraulic controlled reversal valve in use for hydraulic support |
| 05/13/2009 | CN201236720Y Waste rock blocking apparatus |