| 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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| 08/07/2013 | CN203114318U Operating handle locking device of fully-mechanized coal mining machine |
| 08/07/2013 | CN203114317U Stepping-forward self-moving forepole of mine laneway |
| 08/07/2013 | CN203114316U Sideward pushing device of hydraulic support |
| 08/07/2013 | CN103233762A Two-prop shielding type electro-hydraulic-control top-coal caving hydraulic support |
| 08/07/2013 | CN103233761A Reversed loader moving-assisted large-cycle tunnel advance support bracket |
| 08/07/2013 | CN103233760A Self-propelled rack |
| 08/07/2013 | CN103233759A Hydraulic support positioning machine |
| 08/07/2013 | CN103233758A Method for increasing bracket adjustment height in fully mechanized mining face and hydraulic bracket |
| 08/07/2013 | CN103233757A Thin seam double-unit face centralized transportation roadway end support and coal mining method |
| 08/07/2013 | CN103233756A Fully-mechanized excavating staggering type advance support device |
| 08/07/2013 | CN103233755A Six-prop supporting split base type middle filling support |
| 08/01/2013 | US20130193744 Apparatus for forming an underground tunnel |
| 07/31/2013 | CN203097920U Track-type fully hydraulic leading shoring equipment |
| 07/31/2013 | CN203097919U Vehicle-type hydraulic support for coal mines |
| 07/31/2013 | CN203097918U Jacking hydraulic support of coal mining working face |
| 07/25/2013 | US20130187436 Coal caving cycle |
| 07/24/2013 | CN203081477U Mine hydraulic support |
| 07/24/2013 | CN203081476U Protecting device for hydraulic support |
| 07/24/2013 | CN203081450U Scrapping plate conveyor with hydraulic pillar |
| 07/24/2013 | CN103216252A Roadway advanced supporting supports capable of assisting machinery to move |
| 07/24/2013 | CN103216251A Support moving mechanical arm for roadway |
| 07/24/2013 | CN101970796B Method for automatically creating a defined face opening in plow operations in coal mining |
| 07/24/2013 | CN101403312B Valve device and support frame including the valve device |
| 07/17/2013 | CN203067007U Coal mine hydraulic support telescopic beam device |
| 07/17/2013 | CN203067006U Hydraulic support |
| 07/17/2013 | CN203067005U End hydraulic support |
| 07/17/2013 | CN102269003B Paste filling and supporting integral hydraulic bracket |
| 07/17/2013 | CN102155219B Comprehensive dredging machine |
| 07/16/2013 | CA2550247C Grout pack restraining system |
| 07/10/2013 | CN203050755U Automatic movement type advance support bracket group |
| 07/10/2013 | CN203050754U Self-moving temporary supporting hydraulic support for driving working face |
| 07/10/2013 | CN203050753U 1000L/min hydraulic control one-way valve for coal mine hydraulic support |
| 07/10/2013 | CN203050752U Hydraulic onboard beam carrying device |
| 07/10/2013 | CN103195460A Hydraulic support steering platform |
| 07/10/2013 | CN103195459A Low caving coal support |
| 07/10/2013 | CN103195458A Underground coal mine large channel end socket suspension hydraulic support |
| 07/10/2013 | CN103195457A Supporting method for roadway fully-mechanized drivage operation without withdrawal of roadheader |
| 07/10/2013 | CN103195439A Multifunctional working platform car for tunnel construction |
| 07/10/2013 | CN103195428A Extra-thin coal seam bottom climbing type comprehensive exploitation technology |
| 07/10/2013 | CN103195427A Top-shoveling and bottom-cutting type full-seam mining fully-mechanized coal mining method for extrasoft thick coal seam |
| 07/03/2013 | CN203035218U Electric hydraulic control caving coal hydraulic support |
| 07/03/2013 | CN203035217U Hydraulic support preventing rock burst |
| 07/03/2013 | CN203035216U Self-moving type shed-lifting support |
| 07/03/2013 | CN103184880A Self-moving advance support bracket set |
| 07/03/2013 | CN102392667B Fast installation method of ten-million-ton scale fully mechanized caving face equipment |
| 06/26/2013 | CN203022789U Hydraulic support control device with personal safety protection function |
| 06/26/2013 | CN203022788U Pushing-moving rod coal sweeping device |
| 06/26/2013 | CN203022787U Promoting plate connecting head for fully mechanized mining bracket |
| 06/26/2013 | CN203022786U Hydraulic support coal collecting device |
| 06/26/2013 | CN203022785U Stepping type hydraulic shed lifting device |
| 06/26/2013 | CN203022739U Coal cutting machine for steeply-inclined coal layer, scraper conveyor and hydraulic bracket |
| 06/26/2013 | CN103174449A Coal rock recognition method using coal rock recognition processor |
| 06/26/2013 | CN103174448A In-time supporting method for roadway fully-mechanized excavating operation |
| 06/26/2013 | CN103174447A Supports |
| 06/26/2013 | CN103174446A Inter-support waste rock blocking method and inter-support waste rock blocking device used for coal mine fully-mechanized coal mining working surface |
| 06/26/2013 | CN102261257B Hydraulic support for filling after installation and operating method thereof |
| 06/19/2013 | CN203008948U Pilot operated directional control valve |
| 06/19/2013 | CN203008947U Hydraulic support and bottom adjusting mechanism thereof |
| 06/19/2013 | CN203008946U Hydraulic support |
| 06/19/2013 | CN203008945U Hydraulic support and hinge pin connecting structure thereof |
| 06/19/2013 | CN203008944U Comprehensive fore support for excavation head |
| 06/19/2013 | CN203008943U Cut opening widening advance support bracket |
| 06/19/2013 | CN203008942U Fully-mechanized-face crossheading non-empty-caving forepoling bracket |
| 06/19/2013 | CN203008941U Operating valve group link gear of hydraulic support |
| 06/19/2013 | CN203008940U Hydraulic support capable of adjusting height of operating valve |
| 06/19/2013 | CN203008939U Hydraulic support with bottom lifting device |
| 06/19/2013 | CN203008938U Tail beam structure of top coal caving hydraulic bracket and top coal caving hydraulic bracket |
| 06/19/2013 | CN103161488A Hydraulic support protective side control device and control method thereof |
| 06/19/2013 | CN103161487A Large-dip-angle upward-mining-surface hydraulic support trend stability method |
| 06/19/2013 | CN103161486A Waste rock blocking device and method used for high-dipping coalface |
| 06/19/2013 | CN103161482A Revolving platform for turning around hydraulic support |
| 06/19/2013 | CN101787888B Method of mining coal |
| 06/19/2013 | CN101730786B Shield control device for carrying out the longwall function of a longwall unit in the longwall face working in a mine |
| 06/13/2013 | WO2013083185A1 Method for monitoring an automated sequence of movements of a mining shield used in underground mining |
| 06/13/2013 | US20130149045 Stackable mine rock shields |
| 06/12/2013 | CN202991092U Hydraulic support running device |
| 06/12/2013 | CN202991091U Section-type walking hydraulic support of coal mining machine |
| 06/12/2013 | CN202991090U Small movable hydraulic support device |
| 06/12/2013 | CN202991089U Wireless remote control device for retracement bracket |
| 06/12/2013 | CN202991088U Multi-step-pitch supporting type filling hydraulic support with tail beam |
| 06/12/2013 | CN202991087U Shield support of coal mining machine |
| 06/12/2013 | CN202991086U Self-adaption regulation system for roadway hydraulic support |
| 06/12/2013 | CN202991085U Comprehensive hydraulic support for driving working face |
| 06/12/2013 | CN202991084U Front top beam multi-step filling hydraulic support |
| 06/12/2013 | CN202991083U Hydraulic chock of coal mining machine |
| 06/12/2013 | CN202991082U Roof support device |
| 06/12/2013 | CN202991081U Backstop gangue beam suspension swing beam type gangue filling hydraulic support with side guard plates |
| 06/12/2013 | CN103147780A Pre-support device |
| 06/12/2013 | CN103147779A Overall top beam statically indeterminate hydraulic bracket |
| 06/12/2013 | CN102037215B Shield cap for a shield-type mining support |
| 06/12/2013 | CN101970795B Method for controlling longwall mining operations |
| 06/12/2013 | CN101906983B Tilting prevention device for fully mechanized mining hydraulic support |
| 06/12/2013 | CN101832103B Movable two-arm hanging wall anchor rod and anchor cable construction drill carriage |
| 06/12/2013 | CN101509388B Tunnel ahead support stent |
| 06/12/2013 | CN101245709B Hydraulic prop frame for low position blasting down the roof coal |
| 06/05/2013 | CN202970751U Coal mine hydraulic support column bottom valve |
| 06/05/2013 | CN202970750U Large mining height front and rear top beam coaxial hinge joint filling coal mining hydraulic support |
| 06/05/2013 | CN202970749U Back top beam multi step pitch filling hydraulic support |
| 06/05/2013 | CN202970748U Waste rock filling hydraulic support |
| 05/29/2013 | CN202954829U Mine fully mechanized coal mining face butt joint support |