CN104088639A - Large-inclination angle thick coal seam strike long-wall workface large-mining height mining method - Google Patents

Large-inclination angle thick coal seam strike long-wall workface large-mining height mining method Download PDF

Info

Publication number
CN104088639A
CN104088639A CN201410290023.0A CN201410290023A CN104088639A CN 104088639 A CN104088639 A CN 104088639A CN 201410290023 A CN201410290023 A CN 201410290023A CN 104088639 A CN104088639 A CN 104088639A
Authority
CN
China
Prior art keywords
coal
work plane
workface
mining
support
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201410290023.0A
Other languages
Chinese (zh)
Inventor
伍永平
李方立
解盘石
黄国春
贠东风
陈建杰
王红伟
尤国俊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian University of Science and Technology
Original Assignee
Xian University of Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xian University of Science and Technology filed Critical Xian University of Science and Technology
Priority to CN201410290023.0A priority Critical patent/CN104088639A/en
Publication of CN104088639A publication Critical patent/CN104088639A/en
Pending legal-status Critical Current

Links

Abstract

The invention discloses a large-inclination angle thick coal seam strike long-wall workface large-mining height mining method. The method comprises the following steps: selecting a false-inclined strike long-wall workface as an actual mining workface of a large-inclination angle thick coal seam, wherein the included angle of the workface and a real inclined workface is about 0-7 degrees and the inclination length of the workface is larger than 80m; mounting a special totally-closed lower end bracket and a tail bracket on a conveying alley end at the lower end of the workface, sequentially arranging a scraper conveyer, a coal miner and a two-column covered type or four-column covered type hydraulic bracket along the inclination direction of the workface, mining the large-inclination angle coal seam by taking the strike of the large-inclination angle coal seam as a push direction, allowing the coal miner on the workface to obliquely cut triangular coal by use of a feed cutter and move down, namely cutting the coal from an air returning alley to the conveying alley, moving upwards, namely clearing away float coal from the conveying alley to the air returning alley, and sequentially moving the brackets and pushing forwards the conveyer from bottom to top, wherein one technical loop is finished after the float coal is cleared by the coal miner. The method disclosed by the invention has the beneficial effect of maintaining the stability of a system during a mining process.

Description

A kind of face in steep thick coal seam moves towards the large mining height exploitation method in coal wall
Technical field
The invention belongs to seam mining technical field, relate to a kind of face in steep thick coal seam and move towards the large mining height exploitation method in coal wall.
Background technology
Large-inclination-angle coal bed is to tilt and the part of steeply pitching seam, generally refers to that burying inclination angle is the coal seam of 35~55 °, is the generally acknowledged difficult mining coal seam in coal seam and international mining circle of the special mode of occurence of a class.When longwell (be in tilted layout, move towards advance) working face mining is moved towards in employing, caved gangue non-uniform placement, bearing pressure asymmetric distribution, bottom deformation and destruction possibility in work plane goaf along inclined direction increase and work plane " top board-support-base plate " system unstability and cause catastrophe etc.
Due to large-inclination-angle coal bed These characteristics, at present, fully-mechanized mining can only be applied among the medium-thickness seam of 1.3~3.5m, high seam generally adopts Coal Mining Equipment Complement, these class methods exist that roof control difficulty, top coal coal caving ratio are low, work plane " support-country rock " (top board-support-base plate) stability of a system is difficult for the problems such as guarantee, cannot ensure safety and high efficiency.Solve above face in steep thick coal seam and move towards the series of problems that longwell comprehensive mechanical top coal caving exists, must arrange and work plane relevant equipment is started with and studied from work plane, adopt the large-inclination-angle coal bed method of moving towards the large mining height of longwell (full-seam mining) to exploit such coal seam.
Summary of the invention
The object of the present invention is to provide a kind of face in steep thick coal seam to move towards the large mining height exploitation method in coal wall, solved the existing stability of a system and be difficult for the problem ensureing.
The technical solution adopted in the present invention is to carry out according to following steps:
Step 1: work plane is determined: select a puppet to face upward and tiltedly move towards coal wall as the actual exploitation of face in steep thick coal seam work plane, the angle of work plane and true dip work plane is about 0 °~7 °, and work plane tilt length is greater than 80m;
Step 2: work plane is arranged: at the transport heading of work plane lower end, totally-enclosed special lower end support and last person's support are installed, arrange successively drag conveyor, coal-winning machine and two column protected type or four post support shield type hydraulic support along work plane incline direction, return air heading at work plane upper end is installed crab bearer, upper end support, in transport lane, be provided with advance support and support lower end support, advance support is set in return airway and is used for supporting upper end support;
Step 3: seam mining method: adopt the exploitation of fully-mechanized mining full-seam mining exploitation method, taking the determined work plane of step 1 as actual exploitation work plane, and exploit large-inclination-angle coal bed taking large-inclination-angle coal bed trend as direction of propulsion, the coal-winning machine of work plane stays the Triangle Coal feed of cutting sth. askew descending, from return airway to transport lane direction coal cutting, up from transporting lane to the clear float coal of return airway direction, order is moved frame, pushing and sliding from bottom to top, unit advance and coal-winning machine cut the dark 0.6m of being, and the clear complete float coal of coal-winning machine completes a process cycles.
Further, in described step 2, in the time that face length changes, setting up flexible transition supporting at work plane upper end place regulates.
While the invention has the beneficial effects as follows maintenance exploitation, system is stable.
Brief description of the drawings
Fig. 1 is that puppet is faced upward slanting face layout schematic diagram;
Fig. 2 is that work plane of the present invention is arranged top view;
Fig. 3 is the A-A sectional drawing of Fig. 2.
In figure: 1-return airway, 2-transports lane, 3-work plane, 4-goaf, 5-advance support; 6-upper end support, 7-crab bearer, 8-last person's support, 9-lower end support, 10-hydraulic support, 11-coal-winning machine, 12-drag conveyor, 13-seat earth, 14-coal seam, 15-roof.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The method that the present invention adopts is: step 1: work plane 3 is determined: work plane 3 is that puppet is faced upward slanting face, select a puppet to face upward and tiltedly move towards coal wall as the actual exploitation of described face in steep thick coal seam work plane, puppet is faced upward slanting face 3 and is about 0 °~7 ° with the angle of true dip work plane, and work plane tilt length is greater than 80m;
As shown in Figure 1, AD is that puppet is faced upward slanting face 3, and work plane tilt length is greater than 80m, and ∠ ACB is true dip angle, i.e. seam inclination α, and ∠ ADB is pseudo-inclination angle, ∠ CAD is that pseudo-slanting face is 0 °~7 ° with moving towards angular separation (abbreviation moves towards angle), L veryfor true dip length, L pseudo-for pseudo-tilt length, be greater than 80m, DC direction is that work plane moves towards direction of propulsion, CA direction is incline direction.
Step 2: the layout of mining equipment: in actual recovery process, pseudo-slanting face angle ∠ CAD, between 0 °~7 °, has reduced the downslide of large mining height process medium-height trestle and equipment, meanwhile, coal wall caving possibility can appropriately reduce large mining height time.
Wherein, in the goaf 4 in Fig. 2, Fig. 3, seat earth 13, coal seam 14 and roof 15 have formed whole bank.
As Fig. 2, shown in 3, face upward in puppet transport lane 2 ends that slanting face is work plane 3 lower ends, totally-enclosed special lower end support 9 and last person's support 8 are installed, arrange successively drag conveyor 12 along work plane incline direction, coal-winning machine 11 and two column protected type or four post support shield type hydraulic support 10, return airway 1 end at work plane 3 upper ends is installed crab bearer 7, upper end support 6, in transport lane 2, be provided with advance support 5 and support lower end support 9, be used for supporting upper end support 6 at the interior advance support 5 that arranges of return airway 1, in the time of work plane 3 change in length, can set up at work plane 3 upper end places flexible transition supporting regulates, the face 3 of finishing the work is arranged,
Step 3: seam mining method: adopt the exploitation of fully-mechanized mining full-seam mining exploitation method, face upward slanting face as actual exploitation work plane taking the determined puppet of step 1, and exploit large-inclination-angle coal bed taking described large-inclination-angle coal bed trend as direction of propulsion; Work plane 3 direction of propulsion are shown in Fig. 2, the coal-winning machine 11 of work plane 3 stays the Triangle Coal feed of cutting sth. askew descending, from return airway 1 to transport lane 2 direction coal cuttings, up from transporting lane 2 to the clear float coal of return airway 1 direction, order is moved frame, pushing and sliding from bottom to top, unit advance and coal-winning machine cut the dark 0.6m of being, and the clear complete float coal of coal-winning machine completes a process cycles.
And in actual recovery process, adopt force piece to carry out synchronous supporting to reality exploitation work plane, described force piece is two column protected type or four post support shield type hydraulic support, support adopts high thrust jack and box side guard board, adjust jack linkage or separately stretch out or retract at the end, be convenient to align support, and use the anti-coal wall caving of large area face guard, protective baffle plate Jiang Ji road and sidewalk separate, work plane coal breakage adopts double-ended shearer, work plane transport adopts large transport power drag conveyor, work plane utilizes " three machines " (coal-winning machine, drag conveyor, support) coordinate and install additional special equipment prevent mining face equipment glide.
The above-mentioned large-inclination-angle coal bed large mining height exploitation method in coal wall of moving towards, is characterized in that:
(1) as shown in Figure 3, one time mining height H reaches the coal seam of 35 °~55 ° at the seam inclination a of 3.5~5.0m, is applicable to exploit thick and special thick large-inclination-angle coal bed.
(2) work plane two column protected type or four post support shield type hydraulic support, support adopts high thrust jack and box side guard board, and working resistance reaches 6500kN, and adjust jack linkage or separately stretch out or retract at the end, is convenient to align support; Bracket support height 2.2~5.0m, support self width b is 1.75~2.0m, and uses the anti-coal wall caving of large area face guard (1.75~2.0m × 1.5m), protective baffle plate Jiang Ji road and sidewalk to separate; Work plane double-ended shearer diameter of cylinder D is 1.8~2.3m; Working face conveyor power is not less than 900kW; Work plane utilizes " three machines " (coal-winning machine, drag conveyor, support) to coordinate and installs special equipment additional and prevents that mining face equipment from gliding.
Described force piece is two column protected type or four post support shield type hydraulic support 10, support adopts high thrust jack and box side guard board, adjust jack linkage or separately stretch out or retract at the end, be convenient to align support, and use the anti-coal wall caving of large area face guard, protective baffle plate Jiang Ji road and sidewalk to separate, work plane coal breakage adopts double-ended shearer 11, work plane transports to adopt large transport power drag conveyor 12, work plane utilization " three machines " (coal-winning machine, drag conveyor, support) to coordinate and install special equipment additional and prevents that mining face equipment from gliding.
To sum up, in actual recovery process, actual exploitation work plane is that pseudo-oblique angle ∠ CAD is that the puppet of 0 °~7 ° is faced upward tilted direction and arranged, and advances along coal seam; Actual exploitation work plane is selected the two column protected type or the four post support shield type hydraulic support that are added with special shielding equipment, and supporting double-ended shearer, large transport power drag conveyor, lower end support etc.Ensure that the large mining height of high inclination-angle moves towards coal wall safety and high efficiency.
The above, be only preferred embodiments of the present invention, not the present invention imposed any restrictions, and every any simple modification of above example being done according to invention technical spirit, change and equivalent structure change, and all still belong in the protection domain of technical solution of the present invention.
The present invention has the following advantages:
(1) the simple constructability of reasonable in design, exploitation method.
(2) ensured that a large-inclination-angle coal bed mining height reaches 3.5~5.0m, increased substantially the resource recovery of exploiting such thickness coal seam, simplified process for stoping.
(3) under the high inclination-angle condition adopting, large mining height hydraulic support and outfit can ensure the stability in mining height 3.5~5.0m, 35 °~55 ° work planes in inclination angle " support-country rock " system, and while having overcome employing top coal caving, " top board-support-base plate " system element lack the support equipment downslide causing and topples over problem.
In sum, the present invention is reasonable in design, exploitation method is simple, easy construction and the large mining height hydraulic support adopting and outfit reasonable in design, easy and simple to handle, result of use good, can effectively solve that the rate of extraction existing in existing face in steep thick coal seam top coal caving is low, the practical problem such as complex process, support system are unstable.Exploitation method is simple, easy construction and the large mining height hydraulic support adopting and outfit reasonable in design, easy and simple to handle, result of use good, the practical problem such as can effectively solve that the rate of extraction existing in existing face in steep thick coal seam top coal caving is low, complex process, support system are unstable.

Claims (2)

1. face in steep thick coal seam moves towards the large mining height exploitation method in coal wall, it is characterized in that carrying out according to following steps:
Step 1: work plane (3) is determined: select a puppet to face upward and tiltedly move towards coal wall as the actual exploitation of face in steep thick coal seam work plane, work plane (3) is about 0 °~7 ° with the angle of true dip work plane, and work plane tilt length is greater than 80m;
Step 2: work plane (3) is arranged: at the transport lane (2) of work plane (3) lower end end, totally-enclosed special lower end support (9) and last person's support (8) are installed, arrange successively drag conveyor (12) along work plane incline direction, coal-winning machine (11) and two column protected type or four post support shield type hydraulic support (10), return airway (1) end at work plane (3) upper end is installed crab bearer (7), upper end support (6), in transport lane (2), be provided with advance support (5) and support lower end support (9), advance support (5) is set in return airway (1) and is used for supporting upper end support (6),
Step 3: seam mining method: adopt the exploitation of fully-mechanized mining full-seam mining exploitation method, taking the determined work plane of step 1 (3) as actual exploitation work plane, and exploit large-inclination-angle coal bed taking large-inclination-angle coal bed trend as direction of propulsion, the coal-winning machine (11) of work plane (3) stays the Triangle Coal feed of cutting sth. askew descending, from return airway (1) to transport lane (2) direction coal cutting, up from transporting lane (2) to the clear float coal of return airway (1) direction, order is moved frame from bottom to top, pushing and sliding, unit advance and coal-winning machine cut the dark 0.6m of being, the clear complete float coal of coal-winning machine completes a process cycles.
2. move towards the large mining height exploitation method in coal wall according to a kind of face in steep thick coal seam described in claim 1, it is characterized in that in described step 2, setting up flexible transition supporting in the time of work plane (3) change in length at work plane (3) upper end place regulates.
CN201410290023.0A 2014-06-25 2014-06-25 Large-inclination angle thick coal seam strike long-wall workface large-mining height mining method Pending CN104088639A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410290023.0A CN104088639A (en) 2014-06-25 2014-06-25 Large-inclination angle thick coal seam strike long-wall workface large-mining height mining method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410290023.0A CN104088639A (en) 2014-06-25 2014-06-25 Large-inclination angle thick coal seam strike long-wall workface large-mining height mining method

Publications (1)

Publication Number Publication Date
CN104088639A true CN104088639A (en) 2014-10-08

Family

ID=51636384

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410290023.0A Pending CN104088639A (en) 2014-06-25 2014-06-25 Large-inclination angle thick coal seam strike long-wall workface large-mining height mining method

Country Status (1)

Country Link
CN (1) CN104088639A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104847351A (en) * 2015-05-31 2015-08-19 西安科技大学 Three-dimensional roof controlling method for fully mechanized caving of steeply inclined and extremely thick coal seam
CN104929642A (en) * 2015-06-03 2015-09-23 西安科技大学 Top coal caving quantity regional control method for variable angle fully mechanized caving face of steeply dipping seam
CN105134215A (en) * 2015-09-25 2015-12-09 西安科技大学 Local filling mining method for longwall face along strike of steeply dipping seam
CN105484783A (en) * 2015-12-04 2016-04-13 西安科技大学 Parallelogram hydraulic support suitable for large-dip-angle coal-seam long-wall false dipping working face
CN105649628A (en) * 2016-01-15 2016-06-08 西安科技大学 False-inclined inclination-angle-variable arrangement method for large-dip-angle coal seam angle-variable fully-mechanized coal mining/caving working face
CN107605531A (en) * 2017-08-01 2018-01-19 天地(常州)自动化股份有限公司 The gridding division methods of fully-mechanized mining working
CN108374660A (en) * 2018-03-26 2018-08-07 四川川煤华荣能源股份有限公司 Face in steep thick coal seam recovery method
CN108547658A (en) * 2018-03-20 2018-09-18 四川省安全科学技术研究院 A kind of high inclination-angle ultra-thin coal seam spoil is from slipping backfilling goaf method
CN110273686A (en) * 2019-08-05 2019-09-24 四川川煤华荣能源股份有限公司 High inclination-angle structure is complicated thick seam large mining high comprehensive mining process for stoping
CN111734412A (en) * 2020-06-08 2020-10-02 扎赉诺尔煤业有限责任公司 Thick coal seam layered lapping mining working face equipment model selection matching type
CN111734479A (en) * 2020-06-08 2020-10-02 扎赉诺尔煤业有限责任公司 Lapping material transportation system for lapping mining working face
CN112943248A (en) * 2021-03-17 2021-06-11 西安科技大学 Mining method for inclined layered solid deposit
CN112983422A (en) * 2021-03-17 2021-06-18 西安科技大学 Ore drawing mining method for inclined layered solid deposit
CN114412500A (en) * 2021-12-13 2022-04-29 国家能源集团宁夏煤业有限责任公司枣泉煤矿 Coal face top roof supporting device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101876253A (en) * 2009-04-29 2010-11-03 宝钢集团新疆八一钢铁有限公司 Working surface layout method for mining steeply dipping coal seam
CN102061921A (en) * 2010-12-24 2011-05-18 西安科技大学 Down-dip mining method of shaped hydraulic bracket on long-wall working surface in direction of large dip angle coal bed
CN102094660A (en) * 2010-12-24 2011-06-15 西安科技大学 Integral high-strength flexible support method of roadway at large-inclined angle coal-seam longwall mining section
CN103527197A (en) * 2013-10-28 2014-01-22 中国矿业大学 Solid cementing lane-type mining method for ultra thick seam

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101876253A (en) * 2009-04-29 2010-11-03 宝钢集团新疆八一钢铁有限公司 Working surface layout method for mining steeply dipping coal seam
CN102061921A (en) * 2010-12-24 2011-05-18 西安科技大学 Down-dip mining method of shaped hydraulic bracket on long-wall working surface in direction of large dip angle coal bed
CN102094660A (en) * 2010-12-24 2011-06-15 西安科技大学 Integral high-strength flexible support method of roadway at large-inclined angle coal-seam longwall mining section
CN103527197A (en) * 2013-10-28 2014-01-22 中国矿业大学 Solid cementing lane-type mining method for ultra thick seam

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
陈建杰等: "坚硬顶板软煤软底大倾角煤层综采技术", 《煤矿开采》, vol. 12, no. 6, 15 December 2007 (2007-12-15) *

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104847351B (en) * 2015-05-31 2017-07-25 西安科技大学 A kind of severe inclined thick coal seam longwall top coal caving controls top method with three-dimensional
CN104847351A (en) * 2015-05-31 2015-08-19 西安科技大学 Three-dimensional roof controlling method for fully mechanized caving of steeply inclined and extremely thick coal seam
CN104929642A (en) * 2015-06-03 2015-09-23 西安科技大学 Top coal caving quantity regional control method for variable angle fully mechanized caving face of steeply dipping seam
CN104929642B (en) * 2015-06-03 2017-05-10 西安科技大学 Top coal caving quantity regional control method for variable angle fully mechanized caving face of steeply dipping seam
CN105134215A (en) * 2015-09-25 2015-12-09 西安科技大学 Local filling mining method for longwall face along strike of steeply dipping seam
CN105484783A (en) * 2015-12-04 2016-04-13 西安科技大学 Parallelogram hydraulic support suitable for large-dip-angle coal-seam long-wall false dipping working face
CN105649628B (en) * 2016-01-15 2018-07-10 西安科技大学 The large-inclination-angle coal bed comprehensive coal mining caving working face puppet of varied angle, which is faced upward, tiltedly becomes inclination angle method for arranging
CN105649628A (en) * 2016-01-15 2016-06-08 西安科技大学 False-inclined inclination-angle-variable arrangement method for large-dip-angle coal seam angle-variable fully-mechanized coal mining/caving working face
CN107605531A (en) * 2017-08-01 2018-01-19 天地(常州)自动化股份有限公司 The gridding division methods of fully-mechanized mining working
CN108547658A (en) * 2018-03-20 2018-09-18 四川省安全科学技术研究院 A kind of high inclination-angle ultra-thin coal seam spoil is from slipping backfilling goaf method
CN108374660A (en) * 2018-03-26 2018-08-07 四川川煤华荣能源股份有限公司 Face in steep thick coal seam recovery method
CN110273686A (en) * 2019-08-05 2019-09-24 四川川煤华荣能源股份有限公司 High inclination-angle structure is complicated thick seam large mining high comprehensive mining process for stoping
CN111734412A (en) * 2020-06-08 2020-10-02 扎赉诺尔煤业有限责任公司 Thick coal seam layered lapping mining working face equipment model selection matching type
CN111734479A (en) * 2020-06-08 2020-10-02 扎赉诺尔煤业有限责任公司 Lapping material transportation system for lapping mining working face
CN112943248A (en) * 2021-03-17 2021-06-11 西安科技大学 Mining method for inclined layered solid deposit
CN112983422A (en) * 2021-03-17 2021-06-18 西安科技大学 Ore drawing mining method for inclined layered solid deposit
CN114412500A (en) * 2021-12-13 2022-04-29 国家能源集团宁夏煤业有限责任公司枣泉煤矿 Coal face top roof supporting device

Similar Documents

Publication Publication Date Title
CN104088639A (en) Large-inclination angle thick coal seam strike long-wall workface large-mining height mining method
CN101915101B (en) Method of mining coal from heavy pitch thick coal seam
CN102562066B (en) Method for mechanically mining coal by using steep seam pseudo inclination bracing type retractable flexible shield support
CN104929642B (en) Top coal caving quantity regional control method for variable angle fully mechanized caving face of steeply dipping seam
CN102720499B (en) Fully-mechanized top-coal caving, filling and mining method
CN109026000B (en) A kind of steep-inclined thick coal seam is bowed pseudo- tiltedly arc inclined cuting layering longwall top coal caving method
CN101725352A (en) Method for filling solid and fully mechanizing and recovering room type coal pillar
CN102587913A (en) Steeply inclined seam dip oblique strike longwall comprehensive mechanical coal mining method
CN102251774B (en) Fully mechanized coal mining method combining steeply inclined long-wall drilling type coal mining machine with hydraulic shield type supports
CN104265291A (en) Comprehensive mechanized coal mining method of steeply inclined and extremely thick coal seam planing conveyor
CN204327140U (en) A kind of gob side entry retaining gear cash device
CN101498216A (en) Thick coal seam large height workface step coal wall coal mining method
CN105134212B (en) A kind of method that three soft high seam tunnel ensures the rate of extraction along top driving longwall top coal caving
CN105134215A (en) Local filling mining method for longwall face along strike of steeply dipping seam
CN108374660A (en) Face in steep thick coal seam recovery method
CN107575228A (en) A kind of coal-mining method for reducing double lane protection pillar sizes and reducing roadway deformation amount
CN103362511B (en) High-dipping medium-thickness seam step is without pillar working
CN203962014U (en) Combine and adopt the dual-purpose working surface hydraulic support of filling
CN101858216B (en) Method for recovering stagnant coal pillars left by breast type coal mining method
CN110273686B (en) Large-mining-height fully-mechanized mining and stoping process for large-dip-angle structure complex thick coal seam
CN105370282B (en) The big high section of inclined super high seam moves towards that wall type is comprehensive to put coal-mining method
CN111828072A (en) Arched flexible shield support and system for gob-side entry retaining of coal mine
CN103397895A (en) Pseudo oblique coal face hydraulic support
CN203570351U (en) Supporting device for low coal seam comprehensive mechanized remained gateway along goaf
CN206329337U (en) The coal mining system of half-edge coal seam

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20141008