CN104453902A - Method for switching coal face from false vertical dip mining into true inclination mining - Google Patents
Method for switching coal face from false vertical dip mining into true inclination mining Download PDFInfo
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- CN104453902A CN104453902A CN201410673107.2A CN201410673107A CN104453902A CN 104453902 A CN104453902 A CN 104453902A CN 201410673107 A CN201410673107 A CN 201410673107A CN 104453902 A CN104453902 A CN 104453902A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000003245 coal Substances 0.000 title claims abstract description 22
- 238000005065 mining Methods 0.000 title abstract description 7
- 230000007704 transition Effects 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
- 239000010959 steel Substances 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 230000032258 transport Effects 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 9
- 230000008901 benefit Effects 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 101000633503 Homo sapiens Nuclear receptor subfamily 2 group E member 1 Proteins 0.000 claims description 6
- 102100029534 Nuclear receptor subfamily 2 group E member 1 Human genes 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 4
- 208000002193 Pain Diseases 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000011435 rock Substances 0.000 abstract 2
- 238000010276 construction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 235000020004 porter Nutrition 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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Abstract
The invention discloses a method for switching a coal face from false vertical dip mining into true inclination mining. The method comprises the following steps: 1, an open-off cut initial arrangement mode is determined, to be specific, the design and arrangement are realized under a false vertical dip arrangement state according to a false inclination angle which is 25 to 30% of the true inclination length of an air way advancing belt transporter tunnel; a working face roof is supported by sections, wherein the support for the roof at the first section is designed and controlled according to the true inclination length and the support in the whole section is performed by hydraulic brackets, the support for the roof at the second section is performed by single hydraulic supporting columns in match with steel beams, and dense supporting columns are arranged on the goaf side to prevent rock from moving all round, the caved coal and rock are transported by a mode that scraper conveyers are arranged in the full length or the upper section is equipped with the scraper conveyers which are matched with the hydraulic brackets in the mounting length, and while the lower section is equipped with enameled troughs in an erection and subsection manner; 2, during the extracting stage at a transition area and a triangular transition area, a machine head is pushed more frequently than a machine tail, and the adjusting and arranging of the brackets are enhanced. With the adoption of the method, the coal face can be in transition switching from the initial false vertical dip arranging state into the true inclination state after being moved in 15 to 20m.
Description
Technical field
The present invention relates to a kind of coal-face coal-mining method switching mode, particularly a kind of coal-face pseudo discrete state model method of switching to true dip to exploit.
Background technology
When half-edge coal seam (seam inclination more than 45 °) coal-face adopts and moves towards the coal-mining method back production of longwell retrusive, if open-off cut adopts true dip to arrange, because seam inclination is large, construct very difficult, security threat is large, adopt tradition from bottom to top development blasting become lane, have that material installation upper and lower porter muscle power expends greatly, wall caving fly that cash rolls that cash is hurted sb.'s feelings, personnel easily slip and falls, supporting time erect-position location difficulty, the problem such as digging footage is low, the construction period is longer.Realize half-edge coal seam initial channel to be formed safely and fast, must start with study from the arrangement of work plane open-off cut, seeking a kind of comparatively safe efficient mode is that coal-face realizes back production as early as possible and creates favorable conditions.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned deficiency of the prior art, a kind of method that coal-face pseudo discrete state model switches to true dip to exploit is provided, it is simple to operate, safe and efficient, effectively can solve half-edge coal seam initial open-off cut construction safety and threaten large, wall caving to fly the practical problems such as cash is hurted sb.'s feelings, supporting difficulty is large.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of method that coal-face pseudo discrete state model switches to true dip to exploit, and it is characterized in that the method comprises the following steps.
Step one, initial open-off cut arrangement are determined: the initial open-off cut of coal-face adopts puppet oblique mode of bowing to arrange, i.e. work plane air way advanced machine lane certain distance, face roof supporting adopts sectional supporting mode, first paragraph all adopts hydraulic support to carry out supporting to top board, second segment adopts hydraulic prop to join girder steel supporting, and goaf side establishes close standing props to prevent from altering cash.The transport of work plane bastard coal can be adopted in two ways, and one is that drag conveyor total length is arranged, advantage is that coal-winning machine whole process has walking track, export up and down and all can cut through, without the need to manually opening side, shortcoming is the carrying out along with back production, work plane shortens gradually, and drag conveyor needs reduction in time; Another kind is step-by-step arrangement, namely epimere adopts drag conveyor, hypomere adopts and sets up enameled trough, advantage only reclaims enameled trough without the need to reducing the middle pan of scraper conveyor, working strength is slightly smaller, shortcoming is that coal-winning machine cannot cut through work plane hypomere for some time, need adopt manually to open side and blow out mode process.
Step 2, the back production of transitional region: after work plane arranges installation, enter transition recovery phase, first paragraph (adopt hydraulic support stand section) carries out coal cutting in the usual way, coalings, pushing and sliding, move frame etc., note adjusting frame, prevent from occurring between hydraulic support stinging frame, backrest, squeezing frame and downslide, second segment (hydraulic prop joins girder steel supporting section) is pushed ahead along with work plane and constantly shortens, and roof timbering region reduces gradually, until terminate.Starting stage many fly downs, push away tail less, to adjust working surface angle gradually, after advance of the face certain distance, are namely bowed by initial puppet and tiltedly arrange that furnishing true dip is arranged, enter true dip recovery phase, realize transition and switch.
The method that above-mentioned a kind of coal-face pseudo discrete state model switches to true dip to exploit, it is characterized in that: the initial open-off cut of coal-face adopts puppet to bow oblique arrangement, press the pseudo-rake angle design arrangement work plane of 25% ~ 30% of air way advanced machine lane true dip length, the initial open-off cut inclination angle of relative reduction half-edge coal seam, reduces equipment and installs degree of difficulty.
The method that above-mentioned a kind of coal-face pseudo discrete state model switches to true dip to exploit, it is characterized in that: during initial placement, top board adopts sectional supporting, first paragraph is undertaken designing and controlling by coal-face true dip length, whole employing hydraulic support carries out supporting to top board, so that the later stage enters true dip recovery phase and need not withdraw hydraulic support, second segment employing hydraulic prop is joined girder steel and is carried out supporting to top board, and goaf side establishes close standing props to prevent from altering cash.
The method that above-mentioned a kind of coal-face pseudo discrete state model switches to true dip to exploit, it is characterized in that: during initial placement, coal-face bastard coal means of transportation adopts total length to arrange or step-by-step arrangement, when total length is arranged, drag conveyor is simultaneously double does coal-winning machine walking track, the logical coal that lancinates can be realized, during step-by-step arrangement, epimere adopts and installs the supporting drag conveyor of length with hydraulic support, hypomere adopts and sets up enameled trough, need not reduce the middle pan of scraper conveyor, but hypomere manually need open side.
The method that above-mentioned a kind of coal-face pseudo discrete state model switches to true dip to exploit, it is characterized in that: coal-face transition recovery phase, many fly downs, push away tail less, add and emphasize frame, framed bent, realize exploiting transition by pseudo discrete state model to true dip after the advance of the face 15 ~ 20m and switch.
The present invention compared with prior art has the following advantages: can realize pseudo discrete state model transition and switch to true dip mining type, simple to operate, safe and efficient, reduce initial open-off cut difficulty of construction and security threat, effective solution wall caving flies the problems such as cash is hurted sb.'s feelings, supporting difficulty is large, significantly reduce accident rate, ensure that production efficiency and construction speed.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is that pseudo discrete state model of the present invention switches to true dip to exploit schematic diagram.
Number in the figure: 1 puppet is bowed oblique arrangement states; 2 one sections of roof timberings; 3 two sections of roof timberings; 4 one sections of transports; 5 two sections of transports; 6 true dip states; 7 air ways; 8 machine lanes; 9 transitional regions; 10 triangle transitional regions; 11 back production regions.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further illustrated, but therefore do not limit the present invention among described scope of embodiments.
As shown in Figure 1, a kind of method that coal-face pseudo discrete state model switches to true dip to exploit, its method comprises the following steps.
Step one, initial open-off cut arrangement are determined: the initial open-off cut of coal-face adopts puppet to bow oblique arrangement states 1, i.e. work plane air way 7 advanced machine lane 8 certain distance, face roof supporting adopts sectional supporting mode, one section of roof timbering 2 all adopts hydraulic support, two sections of roof timberings 3 adopt hydraulic prop to join girder steel, and goaf side establishes close standing props to prevent from altering cash.The transport of work plane bastard coal can be adopted in two ways, and one is that total length is arranged, advantage is that coal-winning machine whole process has walking track, export up and down and all can cut through, without the need to manually opening side, shortcoming is the carrying out along with back production, work plane shortens gradually, and drag conveyor needs reduction in time; Another kind is step-by-step arrangement, and advantage only reclaims enameled trough without the need to reducing the middle pan of scraper conveyor, and working strength is slightly smaller, and shortcoming is that coal-winning machine cannot cut through work plane hypomere for some time, need adopt manually to open side and blow out mode process.
Step 2, the back production of transitional region: after work plane arranges installation, enter transition recovery phase, transitional region 9 is carried out coal cutting in the usual way, is coaling, pushing and sliding, move frame etc., note adjusting frame, prevent from occurring between hydraulic support stinging frame, backrest, squeezing frame and downslide, triangle transitional region 10 is pushed ahead along with work plane and constantly shortens, and roof timbering region reduces gradually, until terminate.Starting stage many fly downs, push away tail less, to adjust working surface angle gradually, after advance of the face certain distance, namely to be bowed oblique arrangement states 1 furnishing true dip state 6 by initial puppet, enter true dip back production region 11, realize transition and switch.
In the present embodiment, described puppet bow oblique arrangement states 1 by air way 7 advanced machine lane 8 true dip length 30% pseudo-rake angle design arrangement work plane, relatively reduce the initial open-off cut inclination angle of half-edge coal seam, reduce equipment and degree of difficulty is installed.
In the present embodiment, described one section of transport 4 and two sections of transports 5 adopt total length to arrange, all adopt drag conveyor to carry out bastard coal transport, and when total length is arranged, drag conveyor is simultaneously double does coal-winning machine walking track, can realize the logical coal that lancinates, the reduction employing of the middle pan of scraper conveyor is special prolongs compression apparatus process.
In the present embodiment, described transitional region 9, triangle transitional region 10 recovery phase, many fly downs, push away tail less, add and emphasize frame, framed bent, realize being switched to the transition of true dip state 6 by initial puppet oblique arrangement states 1 of bowing after advance of the face 15m.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every above embodiment is done according to the technology of the present invention essence any simple modification, change and equivalent structure change, all belong in the protection domain of technical solution of the present invention.
Claims (5)
1. the coal-face pseudo discrete state model method that switches to true dip to exploit, is characterized in that the method comprises the following steps:
Step one, initial open-off cut arrangement are determined: the initial open-off cut of coal-face adopts puppet to bow oblique arrangement states (1), i.e. advanced machine lane (8) certain distance of work plane air way (7), face roof supporting adopts sectional supporting mode, one section of roof timbering (2) all adopts hydraulic support, two sections of roof timberings (3) adopt hydraulic prop to join girder steel, and goaf side establishes close standing props to prevent from altering cash; The transport of work plane bastard coal can be adopted in two ways, and one is that total length is arranged, advantage is that coal-winning machine whole process has walking track, export up and down and all can cut through, without the need to manually opening side, shortcoming is the carrying out along with back production, work plane shortens gradually, and drag conveyor needs reduction in time; Another kind is step-by-step arrangement, and advantage only reclaims enameled trough without the need to reducing the middle pan of scraper conveyor, and working strength is slightly smaller, and shortcoming is that coal-winning machine cannot cut through work plane hypomere for some time, need adopt manually to open side and blow out mode process; Step 2, the back production of transitional region: after work plane arranges installation, enter transition recovery phase, transitional region (9) is carried out coal cutting in the usual way, is coaling, pushing and sliding, move frame etc., note adjusting frame, prevent from occurring between hydraulic support stinging frame, backrest, squeezing frame and downslide, triangle transitional region (10) is pushed ahead along with work plane and constantly shortens, and roof timbering region reduces gradually, until terminate; Starting stage many fly downs, push away tail less, to adjust working surface angle gradually, after advance of the face certain distance, namely to be bowed oblique arrangement states (1) furnishing true dip state (6) by initial puppet, enter true dip back production region (11), realize transition and switch.
2. a kind of coal-face pseudo discrete state model according to claim 1 method of switching to true dip to exploit, it is characterized in that the initial open-off cut of coal-face adopts puppet to bow oblique arrangement states (1), press the pseudo-rake angle design arrangement work plane of 25% ~ 30% of advanced machine lane (8) the true dip length of air way (7), the initial open-off cut inclination angle of relative reduction half-edge coal seam, reduces equipment and installs degree of difficulty.
3. a kind of coal-face pseudo discrete state model according to claim 1 method of switching to true dip to exploit, it is characterized in that initial puppet bow oblique arrangement states (1) time top board adopt sectional supporting, one section of roof timbering (2) is undertaken designing and controlling by coal-face true dip length, whole employing hydraulic support, so that the later stage enters true dip recovery phase and need not withdraw hydraulic support, two sections of roof timberings (3) adopt hydraulic prop to join girder steel, and goaf side establishes close standing props to prevent from altering cash.
4. a kind of coal-face pseudo discrete state model according to claim 1 method of switching to true dip to exploit, it is characterized in that initial puppet bow oblique arrangement states (1) time coal-face bastard coal means of transportation one section of transport (4) and two sections of transports (5) adopt total lengths to arrange or step-by-step arrangement, when total length is arranged, drag conveyor is simultaneously double does coal-winning machine walking track, the logical coal that lancinates can be realized, during step-by-step arrangement, one section of transport (4) adopts and installs the supporting drag conveyor of length with hydraulic support, two sections of transport (5) employings set up enameled trough, the middle pan of scraper conveyor need not be reduced, but hypomere manually need open side.
5. a kind of coal-face pseudo discrete state model according to claim 1 method of switching to true dip to exploit, it is characterized in that transitional region (9), triangle transitional region (10) recovery phase, many fly downs, push away tail less, add and emphasize frame, framed bent, realize after the advance of the face 15 ~ 20m being switched to the transition of true dip state (6) by initial puppet oblique arrangement states (1) of bowing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410673107.2A CN104453902A (en) | 2014-11-23 | 2014-11-23 | Method for switching coal face from false vertical dip mining into true inclination mining |
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| CN201410673107.2A CN104453902A (en) | 2014-11-23 | 2014-11-23 | Method for switching coal face from false vertical dip mining into true inclination mining |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN106523010A (en) * | 2015-09-15 | 2017-03-22 | 四川达竹煤电(集团)有限责任公司金刚煤矿 | Steeply-inclined coal seam working face and coal mining 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 |
| CN110130894A (en) * | 2019-05-21 | 2019-08-16 | 山东东山新驿煤矿有限公司 | A kind of abnormity working face equipment installation method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2461713C1 (en) * | 2011-02-21 | 2012-09-20 | Учреждение Российской академии наук Институт угля Сибирского отделения РАН (ИУ СО РАН) | Development method of thick steeply inclined coal formation in strips as to inclination |
| CN103256048A (en) * | 2013-05-30 | 2013-08-21 | 天地科技股份有限公司 | Mining method of coal drilling unit for comprehensive mechanized coal mining |
| CN103321642A (en) * | 2013-05-06 | 2013-09-25 | 中国矿业大学 | Gob-side entry retaining surrounding rock stabilizing method based on lateral rock stratum pre-splitting control |
-
2014
- 2014-11-23 CN CN201410673107.2A patent/CN104453902A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2461713C1 (en) * | 2011-02-21 | 2012-09-20 | Учреждение Российской академии наук Институт угля Сибирского отделения РАН (ИУ СО РАН) | Development method of thick steeply inclined coal formation in strips as to inclination |
| CN103321642A (en) * | 2013-05-06 | 2013-09-25 | 中国矿业大学 | Gob-side entry retaining surrounding rock stabilizing method based on lateral rock stratum pre-splitting control |
| CN103256048A (en) * | 2013-05-30 | 2013-08-21 | 天地科技股份有限公司 | Mining method of coal drilling unit for comprehensive mechanized coal mining |
Non-Patent Citations (1)
| Title |
|---|
| 刘勇等: "急倾斜煤层采煤方法优化探讨", 《煤炭工程》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106523010A (en) * | 2015-09-15 | 2017-03-22 | 四川达竹煤电(集团)有限责任公司金刚煤矿 | Steeply-inclined coal seam working face and coal mining method |
| CN106523010B (en) * | 2015-09-15 | 2019-01-18 | 四川达竹煤电(集团)有限责任公司金刚煤矿 | Half-edge coal seam coal working face and coal-mining method |
| 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 |
| 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 |
| 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 |
| CN110130894A (en) * | 2019-05-21 | 2019-08-16 | 山东东山新驿煤矿有限公司 | A kind of abnormity working face equipment installation method |
| CN110130894B (en) * | 2019-05-21 | 2020-12-11 | 山东东山新驿煤矿有限公司 | Method for installing special-shaped working face equipment |
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Application publication date: 20150325 |