NL2027129A - A Dust Isolation-dust Reduction Device for Cutting Dust Produced by A Coal Winning Machine at A Fully Mechanized Coal Mining Face - Google Patents
A Dust Isolation-dust Reduction Device for Cutting Dust Produced by A Coal Winning Machine at A Fully Mechanized Coal Mining Face Download PDFInfo
- Publication number
- NL2027129A NL2027129A NL2027129A NL2027129A NL2027129A NL 2027129 A NL2027129 A NL 2027129A NL 2027129 A NL2027129 A NL 2027129A NL 2027129 A NL2027129 A NL 2027129A NL 2027129 A NL2027129 A NL 2027129A
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- NL
- Netherlands
- Prior art keywords
- dust
- aforementioned
- coal machine
- coal
- isolation
- Prior art date
Links
- 239000000428 dust Substances 0.000 title claims abstract description 161
- 239000003245 coal Substances 0.000 title claims abstract description 63
- 238000005065 mining Methods 0.000 title claims abstract description 27
- 230000009467 reduction Effects 0.000 title abstract description 15
- 238000005520 cutting process Methods 0.000 title abstract description 11
- 239000007921 spray Substances 0.000 claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 230000001629 suppression Effects 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 9
- 239000003595 mist Substances 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims 6
- 239000007788 liquid Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 239000002817 coal dust Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 208000019693 Lung disease Diseases 0.000 description 1
- 206010047513 Vision blurred Diseases 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/22—Equipment for preventing the formation of, or for removal of, dust
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
- E21F5/02—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires by wetting or spraying
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Separation Of Particles Using Liquids (AREA)
- Prevention Of Fouling (AREA)
Abstract
The invention discloses a dust isolation-dust reduction device for cutting dust produced by a coal winning machine at a fully mechanized coal mining face, which includes a coal winning machine. The main body of the shearer is provided with a main spray device, the rocker arm of 5 the shearer is provided with an auxiliary spray device, and a dust baffle is fixed between the body of the coal miner and the cab. The main spray device includes two dust removal fog cannons, and the dust removal fog cannons are arranged corresponding to the drum of the shearer. The auxiliary spray device includes two spray parts, the spray part includes an electric telescopic rod, the bottom end of the electric telescopic rod is fixedly connected with the rocker 10 arm of the coal shearer, and the top end of the electric telescopic rod is axially connected with a nozzle. It can effectively contain the dust generated in the coal mining process of the shearer, greatly reduce the amount of dust on the coal mining face, and improve the harsh environment of the mine. Figure 1 9
Description
A Dust Isolation-dust Reduction Device for Cutting Dust Produced by A Coal Winning Machine at A Fully Mechanized Coal Mining Face Technical Field
[001] The invention relates to the field of coal mine dust prevention and control, in particular to a dust isolation-dust reduction device for cutting dust produced by a coal winning machine at a fully mechanized coal mining face.
Background Technology
[002] Dustin coal mines causes at least the following two hazards: First, it affects the health of coal miners, and in severe cases, it can cause mine lung disease. Second, when the dust concentration reaches a saturated state, it will cause an explosion, causing mine destruction and death. In addition, dust causes serious pollution to coal mining equipment and various underground facilities, as well as blurred vision (ie reduced visibility) due to suspension of dust, which leads to incorrect operation and buried safety hazards.
[003] With the improvement of the mechanization of coal mining, the production capacity has become larger and larger, and more and more coal dust is generated, which has caused serious challenges to the working environment and safety environment of the mining face. Even the exhaust air discharged from underground along the roadway still contains a large amount of coal dust, which also causes certain pollution to the air. At present, the coal shearer adopts the "linear dust reduction device", and the linear water flow cannot cover a large amount of coal dust, which not only wastes water resources, but also causes water in the mining area. The dust reduction effect is very unsatisfactory, and the problem of coal mining dust reduction has not been really solved.
Invention Summary
[004] The purpose of the present invention is to provide a dust isolation-dust reduction device for cutting dust produced by a coal winning machine at a fully mechanized coal mining face, so as to solve the above-mentioned problems in the prior art. The dust generated in the coal mining process of the shearer is effectively contained, which greatly reduces the amount of dust on the coal mining face and improves the harsh environment of the mine.
[005] In order to achieve the above objective, the present invention provides the following solutions: the present invention provides a dust isolation-dust reduction device for cutting dust produced by a coal winning machine at a fully mechanized coal mining face, which includes a coal winning machine. The main body of the shearer is provided with a main spray device, the rocker arm of the shearer is provided with an auxiliary spray device, and a dust baffle is fixed between the body of the coal miner and the cab.
1
The main spray device includes two dust removal fog cannons, and the dust removal fog cannons are arranged corresponding to the drum of the shearer. The auxiliary spray device includes two spray parts, the spray part includes an electric telescopic rod, the bottom end of the electric telescopic rod is fixedly connected with the rocker arm of the coal shearer, and the top end of the electric telescopic rod is axially connected with a nozzle.
[006] Preferably, a trolley is fixed on both sides of the main body of the shearer, and a dust removal fan is fixed on the trolley, and the dust removal fan is connected with an air duct, the cylinder mouth of the air cylinder is arranged corresponding to the drum of the coal shearer.
[007] Preferably, a single water nozzle is arranged at the suction port of the dust removal fan, and the water mist is sprayed to the fan blades.
[008] Preferably, the dust baffle is a transparent high-strength material dust baffle.
[009] Preferably, a spray dust reduction device is fixed on the top of the dust baffle, and a dust removal brush is slidably connected to the dust baffle.
[0010] Preferably, several dust concentration sensors are fixed on the body of the shearer.
[0011] Preferably, the spray head is a wind-water nozzle.
[0012] Preferably, the spray head is provided with a plurality of spray holes in the circumferential direction.
[0013] The invention discloses the following technical effects: the invention sets dust removal fog cannons on the coal shearer body, and the muzzles are aligned with the drum of the shearer to settle a large amount of dust falling from the coal cutting of the drum. By installing an electric telescopic rod at the rocker arm of the shearer, the nozzle can be adjusted to the designated position with the telescopic rod, and spray water mist through the spray hole to form a semicircular water cover. The drum of the shearer is enclosed in a semi-circular water cover to effectively settle down the smaller dust particles. At the same time, the dust baffle can prevent the dust from spreading in a large area. The spray dust suppression device and dust removal brush at the dust baffle of transparent high-strength material can reduce the spread of dust on the working surface. By adopting measures of ventilation and dust removal, spray dust suppression, dust removal fan dust removal and dust isolation in the fully mechanized mining face, the dust generated by the shearer in the coal mining process is effectively contained, which greatly reduces the amount of dust on the coal mining face and improves the harsh environment of the mine.
2
Brief Description of Drawings
[0014] In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.
[0015] Figure 1 is a schematic diagram of the structure of a dust isolation-dust reduction device for cutting dust produced by a coal winning machine at a fully mechanized coal mining face;
[0016] Figure 2 is a schematic diagram of the structure of the spray;
[0017] Figure 3 is a schematic diagram of the structure of the nozzle;
[0018] In the diagrams: coal shearer 1, dust baffle 2, dust removal fog gun 3, spray part 4, electric telescopic rod 5, nozzle 6, pallet 7, dust removal fan 8, air duct 9, nozzle 10, dust concentration sensor 11.
Detailed Description of the Presently Preferred Embodiments
[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary technicians in the field without creative work shall fall within the protection scope of the present invention.
[0020] In order to make the above objectives, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0021] Referring to Figures 1-3, the present invention provides a dust isolation-dust reduction device for cutting dust produced by a coal winning machine at a fully mechanized coal mining face, including a coal winning machine 1. The main body of the shearer 1 is provided with a main spray device, and the rocker arm of the shearer 1 is provided with an auxiliary spray device, and a dust baffle 2 is fixed between the main body of the coal machine 1 and the cab; the main spray device includes two dust removal fog cannons 3, and the dust removal fog cannons 3 are arranged 3 corresponding to the drum of the shearer 1. The auxiliary spray device includes two spray parts 4, and the spray part 4 includes an electric telescopic rod 5, the bottom end of the electric telescopic rod 5 is fixedly connected with the rocker arm of the shearer 1, and the top end of the electric telescopic rod 5 is axially connected with a nozzle 6.
[0022] To further optimize the solution, a pallet 7 is fixed on both sides of the body of the shearer 1, and a dust removal fan 8 is fixed on the pallet 7, and the dust removal fan 8 is connected to an air duct 9 whose mouth is corresponding to the drum of the shearer
1. When the shearer is working, part of the coal dust at the drum of the shearer is drawn out by the dust removal fan 8 through the air duct 9. The pallet truck 7 is connected to the shearer 1, and remains relatively stationary with the shearer 1. A dust removal fan 8 is arranged at the front and rear of the shearer 1, respectively. The dust removal fan 8 is placed on the pallet truck, and it moves along the scraper conveyor track and the shearer 1 at the same time.
[0023] To further optimize the solution, a single water nozzle is arranged at the suction port of the dust removal fan 8, and the water mist is sprayed to the fan blades to settle the dust drawn by the dust removal fan 8.
[0024] To further optimize the solution, the dust baffle 2 is a transparent high-strength material dust baffle, so that the driver can see the coal mining situation.
[0025] To further optimize the solution, a spray dust reduction device is fixed on the top of the dust baffle 2, and a dust removal brush is slidably connected to the dust baffle 2 to effectively remove dust on the dust baffle 2 to prevent dust from blocking the working sight and improve work efficiency. The spray dust reduction device is a single water nozzle, two nozzles are arranged between each bracket, and each bracket is equipped with two dust baffles to form a continuous transparent high-strength material baffle. For the dust-removing brush, two dust-removing brushes are installed in every two brackets, which are driven by a motor. When the single water nozzle sprays water, the dust removal brush starts to work.
[0026] To further optimize the solution, a number of dust concentration sensors 11 are fixed on the body of the shearer 1 to detect the dust concentration at the work site.
[0027] To further optimize the solution, the nozzle 6 is a wind water nozzle, which minimizes the concentration of mine dust around the shearer 1.
[0028] To further optimize the solution, the spray head 6 is provided with a plurality of spray holes 10 in the circumferential direction to further expand the spray range of the spray head 6.
4
[0029] To further optimize the plan, a position transmitter is installed at the body of the shearer. When the shearer 1 moves, the position transmitter can effectively send the position information of the shearer 1 to the position installed at each support column receiver. When several frames on the upwind side and all hydraulic supports on the downwind side of the shearer 1 receive the position signal of the shearer, the single- water nozzle on the transparent high-strength dust baffle plate starts to spray water, and the dust removal brush starts to work.
[0030] A further optimization solution includes a central processing unit, which is connected to the dust concentration sensor 11, the dust removal fog cannon 3, the spray part 4, and the dust removal fan 8 in signal connection, so as to facilitate automatic control.
[0031] To further optimize the solution, the air volume of the dust removal fan 8 is adjusted. When the frequency conversion speed regulation control device of the dust removal fan 8 receives a signal, because the frequency conversion motor speed n=60*frequency/number of electrode pairs, the speed at different frequencies can be obtained by formulas. Because the air flow is proportional to the speed, that is, the air flow Q1/Q2=n1/n2, the dust removal fan can adjust the air volume by adjusting the speed.
[0032] The coal shearer 1 starts to work, the dust removal fog gun 3 is turned on, and the large amount of dust falling from the coal cutting of the coal shearer 1 is settled with water mist. The electric telescopic rod 5 of the spray part 4 expands and contracts to make the nozzle 6 reach the designated position. The hole 10 sprays water mist to form a semi-circular water hood, which covers the drum of the shearer 1 in the semi-circular water hood, and effectively settles the dust particles with a smaller particle size. The dust removal fan 8 extracts the large particles of dust falling from the coal cutting of the drum. At the same time, the dust baffle 2 can block the large-scale diffusion of dust, and the spray dust reduction device and dust removal brush at the transparent high-strength dust baffle reduce the spread of dust on the working surface. During work, the dust concentration sensor 11 detects the dust concentration in the tunnel and transmits it to the central processing unit. After receiving the corresponding information, the central processor controls the air volume of the dust removal fan 8 and the water pressure of the dust removal fog cannon 3 and the spray part 4. When the dust concentration is large, the air volume increases, and the air volume of the dust removal fan and the water pressure at the dust removal fog cannon 3 and the spray part 4 are increased to achieve the best dust removal effect under the current concentration. When the dust 5 concentration is low, reduce the air volume of the dust removal fan and the water pressure at the dust removal fog cannon 3 and spray part 4.
[0033] In the description of the present invention, it should be understood that the terms indicating the orientation or positional relationship such as “longitudinal", "lateral", "above", "below", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, as well as a specific orientation structure and operation, therefore, they cannot be understood as a limitation to the present invention.
[0034] The above-mentioned embodiments only describe the preferred mode of the present invention, but do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made by ordinary technicians in the field to the technical solution of the present invention shall fall within the protection scope determined by the claims of the present invention. 6
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2027129A NL2027129B1 (en) | 2020-12-16 | 2020-12-16 | A Dust Isolation-dust Reduction Device for Cutting Dust Produced by A Coal Winning Machine at A Fully Mechanized Coal Mining Face |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2027129A NL2027129B1 (en) | 2020-12-16 | 2020-12-16 | A Dust Isolation-dust Reduction Device for Cutting Dust Produced by A Coal Winning Machine at A Fully Mechanized Coal Mining Face |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NL2027129A true NL2027129A (en) | 2021-02-08 |
| NL2027129B1 NL2027129B1 (en) | 2021-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL2027129A NL2027129B1 (en) | 2020-12-16 | 2020-12-16 | A Dust Isolation-dust Reduction Device for Cutting Dust Produced by A Coal Winning Machine at A Fully Mechanized Coal Mining Face |
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| Country | Link |
|---|---|
| NL (1) | NL2027129B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117052391A (en) * | 2023-09-04 | 2023-11-14 | 山西高河能源有限公司 | Dust removal system for tunneling working face |
| CN117569861A (en) * | 2023-12-19 | 2024-02-20 | 亿斯德特种智能装备(大连)有限公司 | Airborne ventilation dust control device for underground coal mine mining working face and operation method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182458A (en) * | 2011-04-14 | 2011-09-14 | 淮北矿业股份有限公司 | Induced draft water curtain dust removing device for intercepted coal mining machine |
| US20120018544A1 (en) * | 2010-07-21 | 2012-01-26 | Board Of Trustees Of Southern Illinois University | Water sprays for dust control on mining machines |
| CN104722435A (en) * | 2015-02-11 | 2015-06-24 | 谭建忠 | Overhead three-dimensional telescopic spray gun mechanism |
| CN104389603B (en) * | 2014-11-27 | 2017-04-19 | 贵州盘江矿山机械有限公司 | Coal mining machine foam dust removal system and operation method thereof |
| CN108625851A (en) * | 2017-11-20 | 2018-10-09 | 付丽华 | Coal mine fully-mechanized mining, fully mechanized workface dedusting new technology |
| CN111322105A (en) * | 2020-02-27 | 2020-06-23 | 淮南市创进电子有限公司 | Mining explosion suppression dust device |
| CN111827999A (en) * | 2019-04-16 | 2020-10-27 | 辽宁工程技术大学 | Coal-winning machine that suitability is strong |
| CN112049633A (en) * | 2020-07-29 | 2020-12-08 | 义煤集团永兴工程有限责任公司 | Colliery entry driving machine that security performance is high |
-
2020
- 2020-12-16 NL NL2027129A patent/NL2027129B1/en not_active IP Right Cessation
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120018544A1 (en) * | 2010-07-21 | 2012-01-26 | Board Of Trustees Of Southern Illinois University | Water sprays for dust control on mining machines |
| CN102182458A (en) * | 2011-04-14 | 2011-09-14 | 淮北矿业股份有限公司 | Induced draft water curtain dust removing device for intercepted coal mining machine |
| CN104389603B (en) * | 2014-11-27 | 2017-04-19 | 贵州盘江矿山机械有限公司 | Coal mining machine foam dust removal system and operation method thereof |
| CN104722435A (en) * | 2015-02-11 | 2015-06-24 | 谭建忠 | Overhead three-dimensional telescopic spray gun mechanism |
| CN108625851A (en) * | 2017-11-20 | 2018-10-09 | 付丽华 | Coal mine fully-mechanized mining, fully mechanized workface dedusting new technology |
| CN111827999A (en) * | 2019-04-16 | 2020-10-27 | 辽宁工程技术大学 | Coal-winning machine that suitability is strong |
| CN111322105A (en) * | 2020-02-27 | 2020-06-23 | 淮南市创进电子有限公司 | Mining explosion suppression dust device |
| CN112049633A (en) * | 2020-07-29 | 2020-12-08 | 义煤集团永兴工程有限责任公司 | Colliery entry driving machine that security performance is high |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117052391A (en) * | 2023-09-04 | 2023-11-14 | 山西高河能源有限公司 | Dust removal system for tunneling working face |
| CN117052391B (en) * | 2023-09-04 | 2024-01-23 | 山西高河能源有限公司 | Dust removal system for tunneling working face |
| CN117569861A (en) * | 2023-12-19 | 2024-02-20 | 亿斯德特种智能装备(大连)有限公司 | Airborne ventilation dust control device for underground coal mine mining working face and operation method |
| CN117569861B (en) * | 2023-12-19 | 2024-04-12 | 亿斯德特种智能装备(大连)有限公司 | Airborne ventilation dust control device for underground coal mine mining working face and operation method |
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| Publication number | Publication date |
|---|---|
| NL2027129B1 (en) | 2021-12-01 |
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