CN114183201B - Flour dust monitoring and intelligent spraying dust fall system for fully-mechanized mining work of mine - Google Patents

Flour dust monitoring and intelligent spraying dust fall system for fully-mechanized mining work of mine Download PDF

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Publication number
CN114183201B
CN114183201B CN202111511814.8A CN202111511814A CN114183201B CN 114183201 B CN114183201 B CN 114183201B CN 202111511814 A CN202111511814 A CN 202111511814A CN 114183201 B CN114183201 B CN 114183201B
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dust
water
air supply
water supply
mine
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CN202111511814.8A
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CN114183201A (en
Inventor
聂文
许长炜
彭慧天
刘强
程卫民
华贇
鮑秋
郭立典
张少波
牛文进
张旭
刘飞
衣食行
察兴鹏
刘华君
张立栋
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Shandong University of Science and Technology
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Shandong University of Science and Technology
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00Methods or devices for use in mines or tunnels, not covered elsewhere
    • E21F17/18Special adaptations of signalling or alarm devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/082Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to a condition of the discharged jet or spray, e.g. to jet shape, spray pattern or droplet size
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/16Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02Spray pistols; Apparatus for discharge
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00Methods or devices for use in mines or tunnels, not covered elsewhere
    • E21F17/04Distributing means for power supply in mines
    • E21F17/08Distributing hydraulic power; Pipe networks for hydraulic liquid
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F5/00Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
    • E21F5/02Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires by wetting or spraying
    • E21F5/04Spraying barriers

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
  • Spray Control Apparatus (AREA)

Abstract

The invention discloses a flour dust monitoring and intelligent spraying dust fall system for fully-mechanized mining work, which comprises a dust monitoring module, intelligent spraying control equipment and a ground monitoring control system, wherein the dust monitoring module comprises a dust granularity monitoring device and a dust data analysis system, the intelligent spraying control equipment comprises a sprayer shell and water supply and air supply pipelines, steam-water atomizing nozzles and a chip control unit which are uniformly arranged in the sprayer shell, the water supply and air supply pipelines are provided with a water pressure adjusting device and an air pressure adjusting device, the sprayer shell is an oval shell, the upper surface of the shell is provided with a mounting ferrule which is sleeved on a top beam of a hydraulic support of the fully-mechanized mining work surface, the front end opening of the sprayer shell is provided with a water supply and air supply pipeline with an outward outlet end, and the end head of the water supply and air supply pipeline is connected with the steam-water atomizing nozzles which face a coal cutting dust producing area through a transfer elbow.

Description

Flour dust monitoring and intelligent spraying dust fall system for fully-mechanized mining work of mine
Technical Field
The invention relates to a mine dust fall technology, in particular to a mine fully-mechanized mining work flour dust monitoring and intelligent spraying dust fall system.
Background
The coal mining process inevitably generates a large amount of dust, the fully mechanized mining face is a main production area of a mine, the existing dust prevention method is low in dust reduction efficiency of respiratory dust, dust not only has irreversible influence on physical and psychological health of workers, but also has a certain explosion risk, and in addition, the normal service life of mechanical equipment of the mine is seriously shortened by the dust with high concentration in the pit, so that the production and operation cost of enterprises is increased. Therefore, how to efficiently treat dust generated by each working procedure of a fully-mechanized coal mining face becomes a focus of attention in the coal industry.
The existing comprehensive-mining work flour dust treatment work is mainly carried out by adopting spray dust fall, and when the traditional spray dust fall device is actually implemented, on one hand, equipment operation is more complicated, and on the other hand, spray parameters cannot be timely adjusted according to the change of the on-site dust concentration, so that a series of problems of poor actual spray dust fall effect, waste of water resources and the like are caused.
Disclosure of Invention
The invention aims to provide a mine fully-mechanized mining work flour dust monitoring and intelligent spraying dust-settling system capable of monitoring and efficiently spraying dust-settling in real time, which solves the problem that spraying parameters cannot be timely adjusted according to on-site dust concentration changes.
The technical scheme includes that the dust monitoring and intelligent spraying dust fall system comprises a dust monitoring module, intelligent spraying control equipment and a ground monitoring control system, wherein the dust monitoring module comprises a dust granularity monitoring device and a dust data analysis system, the intelligent spraying control equipment comprises a sprayer shell, and a water supply and air supply pipeline, a steam-water atomizing nozzle and a chip control unit which are uniformly arranged in the sprayer shell, the water supply and air supply pipeline is provided with a water pressure regulating device and an air pressure regulating device, the input end of the chip control unit is connected with the signal output end of the dust monitoring module, the signal output end of the chip control unit is connected with the water pressure regulating device and the air pressure regulating device, and the ground monitoring control system is connected with the dust monitoring module and the intelligent spraying control equipment through communication lines, so that the ground monitoring control system monitors the spraying dust fall condition in a mine in real time; the dust monitoring module is arranged on a vertical beam of the hydraulic support of the fully mechanized mining face and is 1.5-1.7 m away from the bottom plate of the mine tunnel; the sprayer shell is an oval shell, the upper and lower edges of the front end of the sprayer shell extend forward horizontally, the extension amount from two ends to the middle part is gradually reduced to form arc-shaped upper and lower protective eaves, the top of the sprayer shell is provided with a mounting ferrule which is sleeved on a top beam of a hydraulic support of a fully-mechanized mining face, three water supply and air supply pipelines which are arranged in a three-fork manner are arranged at the opening of the front end of the sprayer shell, the middle water supply and air supply pipelines vertically face a coal wall, the water supply and air supply pipelines at two sides respectively form a 60-degree angle with the middle water supply and air supply pipelines to realize transverse wide-angle spraying, the front end of each water supply and air supply pipeline is connected with a steam-water atomizing nozzle facing a coal cutting dust producing area through a transfer elbow, the middle transfer elbow forms a 30-degree downward angle with the horizontal, and two-side elbows form a 45-degree downward angle with the horizontal to realize the coverage of the longitudinal full coal wall of a fog field; the dust monitoring module can transmit the monitored dust concentration information to the intelligent spray control equipment, and the chip control unit can automatically adjust the water inlet pressure and the opening quantity of the steam-water atomizing nozzles through controlling the water pressure adjusting device and the air pressure adjusting device, so that the size of the mist drops of the steam-water atomizing nozzles and the spray coverage area are adjusted.
As the preference of above-mentioned scheme, steam-water atomizing nozzle is provided with water inlet and air inlet, and the water inlet is connected with the supply line of water supply air supply pipeline, and the air inlet is connected with the air supply pipeline of water supply air supply pipeline, is provided with water pressure adjusting device and one end on the supply line and is connected with mine water supply system, is provided with air pressure adjusting device and one end on the air supply pipeline and is connected with mine air supply system, and the branch is done clearly, improves spraying efficiency.
Further preferably, the rear end of the sprayer shell is in a closing-in shape, so that the water and air supply pipelines are collected at the closing-in position, the condition that the pipelines are scattered and disordered is avoided, the water and air supply pipelines are kept in a stable state, and the maintenance and the detection are convenient.
Further preferably, the long shaft is 25-35 cm, the short shaft is 15-24 cm, the tube length is 35cm, the shell of the sprayer shell is made of aluminum alloy, and the sprayer shell has the characteristics of high strength, small density, good hardness and excellent heat and electric conductivity and is commonly used for designing mine explosion-proof boxes.
Further preferably, the chip control unit of the intelligent spray control device adopts a PLC intelligent programming controller, and the operation is rapid.
The invention has the beneficial effects that:
(1) The ground monitoring control system is connected with the dust monitoring module and the intelligent spraying control equipment through communication lines, so that the ground monitoring control system monitors the spraying dust fall condition in the mine in real time, and operators can know the dust pollution condition of the mine conveniently.
(2) The atomizer casing is oval tube shell, and the upper and lower border of atomizer casing front end extends forward the level, and from both ends to the extension in middle part reduce gradually, form convex upper and lower eaves that protects, avoids damaging the condition emergence that makes the spraying effect bad because of other construction equipment collide with the catch water atomizing nozzle leads to the part.
(3) The dust monitoring module is arranged on a vertical beam of the hydraulic support of the fully-mechanized mining face, the top of the sprayer shell is provided with an installation ferrule which is sleeved on a top beam of the hydraulic support of the fully-mechanized mining face, the sprayer is positioned on the top beam, the spray dust fall of the fully-mechanized mining face can be guaranteed to be covered in an omnibearing manner from top to bottom, a spray blank area is avoided, and the dust monitoring module and the sprayer are installed by means of the hydraulic support of the fully-mechanized mining face and are ingenious and flexible in design.
(4) The dust monitoring module is 1.5-1.7 m away from the mine tunnel bottom plate, is similar to the nose breathing height of the staff, can monitor and monitor the dust concentration and granularity of the breathing zone of the staff more truly and accurately, and effectively improves the accuracy of monitoring data.
(5) Three water supply and air supply pipelines which are arranged in a three-fork shape are arranged at the opening of the front end of the sprayer shell, the middle water supply and air supply pipeline faces the coal wall vertically, the water supply and air supply pipelines on two sides are respectively at an angle of 60 degrees with the middle water supply and air supply pipeline to realize transverse wide-angle spraying, the space structure is reasonable in design, the maximum transverse spraying range of the spray nozzle is guaranteed, water resources are effectively saved, and water resource waste is avoided.
(6) The front end of each water supply and air supply pipeline is connected with a steam-water atomizing nozzle facing the coal cutting and dust producing area through a switching elbow, the middle switching elbow forms a 30-degree downward included angle with the horizontal, the elbows on two sides form a 45-degree downward included angle with the horizontal, the coverage of the longitudinal full coal wall of the fog field is realized, the space structure is reasonable in design, the maximum longitudinal spraying range of the nozzle is ensured, water resources are effectively saved, and the water resource waste is avoided.
(7) The chip control unit can automatically adjust the water inlet pressure, the water outlet pressure and the opening quantity of the steam-water atomizing nozzles by controlling the water pressure adjusting device and the air pressure adjusting device, so that the particle size distribution and the spraying quantity of mist drops of the steam-water atomizing nozzles are adjusted, the full-function is automatic, the spraying dust fall effect is effectively guaranteed, the operation is convenient and quick, and the time and the labor are saved.
In conclusion, the dust-collecting and dust-settling system has the characteristics of convenience in automatic operation, good spraying dust-settling effect, high data accuracy and comprehensive coverage of a spraying range, and is a dust-collecting and dust-collecting monitoring and intelligent spraying dust-settling system for fully-mechanized mining work of a mine.
Drawings
Fig. 1 is a schematic view of the installation of the present invention.
Fig. 2 is a schematic structural view of the present invention.
Fig. 3 is a schematic structural diagram of the intelligent spray control device.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
Referring to fig. 1-3, a mine fully-mechanized mining working flour dust monitoring and intelligent spraying dust fall system is composed of a dust monitoring module 1, intelligent spraying control equipment 2 and a ground monitoring control system 3.
The dust monitoring module 1 consists of a dust particle size monitoring device and a dust data analysis system.
The intelligent spray control device 2 consists of a sprayer shell 4, a water supply and air supply pipeline 5, a steam-water atomizing nozzle 6 and a chip control unit, wherein the water supply and air supply pipeline 5, the steam-water atomizing nozzle 6 and the chip control unit are uniformly distributed in the sprayer shell 4.
The water supply and air supply pipeline 5 is provided with a water pressure adjusting device and an air pressure adjusting device.
The input end of the chip control unit is connected with the signal output end of the dust monitoring module 1, and the signal output end of the chip control unit is connected with the water pressure regulating device and the air pressure regulating device.
The ground monitoring control system 3 is connected with the dust monitoring module 1 and the intelligent spraying control equipment 2 through communication lines, so that the ground monitoring control system 3 monitors the spraying dust fall condition in the mine in real time.
The dust monitoring module 1 is arranged on a vertical beam of the hydraulic support of the fully mechanized mining face and is 1.5-1.7 m away from the bottom plate of the mine tunnel.
The sprayer housing 4 is an oval tube shell, the long axis is 25-35 cm, the short axis is 15-24 cm, the tube length is 35cm in the inner cavity of the sprayer housing 4, and the outer shell of the sprayer housing 4 is made of aluminum alloy.
The upper and lower border of atomizer casing 4 front end extends forward the level, and from both ends to the extension of middle part grow gradually, forms convex upper and lower eaves about, and atomizer casing 4 top is equipped with the installation lasso 41 that is used for the suit on the hydraulic support back timber of fully mechanized coal face, and atomizer casing 4's rear end is the binding off form to gather water supply air supply pipeline 5 at the binding off position.
Three water and air supply pipelines 5 which are arranged in a three-fork shape are arranged at the opening of the front end of the sprayer shell 4.
The middle water supply and air supply pipeline 5 faces the coal wall vertically, and the water supply and air supply pipelines 5 on two sides respectively form a 60-degree angle with the middle water supply and air supply pipeline 5 to realize transverse wide-angle spraying.
The front end of each water supply and air supply pipeline 5 is connected with a steam-water atomizing nozzle 6 facing the coal cutting and dust producing area through a switching elbow.
The middle switching elbow forms a downward included angle of 30 degrees with the horizontal, and the two side elbows form a downward included angle of 45 degrees with the horizontal, so that the longitudinal full coal wall coverage of the fog field is realized.
The dust monitoring module 1 can transmit the monitored dust concentration information to the intelligent spray control equipment 2, and a chip control unit of the intelligent spray control equipment 2 adopts a PLC intelligent programming controller, so that a spray dust control scheme can be set by a self-defined algorithm.
The chip control unit can automatically adjust the water inlet and air inlet pressure of the steam-water atomizing nozzle 6 and the opening quantity of the steam-water atomizing nozzle 6 by controlling the water pressure adjusting device and the air pressure adjusting device, so as to adjust the granularity of mist drops of the steam-water atomizing nozzle 6 and the spray coverage area.
The steam-water atomizing nozzle 6 is provided with a water inlet and an air inlet, the water inlet is connected with a water supply pipeline of the water supply and air supply pipeline 5, the air inlet is connected with an air supply pipeline of the water supply and air supply pipeline 5, the water supply pipeline is provided with a water pressure regulating device, one end of the water supply pipeline is connected with a mine water supply system, and the air supply pipeline is provided with an air pressure regulating device, and one end of the air supply pipeline is connected with the mine air supply system.
The dust monitoring module 1 is arranged at a height of 1.5-1.7 m away from the mine tunnel bottom plate and is used for monitoring the dust concentration and granularity of the breathing zone range of monitoring operators in real time to acquire dust concentration information, and the dust monitoring module 1 can transmit the monitored dust concentration information to the intelligent spray control equipment 2.
The chip control unit can automatically adjust the water inlet pressure and the water outlet pressure of the steam-water atomizing nozzle 6 and the opening quantity of the steam-water atomizing nozzle 6 by controlling the water pressure adjusting device and the air pressure adjusting device, thereby adjusting the particle size distribution and the spraying quantity of mist drops of the steam-water atomizing nozzle 6.

Claims (4)

1. The utility model provides a mine comprehensive work flour dirt monitoring and intelligent spraying dust fall system which characterized in that: the intelligent spraying control system comprises a dust monitoring module (1), intelligent spraying control equipment (2) and a ground monitoring control system (3), wherein the dust monitoring module (1) comprises a dust granularity monitoring device and a dust data analysis system, the intelligent spraying control equipment (2) comprises a sprayer shell (4) and water supply and air supply pipelines (5) uniformly arranged in the sprayer shell (4), steam-water atomizing nozzles (6) and chip control units, the water supply and air supply pipelines (5) are provided with a water pressure adjusting device and an air pressure adjusting device, the input end of each chip control unit is connected with the signal output end of the dust monitoring module (1), the signal output end of each chip control unit is connected with the water pressure adjusting device and the air pressure adjusting device, and the ground monitoring control system (3) is connected with the dust monitoring module (1) and the intelligent spraying control equipment (2) through communication lines, so that the ground monitoring control system (3) can monitor spraying dust falling conditions in a mine in real time; the dust monitoring module (1) is arranged on a vertical beam of the hydraulic support of the fully-mechanized mining face, and is 1.5-1.7 m away from the bottom plate of the mine tunnel; the sprayer shell (4) is an oval shell, the upper edge and the lower edge of the front end of the sprayer shell (4) extend forwards horizontally, the extension amount from two ends to the middle part is gradually reduced to form arc-shaped upper and lower guard edges, the top of the sprayer shell (4) is provided with a mounting ferrule (41) which is sleeved on a top beam of a hydraulic support of a fully mechanized coal mining face, three water supply and air supply pipelines (5) which are arranged in a three-fork manner are arranged at the opening of the front end of the sprayer shell (4), the middle water supply and air supply pipelines (5) face towards a coal wall vertically, the water supply and air supply pipelines (5) on two sides are respectively connected with a steam-water atomizing nozzle (6) which faces towards a coal dust production area through a transfer elbow, the middle transfer elbow forms a downward included angle of 30 degrees with the horizontal, and the two side elbows form a downward included angle of 45 degrees with the horizontal, so that the longitudinal full coal wall of a fog field is covered; the dust monitoring module (1) can transmit the monitored dust concentration information to the intelligent spray control equipment (2), and the chip control unit can automatically adjust the water inlet and air inlet pressure of the steam-water atomizing nozzle (6) and the opening quantity of the steam-water atomizing nozzle (6) by controlling the water pressure adjusting device and the air pressure adjusting device, so as to adjust the granularity of mist drops and the spray coverage area of the steam-water atomizing nozzle (6); the rear end of the sprayer shell (4) is in a closing-in shape, so that the water supply and air supply pipelines (5) are gathered at the closing-in position.
2. The mine fully-mechanized coal mining face dust monitoring and intelligent spraying dust fall system according to claim 1, wherein: the steam-water atomizing nozzle (6) is provided with a water inlet and an air inlet, the water inlet is connected with a water supply pipeline of the water supply and air supply pipeline (5), the air inlet is connected with an air supply pipeline of the water supply and air supply pipeline (5), the water supply pipeline is provided with a water pressure regulating device, one end of the water supply pipeline is connected with a mine water supply system, and the air supply pipeline is provided with an air pressure regulating device, and one end of the air supply pipeline is connected with the mine air supply system.
3. The mine fully-mechanized coal mining face dust monitoring and intelligent spraying dust fall system according to claim 1, wherein: in the inner cavity of the sprayer shell (4), the long axis is 25-35 cm, the short axis is 15-24 cm, the tube length is 35cm, and the shell of the sprayer shell (4) is made of aluminum alloy.
4. The mine fully-mechanized coal mining face dust monitoring and intelligent spraying dust fall system according to claim 1, wherein: the chip control unit of the intelligent spray control device (2) adopts a PLC intelligent programming controller.
CN202111511814.8A 2021-12-07 2021-12-07 Flour dust monitoring and intelligent spraying dust fall system for fully-mechanized mining work of mine Active CN114183201B (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH252525A (en) * 1946-04-25 1948-01-15 Andermatt Carl Method for spraying liquids and device for carrying out the method.
DE3440901A1 (en) * 1983-12-30 1985-07-11 VEB Metalleichtbaukombinat, DDR 7030 Leipzig Arrangement for finely atomising fluids
CN103291348A (en) * 2013-06-07 2013-09-11 山西晋城无烟煤矿业集团有限责任公司 Fully mechanized coal mining face dust overrunning automatic dust suppression method
CN104390797A (en) * 2014-11-10 2015-03-04 山东科技大学 Mine working face simulation experimental device
CN106475243A (en) * 2016-11-08 2017-03-08 山东科技大学 A kind of current stabilization sprayer unit
CN206591152U (en) * 2017-03-16 2017-10-27 河南神州精工制造股份有限公司 End socket is heat-treated automatic spraying equipment
CN109530125A (en) * 2018-11-20 2019-03-29 东北农业大学 A kind of anti-drift sprayer of round wind curtain type based on Venturi effect
CN110145357A (en) * 2019-07-09 2019-08-20 山西工程技术学院 Smart spraying dust falling system and method based on mining water qualities feature and coal powder density
CN111676829A (en) * 2020-06-29 2020-09-18 中建八局浙江建设有限公司 Spraying maintenance system and method for cast-in-place box girder of viaduct bridge

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH252525A (en) * 1946-04-25 1948-01-15 Andermatt Carl Method for spraying liquids and device for carrying out the method.
DE3440901A1 (en) * 1983-12-30 1985-07-11 VEB Metalleichtbaukombinat, DDR 7030 Leipzig Arrangement for finely atomising fluids
CN103291348A (en) * 2013-06-07 2013-09-11 山西晋城无烟煤矿业集团有限责任公司 Fully mechanized coal mining face dust overrunning automatic dust suppression method
CN104390797A (en) * 2014-11-10 2015-03-04 山东科技大学 Mine working face simulation experimental device
CN106475243A (en) * 2016-11-08 2017-03-08 山东科技大学 A kind of current stabilization sprayer unit
CN206591152U (en) * 2017-03-16 2017-10-27 河南神州精工制造股份有限公司 End socket is heat-treated automatic spraying equipment
CN109530125A (en) * 2018-11-20 2019-03-29 东北农业大学 A kind of anti-drift sprayer of round wind curtain type based on Venturi effect
CN110145357A (en) * 2019-07-09 2019-08-20 山西工程技术学院 Smart spraying dust falling system and method based on mining water qualities feature and coal powder density
CN111676829A (en) * 2020-06-29 2020-09-18 中建八局浙江建设有限公司 Spraying maintenance system and method for cast-in-place box girder of viaduct bridge

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