CN114017697A - Explosion-proof engineering illuminating lamp with gas purification function for underground engineering - Google Patents

Explosion-proof engineering illuminating lamp with gas purification function for underground engineering Download PDF

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Publication number
CN114017697A
CN114017697A CN202111383746.1A CN202111383746A CN114017697A CN 114017697 A CN114017697 A CN 114017697A CN 202111383746 A CN202111383746 A CN 202111383746A CN 114017697 A CN114017697 A CN 114017697A
Authority
CN
China
Prior art keywords
wall
explosion
illuminating lamp
proof
plate
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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
CN202111383746.1A
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Chinese (zh)
Inventor
张红
吴国明
张卫国
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.)
Jiangsu Hongjie Intelligent Technology Co ltd
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Jiangsu Hongjie Intelligent Technology Co ltd
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.)
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Priority to CN202111383746.1A priority Critical patent/CN114017697A/en
Publication of CN114017697A publication Critical patent/CN114017697A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21L—LIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION
    • F21L2/00—Systems of electric lighting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/38—Removing components of undefined structure
    • B01D53/40—Acidic components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/10—Pendants, arms, or standards; Fixing lighting devices to pendants, arms, or standards
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/14—Adjustable mountings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/14—Adjustable mountings
    • F21V21/15—Adjustable mountings specially adapted for power operation, e.g. by remote control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/36—Hoisting or lowering devices, e.g. for maintenance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Gas Separation By Absorption (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses an explosion-proof engineering illuminating lamp with a gas purification function for underground engineering, which comprises a bottom plate, a limiting plate and a lifting mechanism, wherein four corners of the outer wall of the bottom part of the bottom plate are respectively provided with a universal wheel, one end of the outer wall of the top part of the bottom plate is welded with a connecting plate, one end of the outer wall of the top part of the connecting plate is hinged with a folding plate, the outer wall of one side of the folding plate is provided with a sliding groove, the inner wall of the sliding groove is provided with the lifting mechanism, the outer wall of one side of the lifting mechanism is welded with an L-shaped plate, and the outer wall of one side of the L-shaped plate is provided with the explosion-proof illuminating lamp. The foldable design of the folding plate can fold the explosion-proof illuminating lamp down and retract when the illuminating lamp is not needed, the overall height of the device is reduced, the device is convenient to move and transfer, the acid gas in the air can be contacted with the alkaline solution to achieve the purpose of acid removal, the gas after the acid removal can be blown into the alkaline solution again and contacted with the alkaline solution for many times, and the acid gas removal effect is greatly improved.

Description

Explosion-proof engineering illuminating lamp with gas purification function for underground engineering
Technical Field
The invention relates to the technical field of lifting, in particular to an explosion-proof engineering illuminating lamp with a gas purification function for underground engineering.
Background
The underground engineering includes underground house, underground structure, underground railway, highway tunnel, underwater tunnel, underground common ditch, etc. the underground construction has poor lighting condition and low visibility, and during the construction of underground engineering, the fuel oil burns insufficiently due to oxygen deficiency to result in high acid gas content in the tail gas and thus to result in high acid gas content in the air.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an explosion-proof engineering illuminating lamp with a gas purification function for underground engineering.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an underground works is with explosion-proof type engineering lighting lamp that has gaseous purification performance, bottom plate, limiting plate and elevating system that the universal wheel was all installed including bottom outer wall four corners, bottom plate top outer wall one end welding has the connecting plate, and connecting plate top outer wall one end articulates there is the folded sheet, the outer wall of folded sheet one side is opened there is the spout, and the spout inner wall installs elevating system, the outer wall welding of elevating system one side has the L template, and L template one side outer wall installs explosion-proof lighting lamp, bottom plate top outer wall is fixed with the purifying box, and the outer wall of purifying box top is pegged graft and is had main tuber pipe, the welding of main tuber pipe one end has the air inlet fill, and the air inlet fill inner wall installs first decompression, purifying box top inner wall is linked together through connecting pipe and main tuber pipe inner wall, and purifying box one side inner wall installs the electric fan valve.
Preferably, the lifting mechanism comprises a servo motor, an output shaft of the servo motor is connected with a screw rod through a coupler, and a sliding block is connected to the screw rod in a threaded mode.
Preferably, the second fan is installed on the inner wall of the main air duct, and a wind screen is welded on the inner wall of the main air duct.
Preferably, the connecting plate and the outer wall of the opposite side of the folding plate are both provided with slots, and alkaline solution is arranged in the purifying box.
Preferably, the flashboards are welded at the two ends of the outer wall of one side of the limiting plate and are matched with the slots.
Preferably, the welding of purifying box top inner wall one end has the feed liquor pipe, and the welding of purifying box one side inner wall bottom has the drain pipe.
Preferably, the explosion-proof illuminating lamp, the first electric fan, the servo motor and the second fan are all connected with a switch through wires, and the switch is connected with an external power supply through a power line.
The invention has the beneficial effects that:
1. the explosion-proof illuminating lamp can illuminate underground construction, the folding plate is designed in a folding type mode, when illumination is not needed, the folded explosion-proof illuminating lamp can be put down and folded, the overall height of the device is reduced, the device is convenient to move and transfer, meanwhile, the folding plate can be erected when illumination is needed, the initial position height of the explosion-proof illuminating lamp is increased, the subsequent height of the explosion-proof illuminating lamp can be increased, the illumination range is larger, after the folding plate is erected, the screw rod can be driven to rotate through the servo motor, the position height of the explosion-proof illuminating lamp is further increased, and the illumination range is improved;
2. alkaline solution in the accessible purifying box removes acid purification to the air of underground building site, blow in alkaline solution through first electric fan and second fan with the air of underground building site, carry out the acid gas in the feasible air and the contact of alkaline solution reach the purpose of removing acid, gas after removing acid, can fly into in the main air duct through the connecting pipe once more, in being blown in alkaline solution once more, form the circulation, contact with alkaline solution many times, great improvement the effect of getting rid of acid gas, can avoid blowing in the interior air current of main air duct from the outside through the connecting pipe directly get into in the purifying box and do not fully contact with alkaline solution through the deep bead that sets up, when accumulational gas is too much in the purifying box, can be automatic through the external discharge of relief valve.
Drawings
FIG. 1 is a front sectional view of an explosion-proof type engineering illumination lamp with a gas purification function for underground engineering according to the present invention;
FIG. 2 is a structural diagram of a limiting plate of an explosion-proof type engineering illuminating lamp with a gas purification function for underground engineering according to the present invention;
FIG. 3 is a front view of an explosion-proof type engineering illumination lamp with a gas purification function for underground engineering according to the present invention;
fig. 4 is a schematic installation diagram of an explosion-proof engineering illuminating lamp with a gas purification function for underground engineering according to the present invention.
In the figure: 1. a base plate; 2. a connecting plate; 3. folding the board; 4. a chute; 5. an L-shaped plate; 6. an explosion-proof illuminating lamp; 7. a purification box; 8. a main air duct; 9. an air inlet hopper; 10. a first electric fan; 11. a connecting pipe; 12. a pressure reducing valve; 13. a servo motor; 14. a screw rod; 15. a slider; 16. a second fan; 17. a wind deflector; 18. a slot; 19. a limiting plate; 20. inserting plates; 21. a liquid inlet pipe; 22. a liquid outlet pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1:
referring to fig. 1-4, an explosion-proof engineering illuminating lamp with a gas purification function for underground engineering comprises a bottom plate 1, a limiting plate 19 and a lifting mechanism, wherein four corners of the outer wall of the bottom part of the bottom plate are respectively provided with a universal wheel, the lifting mechanism comprises a servo motor 13, and a screw rod 14 can be driven by the servo motor 13 to rotate, so that the position height of the explosion-proof illuminating lamp 6 is further increased, and the illumination range is enlarged;
an output shaft of the servo motor 13 is connected with a screw rod 14 through a coupler, the screw rod 14 is in threaded connection with a sliding block 15, one end of the outer wall of the top of the bottom plate 1 is welded with a connecting plate 2, one end of the outer wall of the top of the connecting plate 2 is hinged with a folding plate 3, the folding plate 3 is of a foldable design, when illumination is not needed, the explosion-proof illuminating lamp 6 can be put down and folded after being folded, the overall height of the device is reduced, movement and transfer are facilitated, meanwhile, the folding plate 3 can be erected when illumination is needed, the initial position height of the explosion-proof illuminating lamp 6 is increased, the explosion-proof illuminating lamp 6 can be lifted subsequently, and the illumination range is larger;
3 one side outer walls of folded sheet are opened there is spout 4, and 4 inner walls of spout install elevating system, the outer wall welding of elevating system one side has L template 5, and explosion-proof light 6 is installed to L template 5 one side outer wall, explosion-proof light 6, first electric fan 10, servo motor 13 and second fan 16 all are connected with the switch through the wire, and the switch is connected with external power source through the power cord, 1 top outer wall of bottom plate is fixed with purifying box 7, and 7 top outer walls of purifying box are pegged graft and are had main tuber pipe 8, 8 one end welding of main tuber pipe have the air inlet fill 9, and the air inlet fill 9 inner wall installs first electric fan 10, 7 top inner walls of purifying box are linked together through connecting pipe 11 and 8 inner walls of main tuber pipe, and 7 one side inner walls of purifying box install pressure reduction valve 12.
Example 2:
referring to fig. 1-4, an explosion-proof engineering illuminating lamp with a gas purification function for underground engineering comprises a bottom plate 1, a limiting plate 19 and a lifting mechanism, wherein four corners of the outer wall of the bottom part of the bottom plate are all provided with universal wheels, two ends of the outer wall of one side of the limiting plate 19 are both welded with inserting plates 20, the inserting plates 20 are matched with inserting grooves 18, one end of the outer wall of the top part of the bottom plate 1 is welded with a connecting plate 2, the outer walls of the opposite sides of the connecting plate 2 and the folding plate 3 are both provided with the inserting grooves 18, an alkaline solution is arranged in a purification box 7, the air of an underground construction site is subjected to deacidification purification by the alkaline solution in the purification box 7, the air of the underground construction site is blown into the alkaline solution by a first fan 10 and a second fan 16, and acidic gas in the air is contacted with the alkaline solution to achieve the purpose of deacidification;
one end of the outer wall of the top of the connecting plate 2 is hinged with a folding plate 3, the outer wall of one side of the folding plate 3 is provided with a chute 4, the inner wall of the chute 4 is provided with a lifting mechanism, the outer wall of one side of the lifting mechanism is welded with an L-shaped plate 5, the outer wall of one side of the L-shaped plate 5 is provided with an explosion-proof illuminating lamp 6, the outer wall of the top of the bottom plate 1 is fixed with a purifying box 7, gas after deacidification can float into the main air pipe 8 through a connecting pipe 11 again and is blown into alkaline solution again to form circulation, the gas is contacted with the alkaline solution for many times, the removal effect of acidic gas is greatly improved, and the arranged wind shield 17 can prevent the gas blown into the main air pipe 8 from the outside from directly entering the purifying box 7 through the connecting pipe 11 and not being fully contacted with the alkaline solution;
7 top inner wall one end welding of purifying box has feed liquor pipe 21, and 7 one side inner wall bottom welding of purifying box has drain pipe 22, and 7 top outer walls of purifying box are pegged graft and are had main tuber pipe 8, second fan 16 is installed to main tuber pipe 8 inner wall, and 8 inner wall welding of main tuber pipe have deep bead 17, 8 one end welding of main tuber pipe have the air inlet fill 9, and the air inlet fill 9 inner wall installs first electric fan 10, 7 top inner walls of purifying box are linked together through connecting pipe 11 and 8 inner walls of main tuber pipe, and 7 one side inner walls of purifying box install pressure reduction valve 12.
The device is pushed to the position required by an underground construction site, the folding plate 3 is erected, the two inserting plates 20 are respectively inserted into the two inserting grooves 18, the erected folding plate 3 is limited, the explosion-proof illuminating lamp 6 is used for illuminating the underground construction site, the screw rod 14 can be driven by the servo motor 13 to rotate forwards or reversely, the sliding block 15 can move up and down in the sliding groove 4, the height of the explosion-proof illuminating lamp 6 is adjusted again, air on the construction site is blown into the main air pipe 8 through the first electric fan 10, air flow is blown into alkaline solution in the purifying box 7 through the second electric fan 16 to be contacted with the alkaline solution, neutralization reaction is carried out, acid gas in the air is removed, after the air flow forms bubbles and breaks and is contacted with the alkaline solution, the air flow can flow into the main air pipe 8 through the connecting pipe 11 again, the air flow is blown into the alkaline solution again, circulation is formed, contact with alkaline solution many times, great improvement acid gas's the effect of getting rid of, can avoid blowing in the air current in the main air hose 8 from the outside through the deep bead 17 that sets up and do not fully contact with alkaline solution in directly getting into the purifying box 7 through connecting pipe 11, when accumulational gas is too much in the purifying box 7, can be automatic through decompression valve 12 to the external discharge.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (7)

1. An explosion-proof engineering illuminating lamp with a gas purification function for underground engineering comprises a bottom plate (1) with universal wheels mounted at four corners of the outer wall of the bottom, a limiting plate (19) and a lifting mechanism, and is characterized in that a connecting plate (2) is welded at one end of the outer wall of the top of the bottom plate (1), a folding plate (3) is hinged at one end of the outer wall of the top of the connecting plate (2), a chute (4) is formed in the outer wall of one side of the folding plate (3), the lifting mechanism is mounted on the inner wall of the chute (4), an L-shaped plate (5) is welded at the outer wall of one side of the lifting mechanism, an explosion-proof illuminating lamp (6) is mounted on the outer wall of one side of the L-shaped plate (5), a purification box (7) is fixed on the outer wall of the top of the bottom plate (1), a main air pipe (8) is inserted into the outer wall of the top of the purification box (7), an air inlet hopper (9) is welded at one end of the main air pipe (8), and a first electric fan (10) is mounted on the inner wall of the air inlet hopper (9), the inner wall of the top of the purification box (7) is communicated with the inner wall of the main air pipe (8) through a connecting pipe (11), and a pressure reducing valve (12) is installed on the inner wall of one side of the purification box (7).
2. An explosion-proof engineering illuminating lamp with a gas purification function for underground engineering according to claim 1, characterized in that the lifting mechanism comprises a servo motor (13), an output shaft of the servo motor (13) is connected with a screw rod (14) through a coupler, and a slide block (15) is screwed on the screw rod (14).
3. An explosion-proof engineering illuminating lamp with a gas purification function for underground engineering according to claim 1, characterized in that the inner wall of the main air duct (8) is provided with a second fan (16), and the inner wall of the main air duct (8) is welded with a wind screen (17).
4. An explosion-proof engineering illuminating lamp with gas purification function for underground engineering according to claim 1, characterized in that the connecting plate (2) and the outer wall of the folding plate (3) at the opposite side are both provided with slots (18), and the purifying box (7) is provided with alkaline solution.
5. An explosion-proof engineering illuminating lamp with a gas purification function for underground engineering according to claim 1, characterized in that both ends of the outer wall of one side of the limiting plate (19) are welded with inserting plates (20), and the inserting plates (20) are matched with the inserting grooves (18).
6. The explosion-proof engineering illuminating lamp with the gas purification function for the underground engineering as claimed in claim 1, wherein a liquid inlet pipe (21) is welded at one end of the inner wall of the top of the purification box (7), and a liquid outlet pipe (22) is welded at the bottom of the inner wall of one side of the purification box (7).
7. An explosion-proof engineering illuminating lamp with a gas purification function for underground engineering according to claim 1, characterized in that the explosion-proof illuminating lamp (6), the first electric fan (10), the servo motor (13) and the second fan (16) are all connected with a switch through wires, and the switch is connected with an external power supply through a power line.
CN202111383746.1A 2021-11-22 2021-11-22 Explosion-proof engineering illuminating lamp with gas purification function for underground engineering Pending CN114017697A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111383746.1A CN114017697A (en) 2021-11-22 2021-11-22 Explosion-proof engineering illuminating lamp with gas purification function for underground engineering

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111383746.1A CN114017697A (en) 2021-11-22 2021-11-22 Explosion-proof engineering illuminating lamp with gas purification function for underground engineering

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CN114017697A true CN114017697A (en) 2022-02-08

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203777927U (en) * 2014-04-22 2014-08-20 甘肃省交通科学研究院有限公司 Air dust and acidic gas purification device in underground work construction period
CN106693578A (en) * 2016-12-26 2017-05-24 青岛林川工程技术咨询有限公司 Air purification device applicable to long and narrow underground space at construction period
CN206247243U (en) * 2016-12-14 2017-06-13 沈阳建筑大学 A kind of purification of air power generation road lamp
CN108087754A (en) * 2017-12-25 2018-05-29 丁浩原 A kind of student is with environment-friendly type eyeshield LED light
CN108662479A (en) * 2018-05-10 2018-10-16 安徽工程大学 A kind of special omnidirectional formula arm lamp of ob-gyn
CN108826067A (en) * 2018-05-10 2018-11-16 安徽工程大学 A kind of adjustable medical multi-angular searchlighting arm lamp of light
CN109519824A (en) * 2018-12-11 2019-03-26 洪睿涵 A kind of street lamp easy to repair
CN211874534U (en) * 2020-03-30 2020-11-06 陇东学院 Underground coal mine ventilation and dust removal device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203777927U (en) * 2014-04-22 2014-08-20 甘肃省交通科学研究院有限公司 Air dust and acidic gas purification device in underground work construction period
CN206247243U (en) * 2016-12-14 2017-06-13 沈阳建筑大学 A kind of purification of air power generation road lamp
CN106693578A (en) * 2016-12-26 2017-05-24 青岛林川工程技术咨询有限公司 Air purification device applicable to long and narrow underground space at construction period
CN108087754A (en) * 2017-12-25 2018-05-29 丁浩原 A kind of student is with environment-friendly type eyeshield LED light
CN108662479A (en) * 2018-05-10 2018-10-16 安徽工程大学 A kind of special omnidirectional formula arm lamp of ob-gyn
CN108826067A (en) * 2018-05-10 2018-11-16 安徽工程大学 A kind of adjustable medical multi-angular searchlighting arm lamp of light
CN109519824A (en) * 2018-12-11 2019-03-26 洪睿涵 A kind of street lamp easy to repair
CN211874534U (en) * 2020-03-30 2020-11-06 陇东学院 Underground coal mine ventilation and dust removal device

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