CN114471061A - Dust removal device and method for coal mining - Google Patents
Dust removal device and method for coal mining Download PDFInfo
- Publication number
- CN114471061A CN114471061A CN202210239907.8A CN202210239907A CN114471061A CN 114471061 A CN114471061 A CN 114471061A CN 202210239907 A CN202210239907 A CN 202210239907A CN 114471061 A CN114471061 A CN 114471061A
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- Prior art keywords
- dust
- ash
- coal mining
- fixed
- filter
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- 239000000428 dust Substances 0.000 title claims abstract description 75
- 239000003245 coal Substances 0.000 title claims abstract description 23
- 238000005065 mining Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 230000000670 limiting effect Effects 0.000 claims description 27
- 238000001914 filtration Methods 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 6
- 238000007667 floating Methods 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 3
- 230000006378 damage Effects 0.000 abstract description 6
- 208000027418 Wounds and injury Diseases 0.000 abstract description 4
- 208000014674 injury Diseases 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 206010035653 pneumoconiosis Diseases 0.000 abstract description 3
- 238000004880 explosion Methods 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- E21F5/04—Spraying 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)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The utility model provides a dust collector and method are adopted in coal mining, the coal mining field can solve the problem that above-mentioned background art provided, can produce a large amount of dust dusts during coal mining, and the dust can lead to the human body to receive the injury, for example pneumoconiosis etc. can lead to the fact permanent injury to human health, and the dust can also reduce sight visibility simultaneously, can increase the dangerous easy collision that takes place of construction, and the dust too much then produces dust explosion easily, leads to the problem that the mine opening collapses. The method comprises the following steps: the method comprises the following steps: the electric telescopic rod is electrified, so that the angle of the air suction pump can be adjusted; step two: the filter plate is pulled to move, the vibrating device is electrified, and ash can be removed; step three: the motor is electrified to drive the screw rod to rotate, the screw rod rotates to drive the nut to move, the nut moves to drive the filter bag to move, and dust can be removed.
Description
Technical Field
The invention belongs to the field of coal mining, and particularly relates to a dust removal device and method for coal mining.
Background
Can produce a large amount of dust dusts during coal mining, the dust can lead to the human body to receive the injury, for example pneumoconiosis etc. can lead to the permanent injury to the health of people, and the dust still can reduce sight visibility simultaneously, can increase the dangerous easy collision that takes place of construction, and the dust is too much then produces the dust explosion easily, leads to the mine opening to collapse.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a dust removal device and method for coal mining.
The invention adopts the following technical scheme:
the utility model provides a dust collector for coal mining which characterized in that: the method comprises the following steps: the ash collecting device, the ash sucking device, the filtering device and the water filtering device are connected, the ash sucking device is fixedly communicated with the side wall of the ash collecting device, the ash sucking device is arranged in a plurality of modes, the filtering device is fixed inside the ash collecting device, the water filtering device is fixed at the upper end of the ash collecting device, and the water filtering device is communicated with the ash collecting device.
A method of a dust extraction apparatus for coal mining, the method comprising the steps of:
the method comprises the following steps: the electric telescopic rod is electrified, so that the angle of the air suction pump can be adjusted;
step two: the filter plate is pulled to move, the vibrating device is electrified, and ash can be removed;
step three: the motor is electrified to drive the screw rod to rotate, the screw rod rotates to drive the nut to move, the nut moves to drive the filter bag to move, and dust can be removed.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a dust removal device for coal mining, which can solve the problems of the background technology, a large amount of dust and dust can be generated during coal mining, the dust can cause harm to human bodies, such as pneumoconiosis and the like, can cause permanent harm to human health, meanwhile, the dust can reduce the visibility of sight, can increase the risk of construction, is easy to collide, and the dust is easy to explode when the dust is too much, so that the mine cave collapses.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the ash suction device;
FIG. 3 is a front view of the ash suction box;
FIG. 4 is a schematic view of the water filtration apparatus.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying 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 invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
A dust removing device for coal mining, comprising: ash collecting device 1, inhale grey device 2, filter equipment 3 and water and worry device 4, inhale the fixed intercommunication of lateral wall of grey device 2 and ash collecting device 1, it sets up to a plurality ofly to inhale grey device 2, 1 inside filter equipment 3 that is fixed with of ash collecting device, 1 upper end of ash collecting device is fixed with water and worrys device 4, device 4 and ash collecting device 1 intercommunication are considered to water.
The dust collecting device 1 includes: the device comprises a collecting barrel 1-1, an ash outlet 1-2, a cover plate 1-3, an air outlet 1-4, a shaft support 1-5, an electric telescopic rod 1-6 and a hinge column 1-7, wherein the ash outlet 1-2 is formed in the bottom of the collecting barrel 1-1, the cover plate 1-3 is arranged on the top of the collecting barrel 1-1 in a sealing mode, the air outlet 1-4 is formed in the cover plate 1-3, the shaft support 1-5 is horizontally fixed in the collecting barrel 1-1, the fixed end of the electric telescopic rod 1-6 is fixedly connected with the collecting barrel 1-1, the hinge column 1-7 is horizontally fixed on the outer side face of the collecting barrel 1-1, and the number of the electric telescopic rods 1-6 is multiple.
A plurality of the dust suction devices 2 each include: the dust suction box comprises an ash suction box 2-1, an air suction pump 2-2, a chute 2-3, a collection cover 2-4, a filtering device 2-5 and a corrugated pipe 2-6, wherein one end of the ash suction box 2-1 is fixedly communicated with the air suction pump 2-2, the chute 2-3 is arranged at the lower end of the ash suction box 2-1, the movable end of an electric telescopic rod 1-6 is connected with the chute 2-3 in a sliding manner, one end of the chute 2-3 is rotatably connected with a hinged column 1-7, the collection cover 2-4 is arranged at the upper end of the ash suction box 2-1, the filtering device 2-5 is inserted into the ash suction box 2-1 in a sliding and sealing manner, a plurality of filtering devices 2-5 are arranged, the filtering device 2-5 is arranged in the collection cover 2-4, the corrugated pipe 2-6 is arranged at the other end of the ash suction box 2-1, the corrugated pipe 2-6 is fixedly communicated with the dust absorption box 2-1. Bellows 2-6 are malleable for angular adjustment.
A plurality of said filtering means 2-5 comprises: a limiting guide wheel 2-5-1, a filter plate 2-5-2, a limiting plate 2-5-3 and a vibrating device 2-5-4, wherein the upper end of the dust suction box 2-1 is rotatably connected with the limiting guide wheel 2-5-1, the limiting guide wheels 2-5-1 are arranged in two, the limiting guide wheels 2-5-1 are symmetrically arranged, the filter plate 2-5-2 is inserted into the dust suction box 2-1 in a sliding and sealing manner, the size of the filter plate 2-5-2 is matched with that of the dust suction box 2-1, the filter plate 2-5-2 is arranged between the two guide wheels 2-5-1, the guide wheels 2-5-1 are abutted against the filter plate 2-5-2, the upper end and the lower end of the filter plate 2-5-2 are respectively provided with the limiting plate 2-5-3, the limiting plate 2-5-3 prevents the filter plate 2-5-2 from falling off in the drawing process, the vibrating device 2-5-4 is fixed on the limiting plate 2-5-3 at the upper end, and the limiting guide wheel 2-5-1 can play a role of fixing and limiting the filter plate 2-5-2 and prevent the filter plate 2-5-2 from toppling over.
The filter device 3 includes: the filter bag comprises a filter bag 3-1, a nut 3-2, a motor 3-3, a screw rod 3-4 and a spring 3-5, wherein the upper end of the filter bag 3-1 is fixedly connected with the bottom of a cover plate 1-3, an air outlet 1-4 penetrates through the cover plate 1-3 and is arranged in the filter bag 3-1, the nut 3-2 is fixed at the lower end of the filter bag 3-1, the motor 3-3 is fixed at the lower end of the cover plate 1-3, one end of the screw rod 3-4 is rotatably connected with a shaft bracket 1-5, the other end of the screw rod 3-4 is fixedly connected with an output shaft of the motor 3-3, the nut 3-2 is rotatably connected with the screw rod 3-4, one end of the spring 3-5 is fixedly connected with the inner wall of a collection barrel 1-1, the other end of the spring 3-5 is fixedly connected with the filter bag 3-1, the spring 3-5 is provided in plurality.
The water filtration device 4 includes: the water tank is characterized by comprising a water tank 4-1, an air inlet pipe 4-2, a limiting column 4-3, a floating plate 4-4 and an air outlet 4-5, wherein the water tank 4-1 is fixed on the cover plate 1-3, the air inlet pipe 4-2 is arranged on the side face of the water tank 4-1, the air inlet pipe 4-2 is fixedly communicated with the air outlet 1-4, the limiting column 4-3 is vertically fixed inside the water tank 4-1, the floating plate 4-4 is horizontally connected with the limiting column 4-3 in a sliding mode, and the air outlet 4-5 is arranged at the top of the water tank 4-1.
The vibration device 2-5-4 includes: the vibration motor is fixed in the shell, and the shell is fixed with the limiting plates 2-5-3 positioned at the upper end.
A method of a dust extraction apparatus for coal mining, the method comprising the steps of:
the method comprises the following steps: the electric telescopic rod 1-6 is electrified, and the angle of the air suction pump 2-2 can be adjusted;
step two: pulling the filter plate 2-5-2 to move, electrifying the vibrating device 2-5-4 and cleaning ash;
step three: the motor 3-3 is electrified to drive the screw rod 3-4 to rotate, the screw rod 3-4 rotates to drive the nut 3-2 to move, the nut 3-2 moves to drive the filter bag 3-1 to move, and dust removal can be carried out.
The working principle of the invention is as follows:
the device is placed inside a mine hole and is connected with an external power supply, an electric telescopic rod 1-6 is electrified and extended, and slides along a chute 2-3 to drive an ash suction box 2-1 to rotate by taking a hinged column 1-7 which is rotatably connected as a circle center, so that the angle of an air suction pump 2-2 can be adjusted, the ash suction angle can be adjusted, and the adjustment can be carried out according to the distribution of dust; the air suction pump 2-2 is electrified to suck air with dust into the dust suction box 2-1, the air with dust can filter out dust impurities with larger particles through a plurality of filter plates 2-5-2 arranged on a filter device 2-5, the device can clean the filter plates 2-5-2 under the non-stop state, pull one of the filter plates 2-5-2 to move upwards to enable the filter plate 2-5-2 to move out of the dust suction box 2-1, then electrify a vibrating device 2-5-4 to drive the filter plates 2-5-2 to vibrate, the filter plates 2-5-2 vibrate to shake the dust adsorbed at the upper end into a collecting cover 2-4 to be collected, and push the filter plates 2-5-2 to reset after cleaning is completed, other filter plates can be cleaned in the same way; the air with large particles filtered enters the collecting barrel 1-1 through the corrugated pipe 2-6, the air with dust is filtered by the filter bag 3-1 and then is discharged through the air outlet 1-4, the air with dust passes through the filter bag 3-1, and the filter bag 3-1 can absorb small particles of dust and dust in the air; the motor 3-3 is electrified to drive the screw rod 3-4 to rotate, the screw rod 3-4 is rotated to drive the nut 3-2 to move upwards through the limiting action of the spring 3-5, meanwhile, the spring 3-5 is stretched, the nut 3-2 moves to drive the filter bag 3-1 to move, fold and deform, the filter bag 3-1 deforms to enable dust and dust adsorbed at the upper end to fall to the bottom of the collecting barrel 1-1, the dust and dust can be discharged through the dust outlet 1-2, the motor 3-3 is reversely rotated to drive the filter bag 3-1 to reset, meanwhile, the filter bag 3-1 can be unfolded through the action of the spring 3-5, and the contact area of the filter bag 3-1 can be increased; the water tank 4-1 is filled with water in advance, so that the water level is higher than the air inlet pipe 4-2, the gas discharged from the air outlet 1-4 enters the water tank 4-1 through the air inlet pipe 4-2 and is sprayed into the water in the water tank 4-1, the residual dust in the air can be further reduced by the water, and the filtered air is discharged through the air outlet 4-5 to finish dust removal. The floating plate 4-4 can float on the water surface, and can reduce the water splash in the water tank 4-1.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The utility model provides a dust collector for coal mining which characterized in that: the method comprises the following steps: device (4) is considered to collection ash device (1), ash suction device (2), filter equipment (3) and water, ash suction device (2) and the fixed intercommunication of the lateral wall of collection ash device (1), ash suction device (2) sets up to a plurality ofly, ash collection device (1) inside is fixed with filter equipment (3), ash collection device (1) upper end is fixed with water and considers device (4), device (4) and collection ash device (1) intercommunication are considered to water.
2. The dust removing device for coal mining of claim 1, wherein: the ash collecting device (1) comprises: a collecting barrel (1-1), an ash outlet (1-2), a cover plate (1-3), an air outlet (1-4), a shaft bracket (1-5), an electric telescopic rod (1-6) and a hinged column (1-7), an ash outlet (1-2) is arranged at the bottom of the collecting barrel (1-1), a cover plate (1-3) is arranged at the top of the collecting barrel (1-1) in a sealing way, the cover plate (1-3) is provided with an air outlet (1-4), the collecting barrel (1-1) is horizontally fixed with a shaft bracket (1-5), the fixed end of the electric telescopic rod (1-6) is fixedly connected with the collecting barrel (1-1), articulated columns (1-7) are horizontally fixed on the outer side surface of the collecting barrel (1-1), and the electric telescopic rods (1-6) are arranged in a plurality.
3. The dust removing device for coal mining of claim 2, wherein: the plurality of dust suction devices (2) each comprise: the dust suction box comprises a dust suction box (2-1), an air suction pump (2-2), a sliding chute (2-3), a collection cover (2-4), a filtering device (2-5) and a corrugated pipe (2-6), wherein the air suction pump (2-2) is fixedly communicated with one end of the dust suction box (2-1), the sliding chute (2-3) is arranged at the lower end of the dust suction box (2-1), the movable end of an electric telescopic rod (1-6) is connected with the sliding chute (2-3) in a sliding manner, one end of the sliding chute (2-3) is rotatably connected with a hinged column (1-7), the collection cover (2-4) is arranged at the upper end of the dust suction box (2-1), the filtering device (2-5) is inserted into the dust suction box (2-1) in a sliding and sealing manner, and a plurality of filtering devices (2-5) are arranged, the filter device (2-5) is arranged in the collecting cover (2-4), the other end of the dust suction box (2-1) is provided with a corrugated pipe (2-6), and the corrugated pipe (2-6) is fixedly communicated with the dust suction box (2-1).
4. The dust removing device for coal mining of claim 3, wherein: a plurality of said filtering means (2-5) comprising: the device comprises a limiting guide wheel (2-5-1), a filter plate (2-5-2), limiting plates (2-5-3) and a vibrating device (2-5-4), wherein the upper end of the dust suction box (2-1) is rotatably connected with the limiting guide wheel (2-5-1), the number of the limiting guide wheels (2-5-1) is two, the two limiting guide wheels (2-5-1) are symmetrically arranged, the filter plate (2-5-2) is inserted into the dust suction box (2-1) in a sliding and sealing manner, the size of the filter plate (2-5-2) is matched with that of the dust suction box (2-1), the filter plate (2-5-2) is arranged between the two guide wheels (2-5-1), the two guide wheels (2-5-1) are abutted against the filter plate (2-5-2), limiting plates (2-5-3) are arranged at the upper end and the lower end of the filter plate (2-5-2), and a vibrating device (2-5-4) is fixed on the limiting plate (2-5-3) at the upper end.
5. The dust removing device for coal mining of claim 2, wherein: the filtering device (3) comprises: the filter bag comprises a filter bag body (3-1), a nut (3-2), a motor (3-3), a screw rod (3-4) and a spring (3-5), wherein the upper end of the filter bag body (3-1) is fixedly connected with the bottom of the cover plate (1-3), an air outlet (1-4) penetrates through the cover plate (1-3) and is arranged in the filter bag body (3-1), the nut (3-2) is fixed at the lower end of the filter bag body (3-1), the motor (3-3) is fixed at the lower end of the cover plate (1-3), one end of the screw rod (3-4) is rotatably connected with a shaft bracket (1-5), the other end of the screw rod (3-4) is fixedly connected with an output shaft of the motor (3-3), and the nut (3-2) is rotatably connected with the screw rod (3-4), one end of each spring (3-5) is fixedly connected with the inner wall of the collecting barrel (1-1), the other end of each spring (3-5) is fixedly connected with the corresponding filter bag (3-1), and the number of the springs (3-5) is multiple.
6. The dust removing device for coal mining of claim 2, wherein: the water filtration device (4) comprises: the water tank is characterized by comprising a water tank (4-1), an air inlet pipe (4-2), a limiting column (4-3), a floating plate (4-4) and an air outlet (4-5), wherein the water tank (4-1) is fixed on the cover plate (1-3), the air inlet pipe (4-2) is arranged on the side face of the water tank (4-1), the air inlet pipe (4-2) is fixedly communicated with the air outlet (1-4), the limiting column (4-3) is vertically fixed in the water tank (4-1), the floating plate (4-4) is horizontally connected with the limiting column (4-3) in a sliding mode, and the air outlet (4-5) is formed in the top of the water tank (4-1).
7. The dust removing device for coal mining of claim 4, wherein: the vibration device (2-5-4) includes: the vibration motor is fixed in the shell, and the shell is fixed with the limiting plate (2-5-3) positioned at the upper end.
8. A method of using a dust extraction apparatus for coal mining as claimed in claim 6, wherein: the method comprises the following steps:
the method comprises the following steps: the electric telescopic rods (1-6) are electrified, so that the angle of the air suction pump (2-2) can be adjusted;
step two: the filter plate (2-5-2) is pulled to move, and the vibrating device (2-5-4) is electrified to clean ash;
step three: the motor (3-3) is electrified to drive the screw rod (3-4) to rotate, the screw rod (3-4) rotates to drive the nut (3-2) to move, and the nut (3-2) moves to drive the filter bag (3-1) to move, so that dust can be removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210239907.8A CN114471061A (en) | 2022-03-12 | 2022-03-12 | Dust removal device and method for coal mining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210239907.8A CN114471061A (en) | 2022-03-12 | 2022-03-12 | Dust removal device and method for coal mining |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114471061A true CN114471061A (en) | 2022-05-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210239907.8A Pending CN114471061A (en) | 2022-03-12 | 2022-03-12 | Dust removal device and method for coal mining |
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| Country | Link |
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| CN (1) | CN114471061A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116672820A (en) * | 2023-08-04 | 2023-09-01 | 黑龙江科技大学 | Mining dust collector |
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| CN101884866A (en) * | 2010-08-11 | 2010-11-17 | 南通克莱克空气处理设备有限公司 | Pneumatic dust-cleaning device of bag-type dust remover and dust-cleaning method thereof |
| CN105642066A (en) * | 2016-03-24 | 2016-06-08 | 太仓运权化工防腐设备有限公司 | Mist and dust purification system of industrial and mining enterprises |
| CN110694382A (en) * | 2019-11-14 | 2020-01-17 | 代连朋 | Multi-angle coal mine dust removal equipment |
| CN211950555U (en) * | 2020-04-14 | 2020-11-17 | 刘钟 | Coal mine ventilation dust removal device |
| CN112295336A (en) * | 2020-11-06 | 2021-02-02 | 安徽省海徽化工有限公司 | Air filter for producing formaldehyde |
| CN214862044U (en) * | 2021-02-03 | 2021-11-26 | 桐庐鼎力建材有限公司 | Dust collector is used in cement processing production |
-
2022
- 2022-03-12 CN CN202210239907.8A patent/CN114471061A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101884866A (en) * | 2010-08-11 | 2010-11-17 | 南通克莱克空气处理设备有限公司 | Pneumatic dust-cleaning device of bag-type dust remover and dust-cleaning method thereof |
| CN105642066A (en) * | 2016-03-24 | 2016-06-08 | 太仓运权化工防腐设备有限公司 | Mist and dust purification system of industrial and mining enterprises |
| CN110694382A (en) * | 2019-11-14 | 2020-01-17 | 代连朋 | Multi-angle coal mine dust removal equipment |
| CN211950555U (en) * | 2020-04-14 | 2020-11-17 | 刘钟 | Coal mine ventilation dust removal device |
| CN112295336A (en) * | 2020-11-06 | 2021-02-02 | 安徽省海徽化工有限公司 | Air filter for producing formaldehyde |
| CN214862044U (en) * | 2021-02-03 | 2021-11-26 | 桐庐鼎力建材有限公司 | Dust collector is used in cement processing production |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116672820A (en) * | 2023-08-04 | 2023-09-01 | 黑龙江科技大学 | Mining dust collector |
| CN116672820B (en) * | 2023-08-04 | 2023-10-27 | 黑龙江科技大学 | Mining dust collector |
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Application publication date: 20220513 |
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