CN114876559A - Atomizing dust removal device for coal mine - Google Patents
Atomizing dust removal device for coal mine Download PDFInfo
- Publication number
- CN114876559A CN114876559A CN202210748551.0A CN202210748551A CN114876559A CN 114876559 A CN114876559 A CN 114876559A CN 202210748551 A CN202210748551 A CN 202210748551A CN 114876559 A CN114876559 A CN 114876559A
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- Prior art keywords
- dust
- dust removal
- coal mine
- vehicle body
- fixedly connected
- Prior art date
- 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.)
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- 239000000428 dust Substances 0.000 title claims abstract description 92
- 239000003245 coal Substances 0.000 title claims abstract description 25
- 230000007246 mechanism Effects 0.000 claims abstract description 30
- 230000014759 maintenance of location Effects 0.000 claims abstract description 19
- 238000004140 cleaning Methods 0.000 claims abstract description 14
- 238000000889 atomisation Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 6
- 239000003595 mist Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000010405 clearance mechanism Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
- E21F5/02—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires by wetting or spraying
- E21F5/04—Spraying barriers
-
- 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
- E21F5/20—Drawing-off or depositing dust
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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)
- Cleaning Of Streets, Tracks, Or Beaches (AREA)
Abstract
The invention discloses an atomization dust removal device for a coal mine, and relates to the technical field of coal mine dust removal equipment. The dust removal device comprises a dust removal mechanism, wherein the dust removal mechanism is provided with a dust retention mechanism and a cleaning mechanism, and the dust removal mechanism comprises a vehicle body, a controller arranged on the vehicle body and an atomization assembly rotatably connected to the top of the vehicle body. The dust-settling device can suck falling dust into the dust-settling box by starting the suction fan to be matched with the structures such as the suction hood, the corrugated pipe and the like, not only can accelerate the settling rate of the dust, but also can perform centralized treatment on the dust, so that the dust-settling effect is improved, the first rotating shaft is driven to rotate by the starting motor, the toothed ring is driven to move up and down by the rotation of the arranged driving wheel, so that the toothed teeth outside the toothed ring drive the arc-shaped gear to rotate, the suction hood can also swing up and down around the second rotating shaft, the suction hood is convenient to adjust when the dust is absorbed, the suction range is expanded, and the dust-settling rate and the dust-settling effect of the device are further improved.
Description
Technical Field
The invention relates to the technical field of coal mine dust removal equipment, in particular to an atomization dust removal device for a coal mine
Background
At present at coal mining's in-process, if drilling, the blasting, the operation of digging, roof management, each link such as loading and transporting of coal, all can produce a large amount of dusts, the dust is the suspended state generally in the air, reach certain concentration or receive the impact wave's influence and can take place the secondary explosion, serious potential safety hazard has, and different mines are because the coal, the rock geological conditions, the mode of digging, the difference of exploitation scale and mechanization degree, the dust produces intensity and diffusion rate and also is different, consequently, in order to guarantee colliery staff's life safety and occupational health, the colliery can adopt a series of dust fall equipment to remove dust, wherein the water smoke dust fall is comparatively common one kind, its principle is: water is pressurized and sprayed out by a spray head to form water mist, and the water mist is dispersed into the air and is in contact with dust to be fused, so that larger dust particles are formed and then fall down, and the dust falling function is realized.
When the existing coal mine dust removal equipment is used, atomized dust can not fall down quickly generally, the dust falls down naturally under the action of gravity only by means of combination of water mist and dust, the efficiency is low, and when a certain region needs quick dust fall, the traditional equipment is difficult to meet.
Therefore, the atomizing dust removal device for the coal mine is provided.
Disclosure of Invention
The invention aims to provide an atomization dust removal device for a coal mine, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: an atomizing dust-removing device for coal mine comprises a dust-removing mechanism, wherein the dust-removing mechanism is provided with a dust-retaining mechanism and a cleaning mechanism, the dust-removing mechanism comprises a vehicle body, a controller arranged on the vehicle body, and an atomizing component rotationally connected to the top of the vehicle body, the dust-retaining mechanism comprises a suction fan fixedly connected to the bottom of the inner wall of the vehicle body, a dust-retaining box fixedly connected to the inlet end of the suction fan, a square groove arranged on the side wall of the vehicle body, a suction hood rotationally connected to the side wall of the square groove, a corrugated pipe fixedly connected to the suction hood, an arc gear fixedly connected to the side wall of the suction hood, a first supporting sleeve fixedly connected to the side wall of the dust-retaining box, a toothed ring movably connected to the first supporting sleeve, a driving wheel movably connected to the toothed ring, and a first rotating shaft fixedly connected to the driving wheel, the cleaning mechanism comprises a filter screen movably connected inside the dust stagnation box, a reciprocating screw rod rotatably connected inside the dust stagnation box, a nut seat rotatably connected on the reciprocating screw rod, and a cleaning brush fixedly connected on the nut seat.
Further, the atomization component is connected including rotating the support at automobile body top, rotate and be connected atomizing water cannon on the support, articulate the hydraulic stem of atomizing water cannon bottom, connect pipe, the connection on the atomizing water cannon are in the storage water tank of the pipe other end.
Furthermore, the two sides of the air suction cover are provided with second rotating shafts, and the second rotating shafts are movably connected to the side wall of the square groove through bearings.
Furthermore, one end of the corrugated pipe is connected to the air suction cover, and the other end of the corrugated pipe is connected to the side wall of the dust stagnation box.
Furthermore, the arc gear is semicircular, and the arc gear is fixedly connected to the air suction cover through a connecting plate.
Furthermore, the inner wall of the toothed ring is provided with teeth matched with the driving wheel, and the outer side of the toothed ring is also provided with teeth matched with the arc-shaped gear.
Furthermore, one end of the first rotating shaft is fixedly connected with a motor, and the first rotating shaft is in transmission connection with the reciprocating screw rod through a transmission belt.
Furthermore, a threaded hole matched with the reciprocating screw rod is formed in the nut seat.
The invention has at least the following beneficial effects:
the suction fan is started to be matched with structures such as a suction hood, a corrugated pipe and the like, falling dust can be sucked into the dust retention box, the dust settling rate can be accelerated, the dust can be intensively treated, the dust retention effect is improved, the starting motor drives the first rotating shaft to rotate, the driving wheel is arranged to rotate to drive the toothed ring to move up and down, teeth outside the toothed ring drive the arc gear to rotate, the suction hood can also swing up and down around the second rotating shaft, the suction hood is convenient to adjust when absorbing dust, the suction range is expanded, the dust fall rate and the dust fall effect of the device are further improved, meanwhile, the reciprocating screw rod rotates and is matched with the nut seat, the cleaning brush can be driven to move left and right on the surface of the filter screen, the dust on the surface of the filter screen can be cleaned conveniently when the dust is retained, and the influence on the filtering effect of the filter screen is avoided, the purification quality of the air in the coal mine is reduced.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
FIG. 1 is a first perspective view of the overall structure of the present invention;
FIG. 2 is a second perspective view of the overall structure of the present invention;
FIG. 3 is a perspective view of the dust retention mechanism of the present invention;
FIG. 4 is a perspective view of the ring gear structure of the present invention;
FIG. 5 is a perspective view of the belt structure of the present invention;
FIG. 6 is a perspective view of the cleaning mechanism of the present invention.
Reference numerals:
100. a dust removal mechanism; 101. a vehicle body; 102. a controller; 103. an atomizing assembly; 1031. a support; 1032. atomizing water cannons; 1033. a hydraulic lever; 1034. a conduit; 1035. a water storage tank;
200. a dust retention mechanism; 201. a suction fan; 202. a dust stagnation box; 203. a square groove; 204. an air suction hood; 205. a bellows; 206. an arc gear; 207. a first support sleeve; 208. a toothed ring; 209. a drive wheel; 210. a first rotating shaft; 211. a second rotating shaft; 212. a second support sleeve;
300. a cleaning mechanism; 301. a filter screen; 302. a reciprocating screw rod; 303. a nut seat; 304. cleaning a brush; 305. a transmission belt.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Referring to fig. 1-6, the present invention provides a technical solution: the utility model provides an atomizing dust collector for coal mine, includes dust removal mechanism 100, is provided with dust retention mechanism 200 and clearance mechanism 300 on the dust removal mechanism 100, and dust removal mechanism 100 includes automobile body 101, sets up controller 102 on automobile body 101, rotates the atomizing subassembly 103 of connecting at automobile body 101 top, and controller 102 all supplies power through external power source with atomizing subassembly 103.
It should be noted that, the atomizing assembly 103 includes a bracket 1031 rotatably connected to the top of the vehicle body 101, an atomizing water cannon 1032 rotatably connected to the bracket 1031, a hydraulic rod 1033 hinged to the bottom of the atomizing water cannon 1032, the bottom of the hydraulic rod 1033 is hinged to the bracket 1031, which facilitates vertical adjustment of the atomizing water cannon 1032, a conduit 1034 connected to the atomizing water cannon 1032, a water storage tank 1035 connected to the other end of the conduit 1034, a water filling port is opened on the side wall of the water storage tank 1035, and one end of the conduit 1034 is connected with a pump body, which is arranged inside the water storage tank 1035, and the pump body is started to convey water inside the water storage tank 1035 to the atomizing water cannon 1032, so as to perform atomizing and dedusting operations in a coal mine.
The dust retention mechanism 200 comprises a suction fan 201 fixedly connected to the bottom of the inner wall of the vehicle body 101, a dust retention box 202 fixedly connected to the inlet end of the suction fan 201, a movable door is arranged at the bottom of the dust retention box 202, a through hole matched with the movable door is formed in the bottom of the vehicle body 101, the movable door is opened to conveniently and intensively clean dust inside the dust retention box 202, a square groove 203 is formed in the side wall of the vehicle body 101, a suction hood 204 rotatably connected to the side wall of the square groove 203, a corrugated pipe 205 fixedly connected to the suction hood 204, one end of the corrugated pipe 205 is connected to the suction hood 204, the other end of the corrugated pipe is connected to the side wall of the dust retention box 202 to conveniently provide movable allowance for the suction hood 204, an arc gear 206 fixedly connected to the side wall of the suction hood 204, the arc gear 206 is semicircular, the arc gear 206 is fixedly connected to the suction hood 204 through a connecting plate, and a first supporting sleeve 207, a second supporting sleeve, a third supporting sleeve, a fourth supporting sleeve and a fourth supporting sleeve, a fourth, Swing joint is at ring gear 208 on first supporting sleeve 207, swing joint drive wheel 209 on ring gear 208, the first pivot 210 of fixed connection on drive wheel 209, the one end fixedly connected with motor of first pivot 210, and motor fixed connection is on the inner wall of automobile body 101, is convenient for provide the power supply for first pivot 210, and the motor supplies power through external power source.
It should be noted that the shape of the air suction hood 204 is a trapezoidal table, the second rotating shaft 211 is arranged on both sides of the air suction hood 204, and the second rotating shaft 211 is movably connected to the side wall of the square groove 203 through a bearing.
Further, as shown in fig. 3, the driving wheel 209 is a missing gear, the inner wall of the toothed ring 208 is provided with teeth adapted to the driving wheel 209, and the outer side of the toothed ring 208 is also provided with teeth adapted to the arc-shaped gear 206, when the driving wheel 209 rotates clockwise, it will first mesh with the teeth on the left side of the inner wall of the toothed ring 208 and drive the toothed ring 208 to move upward, and then the driving wheel 209 continues to rotate to mesh with the teeth on the right side of the inner wall of the toothed ring 208 and drive the toothed ring 208 to move downward, so that the toothed ring 208 can reciprocate up and down.
On the other hand, the second support sleeve 212 is movably sleeved on the outer surface of the first rotating shaft 210, and the second support sleeve 212 is fixedly connected to the inner wall of the vehicle body 101, so that the second support sleeve 212 can support the first rotating shaft 210 when rotating.
Specifically, when dust removal and dust retention are needed, at first, the atomizing assembly 103 is started to spray water mist in the environment outside the box, so that the water mist is in contact with dust in the air and fused, the dust removal function is realized, in the atomizing process, the suction fan 201 is started to enable the suction fan to be matched with the suction hood 204, the corrugated pipe 205 and other structures, the falling dust can be sucked into the dust retention box 202, the dust can be conveniently and intensively treated, the dust retention effect is improved, then the first rotating shaft 210 is driven to rotate through the starting motor, the tooth ring 208 is driven to rotate through the rotation of the driving wheel 209, the tooth teeth outside the tooth ring 208 drive the arc-shaped gear 206 to rotate, the suction hood 204 can be driven to swing up and down around the second rotating shaft 211, the suction hood 204 can be adjusted when dust is absorbed, the air suction range is expanded, and the dust removal rate and the dust removal effect of the device are further improved.
The cleaning mechanism 300 comprises a filter screen 301 movably connected inside the dust stagnation box 202, dust inside the dust stagnation box 202 is conveniently filtered, a reciprocating screw rod 302 rotatably connected inside the dust stagnation box 202 and a nut seat 303 rotatably connected on the reciprocating screw rod 302 are rotatably connected, a threaded hole matched with the reciprocating screw rod 302 and a cleaning brush 304 fixedly connected on the nut seat 303 are formed in the nut seat 303.
It should be noted that the first rotating shaft 210 is in transmission connection with the reciprocating screw rod 302 through a transmission belt 305, and when the first rotating shaft 210 rotates, the reciprocating screw rod 302 is driven to rotate at the same time.
Specifically, as shown in fig. 6, when the first rotating shaft 210 rotates, the driving belt 305 is arranged, the reciprocating screw rod 302 can be driven to rotate simultaneously, then the cleaning brush 304 can be driven to move left and right on the surface of the filter screen 301 through the arranged nut seat 303, so that the coal dust on the surface of the filter screen 301 can be cleaned conveniently when the dust is stuck, the filter effect of the filter screen 301 is prevented from being influenced, and the purification quality of the air in the coal mine is reduced.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. When an element is referred to as being "mounted to," "secured to," or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the disclosure. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Claims (8)
1. An atomizing dust removal device for a coal mine comprises a dust removal mechanism (100), and is characterized in that a dust retention mechanism (200) and a cleaning mechanism (300) are arranged on the dust removal mechanism (100);
the dust removal mechanism (100) comprises a vehicle body (101), a controller (102) arranged on the vehicle body (101), and an atomization component (103) rotatably connected to the top of the vehicle body (101);
the dust retention mechanism (200) comprises a suction fan (201) fixedly connected to the bottom of the inner wall of the vehicle body (101), a dust retention box (202) fixedly connected to the inlet end of the suction fan (201), a square groove (203) formed in the side wall of the vehicle body (101), a suction hood (204) rotatably connected to the side wall of the square groove (203), a corrugated pipe (205) fixedly connected to the suction hood (204), an arc gear (206) fixedly connected to the side wall of the suction hood (204), a first support sleeve (207) fixedly connected to the side wall of the dust retention box (202), a toothed ring (208) movably connected to the first support sleeve (207), a driving wheel (209) movably connected to the toothed ring (208), and a first rotating shaft (210) fixedly connected to the driving wheel (209);
the cleaning mechanism (300) comprises a filter screen (301) movably connected inside the dust stagnation box (202), a reciprocating screw rod (302) rotatably connected inside the dust stagnation box (202), a nut seat (303) rotatably connected on the reciprocating screw rod (302), and a cleaning brush (304) fixedly connected on the nut seat (303).
2. The atomized dust removal device for the coal mine as set forth in claim 1, wherein: the atomization assembly (103) comprises a bracket (1031) rotatably connected to the top of the vehicle body (101), an atomization water cannon (1032) rotatably connected to the bracket (1031), a hydraulic rod (1033) hinged to the bottom of the atomization water cannon (1032), a conduit (1034) connected to the atomization water cannon (1032), and a water storage tank (1035) connected to the other end of the conduit (1034).
3. The atomized dust removal device for the coal mine as set forth in claim 1, wherein: two sides of the air suction cover (204) are provided with second rotating shafts (211), and the second rotating shafts (211) are movably connected to the side wall of the square groove (203) through bearings.
4. The atomized dust removal device for the coal mine as set forth in claim 1, wherein: one end of the corrugated pipe (205) is connected to the air suction cover (204), and the other end of the corrugated pipe is connected to the side wall of the dust retention box (202).
5. The atomized dust removal device for the coal mine as set forth in claim 1, wherein: the arc-shaped gear (206) is semicircular, and the arc-shaped gear (206) is fixedly connected to the air suction cover (204) through a connecting plate.
6. The atomized dust removal device for the coal mine as set forth in claim 1, wherein: the inner wall of the gear ring (208) is provided with teeth matched with the driving wheel (209), and the outer side of the gear ring (208) is also provided with teeth matched with the arc-shaped gear (206).
7. The atomized dust removal device for the coal mine as set forth in claim 1, wherein: one end of the first rotating shaft (210) is fixedly connected with a motor, and the first rotating shaft (210) is in transmission connection with the reciprocating screw rod (302) through a transmission belt (305).
8. The atomized dust removal device for the coal mine as set forth in claim 1, wherein: the interior of the nut seat (303) is provided with a threaded hole matched with the reciprocating screw rod (302).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210748551.0A CN114876559A (en) | 2022-06-28 | 2022-06-28 | Atomizing dust removal device for coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210748551.0A CN114876559A (en) | 2022-06-28 | 2022-06-28 | Atomizing dust removal device for coal mine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114876559A true CN114876559A (en) | 2022-08-09 |
Family
ID=82683443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210748551.0A Withdrawn CN114876559A (en) | 2022-06-28 | 2022-06-28 | Atomizing dust removal device for coal mine |
Country Status (1)
| Country | Link |
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| CN (1) | CN114876559A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117755863A (en) * | 2024-02-22 | 2024-03-26 | 北票合兴实业有限公司 | dust collecting equipment for ore processing workshop |
-
2022
- 2022-06-28 CN CN202210748551.0A patent/CN114876559A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117755863A (en) * | 2024-02-22 | 2024-03-26 | 北票合兴实业有限公司 | dust collecting equipment for ore processing workshop |
| CN117755863B (en) * | 2024-02-22 | 2024-05-07 | 北票合兴实业有限公司 | Dust collecting equipment for ore processing workshop |
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Application publication date: 20220809 |