CN114700139A - Stone crushing device for mining - Google Patents
Stone crushing device for mining Download PDFInfo
- Publication number
- CN114700139A CN114700139A CN202210244983.8A CN202210244983A CN114700139A CN 114700139 A CN114700139 A CN 114700139A CN 202210244983 A CN202210244983 A CN 202210244983A CN 114700139 A CN114700139 A CN 114700139A
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- Prior art keywords
- stone
- gears
- box body
- mining
- rotating rollers
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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.)
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- 239000004575 stone Substances 0.000 title claims abstract description 91
- 238000005065 mining Methods 0.000 title claims description 15
- 238000007873 sieving Methods 0.000 claims abstract description 18
- 238000012216 screening Methods 0.000 claims abstract description 15
- 238000005192 partition Methods 0.000 claims description 9
- 239000011435 rock Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 abstract description 11
- 238000000034 method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
- B02C4/08—Crushing or disintegrating by roller mills with two or more rollers with co-operating corrugated or toothed crushing-rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
- B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/42—Driving mechanisms; Roller speed control
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
The invention discloses a stone breaking device for mine opening, which comprises a box body, wherein a first stone breaking device and a second stone breaking device are arranged in the box body, the first stone breaking device is used for primary breaking of stones, and the second stone breaking device is used for secondary breaking of the stones; the interior of the box body is also provided with a screening device, the screening device is used for screening the crushed stones and is connected with a conveying device, and the conveying device is used for conveying the stones which are not crushed to enable the stones to enter the interior of the box body again for secondary crushing; this device passes through sieving mechanism and conveyor's setting, has a screening effect to not by broken stone to carry it once more and carry out the secondary crushing inside of box, then pass through the sieving mechanism screening again, so circulation is reciprocal, and crushing effect is better, can guarantee the size of the stone volume after the breakage.
Description
Technical Field
The invention relates to the technical field of stone breaking devices, in particular to a stone breaking device for mine exploitation.
Background
The mine comprises coal mines, metal mines, non-metal mines, building material mines, chemical mines and the like, the scale of the mine is generally expressed by annual output or daily output, the annual output, namely the quantity of ores produced by the mine every year, is divided into 3 types of large, medium and small according to the output, and a plurality of production processes and procedures of the mine in the mining process, such as the processes of drilling, blasting, ore falling and rock loading, need to use a stone crusher to completely crush stones in the mine so as to meet the requirements of production and processing.
Carry out broken in-process to stone and need use the rubble device, but present rubble device all crushes through grinding wheel pair stone, and this kind of rubble method can carry out fine breakage to the ore, but the volume size of the rubble after this kind of rubble device can not guarantee to break, and then has leaded to the effect of rubble perfect inadequately.
Disclosure of Invention
The invention aims to provide a stone breaking device for mine exploitation, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a stone crushing device for mining comprises a box body, wherein a first stone crushing device and a second stone crushing device are arranged inside the box body, the first stone crushing device is used for primary crushing of stones, and the second stone crushing device is used for secondary crushing of the stones; the inside of box still is equipped with the sieving mechanism, the sieving mechanism is used for screening the stone after the breakage, the sieving mechanism is connected with conveyor, conveyor is used for transmitting the stone that is not broken, makes its inside that enters into the box once more carry out the secondary crushing.
As a preferred embodiment of the present invention: the top of box is equipped with the feeder hopper, the feeder hopper is located first breaker directly over.
As a still further preferable embodiment of the present invention: the inside of box is equipped with the baffle, first breaker and second breaker are located the both sides of baffle respectively.
As a still further preferable embodiment of the present invention: the screening device comprises a screen plate, wherein one end of the screen plate is downwards inclined, and the downwards inclined end of the screen plate is connected with the conveying device.
As a still further preferable embodiment of the present invention: the two ends of the screen plate are provided with connecting blocks, the inner wall of the box body is provided with a groove, and the connecting blocks are located in the groove and are movably connected with the groove through springs.
As a still further preferable embodiment of the present invention: the drainage plate is arranged below the screen plate, one end of the drainage plate, far away from the conveying device, inclines downwards, and a discharge hole is formed in one end, inclined downwards, of the drainage plate and the side wall of the box body.
As a still further preferable embodiment of the present invention: conveyor includes the conveyer pipe, the inside of conveyer pipe is equipped with the dwang, be equipped with the spiral propulsion blade on the dwang, the output fixed connection of dwang and first motor, be equipped with the passageway on the lateral wall of conveyer pipe, the passageway is connected with the box, the exit of passageway is located the second rubble device directly over.
As a still further preferable embodiment of the present invention: the lower part of the second stone breaking device is provided with an inclined plate, one end of the inclined plate, which is far away from the conveying device, is inclined downwards and is positioned under the partition plate, and the other end of the inclined plate is fixedly connected with the inner wall of the box body.
As a still further preferable embodiment of the present invention: first rubble device includes two first live rollers that distribute relatively, second rubble device includes two second live rollers that distribute relatively, all be equipped with broken tooth on first live roller and the second live roller, first live roller all runs through the lateral wall of box and is connected with the outside drive arrangement of box with the second live roller.
As a still further preferable embodiment of the present invention: drive arrangement includes second motor, first gear, second gear, third gear and third gear, the output and the second of second motor rotate roller fixed connection, the quantity of first gear be two and respectively with two first rotate roller fixed connection, first gear intermeshing, the quantity of second gear be two and respectively with two second rotate roller fixed connection, second gear intermeshing, third gear and one of them first rotate roller fixed connection, fourth gear and one of them second rotate roller fixed connection, the third gear is connected through the chain with the fourth gear.
Compared with the prior art, the invention has the beneficial effects that: this device is when carrying out the breakage to the stone, at first carry out first breakage to the stone through first rubble device, stone after the breakage can be through a sieving mechanism, the sieving mechanism has a screening function to the stone, wherein the great stone of volume can enter into conveyor's inside, conveyor has a transport function to the stone, make the stone can reentrant the inside of box, can pass through second rubble device when stone reenters the inside of box, second rubble device can carry out the breakage once more to it, stone after the secondary breakage can be through sieving mechanism once more, so the circulation is reciprocal, crushing effect is better, can guarantee the size of the stone volume after the breakage.
Drawings
FIG. 1 is a front view of the whole structure of a stone breaking device for mine excavation.
Fig. 2 is an enlarged view of a rock breaking device for mine exploitation at a point a in fig. 1.
Fig. 3 is a schematic diagram of the connection of a driving device of the stone breaking device for mine exploitation.
In the figure: the device comprises a box body 1, a flow guide plate 2, a discharge port 3, a first rotating roller 4, crushing teeth 5, a feed hopper 6, a partition plate 7, a second rotating roller 8, a channel 9, a first motor 10, a rotating rod 11, a spiral propelling blade 12, a sloping plate 13, a conveying pipe 14, a screen plate 15, a connecting block 16, a groove 17, a spring 18, a first gear 19, a second gear 20, a third gear 21, a fourth gear 22, a chain 23 and a second motor 24.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In this embodiment, please refer to fig. 1, a stone crushing device for mine mining comprises a box body 1, wherein a first stone crushing device and a second stone crushing device are arranged in the box body 1, the first stone crushing device is used for primary crushing of stones, and the second stone crushing device is used for secondary crushing of stones; the inside of box 1 still is equipped with the sieving mechanism, the sieving mechanism is used for screening the stone after the breakage, the sieving mechanism is connected with conveyor, conveyor is used for transmitting the stone that is not broken, makes its inside that enters into box 1 once more carry out the secondary crushing.
This device is when carrying out the breakage to the stone, at first carry out first breakage to the stone through first rubble device, stone after the breakage can be through a sieving mechanism, the sieving mechanism has a screening function to the stone, wherein the great stone of volume can enter into conveyor's inside, conveyor has a transport function to the stone, make the stone can reentrant the inside of box 1, can pass through second rubble device when the stone reenters the inside of box 1, second rubble device can carry out the breakage once more to it, stone after the secondary breakage can be through sieving mechanism once more, so the circulation is reciprocal, crushing effect is better, can guarantee the size of the stone volume after the breakage.
In another embodiment, please refer to fig. 1, a feed hopper 6 is arranged at the top of the box body 1, and the feed hopper 6 is positioned right above the first crushing device; the setting of feeder hopper 6 makes things convenient for pouring into of stone, wherein feeder hopper 6 is located first breaker and makes the stone in case enter into the inside of box and can carry out the breakage directly over, has improved broken efficiency.
In another embodiment, referring to fig. 1, a partition 7 is disposed inside the box body 1, and the first crushing device and the second crushing device are respectively located at two sides of the partition 7; the arrangement of the partition plates 7 enables the first crushing device and the second crushing device to operate separately, mutual interference during crushing is avoided, and the effect of crushed stone is further improved.
In another embodiment, referring to fig. 1, the screening device comprises a screen plate 15, wherein one end of the screen plate 15 is inclined downwards, and the end of the screen plate 15 inclined downwards is connected with a conveying device; the arrangement of the screen plate 15 plays a good role in screening stones, wherein the inclined arrangement of the screen plate 15 facilitates the crushed stones to flow into the conveying device.
In another embodiment, please refer to fig. 2, two ends of the mesh plate 15 are provided with connecting blocks 16, the inner wall of the box body 1 is provided with a groove 17, and the connecting blocks 16 are located inside the groove 17 and movably connected with the groove 17 through springs 18; the arrangement of the springs 18 plays a role in buffering the screen plate 15, on one hand, the flow of stones on the screen plate 15 is promoted, and on the other hand, the protection function is provided for the screen plate 15, so that the damage to the screen plate 15 caused by stones splashed onto the screen plate 15 is prevented.
In another embodiment, referring to fig. 1, a drainage plate 2 is arranged below the mesh plate 15, one end of the drainage plate 2, which is far away from the conveying device, is inclined downwards, one end of the drainage plate 2, which is inclined downwards, and a discharge port 3 is arranged on the side wall of the box body 1; be favorable to the rubble to flow through being provided with of 2 slopes of drainage plate, improved the discharging efficiency of rubble.
In another embodiment, referring to fig. 1, the conveying device includes a conveying pipe 14, a rotating rod 11 is disposed inside the conveying pipe 14, a spiral propelling blade 12 is disposed on the rotating rod 11, the rotating rod 11 is fixedly connected to an output end of a first motor 10, a channel 9 is disposed on a side wall of the conveying pipe 14, the channel 9 is connected to the box body 1, and an outlet of the channel 9 is located right above the second stone breaking device; drive dwang 11 through first motor 10 and rotate, and then drive helical propulsion blade 12 and rotate, helical propulsion blade 12 set up the effect of having played a transport to the rubble, can carry out continuous stable transport to the rubble.
In another embodiment, referring to fig. 1, an inclined plate 13 is arranged below the second stone breaking device, one end of the inclined plate 13, which is far away from the conveying device, is inclined downwards and is positioned right below the partition plate 7, and the other end of the inclined plate 13 is fixedly connected with the inner wall of the box body 1; the setting of swash plate 13 has a guide effect to the rubble, has abundant time when making the rubble enter into sieving mechanism's inside and screens it, has guaranteed the effect of screening.
In another embodiment, please refer to fig. 1 and 3, the first stone breaking device includes two first rotating rollers 4 distributed oppositely, the second stone breaking device includes two second rotating rollers 8 distributed oppositely, the first rotating rollers 4 and the second rotating rollers 8 are both provided with breaking teeth 5, and the first rotating rollers 4 and the second rotating rollers 8 both penetrate through the side wall of the box body 1 and are connected with a driving device outside the box body 1; drive first live-rollers 4 and second live-rollers 8 through the drive and rotate, the setting of broken tooth 5 on first live-rollers 4 and the second live-rollers 8 has played a crushing effect to the stone, and crushing efficiency is higher.
In another embodiment, referring to fig. 3, the driving device includes a second motor 24, a first gear 19, a second gear 20, a third gear 21 and a third gear 21, an output end of the second motor 24 is fixedly connected to the second rotating roller 8, the number of the first gears 19 is two and is respectively fixedly connected to the two first rotating rollers 4, the first gears 19 are engaged with each other, the number of the second gears 20 is two and is respectively fixedly connected to the two second rotating rollers 8, the second gears 20 are engaged with each other, the third gear 21 is fixedly connected to one of the first rotating rollers 4, the fourth gear 22 is fixedly connected to one of the second rotating rollers 8, and the third gear 21 is connected to the fourth gear 22 through a chain 23; drive second live-rollers 8 through second motor 24 and rotate, second live-rollers 8 drives first live-rollers 4 through fourth gear 22, chain 23 and third gear 21 and rotates, and then drives first rubble device and second rubble device operation, and two have been guaranteed in setting up of first gear 19 simultaneously first live-rollers 4's rotation opposite direction, two have been guaranteed in setting up of second gear 20 second live-rollers 8's rotation opposite direction, and then guaranteed the crushing effect to the stone.
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 (10)
1. A stone breaking device for mining comprises a box body; the crushing device is characterized in that a first stone crushing device and a second stone crushing device are arranged inside the box body, the first stone crushing device is used for primary crushing of stones, and the second stone crushing device is used for secondary crushing of the stones; the inside of box still is equipped with the sieving mechanism, the sieving mechanism is used for screening the stone after the breakage, the sieving mechanism is connected with conveyor, conveyor is used for transmitting the stone that is not broken, makes its inside that enters into the box once more carry out the secondary crushing.
2. A rock breaking apparatus for mining as claimed in claim 1, wherein a feed hopper is provided at the top of the casing, the feed hopper being located directly above the first breaking means.
3. A rock breaking apparatus for mining as claimed in claim 1, wherein a partition is provided in the body, the first and second breaking means being located on either side of the partition.
4. A rock breaking apparatus for mining as claimed in claim 1, wherein the screening means includes a screen plate, one end of the screen plate is inclined downwardly, and the end of the screen plate inclined downwardly is connected to the conveying means.
5. A rock breaking device for mining as claimed in claim 4, wherein the net plate is provided with connecting blocks at both ends thereof, the inner wall of the box body is provided with a groove, and the connecting blocks are located inside the groove and movably connected with the groove through springs.
6. The stone crushing device for mining according to claim 4, wherein a drainage plate is arranged below the screen plate, one end of the drainage plate, which is far away from the conveying device, is inclined downwards, and a discharge hole is formed in one end of the drainage plate, which is inclined downwards, and the side wall of the box body.
7. The stone breaking device for mining of claim 1, wherein the conveying device comprises a conveying pipe, a rotating rod is arranged inside the conveying pipe, a spiral propelling blade is arranged on the rotating rod, the rotating rod is fixedly connected with the output end of the first motor, a channel is arranged on the side wall of the conveying pipe and connected with the box body, and the outlet of the channel is positioned right above the second stone breaking device.
8. A rock breaking device for mining as claimed in claim 3, wherein an inclined plate is arranged below the second rock breaking device, one end of the inclined plate, which is far away from the conveying device, is inclined downwards and is positioned right below the partition plate, and the other end of the inclined plate is fixedly connected with the inner wall of the box body.
9. The mining stone breaking device as claimed in claim 1, wherein the first stone breaking device comprises two first rotating rollers which are distributed oppositely, the second stone breaking device comprises two second rotating rollers which are distributed oppositely, the first rotating rollers and the second rotating rollers are provided with breaking teeth, and the first rotating rollers and the second rotating rollers penetrate through the side wall of the box body and are connected with a driving device outside the box body.
10. The mining stone breaking device as claimed in claim 9, wherein the driving device comprises a second motor, first gears, second gears, third gears and third gears, the output end of the second motor is fixedly connected with the second rotating rollers, the number of the first gears is two, the first gears are respectively and fixedly connected with the two first rotating rollers, the first gears are mutually meshed, the number of the second gears is two, the second gears are respectively and fixedly connected with the two second rotating rollers, the second gears are mutually meshed, the third gears are fixedly connected with one of the first rotating rollers, the fourth gears are fixedly connected with one of the second rotating rollers, and the third gears and the fourth gears are connected through chains.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210244983.8A CN114700139A (en) | 2022-03-14 | 2022-03-14 | Stone crushing device for mining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210244983.8A CN114700139A (en) | 2022-03-14 | 2022-03-14 | Stone crushing device for mining |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114700139A true CN114700139A (en) | 2022-07-05 |
Family
ID=82169644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210244983.8A Pending CN114700139A (en) | 2022-03-14 | 2022-03-14 | Stone crushing device for mining |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114700139A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110681434A (en) * | 2019-10-15 | 2020-01-14 | 枣庄鑫金山智能机械股份有限公司 | Circulation system sand machine |
| CN210875724U (en) * | 2019-08-21 | 2020-06-30 | 醴陵市精陶瓷业有限公司 | Waste material collecting device that industrial ceramics processing used |
| CN212820120U (en) * | 2019-12-27 | 2021-03-30 | 潍坊市信得生物科技有限公司 | Chain type vertical crusher for organic fertilizer production |
| CN214159779U (en) * | 2020-11-10 | 2021-09-10 | 青岛瑞莱斯重工有限公司 | Mine building stones crushing and screening device |
| CN215087542U (en) * | 2021-05-31 | 2021-12-10 | 东华理工大学长江学院 | Civil engineering construction waste treatment device |
| CN215694256U (en) * | 2021-01-21 | 2022-02-01 | 内蒙古磐宏建设工程有限责任公司 | Mine ore crusher |
-
2022
- 2022-03-14 CN CN202210244983.8A patent/CN114700139A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210875724U (en) * | 2019-08-21 | 2020-06-30 | 醴陵市精陶瓷业有限公司 | Waste material collecting device that industrial ceramics processing used |
| CN110681434A (en) * | 2019-10-15 | 2020-01-14 | 枣庄鑫金山智能机械股份有限公司 | Circulation system sand machine |
| CN212820120U (en) * | 2019-12-27 | 2021-03-30 | 潍坊市信得生物科技有限公司 | Chain type vertical crusher for organic fertilizer production |
| CN214159779U (en) * | 2020-11-10 | 2021-09-10 | 青岛瑞莱斯重工有限公司 | Mine building stones crushing and screening device |
| CN215694256U (en) * | 2021-01-21 | 2022-02-01 | 内蒙古磐宏建设工程有限责任公司 | Mine ore crusher |
| CN215087542U (en) * | 2021-05-31 | 2021-12-10 | 东华理工大学长江学院 | Civil engineering construction waste treatment device |
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Application publication date: 20220705 |