CN112892860A - Iron removing device - Google Patents
Iron removing device Download PDFInfo
- Publication number
- CN112892860A CN112892860A CN202110056228.2A CN202110056228A CN112892860A CN 112892860 A CN112892860 A CN 112892860A CN 202110056228 A CN202110056228 A CN 202110056228A CN 112892860 A CN112892860 A CN 112892860A
- Authority
- CN
- China
- Prior art keywords
- magnet
- chute
- iron removal
- opening
- removal device
- 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.)
- Pending
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 47
- 238000007789 sealing Methods 0.000 claims abstract description 22
- 239000000428 dust Substances 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 19
- 230000007246 mechanism Effects 0.000 claims description 18
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 abstract description 14
- 239000002184 metal Substances 0.000 abstract description 13
- 229910052751 metal Inorganic materials 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 8
- 238000009826 distribution Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 241000406668 Loxodonta cyclotis Species 0.000 description 6
- 230000003028 elevating effect Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/16—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts
- B03C1/22—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with non-movable magnets
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the field of machine-made sandstone production equipment, and discloses an iron removal device, wherein the iron removal device comprises a chute (10) and a magnet unit (20), an opening is formed in the upward surface of a pipe body of the chute (10), and the magnet unit (20) comprises a magnet (21) which hermetically extends into the chute (10) from the opening. The material is conveyed through the chute, the sealing performance is better than that of a belt conveyor, and the magnet hermetically extends into the chute from the opening, so that the sealing conveying performance of the chute can be maintained. Because the material can form loose distribution state in the process of slipping in the chute, and the position of metal impurities in the material flow depth of the material can be changed, the metal impurities can be more easily adsorbed by the magnet, and the iron removal effect and efficiency are improved.
Description
Technical Field
The invention relates to the field of machine-made sandstone production equipment, in particular to an iron removal device.
Background
In the production of machine-made sandstone, the used aggregate needs to be subjected to iron removal treatment so as to avoid the damage of metal impurities to equipment. In the prior art, a magnet is usually arranged above a certain section of a belt conveyor to adsorb metal impurities in materials conveyed by the belt conveyor below the belt conveyor. Because the belt feeder is open transport, the easy raise dust, the feature of environmental protection is relatively poor. In addition, because the material is in quiescent condition on the belt feeder, metallic impurity probably is in the deeper position of material, can't be adsorbed effectively because of the resistance is great, leads to the deironing effect poor for the material needs to be through many times deironing processing.
Disclosure of Invention
The invention aims to solve the problems of poor iron removal effect and environmental protection in the prior art and provide an iron removal device with better iron removal effect and environmental protection.
In order to achieve the above object, an aspect of the present invention provides an iron removing apparatus, wherein the iron removing apparatus includes a chute having an opening formed on an upward surface of a pipe body thereof, and a magnet unit including a magnet hermetically protruding from the opening into the chute.
Optionally, the magnet unit comprises a frame body surrounding the opening of the chute and connected with the chute in a seamless manner, and the magnet is arranged in an area surrounded by the frame body in a sealing manner.
Optionally, the frame body comprises a tail end extending towards the outside of the chute, and the tail end is provided with a sealing ring in sealing fit with the magnet.
Optionally, an annular pressure plate is fixed to the tail end of the frame body, and the seal ring is clamped between the pressure plate and the tail end.
Optionally, an access door capable of being opened and closed and used for accessing the magnet is arranged on the frame body.
Optionally, a dust removal port located at the upstream of the opening along the material flow direction of the chute is arranged on the pipe body of the chute, and the iron removal device comprises a dust removal unit for removing dust through the dust removal port.
Optionally, the iron removal device includes a lifting mechanism for adjusting the depth of the magnet extending into the opening.
Optionally, the iron removal device includes a control unit for controlling the lifting mechanism and a detection unit installed on the magnet, the detection unit is used for detecting a distance between the magnet and a material flow surface of the material in the chute, and the control unit is electrically connected with the detection unit to control the lifting mechanism according to feedback of the detection unit.
Optionally, the control unit is configured to control the lifting mechanism according to an average value L of n times of results of the distance detected within a predetermined time by the detection unit, where n is a natural number greater than or equal to 2.
Optionally, the control unit is configured to control the lifting mechanism to adjust the position of the magnet when the deviation of the average value L from a predetermined ideal distance value L0 is greater than a preset deviation, so that the deviation of the distance of the magnet from the material flow surface from the ideal distance value L0 is not greater than the preset deviation.
Through above-mentioned technical scheme, carry the material through the elephant trunk, compare the belt feeder and have better leakproofness, magnet stretches into in the elephant trunk from the opening sealedly, can keep the sealed transportability of elephant trunk. Because the material can form loose distribution state in the process of slipping in the chute, and the position of metal impurities in the material flow depth of the material can be changed, the metal impurities can be more easily adsorbed by the magnet, and the iron removal effect and efficiency are improved.
Drawings
FIG. 1 is a schematic structural view of one embodiment of an iron removal device of the present application;
fig. 2 is a view from a in fig. 1 in the direction of the outlined arrow.
Description of the reference numerals
10-a chute, 11-a dust removal opening, 20-an iron removal unit, 21-a magnet, 211-a body, 212-a hook part, 22-a frame body, 221-an access door, 23-a sealing ring, 24-a pressing plate, 30-a lifting mechanism, 31-a hook, 32-a connecting piece, 33-a screw rod, 34-a nut, 35-a motor, 36-a support, 40-a control unit and 50-a detection unit.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, the use of directional terms such as "upper, lower, left, right" generally means upper, lower, left, right as viewed with reference to the accompanying drawings, unless otherwise specified; "inner and outer" refer to the inner and outer relative to the profile of the components themselves. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The application provides an deironing device, wherein, deironing device includes elephant trunk 10 and magnet unit 20, be provided with the opening on the upward surface of the body of elephant trunk 10, magnet unit 20 is including following sealedly the opening stretches into magnet 21 in the elephant trunk 10.
The chute 10 is used for conveying materials, the sealing performance is better than that of a belt conveyor, and the magnet 21 hermetically extends into the chute 10 from the opening, so that the sealing conveying performance of the chute 10 can be maintained. Since the materials can form a loose distribution state in the process of slipping in the chute 10 and the position of the metal impurities in the material flow depth of the materials can be changed, the metal impurities can be more easily adsorbed by the magnet 21, thereby improving the iron removal effect and efficiency.
Specifically, the materials can form a loose distribution state in the process of sliding in the chute 10, even if the metal impurities are located at a deeper position of the material flow when passing through the magnet 21, because the materials above are in the loose distribution state, the resistance met by the suction force of the magnet 21 is obviously reduced compared with the condition of the materials conveyed by the belt conveyor, and the suction force of the magnet 21 can overcome the gravity of the materials above to suck the metal impurities out. In addition, the material is in a dynamic state in the sliding process in the chute 10 and the position of the material flow in the thickness direction changes, that is, the material on the surface layer may sink in the sliding process, and the material on the lower layer may float in the sliding process, so that the metal impurities are located at the upper part of the thickness of the material flow when passing through the magnet 21, and thus the metal impurities can be easily adsorbed by the magnet 21. In addition, more iron removal devices can be continuously arranged, so that a better iron removal effect is achieved.
Wherein the openings are provided on the upwardly facing surface of the pipe body, i.e. the outer surface of the part of the chute 10 not in contact with the flow, including the part visible from above the chute 10 in plan view and the upper half of the part viewed from the side of the chute 10.
The magnet 21 may sealingly protrude into the opening in various suitable ways. For example, a seal may be provided at the edge of the opening that sealingly engages the magnet 21. For maintenance, preferably, as shown in fig. 1, the magnet unit 20 comprises a frame 22 surrounding the opening of the chute 10 and connected to the chute seamlessly, and the magnet 21 is arranged hermetically in the area enclosed by the frame 22. Thus, the sealing of the magnet 21 and the housing 22 can indirectly achieve the sealing of the opening.
To seal the magnet 21 and the housing 22, the outer periphery of the magnet 21 and the inner periphery of the housing 22 may be arranged to match each other so that the magnet 21 is in close contact with the housing 22. In addition, to enhance the sealing performance, the frame 22 may include a tip extending to the outside of the chute 10, and the tip is provided with a sealing ring 23 which is in sealing engagement with the magnet 21. Thus, a closed space facing the inside of the chute 10 can be formed by the packing 23, the magnet 21, the frame 22 and the inner wall of the chute 10, and the magnet 21 can be installed while maintaining good sealing performance in the chute 10. In order to fix the sealing ring 23, an annular pressing plate 24 is fixed to the end of the frame 22, and the sealing ring 23 is interposed between the pressing plate 24 and the end.
In addition, in order to clean the metal impurities adsorbed by the magnet 21 and to facilitate maintenance, an access door 221 for accessing the magnet 21 may be provided on the housing 22 to be opened and closed. The access door 221 remains closed during normal use of the iron removal apparatus to maintain the tightness inside the chute 10, and is opened only when maintenance or cleaning is required, in order to access the inside of the chute 10 from the outside. The installation position of the access door 221 may be selected as needed, and the insertion of the interference magnet 21 should be avoided as much as possible. In the embodiment shown in fig. 1, the opening may extend from one side of the chute 10 to the other side through the upper surface of the chute 10, the frame 22 comprises a body fixed along the edge of the opening and a cover portion extending from the body, the cover portion being capable of covering the opening except for the portion corresponding to the upper surface of the chute 10, the magnet 21 extending from the portion of the opening not covered by the cover portion, and the access door 221 may be opened on the cover portion, for example, at the position on both sides of the chute 10 as shown.
In addition, the material may generate dust during the process of sliding in the chute 10, in order to remove the dust, as shown in fig. 1 and fig. 2, a dust removing opening 11 located upstream of the opening in the material flow direction of the chute 10 is provided on the body of the chute 10, and the iron removing device includes a dust removing unit for removing dust through the dust removing opening 11. When the dust removal device is used, the dust removal unit (such as a draught fan) can suck the raised dust generated by the material slipping through the dust removal port 11.
It will be appreciated by those skilled in the art that the closer the magnets 21 are to the surface of the material flow, the better the adsorption, but too close may affect the material sliding in the chute 10. The throughput of the apparatus etc. may also be such that the material flow thickness in the chute 10 varies. To this end, the iron removal device comprises a lifting mechanism 30 for adjusting the depth of the magnet 21 projecting into the opening. Through elevating system 30, can adjust the magnet 21 and stretch into the degree of depth in the opening to adapt to the change of material flow thickness and ensure better adsorption effect. It is understood that, in order to ensure the sealing property between the magnet 21 and the frame 22, the height of the magnet 21 and the lifting range thereof may be set so that the magnet 21 can be in sealing contact with the sealing ring 23 at all times within the movement range thereof.
Specifically, the magnet 21 may include a plate-shaped body 211 and a first engaging structure (e.g., a hook 212) disposed on a top surface of the body 211, and the lifting mechanism 30 may include a lifting unit and a second engaging structure (e.g., a hook 31) connected to the lifting unit, where the first engaging structure is engaged with the second engaging structure to drive the second engaging structure via the lifting unit, and then drive the second engaging structure and the body 211 to lift. In order to stably lift and lower the magnet 21, the first engaging structure may include a plurality of hooks 212, and the corresponding second engaging structure may include a plurality of hooks 31. A plurality of hooks 31 may be coupled to the coupling member 32, and the coupling member 32 is coupled to the lifting unit to simultaneously lift the plurality of hooks 31 by the lifting unit.
The lifting unit may take any suitable form, and may be a telescopic cylinder, for example. For the sake of simplifying the structure, as shown in fig. 1, the lifting unit may include a screw 33 and a motor 35 for driving the screw 33 to rotate, the screw 33 is axially limited, the connecting member 32 may be formed in a boom form, the boom may be welded with a nut 34 capable of cooperating with the screw 33, and the nut 34 and the screw 33 form a screw-nut mechanism. The screw 33 is driven to rotate by the motor 35, so that the nut 34 drives the connecting piece 32 to ascend and descend along the screw 33. Wherein, a bracket 36 can be arranged on the outer surface of the chute 10, and the components such as the motor 35 can be arranged on the bracket 36.
As described above, the depth of penetration of the magnet 21 can be adjusted depending on whether the distance between the magnet 21 and the surface of the flow is appropriate. To this end, the iron removing apparatus may include a control unit 40 for controlling the elevating mechanism 30 and a detecting unit 50 installed on the magnet 21, the detecting unit 50 for detecting a distance between the magnet 21 and a material flow surface of the material in the chute 10, the control unit 40 being electrically connected to the detecting unit 50 to control the elevating mechanism 30 according to feedback of the detecting unit 50.
Specifically, the control unit 40 may be configured such that the distance between the magnet 21 and the surface of the flow of material is maintained within a predetermined range. Thus, when the actually detected distance exceeds the predetermined range, the magnet 21 is correspondingly controlled to move up and down according to the feedback of the detection unit 50, so that the distance between the magnet 21 and the surface of the material flow is adjusted to be within the predetermined range.
To avoid the fact that a single detection cannot sufficiently reflect the distance between the current magnet 21 and the surface of the material flow, the control unit 40 is configured to control the lifting mechanism 30 according to an average value L of n times of results of the detection of the distance within a predetermined time by the detection unit 50, where n is a natural number greater than 2. Specifically, the detection may be performed at predetermined time intervals by the detection unit 50 within a predetermined time to obtain n times of detection results L1, … … ln, by calculating L ═ L1+ … … ln)/n.
In use, when L exceeds the predetermined range, the magnet 21 is correspondingly controlled to be lifted and lowered so that the distance between the magnet 21 and the surface of the material flow is adjusted to be within the predetermined range (i.e. so that L obtained after adjustment is within the predetermined range). Specifically, the control unit 40 is configured to control the lifting mechanism 30 to adjust the position of the magnet 21 when the deviation of the average value L from a predetermined ideal distance value L0 is greater than a preset deviation, so that the deviation of the distance of the magnet 21 from the material flow surface from the ideal distance value L0 is not greater than the preset deviation. That is, it may be determined whether L is out of the predetermined range according to whether the absolute value of the difference between the average value L and the ideal distance value L0 is greater than a preset deviation. The ideal distance value L0 and the preset deviation can be set according to the type of material flow, the conveying amount, the speed, and the like.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention. The present application includes the combination of individual features in any suitable manner. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (10)
1. The iron removal device is characterized by comprising a chute (10) and a magnet unit (20), wherein an opening is formed in the upward surface of a pipe body of the chute (10), and the magnet unit (20) comprises a magnet (21) which stretches into the chute (10) from the opening in a sealing mode.
2. The iron removal device according to claim 1, characterized in that the magnet unit (20) comprises a frame (22) surrounding the opening of the chute (10) and connected thereto seamlessly, the magnet (21) being sealingly arranged in the area enclosed by the frame (22).
3. The iron removal device according to claim 2, characterized in that the frame (22) comprises a tip extending towards the outside of the chute (10), said tip being provided with a sealing ring (23) in sealing engagement with the magnet (21).
4. The iron removal device according to claim 3, characterized in that an annular pressure plate (24) is fixed to the end of the frame (22), and the seal ring (23) is interposed between the pressure plate (24) and the end.
5. The iron removal device according to claim 2, wherein an access door (221) for accessing the magnet (21) is provided on the frame (22) so as to be openable and closable.
6. The iron removal device according to claim 1, characterized in that the body of the chute (10) is provided with a dust removal opening (11) upstream of the opening in the direction of flow of the chute (10), the iron removal device comprising a dust removal unit for removing dust via the dust removal opening (11).
7. The iron removal device according to any one of claims 1 to 6, characterized in that it comprises a lifting mechanism (30) for adjusting the depth of the magnet (21) projecting into the opening.
8. The iron removal device according to claim 7, characterized in that it comprises a control unit (40) for controlling the lifting mechanism (30) and a detection unit (50) mounted on the magnet (21), the detection unit (50) being adapted to detect the distance between the magnet (21) and the surface of the material flow in the chute (10), the control unit (40) being electrically connected to the detection unit (50) for controlling the lifting mechanism (30) according to the feedback of the detection unit (50).
9. The iron removal apparatus according to claim 8, characterized in that the control unit (40) is arranged to control the lifting mechanism (30) according to an average value L of n results of the detection of the distance detected within a predetermined time by the detection unit (50), where n is a natural number of 2 or more.
10. The iron removal plant according to claim 9, characterized in that the control unit (40) is arranged to control the lifting mechanism (30) to adjust the position of the magnet (21) when the deviation of the mean value L from a predetermined ideal distance value L0 is greater than a preset deviation, so that the deviation of the distance of the magnet (21) from the surface of the material flow from the ideal distance value L0 is not greater than the preset deviation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110056228.2A CN112892860A (en) | 2021-01-15 | 2021-01-15 | Iron removing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110056228.2A CN112892860A (en) | 2021-01-15 | 2021-01-15 | Iron removing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112892860A true CN112892860A (en) | 2021-06-04 |
Family
ID=76113751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110056228.2A Pending CN112892860A (en) | 2021-01-15 | 2021-01-15 | Iron removing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112892860A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2048921C1 (en) * | 1991-07-12 | 1995-11-27 | Северо-Кавказский горно-металлургический институт | Apparatus for concentrating finely divided strongly magnetic ores |
| CN2626613Y (en) * | 2003-06-08 | 2004-07-21 | 戴丽达 | Ducting type permanent magnet automatic iron remover |
| JP2005118729A (en) * | 2003-10-20 | 2005-05-12 | Seirei Ind Co Ltd | Grain shaking sorter |
| CN103826751A (en) * | 2011-09-27 | 2014-05-28 | 西门子公司 | Magnetic separator, method for operation thereof and use thereof |
| CN104070014A (en) * | 2014-06-07 | 2014-10-01 | 江苏泰达纺织有限公司 | Impurity removing device provided with bridge type magnet |
| CN104307629A (en) * | 2014-10-21 | 2015-01-28 | 上海烟草集团有限责任公司 | Automatic electromagnetic impurity removing machine for cigarette |
| CN204796708U (en) * | 2015-07-24 | 2015-11-25 | 四川零关科技有限公司 | Prickly ash stoving magnetic separator de -ironing |
| CN205684189U (en) * | 2016-06-20 | 2016-11-16 | 河南西超实业有限公司 | Magnetic separator for system pipeline clear at the beginning of flour mill's Semen Tritici aestivi |
| CN205833361U (en) * | 2016-06-13 | 2016-12-28 | 镇江市鸿兴磁选设备有限公司 | Chute tramp iron separator |
| CN207357622U (en) * | 2017-10-24 | 2018-05-15 | 增城市优质米生产基地公司 | A kind of chute for apparatus of selecting rice color |
| CN210522614U (en) * | 2019-06-26 | 2020-05-15 | 郑州科技学院 | Civil engineering construction waste treatment device |
-
2021
- 2021-01-15 CN CN202110056228.2A patent/CN112892860A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2048921C1 (en) * | 1991-07-12 | 1995-11-27 | Северо-Кавказский горно-металлургический институт | Apparatus for concentrating finely divided strongly magnetic ores |
| CN2626613Y (en) * | 2003-06-08 | 2004-07-21 | 戴丽达 | Ducting type permanent magnet automatic iron remover |
| JP2005118729A (en) * | 2003-10-20 | 2005-05-12 | Seirei Ind Co Ltd | Grain shaking sorter |
| CN103826751A (en) * | 2011-09-27 | 2014-05-28 | 西门子公司 | Magnetic separator, method for operation thereof and use thereof |
| CN104070014A (en) * | 2014-06-07 | 2014-10-01 | 江苏泰达纺织有限公司 | Impurity removing device provided with bridge type magnet |
| CN104307629A (en) * | 2014-10-21 | 2015-01-28 | 上海烟草集团有限责任公司 | Automatic electromagnetic impurity removing machine for cigarette |
| CN204796708U (en) * | 2015-07-24 | 2015-11-25 | 四川零关科技有限公司 | Prickly ash stoving magnetic separator de -ironing |
| CN205833361U (en) * | 2016-06-13 | 2016-12-28 | 镇江市鸿兴磁选设备有限公司 | Chute tramp iron separator |
| CN205684189U (en) * | 2016-06-20 | 2016-11-16 | 河南西超实业有限公司 | Magnetic separator for system pipeline clear at the beginning of flour mill's Semen Tritici aestivi |
| CN207357622U (en) * | 2017-10-24 | 2018-05-15 | 增城市优质米生产基地公司 | A kind of chute for apparatus of selecting rice color |
| CN210522614U (en) * | 2019-06-26 | 2020-05-15 | 郑州科技学院 | Civil engineering construction waste treatment device |
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Application publication date: 20210604 |