CN113333163A - Method for separating iron sand or iron ore - Google Patents
Method for separating iron sand or iron ore Download PDFInfo
- Publication number
- CN113333163A CN113333163A CN202110617808.4A CN202110617808A CN113333163A CN 113333163 A CN113333163 A CN 113333163A CN 202110617808 A CN202110617808 A CN 202110617808A CN 113333163 A CN113333163 A CN 113333163A
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- Prior art keywords
- sand
- iron
- iron ore
- wheel
- separating
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 272
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 136
- 239000004576 sand Substances 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 57
- 238000002156 mixing Methods 0.000 claims abstract description 34
- 239000004575 stone Substances 0.000 claims abstract description 32
- 238000000926 separation method Methods 0.000 claims abstract description 17
- 238000012544 monitoring process Methods 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 9
- 238000001179 sorption measurement Methods 0.000 claims description 6
- 238000011068 loading method Methods 0.000 claims description 4
- 230000005389 magnetism Effects 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 230000032258 transport Effects 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 82
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- B03C1/18—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with magnets moving during operation
Abstract
The invention provides a method for separating iron sand or iron ore, which is based on the existing concrete mixing plant.A system for separating iron sand or iron ore is arranged on an aggregate conveying device of the existing concrete mixing plant, and the conveying device comprises a driving wheel, a driven wheel and a conveying belt; magnetizing a driven wheel of a sand and stone material conveying device in an existing mixing station to enable the driven wheel to become a magnetic wheel capable of adsorbing iron sand or iron ore; a storage box and/or a lower conveyor belt are arranged on one side of the magnetic wheel and are used for receiving the separated sand and stone materials; and a collecting bin is arranged below the existing conveying belt and used for collecting iron sand or iron ore falling from the magnetic wheel. The invention has the advantages of simple structure, convenient separation, low energy consumption, environmental protection, high efficiency and great economic value, and can effectively solve the problems of high energy consumption, great pollution, more mechanical equipment needing to be configured, inconvenience in installation, environment damage and influence on river flood discharge safety of the traditional dredger.
Description
Technical Field
The invention belongs to the technical field of separation devices, and particularly relates to a method for separating iron sand or iron ore.
Background
Sand and stone materials such as machine-made sand, river sand, sea sand, and the like are indispensable building materials which are widely used, however, iron sand contained in these sand and stone materials is rarely extracted and utilized. At present, there are only a few cases of extracting iron sand from river sand, because the iron sand is directly used for collecting yellow sand, and the yellow sand is collected from rivers, lakes and reservoirs by means of sand digging boats. However, the collected yellow sand is often doped with more iron sand, the iron sand needs to be separated and extracted from the yellow sand, the traditional iron sand extraction equipment is too large in size and inconvenient to install on a sand dredger, meanwhile, different equipment needs to be installed for feeding, drying and separating the gravel in the extraction process, the labor intensity and the equipment use cost are greatly increased, and the energy consumption is high; secondly, at present, under the background of advocating green environmental protection, the environmental protection problem is more and more emphasized, and traditional sand mining separation ship is because the energy consumption is high, the polluted environment, destroys the riverbed structure, influences river levee safety, and on this basis, it is necessary to improve to the drawback of traditional mode.
Disclosure of Invention
In order to solve the problems in the prior art as described above, a method of separating iron sand or iron ore is provided.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a system for separating iron sand or iron ore based on a concrete mixing plant, wherein the concrete mixing plant is provided with a conveying device for conveying sand and stone materials, the conveying device comprises a conveying belt, and the conveying belt is used for receiving and conveying sand and stone materials; the two ends of the conveying belt are respectively connected with a driving wheel and a driven wheel; the driving wheel is connected with a driving motor; the driven wheel is a magnetic wheel, and the magnetic wheel is used for adsorbing iron sand or iron ore in sand materials to complete separation; a material storage box and/or a lower conveyor belt for bearing the separated sand and stone materials are arranged on one side of the magnetic wheel; conveying the separated sand and stone materials into a stirrer and mixing into a concrete wet material; the below of conveyer belt still is provided with collects the storehouse, collects the storehouse and is used for collecting the iron sand or the iron ore that drop from the magnetism wheel.
Optionally, the collection bin is provided with a second valve, and the second valve is an electromagnetic valve or a pneumatic valve.
Optionally, the bottom of the collecting bin is connected with a lifting device for lifting materials.
Optionally, the lifting device is a packing auger or a winch.
Optionally, a level sensor is arranged in the collection bin.
Optionally, the system further comprises a remote monitoring system, wherein the remote monitoring system comprises a controller, and the controller is respectively electrically connected with the second valve, the lifting device and the material level sensor and controls the second valve, the lifting device and the material level sensor; the controller is also connected with an upper computer through a wireless communication module to realize remote monitoring.
Optionally, a permanent magnet playing an auxiliary adsorption role is arranged in an annular space formed by the conveyor belt, and the permanent magnet is arranged at a position close to the magnetic wheel.
Optionally, a scraper is connected to the top of the collection bin, and the top of the scraper is in contact connection with the conveyor belt.
The invention also provides a method for separating iron sand or iron ore, which comprises the following steps:
the method comprises the following steps: the system for separating iron sand or iron ore is arranged on at least one existing concrete mixing station sand-gravel material conveying device by depending on the existing concrete mixing station, and the conveying device comprises a driving wheel, a driven wheel and a conveying belt; the device is specifically arranged to magnetize a driven wheel of a sand and stone material conveying device in the existing mixing plant, so that the driven wheel becomes a magnetic wheel capable of adsorbing iron sand or iron ore; a material storage box is arranged on one side of the magnetic wheel and is used for receiving the separated sand and stone materials; a collecting bin is arranged below the existing conveying belt and used for collecting iron sand or iron ore falling from the magnetic wheel;
step two: the sand and stone raw materials are conveyed forwards through the conveying device, when the sand and stone raw materials are conveyed to the position of the magnetic wheel, iron sand or iron ore contained in the sand and stone raw materials are adsorbed by the magnetic wheel, and the rest sand and stone raw materials cannot be adsorbed and are conveyed into the stirring machine to be mixed into concrete wet materials; the adsorbed iron sand or iron ore is conveyed to the upper part of the collecting bin along with the rotation of the magnetic wheel, and the adsorption force borne by the adsorbed and conveyed iron sand or iron ore is smaller and smaller along with the rotation of the magnetic wheel until the iron sand or iron ore falls into the collecting bin to be stored, so that the separation of the iron sand or iron ore is completed.
The system also comprises remote monitoring, wherein a material level sensor in a collection bin acquires the material level condition of the storage bin in real time and transmits data to a controller in real time, and the controller receives the data and then remotely transmits the data to an upper computer through a wireless communication module so as to facilitate the real-time monitoring of workers; when reaching the full state in storehouse in collecting the storehouse, staff's accessible host computer remote control controls the second valve and opens and hoisting device, promotes the material and transports, makes things convenient for the loading.
Compared with the prior art, the invention has the following advantages:
1. the invention relies on the existing concrete mixing plant, a system for separating iron sand or iron ore can be arranged at the front ends of sand stone conveying lines of a plurality of existing concrete mixing plants, the separation of iron sand or iron ore can be realized during the conveying of sand stones in the concrete mixing plants, the structure needing to be configured is simple, the iron sand or iron ore can be quickly separated on the premise of not influencing the production of concrete, the structure is simple, the separation is convenient, the energy consumption is low, the environment protection and the efficiency are high, the investment cost is low, the great economic value is realized, and the problems that the traditional sand digging ship is high in energy consumption, large in pollution, more mechanical equipment needing to be configured is inconvenient to install, the environment is damaged, and the safety of river flood discharge can be effectively solved.
2. The system for separating iron sand or iron ore quickly realizes the separation of iron sand and iron ore by adopting a magnetic wheel method, and has simple structure and low cost; meanwhile, the system can be remotely monitored, and a plurality of separation systems can be conveniently monitored and counted.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural view (with a storage bin) of an embodiment of the present invention.
FIG. 2 is a schematic structural view of an embodiment of the present invention (without the storage bin).
Fig. 3 is a schematic structural diagram of the second embodiment of the present invention.
Description of reference numerals:
1, a driving wheel; 2, a magnetic wheel; 3, conveying a belt; 4, feeding a material bin; 5, a material storage box; 6, collecting a bin; 7, a packing auger; 8 a permanent magnet; a 9 level sensor; 10 a first valve; 11 a second valve; 12 a controller; 13 a wireless communication module; 14, an upper computer; 15 a lower conveyer belt; and 16 scraper blades.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Example one
As shown in fig. 1 and 2, the present embodiment proposes a system for separating iron sand or iron ore based on a concrete mixing plant, the concrete mixing plant is provided with a conveyer for conveying sand material, the conveyer comprises a conveyer belt 3, the conveyer belt 3 is used for receiving and conveying sand material; the two ends of the conveyor belt 3 are respectively connected with a driving wheel 1 and a driven wheel; the driving wheel 1 is connected with a driving motor; a feeding bin 4 is arranged above the conveying device, the feeding bin 4 is a device of a concrete production line of a mixing plant, a first valve 10 is arranged at the bottom of the feeding bin 4, and the first valve 10 is an electromagnetic valve or a pneumatic valve; the driven wheel is a magnetic wheel 2, and the magnetic wheel 2 is used for adsorbing iron sand or iron ore in sand and stone materials to complete separation; a storage box 5 and/or a lower conveyor belt 15 for bearing the separated sand and stone materials are arranged on one side of the magnetic wheel 2, and the storage box 5 and/or the lower conveyor belt 15 are original devices in the mixing station and do not need to be additionally arranged; the sand and stone materials in the storage box 5 are conveyed into a stirrer and mixed into concrete wet materials; a collecting bin 6 is further arranged below the conveyor belt 3, and the collecting bin 6 is used for collecting iron sand or iron ore falling from the magnetic wheels 2. In this embodiment, the aggregate material in the storage bin 5 is conveyed to the mixer by the lower conveyor 15 and mixed into a concrete wet material.
For the convenience of control, the collecting bin 6 is provided with a second valve 11, and the second valve 11 is an electromagnetic valve or a pneumatic valve;
in order to facilitate loading, the bottom of the collecting bin 6 is connected with a lifting device for lifting materials; the lifting device can adopt an auger 7, and the auger 7 is driven by a motor of the auger 7; the lifting device can also adopt a direct lifting mode, such as a winch or other conventional mechanisms can also directly lift the collecting bin 6, and the specific mode can select a proper mode according to the actual working environment in the mixing station.
In order to monitor the material level in the bin, a material level sensor 9 is arranged in the collection bin 6, so that the bin level condition can be monitored in real time.
The system further comprises a remote monitoring system, wherein the remote monitoring system comprises a controller 12, and the controller 12 is respectively electrically connected with the second valve 11, the lifting device and the material level sensor 9 and controls the second valve, the lifting device and the material level sensor; the controller 12 is also connected with an upper computer 14 through a wireless communication module to realize remote monitoring.
The wireless communication module 13 includes but is not limited to wireless communication networks such as WIFI, 4G, bluetooth, etc.
Example two
As shown in fig. 3, on the basis of the first embodiment, a permanent magnet 8 for assisting the adsorption is disposed in the annular space formed by the conveyor belt 3, and the permanent magnet 8 is disposed at a position close to the magnetic wheel 2.
The top of the collecting bin 6 is connected with a scraper 16, and the top of the scraper 16 is in contact connection with the conveyor belt 3. Once iron ore or iron sand remains on the conveyor belt, the scraping of the material can be realized through the scraper 16, and the iron sand or the iron ore is ensured to fall into the collecting bin 6 completely.
The invention also provides a method for separating iron sand or iron ore, which comprises the following steps:
the method comprises the following steps: the system for separating iron sand or iron ore is arranged on at least one existing concrete mixing station sand-gravel material conveying device by depending on the existing concrete mixing station, and the conveying device comprises a driving wheel 1, a driven wheel and a conveying belt 3; the device is specifically arranged to magnetize a driven wheel of a sand and stone material conveying device in the existing mixing plant, so that the driven wheel becomes a magnetic wheel 2 capable of adsorbing iron sand or iron ore; a material storage box 5 is arranged on one side of the magnetic wheel 2 and is used for receiving the separated sand and stone materials; a collecting bin 6 is arranged below the existing conveyor belt 3 and used for collecting iron sand or iron ore falling from the magnetic wheel 2;
step two: the sandstone raw materials are conveyed forwards through the conveying device, when the sandstone raw materials are conveyed to the position of the magnetic wheel 2, iron sand or iron ore contained in the sandstone raw materials are adsorbed by the magnetic wheel 2, and the rest sandstone raw materials cannot be adsorbed and are conveyed into the stirrer to be mixed into concrete wet materials; the adsorbed iron sand or iron ore is conveyed to the upper part of the collecting bin 6 along with the rotation of the magnetic wheel 2, the adsorption force of the adsorbed and conveyed iron sand or iron ore is smaller and smaller along with the rotation of the magnetic wheel 2, and the iron sand or iron ore is scraped to the collecting bin 6 under the action of gravity or by a scraper 16 to be stored, so that the separation of the iron sand or iron ore is completed.
The system also comprises remote monitoring, wherein a material level sensor 9 in a collection bin 6 collects the material level condition of the bin in real time and transmits data to a controller 12 in real time, and the controller 12 receives the data and then remotely transmits the data to an upper computer 14 through a wireless communication module so as to facilitate the real-time monitoring of working personnel; when the full state of the collection bin 6 is achieved, a worker can remotely control the upper computer 14 to control the second valve 11 to open and lift the device, so that the materials are lifted and transported, and loading is facilitated.
The invention relies on the existing concrete mixing plant, a system for separating iron sand or iron ore can be arranged at the front end of a plurality of sand stone conveying lines of the existing concrete mixing plant, the separation of the iron sand or the iron ore can be realized during the conveying of sand stones in the concrete mixing plant, the structure needing to be configured is simple, the iron sand or the iron ore can be quickly separated on the premise of not influencing the production of concrete, the structure is simple, the separation is convenient, the energy consumption is low, the environment protection and the high efficiency are realized, the investment cost is low, the great economic value is realized, and the problems that the traditional sand digging ship has high energy consumption, large pollution, more mechanical equipment needing to be configured is inconvenient to install, the structure of a riverbed is damaged, and the safety of a riverbank is influenced can be effectively solved.
The system for separating iron sand or iron ore of the invention adopts the method of the magnetic wheel 2 to rapidly realize the separation of the iron sand and the iron ore, and has simple structure and low cost; meanwhile, the system can be remotely monitored, and a plurality of separation systems can be conveniently monitored and counted.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A system for separating iron sand or iron ore based on a concrete mixing plant is provided with a conveying device for conveying sand and stone materials, wherein the conveying device comprises a conveying belt, and the conveying belt is used for receiving and conveying sand and stone materials; the two ends of the conveying belt are respectively connected with a driving wheel and a driven wheel; the driving wheel is connected with a driving motor; the magnetic driven wheel is characterized in that the driven wheel is a magnetic wheel, and the magnetic wheel is used for adsorbing iron sand or iron ore in sand and stone materials to complete separation; the below of conveyer belt still is provided with collects the storehouse, collects the storehouse and is used for collecting the iron sand or the iron ore that drop from the magnetism wheel.
2. The system for separating iron sand or iron ore based on concrete mixing plant according to claim 1, characterized in that the collection bin is provided with a second valve, and the second valve is a solenoid valve or a pneumatic valve.
3. The system for separating iron sand or iron ore according to claim 2, wherein a lifting device for lifting materials is connected to the bottom of the collecting bin.
4. The system for separating iron sand or iron ore based on the concrete mixing plant according to claim 3, wherein the lifting device is a screw conveyor or a winch.
5. The system for separating iron sand or iron ore based on the concrete mixing plant according to claim 2, wherein a material level sensor is arranged in the collection bin.
6. The system for separating iron sand or iron ore based on the concrete mixing plant according to claim 4, characterized by further comprising a remote monitoring system, wherein the remote monitoring system comprises a controller, and the controller is electrically connected with the second valve, the lifting device and the level sensor respectively and performs control; the controller is also connected with an upper computer through a wireless communication module to realize remote monitoring.
7. The system for separating iron sand or iron ore based on the concrete mixing plant as claimed in claim 1, wherein the annular space formed by the conveyor belt is internally provided with a permanent magnet for auxiliary adsorption, and the permanent magnet is arranged at a position close to the magnetic wheel.
8. The system for separating iron sand or iron ore based on the concrete mixing plant as claimed in claim 5, wherein a scraper is connected to the top of the collection bin, and the top of the scraper is in contact connection with the conveyor belt.
9. A method for separating iron sand or iron ore, which is characterized in that the system for separating iron sand or iron ore based on a concrete mixing plant, which is disclosed by any one of claims 1 to 8, is adopted, and comprises the following steps:
the method comprises the following steps: depending on the existing concrete mixing plant, a system for separating iron sand or iron ore is arranged on at least one sand and stone material conveying device of the existing concrete mixing plant, and the conveying device comprises a driving wheel, a driven wheel and a conveying belt; the device is specifically arranged to magnetize a driven wheel of a sand and stone material conveying device in the existing mixing plant, so that the driven wheel becomes a magnetic wheel capable of adsorbing iron sand or iron ore; a collecting bin is arranged below the existing conveying belt and used for collecting iron sand or iron ore falling from the magnetic wheel;
step two: the sand and stone raw materials are conveyed forwards through the conveying device, when the sand and stone raw materials are conveyed to the position of the magnetic wheel, iron sand or iron ore contained in the sand and stone raw materials are adsorbed by the magnetic wheel, and the rest sand and stone raw materials cannot be adsorbed and are conveyed into the stirring machine to be mixed into concrete wet materials; the adsorbed iron sand or iron ore is conveyed to the upper part of the collecting bin along with the rotation of the magnetic wheel, and the adsorption force borne by the adsorbed and conveyed iron sand or iron ore is smaller and smaller along with the rotation of the magnetic wheel until the iron sand or iron ore falls into the collecting bin to be stored, so that the separation of the iron sand or iron ore is completed.
10. The method for separating iron sand or iron ore according to claim 9, further comprising remote monitoring, wherein a material level sensor in the collection bin collects the material level condition of the storage bin in real time and transmits the data to the controller in real time, and the controller receives the data and transmits the data to the upper computer in a remote mode through the wireless communication module so that a worker can monitor the data in real time; when reaching the full state in storehouse in collecting the storehouse, staff's accessible host computer remote control controls the second valve and opens and hoisting device, promotes the material and transports, makes things convenient for the loading.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110617808.4A CN113333163A (en) | 2021-06-03 | 2021-06-03 | Method for separating iron sand or iron ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110617808.4A CN113333163A (en) | 2021-06-03 | 2021-06-03 | Method for separating iron sand or iron ore |
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| Publication Number | Publication Date |
|---|---|
| CN113333163A true CN113333163A (en) | 2021-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110617808.4A Pending CN113333163A (en) | 2021-06-03 | 2021-06-03 | Method for separating iron sand or iron ore |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114029834A (en) * | 2021-11-22 | 2022-02-11 | 欧科达 | Stainless steel dinner plate polishing and grinding equipment for catering |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206464075U (en) * | 2017-01-09 | 2017-09-05 | 湖北凤山矿业有限公司 | A kind of iron ore dry-type magnetic extractor |
| CN109317301A (en) * | 2018-11-14 | 2019-02-12 | 王光领 | A kind of air dry sand Recognition Applied in Coal Preparation System |
| CN209020460U (en) * | 2018-09-11 | 2019-06-25 | 江苏省地质勘查技术院 | A kind of ore concentration equipment |
| CN211937385U (en) * | 2019-12-30 | 2020-11-17 | 湖北省华建石材股份有限公司 | Magnet separator for iron ore |
-
2021
- 2021-06-03 CN CN202110617808.4A patent/CN113333163A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206464075U (en) * | 2017-01-09 | 2017-09-05 | 湖北凤山矿业有限公司 | A kind of iron ore dry-type magnetic extractor |
| CN209020460U (en) * | 2018-09-11 | 2019-06-25 | 江苏省地质勘查技术院 | A kind of ore concentration equipment |
| CN109317301A (en) * | 2018-11-14 | 2019-02-12 | 王光领 | A kind of air dry sand Recognition Applied in Coal Preparation System |
| CN211937385U (en) * | 2019-12-30 | 2020-11-17 | 湖北省华建石材股份有限公司 | Magnet separator for iron ore |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114029834A (en) * | 2021-11-22 | 2022-02-11 | 欧科达 | Stainless steel dinner plate polishing and grinding equipment for catering |
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Application publication date: 20210903 |