CN220677726U - Fine powder recovery system suitable for airtight dry method granulator - Google Patents
Fine powder recovery system suitable for airtight dry method granulator Download PDFInfo
- Publication number
- CN220677726U CN220677726U CN202322350592.7U CN202322350592U CN220677726U CN 220677726 U CN220677726 U CN 220677726U CN 202322350592 U CN202322350592 U CN 202322350592U CN 220677726 U CN220677726 U CN 220677726U
- Authority
- CN
- China
- Prior art keywords
- fine powder
- feed inlet
- dry
- finished product
- outlet
- 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.)
- Active
Links
- 239000000843 powder Substances 0.000 title claims abstract description 53
- 238000011084 recovery Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 63
- 239000008187 granular material Substances 0.000 claims abstract description 36
- 239000002245 particle Substances 0.000 claims abstract description 33
- 238000012216 screening Methods 0.000 claims abstract description 22
- 238000004140 cleaning Methods 0.000 claims description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000000428 dust Substances 0.000 claims description 10
- 239000008213 purified water Substances 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 5
- 238000004064 recycling Methods 0.000 claims 4
- 239000011236 particulate material Substances 0.000 claims 1
- 238000012546 transfer Methods 0.000 abstract description 7
- 238000007599 discharging Methods 0.000 abstract description 4
- 238000007908 dry granulation Methods 0.000 abstract description 2
- 206010073310 Occupational exposures Diseases 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 239000008202 granule composition Substances 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 231100000675 occupational exposure Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Landscapes
- Glanulating (AREA)
Abstract
The utility model discloses a fine powder recovery system suitable for a closed dry granulator, which relates to the technical field of dry granulation and comprises a support frame and a lifting machine, wherein the lifting machine is connected with a material barrel; the upper end of the dry granulating machine is provided with a Y-shaped feeding hopper, the Y-shaped feeding hopper comprises a first feeding port and a second feeding port, and the first feeding port is detachably connected with a discharging port of a material barrel; the screening machine is fixedly arranged on the supporting frame, a feed inlet of the screening machine is connected with a discharge outlet of the dry-method granulator through a material conveying assembly, and a fine powder outlet, a large particle material outlet and a finished product particle material outlet are arranged on the screening machine and are communicated with the second feed inlet; the feed inlet of the finished product granule collecting barrel is communicated with the finished product granule material outlet. Above-mentioned a fine powder recovery system suitable for airtight dry granulator realizes the automatic transfer of unqualified fine powder granule, improves transfer efficiency, and satisfies OEB4 airtight requirement in this application unqualified fine powder granule transfer process.
Description
Technical Field
The utility model relates to the technical field of dry granulation, in particular to a fine powder recovery system suitable for a closed dry granulator.
Background
The granule mixture produced by the dry granulator is separated into three granules after being screened by a screening machine: one is qualified particles with mesh number range meeting the requirement; one is to require large particles outside the maximum mesh size range; in addition, fine powder particles outside the minimum mesh size range are required, and because of the relatively large proportion of unacceptable fine powder particles, these fine powder particles are often re-added to a dry granulator for re-granulation by manual transportation.
At present, the fine powder particles cannot meet the sealing requirement in the process of adding the fine powder particles into a dry granulator, and further the fine powder particles are exposed to the air, so that the granulating requirements of the high-activity, high-toxicity and Gao Zhimin medicaments cannot be met.
Therefore, how to provide a fine powder recovery system suitable for a closed dry granulator to realize automatic transfer of fine powder particles and in a closed state is a technical problem that needs to be solved by those skilled in the art at present.
Disclosure of Invention
The utility model aims to provide a fine powder recovery system suitable for a closed dry granulator, which solves the problem that the transfer of fine powder in a closed state cannot be realized.
In order to achieve the above object, the present utility model provides a fine powder recovery system suitable for a closed dry granulator, comprising a support frame, and further comprising:
the lifting machine is arranged on the ground and is connected with the material barrel;
the dry granulating machine is placed on the ground, the upper end of the dry granulating machine is provided with a Y-shaped feeding hopper, the Y-shaped feeding hopper comprises a first feeding port and a second feeding port, and the first feeding port is detachably connected with a discharging port of the material barrel;
the screening machine is fixedly arranged on the support frame, the screening machine is positioned above the dry-method granulator, a feed inlet of the screening machine is connected with a discharge outlet of the dry-method granulator through a material conveying assembly, a fine powder outlet, a large particle material outlet and a finished product particle material outlet are formed in the screening machine, and the fine powder outlet and the large particle material outlet are communicated with the second feed inlet;
the finished product granule collecting vessel, the finished product granule collecting vessel is located ground, the feed inlet of finished product granule collecting vessel with finished product granule material export intercommunication.
Preferably, the material transportation assembly comprises a vacuum discharger, a vacuum feeder and a feeding pipe, wherein the vacuum discharger is communicated and connected with a discharge port of the dry granulator, the vacuum discharger is communicated and connected with the vacuum feeder through the feeding pipe, and the screening machine is communicated and connected with the discharge port of the vacuum feeder.
Preferably, the material bucket through first split type butterfly valve with first feed inlet intercommunication is connected, the finished product granule material export through first unloading pipe and second split type butterfly valve with the feed inlet intercommunication of finished product granule collecting vat is connected.
Preferably, the fine powder outlet and the large particle material outlet are communicated and connected with the second feeding port through a second discharging pipe.
Preferably, the device further comprises a dust removal component, wherein the dust removal component is communicated and connected with the upper end of the dry granulator so as to realize a micro negative pressure state in the cavity of the dry granulator.
Preferably, the dust removal assembly comprises a primary filter, the primary filter is connected with the dry granulator in a communicating way through a first pipeline, the primary filter is connected with a middle-stage filter and a high-stage filter in a communicating way through a second pipeline, and the high-stage filter is connected with the exhaust fan in a communicating way through a third pipeline.
Preferably, the device further comprises a cleaning assembly, wherein the cleaning assembly comprises a cleaning body, and a compressed air interface, a purified water interface and a cleaning pipeline are arranged on the cleaning body so as to realize online cleaning of residual materials in the fine powder recovery system.
Compared with the background art, the fine powder recovery system suitable for the closed dry granulator provided by the utility model has the advantages that after the lifting machine lifts the material bucket to the designated position, the material bucket is correspondingly communicated and connected with the first feed inlet, the dry granulator is further used for granulating, the granular materials prepared by the dry granulator are transferred to the sieving machine through the conveying component, and the sieving machine is provided with the fine powder outlet, the large granular material outlet and the finished product granular material outlet which are communicated with the second feed inlet, so that the unqualified fine powder particles and the large granular materials reenter the dry granulator for re-granulating, and the finished product particles enter the finished product particle collecting bucket.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a fine powder recovery system suitable for a closed dry granulator according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of a fine powder recovery system suitable for a closed dry granulator according to an embodiment of the present utility model.
Wherein:
1-supporting frames, 2-lifting machines, 3-material barrels, 4-dry-method granulator, 5-Y-type feed hopper, 6-screening machine, 7-finished product particle collecting barrels, 8-primary filters and 9-cleaning bodies;
31-a first split butterfly valve, 32-a first blanking pipe and 33-a second split butterfly valve;
41-vacuum discharger, 42-vacuum feeder and 43-feeding pipe;
51-a first feed inlet and 52-a second feed inlet;
61-a fine powder outlet, 62-a large particle material outlet and 63-a finished particle material outlet;
81-a first pipeline, 82-a second pipeline, 83-a middle-stage filter, 84-a high-stage filter, 85-a third pipeline and 86-an exhaust fan;
91-compressed air interface, 92-purified water interface, 93-cleaning pipeline.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The present utility model will be further described in detail below with reference to the drawings and detailed description for the purpose of enabling those skilled in the art to better understand the aspects of the present utility model.
Referring to fig. 1-2, the fine powder recovery system suitable for a closed dry granulator provided by the application comprises a support frame 1 and a lifter 2, wherein the lifter 2 is installed on the ground, the lifter 2 is connected with a material barrel 3, and the lifter 2 can further realize that the material barrel 3 moves in the vertical direction; the dry granulator 4 is placed on the ground, a Y-shaped feed hopper 5 is arranged at the upper end of the dry granulator 4, the Y-shaped feed hopper 5 comprises a first feed inlet 51 and a second feed inlet 52, the first feed inlet 51 and the second feed inlet 52 are communicated with the dry granulator 4, and the first feed inlet 51 is detachably connected with a discharge port of the material barrel 3; the screening machine 6 is fixedly arranged on the support frame 1, the screening machine 6 is positioned above the dry-method granulator 4, a feed inlet of the screening machine 6 is connected with a discharge outlet of the dry-method granulator 4 through a material conveying assembly, a fine powder outlet 61, a large particle material outlet 62 and a finished product particle material outlet 63 are arranged on the screening machine 6, and the fine powder outlet 61 and the large particle material outlet 62 are both communicated with the second feed inlet 52; the finished product particle collecting barrel 7 is arranged on the ground, the finished product particle collecting barrel 7 is arranged below the sieving machine 6, and a feed inlet of the finished product particle collecting barrel 7 is communicated with the finished product particle material outlet 63.
Through the application provided a be applicable to airtight dry granulator's fine powder recovery system, after lifting machine 2 promotes material bucket 3 and reaches the assigned position, make the discharge gate and the first feed inlet 51 of material bucket 3 correspond the intercommunication and be connected, and then dry granulator 4 pelletizes, the granule material that dry granulator 4 preparation obtained shifts to screening machine 6 through transportation subassembly, because screening machine 6 is provided with fine powder export 61, big granule material export 62 and finished product granule material export 63, and fine powder export 61 and big granule material export 62 all communicate with second feed inlet 52, therefore, unqualified fine powder granule and big granule reentrant dry granulator 4 are pelleting again, finished product granule enters into in the finished product granule collecting vat 7, through this application a fine powder recovery system suitable for airtight dry granulator, realize the automatic transfer of unqualified fine powder granule, improve transportation efficiency, and improve granule material's utilization ratio, and this application satisfies OEB4 (Occupational Exposure Band-occupational exposure level) airtight requirement in the unqualified fine powder granule transfer process, prevent that toxic materials from leaking, harm personnel's life safety.
On the basis of the above-mentioned embodiment, the lifting machine 2 that this application used is prior art's direct use, satisfies the lifting unit of vertical direction and all can regard as this application lifting machine 2, and this application lifting machine 2 can select for slider lifting unit, and slider lifting unit's tip is provided with the clamp, and this clamp is used for the fixed material bucket of centre gripping, and this application lifting machine 2 still can select for electric hoist.
On the basis of the embodiment, the material transporting assembly comprises a vacuum discharger 41, a vacuum feeder 42 and a feeding pipe 43, wherein the vacuum discharger 41 is communicated and connected with a discharge port of the dry granulator 4, the vacuum discharger 41 and the vacuum feeder 42 are communicated and connected through the feeding pipe 43, and the screening machine 6 is communicated and connected with a discharge port of the vacuum feeder 42.
That is, the vacuum discharger 41 and the vacuum feeder 42 provided by the application are all direct use of the prior art, so the application does not redundant description on the specific structures of the vacuum discharger 41 and the vacuum feeder 42, and the vacuum discharger 41, the vacuum feeder 42 and the feeding pipe 43 are matched for use, so that the granule materials prepared by the dry granulating machine 4 are efficiently completed and transferred into the sieving machine 6.
Specifically, vacuum discharger 41 is provided with the air inlet, and the air inlet is provided with pneumatic butterfly valve, and when vacuum discharger 41 during operation, the air inlet is opened, realizes vacuum discharger 41 ejection of compact, and when vacuum discharger 41 during non-operation, pneumatic butterfly valve realizes that the air inlet closes, avoids the air inlet to contact with the external world, prevents that the fine powder granule material from revealing.
On the basis of the embodiment, the material bucket 3 is connected with the first feeding port 51 through the first split butterfly valve 31, and the finished product granule material outlet 63 is connected with the feeding port of the finished product granule collecting bucket 7 through the first blanking pipe 32 and the second split butterfly valve 33.
Specifically, the first split butterfly valve 31 and the second split butterfly valve 33 are both αβ valves, and are composed of active valves and passive valves, and are used for discharging under closed conditions, and the first split butterfly valve 31 and the second split butterfly valve 33 are both directly used in the prior art, so that specific structures of the first split butterfly valve 31 and the second split butterfly valve 33 are not described in detail.
Alternatively, the first split butterfly valve 31 is an automatic αβ valve and the second split butterfly valve 33 is a manual αβ valve.
On the basis of the above embodiment, the fine powder outlet 61 and the large particle material outlet 62 are connected in communication with the second feed inlet 52 through the second discharge pipe.
On the basis of the above embodiment, a fine powder recovery system suitable for a closed dry granulator further includes a dust removal component, where the dust removal component is connected with the upper end of the dry granulator 4 in a communicating manner, so as to achieve a micro negative pressure state in the cavity of the dry granulator 4, and further prevent the material flow in the cavity of the dry granulator 4 from leaking to the outside under the action of the negative pressure, the dust removal component includes a primary filter 8, where the primary filter 8 is connected with the dry granulator 4 in a communicating manner through a first pipe 81, and where the primary filter 8 is connected with a middle-stage filter 83 and a high-stage filter 84 in a communicating manner through a second pipe 82, and where the high-stage filter 84 is connected with an exhaust fan 86 in a communicating manner through a third pipe 85.
That is, the first pipe 81 is connected to the dry granulator 4 through the present application, the primary filter 8 is connected to the intermediate filter 83 and the high-grade filter 84 through the second pipe 82, and the high-grade filter 84 is connected to the exhaust fan 86 through the third pipe 85, so that the exhaust fan 86 discharges the gas in the cavity of the dry granulator 4 to generate micro negative pressure. The dust removal component is used for filtering the gas pumped by the exhaust fan 86, and through the arrangement of the primary filter 8, the intermediate filter 83 and the advanced filter 84, the fine powder particle materials in the gas are prevented from contacting with the external air, so that the environment is prevented from being damaged.
On the basis of the above embodiment, a fine powder recovery system suitable for a closed dry granulator further comprises a cleaning assembly, wherein the cleaning assembly comprises a cleaning body 9, and a compressed air interface 91, a purified water interface 92 and a cleaning pipeline 93 are arranged on the cleaning body 9 so as to realize on-line cleaning of residual materials in the fine powder recovery system.
That is, the cleaning body 9 of the present application is provided with a compressed air port 91 and a purified water port 92, and the compressed air port 91 is used for connecting an air pipe, and the purified water port 92 is used for connecting a high-pressure water pipe; and one end of the cleaning pipeline 93 is communicated with the cleaning body 9, and the other end is communicated with the dry granulator 4, the feed pipe 43, the screening machine 6, the Y-shaped feed hopper 5, the vacuum feeder 42, the first blanking pipe 32 and the first split butterfly valve 31, when the material of the material barrel 3 is replaced, the cleaning pipeline is connected with a water pipe through the purified water interface 92, the cleaning body 9 is provided with a booster pump for pressurizing the cleaning water, so that the high-pressure water enters the cleaning pipeline 93, the cleaning of the materials positioned in the dry granulator 4, the feed pipe 43, the screening machine 6, the Y-shaped feed hopper 5, the vacuum feeder 42, the first blanking pipe 32 and the first split butterfly valve 31 is realized, and because the other end of the vacuum discharger 41 is provided with a water outlet, and the first blanking pipe 32 is provided with a drain cup, and then realizes the discharge of cleaning water, after the cleaning is completed, the high-pressure water flow is stopped to be conveyed into the cleaning pipeline 93, and in order to avoid residual moisture, the compressed air interface 91 is used for connecting an air pipeline, and the cleaning pipeline 93 is used for conveying high-pressure air, the residual moisture is blown away through the high-pressure air, in particular, the drain port is provided with a manual butterfly valve, when the cleaning assembly is in a working state, the manual butterfly valve is opened, and then the drain port is in an open state, and when the cleaning assembly is in an unused state, the manual butterfly valve is closed, and then the drain port is in a closed state, in particular, in order to clean, the granulator is disassembled during maintenance, and then manual cleaning is performed.
It should be noted that in this specification relational terms such as first and second are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present utility model and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.
Claims (7)
1. The utility model provides a fine powder recovery system suitable for airtight dry granulator, includes support frame (1), its characterized in that still includes:
the lifting machine (2) is arranged on the ground, and the lifting machine (2) is connected with the material barrel (3);
the dry granulating machine (4), the dry granulating machine (4) is placed on the ground, a Y-shaped feed hopper (5) is arranged at the upper end of the dry granulating machine (4), the Y-shaped feed hopper (5) comprises a first feed inlet (51) and a second feed inlet (52), and the first feed inlet (51) is detachably connected with a discharge port of the material barrel (3);
the screening machine (6) is fixedly arranged on the supporting frame (1), a feed inlet of the screening machine (6) is connected with a discharge outlet of the dry-method granulator (4) through a material conveying assembly, a fine powder outlet (61), a large particle material outlet (62) and a finished product particle material outlet (63) are arranged on the screening machine (6), and the fine powder outlet (61) and the large particle material outlet (62) are both communicated with the second feed inlet (52);
finished product granule collecting vessel (7), finished product granule collecting vessel (7) are located ground, the feed inlet of finished product granule collecting vessel (7) with finished product granule material export (63) intercommunication.
2. The fine powder recycling system suitable for a closed dry granulator according to claim 1, wherein the material transporting assembly comprises a vacuum discharger (41), a vacuum feeder (42) and a feeding pipe (43), the vacuum discharger (41) is communicated and connected with a discharge port of the dry granulator (4), the vacuum discharger (41) and the vacuum feeder (42) are communicated and connected through the feeding pipe (43), and the sieving machine (6) is communicated and connected with a discharge port of the vacuum feeder (42).
3. The fine powder recycling system suitable for a closed dry granulator according to claim 1, wherein the material barrel (3) is connected with the first feed inlet (51) through a first split butterfly valve (31), and the finished product granule material outlet (63) is connected with the feed inlet of the finished product granule collecting barrel (7) through a first blanking pipe (32) and a second split butterfly valve (33).
4. The fines recovery system adapted for a closed dry granulator according to claim 1, wherein the fines outlet (61) and the large particulate material outlet (62) are connected in communication with the second feed inlet (52) via a second feed down pipe.
5. The fine powder recovery system suitable for a closed dry granulator according to claim 1, further comprising a dust removal assembly, wherein the dust removal assembly is connected with the upper end of the dry granulator (4) in a communicating manner, so as to achieve a micro negative pressure state in the cavity of the dry granulator (4).
6. The fines recovery system suitable for a closed dry granulator according to claim 5, wherein the dust removal assembly comprises a primary filter (8), the primary filter (8) being in communication with the dry granulator (4) through a first conduit (81), the primary filter (8) being in communication with a middle stage filter (83) and a high stage filter (84) through a second conduit (82), the high stage filter (84) being in communication with an exhaust fan (86) through a third conduit (85).
7. The fine powder recycling system suitable for the closed dry granulator according to claim 1, further comprising a cleaning assembly, wherein the cleaning assembly comprises a cleaning body (9), and a compressed air interface (91), a purified water interface (92) and a cleaning pipeline (93) are arranged on the cleaning body so as to realize online cleaning of residual materials in the fine powder recycling system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322350592.7U CN220677726U (en) | 2023-08-31 | 2023-08-31 | Fine powder recovery system suitable for airtight dry method granulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322350592.7U CN220677726U (en) | 2023-08-31 | 2023-08-31 | Fine powder recovery system suitable for airtight dry method granulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220677726U true CN220677726U (en) | 2024-03-29 |
Family
ID=90376297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322350592.7U Active CN220677726U (en) | 2023-08-31 | 2023-08-31 | Fine powder recovery system suitable for airtight dry method granulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220677726U (en) |
-
2023
- 2023-08-31 CN CN202322350592.7U patent/CN220677726U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109080141B (en) | Increasing material manufacturing integration ancillary equipment, working method and screening, collecting equipment | |
| CN207872676U (en) | A kind of plastic grain hierarchy system | |
| CN220677726U (en) | Fine powder recovery system suitable for airtight dry method granulator | |
| CN208103365U (en) | A kind of vacuum feeder | |
| CN212496720U (en) | Waste recycling structure for slot machine production | |
| CN211160152U (en) | High-efficient powder grading plant | |
| CN108097364A (en) | A kind of novel concrete industrial roll press cycle closed-circuit system of application specific fine powder separation equipment | |
| CN211768922U (en) | Pneumatic powder conveying and discharging mechanism | |
| CN214553317U (en) | Fine powder recovery system | |
| CN217247190U (en) | Four-way filter for three-phase shunt | |
| CN208050023U (en) | A kind of novel concrete industrial roll press cycle closed-circuit system of application specific fine powder separation equipment | |
| CN215783913U (en) | Full-automatic powder material loading granule finishing device | |
| CN219631238U (en) | Discharging circulation system for dry granulation | |
| CN207290629U (en) | Filter bypass device | |
| CN210533522U (en) | Clean material weighing device | |
| CN205238650U (en) | Full -automatic high speed tablet press subassembly | |
| CN219194892U (en) | Water-coal-slurry grading device | |
| CN211707340U (en) | Notch cuttype screening plant fast | |
| CN219167803U (en) | Dust collecting and recycling system | |
| CN215140219U (en) | Pipe chain conveying system of flour mill | |
| CN218423295U (en) | Circulating feeding device of powder coating grinding machine | |
| CN212442037U (en) | Salt processing is with high-efficient screening plant | |
| CN213294011U (en) | Multipoint feeding system capable of realizing online screening and vacuum conveying | |
| CN219442506U (en) | Airtight grading system | |
| CN219582599U (en) | Shot blasting material screening device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |