CN219923205U - Superfine grinding equipment for lithium iron phosphate raw materials - Google Patents
Superfine grinding equipment for lithium iron phosphate raw materials Download PDFInfo
- Publication number
- CN219923205U CN219923205U CN202320896127.0U CN202320896127U CN219923205U CN 219923205 U CN219923205 U CN 219923205U CN 202320896127 U CN202320896127 U CN 202320896127U CN 219923205 U CN219923205 U CN 219923205U
- Authority
- CN
- China
- Prior art keywords
- grinding
- box body
- iron phosphate
- lithium iron
- filter screen
- 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
- 238000000227 grinding Methods 0.000 title claims abstract description 99
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 title claims abstract description 52
- 239000002994 raw material Substances 0.000 title claims abstract description 39
- 230000007246 mechanism Effects 0.000 claims abstract description 24
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 18
- 238000007599 discharging Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 19
- 230000008569 process Effects 0.000 description 17
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 10
- 235000017491 Bambusa tulda Nutrition 0.000 description 10
- 241001330002 Bambuseae Species 0.000 description 10
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 10
- 239000011425 bamboo Substances 0.000 description 10
- 244000309464 bull Species 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000012216 screening Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000005526 G1 to G0 transition Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Crushing And Grinding (AREA)
Abstract
The utility model relates to the technical field of lithium iron phosphate production, in particular to superfine grinding equipment for lithium iron phosphate raw materials, which comprises a box body, wherein a feeding mechanism is arranged at the side of the box body, a grinding mechanism and a filtering mechanism are sequentially arranged in the box body from top to bottom, a grinding cylinder is fixedly arranged at the top position of the box body inner cavity, an annular support is arranged below the grinding cylinder, the outer wall of the annular support is fixedly connected with the inner wall of the box body, a same vertically arranged rotating rod is respectively arranged between the grinding cylinder and the annular support through bearings, and a grinding disc is annularly arranged at the outer side of the rotating rod.
Description
Technical Field
The utility model relates to the technical field of lithium iron phosphate production, in particular to superfine grinding equipment for lithium iron phosphate raw materials.
Background
The lithium iron phosphate material has the advantages of long cycle life, safety performance, low cost, high temperature stability, abundant resources and the like, and becomes a preferred positive electrode material of a lithium ion power battery, in particular to the high safety characteristic of the lithium iron phosphate material; the production process of the lithium iron phosphate comprises a mixing process, a drying process, a sintering process, a grading packaging process and a qualified finished product warehousing detection process, wherein during mixing, raw materials are weighed according to a certain proportion, uniformly mixed, taken out and ground, so that solid particles in the raw materials are ground to reach a required granularity range;
the utility model has disclosed the utility model of Chinese patent application No. CN202020116086.5 has been disclosed a lithium iron phosphate high-efficient grinding equipment uses the circulation grinding mechanism, including U-shaped frame, U-shaped frame bottom middle part and grind the second telescopic link upper end activity that the inner bottom middle part set up in both sides of the case, U-shaped frame inside one end middle section has push plates through the third telescopic link activity connection, and U-shaped frame inside another end has baffles through the telescopic spring connection, grind the case to set up in the middle of U-shaped frame inboard, and grind the lower extreme in the middle part of the front surface of the case and run through and connect with the mounting frame, the upper portion middle section has baffles through the articulated shaft activity connection in the mounting frame;
the above comparative document has the following problems:
(1) When the existing grinding device is used, the traditional grinding mode is simple, the size of the grinding materials is different, the final finished product effect is poor, the using effect is affected, and the efficient grinding process of the lithium iron phosphate cannot be carried out.
(2) Before the grinding process, the lithium iron phosphate raw material is manually conveyed and thrown into a feed inlet at the top of the grinding box, so that the requirement on manpower is high, and the feeding efficiency is low.
Disclosure of Invention
The utility model aims to provide superfine grinding equipment for lithium iron phosphate raw materials, so as to solve the problems in the background technology.
The technical scheme of the utility model is as follows: the utility model provides a superfine grinding equipment of lithium iron phosphate raw materials, includes the box, the side of box is equipped with feed mechanism, box inner chamber is equipped with grinding mechanism and filter mechanism from last extremely down in proper order, grinding mechanism includes grinding cylinder, bull stick, servo motor, first filter screen, ring support, grinding disc, grinding shaft, tooth piece one and tooth piece two, the top position fixed mounting of box inner chamber has the grinding cylinder, the below of grinding cylinder is equipped with the ring support, the outer wall of ring support and the inner wall fixed connection of box, install the bull stick of same vertical setting through the bearing respectively between grinding cylinder and the ring support, servo motor is installed to the top position of box, the output of servo motor and the tip key fixed connection of bull stick, the grinding disc is installed to the outside annular of bull stick, the first filter screen is installed to the bottom position of grinding cylinder, the mounting groove that supplies the bull stick to run through has been seted up to the intermediate position of first filter screen, the bull stick outside fixed connection between grinding cylinder and the ring support has a set up grinding shaft, two on the grinding shaft fixed connection tooth piece one is two the tooth piece two, two sets up a plurality of tooth pieces and two relative tooth pieces are all installed to tooth piece.
Further, filtering mechanism includes locating piece, second filter screen, connecting seat and electric putter, the inner wall fixedly connected with of box a set of locating piece and the connecting seat that symmetry set up, two the spout has all been seted up to one side that the locating piece is relative, two sliding fit has same second filter screen between the spout, two the equal fixedly connected with electric putter in top of connecting seat, two electric putter keeps away from one side of connecting seat and is connected with the bottom side stationary phase of second filter screen respectively.
Further, feed mechanism includes screw conveyer, unloading section of thick bamboo and pan feeding section of thick bamboo, the side of pan feeding section of thick bamboo is equipped with screw conveyer, discharge gate one has been seted up to the bottom of pan feeding section of thick bamboo, discharge gate one is linked together with screw conveyer's pan feeding end, screw conveyer's discharge end intercommunication has an unloading section of thick bamboo, the one end that the unloading section of thick bamboo extends to box inner chamber is linked together with the grinding vessel.
Further, a guide plate which is obliquely arranged is arranged in the blanking cylinder.
Further, a second discharge port is formed in the bottom end of the box body, and a material collecting box is arranged below the second discharge port.
Further, the aperture of the second filter screen is smaller than that of the first filter screen.
Compared with the prior art, the utility model provides the superfine grinding equipment for the lithium iron phosphate raw material, which has the following improvements and advantages:
the method comprises the following steps: the utility model realizes the procedures of secondary grinding and secondary filtering without affecting the grinding efficiency, greatly improves the grinding efficiency and accuracy of the lithium iron phosphate raw material, and is beneficial to efficiently producing high-quality lithium iron phosphate grinding powder.
And two,: according to the utility model, by arranging the feeding mechanism, the lithium iron phosphate raw material is thrown into the feeding cylinder and then falls into the grinding cylinder through the discharging cylinder under the transmission of the screw conveyor, so that an automatic feeding process is realized, the feeding efficiency of the lithium iron phosphate raw material is improved, and the production efficiency is improved.
Drawings
The utility model is further explained below with reference to the drawings and examples:
FIG. 1 is a schematic diagram of the front structure of the present utility model;
FIG. 2 is a schematic view of the appearance structure of the present utility model;
FIG. 3 is a schematic perspective view of an annular bracket according to the present utility model;
FIG. 4 is a schematic perspective view of the connection relationship between the positioning block and the second filter screen;
fig. 5 is a schematic perspective view of the connection relationship between the second tooth block and the case.
Reference numerals illustrate: 1. a case; 2. a grinding cylinder; 3. a rotating rod; 4. a first filter screen; 5. an annular bracket; 6. a grinding disc; 7. grinding the shaft; 8. tooth block I; 9. tooth block II; 10. a positioning block; 11. a chute; 12. a second filter screen; 13. a connecting seat; 14. an electric push rod; 15. a screw conveyor; 17. a blanking cylinder; 18. a feeding cylinder; 19. a material guide plate; 20. a first discharging hole; 22. a second discharging port; 23. a material collecting box; 25. a servo motor.
Detailed Description
The following detailed description of the present utility model will provide clear and complete description of the technical solutions of the embodiments of the present utility model, with reference to fig. 1 to 5, and it is obvious that the described embodiments 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 utility model provides superfine grinding equipment for lithium iron phosphate raw materials through improvement, as shown in figures 1-5, the superfine grinding equipment comprises a box body 1, a feeding mechanism is arranged at the side of the box body 1, a grinding mechanism and a filtering mechanism are sequentially arranged in the inner cavity of the box body 1 from top to bottom, the grinding mechanism comprises a grinding cylinder 2, a rotating rod 3, a servo motor 25, a first filter screen 4, an annular bracket 5, a grinding disc 6, a grinding shaft 7, a first tooth block 8 and a second tooth block 9, the grinding cylinder 2 is fixedly arranged at the top position of the inner cavity of the box body 1, the annular bracket 5 is arranged below the grinding cylinder 2, the outer wall of the annular bracket 5 is fixedly connected with the inner wall of the box body 1, the same vertically arranged rotating rod 3 is respectively arranged between the grinding cylinder 2 and the annular bracket 5 through bearings, the servo motor 25 is arranged at the top position of the box body 1, the output of the servo motor 25 is fixedly connected with the end key of the rotating rod 3, the outer side of the rotating rod 3 is annularly provided with a grinding disc 6, the bottom of the grinding cylinder 2 is provided with a first filter screen 4, the middle of the first filter screen 4 is provided with an assembly groove for the rotating rod 3 to penetrate, the outer side of the rotating rod 3 between the grinding cylinder 2 and the annular bracket 5 is fixedly connected with a group of symmetrically arranged grinding shafts 7, two grinding shafts 7 are fixedly connected with a first tooth block 8, the inner wall of the box 1 opposite to the first tooth block 8 is provided with a plurality of second tooth blocks 9, the plurality of second tooth blocks 9 are annularly arranged, when the device is used, the device transmits lithium iron phosphate raw materials into the grinding cylinder 2 through a feeding mechanism, at the moment, the servo motor 25 drives the rotating rod 3 to drive the grinding disc 6 to rotate to grind and smash the lithium iron phosphate raw materials, then grind even lithium iron phosphate material and fall through first filter screen 4, great particulate matter raw materials is stopped in the top of first filter screen 4 and continues to grind, and the lithium iron phosphate material on the first filter screen 4 is under the rotation of bull stick 3, grinds the synchronous grinding process of tooth piece one 8 of axle 7 drive, and tooth piece one 8 and tooth piece two 9 carry out extrusion grinding to lithium iron phosphate material, realize two grinding processes, and this device has also improved the grinding precision of lithium iron phosphate raw materials by a wide margin when not influencing grinding efficiency.
Specifically, the filtering mechanism includes locating piece 10, second filter screen 12, connecting seat 13 and electric putter 14, the inner wall fixedly connected with of box 1 a set of locating piece 10 and connecting seat 13 that symmetry set up, two spout 11 has all been seted up to one side that locating piece 10 is relative, two sliding fit has same second filter screen 12 between the spout 11, two the top of connecting seat 13 is fixedly connected with electric putter 14, two electric putter 14 keep away from the bottom side stationary phase connection of connecting seat 13 with second filter screen 12 respectively, and the lithium iron phosphate raw materials that grinds falls to on second filter screen 12 after the secondary grinding process, and electric putter 14 drive second filter screen 12 makes the lithium iron phosphate material on the second filter screen 12 reciprocate on spout 11 up and down this moment for the lithium iron phosphate material that accords with the production standard falls down from the aperture of second filter screen 12 fast, realizes the secondary screening process, so as to carry the screening precision of lithium iron phosphate material.
Specifically, feed mechanism includes screw conveyer 15, feed cylinder 17 and pan feeding section of thick bamboo 18, the side of pan feeding section of thick bamboo 18 is equipped with screw conveyer 15, discharge gate one 20 has been seted up to the bottom of pan feeding section of thick bamboo 18, discharge gate one 20 is linked together with the pan feeding end of screw conveyer 15, the discharge end intercommunication of screw conveyer 15 has feed cylinder 17, the one end that feed cylinder 17 extends to box 1 inner chamber is linked together with grinding vessel 2, throws the lithium iron phosphate raw materials into pan feeding section of thick bamboo 18, then falls into grinding vessel 2 through feed cylinder 17 under the transmission of screw conveyer 15, realizes automatic material loading process, carries lithium iron phosphate raw materials material loading efficiency.
Specifically, the blanking barrel 17 is internally provided with a guide plate 19 which is obliquely arranged, and the inclined guide plate 19 is arranged so that lithium iron phosphate raw materials conveniently fall into the grinding barrel 2.
Specifically, the bottom of box 1 has seted up discharge gate two 22, the below of discharge gate two 22 is equipped with collection case 23, grinds even lithium iron phosphate raw materials and falls to the collection incasement 23 of below through discharge gate two 22, realizes collecting intensively, labour saving and time saving more.
Specifically, the aperture of the second filter screen 12 is smaller than that of the first filter screen 4, so as to improve the grinding precision of the lithium iron phosphate raw material.
Working principle: when the device is used, lithium iron phosphate raw materials are thrown into the feeding cylinder 18, then fall into the grinding cylinder 2 through the discharging cylinder 17 under the transmission of the screw conveyor 15, an automatic feeding process is realized, the feeding efficiency of the lithium iron phosphate raw materials is improved, at the moment, the servo motor 25 drives the rotating rod 3 to drive the grinding disc 6 to rotate, the grinding and crushing process is carried out on the lithium iron phosphate raw materials, then the uniformly ground lithium iron phosphate raw materials fall down through the first filter screen 4, larger particle raw materials are intercepted above the first filter screen 4 and are continuously ground, the grinding shaft 7 drives the tooth block I8 to synchronously grind the lithium iron phosphate raw materials under the rotation of the rotating rod 3, the tooth block I8 and the tooth block II 9 carry out extrusion grinding on the lithium iron phosphate raw materials, and the device realizes two grinding processes without affecting the grinding efficiency, and greatly improves the grinding precision of the lithium iron phosphate raw materials;
the ground lithium iron phosphate raw material falls onto the second filter screen 12 after the secondary grinding process, at this time, the electric putter 14 drives the second filter screen 12 to move upwards or downwards back and forth on the chute 11, so that the lithium iron phosphate material on the second filter screen 12 falls down from the aperture of the second filter screen 12 rapidly in the up-down reciprocating process, the secondary screening process is realized, so as to improve the screening precision of the lithium iron phosphate material, and finally, the uniformly ground lithium iron phosphate material falls into the collecting box 23 below through the second discharge hole 22, thereby realizing centralized collection and saving time and labor.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model; various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The superfine grinding equipment for the lithium iron phosphate raw material is characterized in that: the grinding device comprises a box body (1), a feeding mechanism is arranged at the side of the box body (1), a grinding mechanism and a filtering mechanism are sequentially arranged in the inner cavity of the box body (1) from top to bottom, the grinding mechanism comprises a grinding cylinder (2), a rotating rod (3), a servo motor (25), a first filter screen (4), an annular bracket (5), a grinding disc (6), a grinding shaft (7), a tooth block I (8) and a tooth block II (9), the grinding cylinder (2) is fixedly arranged at the top position of the inner cavity of the box body (1), an annular bracket (5) is arranged below the grinding cylinder (2), the outer wall of the annular bracket (5) is fixedly connected with the inner wall of the box body (1), the same rotating rod (3) which is vertically arranged is respectively arranged between the grinding cylinder (2) and the annular bracket (5) through bearings, the servo motor (25) is arranged at the top position of the box body (1), the output of the servo motor (25) is fixedly connected with the end key of the rotating rod (3), the grinding disc (6) is annularly arranged at the outer side of the rotating rod (3), the first filter screen (4) is arranged at the bottom of the first filter screen (4) and penetrates through the middle part of the first filter screen (4), the grinding device is characterized in that a group of symmetrically arranged grinding shafts (7) are fixedly connected to the outer side of a rotating rod (3) between the grinding cylinder (2) and the annular support (5), two grinding shafts (7) are fixedly connected with first tooth blocks (8), a plurality of second tooth blocks (9) are mounted on the inner wall, opposite to the first tooth blocks (8), of the box body (1), and the second tooth blocks (9) are annularly arranged.
2. The superfine grinding device for lithium iron phosphate raw materials according to claim 1, wherein: the filtering mechanism comprises a positioning block (10), a second filter screen (12), a connecting seat (13) and an electric push rod (14), wherein the inner wall of the box body (1) is fixedly connected with a group of symmetrically arranged positioning blocks (10) and connecting seats (13), sliding grooves (11) are formed in one opposite sides of the positioning blocks (10), the same second filter screen (12) is slidingly matched between the sliding grooves (11), the electric push rod (14) is fixedly connected with the upper side of the connecting seats (13), and one sides, far away from the connecting seats (13), of the electric push rod (14) are fixedly connected with the bottom sides of the second filter screen (12) respectively.
3. The superfine grinding device for lithium iron phosphate raw materials according to claim 1, wherein: the feeding mechanism comprises a screw conveyor (15), a discharging barrel (17) and a feeding barrel (18), wherein the screw conveyor (15) is arranged at the side of the feeding barrel (18), a discharging port I (20) is formed in the bottom end of the feeding barrel (18), the discharging port I (20) is communicated with the feeding end of the screw conveyor (15), the discharging end of the screw conveyor (15) is communicated with the discharging barrel (17), and one end, extending to the inner cavity of the box body (1), of the discharging barrel (17) is communicated with the grinding barrel (2).
4. A lithium iron phosphate raw material superfine grinding device according to claim 3, characterized in that: a guide plate (19) which is obliquely arranged is arranged in the blanking barrel (17).
5. A lithium iron phosphate raw material superfine grinding device according to claim 3, characterized in that: the bottom of the box body (1) is provided with a second discharge port (22), and a material collecting box (23) is arranged below the second discharge port (22).
6. The superfine grinding device for lithium iron phosphate raw materials according to claim 2, wherein: the aperture of the second filter screen (12) is smaller than that of the first filter screen (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320896127.0U CN219923205U (en) | 2023-04-20 | 2023-04-20 | Superfine grinding equipment for lithium iron phosphate raw materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320896127.0U CN219923205U (en) | 2023-04-20 | 2023-04-20 | Superfine grinding equipment for lithium iron phosphate raw materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219923205U true CN219923205U (en) | 2023-10-31 |
Family
ID=88491394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320896127.0U Active CN219923205U (en) | 2023-04-20 | 2023-04-20 | Superfine grinding equipment for lithium iron phosphate raw materials |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219923205U (en) |
-
2023
- 2023-04-20 CN CN202320896127.0U patent/CN219923205U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN219663787U (en) | Environment-friendly cement energy-saving efficient grinding equipment | |
| CN116393222A (en) | Agricultural machinery crushing device and operation method thereof | |
| CN219923205U (en) | Superfine grinding equipment for lithium iron phosphate raw materials | |
| CN115463601B (en) | Mixing device for grinding wheel preparation | |
| CN217615214U (en) | High-efficient sand mill of raw materials of chemical preparation production usefulness | |
| CN115805121A (en) | Grinding device and method for preparing battery-grade iron phosphate from waste lithium iron phosphate slag | |
| CN215743797U (en) | Laboratory disc grinding device | |
| CN211678164U (en) | Mixed sintering equipment with crushing function for preparing sintering powder | |
| CN210496015U (en) | Low-speed mixer | |
| CN208896177U (en) | A kind of Manufacture of medicinal slices of TCM chipper | |
| CN112044754A (en) | Feeding device for flour processing | |
| CN218689883U (en) | Artificial graphite particle production equipment | |
| CN212554973U (en) | Production system with bridging-preventing extruder for powder coating | |
| CN221492302U (en) | High-energy expanding agent preparation blendor | |
| CN221638263U (en) | Putty powder production processingequipment | |
| CN220780615U (en) | Reinforcing device for recycled concrete aggregate | |
| CN212576045U (en) | Inclined mixer for lithium manganate powder production | |
| CN220657647U (en) | Niobium powder production device | |
| CN221452839U (en) | Tea-seed oil processing is with rubbing crusher | |
| CN212418108U (en) | High altitude dark tea milling device convenient to unloading | |
| CN216063450U (en) | Efficient crusher for feed processing production | |
| CN214320876U (en) | Rhenium grain preparation facilities | |
| CN220737681U (en) | Coating processing raw materials grinder | |
| CN221580814U (en) | Fodder breaks up crushing apparatus | |
| CN220634476U (en) | Raw material crushing device for insulator processing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |