CN209811884U - Magnetic grinding device for large plane polishing - Google Patents
Magnetic grinding device for large plane polishing Download PDFInfo
- Publication number
- CN209811884U CN209811884U CN201920328257.8U CN201920328257U CN209811884U CN 209811884 U CN209811884 U CN 209811884U CN 201920328257 U CN201920328257 U CN 201920328257U CN 209811884 U CN209811884 U CN 209811884U
- Authority
- CN
- China
- Prior art keywords
- magnetic pole
- lifting
- magnetic
- motor
- lower sliding
- 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.)
- Expired - Fee Related
Links
Abstract
The utility model relates to a magnetic grinding device for large plane polishing, which comprises a frame, a workpiece clamping table, a cross slide rail working table, a movable bracket, a lifting mechanism and a grinding device; the workpiece clamping table and the cross slide rail working table are arranged on the rack, and the movable support can move on the cross slide rail working table along the transverse direction and the longitudinal direction; one side of the movable support is provided with a lifting mechanism, and the grinding device is arranged on the lifting mechanism and can move up and down; grinder comprises grinding motor, motor chuck, magnetic pole dish and magnetic pole, and grinding motor passes through the motor chuck connects the magnetic pole dish, and the bottom of magnetic pole dish is equipped with a plurality of magnetic poles, and the magnetic pole is installed on the magnetic pole dish according to the mode that N utmost point, S utmost point were installed in turn, and multichannel vertically and horizontally staggered' S magnetic pole groove is seted up to the bottom surface of magnetic pole. The utility model discloses can guarantee the surface quality and the plane degree that the plane ground, can high-efficiently accomplish again and grind processing to the big plane of non-magnetic conduction work piece, and with low costs, it is effectual to grind.
Description
Technical Field
The utility model relates to a magnetic grinding technical field especially relates to a magnetic grinding device for big plane polishing.
Background
With the development of aerospace, optics and other technologies, higher requirements are put forward on the surface quality of complex and precise parts. Magnetic lapping, which has emerged in recent decades, is a very effective finishing technique. The processing method can effectively grind the micro surface and the complex concave-convex surface, and is particularly suitable for processing the inner surface and the outer surface of a circular tube and deburring.
The plane polishing is a common and important processing method in industrial production, and the quality of the plane polishing directly affects the surface quality, the flatness and the workpiece performance of a workpiece. The currently used plane polishing methods are mainly divided into two types: firstly, polishing by using a milling machine, and secondly, manually polishing. The quality of the polished plane of the milling machine mainly depends on the milling cutter, and the polishing cost is very high, so that the milling machine cannot be widely applied in many fields; although the cost can be greatly reduced by manual polishing, the flatness of the polishing cannot be guaranteed. The technology of polishing large planar workpieces by magnetic grinding is not common.
Disclosure of Invention
The utility model provides a magnetic grinding device and magnetic grinding method for big plane polishing can guarantee the surface quality and the plane degree that the plane ground, can high-efficiently accomplish again and grind processing to the big plane of non-magnetic conduction work piece, and with low costs, and grinding effect is good.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a magnetic grinding device for large plane polishing comprises a frame, a workpiece clamping table, a cross slide rail working table, a movable support, a lifting mechanism and a grinding device; the workpiece clamping table and the cross slide rail working table are both horizontally arranged on the rack, and the workpiece clamping table is used for clamping a workpiece; the cross slide rail workbench is provided with a movable support which can move on the cross slide rail workbench along the transverse direction and the longitudinal direction; a lifting mechanism is arranged on one side of the movable support, and the grinding device is arranged on the lifting mechanism and can move up and down; grinder comprises grinding motor, motor chuck, magnetic pole dish and magnetic pole, the grinding motor passes through the motor chuck is connected the magnetic pole dish, the bottom of magnetic pole dish is equipped with a plurality of magnetic poles, the magnetic pole is installed on the magnetic pole dish according to the mode that N utmost point, S utmost point were installed in turn, and multichannel vertically and horizontally staggered' S magnetic pole groove is seted up to the bottom surface of magnetic pole.
The cross-shaped sliding rail working table consists of an upper sliding rail mechanism and a lower sliding rail mechanism, wherein the upper sliding rail mechanism consists of an upper sliding table, an upper sliding table lead screw, an upper sliding table motor and an upper sliding block; the lower slide rail mechanism is composed of a lower sliding table, a lower sliding table lead screw, a lower sliding table motor and a lower sliding block, wherein the lower sliding table and the upper sliding table are staggered and vertically arranged, the lower sliding table motor is fixed at one end of the lower sliding table, the lower sliding table lead screw and the lower sliding table are arranged in the same direction, the lower sliding table motor drives the lower sliding table lead screw to rotate and drive the lower sliding block to move along the lower sliding table lead screw, and the lower sliding block is fixedly connected with the upper sliding table.
The two sides of the upper sliding table are provided with upper sliding table sliding rails, and the two sides of the movable support are provided with sliding grooves matched with the upper sliding table sliding rails to slide.
The two sides of the lower sliding table are provided with lower sliding table sliding rails, and the two sides of the upper sliding table are provided with sliding grooves matched with the lower sliding table sliding rails to slide.
The lifting mechanism consists of a lifting motor, a lifting screw rod, a lifting slide rail and a lifting slide block, the lifting motor is fixed at the top of the movable support, the lifting slide rail is respectively arranged on two sides of the lifting screw rod, and the lifting motor drives the lifting screw rod to rotate and drives the lifting slide block to move up and down along the lifting slide rail; the grinding device is arranged on the lifting slide block.
The top of the movable support is provided with a cantilever beam structure, the lifting mechanism is fixed at the overhanging end of the cantilever beam, and an inclined support is arranged below the cantilever beam.
The magnetic poles are permanent magnet magnetic poles.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the utility model has strong applicability, can process workpieces with large planes or small planes, and can be applied to small laboratories and large processing plants;
2) the utility model adopts the magnetic grinding method to process the plane, can ensure the flatness and roughness requirements of the workpiece, and has high processing precision;
3) the utility model can accurately control the gap between the workpiece and the magnetic pole, and has good grinding effect;
4) the device of the utility model has simple structure, convenient operation, low manufacturing cost and good environmental protection;
5) the utility model can reduce the working intensity of workers;
6) the utility model discloses set up a plurality of vertically and horizontally staggered' S magnetic pole grooves on the magnetic pole, the magnetic pole adopts N-S-N-S to arrange the mode in turn, and the N utmost point forms closed magnetic circuit with adjacent S utmost point, and work piece surface magnetic pole pressure is stronger, can increase the magnetic grinding particle that adsorbs on the magnetic pole surface to the grinding pressure of work piece surface, makes the effective grinding area increase of magnetic pole dish and work piece;
7) the utility model discloses the permanent magnet of chooseing for use can produce a lasting effect magnetic field in specific workspace, and is small than the electromagnetism utmost point moreover, light in weight.
8) The utility model discloses an axial feed of lower slip table forms complicated spiral line orbit with the combination of magnetic pole dish autogyration at the work surface, and the transverse feed through last slip table drives whole grinding mechanism continuous processing, evenly polishes the work surface in succession.
Drawings
Fig. 1 is a schematic perspective view (without a frame) of a magnetic grinding device for large-plane polishing according to the present invention.
Fig. 2 is a schematic view of a vertical member structure of the grinding device (without grinding motor).
Fig. 3 is a schematic view of the linear processing track of the magnetic pole disk during grinding.
Fig. 4 is a schematic diagram of the S-shaped processing track of the magnetic pole plate during grinding.
FIG. 5 is a schematic diagram of the operation of a single magnetic abrasive particle of the present invention.
In the figure: 1. an upper sliding table motor 2, a lower sliding table motor 3, an upper sliding table screw rod 4, a lower sliding table screw rod 5, a movable support 6, a lifting motor 7, a lifting screw rod 8, a lifting sliding rail 9, a grinding motor 10, a magnetic pole disc 11, a workpiece 12, a workpiece clamping table 13, a motor chuck 14 and a magnetic pole
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1, the magnetic grinding device for large plane polishing of the present invention comprises a frame, a workpiece clamping table 12, a cross slide rail worktable, a movable support 5, a lifting mechanism and a grinding device; the workpiece clamping table 12 and the cross slide rail working table are both horizontally arranged on the rack, and the workpiece clamping table 12 is used for clamping a workpiece 11; a movable support 5 is arranged on the cross slide rail workbench, and the movable support 5 can move on the cross slide rail workbench along the transverse direction and the longitudinal direction; a lifting mechanism is arranged on one side of the movable support 5, and the grinding device is arranged on the lifting mechanism and can move up and down; as shown in fig. 1 and 2, the grinding device is composed of a grinding motor 9, a motor chuck 13, a magnetic pole disk 10 and magnetic poles 14, wherein the grinding motor 9 is connected with the magnetic pole disk 10 through the motor chuck 13, the bottom of the magnetic pole disk 10 is provided with a plurality of magnetic poles 14, the magnetic poles 14 are installed on the magnetic pole disk 10 in a manner that N poles and S poles are alternately installed, and a plurality of criss-cross magnetic pole grooves are formed in the bottom surface of the magnetic poles 14.
The cross-shaped sliding rail working table is composed of an upper sliding rail mechanism and a lower sliding rail mechanism, wherein the upper sliding rail mechanism is composed of an upper sliding table, an upper sliding table screw rod 3, an upper sliding table motor 1 and an upper sliding block, the upper sliding table motor 1 is fixed at one end of the upper sliding table, the upper sliding table screw rod 3 and the upper sliding table are arranged in the same direction, the upper sliding table motor 1 drives the upper sliding table screw rod 3 to rotate and drives the upper sliding block to move along the upper sliding table screw rod 3, and the upper sliding block is fixedly connected with a moving support 5; the lower slide rail mechanism is composed of a lower sliding table, a lower sliding table lead screw 4, a lower sliding table motor 2 and a lower sliding block, wherein the lower sliding table and the upper sliding table are staggered and vertically arranged, the lower sliding table motor 2 is fixed at one end of the lower sliding table, the lower sliding table lead screw 4 and the lower sliding table are arranged in the same direction, the lower sliding table lead screw 4 is driven by the lower sliding table motor 2 to rotate and drive the lower sliding block to move along the lower sliding table lead screw 4, and the lower sliding block is fixedly connected with the upper sliding table.
The two sides of the upper sliding table are provided with upper sliding table sliding rails, and the two sides of the movable support 5 are provided with sliding grooves matched with the upper sliding table sliding rails to slide.
The two sides of the lower sliding table are provided with lower sliding table sliding rails, and the two sides of the upper sliding table are provided with sliding grooves matched with the lower sliding table sliding rails to slide.
The lifting mechanism consists of a lifting motor 6, a lifting screw 7, a lifting slide rail 8 and a lifting slide block, wherein the lifting motor 6 is fixed at the top of the movable support 5, the lifting slide rail 8 is respectively arranged at two sides of the lifting screw 7, and the lifting motor 6 drives the lifting screw 7 to rotate and drives the lifting slide block to move up and down along the lifting slide rail 8; the grinding device is arranged on the lifting slide block.
The top of the movable support 5 is provided with a cantilever beam structure, the lifting mechanism is fixed at the overhanging end of the cantilever beam, and an inclined support is arranged below the cantilever beam.
The magnetic poles 14 are permanent magnet ferromagnetic poles.
Adopt the grinder is to the course of working of big plane polishing as follows:
(1) clamping a workpiece 11 on a workpiece clamping table 12, uniformly mixing grinding fluid and magnetic grinding particles according to the proportion of 1: 1.5-3, and adsorbing the mixture on a magnetic pole 14;
(2) starting a lifting motor 6, driving the grinding device to move up and down by a lifting mechanism, and adjusting the vertical distance between a magnetic pole disc 10 and a workpiece 11 to keep the distance between the bottom surface of a magnetic pole 14 and the upper surface of the workpiece 11 at 2-3 mm;
(3) the horizontal position of the grinding device is adjusted through a cross slide rail workbench, so that the magnetic pole disc 10 is positioned at the initial position of the workpiece 11;
(4) starting a grinding motor 9, driving a magnetic pole disc 10 to rotate, forming a flexible magnetic brush by magnetic grinding particles under the action of a magnetic field, longitudinally feeding a grinding device under the driving of a cross slide rail workbench, and performing linear track surface polishing on a workpiece 11 through the scraping and rolling actions of the magnetic brush; the stroke of one longitudinal feeding is larger than the longitudinal length of the workpiece 11;
(5) after the primary longitudinal feeding is finished, the grinding device is driven by the cross slide rail working table to perform transverse feeding, the feeding length is less than or equal to the diameter of the magnetic pole disc 10, and then secondary longitudinal feeding is performed along the direction opposite to the primary longitudinal feeding; repeating the steps, and finishing the surface polishing of the linear track on the surface of the workpiece 11 (as shown in fig. 3);
(6) after the surface polishing of the linear track is finished, the cross slide rail workbench drives the magnetic pole disc 10 to move longitudinally and transversely at the same time, and the surface of the workpiece 11 is subjected to S-shaped track continuous grinding and polishing (as shown in fig. 4);
(7) the type and the times of workpiece surface polishing are set according to the machining precision requirement, and after the workpiece surface polishing is finished completely, the grinding device is driven to return to the initial position through the cross slide rail workbench and the lifting mechanism, and the workpiece 11 is detached from the workpiece clamping table 12.
The grinding fluid is water-based grinding fluid.
The magnetic abrasive particles are composed of an iron-based phase and an abrasive phase.
The following examples are carried out on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
In the embodiment, a lower sliding table in the cross-shaped sliding rail working table is transversely arranged along the rack, and an upper sliding table is longitudinally arranged along the rack; the upper sliding table lead screw 3 and the lower sliding table lead screw 4 are respectively connected with the corresponding upper sliding table motor 1 and the lower sliding table motor 2 through chucks. The upper sliding table motor 1 and the lower sliding table motor 2 respectively drive the upper sliding block and the lower sliding block to move longitudinally or transversely, the grinding device is arranged on the cross-shaped sliding rail workbench through the lifting mechanism and the moving support, the height-direction distance between a magnetic pole 14 on the grinding device and the surface to be machined of the workpiece 11 is adjusted by the lifting mechanism, the grinding device is driven by the cross-shaped sliding rail workbench to do horizontal longitudinal and transverse unidirectional motion or compound motion, a linear grinding track and an S-shaped grinding track are formed on the surface to be machined of the workpiece 11, and therefore continuous and uniform machining of a large plane is achieved.
The lifting mechanism is internally provided with a lifting slide rail 8 which is vertical to the plane of the workpiece clamping table 12, the lifting screw 7 is fixed below the lifting motor 6 through a motor chuck 13 and is driven by the lifting motor 6 to rotate, and the grinding device is driven to lift through the movement of the lifting slide block along the lifting slide rail 8.
The grinding device comprises a grinding motor 9 fixed on the lifting mechanism, a magnetic pole disc 10 fixed with the grinding motor 9 through a motor chuck 13, and a plurality of magnetic poles 14 fixed on the magnetic pole disc 10; in this embodiment, the magnetic pole disk 10 is a disk-shaped magnetic pole disk, a plurality of magnetic poles 14 are uniformly arranged on the bottom of the disk-shaped magnetic pole disk 10 along the circumferential direction, a plurality of magnetic pole grooves are formed on the bottom surface of the magnetic poles 14 in a criss-cross manner, and the magnetic poles 14 are mounted on the magnetic pole disk in an N-S-N-S alternating mounting manner. During polishing, a mixture of magnetic abrasive particles and a water-based polishing liquid is adsorbed to the magnetic pole 14, and the water-based polishing liquid and the magnetic abrasive particles are mixed at a ratio of 1: 2.
The height of the grinding device is adjusted, and the upper surfaces of the workpieces 11 with different thicknesses can be machined.
The magnetic pole 14 is provided with a plurality of magnetic pole grooves with staggered longitudinal grooves, so that the change of the magnetic field gradient is increased, the magnetic grinding particles are stressed unevenly to generate the rolling and updating effects on the edges of the magnetic pole, and the service life of the magnetic grinding particles is prolonged. The magnetic abrasive particles are composed of an iron-based phase and a grinding phase, the iron-based phase has magnetic permeability, and the grinding phase has a high hardness characteristic. Under the action of the magnetic field, the magnetic abrasive particles form a magnetic brush with a certain strength and are pressed on the surface of the workpiece 11, so that the surface of the workpiece 11 is ground and polished (as shown in fig. 5).
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (7)
1. A magnetic grinding device for large plane polishing is characterized by comprising a rack, a workpiece clamping table, a cross slide rail working table, a movable support, a lifting mechanism and a grinding device; the workpiece clamping table and the cross slide rail working table are both horizontally arranged on the rack, and the workpiece clamping table is used for clamping a workpiece; the cross slide rail workbench is provided with a movable support which can move on the cross slide rail workbench along the transverse direction and the longitudinal direction; a lifting mechanism is arranged on one side of the movable support, and the grinding device is arranged on the lifting mechanism and can move up and down; grinder comprises grinding motor, motor chuck, magnetic pole dish and magnetic pole, the grinding motor passes through the motor chuck is connected the magnetic pole dish, the bottom of magnetic pole dish is equipped with a plurality of magnetic poles, the magnetic pole is installed on the magnetic pole dish according to the mode that N utmost point, S utmost point were installed in turn, and multichannel vertically and horizontally staggered' S magnetic pole groove is seted up to the bottom surface of magnetic pole.
2. The magnetic grinding device for large-plane polishing according to claim 1, wherein the cross slide rail working table is composed of an upper slide rail mechanism and a lower slide rail mechanism, wherein the upper slide rail mechanism is composed of an upper slide table, an upper slide table lead screw, an upper slide table motor and an upper slide block, the upper slide table motor is fixed at one end of the upper slide table, the upper slide table lead screw and the upper slide table are arranged in the same direction, the upper slide table motor drives the upper slide table lead screw to rotate and drives the upper slide block to move along the upper slide table lead screw, and the upper slide block is fixedly connected with the movable support; the lower slide rail mechanism is composed of a lower sliding table, a lower sliding table lead screw, a lower sliding table motor and a lower sliding block, wherein the lower sliding table and the upper sliding table are staggered and vertically arranged, the lower sliding table motor is fixed at one end of the lower sliding table, the lower sliding table lead screw and the lower sliding table are arranged in the same direction, the lower sliding table motor drives the lower sliding table lead screw to rotate and drive the lower sliding block to move along the lower sliding table lead screw, and the lower sliding block is fixedly connected with the upper sliding table.
3. The magnetic grinding device for large plane polishing as claimed in claim 2, wherein the two sides of the upper sliding platform are provided with upper sliding platform sliding rails, and the two sides of the movable bracket are provided with sliding grooves matched with the upper sliding platform sliding rails for sliding.
4. The magnetic grinding device for large plane polishing as claimed in claim 2, wherein the lower sliding track is provided on both sides of the lower sliding table, and the sliding track is provided on both sides of the upper sliding table to slide in cooperation with the lower sliding track.
5. The magnetic grinding device for large plane polishing as claimed in claim 1, wherein the lifting mechanism is composed of a lifting motor, a lifting screw, a lifting slide rail and a lifting slide block, the lifting motor is fixed on the top of the movable support, the lifting slide rail is respectively arranged on two sides of the lifting screw, the lifting motor drives the lifting screw to rotate and drives the lifting slide block to move up and down along the lifting slide rail; the grinding device is arranged on the lifting slide block.
6. The magnetic grinding device for large plane polishing of claim 1, wherein the top of the moving support has a cantilever structure, the lifting mechanism is fixed at the overhanging end of the cantilever, and the inclined support is arranged below the cantilever.
7. A magnetic force lapping device for large plane polishing as claimed in claim 1, wherein said magnet is a permanent magnet ferromagnetic pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920328257.8U CN209811884U (en) | 2019-03-15 | 2019-03-15 | Magnetic grinding device for large plane polishing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920328257.8U CN209811884U (en) | 2019-03-15 | 2019-03-15 | Magnetic grinding device for large plane polishing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209811884U true CN209811884U (en) | 2019-12-20 |
Family
ID=68875646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920328257.8U Expired - Fee Related CN209811884U (en) | 2019-03-15 | 2019-03-15 | Magnetic grinding device for large plane polishing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209811884U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110000621A (en) * | 2019-03-15 | 2019-07-12 | 辽宁科技大学 | A kind of magnetic grinder and magnetic grinding method for big plane polishing |
| CN113805297A (en) * | 2021-09-13 | 2021-12-17 | 北京控制工程研究所 | Tool for installing gyro assembly reference mirror |
-
2019
- 2019-03-15 CN CN201920328257.8U patent/CN209811884U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110000621A (en) * | 2019-03-15 | 2019-07-12 | 辽宁科技大学 | A kind of magnetic grinder and magnetic grinding method for big plane polishing |
| CN110000621B (en) * | 2019-03-15 | 2024-02-09 | 辽宁科技大学 | Magnetic grinding device and magnetic grinding method for large-plane polishing |
| CN113805297A (en) * | 2021-09-13 | 2021-12-17 | 北京控制工程研究所 | Tool for installing gyro assembly reference mirror |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202752950U (en) | Pipe fitting inner wall and outer wall vibration magnetic polishing machine | |
| CN103659477B (en) | A kind of belt sander | |
| CN110000621B (en) | Magnetic grinding device and magnetic grinding method for large-plane polishing | |
| CN110695775A (en) | Device and process for ultrasonically grinding double-panel parts | |
| CN209811884U (en) | Magnetic grinding device for large plane polishing | |
| CN104669086A (en) | Crystal plate-chamfering device | |
| CN101829942A (en) | Machining center for polishing and grinding square rod | |
| CN210909279U (en) | Numerical control rotating table surface grinding machine | |
| CN104759959A (en) | Batch processing method for non-ferromagnetic round steel test sample work-piece | |
| CN205765562U (en) | The damping grinding machine that a kind of machining is special | |
| CN105127845A (en) | Tool-post grinder | |
| CN108481984B (en) | Numerical control engraving and sanding composite machining center | |
| CN203611078U (en) | Belt sander | |
| CN108481166A (en) | A kind of multistation three-shaft linkage numerical-control polishing equipment | |
| CN112658403A (en) | Magnetic grinding device and method for tooth surface of helical gear | |
| CN212095576U (en) | Automatic grinding equipment for single crystal cutter | |
| CN208697002U (en) | The magnetic grinder of annular groove inside and outside a kind of multi-angle conical surface workpiece | |
| CN211277656U (en) | Device for ultrasonically grinding double-panel parts | |
| CN107457614B (en) | Magnetic abrasive grinding and polishing device for polishing large-size workpiece and working method thereof | |
| CN203236320U (en) | Grinding machine for grinded cycloid gear | |
| CN205765524U (en) | Digital control vertical honing machine | |
| CN212218097U (en) | Polishing device applied to robot | |
| CN204913555U (en) | Monocrystalline silicon chamfer lathe | |
| CN209811885U (en) | Magnetic particle grinding device for finishing inner surface of deep groove key groove | |
| CN203221385U (en) | Crystal and glass triangular bar circulating grinding machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191220 Termination date: 20210315 |