CN208713154U - A kind of laser cutting machine that cutting accuracy is high - Google Patents
A kind of laser cutting machine that cutting accuracy is high Download PDFInfo
- Publication number
- CN208713154U CN208713154U CN201821323267.4U CN201821323267U CN208713154U CN 208713154 U CN208713154 U CN 208713154U CN 201821323267 U CN201821323267 U CN 201821323267U CN 208713154 U CN208713154 U CN 208713154U
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- CN
- China
- Prior art keywords
- cabinet
- cut
- cutting machine
- fixed
- gas
- 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
- 238000005520 cutting process Methods 0.000 title claims abstract description 30
- 238000003698 laser cutting Methods 0.000 title claims abstract description 20
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 16
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 16
- 239000013307 optical fiber Substances 0.000 claims description 22
- 238000004140 cleaning Methods 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 230000005389 magnetism Effects 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 17
- 239000003546 flue gas Substances 0.000 abstract description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052799 carbon Inorganic materials 0.000 abstract description 8
- 238000007254 oxidation reaction Methods 0.000 abstract description 6
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
Landscapes
- Laser Beam Processing (AREA)
Abstract
The utility model discloses a kind of laser cutting machines that cutting accuracy is high, including cabinet, the open setting in the front end of the cabinet, the lower surface of box house is equipped with support device, the inside of cabinet is equipped with plane bearing, the lower ring of plane bearing is fixedly connected by fixed frame with the left side top of box house with internal right side top, the upper ring of plane bearing is coaxially fixed with hollow wheel gear, the inner wall of hollow wheel gear is fixedly connected with the both ends of sliding bar respectively, plate to be cut is cut in the inside of cabinet, and the inside of cabinet is full of carbon dioxide, the cut place of plate to be cut is not susceptible to oxidation reaction, it ensure that the cut quality of plate to be cut；The flue gas that cutting generates is located in the box body portion, and the flue gas for cutting generation enters in positioning tube body by check valve, gas-guide tube, connecting tube, and active carbon net is filtered absorption to flue gas, guarantees the health of operator.
Description
Technical field
The utility model relates to laser cutting machine technical field, specially a kind of laser cutting machine that cutting accuracy is high and its
Application method.
Background technique
When existing laser cutting machine cutting material, the cut place temperature of material is fine, and the cut place of material is easy to happen
Oxidation reaction influences the quality of material；A large amount of smog can be generated in laser cutting machine cutting process, if not in time thoroughly
It removes, smog can pollute the air in workshop, influence the health of operator.
Utility model content
The technical problems to be solved in the utility model is to overcome existing defect, provides a kind of laser that cutting accuracy is high and cuts
Cutting mill, plate to be cut are cut in the inside of cabinet, and the inside of cabinet is full of carbon dioxide, the cutting of plate to be cut
Place is not susceptible to oxidation reaction, ensure that the cut quality of plate to be cut；The flue gas that cutting generates is located in the box body portion, cuts
The flue gas of generation enters in positioning tube body by check valve, gas-guide tube, connecting tube, and active carbon net is filtered suction to flue gas
It receives, guarantees the health of operator, can effectively solve the problems in background technique.
To achieve the above object, the utility model provides the following technical solutions: a kind of laser cutting machine that cutting accuracy is high,
Including cabinet, the open setting in the front end of the cabinet, the lower surface of box house is equipped with support device, and the inside of cabinet is equipped with flat
Spherical bearing, the fixed company in left side top and internal right side top that the lower ring of plane bearing passes through fixed frame and box house
It connecing, the upper ring of plane bearing is coaxially fixed with hollow wheel gear, and the inner wall of hollow wheel gear is fixedly connected with the both ends of sliding bar respectively,
Slide opening on the downside of sliding bar and sliding shoe is slidably connected, and the screw hole on the upside of sliding shoe is connected with screw flight, screw rod and sliding bar
In parallel, one end of screw rod is connected with the output shaft of second stepper motor by shaft coupling, and second stepper motor is solid by fixed frame
It is scheduled on the upper surface of hollow wheel gear, hollow wheel gear and driving gear engagement, the upper surface of driving gear and the first stepper motor
Output shaft is coaxially fixed, and the first stepper motor is fixed on the upper surface of box house by fixed frame.
Sliding shoe trailing flank lower part and the lower part of optical fiber laser leading flank are hinged by hinged seat, on front side of optical fiber laser
The telescopic end of the top in face and electric telescopic rod is hinged by hinged seat, the fixing end of electric telescopic rod and sliding shoe upper surface
Front side is hinged by hinged seat, is equipped with conducting ring in the mounting hole of cabinet upper surface, the left end in cabinet front face and chamber door
Rear end is rotatablely connected by hinge, and the upper surface of cabinet is fixed with PLC controller, the input terminal and external power supply of PLC controller
Output end electrical connection, the output end of PLC controller by conducting ring respectively with the input terminal of optical fiber laser, the first stepping electricity
The input terminal electrical connection of the input terminal and second stepper motor of machine.
As a kind of optimal technical scheme of the utility model, rectangular opening is offered on the chamber door, is equipped in rectangle
Transparency glass plate.
As a kind of optimal technical scheme of the utility model, the chamber door is fixedly arranged at the front end with the second permanent magnet, cabinet
The position of corresponding second permanent magnet in right side is fixed with the first permanent magnet.
As a kind of optimal technical scheme of the utility model, the chamber door left side is fixedly arranged at the front end with U-shaped bar, U-shaped
Rubber pad is bonded on bar.
As a kind of optimal technical scheme of the utility model, the support device includes high temperature resistant plate, high temperature resistant plate
The inner wall of side and cabinet has gap, and the upper surface of high temperature resistant plate is uniformly fixed with high temperature resistant frustum.
As a kind of optimal technical scheme of the utility model, titanium dioxide is installed on the air inlet of the cabinet lateral surface
Carbon air intake valve, is equipped with check valve on the exhaust outlet of cabinet lateral surface, the gas outlet of check valve and gas cleaning plant into
Port is connected to by gas-guide tube.
As a kind of optimal technical scheme of the utility model, the gas cleaning plant includes positioning tube body, positioning pipe
Closed setting on the left of body positions and is equipped with connecting tube, the inner wall of connecting tube and the right side of gas-guide tube on the air inlet of tube body left side
End is threadedly coupled.
Compared with prior art, the utility model has the beneficial effects that the laser cutting machine that this cutting accuracy is high, to be cut
Plate is cut in the inside of cabinet, and the inside of cabinet is full of carbon dioxide, and the cut place of plate to be cut is not susceptible to
Oxidation reaction ensure that the cut quality of plate to be cut；The flue gas that cutting generates is located in the box body portion, cuts the flue gas of generation
It is entered in positioning tube body by check valve, gas-guide tube, connecting tube, active carbon net is filtered absorption to flue gas, guarantees operation
The health of personnel.
Detailed description of the invention
Fig. 1 is the utility model schematic view of the front view；
Fig. 2 is structure enlargement diagram at the utility model A；
Fig. 3 is the utility model top view cross section structural schematic diagram；
Fig. 4 is structure enlargement diagram at the utility model B.
In figure: 1 driving gear, 2 cabinets, 3 conducting rings, 4PLC controller, 5 sliding bars, 6 carbon dioxide valves, 7
One permanent magnet, 8 gas cleaning plants, 81 active carbon nets, 82 positioning tube bodies, 83 connecting tubes, 9 support devices, 91 high temperature resistant frustums,
92 high temperature resistant plates, 10 optical fiber lasers, 11 electric telescopic rods, 12 U-shaped bars, 13 rubber pads, 14 second permanent magnets, 15 chamber doors, 16
Gas-guide tube, 17 check valves, 18 first stepper motors, 19 plane bearings, 20 hollow wheel gears, 21 screw rods, 22 sliding shoes, 23 second steps
Into motor.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Fig. 1-4 is please referred to, the utility model provides a kind of technical solution: a kind of laser cutting machine that cutting accuracy is high, packet
Cabinet 2 is included, the front end of cabinet 2 is open to be arranged, and the lower surface inside cabinet 2 is equipped with support device 9, and support device 9 includes resistance to height
Warm plate 92, the side of high temperature resistant plate 92 and the inner wall of cabinet 2 have gap, and the upper surface of high temperature resistant plate 92 is uniformly fixed with high temperature resistant
Frustum 91, the inside of cabinet 2 are equipped with plane bearing 19, and the lower ring of plane bearing 19 passes through the left side inside fixed frame and cabinet 2
Face top is fixedly connected with internal right side top, and the upper ring of plane bearing 19 is coaxially fixed with hollow wheel gear 20, hollow tooth
The inner wall of wheel 20 is fixedly connected with the both ends of sliding bar 5 respectively, and the slide opening of 22 downside of sliding bar 5 and sliding shoe is slidably connected, sliding
The screw hole and screw rod 21 of 22 upside of motion block are threadedly coupled, and screw rod 21 is parallel with sliding bar 5, one end of screw rod 21 and the second stepping electricity
The output shaft of machine 23 is connected by shaft coupling, and second stepper motor 23 is fixed on the upper surface of hollow wheel gear 20 by fixed frame,
Hollow wheel gear 20 and driving gear 1 engage, and driving gear 1 can drive hollow wheel gear 20 to rotate, the upper surface of driving gear 1 and
The output shaft of first stepper motor 18 is coaxially fixed, and the first stepper motor 18 is fixed on the upper table inside cabinet 2 by fixed frame
Face.
22 trailing flank lower part of sliding shoe and the lower part of 10 leading flank of optical fiber laser are hinged by hinged seat, optical fiber laser
The top of 10 leading flanks and the telescopic end of electric telescopic rod 11 are hinged by hinged seat, the fixing end and sliding of electric telescopic rod 11
The front side of 22 upper surface of block is hinged by hinged seat, and conducting ring 3,2 leading flank of cabinet are equipped in the mounting hole of 2 upper surface of cabinet
Left end and chamber door 15 rear end by hinge be rotatablely connected, the upper surface of cabinet 2 is fixed with PLC controller 4, PLC controller 4
Input terminal and external power supply output end electrical connection, the output end of PLC controller 4 by conducting ring 3 respectively with optical-fiber laser
The input terminal of the input terminal of device 10, the input terminal of the first stepper motor 18 and second stepper motor 23 is electrically connected, the first stepping electricity
Machine 18 drives hollow wheel gear 20 to rotate by driving gear 1, and hollow wheel gear 20 drives optical fiber to swash by sliding bar 5 and sliding shoe 22
Light device 10 is rotated in horizontal plane, and second stepper motor 23 drives screw rod 21 to rotate, and screw rod 21 drives optical fiber to swash by sliding shoe 22
Light device 10 is moved along sliding bar 5, and electric telescopic rod 11 adjusts the inclination angle of optical fiber laser 10 with respect to the horizontal plane, optical fiber laser
It is accurate convenient that the laser angle of 10 irradiations and position are adjusted, and structure is simple, reduces the high laser cutting machine of this cutting accuracy
Precision.
Rectangular opening is offered on chamber door 15, transparency glass plate is installed in rectangle, and chamber door 15 is fixedly arranged at the front end with second forever
The position of magnet 14, corresponding second permanent magnet 14 in 2 right side of cabinet is fixed with the first permanent magnet 7, the second permanent magnet 14 and first
Permanent magnet 7 adsorbs so that chamber door 15 is in the front end fixation of cabinet 2, and 15 left side of chamber door is fixedly arranged at the front end with U-shaped bar 12, U
Shape bar 12 rotates chamber door 15 convenient for worker, is bonded with rubber pad 13 on U-shaped bar 12.
Carbon dioxide valve 6 is installed on the air inlet of 2 lateral surface of cabinet, is pacified on the exhaust outlet of 2 lateral surface of cabinet
Equipped with check valve 17, the gas outlet of check valve 17 is connected to the air inlet of gas cleaning plant 8 by gas-guide tube 16, gas purification
Device 8 includes positioning tube body 82, and the 82 closed setting in left side of positioning tube body positions the company of being equipped on the air inlet of 82 left side of tube body
Adapter tube 83, the inner wall of connecting tube 83 and the right end of gas-guide tube 16 are threadedly coupled, and plate to be cut is cut in the inside of cabinet 2
It cuts, and the inside of cabinet 2 is full of carbon dioxide, the cut place of plate to be cut is not susceptible to oxidation reaction, ensure that be cut
The cut quality of plate；The flue gas that cutting generates is located inside cabinet 2, cuts the flue gas of generation by check valve 17, gas-guide tube
16, connecting tube 83 enters in positioning tube body 82, and active carbon net 81 is filtered absorption to flue gas, guarantees the body of operator
Health.
A kind of application method for the laser cutting machine that cutting accuracy is high, includes the following steps:
1) plate to be cut is placed on high temperature resistant plate 92, rotation chamber door 15 makes the second permanent magnet 14 and the first permanent magnetism
Iron 7 adsorbs.
2) carbon dioxide valve 6 is connected, and the carbon dioxide in external carbon dioxide gas tank passes through carbon dioxide
Valve 6 enters in cabinet 2, and the inside of cabinet 2 is filled by carbon dioxide gas.
3) PLC controller 4 controls the work of the first stepper motor 18, and the first stepper motor 18 drives sky by driving gear 1
Heart gear 20 rotates, and hollow wheel gear 20 drives optical fiber laser 10 to rotate in horizontal plane by sliding bar 5 and sliding shoe 22；PLC
Controller 4 controls second stepper motor 23 and works, and second stepper motor 23 drives screw rod 21 to rotate, and screw rod 21 passes through sliding shoe 22
Optical fiber laser 10 is driven to move along sliding bar 5, PLC controller 4 controls electric telescopic rod 11 and works, and electric telescopic rod 11 is adjusted
The inclination angle of optical fiber laser 10 with respect to the horizontal plane；The laser that optical fiber laser 10 irradiates is treated cutting plate and is cut.
4) carbon dioxide in external carbon dioxide gas tank enters cabinet all the time by air intake valve 6 by carbon dioxide
In 2, the flue gas for cutting generation enters in positioning tube body 82 by check valve 17, gas-guide tube 16, connecting tube 83, active carbon net 81
Absorption is filtered to flue gas.
Plate to be cut is located at the downside of 2 lateral surface exhaust outlet of cabinet, the inner wall of the side of plate to be cut and cabinet 2 it
Between have gap.
High temperature resistant plate 92 is alumina refractory plate, and the heat resisting temperature of alumina refractory plate is 1800 DEG C.
The utility model, plate to be cut are cut in the inside of cabinet 2, and the inside of cabinet 2 is full of carbon dioxide,
The cut place of plate to be cut is not susceptible to oxidation reaction, ensure that the cut quality of plate to be cut；Cut the flue gas generated
Inside cabinet 2, the flue gas for cutting generation enters in positioning tube body 82 by check valve 17, gas-guide tube 16, connecting tube 83,
Active carbon net 81 is filtered absorption to flue gas, guarantees the health of operator.
First stepper motor 18 drives hollow wheel gear 20 to rotate by driving gear 1, and hollow wheel gear 20 passes through 5 He of sliding bar
Sliding shoe 22 drives optical fiber laser 10 to rotate in horizontal plane, and second stepper motor 23 drives screw rod 21 to rotate, and screw rod 21 passes through
Sliding shoe 22 drives optical fiber laser 10 to move along sliding bar 5, and electric telescopic rod 11 adjusts optical fiber laser 10 relative to level
The inclination angle in face, it is accurate convenient that the laser angle and position that optical fiber laser 10 irradiates are adjusted, and structure is simple, reduces this cutting
The precision of laser cutting machine with high accuracy.
While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art,
It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired
Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.
Claims (7)
1. a kind of laser cutting machine that cutting accuracy is high, including cabinet (2), it is characterised in that: the front end of the cabinet (2) is open
Setting, the internal lower surface of cabinet (2) are equipped with support device (9), and the inside of cabinet (2) is equipped with plane bearing (19), plane axis
The lower ring for holding (19) is fixedly connected by fixed frame with the internal left side top of cabinet (2) with internal right side top, is put down
The upper ring of spherical bearing (19) is coaxially fixed with hollow wheel gear (20), the inner wall of hollow wheel gear (20) respectively with sliding bar (5) two
End is fixedly connected, and the slide opening on the downside of sliding bar (5) and sliding shoe (22) is slidably connected, the screw hole and screw rod on the upside of sliding shoe (22)
(21) it is threadedly coupled, screw rod (21) is parallel with sliding bar (5), one end of screw rod (21) and the output shaft of second stepper motor (23)
It is connected by shaft coupling, second stepper motor (23) is fixed on the upper surface of hollow wheel gear (20), hollow wheel gear by fixed frame
(20) it is coaxially fixed with driving gear (1) engagement, the upper surface of driving gear (1) and the output shaft of the first stepper motor (18),
First stepper motor (18) is fixed on the internal upper surface of cabinet (2) by fixed frame；
Sliding shoe (22) trailing flank lower part and the lower part of optical fiber laser (10) leading flank are hinged by hinged seat, optical fiber laser
(10) telescopic end of the top of leading flank and electric telescopic rod (11) is hinged by hinged seat, the fixing end of electric telescopic rod (11)
It is hinged by hinged seat with the front side of sliding shoe (22) upper surface, conducting ring is installed in the mounting hole of cabinet (2) upper surface
(3), the left end of cabinet (2) leading flank and the rear end of chamber door (15) are rotatablely connected by hinge, and the upper surface of cabinet (2) is fixed with
PLC controller (4), the output end electrical connection of the input terminal and external power supply of PLC controller (4), the output of PLC controller (4)
End passes through conducting ring (3) input terminal and second step with the input terminal of optical fiber laser (10), the first stepper motor (18) respectively
Input terminal into motor (23) is electrically connected.
2. a kind of high laser cutting machine of cutting accuracy according to claim 1, it is characterised in that: on the chamber door (15)
Rectangular opening is offered, transparency glass plate is installed in rectangle.
3. a kind of high laser cutting machine of cutting accuracy according to claim 1, it is characterised in that: the chamber door (15)
It is fixedly arranged at the front end with the second permanent magnet (14), the position of cabinet (2) right side corresponding second permanent magnet (14) is fixed with the first permanent magnetism
Iron (7).
4. a kind of high laser cutting machine of cutting accuracy according to claim 1, it is characterised in that: the chamber door (15) is left
Being fixedly arranged at the front end with U-shaped bar (12) for side, is bonded with rubber pad (13) on U-shaped bar (12).
5. a kind of high laser cutting machine of cutting accuracy according to claim 1, it is characterised in that: the support device
(9) include high temperature resistant plate (92), the side of high temperature resistant plate (92) and the inner wall of cabinet (2) have a gap, high temperature resistant plate (92) it is upper
Surface is uniformly fixed with high temperature resistant frustum (91).
6. a kind of high laser cutting machine of cutting accuracy according to claim 1, it is characterised in that: the cabinet (2) is outside
It is equipped on the air inlet of side carbon dioxide valve (6), check valve is installed on the exhaust outlet of cabinet (2) lateral surface
(17), the gas outlet of check valve (17) is connected to the air inlet of gas cleaning plant (8) by gas-guide tube (16).
7. a kind of high laser cutting machine of cutting accuracy according to claim 6, it is characterised in that: the gas purification dress
Setting (8) includes positioning tube body (82), and closed setting on the left of positioning tube body (82) positions and pacifies on the air inlet of tube body (82) left side
Equipped with connecting tube (83), the inner wall of connecting tube (83) and the right end of gas-guide tube (16) are threadedly coupled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821323267.4U CN208713154U (en) | 2018-08-16 | 2018-08-16 | A kind of laser cutting machine that cutting accuracy is high |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821323267.4U CN208713154U (en) | 2018-08-16 | 2018-08-16 | A kind of laser cutting machine that cutting accuracy is high |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208713154U true CN208713154U (en) | 2019-04-09 |
Family
ID=65977909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821323267.4U Expired - Fee Related CN208713154U (en) | 2018-08-16 | 2018-08-16 | A kind of laser cutting machine that cutting accuracy is high |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208713154U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108857096A (en) * | 2018-08-16 | 2018-11-23 | 马鞍山市中亚机床制造有限公司 | A kind of laser cutting machine that cutting accuracy is high and its application method |
-
2018
- 2018-08-16 CN CN201821323267.4U patent/CN208713154U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108857096A (en) * | 2018-08-16 | 2018-11-23 | 马鞍山市中亚机床制造有限公司 | A kind of laser cutting machine that cutting accuracy is high and its application method |
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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: 20190409 |