CN115341211B - Valve seat ring laser cladding device - Google Patents
Valve seat ring laser cladding device Download PDFInfo
- Publication number
- CN115341211B CN115341211B CN202211052663.9A CN202211052663A CN115341211B CN 115341211 B CN115341211 B CN 115341211B CN 202211052663 A CN202211052663 A CN 202211052663A CN 115341211 B CN115341211 B CN 115341211B
- Authority
- CN
- China
- Prior art keywords
- valve seat
- seat ring
- laser cladding
- working position
- fixing
- 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
- 238000004372 laser cladding Methods 0.000 title claims abstract description 43
- 230000007246 mechanism Effects 0.000 claims description 47
- 238000003825 pressing Methods 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 17
- 238000004140 cleaning Methods 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 6
- 230000006872 improvement Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 14
- 230000009471 action Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a valve seat ring laser cladding device, which relates to the field of valve seat ring laser cladding, and has the advantages that the structure is simple, through the improvement of a valve seat ring processing device, the processing device is provided with four stations, and a device for fixing the valve seat ring can jump to the next station through rotation until the valve seat ring passes through the four stations and is processed sequentially.
Description
Technical Field
The invention relates to the field of valve seat ring laser cladding, in particular to a valve seat ring laser cladding device.
Background
Since the rise of the exhaust temperature of the piston puts higher demands on the thermal conductivity and high-temperature wear resistance of the sintered valve seat insert at high temperatures, the valve seat insert in the prior art suffers from the following drawbacks:
1. the traditional sintered valve seat ring adopts a copper leaching process, but the density can not reach the theoretical density, so that the high-temperature wear resistance is reduced; 2. in order to balance cost, high hardness and high wear resistance, the traditional valve seat ring is filled by adopting two different materials of an upper layer and a lower layer in the forming process, the powder feeding uniformity difference is large, and certain quality risks such as material mixing layers exist. 3. The traditional sintered valve seat ring has the advantages that the high-temperature wear resistance is preferentially considered, the copper content is not more than 25% in design, and the heat conductivity is reduced to further improve the possibility. Meanwhile, in the manufacturing equipment of the valve seat ring in the prior art, all components are scattered, and in the actual production and processing process, the problems of low processing continuity and low processing efficiency of the valve seat ring exist.
Disclosure of Invention
The invention aims to provide a valve seat ring laser cladding device, which can realize a laser cladding process of a valve seat ring by improving a valve seat ring processing device so as to solve the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a valve seat insert laser cladding apparatus comprising:
the feeding assembly is used for conveying the valve seat ring to a processing station;
the rotary mechanism is used for fixing the valve seat ring and switching the processing stations of the valve seat ring through rotation, and comprises four fixing pieces for fixing the valve seat ring and a first driving piece for driving the fixing pieces to rotate, wherein the four fixing pieces correspond to a first working position, a second working position, a third working position and a fourth working position respectively, and
the processing assembly is correspondingly arranged on the processing station of the rotating mechanism and comprises a pressing mechanism corresponding to the first working position, a laser cladding mechanism corresponding to the second working position, a discharging mechanism corresponding to the third working position and a cleaning mechanism corresponding to the fourth working position;
the four fixing pieces comprise three clamping jaws which are uniformly arranged on the circumference, and the lower ends of the fixing pieces are fixedly connected with a material ejection assembly;
the ejection assembly comprises an ejection block contacted with the bottom surface of the clamping jaw, a telescopic rod fixedly connected with the ejection block and an ejection driving piece for controlling the extension length of the telescopic rod;
the material pressing mechanism comprises a material pressing rod and two protrusions fixed on the material pressing rod, and a first sensor and a second sensor for detecting the material pressing state are fixedly connected in the two protrusions respectively.
As a further scheme of the invention: the laser cladding mechanism comprises a laser cladding machine, a control assembly for adjusting the horizontal and vertical positions of the laser cladding machine and a second driving piece for driving the fixing piece to rotate.
As a further scheme of the invention: the laser cladding machine comprises a laser head for realizing laser cladding of the valve seat ring and a powder discharging part.
As a further scheme of the invention: the blanking mechanism comprises a receiving piece connected with the fixing piece through an inclined sliding table.
As a further scheme of the invention: the cleaning mechanism comprises a cleaning piece and a translation piece fixed with the cleaning piece.
Compared with the prior art, the invention has the beneficial effects that: the valve seat ring processing device is novel in structure, the processing device is provided with four stations through improvement of the valve seat ring processing device, the device for fixing the valve seat ring can jump to the next station through rotation until the valve seat ring passes through the four stations and is processed sequentially.
Drawings
FIG. 1 is a schematic view of a rotary component in a laser cladding apparatus;
FIG. 2 is a schematic view of a conveying assembly in a laser cladding apparatus;
FIG. 3 is a schematic view of a clamping assembly in a laser cladding apparatus;
FIG. 4 is a schematic cross-sectional view of a laser cladding mechanism in a laser cladding apparatus;
in the figure: 10-feeding components, 20-rotating mechanisms, 21-first working positions, 22-second working positions, 23-third working positions, 24-fourth working positions, 30 and pressing mechanisms; 31-swage rod, 32-first inductor, 33-second inductor, 34-jaw, 35-valve seat insert, 40-ejector assembly, 41-ejector block, 42-telescoping rod, 43-ejector drive.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the embodiment of the invention, the valve seat ring laser cladding device comprises a feeding assembly 10, wherein the feeding assembly 10 is used for conveying the valve seat ring to a processing station; the rotary mechanism 20 is used for fixing the valve seat ring and switching the processing stations of the valve seat ring through rotation, the rotary mechanism 20 comprises four fixing pieces for fixing the valve seat ring and a first driving piece for driving the fixing pieces to rotate, and the four fixing pieces correspond to the first working position 21, the second working position 22, the third working position 23 and the fourth working position 24 respectively; the processing assembly is correspondingly arranged on the processing station of the rotating mechanism 20, and comprises a pressing mechanism corresponding to the first working position 21, a laser cladding mechanism corresponding to the second working position 22, a discharging mechanism corresponding to the third working position 23 and a cleaning mechanism corresponding to the fourth working position 24.
As shown in fig. 2, the four fixing members each include three clamping jaws 34 uniformly arranged on the circumference, the lower ends of the fixing members are fixedly connected with a material ejection assembly 40, the material ejection assembly 40 pushes to one side of the clamping jaw 34, and a material ejection block 41 in the material ejection assembly 40 ejects the three clamping jaws 34 to form an unfolded state. The ejector assembly 40 comprises an ejector block 41 contacted with the bottom surface of the clamping jaw 34, a telescopic rod 42 fixedly connected with the ejector block 41, and an ejector driving piece 43 for controlling the extension length of the telescopic rod 42. The ejector block 41 is driven by the telescopic piece, and can lift the movable end of the clamping jaw 34 upwards, so that each clamping jaw 34 is in a certain inclined angle, and the three clamping jaws 34 are in an open state, so that the feeding mechanism can place the valve seat ring in the fixed piece, and the valve seat ring can be sequentially processed along with the movement of the rotating mechanism 20 to the next processing station.
As shown in fig. 2, the pressing mechanism is used for pressing the valve seat ring into the clamping jaw 34 for fixing, the pressing mechanism 30 includes a pressing rod 31 and two protrusions fixed on the pressing rod 31, and a first sensor 32 and a second sensor 33 for detecting the pressing state are respectively and fixedly connected in the two protrusions; when the pressing state of the pressing rod 31 to the valve seat ring is normal, the two groups of inductors cannot detect the protruding positions, the first inductor 32 and the second inductor 33 are turned off, and when the pressing state of the pressing rod 31 to the valve seat ring is abnormal, on one hand, the pressing distance of the pressing rod 31 is too long, and on the other hand, the first inductor 32 and the second inductor 33 can detect at least the protruding structures of one group of valve seat rings, and at least one inductor is turned on; when the pressed valve seat ring is inclined, the pressing distance of the pressing rod 31 is too short, and at least one sensor lamp is lighted; whether the sensor lamp is on or not judges the pressing effect of the pressing rod 31 on the valve seat ring.
Under the cooperation of the ejector assembly 40 and the pressing rod 31, the clamping and unfolding of the three clamping jaws 34 can be controlled, so that the fixation of the valve seat ring and the release of the fixation relationship are realized. In the actual use process, the movable ends of the three clamping jaws 34 are jacked up by the jacking rod, so that the three clamping jaws 34 are in an unfolding state with large upper openings and small lower openings, and the valve retainer is convenient to place in the three clamping jaws 34; the pressing mechanism can detect the pressing-in state of the valve seat ring on the one hand, and can detect the matching relation between the valve seat ring and the clamping jaw 34 in the process of fixing the valve seat ring. Under the action of the pressing rod 31, the unfolding state of the clamping jaw 34 can be adjusted to be a pressing state, so that the valve seat ring is fixed in the clamping jaw 34, and the accuracy of the fixed position of the valve seat ring in the clamping jaw 34 can be ensured.
The laser cladding mechanism comprises a laser cladding machine, a control assembly for adjusting the horizontal and vertical positions of the laser cladding machine and a second driving piece for driving the fixing piece to rotate; the laser cladding machine comprises a laser head for realizing laser cladding of the valve seat ring and a powder discharging part. In the actual use process, the valve seat ring is uniformly rotated under the action of the second driving piece, the powder discharging channel is opened, the laser is delayed to be opened, and then cladding operation is started, and under the action of the control component, the laser head is used for carrying out X-axis and Z-axis moving operation, and the valve seat ring is simultaneously rotated at a uniform speed, so that the laser cladding process is carried out in a spiral feeding state.
As shown in fig. 3, the blanking mechanism comprises a receiving piece connected with a fixed piece through an inclined sliding table; in the actual use process, the valve seat ring rotates from the laser cladding mechanism to the blanking mechanism, the ejector rod is ejected upwards, the three clamping jaws 34 are opened, and the valve seat ring slides into the material receiving device under the condition that the valve seat ring is subjected to natural gravity and impact force on the inclined sliding table.
The cleaning mechanism comprises a cleaning piece and a translation piece fixed with the cleaning piece, the cleaning piece can be, but is not limited to, a steel wire brush, when the fixing piece rotates from the blanking mechanism to the station of the cleaning mechanism, the steel wire brush moves forward to the position of the fixing piece under the drive of the translation piece, and the steel wire brush rotates to clean dust on the surface of the fixing piece, so that the fixing piece clamp is ensured to be clean, and secondary clamping is not influenced. The rotation time and the number of times of the wire brush can be set as parameters.
In the actual use process, the valve seat ring is conveyed to the lower end of the pressing piece through the feeding assembly 10, and the pressing piece is pressed down twice under the driving action of the telescopic piece, so that the product is ensured to be stably pressed into the clamp. The pressing mechanism is provided with two inductors, the two inductors comprehensively judge and judge the pressing state by detecting the positions of the tool, and when the upper inductor and the lower inductor are simultaneously unlit, the valve seat ring is indicated to be pressed normally, other display states of the inductors are regarded as abnormal pressing, the equipment stops to give an alarm, and the operation safety of the whole mechanism is ensured.
In the actual use process, the rotating mechanism 20 is driven by the first driving piece to rotate, in this embodiment, the rotating angle of the rotating mechanism 20 automatically runs the turntable for each time is 90 degrees, and a three-jaw clamp is installed on the rotating mechanism 20 at intervals of 30 degrees at equal intervals, and corresponds to the feeding station, the laser cladding station, the discharging station and the cleaning station respectively.
In the in-service use process, when the valve seat ring rotates to the laser cladding station, the valve seat ring realizes even rotation under the rotation of the second driving piece, the powder discharging channel is opened, the laser starts cladding operation after being delayed to be opened, and under the drive of the control component, the laser head can move in the horizontal and vertical directions, and the whole laser cladding process is performed in a spiral feeding state because the product rotates at a uniform speed at the same time.
In the actual use process, the valve seat ring rotates to the blanking assembly, the ejection cylinder ejects upwards, the three claws of the clamp are opened, and the product slides into the receiving device under the conditions of natural gravity and impact force of the upper hand of the inclined sliding table.
In the in-service use, mounting (three-jaw anchor clamps) on the rotating member rotate to clearance subassembly department, and the wire brush in the clearance subassembly advances to the anchor clamps position under the translation piece drive, and the dust on anchor clamps surface is cleared up in the wire brush rotation, ensures that anchor clamps are clean, does not influence the secondary clamping, and the wire brush rotation time and number of times all can carry out parameter setting, and the flexibility of use is strong.
The valve seat ring processing device is novel in structure and stable in operation, the processing device is provided with four stations through improvement of the valve seat ring processing device, the device for fixing the valve seat ring can jump to the next station through rotation until the valve seat ring passes through the four stations and is processed, and compared with the valve seat ring processing device in the prior art, the valve seat ring processing device is concentrated in each processing assembly, the switching of the processing stations can be realized through rotating the device for fixing the valve seat ring, the connecting conveying piece between the original stations is omitted to a certain extent, the occupied space of the whole processing device is saved, and the processing efficiency is improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (5)
1. A valve seat insert laser cladding apparatus, comprising:
the feeding assembly is used for conveying the valve seat ring to a processing station;
the rotary mechanism is used for fixing the valve seat ring and switching the processing stations of the valve seat ring through rotation, and comprises four fixing pieces for fixing the valve seat ring and a first driving piece for driving the fixing pieces to rotate, wherein the four fixing pieces correspond to a first working position, a second working position, a third working position and a fourth working position respectively, and
the processing assembly is correspondingly arranged on the processing station of the rotating mechanism and comprises a pressing mechanism corresponding to the first working position, a laser cladding mechanism corresponding to the second working position, a discharging mechanism corresponding to the third working position and a cleaning mechanism corresponding to the fourth working position;
the four fixing pieces comprise three clamping jaws which are uniformly arranged on the circumference, and the lower ends of the fixing pieces are fixedly connected with a material ejection assembly;
the ejection assembly comprises an ejection block contacted with the bottom surface of the clamping jaw, a telescopic rod fixedly connected with the ejection block and an ejection driving piece for controlling the extension length of the telescopic rod;
the material pressing mechanism comprises a material pressing rod and two protrusions fixed on the material pressing rod, and a first sensor and a second sensor for detecting the material pressing state are fixedly connected in the two protrusions respectively.
2. The valve seat ring laser cladding device according to claim 1, wherein the laser cladding mechanism comprises a laser cladding machine, a control assembly for adjusting the horizontal and vertical positions of the laser cladding machine, and a second driving member for driving the fixing member to rotate.
3. The valve seat ring laser cladding device according to claim 2, wherein the laser cladding machine comprises a laser head for realizing valve seat ring laser cladding and a powder discharging part.
4. The valve seat ring laser cladding device according to claim 1, wherein the blanking mechanism comprises a receiving member connected with the fixing member through an inclined sliding table.
5. The valve seat insert laser cladding apparatus of claim 1, wherein the cleaning mechanism comprises a cleaning member and a translating member secured to the cleaning member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211052663.9A CN115341211B (en) | 2022-08-31 | 2022-08-31 | Valve seat ring laser cladding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211052663.9A CN115341211B (en) | 2022-08-31 | 2022-08-31 | Valve seat ring laser cladding device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115341211A CN115341211A (en) | 2022-11-15 |
| CN115341211B true CN115341211B (en) | 2023-12-08 |
Family
ID=83955261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211052663.9A Active CN115341211B (en) | 2022-08-31 | 2022-08-31 | Valve seat ring laser cladding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115341211B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008188648A (en) * | 2007-02-06 | 2008-08-21 | Toyota Motor Corp | Laser cladding method and apparatus |
| CN104874793A (en) * | 2015-05-27 | 2015-09-02 | 机械科学研究总院先进制造技术研究中心 | Three-dimensional printing direct manufacturing method of engine cylinder head valve seat |
| CN106148950A (en) * | 2016-08-26 | 2016-11-23 | 阳江东华激光智能科技有限公司 | Laser melting coating work station cut by five metals cutter |
| CN209493028U (en) * | 2018-12-29 | 2019-10-15 | 安庆帝伯粉末冶金有限公司 | A kind of valve retainer overturning arranging apparatus |
| CN110374755A (en) * | 2019-06-18 | 2019-10-25 | 浙江吉利控股集团有限公司 | A kind of laser cladding method of cylinder head, engine and valve retainer |
| CN112410780A (en) * | 2020-11-17 | 2021-02-26 | 安庆帝伯粉末冶金有限公司 | Laser cladding valve seat ring and manufacturing method thereof |
| CN213257095U (en) * | 2020-08-31 | 2021-05-25 | 安庆帝伯粉末冶金有限公司 | Valve seat ring forming device |
| CN213730034U (en) * | 2020-10-29 | 2021-07-20 | 山东领品机械科技有限公司 | Automatic feeding device of full-automatic laser pipe cutting machine |
| CN215699477U (en) * | 2021-09-27 | 2022-02-01 | 浙江勇峰智能科技有限公司 | Automatic installation device for gear box fixed block component |
| CN215890126U (en) * | 2021-08-27 | 2022-02-22 | 仪征市昌达粉末冶金制品有限公司 | Laser cladding valve seat ring |
| CN114481116A (en) * | 2021-10-21 | 2022-05-13 | 北京机科国创轻量化科学研究院有限公司烟台分公司 | Device and method for laser cladding of valve seat |
| CN114850685A (en) * | 2022-04-22 | 2022-08-05 | 泉州冰点科技有限公司 | Multi-station 3D vision laser processing equipment |
-
2022
- 2022-08-31 CN CN202211052663.9A patent/CN115341211B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008188648A (en) * | 2007-02-06 | 2008-08-21 | Toyota Motor Corp | Laser cladding method and apparatus |
| CN104874793A (en) * | 2015-05-27 | 2015-09-02 | 机械科学研究总院先进制造技术研究中心 | Three-dimensional printing direct manufacturing method of engine cylinder head valve seat |
| CN106148950A (en) * | 2016-08-26 | 2016-11-23 | 阳江东华激光智能科技有限公司 | Laser melting coating work station cut by five metals cutter |
| CN209493028U (en) * | 2018-12-29 | 2019-10-15 | 安庆帝伯粉末冶金有限公司 | A kind of valve retainer overturning arranging apparatus |
| CN110374755A (en) * | 2019-06-18 | 2019-10-25 | 浙江吉利控股集团有限公司 | A kind of laser cladding method of cylinder head, engine and valve retainer |
| CN213257095U (en) * | 2020-08-31 | 2021-05-25 | 安庆帝伯粉末冶金有限公司 | Valve seat ring forming device |
| CN213730034U (en) * | 2020-10-29 | 2021-07-20 | 山东领品机械科技有限公司 | Automatic feeding device of full-automatic laser pipe cutting machine |
| CN112410780A (en) * | 2020-11-17 | 2021-02-26 | 安庆帝伯粉末冶金有限公司 | Laser cladding valve seat ring and manufacturing method thereof |
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| CN215699477U (en) * | 2021-09-27 | 2022-02-01 | 浙江勇峰智能科技有限公司 | Automatic installation device for gear box fixed block component |
| CN114481116A (en) * | 2021-10-21 | 2022-05-13 | 北京机科国创轻量化科学研究院有限公司烟台分公司 | Device and method for laser cladding of valve seat |
| CN114850685A (en) * | 2022-04-22 | 2022-08-05 | 泉州冰点科技有限公司 | Multi-station 3D vision laser processing equipment |
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| Publication number | Publication date |
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| CN115341211A (en) | 2022-11-15 |
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