CN114260489B - Milling machine for fine machining of hardware stamping parts - Google Patents
Milling machine for fine machining of hardware stamping parts Download PDFInfo
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- CN114260489B CN114260489B CN202111581234.6A CN202111581234A CN114260489B CN 114260489 B CN114260489 B CN 114260489B CN 202111581234 A CN202111581234 A CN 202111581234A CN 114260489 B CN114260489 B CN 114260489B
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- milling machine
- fixed seat
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- 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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a milling machine for fine machining of a hardware stamping part, which comprises a milling machine main body: the workbench is arranged in the middle of the milling machine main body; the mounting bracket is fixedly connected to the front side of the workbench; the fixed seat is fixedly connected to the upper end surface of the workbench, and a slope-shaped notch is formed in the right side of the fixed seat; the motor is arranged on the right side of the upper end of the mounting bracket; the upper end of the belt transmission mechanism and the shaft end of the motor form a key connection structure, and the upper end of the belt transmission mechanism and the mounting bracket form a bearing connection structure; and the residual tooth gear is fixedly connected to the left side of the belt transmission mechanism. This fine processing of five metals stamping workpiece is with milling machine can be convenient for automatic unloading to the work piece that processing was accomplished, simultaneously automatic will wait to process the work piece fixed in the assigned position, the follow-up processing of being convenient for has improved machining efficiency and processingquality greatly, has reduced staff's intensity of labour simultaneously.
Description
Technical Field
The invention relates to the technical field of finish machining of hardware stamping parts, in particular to a milling machine for finish machining of hardware stamping parts.
Background
The hardware stamping part is a small standard part which is processed by adopting steel or some nonferrous metals as raw materials in a cold/hot stamping mode, and in certain occasions with higher requirements on use precision, the hardware stamping part needs to be further finished by a milling machine after stamping.
However, because the volume of the hardware stamping part is usually smaller, the finishing processing time is shorter, and therefore, workers are required to continuously reinstall the detached workpiece, the labor intensity of the workers is greatly improved, the position uniformity of the hardware stamping part is ensured when the hardware stamping part is installed, the subsequent tool setting is not required, and particularly, the circular hardware stamping part enables the workers to have slower speed when positioning and installing the hardware stamping part, so that the working efficiency is greatly reduced.
Disclosure of Invention
The invention aims to provide a milling machine for fine machining of a hardware stamping part, which aims to solve the problem that the existing hardware stamping part is inconvenient to repeatedly install a workpiece during machining of the milling machine in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions: a milling machine for fine machining of a hardware stamping part comprises a milling machine main body:
the workbench is arranged in the middle of the milling machine main body;
the mounting bracket is fixedly connected to the front side of the workbench;
the fixed seat is fixedly connected to the upper end surface of the workbench, and a slope-shaped notch is formed in the right side of the fixed seat;
the motor is arranged on the right side of the upper end of the mounting bracket;
the upper end of the belt transmission mechanism and the shaft end of the motor form a key connection structure, and the upper end of the belt transmission mechanism and the mounting bracket form a bearing connection structure;
the residual tooth gear is fixedly connected to the left side of the belt transmission mechanism;
a transmission gear provided on the front side of the stub gear;
the right end of the transmission shaft and the transmission gear form a key connection structure;
a driving plate fixedly connected to the left end of the transmission shaft;
a shift lever fixedly connected to a left side surface of the dial;
the pushing mechanism is arranged on the upper side of the mounting bracket, and the front end of the pushing mechanism and the deflector rod form a sliding connection structure;
the storage mechanism is arranged at the front side of the fixed seat, and the lower end of the storage mechanism is fixedly connected to the upper side of the mounting bracket;
the rotary table is arranged in the middle of the upper end of the fixed seat, and the lower end of the rotary table and the inner side of the fixed seat form a bearing connection structure;
the worm wheel is fixedly connected to the lower end of the rotary table;
the worm is meshed with the front side of the worm wheel, two ends of the worm form a bearing connection structure with the fixing seat, and the right end of the worm is connected with the lower end of the belt transmission mechanism;
the movable claws are uniformly distributed on the outer side of the turntable in a circumferential mode, and form a sliding connection structure with the turntable;
the fixed clamping claws are uniformly distributed on the outer side of the turntable in a circumferential mode, and form a fixed connection structure with the turntable;
the tension springs are arranged on two sides of the movable claw, one ends of the tension springs are connected with the movable claw, and the other ends of the tension springs are connected with the turntable;
and the cam is fixedly connected with the middle part of the inner side of the fixed seat.
By adopting the technical scheme, the pushing mechanism can be driven by the motor to move, so that the pushing mechanism pushes the workpiece to be processed in the storage mechanism onto the fixed seat, meanwhile, the motor drives the rotary table to rotate, the rotary table stretches out and draws back through the cooperation of the movable claw and the cam when rotating, then the workpiece is grabbed and loosened through the cooperation of the movable claw and the fixed claw, automatic feeding, fixing and discharging of the workpiece are realized, the operation steps of workers are greatly simplified, and the processing efficiency is improved.
Preferably, the stub gear is coaxial with the belt drive mechanism, and the stub gear is meshed with the drive gear.
By adopting the technical scheme, the pushing mechanism can only move at a proper time through the cooperation of the residual tooth gear and the transmission gear, so that the linkage operation with the clamping part is realized, and the pushing mechanism only operates once when the turntable rotates for 90 degrees.
Preferably, the pushing mechanism comprises:
the pushing rod is connected to the upper side of the mounting bracket in a sliding manner;
the driving frame is fixedly connected to the front end of the pushing rod, and the driving frame and the shifting rod form a sliding connection structure.
Preferably, the structure shape of the pushing rod is Y-shaped, the section shape of the pushing rod is square, and the pushing rod and the driving frame form a T-shaped structure.
By adopting the technical scheme, the circular workpiece can be positioned through the Y-shaped structure of the pushing rod, the workpiece is prevented from finding offset in the pushing engineering, and meanwhile, the influence on the upper and lower directions of the pushing rod in the circumferential movement of the pushing rod is eliminated through the matching of the driving frame and the pushing rod, so that the pushing rod can stably perform linear reciprocating movement.
Preferably, the storage mechanism comprises:
the storage rack is fixedly connected to the upper side of the mounting bracket;
the guide frame is arranged at the lower end of the front side of the material storage frame, and the guide frame and the mounting bracket form a fixed connection structure.
Preferably, a discharging opening is formed in the rear side of the lower end of the storage rack, the guide rack and the pushing rod form a nested connection structure, and the inner side profile shape of the guide rack is matched with the structural shape of the pushing rod.
By adopting the technical scheme, the guide frame can limit the pushing rod, so that the pushing rod is prevented from rotating during movement, and meanwhile, the stability of the pushing rod during movement is improved.
Preferably, the movable claw includes:
the telescopic rods and the turntables form a sliding connection structure;
the clamping plates are fixedly connected to the outer ends of the telescopic rods;
and the rotating sleeves and the inner ends of the telescopic rods form bearing connection structures.
Preferably, the structure shape of the clamping plate is V-shaped, the structure and the position of the clamping plate are matched with the fixed clamping jaw, and the rotating sleeve and the cam form a sliding connection structure.
By adopting the technical scheme, the circular workpiece can be conveniently positioned by the V-shaped structure of the clamping plate and the cooperation of the fixed clamping jaw, the position uniformity of the workpiece during fixing is improved, and the processing quality is ensured.
Compared with the prior art, the invention has the beneficial effects that: this fine processing of five metals stamping workpiece is with milling machine can be convenient for automatic unloading to the work piece that processing was accomplished, simultaneously automatic will wait to process the work piece and fix in the assigned position, the follow-up processing of being convenient for has improved machining efficiency and processingquality greatly, has reduced staff's intensity of labour simultaneously:
1. the movable claw and the cam are matched when the turntable rotates, so that the movable claw automatically stretches, and then the workpiece is clamped and loosened through the matching of the movable claw and the fixed claw, and finally, the automatic feeding and discharging operations of the movable claw and the fixed claw are completed when the movable claw and the fixed claw rotate, thereby greatly improving the efficiency when the workpiece is clamped, improving the processing efficiency and reducing the labor intensity of workers;
2. the workpiece inside the storage mechanism is pushed out through the pushing mechanism, so that the workpiece to be processed can be taken out by the fixed clamping jaw and the movable clamping jaw in the rotation process, automatic feeding operation is realized, and only a worker is required to put the workpiece to be processed into the storage mechanism, so that the operation steps of the worker are greatly simplified.
Drawings
FIG. 1 is a schematic view of the overall three-dimensional structure of the present invention;
FIG. 2 is an enlarged schematic view of the structure of the point A in FIG. 1 according to the present invention;
FIG. 3 is a schematic view of a partial perspective structure of the present invention;
FIG. 4 is an enlarged schematic view of the structure of the point B in FIG. 3 according to the present invention;
FIG. 5 is a schematic top view of the present invention;
FIG. 6 is a schematic view of the cross-sectional structure of the U-U of the present invention;
FIG. 7 is an enlarged schematic view of the structure of the C point in FIG. 6 according to the present invention;
FIG. 8 is a schematic view of the structure of the present invention at V-V in section;
FIG. 9 is a schematic view of the cross-sectional structure at W-W of the present invention;
fig. 10 is an enlarged view of the structure of the point D in fig. 9 according to the present invention.
In the figure: 1. a milling machine body; 2. a work table; 3. a mounting bracket; 4. a fixing seat; 5. a motor; 6. a belt drive mechanism; 7. a stub gear; 8. a transmission gear; 9. a transmission shaft; 10. a dial; 11. a deflector rod; 12. a pushing mechanism; 1201. a pushing rod; 1202. a drive frame; 13. a storage mechanism; 1301. a storage rack; 1302. a guide frame; 14. a turntable; 15. a worm wheel; 16. a worm; 17. a movable claw; 1701. a telescopic rod; 1702. a clamping plate; 1703. a rotating sleeve; 18. a fixed claw; 19. a tension spring; 20. a cam.
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.
Referring to fig. 1-10, the present invention provides a technical solution: the utility model provides a milling machine is used in fine processing of five metals stamping workpiece, includes milling machine main part 1:
a table 2 provided in the middle of the milling machine body 1;
a mounting bracket 3 fixedly connected to the front side of the table 2;
the fixed seat 4 is fixedly connected to the upper end surface of the workbench 2, and a slope-shaped notch is formed in the right side of the fixed seat 4;
a motor 5 mounted on the right side of the upper end of the mounting bracket 3;
the upper end of the belt transmission mechanism 6 and the shaft end of the motor 5 form a key connection structure, and the upper end of the belt transmission mechanism 6 and the mounting bracket 3 form a bearing connection structure;
a stub gear 7 fixedly connected to the left side of the belt transmission mechanism 6; the stub gear 7 is coaxial with the belt transmission mechanism 6, and the stub gear 7 is meshed with the transmission gear 8.
A transmission gear 8 provided on the front side of the stub gear 7;
the two ends of the transmission shaft 9 form a bearing connection structure with the mounting bracket 3, and the right end of the transmission shaft 9 and the transmission gear 8 form a key connection structure;
a dial 10 fixedly connected to the left end of the drive shaft 9;
a shift lever 11 fixedly connected to the left side surface of the dial 10;
the pushing mechanism 12 is arranged on the upper side of the mounting bracket 3, and the front end of the pushing mechanism 12 and the deflector rod 11 form a sliding connection structure; the pushing device 12 comprises: a pusher 1201 slidably connected to the upper side of the mounting bracket 3; a driving frame 1202 fixedly connected to the front end of the pushing rod 1201, the driving frame 1202 and the driving rod 11 forming a sliding connection structure; the structure shape of the pushing rod 1201 is Y-shaped, the section shape of the pushing rod 1201 is square, the pushing rod 1201 and the driving frame 1202 form a T-shaped structure, the motor 5 is started, the motor 5 drives the worm 16 to rotate through the belt transmission mechanism 6, meanwhile, the transmission gear 8 is driven to rotate through the residual tooth gear 7, the transmission gear 8 drives the driving plate 10 to rotate through the transmission shaft 9, and the pushing rod 1201 is driven to linearly reciprocate through the cooperation of the driving rod 11 and the driving frame 1202 when the driving plate 10 rotates.
The storage mechanism 13 is arranged at the front side of the fixed seat 4, and the lower end of the storage mechanism 13 is fixedly connected with the upper side of the mounting bracket 3; the storage mechanism 13 comprises: a magazine 1301 fixedly connected to the upper side of the mounting bracket 3; a guide frame 1302, which is disposed at the front lower end of the material storage frame 1301, wherein the guide frame 1302 and the mounting frame 3 form a fixed connection structure; the rear side of the lower end of the material storage frame 1301 is provided with a discharge opening, the guide frame 1302 and the material pushing rod 1201 form a nested connection structure, the inner side contour shape of the guide frame 1302 is matched with the structural shape of the material pushing rod 1201, the material pushing rod 1201 pushes out the workpieces to be processed stacked in the material storage frame 1301 in the process of linear reciprocating motion, then the material pushing rod 1201 is reset, and the workpieces in the material storage frame 1301 fall down through the bottom layer of gravity to wait for the next pushing motion.
The turntable 14 is arranged in the middle of the upper end of the fixed seat 4, and the lower end of the turntable 14 and the inner side of the fixed seat 4 form a bearing connection structure;
a worm wheel 15 fixedly connected to the lower end of the turntable 14;
the worm 16 is meshed with the front side of the worm wheel 15, both ends of the worm 16 and the fixed seat 4 form a bearing connection structure, and the right end of the worm 16 is connected with the lower end of the belt transmission mechanism 6;
the movable claws 17 are uniformly distributed on the outer side of the turntable 14 in a circumferential mode, and the movable claws 17 and the turntable 14 form a sliding connection structure; the movable claw 17 comprises: a telescopic rod 1701, which forms a sliding connection structure with the turntable 14; clamping plates 1702 fixedly connected to the outer ends of the telescopic rods 1701; a rotor 1703, which forms a bearing connection structure with the inner end of the telescopic rod 1701; the structure of the clamping plate 1702 is V-shaped, the structure and position of the clamping plate 1702 are matched with the fixed jaw 18, the rotating sleeve 1703 and the cam 20 form a sliding connection structure, and the worm 16 drives the turntable 14 to rotate through the matching with the worm wheel 15 during rotation.
The fixed claws 18 are uniformly distributed on the outer side of the turntable 14 in a circumferential mode, and the fixed claws 18 and the turntable 14 form a fixed connection structure;
the tension springs 19 are arranged on two sides of the movable claw 17, one end of each tension spring 19 is connected with the movable claw 17, and the other end of each tension spring 19 is connected with the rotary table 14;
the cam 20, it is fixed connection in the inboard middle part of fixing base 4, carousel 14 rotates and drives movable jack catch 17 through the cooperation of change 1703 with cam 20 and stretches out and draws back in carousel 14 inboard, the movable jack catch 17 of rear side and fixed jack catch 18 carry the work piece of processing completion clockwise, along with the outside profile of cam 20, movable jack catch 17 of rear side is gradually inwards contracted under the effect of extension spring 19, the feeding mechanism 12 is accomplished to the movable jack catch 17 when rotating to approximately half the journey, then movable jack catch 17 of rear side rotates to the right side of fixing base 4, movable jack catch 17 is fully released at this moment, the work piece of its inboard falls down along the breach on the right side of fixing base 4, and the fixed jack catch 18 of original right side is rotated to the front side and is overlapped the work piece that just will push out, at this moment, the fixed jack catch 18 of original in the front side then is rotated to the left side of fixing base 4 with the work piece that waits to push out last time, and along with the profile shape of cam 20 makes movable jack catch 17 gradually inwards shrink, the work piece is pressed from top to fixing, clamp the work piece, clamp fixing, the work piece originally, the work piece of fixing in the left side of fixing clamp the work piece with the work piece of fixing clamp the work piece of fixing 18 of fixing to the left side of fixing base 4 and the work piece of side is rotated to clamp the work piece position of the work piece of the side.
It is to be understood that the terms "center," "longitudinal," "transverse," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the scope of the invention.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a fine processing of five metals stamping workpiece is with milling machine, includes milling machine main part, its characterized in that:
the workbench is arranged in the middle of the milling machine main body;
the mounting bracket is fixedly connected to the front side of the workbench;
the fixed seat is fixedly connected to the upper end surface of the workbench, and a slope-shaped notch is formed in the right side of the fixed seat;
the motor is arranged on the right side of the upper end of the mounting bracket;
the upper end of the belt transmission mechanism and the shaft end of the motor form a key connection structure, and the upper end of the belt transmission mechanism and the mounting bracket form a bearing connection structure;
the residual tooth gear is fixedly connected to the left side of the belt transmission mechanism;
a transmission gear provided on the front side of the stub gear;
the right end of the transmission shaft and the transmission gear form a key connection structure;
a driving plate fixedly connected to the left end of the transmission shaft;
a shift lever fixedly connected to a left side surface of the dial;
the pushing mechanism is arranged on the upper side of the mounting bracket, and the front end of the pushing mechanism and the deflector rod form a sliding connection structure;
the storage mechanism is arranged at the front side of the fixed seat, and the lower end of the storage mechanism is fixedly connected to the upper side of the mounting bracket;
the rotary table is arranged in the middle of the upper end of the fixed seat, and the lower end of the rotary table and the inner side of the fixed seat form a bearing connection structure;
the worm wheel is fixedly connected to the lower end of the rotary table;
the worm is meshed with the front side of the worm wheel, two ends of the worm form a bearing connection structure with the fixing seat, and the right end of the worm is connected with the lower end of the belt transmission mechanism;
the movable claws are uniformly distributed on the outer side of the turntable in a circumferential mode, and form a sliding connection structure with the turntable;
the fixed clamping claws are uniformly distributed on the outer side of the turntable in a circumferential mode, and form a fixed connection structure with the turntable;
the tension springs are arranged on two sides of the movable claw, one ends of the tension springs are connected with the movable claw, and the other ends of the tension springs are connected with the turntable;
the cam is fixedly connected to the middle part of the inner side of the fixed seat;
the pushing equipment includes:
the pushing rod is connected to the upper side of the mounting bracket in a sliding manner;
the driving frame is fixedly connected to the front end of the pushing rod, and the driving frame and the deflector rod form a sliding connection structure;
the residual tooth gear is coaxial with the belt transmission mechanism, and is meshed with the transmission gear;
the movable claw comprises:
the telescopic rods and the turntables form a sliding connection structure;
the clamping plates are fixedly connected to the outer ends of the telescopic rods;
the rotating sleeves and the inner ends of the telescopic rods form bearing connection structures;
the structure shape of the clamping plate is V-shaped, the structure and the position of the clamping plate are matched with the fixed clamping jaw, and the rotating sleeve and the cam form a sliding connection structure.
2. The milling machine for fine machining of hardware stamping parts according to claim 1, wherein: the structure shape of the pushing rod is Y-shaped, the section shape of the pushing rod is square, and the pushing rod and the driving frame form a T-shaped structure.
3. The milling machine for fine machining of hardware stamping parts according to claim 1, wherein: the storage mechanism comprises:
the storage rack is fixedly connected to the upper side of the mounting bracket;
the guide frame is arranged at the lower end of the front side of the material storage frame, and the guide frame and the mounting bracket form a fixed connection structure.
4. A milling machine for fine processing of a hardware stamping part according to claim 3, characterized in that: the rear side of the lower end of the material storage frame is provided with a discharge opening, the guide frame and the material pushing rod form a nested connection structure, and the shape of the inner side profile of the guide frame is matched with the structural shape of the material pushing rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111581234.6A CN114260489B (en) | 2021-12-22 | 2021-12-22 | Milling machine for fine machining of hardware stamping parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111581234.6A CN114260489B (en) | 2021-12-22 | 2021-12-22 | Milling machine for fine machining of hardware stamping parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114260489A CN114260489A (en) | 2022-04-01 |
| CN114260489B true CN114260489B (en) | 2023-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111581234.6A Active CN114260489B (en) | 2021-12-22 | 2021-12-22 | Milling machine for fine machining of hardware stamping parts |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB181311A (en) * | 1921-06-10 | 1922-11-09 | Hubert Dalton | Improvements in combined lathe, drilling and milling machines |
| CN106425660A (en) * | 2016-09-30 | 2017-02-22 | 张剑光 | Milling machine with automatic material feeding device |
| TWM561584U (en) * | 2017-11-28 | 2018-06-11 | Zhuan Bao Industry Co Ltd | Double head lathe structure improvement |
| CN208628887U (en) * | 2018-04-28 | 2019-03-22 | 贵州金鹏富风机制造有限公司 | A kind of vertical liftable rotary milling machine |
| CN110961704A (en) * | 2019-12-23 | 2020-04-07 | 徐州黑白龙工程尼龙有限公司 | Milling machine equipment for preparing automobile parts |
| CN211387708U (en) * | 2019-12-31 | 2020-09-01 | 莱芜市万方煤矿机械有限公司 | Spline milling machine for processing chain wheel shaft |
| CN112551143A (en) * | 2020-12-02 | 2021-03-26 | 王燊 | Automatic loading and unloading device of bearing ring double-arm manipulator |
-
2021
- 2021-12-22 CN CN202111581234.6A patent/CN114260489B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB181311A (en) * | 1921-06-10 | 1922-11-09 | Hubert Dalton | Improvements in combined lathe, drilling and milling machines |
| CN106425660A (en) * | 2016-09-30 | 2017-02-22 | 张剑光 | Milling machine with automatic material feeding device |
| TWM561584U (en) * | 2017-11-28 | 2018-06-11 | Zhuan Bao Industry Co Ltd | Double head lathe structure improvement |
| CN208628887U (en) * | 2018-04-28 | 2019-03-22 | 贵州金鹏富风机制造有限公司 | A kind of vertical liftable rotary milling machine |
| CN110961704A (en) * | 2019-12-23 | 2020-04-07 | 徐州黑白龙工程尼龙有限公司 | Milling machine equipment for preparing automobile parts |
| CN211387708U (en) * | 2019-12-31 | 2020-09-01 | 莱芜市万方煤矿机械有限公司 | Spline milling machine for processing chain wheel shaft |
| CN112551143A (en) * | 2020-12-02 | 2021-03-26 | 王燊 | Automatic loading and unloading device of bearing ring double-arm manipulator |
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| Publication number | Publication date |
|---|---|
| CN114260489A (en) | 2022-04-01 |
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