CN112475367B - Drilling and screwing machine for hidden anti-theft net profile - Google Patents
Drilling and screwing machine for hidden anti-theft net profile Download PDFInfo
- Publication number
- CN112475367B CN112475367B CN202011323937.4A CN202011323937A CN112475367B CN 112475367 B CN112475367 B CN 112475367B CN 202011323937 A CN202011323937 A CN 202011323937A CN 112475367 B CN112475367 B CN 112475367B
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- screw
- drilling
- driving
- push rod
- face
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- 238000005553 drilling Methods 0.000 title claims abstract description 68
- 239000000463 material Substances 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims abstract description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 16
- 238000004080 punching Methods 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims 1
- 230000007246 mechanism Effects 0.000 abstract description 2
- 229910000838 Al alloy Inorganic materials 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 13
- 229910052782 aluminium Inorganic materials 0.000 description 13
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B39/00—General-purpose boring or drilling machines or devices; Sets of boring and/or drilling machines
- B23B39/16—Drilling machines with a plurality of working-spindles; Drilling automatons
- B23B39/161—Drilling machines with a plurality of working-spindles; Drilling automatons with parallel work spindles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/001—Article feeders for assembling machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/001—Article feeders for assembling machines
- B23P19/007—Picking-up and placing mechanisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
- B23P19/06—Screw or nut setting or loosening machines
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
The invention discloses a drilling and screwing machine for a hidden anti-theft net section bar, which comprises an equipment bin body, a screwing and decelerating integrated machine and a material bearing bin, wherein a driving push rod I is arranged above the equipment bin body, the front end surface of the driving push rod I is connected with the drilling and decelerating integrated machine, a stepping motor is arranged in front of the equipment bin body, a limit baffle is arranged on the right side of the stepping motor, a screw rod transmission table is arranged on the right side of the limit baffle, the screwing and decelerating integrated machine is arranged on the right side of the drilling and decelerating integrated machine, a screw bearing body is arranged on the lower end surface of the screwing and decelerating integrated machine, and equipment is arranged in front of the screw rod transmission table. This drilling and screw driving machine wholly adopts full-automatic mechanism structure, replaces traditional manual work to punch and screw driving operation to long banding aluminium alloy, very big use manpower sparingly, and have stronger working quality and work efficiency, only need the person guard be responsible for go up the unloading can, very light.
Description
Technical Field
The invention relates to the technical field of anti-theft net processing, in particular to a drilling and screwing machine for hidden anti-theft net profiles.
Background
The stealth anti-theft net steel wire is a type of anti-theft net, is not stealth, but adopts a standard interval of 5 cm and a steel wire with a tensile force bearing capacity of more than 110 kg of a single steel wire, and determines that protection and anti-falling objects are the most basic functions. Invisible anti-theft net is generally divided into 2 types, one is 2 frame type (needing field installation) and the other is 4 frame type (needing no field installation), and both the 2 frame type and the 4 frame type are formed by aluminum profiles, and screws are required to be punched on the aluminum profiles for drawing steel wires.
At present, the popular screw driving method is to manually drive screws one by one onto the section bar, the speed is very slow, the labor intensity of workers is high, and therefore, a drilling screw driving machine for hidden anti-theft net section bars is provided.
Disclosure of Invention
The invention aims to provide a drilling and screwing machine for a hidden anti-theft net section bar, which solves the problems that the traditional and popular screwing method is to manually screw screws one by one onto the section bar, the speed is very slow, and the labor intensity of workers is high.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a screw machine is beaten in drilling for hidden anti-theft net section bar, includes the equipment storehouse body, beats screw speed reduction all-in-one and material and bear the storehouse, the drive push rod is installed to the top of the equipment storehouse body, and the preceding terminal surface of drive push rod is connected with the integrative speed reducer of drilling, the place ahead of the equipment storehouse body is provided with step motor, and step motor's right side is provided with limit baffle, screw drive platform is installed on limit baffle's right side, beat screw speed reduction all-in-one and install in the right side of the integrative speed reducer of drilling, and beat screw speed reduction all-in-one's lower terminal surface and install the screw carrier, screw drive platform's the place ahead is provided with between the equipment, the material bears the storehouse and installs in the right side between the equipment, and the right side that the material born the storehouse is provided with operation mesa.
Preferably, a drilling bearing plate is connected to the lower side of the drilling integrated speed reducer, a drilling pipe orifice is arranged below the drilling bearing plate, and a drilling needle head is arranged on the lower end face of the drilling pipe orifice.
Preferably, the drilling integrated speed reducer forms a telescopic structure with the equipment bin body by driving the first push rod, the drilling pipe orifices are horizontally distributed at intervals on the lower end face of the drilling bearing plate, and the drilling needle heads and the lower ports of the drilling pipe orifices form a detachable structure by sleeving.
Preferably, a gripper clamp is arranged on the front end face of the screw carrier, a punching screw is arranged on the front port of the gripper clamp, and a driving push rod II is arranged on the right side of the driving push rod I.
Preferably, the screw driving and speed reducing integrated machine forms a telescopic structure with the equipment bin body through the driving push rod II, and the screw supporting body forms a rotating structure through the screw driving and speed reducing integrated machine and the gripper clamp, and the screw supporting body is positioned on the horizontal interval distribution of the lower end face of the screw driving and speed reducing integrated machine.
Preferably, a supporting frame is arranged below the stepping motor, a double-rail vibration disc is arranged behind the operation table surface, and a display main screen is arranged on the right side of the second driving push rod.
Preferably, the appearance structure of the material bearing bin is disc-shaped, and the equipment room penetrates through the upper end face of the supporting frame.
Preferably, the rear of the double-rail vibration disc is provided with a movable table top, the rear of the movable table top is provided with a servo driving table, and a screw tray is arranged above the servo driving table.
Preferably, the screw tray is movably connected with the upper end surface of the servo driving table, and the operation table surface and the double-rail vibration plate are positioned on the same horizontal direction.
Preferably, the screw bearing holes penetrate through the screw tray, the pushing air cylinder is attached to the rear end face of the screw tray, a telescopic structure is formed between the pushing air cylinder and the screw tray through the servo driving table, and the screw bearing holes are distributed on the upper end face of the screw tray at equal intervals.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention integrally adopts a full-automatic mechanism structure, replaces the traditional manual punching and screwing operation on the long aluminum profile, greatly saves labor, has stronger working quality and working efficiency, and can be easily carried out by only needing one person to watch for loading and unloading;
2. according to the invention, the drilling pipe orifice is utilized to punch the surface of the aluminum profile before screwing, so that the screwing quality is improved, each group of drilling needles can be disassembled, different apertures are replaced according to the punching requirement, the applicability is high, the mechanical performance is very high in cooperation with precision, and the maintenance is convenient;
3. according to the invention, the screw rod transmission table is driven by the stepping motor, so that the borne aluminum profile can stably move towards the inside of the equipment, manual movement is not needed, the movement is more stable, potential safety hazards are avoided, and the use is convenient;
4. according to the invention, the clamping claw clamp is utilized for automatically clamping, and the stainless steel screw and the iron screw with films can be clamped, so that the biggest problems that the stainless steel cannot be sucked and the magnet is easy to damage when the magnet is used for sucking the screw in the prior art are solved;
5. according to the invention, by utilizing the functions of the servo driving table and the propelling cylinder, the screw tray can be adjusted in the transverse direction at the upper position of the movable table top, and meanwhile, the screw bearing holes after movement and each group of double-rail vibration discs are positioned in the same vertical direction, so that the operation accuracy is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic side view of the present invention;
FIG. 4 is a schematic view of the screw tray of the present invention;
fig. 5 is a schematic view of the structure of the operation table of the present invention.
In the figure: 1. an equipment bin body; 2. driving a first push rod; 3. drilling an integrated speed reducer; 4. drilling a bearing plate; 5. drilling a pipe orifice; 6. a drilling needle; 7. driving a second push rod; 8. the screw driving and speed reducing integrated machine; 9. a screw carrier; 10. a gripper clamp; 11. punching screws; 12. displaying a main screen; 13. a stepping motor; 14. a limit baffle; 15. a screw rod transmission table; 16. a material bearing bin; 17. a support frame; 18. the equipment room; 19. an operating table; 20. a double-rail vibration plate; 21. a movable table top; 22. a screw tray; 23. a servo drive stage; 24. a propulsion cylinder; 25. the screw bears the weight of the hole.
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. 1-5, a drilling and screwing machine for hidden anti-theft net profiles comprises a device bin body 1, a screwing and decelerating integrated machine 8 and a material bearing bin 16, wherein a driving push rod 2 is installed above the device bin body 1, the front end face of the driving push rod 2 is connected with a drilling and decelerating integrated machine 3, a stepping motor 13 is arranged in front of the device bin body 1, a limit baffle 14 is arranged on the right side of the stepping motor 13, a screw transmission table 15 is installed on the right side of the limit baffle 14, the screwing and decelerating integrated machine 8 is installed on the right side of the drilling and decelerating integrated machine 3, a screw bearing body 9 is installed on the lower end face of the screwing and decelerating integrated machine 8, an equipment room 18 is arranged in front of the screw transmission table 15, the material bearing bin 16 is installed on the right side of the equipment room 18, and an operating table 19 is arranged on the right side of the material bearing bin 16.
The lower part of the drilling integrated speed reducer 3 is connected with a drilling bearing plate 4, a drilling pipe orifice 5 is arranged below the drilling bearing plate 4, a drilling needle head 6 is arranged on the lower end surface of the drilling pipe orifice 5, the drilling integrated speed reducer 3 forms a telescopic structure by driving a push rod I2 and an equipment bin body 1, the drilling pipe orifice 5 is horizontally distributed at intervals on the lower end surface of the drilling bearing plate 4, and the drilling needle head 6 and the lower port of the drilling pipe orifice 5 form a detachable structure by sleeving;
the front end face of the screw carrier 9 is provided with a gripper clamp 10, a punching screw 11 is arranged at the front end port of the gripper clamp 10, a driving push rod II 7 is arranged on the right side of the driving push rod I2, a telescopic structure is formed between the driving push rod II 7 and the equipment bin body 1 by the screw driving and speed reducing integrated machine 8, the screw carrier 9 is in a rotating structure between the screw driving and speed reducing integrated machine 8 and the gripper clamp 10, the lower end face of the screw carrier 9 is horizontally distributed at intervals, and the screw driving table 15 is driven by the stepping motor 13, so that the carried aluminum profile stably moves into the equipment without manual movement, the screw driving table is more stable, potential safety hazards are avoided, and the operation number and starting items can be adjusted by the external display main screen 12, so that the screw driving and speed reducing integrated machine is convenient to use;
the invention relates to a novel magnetic chuck, which is characterized in that a supporting frame 17 is arranged below a stepping motor 13, a double-rail vibration disc 20 is arranged behind an operation table 19, a display main screen 12 is arranged on the right side of a driving push rod II 7, the appearance structure of a material bearing bin 16 is disc-shaped, and equipment rooms 18 penetrate through the upper end face of the supporting frame 17;
the movable table top 21 is arranged at the rear of the double-rail vibration table 20, the servo driving table 23 is arranged at the rear of the movable table top 21, the screw tray 22 is arranged above the servo driving table 23, the screw tray 22 is movably connected with the upper end face of the servo driving table 23, the operation table top 19 and the double-rail vibration table 20 are positioned in the same horizontal direction, the screw bearing holes 25 penetrate through the inside of the screw tray 22, the pushing air cylinders 24 are attached to the rear end face of the screw tray 22, the pushing air cylinders 24 form a telescopic structure through the servo driving table 23 and the screw tray 22, and the screw bearing holes 25 are distributed at equal intervals on the upper end face of the screw tray 22.
Working principle: when the device is used, firstly, the device is externally connected with a power supply, then, personnel can manually install the long-strip-shaped aluminum profile at the left end of the screw rod transmission table 15, the long-strip-shaped aluminum profile is driven to move towards the inside of the device by utilizing the driving of the stepping motor 13 and the screw rod transmission principle, firstly, the long-strip-shaped aluminum profile enters the lower part of the drilling bearing plate 4, the drilling bearing plate 4 bearing the drilling integrated speed reducer 3 moves up and down under the driving of the driving push rod I2, meanwhile, the drilling integrated speed reducer 3 drives a plurality of groups of drilling pipe orifices 5 distributed at horizontal intervals below to rotate, and drives drilling needles 6 installed at the bottom to rotate, and finally, the drilling needles 6 can penetrate the surfaces of the aluminum profile into a plurality of groups of holes through the driving of the driving push rod I2, and then the drilling bearing plate 4 returns;
along with the driving of the stepping motor 13, the aluminum profile moves rightwards, because the screws are stored in the material bearing bin 16 in a large quantity, the screws can be plugged into holes in the double-rail vibration disc 20 manually, the screws can be transmitted to the screw tray 22 at the bottom through the double-rail vibration disc 20, when the screw bearing holes 25 above the screw tray 22 and the holes at the output end of the double-rail vibration disc 20 are in the same vertical direction, the screws can smoothly fall into the upper parts of the screw bearing holes 25, and because the screw tray 22 can transversely move left and right by using the driving of the servo driving table 23, the screw bearing holes 25 distributed at intervals above the screw tray 22 can be filled with the screws;
after a group of screw trays 22 are filled, the screw trays 22 are driven by a pushing cylinder 24 to return to the position right below the screw bearing body 9, the distribution distance of screw bearing holes 25 is consistent with that of the screw bearing body 9, the screws at the bottom can be clamped by the gripper clamp 10 to the inner side, then the pushing cylinder 24 is driven to return to extract the screws of the next group, the punched aluminum profile is driven by a stepping motor 13 to move to the position right below the screw bearing body 9, a screw driving and decelerating integrated machine 8 starts to drive a push rod II 7 to move downwards, and meanwhile, the screw driving and decelerating integrated machine 8 starts to rotate a plurality of groups of screw bearing bodies 9 below, so that a plurality of groups of punching screws 11 can be directly rotated to be driven into holes of the aluminum profile.
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 (2)
1. The utility model provides a drilling screw machine for hidden anti-theft net section bar, includes equipment bin body (1), beats screw speed reduction all-in-one (8) and material and bear storehouse (16), its characterized in that: the automatic drilling machine is characterized in that a first driving push rod (2) is arranged above the equipment bin body (1), the front end face of the first driving push rod (2) is connected with a drilling integrated speed reducer (3), a stepping motor (13) is arranged in front of the equipment bin body (1), a limit baffle (14) is arranged on the right side of the stepping motor (13), a screw rod transmission table (15) is arranged on the right side of the limit baffle (14), a screw rod speed reducer (8) is arranged on the right side of the drilling integrated speed reducer (3), a screw carrier (9) is arranged on the lower end face of the screw rod speed reducer (8), an equipment room (18) is arranged in front of the screw rod transmission table (15), a material bearing bin (16) is arranged on the right side of the equipment room (18), and an operation table top (19) is arranged on the right side of the material bearing bin (16);
the drilling integrated speed reducer (3) is characterized in that a drilling bearing plate (4) is connected below the drilling integrated speed reducer (3), a drilling pipe orifice (5) is arranged below the drilling bearing plate (4), a drilling needle head (6) is arranged on the lower end face of the drilling pipe orifice (5), the drilling integrated speed reducer (3) forms a telescopic structure through a driving push rod I (2) and a device bin body (1), the drilling pipe orifice (5) is positioned on the lower end face of the drilling bearing plate (4) at a horizontal interval, and the drilling needle head (6) and the lower port of the drilling pipe orifice (5) form a detachable structure through sleeving;
the front end face of the screw carrier (9) is provided with a gripper clamp (10), a front port of the gripper clamp (10) is provided with a punching screw (11), the right side of the driving push rod I (2) is provided with a driving push rod II (7), the screw driving and speed reducing integrated machine (8) forms a telescopic structure with the equipment bin body (1) through the driving push rod II (7), the screw carrier (9) forms a rotating structure through the screw driving and speed reducing integrated machine (8) and the gripper clamp (10), and the screw carrier (9) is positioned on the lower end face of the screw driving and speed reducing integrated machine (8) in a horizontal interval distribution;
the below of step motor (13) is provided with braced frame (17), and the rear of operation mesa (19) is provided with double track vibration dish (20), display main screen (12) are installed on the right side of drive push rod two (7), movable mesa (21) are installed at the rear of double track vibration dish (20), and the rear of movable mesa (21) is provided with servo drive platform (23), the top of servo drive platform (23) is provided with screw tray (22), the up end swing joint of screw tray (22) and servo drive platform (23), and operation mesa (19) and double track vibration dish (20) are located same horizontal direction, the inside of screw tray (22) is run through there is screw loading hole (25), and the rear end laminating of screw tray (22) has propulsion cylinder (24), constitute telescopic structure between screw loading hole (25) and screw tray (22) are located the equidistant distribution of the up end of screw tray (22) through servo drive platform (23).
2. A drilling and screwing machine for hidden anti-theft net profiles according to claim 1, characterized in that: the appearance structure of the material bearing bin (16) is disc-shaped, and the equipment room (18) penetrates through the upper end face of the supporting frame (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011323937.4A CN112475367B (en) | 2020-11-23 | 2020-11-23 | Drilling and screwing machine for hidden anti-theft net profile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011323937.4A CN112475367B (en) | 2020-11-23 | 2020-11-23 | Drilling and screwing machine for hidden anti-theft net profile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112475367A CN112475367A (en) | 2021-03-12 |
| CN112475367B true CN112475367B (en) | 2024-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011323937.4A Active CN112475367B (en) | 2020-11-23 | 2020-11-23 | Drilling and screwing machine for hidden anti-theft net profile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112475367B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3825144A1 (en) * | 1988-07-23 | 1990-01-25 | Fenstertechnik Gmbh | Apparatus for transporting and working sectional bars |
| CN101664915A (en) * | 2008-09-01 | 2010-03-10 | 倍而速销售株式会社 | Screw coupling strip use in a continous screw tightening machine |
| CN206677526U (en) * | 2016-11-01 | 2017-11-28 | 北京多维联合集团香河建材有限公司 | A kind of gang drill formula floor automatic locking screw machine |
| CN209551075U (en) * | 2019-01-23 | 2019-10-29 | 浙江茗熔电器保护系统有限公司 | A kind of automatic screw nailing equipment with multistage movement velocity |
| CN111644834A (en) * | 2020-06-05 | 2020-09-11 | 浙江亿洲机械科技有限公司 | Detachable truss screw machine |
-
2020
- 2020-11-23 CN CN202011323937.4A patent/CN112475367B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3825144A1 (en) * | 1988-07-23 | 1990-01-25 | Fenstertechnik Gmbh | Apparatus for transporting and working sectional bars |
| CN101664915A (en) * | 2008-09-01 | 2010-03-10 | 倍而速销售株式会社 | Screw coupling strip use in a continous screw tightening machine |
| CN206677526U (en) * | 2016-11-01 | 2017-11-28 | 北京多维联合集团香河建材有限公司 | A kind of gang drill formula floor automatic locking screw machine |
| CN209551075U (en) * | 2019-01-23 | 2019-10-29 | 浙江茗熔电器保护系统有限公司 | A kind of automatic screw nailing equipment with multistage movement velocity |
| CN111644834A (en) * | 2020-06-05 | 2020-09-11 | 浙江亿洲机械科技有限公司 | Detachable truss screw machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112475367A (en) | 2021-03-12 |
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