CN214815020U - Perforating device is used in automobile parts processing - Google Patents
Perforating device is used in automobile parts processing Download PDFInfo
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- CN214815020U CN214815020U CN202120860618.0U CN202120860618U CN214815020U CN 214815020 U CN214815020 U CN 214815020U CN 202120860618 U CN202120860618 U CN 202120860618U CN 214815020 U CN214815020 U CN 214815020U
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- 238000012545 processing Methods 0.000 title claims abstract description 23
- 238000005553 drilling Methods 0.000 claims abstract description 87
- 239000002994 raw material Substances 0.000 claims description 13
- 230000008859 change Effects 0.000 abstract description 8
- 230000001012 protector Effects 0.000 abstract description 6
- 230000006378 damage Effects 0.000 abstract description 3
- 238000006073 displacement reaction Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The utility model discloses a perforating device is used in automobile parts processing, including the fixed rotating device of upper end rotating device, drilling radius adjusting device, drilling protector and spare part. The utility model belongs to the technical field of automobile parts perforating device, specifically indicate a perforating device is used in automobile parts processing, through adjusting the position at upper end drill bit place, change the pivoted radius that punches, change the distance between the drilling distance central point, piece splashes when the outside protector of drill bit avoids drilling and brings the secondary damage, the rack and pinion simultaneous working of upper end makes the drill bit rotate along the equipment that needs drill hole, the stop device of bottom is with spare part spacing fixed, take place the displacement when avoiding drilling, it is low effectively to have solved current automobile parts perforating device work efficiency on the existing market, and self structure is complicated, maintain comparatively inconvenient problem.
Description
Technical Field
The utility model belongs to the technical field of automobile parts perforating device, specifically indicate a perforating device is used in automobile parts processing.
Background
The automobile accessory processing is a product which forms all units of the whole automobile accessory processing and serves the automobile accessory processing, and along with the gradual and violent competition of the automobile accessory processing market, the deep mind of the environmental protection idea, the continuous upgrading and the application of the technology, the international automobile accessory processing part industry shows the following development characteristics in recent years: the trend of matching and modular supply of automobile accessory processing systems is emerging; globalization of automobile parts processing and purchasing; the transfer speed of the automobile accessory processing industry is accelerated. At present, automobile parts is in the course of working, often need drill to the spare part surface, and it is tight to press from both sides the part through fixed establishment generally now, drills to the spare part through handheld drilling machine, but fixed establishment's position generally is immovable, when pressing from both sides tight some irregularly shaped spare parts, can not carry out position control, it is relatively poor to lead to fixed effect, and the amount of labour of handheld drilling machine is great, and drilling efficiency is lower, consequently, provides an automobile parts perforating device for automobile machining.
SUMMERY OF THE UTILITY MODEL
To the above situation, for overcoming prior art's defect, the utility model provides a perforating device is used in automobile parts processing, through adjusting the position at upper end drill bit place, change the pivoted radius that punches, change the distance between the drilling distance central point, the piece splashes when drill bit outside protector avoids drilling and brings the secondary damage, the rack and pinion simultaneous working of upper end makes the drill bit rotate along the equipment that needs drilling, the stop device of bottom is with spare part spacing fixed, take place the displacement when avoiding drilling, it is low effectively to have solved current automobile parts perforating device work efficiency on the existing market, and self structure is complicated, maintain comparatively inconvenient problem.
The utility model adopts the following technical scheme: the utility model relates to a perforating device is used in automobile parts processing, including upper end rotating device, drilling radius adjusting device, drilling protector and spare part fixed rotating device, the upper end rotating device is located on the spare part fixed rotating device, drilling radius adjusting device is located on the upper end rotating device, drilling protector is located on the drilling radius adjusting device; the upper end rotating device comprises an upper end rotating power supply motor, an upper end rotating disc, a disc upper end rotating limiting groove, a disc upper end rotating limiting block, a disc bottom end rotating limiting groove, a disc bottom end rotating limiting block, a gear rack clamping groove, a rotating gear and a clamping rack, the upper end rotating power supply motor is arranged on the part fixing rotating device, the upper end rotating disc is connected with the part fixing rotating device, the disc upper end rotating limiting groove is arranged on the upper end rotating disc, the disc upper end rotating limiting block is arranged on the part fixing rotating device, the disc upper end rotating limiting block is clamped and rotatably arranged on the disc upper end rotating limiting groove, the disc bottom end rotating limiting groove is arranged on the upper end rotating disc, the disc bottom end rotating limiting block is arranged on the part fixing rotating device, and the disc bottom end rotating limiting block is clamped on the disc bottom end rotating limiting groove in a sliding manner, the gear rack clamping groove is formed in the upper end of the rotating disc, the rotating gear is arranged on the output end of the upper end of the rotating disc, the rotating gear rotates to be arranged on the gear rack clamping groove, the clamping rack is arranged on the gear rack clamping groove, and the rotating gear is meshed with the clamping rack.
Further, drilling radius adjusting device includes that the lead screw is worked groove, ball, linear bearing, lead screw limiting plate, lead screw and is given motor power and block nut, the upper end is located in the lead screw work groove and is rotated on the disc, the ball block rotates and locates on the lead screw work groove, linear bearing locates on the lead screw work groove, the lead screw limiting plate is located on the lead screw work groove, the lead screw links to each other with ball for motor power's output, block nut block slides and locates on the ball, block nut block slides and locates on the linear bearing.
Further, the drilling protection device comprises a drilling pushing cylinder, a drilling motor connecting plate, a drilling rotating motor, a working drill bit, a drilling protection baffle, a baffle clamping groove and a baffle limiting spring, the drilling pushing cylinder is arranged on the clamping nut, the drilling motor connecting plate is arranged on the output end of the drilling pushing cylinder, the drilling rotating motor is arranged on the drilling motor connecting plate, the working drill bit is arranged on the output end of the drilling rotating motor, the baffle clamping groove is arranged on the drilling motor connecting plate, the drilling protection baffle is arranged on the baffle clamping groove in a clamping and sliding mode, one end of the baffle limiting spring is arranged on the drilling protection baffle, and the other end of the baffle limiting spring is arranged on the drilling motor connecting plate.
Further, the part fixing and rotating device comprises an external fixing support, a bevel gear working groove, a bevel gear power supply motor, a first bevel gear, a second bevel gear, a bevel gear connecting turntable, a raw material limiting splint, a splint clamping block, a splint clamping groove and a splint limiting spring, wherein the external fixing support is connected with the upper end rotating device, the bevel gear working groove is formed in the external fixing support, the bevel gear power supply motor is arranged on the external fixing support, the first bevel gear is rotationally clamped in the bevel gear working groove, the second bevel gear is rotationally clamped in the bevel gear working groove, the first bevel gear is in meshed connection with the second bevel gear, the first bevel gear is arranged at the output end of the bevel gear power supply motor, the bevel gear connecting turntable is arranged on the second bevel gear, and the splint clamping groove is formed in the bevel gear connecting turntable, the clamping device is characterized in that the clamping block of the clamping plate is slidably arranged on the clamping groove of the clamping plate, the raw material limiting clamping plate is arranged on the clamping block of the clamping plate, the clamping limiting spring of the clamping plate is arranged on the clamping groove of the clamping plate, and the clamping block of the clamping plate is connected with the clamping limiting spring of the clamping plate.
Further, the upper end of the disc is provided with a rotary limiting groove in a circular shape, the bottom end of the disc is provided with a rotary limiting groove in a circular shape, and the clamping rack is provided with a circular shape.
Further, the shutter engagement groove is formed in a circular arc shape.
Adopt above-mentioned structure the utility model discloses the beneficial effect who gains as follows: this scheme is perforating device for automobile parts processing, through adjusting the position at upper end drill bit place, change the pivoted radius that punches, change the distance between drilling distance central point, piece splashes and brings the secondary injury when the outside protector of drill bit avoids drilling, rack and pinion simultaneous working of upper end makes the drill bit rotate along the equipment that needs drill hole, the stop device of bottom is with spare part spacing fixed, take place the displacement when avoiding drilling, the current automobile parts perforating device work efficiency of current on the existing market has effectively been solved low, and self structure is complicated, maintain comparatively inconvenient problem.
Drawings
FIG. 1 is a front cross-sectional view of the punching device for machining automobile parts of the present invention;
FIG. 2 is a bottom view of the upper rotating disc of the punching device for machining automobile parts of the present invention;
FIG. 3 is an enlarged view of a portion A of FIG. 1;
FIG. 4 is a partial enlarged view of portion B of FIG. 1;
FIG. 5 is an enlarged view of a portion C of FIG. 1;
fig. 6 is a partially enlarged view of a portion D in fig. 1.
Wherein, 1, an upper end rotating device, 2, a drilling radius adjusting device, 3, a drilling protection device, 4, a part fixing rotating device, 5, an upper end rotating power supply motor, 6, an upper end rotating disc, 7, a disc upper end rotating limiting groove, 8, a disc upper end rotating limiting block, 9, a disc bottom end rotating limiting groove, 10, a disc bottom end rotating limiting block, 11, a gear rack clamping groove, 12, a rotating gear, 13, a clamping rack, 14, a lead screw working groove, 15, a ball lead screw, 16, a linear bearing, 17, a lead screw limiting plate, 18, a lead screw power supply motor, 19, a clamping nut, 20, a drilling pushing cylinder, 21, a drilling motor connecting plate, 22, a drilling rotating motor, 23, a working drill bit, 24, a drilling protection baffle, 25, a baffle clamping groove, 26, a baffle limiting spring, 27, an external fixing bracket, 28, a bevel gear working groove, 29. the bevel gear gives driving motor, 30, first bevel gear, 31, second bevel gear, 32, bevel gear connection carousel, 33, raw material spacing splint, 34, splint block, 35, splint block groove, 36, splint spacing spring.
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments; based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1-6, the punching device for processing automobile parts of the present invention comprises an upper end rotating device 1, a drilling radius adjusting device 2, a drilling protecting device 3 and a part fixing and rotating device 4, wherein the upper end rotating device 1 is arranged on the part fixing and rotating device 4, the drilling radius adjusting device 2 is arranged on the upper end rotating device 1, and the drilling protecting device 3 is arranged on the drilling radius adjusting device 2; the upper end rotating device 1 comprises an upper end rotating power supply motor 5, an upper end rotating disc 6, a disc upper end rotating limiting groove 7, a disc upper end rotating limiting block 8, a disc bottom end rotating limiting groove 9, a disc bottom end rotating limiting block 10, a gear rack clamping groove 11, a rotating gear 12 and a clamping rack 13, wherein the upper end rotating power supply motor 5 is arranged on the part fixing rotating device 4, the upper end rotating disc 6 is connected with the part fixing rotating device 4, the disc upper end rotating limiting groove 7 is arranged on the upper end rotating disc 6, the disc upper end rotating limiting block 8 is arranged on the part fixing rotating device 4, the disc upper end rotating limiting block 8 is arranged on the disc upper end rotating limiting groove 7 in a clamping and rotating mode, the disc bottom end rotating limiting groove 9 is arranged on the upper end rotating disc 6, and the disc bottom end rotating limiting block 10 is arranged on the part fixing rotating device 4, the disc bottom rotation limiting block 10 is arranged on the disc bottom rotation limiting groove 9 in a clamping and sliding mode, the gear and rack clamping groove 11 is formed in the upper end rotation disc 6, the rotating gear 12 is arranged at the output end of the upper end rotation power supply motor 5, the rotating gear 12 is arranged on the gear and rack clamping groove 11 in a clamping and rotating mode, the clamping rack 13 is arranged on the gear and rack clamping groove 11, and the rotating gear 12 is connected with the clamping rack 13 in a meshing mode.
Drilling radius adjusting device 2 includes that the lead screw works groove 14, ball 15, linear bearing 16, lead screw limiting plate 17, lead screw and gives driving motor 18 and block nut 19, the lead screw works groove 14 and locates on the upper end rotating disc 6, ball 15 block is rotated and is located on lead screw works groove 14, linear bearing 16 is located on lead screw works groove 14, lead screw limiting plate 17 is located on lead screw works groove 14, the output that the lead screw gives driving motor 18 links to each other with ball 15, block nut 19 block slides and locates on linear bearing 16.
The drilling protection device 3 comprises a drilling pushing cylinder 20, a drilling motor connecting plate 21, a drilling rotating motor 22, a working drill bit 23, a drilling protection baffle 24, a baffle clamping groove 25 and a baffle limiting spring 26, wherein the drilling pushing cylinder 20 is arranged on a clamping nut 19, the drilling motor connecting plate 21 is arranged at the output end of the drilling pushing cylinder 20, the drilling rotating motor 22 is arranged on the drilling motor connecting plate 21, the working drill bit 23 is arranged at the output end of the drilling rotating motor 22, the baffle clamping groove 25 is arranged on the drilling motor connecting plate 21, the drilling protection baffle 24 is clamped and slidably arranged on the baffle clamping groove 25, one end of the baffle limiting spring 26 is arranged on the drilling protection baffle 24, and the other end of the baffle limiting spring 26 is arranged on the drilling motor connecting plate 21.
The part fixing and rotating device 4 comprises an external fixing bracket 27, a bevel gear working groove 28, a bevel gear power supply motor 29, a first bevel gear 30, a second bevel gear 31, a bevel gear connecting turntable 32, a raw material limiting splint 33, a splint clamping block 34, a splint clamping groove 35 and a splint limiting spring 36, wherein the external fixing bracket 27 is connected with the upper end rotating device 1, the bevel gear working groove 28 is arranged on the external fixing bracket 27, the bevel gear power supply motor 29 is arranged on the external fixing bracket 27, the first bevel gear 30 is clamped and rotated on the bevel gear working groove 28, the second bevel gear 31 is clamped and rotated on the bevel gear working groove 28, the first bevel gear 30 is meshed and connected with the second bevel gear 31, the first bevel gear 30 is arranged on the output end of the bevel gear power supply motor 29, the bevel gear connecting turntable 32 is arranged on the second bevel gear 31, the clamping plate clamping groove 35 is formed in the bevel gear connecting turntable 32, the clamping plate clamping block 34 is arranged on the clamping plate clamping groove 35 in a clamping and sliding mode, the raw material limiting clamping plate 33 is arranged on the clamping plate clamping block 34, the clamping plate limiting spring 36 is arranged on the clamping plate clamping groove 35, and the clamping plate clamping block 34 is connected with the clamping plate limiting spring 36.
The upper end of the disc is provided with a rotary limiting groove 7 in a circular shape, the bottom end of the disc is provided with a rotary limiting groove 9 in a circular shape, and the clamping rack 13 is provided with a circular shape.
The shutter engagement groove 25 is formed in a circular arc shape.
When the device is used specifically, a user places parts needing drilling on an automobile on a bevel gear connecting turntable 32 at the bottom end, the raw material limiting clamp plate 33 is enabled to fix raw materials, the clamp plate limiting spring 36 drives the clamp plate clamping block 34 to limit the raw material limiting clamp plate 33, a screw rod is enabled to work for the power motor 18 as required, the position of the clamping nut 19 on the screw rod working groove 14 is adjusted, after the clamping nut reaches a proper position, the drilling pushing cylinder 20 is enabled to work, the working drill bit 23 rotates to cling to the raw material, after the drilling protective baffle plate 24 is contacted with the raw materials, the drilling protective baffle plate 24 slides along the baffle plate clamping groove 25, the baffle plate limiting spring 26 deforms, in order to drill holes on four corners of the raw materials, the user can control the upper end to rotate for the power motor 5 to work, the rotating gear 12 is meshed and connected with the clamping rack 13, and the upper end rotating disc 6 is enabled to rotate through the clamping rack 13, realize the change of drill bit position, perhaps control bottom bevel gear and give driving motor 29 work, first bevel gear 30 drives second bevel gear 31 and makes bevel gear connect the carousel 32 and rotate, changes the change on the position that raw and other materials upper end needs the drilling position, it is above that the utility model discloses holistic work flow repeats this step when using next time can.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
The present invention and the embodiments thereof have been described above, but the description is not limited thereto, and the embodiment shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should understand that they should not be limited to the embodiments described above, and that they can design the similar structure and embodiments without departing from the spirit of the invention.
Claims (6)
1. The utility model provides a perforating device is used in automobile parts processing which characterized in that: the drilling device comprises an upper end rotating device, a drilling radius adjusting device, a drilling protecting device and a part fixing and rotating device, wherein the upper end rotating device is arranged on the part fixing and rotating device; the upper end rotating device comprises an upper end rotating power supply motor, an upper end rotating disc, a disc upper end rotating limiting groove, a disc upper end rotating limiting block, a disc bottom end rotating limiting groove, a disc bottom end rotating limiting block, a gear rack clamping groove, a rotating gear and a clamping rack, the upper end rotating power supply motor is arranged on the part fixing rotating device, the upper end rotating disc is connected with the part fixing rotating device, the disc upper end rotating limiting groove is arranged on the upper end rotating disc, the disc upper end rotating limiting block is arranged on the part fixing rotating device, the disc upper end rotating limiting block is clamped and rotatably arranged on the disc upper end rotating limiting groove, the disc bottom end rotating limiting groove is arranged on the upper end rotating disc, the disc bottom end rotating limiting block is arranged on the part fixing rotating device, and the disc bottom end rotating limiting block is clamped on the disc bottom end rotating limiting groove in a sliding manner, the gear rack clamping groove is formed in the upper end of the rotating disc, the rotating gear is arranged on the output end of the upper end of the rotating disc, the rotating gear rotates to be arranged on the gear rack clamping groove, the clamping rack is arranged on the gear rack clamping groove, and the rotating gear is meshed with the clamping rack.
2. The perforating device for processing the automobile parts as claimed in claim 1, wherein: drilling radius adjusting device includes that the lead screw is worked groove, ball, linear bearing, lead screw limiting plate, lead screw and is given motor power and block nut, the upper end is located in the lead screw work groove and is rotated on the disc, the ball block is rotated and is located on the lead screw work groove, linear bearing locates on the lead screw work groove, the lead screw limiting plate is located on the lead screw work groove, the lead screw links to each other with ball for motor power's output, block nut block slides and locates on the ball, block nut block slides and locates on the linear bearing.
3. The perforating device for processing the automobile parts as claimed in claim 2, wherein: the drilling protection device comprises a drilling pushing cylinder, a drilling motor connecting plate, a drilling rotating motor, a working drill bit, a drilling protection baffle, a baffle clamping groove and a baffle limiting spring, wherein the drilling pushing cylinder is arranged on a clamping nut, the drilling motor connecting plate is arranged on the output end of the drilling pushing cylinder, the drilling rotating motor is arranged on the drilling motor connecting plate, the working drill bit is arranged on the output end of the drilling rotating motor, the baffle clamping groove is arranged on the drilling motor connecting plate, the drilling protection baffle is arranged on the baffle clamping groove in a sliding mode, one end of the baffle limiting spring is arranged on the drilling protection baffle, and the other end of the baffle limiting spring is arranged on the drilling motor connecting plate.
4. The perforating device for processing the automobile parts as claimed in claim 3, wherein: the part fixing and rotating device comprises an external fixing support, a bevel gear working groove, a bevel gear power supply motor, a first bevel gear, a second bevel gear, a bevel gear connecting turntable, a raw material limiting clamping plate, a clamping plate clamping block, a clamping plate clamping groove and a clamping plate limiting spring, wherein the external fixing support is connected with the upper end rotating device, the bevel gear working groove is formed in the external fixing support, the bevel gear power supply motor is arranged on the external fixing support, the first bevel gear is arranged on the bevel gear working groove in a clamping and rotating mode, the second bevel gear is arranged on the bevel gear working groove in a clamping and rotating mode, the first bevel gear is connected with the second bevel gear in a meshing mode, the first bevel gear is arranged at the output end of the bevel gear power supply motor, the bevel gear connecting turntable is arranged on the second bevel gear, the clamping plate clamping groove is arranged on the bevel gear connecting turntable, the clamping device is characterized in that the clamping block of the clamping plate is slidably arranged on the clamping groove of the clamping plate, the raw material limiting clamping plate is arranged on the clamping block of the clamping plate, the clamping limiting spring of the clamping plate is arranged on the clamping groove of the clamping plate, and the clamping block of the clamping plate is connected with the clamping limiting spring of the clamping plate.
5. The perforating device for processing the automobile parts as claimed in claim 4, wherein: the upper end of the disc is provided with a rotary limiting groove in an annular shape, the bottom end of the disc is provided with a rotary limiting groove in an annular shape, and the clamping rack is provided with an annular shape.
6. The perforating device for processing the automobile parts as claimed in claim 5, wherein: the baffle clamping groove is in a circular arc shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120860618.0U CN214815020U (en) | 2021-04-25 | 2021-04-25 | Perforating device is used in automobile parts processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120860618.0U CN214815020U (en) | 2021-04-25 | 2021-04-25 | Perforating device is used in automobile parts processing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214815020U true CN214815020U (en) | 2021-11-23 |
Family
ID=78768925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120860618.0U Expired - Fee Related CN214815020U (en) | 2021-04-25 | 2021-04-25 | Perforating device is used in automobile parts processing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214815020U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114700519A (en) * | 2022-03-24 | 2022-07-05 | 浙江圣峰汽车部件有限公司 | Perforating device is used in processing of fuel filter |
-
2021
- 2021-04-25 CN CN202120860618.0U patent/CN214815020U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114700519A (en) * | 2022-03-24 | 2022-07-05 | 浙江圣峰汽车部件有限公司 | Perforating device is used in processing of fuel filter |
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| 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: 20211123 |