CN215144855U - Door and window drilling device with automatic positioning function - Google Patents
Door and window drilling device with automatic positioning function Download PDFInfo
- Publication number
- CN215144855U CN215144855U CN202120740808.9U CN202120740808U CN215144855U CN 215144855 U CN215144855 U CN 215144855U CN 202120740808 U CN202120740808 U CN 202120740808U CN 215144855 U CN215144855 U CN 215144855U
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- door
- workbench
- window
- drilling
- transverse moving
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- 238000005553 drilling Methods 0.000 title claims abstract description 68
- 230000007246 mechanism Effects 0.000 claims abstract description 130
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 16
- 238000009434 installation Methods 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000000741 silica gel Substances 0.000 claims description 8
- 229910002027 silica gel Inorganic materials 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 11
- 238000000034 method Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
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Abstract
The utility model discloses a door and window drilling device with automatic positioning function, which comprises a workbench and a controller, wherein the workbench is respectively provided with a first transverse moving mechanism, a second transverse moving mechanism and a first driving mechanism and a second driving mechanism for driving, the first transverse moving mechanism is provided with a first electric telescopic clamping mechanism, and the second transverse moving mechanism is provided with a bidirectional drilling mechanism; the controller is respectively electrically connected with the positioning element, the first electric telescopic clamping mechanism, the first driving mechanism, the second driving mechanism and the bidirectional drilling mechanism. The utility model can clamp the part to be drilled on the door and window frame, thereby improving the stability and the processing precision during drilling; the positions to be drilled on the two sides of the door and window frame can be drilled simultaneously, so that the working efficiency is improved; in addition, automatic positioning during drilling operation can be realized, and the installation of doors and windows is facilitated.
Description
Technical Field
The utility model relates to an aluminum alloy door and window production and processing equipment technical field specifically is a door and window drilling equipment with automatic positioning function.
Background
The aluminium alloy door and window is a door and window made up by using aluminium alloy section bar whose surface is treated, making frame-shaped member through the processes of blanking, punching, milling groove, tapping and making, and adopting connecting piece, sealing material and hardware fittings through the processes of combining and assembling. Has the characteristics of light weight, good structural strength, convenient manufacture and the like.
Aluminum alloy door and window is a widely used structure, decorative material in the architectural decoration field at present, mainly including aluminum alloy frame (door and window frame) and two glass doors and windows, wherein aluminum alloy frame adopts expansion bolts or reinforcing bar etc. to fix in the door opening or the window of wall body, this just needs to adopt drilling equipment to process a plurality of holes at the four sides of aluminum alloy frame before the installation, can fix the indisputable foot of aluminum alloy frame to the wall body after penetrating expansion bolts or reinforcing bar to fix aluminum alloy frame in the door opening or the window of wall body.
At present, the most common drilling method is to adopt a manual drilling mode, namely, a worker holds tools such as an electric drill and the like, and holes are sequentially processed along four sides of an aluminum alloy frame.
In addition, some special drilling devices can be adopted, so that the working efficiency can be effectively improved, but due to the fact that positioning measures are not adopted, drilled holes and corresponding iron feet are prone to deviation and cannot be fixed, and accordingly scrapping is caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects and shortcomings of the prior art, and provides a door and window drilling device with an automatic positioning function, which can clamp the part to be drilled of the door and window frame so as to improve the stability and the processing precision during drilling; the positions to be drilled on the two sides of the door and window frame can be drilled simultaneously, so that the working efficiency is improved; in addition, automatic positioning during drilling operation can be realized, and the installation of doors and windows is facilitated.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides a door and window drilling equipment with automatic positioning function, including workstation and controller, its characterized in that: the two sides of the workbench are respectively provided with a first transverse moving mechanism arranged along the length direction of the workbench, the first transverse moving mechanisms are driven by a first driving mechanism, the first transverse moving mechanisms are provided with first electric telescopic clamping mechanisms, and the first electric telescopic clamping mechanisms at the two sides respectively clamp the parts to be drilled of the door and window frames from the two sides; the middle part of the workbench is provided with a groove arranged along the length direction of the workbench, a second transverse moving mechanism arranged along the length direction of the workbench is arranged in the groove, the second transverse moving mechanism is driven by a second driving mechanism, a bidirectional drilling mechanism is arranged on the second transverse moving mechanism, and the bidirectional drilling mechanism can simultaneously drill holes on parts to be drilled on two sides of the door and window frame; the controller is electrically connected with the positioning element on one hand and the first electric telescopic clamping mechanism, the first driving mechanism, the second driving mechanism and the bidirectional drilling mechanism on the other hand respectively.
Furthermore, first sideslip mechanism including fix two first mount pads on the workstation, two first mount pads between rotate and install along the length direction of workstation sets up first lead screw, first lead screw on install first removal seat through screw-thread fit.
Furthermore, the second transverse moving mechanism comprises two second installation seats fixed in the groove, a second lead screw arranged along the length direction of the workbench is rotatably installed between the two second installation seats, and a second moving seat is installed on the second lead screw in a threaded fit mode.
Furthermore, the first driving mechanism and the second driving mechanism both adopt motors capable of rotating forward and backward, the controller is electrically connected with the motors, and the motors are in transmission connection with the first screw rod or the second screw rod.
Furthermore, the first electric telescopic clamping mechanism comprises two first electric cylinders fixed on the first movable seat, the controller is electrically connected with the two first electric cylinders, the telescopic ends of the two first electric cylinders are fixedly connected with a first top plate, and the front side surface of the first top plate is fixedly connected with a first rubber pad or a silica gel pad.
Furthermore, the two-way drilling mechanism including fix the biax motor on the second removes the seat, the controller with the biax motor electricity is connected, the drill bit is all installed to two output shafts of biax motor.
Furthermore, the positioning element comprises two groups of infrared geminate transistors electrically connected with the controller, infrared transmitting tubes in the two groups of geminate transistors are respectively and correspondingly arranged on the first movable seat at two sides, and infrared receiving tubes in the two groups of geminate transistors are respectively and correspondingly arranged at two sides of the second movable seat.
Furthermore, the workbench is respectively provided with a plurality of second electric telescopic clamping mechanisms, and the plurality of second electric telescopic clamping mechanisms respectively clamp the non-drilling parts of the door and window frame.
Furthermore, each second electric telescopic clamping mechanism comprises a second electric cylinder fixed on the workbench, the controller is electrically connected with the second electric cylinder, a telescopic end of the second electric cylinder is fixedly connected with a second top plate, and a front side face of the second top plate is fixedly connected with a second rubber pad or a silica gel pad.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses set up the first sideslip mechanism by a actuating mechanism driven respectively in the both sides of workstation to install first electronic flexible clamping mechanism on first sideslip mechanism, can follow the length direction removal of workstation, can treat the drilling position from both sides respectively and press from both sides tightly, the stability at this position when having improved drilling has avoided rocking when drilling because of the aluminum alloy is comparatively slim and graceful and has caused the drilling deviation, has improved the machining precision.
2. The utility model discloses set up the second sideslip mechanism by second actuating mechanism driven at the middle part of workstation to install two-way drilling mechanism on second sideslip mechanism, can follow the length direction removal of workstation, can drill to the position of waiting to drill of door and window frame both sides simultaneously, improved work efficiency greatly.
3. The utility model discloses the setting can carry out the positioning element who fixes a position to two-way drilling mechanism to by the work of the first electronic flexible clamping mechanism of controller control, first actuating mechanism, second actuating mechanism and two-way drilling mechanism, automatic operation has been realized, the drill bit of having guaranteed two-way drilling mechanism can aim at the position of waiting to drill of door and window frame both sides, automatic positioning when having realized drilling operation, make the hole that drills out keep just right with corresponding indisputable foot, be favorable to door and window's installation.
4. The utility model discloses set up the electronic flexible clamping mechanism of a plurality of second respectively on the workstation, can press from both sides tightly the non-drilling position of door and window frame, use during the cooperation drilling operation, door and window frame's overall stability when having improved drilling has further improved the machining precision.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an enlarged schematic view of a portion a in fig. 1.
Fig. 3 is an enlarged schematic view of the structure of part B in fig. 1.
Fig. 4 is an enlarged schematic view of a portion C in fig. 1.
Fig. 5 is a schematic block diagram of the electrical control of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying 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.
Referring to fig. 1-5, a door and window drilling device with an automatic positioning function comprises a workbench 1 and a controller 2 (PLC), wherein first transverse moving mechanisms 3 arranged along the length direction of the workbench 1 are respectively installed on two sides of the workbench 1, the first transverse moving mechanisms 3 are driven by first driving mechanisms 4, first electric telescopic clamping mechanisms 5 are installed on the first transverse moving mechanisms 3, and the first electric telescopic clamping mechanisms 5 on the two sides respectively clamp the parts to be drilled of a door and window frame 12 from the two sides; a groove 6 arranged along the length direction of the workbench 1 is formed in the middle of the workbench 1, a second transverse moving mechanism 7 arranged along the length direction of the workbench 1 is installed in the groove 6, the second transverse moving mechanism 7 is driven by a second driving mechanism 8, a bidirectional drilling mechanism 9 is installed on the second transverse moving mechanism 7, and the bidirectional drilling mechanism 9 can simultaneously drill the parts to be drilled on the two sides of the door and window frame 12; the drilling machine further comprises a positioning element 10 capable of positioning the bidirectional drilling mechanism 9, and the controller 2 is electrically connected with the positioning element 10 on one hand and is electrically connected with the first electric telescopic clamping mechanism 5, the first driving mechanism 4, the second driving mechanism 8 and the bidirectional drilling mechanism 9 on the other hand.
The utility model discloses in, first sideslip mechanism 3 rotates between two first mount pads 31 including fixing two first mount pads 31 on workstation 1, two first mount pads 31 and installs the first lead screw 32 that sets up along the length direction of workstation 1, installs first removal seat 33 through screw-thread fit on the first lead screw 32.
The utility model discloses in, second sideslip mechanism 7 rotates between two second mount pads 71 including fixing two second mount pads 71 in recess 6 between two second mount pads 71 and installs the second lead screw 72 that sets up along the length direction of workstation 1, installs the second through screw-thread fit on the second lead screw 72 and removes seat 73.
The utility model discloses in, first actuating mechanism 4 and second actuating mechanism 8 all adopt the motor that can carry out just reversal, and controller 2 is connected with the motor electricity, and motor and first lead screw 32 or second lead screw 72 looks transmission connection.
Therefore, the motor rotates forwards and backwards to drive the first screw rod 32 or the second screw rod 72 to rotate forwards and backwards, so that the first movable seat 33 or the second movable seat 73 moves back and forth along the length direction of the workbench 1, and then the first electric telescopic clamping mechanism 5 or the two-way drilling mechanism 9 is driven to move back and forth along the length direction of the workbench 1, and therefore different parts to be drilled of the door and window frame 12 are clamped or drilled.
The utility model discloses in, first electronic flexible clamping mechanism 5 is connected with two first electric jars 51 electricity including fixing two first electric jars 51 on first removal seat 33, controller 2, and the first roof 52 of the equal fixedly connected with of flexible end of two first electric jars 51, the first rubber pad of leading flank fixedly connected with or silica gel pad 53 of first roof 52.
Therefore, the two first electric cylinders 51 stretch to drive the first top plate 52 and the first rubber pad or the silica gel pad 53 to stretch, so that the part to be drilled of the door and window frame 12 is clamped or unlocked.
The utility model discloses in, two-way drilling mechanism 9 is connected with double-shaft motor 91 electricity including fixing the double-shaft motor 91 on second removal seat 73, controller 2, and drill bit 92 is all installed to two output shafts of double-shaft motor 91.
Therefore, the positions to be drilled on the two sides of the door and window frame 12 can be drilled simultaneously.
The utility model discloses in, locating element 10 is including two sets of infrared geminate transistors of being connected with controller 2 looks electricity, and the infrared transmitting tube 101 in two sets of geminate transistors corresponds respectively and installs on the first removal seat 33 of both sides, and the infrared receiving tube 102 in two sets of geminate transistors corresponds respectively and installs the both sides of removing seat 73 at the second.
From this, through matched with infrared transmitting tube 101 and infrared receiving tube 102 to control first actuating mechanism 4 and the work of second actuating mechanism 8 (motor) through controller 2, realize the automation mechanized operation, guarantee that two-way drilling mechanism 9's drill bit 92 can aim at the position of waiting to drill of door and window frame 12 both sides, automatic positioning when realizing the drilling operation, make the hole of drilling just right with corresponding indisputable foot, be favorable to the installation of door and window.
The utility model discloses in, install the electronic flexible clamping mechanism 11 of a plurality of second on the workstation 1 respectively, the electronic flexible clamping mechanism 11 of a plurality of second presss from both sides tightly the non-drilling position of door and window frame 12 respectively.
Correspondingly, each second electric telescopic clamping mechanism comprises a second electric cylinder 111 fixed on the workbench, the controller 2 is electrically connected with the second electric cylinder 111, the telescopic end of the second electric cylinder 111 is fixedly connected with a second top plate 112, and the front side surface of the second top plate 112 is fixedly connected with a second rubber pad or a silica gel pad 113.
Therefore, the second top plate 112 and the second rubber pad or the silica gel pad 113 are driven to stretch and retract by stretching and retracting the second electric cylinder 111, so that the non-drilling part of the door and window frame 12 is clamped or unlocked.
The invention is further described below with reference to the accompanying drawings:
before working, the door and window frame 12 is placed on the working table 1, the position of the door and window frame 12 is adjusted, so that the parts (edges) to be drilled on the two sides of the door and window frame 12 respectively face the first electric telescopic clamping mechanisms 5 on the two sides, and the central line of the door and window frame 12 and the central line of the groove 6 are kept on the same straight line as far as possible.
During operation, the controller 2 controls the first driving mechanism 4 and the second driving mechanism 8 (motor) to operate respectively.
The first driving mechanism 4 drives the first screw rod 32 to rotate forward and backward, so that the first moving seat 33 moves back and forth along the length direction of the workbench 1, and further drives the first electric telescopic clamping mechanism 5 to move back and forth along the length direction of the workbench 1, and thus different parts to be drilled of the door and window frame 12 are clamped; the second driving mechanism 8 drives the second screw rod 72 to rotate forward and backward, so that the second moving seat 73 moves back and forth along the length direction of the workbench 1, and then the two-way drilling mechanism 9 is driven to move back and forth along the length direction of the workbench 1, and drilling on different parts to be drilled of the door and window frame 12 is achieved.
In the working process, after a hole is processed in the previous part to be drilled, the controller 2 sends a control instruction to the first electric telescopic clamping mechanism 5, and the first electric telescopic clamping mechanism 5 retracts to release the clamping of the part; then, the controller 2 sends a control instruction to the first driving mechanism 4, and the first driving mechanism 4 drives the first screw rod 32 to rotate, so that the first moving seat 33 moves along the length direction of the workbench 1, and further drives the first electric telescopic clamping mechanism 5 to move along the length direction of the workbench 1 to a next part to be drilled and then stop; then, the controller 2 sends a control command to the first electric telescopic clamping mechanism 5 again, and the first electric telescopic clamping mechanism 5 stretches out to clamp the next part to be drilled. At this time, the infrared transmitting tube 101 reaches the next hole to be drilled along with the first movable base 33.
Then, the controller 2 sends a control command to the second driving mechanism 8, and the second driving mechanism 8 drives the second screw 72 to rotate, so that the second moving seat 73 moves along the length direction of the workbench 1, and further drives the bidirectional drilling mechanism 9 to move along the length direction of the workbench 1. In this process, the infrared receiving tube 102 moves with the second movable base 73.
When the infrared receiving tube 102 is opposite to the infrared transmitting tube 101, a pulse signal is immediately generated and sent to the controller 2, the controller 2 judges that the second moving seat 73 and the bidirectional drilling mechanism 9 reach the next part to be drilled, and immediately sends a control instruction to the second driving mechanism 8, and the second driving mechanism 8 stops working; subsequently, the controller 2 sends a control command to the bidirectional drilling mechanism 9 to operate the mechanism, thereby performing drilling operation on the portion to be drilled.
During the whole drilling operation, the second electric cylinder 111 is controlled by the controller 2 to extend, and the non-drilling part of the door frame 12 is clamped all the time.
Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.
Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (9)
1. The utility model provides a door and window drilling equipment with automatic positioning function, including workstation and controller, its characterized in that: the two sides of the workbench are respectively provided with a first transverse moving mechanism arranged along the length direction of the workbench, the first transverse moving mechanisms are driven by a first driving mechanism, the first transverse moving mechanisms are provided with first electric telescopic clamping mechanisms, and the first electric telescopic clamping mechanisms at the two sides respectively clamp the parts to be drilled of the door and window frames from the two sides; the middle part of the workbench is provided with a groove arranged along the length direction of the workbench, a second transverse moving mechanism arranged along the length direction of the workbench is arranged in the groove, the second transverse moving mechanism is driven by a second driving mechanism, a bidirectional drilling mechanism is arranged on the second transverse moving mechanism, and the bidirectional drilling mechanism can simultaneously drill holes on parts to be drilled on two sides of the door and window frame; the controller is electrically connected with the positioning element on one hand and the first electric telescopic clamping mechanism, the first driving mechanism, the second driving mechanism and the bidirectional drilling mechanism on the other hand respectively.
2. The door and window drilling device with the automatic positioning function as claimed in claim 1, wherein: the first transverse moving mechanism comprises two first installation seats fixed on the workbench, a first lead screw arranged along the length direction of the workbench is rotatably installed between the two first installation seats, and a first moving seat is installed on the first lead screw in a threaded fit mode.
3. The door and window drilling device with the automatic positioning function as claimed in claim 2, wherein: the second transverse moving mechanism comprises two second mounting seats fixed in the groove, a second lead screw arranged along the length direction of the workbench is rotatably mounted between the two second mounting seats, and a second moving seat is mounted on the second lead screw in a threaded fit mode.
4. A door and window drilling device with automatic positioning function as claimed in claim 3, characterized in that: the first driving mechanism and the second driving mechanism both adopt motors capable of rotating forward and backward, the controller is electrically connected with the motors, and the motors are in transmission connection with the first screw rods or the second screw rods.
5. The door and window drilling device with the automatic positioning function as claimed in claim 2, wherein: the first electric telescopic clamping mechanism comprises two first electric cylinders fixed on the first movable seat, the controller is electrically connected with the two first electric cylinders, the telescopic ends of the two first electric cylinders are fixedly connected with a first top plate, and the front side surface of the first top plate is fixedly connected with a first rubber pad or a silica gel pad.
6. A door and window drilling device with automatic positioning function as claimed in claim 3, characterized in that: the bidirectional drilling mechanism comprises a double-shaft motor fixed on the second movable seat, the controller is electrically connected with the double-shaft motor, and drill bits are mounted on two output shafts of the double-shaft motor.
7. A door and window drilling device with automatic positioning function as claimed in claim 3, characterized in that: the positioning element comprises two groups of infrared geminate transistors electrically connected with the controller, infrared transmitting tubes in the two groups of geminate transistors are respectively and correspondingly arranged on the first movable seat at two sides, and infrared receiving tubes in the two groups of geminate transistors are respectively and correspondingly arranged at two sides of the second movable seat.
8. The door and window drilling device with the automatic positioning function as claimed in claim 1, wherein: the workbench is respectively provided with a plurality of second electric telescopic clamping mechanisms, and the plurality of second electric telescopic clamping mechanisms respectively clamp the non-drilling parts of the door and window frame.
9. The door and window drilling device with automatic positioning function as claimed in claim 8, wherein: each second electric telescopic clamping mechanism comprises a second electric cylinder fixed on the workbench, the controller is electrically connected with the second electric cylinder, a telescopic end of the second electric cylinder is fixedly connected with a second top plate, and a front side face of the second top plate is fixedly connected with a second rubber pad or a silica gel pad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120740808.9U CN215144855U (en) | 2021-04-13 | 2021-04-13 | Door and window drilling device with automatic positioning function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120740808.9U CN215144855U (en) | 2021-04-13 | 2021-04-13 | Door and window drilling device with automatic positioning function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215144855U true CN215144855U (en) | 2021-12-14 |
Family
ID=79356472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120740808.9U Expired - Fee Related CN215144855U (en) | 2021-04-13 | 2021-04-13 | Door and window drilling device with automatic positioning function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215144855U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114346685A (en) * | 2022-01-10 | 2022-04-15 | 杭州富锚机械有限公司 | Drilling and chamfering integrated machine tool and machining method thereof |
| CN117921055A (en) * | 2024-03-25 | 2024-04-26 | 山东鲁达轿车配件股份有限公司 | Perforating device is used in processing of high-speed brake disc |
-
2021
- 2021-04-13 CN CN202120740808.9U patent/CN215144855U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114346685A (en) * | 2022-01-10 | 2022-04-15 | 杭州富锚机械有限公司 | Drilling and chamfering integrated machine tool and machining method thereof |
| CN117921055A (en) * | 2024-03-25 | 2024-04-26 | 山东鲁达轿车配件股份有限公司 | Perforating device is used in processing of high-speed brake disc |
| CN117921055B (en) * | 2024-03-25 | 2024-05-31 | 山东鲁达轿车配件股份有限公司 | Perforating device is used in processing of high-speed brake disc |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211214 |