CN113600572A - Rotation regulation formula sewage pipe inner wall belt cleaning device - Google Patents
Rotation regulation formula sewage pipe inner wall belt cleaning device Download PDFInfo
- Publication number
- CN113600572A CN113600572A CN202110941479.9A CN202110941479A CN113600572A CN 113600572 A CN113600572 A CN 113600572A CN 202110941479 A CN202110941479 A CN 202110941479A CN 113600572 A CN113600572 A CN 113600572A
- Authority
- CN
- China
- Prior art keywords
- connecting rod
- movable
- connecting block
- cleaning head
- sewage pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
- B08B9/049—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes having self-contained propelling means for moving the cleaning devices along the pipes, i.e. self-propelled
- B08B9/051—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes having self-contained propelling means for moving the cleaning devices along the pipes, i.e. self-propelled the cleaning devices having internal motors, e.g. turbines for powering cleaning tools
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
Abstract
The invention belongs to the field of pipeline cleaning, and particularly relates to a rotation-adjusting type sewage pipe inner wall cleaning device which comprises a cleaning head, wherein a driving shaft is fixedly connected to the right end of the cleaning head, a connecting block is arranged at the left end of the cleaning head, a conical head is movably connected to the left side of the connecting block, a plurality of movable grooves are annularly formed in the right side of the connecting block, rotating pins are arranged in the movable grooves, a plurality of brush plates are equidistantly arranged on the annular side of the cleaning head, two brush plate connecting rods are respectively arranged on the lower sides of the brush plates, the left brush plate connecting rod is movably connected with a first connecting rod through the rotating pins, and the other end of the first connecting rod is movably arranged in the movable grooves through the rotating pins. The invention can meet the requirements of cleaning pipelines with different apertures, does not need to replace a cleaning head and is convenient and fast to operate; meanwhile, the outer side of the brush plate can be always attached to the inner wall of the pipeline, so that the cleaning effect is further improved.
Description
Technical Field
The invention belongs to the field of pipeline cleaning, and particularly relates to a rotation adjusting type sewage pipe inner wall cleaning device.
Background
The pipeline transportation has the advantages of large, continuous, rapid, economic, safe, reliable and stable transportation amount, less investment, less occupied area and low cost, and can realize automatic control. Besides being widely used for long-distance transportation of petroleum and natural gas, the material can also be used for transporting ores, coal, building materials, chemicals, grains and the like. The pipeline transportation can save the broken joints in the water transportation or the land transportation, shorten the transportation period, reduce the transportation cost and improve the transportation efficiency. In the case of liquids and gases, all chemically stable substances can be transported by pipelines. Thus, waste water, sludge, water, and even beer can be piped.
When carrying sewage, also often adopt pipeline transport's mode to go on, so both labour saving and time saving can effectively avoid causing the seepage in the transportation process of sewage simultaneously, avoids sewage secondary pollution that causes at the in-process that shifts, and the cost is lower simultaneously, carries very fast. However, due to the characteristics of the medium in the sewage pipe, dirt is often attached to the inner wall of the sewage pipe, and if the sewage pipe is not cleaned, the conveying efficiency is affected, even a serious person can block the sewage pipe, the internal pressure is too high, the pipeline is damaged, and sewage leaks. The inner wall of the sewage pipe is cleaned by adopting mechanical driving cleaning brushes to rotate along the inner wall of the sewage pipe in the prior art, so that the cleaning effect is achieved, different cleaning heads are required to be replaced frequently due to different inner diameters of the sewage pipes, the operation is troublesome, and meanwhile, the inner wall of the sewage pipe is difficult to be always attached, so that the cleaning effect is poor.
Therefore, we propose a rotation adjusting type sewage pipe inner wall cleaning device to solve the above problems.
Disclosure of Invention
The invention aims to solve the problems and provides a rotary adjusting type sewage pipe inner wall cleaning device.
In order to achieve the purpose, the invention adopts the following technical scheme: a rotary adjusting type sewage pipe inner wall cleaning device comprises a cleaning head, wherein the right end of the cleaning head is fixedly connected with a driving shaft, the left end of the cleaning head is provided with a connecting block, the left side of the connecting block is movably connected with a conical head, a plurality of movable grooves are annularly arranged on the right side of the connecting block, rotating pins are arranged in the movable grooves, a plurality of brush plates are equidistantly arranged on the ring side of the cleaning head, two brush plate connecting rods are respectively arranged on the lower sides of the brush plates, the brush plate connecting rod on the left side is movably connected with a first connecting rod through a rotating pin, the other end of the first connecting rod is movably arranged in the movable groove through a rotating pin, the right brush board connecting rod is movably connected with a second connecting rod through a rotating pin, one end of the second connecting rod, which is far away from the brush plate, is movably connected with a second connecting rod connecting block through a pin, and the second connecting rod connecting block is fixedly connected with the middle part of the cleaning head.
In the rotation adjusting type sewage pipe inner wall cleaning device, the cross section of the brush plate is arc-shaped, an inclined part is arranged on one side, away from the conical head, of the brush plate, and a corrugated groove is arranged on one side, away from the cleaning head, of the brush plate.
In foretell rotation regulation formula sewage pipe inner wall belt cleaning device, one side that the middle part of first connecting rod and second connecting rod is close to the cleaning head is equipped with the middle part connecting block, the middle part connecting block has the control lever through rotating pin swing joint, the other end swing joint of control lever has the movable block.
In the rotation regulation type sewage pipe inner wall cleaning device, a plurality of movable grooves are formed in the ring side of the cleaning head, the movable grooves are respectively arranged corresponding to the movable blocks, and the movable blocks are arranged in the movable grooves.
In foretell rotation regulation formula sewage pipe inner wall belt cleaning device, the activity inslot is equipped with the guide bar, the guide bar passes movable block and movable block swing joint, the left side fixedly connected with spring of movable block, the ring side at the guide bar is established to the spring housing.
In foretell rotation regulation formula sewage pipe inner wall belt cleaning device, the right-hand member fixedly connected with drive shaft connecting block of drive shaft, the right side of drive shaft connecting block is equipped with transmission assembly, transmission assembly keeps away from the one end of drive shaft connecting block and is equipped with the end connection piece.
In foretell rotation regulation formula sewage pipe inner wall belt cleaning device, the drive assembly includes a plurality of drive units and linkage unit, the inside of drive unit is equipped with movable chamber, the both ends of linkage unit are the T shape, the tip setting of linkage unit is in movable chamber.
In the rotation adjusting type sewage pipe inner wall cleaning device, the middle part of the right side of the end connecting block is provided with the driving connecting hole.
The invention has the beneficial effects that: according to the invention, a parallelogram is formed by arranging the first connecting rod and the second connecting rod and between the cleaning head and the brush plate, and the distance between the brush plate and the cleaning head can be automatically changed according to the aperture size of the pipeline according to the characteristics of the parallelogram, so that the pipeline cleaning requirements of different apertures are met, particularly, when the reducing pipeline is cleaned, the cleaning head is not required to be replaced, the position of the brush plate can be automatically adjusted, and the cleaning operation is convenient and fast; meanwhile, the outer side of the brush plate can be always attached to the inner wall of the pipeline through the spring, so that the cleaning effect is further improved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment 1 of a rotation adjusting type sewage pipe inner wall cleaning device provided by the invention;
FIG. 2 is a schematic view of the connection between a control rod and a movable block of an embodiment 1 of the rotation adjusting type sewage pipe inner wall cleaning device provided by the invention;
FIG. 3 is a top view of a brush plate of an embodiment 1 of the rotation regulating type inner wall cleaning device for sewage pipes provided by the present invention;
FIG. 4 is a schematic structural diagram of an embodiment 2 of the rotation adjusting type sewage pipe inner wall cleaning device provided by the invention;
FIG. 5 is a schematic structural diagram of a transmission assembly of an embodiment 2 of the rotation adjusting type sewage pipe inner wall cleaning device provided by the invention;
fig. 6 is a schematic structural diagram of an end connecting block of an embodiment 2 of the rotation adjusting type sewage pipe inner wall cleaning device provided by the invention.
In the figure: 1 cleaning head, 2 driving shafts, 3 connecting blocks, 4 conical heads, 5 movable grooves, 6 rotating pins, 7 first connecting rods, 8 second connecting rods, 9 brush plate connecting rods, 10 brush plates, 11 inclined parts, 12 middle connecting blocks, 13 control rods, 14 movable blocks, 15 guide rods, 16 springs, 17 movable grooves, 18 second connecting rod connecting blocks, 19 corrugated grooves, 20 driving shaft connecting blocks, 21 transmission assemblies, 211 transmission units, 212 movable cavities, 213 connecting units, 22 end connecting blocks and 23 driving connecting holes.
Detailed Description
The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Example 1
As shown in figures 1-3, the rotation adjusting type sewage pipe inner wall cleaning device comprises a cleaning head 1, wherein the cleaning head 1 is cylindrical, a driving shaft 2 is fixedly connected at the right end of the cleaning head 1, a driving motor is connected through a driving shaft 2 to drive a cleaning head 1 to rotate, a connecting block 3 is arranged at the left end of the cleaning head 1, the connecting block 3 rotates along with the rotation of the cleaning head 1, a conical head 4 is movably connected at the left side of the connecting block 3, the device can conveniently enter a pipeline for cleaning through the conical head 4, the right side of the connecting block 3 is annularly provided with a plurality of movable grooves 5, the movable grooves 5 are internally provided with rotating pins 6, the annular side of the cleaning head 1 is equidistantly provided with a plurality of brush plates 10, the brush plates 10 rotate along with the rotation of the cleaning head 1, when the cleaning head 1 rotates, the cleaning purpose can be achieved by the friction between the brush plate 10 and the inner wall of the pipeline, and the lower sides of the brush plates 10 are respectively provided with two brush plate connecting rods 9.
The brush plate connecting rod 9 is fixedly arranged at one side of the middle part of the brush plate 10 close to the cleaning head 1, the left brush plate connecting rod 9 is movably connected with a first connecting rod 7 through a rotating pin 6, the first connecting rod 7 can change the angle between the brush plate connecting rod 9 and the rotating pin 6, the other end of the first connecting rod 7 is movably arranged in the movable groove 5 through the rotating pin 6, the end part of the first connecting rod 7 can rotate in the movable groove 5, the right brush plate connecting rod 9 is movably connected with a second connecting rod 8 through the rotating pin 6, the angle between the second connecting rod 8 and the brush plate connecting rod 9 can be changed through the rotating pin 6, one end of the second connecting rod 8 far away from the brush plate 10 is movably connected with a second connecting rod connecting block 18 through the pin 6, the second connecting rod connecting block 18 is fixedly connected at the middle part of the cleaning head 1, and the angle between the second connecting rod 8 and the cleaning head 1 can be changed through the second connecting block 18, since the first link 7 and the second link 8 are arranged in parallel, a parallelogram is formed between the brush plate 10 and the cleaning head 1, and the brush plate 10 is always kept parallel to the cleaning head 1 according to the characteristics of the parallelogram.
The cross-section of brush board 10 is the arc, brush board 10 can select for use silica gel, plastics or metal material according to the pipeline material, so that improve the cleaning performance of pipeline, one side that cone head 4 was kept away from to brush board 10 is equipped with slope 11, it can be convenient for take out the device from the pipeline to set up slope 11, one side that cleaning head 1 was kept away from to brush board 10 is equipped with corrugated groove 19, when brush board 10 was rotatory along with cleaning head 1, can improve and the pipeline between frictional force through corrugated groove 19, thereby improve the cleaning performance.
One side that the middle part of first connecting rod 7 and second connecting rod 8 is close to cleaning head 1 is equipped with middle part connecting block 12, middle part connecting block 12 has control lever 13 through rotating 6 swing joint of pin, the other end swing joint of control lever 13 has movable block 14, can drive control lever 13 through the removal of movable block 14 and rotate with middle part connecting block 12, thereby through the rotation of middle part connecting block 12 control first connecting rod 7 and second connecting rod 8, and then reach the purpose that control changes the distance between brush board 10 and the cleaning head 1.
A plurality of movable grooves 17 are formed in the ring side of the cleaning head 1, the movable grooves 17 are respectively arranged corresponding to the movable blocks 14, the movable blocks 14 are arranged in the movable grooves 17, and the movable blocks 14 can move in the movable grooves 17.
Be equipped with guide bar 15 in the activity groove 17, guide bar 15 passes movable block 14 and 14 swing joint of movable block, movable block 14 can remove along guide bar 15, the left side fixedly connected with spring 16 of movable block 14, the ring side at guide bar 15 is established to spring 16 cover, under spring 16's effect, pulling movable block 14 removes left, thereby drive first connecting rod 7 and second connecting rod 8 and rotate, make first connecting rod 7, the angle increase between second connecting rod 8 and the cleaning head 1, thereby make brush board 10 remain throughout hugging closely with the pipeline inner wall.
The operating principle of the present invention will now be described as follows:
when the device is used, the device can be conveniently inserted into a pipeline through the conical head 4, the cleaning head 1 and the connecting block 3 are driven to rotate through the driving shaft 2, and then the plurality of brush plates 10 are driven to rotate by taking the axis of the cleaning head 1 as the center under the action of the first connecting rod 7 and the second connecting rod 8, so that the inner wall of the pipeline is cleaned; furthermore, when entering pipelines with different apertures, the first connecting rod 7 and the second connecting rod 8 can respectively rotate by taking the rotating pin 6 at the corresponding positions as the center, and the brush plate 10 can be close to or far away from the cleaning head 1, so that the aperture size of the pipeline is automatically adapted, the cleaning head 1 does not need to be replaced, and the operation is convenient and fast; meanwhile, because the first connecting rod 7 and the second connecting rod 8 are arranged in parallel, a parallelogram is formed between the brush plate 10 and the cleaning head 1, according to the characteristics of the parallelogram, the brush plate 10 always keeps parallel with the cleaning head 1, the movable block 14 is pulled to move leftwards under the action of the spring 16, the control rod 13 is driven to rotate while the movable block 14 moves leftwards, the acute angle between the first connecting rod 7 and the cleaning head 1 is increased due to the fact that the end parts of the first connecting rod 7 and the second connecting rod 8 are limited by the rotating pin 6, the angle between the control rod 13 and the first connecting rod 7 and the angle between the second connecting rod 8 are reduced, the first connecting rod 7 and the second connecting rod 8 are driven to rotate, the acute angle between the first connecting rod 7 and the cleaning head 1 is increased, the parallelogram formed between the first connecting rod 7 and the second connecting rod 8 and the brush plate 10 and the cleaning head 1 is deformed, and the brush plate 10 always keeps tightly attached to the inner wall of the pipeline, one side of the brush plate 10, which is far away from the cleaning head 1, is provided with a corrugated groove 19, and when the brush plate 10 rotates along with the cleaning head 1, the friction force between the brush plate and the inner wall of the pipeline can be increased through the corrugated groove 19, so that the cleaning effect is further improved.
Example 2
As shown in fig. 4 to 6, the present embodiment is different from embodiment 1 in that: the right-hand member fixedly connected with drive shaft connecting block 20 of drive shaft 2, it is rotatory to drive shaft 2 to drive through drive shaft connecting block 20, the right side of drive shaft connecting block 20 is equipped with drive assembly 21, it is rotatory to drive shaft connecting block 20 through drive assembly 21, the one end that drive shaft connecting block 20 was kept away from to drive assembly 21 is equipped with end connection block 22, can be used to connect driving motor through end connection block 22, and then it is rotatory to drive assembly 21.
The transmission assembly 21 comprises a plurality of transmission units 211 and a connection unit 213, a movable cavity 212 is arranged inside the transmission unit 211, two ends of the connection unit 213 are T-shaped, the end of the connection unit 213 is arranged in the movable cavity 212, and a certain gap is formed between the connection unit 213 and the movable cavity 212, so that certain deflection can be generated between the transmission unit 211 and the connection unit 213, and further, in the process of cleaning the pipeline, certain rotation can be generated in the pipeline through the transmission assembly 21, the bent pipeline can be cleaned while the rotation is not influenced, and therefore the application range of the device is widened.
The middle part of the right side of the end connecting block 22 is provided with a driving connecting hole 23, and the driving connecting hole 23 is used for connecting a driving shaft of a driving motor.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The utility model provides a rotation regulation formula sewage pipe inner wall belt cleaning device, includes cleaning head (1), its characterized in that, the right-hand member fixedly connected with drive shaft (2) of cleaning head (1), the left end of cleaning head (1) is equipped with connecting block (3), the left side swing joint of connecting block (3) has conical head (4), the right side ring of connecting block (3) is provided with a plurality of movable grooves (5), be equipped with in the movable groove (5) and rotate pin (6), the ring side equidistance of cleaning head (1) is provided with a plurality of brush boards (10), the downside of brush board (10) is provided with two brush board connecting rods (9) respectively, left side brush board connecting rod (9) have first connecting rod (7) through rotating pin (6) swing joint, the other end of first connecting rod (7) passes through rotating pin (6) activity setting in movable groove (5), right side brush board connecting rod (9) have second connecting rod (8) through rotating pin (6) swing joint, the one end that brush board (10) were kept away from in second connecting rod (8) has second connecting rod connecting block (18) through pin (6) swing joint, second connecting rod connecting block (18) fixed connection is at the middle part of cleaning head (1).
2. A rotation regulating type sewer pipe inner wall cleaning device according to claim 1, characterized in that the cross section of said brush plate (10) is arc-shaped, the side of said brush plate (10) away from the conical head (4) is provided with an inclined portion (11), and the side of said brush plate (10) away from the cleaning head (1) is provided with a corrugated groove (19).
3. A rotation adjustable type sewage pipe inner wall cleaning device according to claim 1, wherein a middle connecting block (12) is arranged at one side of the middle part of the first connecting rod (7) and the second connecting rod (8) close to the cleaning head (1), the middle connecting block (12) is movably connected with a control rod (13) through a rotating pin (6), and the other end of the control rod (13) is movably connected with a movable block (14).
4. A rotation adjustable type sewage pipe inner wall cleaning device according to claim 3, wherein a plurality of movable grooves (17) are formed on the ring side of the cleaning head (1), a plurality of movable grooves (17) are respectively arranged corresponding to a plurality of movable blocks (14), and the movable blocks (14) are arranged in the movable grooves (17).
5. The rotation-adjustable sewage pipe inner wall cleaning device according to claim 4, wherein a guide rod (15) is arranged in the movable groove (17), the guide rod (15) penetrates through the movable block (14) to be movably connected with the movable block (14), a spring (16) is fixedly connected to the left side of the movable block (14), and the spring (16) is sleeved on the annular side of the guide rod (15).
6. The rotation-adjustable sewage pipe inner wall cleaning device according to claim 1, wherein a driving shaft connecting block (20) is fixedly connected to the right end of the driving shaft (2), a transmission assembly (21) is arranged on the right side of the driving shaft connecting block (20), and an end connecting block (22) is arranged at one end of the transmission assembly (21) far away from the driving shaft connecting block (20).
7. The rotation-adjustable sewage pipe inner wall cleaning device according to claim 6, wherein the transmission assembly (21) comprises a plurality of transmission units (211) and a connection unit (213), a movable cavity (212) is formed inside the transmission units (211), two ends of the connection unit (213) are T-shaped, and ends of the connection unit (213) are arranged in the movable cavity (212).
8. The rotation-adjustable sewage pipe inner wall cleaning device according to claim 6, wherein the middle part of the right side of the end connecting block (22) is provided with a driving connecting hole (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110941479.9A CN113600572A (en) | 2021-08-17 | 2021-08-17 | Rotation regulation formula sewage pipe inner wall belt cleaning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110941479.9A CN113600572A (en) | 2021-08-17 | 2021-08-17 | Rotation regulation formula sewage pipe inner wall belt cleaning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113600572A true CN113600572A (en) | 2021-11-05 |
Family
ID=78340909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110941479.9A Withdrawn CN113600572A (en) | 2021-08-17 | 2021-08-17 | Rotation regulation formula sewage pipe inner wall belt cleaning device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113600572A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114871219A (en) * | 2022-05-07 | 2022-08-09 | 江苏久祥汽车电器集团有限公司 | Car mould cleaning equipment |
-
2021
- 2021-08-17 CN CN202110941479.9A patent/CN113600572A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114871219A (en) * | 2022-05-07 | 2022-08-09 | 江苏久祥汽车电器集团有限公司 | Car mould cleaning equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109570158B (en) | Convenient positioning type pipeline cleaning robot | |
| CN211649368U (en) | Pipeline butt joint mounting structure | |
| CN107186790A (en) | A kind of fixed-length cut-off equipment for large-diameter pipeline | |
| CN109780239B (en) | Water supply and drainage pipeline connecting device with filtering function | |
| CN113600572A (en) | Rotation regulation formula sewage pipe inner wall belt cleaning device | |
| CN210484557U (en) | Speed reducer easy to clean inside | |
| CN215355150U (en) | Automatic cleaner for inner wall of pipeline | |
| CN113426774B (en) | Reinforcing stainless steel pipe inner wall belt cleaning device | |
| CN115183054B (en) | Natural gas pipeline laying device | |
| CN209006324U (en) | For cleaning the cleaning device of metal bellows inboard wall groove | |
| CN217289647U (en) | Self-rotating pipe cleaner capable of preventing blockage of oil pipeline | |
| CN213745371U (en) | Water supply and drainage pipeline connecting device | |
| CN210676246U (en) | Pipeline cleaning device for oil pipeline | |
| CN211259938U (en) | Device for quickly aligning automatic sealing joint | |
| CN210847679U (en) | Automatic pipeline processing equipment of trombone slide | |
| CN208162207U (en) | Cleaning device and pipeline cleaning robot in pipeline | |
| CN220727176U (en) | Fixed ball valve seat | |
| CN219805822U (en) | End grinding device for pipeline machining | |
| CN214293229U (en) | Environment-friendly dust collector for pipeline cutting | |
| CN221045450U (en) | Assembled stainless steel drilling barrel for slide | |
| CN109372999A (en) | A kind of heavy type shut-off valve | |
| CN219463223U (en) | Prevent deposiing concentrator | |
| CN217801450U (en) | Mechanical seal assembly tool of diving equipment | |
| CN220623063U (en) | Rotary joint with good connection tightness | |
| CN219211806U (en) | Engineering pipeline cutting equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20211105 |