CN110743214A - Self-purification type filtering device - Google Patents
Self-purification type filtering device Download PDFInfo
- Publication number
- CN110743214A CN110743214A CN201911003977.8A CN201911003977A CN110743214A CN 110743214 A CN110743214 A CN 110743214A CN 201911003977 A CN201911003977 A CN 201911003977A CN 110743214 A CN110743214 A CN 110743214A
- Authority
- CN
- China
- Prior art keywords
- filter material
- liquid discharge
- cylinder body
- cavity
- sealing plate
- 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.)
- Granted
Links
- 238000001914 filtration Methods 0.000 title claims description 19
- 238000000746 purification Methods 0.000 title description 2
- 239000007788 liquid Substances 0.000 claims abstract description 100
- 239000000463 material Substances 0.000 claims abstract description 68
- 238000007789 sealing Methods 0.000 claims abstract description 35
- 239000002699 waste material Substances 0.000 claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 22
- 238000004140 cleaning Methods 0.000 claims abstract description 16
- 238000007599 discharging Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 239000008213 purified water Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011012 sanitization Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
- B01D24/10—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being held in a closed container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/46—Regenerating the filtering material in the filter
- B01D24/4631—Counter-current flushing, e.g. by air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/48—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof integrally combined with devices for controlling the filtration
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
Abstract
The invention provides a self-cleaning filter device, at least comprising: a housing; the shell comprises a cylinder body, and two ends of the cylinder body are provided with connecting flanges; a waste liquid outlet is formed in the side wall of the cylinder body; a filter element; the filter element is arranged in the cylinder body and divides the cylinder body into an upper chamber and a lower chamber; the filter element comprises: a fixed shaft; the supporting disc is fixedly connected with the cylinder body through supporting discs at two ends, and the supporting discs are in a spoke type structure; a filter material mechanism and a waste liquid discharge mechanism; the waste liquid discharge mechanism comprises: the liquid discharge tank is arranged on one side of the filter material cylinder, a liquid inlet of the liquid discharge tank is attached to the first sealing plate, and a liquid outlet of the liquid discharge tank penetrates out of the waste liquid outlet and is used for discharging waste liquid; a left shutter and a right shutter; the liquid discharge grooves are respectively arranged at two sides of the liquid discharge groove and are connected with the liquid discharge groove; when the liquid inlet of the liquid discharge groove is coincided with the liquid inlet of a certain filter material placing cavity or partially coincided with the liquid inlet of the certain filter material placing cavity, the left shading plate and the right shading plate are used for shading the liquid inlet of the adjacent filter material placing cavity of the filter material placing cavity.
Description
Technical Field
The invention relates to a filtering device, in particular to a self-cleaning filtering device.
Background
In the traditional water filtering device, filter materials such as quartz sand, activated carbon and the like need to be cleaned or replaced regularly so as to avoid affecting the filtering effect.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a self-cleaning filtering device to solve the above-mentioned problems of the prior art.
To achieve the above and other related objects, an object of the present invention is to provide a self-cleaning filter device, comprising at least:
a housing; the shell comprises a cylinder body, and two ends of the cylinder body are provided with connecting flanges; a waste liquid outlet is formed in the side wall of the cylinder body;
a filter element; the filter element is arranged in the cylinder body and divides the cylinder body into an upper chamber and a lower chamber; the filter element comprises:
a fixed shaft; the supporting disc is fixedly connected with the cylinder body through supporting discs at two ends, and the supporting discs are in a spoke type structure;
a material filtering mechanism; the filter material mechanism comprises a shaft sleeve, and the shaft sleeve is sleeved on the fixed shaft and can rotate around the fixed shaft; the outer wall of the shaft sleeve is uniformly provided with a plurality of spiral fin plates; a filter material cylinder is sleeved outside the spiral fin plate; a first sealing plate and a second sealing plate are respectively arranged at two ends of the filter material cylinder, wherein at least one sealing plate is detachable, and a plurality of water through holes are uniformly formed in the first sealing plate and the second sealing plate; the space between the filter material cylinder, the first sealing plate, the second sealing plate and each two adjacent spiral fin plates forms a plurality of filter material placing cavities with the same shape, and each filter material placing cavity is used for placing a filter material;
a waste liquid discharge mechanism; the waste liquid discharge mechanism includes:
the liquid discharge tank is arranged on one side of the filter material cylinder and is fixedly connected with the cylinder; a liquid inlet of the sealing plate is attached to the first sealing plate, and a liquid outlet of the sealing plate penetrates out of the waste liquid outlet and is used for discharging waste liquid;
a left shutter and a right shutter; the liquid discharge grooves are respectively arranged at two sides of the liquid discharge groove and are connected with the liquid discharge groove; when the liquid inlet of the liquid discharge groove is coincided with the liquid inlet of a certain filter material placing cavity or partially coincided, the left shading plate and the right shading plate are used for shading the liquid inlet of the adjacent filter material placing cavity of the filter material placing cavity.
Preferably, the waste liquid discharge mechanism further comprises a liquid discharge control device, and the liquid discharge control device comprises a control oil cylinder; the piston ring of the control oil cylinder divides the inner cavity of the cylinder body of the control oil cylinder into a first cavity and a second cavity; the first cavity is communicated with the upper cavity of the barrel through a pipeline, and the second cavity is communicated with the lower cavity of the barrel through a pipeline; arranging an elastic element in the first chamber, wherein one end of the elastic element is abutted against a piston ring; the other end of the elastic element is propped against the upper end of the cylinder body;
and a piston rod of the control oil cylinder is connected with a flashboard, and the flashboard opens or closes a liquid outlet of the liquid discharge tank when the piston rod reciprocates.
Further preferably, the elastic element is a spring.
Preferably, a bearing is installed between the shaft sleeve and the fixed shaft.
Preferably, the shape of the liquid inlet of the liquid discharge groove is the same as the shape of the radial section of the filter material placing cavity.
Preferably, the shape of the left shielding plate and the right shielding plate is the same as the shape of the radial section of the filter material placing cavity.
When the self-cleaning filter device is used, the self-cleaning filter device is connected into a water passing pipeline through the connecting flanges at two ends, and when liquid passes through the water passing hole of the first sealing plate from the lower cavity, enters the filter material placing cavity, is filtered by the filter material and then enters the upper cavity; the spiral fin plate is spirally twisted, so that the filter material mechanism rotates under the action of water flow; when a certain filter material placing cavity coincides or partially coincides with the liquid inlet of the liquid discharge tank, because the pressure (water inlet pressure) of the lower cavity is greater than the pressure (water outlet pressure) of the upper cavity and is greater than the external pressure, part of filtered purified water passes through the liquid discharge tank from the upper cavity after passing through the filter material placing cavity, washes the filter material clean and then is discharged. Because the water passing area of the liquid discharge groove is far smaller than the sectional area of the cylinder body, most of the purified water can still be ensured to flow out of the water passing pipeline.
The liquid discharge control device has the functions of: when the impurities attached to the filter element are more and more, the pressure difference between the water inlet pressure of the lower chamber and the water outlet pressure of the upper chamber is increased, the piston rod overcomes the pressure of the elastic element to move upwards, and the flashboard is opened; along with the filter material is by the sanitization gradually, the pressure differential of the pressure of intaking of lower cavity and the play water pressure of last cavity reduces gradually, and when pressure differential was less than the effort of elastic element to the piston ring, the flashboard downstream, and the liquid outlet of flowing back groove is closed. The filter material is circularly cleaned.
The self-cleaning filtering device solves the problem that the filtering material needs to be cleaned or replaced regularly in the prior art, improves the working efficiency and saves the production cost.
Drawings
FIG. 1 is an isometric view of a schematic construction of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a sectional view taken along line A-A;
fig. 4 and 5 are front and side views of the support plate, respectively;
FIGS. 6 and 7 are front and side views of the first and second closure plates, respectively;
FIG. 8 is an isometric view of a portion of the filter media mechanism;
FIG. 9 is an isometric view of a waste removal mechanism;
in the figure: 1 cylinder, 2 connecting flanges, 3 connecting flanges, 4 upper cavity, 5 lower cavity, 6 fixing shafts, 7 supporting discs, 8 shaft sleeves, 9 first sealing plates, 10 spiral fin plates, 11 filter material cylinders, 12 supporting discs, 13 second sealing plates, 14 liquid discharge grooves, 15 pipelines, 16 second cavity, 17 control oil cylinders, 18 first cavity, 19 pipelines, 20 springs, 21 water passing holes, 22 liquid inlet, 23 left shielding plates, 24 right shielding plates, 25 liquid outlet, 26 piston rings and 27 flashboards.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1 to 9. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions of the present disclosure, so that the present disclosure is not limited to the technical essence, and any modifications of the structures, changes of the ratios, or adjustments of the sizes, can still fall within the scope of the present disclosure without affecting the function and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Referring to fig. 1, the object of the present invention is to provide a self-cleaning filtering apparatus, which at least comprises:
a housing; the shell comprises a cylinder body 1, and two ends of the cylinder body 1 are provided with connecting flanges 2 and 3; a waste liquid outlet is arranged on the side wall of the cylinder body 1;
a filter element; the filter element is arranged in the cylinder body 1 and divides the cylinder body into an upper chamber 4 and a lower chamber 5; the filter element comprises:
a fixed shaft 6; the device is fixedly connected with the cylinder body 1 through supporting discs 7 and 12 at two ends, and the supporting discs are in a spoke type structure; generally, a plurality of threaded holes are uniformly formed in the side wall of the cylinder body 1, and the supporting disks 7 and 12 are fixedly connected with the cylinder body 1 through jackscrews; the stationary shaft 6 is fixedly connected to the support discs 7, 12 in the same way.
A material filtering mechanism; the filter material mechanism comprises a shaft sleeve 8, and the shaft sleeve 8 is sleeved on the fixed shaft 6 and can rotate around the fixed shaft 6; the outer wall of the shaft sleeve is uniformly provided with a plurality of spiral fin plates 10; the filter material cylinder body 11 is sleeved outside the spiral fin plate 10; a first sealing plate 9 and a second sealing plate 13 are respectively arranged at two ends of the filter material cylinder 1, at least one sealing plate is detachable for conveniently filling filter materials, and a plurality of water through holes 21 are uniformly formed in the first sealing plate 9 and the second sealing plate 13; the spaces among the filter material cylinder body 11, the first sealing plate 9, the second sealing plate 13 and each two adjacent spiral fin plates 10 form a plurality of filter material placing cavities with the same shape, and each filter material placing cavity is used for placing a filter material;
a waste liquid discharge mechanism; the waste liquid discharge mechanism includes:
the liquid discharge tank 14 is arranged on one side of the filter material cylinder 11 and is fixedly connected with the cylinder 11; a liquid inlet 22 of the sealing plate is attached to the first sealing plate 9, and a liquid outlet 25 of the sealing plate penetrates out of the waste liquid outlet and is used for discharging waste liquid;
a left shutter 23 and a right shutter 24; are respectively arranged at two sides of the liquid discharge tank 14 and are connected with the liquid discharge tank 14; when the liquid inlet 22 of the liquid discharge tank 14 is overlapped or partially overlapped with the liquid inlet of a certain filter material placing cavity, the left shielding plate 23 and the right shielding plate 24 are used for shielding the liquid inlet of the filter material placing cavity adjacent to the filter material placing cavity.
In another embodiment, the waste liquid discharge mechanism further comprises a liquid discharge control device comprising a control cylinder 17; the piston ring 26 of the control oil cylinder 17 divides the inner cavity of the cylinder body of the control oil cylinder into a first chamber 18 and a second chamber 16; the first chamber 18 is communicated with the upper chamber 4 of the cylinder 1 through a pipeline 19, and the second chamber 16 is communicated with the lower chamber 5 of the cylinder 1 through a pipeline 15; -arranging a resilient element in said first chamber 18, one end of which abuts against a piston ring 26; the other end of the elastic element is propped against the upper end of the cylinder body;
a piston rod 26 of the control cylinder 17 is connected to a shutter plate 27, and the shutter plate 27 opens or closes the liquid outlet 25 of the liquid discharge tank 14 when the piston rod 26 reciprocates.
In another embodiment, the resilient element is a spring 20.
In another embodiment, a bearing is mounted between the sleeve 8 and the stationary shaft 6.
In another embodiment, liquid inlet 22 of liquid discharge tank 14 has the same shape as the radial section of the filter material placing cavity.
In another embodiment, the shape of the left shield 23 and the right shield 24 is the same as the radial section shape of the filter material placing cavity.
When the self-cleaning filter device is used, the self-cleaning filter device is connected into a water passing pipeline through the connecting flanges 2 and 3 at two ends, and when liquid passes through the water passing hole 21 of the first sealing plate 9 from the lower cavity 5, enters the filter material placing cavity, is filtered by the filter material and then enters the upper cavity 4; the spiral fin plate 10 is twisted in a spiral shape, so that the filter material mechanism rotates under the action of water flow; when a certain filter material placing cavity coincides or partially coincides with the liquid inlet 22 of the liquid discharge tank 14, because the pressure (water inlet pressure) of the lower cavity 5 is greater than the pressure (water outlet pressure) of the upper cavity 4 and is greater than the external pressure, part of the filtered purified water passes through the liquid discharge tank from the upper cavity 4 after passing through the filter material placing cavity, washes the filter material clean and then is discharged. As the water passing area of the liquid discharge groove 14 is far smaller than the sectional area of the cylinder body 1, most of the purified water can still be ensured to flow out of the water passing pipeline.
The liquid discharge control device has the functions of: when the impurities attached to the filter element are more and more, the pressure difference between the water inlet pressure of the lower chamber 5 and the water outlet pressure of the upper chamber 4 is increased, the piston rod moves upwards by overcoming the pressure of the elastic element, and the flashboard 27 is opened; as the filter material is gradually cleaned, the pressure difference between the water inlet pressure of the lower chamber 5 and the water outlet pressure of the upper chamber 4 is gradually reduced, and when the pressure difference is smaller than the acting force of the elastic element on the piston ring 26, the gate plate 27 moves downwards, and the liquid outlet 25 of the liquid discharge groove 14 is closed. The filter material is circularly cleaned.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (6)
1. A self-cleaning filtration device, comprising at least:
a housing; the shell comprises a cylinder body, and two ends of the cylinder body are provided with connecting flanges; a waste liquid outlet is formed in the side wall of the cylinder body;
a filter element; the filter element is arranged in the cylinder body and divides the cylinder body into an upper chamber and a lower chamber; the filter element comprises:
a fixed shaft; the supporting disc is fixedly connected with the cylinder body through supporting discs at two ends, and the supporting discs are in a spoke type structure;
a material filtering mechanism; the filter material mechanism comprises a shaft sleeve, and the shaft sleeve is sleeved on the fixed shaft and can rotate around the fixed shaft; the outer wall of the shaft sleeve is uniformly provided with a plurality of spiral fin plates; a filter material cylinder is sleeved outside the spiral fin plate; a first sealing plate and a second sealing plate are respectively arranged at two ends of the filter material cylinder, wherein at least one sealing plate is detachable, and a plurality of water through holes are uniformly formed in the first sealing plate and the second sealing plate; the space between the filter material cylinder, the first sealing plate, the second sealing plate and each two adjacent spiral fin plates forms a plurality of filter material placing cavities with the same shape, and each filter material placing cavity is used for placing a filter material;
a waste liquid discharge mechanism; the waste liquid discharge mechanism includes:
the liquid discharge tank is arranged on one side of the filter material cylinder and is fixedly connected with the cylinder; a liquid inlet of the sealing plate is attached to the first sealing plate, and a liquid outlet of the sealing plate penetrates out of the waste liquid outlet and is used for discharging waste liquid;
a left shutter and a right shutter; the liquid discharge grooves are respectively arranged at two sides of the liquid discharge groove and are connected with the liquid discharge groove; when the liquid inlet of the liquid discharge groove is coincided with the liquid inlet of a certain filter material placing cavity or partially coincided, the left shading plate and the right shading plate are used for shading the liquid inlet of the adjacent filter material placing cavity of the filter material placing cavity.
2. The self-cleaning filtration device of claim 1, wherein: the waste liquid discharge mechanism also comprises a liquid discharge control device, and the liquid discharge control device comprises a control oil cylinder; the piston ring of the control oil cylinder divides the inner cavity of the cylinder body of the control oil cylinder into a first cavity and a second cavity; the first cavity is communicated with the upper cavity of the barrel through a pipeline, and the second cavity is communicated with the lower cavity of the barrel through a pipeline; arranging an elastic element in the first chamber, wherein one end of the elastic element is abutted against a piston ring; the other end of the elastic element is propped against the upper end of the cylinder body;
and a piston rod of the control oil cylinder is connected with a flashboard, and the flashboard opens or closes a liquid outlet of the liquid discharge tank when the piston rod reciprocates.
3. The self-cleaning filtration device of claim 2, wherein: the elastic element is a spring.
4. The self-cleaning filtration device according to claim 1 or 2, wherein: and a bearing is arranged between the shaft sleeve and the fixed shaft.
5. The self-cleaning filtration device according to claim 1 or 2, wherein: the shape of the liquid inlet of the liquid discharge groove is the same as the shape of the radial section of the filter material placing cavity.
6. The self-cleaning filtration device of claim 5, wherein: the shape of the left shading plate and the right shading plate is the same as the shape of a radial section of the filter material placing cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911003977.8A CN110743214B (en) | 2019-10-22 | 2019-10-22 | Self-purification type filtering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911003977.8A CN110743214B (en) | 2019-10-22 | 2019-10-22 | Self-purification type filtering device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110743214A true CN110743214A (en) | 2020-02-04 |
| CN110743214B CN110743214B (en) | 2021-07-30 |
Family
ID=69279302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911003977.8A Expired - Fee Related CN110743214B (en) | 2019-10-22 | 2019-10-22 | Self-purification type filtering device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110743214B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624253A (en) * | 2021-02-01 | 2021-04-09 | 南大环境规划设计研究院(江苏)有限公司 | High-concentration organic wastewater purifying equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6878293B1 (en) * | 2002-09-25 | 2005-04-12 | Raymond E. Portyrata | Automatic valve assembly for water circulation systems |
| CN101791498A (en) * | 2010-03-23 | 2010-08-04 | 卢正华 | Valve control filter |
| CN202621029U (en) * | 2012-06-08 | 2012-12-26 | 珠海格力电器股份有限公司 | Flushable external pressure type ultrafiltration filter element assembly and water purifier |
| CN103446891A (en) * | 2012-06-01 | 2013-12-18 | 珠海格力电器股份有限公司 | Flushable external pressure type ultrafiltration filter element assembly and water purifier |
-
2019
- 2019-10-22 CN CN201911003977.8A patent/CN110743214B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6878293B1 (en) * | 2002-09-25 | 2005-04-12 | Raymond E. Portyrata | Automatic valve assembly for water circulation systems |
| CN101791498A (en) * | 2010-03-23 | 2010-08-04 | 卢正华 | Valve control filter |
| CN103446891A (en) * | 2012-06-01 | 2013-12-18 | 珠海格力电器股份有限公司 | Flushable external pressure type ultrafiltration filter element assembly and water purifier |
| CN202621029U (en) * | 2012-06-08 | 2012-12-26 | 珠海格力电器股份有限公司 | Flushable external pressure type ultrafiltration filter element assembly and water purifier |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624253A (en) * | 2021-02-01 | 2021-04-09 | 南大环境规划设计研究院(江苏)有限公司 | High-concentration organic wastewater purifying equipment |
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| Publication number | Publication date |
|---|---|
| CN110743214B (en) | 2021-07-30 |
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| TR01 | Transfer of patent right |
Effective date of registration: 20221215 Address after: 276700 west head of Shuhe street, Linshu County, Linyi City, Shandong Province Patentee after: Linshu Jicai Human Resources Service Co.,Ltd. Address before: 253000 Wang she Cun, huitousi Town, Dezhou Economic and Technological Development Zone, Shandong Province Patentee before: Wang Yongqiang |
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Granted publication date: 20210730 |