CN213221696U - Homogenizing valve device for processing emulsion - Google Patents
Homogenizing valve device for processing emulsion Download PDFInfo
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- CN213221696U CN213221696U CN202021892167.0U CN202021892167U CN213221696U CN 213221696 U CN213221696 U CN 213221696U CN 202021892167 U CN202021892167 U CN 202021892167U CN 213221696 U CN213221696 U CN 213221696U
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- 239000000839 emulsion Substances 0.000 title claims abstract description 60
- 238000012544 monitoring process Methods 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 9
- 238000007599 discharging Methods 0.000 description 6
- 238000010008 shearing Methods 0.000 description 5
- 238000004880 explosion Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 235000013365 dairy product Nutrition 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
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Abstract
The utility model provides a homogenizing valve device for processing emulsion, including high-pressure pump, homogenizing valve and control system, increased flow sensor on pressure sensor one's basis, flow sensor installs at the feedstock channel inner wall, microprocessor carries out contrastive analysis with the data and the predetermined threshold value that flow sensor one and flow sensor monitored, judges the condition that the internal case of homogenizing valve and valve seat receive the impact better, controls high-pressure pump pressure accurately, protects whole homogenizing valve; and secondly, a second pressure sensor is added, the second pressure sensor is installed on the surface of the impact ring, and the microprocessor compares and analyzes data monitored by the second pressure sensor with a preset threshold value to obtain the impact force directly applied to the impact valve, accurately controls the pressure of the high-pressure pump and protects the impact ring.
Description
Technical Field
The utility model belongs to homogeneity valve field especially relates to a homogeneity valve gear for processing emulsion.
Background
After passing through the homogenizing process, the emulsion high-pressure homogenizer can improve the uniformity and stability of products, increase the retention period and reduce the reaction time, thereby saving a large amount of catalysts or additives, changing the consistency of the products, improving the taste, color and the like of the products, and being widely applied to the production and processing of emulsions in the industries of food, dairy products, beverages, cosmetics and the like.
The existing homogenizing valve for the high-pressure homogenizer bears larger shearing force and impact force during working, and particularly has great damage to an impact ring with the pressure relief effect, so that the service life of the impact ring is shortened, the replacement is frequent, and the continuity of product production is seriously influenced. In order to reduce the damage of the whole homogenizing valve, especially the impact ring, in the prior art, a pressure sensor is used for monitoring the pressure of a high-pressure pump connected with the homogenizing valve, and the pressure of the emulsion is controlled by controlling the pressure of the high-pressure pump, so that the damage of the homogenizing valve, especially the impact ring, caused by the overlarge pressure of the emulsion and the overlarge impact force on the impact ring is prevented, but the prior art has the following two technical problems: firstly, whether a homogenizing valve, particularly an impact ring, is in a bearable impact force range or not is judged according to pressure data of a high-pressure pump monitored by a pressure sensor, so that the impact condition of a valve core and a valve seat in the homogenizing valve cannot be accurately obtained, and the whole homogenizing valve cannot be protected; secondly, whether the homogenizing valve, particularly the impact ring, is in a bearable impact force range or not is judged according to pressure data of the high-pressure pump monitored by a pressure sensor, the impact force directly borne by the impact valve cannot be obtained, and the pressure of the high-pressure pump cannot be accurately controlled.
Disclosure of Invention
The utility model discloses make the improvement to above-mentioned prior art's problem, the utility model aims to solve the problem that a homogeneity valve gear for processing emulsion is provided, two following technical problems have been solved: firstly, the flow velocity sensor is added to better judge the impact condition of the valve core and the valve seat in the homogenizing valve, accurately control the pressure of the high-pressure pump and protect the whole homogenizing valve; secondly, the impact force directly received by the impact valve is obtained by adding a pressure sensor, the pressure of the high-pressure pump is accurately controlled, and the impact ring is protected.
For solving the first technical problem, the utility model discloses a technical scheme one: a homogenizing valve apparatus for processing an emulsion includes a high pressure pump, a homogenizing valve, and a control system. The high-pressure pump passes through pipe connection on the homogeneity valve, the homogeneity valve includes valve base, disk seat, impact ring and case, and the disk seat sets up on the valve base, is provided with the feedstock channel who link up disk seat front end face and disk seat rear end face along the axial in the disk seat, is provided with a step face in the outer peripheral face of disk seat and the position that is located feedstock channel exit end, and the impact ring is located between disk seat and the valve base, and the side of step face is parallel with feedstock channel's axial, and the bottom surface of step face is perpendicular with feedstock channel's axial. The impact ring is sleeved outside the side face of the step face, the rear end face of the impact ring is exposed out of the plane where the rear end face of the valve seat is located, the outer diameter of the impact ring is equal to that of the front end face of the valve seat, and the front end face of the impact ring is in contact with the bottom face of the step face. A slit is formed among the valve seat, the impact ring and the valve core, the front end face of the valve core is opposite to the rear end face of the valve seat, the diameter of the valve core is equal to the outer diameter of the rear end face of the valve seat, and the front end face of the valve core is in contact with the rear end face of the valve seat. The diameter of the front end surface of the valve core is larger than the inner diameter of the outlet end of the feeding channel of the valve seat. Control system includes pressure sensor one, flow rate sensor, microprocessor, acousto-optic warning lamp one and acousto-optic warning lamp two, pressure sensor one installs the pipeline inner wall between high-pressure pump and homogeneity valve, pressure sensor one is used for monitoring the pressure of interior emulsion of pipeline to the pipeline inner wall, flow rate sensor installs at the feedstock channel inner wall, flow rate sensor is arranged in monitoring the velocity of flow of emulsion among the feedstock channel, pressure sensor one's output, flow rate sensor's output is connected with microprocessor through the signal line respectively, acousto-optic warning lamp one, acousto-optic warning lamp two is connected with the switch respectively, and the switch all is connected with the microprocessor electricity.
In the first technical scheme, the homogenizing valve device for processing the emulsion has the following working process: when the high-pressure pump works, the high-pressure pump forms extremely high pressure on the emulsion, the emulsion with high pressure enters the feeding channel of the valve seat through the pipeline, when the material with high speed and high pressure enters along the feeding channel, the material with high speed and high pressure impacts the front end surface of the valve core, and a gap is squeezed between the front end surface of the valve core and the rear end surface of the valve seat, at the moment, the high-speed and high-pressure emulsion is diffused to the periphery along the outlet end of the feeding channel, the high-speed and high-pressure flowing emulsion is collided to the inner annular surface of the impact ring, namely, strong cavitation action similar to explosion effect is generated in a slit formed among the valve seat, the impact ring and the valve core, simultaneously, along with the shearing action and the high-speed impact action generated by the materials through a narrow space formed between the inner ring surface of the impact ring and the side surface of the step surface of the valve seat, so that the solid particles of the material are ultra-finely divided and discharged from the discharging channel. The first pressure sensor inputs the pressure data of the emulsion in the pipeline, monitored in real time, to the inner wall of the pipeline into the microprocessor, the flow rate sensor inputs the flow rate data of the emulsion in the feeding channel, monitored in real time into the microprocessor, the microprocessor analyzes the two data, and if the pressure data of the emulsion in the pipeline, monitored in real time by the first pressure sensor, to the inner wall of the pipeline is larger than a first pressure threshold value preset by the microprocessor, the microprocessor controls the first acousto-optic alarm lamp to give an alarm to remind a worker to adjust the pressure. And if the flow rate data of the emulsion in the feeding channel monitored by the flow rate sensor in real time is larger than the flow rate threshold preset by the microprocessor, the microprocessor controls the acousto-optic alarm lamp II to give an alarm to remind a worker to adjust the pressure.
For solving the second technical problem, the utility model discloses a technical scheme two: the utility model provides a homogeneity valve gear for processing emulsion, control system still includes pressure sensor two, acousto-optic warning lamp three, and pressure sensor two is installed on striking ring surface, and pressure sensor two is used for monitoring the impact force that the striking ring received, and pressure sensor two's output is connected with microprocessor through the signal line, and acousto-optic warning lamp three is connected with the switch, and the switch all is connected with microprocessor.
In the second technical scheme, the homogeneous valve device for processing the emulsion has the following working process: when the high-pressure pump works, the high-pressure pump forms extremely high pressure on the emulsion, the emulsion with high pressure enters the feeding channel of the valve seat through the pipeline, when the material with high speed and high pressure enters along the feeding channel, the material with high speed and high pressure impacts the front end surface of the valve core, and a gap is squeezed between the front end surface of the valve core and the rear end surface of the valve seat, at the moment, the high-speed and high-pressure emulsion is diffused to the periphery along the outlet end of the feeding channel, the high-speed and high-pressure flowing emulsion is collided to the inner annular surface of the impact ring, namely, strong cavitation action similar to explosion effect is generated in a slit formed among the valve seat, the impact ring and the valve core, simultaneously, along with the shearing action and the high-speed impact action generated by the materials through a narrow space formed between the inner ring surface of the impact ring and the side surface of the step surface of the valve seat, so that the solid particles of the material are ultra-finely divided and discharged from the discharging channel. The pressure sensor I inputs the pressure data of the emulsion in the pipeline, monitored in real time, to the inner wall of the pipeline, the flow rate sensor inputs the flow rate data of the emulsion in the feeding channel, monitored in real time, to the microprocessor, the pressure sensor II inputs the impact force data of the impact ring, monitored in real time, to the microprocessor, the microprocessor analyzes the three data, and if the pressure data of the emulsion in the pipeline, monitored in real time by the pressure sensor I, to the inner wall of the pipeline is larger than a pressure threshold value I preset by the microprocessor, the microprocessor controls an acousto-optic alarm lamp I to give an alarm to remind a worker of adjusting the pressure. And if the flow rate data of the emulsion in the feeding channel monitored by the flow rate sensor in real time is larger than the flow rate threshold preset by the microprocessor, the microprocessor controls the acousto-optic alarm lamp II to give an alarm to remind a worker to adjust the pressure. If the impact force data of the impact ring monitored by the pressure sensor II in real time is larger than the pressure threshold value II preset by the microprocessor, the microprocessor controls the acousto-optic alarm lamp III to give an alarm to remind a worker to adjust the pressure.
Preferably, in the first and second technical solutions, the valve seat, the impact ring, and the valve are made of ceramics.
Preferably, in the first technical scheme and the second technical scheme, the valve seat, the valve core and the impact ring are coaxially arranged.
Preferably, in the first technical solution and the second technical solution, the microprocessor is a digital signal processor.
The utility model has the advantages and positive effects that: firstly, a flow velocity sensor is added on the basis of a pressure sensor I, the flow velocity sensor is installed on the inner wall of a feeding channel, and a microprocessor compares data monitored by the pressure sensor I and the flow velocity sensor with a preset threshold value for analysis, so that the impact condition of a valve core and a valve seat in a homogenizing valve is better judged, the pressure of a high-pressure pump is accurately controlled, and the whole homogenizing valve is protected; and secondly, a second pressure sensor is added, the second pressure sensor is installed on the surface of the impact ring, and the microprocessor compares and analyzes data monitored by the second pressure sensor with a preset threshold value to obtain the impact force directly applied to the impact valve, accurately controls the pressure of the high-pressure pump and protects the impact ring.
Drawings
FIG. 1 is a sectional view of a homogenizing valve and a pipe according to example 1 of the present invention
FIG. 2 is a schematic diagram of a control system according to embodiment 1 of the present invention
FIG. 3 is a sectional view of a homogenizing valve and a pipe according to example 2 of the present invention
Fig. 4 is a schematic diagram of a control system in embodiment 2 of the present invention.
In the figure: 1. a discharge channel; 2. a valve core; 3. a valve base; 4. an impact ring; 5. a valve seat; 6. feeding materials; 7. a pipeline; 8. a first pressure sensor; 9. a flow rate sensor; 10. a microprocessor; 11. a first acousto-optic alarm lamp; 12. a sound and light alarm lamp II; 13. a second pressure sensor; 14. a sound and light alarm lamp III; 15. a step surface.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Example 1 a homogenizing valve assembly for processing an emulsion, as shown in figures 1 and 2, includes a high pressure pump, a homogenizing valve, and a control system. The high-pressure pump passes through pipeline 7 and connects on the homogeneity valve, the homogeneity valve includes valve base 3, valve seat 5, impingement ring 4 and case 2, valve seat 5 sets up on valve base 3, be provided with in the valve seat 5 along the axial feed channel 6 who link up preceding terminal surface of valve seat 5 and 5 rear end faces of valve seat, be provided with a step face 15 in the position of the outer peripheral face of valve seat 5 and the exit end that is located feed channel 6, impingement ring 4 is located between valve seat 5 and the valve base 3, the side of step face 15 is parallel with the axial of feed channel 6, the bottom surface of step face 15 is perpendicular with the axial of feed channel 6. The impact ring 4 is sleeved outside the side face of the step face 15, the rear end face of the impact ring 4 is exposed out of the plane of the rear end face of the valve seat 5, the outer diameter of the impact ring 4 is equal to that of the front end face of the valve seat 5, and the front end face of the impact ring 4 is in contact with the bottom face of the step face 15. Wherein, a slit is formed among the valve seat 5, the impact ring 4 and the valve core 2, the front end surface of the valve core 2 is right opposite to the rear end surface of the valve seat 5, the diameter of the valve core 2 is equal to the outer diameter of the rear end surface of the valve seat 5, and the front end surface of the valve core 2 is contacted with the rear end surface of the valve seat 5. The diameter of the front end face of the valve core 2 is larger than the inner diameter of the outlet end of the feed channel 6 of the valve seat 5. Control system includes pressure sensor 8, flow rate sensor 9, microprocessor 10, acousto-optic warning lamp 11 and acousto-optic warning lamp two 12, 7 inner walls of pipeline between high-pressure pump and homogeneity valve are installed to pressure sensor 8, pressure sensor 8 is arranged in monitoring 7 interior emulsions of pipeline to the pressure of pipeline 7 inner walls, flow rate sensor 9 installs at 6 inner walls of feedstock channel, flow rate sensor 9 is arranged in monitoring 6 interior emulsions's of feedstock channel velocity, pressure sensor 8's output, flow rate sensor 9's output is connected with microprocessor 10 through the signal line respectively, acousto-optic warning lamp 11, acousto-optic warning lamp two 12 are connected with the switch respectively, and the switch all is connected with microprocessor 10 electricity.
In example 1, a homogeneous valve device for processing an emulsion works as follows: the high-pressure pump forms extremely high pressure to emulsion when working, the emulsion with high pressure enters a feeding channel 6 of a valve seat 5 through a pipeline 7, when a material with high speed and high pressure enters along the feeding channel 6, the high-speed high-pressure emulsion impacts the front end surface of a valve core 2 at high speed, a gap is extruded between the front end surface of the valve core 2 and the rear end surface of the valve seat 5, the emulsion with high speed and high pressure at the moment is diffused to the periphery along the outlet end of the feeding channel 6, the emulsion flowing at high speed and high pressure impacts the inner annular surface of an impact ring 4, namely, a strong cavitation similar to an explosion effect is generated in the gap formed among the valve seat 5, the impact ring 4 and the valve core 2, meanwhile, the shearing effect and the high-speed impact effect are generated by the material through a narrow space formed between the inner annular surface of the impact ring 4 and the side surface of a step surface 15 of the valve seat, discharging from the discharging channel 1. The first pressure sensor 8 inputs the pressure data of the emulsion in the pipeline 7 monitored in real time on the inner wall of the pipeline 7 into the microprocessor 10, the flow rate sensor 9 inputs the flow rate data of the emulsion in the feeding channel 6 monitored in real time into the microprocessor 10, the microprocessor 10 analyzes the two data, if the pressure data of the emulsion in the pipeline 7 monitored in real time by the first pressure sensor 8 on the inner wall of the pipeline 7 is larger than a first pressure threshold value preset by the microprocessor 10, the microprocessor 10 controls the first acousto-optic alarm lamp 11 to give an alarm to remind a worker of adjusting the pressure. If the flow rate data of the emulsion in the feeding channel 6 monitored by the flow rate sensor 9 in real time is larger than the flow rate threshold preset by the microprocessor 10, the microprocessor 10 controls the acousto-optic alarm lamp II 12 to give an alarm to remind a worker to adjust the pressure.
In example 2, a homogeneous valve device for processing an emulsion works as follows: the high-pressure pump forms extremely high pressure to emulsion when working, the emulsion with high pressure enters a feeding channel 6 of a valve seat 5 through a pipeline 7, when a material with high speed and high pressure enters along the feeding channel 6, the high-speed high-pressure emulsion impacts the front end surface of a valve core 2 at high speed, a gap is extruded between the front end surface of the valve core 2 and the rear end surface of the valve seat 5, the emulsion with high speed and high pressure at the moment is diffused to the periphery along the outlet end of the feeding channel 6, the emulsion flowing at high speed and high pressure impacts the inner annular surface of an impact ring 4, namely, a strong cavitation similar to an explosion effect is generated in the gap formed among the valve seat 5, the impact ring 4 and the valve core 2, meanwhile, the shearing effect and the high-speed impact effect are generated by the material through a narrow space formed between the inner annular surface of the impact ring 4 and the side surface of a step surface 15 of the valve seat, discharging from the discharging channel 1. The pressure sensor I8 inputs the pressure data of the emulsion in the pipeline 7 monitored in real time on the inner wall of the pipeline 7 into the microprocessor 10, the flow rate sensor 9 inputs the flow rate data of the emulsion in the feeding channel 6 monitored in real time into the microprocessor 10, the pressure sensor II 13 inputs the impact force data of the impact ring 4 monitored in real time into the microprocessor 10, the microprocessor 10 analyzes the three data, if the pressure data of the emulsion in the pipeline 7 monitored in real time by the pressure sensor I8 on the inner wall of the pipeline 7 is larger than a pressure threshold value I preset by the microprocessor 10, the microprocessor 10 controls the acousto-optic alarm lamp I11 to give an alarm to remind a worker of adjusting the pressure. If the flow rate data of the emulsion in the feeding channel 6 monitored by the flow rate sensor 9 in real time is larger than the flow rate threshold preset by the microprocessor 10, the microprocessor 10 controls the acousto-optic alarm lamp II 12 to give an alarm to remind a worker to adjust the pressure. If the impact force data of the impact ring 4 monitored by the second pressure sensor 13 in real time is larger than the second pressure threshold preset by the microprocessor 10, the microprocessor 10 controls the third acousto-optic alarm lamp 14 to give an alarm to remind a worker to adjust the pressure.
Preferably, in embodiments 1 and 2, the valve seat 5, the impact ring 4, and the valve element 2 are made of ceramics.
Preferably, in embodiment 1 and embodiment 2, the valve seat 5, the valve element 2, and the impact ring 4 are coaxially disposed.
Preferably, in embodiments 1 and 2, the microprocessor 10 is a digital signal processor.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.
Claims (5)
1. A homogenizing valve apparatus for processing an emulsion, characterized by: the high-pressure pump is connected to the homogenizing valve through a pipeline (7), the homogenizing valve comprises a valve base (3), a valve seat (5), an impact ring (4) and a valve core (2), the valve seat (5) is arranged on the valve base (3), a feeding channel (6) which penetrates through the front end face of the valve seat (5) and the rear end face of the valve seat (5) along the axial direction is arranged in the valve seat (5), a step face (15) is arranged on the outer peripheral face of the valve seat (5) and at the outlet end of the feeding channel (6), the impact ring (4) is located between the valve seat (5) and the valve base (3), the side face of the step face (15) is parallel to the axial direction of the feeding channel (6), the bottom face of the step face (15) is perpendicular to the axial direction of the feeding channel (6), the impact ring (4) is sleeved on the outer side of the side face of the step face (15), the rear end face of the impact ring (4) is exposed out of the plane where the rear end face of the valve seat (5) is located, the outer diameter of the impact ring (4) is equal to the outer diameter of the front end face of the valve seat (5), the front end face of the impact ring (4) is in contact with the bottom face of the step face (15), a slit is formed among the valve seat (5), the impact ring (4) and the valve core (2), the front end face of the valve core (2) is opposite to the rear end face of the valve seat (5), the diameter of the valve core (2) is equal to the outer diameter of the rear end face of the valve seat (5), the front end face of the valve core (2) is in contact with the rear end face of the valve seat (5), and the diameter of the front end face of the valve core (2) is larger than the inner diameter of the outlet end of the feed channel, the control system comprises a first pressure sensor (8), a flow rate sensor (9), a microprocessor (10), a first acousto-optic alarm lamp (11) and a second acousto-optic alarm lamp (12), the first pressure sensor (8) is arranged on the inner wall of the pipeline (7) between the high-pressure pump and the homogenizing valve, the first pressure sensor (8) is used for monitoring the pressure of the emulsion in the pipeline (7) on the inner wall of the pipeline (7), the flow rate sensor (9) is arranged on the inner wall of the feeding channel (6), the output end of the first pressure sensor (8) and the output end of the flow velocity sensor (9) are respectively connected with the microprocessor (10) through signal lines, the acousto-optic alarm lamp I (11) and the acousto-optic alarm lamp II (12) are respectively connected with a switch, and the switches are electrically connected with the microprocessor (10).
2. A homogenizing valve device for processing an emulsion according to claim 1, characterized in that: the control system further comprises a second pressure sensor (13) and a third acousto-optic alarm lamp (14), the second pressure sensor (13) is installed on the surface of the impact ring (4), the output end of the second pressure sensor (13) is connected with the microprocessor (10) through a signal line, the third acousto-optic alarm lamp (14) is connected with a switch, and the switch is connected with the microprocessor (10).
3. A homogenizing valve device for processing emulsion according to claim 1 or 2, characterized in that: the valve seat (5), the impact ring (4) and the valve core (2) are all made of ceramics.
4. A homogenizing valve device for processing emulsion according to claim 1 or 2, characterized in that: the valve seat (5), the valve core (2) and the impact ring (4) are coaxially arranged.
5. A homogenizing valve device for processing emulsion according to claim 1 or 2, characterized in that: the microprocessor (10) is a digital signal processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021892167.0U CN213221696U (en) | 2020-09-02 | 2020-09-02 | Homogenizing valve device for processing emulsion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021892167.0U CN213221696U (en) | 2020-09-02 | 2020-09-02 | Homogenizing valve device for processing emulsion |
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| Publication Number | Publication Date |
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| CN213221696U true CN213221696U (en) | 2021-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021892167.0U Expired - Fee Related CN213221696U (en) | 2020-09-02 | 2020-09-02 | Homogenizing valve device for processing emulsion |
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| Country | Link |
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| CN (1) | CN213221696U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115228316A (en) * | 2022-08-15 | 2022-10-25 | 南京大地水刀股份有限公司 | Ultrahigh pressure jet beam impact, air explosion and shearing combined type homogenizing method and homogenizing head |
-
2020
- 2020-09-02 CN CN202021892167.0U patent/CN213221696U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115228316A (en) * | 2022-08-15 | 2022-10-25 | 南京大地水刀股份有限公司 | Ultrahigh pressure jet beam impact, air explosion and shearing combined type homogenizing method and homogenizing head |
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Granted publication date: 20210518 |