CN214514348U - Accurate feeding measurement of powder material is called - Google Patents
Accurate feeding measurement of powder material is called Download PDFInfo
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- CN214514348U CN214514348U CN202023230353.0U CN202023230353U CN214514348U CN 214514348 U CN214514348 U CN 214514348U CN 202023230353 U CN202023230353 U CN 202023230353U CN 214514348 U CN214514348 U CN 214514348U
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- 239000000843 powder Substances 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 title claims abstract description 31
- 238000005259 measurement Methods 0.000 title description 9
- 238000005303 weighing Methods 0.000 claims abstract description 24
- 238000007599 discharging Methods 0.000 claims abstract description 16
- 238000005192 partition Methods 0.000 description 4
- 238000009776 industrial production Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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Abstract
The utility model provides a precise feeding metering scale for powder materials, which comprises a feeding control scale body, a metering scale body and a control module; the feeding control scale body comprises a first scale body shell, a first feeding hole, a first discharging hole and a first motor; a scale body impeller and an annular scale body unit are arranged in the first scale body shell; the scale body impeller is arranged on the upper side of the annular scale body unit, and the scale body impeller and the first scale body shell form a feeding passage, one end of the feeding passage is connected with the first feeding hole, and the other end of the feeding passage is connected with the first discharging hole; the lower part of the annular balance body unit is provided with a weighing sensor, and the impeller of the balance body is provided with a speed sensor; the metering scale body comprises a second scale body shell, a second feeding hole, a second discharging hole and a second motor; a torque sensor is arranged at the rotating shaft of the measuring wheel; the second feed inlet is connected with the first discharge outlet; the control module is connected with the first motor, the second motor, the weighing sensor, the speed sensor, the torque sensor and the HMI terminal.
Description
Technical Field
The utility model belongs to the technical field of the measurement, concretely relates to accurate feed measurement of powder material is called.
Background
In the field of industrial production, powder materials need to be added according to a certain proportion in various processes, and if the adding proportion is not accurate, the quality of finished products is directly influenced, so that the powder materials need to be accurately fed and metered. The powder material is generally a mixture of a plurality of substances, the components of the plurality of mixed substances are unstable, and stable feeding and metering of the powder material are always difficult due to the characteristics of strong flowability and difficult flow control of the powder material.
Therefore, it is very necessary to provide a precise powder feeding and metering scale for the above-mentioned defects in the prior art.
Disclosure of Invention
Need control powder material and add according to the proportion in the above-mentioned industrial production field to prior art, and powder material mobility is strong, and the difficult control of flow leads to the powder material to stabilize the defect that the feed degree of difficulty is big, the utility model provides an accurate feed measurement of powder material is called to solve above-mentioned technical problem.
The utility model provides a precise feeding metering scale for powder materials, which comprises a feeding control scale body, a metering scale body and a control module;
the feeding control scale body comprises a first scale body shell, a first feeding hole, a first discharging hole and a first motor;
a scale body impeller and an annular scale body unit are arranged in the first scale body shell;
the first feed inlet is arranged at the upper part of the first scale body shell, and the first discharge outlet is arranged at the lower part of the first scale body shell;
the scale body impeller is arranged on the upper side of the annular scale body unit, and the scale body impeller and the first scale body shell form a feeding passage, one end of the feeding passage is connected with the first feeding hole, and the other end of the feeding passage is connected with the first discharging hole;
the rotating shaft of the scale body impeller is connected with a first motor;
the lower part of the annular balance body unit is provided with a weighing sensor, and the impeller of the balance body is provided with a speed sensor;
the metering scale body comprises a second scale body shell, a second feeding hole, a second discharging hole and a second motor;
a measuring wheel is arranged in the shell of the second scale body, and the measuring wheel is horizontally arranged; a rotating shaft of the measuring wheel is connected with the second motor, and a torque sensor is arranged at the rotating shaft of the measuring wheel;
the second feed inlet is connected with the first discharge outlet; the second feed port is arranged at the upper part of the second scale body shell, the second discharge port is arranged at the lower part of the second scale body shell, and the measuring wheel is arranged between the second feed port and the first feed port;
the control module is connected with the first motor, the second motor, the weighing sensor, the speed sensor and the torque sensor;
the control module is also connected with an HMI terminal.
Furthermore, the feeding control scale body also comprises a first scale body bracket;
the first scale body shell is arranged on the upper part of the first scale body bracket, and the first motor is arranged on the upper part of the first scale body shell.
Furthermore, the measuring scale body also comprises a second scale body bracket;
the second scale body shell is arranged on the upper portion of the second scale body support, a second motor support is arranged on one side of the second scale body support, and the second motor is arranged on the upper portion of the second motor support.
Furthermore, a plurality of feeding bins are formed between the wheel sheets of the scale body impeller, and the feeding bins are symmetrical around the center of the rotating shaft of the scale body impeller.
Furthermore, the plane of the scale body impeller is parallel to the plane of the annular balance scale body unit, and the rotating shaft of the scale body impeller passes through the center of the annular balance scale body unit.
Furthermore, a partition plate is arranged between the scale body impeller and the annular scale body unit; the dividing plate passes through the center of the scale body impeller and the center of the annular balance scale body unit and divides the space between the scale body impeller and the annular balance scale body unit into two parts;
the first feed inlet and the first discharge outlet are arranged on the same side of the partition plate.
Furthermore, the control module is connected with the first motor through a first frequency converter, and the control module is connected with the second motor through a second frequency converter.
Further, the control module adopts a PLC controller.
Furthermore, the feeding control scale body adopts a rotor scale.
Furthermore, the measuring scale body adopts a Coriolis scale.
The material enters the first scale body shell through the first feeding hole of the feeding control scale body, the rotor scale body impeller is driven to rotate by the first motor, and the feeding speeds are different when the first motor rotates at different speeds; the material enters the feed inlet of the measuring scale body after coming out of the first discharge hole of the feeding control scale body; the second motor of the measuring scale body runs at a constant frequency, a torque sensor is arranged at the bottom of a measuring wheel of the measuring scale body, data measured by the torque sensor is accessed into a control module, and the instantaneous amount of the material passing through the measuring scale body is obtained through conversion;
the HMI terminal is communicated with the control module, and can carry out user set flow set value and flow feedback value display; the control module converts a set flow value set by a user and a detection value of a weighing sensor of the feeding control scale body to obtain a feeding rotating speed, and controls the first motor through the first frequency converter; meanwhile, a flow feedback value obtained by conversion according to a detection value of a torque sensor of the metering scale body is compared with a flow set value, and PID adjustment corrects the feeding rotating speed, so that accurate feeding closed-loop control is realized.
The rotation speed of the second motor of the measuring scale body can be directly set through the HMI terminal, and then the second motor is controlled to run at a set rotation speed and a constant speed through the second frequency converter of the measuring scale body, and the larger the set value of the constant rotation speed is, the larger the measurable flow range is. Because the measurement accuracy is reduced when the deviation between the common flow and the flow range is overlarge, the constant rotating speed set value of the motor of the measuring scale body can be adjusted according to the common flow.
The utility model has the advantages that,
the utility model provides an accurate feed weigher of powder material combines to realize the high accuracy feed through the internal balance body impeller of feed control balance and cyclic annular balance body unit, and realizes the high accuracy measurement through the torque sensor of the measurement balance body, combines control module to carry out PID regulation, realizes accurate feed of powder material and measurement, has satisfied the requirement of industrial production field to accurate batching.
Furthermore, the utility model relates to a principle is reliable, and simple structure has very extensive application prospect.
Therefore, compared with the prior art, the utility model has the substantive characteristics and the progress, and the beneficial effects of the implementation are also obvious.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of the powder material precision feeding scale of the present invention;
fig. 2 is a control schematic diagram of the powder material precision feeding metering scale of the present invention;
FIG. 3 is a schematic view showing the internal structure of the feeding control scale body of the present invention;
FIG. 4 is a schematic diagram of the internal structure of the feeding control scale body of the present invention;
in the figure, 1-a feeding control scale body; 2-a measuring scale body; 3-a first scale body housing; 4-a first feed port; 5-a first discharge hole; 6-a first motor; 7-a second scale body shell; 8-a second feed port; 9-a second discharge hole; 10-a second motor; 11-a first scale body support; 12-a second scale body support; 13-a second motor mount; 14-scale body impeller; 15-ring balance scale body unit; 16-feeding bin; 17-a first frequency converter; 18-a second frequency converter; 19-a measuring wheel; 20-a load cell; 21-a speed sensor; 22-a torque sensor; 23-a control module; 24-HMI terminal; 25-dividing the plate.
Detailed Description
In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below 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, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
Example 1:
as shown in fig. 1, fig. 2, fig. 3 and fig. 4, the utility model provides a precise powder feeding weighing scale, which comprises a feeding control scale body 1, a weighing scale body 2 and a control module 23;
the feeding control scale body 1 comprises a first scale body shell 3, a first feeding hole 4, a first discharging hole 5 and a first motor 6;
a scale body impeller 14 and an annular balance scale body unit 15 are arranged in the first scale body shell 3;
the first feed inlet 4 is arranged at the upper part of the first scale body shell 3, and the first discharge outlet 5 is arranged at the lower part of the first scale body shell 3;
the scale body impeller 14 is arranged on the upper side of the annular scale body unit 15, the scale body impeller 14 and the first scale body shell 3 form a feeding passage, one end of the feeding passage is connected with the first feeding hole 4, and the other end of the feeding passage is connected with the first discharging hole 5;
the rotating shaft of the scale body impeller 14 is connected with the first motor 6;
the lower part of the annular balance body unit 15 is provided with a weighing sensor 20, and the position of the scale body impeller 14 is provided with a speed sensor 21;
the metering scale body 2 comprises a second scale body shell 7, a second feeding hole 8, a second discharging hole 9 and a second motor 10;
a measuring wheel 19 is arranged in the second scale body shell 7, and the measuring wheel 19 is horizontally arranged; the rotating shaft of the measuring wheel 19 is connected with the second motor 10, and a torque sensor 22 is arranged at the rotating shaft of the measuring wheel 19;
the second feed port 8 is connected with the first discharge port 5; the second feed inlet 8 is arranged at the upper part of the second scale body shell 7, the second discharge outlet 9 is arranged at the lower part of the second scale body shell 7, and the measuring wheel 19 is arranged between the second feed inlet 8 and the first feed inlet 9;
the control module 23 is connected with the first motor 6, the second motor 10, the weighing sensor 20, the speed sensor 21 and the torque sensor 22;
the control module 23 is also connected to an HMI terminal 24.
In some embodiments, the feeding control scale body 1 further comprises a first scale body support 11;
the first scale body housing 3 is arranged on the upper part of the first scale body bracket 11, and the first motor 6 is arranged on the upper part of the first scale body housing 3.
In certain embodiments, the weighing scale body 2 further comprises a second scale body support 12;
the second scale body housing 7 is arranged on the upper portion of the second scale body support 12, one side of the second scale body support 12 is provided with a second motor support 13, and the second motor 10 is arranged on the upper portion of the second motor support 13.
In some embodiments, a plurality of feeding chambers 16 are formed between the blades of the scale body impeller 14, and each feeding chamber 16 is symmetrical around the center of the rotating shaft of the scale body impeller 14.
In some embodiments, the plane of the scale body impeller 14 is parallel to the plane of the annular balance scale body unit 15, and the rotation axis of the scale body impeller 14 passes through the center of the annular balance scale body unit 15.
In some embodiments, a dividing plate 25 is arranged between the scale body impeller 14 and the annular scale body unit 15;
the dividing plate 25 passes through the center of the scale body impeller 14 and the center of the annular balance scale body unit 15, and divides the space between the scale body impeller 14 and the annular balance scale body unit 15 into two parts;
the first feed port 4 and the first discharge port 5 are provided on the same side of the dividing plate 25.
In some embodiments, the control module 23 is connected to the first electric machine 6 via a first inverter 17, and the control module 23 is connected to the second electric machine 10 via a second inverter 18.
In certain embodiments, the control module 23 employs a PLC controller.
In some embodiments, the feeding control scale body 1 employs a rotor scale.
In some embodiments, the scale body 2 employs a coriolis scale.
Example 2:
as shown in fig. 1, fig. 2, fig. 3 and fig. 4, the utility model provides a precise powder feeding weighing scale, which comprises a feeding control scale body 1, a weighing scale body 2 and a control module 23;
the feeding control scale body 1 comprises a first scale body shell 3, a first feeding hole 4, a first discharging hole 5 and a first motor 6; the feeding control scale body 1 also comprises a first scale body bracket 11; the feeding control scale body 1 adopts a rotor scale;
the first scale body housing 3 is arranged at the upper part of the first scale body bracket 11, and the first motor 6 is arranged at the upper part of the first scale body housing 3;
a scale body impeller 14 and an annular balance scale body unit 15 are arranged in the first scale body shell 3;
the first feed inlet 4 is arranged at the upper part of the first scale body shell 3, and the first discharge outlet 5 is arranged at the lower part of the first scale body shell 3;
the scale body impeller 14 is arranged on the upper side of the annular scale body unit 15, the scale body impeller 14 and the first scale body shell 3 form a feeding passage, one end of the feeding passage is connected with the first feeding hole 4, and the other end of the feeding passage is connected with the first discharging hole 5;
the rotating shaft of the scale body impeller 14 is connected with the first motor 6;
as shown in fig. 3 and 4, a plurality of feeding chambers 16 are formed between the wheel sheets of the scale body impeller 14, and each feeding chamber 16 is symmetrical around the center of the rotating shaft of the scale body impeller 14;
the plane of the scale body impeller 14 is parallel to the plane of the annular scale body unit 15, and the rotating shaft of the scale body impeller 14 passes through the center of the annular scale body unit 15;
a partition plate 25 is arranged between the scale body impeller 14 and the annular scale body unit 15;
the dividing plate 25 passes through the center of the scale body impeller 14 and the center of the annular balance scale body unit 15, and divides the space between the scale body impeller 14 and the annular balance scale body unit 15 into two parts;
the first feed port 4 and the first discharge port 5 are arranged on the same side of the dividing plate 25;
the lower part of the annular balance body unit 15 is provided with a weighing sensor 20, and the position of the scale body impeller 14 is provided with a speed sensor 21;
the metering scale body 2 comprises a second scale body shell 7, a second feeding hole 8, a second discharging hole 9 and a second motor 10; the measuring scale body 2 adopts a Coriolis scale;
the measuring scale body 2 also comprises a second scale body bracket 12;
the second scale body shell 7 is arranged on the upper part of a second scale body bracket 12, one side of the second scale body bracket 12 is provided with a second motor bracket 13, and the second motor 10 is arranged on the upper part of the second motor bracket 13;
a measuring wheel 19 is arranged in the second scale body shell 7, and the measuring wheel 19 is horizontally arranged; the rotating shaft of the measuring wheel 19 is connected with the second motor 10, and a torque sensor 22 is arranged at the rotating shaft of the measuring wheel 19;
the second feed port 8 is connected with the first discharge port 5; the second feed inlet 8 is arranged at the upper part of the second scale body shell 7, the second discharge outlet 9 is arranged at the lower part of the second scale body shell 7, and the measuring wheel 19 is arranged between the second feed inlet 8 and the first feed inlet 9;
the control module 23 is connected with the first motor 6, the second motor 10, the weighing sensor 20, the speed sensor 21 and the torque sensor 22; the control module 23 adopts a PLC controller;
the control module 23 is also connected with an HMI terminal 24;
the control module 23 is connected to the first electric machine 6 via a first frequency converter 17, and the control module 23 is connected to the second electric machine 10 via a second frequency converter 18.
HMI is the Human Machine Interface for short.
PID is short for percentage integral differential, PID adjustment is a basic adjustment mode of a control system in a classical control theory, and is a linear adjustment rule with proportional, integral and differential functions.
Powder material enters from a first feeding hole 4 of a feeding control scale body 1, flows uniformly in the semi-circle from the first feeding hole 4 to a first feeding hole 5 along with the rotation of a scale body impeller 14, and flows through the part of an annular balance scale body unit 15 on the right side of a partition plate 25, at the moment, the other half of the material on one side of the annular balance scale body unit 15 has no material, so that the annular balance scale body unit 15 loses balance, a weighing sensor 20 is stressed, the weight of the material is detected by the weighing sensor 20 and is sent into a control module 23, meanwhile, a speed sensor 21 sends a detected speed signal into the control module 23, instantaneous flow and cumulative amount are obtained after processing, and the flow can be adjusted by controlling the feeding rotating speed; the scale body impellers 14 of the feeding control scale body 1 are a plurality of feeding bins 16 which are the same in size and are uniformly distributed, so that the feeding control scale body 1 is uniform and stable in feeding and high in feeding precision; on the other hand, because the feeding control scale body 1 is weighed by the annular balance scale body unit 15, but the stress condition of the weighing sensor 20 is easily influenced by the wind pressure of the process system, and whether the pressure of the feeding bin 16 is balanced with that of the first feeding hole 4, whether the wind volume of a dust collecting pipeline of the feeding bin 16 is constant, and whether the wind volume and the wind pressure conveyed by the wind power of the first discharging hole 5 are matched influence the metering of the feeding control scale body 1, the metering of the feeding control scale body 1 is wrong, and the high-precision metering needs to depend on the metering scale body 3;
the measuring wheel 19 of the measuring scale body 3 is driven by a rotating shaft driven by a second motor 10, and powder materials enter from the center of the measuring wheel 19 through a second feeding hole 8 and are thrown out of the rotating measuring wheel 19; the material exerts a force on the blades of the measuring wheel 19, this force being the coriolis force; because the radius of the measuring wheel 19 is fixed, the Coriolis force is obtained by measuring the torque by the torque sensor 22, and the magnitude of the force is proportional to the mass of the material, and the instantaneous flow rate of the material is indirectly obtained by measuring the magnitude of the force. The torque measured by the metering scale body 3 is not influenced by material properties, wind pressure fluctuation, external force and basic vibration, so the metering precision is high.
Although the present invention has been described in detail by referring to the drawings in conjunction with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and substance of the present invention, and these modifications or substitutions are intended to be within the scope of the present invention/any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An accurate powder feeding metering scale is characterized by comprising a feeding control scale body (1), a metering scale body (2) and a control module (23);
the feeding control scale body (1) comprises a first scale body shell (3), a first feeding hole (4), a first discharging hole (5) and a first motor (6);
a scale body impeller (14) and an annular scale body unit (15) are arranged in the first scale body shell (3);
the first feed inlet (4) is arranged at the upper part of the first scale body shell (3), and the first discharge outlet (5) is arranged at the lower part of the first scale body shell (3);
the scale body impeller (14) is arranged on the upper side of the annular scale body unit (15), the scale body impeller (14) and the first scale body shell (3) form a feeding passage, one end of the feeding passage is connected with the first feeding hole (4), and the other end of the feeding passage is connected with the first discharging hole (5);
the rotating shaft of the scale body impeller (14) is connected with the first motor (6);
a weighing sensor (20) is arranged at the lower part of the annular balance body unit (15), and a speed sensor (21) is arranged at the position of the balance body impeller (14);
the metering scale body (2) comprises a second scale body shell (7), a second feeding hole (8), a second discharging hole (9) and a second motor (10);
a measuring wheel (19) is arranged in the second scale body shell (7), and the measuring wheel (19) is horizontally arranged; a rotating shaft of the measuring wheel (19) is connected with the second motor (10), and a torque sensor (22) is arranged at the rotating shaft of the measuring wheel (19);
the second feed inlet (8) is connected with the first discharge outlet (5); the second feed inlet (8) is arranged at the upper part of the second scale body shell (7), the second discharge outlet (9) is arranged at the lower part of the second scale body shell (7), and the measuring wheel (19) is arranged between the second feed inlet (8) and the second discharge outlet (9);
the control module (23) is connected with the first motor (6), the second motor (10), the weighing sensor (20), the speed sensor (21) and the torque sensor (22);
the control module (23) is also connected with an HMI terminal (24).
2. The powder precision feeding metering scale as claimed in claim 1, wherein the feeding control scale body (1) further comprises a first scale body support (11);
the first scale body shell (3) is arranged on the upper part of the first scale body bracket (11), and the first motor (6) is arranged on the upper part of the first scale body shell (3).
3. The precision powder feeding weighing apparatus according to claim 1, wherein the weighing scale body (2) further comprises a second scale body support (12);
the second scale body shell (7) is arranged on the upper portion of the second scale body support (12), a second motor support (13) is arranged on one side of the second scale body support (12), and the second motor (10) is arranged on the upper portion of the second motor support (13).
4. The powder precision feeding metering scale as claimed in claim 1, wherein a plurality of feeding bins (16) are formed between the wheel sheets of the scale body impeller (14), and each feeding bin (16) is centrally symmetrical around the rotating shaft of the scale body impeller (14).
5. The powder material accurate feeding metering balance of claim 4, wherein the plane of the balance body impeller (14) is parallel to the plane of the annular balance body unit (15), and the rotating shaft of the balance body impeller (14) passes through the center of the annular balance body unit (15).
6. The powder precision feeding metering scale as claimed in claim 5, characterized in that a dividing plate (25) is arranged between the scale body impeller (14) and the annular scale body unit (15);
the dividing plate (25) passes through the center of the scale body impeller (14) and the center of the annular balance scale body unit (15), and divides the space between the scale body impeller (14) and the annular balance scale body unit (15) into two parts;
the first feed inlet (4) and the first discharge outlet (5) are arranged on the same side of the dividing plate (25).
7. The powder precision feeding metering scale of claim 1, wherein the control module (23) is connected with the first motor (6) through a first frequency converter (17), and the control module (23) is connected with the second motor (10) through a second frequency converter (18).
8. The powder precision feeding metering scale of claim 1, wherein the control module (23) adopts a PLC controller.
9. The powder precision feeding metering scale as claimed in claim 1, characterized in that the feeding control scale body (1) adopts a rotor scale.
10. A powder precision feeding weighing machine as claimed in claim 1, characterized in that the weighing machine body (2) is a coriolis weighing machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023230353.0U CN214514348U (en) | 2020-12-28 | 2020-12-28 | Accurate feeding measurement of powder material is called |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023230353.0U CN214514348U (en) | 2020-12-28 | 2020-12-28 | Accurate feeding measurement of powder material is called |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214514348U true CN214514348U (en) | 2021-10-29 |
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ID=78297313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023230353.0U Expired - Fee Related CN214514348U (en) | 2020-12-28 | 2020-12-28 | Accurate feeding measurement of powder material is called |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214514348U (en) |
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2020
- 2020-12-28 CN CN202023230353.0U patent/CN214514348U/en not_active Expired - Fee Related
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Granted publication date: 20211029 |