CN110864153A - Locking structure of multi-rotary valve electric actuator - Google Patents
Locking structure of multi-rotary valve electric actuator Download PDFInfo
- Publication number
- CN110864153A CN110864153A CN201810984870.5A CN201810984870A CN110864153A CN 110864153 A CN110864153 A CN 110864153A CN 201810984870 A CN201810984870 A CN 201810984870A CN 110864153 A CN110864153 A CN 110864153A
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- locking
- gear
- clutch
- connecting rod
- electric actuator
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- 239000000835 fiber Substances 0.000 claims description 3
- 241000446313 Lamella Species 0.000 claims 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
- F16K31/05—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor specially adapted for operating hand-operated valves or for combined motor and hand operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
- F16K31/047—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/53—Mechanical actuating means with toothed gearing
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanically-Actuated Valves (AREA)
Abstract
The invention provides a locking structure of a multi-rotary valve electric actuator, which comprises a connecting rod, a locking mechanism and a locking mechanism, wherein the connecting rod comprises a spline section, and a torque gear capable of moving along the length direction of the connecting rod is sleeved on the spline section; the locking unit comprises a locking ring which can hold the connecting rod tightly; the manual gear is arranged on the periphery of the torque gear, and a gap is reserved between the manual gear and the torque gear; a clutch unit including a clutch gear that can simultaneously engage or disengage the torque gear and the manual gear; when the manual gear and the torque gear are meshed with the clutch gear, the locking unit does not tightly hold the connecting rod, and when the clutch gear is separated from the manual gear and the torque gear, the locking unit tightly holds the connecting rod. According to the locking structure of the multi-rotary valve electric actuator, the clutch unit and the locking unit are matched, so that the electric actuator can rapidly adjust the valve in a manual mode, and meanwhile, a connecting rod can be locked after adjustment, and the mode of valve state change.
Description
Technical Field
The invention belongs to the field of valve electric actuators, and particularly relates to a locking structure of a multi-rotary valve electric actuator.
Background
The multi-rotary valve is switched to be opened and closed by lifting or lowering the valve rod, the conventional multi-rotary valve electric actuator usually utilizes the rotation of the screw rod structure to generate displacement to control the opening and closing of the valve, but when the electric actuator is powered off, the electric actuator is required to be manually operated to adjust the opening and closing of the valve or the opening amount of the valve, the electric actuator is not favorably locked, the valve is not closed tightly or the flow of fluid is changed, and the production is influenced.
Disclosure of Invention
In view of the above, the present invention is directed to a locking structure of a multi-rotary valve electric actuator, so as to lock a valve rod after a valve is manually adjusted in case of power failure, and prevent the valve rod from slowly sliding downward due to its own weight.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a locking structure of multi-rotary valve electric actuator comprises
The connecting rod comprises a spline section, and a torque gear capable of moving along the length direction of the connecting rod is sleeved on the spline section;
the locking unit comprises a locking ring which can hold the connecting rod tightly;
the manual gear is arranged on the periphery of the torque gear, and a gap is reserved between the manual gear and the torque gear;
a clutch unit including a clutch gear that can simultaneously engage or disengage the torque gear and the manual gear;
when the manual gear and the torque gear are meshed with the clutch gear, the locking unit does not tightly hold the connecting rod, and when the clutch gear is separated from the manual gear and the torque gear, the locking unit tightly holds the connecting rod. The valve rod of the valve is connected by the connecting rod, the locking unit is separated from the connecting rod in a manual mode of the electric actuator, so that the manual mode operation is more convenient, and meanwhile, the connecting rod is tightly held by the locking ring after the valve is manually adjusted, so that the state of the valve is prevented from being changed due to self reasons.
Furthermore, the locking ring comprises two locking petals which can be close to or far away from each other, a locking rod extends from the end part of each locking petal, and the tail ends of the two locking rods are far away from each other to form a locking gap;
a trapezoidal round platform can get into in the locking clearance, and trapezoidal round platform lateral wall can tightly support in two locking levers. For the locking ring to be completely disengaged from the connecting rod in the manual mode.
Furthermore, each locking rod is provided with a hinge point in the middle, a spring is arranged between the two locking rods, and two ends of the spring respectively abut against the hinge point of the two locking rods and the locking valve. The locking device is used for separating the two locking petals when the trapezoidal boss is separated from the locking gap.
Furthermore, two locking levers all extend a spacing nail relatively, the both ends of spring cup joint respectively on two fibre nails.
Furthermore, the clutch unit further comprises a clutch rod, one end of the clutch rod is fixedly connected with the clutch gear in a coaxial mode, the locking circular truncated cone is fixedly connected with the other end of the clutch rod, and the clutch rod can reciprocate along the length direction.
Furthermore, the clutch unit further comprises a U-shaped frame and a clutch rod sleeve, the two end parts of one side of the opening of the U-shaped frame are provided with oblong holes, the middle part of the clutch rod sleeve is hinged with the U-shaped frame at the oblong holes, one end of the clutch rod sleeve is in contact with the trapezoidal round table, and the other end of the clutch rod sleeve is in contact with the clutch gear.
Furthermore, one side of the closed opening of the U-shaped frame is connected with a handle and used for conveniently controlling the clutch lever to move up and down.
Further, the manual gear is coaxially connected with a hand wheel. For controlling the rotation of the manual gear.
Further, the connecting rod still includes the screw thread section, the locking ring can hold the connecting rod tightly in the screw thread section. The connecting rod can still move up and down under the driving of external force in a locking state.
Furthermore, the inner side of the locking flap is fixedly provided with an anti-slip strip.
Compared with the prior art, the locking structure of the multi-rotary valve electric actuator has the following advantages:
the clutch lever and the locking lever are matched, so that the electric actuator can quickly adjust the valve in a manual mode, and can lock the connecting rod after adjustment, and the state of the valve is changed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of a locking unit;
fig. 3 is a sectional view of the clutch unit.
Description of reference numerals:
1-a connecting rod; 11-a spline section; 12-a thread segment; 13-torque gear; 2-a clutch unit; 21-clutch gear; 22-a handle; 23-a U-shaped frame; 231-oblong holes; 24-a trapezoidal truncated cone; 25-a clutch lever; 26-a clutch lever sleeve; 3-a locking unit; 31-a locking ring; 311-locking lobes; 32-a locking lever; 33-hinge point; 34-fiber nails; 35-a spring; 36-locking clearance; 37-antislip strips; 4-a manual gear; 41-hand wheel.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
A locking structure of a multi-rotary valve electric actuator comprises a connecting rod 1 capable of moving along the length direction, one end of the connecting rod 1 can be connected with a valve rod of a valve, the connecting rod 1 is provided with a threaded section 12 and a spline section 11, a torque gear 13 capable of moving along the length direction of the connecting rod 1 is sleeved on the spline section 11, and the torque gear 13 is provided with an internal spline so as to facilitate the synchronous movement of the connecting rod 1;
a clutch unit 2 is arranged on the side of the connecting rod 1, the clutch unit 2 comprises a clutch rod 25 arranged in parallel with the connecting rod 1, the clutch rod 25 can move along the length direction of the clutch rod 25, one end of the clutch rod 25 is provided with a clutch gear 21, and the other end of the clutch rod 25 is coaxially provided with a trapezoidal round table 24; the clutch unit 2 further comprises a U-shaped frame 23 and a clutch rod sleeve 26, the clutch rod sleeve 26 is coaxially sleeved outside the clutch rod 25, two ends of an opening of the U-shaped frame 23 are provided with long round holes 231, a pin shaft penetrates through the long round holes 231 and the side wall of the clutch rod sleeve 26 to enable the clutch rod sleeve 26 to be hinged to the U-shaped frame 23, a handle 22 extends out of a closed end of the U-shaped frame 23, the handle 22 controls the clutch rod 25 to move up and down through the U-shaped frame 23, the clutch rod sleeve 26 is in contact with the lower surface of the trapezoidal circular truncated cone 24 and the upper surface of the clutch gear 21, the clutch rod 25 is not influenced to rotate in the clutch rod sleeve 26, the clutch wheel and the clutch rod 25 are integrated, and the trapezoidal circular truncated cone 24 is in threaded connection with. (ii) a
A hand-operated gear 4 and a hand wheel 41 coaxial coupling, it is gapped between hand-operated gear 4 and the moment of torsion gear 13, clutching gear 21 and hand-operated gear 4 can mesh simultaneously, and when rotating hand wheel 41, can drive moment of torsion gear 13 through gear drive and rotate, and then drive connecting rod 1 through the spline and rotate, make connecting rod 1 reciprocate through the rotation of connecting rod 1 screw thread section 12.
The circumference of the connecting rod 1 is provided with a locking unit 3 capable of preventing the connecting rod 1 from rotating, the locking unit 3 comprises a locking ring 31 capable of encircling the threaded section 12 of the connecting rod 1, the locking ring 31 comprises two locking petals 311 which are symmetrical to each other, the same ends of the two locking petals 311 extend out of locking rods 32 which are parallel to each other, the middle part of each locking rod 32 is provided with a hinge point 33, a limit nail extends out of the other locking rod 32 between the hinge point 33 and the locking petals 311 on each locking rod 32, the two limit nails are oppositely arranged, two ends of a spring 35 are respectively sleeved on the two limit nails, and the spring 35 is used for separating the two locking petals 311 in a state that locking is not required; the tails of the two locking rods 32 extend towards two sides respectively to form a locking gap 36, the trapezoidal round platforms 24 can be arranged in the locking gap 36, and the side walls of the trapezoidal round platforms 24 can enable the tails of the locking rods 32 to be separated towards two sides, so that the locking petals 311 at the other ends are close to each other until the screw sections of the connecting rods 1 are tightly held, the screw cannot rotate or slide due to dead weight and other reasons under the state without external force, and the opening amount of the valve is ensured.
And anti-slip strips 37 are fixedly arranged on the inner sides of the locking flaps 311.
The locking structure of the multi-rotary valve electric actuator further comprises a shell, the handle 22 penetrates out of the shell and is hinged with the side wall of the shell, and the threaded section 12 of the connecting rod 1 is in threaded connection with the shell so as to realize the up-and-down movement of the connecting rod 1 and limit the connecting rod 1 in the rotating process of the connecting rod 1.
In the locking structure of the multi-rotary-valve electric actuator, the valve rod is driven by the connecting rod 1 to control the opening and closing of the valve, and the connection mode of the valve rod and the connecting rod 1, the connection mode of the motor and the connecting rod 1 and the like are the prior art. In addition, in the electric mode, the locking ring 31 is always kept in the locking state, but the screw rotation is not affected by the intervention of the output shaft of the motor, namely, external force, which is similar to the matching relationship of the self-locking nut and the bolt.
In the manual mode of the electric actuator, the handle 22 is firstly pulled to move the clutch lever 25, the trapezoidal round platform 24 is separated from the locking gap 36, the spring 35 is expanded outwards to separate the locking lobes 311 from each other and separate the locking lobes from the connecting rod 1, the locking state is released, the clutch gear 21 is simultaneously engaged with the manual gear 4 and the torque gear 13 to reduce the resistance of the electric actuator operated in the manual mode, the handle 22 is pulled after the valve is adjusted to separate the clutch gear 21 from the manual gear 4 and the torque gear 13, and the round platform is pushed into the locking gap 36 to enable the locking ring 31 to tightly hold the connecting rod 1.
The hand wheel 41 is arranged outside the housing.
The shell is provided with a limiting device of the handle 22, the limiting device is used for preventing the handle 22 from being turned over due to factors such as self gravity and the like, the limiting device can be arranged outside the shell to limit the handle 22 per se, and can also be arranged in the shell to limit the hinged position of the handle 22 and the shell.
The connection of the end of the connecting rod 1 to the valve stem is known in the art and is carried out in a manner that is fixed to or supported by the housing.
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 (10)
1. The utility model provides a many gyration valve electric actuator locking structure which characterized in that: comprises that
The connecting rod (1) comprises a spline section (11), and a torque gear (13) capable of moving along the length direction of the connecting rod (1) is sleeved on the spline section (11);
the locking unit (3) comprises a locking ring (31) which can hold the connecting rod (1) tightly;
the manual gear (4) is arranged on the circumferential side of the torque gear (13) and has a gap with the torque gear (13);
a clutch unit (2) comprising a clutch gear (21), the clutch gear (21) being capable of engaging or disengaging simultaneously the torque gear (13) and the manual gear (4);
when the manual gear (4) and the torque gear (13) are meshed with the clutch gear (21), the locking unit (3) does not tightly hold the connecting rod (1), and when the clutch gear (21) is separated from the manual gear (4) and the torque gear (13), the locking unit (3) tightly holds the connecting rod (1).
2. The locking structure of the multi-rotary valve electric actuator according to claim 1, wherein: the locking ring (31) comprises two locking petals (311) which can be close to or far away from each other, a locking rod (32) extends from the end part of each locking petal (311), and the tail ends of the two locking rods (32) are far away from each other to form a locking gap (36);
a trapezoid round platform (24) can enter the locking gap (36), and the side wall of the trapezoid round platform (24) can tightly abut against the two locking rods (32).
3. The locking structure of the multi-rotary valve electric actuator according to claim 2, wherein: every locking lever (32) middle part all is equipped with pin joint (33), is equipped with a spring (35) between two locking levers (32), the both ends of spring (35) support respectively in between pin joint (33) and the locking lamella (311) of two locking levers (32).
4. A multi-rotary-valve electric actuator locking arrangement as claimed in claim 3, wherein: two locking lever (32) are all extended a spacing nail relatively, the both ends of spring (35) cup joint respectively on two fibre nails (34).
5. The locking structure of the multi-rotary valve electric actuator according to claim 1, wherein: the clutch unit (2) further comprises a clutch rod (25), one end of the clutch rod (25) is fixedly connected with the clutch gear (21) in a coaxial mode, the locking circular truncated cone is fixedly connected with the other end of the clutch rod (25), and the clutch rod (25) can reciprocate along the length direction.
6. The locking structure of the multi-rotary valve electric actuator according to claim 5, wherein: the clutch unit (2) further comprises a U-shaped frame (23) and a clutch rod sleeve (26), two end portions of one side of an opening of the U-shaped frame (23) are provided with long round holes (231), the middle of the clutch rod sleeve (26) is hinged to the U-shaped frame (23) at the long round holes (231), one end of the clutch rod sleeve (26) is in contact with the trapezoid round table (24), and the other end of the clutch rod sleeve is in contact with the clutch gear (21).
7. The locking structure of the multi-rotary valve electric actuator according to claim 6, wherein: one closed side of the U-shaped frame (23) is connected with a handle (22).
8. The locking structure of the multi-rotary valve electric actuator according to claim 1, wherein: the manual gear (4) is coaxially connected with a hand wheel (41).
9. The locking structure of the multi-rotary valve electric actuator according to claim 1, wherein: the connecting rod (1) further comprises a threaded section (12), and the locking ring (31) can hold the connecting rod (1) tightly in the threaded section (12).
10. The locking structure of the multi-rotary valve electric actuator according to claim 2, wherein: and an anti-slip strip (37) is fixedly arranged on the inner side of the locking flap (311).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810984870.5A CN110864153B (en) | 2018-08-28 | 2018-08-28 | Locking structure of electric actuator of multi-rotary valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810984870.5A CN110864153B (en) | 2018-08-28 | 2018-08-28 | Locking structure of electric actuator of multi-rotary valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110864153A true CN110864153A (en) | 2020-03-06 |
| CN110864153B CN110864153B (en) | 2023-09-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810984870.5A Active CN110864153B (en) | 2018-08-28 | 2018-08-28 | Locking structure of electric actuator of multi-rotary valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110864153B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112503151A (en) * | 2020-12-14 | 2021-03-16 | 裕克施乐塑料制品（太仓）有限公司 | Torque induction protection mechanical bidirectional clutch manual-automatic integrated rotary actuator |
| CN113251158A (en) * | 2021-05-20 | 2021-08-13 | 安徽中捷自控设备有限公司 | But intelligent electric actuator of switch after outage |
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| JPS6018679A (en) * | 1983-07-10 | 1985-01-30 | Toda Kiko:Kk | Manually-operable electrically-driven rotating unit |
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| CN201258999Y (en) * | 2008-08-01 | 2009-06-17 | 常州电站辅机总厂有限公司 | Adjustment straight-stroke valve actuator |
| CN202901112U (en) * | 2012-09-18 | 2013-04-24 | 中国石油天然气股份有限公司 | Electric push rod or electric cylinder brake device of oil pumping machine |
| CN105134986A (en) * | 2015-09-09 | 2015-12-09 | 江苏英瑞环保科技有限公司 | High-temperature flashboard valve |
| CN205956525U (en) * | 2016-04-28 | 2017-02-15 | 嘉善贯德精密锻造有限公司 | Formula of moving away to avoid possible earthquakes valve gear mechanism |
| CN107269910A (en) * | 2017-07-14 | 2017-10-20 | 北京丰茂植保机械有限公司 | Equipment for plant protection double-control valve |
| CN209604641U (en) * | 2018-08-28 | 2019-11-08 | 天津市北方阀门控制设备有限公司 | A kind of more turning valve Electric Actuator manual mode locking mechanisms |
-
2018
- 2018-08-28 CN CN201810984870.5A patent/CN110864153B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1155950B (en) * | 1962-08-24 | 1963-10-17 | Ernst Wichmann | Electric motor drive for valves, slides or the like. |
| JPS6018679A (en) * | 1983-07-10 | 1985-01-30 | Toda Kiko:Kk | Manually-operable electrically-driven rotating unit |
| CN2776674Y (en) * | 2005-03-01 | 2006-05-03 | 张金龙 | Teeth clamping type emergency braking device |
| CN201096218Y (en) * | 2007-10-04 | 2008-08-06 | 林明祥 | Valve electric activator |
| CN201258999Y (en) * | 2008-08-01 | 2009-06-17 | 常州电站辅机总厂有限公司 | Adjustment straight-stroke valve actuator |
| CN202901112U (en) * | 2012-09-18 | 2013-04-24 | 中国石油天然气股份有限公司 | Electric push rod or electric cylinder brake device of oil pumping machine |
| CN105134986A (en) * | 2015-09-09 | 2015-12-09 | 江苏英瑞环保科技有限公司 | High-temperature flashboard valve |
| CN205956525U (en) * | 2016-04-28 | 2017-02-15 | 嘉善贯德精密锻造有限公司 | Formula of moving away to avoid possible earthquakes valve gear mechanism |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112503151A (en) * | 2020-12-14 | 2021-03-16 | 裕克施乐塑料制品（太仓）有限公司 | Torque induction protection mechanical bidirectional clutch manual-automatic integrated rotary actuator |
| CN112503151B (en) * | 2020-12-14 | 2024-01-05 | 裕克施乐塑料制品（太仓）有限公司 | Mechanical bidirectional clutch manual-automatic rotary actuator with torque induction protection function |
| CN113251158A (en) * | 2021-05-20 | 2021-08-13 | 安徽中捷自控设备有限公司 | But intelligent electric actuator of switch after outage |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110864153B (en) | 2023-09-19 |
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