CN116068221A - Can waterproof airspeed measuring device - Google Patents
Can waterproof airspeed measuring device Download PDFInfo
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- CN116068221A CN116068221A CN202310201898.8A CN202310201898A CN116068221A CN 116068221 A CN116068221 A CN 116068221A CN 202310201898 A CN202310201898 A CN 202310201898A CN 116068221 A CN116068221 A CN 116068221A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/14—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention relates to the technical field of airspeed measurement devices, and discloses a waterproof airspeed measurement device which comprises a main pipe body, a side pipe body, a first air pressure sensor, a telescopic mechanism and a sealing element. The main pipe body is provided with an air inlet channel and a sealing adjusting channel, and the side pipe body is provided with a pressure measuring channel; and a cross communication port is formed among the pressure measuring channel, the air inlet channel and the sealing adjusting channel. The first air pressure sensor is arranged in the pressure measuring channel and is used for measuring air dynamic pressure. The telescopic mechanism is provided with a telescopic rod, the telescopic rod is provided with a free end, and the sealing element is arranged at the free end of the telescopic rod; the telescopic mechanism is configured to drive the telescopic rod to drive the sealing element to reciprocate in the air inlet channel and the sealing adjusting channel, so that a passage between the air inlet channel and the pressure measuring channel is closed or opened. The airspeed measuring device has the advantages of simple structure, low power consumption, good reliability and high durability, and has little change on the body of the water-air submarine.
Description
Technical Field
The present invention relates generally to the field of airspeed measurement devices, and more particularly, to a waterproof airspeed measurement device.
Background
The air craft may participate in operations in a variety of mediums, such as in the air or in the water. Air-water craft often have airspeed tubes for measuring airspeed during operation in the air. However, in underwater operation, the conventional airspeed tube cannot be directly applied to an air-water craft because the conventional airspeed tube does not have a waterproof function.
Disclosure of Invention
In order to solve the technical problems, the invention provides a waterproof airspeed measurement device.
A waterproof airspeed measurement device comprises a main pipe body, a side pipe body, a first air pressure sensor, a telescopic mechanism and a sealing element. The main pipe body is provided with an air inlet channel and a sealing adjusting channel, and the side pipe body is provided with a pressure measuring channel; and a cross communication port is formed among the pressure measuring channel, the air inlet channel and the sealing adjusting channel. The first air pressure sensor is arranged in the pressure measuring channel and is used for measuring air dynamic pressure. The telescopic mechanism is provided with a telescopic rod, the telescopic rod is provided with a free end, and the sealing element is arranged at the free end of the telescopic rod; the telescopic mechanism is configured to drive the telescopic rod to drive the sealing element to reciprocate in the air inlet channel and the sealing adjusting channel, so that a passage between the air inlet channel and the pressure measuring channel is closed or opened.
Preferably, the air intake passage has an air intake port, and the seal member is located at the air intake port when the passage between the air intake passage and the pressure measurement passage is closed.
Preferably, the intake passage and the seal adjustment passage are configured as linear passages, and the telescopic mechanism is a linear telescopic mechanism.
Specifically, the first air pressure sensor is disposed at an end of the side tube body remote from the main tube body. Further, a first sealing ring is arranged between the side pipe body and the first air pressure sensor.
Preferably, the pressure measuring channels are configured as straight channels, and are distributed at an angle to the air inlet channels, wherein the included angle is 135-150 degrees.
Preferably, the linear telescopic mechanism further comprises a fixed connecting piece, wherein the fixed connecting piece is configured into a tubular body, one end of the tubular body is connected with the main pipe body, and the other end of the tubular body is connected with the linear telescopic mechanism. Further, one end of the main pipe body, which defines a seal adjusting channel, is provided with a second sealing ring, and the telescopic rod penetrates through the second sealing ring to enter the seal adjusting channel.
Optionally, a static pressure port is arranged on the side wall of the side pipe body, and a second air pressure sensor is arranged at the static pressure port and used for measuring air flow static pressure.
Preferably, the main pipe body and the side pipe body are made of metal and are integrally formed.
Preferably, the airspeed measurement device is provided with a limiting part, and when the limiting part limits the telescopic rod to drive the sealing element to move, the sealing element is positioned at the air inlet of the air inlet channel.
The invention has the characteristics and advantages that:
the waterproof airspeed measuring device provided by the invention realizes the switching of the airspeed measuring device between the opening state and the closing state through the movable sealing element and the telescopic mechanism, and has lower power consumption and good waterproof effect. The airspeed measuring device has the advantages of simple structure, good reliability and high durability, and has less change on the body of the water-air submarine, thereby meeting the structural requirements.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a waterproof airspeed measurement device provided by the present invention;
FIG. 2 is a schematic cross-sectional view of the tube of the airspeed measurement device;
FIG. 3 is a schematic illustration of the airspeed measurement device in a closed state;
fig. 4 is a schematic view of the airspeed measurement device in an open state.
In the drawings, the reference numerals and corresponding part names:
100-space velocity a measuring device; 10-a tube body; 12-main pipe body; 13 a-an intake passage; 13 b-sealing the conditioning channel; 14-air inlet; 15-a first opening; 16-side tube body; 17-pressure measuring channel; 18-a second opening; 19-static pressure port; 137-intersection communication port; 13a 1-terminal position; 20-a telescopic mechanism; 22-telescopic rod; 222-free end; 222 a-an annular groove; 24-a body; 25-limiting bosses; 101-a first air pressure sensor; 102-a seal; 103-a first sealing ring; 104-a second sealing ring; 105-a second barometric sensor; 30-fixing the bracket.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present invention provides a waterproof airspeed measurement device 100 having a closed state and an open state that is applicable to an air-water craft. When the air-water craft is operating under water, the airspeed measurement device 100 is in a closed state, preventing water from entering the interior of the airspeed measurement device 100 (e.g., the pressure channel 17), preventing damage to its components; when the water-air craft is operating in the air, airspeed measurement device 100 is in an open state and can be used to measure airspeed. The waterproof airspeed measurement device 100 may be mounted to the nose or wing of a water-air craft.
Referring to fig. 1, 2 and 3, airspeed measurement device 100 includes a tube 10, a first air pressure sensor 101, a seal 102, and a telescoping mechanism 20. The tubular body 10 includes a main tubular body 12 and a side tubular body 16. The main pipe body 12 has an intake passage 13a and a seal adjustment passage 13b, and the side pipe body 16 has a pressure measurement passage 17. The pressure measuring passage 17, the intake passage 13a, and the seal regulating passage 13b form a cross communication port 137 therebetween. The first air pressure sensor 101 is disposed on the side pipe body 16 or the pressure measuring channel 17 for measuring dynamic pressure of air flow. The seal 102 is movably provided in the air intake passage 13a and the seal-regulating passage 13b of the main tube body 12. The telescoping mechanism 20 has a telescoping rod 22 with a seal 102 disposed at a free end 222 of the telescoping rod 22. Telescoping mechanism 20 may drive telescoping rod 22 to reciprocate within main body 12, which in turn drives seal 102 to reciprocate between intake passageway 13a and seal adjustment passageway 13b, thereby opening or closing the passageway between intake passageway 13a and pressure measurement passageway 17. When the seal 102 is located in the seal regulating passage 13b, the passage between the intake passage 13a and the pressure measuring passage 17 is opened, and the intake passage 13a communicates with the pressure measuring passage 17 through the cross communication port 137; when the seal 102 is located in the intake passage 13a, the passage between the intake passage 13a and the pressure measurement passage 17 is closed, and the seal adjustment passage 13b communicates with the pressure measurement passage 17 through the intersection 137. The airspeed measurement device 100 is switched between an open state and a closed state by the movable seal 102 and the telescoping mechanism 20, and has low power consumption and good waterproof effect. The airspeed measurement device 100 has simple structure, good reliability and high durability, and has small change to the body of the water-air submarine, thereby meeting the structural requirements.
Alternatively, the reciprocating motion of telescoping rod 22 within main tubular body 12 may be an arcuate reciprocating motion or a linear reciprocating motion. For example, in some embodiments, telescoping mechanism 20 drives telescoping rod 22 in an arcuate motion such that seal 102 reciprocates in an arcuate motion in intake passage 13a and seal adjustment passage 13b. The telescopic mechanism 20 includes a connecting rod, a telescopic rod and a rotating shaft, one end of the connecting rod is connected with the rotating shaft, and the other end of the connecting rod is connected with the telescopic rod 22. The telescopic mechanism 20 drives the connecting rod to rotate clockwise and anticlockwise, and the connecting rod drives the telescopic rod 22 to reciprocate in an arc. In other embodiments, as shown in fig. 3 and 4, the telescopic mechanism 20 drives the telescopic rod 22 to perform linear reciprocation, so that the sealing member 102 performs linear reciprocation in the intake passage 13a and the seal adjustment passage 13b.
Specifically, in some embodiments, the tube 10 includes a main tube 12 and a side tube 16 in cavity communication, the main tube 12 defining an intake passage 13a and a seal adjustment passage 13b, the side tube 16 defining a pressure measurement passage 17, and one end of the side tube 16 being connected to the main tube 12. The shapes of the intake passage 13a and the seal-regulating passage 13b may be configured to match the movement pattern of the telescopic rod 22. For example, when the telescopic rod 22 reciprocates in an arc, the air intake passage 13a and the seal regulating passage 13b are configured as arc-shaped passages; the intake passage 13a and the seal adjustment passage 13b are configured as straight passages when the telescopic rod 22 is linearly reciprocated. The intake passage 13a and the seal regulating passage 13b are constructed as straight passages, which facilitate processing and can reduce total pressure loss.
Referring to fig. 2 and 3, in some embodiments, main tubular body 12 and side tubular bodies 16 are configured as tubular bodies having a circular cross-section, fixedly attached by bonding, welding, or the like, or integrally formed therewith. Specifically, the tube body 10 is integrally formed of a metal material, such as an aluminum alloy. The air intake passage 13a and the seal adjustment passage 13b of the main tube body 12 are configured as straight passages, the air intake passage 13a forming an air intake 14 at one end of the main tube body 12, and the seal adjustment passage 13b forming a first opening 15 at the other end of the main tube body 12. Wherein an external medium (e.g., air) may enter the air inlet channel 13a from the air inlet 14, and the telescopic rod 22 of the telescopic mechanism 20 extends through the first opening 15 into the seal-adjusting channel 13b. The pressure measuring channel 17 of the side pipe body 16 is constructed as a straight channel, the pressure measuring channel 17 and the air inlet channel 13a are distributed at an angle to form an included angle alpha, and the included angle alpha can be a right angle or an obtuse angle; preferably, the degree of the included angle alpha is 135-150 degrees, so that the total pressure loss is reduced, and the telescopic rod 22 is convenient to move. One end of the pressure measuring channel 17 is connected to the cross communication port 137, and the other end forms the second opening 18 in the side pipe body 16.
The seal member 102 may be constructed in any shape as long as it is sufficient that the seal member 102 prevents water from entering the pressure measuring channel 17 when it is located in the intake channel 13a. In some embodiments, the seal 102 is configured as a solid cylindrical gasket that is connected to the free end 222 of the telescoping rod 22. In other embodiments, referring to fig. 3, the seal 102 is configured as a sealing ring disposed on the free end 222 of the telescoping rod 22. Specifically, the free end 222 is provided with an annular groove 222a, and the seal ring is fixed in the annular groove 222 a. In order to ensure the sealing effect, in particular, a plurality of annular grooves 222a, for example 2 to 4 annular grooves 222a, are provided on the free end 222, and a sealing ring is provided in each annular groove 222 a.
With continued reference to fig. 2 and 3, a first air pressure sensor 101 is disposed at an end of the side tube 16 remote from the main tube 12. In some embodiments, the first air pressure sensor 101 is disposed at the second opening 18 of the side tube 16 and is fixedly connected to the side tube 16. Optionally, airspeed measurement device 100 includes a first seal 103, first seal 103 being disposed between side tube 16 and first air pressure sensor 101. The first sealing ring 103 is filled between the first air pressure sensor 101 and the side pipe body 16, so that water can be prevented from penetrating into the pressure measuring channel 17 from the connecting gap.
In some embodiments, airspeed measurement device 100 includes a cable and a data module that is connected by the cable between first air pressure sensor 101 and the data module that is also connected by the cable to the flight control system of the water-air craft. The data measured by the first air pressure sensor 101 are transmitted to a data module through a cable, and the data module analyzes the data and then transmits an airspeed result obtained through analysis to the flight control system through the cable.
In some embodiments, the side walls of the side tube 16 of the airspeed measurement device 100 are also provided with static ports 19. Airspeed measurement device 100 also includes a second barometric pressure sensor 105 for measuring the static pressure of the airflow, second barometric pressure sensor 105 being disposed at static pressure port 19. The second air pressure sensor 105 is connected with the data module through a cable, and the data module is also connected to the flight control system of the air-water craft through a cable. The data measured by the second air pressure sensor 105 is transmitted to the data module through the cable, and the data module analyzes the data and then retransmits the airspeed result obtained by analysis to the flight control system through the cable.
In some embodiments, the telescopic mechanism 20 is a linear telescopic mechanism, such as a telescopic hydraulic cylinder, a telescopic pneumatic cylinder, an electric push rod, a linear steering engine, a linear motor, and the like, which can realize linear reciprocating motion. The linear expansion mechanism has a main body 24 and an expansion link 22, wherein the main body 24 is disposed outside the pipe body 10 and near one end of the first opening 15. One end of the telescopic rod 22 is coupled to the main body 24, and the other end extends through the first opening 15 into the seal adjustment passage 13b and is fixedly connected to the seal 102. The telescopic rod 22 is arranged parallel, preferably coaxially, to the seal adjustment channel 13b. When the telescopic rod 22 drives the sealing member 102 to move to the end position 13a1 abutting against the air inlet channel 13a or any position in the air inlet channel 13a, referring to fig. 3, the sealing member 102 closes the passage from the air inlet 14 to the pressure measuring channel 17, the sealing member 102 prevents the medium outside the airspeed measuring device 100 from entering the pressure measuring channel 17, and the airspeed measuring device 100 is in a closed state. The extension rod 22 is driven to move in a direction approaching the main body 24 (i.e., the extension rod 22 is retracted) until the sealing member 102 is moved to the end position 13a1 out of the air inlet channel 13a or any position within the seal adjustment channel 13b, see fig. 4, the passage from the air inlet 14 to the pressure measurement channel 17 is restored, the external medium can enter the pressure measurement channel 17 through the air inlet 14, and the airspeed measurement device 100 is in an open state. When it is desired to close the passageway from the air inlet 14 to the pressure measurement channel 17, the extension rod 22 is driven to move away from the main body 24 (i.e., extend the extension rod 22) until the seal 102 moves to the end position 13a1 abutting the air inlet channel 13a or any position within the air inlet channel 13a, and the airspeed measurement device 100 enters a closed state.
In some preferred embodiments, the linear telescoping mechanism may drive the telescoping rod 22 to move the seal 102 to the air intake 14. When it is necessary to close the passage between the intake passage 13a and the pressure measurement passage 17, the seal 102 is located at the intake port 14 of the intake passage 13a. When airspeed measurement device 100 is positioned underwater, seal 102 is positioned at air inlet 14 of air intake passage 13a, and seal 102 may effectively block water from flowing into air intake passage 13a. When the air space measuring device 100 is in the open state, since there is no water in the intake passage 13a, the hidden trouble of water entering the pressure measuring passage 17 is eliminated.
Alternatively, when it is necessary to close the passage between the intake passage 13a and the pressure measurement passage 17, the seal member 102 may be located at any position between the intake port 14 of the intake passage 13a and the end position 13a 1. In order to avoid water from entering the pressure measuring channel 17, before the passage between the air inlet channel 13a and the pressure measuring channel 17 is opened, the telescopic rod 22 is driven by the telescopic mechanism 20 to drive the sealing element 102 to move to the air inlet 14, after the water possibly remained in the air inlet channel 13a is completely removed, the sealing element 102 is driven by the telescopic rod 22 to move towards the direction of the sealing adjusting channel 13b so as to open the passage between the air inlet channel 13a and the pressure measuring channel 17.
In some embodiments, airspeed measurement device 100 is further provided with a stop that limits movement of seal 102 by telescoping rod 22, seal 102 being positioned at air inlet 14 of air inlet passageway 13a. Alternatively, a stop may be provided on the main tubular body 12, for example, the stop may be a collar/bump provided at the air inlet 14. When it is desired to close the passageway between the inlet channel 13a and the pressure measurement channel 17, the telescopic rod 22 drives the seal 102 to move towards the inlet 14 until the seal 102 abuts the collar/bump to ensure that the seal 102 moves into place. Alternatively, a limiting portion is provided on the telescopic mechanism 20, for example, referring to fig. 3, the limiting portion is a limiting boss 25 provided on the telescopic rod 22. When the limit boss 25 abuts the end of the first opening 15 of the main tubular body 12, the seal 102 is located at the air inlet 14 to ensure that the seal 102 moves into place.
In some embodiments, to prevent water from entering the seal adjustment channel 13b from the gap between the telescoping rod 22 and the first opening 15, the end of the main tube body 12 defining the seal adjustment channel 13b is provided with a second sealing ring 104. Preferably, the second sealing ring 104 is disposed at the first opening 15.
In some embodiments, airspeed measurement device 100 also includes a fixed connection 30 for connecting tube body 10 and telescoping mechanism 20. With continued reference to fig. 1 and 3, the fixed connection 30 is configured in a tubular shape, one end of the fixed connection 30 being adapted to receive one end of the main tubular body 12 at the first opening 15, and the other end of the fixed connection 30 being adapted to receive the main body 24 of the linear telescoping mechanism on the side of the main tubular body 12. In some embodiments, the fixed connector 30 may be detachably connected to the pipe body 10 and the telescopic mechanism 20 through bolt holes or the like. For example, holes are provided in the side walls of both ends of the fixed connector 30, screw holes are provided in the corresponding parts of the pipe body 10 and the telescopic mechanism 20, and the fixed connector is fixed by bolts. In other embodiments, the fixing connection member 30 may be directly and fixedly connected to the pipe body 10 and the telescopic mechanism 20 by welding or the like. For example, the fixing connector 30 is directly welded to the pipe body 10 and the telescopic mechanism 20 at both ends thereof.
The waterproof airspeed measurement device 100 provided by the invention comprises a tube body 10, a first air pressure sensor 101 and a sealing element 102. The pipe body 10 has an air intake passage 13a, a seal regulating passage 13b, and a pressure measuring passage 17 communicating with each other, a first air pressure sensor 101 for measuring air dynamic pressure is provided to the pressure measuring passage 17, and a seal 102 is movably provided to the air intake passage 13a and the seal regulating passage 13b. When seal 102 is at least partially positioned in air intake passage 13a, airspeed measurement device 100 is in a closed state, preventing external medium (e.g., water) from entering pressure measurement passage 17; when the seal 102 is disengaged from the inlet passage 13a, the airspeed measurement device 100 is in an open state, allowing external medium (e.g., air) to enter the pressure measurement passage 17. The airspeed measurement device 100 can be switched between an open state and a closed state by the movable seal 102, and has low power consumption and good waterproof effect.
The foregoing is merely a few embodiments of the present invention and those skilled in the art may make various modifications or alterations to the embodiments of the present invention without departing from the spirit and scope of the invention in light of the present invention.
Claims (10)
1. A waterproof airspeed measurement device, comprising:
a main pipe body having an intake passage and a seal adjustment passage;
the side pipe body is provided with a pressure measuring channel, and a cross communication port is formed among the pressure measuring channel, the air inlet channel and the sealing adjusting channel;
the first air pressure sensor is arranged in the pressure measuring channel and is used for measuring air flow dynamic pressure; and
the telescopic mechanism is provided with a telescopic rod, the telescopic rod is provided with a free end, and the sealing piece is arranged at the free end of the telescopic rod; the telescopic mechanism is configured to drive the telescopic rod to drive the sealing piece to reciprocate in the air inlet channel and the sealing adjusting channel, so that a passage between the air inlet channel and the pressure measuring channel is closed or opened.
2. The waterproof airspeed measurement device of claim 1, wherein the air intake channel has an air inlet, the seal being located at the air inlet when the passageway between the air intake channel and the pressure measurement channel is closed.
3. The waterproof airspeed measurement device of claim 2, wherein the air intake passage and the seal-adjustment passage are configured as a linear passage, and the telescoping mechanism is a linear telescoping mechanism.
4. A watertight airspeed measurement device as claimed in claim 3, wherein the first air pressure sensor is provided at an end of the side tube remote from the main tube.
5. The waterproof airspeed measurement device of claim 4, wherein a first seal is disposed between the side tube and the first air pressure sensor.
6. The watertight airspeed measurement device of claim 5, wherein the pressure measurement channel is configured as a straight channel, the pressure measurement channel being angularly spaced from the air inlet channel by an angle of 135 ° to 150 °.
7. The waterproof airspeed measurement device of claim 6, further comprising a fixed connector configured as a tubular body having one end connected to the main tube and the other end connected to the linear telescoping mechanism; and a second sealing ring is arranged at one end of the main pipe body, which is used for limiting the sealing adjusting channel, and the telescopic rod penetrates through the second sealing ring to enter the sealing adjusting channel.
8. The waterproof airspeed measurement device of claim 7, wherein the side wall of the side tube is provided with a static pressure port at which is provided a second air pressure sensor for measuring the static pressure of the air flow.
9. The waterproof airspeed measurement device according to any one of claims 1 to 8, wherein the main tube body and the side tube body are made of metal and are integrally formed.
10. The waterproof airspeed measurement device according to any one of claims 1 to 8, wherein the airspeed measurement device has a stopper portion; when the limiting part limits the telescopic rod to drive the sealing element to move, the sealing element is positioned at the air inlet of the air inlet channel.
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| CN202310201898.8A CN116068221B (en) | 2023-03-06 | 2023-03-06 | Can waterproof airspeed measuring device |
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| CN202310201898.8A CN116068221B (en) | 2023-03-06 | 2023-03-06 | Can waterproof airspeed measuring device |
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| CN114113672A (en) * | 2022-01-21 | 2022-03-01 | 中国空气动力研究与发展中心空天技术研究所 | Head cover sealed waterproof airspeed head |
Non-Patent Citations (1)
| Title |
|---|
| 邓子香: "YY—2型风速仪校正器研制报告", 《南方冶金学院学报》, pages 43 - 64 * |
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| CN116068221B (en) | 2023-06-06 |
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