CN112525341B - High-purple-glass protection mechanism for flame detector of automatic burner - Google Patents
High-purple-glass protection mechanism for flame detector of automatic burner Download PDFInfo
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- CN112525341B CN112525341B CN201910794535.3A CN201910794535A CN112525341B CN 112525341 B CN112525341 B CN 112525341B CN 201910794535 A CN201910794535 A CN 201910794535A CN 112525341 B CN112525341 B CN 112525341B
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- 239000011521 glass Substances 0.000 title claims abstract description 28
- 230000007246 mechanism Effects 0.000 title claims abstract description 25
- 238000009413 insulation Methods 0.000 claims description 11
- 230000001681 protective effect Effects 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 11
- 238000002834 transmittance Methods 0.000 abstract description 4
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 230000017525 heat dissipation Effects 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J2001/0276—Protection
Abstract
The invention relates to the technical field of flame detectors and discloses a high-transmittance purple glass protection mechanism for a flame detector of an automatic burner. This flame detector of automatic combustion ware is with high purple glass protection machanism that passes through the preliminary increase flame detector body of sleeve pipe and the distance of heat source to reduce the influence of high temperature to the flame detector body, the area of contact of rethread fin increase sleeve pipe and air further accelerates the radiating speed of sleeve pipe, reaches the effect of preliminary heat dissipation protection.
Description
Technical Field
The invention relates to the technical field of flame detectors, in particular to a high-transmittance purple glass protection mechanism for a flame detector of an automatic burner.
Background
The flame detector is used for detecting visible or invisible light radiation which is not in the atmosphere while generating smoke and emitting heat when substances are combusted, and is also called a photosensitive fire detector.
The experimental device for the ultraviolet flame detector disclosed in the Chinese patent publication No. CN107702795A has a simple flame detection function, but has no high-temperature protection function, and cannot be used in a high-temperature automatic burner, and although some ultraviolet flame detectors can be used through air cooling, the experimental device has short service life, large power consumption of air cooling equipment, high production cost and the like, so that the high-transparency purple glass protection mechanism for the flame detector of the automatic burner is provided for solving the problems.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a high-transmittance purple glass protection mechanism for a flame detector of an automatic combustor, which has the advantages of high-temperature protection and the like, and solves the problems that the high-temperature protection mechanism cannot be used in the high-temperature automatic combustor, and the ultraviolet flame detector partially through air cooling can be used, but the high-temperature protection mechanism has short service life, large power consumption of air cooling equipment, high production cost and the like.
(II) technical scheme
In order to realize the purpose of high-temperature protection, the invention provides the following technical scheme: the utility model provides a flame detector of automatic combustor is with high purple glass protection machanism that passes through, includes the sleeve pipe, sheathed tube left side fixed mounting has the connecting pipe, sheathed tube outer wall has cup jointed the fin, sheathed tube inner wall and the right side fixed mounting that lies in the fin have thermal-insulated pipe, the inner wall top and the bottom of thermal-insulated pipe have all been seted up the spacing groove, the inside movable mounting of spacing groove has the stopper, the opposite side fixed mounting of stopper has the core pipe, the back of the body side of stopper has all seted up the locating hole, the inner wall fixed mounting of core pipe has the spacing collar, the inside movable mounting of spacing collar has the flame detector body, the right side movable mounting of core pipe has the protective cover, the right side fixed mounting of protective cover has the turning handle, the sheathed tube top just lies in the top of locating hole and has seted up the through-hole, the sheathed tube outer wall just lies in the periphery of through-hole and has cup jointed solid fixed ring, the utility model discloses a positioning pin, including solid fixed ring, fixed ring's top movable mounting has the locating pin that runs through and extend to the locating hole inside, first spacing ring has been cup jointed to the outer wall of locating pin and is located solid fixed ring's inside, the bottom fixed mounting of first spacing ring has the first reset spring that extends to solid fixed ring inner wall, gu fixed ring's outer wall has just been located the left side of locating pin and has been seted up the draw-in groove, gu fixed ring's outer wall has been cup jointed the loose ring, the top fixed mounting that the inner wall top of loose ring just is located the draw-in groove has second reset spring, second reset spring's bottom fixed mounting has the kelly that extends to the inside of draw-in groove, the inner wall of loose ring just is located the top of locating pin and is seted up flutedly.
Preferably, the diameter of the sleeve is five centimeters, the sleeve is a copper pipe, and the outer wall of the connecting pipe is provided with an installation groove.
Preferably, the radiating fin is an annular wavy aluminum sheet, radiating holes are formed in the outer wall of the radiating fin, and the radiating holes are distributed on the radiating fin in a circular array by taking the axial lead of the sleeve as an axis.
Preferably, the heat insulation pipe is a high-temperature-resistant rubber pipe, the core pipe is a high-permeability purple glass pipe, and the diameter of the core pipe is three points and six centimeters.
Preferably, the number of the limiting rings is two, the cross section of each limiting ring is D-shaped, and each limiting ring is an organic silicon rubber heat insulation ring.
Preferably, the inner wall of the core tube is provided with a first thread groove, and the outer wall of the protective cover is provided with a second thread groove corresponding to the first thread groove.
Preferably, the outer walls of the rotating handle and the movable ring are provided with anti-slip grooves, and the inner wall of the movable ring is meshed with the outer wall of the fixed ring.
Preferably, the number of the clamping grooves is sixty, and the sixty clamping grooves are distributed on the outer wall of the fixing ring in an annular array.
Preferably, the length of the positioning pin is greater than the shortest distance between the positioning hole and the groove, and the groove is a wavy arc groove.
(III) advantageous effects
Compared with the prior art, the invention provides a high-purple-glass protection mechanism for a flame detector of an automatic burner, which has the following beneficial effects:
1. this flame detector of automatic combustion ware is with high purple glass protection machanism that passes through, install this protection machanism on the automatic combustion ware through the mounting groove on the connecting pipe, through the preliminary increase flame detector body of sleeve pipe and the distance of heat source, thereby reduce the influence of high temperature to the flame detector body, the area of contact of rethread fin increase sleeve pipe and air, further accelerate the radiating speed of sleeve pipe, reach the effect of preliminary heat dissipation protection, and simultaneously, through the thermal-insulated pipe, core pipe and spacing collar carry out the separation to the high temperature on the sleeve pipe and the inside high temperature of sleeve pipe, reach the effect of multiple high-efficient protection, avoid the flame detector body to cause the condition emergence of damage because of working under the high temperature state for a long time, thereby the life of flame detector body has been prolonged, further improvement this protection machanism's practicality.
2. This flame detector of auto-combustor is with high purple glass protection machanism that passes the core pipe through the ultraviolet ray that the inside heat of auto-combustor carried to detect through the flame detector body, through the influence of core pipe separation high temperature to the flame detector body, reach simple and convenient thermal-insulated effect simultaneously, compare with traditional forced air cooling, this protection machanism structure is simpler, and life is longer, has reduced manufacturing cost simultaneously, makes this protection machanism facilitate promotion.
Drawings
FIG. 1 is a schematic structural view of a high-permeability purple glass protection mechanism for a flame detector of an automatic burner, according to the present invention;
FIG. 2 is an enlarged view of the portion A in FIG. 1 of a high transparent purple glass protection mechanism for a flame detector of an automatic burner according to the present invention;
FIG. 3 is a left sectional view of a movable ring of a high-transmittance purple glass protection mechanism structure for a flame detector of an automatic burner according to the present invention.
In the figure: the flame detector comprises a sleeve pipe 1, a connecting pipe 2, a radiating fin 3, a heat insulation pipe 4, a limiting groove 5, a limiting block 6, a core pipe 7, a positioning hole 8, a limiting ring 9, a flame detector body 10, a protective cover 11, a rotating handle 12, a through hole 13, a fixing ring 14, a positioning pin 15, a first limiting ring 16, a first return spring 17, a clamping groove 18, a movable ring 19, a second return spring 20, a clamping rod 21 and a groove 22.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, a high transparent purple glass protection mechanism for a flame detector of an automatic burner comprises a sleeve 1, a connecting pipe 2 is fixedly installed on the left side of the sleeve 1, the diameter of the sleeve 1 is five centimeters, the sleeve 1 is a copper pipe, an installation groove is formed in the outer wall of the connecting pipe 2, a radiating fin 3 is sleeved on the outer wall of the sleeve 1, the radiating fin 3 is an annular wavy aluminum sheet, radiating holes are formed in the outer wall of the radiating fin 3, the radiating holes are distributed on the radiating fin 3 in a circular array by taking the axial lead of the sleeve 1 as an axis, a heat insulation pipe 4 is fixedly installed on the inner wall of the sleeve 1 and positioned on the right side of the radiating fin 3, limiting grooves 5 are formed in the top and the bottom of the inner wall of the heat insulation pipe 4, a limiting block 6 is movably installed inside the limiting block 5, a core pipe 7 is fixedly installed on the opposite side of the limiting block 6, the heat insulation pipe 4 is a high temperature resistant rubber pipe, and the core pipe 7 is a high transparent purple glass pipe, the diameter of the core tube 7 is three points and six centimeters, positioning holes 8 are formed in the opposite sides of the limiting blocks 6, two limiting rings 9 are fixedly arranged on the inner wall of the core tube 7, the cross section of each limiting ring 9 is D-shaped, each limiting ring 9 is an organic silicon rubber heat insulation ring, a flame detector body 10 is movably arranged in each limiting ring 9, a protective cover 11 is movably arranged on the right side of the core tube 7, a first thread groove is formed in the inner wall of the core tube 7, a second thread groove corresponding to the first thread groove is formed in the outer wall of each protective cover 11, a rotating handle 12 is fixedly arranged on the right side of each protective cover 11, a through hole 13 is formed in the top of the sleeve 1 and located above each positioning hole 8, a fixing ring 14 is sleeved on the outer wall of the sleeve 1 and located on the periphery of the through hole 13, a positioning pin 15 penetrating and extending into the positioning holes 8 is movably arranged at the top of the fixing ring 14, a first limiting ring 16 is sleeved on the outer wall of the positioning pin 15 and located inside the fixing ring 14, the bottom of the first limiting ring 16 is fixedly provided with a first reset spring 17 extending to the inner wall of the fixing ring 14, the outer wall of the fixing ring 14 and the left side of the positioning pin 15 are provided with clamping grooves 18, the number of the clamping grooves 18 is sixty, the sixty clamping grooves 18 are distributed on the outer wall of the fixing ring 14 in an annular array manner, the outer wall of the fixing ring 14 is sleeved with a movable ring 19, the outer walls of the rotating handle 12 and the movable ring 19 are both provided with anti-skidding grooves, the inner wall of the movable ring 19 is mutually meshed with the outer wall of the fixing ring 14, the top of the inner wall of the movable ring 19 is fixedly provided with a second reset spring 20 above the clamping grooves 18, the bottom of the second reset spring 20 is fixedly provided with a clamping rod 21 extending to the inside of the clamping groove 18, the inner wall of the movable ring 19 and the upper side of the positioning pin 15 are provided with a groove 22, the length of the positioning pin 15 is greater than the shortest distance between the positioning hole 8 and the groove 22, the groove 22 is a wave-shaped arc groove, the protection mechanism is arranged on the automatic burner through the mounting groove on the connecting pipe 2, the distance between the flame detector body 10 and a heat source is preliminarily increased through the sleeve 1, thereby reducing the influence of high temperature on the flame detector body 10, the contact area between the sleeve 1 and air is increased through the radiating fins 3, further accelerating the radiating speed of the sleeve 1, achieving the effect of preliminary radiating protection, simultaneously, the high temperature on the sleeve 1 and the high temperature inside the sleeve 1 are separated through the heat insulation pipe 4, the core pipe 7 and the limiting ring 9, achieving the effect of multiple high-efficiency protection, avoiding the damage of the flame detector body 10 caused by long-time work under the high temperature state, thereby prolonging the service life of the flame detector body 10, further improving the practicability of the protection mechanism, ultraviolet rays carried by the heat inside the automatic burner pass through the core pipe 7, and detect through flame detector body 10, simultaneously through core pipe 7 separation high temperature to flame detector body 10's influence, reach simple and convenient thermal-insulated effect, compare with traditional forced air cooling, this protection machanism structure is simpler, and life is longer, has reduced manufacturing cost simultaneously for this protection machanism facilitate promotion.
To sum up, the high transparent purple glass protection mechanism for the flame detector of the automatic burner is arranged on the automatic burner through the mounting groove on the connecting pipe 2, the distance between the flame detector body 10 and a heat source is preliminarily increased through the sleeve 1, so that the influence of high temperature on the flame detector body 10 is reduced, the contact area between the sleeve 1 and air is increased through the radiating fins 3, the radiating speed of the sleeve 1 is further increased, the preliminary radiating protection effect is achieved, meanwhile, the high temperature on the sleeve 1 and the high temperature inside the sleeve 1 are separated through the heat insulation pipe 4, the core pipe 7 and the limiting ring 9, the multiple high-efficiency protection effect is achieved, the damage of the flame detector body 10 caused by long-time working under the high temperature state is avoided, the service life of the flame detector body 10 is prolonged, and the practicability of the protection mechanism is further improved, ultraviolet ray carried through the inside heat of automatic burner passes core pipe 7, and detect through flame detector body 10, simultaneously through the influence of core pipe 7 separation high temperature to flame detector body 10, reach simple and convenient thermal-insulated effect, compare with traditional forced air cooling, this protection machanism structure is simpler, long service life is longer, manufacturing cost has been reduced simultaneously, make this protection machanism facilitate promotion, it does not have the high temperature safeguard function to have solved, can not be in the inside use of high temperature automatic burner, the part can use through air-cooled ultraviolet flame detector, but its life is short, the electric quantity is big for the air-cooled equipment, cause the problem that manufacturing cost is high etc.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides an automatic flame detector of combustor is with high purple glass protection machanism that passes through, includes sleeve pipe (1), its characterized in that: the left side fixed mounting of sleeve pipe (1) has connecting pipe (2), fin (3) have been cup jointed to the outer wall of sleeve pipe (1), the inner wall of sleeve pipe (1) and the right side fixed mounting that is located fin (3) have thermal-insulated pipe (4), spacing groove (5) have all been seted up to the inner wall top and the bottom of thermal-insulated pipe (4), the inside movable mounting of spacing groove (5) has stopper (6), the opposite side fixed mounting of stopper (6) has core pipe (7), locating hole (8) have all been seted up to the opposite side of stopper (6), the inner wall fixed mounting of core pipe (7) has spacing collar (9), the inside movable mounting of spacing collar (9) has flame detector body (10), the right side movable mounting of core pipe (7) has protective cover (11), the right side fixed mounting of protective cover (11) has turning handle (12), the top of the sleeve (1) is positioned above the positioning hole (8) and is provided with a through hole (13), the outer wall of the sleeve (1) is positioned at the periphery of the through hole (13) and is sleeved with a fixing ring (14), the top of the fixing ring (14) is movably provided with a positioning pin (15) penetrating through and extending into the positioning hole (8), the outer wall of the positioning pin (15) is positioned inside the fixing ring (14) and is sleeved with a first limiting ring (16), the bottom of the first limiting ring (16) is fixedly provided with a first reset spring (17) extending to the inner wall of the fixing ring (14), the outer wall of the fixing ring (14) is positioned at the left side of the positioning pin (15) and is provided with a clamping groove (18), the outer wall of the fixing ring (14) is sleeved with a movable ring (19), the top of the inner wall of the movable ring (19) is fixedly provided with a second reset spring (20) positioned above the clamping groove (18), the bottom of the second reset spring (20) is fixedly provided with a clamping rod (21) extending to the inside of the clamping groove (18), and a groove (22) is formed in the inner wall of the movable ring (19) and above the positioning pin (15).
2. The high-permeability purple glass protection mechanism for the flame detector of the automatic burner, according to claim 1, is characterized in that: the diameter of the sleeve (1) is five centimeters, the sleeve (1) is a copper pipe, and the outer wall of the connecting pipe (2) is provided with an installation groove.
3. The high-permeability purple glass protection mechanism for the flame detector of the automatic burner, according to claim 1, is characterized in that: the radiating fin (3) is an annular wavy aluminum sheet, radiating holes are formed in the outer wall of the radiating fin (3), and the radiating holes are distributed on the radiating fin (3) in a circular array mode by taking the axial lead of the sleeve (1) as an axis.
4. The high-permeability purple glass protection mechanism for the flame detector of the automatic burner, according to claim 1, is characterized in that: the heat insulation pipe (4) is a high-temperature-resistant rubber pipe, the core pipe (7) is a high-permeability purple glass pipe, and the diameter of the core pipe (7) is three points and six centimeters.
5. The high-permeability purple glass protection mechanism for the flame detector of the automatic burner, according to claim 1, is characterized in that: the number of the limiting rings (9) is two, the cross section of each limiting ring (9) is D-shaped, and each limiting ring (9) is an organic silicon rubber heat insulation ring.
6. The high-permeability purple glass protection mechanism for the flame detector of the automatic burner, according to claim 1, is characterized in that: the inner wall of the core pipe (7) is provided with a first thread groove, and the outer wall of the protective cover (11) is provided with a second thread groove corresponding to the first thread groove.
7. The high-permeability purple glass protection mechanism for the flame detector of the automatic burner, according to claim 1, is characterized in that: the outer walls of the rotating handle (12) and the movable ring (19) are provided with anti-skidding grooves, and the inner wall of the movable ring (19) is meshed with the outer wall of the fixed ring (14).
8. The high-permeability purple glass protection mechanism for the flame detector of the automatic burner, according to claim 1, is characterized in that: the number of the clamping grooves (18) is sixty, and the sixty clamping grooves (18) are distributed on the outer wall of the fixing ring (14) in an annular array.
9. The high-permeability purple glass protection mechanism for the flame detector of the automatic burner, according to claim 1, is characterized in that: the length of the positioning pin (15) is larger than the shortest distance between the positioning hole (8) and the groove (22), and the groove (22) is a wave-shaped arc groove.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910794535.3A CN112525341B (en) | 2019-08-27 | 2019-08-27 | High-purple-glass protection mechanism for flame detector of automatic burner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910794535.3A CN112525341B (en) | 2019-08-27 | 2019-08-27 | High-purple-glass protection mechanism for flame detector of automatic burner |
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| Publication Number | Publication Date |
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| CN112525341A CN112525341A (en) | 2021-03-19 |
| CN112525341B true CN112525341B (en) | 2022-07-29 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU21395U1 (en) * | 2001-10-24 | 2002-01-20 | Общество с ограниченной ответственностью "НПО ПОЖАРНАЯ АВТОМАТИКА СЕРВИС" | HEAT FIRE DETECTOR |
| CN203364162U (en) * | 2013-06-21 | 2013-12-25 | 黑龙江省中能控制工程有限公司 | Lightpipe type flame detector probe |
| DE102015223362A1 (en) * | 2015-11-25 | 2017-06-01 | Minimax Gmbh & Co. Kg | Explosion-proof housing for means for transmitting and receiving electromagnetic radiation |
| CN208921289U (en) * | 2018-11-22 | 2019-05-31 | 南京天承新海电力科技有限公司 | A kind of high precision flame detecting device probe |
| CN209216251U (en) * | 2018-12-25 | 2019-08-06 | 桂林理工大学 | A kind of infrared and ultraviolet flame detector |
-
2019
- 2019-08-27 CN CN201910794535.3A patent/CN112525341B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU21395U1 (en) * | 2001-10-24 | 2002-01-20 | Общество с ограниченной ответственностью "НПО ПОЖАРНАЯ АВТОМАТИКА СЕРВИС" | HEAT FIRE DETECTOR |
| CN203364162U (en) * | 2013-06-21 | 2013-12-25 | 黑龙江省中能控制工程有限公司 | Lightpipe type flame detector probe |
| DE102015223362A1 (en) * | 2015-11-25 | 2017-06-01 | Minimax Gmbh & Co. Kg | Explosion-proof housing for means for transmitting and receiving electromagnetic radiation |
| CN208921289U (en) * | 2018-11-22 | 2019-05-31 | 南京天承新海电力科技有限公司 | A kind of high precision flame detecting device probe |
| CN209216251U (en) * | 2018-12-25 | 2019-08-06 | 桂林理工大学 | A kind of infrared and ultraviolet flame detector |
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| CN112525341A (en) | 2021-03-19 |
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