CN104061333B - High temperature resistant pneumatic stopping valve - Google Patents
High temperature resistant pneumatic stopping valve Download PDFInfo
- Publication number
- CN104061333B CN104061333B CN201410250327.4A CN201410250327A CN104061333B CN 104061333 B CN104061333 B CN 104061333B CN 201410250327 A CN201410250327 A CN 201410250327A CN 104061333 B CN104061333 B CN 104061333B
- Authority
- CN
- China
- Prior art keywords
- valve
- flap
- sleeve
- valve body
- high temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
- F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
- F16K3/26—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members with fluid passages in the valve member
- F16K3/262—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members with fluid passages in the valve member with a transverse bore in the valve member
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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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
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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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/32—Means for additional adjustment of the rate of flow
-
- 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
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
- F16K31/1221—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being spring-loaded
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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
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
Abstract
The present invention relates to a kind of high temperature resistant pneumatic stopping valves, including valve body one, one upper joint sleeve cylinder of valve body, several open-works are provided with around sleeve wall from bottom to top, it is evenly arranged in sleeve wall, every size for enclosing identical open-work is the same, flap is installed in sleeve, flap front is provided with many apertures for flow, side is provided with streamline groove, this design be in order to prevent flap in heated high temperature, heat dissipation is slow, it is easily-deformable, it is easy to damage designed, valve rod one is set on flap, flap can be moved up and down along sleeve lining, when flap moves from bottom to top, rise the height reached according to flap, the open-work for having different inner diameters increases flow, more upward flow is bigger, on the contrary, it is more downward, the smaller flap up and down motion of flow is controlled by locator.Sleeve bottom is equipped with steel toothed washer with valve body one, two junction of valve body, plays high temperature resistant and sealing function, the drawbacks such as the configuration of the present invention is simple is easy to adjust, and pneumatic element is easy to damage.
Description
Technical field
The present invention relates to a kind of high temperature resistant pneumatic stopping valves.
Background technique
Existing high temperature resistant pneumatic stopping valve noise is big, and heat dissipation is slow, and the pneumatic element loss in valve is fast.
Summary of the invention
It is simple the technical problem to be solved by the present invention is to provide a kind of structure, valve easy to use.It realizes above-mentioned
The technical solution of purpose is as follows:
The present invention provides a kind of high temperature resistant pneumatic stopping valve, including valve body one (1) and valve body two (6), valve body two (6) is interior
It places sleeve (2), the side of sleeve (2) lower end connects valve body one (1), and sleeve (2) offers several open-works, sleeve from bottom to top
(2) flap (3) are installed in, valve rod one (4) are set on flap (3), flap (3) can be moved up and down along sleeve (2) inner wall；Set
The outside of cylinder (2) is socketed valve body two (6), and the upper end of valve body two (6) connects valve deck (7), and valve deck (7) seals sleeve (2)；Valve deck
(7) upper end connection base frame (9), the upper end of pedestal (9) connect valve head pedestal (10), valve head pedestal (10) be equipped with air inlet and
The upper end of gas outlet, valve head pedestal (10) connects valve head (12), and the inside of valve head (12) is equipped with piston 13, and piston (13) is along valve
The inner wall of head is mobile, and the upper end of piston (13) is equipped with spring (15), the upper end connection valve skull (14) of valve head (12)；
Wherein, be equipped with valve rod two (4-1) in pedestal (9), valve rod one (4) pass through behind valve deck (7) and the bottom end of pedestal (9) and
The lower end of valve rod two (4-1) connects, and the upper end of valve rod two (4-1) passes through top, valve head pedestal (10) and the piston of pedestal (9)
(13) it is protruded into after in spring (15)；
Wherein, the open-work on sleeve (2) is arranged according to the circumferencial direction of sleeve, and the open-work diameter phase on every circle circumference
Together, the open-work diameter of axial direction is not identical, from bottom to top the ascending arrangement of open-work diameter, and the diameter of the open-work is 3-
11.5mm；Adjustment sheet is provided between valve body one and valve body two；The flap (3) is substantially in a cylindrical structure, and centre has platform
Stepwise blind hole is connected with lid on flap (3), several through-holes is offered on the end face of flap (3), flap (3) medium design has
Streamline groove is arranged on the side of flap (3) for pilot pin.
When flap moves from bottom to top, rise the height reached according to flap, the open-work for having different inner diameters increases stream
Amount, more upward flow is bigger, on the contrary, more downward, and the smaller flap up and down motion of flow is controlled by locator.Structure of the invention letter
List, easy to use, practical, energy-efficient, the flap of energy, sleeve, the design of adjustment sheet efficiently solve high temperature and pneumatically end
The drawbacks such as valve noise in use is big, and flap heat dissipation is slow, easily-deformable, and it is inconvenient to adjust, and pneumatic element is easy to damage.
As preferred: valve rod two (4-1) is fastened on piston (13) by the top attaching nut of valve rod two (4-1), nut,
Valve rod two and piston is prevented to be detached from.
As preferred: high-temperature resistant seal ring is arranged on piston (13) in piston (13) and valve head (12) inner wall contact position.
As preferred: the heat-insulated graphite pads of metal hemming edge being arranged between pedestal (9) and valve head pedestal (10).
As preferred: piston (14) and the junction valve rod two (4-1) are socketed sealing on valve rod two (4-1).
As preferred: the lower end of valve rod two (4-1) is connected with high-temperature spiral gland (19), valve by being flexibly connected button (18)
It is provided with sealing ring (17) between lid (7) and valve body two (6), valve body one (1) and valve body two (6) junction are provided with activity adjustment
Screw.
As preferred: the bottom of sleeve (2) and valve body one (1), valve body two (6) junction are equipped with steel toothed washer.
The working method of high temperature resistant pneumatic stopping valve is briefly: locator controls flap and moves up and down, when flap is under
When moving upwards, rising the height reached according to flap, the open-work for having different inner diameters increases flow, and more upward flow is bigger,
On the contrary, more downward, flow is smaller, and the open-work and streamline groove opened up on flap end face passes through for flow.The configuration of the present invention is simple,
It is easy to use, the mobile high precision of handwheel.
Detailed description of the invention
Fig. 1 is schematic diagram of the present invention；
Fig. 2 is sleeve schematic diagram；
Fig. 3 is flap schematic diagram；
Fig. 4 is Fig. 3 top view；
Fig. 5 is toothed washer main view；
Fig. 6 is Fig. 5 side view.
Figure number explanation: valve body 1, sleeve 2, flap 3, valve rod 1, two 4-1 of valve rod, activity adjustment screw 5, valve body
26, valve deck 7, pedestal 9, valve head pedestal 10, gas outlet 11, valve head 12, piston 13, valve head lid 14, spring 15, adjustment sheet 16, close
Seal 17 is flexibly connected button 18, high-temperature spiral gland 19, the heat-insulated graphite pads 20 of metal hemming edge, high-temperature resistant seal ring 21, locator
22
Specific embodiment
The present invention is described in detail with reference to the accompanying drawing.
Improvement in the present invention is mainly the structure of flap, and increases adjustment sheet and adjust sleeve, wherein adjusting
Piece and to adjust sleeve be all adjustment effect according to circumstances selective installation and adjustment piece and/or can adjust sleeve.Specific structure
It is described below:
High temperature resistant pneumatic stopping valve, including valve body 1, valve body 26, the interior placement sleeve 2 of valve body 26, the one of 2 lower end of sleeve
Side connects valve body 1, and 2 inner wall of sleeve offers the open-work 2-1 of different inner diameters from bottom to top, open-work according to sleeve circumferencial direction
Arrangement, it is every circle circumference on open-work diameter it is identical, the open-work diameter of axial direction is not identical, open-work diameter from bottom to top by it is small to
Longer spread, the diameter of the open-work are 3-11.5mm.
Flap 3, preferably flap cylindrical structure are installed, centre has step blind hole, and flap is opened on end face in sleeve
Equipped with several through-hole 3-1, flap medium design has pilot pin (not shown), and streamline groove 3-2 is arranged on the side of flap,
This design is that for flap in heated high temperature, heat dissipation is slow in order to prevent, easily-deformable, easy to damage.
Valve rod 1 is set on flap, and flap 3 follows valve rod one that can move along sleeve lining, and valve rod one passes through valve deck 7
With the bottom end of pedestal 9, the outside of sleeve is socketed valve body 26, is provided with adjustment sheet 16 between valve body one and valve body two, valve body one with
Activity adjustment screw 5 is provided at sleeve connection, the upper end of valve body two connects valve deck 7, is provided between valve deck 7 and valve body two close
Seal 17, valve deck 7 seal valve body two, connection base frame 9 on valve deck 7, the upper end connection valve head pedestal 10 of pedestal, on valve head pedestal
Air inlet and air outlet 11 are provided with, the upper end of valve head pedestal connects valve head 12, has piston 13 in valve head, piston 13 is along valve
The inner wall of head is mobile, and two 4-1 of valve rod passes through piston, valve head pedestal, pedestal and connect behind top with valve rod one, valve rod one and valve rod two
High-temperature spiral gland 19 is connected by being flexibly connected 18 connection of button, while at the top of valve rod one, valve rod one is in movable process
In by high-temperature spiral gland prevent valve rod one be flexibly connected button be detached from.The upper end connection valve skull 14 of valve head, valve head lid with
Elastic element is set between valve rod two, and the preferred spring 15 of elastic element, the top of valve rod two is socketed on spring 15.Pedestal and valve
Metal hemming edge heat-insulated graphite pads 20 are set between head pedestal, locator 22 and air inlet, gas outlet are set on valve head lid 14.Piston
With valve head inner wall contact position, high-temperature resistant seal ring 21 is set on piston.Sleeve bottom is equipped with valve body one, two junction of valve body
Steel toothed washer, steel dentiform gasket enclose high temperature resistant and sealing function, why use steel toothed washer, be because of its tooth form
Design makes sleeve bottom more coincide with valve body one, the connection of valve body upper and lower end face, and leakproofness is strong, is unlikely to deform under high temperature action
And damage.Entire part in attached drawing 1 of the present invention on the heat-insulated graphite pads 20 of metal hemming edge should be referred to as valve in this industry
Head also makes pneumatic actuator also be cylinder, is commonly called as pneumatic head, and description has been carried out component dismantling for convenience.
The through-hole 3-1 opened up on flap is the aperture for flow, and side is provided with streamline groove 3-2, this design be in order to
Prevent flap in heated high temperature, heat dissipation is slow, and it is easily-deformable, it is easy to damage designed, when flap moves from bottom to top, according to flap
Rise the height reached, the open-work for having different inner diameters increases flow, and more upward flow is bigger, and on the contrary, more downward, flow is got over
Small flap up and down motion is controlled by locator 22.After flap is connect with valve rod one, in order to avoid flap and valve rod one are detached from,
The bottom of flap connects a nut.
The through-hole 3-1 opened up on flap can be adjusted according to valve aperture size, and valve aperture is bigger, required open-work
Quantity will increase, and open-work internal diameter can also become larger.
Water flows into sleeve from valve body one in the prior art, and the application is for the valve in hot environment, valve temperature
After height, water can generate gas and enter in the gap between flap and sleeve, although the gap between flap and sleeve is special
Small, water can also enter in sleeve occasionally through gap, and the gas of high temperature and water can not be discharged in time in use in order to prevent
And flap is easy situations such as stuck of swelling under high temperature environment, so being provided with many apertures on flap and opening around flap
There is the streamline groove for supplying water and flowing back, makes the water entered in sleeve, gas flow back again from the open-work on flap, and flap meeting
It is risen or fallen according to the water level for entering valve body one, water can also be flowed out from open-work, in order to control the water flowed out from open-work
Amount, allows the height of flap that positioning is adjusted, since the diameter of different height open-work is inconsistent, works as by locator
When the height difference of flap, the water flowed out from open-work can carry out quantitative outflow.
The configuration of the present invention is simple, easy to use, practical, energy-efficient, the flap of energy, the design of sleeve, adjustment sheet has
It is big that effect solves high temperature pneumatic stopping valve noise in use, and flap heat dissipation is slow, easily-deformable, and it is inconvenient to adjust, and pneumatic element is easy
The drawbacks such as damage.
The structure of pedestal and flap is changed in the present invention, and has installed adjustment sheet additional between valve body one and valve body two, this
The change of structure can make noise of the invention small in invention, rapid heat dissipation, reduce the pneumatic component of valve in use
Loss in the high temperature environment extends the service life of valve, beautiful and generous, and valve in use section according to institute
The uninterrupted needed passes through any adjusting of adjustment sheet, and the valve flap structure in the present invention keeps flow more controllable, rapid heat dissipation, no
It can temperature distortion.
The above is only the preferred embodiments of the embodiment of the present invention, are not intended to limit the invention embodiment, all at this
Within the spirit and principle of inventive embodiments, any modification, equivalent replacement, improvement and so on be should be included in of the invention real
It applies in the protection scope of example.
Claims (7)
1. high temperature resistant pneumatic stopping valve, it is characterised in that: including valve body one (1) and valve body two (6), the interior housing sleeve of valve body two (6)
The side of cylinder (2), sleeve (2) lower end connects valve body one (1), and sleeve (2) offers several open-works from bottom to top, and sleeve (2) is interior
It installs flap (3), valve rod one (4) is set on flap (3), flap (3) can be moved up and down along sleeve (2) inner wall；Sleeve (2)
Outside be socketed valve body two (6), the upper end of valve body two (6) connects valve deck (7), and valve deck (7) seals sleeve (2)；Valve deck (7)
The upper end of upper end connection base frame (9), pedestal (9) connects valve head pedestal (10), and valve head pedestal (10) is equipped with air inlet and outlet
Mouthful, the upper end of valve head pedestal (10) connects valve head (12), and the inside of valve head (12) is equipped with piston 13, and piston (13) is along valve head
Inner wall is mobile, and the upper end of piston (13) is equipped with spring (15), the upper end connection valve skull (14) of valve head (12)；
Wherein, be equipped with valve rod two (4-1) in pedestal (9), valve rod one (4) pass through behind valve deck (7) and the bottom end of pedestal (9) with valve rod
The lower end of two (4-1) connects, after the upper end of valve rod two (4-1) passes through top, valve head pedestal (10) and the piston (13) of pedestal (9)
It protrudes into spring (15)；
Wherein, the open-work on sleeve (2) is arranged according to the circumferencial direction of sleeve, and the open-work diameter on every circle circumference is identical, axis
Open-work diameter to direction is not identical, from bottom to top the ascending arrangement of open-work diameter, and the diameter of the open-work is 3-11.5mm；
Adjustment sheet is provided between valve body one and valve body two；The flap (3) is substantially in a cylindrical structure, and centre has step blind
Hole is connected with lid on flap (3), several through-holes is offered on the end face of flap (3), and flap (3) medium design has pilot pin,
Streamline groove is set on the side of flap (3).
2. high temperature resistant pneumatic stopping valve according to claim 1, it is characterised in that: the top of valve rod two (4-1) connects spiral shell
Valve rod two (4-1) is fastened on piston (13) by mother, nut, and valve rod two and piston is prevented to be detached from.
3. high temperature resistant pneumatic stopping valve according to claim 1, it is characterised in that: piston (13) connects with valve head (12) inner wall
High-temperature resistant seal ring is arranged on piston (13) in synapsis.
4. high temperature resistant pneumatic stopping valve according to claim 3, it is characterised in that: pedestal (9) and valve head pedestal (10) it
Between be arranged the heat-insulated graphite pads of metal hemming edge.
5. high temperature resistant pneumatic stopping valve according to claim 1, it is characterised in that: piston (14) and valve rod two (4-1) are even
Place is met, is socketed sealing on valve rod two (4-1).
6. high temperature resistant pneumatic stopping valve according to claim 1, it is characterised in that: the lower end of valve rod two (4-1) passes through work
Dynamic connection buckle (18) are connected with high-temperature spiral gland (19), and sealing ring (17), valve are provided between valve deck (7) and valve body two (6)
Body one (1) and valve body two (6) junction are provided with activity adjustment screw.
7. high temperature resistant pneumatic stopping valve according to claim 1, it is characterised in that: the bottom of sleeve (2) and valve body one
(1), valve body two (6) junction is equipped with steel toothed washer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410250327.4A CN104061333B (en) | 2014-06-06 | 2014-06-06 | High temperature resistant pneumatic stopping valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410250327.4A CN104061333B (en) | 2014-06-06 | 2014-06-06 | High temperature resistant pneumatic stopping valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104061333A CN104061333A (en) | 2014-09-24 |
| CN104061333B true CN104061333B (en) | 2019-03-01 |
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ID=51549192
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410250327.4A Expired - Fee Related CN104061333B (en) | 2014-06-06 | 2014-06-06 | High temperature resistant pneumatic stopping valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104061333B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104344069A (en) * | 2014-10-20 | 2015-02-11 | 浙江亿科阀门有限公司 | Improved sleeve regulating valve |
| CN104676060B (en) * | 2015-02-09 | 2018-05-29 | 温州市隆潮阀门有限公司 | Pressure reduction non-return digital control valve |
| CN110513488A (en) * | 2019-08-31 | 2019-11-29 | 中国石油集团川庆钻探工程有限公司 | A kind of separator regulating valve and separator |
| CN112682379B (en) * | 2020-12-28 | 2022-12-30 | 江苏力博士机械股份有限公司 | Frequency modulation valve on hydraulic breaking hammer |
| CN113864473A (en) * | 2021-09-09 | 2021-12-31 | 安徽安荣新能源科技有限公司 | Lightweight high strength low temperature step-down valve body |
| CN117231758B (en) * | 2023-11-13 | 2024-01-09 | 高碑店市航之辉机械设备有限公司 | High-temperature-resistant stop valve for spaceflight |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0893964A (en) * | 1994-09-20 | 1996-04-12 | Yamatake Honeywell Co Ltd | Valve device |
| CN201502724U (en) * | 2007-12-28 | 2010-06-09 | 罗普阀业（宜兴）有限公司 | Pneumatic adjusting valve |
| CN203453480U (en) * | 2013-09-17 | 2014-02-26 | 浙江石化阀门有限公司 | Cage type dual-base balance sleeve regulating valve |
| CN203594871U (en) * | 2013-12-02 | 2014-05-14 | 浙江富鼎自控阀门有限公司 | Novel pneumatic adjusting valve |
| CN203979420U (en) * | 2014-06-06 | 2014-12-03 | 温州市隆潮阀门有限公司 | High temperature resistant pneumatic stopping valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201866298U (en) * | 2010-11-04 | 2011-06-15 | 天津百利展发集团有限公司 | High-pressure balanced quantitative regulating valve |
-
2014
- 2014-06-06 CN CN201410250327.4A patent/CN104061333B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0893964A (en) * | 1994-09-20 | 1996-04-12 | Yamatake Honeywell Co Ltd | Valve device |
| CN201502724U (en) * | 2007-12-28 | 2010-06-09 | 罗普阀业（宜兴）有限公司 | Pneumatic adjusting valve |
| CN203453480U (en) * | 2013-09-17 | 2014-02-26 | 浙江石化阀门有限公司 | Cage type dual-base balance sleeve regulating valve |
| CN203594871U (en) * | 2013-12-02 | 2014-05-14 | 浙江富鼎自控阀门有限公司 | Novel pneumatic adjusting valve |
| CN203979420U (en) * | 2014-06-06 | 2014-12-03 | 温州市隆潮阀门有限公司 | High temperature resistant pneumatic stopping valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104061333A (en) | 2014-09-24 |
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Granted publication date: 20190301 Termination date: 20210606 |