CN104043542A - Infiltrating irrigation head technology - Google Patents
Infiltrating irrigation head technology Download PDFInfo
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- CN104043542A CN104043542A CN201310082555.0A CN201310082555A CN104043542A CN 104043542 A CN104043542 A CN 104043542A CN 201310082555 A CN201310082555 A CN 201310082555A CN 104043542 A CN104043542 A CN 104043542A
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- infiltrating irrigation
- irrigation head
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G25/00—Watering gardens, fields, sports grounds or the like
- A01G25/02—Watering arrangements located above the soil which make use of perforated pipe-lines or pipe-lines with dispensing fittings, e.g. for drip irrigation
- A01G25/023—Dispensing fittings for drip irrigation, e.g. drippers
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- Engineering & Computer Science (AREA)
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Abstract
The invention relates to a Tai Chi infiltrating irrigation head which is an irrigation device in a plant pipeline infiltrating irrigation system. Fiber materials are adopted to form a special-shaped capillary pipeline system in the infiltrating irrigation head so as to implement infiltrating irrigation and self-pressure water supply. The structural diagram (no protecting net) of an infiltrating irrigation head assembly of the infiltrating irrigation head is as shown in accompanying drawings. A water inlet of the infiltrating irrigation head is formed at the one third to two thirds position of a heart part of a capillary tube, and propagated dirt and deposited sludge on the wall of the capillary tube are prevented from entering the infiltrating irrigation head. The length of the capillary tube is limited, so that the sludge is convenient to flow out. Structural functions of the protecting net, an external arc bracket sheet and an open water outlet prevent negative pressure substances and root systems from immersing. Due to adoption of a protecting net form, the infiltrating irrigation effect is improved; during the irrigation interval, the infiltrating irrigation head has a function of naturally and biochemically removing the sludge; when blockage occurs, pressure pulse water is adopted to carry out permeable washing; blockage removal is completed by carrying out permeable washing for about 5 times with the pulse water. Water quality needs to reach the standard that impurities in water fertilizer cannot be distinguished visually in general (no limitation to color difference). When the water fertilizer is poor in quality, particles and suspended maters can be subjected to common precipitating and filtering processing.
Description
Agriculture, woods, herd, garden industry plant pipeline slight irrigation irrigates in technology, it is an outstanding problem that douche occurs to stop up.Because water is good carrier, all kinds of organic and inorganic, the grains of sand, suspension, microorganism all can arrive douche under the delivery of water, and clogging is inevitable.Current irrigation technique is required of water-fertilizer integral, forms the heavy stasis of blood and blockage phenomenon takes place frequently especially.To water quality requirement is not high, blocking-proof result good, stifled and dead, unimpeded is quick, the life-span is long, operation and cost of manufacture is low is only practical douche.
Why this infiltrating irrigation head is called to " Tai Ji " infiltrating irrigation head? because its natural quality is very strong, its design is to escape ring medium vessels, capillary function as principle taking blood, taking close interrelated as relying on, therefore be named as " Tai Ji " infiltrating irrigation head between soil, plant, liquid manure, microorganism and natural physical phenomenon etc.
Tai Ji infiltrating irrigation head is a kind of douche in pipeline infiltrating irrigation (sub-irrigation) system.We do mechanical major, to irrigation technique and at present this field advanced technology state know very well too shallowly, separately the advanced product of this part mostly is patented product, is difficult to consult or knows very well its content, so existing advanced technology is contrasted very difficult.From conventional filtration irrigation method, as infiltrating irrigation pipe method, longitudinal cut impulse method and Mi Gong infiltration method etc., the obstruction that they all exist hollow billet wall dirt to extend, the obstruction of negative pressure refluence thing, the obstruction of sand grains and suspension, the obstruction of chemical derivative, the obstruction of root system, the obstruction of microorganism (bacterium), therefore very high to the quality requirement of irrigation system and irrigation liquid, particularly its pipeline of infiltrating irrigation and douche are embedded in soil, once stop up not easy-to-search and unimpeded.We think the douche passage that the soft materials such as direct employing rubber, plastics, PEF process, as hole-shaped, micropore shape, longitudinal cut shape, spiral narrow slit shape, close palace narrow slit shape, the tube wall matter that they form is soft, surface roughness is not fine, being stained with mud and growing dirt is easy to produce, and is also just easy to stop up.Report that from lot of documents Technique Popularizing is irrigate in this slight irrigation limited.Tai Ji infiltrating irrigation head is not avoided above-mentioned several cloggings, and we think that this is a kind of natural phenomena, how obstruction is slowed down, and how the quick restore funcitons of unimpeded is theory and the thinking of its design.We will do to introduce one by one from an infiltrating irrigation operation principle below.
One, structural principle paraphrases:
Known from structure principle chart (Fig. 1), infiltrating irrigation head is made up of an infiltrating irrigation assembly, protecting wire net two parts.And an infiltrating irrigation assembly (Fig. 2) is made up of four parts, wherein piece number 1 is called and leads hollow billet (two part), and piece number 2 is called that synthetic fibers shaping is cotton is called for short shaping cotton, and piece number 3 is called arc rack plate, and piece number 4 is called outer arcuate rack plate.
Leading hollow billet for two leads and takes from the fertile solution of setting-out and enter shaping silk floss two and receive in water hole through 2/3 place of the through hollow billet heart portion of hollow billet wall.Shaping cotton obtains the special-shaped capillary channel of required flow through inside and outside arc support sheet compression solid, the compressed shaping cotton wool thin pipe of liquid manure solution subtracts in the shaping cotton that stream is penetrated into nature (part does not suffer oppression), liquid manure in nature shaping cotton is very naturally transmitted in protecting wire net, protecting wire net contacts expansion and soil capillary system, and liquid manure is infiltrated in soil.It seems a work principle of filter, but it has 2 essential differences, and when filtration, the passage of water is perpendicular to single substantially, and it is exactly the sieve that a density is very high.And the aquaporin of Tai Ji infiltrating irrigation head is the special-shaped capillary in compliance with single substantially, filter the function of not draining foreign material in running, and Tai Ji infiltrating irrigation head there is the function of excretion foreign material in running.
So-called nature shaping cotton is exactly not compressed that a part of cellucotton.The shaping cotton of nature and the combination of protecting wire net, their approximate a kind of comparatively desirable Sponges.Sponge has sucks, stores, loses the fertile good function that discharges water.In soil, in growth course, all there is rising effect in plant always, liquid manure is constantly absorbed and evaporates, because the difference difference of soil inner structure makes rising effect everywhere also thereupon different, and the place that rising effect is stronger, soil is drier, and soil capillary reaches all the more with unobstructed.An infiltrating irrigation very large Sponge structure can be delivered to rising stronger place liquid manure, improves greatly the effect of water and fertilizer irrigation.Stopping executing after filling, the saturated liquid manure solution in Sponge is siphoned away and waits to do by soil capillary system very soon, and it will become the hotbed of growth of microorganism of a humidity, air, nutrient appropriateness.Only need temperature appropriateness, there is the long enough intermittent time, microorganism will rapidly grow in infiltrating irrigation head, the stasis of blood mud that a large amount of organic and inorganic things forms will be engulfed by microorganism, reach the effect that purifies infiltrating irrigation head, manually assisting a ruler in governing a country, lower effect is better, and the biology that Here it is will mention is below the principle of the clear stasis of blood naturally.
Two, part function design is told about:
1. lead hollow billet
Part shown in the middle piece number 1 of an infiltrating irrigation assembly profile (Fig. 2), part drawing (Fig. 3) is called leads hollow billet, two parts.It is a straight-through thin blank pipe, and outer first cylinder has a Step Shaft on one end, and the other end is Small Taper pin, Step Shaft is for being fastenedly connected with arc rack plate convex hole, Small Taper pin is connected with hollow billet for infiltrating irrigation head, and diameter of bore is 2 left and right, and it is the passage that water is imported to integer cotton from hollow billet.Require endoporus roughness Ra more than 0.4, material requires: hardness is high, and corrosion resistance is strong, generally adopts 3Cr13, and needs heat treatment or coating processing.Pottery, glass material is better.The length of leading hollow billet depends on hollow billet diameter, and fertile in 2/3 place of hollow billet heart portion because of its water intaking, object prevents that hollow billet wall dirt from extending to an infiltrating irrigation water inlet and stopping up exactly.Allow water guide tube wall is bright and clean, high hard, corrosion-resistantly can play the effect of not being stained with stasis of blood mud and growing dirt.
2. shaping cotton
In an infiltrating irrigation assembly profile (Fig. 2), the part shown in piece number 2, part drawing (Fig. 4) is called synthetic fibers dimension shaping cotton, is called for short shaping cotton.It is synthetic fibers cottons, and fineness is 0.02-0.04, average length more than 20, thickness in 10 left and right, good uniformity, density be 0.04g/CM3, figure is similar to felt, is cut into the shape of (as Fig. 3), therefore be named as shaping cotton.The material of synthetic fibers is required: good rigidly, ageing-resistant, hydrolysis, resistance toly go mouldy, chemical stability is good.The synthetic fibers such as polyester, polyamide, polyacrylonitrile all have a large amount in variety can be for selecting.Recommend a (2.6 1 bitter edible plant dioctyl phthalate 2 diester fibers).
On the cotton line of symmetry of shaping, have two to receive water through hole, aperture is 3.5.Shaping cotton presses and welds or rivet through special equipment and frock down at inside and outside arc support sheet, forms the compression cotton that is symmetrical in the 40*20 of heart portion area, 1.2 left and right thicknesses.Shaping cotton will become two states, and its heart portion is that compression shape, surrounding are nature.Compressive state part, by forming the capillary system of our required flow, is the key element of infiltrating irrigation head control water percolating capacity size.Can obtain the infiltrating irrigation head of different model (flow) by the variation of decrement.
The area at the cotton compression of shaping position is limited, and namely length capillaceous is limited, and general control is between 5-10.The cotton periphery of shaping is the shaping cotton of nature, and it is delivery port, and namely the delivery port of infiltrating irrigation head is a sponge entity, therefore delivery port is open, it easily goes out difficult stifled (refluence thing, root system stop up).
3. arc rack plate
In an infiltrating irrigation assembly profile (Fig. 2), the part shown in piece number 3, part drawing (Fig. 5) is called arc rack plate.It and the fastening formation of outer arcuate support are compressed cotton enforcement of shaping, obtain our required capillary system, the rectangle that expanded view is 40*20.Concave profile and hollow billet outer wall coincide, and have two convex holes on line of symmetry, for leading the fixing convex of hollow billet hole, have 6 bags that shove on its extrados.The bag that shoves is exactly to put several " stones " in the cotton compression of shaping position, it can make the shaping cotton at this position become pine has tightly, the capillary of short length is become to various states, show that well tranquil brook gets rid of into some stones, stream wave is risen outstandingly now to shove, shoving of forming in the time of pulse cleaning can well wash out infiltrating irrigation head by stasis of blood mud thoroughly, under serious stopping state, can promote new capillary system to produce.Intermittently time, be conducive to circulation of air, be convenient to growth of microorganism and engulf deposit.Arc rack plate is the pedestal of whole infiltrating irrigation head, and it is close to hollow billet, is two construction element of taking root of leading hollow billet.Material material is generally selected (12Cr18Ni9Si3) stainless steel cold rolled plate, and thick is 0.3.Also can adopt rigidity, the die casting of the good organic synthesis material of solid to form.
4. outer arcuate rack plate
In an infiltrating irrigation assembly profile (Fig. 2), the part shown in piece number 4, part drawing (Fig. 6) is called outer arcuate rack plate.It and arc support form antithesis, the bag that also shoves, its another function stop exactly negative pressure thing and
Root system of plant arrives in capillary system and leads hollow billet delivery port.
5. protecting wire net
Protecting wire net shown in structure principle chart (Fig. 1), it is by synthetic fibers " scarf " the line coil protecting wire net that coiling forms again after an infiltrating irrigation assembly packs hollow billet into (being no less than three layers).Synthetic fibers scarf line is exactly a kind of thicker excellent line that people are commonly used to knit scarf, this synthetic fibers scarf line is to be formed by muscle line and horizontal short flannel line articulation, it has good tensile strength muscle line, laterally short flannel line it have that water imbibition is strong, anti-mildew becomes, chemical stability is good.When coiling, be difficult for tension and be substantially similar to nature.Its function is with explanation in an infiltrating irrigation principle exhibition is stated, and its another function is can block fibrous root length around muscle line slightly to destroy infiltrating irrigation head, a principle that rope can be dead trunk exactly.
Three, execute fill with flow in process and time, flow and or number of times between relation:
Be no matter execute first fill with or afterwards repeat to execute filling, liquid manure liquid will make synthetic fibers shaping cotton swell gradually, the increase of additional lodged contamination all can make capillary channel narrow, this shows clearly in earlier stage particularly to execute filling, an infiltrating irrigation flow prompt drop is to plateau, flow is during this period of time called illusion flow, and as shown in flow and time trend Fig. 7, ab section is illusion flow line.Along with executing the growth of filling time or executing and fill with increasing of number of times, flow can decline gradually, can slowly advance to clogging, and we are called nature clogging this phenomenon, and as shown in flow and time-tendency graph Fig. 7, c point is for naturally stopping up flow point.And for example flow is filled with shown in number of times tendency chart Fig. 8 with executing, and a point is obstruction flow point naturally.From flow and time-tendency graph Fig. 7, flow and execute and fill with number of times tendency chart Fig. 8, can find out that nature clogging is the inevitable negative product of this infiltrating irrigation head.The variation of an infiltrating irrigation flow is not only relevant with time, number of times, and relevant with soil types, humidity and plant transpiration effect power, therefore the flow of infiltrating irrigation head is dynamic change.Its flow of infiltrating irrigation head that is 2L/H as design discharge is all normal operation within the scope of 2-0.3L/H.Just because this douche is being dynamic change by operating flux, so will introduce some new ideas standards.
Four, standard setting:
1, edible running water is as measuring water.
2,1.5m water column is test pressure.
3, the flow of measuring when lab platform flow rate test is taking 2H is first the real work flow of this infiltrating irrigation head.
4, when a system infiltrating irrigation average discharge is less than 0.3L/H, be called nature and stop up flow.
5, when lab platform is executed the test of filling number of times, executing the filling time is that 4H, intermittent time are in being no less than 24H.
6, while executing the test of filling number of times in soil, executing filling amount is 3L, and the intermittent time is no less than 96H.
Five, design parameter:
1, an infiltrating irrigation pressure of supply water 1.0-2.0m water column
2, design discharge 1.5-3.0L/H.
3, lab platform follow-on test generation nature duration of congestion should be greater than 96H.
4, executing of occurring when lab platform is intermittently tested that nature stops up filled with number of times and should be more than or equal to 40 times.
5, in soil, executing executing of occurring while pouring water fertilizer that nature stops up fills with number of times and should be more than or equal to 25 times.
6, be not less than 3 years service life.
Six, liquid manure solution quality requires:
1, can grain thing size, quantity generally do not limit, and only needs 10-30 minute precipitation (execute to fill with in pond or tank and carry out).
2, suspension, microorganism do not have depending on the material that can offer an explanation out, while existence, need filter with 40 order screen packs.
3, the viscosity of bubble and refined sugar solution when viscosity should be lower than 10C.
4, in soil and fertilizer, due chemical substance and value are not limit.
5, bacterial number is not limit.
Seven, clear stasis of blood unimpeded:
Tai Ji infiltrating irrigation head gives anti-blocking a lot of thinking of having done at design aspect, as two macropore conduit pipes, and open delivery port, anti-negative pressure refluence thing and root system stop up, and the useful material of institute is all anti-aging, anticorrosive.In current irrigation field, be not exclusively that to pour water be object, but the irrigation operation of water-fertilizer integral, too high to executing filling liquid quality requirement, to cause each side cost also too high, the additional infiltrating irrigation head that stifled phenomenon does not occur, so we should be placed on the design focal point of infiltrating irrigation head in effective and rapid clear stasis of blood unimpeded, makes infiltrating irrigation head stifled and not dead, slander and block up its use function of recovery by the clear stasis of blood, simultaneously relieving that the quality requirement of executing filling liquid is tried one's best.Tai Ji infiltrating irrigation head is realized this goal the method for taking biology, the clear stasis of blood unimpeded of pulse.
So-called biological clear stasis of blood unimpeded method is exactly to utilize microorganism that a large amount of stasis of blood mud in infiltrating irrigation head are engulfed.In the design concept of Tai Ji infiltrating irrigation head, we give the large large Sponge of its external structure one, and one of them major function is exactly to form to cultivate the hotbed that biological bacterium generates.Remain in its content of organics of impurity in infiltrating irrigation head very high, and organic and inorganic thing become evenly trickle cotton-shaped pair in Sponge, now air and humidity are all very desirable, biological bacterium ubiquitous in this kind of environment (it is better that workman executes vaccine), only need temperature to adapt to, there is the sufficiently long intermittent time, a large amount of microorganism that just can grow, thus play the effect of engulfing stasis of blood mud.The biology enzyme producing in a large amount of microorganism growth process can play the effect of softening (corrosion) to inorganic particulate matter, also will be engulfed or diminish, and is beneficial to discharge.But also may produce the bacterium of (rarely found) unfavorable clear stasis of blood unimpeded, be viscous fluid as produced biology enzyme simultaneously, large strain vaccine etc., occur that this phenomenon should take medicated disinfecting.
The so-called clear stasis of blood unimpeded of pulsating water method uses high pressure (20-30m water column) water at intermittence to rinse the stasis of blood mud of irrigation system hollow billet and infiltrating irrigation head position exactly.According to often returning the clear numerous order of pipeline irrigation technology to carry out, in the time cleaning hollow billet upstream, must first seal hollow billet, can not will allow the stasis of blood mud of upstream pour in hollow billet.After hollow billet has cleaned, by its head and the tail sealing, form closed container, what pulse effect will be equivalent is delivered to hollow billet everywhere, implements infiltrating irrigation head thoroughly to wash.Pulse cleaning operation sequence: feedwater continues about 5 seconds, intermittently about 10 seconds, 5 left and right of pulse should be cleaned complete.The clear stasis of blood unimpeded of pulsating water method is mainly used in irrigation system when producing nature and stopping up, or the long period is while stopping irrigation operation.
We enter slight irrigation and irrigate technical field and only have time a year and a half, knowledge in row, situation, standard are understood surplus few, with these affairs of identity of onlooker, might as well I can problem be seen to such an extent that simplify so completely, just dare courageously to do various experiments, just have our current topic case.We have irrigated near a year (balcony planting) by Tai Ji infiltrating irrigation head for soil, planted one season sponge gourd insert and planted hot pepper, planted one and taken turns celery, just planting at present winter Indian Rorippa Herb, whole easy device is normally moved.We have done again several molten water of composite fertilizer's (slag fertilizer) of taking turns colored luxuriant growth use and have executed filling simultaneously, namely infiltrating irrigation head are made to the anti-blocking experiment of super-strength.The preparation of liquid manure liquid: pour the composite fertilizer of 500 grams in 16L water abundant X and mix, filter and implement to irrigate with 40 object screen packs, execute filling by 5 circulations, nature clogging appears in end.
eight, brief description of the drawings:
Fig. 1 is infiltrating irrigation header structure schematic diagram.
Fig. 2 is an infiltrating irrigation assembly profile.
Fig. 3 is for leading hollow billet part drawing.
Fig. 4 is the cotton part drawing of shaping.
Fig. 5 is arc rack plate part drawing.
Fig. 6 is outer arcuate rack plate part drawing.
Fig. 7 is flow and time-tendency graph, illustrates: L line is that nature stops up flow line, and Ls line is design discharge line, and ab section is illusion meter flow line, and c point is for naturally stopping up flow point.
Fig. 8 is flow and number of times tendency chart, illustrates: L line is that nature stops up flow line, and a point is for naturally stopping up flow point.
Claims (5)
1. the douche in a plant pipeline infiltrating irrigation system is named Tai Ji infiltrating irrigation head.It is characterized in that the special-shaped capillary that adopts cellucotton to form a great deal of grade realize infiltrating irrigation supply water.Tai Ji infiltrating irrigation head by shaping cotton (1), lead hollow billet (2), arc rack plate (3), outer arcuate rack plate (4), protecting wire net (5) and combine.
2. according to the Tai Ji infiltrating irrigation head described in right request 1.It is characterized in that described shaping cotton (1), it needs arc rack plate (3) outer arcuate rack plate (4) to compress solid to obtain the capillary piping of the required flow of infiltrating irrigation.The cotton selected material of shaping is generally synthetic fibers, requirement to material: good rigidly, ageing-resistant, hydrolysis, resistance toly go mouldy, chemical stability is good, fineness 0.02-0.03, average length is not less than 10, do not get rid of the natural fiber by approximate this material yet, or the staple fibre of other type.
3. according to the Tai Ji infiltrating irrigation head described in right request 1.It is characterized in that the described hollow billet (2) of leading, the water inlet of infiltrating irrigation head is placed in 1/3-2/3 place of hollow billet heart portion by it.Diplopore water guide.Blasthole footpath can accomplish more than 2, and double tapered pin plays infiltrating irrigation head and is reliably connected with hollow billet.Requirement to material: hardness is not less than HRC42, rust stable metal material.Do not get rid of the nonmetallic materials by approximate this material, as pottery, glass etc. yet.
4. according to the Tai Ji infiltrating irrigation head described in right request 1.It is characterized in that described arc rack plate (3), outer arcuate rack plate (4), it has multiple bags that shove on inside and outside arc support sheet, has the two convex holes of fixedly leading hollow billet on arc rack plate.
5. according to the Tai Ji infiltrating irrigation head described in right request 1.It is characterized in that described protecting wire net, adopt synthetic fibers scarf wire loop to be around in the coil pipe racks that hollow billet forms, the number of plies is not less than 3 layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310082555.0A CN104043542B (en) | 2013-03-15 | 2013-03-15 | An a kind of infiltrating irrigation technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310082555.0A CN104043542B (en) | 2013-03-15 | 2013-03-15 | An a kind of infiltrating irrigation technology |
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| CN104043542A true CN104043542A (en) | 2014-09-17 |
| CN104043542B CN104043542B (en) | 2016-05-04 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4061272A (en) * | 1975-06-20 | 1977-12-06 | Winston Emanuel A | Irrigation device |
| CN2439178Y (en) * | 2000-06-28 | 2001-07-18 | 王玉恒 | Anti-blocking and pressure compensation type water dropping head |
| CN1662134A (en) * | 2002-05-22 | 2005-08-31 | 家庭灌溉公司 | Device and container for irrigation by capillarity |
| CN101213927A (en) * | 2008-01-17 | 2008-07-09 | 辽宁省水利水电科学研究院 | Micro moisting and irrigation suction type douche |
| US20090243146A1 (en) * | 2006-04-09 | 2009-10-01 | Netafim Ltd. | Drippers and pipe couplers |
| CN102513229A (en) * | 2011-12-06 | 2012-06-27 | 中国科学院遗传与发育生物学研究所 | Edge seam sandwich layer water seepage drip irrigation pipe/belt |
-
2013
- 2013-03-15 CN CN201310082555.0A patent/CN104043542B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4061272A (en) * | 1975-06-20 | 1977-12-06 | Winston Emanuel A | Irrigation device |
| CN2439178Y (en) * | 2000-06-28 | 2001-07-18 | 王玉恒 | Anti-blocking and pressure compensation type water dropping head |
| CN1662134A (en) * | 2002-05-22 | 2005-08-31 | 家庭灌溉公司 | Device and container for irrigation by capillarity |
| US20090243146A1 (en) * | 2006-04-09 | 2009-10-01 | Netafim Ltd. | Drippers and pipe couplers |
| CN101213927A (en) * | 2008-01-17 | 2008-07-09 | 辽宁省水利水电科学研究院 | Micro moisting and irrigation suction type douche |
| CN102513229A (en) * | 2011-12-06 | 2012-06-27 | 中国科学院遗传与发育生物学研究所 | Edge seam sandwich layer water seepage drip irrigation pipe/belt |
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| CN104043542B (en) | 2016-05-04 |
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Granted publication date: 20160504 Termination date: 20210315 |