CN105082388A - Adjustable n-shaped mixer - Google Patents
Adjustable n-shaped mixer Download PDFInfo
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- CN105082388A CN105082388A CN201510219526.3A CN201510219526A CN105082388A CN 105082388 A CN105082388 A CN 105082388A CN 201510219526 A CN201510219526 A CN 201510219526A CN 105082388 A CN105082388 A CN 105082388A
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Abstract
The invention relates to an adjustable n-shaped mixer. The mixer is in an n shape. A motor connecting shaft which is connected with a motor is arranged on the upper portion of the mixer. A cuboid screw type mixing blade adjuster is welded to the lower end of the motor connecting shaft. Tooth sliding blocks which are located in a slideway and engaged with the slideway are pushed by rotating a screw, so that mixing blades fixed to the lower portions of the tooth sliding blocks are driven, and the distance between the two mixing blades is adjusted to be adapted to different cylindrical containers. Each mixing blade is in the shape of an inverted L, and in order to improve the mixing effect, the included angle between the transverse direction of the mixing part of each mixing blade and the tangent line of a rotating arc of the mixing part of the mixing blade is 35 degrees. The purpose of even mixing is achieved through revolution of the mixing blades and a lower revolution speed, and thus side effects of mechanical shearing on a polymer solution are reduced to the maximum extent in the preparation process. The adjustable n-shaped mixer is mainly used for stirring in the indoor polymer solution preparation process.
Description
Technical field
The present invention relates to the stirring instrument and equipment of a kind of high molecular polymer in obtained aqueous solution process, particularly a kind of adjustable N-shaped mixer.
Background technology
In recent years, due to the characteristic that high molecular weight water soluble polymer (calling polymer in the following text) is exclusive, its application is expanded gradually, be widely used in oil industry, water treatment, papermaking, textile printing and dyeing, the fields such as mining, the characteristic of its macromolecule thickening is mainly utilized to be widely used in drilling fluid thickening and lubrication in the oil industry, in oil recovery process, tertiary oil recovery improves recovery ratio and profile control, water blockoff measure etc., in order to ensure or improve effect, all a large amount of indoor and field trial will be carried out before application, also to constantly be adjusted by laboratory test in application process, no matter be laboratory test, in field trial or application process, the preparation of polymer is absolutely necessary a procedure, so-called preparation is exactly slowly add polymer beads in the water stirred, it is made to disperse gradually in water, water suction, expand, dissolve, the mixer of current prepared polymer application is mostly revolving vane formula mixer, i.e. driven by motor central shaft, the other end of central shaft is fixed wtih stirrer paddle, motor, central shaft, blade synchronous axial system, because the continuous rotation of blade just makes internal tank liquid agitation.Current this mixer prepared polymer existing problems:
1. due to polymer characteristics that polymer is exclusive, a kind of " axial pole-climbing " phenomenon has been there is in course of dissolution, namely high molecular polymer swelling after can be wrapped in rotation mixing arm and central shaft on, and climb gradually along central shaft, along with this phenomenon of the increase of polymer concentration in water also can be thereupon serious, the polymer be wound around on center shaft is difficult to be dissolved in water again, has occurred again the inaccurate and non-uniform phenomenon of polymer concentration in water.
2. along with the continuous dissolving of polymer in water, the viscosity of the aqueous solution is in continuous increase, flow resistance also increases thereupon, from paddle more away from the velocity of rotation of position solution slower, solution in container is reached rotating speed that desirable mixing effect must improve paddle, but (such as prepare the polymer of higher concentration) when viscosity acquires a certain degree, even if paddle velocity of rotation is fast again, the solution on top also can rotate very slow, even close to inactive state, lose the object of uniform stirring like this.
3. what polymer solution was afraid of most in motion process is exactly mechanical shearing, rotating machinery shears the viscosity that can reduce solution, test shows, molecular weight is the polymer of 2,500 ten thousand, with the revolving vane formula mixer of 5000 revs/min, stirring 10 minutes viscosity loss velocity can reach about 40%, and the loss late of polymer solution viscosity increases along with the increase of polymer molecular weight, increase along with the prolongation of mixing time, increase along with the increase of mixing speed.
And the time of stirring during each laboratory test prepared polymer generally all exceedes half an hour, the viscosity loss that the concentration that can only increase polymer to reach design viscosity produces to compensate mechanical shearing, thus add unnecessary cost.
Summary of the invention
For the defect that prior art is above-mentioned, the technical problem to be solved in the present invention is to provide a kind of adjustable N-shaped mixer, and Quick uniform stirs polymer, does not lose polymer viscosity simultaneously.
For solving the problems of the technologies described above, the adjustable N-shaped mixer of the present invention is by bracing frame 1, power supply speed regulator 2, motor 3, motor connecting axle 4, stirring piece adjuster 5, screw rod clamp 6, screw rod 7, box body plug 8, handwheel 9, slideway 10, teeth slide block 11, stirring piece 12 and motor dop 13 form, above-mentioned motor 3 is arranged on bracing frame 1 base, power supply speed regulator 2 and motor 3 are electrically connected, motor 3 lower end arranges motor dop 13, motor connecting axle 4 upper end is stuck in motor dop 13 lower end, motor connecting axle 4 lower end is welded on the centre position of stirring piece adjuster 5 cartridge upper surface, screw rod 7 is arranged on the axially middle part of stirring piece adjuster 5 box body, screw rod 7 two ends are each passed through the centre bore of the box body plug 8 at stirring piece adjuster 5 two ends, handwheel 9 is threaded with screw rod 7 two ends outside box body plug 8, the two ends of screw rod 7 in stirring piece adjuster 5 box body and mid portion install screw rod clamp 6, screw rod 7 is divided into two sections by screw rod clamp 6 and two sections of hand of spiral differences, slideway 10 is arranged on stirring piece adjuster 5 box body bottom, screw rod clamp 6 is fixedly connected with slideway 10, screw rod 7 two sections installs the teeth slide block 11 with screw rod 7 threaded engagement respectively, teeth slide block 11 bottom is stuck in slideway 10, teeth slide block 11 installs the stirring piece 12 in inverted "L" shaped below.
As a modification of the present invention, the transverse direction of above-mentioned stirring piece 12 mixing part and its rotate circular arc tangent line be the angle of 35 degree.
Above-mentioned teeth slide block 11 is impartial with the axial centre positional distance of screw rod 7.
Above-mentioned stirring piece adjuster 5 box body is cuboid.
The invention provides a kind of adjustable N-shaped mixer, comprise cradle portion, electric drive and mixing part, described mixing part and electric drive are arranged in described cradle portion, and described electric drive drives described mixing part, described mixing part comprises: stirring piece adjuster, is connected with described electric drive; Screw rod, the longitudinal direction along the box body of described stirring piece adjuster is arranged, and described screw rod has two different thread segments of hand of spiral; Two teeth slide blocks, described two thread segments different from hand of spiral are respectively engaged mutually; Two inverted L-shaped stirring pieces, are connected to the lower end of described two teeth slide blocks.
Further, described adjustable N-shaped mixer also comprises screw rod clamp, box body plug, handwheel and slideway, wherein, screw rod is inserted in the longitudinal middle part of the box body of described stirring piece adjuster, described screw rod two ends are each passed through the centre bore of the box body plug at stirring piece adjuster two ends, described handwheel is threaded with the two ends outside box body plug of described screw rod, two ends in the box body of described stirring piece adjuster and mid portion install screw rod clamp, described slideway is arranged on the box body bottom of described stirring piece adjuster, described screw rod clamp is fixedly connected with described slideway, described teeth slide block bottom is stuck in described slideway.
Further, described cradle portion comprises bracing frame, described electric drive comprises power supply speed regulator, motor, motor connecting axle and motor dop, wherein, described motor is arranged on support frame as described above base, and described power supply speed regulator is electrically connected with described motor, and described motor lower end is provided with described motor dop, described motor connecting axle upper end is stuck in described motor dop lower end, and described motor connecting axle lower end is welded on the centre position of the cartridge upper surface of described stirring piece adjuster.
Further, the tangent line of the rotation circular arc at the bearing of trend of described stirring piece in the cross section perpendicular to described motor connecting axle and this stirring piece outer rim place is the angle of 35 degree.
Further, the axial centre positional distance of described teeth slide block and described screw rod is impartial.
Further, described stirring piece adjuster box body is cuboid.
Compared with present technical scheme, the present invention's adjustable N-shaped mixer is stable and reliable for performance, test result data repeatability better, same sample repeats difference < 10%, overcoming the axial rod climbing phenomenon of polymer in course of dissolution, although mixing speed significantly reduces, stirring more abundant than rotating paddle mixer, thus considerably reduce mechanical shearing phenomenon, reduce more than 10% than by polymer solution viscosity loss late during revolving vane formula mixer.
The present invention's adjustable N-shaped mixer is with the advantage such as simple to operate, stable performance, reliable operation, and the people farthest reduced in development test process for preparation is the viscosity loss phenomenon caused.Ensure that the authenticity of polymer solution in process for preparation.
Accompanying drawing explanation
Fig. 1 is the structural representation of the adjustable N-shaped mixer of the present invention;
Fig. 2 is stirring piece schematic diagram;
Fig. 3 is the angle schematic diagram of stirring piece for mixing part;
Fig. 4 is the effect diagram of different mixing time to polymer solution viscosity.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
As shown in Figure 1, according to the specification shape of existing prepared polymer container, the characteristic of the water-soluble process of conjugated polymer, have developed the adjustable N-shaped mixer of the present invention.The adjustable N-shaped mixer of the present invention is made up of bracing frame 1, power supply speed regulator 2, motor 3, motor connecting axle 4, stirring piece adjuster 5, screw rod clamp 6, screw rod 7, box body plug 8, handwheel 9, slideway 10, teeth slide block 11, stirring piece 12 and motor dop 13.The shape of the adjustable N-shaped mixer of the present invention, like " n " type, is divided into two parts to form: one is electric drive and holder part generally; Two is mixing parts.
1. electric drive and holder part
Comprise electric machine support 1, power supply speed regulator 2, motor 3 and motor dop 13.
2. mixing part
The top of mixing part is the motor connecting axle 4 be connected with motor 3, the upper end of motor connecting axle 4 is stuck on motor dop 13, the lower end of motor connecting axle 4 is fixedly connected on stirring piece adjuster 5 box body of a cuboid, motor connecting axle 4 is welded on the centre position above box body, and the adjusting device of stirring piece is equipped with in the inside of box body.
Stirring piece adjuster 5: middle part longitudinal in stirring piece adjuster 5 is provided with the screw rod 7 of a bidirectional helical, the screw thread of screw rod 7 is divided into two parts screw thread of different directions, the screw thread of the left-half of screw rod 7 is left hand thread, the screw thread of right half part is right-handed thread, the pitch of both sides screw thread, tooth form, diameter, identical length is same, only have hand of spiral different, the centre of screw rod and the two ends of threaded portion are without screw thread place, the unthreaded portion of screw rod 7 is less than there being the diameter of threaded portion, without screw thread place, screw rod clamp 6 is housed at tray interior screw rod 7 respectively, three screw rod clamps 6 altogether, the both sides of each screw rod clamp 6 are screwed on the slideway 10 of bottom, can prevent screw rod 7 from moving freely like this, a handwheel 9 for rotary screw is housed respectively in the outside of the box body plug 8 at screw rod 7 two ends, handwheel 9 is threaded with screw rod 7, the teeth slide block 11 that one engaged with screw thread is respectively had in the lower end of screw rod 7 left hand thread and right-handed thread part, two teeth slide blocks 11 are equal with screw rod 7 longitudinal center positional distance, respectively there are two wings the both sides of each teeth slide block 11 bottom, the wing is stuck in the groove of slideway 10, when twisting handwheel when driving screw rod 7 to rotate, two teeth slide blocks 11 can along slideway 10 synchronously near or to away from movement, so then remain that two teeth slide blocks 11 are with the centre distance of screw rod 7 longitudinal direction equal, thus keep the stable and balance of mixer in operation process.Two teeth slide blocks 11 two corresponding stirring pieces 12 are housed below respectively, stirring piece is inverted "L" shaped, the top of stirring piece is screwed in the bottom of teeth slide block 11, when screw rod 7 rotates, stirring piece can along with teeth slide block 11 synchronizing moving, thus the distance reached between adjustment two stirring pieces 12, to adapt to the needs of different large small container.
The present invention's adjustable N-shaped mixer is two corresponding stirring pieces 12.The shape of two stirring pieces is similar, stirring piece is inverted " L " shape, and the top of each stirring piece 12 is in level, and has two screw holes for being fixedly connected with teeth slide block 11, the bottom at right angle is the stirring piece 12 playing stirring action with it, as shown in Figure 2.
The angle and direction of mixing part, two stirring piece 12 bottoms is all identical, the transverse direction for mixing part of stirring piece 12 with rotate circular arc tangent line be the angle of 35 degree, as shown in Figure 3, can stirring efficiency be improved like this, solution is stirred more abundant.Arc-shaped is all processed in the place of the former corner angle in mixing part of stirring piece, is so more conducive to reducing the shearing caused because of mechanical shearing polymer solution.
Effect test of the present invention
Test one, mixing effect is tested
In order to verify the invention effect of adjustable N-shaped mixer, we have carried out contrast test with revolving vane formula mixer under similarity condition, and test case is as follows:
Test objective: test in prepared polymer aqueous solution process, paddle mixer and adjustable N-shaped mixer are on mixing effect and the impact on solution viscosity.
Two kinds of mixers, under same rotational speed condition, contrast polymer solution mixing effect; Mechanical shearing is on the impact of polymer solution viscosity; During different rotating speeds, the mixing effect of polymer solution is contrasted.
Experimental condition: normal temperature and pressure, natural environment.
1. test apparatus and medicine are in table 1:
Table 1 instrument and medicine
2, require:
(1) polymer formulation concentration is 0.4%.
(2) mixer rotating speed: adjustable.
(3) in whipping process, note the phenomenon of observing each preparation sample, and make a record.
3, compound method:
(1) load 1600ml water with the beaker of 2000ml, under being placed on mixer, and debug to suitable height, open the running water in two mixers stirring cups simultaneously, and rotating speed is adjusted to desired speed.
(2) weigh polymer beads 64 grams, totally two parts, respectively in the water respectively to two beakers slowly add polymer beads portion.
More than be one group, often adjust a mixing speed later and again do one group according to above method.
4, test situation describes and analyzes
Prepared polymer solution initial stage two kinds of mixers are mixing effect contrast under different rotating speeds condition, and test situation is in table 2.
Table 2 prepared polymer solution initial stage two kinds of mixers are mixing effect contrast when different rotating speeds
Phenomenon analysis:
1. as can be seen from the description under different speed conditions, each mixer is all the raising along with rotating speed, the rotary speed of liquid in container also improves thereupon, the sinking degree of liquid level is also in continuous aggravation, with this understanding N-shaped mixer rotating speed close to or more than 400 revs/min time, internal tank liquid due to rotary speed too fast and screwed out by mouth from container, test finds that this mixer is 50 ~ 100 revs/min than better suited ideal velocity with this understanding.
2. after polymer solution stirs 10 minutes, the concentration of the polymer in water increases gradually, the viscosity of solution increases simultaneously, the mixing effect of paddle mixer starts to decline, a part absorbs water, polymer beads in course of dissolution has been wrapped on paddle and shaft, starts to occur " pole-climbing " phenomenon.
3. after polymer solution stirs 30 minutes, along with the dissolving gradually of polymer beads, the viscosity of solution constantly increases, the mixing effect of paddle mixer also declines thereupon, the polymer solution that paddle stirs with the speed of 400 turns per minute is rotating except the solution near paddle thereupon, all the other major parts, close to inactive state, have lost overall stirring meaning.
And can also slowly rotate with the entirety of the polymer solution of 800 turns of fair speed Stirrings per minute, the winding of polymer is also more obvious with " pole-climbing " phenomenon simultaneously. thereuponIf make polymer solution in process for preparation fully be stirred, the rotating speed of mixer must be improved under existence conditions.
4. the polymer solution that adjustable N-shaped mixer stirs remains solution in container and mixer synchronous rotary, although polymer beads can make the viscosity thickening gradually of solution in course of dissolution, but the mixing effect of this mixer is not affected, and there is no " pole-climbing " phenomenon.Under this condition, the rotating speed of adjustable N-shaped mixer just can reach more satisfactory mixing effect 50 ~ 100 revs/min time.
Test two, different mixing time is on the impact of polymer solution viscosity:
Two kinds of mixers are under setting speed condition, and by the contrast test of solution viscosity change after the stirring to polymer solution different time, test case, as shown in Figure 4, different mixing time is on the impact of polymer solution viscosity.
Test case is analyzed
1. can find out a common rule by above two groups of tests with condition, the viscosity of this polymer solution preparation initial stage solution is in continuous growth, peak the phase to about one and a half hours viscosity, viscosity growth afterwards obviously slows down, after two hours, viscosity is close to stable, can determine from the Changing Pattern of viscosity, the dissolution velocity of polymer beads in water is more slowly.
2. the regularity of liang group data is basically identical, in in the early stage 90 minutes, the viscosity of the polymer solution of two mixer stirrings is all be in ascent stage faster, but the viscosity rate of climb of the polymer solution that paddle mixer stirs is slower, although this is because in solution the concentration of polymer in continuous increase, but there is mechanical shearing in the polymer dissolved in advance, result in the loss of a part of viscosity, and N-shaped mixer just can make solution be stirred fully when very low rotating speed, significantly alleviate the viscosity loss that polymer solution produces due to mechanical shearing.Now reduce viscosity loss velocity more than 10%.
3. after 90 minutes, the thickening behavior of the polymer solution that N-shaped mixer stirs obviously slows down, this is because most of polymer beads is dissolving before completely, is only having and does not have consoluet bulky grain polymer to dissolve in continuation on a small quantity.The viscosity loss side effect produced for the mechanical shearing of paddle mixer masks the thickening power of this partial polymer substantially, demonstrates solution viscosity and has a declining tendency.
4. along with the prolongation of mixing time, the side effect that mechanical shearing produces manifests gradually, the gap of the viscosity number of the polymer solution that two kinds of mixers stir also is increasing gradually, but viscosity loss velocity is not unlimited increase, and after about 3 hours, the decrease speed of viscosity is more and more slower.
The adjustable N-shaped mixer of the present invention for mixing part non-stop layer rotating shaft, efficiently solve the pole-climbing problem of polymer in process for preparation.This mixer is when low speed rotation, and the liquid of internal tank can obtain overall synchronous axial system fully, improves stirring efficiency.Stirring at low speed effectively reduces the viscosity loss that polymer solution causes due to mechanical shearing in process for preparation.And the spacing of two stirring pieces is adjustable to adapt to the wide-mouth tube type container varied in size.The preparation stirring being applicable to viscous fluid especially has very strong advantage to the polymer solution of high thickness " slide wall ".
Claims (10)
1. an adjustable N-shaped mixer, by bracing frame (1), power supply speed regulator (2), motor (3), motor connecting axle (4), stirring piece adjuster (5), screw rod clamp (6), screw rod (7), box body plug (8), handwheel (9), slideway (10), teeth slide block (11), stirring piece (12) and motor dop (13) composition, it is characterized in that: described motor (3) is arranged on bracing frame (1) base, power supply speed regulator (2) and motor (3) are electrically connected, motor (3) lower end arranges motor dop (13), motor connecting axle (4) upper end is stuck in motor dop (13) lower end, motor connecting axle (4) lower end is welded on the centre position of stirring piece adjuster (5) cartridge upper surface, screw rod (7) is inserted in the longitudinal middle part of stirring piece adjuster (5) box body, screw rod (7) two ends are each passed through the centre bore of the box body plug (8) at stirring piece adjuster (5) two ends, handwheel (9) is threaded with at box body plug (8) screw rod outward (7) two ends, the two ends of screw rod (7) in stirring piece adjuster (5) box body and mid portion install screw rod clamp (6), screw rod (7) is divided into two sections and two sections of hand of spiral differences by screw rod clamp (6), slideway (10) is arranged on stirring piece adjuster (5) box body bottom, screw rod clamp (6) is fixedly connected with slideway (10), screw rod (7) two sections installs the teeth slide block (11) with screw rod (7) threaded engagement respectively, teeth slide block (11) bottom is stuck in slideway (10), teeth slide block (11) installs the stirring piece (12) in inverted "L" shaped below.
2. adjustable N-shaped mixer according to claim 1, is characterized in that: the transverse direction of described stirring piece (12) mixing part and its rotate circular arc tangent line be the angle of 35 degree.
3. adjustable N-shaped mixer according to claim 1, is characterized in that: described teeth slide block (11) is impartial with the axial centre positional distance of screw rod (7).
4. adjustable N-shaped mixer according to claim 1, is characterized in that: described stirring piece adjuster (5) box body is cuboid.
5. an adjustable N-shaped mixer, is characterized in that, comprises cradle portion, electric drive and mixing part, and described mixing part and electric drive are arranged in described cradle portion, and described electric drive drives described mixing part, and described mixing part comprises:
Stirring piece adjuster (5), is connected with described electric drive;
Screw rod (7), the longitudinal direction along the box body of described stirring piece adjuster (5) is arranged, and described screw rod (7) has two different thread segments of hand of spiral;
Two teeth slide blocks (11), described two thread segments different from hand of spiral are respectively engaged mutually;
Two inverted L-shaped stirring pieces (12), are connected to the lower end of described two teeth slide blocks (11).
6. adjustable N-shaped mixer according to claim 5, is characterized in that, described adjustable N-shaped mixer also comprises screw rod clamp (6), box body plug (8), handwheel (9) and slideway (10),
Wherein, screw rod (7) is inserted in the longitudinal middle part of the box body of described stirring piece adjuster (5), described screw rod (7) two ends are each passed through the centre bore of the box body plug (8) at stirring piece adjuster (5) two ends, described handwheel (9) is threaded at box body plug (8) two ends outward with described screw rod (7), two ends in the box body of described stirring piece adjuster (5) and mid portion install screw rod clamp (6), described slideway (10) is arranged on the box body bottom of described stirring piece adjuster (5), described screw rod clamp (6) is fixedly connected with described slideway (10), described teeth slide block (11) bottom is stuck in described slideway (10).
7. adjustable N-shaped mixer according to claim 5, it is characterized in that, described cradle portion comprises bracing frame (1), described electric drive comprises power supply speed regulator (2), motor (3), motor connecting axle (4) and motor dop (13)
Wherein, described motor (3) is arranged on support frame as described above (1) base, described power supply speed regulator (2) is electrically connected with described motor (3), described motor (3) lower end is provided with described motor dop (13), described motor connecting axle (4) upper end is stuck in described motor dop (13) lower end, and described motor connecting axle (4) lower end is welded on the centre position of the cartridge upper surface of described stirring piece adjuster (5).
8. adjustable N-shaped mixer according to claim 5, it is characterized in that, the tangent line of the rotation circular arc at the bearing of trend of described stirring piece (12) in the cross section perpendicular to described motor connecting axle (4) and this stirring piece (12) outer rim place is the angle of 35 degree.
9. adjustable N-shaped mixer according to claim 5, is characterized in that, described teeth slide block (11) is impartial with the axial centre positional distance of described screw rod (7).
10. adjustable N-shaped mixer according to claim 5, is characterized in that, described stirring piece adjuster (5) box body is cuboid.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510219526.3A CN105082388B (en) | 2014-05-14 | 2015-04-30 | Adjustable n-type mixer |
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| CN201410204124 | 2014-05-14 | ||
| CN2014102041241 | 2014-05-14 | ||
| CN201510219526.3A CN105082388B (en) | 2014-05-14 | 2015-04-30 | Adjustable n-type mixer |
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| CN105082388B CN105082388B (en) | 2018-06-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104923100A (en) * | 2015-06-05 | 2015-09-23 | 中国石油天然气股份有限公司 | Adjustable stirring machine |
| CN110154259A (en) * | 2019-06-17 | 2019-08-23 | 西安文贝知识产权服务有限公司 | A kind of thermoplastic composite injection moulding material viscosity regulating device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104923100A (en) * | 2015-06-05 | 2015-09-23 | 中国石油天然气股份有限公司 | Adjustable stirring machine |
| CN110154259A (en) * | 2019-06-17 | 2019-08-23 | 西安文贝知识产权服务有限公司 | A kind of thermoplastic composite injection moulding material viscosity regulating device |
| CN110154259B (en) * | 2019-06-17 | 2021-04-23 | 湖南省建新建材有限公司 | Raw material viscosity adjusting device for thermoplastic composite material injection molding |
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| CN105082388B (en) | 2018-06-01 |
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