CN104913959B - High leakproofness sample preparation device and its method for making sample - Google Patents
High leakproofness sample preparation device and its method for making sample Download PDFInfo
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- CN104913959B CN104913959B CN201510314656.5A CN201510314656A CN104913959B CN 104913959 B CN104913959 B CN 104913959B CN 201510314656 A CN201510314656 A CN 201510314656A CN 104913959 B CN104913959 B CN 104913959B
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Abstract
The present invention discloses a kind of high leakproofness sample preparation device, including base, more valve arc shaped tile moulds, top cap, hit real guide rod and screens device, each arc shaped tile mould docking encirclement forms cylinder, cylinder is socketed on base boss, top cap is arranged at cylinder top, lining rubber membrane on the inside of cylinder, aspirating hole is carried on arc shaped tile mould, aspirating hole configures rubber pipette bulb, rubber membrane is socketed on the boss of base and is tightened, real lower end of the guide rod is hit to tap the head with circle, hit real guide rod and be provided with clamp, screens device is made up of two valve semicircular plates, two valve semicircular plate centers are provided with circular socket holes, hit on real guide rod and be cased with compaction hammer, base is provided with permeable stone, cylinder is surrounded into confined space with rubber membrane, interior pressure passageway is opened up on base and top cap, the inner chamber that interior pressure passageway surrounds with rubber membrane turns on.Sample made of the device evenly, size strictly meet the requirements, more convenient operation, the compactness of easily controllable sample.The present invention also provides a kind of method using high leakproofness sample preparation device sample preparation.
Description
Technical field
The present invention relates to a kind of high leakproofness sample preparation device, the sample preparation device belongs to indoor soil mechanics testing equipment, especially
It is related to the preparation of the granular material sample such as sand, silt.The invention further relates to one kind to use above-mentioned high leakproofness sample preparation device
The method of sample preparation.
Background technology
At present in indoor soil mechanics cell cube experiment, prepared by sample is the key link tested successfully, for triaxial apparatus, altogether
The conventional test apparatus of the post etc. that shakes, need to often prepare cylindrical sample, and the control of the dimensional standard degree of sample, relative compaction and
Uniformity has very important influence for result of the test.The rubber membrane that in test sample preparation uses is needed by rigid die
Support load sample, therefore during sample preparation, rubber membrane is adjacent to rigid die just aobvious particularly necessary.
In traditional sampling die, two petals tool contact position be metal parallel contact, sealing is poor, rubber membrane and
Hole between sampling die be present, obtained sample cross size is nonstandard, so that Control Assay that can not be strict is relatively close
The preparation of solidity, especially discrete particles shape material sample, error are bigger.In order to reach preferable sample preparation effect, typically adopted
The measure taken is to set an aspirating hole in rigid sampling die centre position, when sample preparation, aspirating hole is connected to outer
In the continuous negative pressure system that boundary provides, make lasting negative pressure between rubber membrane and rigid sampling die be present, to reach rubber membrane
The purpose being adjacent to rigid sampling die.Lasting negative pressure needs the adjustable negative pressure system of size, avoids dashing forward because of larger negative pressure
So apply and cause rubber membrane damaged.
The uniformity of sample is had a great influence further, since traditional sample prepares manual operation, made from different personnel
Sample is not quite similar, and the repeatability of result of the test has higher dependence to the qualification of testing crew.
In summary, the sand sampling die generally existing air-tightness deficiency being currently known, it is necessary to by continuous negative pressure system
The shortcomings that system can just prepare ideal sample.And sample uniformity and result of the test repeatability have to testing crew it is higher
Dependence.
The content of the invention
The shortcomings that existing for above-mentioned prior art, present invention offer technical problem to be solved are to provide a kind of highly dense
Envelope property sample preparation device, sample made of the device is more uniform, size can strictly meet the requirements, and operates and more facilitate,
The relative compaction of Control Assay can be more prone to.The technical problems to be solved by the invention also include providing one kind using upper
The method for stating high leakproofness sample preparation device sample preparation.
To achieve the above object, the technical solution adopted by the present invention is：High leakproofness sample preparation device, including base, more valves
Arc shaped tile mould, top cap, real guide rod and screens device are hit, arc shaped tile mould described in more valves docks and surrounds to form cylinder, cylindrical sleeve
It is connected on the boss of base, the top cap is arranged at cylinder top, is lined with rubber membrane on the inside of cylinder, rubber membrane upper end outwards turns down
And be enclosed on cylinder lateral wall, the arc shaped tile mould joint hermetic seal, aspirating hole is carried on the arc shaped tile mould, it is described
Rubber membrane lower end is socketed on the boss of base and by the first sealing ring banding, described to hit real lower end of the guide rod and carry and cylinder section
The circle of matching is tapped the head, and the circle for hitting real guide rod arrangement above of tapping the head has clamp, and the screens device is by two valve semicircular plates
Form, the diameter of two valve semicircular plates is more than the diameter of cylinder upper end outlet, and the two valves semicircular plate center offers and can worn
Cross and hit the local circular socket holes of real guide rod, it is described to hit on real guide rod, be socketed with compaction hammer above clamp, on the base, rubber
Permeable stone is provided with epithelium, the cylinder is surrounded to form confined space, offered in the base and top cap with rubber membrane
The interior pressure passageway of lateral openings, the inner chamber that interior pressure passageway surrounds with rubber membrane turn on.
Present invention also offers comprised the following steps using the method for above-mentioned high leakproofness sample preparation device sample preparation：
（1）The air-tightness of rubber membrane is checked, intact rubber membrane is enclosed on the boss of base and uses the first sealing ring
Banding, height and position where the first sealing ring are aligned with the sealing ring groove position of each arc shaped tile mold bottom；
（2）The first sealing ring on base has been bound round into the sealing ring neck alignment of each arc shaped tile mold bottom, slowly used
Hand pressure is next, puts hose clamp and locks, and each arc shaped tile mould is mutually butted to form cylinder, and vertical projections, which are caught in, during docking is embedded with
Hermetic seal is formed in the vertical neck of rubber gasket, so that sampling die bottom and side form hermetic seal；
（3）The rubber membrane on top is overturn from inside to outside and is enclosed on sampling die top peripheral, adjustment rubber membrane makes it flat
It is whole, form closing space between rubber membrane and arc shaped tile mould；
（4）It is evacuated using rubber pipette bulb from the aspirating hole of arc shaped tile mould, rubber membrane is attached on arc shaped tile mould；
（5）The permeable stone and filter paper of sample bottom are put into rubber membrane in order；
（6）According to the relative compaction of plan filling, required particulate material mass is calculated, after weighing, by sample material
Material is divided into several pieces, is loaded sample material portionwise with funnel；
（7）First part of sample material is poured into rubber membrane and shakeouts sample material top surface, screens device is stuck in and hits reality
After the screens groove of guide rod the top, vertical is put into sampling die inner chamber, lifts compaction hammer, repeatedly touch, it was observed that screens device
Be in close contact sampling die top along when, proposition hit real guide rod；
（8）Repeat step（7）Sample material by second part of sample material and afterwards loads in rubber membrane and hits reality；
（9）The filter paper and permeable stone being put into order in rubber membrane at the top of sample, installation sample top cap make its smooth, turned over
Turn the rubber membrane on cylinder top, make its smooth parcel top cap, by sealing ring banding on the rubber membrane of top cap；
（10）The water flowing valve closed in base and top cap, make pressure passageway in its closing, only stay a water flowing valve to be not related to
Close and use as inhaling negative pressure, inhale negative pressure with rubber pipette bulb, negative pressure pressure closes valve in -15kpa or so afterwards；
（11）Hose clamp is removed, carefully pulls down sampling die, sample preparation is completed.
The beneficial effects of the invention are as follows：1st, because rubber membrane top is turned up and the cylinder formed in arc shaped tile mould that is locked
On, and the bottom of rubber membrane makes rubber membrane and arc using the gap between the first sealing ring sealing arc shaped tile mould and rubber membrane
It can just make easily within rubber membrane when confined space is formed between shape watt mould structure, therefore being evacuated using rubber pipette bulb from aspirating hole
With formation pressure difference on the outside of rubber membrane, promote rubber membrane to be adjacent on arc shaped tile mould, now directly adsorb in pumping with rubber pipette bulb
No longer removed at hole and during experiment, you can make to keep negative pressure for a long time between rubber membrane and arc shaped tile mould, when can be long
Between keep rubber membrane be adjacent to arc shaped tile mould, overcoming in traditional sample making course needs to be equipped with negative pressure system at any time to ensure rubber
The smooth deficiency of film；2nd, hitting real guide rod and can more easily make the sample of high-precision size with screens, it is easy to experiment to grasp
The accurate Control Assay relative compaction of author and uniformity, greatly improve the repeatability of sample preparation efficiency and result of the test；
3rd, sample preparation operation principle is simple, easy to operate, and cost is relatively low, has good application value.
Brief description of the drawings
The present invention is further described with implementation below in conjunction with the accompanying drawings.
Fig. 1 is the structure schematic cross-sectional view of high leakproofness sample preparation device provided by the invention.
Fig. 2 is the medial surface schematic diagram of the arc shaped tile mould in Fig. 1.
Fig. 3 is the top end view of the arc shaped tile mould in Fig. 1 in Fig. 1.
Fig. 4 is the bottom end view of the arc shaped tile mould in Fig. 1 in Fig. 1.
Fig. 5 is the structural representation figure of the screens device in Fig. 1.
Fig. 6 is the structural representation for hitting real guide rod in Fig. 1.
Fig. 7 is schematic diagram of the high leakproofness sample preparation device in the case where loading sample state in Fig. 1.
Fig. 8 is that the high leakproofness sample preparation device in Fig. 1 configures the schematic diagram prolonged under mould tubular state.
Fig. 9 is that the high leakproofness sample preparation device in Fig. 1 lays the schematic diagram after top cap.
In figure：1. vertical neck, 2. grooves, 4. sealing ring necks, 5. dead slots, 6. aspirating holes, 7. vertical projections, 8. bottoms
Seat, 9. rubber pipette bulbs, 10. first sealing rings, 11. permeable stones, 12. screens devices, 13. hit real guide rod, 14. compaction hammers, 15. screens
Groove, 18. funnels, 19. prolong mould cylinder, pressure passageway in 20., 21. top caps, and 22, arc shaped tile mould, 23, cylinder, 24, boss, 25, rubber
Epithelium, the 26, second sealing ring, 27, clamp.
Embodiment
Shown in reference picture 1- Fig. 9, high leakproofness sample preparation device provided by the invention, including base 8, more valve arc shaped tile moulds
22nd, top cap 21, hit real guide rod 13 and screens device 12, the two side ends that the arc shaped tile mould 22 has be respectively provided with vertical neck 1 and with
The vertical projections 7 that vertical neck 1 matches, rubber gasket are embedded with vertical neck 1, adjacent arc shaped tile mould 22 erects after docking
It is caught in projection 7 in vertical neck 1 and forms hermetic seal, arc shaped tile mould described in more valves, 22 docks and surround to form cylinder 23, cylinder
23 are socketed on the boss 24 of base 8, and the top cap 21 is arranged at the top of cylinder 23, and the inner side of cylinder 23 is lined with rubber membrane 25, rubber
The upper end of epithelium 25 outwards turns down and is enclosed on the lateral wall of cylinder 23, the joint hermetic seal of arc shaped tile mould 22, the arc
Aspirating hole 6 is carried on watt mould 22, is inserted at aspirating hole 6 and is adsorbed with rubber pipette bulb 9, the lower end of rubber membrane 25 is socketed in base
It is on 8 boss 24 and by the banding of the first sealing ring 10, the concrete structure of the banding of the first sealing ring 10：The inner side of arc shaped tile mould 22
The part of base 8 is provided with sealing ring neck 4, the first sealing ring 10 of the bottom of 4 clamping rubber membrane of sealing ring neck 25,
It is exactly that sealing ring neck 4 is bonded with being enclosed on the first sealing ring 10 compression of the bottom of rubber membrane 25, the depth of sealing ring neck 4 should compare
The diameter of first sealing ring 10 is small by 25%, so that sealing ring neck 4 can either block the first sealing ring 10, makes the first sealing again
Circle 10 can protrude compress rubber film 25, and the first sealing ring 10 of rubber gasket and bottom in vertical neck 1 should have part
It is overlapping, to ensure the part air-tightness of vertical splicing seams and the first sealing ring 10 boundary.It is described hit the real lower end of guide rod 13 carry with
The circle of the cross-sections match of cylinder 23 is tapped the head, and circle is tapped the head with air-vent, and the circle for hitting real guide rod 13 is tapped the head arrangement above
There is clamp 27, screens device 12 is made up of two valve semicircular plates, and the diameter of two valve semicircular plates is more than the diameter of cylinder upper end outlet,
The two valves semicircular plate center, which offers may pass through, hits the local circular socket holes of real guide rod 13, described to hit on real guide rod 13, block
The top of plate 27 is socketed with compaction hammer 14, and on the base 8, permeable stone 11, the cylinder 23 and rubber are provided with rubber membrane 25
Epithelium 25 surrounds and forms confined space, the interior pressure passageway 20 of lateral openings is offered on the base 8 and top cap 32, internal pressure is led to
The inner chamber that road 20 surrounds with rubber membrane 25 turns on.In the present embodiment, the size of arc shaped tile mould 22 is bottom 10mm height models
In enclosing, internal diameter 57mm, remainder internal diameter is 51mm, and the wall thickness in the 20mm high scopes of top is 4mm, bottom 10mm scopes
It is interior, wall thickness 6.5mm, remainder wall thickness 10mm（By specimen size：Diameter 50mm, height 100mm are designed）.
Shown in reference picture 2, on the basis of above-described embodiment, in order that the circle that rubber membrane 25 and arc shaped tile mould 22 are formed
The airflow smooth in space between cylinder 23, the inner side of arc shaped tile mould 22 are provided with the groove 2 of vertical and horizontal, at least one side arc
Shape watt mould carries the aspirating hole 6 communicated with groove 2.
Shown in reference picture 1, Fig. 2, in order to strengthen rubber membrane 25 and the air-tightness at the cooperation of boss 24 on base 8, arc
Dead slot 5 is offered below watt bottom of mould 22, the position of sealing ring neck 4, the rubber membrane 25 is extended downwardly at dead slot 5, institute
Rubber membrane 25 is stated by elastic threads banding on the boss 24 of base, elastic threads are generally rubber seal or rubber band.
The method using high leakproofness sample preparation device sample preparation that the first embodiment of the invention provides is described in detail below：
Specimen size：Exemplified by prepared by diameter 50mm, height 100mm triaxial apparatus sample, sample sand uses Feng Pusha（G s=
2.65e max=0.977,e min=0.597）, it is 40% that plan, which controls relative compaction, needs sand loading 285g.This method includes following step
Suddenly：
（1）The air-tightness of rubber membrane 25 is checked, intact rubber membrane 25 is enclosed on the boss 24 of base and using first
The banding of sealing ring 10, the place height and position of the first sealing ring 10 and the position pair of sealing ring neck 4 of each bottom of arc shaped tile mould 22
It is accurate；
（2）The sealing ring neck 4 of each bottom of arc shaped tile mould 22 is directed to the first sealing ring 10 bound round on base, slowly
Slowly it is next with hand pressure, put hose clamp and lock, each arc shaped tile mould 22 is mutually butted to form cylinder 23, vertical projections during docking
7 are caught in the vertical neck 1 embedded with rubber gasket and form hermetic seal so that sampling die bottom and side formed it is airtight
Envelope；
（3）The rubber membrane 25 on top is overturn from inside to outside and is enclosed on sampling die top peripheral, adjustment rubber membrane 25 makes
Its is smooth, and rubber membrane 25 turns up and is locked on the outside of the upper end of cylinder 23, and envelope is formed between rubber membrane 25 and arc shaped tile mould 22
Close space；
（4）It is evacuated using rubber pipette bulb 9 from the aspirating hole 6 of arc shaped tile mould 22, rubber membrane 25 is attached to arc shaped tile mould
On tool 22；
（5）The permeable stone 11 and filter paper of sample bottom are put into rubber membrane 25 in order；
（6）According to the relative compaction of plan filling, required particulate material mass is calculated, after weighing, by sample material
Material is divided into several pieces, is loaded sample material portionwise with funnel 18；
（7）First part of sample material is poured into rubber membrane 25 and shakeouts sample material top surface, screens device 12 is stuck in
After hitting the screens groove 15 of real the top of guide rod 13, vertical is put into sampling die inner chamber, lifts compaction hammer 14, repeatedly touch, sees
Observe screens device 12 be in close contact sampling die top along when, proposition hit real guide rod 13；
（8）Repeat step（7）Sample material by second part of sample material and afterwards loads in rubber membrane 25 and hits reality；
（9）The filter paper and permeable stone 11 being put into order in rubber membrane 25 at the top of sample, installation sample top cap 21 make it
It is smooth, the rubber membrane 25 on upset cylinder 23 top, make its smooth parcel top cap 21, by the banding of the second sealing ring 26 in top cap 21
On rubber membrane 25；
（10）The water flowing valve closed in base 8 and top cap 21, make pressure passageway 20 in its closing, only stay a water flowing valve
Do not close and use as inhaling negative pressure, inhale negative pressure with rubber pipette bulb, negative pressure pressure closes valve in -15kpa or so afterwards；
（11）Hose clamp is removed, carefully pulls down sampling die, sample preparation is completed.
The method and the first embodiment using high leakproofness sample preparation device sample preparation that second of embodiment of the present invention provides
Essentially identical, it is differed only in：, need to be on sampling die top before step 9 when sample material is being higher by cylinder before hitting reality
A jacketed high 20mm's prolongs mould cylinder 19, pours into last sample and gently shakeouts sample top surface, will be last using step 7
Sample compacting is tried, after reaching estimated relative compaction, real guide rod 13 and screens device 12 are hit in proposition, are removed and are prolonged mould cylinder 19.
In the above-mentioned method using high leakproofness sample preparation device sample preparation, sand sample preparation is carried out, obtained specimen size is entered
Row measurement, the upper, middle and lower diameter of sample are respectively：50.015,50.006,50.022mm, diameter average value is 50.014mm,
Symmetrical measurement height, it is respectively：100.015,99.995mm, height average 100.005mm, the diameter chi that upper, middle and lower measures
Very little difference is within 0.02mm, and symmetrical height dimension difference is within 0.02mm.The actual relative compaction of sample, which is made, is
39.5%, compactness differs less than 1% with predicted value.
Claims (10)
1. a kind of high leakproofness sample preparation device, it is characterized in that：Including base, more valve arc shaped tile moulds, top cap, hit real guide rod and card
Position device, arc shaped tile mould described in more valves are docked and surround to form cylinder, and cylinder is socketed on the boss of base, and the top cap is set
In cylinder top, rubber membrane is lined with the inside of cylinder, rubber membrane upper end outwards turns down and is enclosed on cylinder lateral wall, the arc shaped tile
Mould joint hermetic seal, aspirating hole is carried on the arc shaped tile mould, is inserted at aspirating hole and is adsorbed with rubber pipette bulb, the rubber
Epithelium lower end is socketed on the boss of base and by the first sealing ring banding, described to hit real lower end of the guide rod and carry and cylinder section
The circle matched somebody with somebody is tapped the head, and the circle for hitting real guide rod arrangement above of tapping the head has clamp, and the screens device is by two valve semicircular plate structures
Into the diameter of two valve semicircular plates is more than the diameter of cylinder upper end outlet, and the two valves semicircular plate center, which offers, may pass through
Hit the local circular socket holes of real guide rod, it is described to hit on real guide rod, be socketed with compaction hammer above clamp, on the base, rubber
Permeable stone is provided with film, the cylinder is surrounded to form confined space with rubber membrane, and side is offered in the base and top cap
To the interior pressure passageway of opening, the inner chamber that interior pressure passageway surrounds with rubber membrane turns on.
2. high leakproofness sample preparation device according to claim 1, it is characterized in that：The two side ends difference of the arc shaped tile mould
Vertical projections with vertical neck and with vertical pocket matches, rubber gasket, adjacent arc shaped tile are embedded with vertical neck
Vertical projections, which are caught in vertical neck, after mould docking forms hermetic seal.
3. high leakproofness sample preparation device according to claim 1 or 2, it is characterized in that：The arc shaped tile die inside close to
The part of base is provided with sealing ring neck, the first sealing ring of sealing ring neck clamping rubber membrane bottom.
4. high leakproofness sample preparation device according to claim 1 or 2, it is characterized in that：The arc shaped tile die inside is set
There is the groove of vertical and horizontal, at least one side arc shaped tile mould carries the aspirating hole communicated with groove.
5. high leakproofness sample preparation device according to claim 3, it is characterized in that：The arc shaped tile die inside is provided with vertical
To the groove with transverse direction, at least one side arc shaped tile mould carries the aspirating hole communicated with groove.
6. high leakproofness sample preparation device according to claim 1 or 2, it is characterized in that：The arc shaped tile die end, sealing
Dead slot is offered below circle groove position, the rubber membrane is extended downwardly at dead slot, and the rubber membrane is existed by elastic threads banding
On the boss of base.
7. high leakproofness sample preparation device according to claim 3, it is characterized in that：The arc shaped tile die end, sealing ring
Dead slot is offered below groove position, the rubber membrane is extended downwardly at dead slot, and the rubber membrane is by elastic threads banding the bottom of at
On the boss of seat.
8. high leakproofness sample preparation device according to claim 4, it is characterized in that：The arc shaped tile die end, sealing ring
Dead slot is offered below groove position, the rubber membrane is extended downwardly at dead slot, and the rubber membrane is by elastic threads banding the bottom of at
On the boss of seat.
9. a kind of method using high leakproofness sample preparation device sample preparation described in claim 1, it is characterized in that：Comprise the following steps：
（1）The air-tightness of rubber membrane is checked, intact rubber membrane is enclosed on the boss of base and uses the first sealing ring banding,
Height and position where first sealing ring is aligned with the sealing ring groove position of each arc shaped tile mold bottom；
（2）The first sealing ring on base has been bound round into the sealing ring neck alignment of each arc shaped tile mold bottom, has slowly used hand pressure
It is next, put hose clamp and lock, each arc shaped tile mould is mutually butted to form cylinder, vertical projections are caught in embedded with rubber during docking
Hermetic seal is formed in the vertical neck of sealing gasket, so that sampling die bottom and side form hermetic seal；
（3）The rubber membrane on top is overturn from inside to outside and is enclosed on sampling die top peripheral, adjustment rubber membrane makes its smooth,
Closing space is formed between rubber membrane and arc shaped tile mould；
（4）It is evacuated using rubber pipette bulb from the aspirating hole of arc shaped tile mould, rubber membrane is attached on arc shaped tile mould；
（5）The permeable stone and filter paper of sample bottom are put into rubber membrane in order；
（6）According to the relative compaction of plan filling, required particulate material mass is calculated, it is after weighing, sample material is equal
Several pieces are divided into, are loaded sample material portionwise with funnel；
（7）First part of sample material is poured into rubber membrane and shakeouts sample material top surface, screens device is stuck in and hits real guide rod
After the screens groove of the top, vertical is put into sampling die inner chamber, lifts compaction hammer, repeatedly touch, it was observed that screens device is close
Contact sampling die top along when, proposition hit real guide rod；
（8）Repeat step（7）Sample material by second part of sample material and afterwards loads in rubber membrane and hits reality；
（9）The filter paper and permeable stone being put into order in rubber membrane at the top of sample, installation sample top cap make its smooth, upset circle
The rubber membrane on cylinder top, makes its smooth parcel top cap, by sealing ring banding on the rubber membrane of top cap；
（10）The water flowing valve closed in base and top cap, make pressure passageway in its closing, only stay a water flowing valve to be not related to and close work
Used to inhale negative pressure, inhale negative pressure with rubber pipette bulb, negative pressure pressure closes valve in -15kpa or so afterwards；
（11）Hose clamp is removed, carefully pulls down sampling die, sample preparation is completed.
10. the method for high leakproofness sample preparation device sample preparation is used according to claim 9, it is characterized in that：When sample material exists
Hit before reality when being higher by cylinder, need to prolong mould cylinder in the jacketed high 20mm in sampling die top before step 9, pour into last examination
Sample simultaneously gently shakeouts sample top surface, using step 7 by last examination sample compacting, after reaching estimated relative compaction, proposes to hit
Real guide rod and screens device, remove and prolong mould cylinder.
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| CN201716256U (en) * | 2010-07-14 | 2011-01-19 | 中原工学院 | Soil mass permeability testing device |
| CN103389249A (en) * | 2013-07-18 | 2013-11-13 | 河海大学 | Device and method for clay core wall hydraulic fracturing experiments |
| CN104634636A (en) * | 2015-02-16 | 2015-05-20 | 河海大学 | Remolded soil layered sample impacting device and sample preparation method thereof |
| CN204758367U (en) * | 2015-06-10 | 2015-11-11 | 温州大学 | High leakproofness system appearance device |
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| CN104913959A (en) | 2015-09-16 |
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