CN105842039B - A kind of centrifugal centrifuge shield device for extracting the soil liquid - Google Patents
A kind of centrifugal centrifuge shield device for extracting the soil liquid Download PDFInfo
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- CN105842039B CN105842039B CN201610310382.7A CN201610310382A CN105842039B CN 105842039 B CN105842039 B CN 105842039B CN 201610310382 A CN201610310382 A CN 201610310382A CN 105842039 B CN105842039 B CN 105842039B
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- soil liquid
- soil
- centrifuge shield
- cutting ring
- centrifugal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
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Abstract
The invention discloses a kind of centrifugal centrifuge shield devices for extracting the soil liquid, including centrifuge shield and soil liquid collecting mechanism, wherein cutting ring fixed mechanism is provided on the inside of the casing of centrifuge shield, the cutting ring fixed mechanism includes cutting ring and cutting ring is fixed on to the cutting ring fixator of centrifuge shield, and the top cover for being removably disposed on the inner wall of centrifuge shield and offseting with cutting ring retainer top；Filter layer is arranged in the bottom of the centrifuge shield；The soil liquid collecting mechanism is removably attachable to the bottom of centrifuge shield, for collecting under the action of the centrifugal through the filtered soil liquid of filter layer.The present invention can filter soil particle, guarantee that the soil liquid obtained under centrifugal action fully enters soil liquid collecting mechanism, and levels of precision is high, easy to operate, practical, and structure is simple, cost is relatively low, and easy to operate；Different rotating speeds, the soil liquid under corresponding different centrifugal force, and the soil liquid of different water suction forces can be effectively collected in.
Description
Technical field
The present invention relates to a kind of centrifugal centrifuge shield devices for extracting the soil liquid, belong to the technology neck of centrifugation apparatus
Domain.
Background technique
The soil liquid is the general name of soil moisture and its contained solute, mainly comprising inorganic ions, organic ion and poly-
Close ion and their salt.The soil liquid and solid fraction are in close contact, and keep dynamic balance state with solid phase surface,
It, which is formed, changes with activity with the variation of external environment.The property of the soil liquid can direct shadow by the variation of soil constituent
The growth and development to crop and edaphon is rung, also will affect the effective use of soil fertility, and then influence plant growth.
When carrying out the research in terms of transition process of the soil pollutant in the soil liquid, it is often necessary to do the soil liquid and
The separation test of solid phase of soil substance, because the soil liquid concentrated expression composition and its living features of soil constituent, passes through
Research to soil liquid ingredient, under available soil liquid difference existence form at being grouped as and pollution condition, just
In the deep layer mechanism study for carrying out pollution of area source.It is little that traditional soil liquid extracting method can only extract water suction force in soil
Free water, the soil liquid single property of extraction can not further investigate contaminant transportation situation, ask there are biggish
Topic.And the soil liquid collection device having been developed that at present cannot achieve the soil liquid and corresponding soil layer is one-to-one
The soil liquid sample of collection process, acquisition easily loses.In view of the foregoing, there is presently no a kind of easy to operate, results can
The soil liquid extraction element leaned on.
Summary of the invention
Technical problem to be solved by the present invention lies in overcome the deficiencies of the prior art and provide a kind of centrifugal extraction soil
It is not high, extraction to solve the soil liquid accuracy that existing soil liquid extraction element extracts for the centrifuge shield device of solution
Soil liquid single property cannot achieve the problem of soil liquid is collected correspondingly with corresponding soil layer.
The present invention specifically uses following technical scheme to solve above-mentioned technical problem:
A kind of centrifugal centrifuge shield device for extracting the soil liquid, including centrifuge shield and soil liquid collecting mechanism,
It wherein is provided with cutting ring fixed mechanism on the inside of the casing of centrifuge shield, the cutting ring fixed mechanism includes cutting ring and fixes cutting ring
In the cutting ring fixator of centrifuge shield, and it is removably disposed on the inner wall of centrifuge shield and offsets with cutting ring retainer top
Top cover；Filter layer is arranged in the bottom of the centrifuge shield；The soil liquid collecting mechanism is removably attachable to concentrator bowl
The bottom of pipe, for collecting under the action of the centrifugal through the filtered soil liquid of filter layer.
Further, as a preferred technical solution of the present invention: the first pressure of bottom setting of the cutting ring fixator
Contracting rubber pad.
Further, as a preferred technical solution of the present invention: the filter layer is made of metal material.
Further, as a preferred technical solution of the present invention: be arranged in the filter layer at least one layer of filter cloth and
Microporous filter screen.
Further, as a preferred technical solution of the present invention: the filter cloth includes 747 filter cloth of terylene and polypropylene
Monofilament filter cloth.
Further, as a preferred technical solution of the present invention: the soil liquid collecting mechanism uses screw thread side
Formula is fixedly connected on the bottom of centrifuge shield.
Further, as a preferred technical solution of the present invention: the soil liquid collecting mechanism includes V-arrangement water outlet
Device, soil liquid collector and installation sleeve, wherein V-arrangement water outlet device is fixed on the bottom of centrifuge shield；The soil liquid is received
The top side detachable of storage it is connected to the water outlet of V-arrangement water outlet device；The installation sleeve sets soil liquid collector cover
It is interior, and it is removably attachable to centrifuge shield bottom.
Further, as a preferred technical solution of the present invention: the soil liquid collecting mechanism further includes setting
In the soil collector fixing piece in installation sleeve.
Further, as a preferred technical solution of the present invention: the top of the soil liquid collector goes out with V-arrangement
The second compressing rubber pad is arranged in the water outlet link position of hydrophone.
Further, as a preferred technical solution of the present invention: setting adds on the sleeve outer wall of the centrifuge shield
Gu Qu.
The present invention by adopting the above technical scheme, can have the following technical effects:
The centrifugal centrifuge shield device for extracting the soil liquid provided by the invention, is fixed by the cutting ring in centrifuge shield
Original-state soil in cutting ring can directly be carried out the separation of the soil liquid and soil particle, ensure that soil texture not by mechanism
It is destroyed, to improve the precision of measurement；And using the filter layer of centrifuge shield bottom, soil effectively can be intercepted and filtered
Particle, and the soil liquid is made to enter soil liquid collecting mechanism by centrifugal action；Soil liquid collecting mechanism overcomes tradition
It is molten to guarantee that the soil liquid obtained under centrifugal action fully enters soil for the shortcomings that soil liquid cannot be collected in centrifuge work
Liquid collecting mechanism.
Size design of the centrifugal centrifuge shield device for extracting the soil liquid of the present invention according to centrifuge horizontal rotor, essence
True degree is high, easy to operate, practical, and structure is simple, cost is relatively low, and easy to operate；It can be collected into difference respectively
Revolving speed corresponds to the soil liquid under different centrifugal force, and the soil liquid of different water suction forces is convenient for the later period to its property Quality Research, to grind
The influence for studying carefully migration of the soil liquid to pollution of area source provides technical conditions.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the centrifugal centrifuge shield device for extracting the soil liquid of the present invention.
Fig. 2 is the diagrammatic cross-section of the centrifugal centrifuge shield device for extracting the soil liquid of the present invention.
Fig. 3 is the partial enlargement diagram of filter layer in the present invention.
Fig. 4 is the structural schematic diagram of soil liquid collector in the present invention.
Fig. 5 is the structural schematic diagram of installation sleeve in the present invention.
Fig. 6 is the structural schematic diagram that the present invention is used for centrifuge horizontal rotor.
Wherein Symbol explanation: 1- centrifuge shield；2- soil liquid collecting mechanism；3- cutting ring fixed mechanism；4- filter layer；5-
Cutting ring；6- cutting ring fixator；7- top cover；8- the first compressing rubber pad；747 filter cloth of 9- terylene；10- polypropylene monofilament filter cloth；11-
Metal micro-holes filter screen；12-V shape water outlet device；13- soil liquid collector；14- installation sleeve；15- the second compressing rubber pad；
16- collector fixing piece；The stabilization zone 17-.
Specific embodiment
With reference to the accompanying drawings of the specification, embodiments of the present invention are described.
As shown in Figure 1, the present invention devises a kind of centrifugal centrifuge shield device for extracting the soil liquid, including concentrator bowl
Cutting ring fixed mechanism 3 is wherein arranged in pipe 1 and soil liquid collecting mechanism 2 on the inside of centrifuge shield 1；The device is able to solve existing
Technology soil liquid extracting method accuracy is high, extracts soil liquid single property cannot achieve the soil liquid and corresponding
Soil layer the problems such as collecting correspondingly.
Wherein, the cutting ring fixed mechanism is as shown in Fig. 2, include cutting ring 5 and cutting ring 5 being fixed on the inside of centrifuge shield
Cutting ring fixator 6, and be removably disposed on the inner wall of centrifuge shield and with the top cover 7 that offsets at the top of cutting ring fixator 6,
It is mainly used for preventing cutting ring 5 from sliding up and down in centrifugal process；Filter layer 4 is arranged in the bottom of the centrifuge shield 1, for blocking
It cuts and filters soil particle and the soil liquid is made to enter soil liquid collecting mechanism by centrifugal action；The soil liquid is collected
Mechanism 2 is removably attachable to the bottom of centrifuge shield 1, molten through the filtered soil of filter layer under the action of the centrifugal for collecting
Liquid.
The embodiment of the present invention is installed on cutting ring fixator 6 during the test, by the cutting ring 5 for having taken undisturbed soil from soil
On, it is removably disposed the top cover 7 for preventing cutting ring from sliding up and down in the top position of cutting ring fixator 6, it is described detachable
It is preferred that connecting using spiral way, fixed and disassembly can be realized for greater flexibility using engagement thread, as shown in Fig. 2, in cutting ring
6 top edge of fixator is carved with screw thread, and 7 side of top cover is provided with mutually chimeric screw thread, and top cover 7 can be from cutting ring fixator 6
Top edge screws in cutting ring fixator 6 to fix cutting ring 5, and the side of top cover 7 is equipped with screw thread and cutting ring retainer top inner side edge
The screw thread of edge is mutually fitted into, and allows to screw in cutting ring fixator to fix cutting ring.The position of cutting ring fixator 6 is screwed in also in top cover 7
Settable compressing rubber pad.Further, the cutting ring fixator 6 can be made of stainless steel material, bottom and 5 blade of cutting ring
The bottom position of contact is equipped with the first compressing rubber pad 8, to increase the friction of the two.
In the present apparatus, filter layer 4 is arranged in the bottom of centrifuge shield 1, it is preferable that the filter layer uses metal material system
At having intensity big, the advantages that anti-pressure ability is strong, acid-fast alkali-proof.Further, at least one layer of filter cloth is set in the filter layer
And microporous filter screen, it overlaps to be formed by multiple filtration material, so that filter layer particle entrapment is good, filter effect is good.In order to
Obtain the higher filtrate of ratio of precision, filtering layer structure that the present embodiment provides as shown in figure 3, filter layer 4 by three layer filtration material
It is formed by stacking, the sequence fallen down from above are as follows: 747 filter cloth 9 of terylene, polypropylene monofilament filter cloth 10 and metal micro-holes filter screen 11；It is logical
Three layer filtration material collective effect is crossed, filter efficiency is improved, and since device itself is detachable, filter layer 4 is easy to clean,
Overall work amount is reduced.
Three layer filtration material included by filter layer 4: 747 filter cloth 9 of terylene, polypropylene monofilament filter cloth 10 and metal micro-holes mistake
Strainer 11 needs to stress, referring to Fig. 3, the particle entrapment of 747 filter cloth 9 of terylene is good, poor air permeability, high temperature resistant, by force
Acid, strong alkali environment are able to bear the huge centrifugal force effect of centrifuge generation, and intensity is big, and the service life is long, is suitble to do centrifuge filtering
Material；Correspondingly, polypropylene monofilament filter cloth 10 has and is not easy to plug, and regenerability is good, and retention precision is high, and polypropylene monofilament
Filter cloth 10 has support and separating layer in itself, has unique performance, while being conducive to filtrate transverse shifting, the liquid with centrifuge
The direction of motion matches, and is suitble to do the filtering material of centrifuge；Metal micro-holes filter screen 11 is used as the last layer filtering material, by
The advantages that hard steel is made, and has intensity bigger, and anti-pressure ability is strong, acid-fast alkali-proof, further plays support and stabilization, and
And soil particle is not easy to plug micropore, filter efficiency significantly improves.And the present invention is preferably by 747 filter cloth 9 of terylene, polypropylene list
The aperture of silk filter cloth 10 and metal micro-holes filter screen 11 successively from as low as longer spread, further increases filter effect, but the present invention
It is not limited to this kind of mode.
Innovation of the invention is using soil liquid collecting mechanism 2, the soil come out from 4 centrifugal action of filter layer
Earth solution is collected.The soil liquid collecting mechanism, structure is as shown in Fig. 2, include V-arrangement water outlet device 12, soil liquid collection
Device 13 and installation sleeve 14, wherein V-arrangement water outlet device 12 is fixed on the bottom of centrifuge shield 1, accepts the soil obtained by filter layer 4
Earth solution, so that 12 top of V-arrangement water outlet device in cutting ring fixed mechanism, plays the role of assisting water outlet；The soil liquid is received
The top side detachable of storage 13 it is connected to the water outlet of V-arrangement water outlet device 12；The installation sleeve 14 is by soil liquid collector
Including 13 covers are set, and it is removably attachable to 1 bottom of centrifuge shield.Under a certain revolving speed of centrifuge, this corresponding revolving speed
Centrifugal force overcomes correspondingly soil water suction, so that having extracted the part soil liquid in centrifuge shield 1, and through filter layer
Feeding soil liquid collector 13 is collected separately after 4.
In addition, the present apparatus preferably uses engagement thread that soil liquid collector 13 is fixed on to the water outlet of V-arrangement water outlet device 12
Mouthful, and installation sleeve 14 is connected to by 1 bottom of centrifuge shield using engagement thread, stable and jail may be implemented using engagement thread
Admittedly connect, and improve obturation effect.Specifically, as shown in figure 4, soil liquid collector 13 is in inverted funnel shape, top bottleneck
The screw thread mutually chimeric with radial centrifuge is carved in part, and is carved with screw thread, the soil liquid in the lower part water outlet of V-arrangement water outlet device
The bottleneck of collector 13 can screw in from lower to upper from the lower part water outlet edge of V-arrangement water outlet device, and the soil liquid of taper is collected
The soil liquid that device makes is stored in taper side, prevents liquid reflux；The bottleneck top of the soil liquid collector 13
The second compressing rubber pad 15 is arranged in the water outlet link position of edge and V-arrangement water outlet device, for closing soil liquid receiving flask and V
Shape water outlet device.And the structure of the installation sleeve 14, as shown in figure 5, the inside top edge of installation sleeve 14 is carved with screw thread,
Correspondingly, the bottom of centrifuge shield 1 is also provided with screw thread, and realization safety sleeve 14 is flexibly connected with centrifuge shield 1.At two
Screw thread is mutually fitted into, and safety sleeve 14 is screwed off from centrifuge shield 1 and soil liquid collector 13 can be discharged from V-arrangement
Device screws off, and realization while isolated state keep entire centrifuge shield device simple to operation.And it is closed in order to be better achieved
Property, also the top border of safety sleeve 14 can be provided with compressing rubber pad, so that it, when connecting centrifuge shield 1, is improved close
Closing property.
Further include the soil collector fixing piece 16 being set in installation sleeve in the soil liquid collecting mechanism, such as schemes
Shown in 5, soil liquid collector 13 can be fixed in installation sleeve 14 by collector fixing piece 16, can also be released solid
It is fixed, so that the soil liquid that will be collected into be facilitated to pour.Under certain centrifugal force effect, correspondingly the soil liquid is collected
Process losses are small, and soil liquid collector 13 makes the soil liquid being centrifuged out be stored in conical section, prevent the soil liquid from flowing back
And it redirects.Preferably, in the also settable compressing rubber pad in the top of collector fixing piece 16, made using compressing rubber pad
It obtains it and increases the friction with soil liquid collector 13, improve the stationarity and stability of connection.
The present apparatus is when in soil high speed freezing centrifuge, it is preferable that is arranged on the sleeve outer wall of centrifuge shield
Stabilization zone 17, as shown in fig. 6, the stabilization zone 17 can be symmetrically disposed on position of the outer wall two sides close to top edge of centrifuge shield
It sets, convenient for the fixation of soil high speed freezing centrifuge, further increases fixed effect, realize more firm placement.
For a better understanding of the present invention, below to the centrifuge shield device of the centrifugal extraction soil liquid of the invention
The course of work is illustrated:
(1) pedotheque is taken out with cutting ring 5, after having cleared up cutting ring external dirt, cutting ring 5 is fitted into cutting ring fixator 6,
And top cover 7 is screwed in cutting ring fixator 6.Check whether soil liquid collector 13 is connected intact with installation sleeve 14 respectively, most
After check whether all mechanisms are connected appropriate, be connected it is appropriate after enter centrifugation process.
(2) stabilization zone 17 of mounted centrifuge shield outer wall is fixed on centrifuge horizontal rotor, likewise, separately
Take other three positions for being fixed on rotor according to identical step equipped with pedotheque cutting ring that three quality are equal.
(3) after installing horizontal rotor, centrifugation machine cap is closed, setting temperature is the temperature of local soil, and setting is just
Beginning revolving speed, i.e. minimum speed, centrifugation time 15 to 30min close centrifuge, take out centrifuge shield device, the soil liquid is received
Collecting mechanism 2 disassembles, removing through the filtered soil liquid collector 13 of filter layer 4 and by soil from installation sleeve 14
Solution is poured out.
(4) it repeats step 1 and 2 to increase speed in operating procedure 3, increases centrifugal force, other are as step 3.
In this way, available difference centrifugal rotational speed, the soil liquid under corresponding different centrifugal force effects collects sample.
To sum up, the present invention uses centrifugal extraction soil liquid mode, ensure that soil texture is not destroyed, to improve
The precision of measurement；Soil particle effectively can be intercepted and be filtered, and the soil liquid is made to enter the soil liquid by centrifugal action
Collecting mechanism；The shortcomings that soil liquid cannot be collected in conventional centrifuge work is overcome, guarantees the soil obtained under centrifugal action
Earth solution fully enters soil liquid collecting mechanism；Extract levels of precision it is high, easy to operate, practical, structure simply, cost
It is lower and easy to operate；It can be collected into different rotating speeds respectively, the soil liquid under corresponding different centrifugal force can be effective
In the soil liquid extraction process of different water suction forces.
Embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode within the knowledge of a person skilled in the art can also be without departing from the purpose of the present invention
It makes a variety of changes.
Claims (9)
1. a kind of centrifugal centrifuge shield device for extracting the soil liquid, it is characterised in that: including centrifuge shield and the soil liquid
Collecting mechanism, is provided with cutting ring fixed mechanism on the inside of the casing of wherein centrifuge shield, the cutting ring fixed mechanism include cutting ring and
Cutting ring is fixed on to the cutting ring fixator of centrifuge shield, and is removably disposed on the inner wall of centrifuge shield and is fixed with cutting ring
The top cover to offset at the top of device；Filter layer is arranged in the bottom of the centrifuge shield；The soil liquid collecting mechanism removably connects
It is connected to the bottom of centrifuge shield, for collecting under the action of the centrifugal through the filtered soil liquid of filter layer；Wherein, the soil
Solution collecting mechanism includes V-arrangement water outlet device, the soil liquid collector of taper and installation sleeve, and wherein V-arrangement water outlet device is fixed on
The bottom of centrifuge shield；The top side detachable of the soil liquid collector it is connected to the water outlet of V-arrangement water outlet device；The peace
It is sleeved soil liquid collector cover is set including, and be removably attachable to centrifuge shield bottom.
2. the centrifugal centrifuge shield device for extracting the soil liquid according to claim 1, it is characterised in that: the cutting ring is solid
The bottom for determining device is provided with the first compressing rubber pad.
3. the centrifugal centrifuge shield device for extracting the soil liquid according to claim 1, it is characterised in that: the filter layer
It is made of metal material.
4. the centrifugal centrifuge shield device for extracting the soil liquid according to claim 1, it is characterised in that: the filter layer
At least one layer of filter cloth of interior setting and microporous filter screen.
5. the centrifugal centrifuge shield device for extracting the soil liquid according to claim 4, it is characterised in that: the filter cloth packet
Include 747 filter cloth of terylene and polypropylene monofilament filter cloth.
6. the centrifugal centrifuge shield device for extracting the soil liquid according to claim 1, it is characterised in that: the soil is molten
Liquid collecting mechanism is fixedly connected on the bottom of centrifuge shield using engagement thread.
7. the centrifugal centrifuge shield device for extracting the soil liquid according to claim 1, it is characterised in that: the soil is molten
Liquid collecting mechanism further includes the soil liquid collector fixing piece being set in installation sleeve.
8. the centrifugal centrifuge shield device for extracting the soil liquid according to claim 1, it is characterised in that: the soil is molten
The second compressing rubber pad is arranged in the top of collection and the water outlet link position of V-arrangement water outlet device.
9. the centrifugal centrifuge shield device for extracting the soil liquid according to claim 1, it is characterised in that: the concentrator bowl
Stabilization zone is set on the sleeve outer wall of pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610310382.7A CN105842039B (en) | 2016-05-12 | 2016-05-12 | A kind of centrifugal centrifuge shield device for extracting the soil liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610310382.7A CN105842039B (en) | 2016-05-12 | 2016-05-12 | A kind of centrifugal centrifuge shield device for extracting the soil liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105842039A CN105842039A (en) | 2016-08-10 |
| CN105842039B true CN105842039B (en) | 2018-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610310382.7A Expired - Fee Related CN105842039B (en) | 2016-05-12 | 2016-05-12 | A kind of centrifugal centrifuge shield device for extracting the soil liquid |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106482986A (en) * | 2016-11-16 | 2017-03-08 | 江苏智石科技有限公司 | A kind of soil liquid extraction element based on filtration |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1058551A (en) * | 1990-08-03 | 1992-02-12 | 让·吉根 | Device with blood plasma in the centrifugal separation separating whole blood |
| CN204027900U (en) * | 2014-09-09 | 2014-12-17 | 石河子大学 | A kind of Combined centrifuge tube for extracting soil stoste |
| CN204439487U (en) * | 2015-03-13 | 2015-07-01 | 西北农林科技大学 | A kind of system utilizing centrifuge method to measure characteristic curve of soil moisture |
| CN204503132U (en) * | 2015-02-09 | 2015-07-29 | 陕西科技大学 | A kind of filtering type centrifuge tube |
| CN205786029U (en) * | 2016-05-12 | 2016-12-07 | 河海大学 | A kind of centrifuge shield device of the centrifugal extraction soil liquid |
-
2016
- 2016-05-12 CN CN201610310382.7A patent/CN105842039B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1058551A (en) * | 1990-08-03 | 1992-02-12 | 让·吉根 | Device with blood plasma in the centrifugal separation separating whole blood |
| CN204027900U (en) * | 2014-09-09 | 2014-12-17 | 石河子大学 | A kind of Combined centrifuge tube for extracting soil stoste |
| CN204503132U (en) * | 2015-02-09 | 2015-07-29 | 陕西科技大学 | A kind of filtering type centrifuge tube |
| CN204439487U (en) * | 2015-03-13 | 2015-07-01 | 西北农林科技大学 | A kind of system utilizing centrifuge method to measure characteristic curve of soil moisture |
| CN205786029U (en) * | 2016-05-12 | 2016-12-07 | 河海大学 | A kind of centrifuge shield device of the centrifugal extraction soil liquid |
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| CN105842039A (en) | 2016-08-10 |
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Granted publication date: 20181218 Termination date: 20210512 |