CN108971209A - A kind of soil remediation improvement device - Google Patents
A kind of soil remediation improvement device Download PDFInfo
- Publication number
- CN108971209A CN108971209A CN201810691717.3A CN201810691717A CN108971209A CN 108971209 A CN108971209 A CN 108971209A CN 201810691717 A CN201810691717 A CN 201810691717A CN 108971209 A CN108971209 A CN 108971209A
- Authority
- CN
- China
- Prior art keywords
- fixing seat
- crushing
- box
- treatment
- stock guide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Crushing And Pulverization Processes (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The invention discloses a kind of soil remediations to improve device, including treatment box, the middle inside of the treatment box is equipped with fixing seat, the external circumferential of fixing seat is equipped with multiple stock guides, the lower middle side part of each stock guide is equipped with medicament outlet pipe, the inner end of medicament outlet pipe extends at fixing seat and is connected to chamber connection with the annular opened up on the inside of fixing seat, multiple spray heads are installed on the downside of medicament outlet pipe, crushing shaft is equipped between adjacent stock guide, the second driving motor for being equipped on the outside for the treatment of box and crushing axis connection, multiple crushing knifes are installed on crushing shaft, the lower part of fixing seat is circumferentially equipped with more hounds, multiple columns matched with crushing knife are installed at the top of hound, the bottom of fixing seat is equipped with the first driving motor, the lower end of agitating shaft is equipped with paddle.Blanking of the present invention control is simple and convenient, good crushing effect, high-efficient, and medicament good mixing effect improves the repairing quality of soil, is conducive to promote.
Description
Technical field
The present invention relates to technical field of soil remediation, specifically a kind of soil remediation improves device.
Background technique
After chemical pollution (such as petroleum) soil, chemical materials can be penetrated into soil rapidly, kill micro- life in soil
Object changes earth's surface ecology to change soil constituent, may be within the decades even upper century-old time by contaminated area
Not even a blade of grass grows in capital.And chemical materials also pollutes ocean, rivers and lakes, underground water etc..Many studies have shown that: it is some
After chemical materials enters in animal body, there are carcinogenic, teratogenesis, mutagenic effect to mammal and the mankind.And soil is tight
Certain ingredients that heavily contaminated will lead to chemical materials accumulate in grain, influence the quality of grain, and by food chain, endanger people
Class health.
It during existing soil remediation, needs first to smash soil, then by spray appliance in its surface flushing liquor
Body medicament needs to carry out the process such as roll again for being sufficiently mixed for soil and medicament toward contact, then using related physical,
The means such as chemistry repair soil.But existing chemical industry soil restoring device blanking control is inconvenient, and crushing effect is poor, medicament
Mixed effect is bad, influences the quality of soil remediation.Therefore, for this status, there is an urgent need to develop a kind of soil remediations to change
Kind device, to overcome the shortcomings of in currently practical application.
Summary of the invention
The purpose of the present invention is to provide a kind of soil remediations to improve device, to solve mentioned above in the background art ask
Topic.
To achieve the above object, the invention provides the following technical scheme:
A kind of soil remediation improves device, including treatment box, and the middle inside of the treatment box is equipped with fixing seat, fixing seat it is outer
Side is circumferentially with multiple stock guides, and the lower middle side part of each stock guide is equipped with medicament outlet pipe, and the inner end of medicament outlet pipe extends to solid
It is connected to chamber connection at reservation and with the annular opened up on the inside of fixing seat, multiple spray heads, medicine are installed on the downside of the medicament outlet pipe
The outer end of agent outlet pipe is connect with the pressure pump being installed on the outside for the treatment of box, and medicament inlet pipe, medicament are connected in the import of pressure pump
The other end of inlet pipe is connect with the explosive box being set at the top for the treatment of box, and crushing shaft, processing are equipped between the adjacent stock guide
The second driving motor with crushing axis connection is installed on the outside of case, multiple crushing knifes are installed on the crushing shaft, it is described solid
The lower part of reservation is circumferentially equipped with more hounds, and multiple columns matched with crushing knife, institute are equipped at the top of hound
It states and telescopic device is installed at the top of fixing seat, the piston rod end of telescopic device is equipped with striker plate, the bottom of the fixing seat
Portion is equipped with the first driving motor, and the downside output shaft of the first driving motor by shaft coupling and stirs axis connection, agitating shaft
Lower end extends to the interior bottom for the treatment of box, and the lower end of agitating shaft is equipped with paddle.
As a further solution of the present invention: the stock guide is circumferentially uniformly provided with three, and the vertical view of stock guide is sector
Shape, stock guide are the upward arc protrusion setting in middle part, and the upper middle side part of stock guide is additionally provided with fin, the inner end of fin and fixing seat
It is connected and fixed, stock guide and fin are welded and fixed with fixing seat.
As a further solution of the present invention: the inner end of the crushing shaft is connected in fixing seat and passes through axis with fixing seat
Rotation connection is held, the outer end of crushing shaft is stretched out from the side wall for the treatment of box, and the side wall of crushing shaft and treatment box is rotated by bearing
Connection.
As a further solution of the present invention: the crushing knife shape in Y-shape, and two of crushing knife branch into arc knot
Structure, the gap between crushing knife and adjacent stock guide match setting.
As a further solution of the present invention: the inner end of the hound is connected and fixed with fixing seat, the outer end of hound
It is connected and fixed with the inner sidewall for the treatment of box, hound is circumferentially uniformly provided with three, and hound and crushing shaft are correspondingly arranged vertically.
As a further solution of the present invention: the column is cylinder, the hemispherical shape in the upper end of column, crushing shaft rotation
After certain angle, the upper end of column can be located in the Liang Ge branch of crushing knife.
As a further solution of the present invention: the telescopic device is one of electric telescopic rod or hydraulic cylinder.
As a further solution of the present invention: the vertical view of the striker plate is rounded, and the top of striker plate is intermediate upward
Arc protrusion setting.
As a further solution of the present invention: the paddle is that outer end is upturned and matches with bottom in treatment box
Setting, and several through-holes are offered on paddle, the through-hole aperture on paddle is sequentially reduced from inside to outside.
Compared with prior art, the beneficial effects of the present invention are: soil to be repaired is added in hopper, by flexible dress
It sets and control adjustable striker plate at a distance from hopper and treatment box junction, and then adjust the amount that soil falls, change dress
Set whole treatment effeciency；Soil is fallen on stock guide after striker plate baffling and the gap location of adjacent stock guide, stock guide
Soil can fall between adjacent stock guide, by the second driving motor work drive crushing shaft rotation, crushing knife can be to soil
It is crushed, the structural strength of stock guide can be promoted by fin；By controlling pressure pump work, medicament can be sprayed by spray head
Soil is repaired, chamber interconnecting for realizing each medicament outlet pipe is connected to by annular, passes through the first driving motor
Work can drive paddle to rotate, and can further promote the repairing effect of soil to soil stirring by paddle, pass through stirring
The through-hole being arranged on leaf can play the role of auxiliary and change soil flow direction, can further be added to fixing seat by the setting of hound
It is strong fixed, cooperated by column and crushing knife, can avoid soil accumulation between the Liang Ge branch of crushing knife, promote treatment effect.
Device blanking control is simple and convenient, good crushing effect, high-efficient, and medicament good mixing effect improves the repairing quality of soil,
Conducive to popularization.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the overlooking structure diagram of stock guide part in the present invention.
Fig. 3 is the lateral cross schematic diagram of stock guide part in the present invention.
Fig. 4 is the structural schematic diagram of fixing seat in the present invention.
In figure: 1- explosive box, 2- medicament inlet pipe, 3- solenoid valve, 4- pressure pump, 5- speed changer, 6- fin, 7- stock guide,
8- spray head, 9- medicament outlet pipe, 10- hound, 11- column, 12- treatment box, 13- blow-off valve, 14- drainage conduit, 15- agitating shaft,
16- paddle, 17- through-hole, the first driving motor of 18-, 19- crushing knife, 20- crushing shaft, the second driving motor of 21-, 22- are fixed
Seat, 23- telescopic device, 24- striker plate, 25- hopper, 26- telescopic device mounting groove, 27- driving motor mounting groove, 28- annular
It is connected to chamber.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Please refer to Fig. 1~4, in the embodiment of the present invention, a kind of soil remediation improves device, including treatment box 12, the place
The tapered structure in upper and lower part of case 12 is managed, the middle inside of the treatment box 12 is equipped with fixing seat 22, fixing seat 22
External circumferential is equipped with multiple stock guides 7, and the stock guide 7 is circumferential to be uniformly provided with three, and the vertical view of stock guide 7 is fan shape, is led
The inner end of flitch 7 is connected and fixed with fixing seat 22, and the outer end of the stock guide 7 and the inner wall for the treatment of box 12 are connected and fixed, described
Stock guide 7 is the upward arc protrusion setting in middle part, and conducive to the landing of soil, the upper middle side part of the stock guide 7 is additionally provided with fin
6, inner end and the fixing seat 22 of fin 6 are connected and fixed, specifically, the stock guide 7 and fin 6 are welded and fixed with fixing seat 22,
Not only can be to 7 structural strengthening of stock guide by fin 6, but also it is conducive to the shunting of soil, the lower middle side part of each stock guide 7 is equipped with medicine
Agent outlet pipe 9, the inner end of medicament outlet pipe 9, which extends at fixing seat 22 and is connected to chamber 28 with the annular opened up on the inside of fixing seat 22, to be connected
It is logical, the interconnecting for realizing each medicament outlet pipe 9 of chamber 28 is connected to by annular, the downside of the medicament outlet pipe 9 is equipped with
Multiple spray heads 8, soil can be repaired by spraying medicament by spray head 8, and the outer end of the medicament outlet pipe 9 is from the side for the treatment of box 12
Wall stretches out, and medicament outlet pipe 9 and the side wall for the treatment of box 12 are sealedly and fixedly connected, the outer end of medicament outlet pipe 9 be installed on treatment box
The pressure pump 4 in 12 outsides connects, and is connected with medicament inlet pipe 2 in the import of pressure pump 4, the other end of medicament inlet pipe 2 be set to place
The explosive box 1 for managing 12 top of case connects, and is additionally provided with solenoid valve 3 on medicament inlet pipe 2, is worked by control pressure pump 4, medicament can lead to
It crosses medicament inlet pipe 2 to be transported in medicament outlet pipe 9, be sprayed afterwards by spray head 8, to soil remediation, between the adjacent stock guide 7
Equipped with crushing shaft 20, the inner end of crushing shaft 20 is connected in fixing seat 22 and is rotatablely connected with fixing seat 22 by bearing, described
The outer end of crushing shaft 20 is stretched out from the side wall for the treatment of box 12, and the side wall of crushing shaft 20 and treatment box 12 is rotated by bearing and connected
It connects, the outside for the treatment of box 12 is equipped with the second driving motor 21 connecting with crushing shaft 20, the second driving motor 21 and crushing shaft
It is also equipped with speed changer 5 between 20, can control crushing shaft 20 to rotate by the second driving motor 21, installed on the crushing shaft 20
There are multiple crushing knifes 19, the crushing knife 19 shape in Y-shape, and two of crushing knife 19 branch into arcuate structure, the crushing
Gap between knife 19 and adjacent stock guide 7 matches setting, i.e., small close to 19 size of side crushing knife of fixing seat 22, separate
19 size of side crushing knife of fixing seat 22 is big, can be crushed to soil by the rotation of crushing knife 19, the lower part of the fixing seat 22
More hounds 10 circumferentially are installed, inner end and the fixing seat 22 of hound 10 are connected and fixed, the outer end of hound 10 and processing
The inner sidewall of case 12 is connected and fixed, and the hound 10 is circumferential to be uniformly provided with three, and hound 10 and crushing shaft 20 are corresponding vertically
Setting, the top of hound 10 are equipped with multiple columns 11 matched with crushing knife 19, and column 11 is cylinder, column 11 it is upper
After holding hemispherical shape, crushing shaft 20 to turn an angle, the upper end of column 11 can be located in the Liang Ge branch of crushing knife 19.
The top of the fixing seat 22 is equipped with telescopic device 23, and telescopic device 23 is in electric telescopic rod or hydraulic cylinder
One kind, telescopic device 23 are mounted in the telescopic device mounting groove 26 at 22 top of fixing seat, the piston rod of telescopic device 23
End is equipped with striker plate 24, and the vertical view of the striker plate 24 is rounded, and the top of striker plate 24 is intermediate arc protrusion upwards
Setting is extended by control telescopic device 23, and striker plate 24 can be to hopper 25 and 12 junction for the treatment of box is sealed and gap
Big minor adjustment, controls soil blanking, and the bottom of the fixing seat 22 is equipped with the first driving motor 18, the first driving motor 18 peace
Dress is fixed in the driving motor mounting groove 27 of 22 bottom of fixing seat, and the downside output shaft of the first driving motor 18 passes through shaft coupling
It is connect with agitating shaft 15, the lower end of agitating shaft 15 extends to the interior bottom for the treatment of box 12, and the lower end of agitating shaft 15 is equipped with stirring
Leaf 16, the paddle 16 are that outer end is upturned and matches setting with bottom in treatment box 12, and opens up on paddle 16
There are several through-holes 17,17 aperture of through-hole on paddle 16 is sequentially reduced from inside to outside, can be to soil by the rotation of paddle 16
Stirring promotes repairing effect, can play the role of auxiliary by through-hole 17 and change soil flow direction, further promote soil remediation effect
Fruit.
The top connection of the treatment box 12 is equipped with hopper 25, and the bottom connection for the treatment of box 12 is equipped with drainage conduit 14, and arranges
Expects pipe 14 is equipped with blow-off valve 13, can be added in soil to treatment box 12 by hopper 25, passes through the controllable discharge of drainage conduit 14
Soil.
The soil remediation improves device, further includes PLC controller (not shown), is equipped with control panel in PLC controller,
Control panel and the input terminal of PLC controller are electrically connected, the output end of PLC controller respectively with solenoid valve 3, pressure pump 4, stretch
Compression apparatus 23, the first driving motor 18 and the second driving motor 21 are electrically connected.
Soil to be repaired is added in hopper 25, controls adjustable striker plate 24 and hopper by carrying out to telescopic device 23
25 and 12 junction for the treatment of box distance, and then adjust soil fall amount, change device entirety treatment effeciency；Soil passes through
It is fallen on after 24 baffling of striker plate on stock guide 7 and the gap location of adjacent stock guide 7, the soil of stock guide 7 can fall on adjacent guide
It between plate 7, is worked by the second driving motor 21 and crushing shaft 20 is driven to rotate, crushing knife 19 can crush soil, pass through
Fin 6 can promote the structural strength of stock guide 7；By control pressure pump 4 work, medicament can by spray head 8 spray to soil into
Row is repaired, and is connected to the interconnecting for realizing each medicament outlet pipe 9 of chamber 28 by annular, is worked by the first driving motor 18
Paddle 16 can be driven to rotate, the repairing effect of soil can be further promoted to soil stirring by paddle 16, pass through stirring
The through-hole 17 being arranged on leaf 16 can play the role of auxiliary and change soil flow direction, can be further to solid by the setting of hound 10
Reservation 22 is reinforced fixing, and is cooperated by column 11 and crushing knife 19, can avoid soil accumulation between the Liang Ge branch of crushing knife 19,
Promote treatment effect.
The above are merely the preferred embodiment of the present invention, it is noted that for those skilled in the art, not
Under the premise of being detached from present inventive concept, several modifications and improvements can also be made, these also should be considered as protection model of the invention
It encloses, these all will not influence the effect and patent practicability that the present invention is implemented.
Claims (9)
1. a kind of soil remediation improves device, including treatment box (12), which is characterized in that the middle inside of the treatment box (12)
Equipped with fixing seat (22), the external circumferential of fixing seat (22) is equipped with multiple stock guides (7), the lower middle side part of each stock guide (7)
Equipped with medicament outlet pipe (9), the inner end of medicament outlet pipe (9) extend at fixing seat (22) and with the ring that is opened up on the inside of fixing seat (22)
Shape is connected to chamber (28) connection, is equipped with multiple spray heads (8) on the downside of the medicament outlet pipe (9), the outer end of medicament outlet pipe (9) and peace
Loaded on pressure pump (4) connection on the outside for the treatment of box (12), medicament inlet pipe (2), medicament inlet pipe are connected in the import of pressure pump (4)
(2) the other end is connect with the explosive box (1) being set at the top for the treatment of box (12), and powder is equipped between the adjacent stock guide (7)
Broken axis (20) is equipped with the second driving motor (21) connecting with crushing shaft (20), the crushing shaft on the outside for the treatment of box (12)
(20) it is equipped on multiple crushing knifes (19), the lower part of the fixing seat (22) is circumferentially equipped with more hounds (10), diagonal brace
Multiple columns (11) matched with crushing knife (19) are installed at the top of bar (10).
2. soil remediation according to claim 1 improves device, which is characterized in that the stock guide (7) circumferentially uniformly sets
There are three, the vertical view of stock guide (7) is fan shape, and stock guide (7) is the upward arc protrusion setting in middle part, stock guide (7) it is upper
Middle side part is additionally provided with fin (6), and inner end and the fixing seat (22) of fin (6) are connected and fixed, stock guide (7) and fin (6) and solid
Reservation (22) is welded and fixed.
3. soil remediation according to claim 1 improves device, which is characterized in that the inner end of the crushing shaft (20) connects
It is rotatablely connected on fixing seat (22) and with fixing seat (22) by bearing, the side of the outer end of crushing shaft (20) from treatment box (12)
Wall stretches out, and crushing shaft (20) and the side wall for the treatment of box (12) are rotatablely connected by bearing.
4. soil remediation according to claim 1 or 3 improves device, which is characterized in that the crushing knife (19) is in Y-shape
Shape, and two of crushing knife (19) branch into arcuate structure, the gap between crushing knife (19) and adjacent stock guide (7) matches
Setting.
5. soil remediation according to claim 4 improves device, which is characterized in that the inner end of the hound (10) and solid
Reservation (22) is connected and fixed, and the outer end of hound (10) and the inner sidewall for the treatment of box (12) are connected and fixed, and hound (10) is circumferential
Three are uniformly provided with, hound (10) and crushing shaft (20) are correspondingly arranged vertically.
6. soil remediation according to claim 5 improves device, which is characterized in that the column (11) is cylinder, column
(11) the hemispherical shape in upper end, after crushing shaft (20) turns an angle, the upper end of column (11) can be located at crushing knife
(19) in Liang Ge branch.
7. soil remediation according to claim 1 improves device, which is characterized in that install at the top of the fixing seat (22)
Have telescopic device (23), telescopic device (23) is one of electric telescopic rod or hydraulic cylinder, the piston rod of telescopic device (23)
End is equipped with striker plate (24), and the vertical view of striker plate (24) is rounded, and the top of striker plate (24) is that intermediate arc upwards is convex
It is arranged out.
8. soil remediation according to claim 1 or claim 7 improves device, which is characterized in that the bottom of the fixing seat (22)
It is equipped with the first driving motor (18), the downside output shaft of the first driving motor (18) is connected by shaft coupling and agitating shaft (15)
It connects, the lower end of agitating shaft (15) extends to the interior bottom for the treatment of box (12), and the lower end of agitating shaft (15) is equipped with paddle (16).
9. soil remediation according to claim 8 improves device, which is characterized in that the paddle (16) is that outer end is upward
It tilts and matches setting with treatment box (12) interior bottom, and offer several through-holes (17), paddle on paddle (16)
(16) through-hole (17) aperture on is sequentially reduced from inside to outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810691717.3A CN108971209B (en) | 2018-06-28 | 2018-06-28 | Soil remediation improves device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810691717.3A CN108971209B (en) | 2018-06-28 | 2018-06-28 | Soil remediation improves device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108971209A true CN108971209A (en) | 2018-12-11 |
| CN108971209B CN108971209B (en) | 2020-10-09 |
Family
ID=64538809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810691717.3A Expired - Fee Related CN108971209B (en) | 2018-06-28 | 2018-06-28 | Soil remediation improves device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108971209B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111330964A (en) * | 2020-03-14 | 2020-06-26 | 陈国海 | Soil remediation system and soil remediation method |
| CN111715685A (en) * | 2020-06-29 | 2020-09-29 | 西华师范大学 | Electric soil heavy metal restoration reaction device |
| CN113940155A (en) * | 2021-10-20 | 2022-01-18 | 浡江生态建设集团有限公司 | Soil remediation device for lawn protection |
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| US6129296A (en) * | 1999-06-08 | 2000-10-10 | Poarch Bros. Inc. | Double roll peg feeder assembly for flaking mills |
| CN206881657U (en) * | 2017-06-15 | 2018-01-16 | 浙江科工环保技术有限公司 | A kind of soil remediation medicament filling apparatus |
| CN107803396A (en) * | 2017-11-14 | 2018-03-16 | 郑州艾莫弗信息技术有限公司 | Contaminated soil crushes dosing and mixes controlling device |
| CN207401560U (en) * | 2017-10-16 | 2018-05-25 | 济宁市技师学院 | Suitable for the reducing mechanism of textile raw material |
| CN108126557A (en) * | 2017-12-22 | 2018-06-08 | 张王斌 | A kind of gardening pot flowers soil mixed processing device |
| CN207483626U (en) * | 2017-11-13 | 2018-06-12 | 徐美琴 | A kind of pig manure total system |
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2018
- 2018-06-28 CN CN201810691717.3A patent/CN108971209B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6129296A (en) * | 1999-06-08 | 2000-10-10 | Poarch Bros. Inc. | Double roll peg feeder assembly for flaking mills |
| CN206881657U (en) * | 2017-06-15 | 2018-01-16 | 浙江科工环保技术有限公司 | A kind of soil remediation medicament filling apparatus |
| CN207401560U (en) * | 2017-10-16 | 2018-05-25 | 济宁市技师学院 | Suitable for the reducing mechanism of textile raw material |
| CN207483626U (en) * | 2017-11-13 | 2018-06-12 | 徐美琴 | A kind of pig manure total system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111330964A (en) * | 2020-03-14 | 2020-06-26 | 陈国海 | Soil remediation system and soil remediation method |
| CN111330964B (en) * | 2020-03-14 | 2021-08-17 | 广西万华生态科技有限公司 | Soil remediation system and soil remediation method |
| CN111715685A (en) * | 2020-06-29 | 2020-09-29 | 西华师范大学 | Electric soil heavy metal restoration reaction device |
| CN113940155A (en) * | 2021-10-20 | 2022-01-18 | 浡江生态建设集团有限公司 | Soil remediation device for lawn protection |
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| Publication number | Publication date |
|---|---|
| CN108971209B (en) | 2020-10-09 |
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