CN206720751U - A kind of bittern takes off iodine system - Google Patents
A kind of bittern takes off iodine system Download PDFInfo
- Publication number
- CN206720751U CN206720751U CN201720262500.1U CN201720262500U CN206720751U CN 206720751 U CN206720751 U CN 206720751U CN 201720262500 U CN201720262500 U CN 201720262500U CN 206720751 U CN206720751 U CN 206720751U
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- Prior art keywords
- bittern
- iodine
- tank
- adsorption column
- control valve
- 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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- 229910052740 iodine Inorganic materials 0.000 title claims abstract description 89
- 239000011630 iodine Substances 0.000 title claims abstract description 89
- 241001131796 Botaurus stellaris Species 0.000 title claims abstract description 81
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 238000001179 sorption measurement Methods 0.000 claims abstract description 72
- 239000007800 oxidant agent Substances 0.000 claims abstract description 23
- 230000001590 oxidative effect Effects 0.000 claims abstract description 23
- 238000011084 recovery Methods 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 27
- 239000003463 adsorbent Substances 0.000 abstract description 18
- 150000001875 compounds Chemical class 0.000 abstract description 9
- 235000011121 sodium hydroxide Nutrition 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 8
- 238000001914 filtration Methods 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 2
- 230000007420 reactivation Effects 0.000 abstract 1
- 238000006479 redox reaction Methods 0.000 abstract 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 16
- 230000008929 regeneration Effects 0.000 description 14
- 238000011069 regeneration method Methods 0.000 description 14
- 150000003839 salts Chemical class 0.000 description 11
- 239000012528 membrane Substances 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000012266 salt solution Substances 0.000 description 8
- 239000002244 precipitate Substances 0.000 description 7
- 229920002472 Starch Polymers 0.000 description 6
- 239000012267 brine Substances 0.000 description 6
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 6
- 235000019698 starch Nutrition 0.000 description 6
- 239000008107 starch Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000003014 ion exchange membrane Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 150000002496 iodine Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Landscapes
- Water Treatment By Sorption (AREA)
Abstract
Caustic soda preparation field is the utility model is related to, a kind of bittern is disclosed and takes off iodine system, be characterized in that：Including bittern tank, acidizer tank, oxidant tank, retort, the first adsorption column and de- iodine bittern tank.Wherein bittern tank is connected by the first communicating pipe with retort, first communicating pipe was also connected with acidizer tank and oxidant tank respectively, retort is connected by the second communicating pipe with the first adsorption column, the first elemental iodine recovery tube is connected with first adsorption column, first adsorption column is connected by third connecting pipe with de- iodine bittern tank, by adjusting pH value, redox reaction, compound adsorbent is added in bittern, filtering, adsorbent reactivation, solve existing bittern and take off iodine method and system, there is higher harm to subsequent ion film in the presence of the accessory substance of generation, it is simultaneously complicated, equipment cost is excessively high, the problem of medium-sized and small enterprises are beyond affordability.
Description
Technical field
Caustic soda preparation field is the utility model is related to, is concretely that a kind of bittern takes off iodine system.
Background technology
China turns into the first in the world production of caustic soda big country, but overall operation level is not high, and amberplex uses the longevity
Life also larger gap compared with Foreign Advanced Lerel.Device continuous operating time is short, and amberplex service life falls short of.
Electric groove equally, same film, same electrolysis process, the membrane lifetime in China averagely only has 2.5 years, and the film longevity of developed country
Life is reachable 3~6 years, or even longer, and comprehensive energy consumption country average level is higher by more than 30 times than foreign countries.
One of prime cost of ion film caustic soda is ionic membrane, and not only itself is expensive, and its is whether normal
Directly determine the energy consumption and operating cost of production process.It is exactly to contain in raw brine to influence one of principal element of service life of ion-exchange membrane
There is iodine.Iodine generates IO in electrolytic process3-Or IO5 3-, with Ca a small amount of in salt solution2+、Mg2+、Ba2+Etc. extremely difficult molten salt can be generated
It is deposited on ionic membrane, causes electrolytic bath pressure rise, current efficiency reduces, not only causes frequently to stop, drives, also cause ion
Membrane lifetime greatly shortens.
Result of study shows that, when content of iodine is more than 0.4ppm in salt solution, service life of ion-exchange membrane will greatly shorten.So state
The content of iodine that outer ionic membrane manufacturer is required in raw brine is not higher than 0.4ppm, or even requires to be less than 0.2ppm or lower.Cause
This, it is one of ion film caustic soda industry key technology in the urgent need to address to take off iodine technology.Especially directly it is using former bittern
The ion film caustic soda of raw material, because content of iodine is both greater than 0.2ppm in the ore deposit halogen in most areas, which limits direct raw brine
Application.So most producers are all to make raw material with industrial solid salt.Bittern salt manufacturing inherently high energy-consuming industry, Nacl valency
Lattice are higher, and alkaline cost is higher.
Former bittern can be directly used for ion film caustic soda after taking off iodine, it is not necessary to solid salt be made, so bittern takes off iodine and can saved
The about substantial amounts of salt manufacturing energy, it is an energy-conserving and emission-cutting technology to caustic soda industry.In addition, industrial solid salt also contains micro iodine,
In long-term recycling, iodine also can be accumulated gradually salt solution, and content of iodine also can be exceeded after running a period of time, and many enterprises are
It is found that this problem of, the life-span of the certain entail dangers to ionic membrane of accumulation of this iodine.
Prior art discloses a kind of cleaning equipment of iodine in ion film caustic soda production technology salt solution and operating method are (open
Number：105293779A), wherein being reacted by the completion that automatically controls to salt solution pH and current potential, the iodine after reaction in salt solution is being inhaled
Adsorbed in attached system, the adsorption column after adsorption saturation is pumped into regenerated liquid through regenerative system and completes regenerative process, above-mentioned " reaction → suction
Attached → regeneration " process continuous and steady operation.In control of Electric potentials, potentiometer electric discharge be present and IO is generated in bittern3-Or IO5 3-, with
A small amount of Ca in salt solution2+、Mg2+、Ba2+It is deposited in etc. extremely difficult molten salt can be generated on ionic membrane, causes electrolytic bath pressure rise,
Current efficiency reduces, and not only causes frequently to stop, drives, also causes service life of ion-exchange membrane to greatly shorten.Although this method can go out
Iodine, but the accessory substance generated has higher harm to subsequent ion film, and meanwhile it is complicated, equipment cost is excessively high, medium and small
Type enterprise is beyond affordability.
Therefore needing one kind simple in construction, the byproduct for having harm to ionic membrane will not be produced, equipment cost is more cheap,
It disclosure satisfy that a kind of bittern of medium-sized and small enterprises' demand takes off iodine system.
Utility model content
The utility model takes off iodine system for existing bittern, exist the accessory substance of generation have to subsequent ion film it is more high-risk
Evil, at the same it is complicated, and equipment cost is excessively high, and medium-sized and small enterprises are beyond affordability.The problem of, there is provided a kind of bittern takes off iodine system
System.
The utility model solves above-mentioned technical problem, and the technical scheme of use is that a kind of bittern takes off iodine system, including bittern
Tank, acidizer tank, oxidant tank, retort, the first adsorption column and de- iodine bittern tank.Wherein bittern tank by the first communicating pipe with
Retort connects, and also be connected respectively with acidizer tank and oxidant tank the first communicating pipe, and retort passes through the second communicating pipe and the
One adsorption column connects, and the first elemental iodine recovery tube is connected with the first adsorption column, the first adsorption column is by third connecting pipe with taking off
Iodine bittern tank connects.
Further, retort is also connected by the second communicating pipe with the second adsorption column, and is connected with the second adsorption column
Two elemental iodine recovery tubes, the second adsorption column are connected by third connecting pipe with de- iodine bittern tank.
Further, bittern booster pump, the first control valve, the second control valve are provided with the first communicating pipe, wherein bittern increases
Press pump is located at the first communicating pipe and bittern tank junction, and the first control valve is located at the first communicating pipe and acidizer tank junction.The
Two control valves are provided with the 3rd control valve and the 4th control the second communicating pipe located at the first communicating pipe and oxidant tank junction
Valve.3rd control valve is located at the second communicating pipe and second located at the second communicating pipe and the first adsorption column junction, the 4th control valve
Adsorption column junction, third connecting pipe are provided with the 5th control valve and the 6th control valve.5th control valve is located at third connecting pipe
With the first adsorption column junction, the 6th control valve is located at third connecting pipe and the second adsorption column junction, the recovery of the first elemental iodine
Pipe is provided with the 7th control valve, and the second elemental iodine recovery tube is provided with the 8th control valve.
The purpose so designed is, the bittern in bittern tank first is passed into retort by the first communicating pipe during use
In, then the acidizer in acidizer tank is passed into retort by the first communicating pipe again, manufactures a pH acid reaction
Environment, then the oxidant in oxidant tank is passed into retort again, oxidant is under the environment of acidity by bittern
I-Iodine is oxidized to, then the aqueous salt brine dissolved with iodine is passed through in adsorption column, will by adding compound adsorbent
Iodine in bittern separates out, and will be excluded by filtering without iodine bittern, realizes bittern and takes off iodine.
Simultaneously as being provided with two adsorption columns, in use, it will first contain iodine bittern and be passed on the first adsorption column, add
Enter compound adsorbent and separate out iodine, then filter and separate flocky precipitate with liquid, be then shut off on the first adsorption column
3rd control valve, the 4th control valve is opened, bittern containing iodine is passed into the second adsorption column and carries out adsorption filtration, now the first adsorption column
Middle flocky precipitate is separated adsorbent with iodine by way of heating, and by the first elemental iodine recovery tube by iodine
Reclaimed, while realize the regeneration of adsorbent, after the absorption column regeneration in the first adsorption column, open the 3rd control
Valve, the 4th control valve is closed, the adsorbent in the second adsorption column is regenerated, the bittern containing iodine in the first adsorption column is inhaled
It is attached, this process is circulated, an adsorption column adsorbs iodine, another absorption column regeneration, is used alternatingly and equipment greatly improved
Operating efficiency, while the iodine being dissolved in by starch in bittern carries out precipitation and forms flocky precipitate, it is possible to achieve
Bittern takes off iodine, while based on the heated characteristic easily to gasify of iodine, starch is separated with elemental iodine by heating, is realized compound
The regeneration of adsorbent, the starch after regeneration can reuse, and significantly reduce production cost.
The beneficial effects of the utility model comprise at least one below；
1st, change the pH value of bittern by adding a certain amount of acidizer, can be greatly improved when pH value is in acidic region
The action effect of oxidant, by adding oxidant by the I in bittern-Aoxidized, generate water and iodine, do not pass through electricity
Solution, will not produce the accessory substance for having higher harm to subsequent ion film, solve potentiometer electric discharge in the prior art in bittern
Generate IO3-Or IO5 3-, with Ca a small amount of in salt solution2+、Mg2+、Ba2+It is deposited on ionic membrane, causes etc. extremely difficult molten salt can be generated
Electrolytic bath pressure rise, current efficiency reduce, not only cause frequently to stop, drive, and also cause what service life of ion-exchange membrane greatly shortened to ask
Topic.
2nd, the iodine being dissolved in by starch in bittern carries out precipitation and forms flocky precipitate, it is possible to achieve bittern takes off
Iodine, while based on the heated characteristic easily to gasify of iodine, starch is separated with elemental iodine by heating, realizes compound adsorbent
Regeneration, the starch after regeneration can reuse, and significantly reduce production cost.
3rd, it is passed into by the bittern in bittern tank by the first communicating pipe in retort, then again by acidizer tank
Acidizer is passed into retort by the first communicating pipe, an acid reaction environment is manufactured, then again by oxidant tank
Oxidant is passed into retort, and oxidant is under the environment of acidity by the I in bittern-Iodine is oxidized to, then will dissolving
The aqueous salt brine for having iodine is passed through in adsorption column, is separated out the iodine in bittern by adding compound adsorbent, and pass through
Filtering will be excluded without iodine bittern, be realized bittern and be taken off iodine.
4th, it is passed into by the way that iodine bittern will be contained on the first adsorption column, adds compound adsorbent and separate out iodine, then filter
Flocky precipitate is separated with liquid, the 3rd control valve being then shut off on the first adsorption column, open the 4th control valve, halogen containing iodine
Water is passed into the second adsorption column and carries out adsorption filtration, and now flocky precipitate will absorption by way of heating in the first adsorption column
Agent is separated with iodine, and is reclaimed iodine by the first elemental iodine recovery tube, while realizes the regeneration of adsorbent,
After the absorption column regeneration in the first adsorption column, the 3rd control valve is opened, the 4th control valve is closed, in the second adsorption column
Adsorbent regenerated, the bittern containing iodine in the first adsorption column is adsorbed, and circulates this process, and an adsorption column absorption is single
Matter iodine, another absorption column regeneration, is used alternatingly the operating efficiency that equipment greatly improved.
5th, conventional chemical change is only relied on, the equipment such as potentiometer are not used, equipment cost is more cheap, in disclosure satisfy that
Small business's demand.
Brief description of the drawings
Fig. 1 is that a kind of bittern takes off iodine system structure diagram；
In figure mark for：1 be bittern tank, 2 be acidizer tank, 3 be oxidant tank, 4 be the first communicating pipe, 5 be retort,
6 it was the second communicating pipe, 7 be the first adsorption column, 8 be the second adsorption column, 9 be third connecting pipe, 10 be de- iodine bittern tank, 11 is
First elemental iodine recovery tube, 12 be the second elemental iodine recovery tube, 13 be bittern booster pump, 14 be the first control valve, 15 be second
Control valve, 16 be the 3rd control valve, 17 be the 4th control valve, 18 be the 5th control valve, 19 be the 6th control valve, 20 be the 7th
Control valve, 21 are the 8th control valve.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage can become apparent from understanding, below in conjunction with accompanying drawing and
The utility model is further elaborated embodiment.It should be appreciated that specific embodiment described herein only to
The utility model is explained, is not used to limit the utility model protection content.
In description of the present utility model, it is to be understood that term " one end ", " center ", " circumference ", " on ", it is " interior
The orientation or position relationship of the instruction such as side ", " outside ", " other end ", " middle part ", " top ", " side " are based on shown in accompanying drawing
Orientation or position relationship, be for only for ease of description the utility model and simplify and describe, rather than instruction or imply signified
Device or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that new to this practicality
The limitation of type.
Embodiment 1
As shown in figure 1, a kind of bittern takes off iodine system structure diagram, a kind of bittern, which takes off iodine system, includes bittern tank 1, acidity
Agent tank 2, oxidant tank 3, retort 5, the first adsorption column 7 and de- iodine bittern tank 10.Wherein bittern tank 1 passed through for the first communicating pipe 4
Connected with retort 5, the first communicating pipe 4 was also connected with acidizer tank 2 and oxidant tank 3 respectively.Retort 5 passes through the second connection
Pipe 6 is connected with the first adsorption column 7, and the first elemental iodine recovery tube 11 is connected with the first adsorption column 7, and the first adsorption column 7 passes through
Tee joint pipe 9 connects with de- iodine bittern tank 10.
First the bittern in bittern tank is passed into retort by the first communicating pipe during use, then again by acidizer tank
In acidizer be passed into by the first communicating pipe in retort, manufacture the acid reaction environment that pH is 3.5~5, then
The oxidant in oxidant tank is passed into retort again, oxidant is under the environment of acidity by the I in bittern-It is oxidized to list
Matter iodine, then the aqueous salt brine dissolved with iodine is passed through in adsorption column, by adding compound adsorbent by the list in bittern
Matter iodine separates out, and will be excluded by filtering without iodine bittern, realizes bittern and takes off iodine.
Embodiment 2
Based on embodiment 1, retort 5 is also connected by the second communicating pipe 6 with the second adsorption column 8, is connected on the second adsorption column 8
The second elemental iodine recovery tube 12 is connected to, the second adsorption column 8 is connected by third connecting pipe 9 with de- iodine bittern tank 10.First connection
Pipe 4 is provided with bittern booster pump 13, the first control valve 14, the second control valve 15, bittern booster pump 13 located at first communicating pipe 4 with
The junction of bittern tank 1.First control valve 14 is located at located at the first communicating pipe 4 and the junction of acidizer tank 2, the second control valve 15
First communicating pipe 4 and the junction of oxidant tank 3, are provided with the 3rd control valve 16 and the 4th control valve 17 second communicating pipe 6, and the 3rd
Control valve 16 is located at the second communicating pipe 6 and the junction of the first adsorption column 7, and the 4th control valve 17 was located at for the second communicating pipe 6 and second
The junction of adsorption column 8, third connecting pipe 9 are provided with the 5th control valve 18 and the 6th control valve 19, and the 5th control valve 18 is located at the
The junction of 9 and first adsorption column of tee joint pipe 7, the 6th control valve 19 are located at the junction of 9 and second adsorption column of third connecting pipe 8,
First elemental iodine recovery tube 11 is provided with the 7th control valve 20, and the second elemental iodine recovery tube 12 is provided with the 8th control valve 21.
Due to being provided with two adsorption columns, in use, it will first contain iodine bittern and be passed on the first adsorption column, add compound
Adsorbent separates out iodine, then filters and separates flocky precipitate with liquid, the 3rd control being then shut off on the first adsorption column
Valve processed, the 4th control valve is opened, bittern containing iodine is passed into the second adsorption column and carries out adsorption filtration, now cotton-shaped in the first adsorption column
Sediment is separated adsorbent with iodine by way of heating, and is returned iodine by the first elemental iodine recovery tube
Receive, while realize the regeneration of adsorbent, after the absorption column regeneration in the first adsorption column, open the 3rd control valve, close
The 4th control valve is closed, the adsorbent in the second adsorption column is regenerated, the bittern containing iodine in the first adsorption column is adsorbed, and is followed
This process of ring, an adsorption column adsorb iodine, another absorption column regeneration, the work that equipment greatly improved are used alternatingly
Efficiency.
Claims (3)
1. a kind of bittern takes off iodine system, it is characterised in that：Including bittern tank（1）, acidizer tank（2）, oxidant tank（3）, reaction
Tank（5）, the first adsorption column（7）With de- iodine bittern tank（10）, the bittern tank（1）Passed through for the first communicating pipe（4）With retort（5）
Connection, first communicating pipe（4）Also respectively with acidizer tank（2）With oxidant tank（3）Connection, the retort（5）Pass through
Second communicating pipe（6）With the first adsorption column（7）Connection, first adsorption column（7）On be connected with the first elemental iodine recovery tube
（11）, the first adsorption column（7）Pass through third connecting pipe（9）With de- iodine bittern tank（10）Connection.
2. a kind of bittern according to claim 1 takes off iodine system, it is characterised in that：The retort（5）Connect by second
Siphunculus（6）Also with the second adsorption column（8）Connection, second adsorption column（8）On be connected with the second elemental iodine recovery tube（12）, the
Two adsorption columns（8）Pass through third connecting pipe（9）With de- iodine bittern tank（10）Connection.
3. a kind of bittern according to claim 2 takes off iodine system, it is characterised in that：First communicating pipe（4）It is provided with
Bittern booster pump（13）, the first control valve（14）, the second control valve（15）, the bittern booster pump（13）Located at the first communicating pipe
（4）With bittern tank（1）Junction, first control valve（14）Located at the first communicating pipe（4）With acidizer tank（2）Junction,
Second control valve（15）Located at the first communicating pipe（4）With oxidant tank（3）Junction, second communicating pipe（6）On set
There is the 3rd control valve（16）With the 4th control valve（17）, the 3rd control valve（16）Located at the second communicating pipe（6）Inhaled with first
Attached column（7）Junction, the 4th control valve（17）Located at the second communicating pipe（6）With the second adsorption column（8）Junction, described
Tee joint pipe（9）It is provided with the 5th control valve（18）With the 6th control valve（19）, the 5th control valve（18）Connect located at the 3rd
Siphunculus（9）With the first adsorption column（7）Junction, the 6th control valve（19）Located at third connecting pipe（9）With the second adsorption column
（8）Junction, the first elemental iodine recovery tube（11）It is provided with the 7th control valve（20）, the second elemental iodine recovery tube
（12）It is provided with the 8th control valve（21）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720262500.1U CN206720751U (en) | 2017-03-17 | 2017-03-17 | A kind of bittern takes off iodine system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720262500.1U CN206720751U (en) | 2017-03-17 | 2017-03-17 | A kind of bittern takes off iodine system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206720751U true CN206720751U (en) | 2017-12-08 |
Family
ID=60501090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720262500.1U Expired - Fee Related CN206720751U (en) | 2017-03-17 | 2017-03-17 | A kind of bittern takes off iodine system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206720751U (en) |
-
2017
- 2017-03-17 CN CN201720262500.1U patent/CN206720751U/en not_active Expired - Fee Related
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Granted publication date: 20171208 |