CN101801532A - Agitation grinder - Google Patents
Agitation grinder Download PDFInfo
- Publication number
- CN101801532A CN101801532A CN200780100274A CN200780100274A CN101801532A CN 101801532 A CN101801532 A CN 101801532A CN 200780100274 A CN200780100274 A CN 200780100274A CN 200780100274 A CN200780100274 A CN 200780100274A CN 101801532 A CN101801532 A CN 101801532A
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- CN
- China
- Prior art keywords
- agitator disk
- last
- agitator
- abrasive material
- disk
- 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.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
- B02C17/161—Arrangements for separating milling media and ground material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
- B02C17/163—Stirring means
Abstract
The present invention relates to a kind of agitation grinder, this agitation grinder has grinding container (2) and is arranged in shaft (5) in the described grinding container in the mode that can be driven in rotation.The place is equipped with last agitator disk (17) in an end of shaft (2), and the have breakthrough part cage that is essentially tubular (19) of (20) is installed on described last agitator disk.Screen device (23) is arranged in the cage (19).Distance between penult agitator disk (14) and last agitator disk (17) makes it possible to form braided flow moving (32) avoid the situation that abrasive material is sifted out in advance from grinding aid medium (31) and rough lapping composition granule under.In the end be formed with passage (22) in the agitator disk (17), abrasive material enters by last agitator disk (17) through this passage together with grinding aid medium (31) and is connected rotationally in the annular gap (28) that the midfeather (27) on this last agitator disk forms with anti-.Carrying out separating of grinding aid medium (31) and rough lapping composition granule by in last agitator disk (17) and the separation chamber (21) that cage (19) forms.
Description
Technical field
The present invention relates to a kind of according to claim 1 agitation grinder as described in the preamble.
Background technology
Agitation grinder by the known a kind of the type of EP 0 751 830B1.In this agitation grinder, supporting last agitator disk of cage and the distance between the adjacent agitator disk significantly less than remaining agitator disk distance each other.Reason is, except that last agitator disk, the size of the distance between the agitator disk for make it possible to form so-called braided flow moving (
), that is, because the tangential momentum that applies of agitator disk is contiguous at agitator disk, abrasive material together with the grinding aid medium to outflow; In the central region between adjacent agitator disk, abrasive material and grinding aid medium reflux towards shaft.Moving in order to form aforesaid braided flow, the distance between the adjacent agitator disk must be enough big.This distance also can define by the so-called angle of departure/angle (Trennwinkel) folded between two lines.Wherein, line between the radial inner end on the shaft, extending at agitator disk.Another line parallel extends in the axis of shaft.Moving in order to form this braided flow, the angle of departure should be between 30 ° and 60 °.--comprising the abrasive material particle that does not fully grind as yet--in order to make the grinding aid medium separates well with abrasive material, distance between last agitator disk and the adjacent agitator disk is significantly reduced, so that moving and carry out primary dcreening operation at the upstream end of separator by avoiding forming braided flow.To realize that thus the rough lapping composition granule that most of at least grinding aid medium Buddhist monk does not fully grind can not enter separator, carries out the secondary separation of remaining grinding aid medium and rough lapping composition granule then in this separator.This has such shortcoming, i.e. these measures make that effectively the grinding space reduces and total separated region increase.
Summary of the invention
The objective of the invention is, design the agitation grinder of this type like this, make it possible to carry out the grinding of greater strength and dispersion treatment and can not increase the length of whole device, realize the grinding aid medium simultaneously and grind the better of inadequate rough lapping composition granule and separate.
According to the present invention, this purpose realizes by the feature in claim 1 characteristic.By measure of the present invention, make grinding and the dispersion treatment that in the end also can carry out big intensity between the agitator disk and adjacent agitator disk, wherein in this zone, also can form and carry out the required braided flow of described processing and move.Grinding aid medium and being separated in the separator of rough lapping composition granule of fully not grinding are carried out.The midfeather that rotates together along with shaft prevents grinding aid medium and rough lapping composition granule and the cover plate generation axial impact that seals screen device, and makes abrasive material and grinding aid medium carry towards cage with high radial velocity.The coarse granule that grinding aid medium Buddhist monk does not fully grind passes the penetrating part centrifugation radially in the cage basically, and discharges around the outward flange deflection of midfeather and by sieve in cage through the abrasive material of the dispersion of fine grinding.Improvement project according to claim 2 to 5 strengthens these effects.
By the improvement project according to claim 6, will realize more highlightedly: it is moving in the end also to occur described braided flow between an agitator disk and the adjacent agitator disk, thereby can carry out the same big milled processed between intensity and the upstream agitator disk.Has identical purpose according to claim 7 with 8 improvement project.
Making abrasive material pass completely through passage together with the grinding aid medium with conventional concentrations according to the improvement project of claim 9 imports in the gap between last agitator disk and the midfeather.
Dependent claims comprises advantageous embodiments.
Description of drawings
From the following explanation of the embodiment of the invention being carried out with reference to accompanying drawing, can learn further feature of the present invention, advantage and details.In the accompanying drawing:
Fig. 1 illustrates the schematic side elevation that the part of agitation grinder is cut open,
Fig. 2 illustrates first embodiment of the exit region of agitation grinder,
Fig. 3 illustrates second embodiment of the exit region of agitation grinder,
Fig. 4 illustrates the perspective view of agitator disk,
Fig. 5 illustrates the perspective view of last agitator disk with cage,
Fig. 6 illustrates another embodiment of agitator disk,
Fig. 7 illustrates the perspective view of another embodiment of last agitator disk with cage, and
Fig. 8 illustrates the cut-away section of last agitator disk that the cutting line VIII-VIII in Fig. 7 cuts open.
The specific embodiment
Agitation grinder shown in the accompanying drawing has frame 1, and grinding container 2 removably is fixed on this frame.Be provided with drive motors 3 in this frame 1, this drive motors drives the shaft 5 of agitator 6 by belt driver 4.Shaft 5 is bearing in the bearing 7 in rotating mode in frame 1.In grinding container 2, especially on the end relative with frame 1 of grinding container, shaft 5 is not supported, that is, be bearing in the frame 1 to shaft 5 cantilevereds.
With respect to frame 1 sealing, shaft 5 passes this cover piece to grinding container 2, wherein seals by shaft seal 9 to realize by cover piece 8.In the zone of cover piece 8, abrasive material inlet 11 feeds in the grinding chamber 10 that is surrounded by grinding container 2.Abrasive material outlet 13 grinding container 2 with abrasive material bottom 12 pass-outs of 11 relative ends that enter the mouth from the sealing grinding chamber.
The stirring tool that is designed to agitator disk 14 forms is installed on the shaft 5 as the part of agitator 6, wherein has opening 15 in the outer peripheral areas of agitator disk 14.Between the adjacent agitator disk 14, all identical on axis 16 directions of shaft 5 apart from a.The agitator disk 14 that only is close to cover piece 8 from the distance of cover piece 8 less than this apart from a.
As shown in Figure 2, last agitator disk 17 of the adjacent bottom 12 of agitator 6 is fastened on the shaft 5 by means of trip bolt 18.This agitator disk 17 equals axial distance a between aforesaid, each adjacent agitator disk 14 from penult agitator disk 14 adjacent, agitator 6 apart from a '.The diameter b of the diameter b of all agitator disks 14 and agitator disk 17 ' also equate.
In separation chamber 21, screen device 23 is to be arranged on the bottom 12 with the concentric mode of axis 16.Screen device 23 is especially so that this screen device 23 is installed on the bottom 12 in the mode that can be pulled outwardly out after pull down bottom 12.That is screen device 23 is connected with grinding container 2 in not rotatable mode.Abrasive material outlet 13 leads to the outside from the inner space 24 of screen device 23.Screen device 23 can form by the mutual in known manner annular disk with little spacing setting on its cylindricality periphery.Thereby the inboard of agitator disk 17, cage 19 and screen device 23 form separator 25.Be adjacent to agitator disk 17, screen device 23 has the cover plate 26 of sealing.Thereby the inner space 24 of screen device 23 only is connected with separation chamber 21 via screen device 23.
On agitator 6, between agitator disk 17 and cover plate 26, be furnished with the midfeather 27 of sealing, this midfeather rotates and has defined gap 28 together along with agitator 6.Though this midfeather is fastened on the shaft 5 by means of trip bolt 18 in according to the embodiment of Fig. 2, midfeather 27 ' directly is fixed on the agitator disk 17 by means of the wing distance piece 29 that distributes around periphery in according to the embodiment of Fig. 3.This midfeather 27 and 27 ' extends beyond cover plate 26 separately diametrically at least, promptly satisfies: c 〉=d, and wherein c is the diameter separately of midfeather 27 or 27 ', and d is the diameter of cover plate 26.Preferably, c＞d, wherein corresponding midfeather 27 ' extend in the very near distance of cage 19 always.
Be with difference according to the embodiment of Fig. 3 according to the embodiment of Fig. 2, in agitator 17 ' on a side of adjacent agitator disk 14, be formed with agitator disk 14 in opening 15 have identical shaped one side closed depressed part (Vertiefung) 30, described depressed part has the cross section identical with opening 15, but does not feed in the separation chamber 21.
As shown in Figure 4, the opening 15 in the agitator disk 14 can have circular cross section.Therefore the one side closed depressed part 30 in the agitator disk 17 ' correspondingly is designed to circle, as shown in Figure 5.
According to Fig. 6, the opening 15 ' in the agitator disk 14 can have and is similar to the trapezoidal cross section of outwards widening.For the one side closed depressed part 30 ' in the corresponding agitator disk 17 ' also is so, as shown in Figure 7.
Working method is as follows:
In the course of the work, with grinding aid medium 31 grinding chamber 10 is filled into considerable degree.By abrasive material inlet 11, by means of unshowned pump with flowable abrasive material continuously pumping by grinding chamber 10.In described operation, agitator 6 is driven by drive motors 3 rotations.Abrasive material flows through grinding chamber 10 towards the direction of the abrasive material outlet that is formed by abrasive material outlet 13.Between this flow periods, abrasive material is subjected to the strong shear stress of grinding aid medium 31, thus the abrasive material particle is ground, and makes the abrasive material homogenising in addition.This process is carried out by this way, promptly respectively at the braided flow moving 32 that forms between the adjacent agitator disk 14 and between 14 and 17 as illustrated in fig. 1 and 2.They can be explained like this: the tangential momentum that abrasive material and grinding aid medium 31 are subjected at each agitator disk 14 or 14 and 17 contiguous places, strong than in the central region between two adjacent agitator disks 14,17.This makes the grinding aid medium 31 of contiguous each agitator disk 14 or 14 and 17 and abrasive material more strongly to outflow, and between two adjacent agitator disks 14 or in each central region between 14 and 17, grinding aid medium 31 and abrasive material inwardly reflux towards shaft 5.This grinding and homogenising process be between all agitator disks 14 and all identical between 14 and 17 because these agitator disks 14,17 identical apart from a with a ', diameter b is identical with b ' and rotating speed is identical.One side closed depressed part 30 is guaranteed described braided flow moving 32 between last agitator disk 17 ' and the adjacent agitator disk 14, and also the braided flow moving 32 with above-mentioned is identical.
Flow through the amount of the abrasive material of grinding chamber 10 corresponding to time per unit, stack one axial flow of passing grinding chamber 10 on braided flow moving 32.At contiguous shaft 5 places, the shunting of abrasive material and grinding aid medium 31 is flowed out from last braided flow between penult agitator disk 14 and the agitator disk 17 moving 32, passes passage 22 in the agitator disk 17 and enters in the interior separation chamber 21 of cage 19.The summation of these shuntings corresponds essentially to the volume flow of importing and pass through the abrasive material of abrasive material outlet 13 discharges by abrasive material inlet 11.These shuntings are radially also tangentially quickened to extrinsic deflection with respect to axis 16 in the gap 28 that the midfeather 27 by agitator disk 17 and rotation forms.Because the rotation of agitator disk 17 and midfeather 27, abrasive material and grinding aid medium 31 are that outwards pointed in gap 28 once more, extra high acceleration, and be wherein especially true for grinding aid medium 31 and possible still residual thick especially abrasive material particle.These abrasive material particles and grinding aid medium 31 are by the penetrating part 20 outwards centrifugations of quilt of cage 19.Therefore, grinding aid medium 31 and the rough lapping composition granule that fully do not grind turn back in the braided flow moving 32 again.Do not pass the flow direction deflection vertically and in the periphery 27b of midfeather 27 and the annular gap 27a between the cage 16 of that cage 19 centrifugations are gone out, abrasive material by screen device 23 discharges through grinding.Therefore the separation of grinding aid medium 31 and possible rough lapping composition granule is only carried out in separator 25.
, agitator disk relevant with the formation of braided flow moving 32 in order to illustrate 14,17,17 ' diameter b and the relation between their axial distance a, a ' should be pointed out that to have defined so-called angle of departure α or β.Angle of departure α or β are formed between two lines 33 and 34.Line 33 extends to the outward flange 36 of adjacent agitator disk 14 from the inner end on shaft 5 35 of agitator disk 14.Another line 34 is 16 the lines of paralleling to the axis.Angle of departure β is last agitator disk 17 or 17 ' and the angle between its nearest agitator disk 14.Moving 32 in order to form described braided flow, the angle of departure should satisfy: 30 °＜α＜60 ° and 30 °＜β＜60 °.In other words, even this means under distance a and the unequal situation of a ', last agitator disk 17 or 17 ' and the most contiguous agitator disk 14 between angle of departure β make that also can form described braided flow moves 32.
Although agitation grinder all has the axis 16 of level in described each embodiment, the present invention also can be applicable to have the agitation grinder of vertical axis naturally.
At last, the passage 22 in the agitator disk 17,17 ' can be designed to active transportation (
), as only shown in Figure 8.The wall portion 37 of passage is not 16 extensions of paralleling to the axis in this case, but--promptly on the direction of midfeather 27--extends on γ ground at angle with the parallel lines of axis 16 against rotation direction 38 and on the flow direction 39.Therefore, abrasive material and grinding aid medium 31 are drawn in the passage 22 especially doughtily and pass this passage and be pushed in the gap 28.Therefore, the in fact approximate total volumetric flow rate that is equivalent to import and pass through the abrasive material volume flow of abrasive material outlet 13 discharges of the total amount of shunting above-mentioned by abrasive material inlet 11, wherein in this zone, because there is braided flow moving 32, therefore the grinding aid medium 31 that has normal concentration in abrasive material, described grinding aid medium are also carried along passage 22 together.In the above-described embodiments, angle γ satisfies: γ=0 °.Embodiment for the reality of the passage 22 of active transportation satisfies: 0 °＜γ＜45 °.
Claims (9)
1. agitation grinder has:
-grinding container (2),
--described grinding container surrounds a grinding chamber (10),
--abrasive material inlet (11) at one end portion feeds in the described grinding container,
--abrasive material outlet (13) in the other end from described grinding container pass-out, and
--described grinding container receives assistant research fellow's medium (31),
-being arranged in the agitator (6) in the described grinding chamber (10), described agitator (6) has:
--have shaft axis (16), that can be driven in rotation (5),
--diameter is last agitator disk (17,17 ') of b ', and described last agitator disk is installed in described shaft (5) and goes up and be adjacent to described abrasive material outlet (13), and
--diameter is the agitator disk (14) of b, and described agitator disk is installed in described shaft (5) and goes up, is arranged on the axial upstream place of described last agitator disk (17,17 '), separates each other with axial distance a,
--upstream agitator disk (14) wherein adjacent one another are is determined an angle of departure α, and described last agitator disk (17,17 ') is determined an angle of departure β with adjacent agitator disk (14),
--wherein each angle of departure α, β are by an agitator disk (14,17,17 ') the line (33) between the outward flange (36) of a radial inner end (35) on the described shaft (5) and an adjacent agitator disk (14) forms with the line (34) that is parallel to described axis (16), and
--wherein satisfy: 30 °＜α＜60 °,
-being arranged in the grinding aid media separating apparatus (25) of described abrasive material outlet (13) upstream, described separator has:
--be arranged in the tight upstream of described abrasive material outlet (13) screen device (23) and
--surround the cage (19) of described screen device (23) on described axis (16) direction, described cage and described last agitator disk (17,17 ') are fixedly connected and have radially a penetrating part (20), and
-being adjacent to described shaft to be formed on passage (22) in described last agitator disk (17,17 ') (5), described passage feeds in the separator (25),
It is characterized in that,
Angle of departure β between described last agitator disk (17,17 ') and the adjacent agitator disk (14) also satisfies: 30 °＜β＜60 °,
In described separator (25), at described last agitator disk (17,17 ') and between the described screen device (23) be furnished with midfeather (27,27 '), described midfeather (27,27 ') is anti-to be connected with described agitator (6) rotationally and to extend at least diameter d above described screen device (23).
2. agitation grinder according to claim 1 is characterized in that, the relation for the diameter d of the diameter c of described midfeather (27,27 ') and described screen device (23) satisfies: c 〉=d.
3. agitation grinder according to claim 2 is characterized in that, described midfeather (27,27 ') extends to closely near described cage (19) always.
4. agitation grinder according to claim 1 is characterized in that, is provided with distance piece (29) between described midfeather (27 ') and described last agitator disk (17).
5. agitation grinder according to claim 1 is characterized in that, described last agitator disk (17,17 ') apart from next-door neighbour's agitator disk (14) apart from a ' equal all upstream agitator disk (14) each other apart from a.
6. agitation grinder according to claim 1, it is characterized in that, described upstream agitator disk (14) is provided with opening (15), and described last agitator disk (17 ') is provided with depressed part (30) this last agitator disk on a side of described adjacent agitator disk (14).
7. agitation grinder according to claim 6 is characterized in that, described depressed part (30) has and the identical cross section of described opening (15).
8. agitation grinder according to claim 1 is characterized in that, the diameter b of all agitator disks (14,17), b ' equate.
9. agitation grinder according to claim 1 is characterized in that, described passage (22) is designed to extend towards midfeather (27,27 ') along the rotation direction of described shaft (5) (38).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2007/007279 WO2009024159A1 (en) | 2007-08-17 | 2007-08-17 | Stirrer mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101801532A true CN101801532A (en) | 2010-08-11 |
| CN101801532B CN101801532B (en) | 2012-06-27 |
Family
ID=39262687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007801002746A Expired - Fee Related CN101801532B (en) | 2007-08-17 | 2007-08-17 | Stirrer mill |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2178643B1 (en) |
| CN (1) | CN101801532B (en) |
| AT (1) | ATE495819T1 (en) |
| DE (1) | DE502007006343D1 (en) |
| ES (1) | ES2356855T3 (en) |
| WO (1) | WO2009024159A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103056011A (en) * | 2013-01-24 | 2013-04-24 | 陈波 | Forced bi-directional vertical circulation grinding system |
| CN103657800A (en) * | 2013-12-19 | 2014-03-26 | 占天义 | Stirring type grinding system |
| CN104722367A (en) * | 2013-12-20 | 2015-06-24 | 无锡新光粉体科技有限公司 | Medium mixing type wet grinding dispersing device |
| CN107735182A (en) * | 2016-06-14 | 2018-02-23 | 芦泽精美技术株式会社 | Medium circulation formula pulverizer |
| CN107952530A (en) * | 2016-10-18 | 2018-04-24 | 威利A.巴霍芬公司 | Blender formula ball mill |
| CN112958230A (en) * | 2021-03-14 | 2021-06-15 | 上海琥崧智能科技股份有限公司 | Novel high-efficient grinding of disk spacer block device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PE20120237A1 (en) | 2008-12-19 | 2012-04-14 | Xstrata Technology Pty Ltd | GRIPPING WEAR MILL |
| DE102010049827A1 (en) * | 2010-10-27 | 2012-05-03 | Netzsch-Feinmahltechnik Gmbh | stirred ball mill |
| CN103657802B (en) * | 2013-12-31 | 2016-08-17 | 深圳市博亿化工机械有限公司 | Stirring-type lapping device |
| DE102021123408A1 (en) | 2021-09-09 | 2023-03-09 | Netzsch-Feinmahltechnik Gmbh | agitator mill |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5333804A (en) * | 1993-08-20 | 1994-08-02 | Premier Mill Corp. | Agitator mill |
| JP3800556B2 (en) * | 1994-04-11 | 2006-07-26 | マウント アイザ マインズ リミテッド | Attrition mill and method for selecting particles in slurry |
| DE4412408C2 (en) * | 1994-04-11 | 2003-03-20 | Netzsch Erich Holding | agitating mill |
| DE4432203A1 (en) | 1994-09-09 | 1996-03-14 | Evv Vermoegensverwaltungs Gmbh | Agitator mill |
-
2007
- 2007-08-17 WO PCT/EP2007/007279 patent/WO2009024159A1/en active Application Filing
- 2007-08-17 CN CN2007801002746A patent/CN101801532B/en not_active Expired - Fee Related
- 2007-08-17 EP EP07801726A patent/EP2178643B1/en not_active Not-in-force
- 2007-08-17 ES ES07801726T patent/ES2356855T3/en active Active
- 2007-08-17 DE DE502007006343T patent/DE502007006343D1/en active Active
- 2007-08-17 AT AT07801726T patent/ATE495819T1/en active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103056011A (en) * | 2013-01-24 | 2013-04-24 | 陈波 | Forced bi-directional vertical circulation grinding system |
| CN103056011B (en) * | 2013-01-24 | 2016-05-11 | 陈波 | A kind of enforced bidirectional vertical circulation grinding system |
| CN103657800A (en) * | 2013-12-19 | 2014-03-26 | 占天义 | Stirring type grinding system |
| CN104722367A (en) * | 2013-12-20 | 2015-06-24 | 无锡新光粉体科技有限公司 | Medium mixing type wet grinding dispersing device |
| CN107735182A (en) * | 2016-06-14 | 2018-02-23 | 芦泽精美技术株式会社 | Medium circulation formula pulverizer |
| CN107952530A (en) * | 2016-10-18 | 2018-04-24 | 威利A.巴霍芬公司 | Blender formula ball mill |
| CN107952530B (en) * | 2016-10-18 | 2019-11-08 | 威利A.巴霍芬公司 | Blender formula ball mill |
| CN112958230A (en) * | 2021-03-14 | 2021-06-15 | 上海琥崧智能科技股份有限公司 | Novel high-efficient grinding of disk spacer block device |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2178643B1 (en) | 2011-01-19 |
| ES2356855T3 (en) | 2011-04-13 |
| DE502007006343D1 (en) | 2011-03-03 |
| WO2009024159A1 (en) | 2009-02-26 |
| ATE495819T1 (en) | 2011-02-15 |
| EP2178643A1 (en) | 2010-04-28 |
| CN101801532B (en) | 2012-06-27 |
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Granted publication date: 20120627 Termination date: 20200817 |