CN104533458A - Clearing dredging system of mining concrete delivery main line - Google Patents
Clearing dredging system of mining concrete delivery main line Download PDFInfo
- Publication number
- CN104533458A CN104533458A CN201410814060.7A CN201410814060A CN104533458A CN 104533458 A CN104533458 A CN 104533458A CN 201410814060 A CN201410814060 A CN 201410814060A CN 104533458 A CN104533458 A CN 104533458A
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- China
- Prior art keywords
- main line
- mining
- air inlet
- high pressure
- pressure gas
- 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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- 239000004567 concrete Substances 0.000 title claims abstract description 31
- 238000005065 mining Methods 0.000 title claims abstract description 28
- 238000004140 cleaning Methods 0.000 claims description 29
- 239000011449 brick Substances 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 description 7
- 239000003245 coal Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000005086 pumping Methods 0.000 description 4
- 238000003745 diagnosis Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 241000406668 Loxodonta cyclotis Species 0.000 description 2
- 238000010009 beating Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2209/00—Details of machines or methods for cleaning hollow articles
- B08B2209/02—Details of apparatuses or methods for cleaning pipes or tubes
- B08B2209/027—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces
- B08B2209/032—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces by the mechanical action of a moving fluid
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
Abstract
The invention provides a clearing dredging system of a mining concrete delivery main line. The problem that an existing pipeline dredging operation is complicated is solved. The clearing dredging system comprises a delivery pipeline, wherein a plurality of high-pressure air dredging units are connected to the delivery pipeline in series and are provided with main pipelines communicated with the delivery pipeline, air inlet branch pipelines branched from the main pipelines and connected with a high-pressure air supply source, control valves are arranged on the air inlet branch pipelines, pressure transmitters are attached to the inner walls of the main pipelines and connected with a record analyzer through circuits, a vibrating mechanism is arranged outside the main pipelines and comprises a pneumatic piston cylinder, the pneumatic piston cylinder, is in driving connection with a vibrating frame, the vibrating frame surrounds the peripheries of the main pipelines, air ports formed in two ends of the pneumatic piston cylinder are connected with a reversing valve through main air channels, branch air channels are branched from the main air channels and act on the elastic switchover end of the reversing valve, and the reversing valve is connected with the high-pressure air supply source through an air inlet pipeline and an air return pipeline. The clearing dredging system is high in automation degree and capable of saving time and labor.
Description
Technical field
The invention belongs to conveying route technical field, relate to one and utilize high pressure gas pass blocking to clear up structure, particularly a kind of cleaning unimpeded system of mining delivering concrete main line.
Background technology
In mine, tunnel support construction, Concrete Pumping Technology is widely used, and along with the development of concrete pumping technique, pumping of concrete can reach long distance, large discrepancy in elevation conveying.
China is a big coal country, and for coal production provides effective technical guarantee, the safe working realizing colliery is the objective demand of China's economic development.In the headwork of colliery, bolt-spary supports is the important procedure that coal production is built, and along with dry pressure spray process is disabled, wet shotcreting technique then becomes underground coal mine shotcrete flow chart the most general.In Cemented filling, especially long distance delivery process, if batching and misoperation, cause the situation of line clogging to happen occasionally, except easily causing the damage of equipment, time serious, even have influence on the quality of support engineering.
How ensureing that colliery wet shotcreting pipeline carries out safe and efficient conveying, is a difficult problem urgently to be resolved hurrily in current wet-spraying support of coal mine engineering.Often occur due to this problem and be difficult to control, and then having a strong impact on the development of pumping construction in engineering and popularization.
Summary of the invention
The object of the invention is to there are the problems referred to above for existing technology, propose a kind of by pressure-sensing diagnosis plugging position, coordinated the cleaning unimpeded system of the mining delivering concrete main line of high pressure gas dredge blockage by vibration.
Object of the present invention realizes by following technical proposal: the cleaning unimpeded system of mining delivering concrete main line, comprise transfer pipeline, one end of described transfer pipeline connects power source, described transfer pipeline is connected in series some high pressure gas unimpeded unit, described high pressure gas unimpeded unit has the main line be connected with transfer pipeline, described main line top set goes out air inlet branch road, described air inlet branch road connects high pressure gas supply source, described air inlet branch road arranges control valve, the inwall of described main line is pasted with pressure transmitter, described pressure transmitter is by circuit linkage record analyzer, the outer setting vibrating mechanism of described main line, described vibrating mechanism comprises air rammer cylinder, described air rammer cylinder drives and connects vibrating frame, described vibrating frame collar is in main line periphery, the blow vent at described air rammer cylinder two ends connects a reversal valve by main airway, described main airway top set goes out branch airway, described branch airway acts in the elasticity switch terminal of reversal valve, described reversal valve is connected high pressure gas supply source by air inlet pipeline with return line.
In the cleaning unimpeded system of this mining delivering concrete main line, by evenly arranging multiple high pressure gas unimpeded unit in the elephant trunk of long distance, thus overall conveying route is separated into some sections.Pressure transmitter in the main line of whole high pressure gas unimpeded unit, forms plugging with recorder analyser and diagnoses mechanism.The pressure signal detected is transferred to recorder analyser by the pressure transmitter being arranged in pipeline, and pressure raises suddenly and be plugging pipeline section between two high pressure gas unimpeded unit that pressure reduces suddenly; Behind diagnosis plugging position, open the control valve of relevant position, make high pressure gas enter in transfer pipeline by air inlet branch road; High pressure gas enters reversal valve by air inlet pipeline simultaneously, and the paralleled path gear through reversal valve enters air rammer cylinder lower chambers, and then promotes vibrating frame moves to pat the downside of main line; Air pressure increases, and high pressure gas enters branch airway by main airway and acts in the elasticity switch terminal of reversal valve side, causes reversal valve gear switch; High pressure gas enters air rammer cylinder upper chamber through the line passing gear of reversal valve, and then promotes vibrating frame and move down and pat the upside of main line; Air pressure increases, and high pressure gas enters branch airway by main airway and acts in the elasticity switch terminal of reversal valve opposite side, causes reversal valve gear switch; Back and forth pat vibration main line thus, the loose shake of the obstruction in this section of transfer pipeline is fallen, is blown away by high pressure gas further and dredge; After completing the block clearing operation of this section of transfer pipeline, closed control valve stops high pressure gas conveying, stops vibration.
In the cleaning unimpeded system of above-mentioned mining delivering concrete main line, described vibrating frame has the clappers that shake that two panels is oppositely arranged, two panels shake clappers side connected by drive rod, described main line two panels shake clappers between, described drive rod penetrates air rammer cylinder and its piston rod is connected.Air rammer cylinder drives its piston rod to move back and forth, the drive rod of synchronous drive vibrating frame moves back and forth, cause the clappers that shake being positioned at two ends alternately to pat the outer wall of main line, cause main line produce vibration and the obstruction shake in it is fallen, and then blown away by high pressure gas.
In the cleaning unimpeded system of above-mentioned mining delivering concrete main line, described in shake clappers medial surface on be pasted with the bat brick that shakes, described in shake clap brick go out arc face towards indent on the side of main line.When arc face increases beating and the contact area of main line outer wall, to transmit larger vibration force.
In the cleaning unimpeded system of above-mentioned mining delivering concrete main line, described air inlet branch road is communicated with wireway, described wireway connects reversal valve by above-mentioned air inlet pipeline.Utilize wireway the high pressure gas in air inlet branch road can be sent into reversal valve, with the reciprocating power of the switching power and pneumatic piston rod that provide reversal valve.Control the break-make of wireway to reversal valve supply high pressure gas by control valve simultaneously.
In the cleaning unimpeded system of above-mentioned mining delivering concrete main line, described control valve is electromagnetic valve, and described recorder analyser electricly connects electromagnetic valve.When recorder analyser analyzes certain section of transfer pipeline generation blocking, the electromagnetic valve of electrical autocontrol relevant position is opened, and passes into high pressure gas and carries out block clearing operation.
In the cleaning unimpeded system of above-mentioned mining delivering concrete main line, described control valve is butterfly valve.When recorder analyser analyzes certain section of transfer pipeline generation blocking, the butterfly valve of manual operation relevant position is opened, and passes into high pressure gas and carries out block clearing operation.
In the cleaning unimpeded system of above-mentioned mining delivering concrete main line, the two ends of described main line arrange pipe clamp or flange.The interface tube at main line two ends is formed by pipe clamp or flange and transfer pipeline and is tightly connected.
In the cleaning unimpeded system of above-mentioned mining delivering concrete main line, described transfer pipeline has bending section, and described high pressure gas unimpeded unit is positioned at the two ends of bending section.The pipeline of curved shape easily produces blocking, therefore arranges high pressure gas unimpeded unit at its two ends, is conducive to detecting in time it, promotes the effect of unimpeded cleaning.
Compared with prior art, the cleaning unimpeded system of this mining delivering concrete main line realizes monitoring plugging position automatically, and monitoring accurately, in time; Utilizing vibration loose metal and high pressure gas to blow to match, effectively complete unimpeded cleaning operation, and without the need to dismantling main line body, it is time saving and energy saving to have, reduce working strength, promote operating efficiency, automaticity is high, effectively safeguards the features such as transfer pipeline.
Accompanying drawing explanation
Fig. 1 is the structural representation of the cleaning unimpeded system mesohigh gas unimpeded unit of this mining delivering concrete main line.
Fig. 2 is the structural representation of vibrating mechanism in the cleaning unimpeded system of this mining delivering concrete main line.
Fig. 3 is the integral installation distribution structure schematic diagram of the cleaning unimpeded system of this mining delivering concrete main line.
In figure, 1, transfer pipeline; 2, power source; 3, high pressure gas unimpeded unit; 3a, main line; 3b, air inlet branch road; 3c, control valve; 3d, wireway; 3e, vibrating mechanism; 3e1, air rammer cylinder; 3e2, vibrating frame; 3e3, shake bat brick; 3e4, main airway; 3e5, branch airway; 3e6, reversal valve; 4, pressure transmitter; 5, recorder analyser.
Detailed description of the invention
Be below specific embodiments of the invention and by reference to the accompanying drawings, technical scheme of the present invention is further described, but the present invention be not limited to these embodiments.
As shown in Figure 1, Figure 2 and Figure 3, the cleaning unimpeded system of this mining delivering concrete main line, comprises transfer pipeline 1, and one end of transfer pipeline 1 connects power source 2, transfer pipeline 1 is connected in series some high pressure gas unimpeded unit 3.
High pressure gas unimpeded unit 3 has the main line 3a be connected with transfer pipeline 1, and main line 3a top set goes out air inlet branch road 3b, and air inlet branch road 3b connects high pressure gas supply source, and air inlet branch road 3b arranges control valve 3c.The inwall of main line 3a is pasted with pressure transmitter 4, this pressure transmitter 4 is by circuit linkage record analyzer 5, and the pressure transmitter 4 in the main line 3a of whole high pressure gas unimpeded unit 3, forms plugging with recorder analyser 5 and diagnose mechanism.
The outer setting vibrating mechanism 3e of main line 3a, vibrating mechanism 3e comprises air rammer cylinder 3e1, and air rammer cylinder 3e1 drives and connects vibrating frame 3e2.Vibrating frame 3e2 collar is in main line 3a periphery, and vibrating frame 3e2 has the clappers that shake that two panels is oppositely arranged, two panels shake clappers side connected by drive rod, main line 3a two panels shake clappers between, drive rod penetrates air rammer cylinder 3e1 and its piston rod is connected.Shake clappers medial surface on be pasted with to shake and clap brick 3e3, this shakes and claps brick 3e3 and go out arc face towards indent on the side of main line 3a.When arc face increases beating and the contact area of main line 3a outer wall, to transmit larger vibration force.
The blow vent at air rammer cylinder 3e1 two ends connects a reversal valve 3e6 by two main airway 3e4, every bar main airway 3e4 all branches out branch airway 3e5, article two, branch airway 3e5 acts in two elasticity switch terminal of reversal valve 3e6 one by one, and reversal valve 3e6 is connected high pressure gas supply source by air inlet pipeline with return line.
Air inlet branch road 3b is communicated with wireway 3d, and wireway 3d connects reversal valve 3e6 by air inlet pipeline.Utilize wireway 3d the high pressure gas in air inlet branch road 3b can be sent into reversal valve 3e6, to provide the reciprocating power of the switching power of reversal valve 3e6 and pneumatic piston rod 3e1.Control the break-make of wireway 3d to reversal valve 3e6 supply high pressure gas by control valve 3c simultaneously.
The two ends of main line 3a arrange pipe clamp or flange.The interface tube at main line 3a two ends is formed by pipe clamp or flange and transfer pipeline 1 and is tightly connected.
In a kind of scheme, control valve 3c is electromagnetic valve, and recorder analyser 5 electricly connects electromagnetic valve.When recorder analyser 5 analyzes certain section of transfer pipeline 1 generation blocking, the electromagnetic valve of electrical autocontrol relevant position is opened, and passes into high pressure gas and carries out block clearing operation.In another kind of scheme, control valve 3c is butterfly valve.When recorder analyser 5 analyzes certain section of transfer pipeline 1 generation blocking, the butterfly valve of manual operation relevant position is opened, and passes into high pressure gas and carries out block clearing operation.
Transfer pipeline 1 has bending section, and described high pressure gas unimpeded unit 3 is positioned at the two ends of bending section.The pipeline of curved shape easily produces blocking, therefore arranges high pressure gas unimpeded unit 3 at its two ends, is conducive to detecting in time it, promotes the effect of unimpeded cleaning.
In the cleaning unimpeded system of this mining delivering concrete main line, by evenly arranging multiple high pressure gas unimpeded unit 3 in the elephant trunk of long distance, thus overall conveying route is separated into some sections.The pressure signal detected is transferred to recorder analyser 5 by the pressure transmitter 4 being arranged in pipeline, and pressure raises suddenly and be plugging pipeline section between two high pressure gas unimpeded unit 3 that pressure reduces suddenly; Behind diagnosis plugging position, open the control valve 3c of relevant position, make high pressure gas enter in transfer pipeline 1 by air inlet branch road 3b; High pressure gas enters reversal valve 3e6 by air inlet pipeline simultaneously, paralleled path gear through reversal valve 3e6 enters air rammer cylinder 3e1 lower chambers, by promoting drive rod drive body vibration frame 3e2 moves, the clappers that shake being positioned at bottom side are caused to be patted the downside of main line 3a; Air pressure increases, and high pressure gas enters branch airway 3e5 by main airway 3e4 and acts in the elasticity switch terminal of reversal valve 3e6 side, causes reversal valve 3e6 gear switch; High pressure gas enters air rammer cylinder 3e1 upper chamber through the line passing gear of reversal valve 3e6, driving body vibration frame 3e2 to move down, causing the clappers that shake being positioned at top side to be patted the upside of main line 3a by promoting drive rod; Air pressure increases, and high pressure gas enters branch airway 3e5 by main airway 3e4 and acts in the elasticity switch terminal of reversal valve 3e6 opposite side, causes reversal valve 3e6 gear switch; Vibrating frame 3e2 moves back and forth thus, make the clappers that shake at two ends alternately pat the outer wall of main line 3a, and then the loose shake of obstruction in this section of transfer pipeline 1 is fallen, and is blown away further and dredge by high pressure gas; After completing the block clearing operation of this section of transfer pipeline 1, closed control valve 3c stops high pressure gas conveying, stops vibration.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Although more employ transfer pipeline 1 herein; Power source 2; High pressure gas unimpeded unit 3; Main line 3a; Air inlet branch road 3b; Control valve 3c; Wireway 3d; Vibrating mechanism 3e; Air rammer cylinder 3e1; Vibrating frame 3e2; Shake and clap brick 3e3; Main airway 3e4; Branch airway 3e5; Reversal valve 3e6; Pressure transmitter 4; Term such as recorder analyser 5 grade, but do not get rid of the possibility using other term.These terms are used to be only used to describe and explain essence of the present invention more easily; The restriction that they are construed to any one additional is all contrary with spirit of the present invention.
Claims (8)
1. the cleaning unimpeded system of mining delivering concrete main line, comprise transfer pipeline, one end of described transfer pipeline connects power source, described transfer pipeline is connected in series some high pressure gas unimpeded unit, it is characterized in that, described high pressure gas unimpeded unit has the main line be connected with transfer pipeline, described main line top set goes out air inlet branch road, described air inlet branch road connects high pressure gas supply source, described air inlet branch road arranges control valve, the inwall of described main line is pasted with pressure transmitter, described pressure transmitter is by circuit linkage record analyzer, the outer setting vibrating mechanism of described main line, described vibrating mechanism comprises air rammer cylinder, described air rammer cylinder drives and connects vibrating frame, described vibrating frame collar is in main line periphery, the blow vent at described air rammer cylinder two ends connects a reversal valve by main airway, described main airway top set goes out branch airway, described branch airway acts in the elasticity switch terminal of reversal valve, described reversal valve is connected high pressure gas supply source by air inlet pipeline with return line.
2. the cleaning unimpeded system of mining delivering concrete main line according to claim 1, it is characterized in that, described vibrating frame has the clappers that shake that two panels is oppositely arranged, two panels shake clappers side connected by drive rod, described main line shakes between clappers in two panels, and described drive rod penetrates air rammer cylinder and its piston rod is connected.
3. the cleaning unimpeded system of mining delivering concrete main line according to claim 2, is characterized in that, described in shake clappers medial surface on be pasted with the bat brick that shakes, described in shake clap brick go out arc face towards indent on the side of main line.
4. the cleaning unimpeded system of mining delivering concrete main line according to claim 1, is characterized in that, described air inlet branch road is communicated with wireway, and described wireway connects reversal valve by above-mentioned air inlet pipeline.
5. the cleaning unimpeded system of mining delivering concrete main line according to claim 1, is characterized in that, described control valve is electromagnetic valve, and described recorder analyser electricly connects electromagnetic valve.
6. the cleaning unimpeded system of mining delivering concrete main line according to claim 1, is characterized in that, described control valve is butterfly valve.
7. the cleaning unimpeded system of mining delivering concrete main line according to any one of claim 1 to 6, is characterized in that, the two ends of described main line arrange pipe clamp or flange.
8. the cleaning unimpeded system of mining delivering concrete main line according to any one of claim 1 to 6, it is characterized in that, described transfer pipeline has bending section, and described high pressure gas unimpeded unit is positioned at the two ends of bending section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410814060.7A CN104533458B (en) | 2014-12-23 | 2014-12-23 | The cleaning unimpeded system of mining delivering concrete main line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410814060.7A CN104533458B (en) | 2014-12-23 | 2014-12-23 | The cleaning unimpeded system of mining delivering concrete main line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104533458A true CN104533458A (en) | 2015-04-22 |
| CN104533458B CN104533458B (en) | 2017-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410814060.7A Expired - Fee Related CN104533458B (en) | 2014-12-23 | 2014-12-23 | The cleaning unimpeded system of mining delivering concrete main line |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113020013A (en) * | 2021-03-11 | 2021-06-25 | 中铁隧道局集团有限公司 | Shield constructs machine knife dish mud cake excitation cleaning device |
| CN113983278A (en) * | 2021-10-28 | 2022-01-28 | 中建西部建设建材科学研究院有限公司 | Stirring station waste slurry pipeline anti-blocking system |
| WO2023004751A1 (en) * | 2021-07-30 | 2023-02-02 | 上海城建物资有限公司 | Conveying pipe cleaning method and device |
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| CN85102392A (en) * | 1985-04-01 | 1987-01-31 | 康诺科有限公司 | Fluid vibration apparatus |
| CN2444059Y (en) * | 2000-01-01 | 2001-08-22 | 郑州康达支护技术有限公司 | Rator type concrete wet blasting machine |
| CN2475712Y (en) * | 2001-04-26 | 2002-02-06 | 陆鸣 | Pneumatic type drap chute block-warning device |
| CN201373242Y (en) * | 2009-02-25 | 2009-12-30 | 扬州柳工建设机械有限公司 | Pressure measuring device for conveying pipeline of concrete conveying pump |
| CN202219929U (en) * | 2011-07-08 | 2012-05-16 | 山东省电力学校 | Plugged coal removing device of coal collecting bucket |
| CN203442488U (en) * | 2013-08-27 | 2014-02-19 | 李品华 | Dilute phosphoric acid conveying device |
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2014
- 2014-12-23 CN CN201410814060.7A patent/CN104533458B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85102392A (en) * | 1985-04-01 | 1987-01-31 | 康诺科有限公司 | Fluid vibration apparatus |
| CN2444059Y (en) * | 2000-01-01 | 2001-08-22 | 郑州康达支护技术有限公司 | Rator type concrete wet blasting machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113020013A (en) * | 2021-03-11 | 2021-06-25 | 中铁隧道局集团有限公司 | Shield constructs machine knife dish mud cake excitation cleaning device |
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| Publication number | Publication date |
|---|---|
| CN104533458B (en) | 2017-08-11 |
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Granted publication date: 20170811 Termination date: 20171223 |