CN106736232B - Method for repairing impeller of desulfurization slurry circulating pump - Google Patents
Method for repairing impeller of desulfurization slurry circulating pump Download PDFInfo
- Publication number
- CN106736232B CN106736232B CN201611249854.9A CN201611249854A CN106736232B CN 106736232 B CN106736232 B CN 106736232B CN 201611249854 A CN201611249854 A CN 201611249854A CN 106736232 B CN106736232 B CN 106736232B
- Authority
- CN
- China
- Prior art keywords
- impeller
- repairing
- namely
- agent
- circulating pump
- 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.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
- B23P6/002—Repairing turbine components, e.g. moving or stationary blades, rotors
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a method for repairing a circulating pump impeller of a desulfurization slurry pump, which is characterized in that an impeller and a high-molecular silicon carbide ceramic healant material layer are connected together by inserting a groove arranged on the impeller layer into the high-molecular silicon carbide ceramic healant material layer and inserting a buckle arranged on the high-molecular silicon carbide ceramic healant material layer into the impeller layer, so that the high-molecular silicon carbide ceramic healant material layer and the impeller layer are higher in connection strength, the falling off of the high-molecular silicon carbide ceramic healant material layer is avoided, the service life of the high-molecular silicon carbide ceramic healant material on the impeller is prolonged, and the corrosion resistance and the wear resistance of the impeller of the desulfurization slurry pump are improved; the service life is prolonged, and the corrosion resistance and the abrasion resistance are enhanced.
Description
Technical Field
The invention relates to the field of machining, in particular to a method for repairing a circulating pump impeller of desulfurization slurry.
Background
The surface of an impeller of a desulfurization slurry circulating pump of a thermal power plant is damaged by abrasion, corrosion, cavitation and the like under the long-term sulfuric acid corrosion, gradually worn blades are thinned, pits are corroded, and finally gaps appear, the matching surface of the impeller and the pump is also damaged, the efficiency of the pump is seriously reduced, the pits and the gaps on the surface of the impeller increase the resistance during overflowing, the gaps of the blades can generate a large amount of vortex, the flow is reduced, the energy is consumed, the impeller needs to be replaced or repaired after generally running for one to two years due to the severe working conditions of a slurry pump, the impeller is special in material and expensive in manufacturing cost, and a lot of impellers are manufactured
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for repairing a circulating pump impeller of desulfurization slurry.
The invention is realized by the following technical scheme.
The invention provides a method for repairing a circulating pump impeller of desulfurization slurry, which comprises the following steps:
a) removing the corroded surface, and cutting the depth of the precise matching surface of the impeller by using a lathe to be at least 3 mm;
b. repairing the blade of the impeller, and welding a stainless steel screen plate at the worn edge of the blade for repairing;
c. drilling a plurality of holes on the impeller, and then removing oil stains and other organic matters on the surface of the impeller by using an oil stain cleaning agent;
d. increasing the surface roughness, and carrying out sand blasting on the impeller to ensure that the surface roughness of the impeller reaches 10-50 um;
e. smearing a repairing agent, namely smearing a wear-resistant repairing agent with the thickness of 3-10 mm on the surface of the impeller;
f. drying the wear-resisting agent, putting the impeller into a drying oven, and carrying out heat treatment at the temperature of 60 ℃ for 2-6 hours;
g. recovering the size, namely processing the precise matching surface of the impeller by using a lathe, and cutting off redundant ceramic repairing agent materials to recover the size of the precise matching surface;
h. surface finish treatment, namely uniformly coating composite ceramic fine particles on the surface of the impeller;
i. and dynamic balance treatment, namely performing dynamic balance experiment on the impeller to eliminate the risk of vibration after operation.
And a step a of cutting a plurality of grooves on the impeller fine matching surface after the corroded surface is removed.
In the step e, when the repairing agent is coated, the coating thickness of the part with serious impeller abrasion is 5-10 mm, and the coating thickness of the part with light impeller abrasion is 3-5 mm.
The wear-resistant repairing agent is a SICONit ceramic material.
The turning process in the step g adopts a diamond cutter; firstly, roughly turning, namely using a 75-degree offset tool, adopting a front angle of the offset tool to be 10-12 degrees at a rear angle of 4-6 degrees, roughly turning and leaving 2mm of allowance for finish turning, wherein the finish turning technological parameters are as follows: ap is 24mm, f is 0.18-0.25 mm/r, and Vc is 100-120 r/min. The method for repairing the impeller of the desulfurization slurry circulating pump comprises the following steps:
a) removing the corroded surface, and cutting the depth of the precise matching surface of the impeller by using a lathe to be at least 3 mm;
b. repairing the blade of the impeller, and welding a stainless steel screen plate at the worn edge of the blade for repairing;
c. drilling a plurality of holes on the impeller, and then removing oil stains and other organic matters on the surface of the impeller by using an oil stain cleaning agent;
d. increasing the surface roughness, and carrying out sand blasting on the impeller to ensure that the surface roughness of the impeller reaches 10-50 um;
e. smearing a repairing agent, namely smearing a wear-resistant repairing agent with the thickness of 3-10 mm on the surface of the impeller;
f. drying the wear-resisting agent, putting the impeller into a drying oven, and carrying out heat treatment at the temperature of 60 ℃ for 2-6 hours;
g. recovering the size, namely processing the precise matching surface of the impeller by using a lathe, and cutting off redundant ceramic repairing agent materials to recover the size of the precise matching surface;
h. surface finish treatment, namely uniformly coating composite ceramic fine particles on the surface of the impeller;
i. and dynamic balance treatment, namely performing dynamic balance experiment on the impeller to eliminate the risk of vibration after operation.
And a step a of cutting a plurality of grooves on the impeller fine matching surface after the corroded surface is removed.
In the step e, when the repairing agent is coated, the coating thickness of the part with serious impeller abrasion is 5-10 mm, and the coating thickness of the part with light impeller abrasion is 3-5 mm.
The wear-resistant repairing agent is a SICONit ceramic material.
The turning process in the step g adopts a diamond cutter; firstly, roughly turning, namely using a 75-degree offset tool, adopting a front angle of the offset tool to be 10-12 degrees at a rear angle of 4-6 degrees, roughly turning and leaving 2mm of allowance for finish turning, wherein the finish turning technological parameters are as follows: ap is 24mm, f is 0.18-0.25 mm/r, and Vc is 100-120 r/min.
The invention has the beneficial effects that: the impeller and the high-molecular silicon carbide ceramic healant material layer are inserted into the high-molecular silicon carbide ceramic healant material layer through the grooves arranged on the impeller layer and are connected with each other through the buckles arranged on the high-molecular silicon carbide ceramic healant material layer which are inserted into the impeller layer, so that the high-molecular silicon carbide ceramic healant material layer and the impeller layer are high in connection strength, the high-molecular silicon carbide ceramic healant material layer is prevented from falling off, the service life of the high-molecular silicon carbide ceramic healant material on the impeller is prolonged, and the corrosion resistance and the wear resistance of the desulfurization slurry pump impeller are improved; the service life is prolonged, and the corrosion resistance and the abrasion resistance are enhanced.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
The method for repairing the impeller of the desulfurization slurry circulating pump comprises the following steps:
a. removing the corroded surface, and cutting the depth of the precise matching surface of the impeller by using a lathe to be at least 3 mm;
b. repairing the blade of the impeller, and welding a stainless steel screen plate at the worn edge of the blade for repairing; considering that the edge of the blade is seriously worn, the place where the edge of the impeller is worn is welded by a stainless steel mesh plate, so that the reinforcing effect similar to reinforcing steel bars and concrete is achieved, and the repairing agent is convenient to attach.
c. Drilling a plurality of holes on the impeller, and then removing oil stains and other organic matters on the surface of the impeller by using an oil stain cleaning agent; the purpose is to lead the wear-resistant repairing agent (polymer silicon carbide ceramic repairing agent) material to be communicated through the hollow holes on the two surfaces of the blade, thereby playing a role of reinforcing similar to 'reinforcing steel bars and concrete'.
d. Increasing the surface roughness, and carrying out sand blasting on the impeller to ensure that the surface roughness of the impeller reaches 10 um-50 u m; the purpose of the sand blasting is mainly to remove rust or other corroded impurities on the surfaces of the screen cloth and the impeller. This is done mainly to enhance the adhesion of the next step of coating the wear-resistant repair agent (polymer silicon carbide ceramic) material.
e. Smearing a repairing agent, namely smearing a wear-resistant repairing agent with the thickness of 3-10 mm on the surface of the impeller;
f. drying the wear-resisting agent, putting the impeller into a drying oven, and carrying out heat treatment at the temperature of 60 ℃ for 2-6 hours;
g. recovering the size, namely processing the precise matching surface of the impeller by using a lathe, and cutting off redundant ceramic repairing agent materials to recover the size of the precise matching surface;
h. surface finish treatment, namely uniformly coating composite ceramic fine particles on the surface of the impeller;
i. and dynamic balance treatment, namely performing dynamic balance experiment on the impeller to eliminate the risk of vibration after operation.
And a step a of cutting a plurality of grooves on the impeller fine matching surface after the corroded surface is removed.
In the step e, when the repairing agent is coated, the coating thickness of the part with serious impeller abrasion is 5-10 mm, and the coating thickness of the part with light impeller abrasion is 3-5 mm. 3-5 mm machining allowance needs to be set for the impeller to be matched with the oblique conical surface accurately, and machining of a subsequent turning process is facilitated.
The wear-resistant repairing agent is a SICONit ceramic material.
The turning process in the step g adopts a diamond cutter; firstly, roughly turning, namely using a 75-degree offset tool, adopting a front angle of the offset tool to be 10-12 degrees at a rear angle of 4-6 degrees, roughly turning and leaving 2mm of allowance for finish turning, wherein the finish turning technological parameters are as follows: ap is 24mm, f is 0.18-0.25 mm/r, and Vc is 100-120 r/min. Example 1:
a) removing the corroded surface, and cutting the depth of the fine matching surface of the impeller by using a lathe to be 3 mm; cutting a plurality of grooves on the fine matching surface of the impeller after removing the corrosion surface
b. Repairing the blade of the impeller, and welding a stainless steel screen plate at the worn edge of the blade for repairing;
c. drilling a plurality of holes on the impeller, and then removing oil stains and other organic matters on the surface of the impeller by using an oil stain cleaning agent;
d. increasing the surface roughness, and carrying out sand blasting on the impeller to enable the surface roughness of the impeller to reach 10 um;
e. smearing a repairing agent, namely smearing a SICONit ceramic material wear-resistant repairing agent with the thickness of 3mm on the surface of the impeller;
f. drying the wear-resisting agent, putting the impeller into an oven, and carrying out heat treatment for 2 hours at the temperature of 60 ℃;
g. recovering the size, namely processing the precise matching surface of the impeller by using a lathe, and cutting off redundant ceramic repairing agent materials to recover the size of the precise matching surface; adopting a diamond knife; firstly, roughly turning, namely using a 75-degree offset tool, wherein the front angle of the offset tool adopts a 4-degree rear angle and adopts 10 degrees, roughly turning and leaving 2mm of allowance for finish turning, and the finish turning technological parameters are as follows: ap is 24mm, f is 0.18mm/r, and Vc is 100 r/min.
h. Surface finish treatment, namely uniformly coating composite ceramic fine particles on the surface of the impeller;
i. and dynamic balance treatment, namely performing dynamic balance experiment on the impeller to eliminate the risk of vibration after operation.
In the step e, when the repairing agent is coated, the coating thickness of the part with serious impeller abrasion is 5mm, and the coating thickness of the part with light impeller abrasion is 3 mm.
Example 2:
a) removing the corroded surface, and cutting the depth of the precise matching surface of the impeller by using a lathe to be 2 mm; cutting a plurality of grooves on the fine matching surface of the impeller after removing the corrosion surface
b. Repairing the blade of the impeller, and welding a stainless steel screen plate at the worn edge of the blade for repairing;
c. drilling a plurality of holes on the impeller, and then removing oil stains and other organic matters on the surface of the impeller by using an oil stain cleaning agent;
d. increasing the surface roughness, and carrying out sand blasting on the impeller to ensure that the surface roughness of the impeller reaches 30 um;
e. smearing a repairing agent, namely smearing a SICONit ceramic material wear-resistant repairing agent with the thickness of 5mm on the surface of the impeller;
f. drying the wear-resisting agent, putting the impeller into an oven, and carrying out heat treatment for 3 hours at the temperature of 60 ℃;
g. recovering the size, namely processing the precise matching surface of the impeller by using a lathe, and cutting off redundant ceramic repairing agent materials to recover the size of the precise matching surface; adopting a diamond knife; firstly, roughly turning, namely using a 75-degree offset tool, wherein the front angle of the offset tool adopts a 5-degree rear angle and adopts 11 degrees, roughly turning and leaving 2mm of allowance for finish turning, and the finish turning technological parameters are as follows: ap is 24mm, f is 0.2mm/r, and Vc is 110 r/min.
h. Surface finish treatment, namely uniformly coating composite ceramic fine particles on the surface of the impeller;
i. and dynamic balance treatment, namely performing dynamic balance experiment on the impeller to eliminate the risk of vibration after operation.
In the step e, when the repairing agent is coated, the coating thickness of the part with serious impeller abrasion is 7mm, and the coating thickness of the part with light impeller abrasion is 4 mm.
Example 3:
a) removing the corroded surface, and cutting the precise matching surface of the impeller by using a lathe to a depth of 1 mm; cutting a plurality of grooves on the fine matching surface of the impeller after removing the corrosion surface
b. Repairing the blade of the impeller, and welding a stainless steel screen plate at the worn edge of the blade for repairing;
c. drilling a plurality of holes on the impeller, and then removing oil stains and other organic matters on the surface of the impeller by using an oil stain cleaning agent;
d. increasing the surface roughness, and carrying out sand blasting on the impeller to enable the surface roughness of the impeller to reach 50 um;
e. smearing a repairing agent, namely smearing a SICONit ceramic material wear-resistant repairing agent with the thickness of 10mm on the surface of the impeller;
f. drying the wear-resisting agent, putting the impeller into an oven, and carrying out heat treatment for 6 hours at the temperature of 60 ℃;
g. recovering the size, namely processing the precise matching surface of the impeller by using a lathe, and cutting off redundant ceramic repairing agent materials to recover the size of the precise matching surface; adopting a diamond knife; firstly, roughly turning, namely using a 75-degree offset tool, wherein the front angle of the offset tool adopts a 6-degree rear angle and 12 degrees, roughly turning and leaving 2mm of allowance for finish turning, and the finish turning technological parameters are as follows: ap is 24mm, f is 0.25mm/r, and Vc is 120 r/min.
h. Surface finish treatment, namely uniformly coating composite ceramic fine particles on the surface of the impeller;
i. and dynamic balance treatment, namely performing dynamic balance experiment on the impeller to eliminate the risk of vibration after operation.
In the step e, when the repairing agent is coated, the coating thickness of the part with serious impeller abrasion is 10mm, and the coating thickness of the part with light impeller abrasion is 5 mm.
Claims (4)
1. A method for repairing an impeller of a desulfurization slurry circulating pump comprises the following steps:
a) removing the corroded surface, and cutting the depth of the precise matching surface of the impeller by using a lathe to be at least 3 mm;
b) repairing the blade of the impeller, and welding a stainless steel screen plate at the worn edge of the blade for repairing;
c) drilling a plurality of holes on the impeller, and then removing oil stains and other organic matters on the surface of the impeller by using an oil stain cleaning agent;
d) increasing the surface roughness, and carrying out sand blasting on the impeller to ensure that the surface roughness of the impeller reaches 10-50 um;
e) smearing a repairing agent, namely smearing a wear-resistant repairing agent with the thickness of 3-10 mm on the surface of the impeller;
f) drying the wear-resistant agent, putting the impeller into an oven, and carrying out heat treatment at the temperature of 60 ℃ for 2-6 hours;
g) recovering the size, namely processing the precise matching surface of the impeller by using a lathe, and cutting off redundant ceramic repairing agent materials to recover the size of the precise matching surface;
h) surface finish treatment, namely uniformly coating composite ceramic fine particles on the surface of the impeller;
i) dynamic balance treatment, namely performing dynamic balance experiment on the impeller to eliminate the risk of vibration after operation;
the step a) is to cut a plurality of grooves on the fine matching surface of the impeller after the corroded surface is removed.
2. The method for repairing a circulating pump impeller of a desulfurization slurry as set forth in claim 1, wherein: in the step e), when the repairing agent is coated, the coating thickness of the part with serious impeller abrasion is 5-10 mm, and the coating thickness of the part with light impeller abrasion is 3-5 mm.
3. The method for repairing a circulating pump impeller of a desulfurization slurry as set forth in claim 1, wherein: the wear-resistant repairing agent is a SICONit ceramic material.
4. The method for repairing a circulating pump impeller of a desulfurization slurry as set forth in claim 1, wherein: the turning process in the step g) adopts a diamond cutter; firstly, roughly turning, namely using a 75-degree offset tool, adopting a 4-6-degree rear angle as a front angle of the offset tool, adopting 10-12 degrees as a rear angle, roughly turning and leaving 2mm of allowance for finish turning, wherein the finish turning process parameters are that ap is 24mm, f is 0.18-0.25 mm/r, and Vc is 100-120 r/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611249854.9A CN106736232B (en) | 2016-12-29 | 2016-12-29 | Method for repairing impeller of desulfurization slurry circulating pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611249854.9A CN106736232B (en) | 2016-12-29 | 2016-12-29 | Method for repairing impeller of desulfurization slurry circulating pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106736232A CN106736232A (en) | 2017-05-31 |
| CN106736232B true CN106736232B (en) | 2020-04-14 |
Family
ID=58927503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611249854.9A Expired - Fee Related CN106736232B (en) | 2016-12-29 | 2016-12-29 | Method for repairing impeller of desulfurization slurry circulating pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106736232B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107790955A (en) * | 2017-10-27 | 2018-03-13 | 扬州中卓泵业有限公司 | A kind of restorative procedure of pump wearing piece macromolecule composite silicon carbide ceramic material |
| CN108942078A (en) * | 2018-08-31 | 2018-12-07 | 沃德传动（天津）股份有限公司 | A kind of speed reducer wear of end cover restorative procedure |
| CN109093321A (en) * | 2018-08-31 | 2018-12-28 | 沃德传动（天津）股份有限公司 | A kind of reductor shaft bearing bore restorative procedure |
| CN109093320A (en) * | 2018-08-31 | 2018-12-28 | 沃德传动（天津）股份有限公司 | A kind of speed reducer labyrinth disc restorative procedure |
| CN110539125A (en) * | 2019-09-03 | 2019-12-06 | 齐齐哈尔众工科技有限公司 | method for repairing slurry circulating pump |
| CN112059544A (en) * | 2020-08-26 | 2020-12-11 | 王立民 | Energy-saving modification method for water pump |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8127442B2 (en) * | 2005-12-15 | 2012-03-06 | United Technologies Corporation | Compressor blade flow form technique for repair |
| CN101797676B (en) * | 2010-01-13 | 2012-07-25 | 西安热工研究院有限公司 | Repair and surface protection process of desulfuration recycle pump |
| CN105750809A (en) * | 2014-12-13 | 2016-07-13 | 重庆霸腾机械有限公司 | Repairing technique for impeller of circulating pump |
| CN104858607A (en) * | 2015-04-24 | 2015-08-26 | 湘潭杰熙环境科技有限责任公司 | Full-repairing technology for housing of desulphurization circulating pump |
| CN105834668A (en) * | 2016-05-31 | 2016-08-10 | 上海祥贸实业有限公司 | Wear and corrosion resisting repair method for draught fan |
-
2016
- 2016-12-29 CN CN201611249854.9A patent/CN106736232B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN106736232A (en) | 2017-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106736232B (en) | Method for repairing impeller of desulfurization slurry circulating pump | |
| EP1563945A2 (en) | Repair of article by laser cladding | |
| CN110370467B (en) | Laser welding sheet capable of reducing cutting resistance and preparation process thereof | |
| CN102380605B (en) | Preparation method of hard alloy/high-chromium alloy-based wear-resistant composite material | |
| CN111019480B (en) | Abrasion-resistant surface treatment method for bottom ring of water turbine | |
| CN102166702B (en) | Laser cladding repairing method of piston rod | |
| CN107649755B (en) | High-speed arc discharge grinding composite processing method | |
| JP2010000540A5 (en) | ||
| CN105598655A (en) | Method for strengthening surface of metal turbine runner blade through combination of electric spark deposition and welding | |
| CN101767262A (en) | Reproducing method of forging mold by using composite build-up welding and spray welding method | |
| CN109233553A (en) | A kind of the abrasion repair coating and restorative procedure of desulfurization slurry pump | |
| CN108001952A (en) | Plate abrasion safeguards processing method immediately in large-scale Scraper Conveyer Middle Trough | |
| CN111570799A (en) | Diamond saw blade and preparation process thereof | |
| CN102677050A (en) | Method for cladding surface of metal workpiece with wear-resistant anti-corrosion ceramic hard alloy coating | |
| CN109128135B (en) | Pulse laser remanufacturing and forming process for self-fluxing alloy powder and titanium alloy blade | |
| CN104858792B (en) | A kind of method of quick removal hot-spraying coating | |
| CN217651319U (en) | Composite wear-resistant and corrosion-resistant coating structure applied to fan blade | |
| CN100386469C (en) | Salt bath tuff-triding treatment for high speed steel (W6Mo5Cr4V2) slide vane (or vane) | |
| CN110605670A (en) | High efficiency lifting hook formula shot-blasting cleaning machine impeller head | |
| Dixit et al. | Water jet machining: an advance manufacturing process | |
| CN103157950B (en) | Reamer body is separated and reuse method with blade | |
| CN105750809A (en) | Repairing technique for impeller of circulating pump | |
| JP2015199105A (en) | Method for production of blade body for automatic machine | |
| CN104174964A (en) | Twice hardening method for surface of steel drill bit | |
| CN203804285U (en) | Environment-friendly thin-walled drill bit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20200313 Address after: 550081 No.6, Changling North Road, guanshanhu District, Guiyang City, Guizhou Province Applicant after: Datang Guizhou Power Generation Co., Ltd Applicant after: DATANG GUIZHOU YEMAZHAI POWER GENERATION Co.,Ltd. Address before: 553600 Liupanshui Province, Zhongshan City, the town of Applicant before: DATANG GUIZHOU YEMAZHAI POWER GENERATION Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200414 Termination date: 20201229 |