CN115178985A - Assembly welding method for turbine overflow surface wear plate - Google Patents
Assembly welding method for turbine overflow surface wear plate Download PDFInfo
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- CN115178985A CN115178985A CN202211042826.5A CN202211042826A CN115178985A CN 115178985 A CN115178985 A CN 115178985A CN 202211042826 A CN202211042826 A CN 202211042826A CN 115178985 A CN115178985 A CN 115178985A
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- wear
- plug welding
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- welding
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- 238000003466 welding Methods 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000011159 matrix material Substances 0.000 claims abstract description 20
- 238000003825 pressing Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000009434 installation Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 238000005299 abrasion Methods 0.000 description 10
- 230000003628 erosive effect Effects 0.000 description 8
- 238000003754 machining Methods 0.000 description 7
- 239000002994 raw material Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
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Classifications
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- 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
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Hydraulic Turbines (AREA)
Abstract
The application relates to the technical field of hydraulic turbine unit installation, and discloses a hydraulic turbine overflow surface wear plate assembling and welding method, which is characterized by comprising the following steps of: step 1, processing plug welding holes after blanking of the wear-resistant plate; step 2, placing the matrix on a platform of a press machine, and firmly pressing and mounting the wear-resistant plate through the press machine; step 3, welding the wear-resistant plate on the matrix; step 4, the wear-resistant plate is integrally processed, so that the material utilization rate is effectively improved; the processing period is shortened; the assembly quality is ensured, and the cavitation damage rate in operation is reduced.
Description
Technical Field
The invention relates to the technical field of installation of hydraulic turbine units, in particular to a method for assembling and welding a wear-resistant plate of an overflow surface of a hydraulic turbine.
Background
Water energy is fully developed and utilized as clean energy, a water turbine converts water gravitational potential energy into electric energy, the water turbine depends on that water flowing at high speed flows through a pressure pipeline and a wear plate to impact a water turbine runner to rotate so as to drive a generator rotor to move along a cutting magnetic induction line and generate induced current to generate electricity, and when the water turbine operates, the damage to an overflow surface can be caused, wherein one is erosion which cannot be avoided, and the other is cavitation erosion or cavitation erosion which can only be reduced. The cavitation erosion is caused by the facts that the abrasion-resistant plate is not firmly attached to the bottom ring and the top cover in a welding mode, air noise exists when the abrasion-resistant plate is welded in the welding mode, the bottom ring and the top cover are collectively called as a matrix, when high-speed high-pressure water flow passes through the abrasion-resistant plate, negative pressure can be generated on the surface of the abrasion-resistant plate, stripping force is generated in an area with the air noise between the abrasion-resistant plate and the matrix, and the abrasion-resistant plate is caused to be stripped in a cavitation erosion mode after long-term operation.
Chinese patent document CN216241039U discloses an antiwear plate applied to hydraulic turbine top cap and bottom ring, including the antiwear plate body, the antiwear plate body sets up on bottom ring upper surface and on top cap lower surface, the antiwear plate body comprises first arc makeup, second arc makeup and third arc makeup, and first arc makeup, second arc makeup and third arc makeup stagger in proper order and splice into antiwear plate, all inlay on first arc makeup, second arc makeup and the third arc makeup and be equipped with wear-resistant ceramic stick.
The traditional wear plate assembling and welding process includes machining the top cover and the bottom ring plane to reach roughness of Ra12.5 in the surface A of the wear plate and the surface B of the wear plate, drilling plug welding hole to weld the wear plate onto the matrix, plug welding Kong Manhan around the wear plate, welding the wear plate and the matrix into one integral, and machining the surface B of the wear plate.
This prior art has the following disadvantages: when the water turbine works, water flow which is high in speed and pressure and is mixed with sediment and other hard particles flows in a flow channel of the unit, the flow surfaces of a top cover and a bottom ring of the water turbine can be seriously scoured and abraded, the abrasion-resistant plate can reduce cavitation erosion, and the abrasion-resistant plate still needs to be frequently replaced.
Disclosure of Invention
The invention aims to provide a method for welding wear plates on an overflow surface of a water turbine, which aims to solve the problem that the wear plates are frequently replaced after the overflow surface of the water turbine is cavitated.
In order to achieve the aim, the invention provides a method for assembling and welding a wear plate of a flow surface of a water turbine, which is characterized by comprising the following steps of:
In order to press the wear-resistant plate smoothly and improve the circulation period, in the step 2, the matrix is placed on a platform of a press machine, a plurality of pieces of hollow square steel are placed between the press machine and the wear-resistant plate, the positions of plug welding holes are staggered, and the wear-resistant plate is pressed firmly gradually until no mute sound is generated by knocking.
Preferably, in the step 1, 5 plug welding holes are processed after the wear plate is blanked, wherein the plug welding holes are a plug welding hole I, a plug welding hole II, a plug welding hole III, a plug welding hole IV and a plug welding hole V, the plug welding hole I is located in the center of the wear plate, the plug welding hole II is symmetrical to the plug welding hole III along the central line, and the plug welding hole IV is symmetrical to the plug welding hole V along the central line.
In order to effectively control welding deformation and ensure product quality, in step 3, the welding sequence is as follows: sequentially welding a plug welding hole I, a plug welding hole II, a plug welding hole III, a plug welding hole IV and a plug welding hole V; welding the welding seams at the two sides; and finally, adopting symmetrical rotary welding for the inner annular seam and the outer annular seam.
The invention has the beneficial effects that:
1. according to the invention, the wear-resistant plate is pressed firmly by a press machine step by step, so that the surface A of the wear-resistant plate is not machined, the phenomenon that the guard plate is warped due to the cutting residual stress when the surface A is machined is avoided, the paving and welding are uneven, the problems of infirm internal lamination and internal air noise are solved, the wear-resistant plate is more tightly laminated with a matrix, the cavitation erosion damage rate during operation is reduced, the cavitation erosion degree of an overflow surface is further reduced, the replacement frequency of the wear-resistant plate is reduced, the traditional wear-resistant plate needs to be replaced after being used for 1-2 years, and the wear-resistant plate adopting the scheme can be used for more than 3 years.
2. When traditional wear plate local cavitation was peeled off and is reached the certain degree, the unit need stop the operation, need change original wear plate. Because the wear-resistant plate needs to be machined on the two sides AB, enough machining allowance needs to be reserved, a thicker wear-resistant plate raw material is used, the surface A of the wear-resistant plate is machined firstly, and then the wear-resistant plate raw material is welded on a matrix, the problem of welding blank sound of part of manual tools is solved by using the method, the surface B of the wear-resistant plate is machined, the plate utilization rate = net weight of the wear-resistant plate/input plate weight, the traditional utilization rate is about 60.1%, the re-paving welding and machining period of the wear-resistant plate is long, and the cost for replacing the wear-resistant plate by frequently stopping the operation is high; the invention has the advantages that after the wear-resistant plate is blanked, the plug welding hole is directly processed, the surface A is not processed, the thickness of the raw material of the steel plate is reduced, the utilization rate of the wear-resistant plate is improved from 60.1% to 78.6%, in addition, the period for replacing the wear-resistant plate is prolonged by adopting a press mounting mode, and the operation cost is reduced.
Drawings
FIG. 1 is a schematic view of the wear plate of example 1;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a schematic view of a welding structure of a wear plate and a matrix;
FIG. 4 is a schematic view of a wear plate compression structure;
FIG. 5 is a schematic view of a wear plate assembly of the present embodiment 2;
FIG. 6 is a schematic diagram of the wear plate area and nesting;
fig. 7 shows the wear plate thickness.
Reference numerals: 1. a wear plate; 2. a parent body; 3. a press machine; 4. hollow square steel; 5. a plug welding hole I; 6. a second plug welding hole; 7. a plug welding hole III; 8. a plug welding hole IV; 9. a plug welding hole V; 10. a side weld; 11. inner circular seam; 12. outer circular seam; .
Detailed Description
The following detailed description of the embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to these embodiments, and modifications made to the invention without departing from the principle of the invention fall within the scope of the claims of the present invention.
Example 1
As shown in fig. 1-4, a method for assembling and welding a wear plate on an overflow surface of a water turbine comprises the following steps:
in the step 3, the wear-resistant plate 1 is welded on the matrix 2, and the welding sequence is as follows: sequentially welding a plug welding hole I5, a plug welding hole II 6, a plug welding hole III 7, a plug welding hole IV 8 and a plug welding hole V9; welding the welding seams 10 at the two sides; finally, the inner annular seam 11 and the outer annular seam 12 are welded in a symmetrical rotation mode;
and 4, integrally processing the lower end face of the matrix 2 and the surface B of the wear plate 1 after integral welding, so that the whole product reaches the tolerance range of a design drawing.
The thickness of the raw material of the wear-resistant plate 1 is reduced, and the utilization rate of the material is effectively improved; the processing amount of the wear plate 1 is reduced, and the processing time is shortened from the original processing of an AB surface to the processing of a B surface; the abrasion-resistant plate 1 is pressed by a simple tool, so that the assembling quality is ensured, the abrasion-resistant plate 1 is attached to the matrix 2 more tightly, and the cavitation damage rate during operation is reduced.
As shown in fig. 6 and 7, the final thickness of the wear plate in the prior art is 8mm, the single-side machining allowance is 4mm, the allowance of 8mm is machined after the weld is removed to form a whole, so that a wear plate with the thickness of 16mm is adopted, the utilization rate = net weight of the wear plate/weight of the input plate,
s is the area 125486mm of the wear plate 2 A is 570mm long, b is 280mm wide, t is 16mm thick,
the result was 60.1%.
The final thickness of the wear-resistant plate is 8mm, the single-side machining allowance is 4mm, the B-side machining allowance is 4mm after the whole body is formed by removing welding, so that the wear-resistant plate with the thickness of 12mm is adopted, the utilization rate = the net weight of the wear-resistant plate/the weight of the input plate,
s is a wear plateArea 125486mm 2 A is 570mm in plate length, b is 280mm in plate width, t is 12mm in plate thickness,
the result was 78.6%.
Example 2
Referring to fig. 5, the method for assembling and welding the wear plate on the flow surface of the water turbine according to example 1 is different in that in step 2, a matrix 2 is placed on a platform of a press 3, and 4 pieces of hollow square steel 4 are used, wherein 2 pieces of hollow square steel 4 are overlapped above the other 2 pieces of hollow square steel 4 to perform press-fitting on the wear plate 1.
Claims (4)
1. A method for assembling and welding a wear plate on the flow surface of a water turbine is characterized by comprising the following steps:
step 1, processing plug welding holes after blanking of a wear-resistant plate (1);
step 2, placing the matrix (2) on a press platform, and firmly pressing and mounting the wear-resistant plate (1) through a press (3);
step 3, welding the wear-resistant plate (1) on the matrix (2);
and 4, integrally processing the wear-resistant plate (1).
2. The assembly welding method for the turbine flow surface wear plate according to claim 1, characterized in that: in the step 2, the matrix (2) is placed on a platform of a press machine (3), a plurality of pieces of hollow square steel (4) are placed between the press machine (3) and the wear-resistant plate (1), the positions of plug welding holes are staggered, and the wear-resistant plate (1) is gradually and firmly pressed until no mute sound is generated by knocking.
3. The assembling and welding method for the turbine flow surface wear plate according to claim 1 or 2, characterized in that: in the step 1, 5 plug welding holes are processed after the wear plate (1) is blanked and are respectively a plug welding hole I (5), a plug welding hole II (6), a plug welding hole III (7), a plug welding hole IV (8) and a plug welding hole V (9), the plug welding hole I (5) is located in the center of the wear plate (1), the plug welding hole II (6) and the plug welding hole III (7) are symmetrical along a central line, and the plug welding hole IV (8) and the plug welding hole V (9) are symmetrical along the central line.
4. The assembly welding method for the turbine flow surface wear plate according to claim 3, characterized in that: in step 3, the welding sequence is as follows: sequentially welding a plug welding hole I (5), a plug welding hole II (6), a plug welding hole III (7), a plug welding hole IV (8) and a plug welding hole V (9); welding the welding seams (10) at the two sides; and finally, the inner annular seam (11) and the outer annular seam (12) are welded in a symmetrical rotation mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211042826.5A CN115178985A (en) | 2022-08-29 | 2022-08-29 | Assembly welding method for turbine overflow surface wear plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211042826.5A CN115178985A (en) | 2022-08-29 | 2022-08-29 | Assembly welding method for turbine overflow surface wear plate |
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| Publication Number | Publication Date |
|---|---|
| CN115178985A true CN115178985A (en) | 2022-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211042826.5A Pending CN115178985A (en) | 2022-08-29 | 2022-08-29 | Assembly welding method for turbine overflow surface wear plate |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1915574A (en) * | 2006-08-29 | 2007-02-21 | 今创集团有限公司 | Fabrication technique for welding box cover and box body made from stainless steel sheet |
| CN202370733U (en) * | 2011-12-20 | 2012-08-08 | 重庆水轮机厂有限责任公司 | Anticorrosive structure for top cover and bottom ring of hydraulic turbine |
| CN102962561A (en) * | 2012-11-02 | 2013-03-13 | 哈尔滨汽轮机厂有限责任公司 | Method for controlling deformation of water chamber gasket supporting plate during manufacturing process |
| CN210564871U (en) * | 2019-07-09 | 2020-05-19 | 杭州力源发电设备有限公司 | Wear plate structure can be dismantled to hydraulic turbine top cap, bottom ring |
| CN114833482A (en) * | 2022-01-19 | 2022-08-02 | 云南建投第二安装工程有限公司 | Construction method and auxiliary device for lining stainless steel plate of large-diameter tower equipment |
-
2022
- 2022-08-29 CN CN202211042826.5A patent/CN115178985A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1915574A (en) * | 2006-08-29 | 2007-02-21 | 今创集团有限公司 | Fabrication technique for welding box cover and box body made from stainless steel sheet |
| CN202370733U (en) * | 2011-12-20 | 2012-08-08 | 重庆水轮机厂有限责任公司 | Anticorrosive structure for top cover and bottom ring of hydraulic turbine |
| CN102962561A (en) * | 2012-11-02 | 2013-03-13 | 哈尔滨汽轮机厂有限责任公司 | Method for controlling deformation of water chamber gasket supporting plate during manufacturing process |
| CN210564871U (en) * | 2019-07-09 | 2020-05-19 | 杭州力源发电设备有限公司 | Wear plate structure can be dismantled to hydraulic turbine top cap, bottom ring |
| CN114833482A (en) * | 2022-01-19 | 2022-08-02 | 云南建投第二安装工程有限公司 | Construction method and auxiliary device for lining stainless steel plate of large-diameter tower equipment |
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