CN114193081A - Method for rush-repairing cracks of blades of annular cooling blower - Google Patents
Method for rush-repairing cracks of blades of annular cooling blower Download PDFInfo
- Publication number
- CN114193081A CN114193081A CN202210031540.0A CN202210031540A CN114193081A CN 114193081 A CN114193081 A CN 114193081A CN 202210031540 A CN202210031540 A CN 202210031540A CN 114193081 A CN114193081 A CN 114193081A
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- China
- Prior art keywords
- welding
- blade
- blades
- polishing
- crack
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000001816 cooling Methods 0.000 title claims abstract description 13
- 238000003466 welding Methods 0.000 claims abstract description 54
- 238000005498 polishing Methods 0.000 claims abstract description 13
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 239000012459 cleaning agent Substances 0.000 claims abstract description 4
- 239000000428 dust Substances 0.000 claims abstract description 4
- 239000002932 luster Substances 0.000 claims abstract description 4
- 238000005299 abrasion Methods 0.000 claims abstract description 3
- 238000005253 cladding Methods 0.000 claims abstract description 3
- 238000000227 grinding Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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
- B23P6/04—Repairing fractures or cracked metal parts or products, e.g. castings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a method for rush-repairing cracks of a blade of an annular cooling blower, which comprises the following steps: cleaning and detecting the blades, removing deposited dust attached to the blades by using a cleaning agent, and performing flaw detection on the blades by using a penetrant, wherein the blades of the fan are detected to be free of other damages; polishing the blade cracks by adopting a handheld electric grinder along the crack direction until the metallic luster of the blade body is exposed; welding a blade crack, backing and welding through a welding rod, sequentially welding and repairing a cladding surface of a damaged part of the blade along the direction of the blade by using an abrasion-resistant welding wire, and hammering in time in the welding process; adding blade lining plates, and placing high-strength wear-resistant lining plates on two sides of the crack in a bolt connection and welding mode; secondary polishing, after welding, performing secondary polishing on the welding area by using a handheld electric grinder, and polishing the welding area until the surface is flat; and (3) testing the dynamic balance of the blade, namely pre-welding balance weights at 180-degree symmetrical positions of the welding position of the blade, and then testing to adjust the balance weights.
Description
Technical Field
The invention belongs to the technical field of blower blade repair, and particularly relates to a method for rush-repairing cracks of a ring cooling blower blade.
Background
The circular cooler uniformly distributes hot sinter produced by the sintering machine on a trolley of the revolving body through a feeding chute, the trolley does rotary motion along with the revolving body around the revolving center under the driving of a transmission device, and simultaneously blows cooling air from an air blower at the lower part of the trolley, and the cooling air takes away heat carried by the hot sinter after fully exchanging heat with the sinter, thereby realizing the process aim of circularly cooling the sinter. The air blower is the main source of cooling air medium, because in the daily production process, can't inspect, must get into in the flue after shutting down to look over the blade very intact, because fan blade preparation and thermal deformation etc. influence fracture deformation etc. are very general. If the damage of the organization personnel is found, the repair and the replacement of the rotor need more than 12 hours, and the cost of the spare parts of the rotor is high.
Disclosure of Invention
The invention aims to provide a method for rush-repairing cracks of a blade of a ring cooling blower.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for rush-repairing cracks on a blade of an annular cooling blower comprises the following steps:
1) cleaning and detecting the blades, removing deposited dust attached to the blades by using a cleaning agent, performing flaw detection on the blades by using a penetrant, determining the length, the trend and the number of cracks, and detecting that the blades of the fan are not damaged;
2) polishing the blade cracks by adopting a handheld electric grinder along the crack direction until the metallic luster of the blade body is exposed;
3) welding a blade crack, backing and welding through a welding rod, sequentially welding and repairing a cladding surface of a damaged part of the blade along the direction of the blade by using an abrasion-resistant welding wire, and hammering in time in the welding process;
4) adding blade lining plates, and placing high-strength wear-resistant lining plates on two sides of the crack in a bolt connection and welding mode;
5) secondary polishing, after welding, performing secondary polishing on the welding area by using a handheld electric grinder, and polishing the welding area until the surface is flat;
6) and (3) testing the dynamic balance of the blade, namely pre-welding balance weights at 180-degree symmetrical positions of the welding position of the blade, and then testing to adjust the balance weights.
The invention has the following beneficial effects: the major potential safety hazard of equipment is eliminated, necessary guarantee is provided for reliable and stable operation of the unit, and the cost of spare parts of the rotor is saved.
Detailed Description
The present invention will now be described in further detail.
A method for rush-repairing cracks on a blade of an annular cooling blower comprises the following steps:
1) cleaning and inspecting the blades. Before repairing, cleaning the dust attached to the blade by using a cleaning agent, and carrying out flaw detection on the blade by using a penetrant to determine the length, the trend and the number of cracks, wherein the detection shows that the fan blade has no other damage.
2) And (5) polishing the blade cracks. In order to facilitate subsequent welding and improve welding strength, a handheld electric grinder is used for grinding along the crack direction until the metallic luster of the blade body is exposed after grinding.
3) And welding the blade cracks. A J422 welding rod is selected for backing welding, the damaged part of the fan blade is sequentially welded and repaired along the blade direction by using a KB450 wear-resistant welding wire, hammering is timely performed in the welding process, so that the welding stress is eliminated, the blade deformation caused by thermal stress concentration is avoided, and the welding defects such as air holes and cracks at the welding seam are avoided.
4) And adding a blade lining plate. Considering that the working condition of the ring cooling blower is bad, the area of the blade crack is large, and in order to improve the connection strength of the blade crack and increase the safety and strength allowance of equipment, high-strength wear-resistant lining plates are specially selected to be arranged on two sides of the crack in a bolt connection and welding mode.
5) And (5) secondary grinding. After welding, the welding area is polished for the second time by a hand-held electric grinder until the surface is smooth, so as to ensure that no welding defect exists.
6) And testing the dynamic balance of the blade.
Balancing principle: for the repaired blade, the welding rod and the lining plate are added, so that the original mass distribution of the blade is changed, and the blade generates unbalanced concentrated mass
At operating speed, unbalanced mass
Will cause the blade to produce an unbalanced vibration vector
(amplitude and phase are a constant value) when increasing the trial weight
Rear and original weight
At the same speed, the blade will generate a new vibration vector
The vibration vector is balanced out
The counterweight to be added again is
And secondly, predicting a counterweight process, weighing to obtain 3566g of newly added wear-resistant lining plate, bolt and welding rod, and considering that the potential safety hazard exists when vibration data of the bearings at the 5# and the 7# are measured by directly adopting a vibration meter under the rated rotating speed of the fan, firstly welding a wear-resistant balance counterweight with the mass of 3500g in advance at the 180-degree symmetrical position of the blade welding position.
And thirdly, testing, starting the first-time successful fan after rush repair, wherein the numerical values show that the vibration speed values of the 5# and 7# point horizontal bearings are respectively 0.82mm/s and 0.85mm/s, and the vibration speed values of the 5# and 7# point vertical bearings are respectively 0.95mm/s and 0.97mm/s, which are both smaller than the root mean square value (the maximum is 4.6mm/s) of the maximum allowable vibration speed of the fan bearing, the real-time horizontal vibration speed values of the 5# and 7# bearings measured by the equipment real-time vibration monitoring system are 0.85mm/s and 0.86mm/s, and the data also show that the shafting vibration of the fan reaches an excellent level, and the unbalanced mass of the blade does not need to be corrected by adding a secondary counterweight.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (1)
1. A method for rush-repairing cracks of a blade of an annular cooling blower is characterized by comprising the following steps:
1) cleaning and detecting the blades, removing deposited dust attached to the blades by using a cleaning agent, performing flaw detection on the blades by using a penetrant, determining the length, the trend and the number of cracks, and detecting that the blades of the fan are not damaged;
2) polishing the blade cracks by adopting a handheld electric grinder along the crack direction until the metallic luster of the blade body is exposed;
3) welding a blade crack, backing and welding through a welding rod, sequentially welding and repairing a cladding surface of a damaged part of the blade along the direction of the blade by using an abrasion-resistant welding wire, and hammering in time in the welding process;
4) adding blade lining plates, and placing high-strength wear-resistant lining plates on two sides of the crack in a bolt connection and welding mode;
5) secondary polishing, after welding, performing secondary polishing on the welding area by using a handheld electric grinder, and polishing the welding area until the surface is flat;
6) and (3) testing the dynamic balance of the blade, namely pre-welding balance weights at 180-degree symmetrical positions of the welding position of the blade, and then testing to adjust the balance weights.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210031540.0A CN114193081A (en) | 2022-01-12 | 2022-01-12 | Method for rush-repairing cracks of blades of annular cooling blower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210031540.0A CN114193081A (en) | 2022-01-12 | 2022-01-12 | Method for rush-repairing cracks of blades of annular cooling blower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114193081A true CN114193081A (en) | 2022-03-18 |
Family
ID=80658384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210031540.0A Pending CN114193081A (en) | 2022-01-12 | 2022-01-12 | Method for rush-repairing cracks of blades of annular cooling blower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114193081A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203296104U (en) * | 2013-07-01 | 2013-11-20 | 秦平 | High-strength wear-resisting loader bucket |
| CN106033018A (en) * | 2015-03-19 | 2016-10-19 | 上海旗升电气股份有限公司 | Onsite dynamic balancing method needless of trial weighting and system for realizing method |
| CN107389268A (en) * | 2017-06-30 | 2017-11-24 | 西安交通大学 | A kind of multiple spot spot dynamic balance method based on fast algorithm |
| CN108443235A (en) * | 2018-05-24 | 2018-08-24 | 山东禹王生态食业有限公司 | The method for quickly solving bladed disk vibration |
| CN110153635A (en) * | 2019-06-14 | 2019-08-23 | 史海燕 | A kind of heterogeneous cold-patch Welding blocking up valve crackle for repairing main steam line online |
| CN110961858A (en) * | 2019-12-23 | 2020-04-07 | 东方电气集团东方汽轮机有限公司 | High-frequency pulse electric arc repairing method for precision casting defect of heavy gas turbine equiaxial crystal blade |
| CN113357200A (en) * | 2021-07-22 | 2021-09-07 | 西安热工研究院有限公司 | Structure and method for additionally installing balance weight on fan coupler |
| CN113600973A (en) * | 2021-09-18 | 2021-11-05 | 石河子大学 | Process flow for enhancing wear resistance of surface of fan impeller |
-
2022
- 2022-01-12 CN CN202210031540.0A patent/CN114193081A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203296104U (en) * | 2013-07-01 | 2013-11-20 | 秦平 | High-strength wear-resisting loader bucket |
| CN106033018A (en) * | 2015-03-19 | 2016-10-19 | 上海旗升电气股份有限公司 | Onsite dynamic balancing method needless of trial weighting and system for realizing method |
| CN107389268A (en) * | 2017-06-30 | 2017-11-24 | 西安交通大学 | A kind of multiple spot spot dynamic balance method based on fast algorithm |
| CN108443235A (en) * | 2018-05-24 | 2018-08-24 | 山东禹王生态食业有限公司 | The method for quickly solving bladed disk vibration |
| CN110153635A (en) * | 2019-06-14 | 2019-08-23 | 史海燕 | A kind of heterogeneous cold-patch Welding blocking up valve crackle for repairing main steam line online |
| CN110961858A (en) * | 2019-12-23 | 2020-04-07 | 东方电气集团东方汽轮机有限公司 | High-frequency pulse electric arc repairing method for precision casting defect of heavy gas turbine equiaxial crystal blade |
| CN113357200A (en) * | 2021-07-22 | 2021-09-07 | 西安热工研究院有限公司 | Structure and method for additionally installing balance weight on fan coupler |
| CN113600973A (en) * | 2021-09-18 | 2021-11-05 | 石河子大学 | Process flow for enhancing wear resistance of surface of fan impeller |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
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Application publication date: 20220318 |