CN110336172B - Method for repairing commutator on line after spark fault of direct current motor - Google Patents
Method for repairing commutator on line after spark fault of direct current motor Download PDFInfo
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- CN110336172B CN110336172B CN201910477441.3A CN201910477441A CN110336172B CN 110336172 B CN110336172 B CN 110336172B CN 201910477441 A CN201910477441 A CN 201910477441A CN 110336172 B CN110336172 B CN 110336172B
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- commutator
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/14—Maintenance of current collectors, e.g. reshaping of brushes, cleaning of commutators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
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- Power Engineering (AREA)
- Motor Or Generator Current Collectors (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
A method for repairing a commutator on line after a spark fault of a direct current motor comprises the following steps: searching a zero potential point by using a millivoltmeter when the motor is stopped; fixing a cutting device for processing on the site of a processing place; turning the whole surface of the commutator in a charged state until the precision requirement is met; cleaning falling objects in the commutator grooves when the motor stops running; thinning the mica sheets by adopting a sawtooth type scraper when the motor stops running; grinding the surface of the whole current in a charged state; removing the machining turning device fixed on the site; the motor is enabled to run in no-load mode under the rated voltage state; and putting into normal operation. The invention can make the surface smoothness of the processed commutator meet the requirement and the service cycle of the motor can be improved to more than two years from about half a year of the prior art and ensure the personal safety after the online turning and polishing treatment of the surface of the motor commutator under the conditions of motor electrification and man-machine insulation by the searched commutator zero potential point.
Description
Technical Field
The invention relates to a metal processing method, in particular to a method for repairing a direct current motor on line after spark failure, which is particularly suitable for the on-line treatment of a commutator after the spark abnormal failure of a large and medium direct current motor.
Background
In industrial enterprises, with the wide application of the ac frequency conversion technology, more and more large and medium-sized motors, especially main production lines of steel rolling, start to use the ac frequency conversion speed-regulating motor which is easy to maintain. However, because the direct current motor has the advantages of good starting performance and wide and smooth speed regulation characteristic, the direct current motor occupies a certain position in many occasions with high transmission performance requirements, and is also used in a large amount in steel rolling production enterprises, and the reality that a plurality of large and medium direct current motors contribute to production in the safe and stable operation of steel rolling production lines still exists. However, with respect to dc motor failure, there are common practical situations where it is difficult to maintain and handle online.
For many years, some direct current motors have been seriously burned due to large commutator sparks and even have failed in commutator ring fires, so that the failures of the direct current motors are seriously beyond the normal operating spark "level" grade standard, and the production stop due to the failures sometimes happens.
At present, the method for processing the large spark fault of the commutator of the direct current motor on line is generally adopted, which is to clean burrs among commutator pieces and carbon deposition in a ditch by a saw blade and wipe a local burnt position of the commutator by sand paper and alcohol. In the production practice, the problems are not completely solved, the spark fault of the partially burnt commutator is aggravated sometimes, even the major fault of the direct current motor commutator ring fire is caused, and finally the direct current motor commutator can only be stopped for replacement or sent to a professional manufacturer for maintenance and treatment in an off-line manner, so that the efficiency of a steel rolling production line is reduced. How to process the faults of large and medium-sized direct current motors on line always troubles electrical professional technicians, and technicians in the technical field also continuously research, but the effect is not ideal. If the patent documents similar to the invention are found by the intellectual property office of the people's republic of China, the invention names are as follows: the invention relates to an online processing method and a tool for spark faults of a direct current motor commutator, which comprises the following steps: and (5) tensioning essence. The patent application number is 201210359182.2, and the invention only uses the invented tool to clean the ditch and chamfer the commutator, and then uses sand paper to locally polish and polish the burned position. The surface smoothness and concentricity of the commutator processed by the method cannot be guaranteed, and the spark fault is difficult to solve when the surface burning of the commutator is serious or the ring fire fault is generated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for repairing a commutator on line after spark failure of a direct current motor, which improves the service cycle of the motor to two years or more and ensures the personal safety after the surface of the commutator of the motor is subjected to on-line turning and polishing treatment by the self-rotation of a motor rotor under the conditions of motor energization and man-machine insulation through the searched commutator zero potential point and weak magnetic technology.
The measures for realizing the aim are as follows:
a method for repairing a commutator on line after a spark fault of a direct current motor comprises the following steps:
1) in the motor shutdown state, a millivoltmeter is adopted to search a zero potential point, and marking is carried out after the zero potential point is found;
2) fixing a cutting device for processing on the site of a processing place, placing a cutter subjected to insulation processing at a zero potential point, and aligning the tip of the cutter to the central point of a commutator;
3) turning the whole surface of the commutator in a charged state until the precision requirement is met; in the process, the running voltage of the motor is 5-10% of the rated voltage;
4) cleaning falling objects in the commutator grooves in the motor off-line state, chamfering and deburring until the falling objects are cleaned;
5) thinning the mica sheet by using a saw-tooth type scraper under the state that the motor stops running, wherein the thinned thickness is just to enable the depth of the commutator groove to be the originally set depth;
6) grinding the surface of the rectifier under a charged state, wherein the grinding precision meets the precision requirement, and the running voltage of the motor is 5-10% of the rated voltage in the process;
7) removing the machining turning device fixed on the site;
8) under the condition of no load and rated voltage, the motor is operated for not less than 25min so as to form an oxide film on the surface of the rectifier;
9) and putting into normal operation.
It is characterized in that: the turning device consists of a carriage, a tool rest connected to the carriage, a cutter on the tool rest and a support frame connected with the lower end surface of the carriage; the support frame is fixedly connected with the site; the carriage is detachably connected with the support frame.
It is characterized in that: the sawtooth type scraper consists of a first clamping plate, a second clamping plate, a saw blade between the first clamping plate and the second clamping plate and a first handle connected to the first clamping plate or/and the second clamping plate.
It is characterized in that: in the process of processing, the insulating state is as follows: operators need to wear insulating gloves and insulating shoes; the insulated cutter is wound and insulated by using an insulating tape, the insulation grade reaches E level, the insulation length accounts for 60-75% of the total length of the cutter, and the sharp and tough part of the cutter for processing does not need to be wound with the insulating tape; and laying rubber sheets on the fixed site of the car scrap device.
It is characterized in that: the grinding is carried out by adopting a grinder; the grinder consists of a fixing plate, a grinding layer fixed on the fixing plate and a handle II fixed on the upper surface of the fixing plate; the shape of the working surface of the grinding layer is matched with that of the processing surface of the workpiece.
The zero potential point is searched by adopting the millivoltmeter because the potential difference and the induced current exist in the charged state of the motor, and the cutter is easy to burn in the process of turning scraps. In addition, the copper scraps of the car scraps are not easy to fall off, so that blasting phenomenon is easy to generate, and the commutator is seriously damaged.
The invention adopts the charged state when the commutator is turned, and the voltage of the commutator is limited to 5-10% of the rated voltage of the motor, because the voltage is controlled to control the reasonable linear speed of the turning chip processing, the processing precision and the personnel safety are ensured.
The invention adopts the charged state when the surface of the rectifier is ground, and the voltage of the charged state is limited to be 5-10% of the rated voltage of the motor, because the reasonable linear speed of grinding processing is controlled by the voltage, the processing precision and the personnel safety are ensured.
The reason that the mica sheet is thinned and the thinned thickness is limited so that the depth of the groove of the commutator is the originally set depth is that the mica sheet has higher hardness than the commutator, if the mica sheet is higher than the commutator, the motor can cause poor contact between the electric brush and the commutator during high-speed operation, the electric brush and the surface of the commutator generate 'striking fire', the commutator is burnt, the commutator is 'jumped off' for a long time, and the copper braided wire of the electric brush is jumped off, thereby causing serious consequences.
Compared with the prior art, the invention can ensure that the surface smoothness of the processed commutator meets the requirement and realizes on-line repair after the surface of the motor commutator is subjected to on-line turning and polishing treatment by the self-rotation of the motor rotor under the conditions of motor energization and man-machine insulation through the searched commutator zero potential point and weak magnetic technology, and the service life of the motor can be prolonged to more than two years from about half a year in the prior art, and the personal safety is ensured.
Drawings
FIG. 1 is a schematic structural view of a turning device according to the present invention;
FIG. 2 is a schematic structural view of a serrated scraper used in the present invention;
FIG. 3 is a schematic view of the grinder used in the present invention;
FIG. 4 is a schematic left or right view of the grinder of FIG. 3;
in the figure: the cutting tool comprises a base, a tool rest, a tool, a support, a clamping plate I, a clamping plate II, a saw blade, a handle I, a fixing plate 9, a grinding layer 10 and a handle II, wherein the base is provided with a support, a tool rest, a support, a clamping plate I, a clamping plate II, a saw blade 7, a handle I, a handle II.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
description of the drawings: the following devices and tools were used in the examples:
turning device: the simple turning tool rest comprises a carriage 1, a tool rest 2 connected to the carriage 1 and a tool 3 on the tool rest 2; the lower end surface of the planker 1 is connected with a support frame 4 through a bolt; the support frame 4 is fixedly connected with the site by adopting a bolt or welding mode.
Sawtooth type scraper: the saw consists of a first clamping plate 5, a second clamping plate 6, a saw blade 7 between the first clamping plate 5 and the second clamping plate 6, and a first handle 8 which is connected to the first clamping plate 5 or/and the second clamping plate 6 by welding or bolts.
Grinder: consists of a dead plate 9, a grinding layer 10 connected on the dead plate 9 in an embedding or bonding way, and a handle II 11 connected on the upper surface of the dead plate 9 by welding or bolts; the shape of the working surface of the abrasive layer 10 matches the shape of the working surface of the workpiece.
A method for repairing a commutator on line after a spark fault of a direct current motor comprises the following steps:
1) in the shutdown state of the motor, a millivoltmeter is adopted to search a zero potential point, and after the zero potential point is found, the zero potential point is marked;
2) fixing a cutting device for processing on the site of a processing place, placing the cutter 3 subjected to insulation processing at a zero potential point, and aligning the tool tip of the cutter 3 with the central point of a commutator; the insulation length of the cutter 3 is 60%/69%/75% of the total length of the cutter;
3) processing the whole surface of the rectifier under the charged state until the precision requirement is met; in the process, the running voltage of the motor is 5%/7%/10% of the rated voltage;
4) cleaning falling objects in the commutator grooves in the motor off-line state, chamfering and deburring until the falling objects are cleaned;
5) the mica sheet is thinned by adopting the sawtooth type scraper under the state that the motor stops running, and because the depth of the commutator groove is 2mm/1.5mm/2.2mm different from the originally set depth after turning and measurement, the thinned thickness of the mica sheet is 2mm/1.5mm/2.2mm, and the originally set depth of the commutator groove is ensured; the mica sheets are thinned by the saw blade 7;
6) grinding the surface of the whole current in a charged state, wherein the grinding precision meets the precision requirement, and the running voltage of the motor is 5%/7%/10% of the rated voltage in the process; the polishing layer 10 polishes the surface of the whole fluid;
7) removing the machining turning device fixed on the site;
8) the motor is operated for 26min/28min/31min under the no-load rated voltage state, and an oxide film is formed on the surface of the rectifier;
9) and putting into normal operation.
The repaired motors are put into operation respectively for 15 months, 18 months and 21 months, the spark phenomenon is not generated, and the motors still continue to operate normally.
The present embodiments are merely preferred examples, and are not intended to limit the scope of the present invention.
Claims (1)
1. A method for repairing a commutator on line after a spark fault of a direct current motor comprises the following steps:
1) in the motor shutdown state, a millivoltmeter is adopted to search a zero potential point, and marking is carried out after the zero potential point is found;
2) fixing a cutting device for processing on the site of a processing place, placing the insulated cutter at a zero potential point, and aligning the cutter tip to the central point of a commutator;
3) processing the whole surface of the commutator in a charged state until the precision requirement is met; in the process, the running voltage of the motor is 5-10% of the rated voltage;
4) cleaning falling objects in the commutator grooves in the motor off-line state, chamfering and deburring until the falling objects are cleaned;
5) thinning the mica sheet by using a saw-tooth type scraper under the state that the motor stops running, wherein the thinned thickness is just to enable the depth of the commutator groove to be the originally set depth;
6) grinding the whole surface of the commutator in a charged state, wherein the grinding precision meets the precision requirement, and the running voltage of the motor is 5-10% of the rated voltage in the process;
7) removing the machining turning device fixed on the site;
8) enabling the motor to run for not less than 25min under the no-load rated voltage state so as to form an oxide film on the surface of the rectifier;
9) putting into normal operation;
the grinding is carried out by adopting a grinder; the grinder consists of a fixing plate, a grinding layer fixed on the fixing plate and a handle II fixed on the upper surface of the fixing plate; the shape of the working surface of the grinding layer is matched with that of the processing surface of the workpiece;
the sawtooth type scraper consists of a first clamping plate, a second clamping plate, a saw blade between the first clamping plate and the second clamping plate and a first handle connected to the first clamping plate or/and the second clamping plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910477441.3A CN110336172B (en) | 2019-06-03 | 2019-06-03 | Method for repairing commutator on line after spark fault of direct current motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910477441.3A CN110336172B (en) | 2019-06-03 | 2019-06-03 | Method for repairing commutator on line after spark fault of direct current motor |
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| CN110336172A CN110336172A (en) | 2019-10-15 |
| CN110336172B true CN110336172B (en) | 2021-06-22 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201594782U (en) * | 2009-12-11 | 2010-09-29 | 新疆维吾尔自治区阿克苏电力有限责任公司 | Special slot hooking and inverting tool of direct current armature |
| CN204517587U (en) * | 2015-05-07 | 2015-07-29 | 云峰发电厂 | Electronic automatic control commutator scrapes ditch device |
| CN207771562U (en) * | 2017-11-21 | 2018-08-28 | 浙江华电乌溪江水力发电有限公司 | Grinding device and carbon brush grinder |
| CN108747866A (en) * | 2018-06-11 | 2018-11-06 | 陈悠葭 | A kind of grinding paster milling tools |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5783143A (en) * | 1980-11-10 | 1982-05-24 | Nippon Steel Corp | Repairing method for surface of commutator of direct current rotary machine |
| CN202910566U (en) * | 2012-11-16 | 2013-05-01 | 鞍钢集团矿业公司 | Exciter commutator maintenance and repair device |
-
2019
- 2019-06-03 CN CN201910477441.3A patent/CN110336172B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201594782U (en) * | 2009-12-11 | 2010-09-29 | 新疆维吾尔自治区阿克苏电力有限责任公司 | Special slot hooking and inverting tool of direct current armature |
| CN204517587U (en) * | 2015-05-07 | 2015-07-29 | 云峰发电厂 | Electronic automatic control commutator scrapes ditch device |
| CN207771562U (en) * | 2017-11-21 | 2018-08-28 | 浙江华电乌溪江水力发电有限公司 | Grinding device and carbon brush grinder |
| CN108747866A (en) * | 2018-06-11 | 2018-11-06 | 陈悠葭 | A kind of grinding paster milling tools |
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Effective date of registration: 20220323 Address after: 201999 No. 3520, Tongji Road, Baoshan District, Shanghai Patentee after: Baowu equipment Intelligent Technology Co.,Ltd. Address before: 430083 Gate No. 2, Qingshan District, Hubei, Wuhan Patentee before: WUHAN IRON AND STEEL Co.,Ltd. |
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