CN115703116A - Deep maintenance process for prolonging service life of frequency converter - Google Patents
Deep maintenance process for prolonging service life of frequency converter Download PDFInfo
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- CN115703116A CN115703116A CN202110912911.1A CN202110912911A CN115703116A CN 115703116 A CN115703116 A CN 115703116A CN 202110912911 A CN202110912911 A CN 202110912911A CN 115703116 A CN115703116 A CN 115703116A
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- 230000032683 aging Effects 0.000 claims abstract description 20
- 238000002474 experimental method Methods 0.000 claims abstract description 20
- 238000007689 inspection Methods 0.000 claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 230000006870 function Effects 0.000 claims abstract description 7
- 239000003973 paint Substances 0.000 claims abstract description 5
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 239000000428 dust Substances 0.000 claims description 18
- 238000009826 distribution Methods 0.000 claims description 9
- 230000006872 improvement Effects 0.000 claims description 8
- 238000009423 ventilation Methods 0.000 claims description 8
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- 238000009434 installation Methods 0.000 claims description 6
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- 238000002791 soaking Methods 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 5
- 238000003745 diagnosis Methods 0.000 claims description 5
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- 230000002378 acidificating effect Effects 0.000 claims description 4
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- 238000012360 testing method Methods 0.000 claims description 4
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- 238000000861 blow drying Methods 0.000 claims description 3
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- 239000007924 injection Substances 0.000 claims description 3
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Abstract
The invention relates to the technical field of industrial equipment maintenance, in particular to a service life prolonging and deep maintenance process for a frequency converter. The system comprises a frequency converter maintenance part and an environment maintenance part; the frequency converter maintenance part mainly comprises: electrifying for initial detection, confirming the fault phenomenon, building files, disassembling, and turning to a cleaning workstation for deep cleaning if the initial detection is qualified; if the initial inspection is unqualified, entering a maintenance procedure; after finishing, spraying three-proofing paint on the part of the line board, and drying; cleaning stubborn stains on the circuit board; respectively carrying out aging experiments on the parts and the whole machine for 4-72h, finally checking and accepting, detecting functions and general functions used on the using site of the frequency converter, setting backup and pasting service identification by software, making a maintenance report and making a file; the service life of the frequency converter is prolonged, the frequency converter is maintained deeply, the working environment of the frequency converter is comprehensively evaluated, hidden dangers are eliminated, the service life of the frequency converter is effectively prolonged, and the fault rate of the frequency converter is reduced.
Description
Technical Field
The invention relates to the technical field of industrial equipment maintenance, in particular to a service life prolonging and deep maintenance process for a frequency converter.
Background
The quality of the frequency converter determines the inherent service life of the frequency converter, and the operating environment of the frequency converter deeply influences the service life of the frequency converter. The anti-noise capability of the frequency converters with the same capacity and different brands to dust is different, and the frequency converters with the same capacity and different brands have an inverse trend with the volume, namely: the smaller the volume/capacity the less resistant the transducer to dust. The service life of the frequency converter is influenced by the configuration of the power cabinet, the sealing and blocking condition of the power distribution room, the environmental ventilation, the environmental temperature, the humidity, the field atmospheric environment and the existence of the dust cover. When the frequency converter is maintained, the maintenance skills of operators are uneven, the traditional purging such as shoe separation itching is a ubiquitous industry status, and any maintenance also causes damage to the frequency converter to a certain degree. This is also a potential factor leading to increased failure rates and reduced life.
At present, scattered maintenance providers are distributed all over the country and are in war, and the maintenance providers do not have a unified standard, have weak advantages, are not scaled, and are expected to be exclamated when meeting mainstream multi-transmission and high-voltage frequency converters. The frequency converter breaks down often because circuit board and inside stubborn dust are dirty to be caused, and the maintenance is only to the partial maintenance of trouble, does not do the cleanness to all parts of complete machine, and hidden danger still exists after the maintenance, leads to the fault rate frequent, and maintenance cycle is shorter and shorter more, has finally seriously shortened the life of frequency converter. In addition, the circuit board is damaged during maintenance, and the damaged circuit board has no remedial and protective measures and is also an element for artificially increasing hidden dangers. Even if the cleaning is carried out regularly, the surface dust such as shoe itching is simply blown by compressed air with two atmospheric pressures after the machine shell is opened, and the problem of prolonging the service life is not solved. Sometimes also resulting in a fryer because of dust redistribution. The existing maintainers do not basically have professional testing devices and intelligent expert auxiliary systems. Making the diagnosis rather blind and risky. The life reduction factors caused by the factors such as the distribution room environment, the ventilation effect, the cabinet body protection level, the blocking and the like are not considered.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a process for prolonging the service Life and maintaining the depth of the frequency converter aiming at the technical defects, wherein the abbreviation of Life Extension Deep Maintenance is adopted for the prolonging service Life and maintaining the depth of the Life Extension Deep Maintenance: LEDM adopts multichannel process to carry out comprehensive maintenance and hidden danger investigation to the operational environment of converter itself and converter, has solved the current problem that the means effect is poor of maintaining.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a frequency converter service life prolonging deep maintenance process comprises a frequency converter maintenance part and an environment maintenance part;
the frequency converter maintenance part: step one, electrifying for initial detection, confirming a fault phenomenon, building a file, disassembling, if the initial detection is qualified, switching to step two, and if the initial detection is unqualified, switching to step three;
step two, entering a cleaning workstation for deep cleaning;
step three, entering a maintenance program, and turning to step two after the maintenance is finished;
step four, performing three-proofing paint spraying on the circuit board part after the step two is completed, and drying;
step five, cleaning stubborn stains of the circuit board; soaking part or all of the area;
step six, performing an aging experiment on the components for 4-72 hours, and transferring the components which fail through the aging experiment to step three, and transferring the components which are qualified through the aging experiment to step seven;
step seven, performing an aging experiment on the whole machine for 4-72 hours, and confirming no hidden danger when the whole machine is electrified with a current limit so as to avoid the possible hidden danger of the explosive machine when the whole machine is electrified for the first time after maintenance, and then confirming no hidden danger when the whole machine is electrified normally with a load, and turning to the step three if the whole machine is unqualified after the aging experiment; step eight, the whole machine aging test is qualified;
checking and accepting, detecting functions and common functions used on the using site of the frequency converter, setting backup and pasting service identification by software, and making a maintenance report and filing;
and an environment maintenance part: the method comprises the improvement scheme of the environment of a power distribution room and a power cabinet; the method comprises the following steps:
step nine, evaluating the dust condition of the installation environment of the frequency converter, checking the blocking condition of the power cabinet, and measuring the heat dissipation and ventilation effects;
step ten, evaluating and calculating the environment of the power distribution room, the ventilation of the power cabinet body and the dust filtration condition respectively, and making and implementing an improvement scheme;
step eleven, deeply cleaning dust in the power cabinet body;
step twelve, inspecting the upper end and the lower end of the frequency converter on the installation site of the frequency converter, and loading the frequency converter after the step eight into a power cabinet;
thirteen, carrying out 24-hour running follow-up on the frequency converter, feeding back and archiving follow-up information, perfecting cleaning reports and suggestions, and perfecting frequency converter archives.
Further optimizing the technical scheme, the second step comprises a preliminary preparation process and a deep cleaning process, wherein the preliminary preparation process comprises the following steps: s2.1, sweeping the whole machine by adopting dry compressed air with 7 atmospheric pressures, and then disassembling the whole machine;
s2.2, performing initial detection on each part, including detecting the heat-conducting silicone grease of the IGBT and the rectifier bridge and replacing a person with dry silicone grease;
the deep cleaning process comprises the following processes:
s2.3, performing 7-atmosphere dry compressed air wind bath blowing in a cleaning workstation until no dust is seen;
s2.4, sampling the stubborn attachments on the circuit board under an electron microscope with the power of more than 100 times, and carrying out a solubility analysis experiment on the taken stubborn attachment sample;
s2.5, performing concentrated high-pressure removal on all parts, performing concentrated time-adding point injection by adopting a water pressure fine water column of more than 7 kilograms, and then purging the parts by using 7 kilograms of steam with the pressure of 120 ℃;
s2.6, according to the solubility diagnosis result of the step S2.4, adopting one or more of multi-enzyme acidic or alkaline cleaning solutions to respectively carry out chemical removal on stubborn attachments, and soaking part or all areas of the part in a chemical agent;
s2.7, removing oil and sterilizing the frequency converter component by adopting alcohol, and removing mould and a growth environment thereof;
s2.8, putting the components into a drying box, and carrying out air bath drying;
and S2.9, removing the white spots left after air bath blow drying, drying again, and placing under an electron microscope for inspection.
The technical scheme is further optimized, before the sixth step, the power supply board, the main control board and the interface board are respectively subjected to electrifying inspection, the rectifier bridge and the IGBT are respectively subjected to voltage withstanding and triggering inspection, the capacity and voltage withstanding performance of the electrolytic capacitor are inspected, the resistance value of the voltage-sharing resistor, the charging loop and the Hall current transformer are respectively inspected, and unqualified inspection is replaced or maintained.
Compared with the prior art, the invention has the following advantages: 1. the service life of the frequency converter is prolonged, the maintenance is deeply carried out, the working environment of the frequency converter is comprehensively evaluated and hidden dangers are eliminated, the service life of the frequency converter is effectively prolonged, and the failure rate of the frequency converter is reduced; 2. the method expands the operating environment improvement factors of the frequency converter, improves the environments of a distribution room and a power cabinet which influence the service life of the frequency converter to the best extent, and is the core of the LEDM for prolonging the service life of the frequency converter; 3. the service life prolonging deep cleaning and the maintenance are organically combined together, so that the maintenance is necessary to be clean, hidden dangers are found in the cleaning and the maintenance, the hidden dangers are eliminated, namely the maintenance is carried out, the damage caused in the maintenance process is made up, and the secondary fault caused by the damage is avoided; 4. the method has the advantages that the method carries out solubility diagnosis on stubborn stains in the frequency converter, and selects multi-enzyme acidic or multi-enzyme alkaline cleaning solution for chemical removal in a targeted manner, so that the cleaning is more thorough; 5. thoroughly removing residual stubborn and stubborn attachments in the frequency converter by adopting high-pressure water bath and steam purging; 6. the circuit board is sprayed and washed by alcohol, oil stain is removed, sterilization is carried out, and the secondary breeding of stubborn attachments is avoided; 7. and the circuit board is sprayed with the three-proofing paint, so that the running stability of the frequency converter is further improved, and the service life is prolonged.
Drawings
FIG. 1 is a process route diagram of a frequency converter service life-extending deep maintenance process.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings of the embodiments. It is to be understood that this description is intended for purposes of illustration only and is not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The use of the terms "a" and "an" or "the" and similar referents in the description and claims of the present invention also do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
The specific implementation mode is as follows: referring to fig. 1 and table 1, a process for maintaining the life-prolonging depth of a frequency converter, the life-prolonging depth maintenance english abbreviation: and (4) LEDM. The LEDM process comprises a frequency converter maintenance part and an environment maintenance part.
The maintenance part of the frequency converter comprises deep cleaning for prolonging the service life and maintenance found in disassembly cleaning, and the LEDM organically combines the deep cleaning for prolonging the service life and the maintenance together, so that the maintenance is necessary to clean and maintain, hidden dangers are found in the cleaning and the maintenance, and the hidden dangers are removed to be the maintenance. This compensates for damage caused by maintenance procedures such as: the maintenance of the circuit board damages the situation of three-proofing coating and the like, and avoids secondary faults caused by damage.
The frequency converter maintenance part comprises the following steps:
step one, electrifying for initial inspection, confirming a fault phenomenon, establishing files, disassembling, and switching to step two if the initial inspection is qualified, and switching to step three if the initial inspection is unqualified.
Step two, entering a cleaning workstation for deep cleaning; the second step comprises a front-stage preparation process and a deep cleaning process.
Wherein the preliminary preparation process includes: s2.1, blowing the whole machine by adopting dry compressed air with 7 atmospheric pressures, and then disassembling the whole machine.
S2.2, carrying out initial inspection on each part, including inspecting the heat-conducting silicone grease of the IGBT and the rectifier bridge, and replacing a silicone grease dry-cured person.
The deep cleaning process comprises the following processes: s2.3, performing 7-atmosphere dry compressed air wind bath blowing in a cleaning workstation until no dust is seen.
S2.4, sampling the stubborn attachments on the circuit board under an electron microscope with the power of more than 100 times, and carrying out a solubility analysis experiment on the taken stubborn attachment sample.
S2.5, performing concentrated high-pressure removal on all parts, adopting a water pressure fine water column of more than 7 kilograms for concentrated time-adding point injection, and then blowing the parts by using steam of 7 kilograms with pressure of 120 ℃.
And S2.6, according to the soluble diagnosis result of the step S2.4, adopting one or more of multi-enzyme acidic or alkaline cleaning solutions to respectively carry out chemical cleaning on stubborn attachments, and soaking part or all of the area of the component in a chemical agent.
S2.7, adopting alcohol to carry out oil removal and sterilization on the frequency converter component, and removing mould and the growing environment thereof.
S2.8, putting the components into a drying box, and carrying out air bath drying.
And S2.9, removing the white spots left after air bath blow drying, drying again, and placing under an electron microscope for inspection.
And step three, entering a maintenance program, and turning to the step two after the maintenance is finished.
And step four, performing three-proofing paint spraying on the circuit board part after the step two is completed, and drying.
And step five, cleaning stubborn stains of the circuit board, and soaking a part or all of the area.
Before the aging experiment of the components, the power supply board, the main control board and the interface board are respectively subjected to electrification inspection, the rectifier bridge and the IGBT are respectively subjected to voltage resistance and triggering inspection, the capacity and the voltage resistance of the electrolytic capacitor are inspected, the resistance value of the voltage-sharing resistor, the charging loop and the Hall current transformer are respectively inspected, and unqualified inspection is replaced or maintained.
And step six, performing an aging experiment on the components for 4-72 hours, and turning the components which fail through the aging experiment to step three and turning the components which pass the aging experiment to step seven.
Step seven, performing an aging experiment on the whole machine for 4-72 hours, and confirming no hidden danger when the whole machine is electrified with a current limit so as to avoid the possible hidden danger of the explosive machine when the whole machine is electrified for the first time after maintenance, and then confirming no hidden danger when the whole machine is electrified normally with a load, and turning to the step three if the whole machine is unqualified after the aging experiment; and (e) turning to the step eight when the whole machine aging test is qualified.
And step eight, checking and accepting, detecting functions and common functions used on the using site of the frequency converter, setting backup and pasting service identification by software, and making a maintenance report and filing.
And an environment maintenance part: the method comprises the improvement scheme of the environment of a power distribution room and a power cabinet; the method comprises the following steps:
and step nine, evaluating the dust condition of the installation environment of the frequency converter, checking the plugging condition of the power cabinet, and measuring the heat dissipation and ventilation effects.
And step ten, evaluating and calculating the conditions of the environment of the power distribution room, the ventilation of the power cabinet body and the dust filtration, and making and implementing an improvement scheme.
And step eleven, deeply cleaning dust in the power cabinet body.
And step twelve, inspecting the upper end and the lower end of the frequency converter on the installation site of the frequency converter, and installing the frequency converter after the step eight into the power cabinet.
Thirteen, carrying out 24-hour running follow-up on the frequency converter, feeding back and archiving follow-up information, perfecting cleaning reports and suggestions, and perfecting frequency converter archives.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (3)
1. A frequency converter service life prolonging deep maintenance process is characterized in that: the system comprises a frequency converter maintenance part and an environment maintenance part;
the frequency converter maintenance part: step one, electrifying for initial inspection, confirming a fault phenomenon, establishing files, disassembling, and switching to step two if the initial inspection is qualified, and switching to step three if the initial inspection is unqualified;
step two, entering a cleaning workstation for deep cleaning;
step three, entering a maintenance program, and turning to step two after the maintenance is finished;
step four, performing three-proofing paint spraying on the circuit board part after the step two is completed, and drying;
step five, cleaning stubborn stains of the circuit board; soaking part or all of the area;
step six, performing an aging experiment on the components for 4-72 hours, and transferring the components which fail through the aging experiment to step three, and transferring the components which are qualified through the aging experiment to step seven;
seventhly, performing an aging experiment on the whole machine for 4-72 hours, and confirming no hidden danger when the whole machine with the current limit is electrified so as to avoid the potential hidden danger of the explosive machine which is electrified for the first time after maintenance, and then normally electrifying with a load to confirm no hidden danger, and turning to the third step if the whole machine is unqualified after the aging experiment; step eight, the whole machine aging test is qualified;
checking and accepting, detecting functions and common functions used on the using site of the frequency converter, setting backup and pasting service identification by software, and making a maintenance report and filing;
and an environment maintenance part: the method comprises the improvement scheme of the environment of a power distribution room and a power cabinet; the method comprises the following steps:
step nine, evaluating the dust condition of the installation environment of the frequency converter, checking the blocking condition of the power cabinet, and measuring the heat dissipation and ventilation effects;
step ten, evaluating and calculating the environment of the power distribution room, the ventilation of the power cabinet body and the dust filtration condition respectively, and making and implementing an improvement scheme;
step eleven, deeply cleaning dust in the power cabinet body;
step twelve, inspecting the upper end and the lower end of the frequency converter on the installation site of the frequency converter, and loading the frequency converter after the step eight into a power cabinet;
and step thirteen, performing 24-hour operation follow-up on the frequency converter, feeding back and archiving follow-up information, perfecting cleaning reports and suggestions, and perfecting frequency converter archives.
2. The process for prolonging the service life and deeply maintaining the frequency converter according to claim 1, wherein: the second step comprises a front preparation process and a deep cleaning process, wherein the front preparation process comprises the following steps: s2.1, sweeping the whole machine by adopting dry compressed air with 7 atmospheric pressures, and then disassembling the whole machine;
s2.2, performing initial detection on each part, including detecting the heat-conducting silicone grease of the IGBT and the rectifier bridge and replacing a person with dry silicone grease;
the deep cleaning process comprises the following processes:
s2.3, performing 7-atmosphere dry compressed air wind bath blowing in a cleaning workstation until no dust is seen;
s2.4, sampling the stubborn attachments on the circuit board under an electron microscope with the power of more than 100 times, and carrying out a solubility analysis experiment on the taken stubborn attachment sample;
s2.5, performing concentrated high-pressure removal on all parts, performing concentrated time-adding point injection by adopting a water pressure fine water column of more than 7 kilograms, and then purging the parts by using 7 kilograms of steam with the pressure of 120 ℃;
s2.6, according to the soluble diagnosis result of the step S2.4, adopting one or more of multi-enzyme acidic or alkaline cleaning solutions to respectively carry out chemical removal on stubborn attachments, and soaking part or all areas of the part in a chemical agent;
s2.7, removing oil and sterilizing the frequency converter component by adopting alcohol, and removing mould and a growth environment thereof;
s2.8, putting the parts into a drying box, and carrying out air bath drying;
and S2.9, removing white spots left after air bath blow drying, drying again, and placing under an electron microscope for inspection.
3. The process for prolonging the service life and deeply maintaining the frequency converter according to the claim 1 or 2, is characterized in that: before the sixth step, the power supply board, the main control board and the interface board are respectively subjected to electrifying inspection, the rectifier bridge and the IGBT are respectively subjected to voltage resistance and triggering inspection, the capacity and the voltage resistance of the electrolytic capacitor are inspected, the resistance value of the voltage-sharing resistor, the charging loop and the Hall current transformer are respectively inspected, and unqualified inspection is replaced or maintained.
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