CN103837299A - Automatic torque wrench detecting system and method - Google Patents
Automatic torque wrench detecting system and method Download PDFInfo
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- CN103837299A CN103837299A CN201410131583.1A CN201410131583A CN103837299A CN 103837299 A CN103837299 A CN 103837299A CN 201410131583 A CN201410131583 A CN 201410131583A CN 103837299 A CN103837299 A CN 103837299A
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Abstract
The invention discloses an automatic torque wrench detecting system and method. The automatic torque wrench detecting system comprises a standard torque gauge, a working table, an executing mechanism and an electrical control system. The standard torque gauge is connected with the electrical control system through a signal line, and the electrical control system exerts torque on the executing mechanism by driving a servo motor. The executing mechanism comprises a planetary reducer arranged in a reducer cabinet, a fixed guide rail fixed onto the working table a sliding guide rail and a sliding baffle, wherein the sliding guide rail and the sliding baffle are arranged on the fixed guide rail. The electrical control system comprises an electrical control cabinet and an industrial personal computer cabinet, a displayer, a support and a manual operation platform, wherein the electrical control cabinet and the industrial personal computer control cabinet are arranged below the working table, the displayer and the support are fixed onto the working table and the manual operation platform is arranged on the front side of the working table. The torque wrench detecting system which is accurate and efficient is developed, and can detect the value of torque borne by a wrench in real time and send the value to an electrical control system to drive the servo motor so as to drive the reducer to exert torque.
Description
Technical field
The present invention relates to a kind of torque spanner automatic checkout system and detection method, can be used for automatic Verification, calibration and the test of torque spanner.
Background technology
Torque spanner is a kind of measurement instrument of tightening with torque measuring mechanism, and it is for fastening screw screw bolt and nut, and can measure the torque value while tightening, is therefore a kind of important utensil of controlling assembly precision; According to used power source, torque spanner is generally divided into manual, electronic, the pneumatic and large class of hydraulic pressure four; The reasons such as wherein manually torque spanner is simple in structure because of it, cheap and easy to use, application surface is the widest.
Along with China's industrial expansion, industrial technical level is more and more higher, also more and more higher to the requirement of product quality, and this makes in production assembling process the requirement to assembly technology also more and more harsh; Therefore, in recent years, the utilization of torque spanner in the industries such as Mould Machining, automobile making, communications and transportation and refitting manufacture is more and more extensive, and its quantity also goes up year by year.Torque spanner, as measurement instrument, must regularly exercise supervision to it and calibrate, so there is huge detection demand.
Torque spanner calibration equipment is in the past nearly all manual detecting device for determining torque of spanner.This device is conventionally counted the modules such as extraction system by handwheel, screw mandrel (reductor), arm lever, standard torquemeter and single-chip microcomputer and is formed; Rely on manpower, shake handwheel, drives screw mandrel (reductor) to rotate, thereby arm lever is rotated, and tested torque spanner is applied to moment of torsion, and this torque value is arrived by single-chip microcomputer system acquisition by standard torquemeter, can record peak value and pursuit gain etc.Although the calibrating instrument of the type is simple in structure, cheap, there is following deficiency:
(1), the large each loading of labour intensity must rotate handwheel by manpower and complete, in the time of calibrating wide range torque spanner (such as 3000Nm), handwheel is very heavy, needs testing person to possess very large arm strength and very strong endurance.
(2), the large each calibrating of indicating value poor repeatability, the error of indication is during to peaking or predetermined torque value, the handwheel that must stop operating, testing person's difference, operating habit difference, the differences such as individual's reflection speed difference, all can bring gauging error.
(3) the single range setting that, such calibrating instrument of function singleness often adopts, an i.e. calibrating instrument, only configure a moment of torsion regulator, if want to meet the calibrating of all torque spanners in 10Nm～3000Nm range section, must configure so a series of calibrating instrument, purchase total price high, take testing laboratory space large.
(4), magnitude tracing inconvenience is because this type device adopts Single Chip Microcomputer (SCM) system conventionally, not not independent adjustable secondary instrument, can only remove the standard torquemeter on device censorship separately, its cable splice does not often mate with the instrument of testing agency, connects inconvenience and can introduce error.
Summary of the invention
The object of the invention is to overcome existing above-mentioned deficiency in prior art, a kind of torque spanner automatic checkout system and detection method of precise and high efficiency is provided.
In order to realize foregoing invention object, the invention provides following technical scheme:
A kind of torque spanner automatic checkout system, comprise standard torquemeter 7, work top 11, topworks and electric control system, described standard torquemeter 7 is connected with electric control system by signal wire, and described electric control system is by driving servomotor 13 to apply moment of torsion to topworks.
Described topworks comprises the planetary reducer 12 that is arranged in deceleration rack 9, is fixed on the fixed guide 6 on work top 11 and is arranged on rail plate 14 and the slide damper 4 on fixed guide 6;
Described servomotor 13 is connected with planetary reducer 12 by transmission shaft, planetary reducer 12 is vertically mounted on work top 11 times by connecting bushing 72 and through work top the bolt that is connected with planetary reducer top, and connecting bushing 72 tops connect the standard torquemeter 7 of positioned vertical on work top 11; Described detected torque spanner 5 one end are fixed on standard torquemeter 7, and the other end is placed on rail plate 14, have the fixed part of fixing detected torque spanner 5 on standard torquemeter 7 and rail plate 14.
Described electric control system is arranged in the electrical control cabinet 1 and industry control rack 10 under work top 11, and electric control system also comprises the display being fixed on work top 11, the manual operating platform 2 that is arranged on work top front side.
In described industry control rack 10, be equiped with industrial computer, described industrial computer be installed in servomotor 13, servo controller, reactor, wave filter, PLC, data collecting card and the contactor electric control system in series in electrical control cabinet 1, and be connected with standard torquemeter 7 and display by signal wire.
Described standard torquemeter 7 is made up of torque sensor 71 and accurate secondary instrument, and the moment of torsion data that collect are passed to torque sensor 71 by described secondary instrument, and the industrial computer of electric control system passed to data by signal wire by torque sensor.
Described standard torquemeter 7 has the specification of 6 kinds of different ranges, and range covers 5Nm～3000Nm.
On described slide damper 4, be provided with the little supporting plate can vertical direction moving up and down, described slide damper 4 and little supporting plate are designed with tie down screw 15 on all.
Described work top 11 is integral plates that a thickness is more than or equal to 20mm.
Described rail plate 14 is T-shape structural design.
As preferred version of the present invention, described servomotor 13 is connected the loading to topworks with planetary reducer 12 by transmission shaft, adopt the higher wheel shaft load mode of accuracy, has increased the precision in loading procedure controlled.
As preferred version of the present invention, described standard torquemeter 7 has the specification of 6 kinds of different ranges, range covers 5Nm～3000Nm, unique design by torque sensor 71 with switching axle sleeve 72, can change by fast insert-pull, convenient and swift, improve accuracy of detection, detect broad covered area, work efficiency improves greatly.
As preferred version of the present invention, on described slide damper 4, be provided with the little supporting plate can vertical direction moving up and down, described slide damper 4 and little supporting plate are designed with tie down screw 15 on all; Slide damper can regulate the position of lateral stressed point in real time, and on slide damper 4, the little supporting plate of design is mixed moving under can in the vertical direction, guarantees that tested spanner is in horizontality; Slide damper and little supporting plate are all designed with tie down screw, locate for quick locking.
As preferred version of the present invention, described rail plate 14, for T-shape designs, has very high bending resistance twisting strength, simple in structure, and easy making process is easy to loading and unloading, and unlike spherical guide, needs meticulously to safeguard.
Described detected torque spanner 5 when mounted, needs to adjust the height of the little supporting plate in slide damper 4, guarantees that detected torque spanner is parallel with work top, and the cylinder of slide damper leans against the loading groove place of torque spanner.
The concrete grammar that the present invention realizes automatic detection torque spanner is: after described detected torque spanner 5 is in place, standard torquemeter 7 can detect the torque value that this spanner is suffered in real time, and this value is sent to electric-control system, drive servomotor 14, drive reductor to apply moment of torsion, in the time arriving default torque value, motor is in low-speed motion mode to keep the default value of applying, if capture peak value, Self-tipping is got back to zero point.
Described electric-control system drives the process of servomotor, is completed by the preset mode on industrial computer.
Described preset mode mainly comprises presetting system, indicating value style, data management, data maintenance, five functional modules of systematic parameter, the overall process that the manual torque spanner of having contained detects.There is peak value to catch and two kinds of algorithms of Steam Generator in Load Follow, respectively corresponding presetting system and two kinds of test models of indicating value style.
Presetting system pattern is mainly used in the detection of presetting system torque spanner, and under this pattern, system can be according to the variation of indicating value, and automatic decision also catches peak value, and then Self-tipping, to zero point, completes loaded cycle one time automatically; Detect data by oneself, directly in certificate format, draw the performance assessment criteria such as the error of indication, indicating value repeatability.User also can set arbitrarily cycle index, without manual intervention.
Indicating value style pattern is mainly used in the detection of the instruments such as Digital-display torque spanner, pointer torque spanner, multiplier and torque sensor.User can freely preset some load(ing) points, and presets the retention time of loading while arriving preset, so that user reads the indicating value on torque spanner digital display or on scale, and by its input system; System has also been set up equipment management data storehouse, facilitates user to inquire about the various information of tested equipment.
Data processing: after load adds and unloaded, can enter data processing module, the data of this detection are finished dealing with, only need fill in the relevant information such as censorship unit, product specification, after preservation, clicks " closing " and exits.
Setting parameter: set motor loading velocity, by parameters such as the loading load point of test examination instrument, before starting to detect, must determine set systematic parameter.
Data maintenance: the operation such as the detection data after all preservations all can be inquired about, revised in this module, printing.
Compared with prior art, the present invention has following beneficial effect:
1, high, the broad quantum of accuracy: system accuracy is 0.3%; The moment of torsion regulator of 6 different ranges of configuration, range covers 5Nm～3000Nm;
2, simple operation, work efficiency are high: possess manually and automatic two kinds of operator schemes, freely switch; Loading velocity is adjustable, automatically completes the uninstall process that adds of arbitrary number of times, without manual intervention;
3, wide application: can detect presetting system torque spanner, pointer torque spanner and Digital-display torque spanner, even comprise lower than 0.5 grade of torque sensor.Can select corresponding mode of operation and data unit according to the classification of spanner;
4, compact conformation, good stability: adopt planetary reducer wheel shaft load mode, course of work noise is extremely low, operates steadily, and integral rigidity is large, and system stability is good;
5, system extension is strong: can be according to user's request, select touch screen operation mode or PC mode of operation; PC mode of operation disposes the professional annex such as function software, printer, can realize the one-stop flow processs such as collection, processing, storage, inquiry and the printing certificate of data;
6, system can magnitude tracing: every the moment of torsion regulator configuring and machine system all pass through assay approval while dispatching from the factory, need to can provide corresponding calibration certificate as user has.
Accompanying drawing explanation:
Fig. 1 is the structural representation of torque spanner automatic checkout system of the present invention.
Fig. 2 is torque sensor external member structure schematic diagram.
Fig. 3 is rail plate of the present invention, slide damper and fixed guide syndeton schematic diagram.
1-electrical control cabinet, 2-manual operating platform, 3-display and support, 4---slide damper, 5---tested torque spanner, 6---fixed guide (another with add long guideway), 7---standard torquemeter (can fast insert-pull change), 8---keyboard and mouse drawer, 9---deceleration rack, 10---industry control rack, 71-torque sensor, 72-switching bearing, 11-work top, 12-planetary reducer, 13-servomotor, 14-rail plate, 15-tie down screws.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.But this should be interpreted as to the scope of the above-mentioned theme of the present invention only limits to following embodiment, all technology realizing based on content of the present invention all belong to scope of the present invention.
Torque spanner automatic checkout system as shown in Figures 1 to 3, comprise standard torquemeter 7, work top 11, topworks and electric control system, described standard torquemeter 7 is connected with electric control system by signal wire, and described electric control system is by driving servomotor 13 to apply moment of torsion to topworks.
Described topworks comprises the planetary reducer 12 that is arranged in deceleration rack 9, is fixed on the fixed guide 6 on work top 11 and is arranged on rail plate 14 and the slide damper 4 on fixed guide 6; Described servomotor 13 is connected with planetary reducer 12 by transmission shaft, planetary reducer 12 is vertically mounted on work top 11 times by connecting bushing 72 and through work top the bolt that is connected with planetary reducer top, and connecting bushing 72 tops connect the standard torquemeter 7 of positioned vertical on work top 11; Described detected torque spanner 5 one end are fixed on standard torquemeter 7, and the other end is placed on rail plate 14, have the fixed part of fixing detected torque spanner 5 on standard torquemeter 7 and rail plate 14.
Described electric control system is arranged in the electrical control cabinet 1 and industry control rack 10 under work top 11, and electric control system also comprises the display being fixed on work top 11, the manual operating platform 2 that is arranged on work top front side.
In described industry control rack 10, be equiped with industrial computer, described industrial computer be installed in servomotor 13, servo controller, reactor, wave filter, PLC, data collecting card and the contactor electric control system in series in electrical control cabinet 1, and be connected with standard torquemeter 7 and display by signal wire.
Described standard torquemeter 7 is made up of torque sensor 71 and accurate secondary instrument, and the moment of torsion data that collect are passed to torque sensor 71 by described secondary instrument, and the industrial computer of electric control system passed to data by signal wire by torque sensor.
Described standard torquemeter 7 has the specification of 6 kinds of different ranges, and range covers 5Nm～3000Nm.
On described slide damper 4, be provided with the little supporting plate can vertical direction moving up and down, described slide damper 4 and little supporting plate are designed with tie down screw 15 on all.
Described work top 11 is integral plates that a thickness is more than or equal to 20mm, and as preferably, the present embodiment is elected the integral plate that 30mm is thick as.
Described rail plate 14 designs for T-shape.
In this enforcement, this device Design cooling load is 3000Nm, for reducing the power of servomotor, therefore selects three-stage planetary speed reducer, and reduction gear ratio is up to 1280:1, and specified output torque is 3700Nm, and max. output torque is 7400Nm, completely competent; In general, effective use range of torque sensor is its full scale 20%～100%, for the accuracy of measuring of assurance system in 3000Nm gamut, must configure a series of high precision standard torquemeters, therefore designed fast interface, the base of torque gauge, through specific customization, is embedded on speed reducer output shaft, coordinate closely, can not produce and rock.
Electric control system part is by elaborate servo motor, servo controller, reactor, wave filter, and the electric attachments compositions such as Schneider PLC, standard torquemeter, data collecting card, industrial computer, display and contactor, realize moment of torsion closed-loop control.(1) the single load time is comparatively suitable about 30 seconds; Too slowly, can affect work efficiency, can bring impact to torque spanner structure too soon, and produce certain error.When this just requires just to have started, loading velocity is very fast, while approaching preset value, reduces speed now; When calibrating presetting system torque spanner, capture peak value, fast discharging is to zero point; When calibrating digital display or pointer torque spanner, be stabilized in preset value, until accept next step operational order.User can be according to use habit and detected object loading velocity is difference set flexibly; (2) the judgment threshold agent structure that should allow user that presetting system torque spanner is set voluntarily that peak value catches is a leverage, and in the time that its suffered moment of torsion arrives preset value, lever will slide suddenly, send " " a sound loud and clear.This parameter is just for peak value judgement, and the value (or drop range) of falling that can torque signal that established standards torque gauge gathers is peak value judgment threshold, and the slope that also can set moment of torsion loading curve is judgment threshold.Due to the presetting system torque spanner mechanism characteristics difference of each producer, change in torque before and after peak value varies, and torque spanner is similar to elastic lever in loading procedure, rock or distortion can produce indicating value fluctuation, if the judgment threshold of systemic presupposition is excessive, can leak peak value, too smallly can produce erroneous judgement, now just require user to be revised according to the characteristic of checked object.
Software section: upper computer software adopts C#2008 establishment, mainly comprises and detects test, data management, 3 functional modules of tested equipment control, the instrument of setting up management database employing is Access2003.The overall process that the manual torque spanner that software has been contained detects, has peak value to catch and Steam Generator in Load Follow two kinds of operator schemes.Peak value trap mode is mainly used in the detection of presetting system torque spanner, in particular cases also can be used as limit load (destructiveness) test of other members; Under this pattern, system can be according to the variation of indicating value, and automatic decision also catches peak value, and then Self-tipping, to zero point, completes loaded cycle one time automatically; System default is prestrain 3 times, automatically loads 3 times, and data by oneself, directly draw the performance assessment criteria such as the error of indication, indicating value repeatability in certificate format.User also can set arbitrarily cycle index, is similar to the torture test of doing torque spanner, and without manual intervention.Steam Generator in Load Follow pattern is mainly used in the detection of Digital-display torque spanner and pointer torque spanner.User can freely preset some load(ing) points, and presets the retention time of loading while arriving preset, so that user reads the indicating value on torque spanner digital display or on scale, and by its input system, is using data processing.
System has also been set up equipment management data storehouse, and the various information that facilitate user to inquire about tested equipment, as specification number, calibration interval prompting, historical data contrast etc.Wherein historical data comparing function is extremely important, and system can be drawn out the change curve of tested equipment operating characteristic thus, can help user to understand at any time the state of tested equipment, safeguards in time, prevents from damaging.
The detection system of PC control formula is applicable to possess metering testing agency and the enterprise of good testing laboratory environment, and the detection data of torque spanner can access the existing Test database system of the other side, sets up into a unified detection management system.
In addition, according to the difference of user's use occasion and custom, designed separately the detection system of configuration touch screen operation formula, simple and quick, be applicable to the occasions such as factory floor.
Test result: after device completes, the gauging instrument such as standard torquemeter, data collecting instrument has all carried out magnitude tracing, and machine system has been carried out to uncertainty evaluation, and result meets 0.3 grade, can be used as standard set-up, carry out 1 grade of following manually calibrating, calibration operation of torque spanner.
To the east of safe board NL760 type torque spanner be checked object, carried out test of many times, the data that obtain are processed, the results are shown in Table 1.
Table 1NL760 type torque spanner calibrating data
In the same way, east safe board NL3000 type torque spanner is detected, result is as shown in table 2.
Table 2NL3000 type torque spanner calibrating data
The accuracy rating that dispatches from the factory of two NL type torque spanners is ± 3%, all qualified from visible two torque spanners of upper table, and their relative error of indicating value is all in 2% scope, and indicating value repeatability better.This illustrates that this calibrating instrument integral rigidity is good, and the deflection of whole torque loading mechanism is very little, and guarantee is by the indicating value repeatability index of test examination instrument; And for relative error of indicating value, can be revised by the calibration to standard torquemeter.
Accurately the software algorithm step of moment of torsion control is as follows:
1, system, according to the loading direction of setting, is rotated with a higher speed actuating motor of setting, and the monitoring of starting torque value;
2, when torque value approach set load torque value 20% time, control motor and rotate operation with a middle-grade speed;
3,, in the time that torque value approaches the fluctuation range of setting loading torque value, control motor and rotate operation with a geared-down speed;
4, when torque value approach set load torque value maintain range of stability time, control motor a very low speed rotate operation;
5, system stability reaches behind setting-up time interval, ejects the dialog box of user's input torque spanner reading;
6, user inputs after reading, after system-computed error save data, enters next load(ing) point and detects.
Claims (9)
1. a torque spanner automatic checkout system, it is characterized in that: comprise standard torquemeter (7), work top (11), topworks and electric control system, described standard torquemeter (7) is connected with electric control system by signal wire, and described electric control system is by driving servomotor (13) to apply moment of torsion to topworks;
Described topworks comprises the planetary reducer (12) that is arranged in deceleration rack (9), is fixed on the fixed guide (6) on work top (11) and is arranged on rail plate (14) and the slide damper (4) on fixed guide (6);
Described servomotor (13) is connected with planetary reducer (12) by transmission shaft, planetary reducer (12) is vertically mounted under work top (11) by connecting bushing (72) and through work top the bolt that is connected with planetary reducer top, and connecting bushing (72) top connects the standard torquemeter (7) of positioned vertical on work top (11); Described tested torque spanner (5) one end is fixed on standard torquemeter (7), it is upper that the other end is placed on rail plate (14), and standard torquemeter (7) and rail plate (14) are provided with the fixed part of fixing tested torque spanner (5).
Described electric control system is arranged in the electrical control cabinet (1) and industry control rack (10) under work top (11), and electric control system also comprises the display being fixed on work top (11), the manual operating platform (2) that is arranged on work top front side.
2. torque spanner automatic checkout system according to claim 1, it is characterized in that: industry control rack is equiped with industrial computer in (10), described industrial computer and the servomotor (13), servo controller, reactor, wave filter, PLC, data collecting card and the contactor electric control system in series that are installed in electrical control cabinet (1), and be connected with standard torquemeter (7) and display by signal wire.
3. torque spanner automatic checkout system according to claim 1, it is characterized in that: described standard torquemeter (7) is made up of torque sensor (71) and accurate secondary instrument, the moment of torsion data that collect are passed to torque sensor (71) by described secondary instrument, and the industrial computer of electric control system passed to data by signal wire by torque sensor;
Described standard torquemeter (7) has the specification of 6 kinds of different ranges, and range covers 5Nm ~ 3000Nm.
4. torque spanner automatic checkout system according to claim 1, it is characterized in that: on described slide damper (4), be provided with the little supporting plate can vertical direction moving up and down, described slide damper (4) and little supporting plate are designed with tie down screw (15) on all.
5. torque spanner automatic checkout system according to claim 1, is characterized in that: described work top (11) is the integral plate that a thickness is more than or equal to 20mm.
6. torque spanner automatic checkout system according to claim 1, is characterized in that: described rail plate (14) is T-shape structural design.
7. as described in one of claim 1-6, utilize torque spanner automatic checkout system to carry out a detection method for torque spanner, it is characterized in that:
Described torque spanner automatic checkout system detection method is: described detected torque spanner (5) is installed to standard torquemeter (7) and goes up also axially parallel with work top with rail plate (14), standard torquemeter (7) detects the torque value that this spanner is suffered in real time, and this value is sent to electric-control system, drive servomotor (13) to drive reductor to apply moment of torsion, in the time arriving default torque value, motor in low-speed motion mode to keep the default value of applying, if capture peak value, Self-tipping is got back to zero point, form an accurate closed-loop system of controlling,
Described electric-control system drives the process of servomotor, is completed by the preset mode on industrial computer;
Described preset mode mainly comprises presetting system, indicating value style, data management, data maintenance, five functional modules of systematic parameter, the overall process that the manual torque spanner of having contained detects.
8. the detection method of utilizing torque spanner automatic checkout system to carry out torque spanner according to claim 7, is characterized in that:
Described detected torque spanner (5) when mounted, need to adjust the height of the little supporting plate in slide damper (4), guarantee that detected torque spanner is parallel with work top (11), the cylinder of slide damper (4) leans against the loading groove place of torque spanner.
9. the detection method of utilizing torque spanner automatic checkout system to carry out torque spanner according to claim 7, is characterized in that:
Described torque spanner detection system is provided with manual control button, in the time that system breaks down, can click after this button, utilizes manual operating platform (2) to control.
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| CN104132766A (en) * | 2014-08-01 | 2014-11-05 | 昆山市创新科技检测仪器有限公司 | High-precision torque detection device |
| CN104132766B (en) * | 2014-08-01 | 2017-01-11 | 昆山市创新科技检测仪器有限公司 | High-precision torque detection device |
| CN107255538A (en) * | 2017-05-05 | 2017-10-17 | 常州市计量测试技术研究所 | Second peak monitoring device and method in presetting system torque spanner use |
| CN107290103A (en) * | 2017-06-05 | 2017-10-24 | 中国计量科学研究院 | Multi-functional reference formula standard torquer |
| CN108036892A (en) * | 2017-10-17 | 2018-05-15 | 苏州莱测检测科技有限公司 | A kind of double-range torque spanner calibrating instrument |
| CN109297524A (en) * | 2018-07-04 | 2019-02-01 | 湖北三环汽车方向机有限公司 | Mechanical diverter assembling detection device |
| CN109297524B (en) * | 2018-07-04 | 2023-09-12 | 湖北三环汽车方向机有限公司 | Mechanical steering gear assembly detection device |
| CN111381115A (en) * | 2018-12-28 | 2020-07-07 | 海太半导体（无锡）有限公司 | Electrical test equipment centralized control system |
| CN110987292A (en) * | 2019-12-10 | 2020-04-10 | 上海精密计量测试研究所 | Automatic calibrating device and method for torque wrench |
| CN114279627A (en) * | 2021-12-14 | 2022-04-05 | 陕西航空电气有限责任公司 | Synchronous metering instrument |
| CN114593930A (en) * | 2022-03-24 | 2022-06-07 | 华能吉林发电有限公司长春热电厂 | Equipment maintenance management system device of thermal power plant |
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