CN101941623B - Traction machine detection or diagnosis system - Google Patents
Traction machine detection or diagnosis system Download PDFInfo
- Publication number
- CN101941623B CN101941623B CN201010298357.4A CN201010298357A CN101941623B CN 101941623 B CN101941623 B CN 101941623B CN 201010298357 A CN201010298357 A CN 201010298357A CN 101941623 B CN101941623 B CN 101941623B
- Authority
- CN
- China
- Prior art keywords
- signal
- controller
- towing machine
- analysis
- sensor
- 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.)
- Active
Links
Images
Landscapes
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention provides a traction machine detection or diagnosis system, which comprises a sensor, a conditioning circuit, a data acquisition circuit and a controller which are sequentially connected. The sensor is used for detecting a status signal of the traction machine and transmitting the status signal to the conditioning circuit; the conditioning circuit is used for receiving the detected status signal and transmitting a switching signal which corresponds to the status signal to the data acquisition circuit; the data acquisition circuit is used for acquiring the switching signal and transmitting the acquired signal to the controller; and the controller is used for processing and displaying the status information of the traction machine. The traction machine detection or diagnosis system has the advantages of acquiring and processing the status signal of the traction machine, displaying the diagnosis result, specially detecting the status information of the traction machine, along with low cost and good monitoring effect.
Description
Technical field
The present invention relates to towing machine work monitoring technical field, particularly a kind of towing machine detects or diagnostic system.
Background technology
Elevator, as the important component part of national economy and life, is modern society people work and the common tool of living.Towing machine, as the major part of traction elevator, is called again main frame, is the power source of elevator, is also the critical component of elevator.The performance of towing machine is directly, significantly on the impact of elevator complete machine, be the performance of the towing machine speed that directly affects elevator, play the indexs such as braking acceleration-deceleration, flat bed and the traveling comfort of taking, safety, reliability of operation, therefore, each towing machine to be dispatched from the factory is carried out to strict test, and it is all necessary work that the towing machine of place in operation is carried out to periodic inspection.
Traditional security monitoring be take people's maintenance as main, observes machine oil situation, or fault goes to safeguard after occurring again by the time.
At present, elevator detecting instrument be take whole elevator device as main on the market, and measuring position is mainly in car.Domestic AETE elevator safety unit test instrument, AETE lift acceleration detector and the DT-3/DT-4 lift acceleration detector of mainly containing, external have EVA-625 vibration of elevator analysis system, EVA vibration analysis instrument and a LiftPC system.There is following technological deficiency in existing detector: first, for the fault detection system of whole elevator, test position is mainly arranged among car; Secondly, it is proprietary system, and the secondary development of system is lower; Again, it is expensive, cost is high for existing tester; Finally, software interface hommization is not enough, complicated operation, is not easy to service personnel and operates.
Summary of the invention
In order to solve existing technical matters, the invention provides a kind of towing machine and detect or diagnostic system, it gathers the status signal of towing machine, and processes, and then shows diagnostic result, is exclusively used in the status information that detects towing machine, and cost is low, monitoring effect good.
The present invention solves existing technical matters, provides a kind of towing machine to detect or diagnostic system, and described towing machine detects or diagnostic system comprises sensor, modulate circuit, data acquisition circuit and the controller being linked in sequence; Described sensor, for detection of the status signal of towing machine, and is sent to described modulate circuit by this status signal; Described modulate circuit, for the status signal that receives detection with send the change over signal corresponding with this status signal to data acquisition circuit; Described data acquisition circuit, for Collect conversion signal, and is sent to controller by collection signal; Described controller, for the treatment of the status information with showing towing machine.
Further improvement of the present invention is as described below.
Described sensor comprises acceleration pick-up, temperature sensor, tachogen and current sensor.
Described acceleration pick-up is IEPE acceleration pick-up; Described modulate circuit is described IEPE acceleration pick-up power supply.
Described change over signal is voltage signal; Described modulate circuit converts detection signal to voltage signal, after signal amplification and filtering, exports data acquisition circuit to.
Described controller is compared the contrast signal of pre-stored in the collection signal of reception and described controller, judges that detected towing machine vibration vibrational state is for normal or abnormal.
Compared to prior art, the invention has the beneficial effects as follows: gather the status signal of towing machine, and process, then show diagnostic result, be exclusively used in the status information that detects towing machine, cost is low, monitoring effect good.
The present invention solves existing technical matters, a kind of method that provides towing machine to detect or diagnose, and the method comprises the following steps: sensor detects the status signal of towing machine, and this status signal is sent to modulate circuit; Described modulate circuit receiving condition signal, and change, then change over signal is sent to data acquisition circuit; Described data acquisition circuit Collect conversion signal, and this collection signal is sent to controller; The status information of towing machine is processed and shown to described controller.
Further improvement of the present invention is as described below.
Described controller carries out time domain or frequency-domain analysis to collection signal, and with described controller in the contrast signal of pre-stored compare, generate diagnosis report and show.
Described sensor is acceleration pick-up, temperature sensor, tachogen and current sensor.
Described controller carries out power spectrum, power density spectrum, wavelet transformation, cepstrum or Envelope Analysis to collection signal, and with described controller in the contrast signal of pre-stored compare, generate diagnosis report and show.
Described controller carries out the analysis of nargin, kurtosis, peak index, pulse index, peak value, mean effective value.
Compared to prior art, the invention has the beneficial effects as follows: gather the status signal of towing machine, and process, then show diagnostic result, be exclusively used in the status information that detects towing machine, cost is low, monitoring effect good.Gather vibration signal, temperature signal, tach signal and current signal simultaneously, retrieve towing machine state comprehensively and monitor and Accurate Diagnosis dependent failure.
Accompanying drawing explanation
Fig. 1 is the structural representation of towing machine detection of the present invention or diagnostic system.
Fig. 2 is the structural representation that controller of the present invention shows information.
The specific embodiment
Below in conjunction with accompanying drawing explanation and the specific embodiment, the present invention is further described.
As depicted in figs. 1 and 2, a kind of towing machine detects or diagnostic system, and this towing machine detects or diagnostic system comprises sensor, modulate circuit 14, data acquisition circuit 15 and the controller being linked in sequence; Sensor, for detection of the status signal of towing machine, and is sent to modulate circuit 14 by this status signal; Modulate circuit 14, for the status signal that receives detection with send the change over signal corresponding with this status signal to data acquisition circuit 15; Data acquisition circuit 15, for Collect conversion signal, and is sent to controller by collection signal; Controller, for the treatment of the status information with showing towing machine, the Real-time Collection information that this status information is towing machine, or be the analytical information of towing machine.
Sensor of the present invention comprises acceleration pick-up 11, temperature sensor 12, tachogen 13 and current sensor 17, the status signal of towing machine comprises acceleration signal, temperature signal and tach signal, the corresponding vibration signal that detects of this acceleration pick-up, the corresponding detected temperatures signal of temperature sensor, the corresponding tach signal that detects of tachogen, the corresponding sensed current signal of current sensor, acceleration pick-up is arranged on the drop-gear box of towing machine, drg, on electrical motor or base, temperature sensor is mainly arranged on the drop-gear box of towing machine, on drg or electrical motor, tachogen is arranged on the input shaft of towing machine drop-gear box, current sensor is arranged on the electrical motor or drg of towing machine.This acceleration pick-up 11 is IEPE acceleration pick-up; When modulate circuit 14 is connected with IEPE acceleration pick-up, not only receive acceleration signal, also for IEPE acceleration pick-up provides electric energy.
Change over signal of the present invention is voltage signal; Modulate circuit 14 converts detection signal to voltage signal, after signal amplification and filtering, exports data acquisition circuit 15 to.
Controller of the present invention is compared the contrast signal of pre-stored in the collection signal of reception and controller, judges that detected towing machine running state is for normal or abnormal.This controller can directly be selected PC computer.
The present invention gathers the status signal of towing machine, and processes, and then shows diagnostic result, is exclusively used in the status information that detects towing machine, and cost is low, monitoring effect good.
As depicted in figs. 1 and 2, a kind of method that towing machine detects or diagnoses, the method comprises the following steps: sensor detects the status signal of towing machine, and this status signal is sent to modulate circuit; Modulate circuit 14 receiving condition signals, and change, then change over signal is sent to data acquisition circuit 15; Data acquisition circuit 15 Collect conversion signals, and this collection signal is sent to controller; The status information of towing machine is processed and shown to controller.
Controller of the present invention carries out time domain or frequency-domain analysis to collection signal, and with described controller in the contrast signal of pre-stored compare, generate diagnosis report and show, this analysis is monolateral Fourier transform.This controller can directly be selected PC computer.
Sensor of the present invention is acceleration pick-up 11, temperature sensor 12, tachogen 13 and current sensor 17.
Controller of the present invention carries out power spectrum, power density spectrum, wavelet transformation, cepstrum or Envelope Analysis to collection signal, and with described controller in the contrast signal of pre-stored compare, generate diagnosis report and show.The diagnosis report that this signal analysis draws can further be got rid of non-plain fault.
Diagnosis report of the present invention has three kinds of generation approach: the first, directly by controller, collection signal is carried out to time domain or frequency-domain analysis, and with described controller in the contrast signal of pre-stored compare, generate diagnosis report; The second, directly carries out power spectrum, power density spectrum, wavelet transformation, cepstrum or Envelope Analysis by controller to collection signal, and with described controller in the contrast signal of pre-stored compare, generate diagnosis report; The third, first carry out time domain or frequency-domain analysis by controller to collection signal, and with described controller in the contrast signal of pre-stored compare, generate one time diagnosis report; After by controller, collection signal is carried out to power spectrum, power density spectrum, wavelet transformation, cepstrum or Envelope Analysis, and with described controller in the contrast signal of pre-stored compare, generate secondary diagnosis report.Above three kinds of modes that generate diagnosis report can be by the free choice for use of user.
Controller of the present invention carries out nargin, kurtosis, peak index, pulse index, the peak value of status signal, the analysis of mean effective value.
The present invention gathers the status signal of towing machine, and processes, and then shows diagnostic result, is exclusively used in the status information that detects towing machine, and cost is low, monitoring effect good.
Towing machine of the present invention detects or diagnostic system has a monitoring science, real-time to the operation conditions of towing machine, guarantees that fault was found before occurring, and reduces the personal casualty that elevator faults causes, and plays the effect of prevention; The equipment of et out of order is diagnosed simultaneously, realized the diagnosis of not unpacking, help maintainer to find as early as possible trouble point, safeguard in time.
The human-computer interaction interface of towing machine controller of the present invention, comprises following content:
1) login of system, input username and password;
2) setting of system parameter, arranges relevant towing machine information and data acquisition information;
3) the main interface of system, carries out the switching that data acquisition, data analysis, system are exited;
4) data acquisition interface, gathers multi-channel status signal, temperature signal and tach signal, and shows in real time and record, automatically generates simple diagnosis report while exiting;
5) data analysis interface, carries out power spectrum, power density spectrum, wavelet transformation, cepstral analysis, Envelope Analysis to the signal of record, and analyzes the information such as its nargin, kurtosis, peak index, pulse index, peak value, mean effective value;
6) menu setting, revises log-on message, comprises and revises login password and login user password.
Towing machine of the present invention detects or diagnostic system, is a multi-channel state signal collecting and Analysis on Fault Diagnosis system.System utilizes sensor and modulate circuit 14 that the status signal of elevator traction machine is converted to voltage signal, and data acquisition circuit 15 gathers voltage signal and imports in controller.System can be carried out real time data demonstration, data analysis and diagnosis report and be generated, data to the running condition of elevator under different operating modes compare analysis, study the movement characteristic under different operating modes, the operation characteristic of particularly malfunction situation, the Analysis on Fault Diagnosis of foundation to towing machine, with trouble diagnosing and the condition monitoring to elevator traction machine and even whole elevator motion system.
Signal analysis technology has adopted the analysis method of monolateral Fourier transform, wavelet transformation, cepstral analysis, power spectrum and power density spectrum.
Native system is domestic first elevator traction machine fault localization system, current product both domestic and external is nearly all the checking system for lift car acceleration/accel or elevator traction machine torsional oscillation, it is nearly all the debugging that is applied to elevator, and price is very high, and the professional proprietary test macro for elevator all parts fault seldom.Native system is tested mainly for the main frame-elevator traction machine of elevator, utilizes science of mathematics, computer science and electronics science to realize the trouble diagnosing to elevator traction machine.
System has reduced repair and maintenance personnel's working strength, has improved work efficiency.System adopts modern test technology, realized elevator traction machine is not unpacked and carried out trouble diagnosing, repair and maintenance personnel are no longer as traditional maintenance, all parts is taken apart and investigated, and only need utilize system directly to find out fault, safeguard, greatly improved work efficiency and reduced working strength.
System has realized the assessment to elevator traction machine running state, improved the safety of elevator operation, system not only can realize the diagnosis to elevator traction machine fault, utilize the analysis of its image data, can also analyze the state of its operation, as the running state before fault, in advance equipment is carried out to repair and maintenance, dropping to of fault is minimum.
System has exploration, can carry out secondary development, and this system and development platform thereof have open system, and system can be carried out personalize development according to user, and user also can utilize native system to carry out secondary development.
The resolution of system is high, and Hz-KHz is wide, 16 of the resolutions of system, and Hz-KHz can reach 0.5 to 10k Hz.
System price is cheap, cost is low, and market efficiency is good.
Compare other software and proprietary software, system price on software and hardware all has certain advantage.
Detection of the present invention or diagnostic system and method also can further be exclusively used in the change speed gear box of towing machine, running state to change speed gear box detects, then signal is changed, gathers, analyzed and compares, thereby monitor in real time the mode of operation of towing machine change speed gear box.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (1)
1. towing machine detects or a diagnostic system, it is characterized in that, comprises the sensor, modulate circuit, data acquisition circuit and the controller that are linked in sequence; Described sensor, for detection of the status signal of towing machine, and is sent to described modulate circuit by this status signal; Described sensor comprises acceleration pick-up, temperature sensor, tachogen and current sensor, the corresponding vibration signal that detects of this acceleration pick-up, the corresponding detected temperatures signal of temperature sensor, the corresponding tach signal that detects of tachogen, the corresponding sensed current signal of current sensor; Acceleration pick-up is arranged on drop-gear box, drg, electrical motor or the base of towing machine, temperature sensor is arranged on drop-gear box, drg or the electrical motor of towing machine, tachogen is arranged on the input shaft of towing machine drop-gear box, and current sensor is arranged on the electrical motor or drg of towing machine; Described modulate circuit, for the status signal that receives detection with send the change over signal corresponding with this status signal to data acquisition circuit; Described data acquisition circuit, for Collect conversion signal, and is sent to controller by collection signal; Described controller, for the treatment of the status information with showing towing machine;
Described acceleration pick-up is IEPE acceleration pick-up; Described modulate circuit is described IEPE acceleration pick-up power supply;
Described change over signal is voltage signal; Described modulate circuit converts detection signal to voltage signal, after signal amplification and filtering, exports data acquisition circuit to;
Described controller is compared the contrast signal of pre-stored in the collection signal of reception and described controller, judges that detected towing machine vibrational state is for normal or abnormal;
Described controller carries out the analysis of nargin, kurtosis, peak index, pulse index, peak value, mean effective value;
Controller carries out time domain or frequency-domain analysis to collection signal, and with described controller in the contrast signal of pre-stored compare, generate diagnosis report and show, this analysis is monolateral Fourier transform; This controller can directly be selected PC computer;
Diagnosis report has three kinds of generation approach: the first, directly by controller, collection signal is carried out to time domain or frequency-domain analysis, and with described controller in the contrast signal of pre-stored compare, generate diagnosis report; The second, directly carries out power spectrum, power density spectrum, wavelet transformation, cepstrum or Envelope Analysis by controller to collection signal, and with described controller in the contrast signal of pre-stored compare, generate diagnosis report; The third, first carry out time domain or frequency-domain analysis by controller to collection signal, and with described controller in the contrast signal of pre-stored compare, generate one time diagnosis report; After by controller, collection signal is carried out to power spectrum, power density spectrum, wavelet transformation, cepstrum or Envelope Analysis, and with described controller in the contrast signal of pre-stored compare, generate secondary diagnosis report; Above three kinds of modes that generate diagnosis report can be by the free choice for use of user.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010298357.4A CN101941623B (en) | 2010-09-30 | 2010-09-30 | Traction machine detection or diagnosis system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010298357.4A CN101941623B (en) | 2010-09-30 | 2010-09-30 | Traction machine detection or diagnosis system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101941623A CN101941623A (en) | 2011-01-12 |
| CN101941623B true CN101941623B (en) | 2014-04-16 |
Family
ID=43433870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010298357.4A Active CN101941623B (en) | 2010-09-30 | 2010-09-30 | Traction machine detection or diagnosis system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101941623B (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103626003A (en) * | 2012-08-27 | 2014-03-12 | 深圳市一兆科技发展有限公司 | Elevator fault detecting method and system |
| CN102923540A (en) * | 2012-10-30 | 2013-02-13 | 吴江信谊精密五金有限公司 | Detector for elevator dragger |
| CN103197651B (en) * | 2013-04-11 | 2016-03-30 | 中国特种设备检测研究院 | A kind of triplex redundance redundant computation machine observe and control system of elevator test |
| CN103663029A (en) * | 2013-12-27 | 2014-03-26 | 南京理工大学 | Elevator remote monitoring and debugging system |
| CN104860171B (en) * | 2015-05-18 | 2017-05-24 | 沈阳蓝光驱动技术有限公司 | Permanent magnet synchronous traction machine convenient to assemble and maintain |
| CN105293238B (en) * | 2015-11-04 | 2017-08-25 | 浙江大学 | A kind of elevator health status detection method |
| JP2017088314A (en) * | 2015-11-10 | 2017-05-25 | 株式会社日立ビルシステム | Equipment diagnostic apparatus, equipment diagnostic method, and equipment diagnostic system |
| US11347212B2 (en) | 2016-03-09 | 2022-05-31 | Siemens Aktiengesellschaft | Smart embedded control system for a field device of an automation system |
| CN106219342B (en) * | 2016-08-19 | 2019-02-01 | 广州广日电梯工业有限公司 | Elevator self diagnosis and pre- diagnostic system and method based on time-frequency convert algorithm |
| CN106792492A (en) * | 2017-03-07 | 2017-05-31 | 苏州大学 | A kind of monitoring system based on radio detection traction machine state |
| CN107381303A (en) * | 2017-07-04 | 2017-11-24 | 通力股份公司 | elevator drive |
| CN107473036A (en) * | 2017-07-31 | 2017-12-15 | 浙江省特种设备检验研究院 | Elevator traction machine remote online detects and diagnostic system and its checkout and diagnosis method |
| CN108562806B (en) * | 2018-01-05 | 2021-02-26 | 日立楼宇技术（广州）有限公司 | Method, device, equipment and storage medium for overall detection of performance of elevator traction machine |
| CN108439111A (en) * | 2018-02-28 | 2018-08-24 | 武汉大学 | A kind of elevator motion exception real-time detection method based on wavelet transformation |
| CN108529373B (en) * | 2018-04-02 | 2020-08-11 | 四川大学 | Elevator safety device based on laser temperature measurement and temperature processing method |
| CN109813422A (en) * | 2018-07-30 | 2019-05-28 | 杭州哲达科技股份有限公司 | One kind being used for running device Ankang method of real-time |
| CN109031121A (en) * | 2018-09-06 | 2018-12-18 | 安徽安凯汽车股份有限公司 | A kind of new energy vehicle driving motor in-circuit diagnostic system |
| CN109704163B (en) * | 2019-01-18 | 2020-05-12 | 西人马帝言(北京)科技有限公司 | Elevator running state monitoring method and device |
| CN111441783B (en) * | 2020-04-17 | 2021-06-15 | 中铁隧道局集团有限公司 | Centralized detection method for performance of low-voltage apparatus of shield machine |
| CN111537061B (en) * | 2020-05-21 | 2022-02-18 | 江苏理工学院 | Elevator traction motor vibration on-line detection system |
| CN111675063A (en) * | 2020-07-07 | 2020-09-18 | 广东卓梅尼技术股份有限公司 | Elevator traction machine fault determination method and system based on current monitoring technology |
| CN112520536B (en) * | 2020-11-30 | 2021-09-21 | 中国矿业大学 | Low-temperature vibration testing device and method for steel wire rope of winding type elevator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1769155A (en) * | 2004-11-02 | 2006-05-10 | 陕西亿丰电子工程有限公司 | Data collecting device for elevator safety operation estimating and monitoring system |
| CN201406235Y (en) * | 2009-03-27 | 2010-02-17 | 北京市朝阳区特种设备检测所 | Dynamic intelligent monitoring device for elevator |
| CN201842575U (en) * | 2010-09-30 | 2011-05-25 | 深圳技师学院 | Tractor detection or diagnosis system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005289532A (en) * | 2004-03-31 | 2005-10-20 | Mitsubishi Electric Corp | Elevator control device |
-
2010
- 2010-09-30 CN CN201010298357.4A patent/CN101941623B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1769155A (en) * | 2004-11-02 | 2006-05-10 | 陕西亿丰电子工程有限公司 | Data collecting device for elevator safety operation estimating and monitoring system |
| CN201406235Y (en) * | 2009-03-27 | 2010-02-17 | 北京市朝阳区特种设备检测所 | Dynamic intelligent monitoring device for elevator |
| CN201842575U (en) * | 2010-09-30 | 2011-05-25 | 深圳技师学院 | Tractor detection or diagnosis system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101941623A (en) | 2011-01-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101941623B (en) | Traction machine detection or diagnosis system | |
| CN102707232B (en) | Motor apparatus state on_line monitoring device and monitoring method thereof | |
| CN101101319A (en) | Generator rotor interturn short-circuit state detection device | |
| CN105035899A (en) | Elevator debugging method based on intelligent mobile phone | |
| KR101155770B1 (en) | A device and a method for condition diagnosis on engine of diesel generator for power plant | |
| CN104737029A (en) | System and method for monitoring an electrically-connected system having a periodic behavior | |
| CN202974666U (en) | Virtual instrument detection device for automobile engine | |
| CN110686856A (en) | Vibration monitoring, early warning and safety protection system for wind tunnel test bed of helicopter 2 m-diameter rotor | |
| CN101819256A (en) | System for testing turn-to-turn short circuit of rotor winding of automobile turbine generator | |
| CN201842575U (en) | Tractor detection or diagnosis system | |
| US20070164140A1 (en) | Method and apparatus for determining wear and tear in machines | |
| CN103234746A (en) | Device and method for online diagnosing faults of wind turbine generator gear case | |
| CN115655737A (en) | Health data acquisition and state judgment system for chassis dynamometer equipment | |
| CN110837045B (en) | Method for diagnosing potential fault of pump system and detection system | |
| CN112904200A (en) | Signal acquisition device based on motor current diagnosis harmonic speed reducer ware trouble | |
| CN112284720B (en) | Acoustic test-based fault diagnosis method for central transmission bevel gear of aircraft engine | |
| CN107161827B (en) | Online calibrator for elevator speed limiter and detection method thereof | |
| CN105865789A (en) | Detection system for bearing fault of decomposer gear reducer | |
| CN203163988U (en) | Wind turbine generator gear case on-line fault diagnosis device | |
| CN218156504U (en) | Portable fault diagnosis instrument based on sound vibration signal | |
| CN101769785A (en) | Vibration state spot check method for water injection machines and detection device | |
| CN203011692U (en) | Portable fault diagnosing device for rolling bearing | |
| CN209606462U (en) | A kind of speed probe intelligent detection equipment applied to rail traffic | |
| CN206095635U (en) | Rolling bearing fault diagnosis system | |
| KR100683590B1 (en) | A system of VVVF inverter and aid-converter diagnose in High-speed railway |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |