CN203534743U - Optical fiber sensing locking rod stress detection device - Google Patents
Optical fiber sensing locking rod stress detection device Download PDFInfo
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- CN203534743U CN203534743U CN201320326529.3U CN201320326529U CN203534743U CN 203534743 U CN203534743 U CN 203534743U CN 201320326529 U CN201320326529 U CN 201320326529U CN 203534743 U CN203534743 U CN 203534743U
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Abstract
Provided is an optical fiber sensing locking rod stress detection device. The optical fiber sensing locking rod stress detection device comprises a switching machine locking rod, a protection box, two pairs of strain sensitization-enhancing clamping devices, a fiber grating strain gauge and a fiber grating temperature compensating gauge, wherein the two pairs of clamping devices comprise two semicircular extension arm upper clamping blocks, two semicircular lower clamping blocks and fixing bolts, the two pairs of clamping devices are fastened on the switching machine locking rod, the fiber grating strain gauge is fastened between the two extension arms of the two pairs of the clamping devices, the fiber grating temperature compensating gauge is arranged beside the fiber grating strain gauge without any forces, the fiber grating strain gauge and the fiber grating temperature compensating gauge are connected in series to form a fiber optical path arranged in the protection box, fiber at one end of the fiber optical path is connected with the next locking rod stress detection device in series via transmission fiber, the other end is connected with a fiber continuous case via another transmission fiber, the fiber continuous case is then connected with a demodulator via an armored optical cable, and the demodulator, an industrial personal computer and an alarm device are connected in sequence in a telecommunication manner. The optical fiber sensing locking rod stress detection device detects data of conversion force and locking force etc. of a switching machine of rail switches in a dynamic and online manner.
Description
Technical field
The utility model relates to a kind of Fibre Optical Sensor locking bar stress detection device.Belong to the safety monitoring technology field that fiber grating sensing technology is applied to transportation by railroad and urban track traffic.
Background technology
Track switch, as rail track change and the circuit separated conversion equipment of joining, is that railway, telecommunication and signaling branch technical indicator are the most numerous and diverse, to the highest key link of line condition requirement, is also the multiple point of all kinds of faults.Electric point machine is converted into translation by electric machine rotation through slowing down, and promotes or pull the position of locking bar change tongue, has also changed the guiding of track switch.When turnout work, when locking bar promotes tongue stock rail motion laterally, locking bar is stressed, when locking bar and outside stock rail are when closely connected, and the pressure that locking bar should keep Locked (being locking force); Otherwise when locking bar pulls tongue stock rail motion to the inside, locking bar is subject to pulling force, when in locking bar, this side stock rail is closely connected, the pulling force that locking bar should keep Locked.
In daily maintenance, generally rely on railway worker's operating experience to adjust the locking force of track switch, when locking force, adjust when excessive, can cause goat in overload, cause the consequence of dissectible pin nail or other stressed part breaking, jeopardize traffic safety; When the conversion power of goat is less than the conversion resistance force of track switch, particularly in sleet sky, often cause track switch conversion not put in place, can affect equally traffic safety and driving efficiency.So, in order to guarantee the particularly safe operation of high speed passenger dedicated railway and urban track traffic of railroad train, be badly in need of online, dynamically monitoring the conversion power of locking bar, the size and Orientation of locking force, slewing rate, switching time etc. can reflect the parameter of point machine health status.
In present stage, the locking bar status monitoring of track switch has following several method:
1. in " indication rod " indentation, there, contact electric signal sensor is installed, the signal detecting by sensor judges whether indication rod motion puts in place, and then judges that whether the motion state of goat is normal.But this mode complicated operation, has relatively high expectations to field personnel, and is unfavorable for remote monitoring.
2. whether adopt the position of video technique monitoring point machine indication rod to change, whether its motion puts in place.With CCD photoelectric sensor, catch indication rod position wheel rim image, through filtering and thinning processing, to obtain best image effect.But the weak point of this goat monitoring system based on image processing techniques is video camera, need the severe on-the-spot goat side of mounting condition, camera lens and video camera light source are subject to the pollution of dust and greasy dirt.It not only to clean environment degree require high; And also require high to the stability of track foundation; Aspect cost, this technology involves great expense; In addition, the quantity of information that video image comprises is larger.Although these factors make the method possible in theory, can run into many problems in actual applications.
3. adopt Portable force measuring instrument to replace the connecting pin of goat locking bar to measure stressed the pin that force cell is housed.The method reflection is directly perceived, can monitor switch resistance transition state, but not only need to be on-the-spot to track switch when current without car while measuring at every turn, by contact dispatcher straighforward operation, pull goat, and the connecting pin of goat locking bar need to be taken out and changes, these operation complexities are high, and the repeated removal of crucial stressed part can make the security of railway switch have hidden danger, and the method is not online dynamic monitoring.
4. adopt the stressing conditions of the electric parameter monitoring locking bar that detects goat motor.For the goat of direct current generator, only need monitoring armature supply just can measure the electromagnetic torque of direct current generator, draw the size of goat power output.Goat to alternating current generator, because three phase electric machine is a multi-input multi-output system, can not directly by the size of electric current, obtain electromagnetic torque, can only indirect utilization three phase electric machine output power and power output between relation, to measure power, solve the power output of goat.The method is indirect measurement, is subject to the factor of ectocine many, as the fluctuation of power supply grid, and extraneous electromagnetic interference (EMI) etc.
At present, China's track transport circuit has been equipped more than 100,000 electric point machine, along with China railways constantly raises speed, and towards at a high speed, the future development of heavy duty, these present situations have further strengthened to employ new technology carries out reliable monitoring requirements to the working condition of goat.
Fiber Bragg grating strain sensor has high precision and high sensitivity, is not subject to electromagnetic interference (EMI), on-the-spot without electric signal, little, lightweight, the resistance to variation of ambient temperature of size, long transmission distance, the outstanding advantages such as corrosion-resistant, cost is low.So the utility model is intended utilizing fiber grating strain detection technique to detect dynamically, online the conversion power of goat locking bar, the size and Orientation of locking force, slewing rate, switching time etc. data, reach accurate judgement due to the movable retardance of tongue, the object of the stressed fault such as not normal of locking bar.
Utility model content
The utility model object aims to provide a kind of Fibre Optical Sensor locking bar stress detection device, for the dynamic and continuous monitoring of fiber grating of railway switch machine locking bar stress, and has the detection effect of stress enhanced sensitivity.
The technical solution of the utility model is: a kind of Fibre Optical Sensor locking bar stress detection device, and this device comprises the clamping device of goat locking bar, protection box, two pairs of strain sensitizations, FBG strain gauge, screw, optical fiber grating temperature compensation sheet, fibre junction case, detuner, data processing terminal, monitoring client and a warning device, wherein, the clamping device of two pairs of strain sensitizations comprises fixture block in two semi-circular lengthenings (arm lengthening), two semi-circular lower fixture blocks and fixture block set bolt, and the clamping device of two pairs of strain sensitizations adds steel construction glue by four fixture block set bolts and is fastened on goat locking bar, FBG strain gauge is added between two extension arms of clamping device that steel construction glue is fastened on two pairs of strain sensitizations by screw, optical fiber grating temperature compensation sheet does not stress and is placed on side, FBG strain gauge and the series connection of optical fiber grating temperature compensation sheet form optic fibre light path, be placed in protection box, the optical fiber of optic fibre light path one end is drawn protection box by Transmission Fibers and is connected with next locking bar stress detection device via fibre junction case, the other end of light path is received and in fibre junction case, is connect armored optical cable and be connected to detuner by another root Transmission Fibers, described detuner, industrial computer (data processing terminal), monitoring client and warning device sequentially telecom-connect.
In the utility model device, by the wavelength interval of " wavelength-division multiplex ", select the optic fiber grating wavelength of FBG strain gauge and the optic fiber grating wavelength of optical fiber grating temperature compensation sheet, and serial connection is a light path.
In the utility model device, Transmission Fibers and armored optical cable adopt single-mode fiber, and armored optical cable is multicore armored optical cable.
In the utility model device, detuner adopts Wuhan science and engineering Guang Ke incorporated company product, and model is BGD-4M.
In the utility model device, the client of monitoring client and warning device by all Monitoring Data the network remote-transmission by Ethernet and mobile phone operators to track switch supervision department.
In the utility model device, protection box material is stainless steel.FBG strain gauge is the prefabricated stainless steel foil gauge of Fiber Bragg Grating.
In the utility model device, warning device adopts loudspeaker and traffic light.
The utility model adopts mechanical fasteners formula mode that two pairs of semi-circular lengthening fixture blocks are added to steel construction glue with bolt and is fastened on goat locking bar, and a prefabricated stainless steel foil gauge that is adhesive with Fiber Bragg Grating is added between the extension arm that steel construction glue is fastened on two pairs of semi-circular fixture blocks with screw.Another is prefabricated, and the FBG strain gauge of different wave length does not stress and is placed on side, plays temperature compensation.On optic fibre light path, connect these two foil gauges also with protecting box to be protected.Transmission Fibers is drawn to protection box connects with the FBG monitoring device of next switch locking stress in the bar.
Stressed FBG strain gauge (stainless steel foil gauge) is experienced the dynamic load of locking bar, by Transmission Fibers, the wavelength variations signal of each goat locking bar sensor is connected after fibre junction case gathers, by multicore armored optical cable, output to detuner, after opto-electronic conversion and Wavelength demodulation, obtain and the stressed relevant wavelength signals of locking bar; Be sent to again data processing terminal (industrial computer) and carry out data processing and demonstration, realize dynamic on-line monitoring.Data processing terminal is converted to stress by surveyed strain, and by the historical variations trend of comparative analysis data characteristic, to the conversion power of goat locking bar, the size and Orientation of locking force, the health status such as slewing rate, switching time are assessed, while surpassing alarm threshold value, start warning device; And upload in real time result to supervision department.
In this Fibre Optical Sensor locking bar stress detection device, utilize fiber grating by the stressed optic fiber grating wavelength signal that is converted into.Strain sensing device is mainly made by fixture block, semi-circular lower fixture block, the encapsulation of protection box in FBG strain gauge, semi-circular lengthening, and wherein optical fiber grating sensing material cured is on foil gauge.When locking bar is stressed, produced distortion, while passing to foil gauge by the semi-circular fixture block rigid arm of extension arm, because locking bar is fixed the spacing of two fixture blocks much larger than the length of fiber grating self, the deflection producing between fixture block is applied on the grating of little length completely, make on grating, to have produced the strain of directly pasting large several times on locking bar than grating, thereby obtain the effect of enhanced sensitivity.
In the utility model scheme, adopt double optical fiber grating foil gauge difference sensing technology to carry out the temperature compensation of strain.A FBG strain gauge is fixed between two semi-circular lengthening fixture blocks, the FBG strain gauge of another different wave length is as the optical fiber grating temperature compensation foil gauge not stressing, because the contour structures of two FBG strain gauges is identical, thermal expansivity is identical, the position being in is identical, the fiber bragg grating center wavelength side-play amount that these two foil gauges produce due to variation of ambient temperature, the way of subtracting each other by wavelength is offset, remaining wavelength variable quantity has just been reacted the variation of the strain of surveying, thus the interference of having rejected environment temperature.
In the utility model scheme, Transmission Fibers adopts single-mode fiber.Fibre junction case by input sequence the fiber-optic grating sensor of all detector bars to be measured with temperature compensation sheet sorts by wavelength and " wavelength-division multiplex " mode of pressing is connected in series.
In the utility model scheme, detuner adopts Wuhan science and engineering Guang Ke incorporated company product, and model is BGD-4M.Adopted Fabry-Perrault cavity fiber bragg grating wave length filtering demodulation techniques, the wavelength signals of fiber Bragg grating strain sensor has been exported after opto-electronic conversion and Wavelength demodulation.Because fiber grating demodulation Qi mono-road optical channel can more than 10 locking bar of demodulation optical fiber optical grating stress monitoring device, for multi-channel demodulator instrument, its demodulation ability can meet the monitoring requirements of the whole track switches in field, large-scale station, and cost is reduced greatly.
In the utility model scheme, data processing terminal adopts industrial computer, its data handling system energy Real-time Collection, demonstration, and building database longer-term storage measurement data; The strain data that FBG strain gauge is detected is converted into the size of goat locking bar stress, and its stressed direction of acquisition process, the signals such as time that perform an action, its expert system can recognize that monitored data characteristic changes and trend, whether draw the conclusion that traffic safety is threatened, under abnormal conditions, start warning device.
In the utility model scheme, monitoring client is crossed mobile phone operators network with ether Netcom provides monitoring terminal user interface for long-range track switch supervision department.Warning device adopts loudspeaker and traffic light, and occurs alarm at software interface.
The utility model device in monitoring point has all been done reinforcing and preservative treatment, do not damaging rail and point machine, do not change mechanical fasteners in roadbed situation and install, can the on-the-spot long term monitoring of stablizing of track switch heavily loaded under the severe environmental conditions such as humidity, greasy dirt, sunshine, vibration, coal dust, electromagnetic interference (EMI), that bullet train frequently passes through.
The know-why that the utility model adopts is: the strain transducer that adopts " optical fiber Bragg (Bragg) grating " (being called for short FBG) making.Fiber Bragg Grating is to adopt uv excimer laser bundle to irradiate the side of the single-mode fiber that common communications uses, laser beam makes the lattice generation permanent change of optical fiber earth silicon material by the method for mask plate or interference, form micron-sized grating grid, the overall length of grid is several millimeters.Become after grid, the fiber core refractive index of this section of optical fiber presents periodic distribution striped and produces Bragg grating effect at length direction.Its basic optical characteristic is exactly a narrow band optical filter centered by resonant wavelength.When wideband light source is sent light beam to bragg grating by optical fiber coupler, in the situation that meeting bragg condition, will there is total reflection, at Bragg wavelength place, there is peak value in its reflectance spectrum.Grating is subject to the used time of doing of external physical field (as strain, temperature etc.), and pitch changes thereupon, thereby has changed retroreflection light wavelength, according to the size of its skew, just can determine the variation of detected part physical quantity.
The utility model device is applicable to the long-term online and dynamic monitoring of the point machine locking bar stress of transportation by railroad and urban track traffic under mal-condition, by being arranged on the conversion power of the fiber Bragg grating strain sensor monitoring locking bar at place, monitoring point, the size and Orientation of locking force, slewing rate, the data such as the time performing an action switching time etc., grasp it in high speed, health characteristic under heavy duty dynamic load and rugged surroundings long term, judged whether degradating trend, realize the remote dynamically on-line monitoring of unmanned, to improve management level and the intelligent degree of railway urban track traffic, for safe operation provides reliable guarantee.
Advantage of the present utility model: compare with existing detection technique, this monitoring device has that long-time stability are good, antijamming capability is strong, reliability is high, multiple spot detects, it is accurate, corrosion-resistant to measure, not affected by variation of ambient temperature, many advantages such as driving are not disturbed in the installation of monitoring device, and there is the ability of the on-the-spot dozens of detector bar of demodulation monitoring point wavelength signals, can be under mal-condition long-time on-line monitoring.
Accompanying drawing explanation
Fig. 1 is a kind of Fibre Optical Sensor locking bar stress detection device schematic diagram;
Fig. 2 is the principle schematic that a kind of Fibre Optical Sensor locking bar stress detects enhanced sensitivity;
In figure: 1-goat locking bar, 2-protects box, fixture block in the semi-circular lengthening of 3-; 4-fixture block set bolt, the semi-circular lower fixture block of 5-, 6-FBG strain gauge; 7-screw, 8-optical fiber grating temperature compensation sheet, 9-Transmission Fibers; 10-fibre junction case, 11-armored optical cable, 12-detuner; 13-data processing terminal, 14-monitoring client and warning device, the rigid arm that 17-lengthens; a is the length of strain measurement fiber grating, the length of the actual participation strain measurement that A is locking bar.
When the distortion of the stressed generation of locking bar by two when the semi-circular fixture block for A lengthens rigid arm and passes to foil gauge, because the distance of A is greater than the length a of fiber grating self, the moderate finite deformation producing between fixture block is applied on the grating of little length completely, make grating produce the strain of directly pasting large several times on locking bar than grating, and obtain the effect of enhanced sensitivity.
Embodiment
As shown in Figure 1, this Fibre Optical Sensor locking bar stress detection device utilizes FBG strain gauge to monitor the dynamic load of locking bar.
Single locking bar stress detection device comprises: goat locking bar 1(is for detecting target); A stainless steel protection box 2; The clamping device of two pairs of strain sensitizations (comprises 3, four fixture block set bolts of fixture block in two semi-circular lengthenings (arm lengthening) 4, two semi-circular lower fixture blocks 5; A FBG strain gauge 6; Four screws 7; An optical fiber grating temperature compensation sheet 8.
Whole monitoring system also has: some Transmission Fibers 9; Several fibre junction casees 10; A multicore armored optical cable 11; A detuner 12; A data processing terminal 13; Monitor client and warning device 14 for one.
Specific practice:
1. single locking bar stress detection device is first clamped the appropriate location of goat locking bar 1 to be measured by fixture block 3 in a semi-circular lengthening and semi-circular lower fixture block 5, faying face applies ageing-resistant steel construction glue, use fixture block set bolt 4 mechanical fasteners, formed clamping device on one side; The extension arm of the extension arm of second pair of clamping device and first pair of clamping device is staggered relatively, reserve the suitable distance of installing optical fibres grating strain sheet 6, using the same method, it is fastening with fixture block set bolt 4 to add after steel construction glue.
2. by four screws 7 of FBG strain gauge 6 use and apply ageing-resistant steel construction glue and be arranged on the installation site of fixture block 3 in semi-circular lengthening; Protection box 2 is installed; The critical part of sensing device and protection box, cover cap is all made by stainless steel, is not damaging goat, does not change mechanical fasteners in locking bar and roadbed situation and installs.
3. the optical fiber grating temperature compensation sheet 8 of different wave length is put into 2 li, protection box, by the wavelength interval of " wavelength-division multiplex ", selected the optic fiber grating wavelength of FBG strain gauge and the optic fiber grating wavelength of optical fiber grating temperature compensation sheet, and serial connection is a light path; Protection box 2 will be drawn after light path two termination Transmission Fibers 9; One end is connected with the light path of next locking bar sensor to be measured; Other end access detuner 12, this Transmission Fibers 9 adopts single-mode fiber, by age inhibiting insulation tube, be connected to the fibre junction case 10 closing on and be connected with multicore armored optical cable 11, armored optical cable is laid in cable duct, is transferred to the detuner 12 in the monitoring room of pulpit after gathering.
4. detuner 12 adopts Wuhan science and engineering Guang Ke incorporated company product, is BGD-4M type, by the wavelength signals demodulation of input out; Data processing terminal 13 adopts industrial computer, its data handling system is converted to stress by surveyed strain, and gather, store and show the conversion power of locking bar, the size and Orientation of locking force, the data such as slewing rate, switching time, and as acquisition server, Web server and database.The data characteristic that the identification of its expert system monitors changes and trend, and whether draws the conclusion of fault;
5. the network that the client part of monitoring client and warning device 14 is crossed mobile phone operators with ether Netcom, for track switch supervision department provides monitoring terminal user interface, facilitates supervision department to Monitoring Data inquiry and historical data contrast; The warning device of monitoring client and warning device 14 partly adopts loudspeaker and traffic light, and occurs alarm at software interface.
Claims (7)
1. a Fibre Optical Sensor locking bar stress detection device, is characterized in that: this device comprises clamping device, a FBG strain gauge (6), screw (7), an optical fiber grating temperature compensation sheet (8), fibre junction case (10), detuner (12), data processing terminal (13), monitoring client and the warning device (14) of goat locking bar (1), protection box (2), two pairs of strain sensitizations, wherein, the clamping device of two pairs of strain sensitizations comprises fixture block (3) in two semi-circular lengthenings, two semi-circular lower fixture blocks (5) and fixture block set bolt (4), and the clamping device of two pairs of strain sensitizations adds steel construction glue by four fixture block set bolts (4) and is fastened on goat locking bar (1), FBG strain gauge (6) is added between two extension arms of clamping device that steel construction glue is fastened on two pairs of strain sensitizations by screw (7), optical fiber grating temperature compensation sheet (8) does not stress and is placed on side, FBG strain gauge (6) and optical fiber grating temperature compensation sheet (8) series connection form optic fibre light path, be placed in protection box (2), the Transmission Fibers for optical fiber (9) of optic fibre light path one end is drawn protection box (2) and is connected with next locking bar stress detection device (15) via fibre junction case (10), the other end of light path is received the inner armored optical cable (11) that connects of fibre junction case (10) by another root Transmission Fibers (9) and is connected to detuner (12), detuner (12), data processing terminal (13), monitoring client and warning device (14) sequentially telecom-connect.
2. a kind of Fibre Optical Sensor locking bar stress detection device according to claim 1, it is characterized in that: by the wavelength interval of " wavelength-division multiplex ", select the optic fiber grating wavelength of FBG strain gauge (6) and the optic fiber grating wavelength of optical fiber grating temperature compensation sheet (8), and serial connection is a light path.
3. a kind of Fibre Optical Sensor locking bar stress detection device according to claim 1, is characterized in that: Transmission Fibers (9) and armored optical cable (11) adopt single-mode fiber, and armored optical cable is multicore armored optical cable.
4. a kind of Fibre Optical Sensor locking bar stress detection device according to claim 1, is characterized in that: data processing terminal (13) adopts industrial computer.
5. a kind of Fibre Optical Sensor locking bar stress detection device according to claim 1, is characterized in that: the client of monitoring client and warning device (14) by all Monitoring Data the network remote-transmission by Ethernet and mobile phone operators to track switch supervision department.
6. a kind of Fibre Optical Sensor locking bar stress detection device according to claim 1, is characterized in that: protection box (2) material is stainless steel.
7. a kind of Fibre Optical Sensor locking bar stress detection device according to claim 1, is characterized in that: warning device adopts loudspeaker and traffic light.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320326529.3U CN203534743U (en) | 2013-06-07 | 2013-06-07 | Optical fiber sensing locking rod stress detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320326529.3U CN203534743U (en) | 2013-06-07 | 2013-06-07 | Optical fiber sensing locking rod stress detection device |
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| CN203534743U true CN203534743U (en) | 2014-04-09 |
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| CN201320326529.3U Expired - Fee Related CN203534743U (en) | 2013-06-07 | 2013-06-07 | Optical fiber sensing locking rod stress detection device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764451A (en) * | 2017-10-13 | 2018-03-06 | 杭州慧景科技股份有限公司 | Point machine squeezes trouble power on-Line Monitor Device and monitoring method |
| CN108760603A (en) * | 2018-07-10 | 2018-11-06 | 湖北文索光电科技有限公司 | Series distributed optical fiber geological stability safety monitoring sensor and system |
| CN109374067A (en) * | 2018-12-11 | 2019-02-22 | 武汉理工大学 | Many reference amounts Fibre Optical Sensor highway plate-girder real-time monitoring system and monitoring method |
| CN110011730A (en) * | 2019-05-06 | 2019-07-12 | 国网山西省电力公司临汾供电公司 | ADSS optical survey system based on laser grating screw |
| CN113251970A (en) * | 2021-04-30 | 2021-08-13 | 西安铁路信号有限责任公司 | On-line detection method for abrasion loss of switch machine locking surface |
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2013
- 2013-06-07 CN CN201320326529.3U patent/CN203534743U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764451A (en) * | 2017-10-13 | 2018-03-06 | 杭州慧景科技股份有限公司 | Point machine squeezes trouble power on-Line Monitor Device and monitoring method |
| CN108760603A (en) * | 2018-07-10 | 2018-11-06 | 湖北文索光电科技有限公司 | Series distributed optical fiber geological stability safety monitoring sensor and system |
| CN109374067A (en) * | 2018-12-11 | 2019-02-22 | 武汉理工大学 | Many reference amounts Fibre Optical Sensor highway plate-girder real-time monitoring system and monitoring method |
| CN110011730A (en) * | 2019-05-06 | 2019-07-12 | 国网山西省电力公司临汾供电公司 | ADSS optical survey system based on laser grating screw |
| CN110011730B (en) * | 2019-05-06 | 2024-02-06 | 国网山西省电力公司临汾供电公司 | ADSS optical cable monitoring system based on laser grating screw |
| CN113251970A (en) * | 2021-04-30 | 2021-08-13 | 西安铁路信号有限责任公司 | On-line detection method for abrasion loss of switch machine locking surface |
| CN113251970B (en) * | 2021-04-30 | 2023-09-12 | 西安铁路信号有限责任公司 | Online detection method for wear amount of locking surface of switch machine |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 Termination date: 20200607 |