CN115574724A - Railway turnout movable steel rail displacement monitoring device, monitoring method and evaluation method - Google Patents
Railway turnout movable steel rail displacement monitoring device, monitoring method and evaluation method Download PDFInfo
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- CN115574724A CN115574724A CN202211439114.7A CN202211439114A CN115574724A CN 115574724 A CN115574724 A CN 115574724A CN 202211439114 A CN202211439114 A CN 202211439114A CN 115574724 A CN115574724 A CN 115574724A
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 116
- 238000012806 monitoring device Methods 0.000 title claims abstract description 48
- 238000012544 monitoring process Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 8
- 239000010959 steel Substances 0.000 title claims abstract description 8
- 238000011156 evaluation Methods 0.000 title abstract description 7
- 239000000835 fiber Substances 0.000 claims abstract description 29
- 239000013307 optical fiber Substances 0.000 claims abstract description 18
- 238000012423 maintenance Methods 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 150000001875 compounds Chemical class 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000009413 insulation Methods 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 3
- 230000006855 networking Effects 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61K—AUXILIARY EQUIPMENT SPECIALLY ADAPTED FOR RAILWAYS, NOT OTHERWISE PROVIDED FOR
- B61K9/00—Railway vehicle profile gauges; Detecting or indicating overheating of components; Apparatus on locomotives or cars to indicate bad track sections; General design of track recording vehicles
- B61K9/08—Measuring installations for surveying permanent way
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B35/00—Applications of measuring apparatus or devices for track-building purposes
- E01B35/12—Applications of measuring apparatus or devices for track-building purposes for measuring movement of the track or of the components thereof under rolling loads, e.g. depression of sleepers, increase of gauge
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- Machines For Laying And Maintaining Railways (AREA)
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Abstract
The invention discloses a railway turnout movable steel rail displacement monitoring device, a monitoring method and an evaluation method, wherein the railway turnout movable steel rail displacement monitoring device comprises a displacement sensing device, a displacement monitoring device and a fiber bragg grating demodulating device; the displacement sensing device is mainly used for sensing tiny displacement of the track, the displacement monitoring device is mainly used for tracking and measuring displacement values in real time, and the fiber bragg grating demodulating device is mainly used for recording and feeding back displacement states. The invention has the advantages of anti-electromagnetic interference, long-distance transmission and the like, the multiplexing and networking capability of the optical fiber displacement sensing technology is stronger, and compared with the traditional electrical testing technology, the invention also has the characteristics of electric insulation, corrosion resistance, no drift and the like, and can meet the long-term monitoring requirement of the high-speed railway. The method has important practical significance for the safety monitoring and maintenance of the railway. The invention also constructs an evaluation method of the displacement of the movable switch rail/point rail of the high-speed turnout, and provides real-time data and on-site basis for normal operation and safe maintenance of the railway.
Description
Technical Field
The invention relates to the field of railway turnout measuring devices, in particular to a railway turnout movable steel rail displacement monitoring device, a monitoring method and an evaluation method.
Background
The safe and reliable conversion of the movable switch rail/point rail in the high-speed turnout area is a key link for ensuring the railway operation safety and is an important index of the normal operation load of the track. Whether the movable switch rail/point rail conversion is in place in the high-speed turnout area influences the wheel rail contact relation, and further influences the wheel rail interaction of a vehicle passing through the turnout and the safety and stability indexes of vehicle dynamics. If the switch rail/point rail can not meet the conversion requirement, and insufficient displacement such as conversion failure, blocking and the like exists, the driving safety can be seriously harmed, so that the real-time monitoring on the conversion displacement of the switch rail/point rail is of great significance.
At present, the monitoring means for judging whether the movable switch rail/point rail conversion in a turnout area is in place is not accurate enough, the detection mode is traditional, the deviation of the monitoring result is large, and the hidden danger of the safety maintenance of the railway still exists. The traditional electricity type displacement sensing monitoring system has strong electromagnetic interference, brings potential safety hazards to the high-speed railway operation environment, and urgently needs to develop a set of new high-precision displacement monitoring device so as to track the switch rail/point rail displacement in real time and provide a field basis for the safe operation of the railway.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device for monitoring the displacement of a movable rail of a railway turnout, a monitoring method and an evaluation method, wherein the device can accurately monitor the conversion displacement state of a movable switch rail/point rail in a turnout area, is beneficial to improving the safety monitoring and maintenance efficiency of the railway, reducing the rail moving risk and effectively improving the economic and social benefits of railway operation.
In order to achieve the purpose, the device and the technical scheme designed by the invention are as follows:
a movable rail displacement monitoring device for a railway turnout comprises a displacement sensing device, a displacement monitoring device and a fiber bragg grating demodulating device. The displacement sensing device is mainly used for sensing micro displacement of the track, the displacement monitoring device is mainly used for tracking and measuring displacement values in real time, and the fiber grating demodulating device is mainly used for recording and feeding back displacement states.
The displacement sensing device comprises a rigid rod, one end of the rigid rod can transversely move left and right along with the rotation of the movable switch rail/point rail, one end of the rigid rod is fixedly connected with the switch rail/point rail bottom clamp, and the other end of the rigid rod is connected with the spring. The spherical hinge is positioned in the middle of the rigid rod and plays a role of a lever fulcrum;
the displacement monitoring device comprises a spring piece base, a spring piece, a Fiber Bragg Grating (FBG), an optical fiber, a spring and a displacement monitoring device shell. The spring is connected with the rigid rod and the elastic sheet, the elastic sheet is arranged on the elastic sheet base, two fiber Bragg gratings with the same central wavelength are engraved on the same optical fiber, the two fiber Bragg gratings are respectively adhered to two sides of the elastic sheet, and one end of the optical fiber is connected with the fiber Bragg grating demodulating device.
The whole displacement monitoring device is arranged on a track bed plate between the switch sleepers, the rigid rod is fixedly connected with the switch rail/center rail bottom clamp, the spherical hinge is positioned in the middle of the rigid rod, the lever fulcrum is played, and meanwhile, the requirement of internal water resistance of the displacement monitoring device can be met. The point rail/point rail tip is in free telescopic state, and under the action of temperature force, the point rail/point rail has certain free telescopic displacement along the track direction. The spherical hinge can sense the displacement transmitted in all directions, so that the sensing device can meet the requirement of monitoring the transverse conversion displacement of the switch rail/point rail in a free telescopic state.
The optical fiber displacement sensing system takes light waves as a carrier and optical fibers as a medium, has the advantages of electromagnetic interference resistance, long-distance transmission and the like, has stronger multiplexing and networking capabilities, has the characteristics of electric insulation, corrosion resistance, no drift and the like compared with the traditional electric testing technology, and can meet the requirement of long-term switch rail/point rail conversion displacement monitoring of a high-speed railway.
Furthermore, the elastic sheet base is fixed at the bottom of the displacement monitoring device, the rigid rod is connected with the elastic sheet through a spring, and two Fiber Bragg Gratings (FBGs) connected to one optical fiber in series are respectively adhered to two sides of the elastic sheet.
The device is used for monitoring the displacement of the movable steel rail of the railway turnout, and the monitoring method comprises the following steps:
when the switch rail/point rail transversely rotates, the rigid rod is driven to transversely rotate, the rigid rod rotates by taking the spherical hinge as a lever fulcrum, and the elastic sheet is driven to deform by the spring. When the elastic sheet is deformed, one side of each of the Fiber Bragg Gratings (FBGs) positioned on the two sides of the elastic sheet is in tension strain, and the other side of each of the Fiber Bragg Gratings (FBGs) is in compression strain.
Center wavelength shift of fiber Bragg grating
And longitudinal strain
The relationship of (c) is:
in the formula (I), the compound is shown in the specification,
is the center wavelength of the fiber bragg grating,
is the elasto-optic coefficient of the fiber optic material;
the relation between the central wavelength of the Fiber Bragg Grating (FBG) and the switch rail/point rail rotational displacement can be calibrated by the formula (1), so that the on-line monitoring of the switch rail/point rail rotational displacement is realized.
The whole displacement monitoring device is arranged on a track bed plate between the switch sleepers, the rigid rod is fixedly connected with the switch rail/center rail bottom clamp, the rigid rod is coupled with the displacement monitoring device shell through the spherical hinge, the spherical hinge plays a role of a lever fulcrum, and meanwhile, the requirement of internal water resistance of the displacement monitoring device can be met. Meanwhile, the point rail/point rail tip is in a free telescopic state, and the point rail/point rail has certain free telescopic displacement along the track direction under the action of temperature force. The spherical hinge can sense the displacement transmitted in all directions, so that the sensing device can meet the requirement of monitoring the transverse conversion displacement of the switch rail/point rail in a free telescopic state.
The invention also aims to provide a method for evaluating the displacement of the movable rail of the railway turnout, which comprises the following steps:
step 1: the movable switch rail/point rail conversion displacement monitoring device of the high-speed turnout is arranged on a track bed plate between the appointed switch sleepers, and the corresponding relation between the switch rail/point rail conversion displacement and the output center wavelength offset is calibrated;
step 2: time-averaged division of the overall point/point transitionnPortions of each portion of time intervalΔtReading the corresponding displacement D of the movable point/point rail during the switching process at regular time intervals i And recording;
and step 3: capturing recorded displacement data, constructing a Di-T curve based on displacement-time, and seeking a displacement rule;
and 4, step 4: and according to the monitoring data, a technical scheme of railway safety maintenance is formulated to guarantee healthy operation.
In conclusion, the device for monitoring the displacement of the movable steel rail of the railway turnout, the monitoring method and the evaluation method provided by the invention have the following advantages and beneficial effects:
1. the optical fiber displacement sensing system takes light waves as a carrier and optical fibers as a medium, has the advantages of electromagnetic interference resistance, long-distance transmission and the like, has stronger multiplexing and networking capabilities of the optical fiber displacement sensing technology, has the characteristics of electric insulation, corrosion resistance, no drift and the like compared with the traditional electric testing technology, and can meet the long-term monitoring requirement of the high-speed railway.
2. The rigid rod is coupled with the displacement monitoring device shell through the spherical hinge, the spherical hinge plays a role of a lever fulcrum, and meanwhile, the requirement of water resistance inside the displacement monitoring device can be met.
3. The point rail/point rail tip is in free telescopic state, and under the action of temperature force, the point rail/point rail has certain free telescopic displacement along the track direction. The spherical hinge can sense the displacement transmitted in all directions, so that the sensing device can meet the requirement of monitoring the transverse conversion displacement of the switch rail/point rail in a free telescopic state.
4. The device has the advantages of simple structure, easy operation and low cost.
Drawings
FIG. 1 is a schematic logical framework of the apparatus of the present invention;
FIG. 2 is a three-dimensional schematic view of a displacement monitoring device of the apparatus of the present invention;
FIG. 3 is a schematic view of the installation position of the apparatus of the present invention;
FIG. 4 is a schematic view of a portion of the installation of the apparatus of the present invention;
FIG. 5a is a schematic diagram of the switch zone key components of a switch;
FIG. 5b is a schematic diagram of the key components of the frog region of the switch;
fig. 6 is a flow chart of monitoring and evaluating the displacement of the movable rail of the railway switch based on the device of the invention.
In the figure, 1-displacement sensing device, 2-displacement monitoring device, 3-fiber bragg grating demodulating device, 4-rigid rod, 5-spherical hinge, 6-elastic sheet base, 7-elastic sheet, 8-fiber bragg grating, 9-optical fiber, 10-spring and 11-displacement monitoring device shell.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings and specific examples, but the embodiments of the present invention are not limited thereto.
Example 1
According to the technical scheme, as shown in fig. 1, the movable rail displacement monitoring device for the railway turnout provided by the invention comprises a displacement sensing device 1, a displacement monitoring device 2 and a fiber bragg grating demodulating device 3.
The displacement sensing device 1 comprises a rigid rod 4 with one end capable of transversely moving left and right along with the rotation of the movable switch rail/point rail, one end of the rigid rod 4 is fixedly connected with the rail bottom fixing device, and the other end is connected with a spring 10. The spherical hinge 5 is positioned in the middle of the rigid rod and plays a role of a lever fulcrum;
as shown in fig. 2, the displacement monitoring device 2 includes a spring base 6, a spring 7, a fiber bragg grating 8, an optical fiber 9, a spring 10, and a displacement monitoring device housing 11. The spring 10 is connected with the rigid rod 4 and the elastic sheet 7, the elastic sheet 7 is arranged on the elastic sheet base 6, the two fiber Bragg gratings 8 with the same central wavelength are engraved on the same optical fiber 9, the two fiber Bragg gratings 8 are respectively adhered to two sides of the elastic sheet 7, and one end of the optical fiber 9 is connected with the fiber bragg grating demodulating device 3.
As shown in fig. 3 and 4, the whole displacement monitoring device 2 is installed on a track bed plate between switch sleepers, the rigid rod 4 is fixedly connected with a switch rail/point rail bottom clamp, the spherical hinge 5 is positioned in the middle of the rigid rod 4, the function of a lever fulcrum is achieved, and meanwhile the requirement of water resistance inside the displacement monitoring device 2 can be met. The point rail/point rail tip is in free telescopic state, and under the action of temperature force, the point rail/point rail has certain free telescopic displacement along the track direction. The spherical hinge 5 can sense the displacement transmitted in each direction, so that the sensing device can meet the requirement of monitoring the transverse conversion displacement in the free telescopic state of the switch rail/point rail.
As shown in fig. 6, the method for evaluating the movable rail displacement monitoring device of the railway switch comprises the following steps:
step 1: as in the turnout zone shown in fig. 5a or fig. 5b, the displacement monitoring device is installed on a track bed plate between specified turnout sleepers, and the corresponding relation between switch rail/point rail conversion displacement and output center wavelength offset is calibrated;
step 2: time-averaged division of the overall point/point transitionnPortions per portion timeAt an interval ofΔtReading the corresponding displacement D of the movable point/point rail during the switching process at regular time intervals i And recorded, as in table 1;
TABLE 1 displacement values during point/point transition
And step 3: capturing recorded displacement data and constructing D based on displacement-time i -T-curve, seeking displacement law;
and 4, step 4: and according to the monitoring data, a technical scheme of railway safety maintenance is formulated to guarantee healthy operation.
Example 2
In this embodiment, on the basis of embodiment 1, a plurality of displacement monitoring devices are disposed in switch tie sections corresponding to different head widths of the switch point rail/point rail, and are used for tracking displacement values of the movable point rail/point rail at different cross sections during a long-time driving process, and examining whether the movable point rail/point rail has a monitoring point location effect.
Other operation procedures and specific technical schemes are the same as those in the embodiment 1.
Example 3
In this embodiment, on the basis of the embodiments 1 and 2, the developed monitoring device is upgraded for the second time, the rigid rod 4 in the device is connected with the spring 10 along the line direction (longitudinal direction) at the same time, and another set of elastic sheet, optical fiber and bragg grating is arranged in the displacement monitoring device 2 at the same time, so that the device can simultaneously realize the on-line monitoring of the free telescopic displacement of the switch rail/point rail along the line longitudinal direction and the transverse conversion displacement of the switch rail/point rail.
Other operation procedures and specific technical schemes are the same as those in the embodiment 1 and the embodiment 2.
Example 4
In this embodiment, on the basis of the embodiment 1 and the embodiment 2, the developed monitoring device is upgraded again, and the contact device integrating data storage and transmission is installed in the device, so that the staff can collect the trace data indoors in real time and complete data arrangement and analysis.
Other operation flows and specific technical schemes are the same as those in the embodiment 1 and the embodiment 2.
The detailed description of the embodiments of the present invention is provided above with reference to the accompanying drawings, it should be understood that the above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment. Various modifications and changes, which will be apparent to those skilled in the art, without departing from the spirit and scope of the invention, are intended to be included within the scope of the invention.
Claims (5)
1. A movable rail displacement monitoring device for railway turnout comprises a displacement sensing device (1), a displacement monitoring device (2) and a fiber bragg grating demodulating device (3);
the displacement monitoring device (2) is arranged on a track bed plate between the switch sleepers, the displacement monitoring device (2) comprises a displacement monitoring device shell (11), and the elastic sheet (7) is arranged in the displacement monitoring device shell (11) through an elastic sheet base (6); the top of the elastic sheet (7) is provided with a spring (10);
the fiber Bragg grating (8) is engraved on the optical fiber (9), the fiber Bragg grating (8) is respectively adhered on the elastic sheets (7), and one end of the optical fiber (9) is connected with the fiber Bragg grating demodulating device (3); the fiber grating demodulation device (3) records and feeds back the displacement state;
the displacement sensing device (1) comprises a rigid rod (4), the middle part of the rigid rod (4) is hinged on a displacement monitoring device shell (11), one end of the rigid rod (4) is fixedly connected with a switch rail/point rail bottom clamp and moves transversely left and right along with the rotation of the movable switch rail/point rail, and the other end of the rigid rod (4) is positioned in the displacement monitoring device shell (11) and is connected with a spring (10).
2. The railway turnout movable steel rail displacement monitoring device according to claim 1, wherein two fiber bragg gratings (8) are provided, and the two fiber bragg gratings (8) have the same central wavelength and are respectively adhered to two sides of the elastic sheet (7).
3. A device for monitoring the displacement of a movable rail of a railway switch according to claim 1, characterized in that the rigid bar (4) is hinged in the middle on the housing (11) of the device for monitoring the displacement by means of a spherical hinge (5).
4. A method for monitoring the displacement of a movable rail of a railway switch, which is characterized in that the device for monitoring the displacement of the movable rail of the railway switch according to any one of claims 1 to 3 is adopted, and comprises the following steps:
when the switch rail/point rail transversely rotates, one end of the rigid rod (4) is driven to transversely rotate, the rigid rod (4) rotates by taking a hinged part with the displacement monitoring device shell (11) as a fulcrum, and the other end of the rigid rod (4) drives the elastic sheet (7) to deform through the spring (10); when the elastic sheet (7) deforms, one side of the fiber Bragg grating (8) positioned on the two sides of the elastic sheet (7) is strained in a tensile mode, and the other side of the fiber Bragg grating is strained in a compression mode;
central wavelength shift of a fiber Bragg grating (8)
And longitudinal strain
The relationship of (1) is:
in the formula (I), the compound is shown in the specification,
is the central wavelength of the fiber Bragg grating (8),
is the elasto-optic coefficient of the optical fiber material;
the relation between the central wavelength of the fiber Bragg grating (8) and the switch rail/point rail rotational displacement is calibrated by the formula (1), and the on-line monitoring of the switch rail/point rail rotational displacement is realized.
5. A method for evaluating the displacement of a movable rail of a railway turnout is characterized by comprising the following steps:
step 1: installing a movable rail displacement monitoring device of a railway turnout in any one of claims 1 to 3 on a track bed plate between specified turnout sleepers, and calibrating the corresponding relation between switch rail/point rail conversion displacement and output center wavelength offset;
step 2: time-averaged division of the overall point/point transitionnPortions of each portion of time intervalΔtReading the corresponding displacement D of the movable point/point at regular time intervals during the transition i And recording;
and step 3: capturing recorded displacement data and constructing D based on displacement-time i -T curve, seeking displacement law;
and 4, step 4: and according to the monitoring data, a technical scheme for railway safety maintenance is formulated to ensure healthy operation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211439114.7A CN115574724A (en) | 2022-11-15 | 2022-11-15 | Railway turnout movable steel rail displacement monitoring device, monitoring method and evaluation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211439114.7A CN115574724A (en) | 2022-11-15 | 2022-11-15 | Railway turnout movable steel rail displacement monitoring device, monitoring method and evaluation method |
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