CN110806236A - Dynamic detection device for bow net pressure and hard points - Google Patents
Dynamic detection device for bow net pressure and hard points Download PDFInfo
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- CN110806236A CN110806236A CN201911142169.XA CN201911142169A CN110806236A CN 110806236 A CN110806236 A CN 110806236A CN 201911142169 A CN201911142169 A CN 201911142169A CN 110806236 A CN110806236 A CN 110806236A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/08—Railway vehicles
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Abstract
The invention discloses a bow net pressure and hard point dynamic detection device, comprising: casing and treater and setting are in optic fibre pressure sensor and optic fibre acceleration sensor in the casing, be equipped with the spring in the casing, optic fibre pressure sensor installs the upper end of spring, the upper end of casing is used for being connected with the slide, the lower extreme of casing is used for being connected with the bow of pantograph. Adopt optic fibre pressure sensor and optic fibre acceleration sensor to carry out bow net pressure and hard spot and detect, can not receive the interference of the strong magnetism of high pressure, can acquire accurate data, optic fibre sensor's cable is the optic fibre material in addition, does not receive the interference of the strong magnetism of high pressure, and data transmission is reliable and stable, secondly, with the integrated encapsulation of optic fibre pressure sensor and optic fibre acceleration sensor in a casing, the installation of being convenient for is maintained.
Description
Technical Field
The invention relates to the field of vehicles, in particular to a bow net pressure and hard point dynamic detection device.
Background
With the development of rail transit, the requirements on the running safety of rail trains, the stability of power supply equipment and the reliability of rail equipment are increasingly improved.
The contact net and the pantograph are important components of the train, wherein the contact net is overhead equipment erected along a track line as a whole, and the pantograph is important equipment for taking current from the contact net of the electric passenger car and takes the current through sliding friction of the sliding plate and the contact net. Reliable contact and interaction between a contact net and a pantograph are important conditions for ensuring good current collection, namely a certain contact pressure is required between the pantograph and a contact line, electric energy can be normally obtained only by normal contact between the contact net and the pantograph, and the service life of the pantograph is shortened due to severe increase of abrasion caused by excessive acting force between the contact net and the pantograph; meanwhile, the acting force between the contact net and the pantograph is not enough, so that occasional circuit off-line conditions are caused, the power supply is interrupted, even sparks or electric arcs are caused, the contact line is burnt out, and the action relationship between the pantograph nets is very important.
The main technical means of measuring bow net pressure and hard spot is contact detection at present, adopts traditional piezoelectric type or foil gage formula electron class sensor to carry out bow net pressure and hard spot's detection, and this kind of electron class sensor itself is uninsulated, receives the influence of spark, strong electromagnetic field interference very easily, is difficult to realize intelligent state analysis and early warning, simultaneously because the restriction of mounted position on the pantograph, can not direct measurement bow net contact pressure, leads to measuring error very big.
Therefore, how to provide a dynamic detection device for bow net pressure and hard spot, which is accurate in measurement, is a technical problem that needs to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a bow net pressure and hard point dynamic detection device, which can effectively solve the problem of low measurement precision.
In order to solve the technical problems, the invention provides the following technical scheme:
a bow net pressure and hard spot dynamic detection device comprises: casing and treater and setting are in optic fibre pressure sensor and optic fibre acceleration sensor in the casing, be equipped with the spring in the casing, optic fibre pressure sensor installs the upper end of spring, the upper end of casing is used for being connected with the slide, the lower extreme of casing is used for being connected with the bow of pantograph, optic fibre pressure sensor is used for detecting the lifting force of pantograph, optic fibre acceleration sensor is used for detecting the vertical acceleration of pantograph, the treater is used for obtaining bow net contact pressure according to the lifting force of pantograph and vertical acceleration and the quality of pantograph.
Preferably, the case is an aluminum lithium alloy case.
Preferably, the housing includes a bottom case and an upper cover, and the upper cover is detachably connected to the bottom case.
Preferably, the optical fiber pressure sensor and the optical fiber acceleration sensor are mounted side by side in the housing.
Preferably, a pantograph balance rod is arranged on a pantograph head of the pantograph, two ends of the balance rod are respectively provided with one shell, and the middle part of the balance rod is connected with the pantograph head.
Preferably, the bottom of the shell is provided with a spring cavity which is used for accommodating the spring and extends downwards.
Compared with the prior art, the technical scheme has the following advantages:
the invention provides a bow net pressure and hard point dynamic detection device, which comprises: casing and treater and setting up optic fibre pressure sensor and optic fibre acceleration sensor in the casing, be equipped with the spring in the casing, optic fibre pressure sensor installs the upper end at the spring, the upper end of casing is used for being connected with the slide, the lower extreme of casing is used for being connected with the bow of pantograph, optic fibre pressure sensor is used for detecting the lifting force of pantograph, optic fibre acceleration sensor is used for detecting the vertical acceleration of pantograph, the treater is used for lifting power and vertical acceleration and the quality acquisition bow net contact pressure of pantograph according to the pantograph. Adopt optic fibre pressure sensor and optic fibre acceleration sensor to carry out bow net pressure and hard spot and detect, can not receive the interference of the strong magnetism of high pressure, can acquire accurate data, optic fibre sensor's cable is the optic fibre material in addition, does not receive the interference of the strong magnetism of high pressure, and data transmission is reliable and stable, secondly, with the integrated encapsulation of optic fibre pressure sensor and optic fibre acceleration sensor in a casing, the installation of being convenient for.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of an explosion structure of a bow net pressure and hard spot dynamic detection device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pantograph-catenary pressure and hard point dynamic detection device installed on a pantograph and a sliding plate according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a bow net pressure and hard spot dynamic detection device according to an embodiment of the present invention.
The reference numbers are as follows:
the device comprises a shell 1, a sliding plate 2, a pantograph 3, an upper cover 4, a bottom shell 5, an optical fiber pressure sensor 6, an optical fiber acceleration sensor 7, a spring 8, a balance rod 9 and a bolt 10.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of ways different from those described herein and similar generalizations can be made by those skilled in the art without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
Referring to fig. 1 to 3, fig. 1 is a schematic diagram illustrating an explosion structure of a dynamic bow net pressure and hard spot detection device according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of a pantograph-catenary pressure and hard point dynamic detection device installed on a pantograph and a sliding plate according to an embodiment of the present invention; fig. 3 is a schematic structural diagram of a bow net pressure and hard spot dynamic detection device according to an embodiment of the present invention.
One embodiment of the present invention provides a dynamic bow net pressure and hard point detection device, comprising: the detection device comprises a shell 1, a processor, an optical fiber pressure sensor 6 and an optical fiber acceleration sensor 7 which are arranged in the shell 1, wherein a spring 8 is arranged in the shell 1, two ends of the spring 8 are respectively connected with the optical fiber pressure sensor 6 and a pantograph 3, specifically, the optical fiber pressure sensor 6 is arranged at the upper end of the spring 8 to realize the direct contact of the optical fiber pressure sensor 6 and the spring 8, the bottom of the shell 1 is provided with a spring 8 cavity which is used for accommodating the spring 8 and extends downwards, the upper end of the shell 1 is used for being connected with a sliding plate 2, the optical fiber pressure sensor 6 can be arranged in the shell 1 through a vertically arranged bolt 10, the optical fiber pressure sensor 6 and the optical fiber acceleration sensor 7 are adopted to detect the pressure and the hard point of a pantograph net, the detection device can not be interfered by high-voltage strong magnetism and can acquire accurate data, in addition, cables of the, data transmission is stable and reliable, and secondly, light pressure sensor and optical fiber acceleration sensor 7 are integrated and packaged in a shell 1, so that the installation is convenient.
In addition, the system also comprises a data acquisition module: based on the technical principle of a wavelength tunable scanning laser, a high-speed parallel bus type real-time processor array is constructed by cascading a plurality of FPGA (field programmable gate array), the data processing capacity reaches 10Gbit/s, dynamic wavelength signal demodulation of each of which reaches 500Hz can be synchronously carried out, signals of an optical fiber pressure sensor 6 and an optical fiber acceleration sensor 7 are collected in real time and transmitted to a data integration and processing computer by a network protocol, and the signals are subjected to real-time statistical analysis, overrun judgment, overrun editing, report output, chart statistics and other processing.
Specifically, a balance rod 9 is respectively arranged at two ends of the pantograph 3, a shell 1 is respectively arranged at two ends of the balance rod 9, the middle part of the balance rod 9 is connected with the head of the pantograph 3, and a light pressure sensor and an optical fiber acceleration sensor 7 are respectively arranged in each shell 1.
When the pantograph 3 of the electric bus moves, the fiber bragg grating of the sensor deforms along with the action of the force of the mass block, the different deformation of the fiber bragg grating is corresponding to the different forces, so that the wavelength of the reflected light signal is changed rapidly, the reflected light signal is input to the data acquisition module, and finally the reflected light signal is output to the detection host, and the pantograph-catenary pressure and the hard point value are output in real time.
Specifically, a front-end processor box used for containing a photoelectric conversion module and a detection host is arranged in the vehicle, a high-voltage box used for containing an isolation transformer and a data acquisition module is arranged on the vehicle roof, the data acquisition module collects signals of an optical fiber pressure sensor 6 and an optical fiber acceleration sensor 7 in real time, transmits the signals to the photoelectric conversion module through optical fibers, and finally transmits the signals to the detection host for detection, wherein a 110 VDC-to-220 VAC inverter converts a 110VDC power supply in the vehicle into alternating current, then transmits the alternating current to a super-isolation transformer in the vehicle, then transmits the alternating current to the isolation transformer on the vehicle roof, and finally supplies power to the data.
The optical fiber pressure sensor 6: the pressure sensitive cavity is composed of two parallel planes with reflectivity, light beams are reflected for multiple times to form multi-beam interference, and under the action of pressure, the length of the cavity changes correspondingly to modulate incident light. Contain the light output signal of pressure information through the demodulation, just can acquire the pressure value, really realized the full gloss detection to pressure signal, have probe and transmission line do not supply power, anti-electromagnetic interference, small in size, remote light signal transmission etc. a great deal of advantage, it is installed in 1 inside spring 8 upper end of casing, with spring 8 direct contact, but direct measurement bow net contact pressure, its measuring range is 0 ~ 200N, precision 1N, the wavelength range: 1525nm to 1565 nm.
Optical fiber acceleration sensor 7: the acceleration detection mass block, the elastic supporting body, the optical reflection micro-mirror and the light incidence and emergence waveguide are directly integrated on a tiny chip, so that the all-optical detection of acceleration signals is really realized, and the acceleration sensor has the advantages of no power supply of a probe and a transmission line, electromagnetic interference resistance, large dynamic range, small volume, long-distance optical signal transmission and the like. Acceleration sensor installs inside 8 boxes of spring, and its measuring range is 0 ~ 150g, precision 1g, wavelength range: 1525nm to 1565 nm.
When the train is static, the pantograph 3 rises, the pantograph-catenary contacts, and at the moment, the pantograph-catenary contacts, namely static contact pressure, and the magnitude of the static contact pressure is mainly related to factors such as pressure generated by an air bag of the pantograph 3, tension of the catenary and the like.
When the train runs, the pantograph 3 vibrates to generate vertical acceleration, and the contact pressure of the pantograph and catenary changes at any time; meanwhile, the vertical acceleration and the bow net contact pressure can also change at any time; meanwhile, due to the influence of vibration of the locomotive, wind power and other factors, the pantograph 3 vibrates at a high speed in the vertical direction, and an inertia force is generated. The inertial force has a large influence on the pantograph-catenary contact pressure, and is determined by the reduced mass which changes with the change of the height of the pantograph 3 and the vertical acceleration. The calculation method of the pantograph-catenary contact pressure F in the running of the electric bus comprises the following steps:
F＝Ft+Fa
in the formula, FtLifting force for the pantograph 3; faIs the pantograph 3 inertial force. FaM is the mass of the pantograph 3; a is the acceleration of the pantograph 3, wherein the lifting force F of the pantograph 3tCan be obtained by an optical fiber pressure sensor 6, and the acceleration a of the pantograph 3 can be obtained by an optical fiber acceleration sensor 7And taking the bow net contact pressure F, and calculating and obtaining the bow net contact pressure F by a processor.
An optical fiber pressure sensor 6 is arranged in a shell 1, an optical fiber acceleration sensor 7 is arranged at the bottom edge of the optical fiber pressure sensor 6, the left side and the right side of two sliding plates 2 are respectively provided with 1 contact point, the total number of the contact points is 2, 4 signals can be measured, and the pressure signals N are respectively 1 pressure signal N at the left sideLAnd 1 acceleration signal αLRight 1 pressure signal NRAnd 1 acceleration signal aRThe X-direction (horizontal direction) acting force (friction) at the left and right ends of the sliding plate 2 is FLxAnd FRXAnd Z-direction (vertical direction) forces (contact pressures) are respectively FLzAnd FRz
Taking the left end of the sliding plate 2 as an example, the measured values of the two optical fiber pressure sensors 6 are separated in the X direction and the Z direction through a cross-talk compensation matrix, and the formula is as follows:
in the same way, the Z-direction component force of the right end of the sliding plate 2 can be obtained. Since the support mechanism is mounted below the balance bar 9, the contact pressure should be minus the weight mg of the slide 2. Contact pressure F between bow net in static stateNIs composed of
FN＝FLz+FRz-mg
In order to improve the measurement accuracy in the dynamic state, it is also necessary to correct the inertial force generated by the vibration of the slide plate 2. The acceleration of the left and right ends of the sliding plate 2 is aLAnd aRThe normalized mass is mLAnd mRThen Z-direction acting force F is generated at the left end and the right end of the sliding plate 2LAnd FRAre respectively as
FL＝FLz+mLaL
FR＝FRz+mRaR
At this time, the contact pressure F between the bow netNIs composed of
FN＝FLz+FRz+mLaL+mRaR-mg
Specifically, the shell 1 is preferably an aluminum lithium alloy shell 1, the shell 1 comprises a bottom shell 5 and an upper cover 4, the upper cover 4 is detachably connected with the bottom shell 5, the aluminum lithium alloy shell 1 can be processed on a high-precision numerical control CNC (computer numerical control) machine tool, the material has the characteristics of high strength, light weight, corrosion resistance and the like, the pantograph 3 can not be corroded or distorted and deformed in normal use under different weather and temperature conditions, the traditional pantograph 3 balance spring 8 box can be directly replaced through the packaging shell 1, the mounting is stable and reliable, the dynamic response characteristic is good, the device has the characteristics of small mass, high precision, good linearity, small resolution, large output signal, strong overload capacity, electromagnetic interference resistance, high resonance frequency, dynamic and static detection requirements and the like, namely the quality of the sensor assembly can not change the return quality of the pantograph 3 head, but also ensures enough mechanical strength and can directly and accurately measure the bow net pressure and hard points.
It should also be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The utility model provides a bow net pressure and hard spot dynamic verification device which characterized in that includes: casing and treater and setting are in optic fibre pressure sensor and optic fibre acceleration sensor in the casing, be equipped with the spring in the casing, optic fibre pressure sensor installs the upper end of spring, the upper end of casing is used for being connected with the slide, the lower extreme of spring is used for being connected with the pantograph, optic fibre pressure sensor is used for detecting the lifting force of pantograph, optic fibre acceleration sensor is used for detecting the vertical acceleration of pantograph, the treater is used for obtaining bow net contact pressure according to the lifting force of pantograph and vertical acceleration and the quality of pantograph.
2. The pantograph pressure and hard point dynamic detection device of claim 1, wherein the housing is an aluminum lithium alloy housing.
3. The pantograph pressure and hard point dynamic detection device of claim 2, wherein the housing includes a bottom housing and a top cover, the top cover being removably connected to the bottom housing.
4. The pantograph pressure and hard point dynamic detection device of claim 3, wherein said fiber optic pressure sensor and said fiber optic acceleration sensor are mounted side-by-side within said housing.
5. The pantograph pressure and hard spot dynamic detection device according to any one of claims 1 to 4, wherein a pantograph balance bar is provided on a head of the pantograph, one of said housings is provided on each of both ends of said balance bar, and a middle portion of said balance bar is connected to said head.
6. The pantograph pressure and hard point dynamic detection device of claim 5, wherein said housing bottom is provided with a downwardly extending spring cavity for receiving said spring.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112129445A (en) * | 2020-09-27 | 2020-12-25 | 中国科学院力学研究所 | Bow net contact force on-line test scheme |
| CN112161734A (en) * | 2020-10-09 | 2021-01-01 | 西南交通大学 | Pantograph bow head conical diaphragm capsule force measuring device and calibration device thereof |
| CN112817232A (en) * | 2021-01-05 | 2021-05-18 | 株洲中车时代电气股份有限公司 | Control method and device for pantograph of train |
| CN114001850A (en) * | 2021-10-25 | 2022-02-01 | 南京地铁建设有限责任公司 | Pantograph pressure detection method and system |
| CN114877932A (en) * | 2022-04-20 | 2022-08-09 | 北京运达华开科技有限公司 | Pressure hard spot check out test set |
| CN115683005A (en) * | 2022-11-03 | 2023-02-03 | 清华大学 | Bow net contact point detection device and method based on pressure sensor |
| CN115723577A (en) * | 2022-11-11 | 2023-03-03 | 北京中车赛德铁道电气科技有限公司 | High-speed pantograph active control sensor mounting structure and control method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112129445A (en) * | 2020-09-27 | 2020-12-25 | 中国科学院力学研究所 | Bow net contact force on-line test scheme |
| CN112161734A (en) * | 2020-10-09 | 2021-01-01 | 西南交通大学 | Pantograph bow head conical diaphragm capsule force measuring device and calibration device thereof |
| CN112817232A (en) * | 2021-01-05 | 2021-05-18 | 株洲中车时代电气股份有限公司 | Control method and device for pantograph of train |
| CN112817232B (en) * | 2021-01-05 | 2022-02-25 | 株洲中车时代电气股份有限公司 | Control method and device for pantograph of train |
| CN114001850A (en) * | 2021-10-25 | 2022-02-01 | 南京地铁建设有限责任公司 | Pantograph pressure detection method and system |
| CN114877932A (en) * | 2022-04-20 | 2022-08-09 | 北京运达华开科技有限公司 | Pressure hard spot check out test set |
| CN114877932B (en) * | 2022-04-20 | 2023-02-17 | 北京运达华开科技有限公司 | Pressure hard spot check out test set |
| CN115683005A (en) * | 2022-11-03 | 2023-02-03 | 清华大学 | Bow net contact point detection device and method based on pressure sensor |
| CN115723577A (en) * | 2022-11-11 | 2023-03-03 | 北京中车赛德铁道电气科技有限公司 | High-speed pantograph active control sensor mounting structure and control method |
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