CN105818838A - Axle counting sensor and axle counting detection method - Google Patents
Axle counting sensor and axle counting detection method Download PDFInfo
- Publication number
- CN105818838A CN105818838A CN201610257580.1A CN201610257580A CN105818838A CN 105818838 A CN105818838 A CN 105818838A CN 201610257580 A CN201610257580 A CN 201610257580A CN 105818838 A CN105818838 A CN 105818838A
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- China
- Prior art keywords
- sensor
- magnetic core
- count sensor
- axle counting
- axle count
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L1/00—Devices along the route controlled by interaction with the vehicle or vehicle train, e.g. pedals
- B61L1/16—Devices for counting axles; Devices for counting vehicles
- B61L1/163—Detection devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L1/00—Devices along the route controlled by interaction with the vehicle or vehicle train, e.g. pedals
- B61L1/16—Devices for counting axles; Devices for counting vehicles
- B61L1/168—Specific transmission details
Abstract
The invention provides an axle counting sensor and an axle counting detection method. The sensor comprises two magnetic core coils and corresponding function circuits, wherein the two magnetic core coils are packaged in an identical shell and use different oscillation frequencies; the two magnetic core coils detect the pass of metal wheels by an eddy current effect; when the metal wheels pass the sensor, eddy current is produced inside the metal wheels, so that energy of magnetic field is attenuated; and when the metal wheels continually approach the sensing face of the sensor, the energy of magnetic field is absorbed to cause attenuation, and the current of the sensor is gradually reduced. The current detected by the axle counting sensor is sent to an axle counting main unit by a current loop mode; the axle counting main unit can detect the state of the sensor and the movement condition of the wheels by detecting the current value and the current change condition of the two magnetic core coils; since the axle counting sensor uses the current to transmit the state information of the sensor, external disturbance is not liable to cause, and the stability and reliability of an axle counting system are greatly improved by using the axle counting sensor.
Description
Technical field
The present invention relates to railway signal system field, particularly relate to a kind of axle count sensor and meter shaft detection method.
Background technology
In rail transportation system, for checking track section or the train occupation state of switch section, general employing track circuit mode.But ,/idle inspection in the area that environment is special, is taken owing to track circuit cannot reliably carry out section, therefore, introduce meter shaft technology, by using induction axle count sensor, check the number of axle situation between two or more test point, it is judged that in section, whether have car to take.
Existing axle count sensor one, uses the mode that two transmission coils and two receiving coils are used in combination, and it has had the applicating history of decades as known technology.Owing to two transmission coils and two receiving coils of this axle count sensor need to be separately mounted to rail both sides, manufacture and install the most more complicated, therefore, use the product of this technical scheme day by day to reduce.
Existing axle count sensor two, uses the mode that a transmission coil and two receiving coils are used in combination, and this mode is current market mainstream application.Owing to transmission coil and two receiving coils of this axle count sensor are both needed to be encapsulated in an identical housing, therefore, the small product size using this technical scheme is relatively large.
Existing axle count sensor three, uses single coil, but needs group to use, and the two mounting distance is at more than 30cm-100cm, adjusts distance according to crossing vehicle speed speed.This mode is actually a kind of typical case's application of proximity transducer known technology.Owing to axle counting system is a kind of facility for failsafe, there is significant deficiency in this technical scheme from principle, it is impossible to ensures traffic safety, axle count sensor the most truly, therefore, do not have meter shaft product to use this technical scheme.
Existing axle count sensor four, two identical coils using identical frequency of oscillation are encapsulated in same housing, and the distance between two coils is 78-135mm.This axle count sensor is actually the mutation of axle count sensor three.A kind of axle count sensor that patent CN101311681A of square formation (Beijing) Science and Technology Ltd. is used, is encapsulated in sensor higher and identical for two frequencies of oscillation in a container, and the distance between two sensors is 78-135mm.This technical scheme is owing to using identical frequency of oscillation, on the other hand on the one hand existing between two coils and interfere, can obtain identical error result when by external disturbance, its safety, reliability and stability are the most poor, therefore, meter shaft product is not had to use this technical scheme.
All there is certain deficiency in above-mentioned existing axle count sensor technology.First two technology, owing to meeting fail-safe requirement, is welcome by market；Inherently there is defect for security in latter two technology, be not likely to be obtained accreditation in the railway signal system field with safety as life due to technical scheme.
Summary of the invention
It is an object of the invention to provide one be easily installed, small volume, strong interference immunity and be able to ensure that the fail-safe axle count sensor of axle counting system and meter shaft detection method thereof.
The present invention realizes its goal of the invention and be the technical scheme is that a kind of axle count sensor, including magnetic core coil and the corresponding functional circuit of be encapsulated in an identical casings two the different frequencies of oscillation of use, two magnetic core coils relative position in housing is parallel with rail bearing of trend.Two magnetic core coils detect the process of metallic wheel by eddy current effect.When metallic wheel is through sensor, and metallic wheel is internal produces vortex flow, causes magnetic field energy to decay；When metallic wheel is constantly near the sensitive surface of sensor, magnetic field energy is absorbed and is caused decay, and sensor current is gradually lowered.Detection electric current is sent to meter shaft main frame by electric current loop mode by axle count sensor, and by current value and the curent change situation of two magnetic core coils of detection, meter shaft main frame can detect sensor states and wheel movement situation.Owing to axle count sensor uses electric current to carry out transmission sensor status information, it is not easily susceptible to external interference, therefore, uses this axle count sensor that stability and the reliability of axle counting system can be greatly improved.
Two magnetic core coils of described axle count sensor all use the process of eddy current effect detection metallic wheel.
Two magnetic core coils of described axle count sensor are respectively adopted different frequencies of oscillation.
The detection electric current of two magnetic core coils is sent to meter shaft main frame by electric current loop mode by described axle count sensor respectively.
Described meter shaft main frame, by detecting current value and the curent change situation of two magnetic core coils, detects state and the wheel movement situation of described axle count sensor.
The distance of two magnetic core coils of described axle count sensor, should ensure that two magnetic core coils can be detected simultaneously by this wheel when rail rail level position above satisfactory wheel centrage between two coils.
Described meter shaft detection method, including herein below: when detecting electric current higher than high level A, represents sensor drift or comes off；When detecting electric current and be less than high level A but higher than intermediate value B, indicate without car；When detecting electric current and be less than intermediate value B but higher than low value C, indicate car；When detecting electric current less than low value C, represent sensor fault.
Compared with prior art, the invention has the beneficial effects as follows:
One, compared with prior art one, a pair magnetic core coil of the present invention can be directly encapsulated in an identical housing, is arranged on rail side.Product is simple, manufacturing cost is relatively low and is easily installed.
Two, compared with prior art two, the present invention only uses two magnetic core coils, it is possible to obtain less encapsulation volume.
Three, compared with using identical frequency of oscillation with two magnetic core coils of prior art three, four, the present invention uses the magnetic core coil of two different frequencies of oscillation, interfering more weak and being difficult to obtain identical interference result when by identical external disturbance between coil.Therefore, the safety of the axle count sensor of the present invention, reliability and stability are the highest, meet the requirement of failure to safety principle.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the axle count sensor of prior art one；
Fig. 2 is the schematic diagram of the axle count sensor of prior art two；
Fig. 3 is the schematic diagram of the axle count sensor of prior art three；
Fig. 4 is the schematic diagram of the axle count sensor of prior art four；
Fig. 5 is the schematic diagram of a kind of axle count sensor of the present invention；
Fig. 6 is the theory diagram of a kind of axle count sensor of the present invention；
Fig. 7 is the detection electric current graph of a relation with sensor states of the meter shaft detection method of the present invention；
Fig. 8 is the schematic diagram of the specific embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and the specific embodiments, the present invention is described in further detail:
A kind of axle count sensor of the present invention and meter shaft detection method, its preferably detailed description of the invention is:
Fig. 5 is the schematic diagram of a kind of axle count sensor of the present invention.Owing to two magnetic core coils of described axle count sensor use different frequencies of oscillation, its magnetic field environment produced there are differences, and therefore, uses difform figure to represent.
Fig. 6 is the theory diagram of a kind of axle count sensor of the present invention.Described axle count sensor is made up of two magnetic core coils using different frequency of oscillation and functional circuit, and is encapsulated in an identical housing.For each magnetic core coil, it is separately installed with an oscillating circuit, a current processing circuits and an electric current loop transtation mission circuit.
Axle count sensor can be arranged on the side of rail by metal fixture.Time near axle count sensor without wheel, the magnetic field of magnetic core coil is only by the minor way of rail, and sensor current is higher；When the metal rim of wheel is near the magnetic core coil of axle count sensor, wheel rim is internal produces vortex flow, causes the magnetic field energy of magnetic core coil to decay；When wheel rim is constantly near the sensitive surface of sensor, magnetic field energy is absorbed and is caused decay, and sensor current is gradually lowered, and when decay reaches to a certain degree, high frequency generator stops oscillation, and sensor current arrives minimum.
By current value and the curent change situation of two magnetic core coils of detection axle count sensor, it is possible to detection sensor states and wheel movement situation.When train wheel is by rail rail level, due to difference in position between wheel and two magnetic core coils of axle count sensor, the detection electric current of two magnetic core coils will appear from nonsynchronous change, by gathering this change it may determine that wheel movement situation.
The frequency of oscillation that two magnetic core coils of axle count sensor and corresponding oscillating circuit are used should possess larger difference.Its object is to: be on the one hand to reduce interfering between two same magnetic field；On the other hand be to use magnetic field that two frequencies of oscillation are identical when by identical external disturbance, it may appear that identical error result, and the correctness of this error result to be meter shaft main frame be cannot be distinguished by.Therefore, it is necessary to avoid using identical frequency of oscillation.
The detection electric current of two magnetic core coils is transmitted directly to meter shaft main frame by electric current loop mode by axle count sensor, and meter shaft main frame is by gathering this detection electric current and testing the scope of this detection current value and judge the current state of sensor.
The effect of the electric current loop transtation mission circuit of axle count sensor is i.e. that the detection electric current after processing is sent to meter shaft main frame.Using electric current loop mode, when detecting electric current and being constant, the transmission electric current on transmission line can transmit more than several kilometers and keep constant；When detecting curent change, the transmission electric current on transmission line can be along with changing.Transmission electric current is detection electric current electric current after amplifying and processing.Owing to transmission electric current is not readily susceptible to external interference, the transmission anti-interference using the axle counting system of this axle count sensor is relatively strong, and the reliability and stability of axle counting system are the highest.
Each magnetic core coil and related circuit all can be connected with meter shaft main frame by two core transmission cables.Therefore, each axle count sensor need to be connected with meter shaft main frame by two two core transmission cables or four core transmission cables.Meter shaft main frame is by the current value on detection transmission cable respectively and curent change situation, it is judged that the current state of axle count sensor and wheel movement situation.
In engineer applied, stelliform connection topology configuration typically can be used to realize an axle counting system.Being connected with an interface board of meter shaft main frame by a quad by each axle count sensor, this interface board both can be mutual with other boards by processing after current signal, it is also possible to the sensor states obtained after processing is mutual with other boards.
In the present embodiment, axle count sensor is arranged on the web of the rail position of rail side, and the relative position of two magnetic core coils is parallel with rail bearing of trend, and the distance between two coils is about 80-150mm.Distance between two coils depends on the requirement about technical conditions of the detecting distance of coil and meter shaft.
In the present embodiment, the transmission current value range of axle count sensor is 0mA-20mA.
In the present embodiment, oscillating circuit, current processing circuits and electric current loop transtation mission circuit the most all use the above device of technical grade, and the enclosure interior of axle count sensor uses special material to carry out encapsulating process.This axle count sensor uses L-type metal rack to be arranged on the side of rail.
The above; being only the present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; the change that can readily occur in or replacement, all should contain within protection scope of the present invention.
Claims (6)
1. an axle count sensor, it is characterised in that the magnetic core coils of the different frequencies of oscillation of two uses including in described sensor being encapsulated in an identical casings and corresponding functional circuit, two coils relative position in housing is parallel with rail bearing of trend.
Axle count sensor the most according to claim 1, it is characterised in that said two magnetic core coil all uses the process of eddy current effect detection metallic wheel.
Axle count sensor the most according to claim 1, it is characterised in that the detection electric current of two magnetic core coils is sent to meter shaft main frame by electric current loop mode by described sensor respectively.
Axle count sensor the most according to claim 1, it is characterised in that meter shaft main frame, by gathering current value and the curent change situation of two magnetic core coils, detects state and the wheel movement situation of described sensor.
Axle count sensor the most according to claim 1, it is characterized in that, the distance of two magnetic core coils of described sensor, should ensure that two magnetic core coils can be detected simultaneously by this wheel when rail rail level position above satisfactory wheel centrage between two coils.
6. according to the meter shaft detection method of the axle count sensor described in any one of claim 1 to 6, it is characterised in that include content: when detecting electric current higher than high level A, represent sensor drift or come off；When detecting electric current and be less than high level A but higher than intermediate value B, indicate without car；When detecting electric current and be less than intermediate value B but higher than low value C, indicate car；When detecting electric current less than low value C, represent sensor fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610257580.1A CN105818838B (en) | 2016-04-22 | 2016-04-22 | A kind of axle count sensor and meter shaft detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610257580.1A CN105818838B (en) | 2016-04-22 | 2016-04-22 | A kind of axle count sensor and meter shaft detection method |
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| CN105818838A true CN105818838A (en) | 2016-08-03 |
| CN105818838B CN105818838B (en) | 2018-04-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106994985A (en) * | 2017-03-14 | 2017-08-01 | 哈尔滨工业大学 | A kind of unilateral axle count sensor based on electromagnetic induction principle |
| CN111315628A (en) * | 2017-11-14 | 2020-06-19 | 西门子交通有限公司 | Sensor device |
| CN112319546A (en) * | 2020-10-28 | 2021-02-05 | 深圳科安达电子科技股份有限公司 | Axle counting induction system for monorail train |
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| US5333820A (en) * | 1993-02-18 | 1994-08-02 | Union Switch & Signal Inc. | Railway vehicle wheel detector utilizing magnetic differential bridge |
| CN101311682A (en) * | 2007-07-10 | 2008-11-26 | 方阵（北京）科技有限公司 | High-grade co-channel track axle count sensor |
| CN101311681A (en) * | 2007-07-10 | 2008-11-26 | 方阵（北京）科技有限公司 | Track traffic axle count sensor |
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| CN202389408U (en) * | 2011-11-17 | 2012-08-22 | 浙江万全信号设备有限公司 | Railway train axle counting device |
| CN103085842A (en) * | 2013-01-23 | 2013-05-08 | 成都铁路通信设备有限责任公司 | Detection system and detection method of straddle type light rail movable crossover line track sections |
| CN103693074A (en) * | 2013-12-18 | 2014-04-02 | 苏州瑞尔维电子科技有限公司 | Sensor for monitoring train operation conditions |
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2016
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| US5333820A (en) * | 1993-02-18 | 1994-08-02 | Union Switch & Signal Inc. | Railway vehicle wheel detector utilizing magnetic differential bridge |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106994985A (en) * | 2017-03-14 | 2017-08-01 | 哈尔滨工业大学 | A kind of unilateral axle count sensor based on electromagnetic induction principle |
| CN111315628A (en) * | 2017-11-14 | 2020-06-19 | 西门子交通有限公司 | Sensor device |
| CN111315628B (en) * | 2017-11-14 | 2022-04-01 | 西门子交通有限公司 | Sensor device |
| CN112319546A (en) * | 2020-10-28 | 2021-02-05 | 深圳科安达电子科技股份有限公司 | Axle counting induction system for monorail train |
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| CN105818838B (en) | 2018-04-24 |
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