CN2617645Y - Active wheel sensor - Google Patents
Active wheel sensor Download PDFInfo
- Publication number
- CN2617645Y CN2617645Y CN 03226275 CN03226275U CN2617645Y CN 2617645 Y CN2617645 Y CN 2617645Y CN 03226275 CN03226275 CN 03226275 CN 03226275 U CN03226275 U CN 03226275U CN 2617645 Y CN2617645 Y CN 2617645Y
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- China
- Prior art keywords
- wheel sensor
- active wheel
- frequency generator
- schmidt trigger
- utility
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
The utility model discloses an active wheel sensor, which aims to solve the technical problems that the wheel passing or approaching signal indicate can still be accurately given when vehicle speed is low or zero. The utility model adopts the technical proposal that: an active wheel sensor comprises a DC power supply, a LC high-frequency generator, a detector, a Schmidt trigger and a signal amplifier, all of which are sequentially connected, wherein the inductive coil of the LC high-frequency generator is sealed in a magnetic pot. The leading-out wire of the inductive coil is welded on the circuit board in the lower part of the inductive coil. The detector, the Schmidt trigger and the signal amplifier are all arranged on the circuit board. Compared with the prior art, the sensor comprising the LC high-frequency generator, the detector, the Schmidt trigger and the signal amplifier can give the wheel passing or approaching signal accurately in the range of 0 to 360 km/h when connected with the power supply. The utility model has the advantages of strong anti-interference and being applicable to the railway.
Description
Technical field
The utility model relates to a kind of railway wheel sensor, and particularly a kind of being installed on the rail is when wheel of vehicle can produce the sensor of electric impulse signal when its installation site.
Background technology
At present, the wheel sensor that railway uses generally is passive sensor, adopts permanent magnet to add the induction coil and makes, and is also referred to as magnet steel.Its principle of work is when the magnetic field that wheel process permanent magnet produces, the disturbance that magnetic field changes that exposes to permanent magnet, the magnetic flow that is equivalent in the magnet steel induced inside coil changes, the variation of induction coil interior flux will produce an induced electromotive force in coil, its external presentation is promptly drawn line end at coil two and formed voltage difference.Wheel produces the impulse singla of an approximate single sinusoidal periodic signal approaching magnet steel, arriving in magnet steel and the process away from magnet steel at the two ends of induction coil, this impulse singla is wheel through the out-of-date wheel process signal that is detected.The size of induced signal is relevant with the speed of flux change in the coil, and flux change is fast more, and the induced voltage that produces in the coil is just big more, and flux change is slow more, and the induced voltage that produces in the coil is just more little.The speed of flux change is by the speed decision of wheel process, thereby when train passed through fast, passive magnet steel sensor can produce the indication of good impulse singla as the wheel process.But, when train is very low by speed, be lower than 5km/h, will be very faint by the impulse singla that this way produces, can not correctly indicate wheel to pass through information in actual applications.In addition, the permanent magnet type of passive magnet steel also can be As time goes on, to wheel through the remagnetization of part and decay gradually, though thereby passive magnet steel the advantage of exempting to power is arranged, there is service life and adapt to the vice proper of low-speed performance difference.Simultaneously, also exist intrinsic contradictions between the anti-interference resistance of passive magnet steel and the sensitivity.
Summary of the invention
The purpose of this utility model provides a kind of active wheel sensor, the technical matters that solves is very low even when being zero when running velocity, still can provide exactly wheel by or the indication of close signal, the wheel that is applicable to high speed moving vehicle is simultaneously surveyed, can be under 0 to 360km/h detecting wheel and provide the electric signal indication reliably, and have very high anti-interference resistance.
The utility model is by the following technical solutions: a kind of active wheel sensor, has direct supply, LC high frequency generator, detecter, Schmidt trigger and signal amplifier are linked in sequence, the inductance coil of described LC high frequency generator is potted in the magnetic jar of embedding in the shell, the pig-tail wire of inductance coil is welded on the circuit card that is positioned at the inductance coil bottom, and described detecter, Schmidt trigger and signal amplifier are arranged on the circuit card.
Inductance coil of the present utility model is a picture control coil.
Epoxy resin embedding layer is arranged below the circuit card of the present utility model, and plastic roof is arranged at the top of magnetic jar.
Shell of the present utility model is cast aluminium or glass fibre reinforced plastics casing.
The upper surface of inductance coil of the present utility model is lower than 4 millimeters of magnetic jar upper surfaces.
The aerotron of LC high frequency generator of the present utility model adopts 2N2222, and the diode of detecter adopts 1N5819, and three aerotrons of Schmidt trigger adopt 2N2222, and the aerotron of amplifier adopts 2SD822.
The utility model compared with prior art, in the enclosure, form sensor by LC high frequency generator, detecter, Schmidt trigger and signal amplification circuit, when power supply is supplied with sensor, oscillator produces a high-frequency alternating magnetic field zone at the driving surface of sensor, and through out-of-date, oscillator is in the change procedure of vibration and this two states of failure of oscillation as train wheel, can provide exactly 0 to 360km/h the time wheel by or close signal, strong anti-interference performance.
Description of drawings
Fig. 1 is the section of structure of the utility model embodiment.
Fig. 2 is the circuit block diagram of the utility model embodiment.
Fig. 3 is the schematic circuit diagram of Fig. 2.
The specific embodiment
Below in conjunction with drawings and Examples the utility model is described in further detail.As shown in Figure 2, the utility model is linked in sequence by LC high frequency generator, detecter, Schmidt trigger and signal amplifier and forms sensor.When DC power supply, the LC high frequency generator is the alternating magnetic field zone that sensitive surface produces a high frequency at the driving surface of sensor, be equivalent to inductance coil in-to-in alternating magnetic field, as metal object, be ferromagnetic material when entering this alternating magnetic field zone, metal object has changed the equivalence vibration inductance of former pierce circuit, thereby the original vibration that has destroyed oscillator produces condition, cause oscillation amplitude reduction, the oscillation frequency of oscillator to descend thus, even the blocking of oscillator.Angle from energy exchange, its physical process can be regarded as: when metal object enters the alternating magnetic field zone that is produced by oscillator, real core metal object will produce sizable vortex flow in alternating magnetic field, vortex flow has absorbed and has been in the oscillation energy that electric energy, magnetic energy exchange repeatedly in the oscillator, destroyed the equilibrium conditions of oscillator vibration, thereby vibration is weakened so that failure of oscillation.Work as metal object, when promptly ferromagnetic material left the residing area of space of alternating magnetic field, former oscillator recovered vibration.As train wheel, for ferromagnetic material through out-of-date, the LC high frequency generator is in vibration and failure of oscillation, or oscillation amplitude weakens greatly, in the change procedure of this two states, the state of this variation can be taken out by detecter, can convert thereof into the on-off signal of saltus step again via Schmidt trigger, promptly provide the wheel detectable signal after signal amplifies output.
The same section of the utility model and passive magnetic steel wheel working sensor is a groundwork of all having utilized electromagnetic induction, realizes that the railroad train wheel is by detecting; Different piece is:
(1) passive magnetic steel wheel sensor has directly utilized the law of electromagnetic induction, the law of electromagnetic induction that the utility model has been an indirect utilization;
(2) train is by speed when very low, the detection information that passive magnetic steel wheel sensor provides is very faint, when the speed of a motor vehicle is zero, no signal, it doesn't matter substantially by speed for signal magnitude that the utility model provides and train, even if when the speed of a motor vehicle was zero, wheel still exerted an influence to the oscillator in the utility model, thereby the utlity model has good design low speed applicability.
(3) high speed applicability of the present utility model depends on the detecter that adopts in the design broadband applicability to rate of following, Schmidt's shaping and the amplification output circuit of variable signal.This point is unchallenged in current device level.Basic evaluation method is the time constant τ of detecter, actual induction face length degree L of the present utility model, and adapt to speed of a motor vehicle v, satisfy between the three:
When getting v is 360km/h, and when L was 10cm, the computing value of τ was 1ms.
(4) do not need power supply during passive magnetic steel wheel working sensor, require for direct current (DC) during the work of the utility model wheel sensor.
The utility model adopts externally fed, and is simple in structure, and detecting wheel is accurate and reliable, obstacle overcome ability is extremely strong.
As shown in Figure 3, LC high frequency generator, detecter, Schmidt trigger and signal amplifier adopt breakaway-element to form.The aerotron Q1 of LC high frequency generator adopts 2N2222, and the diode D1 of detecter adopts 1N5819, and three aerotron Q2, Q3 and the Q4 of Schmidt trigger adopt 2N2222, and the aerotron Q5 of amplifier adopts 2SD822.
As shown in Figure 1, active wheel sensor comprises engineering plastics top cover 1, cast aluminium shell 2, magnetic jar 3, epoxy resin embedding layer 4, circuit card 5 and inductance coil 6.The round engineering plastics top cover 1 of upper end is potted in the top of cast aluminium shell 2, prevent exterior acid, alkali, salt, erosion and damage of external force such as greasy dirt, in-to-in inductance coil 6 is by the close coiled picture control coil of high strength enamelled wire, the magnetic jar 3 of packing into after the embedding moulding, picture control coil and magnetic jar 3 are combined closely, the upper surface that the upper surface of picture control coil should be lower than magnetic jar 3 forms embedded structure for 4 millimeters, carry out embedding again, magnetic jar 3 is potted in cast aluminium shell interior 2 again, be close to engineering plastics top cover 1 above the magnetic jar 3, picture control coil 6 pig-tail wires in the magnetic jar 3 are welded on the circuit card 5, and draw by the fairlead on the cast aluminium shell 2, circuit card 5 is sealed with epoxy resin embedding layer 4 below picture control coil.Detecter, Schmidt trigger and signal amplifier circuit are arranged on the circuit card 5.Shell 2 can also be a glass-felt plastic.
Claims (6)
1. active wheel sensor, it is characterized in that: have direct supply, LC high frequency generator, detecter, Schmidt trigger and signal amplifier are linked in sequence, the inductance coil of described LC high frequency generator (6) is potted in the magnetic jar (3) of embedding in the shell (2), the pig-tail wire of inductance coil (6) is welded on the circuit card (5) that is positioned at inductance coil (6) bottom, and described detecter, Schmidt trigger and signal amplifier are arranged on the circuit card (5).
2. active wheel sensor according to claim 1 is characterized in that: described inductance coil (6) is a picture control coil.
3. active wheel sensor according to claim 2 is characterized in that: epoxy resin embedding layer (4) is arranged below the described circuit card (5), and plastic roof (1) is arranged at the top of magnetic jar (3).
4. active wheel sensor according to claim 3 is characterized in that: described shell (2) is cast aluminium or glass fibre reinforced plastics casing.
5. active wheel sensor according to claim 4 is characterized in that: the upper surface of described inductance coil (6) is lower than 4 millimeters of magnetic jar (3) upper surfaces.
6. according to arbitrary described active wheel sensor in the claim 1 to 4, it is characterized in that: the aerotron of described LC high frequency generator adopts 2N2222, the diode of detecter adopts 1N5819, and three aerotrons of Schmidt trigger adopt 2N2222, and the aerotron of amplifier adopts 2SD822.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03226275 CN2617645Y (en) | 2003-05-15 | 2003-05-15 | Active wheel sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03226275 CN2617645Y (en) | 2003-05-15 | 2003-05-15 | Active wheel sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2617645Y true CN2617645Y (en) | 2004-05-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03226275 Expired - Lifetime CN2617645Y (en) | 2003-05-15 | 2003-05-15 | Active wheel sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2617645Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101311682B (en) * | 2007-07-10 | 2010-12-08 | 方阵（北京）科技有限公司 | High-grade co-channel track axle count sensor |
| CN105539508A (en) * | 2015-12-24 | 2016-05-04 | 北京安润通电子技术开发有限公司 | Sensor used for identifying motion direction of vehicle wheels and application method of sensor |
| CN108923776A (en) * | 2018-06-09 | 2018-11-30 | 成都凯天电子股份有限公司 | The cylindrical remote close switch of detection of inductance type |
-
2003
- 2003-05-15 CN CN 03226275 patent/CN2617645Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101311682B (en) * | 2007-07-10 | 2010-12-08 | 方阵（北京）科技有限公司 | High-grade co-channel track axle count sensor |
| CN105539508A (en) * | 2015-12-24 | 2016-05-04 | 北京安润通电子技术开发有限公司 | Sensor used for identifying motion direction of vehicle wheels and application method of sensor |
| CN105539508B (en) * | 2015-12-24 | 2017-04-26 | 北京安润通电子技术开发有限公司 | Sensor used for identifying motion direction of vehicle wheels and application method of sensor |
| CN108923776A (en) * | 2018-06-09 | 2018-11-30 | 成都凯天电子股份有限公司 | The cylindrical remote close switch of detection of inductance type |
| CN108923776B (en) * | 2018-06-09 | 2024-02-20 | 成都凯天电子股份有限公司 | Inductive cylindrical long-distance detection proximity switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHEN CITY YUANWANGGU INFORMATION TECHNOLOGY C Free format text: FORMER OWNER: CHAOYANG SCIENCE + TECHNOLOGY CO., LTD., SHENZHEN CITY Effective date: 20070427 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20070427 Address after: 518057. Building T-2, block B, Shennan Avenue Science Park, Shenzhen, Guangdong Patentee after: Invengo Information Technology Co., Ltd. Address before: 518057 new material port, Changyuan District, Nanshan District hi tech Development Zone, Guangdong, Shenzhen Patentee before: Chaoyang Science & Technology Co., Ltd., Shenzhen City |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130515 Granted publication date: 20040526 |