CN202686387U - Wheel sensor - Google Patents
Wheel sensor Download PDFInfo
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- CN202686387U CN202686387U CN 201220403984 CN201220403984U CN202686387U CN 202686387 U CN202686387 U CN 202686387U CN 201220403984 CN201220403984 CN 201220403984 CN 201220403984 U CN201220403984 U CN 201220403984U CN 202686387 U CN202686387 U CN 202686387U
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- wheel
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- wheel sensor
- oscillator
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Abstract
Provided is a wheel sensor. The wheel sensors which are used at present generally are passive sensors. Power cables and power substations near a rail, and steel rail signal current can cause high output noises of the passive wheel sensors, even at the time of vehicle reception. Consequently, extraction difficulty of induction signals is increased when a wheel passes by. The wheel sensor comprises an electrical eddy current non-contact detection sensor (1), a quartz crystal oscillator (5), a power amplifier (6), a high-frequency amplifier (7), a radiodetector (8), a low-frequency amplifier (9) and a schmitt trigger (10). The quartz crystal oscillator (5), the power amplifier (6), the high-frequency amplifier (7), the radiodetector (8), the low-frequency amplifier (9) and the schmitt trigger (10) are arranged on a circuit board (3) which is arranged inside the electrical eddy current non-contact detection sensor. A lead wire of an inductance coil of an inductor-capacitor (LC) oscillator (2) is welded on the circuit board. The electrical eddy current non-contact detection sensor is encapsulated with antifreezing sealing filling agents and sealed in an engineering plastic casing (4). The wheel sensor is used for wheel detection, axle counting and car counting of rail vehicles and passing speed measurement of the vehicles.
Description
technical field:
the utility model relates to a kind of guideway vehicle detection, monitoring equipment field, is specifically related to a kind of wheel sensor.
background technology:
existing active vehicle wheels sensor drives the antijamming capability of locomotive, electric locomotive poor to AC-DC-exchange way.At guideway vehicle, by instantaneous velocity, measure in application, the wheel sensor of current use is generally passive sensor.The principle of work of passive wheel sensor is electromagnetic induction principle, induction coil, on U-shaped permanent-magnet ferrite, consists of.In the induction coil magnetic field constant in permanent-magnet ferrite, when wheel, through out-of-date, the constant magnetic field of permanent-magnet ferrite, by disturbance, causes the magnetic flow of induction coil to change, produce induced electric motive force in coil, the mouth at induction coil forms voltage signal output.
in the process that the passive wheel sensor approaches, arrives and leave at wheel, the wheel process class signal produced at the two ends of coil is like monocyclic sinusoidal signal, the amplitude size of induced signal depends on the speed that wheel passes through, the speed that wheel passes through is faster, magnetic flux change in coil faster, the induced electric motive force that induction coil produces is higher, and the amplitude of the induced signal of output is also just larger; The speed that wheel passes through is slower, the magnetic flux change in coil also just slower, and the induced electric motive force produced in induction coil is also just lower, and the amplitude of the induced signal of output is also just lower.
the induced signal of passive wheel sensor output depends on the speed that wheel passes through, the speed of passing through when wheel is during lower than 3km/h, the amplitude of the induced signal that the passive wheel sensor produces is very little, and signal receiving end can't extract the signal that wheel passes through from noise.Because the principle of work of passive wheel sensor is electromagnetic induction principle, the poor anti jamming capability that causes the passive wheel sensor, the power cable on rail limit, substation, rail signal current even all cause the output noise of wheel sensor for no reason at all very high when connecing car, increased wheel by the time induced signal the extraction difficulty.The field intensity of the permanent-magnet ferrite in the passive wheel sensor is up to Gauss more than 4000, very easily occurs colliding ironware during installation, hinders hand, the phenomenon such as absorption scum, increased installation difficulty.
summary of the invention:
the purpose of this utility model is to make a kind of wheel sensor, simple in structure, highly sensitive, and adaptive capacity to environment, antijamming capability are strong, especially for AC-DC-exchange way, drive the anti-interference resistance of locomotive, electric locomotive superior.
above-mentioned purpose realizes by following technical scheme:
a kind of wheel sensor, its composition comprises: electric vortex type contact pointless detecting sensor, quartz oscillator, power amplifier, radioamplifier, detecter, low frequency amplifier, Schmidt trigger is arranged on the circuit card of described electric vortex type contact pointless detecting sensor inside, the pig-tail wire of the inductance coil of LC oscillator is welded on described circuit card, and described electric vortex type contact pointless detecting sensor is sealed in the engineering plastics shell by the embedding of antifreeze sealing extending agent.
described wheel sensor, the inductance coil of described LC oscillator is the PCB printed coil.
beneficial effect:
1. the utility model is compared with the existing passive wheel sensor, when the wheel sensor consisted of electric vortex type contact pointless detecting sensor externally provides power supply, surface at sensor produces a high-frequency alternating magnetic field, when wheel being arranged through out-of-date, it is even zero that the oscillation amplitude of LC oscillator coil weakens.When 0 ~ 360 km/h, can send accurately wheel through signal, and simple in structure, easy for installation, adaptive capacity to environment, antijamming capability are strong.
the utility model is compared with existing active vehicle wheels sensor, and the inductance of LC oscillator coil adopts the PCB printed coil, and treatment circuit adopts integrated chip, greatly strengthens antijamming capability.
the accompanying drawing explanation:
accompanying drawing 1 is the structural representation of this product.
accompanying drawing 2 is circuit block diagrams of this product.
accompanying drawing 3 be arranged on track, by the generalized section of the first form of implementation of wheel sensor of the present utility model.
accompanying drawing 4 be provided in a side of in orbit, with two sensors in order to the measuring vehicle Negotiation speed, by the generalized section of the second form of implementation of wheel sensor of the present utility model.
the specific embodiment:
embodiment 1:
a kind of wheel sensor, its composition comprises: electric vortex type contact pointless detecting sensor 1, quartz oscillator 5, power amplifier 6, radioamplifier 7, detecter 8, low frequency amplifier 9, Schmidt trigger 10 are arranged on the circuit card 3 of described electric vortex type contact pointless detecting sensor inside, the pig-tail wire of the inductance coil 2 of LC oscillator is welded on described circuit card, and described electric vortex type contact pointless detecting sensor is sealed in engineering plastics shell 4 by the embedding of antifreeze sealing extending agent.
embodiment 2:
according to the described wheel sensor of embodiment 1, the inductance coil of described LC oscillator is PCB
printed coil.
embodiment 3:
according to the described wheel sensor of embodiment 1, when electric vortex type contact pointless detecting sensor is supplied with power supply, the output signal of quartz oscillator makes the inductance coil of LC oscillator produce the alternating magnetic field of high frequency after being amplified by power amplifier, when the wheel of the guideway vehicle formed when ferromagnetic material enters in this alternating magnetic field, changed the equivalent inductance of inductance coil, causing the oscillation amplitude of LC oscillator to reduce is even zero, this changes by the radioamplifier of back, detecter, low frequency amplifier is sent into Schmidt trigger after processing, produce the on-off signal of vehicle process.After wheel leaves, the vibration of LC oscillator recovers.Can send accurately wheel when 0 ~ 360km/h by wheel sensor of the present utility model and pass through signal, this wheel sensor is simple in structure, highly sensitive, and adaptive capacity to environment, antijamming capability are strong, are applicable to the detection of guideway vehicle wheel, meter shaft, meter and vehicle Negotiation speed and measure.
embodiment 3:
accompanying drawing 3 is by wheel sensor of the present utility model, and section-drawing in orbit is set.During installation, should be arranged on the below of guideway vehicle wheel rim by wheel sensor of the present utility model, and as far as possible near wheel rim.
accompanying drawing 4 is, by wheel sensor of the present utility model, two section-drawings in orbit are set simultaneously.Two are arranged on track inboard by fixing apart from s by wheel sensor of the present utility model, when wheel is pressed wheel sensor of the present utility model through two successively, first is respectively t1, t2 with the moment that second sensor sent signal, by following formula, can calculate the wheel Negotiation speed:
V?=?(t2-t1)/s
two wheel sensores establishing in orbit by accompanying drawing 4 are to prevent from being subject to the variation that long-term vibrations cause s, two wheel sensores can be arranged on same wheel sensor carrier jointly, another kind of embodiment as this example, also can with antifreeze sealing extending agent, be sealed in two electric vortex type contact pointless detecting sensors in same engineering plastics shell, guarantee the constant distance of two sensors, also guaranteed the accuracy that the vehicle Negotiation speed is measured.
embodiment 4:
the principle of work of passive wheel sensor is electromagnetic induction principle, induction coil, on U-shaped permanent-magnet ferrite, consists of.In the induction coil magnetic field constant in permanent-magnet ferrite, when wheel, through out-of-date, the constant magnetic field of permanent-magnet ferrite, by disturbance, causes the magnetic flow of induction coil to change, produce induced electric motive force in coil, the mouth at induction coil forms voltage signal output.The induced signal of passive wheel sensor output depends on the speed that wheel passes through, the speed of passing through when wheel is during lower than 3km/h, the amplitude of the induced signal that the passive wheel sensor produces is very little, and signal receiving end can't extract the signal that wheel passes through from noise.And by wheel sensor of the present utility model generation high-frequency oscillation signal initiatively, when the wheel velocity passed through is very low, be even zero, be that wheel is while being parked in the top by wheel sensor of the present utility model, wheel is still to by the oscillator coil generation effect of wheel sensor of the present utility model, wheel sensor lasting output detections to the signal of wheel.Therefore adapt to the speed of a motor vehicle by wheel sensor of the present utility model and can be low to moderate zero.
Claims (2)
1. a wheel sensor, its composition comprises: electric vortex type contact pointless detecting sensor, it is characterized in that: it forms and also comprises quartz oscillator, power amplifier, radioamplifier, detecter, low frequency amplifier, Schmidt trigger is arranged on the circuit card of described electric vortex type contact pointless detecting sensor inside, the pig-tail wire of the inductance coil of LC oscillator is welded on described circuit card, and described electric vortex type contact pointless detecting sensor is sealed in the engineering plastics shell by the embedding of antifreeze sealing extending agent.
2. wheel sensor according to claim 1, it is characterized in that: the inductance coil of described LC oscillator is the PCB printed coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220403984 CN202686387U (en) | 2012-08-15 | 2012-08-15 | Wheel sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220403984 CN202686387U (en) | 2012-08-15 | 2012-08-15 | Wheel sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202686387U true CN202686387U (en) | 2013-01-23 |
Family
ID=47542045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220403984 Expired - Lifetime CN202686387U (en) | 2012-08-15 | 2012-08-15 | Wheel sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202686387U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103455687A (en) * | 2013-09-16 | 2013-12-18 | 哈尔滨工业大学 | Method for calculating the induced electromotive force of axle counting sensor |
-
2012
- 2012-08-15 CN CN 201220403984 patent/CN202686387U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103455687A (en) * | 2013-09-16 | 2013-12-18 | 哈尔滨工业大学 | Method for calculating the induced electromotive force of axle counting sensor |
| CN103455687B (en) * | 2013-09-16 | 2016-08-17 | 哈尔滨工业大学 | A kind of method for solving of axle count sensor induction electromotive force |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: The area of road and Weifang Road intersection haping road centralized development zone in Harbin City, Heilongjiang province 150060 Patentee after: Harbin Kejia General Mechanical & Electrical Co.,Ltd. Address before: The area of road and Weifang Road intersection haping road centralized development zone in Harbin City, Heilongjiang province 150060 Patentee before: HARBIN KEJIA GENERAL ELECTRO-MACHINE Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20130123 |
|
| CX01 | Expiry of patent term |