CN100437037C - Photoelectric speed monitoring method and device for train with magnetic transmission - Google Patents
Photoelectric speed monitoring method and device for train with magnetic transmission Download PDFInfo
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- CN100437037C CN100437037C CNB200610031336XA CN200610031336A CN100437037C CN 100437037 C CN100437037 C CN 100437037C CN B200610031336X A CNB200610031336X A CN B200610031336XA CN 200610031336 A CN200610031336 A CN 200610031336A CN 100437037 C CN100437037 C CN 100437037C
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Abstract
The present invention relates to a method and a device for monitoring the photoelectric speed of a magnetic driving train. The method and the device enable a train monitoring data collecting sensor and a data transferring shaft to realize non-contact type transmission through magnetic force by adopting a non-contact type driving mechanism and utilizing a magnetic driving principle, and the data collection of the sensor is collected through magnetic force non-contact type transmission. The method has the particular mode that a magnetic force driving mechanism is arranged between a train monitoring data generator and a data collecting device of the sensor to enable train monitoring data to be transferred to the data collecting device of the sensor through the magnetic force driving mechanism. The data collecting device of the sensor is a grating pulse mechanism which adopts more than two light sources (luminous diodes) to make a grating disc converted into intermittent light through the magnetic force driving mechanism between an axle and an axle box for switching on or off a photodiode in a light chopper, and two paths of pulses are converted into four paths (or more paths) of pulses by an intelligent integrated chip (IC) and then are output through a CAN bus line.
Description
Technical field
The invention belongs to a kind of train operation monitoring data collecting methods, refer in particular to a kind of acquisition method of train speed Monitoring Data; The invention still further relates to a kind of device of said method.Be mainly used in directly and provide signal accurately to the train operation monitoring device.Can be used for gathering signals such as various train speeds, location from axle.
Background technology
Train speed sensor is the vitals of safe train operation control device.Be mainly used in directly and provide rate signal accurately, pass through Cha Qu with the top speed that is higher than the track switch permission to prevent train to the train operation monitoring device; With the top speed operation that prevents that train from allowing to be higher than the running section circuit; To prevent to be higher than the top speed operation of locomotive, car construction permission; Preventing under specific condition, to be higher than the speed bootup window of regulation, as: shunting service, train fall to slip and in the interval of automatically closing up, when closing ground signal etc. under the situation; When train speed surpasses the permissible value of afore mentioned rules, send alarm and service braking or brake hard instruction, so speed pickup also is one of vitals of safe train operation equipment.
For many years, a large amount of research and improvement have been done to train speed sensor by railway related scientific research department and enterprise.That adopts at present has a light electricity velocity sensor (other magnetoelectricity speed pickup, magneto speed pickup owing to reasons such as its reliability, accuracy have been eliminated, no longer narration after this) of four types, can exchange use.State-of-the art have two kinds, i.e. TQG9 type and TQG15 type light electricity velocity sensor.These several speed pickups are basic identical on principle, structure, and existing is example with TQG9 type locomotive speed pickup just, sets forth the basic fundamental overview of present train speed sensor.
The ultimate principle of TQG9 type locomotive speed pickup is to become uniform intermittent light with a light source (light emitting diode) via the grating dish that rotates with wheel, cause the photodiode break-make operation in the optical chopper, after the amplification shaping of circuit, output and the proportional square-wave pulse sequence of rotating speed.Its profile as shown in Figure 1.TQG9 type locomotive speed pickup is made up of supporting construction, rotating shaft and universal joint shaft mechanism and photoelectric switching circuit system three parts.The grating dish is fixed on rotating shaft shaft extension end, and rotating shaft is supported on the base by bearing (2 * 46204), and lithium base (trade mark 4) railway grease is adopted in bearing lubrication.By grating shaft extension end, rotating part adopts machinery labyrinth seal structure anyhow; Stationary part adopts plastic fluid sealant sealing; Rotating shaft is the single tine joint of universal coupling, universal shaft is provided with 8 needle bearings altogether, guarantee the dirigibility of rotation, universal coupling output terminal mechanical interface is band elasticity side tenon universal coupling 1, and its square cross-section size is scalable: 18mm * 18mm～20mm * 20mm.Photosensitive probe is placed in grating dish both sides, and is installed on the base 2, and cable pigtail is fixed on the base and with the oil resistant rubber pipe and protects, and pillar and base adopt the sealing of punching press banding cap.Electric interfaces has adopted JL5 type locomotive electric connector, cable length 1.3m.It is locomotive axle box enclosing cover tapping that sensor 3 is installed on the mount pad.Bore size: location garden ￠ 65
+ 0.1 + 0.29Mm, it is uniform on ￠ 130 ± 0.2 circumference that screw 4-M8 is installed; Square hole seat square hole size 19 * 19
+ 0 + 0.5Mm; Universal coupling output resilient tongue inserts in the wheel square hole seat, and mounting structure as shown in Figure 2.During installation, evenly be coated with skim railway grease, slide flexibly to guarantee elasticity side's tenon four slide plates and square hole seat wall at wheel hub 4 axle head square hole walls.But existing photoelectric sensor remains in some shortcomings.Its universal joint shaft gear train of four types photoelectric sensor, the photoelectric switching circuit system that adopts is basic identical at present, and these two parts also are the cores of photoelectric sensor.This two-part reliability, the technical quality that determines sensor performance.Problem from four aspects below the photoelectric sensor ubiquity of four types of present utilization effects:
1. mechanical fault is more
This class photoelectric sensor adopts the universal joint shaft gear train, and its universal coupling output elasticity side tenon (scalable 18mm * 18mm～20mm * (19mm * 19mm) rotate 20mm) to insert wheel square hole seat by middle the connection.(wheel weight is 2.065～2.846 tons because wheel inertia is big; Wheel bears 21～25 tons of static loads; The deadweight amount is q=4.61～6.12 ton under the spring), when wheel during to high speed rotating with by situations such as curves, track switch, rail gap, (maximum amount of movement is 30mm) takes place laterally to move to meeting in wheel, when diameter run-out, impact of collision, easily cause mechanical parts such as band elasticity side tenon universal coupling, spring bearing, rotating shaft to be damaged, also can cause simultaneously the wearing and tearing of axle box enclosing cover 5, especially under the relatively poor situation of line condition, failure rate of machinery can rise significantly.Generally, also to strengthen the inspection of elasticity side's tenon and the railway grease of interpolation insertion portion, otherwise also can increase failure rate of machinery.Adopt this universal connection gear train will inevitably cause sensor generation mechanical fault even damage (sensor is difficult to bear the right impact inertia of wheel) in a word.
2. light source is seriously polluted
This class photoelectric sensor is to become intermittent light with the grating dish of a light source through rotating with wheel shaft, owing to be universal coupling, the direct and axletree box cavity UNICOM of this gear train structurally can't realize whole sealing status, the pollution of grating dish can make the light signal distortion, produces mutually and pollutes.The light slot number that at first is 0.2mm is vulnerable to pollute, and secondly is that the grating dish also is vulnerable to pollute.
3. the output waveform degree of distortion is big
The photoelectric switching circuit system is by the operation of the photodiode break-make in the light isolating switch, after the amplification shaping of circuit, and output and the proportional square-wave pulse sequence of rotating speed.Because the machining precision of grating dish, rotating shaft causes the square-wave pulse distortion, therefore in amplification and rectification circuit, adopt potentiometer or variable resistor to adjust, its precision is difficult to guarantee.
4. function expansibility is poor
The one, adopt universal link gear to be difficult to satisfy the requirement of train speed raising, itself easily causes mechanical fault this structure, when maximum speed is 1000r/min, train speed is 198～235km/h, when train speed reaches the 300km/h left and right sides, sensor rotation speed is 1300～1500r/min, and this moment is higher to the requirement of gear train, and this sensor is difficult to meet the demands.
The 2nd, rate signal is that safe train operation, Properties Control adopt one of signal the most widely, and the output of multiplex pulse signal should be arranged, and is subjected to original structure and circuit limitations output four road pulse signals at most, and is bigger as spreading difficulty.
By foregoing description, can learn that existing speed pickup remains in some shortcomings, therefore necessary this is improved.
Summary of the invention
The objective of the invention is to the deficiency at the collecting method of existing photoelectric sensor, it is few to propose a kind of mechanical fault, and light source pollutes the acquisition method of light new type train Monitoring Data, especially a kind of acquisition method of train speed Monitoring Data.
Another object of the present invention is to provide a kind of collection of train Monitoring Data of said method.Especially a kind of picking rate of train speed Monitoring Data.
According to the technology implementation scheme that purpose of the present invention proposed be: adopt the photoelectric speed sensing technology to gather the train speed signal, and rate signal collects from train axle, the rate signal collection that is characterized in speed probe is by contactless gear train, utilize the magnetic transmission principle, make sensor data acquisition device and data transfer device realize and the contactless transmission of axletree that by magnetic force the speed probe data acquisition collects by axletree by the contactless gear train of magnetic force.Its concrete mode is between axletree and sensor data acquisition device a magnetic driving mechanism to be set, make the train Monitoring Data be delivered to the sensor data acquisition device by magnetic driving mechanism, the sensor data acquisition device is the grating pulse mechanism, adopt two above light sources (light emitting diode), magnetic driving mechanism through between axletree (as axletree) and sensor data acquisition device makes the grating dish become intermittent light, cause the photodiode break-make operation in the optical chopper, is four tunnel (or multichannel) pulse through intelligent integrated chip (IC) with the two-way impulse transfer, exports through the CAN bus again.Can solve the universal joint shaft gear train like this and cause the frequent drawback of failure rate of machinery, contactless gear train is not taken turns the impact to huge inertia, and the rotating shaft load is less, and failure rate of machinery is almost nil, and makes and increase substantially sensor rotation speed and become possibility.Its reliability will increase substantially.According to the device that said method provided be: comprise axletree and sensor data acquisition device, between axletree and sensor data acquisition device, a magnetic driving mechanism is set.Wherein, magnetic driving mechanism mainly is divided into the two big class kinds of drive, the one, magnetic force coupling manner, the 2nd, magnetically-actuated mode.These two kinds of kinds of drive all make axletree and sensor be in contactless state, and the huge inertia of axletree can't be delivered on the sensor like this, and the load of sensor rotating part is minimum, and mechanical fault is almost nil.Under the advance that keeps new product, technical prerequisite, can satisfy versatility, the interchangeability of existing product again, the external interface of magnetic gear train and all speed probe external tappings are consistent.Simultaneously, because adopt contactless gear train, Sensor section can seal fully, so adopt all-sealed structure for the Monitoring Data harvester, the pollution source of axle box inner chamber still are that sensor internal all can't be invaded in the outside contamination source, have overcome the difficult problem that light source pollutes.In addition, also adopt intelligent integrated chip and fieldbus (CAN) output, efficiently solve square-wave pulse degree of distortion and the limited difficulty of pulse output channel.
The present invention adopts magnetic driving mechanism, efficiently solves the frequent mechanical fault that takes place of existing sensor, simultaneously owing to adopted enclosed construction, has avoided difficult problems such as light source is seriously polluted effectively.The magnetic drives technology is used on the railway mobile device first, is a creationary invention, and it will exert far reaching influence in the every field of railway, also will provide strong technical support for the high-speed railway of fast development.
Description of drawings
Fig. 1 has TQG9 type locomotive axle head light electricity velocity sensor synoptic diagram now;
Fig. 2 has TQG9 type locomotive axle head light electricity velocity sensor mounting structure figure now;
Fig. 3 magnetic coupling schematic diagram;
Fig. 4 directly drives synoptic diagram;
Fig. 5 speed probe intelligent object circuit theory diagrams;
Fig. 6 magnetic coupling kind of drive embodiment.
Among the figure: 1, band elasticity side tenon universal coupling; 2, base; 3, sensor; 4, wheel shaft; 5, axle box enclosing cover; 6, axletree; 7, sensor data acquisition device; 8, magnetic driving mechanism; 9, axle box end; 10, speed probe; 11, axletree end; 12, sensor data acquisition device; 13, magnetic gear train; 14, big magnet assembling (axletree end magnet); 15, small magnet assembling (sensor ends magnet); 16, magnet holder; 17, sensor ends magnet transmission shaft; 18, grating dish; 19, bearing; 20, sensor housing; 21, module; 22, integrated chip; 23, outer cover; 24, dust cover.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
From accompanying drawing as can be seen, the present invention is a kind of harvester of train speed Monitoring Data, adopt the photoelectric speed sensing technology to gather the train speed signal, and rate signal collects from train axle, it is characterized in that: the rate signal collection of speed probe is by contactless gear train, utilize the magnetic transmission principle, make sensor data acquisition device and data transfer device realize and the contactless transmission of axletree that by magnetic force the speed probe data acquisition collects by axletree by the contactless gear train of magnetic force.Its concrete mode is that a magnetic driving mechanism 8 is set between axletree 6 and sensor data acquisition device 7, make the train Monitoring Data be delivered to sensor data acquisition device 7 by magnetic driving mechanism 8, magnetic driving mechanism 8 mainly is divided into the two big class kinds of drive, the one, magnetic force coupling scheme, the 2nd, magnetically-actuated mode.It is the grating pulse mechanism that these two kinds of kinds of drive all make wheel shaft and sensor be in contactless state sensor data acquisition device 7, adopt two above light sources (light emitting diode), magnetic driving mechanism 8 between axletree 6 and sensor data acquisition device 7 makes the grating dish become intermittent light, cause the operation of the photodiode break-make in the optical chopper in the revolution speed sensing 10, is four tunnel (or multichannel) pulse through intelligent integrated chip (IC) with the two-way impulse transfer, exports through the CAN bus again.Can solve the universal joint shaft gear train like this and cause the frequent drawback of failure rate of machinery, contactless gear train is not taken turns the impact to huge inertia, and the rotating shaft load is less, and failure rate of machinery is almost nil, and makes and increase substantially sensor rotation speed and become possibility.According to the device that said method provided be: comprise axletree 6 and sensor data acquisition device 7, and sensor data acquisition device (7) is the grating pulse mechanism, the force transmission mechanism between axletree 6 and the sensor data acquisition device 7 is a magnetic driving mechanism 8.Wherein, described magnetic driving mechanism 8 is magnetic force coupling device or magnetic driving equipment.Under the advance that keeps new product, technical prerequisite, can satisfy versatility, the interchangeability of existing product again, the external interface of magnetic gear train and all speed probe external tappings are consistent.Simultaneously, owing to adopt contactless gear train, speed probe 10 still is sleeved on the axle box end 9, but Sensor section can seal fully, so adopt all-sealed structure for the Monitoring Data harvester, the pollution source of axle box inner chamber still are that sensor internal all can't be invaded in the outside contamination source, have overcome the difficult problem that light source pollutes.In addition, also adopt intelligent integrated chip and fieldbus (CAN) output, efficiently solve square-wave pulse degree of distortion and the limited difficulty of pulse output channel.
Major technique condition and parameter
All technical conditions satisfy the correlated condition of TB and are better than every technical parameter of original sensor, and wherein the measurement of rotating speed scope can reach 0～3000r/min (former index is 0～1000y/min).
Embodiment one
Adopt the magnetic force coupling scheme
With novel permanent magnetic material (Nd-Fe-B) according to 4,6,8,12,16 ... number of pole-pairs form magnetic coupling, as shown in Figure 3.Big end magnetosheath is installed in wheel to last, and small end magnetic force axle connects with sensor axis, and when wheel rotated, under the effect of magnetic torsion, the driving sensor axle rotated synchronously.Major technique condition axletree and sensor rotating shaft nonconcentricity≤6mm, the free laterally amount of movement＞30mm of wheel shaft.
Embodiment two
Adopt the magnetically-actuated mode
With permanent magnetic material (Nd-Fe-B) directly drive (as shown in Figure 4) face-to-face according to 2,4 numbers of pole-pairs.The magnetic pole logarithm that is installed in axle end equates with the magnetic pole logarithm that is installed in the sensor axle head, when wheel shaft rotates, under the effect of magnetic pull, drives the rotating shaft rotation of sensor side.The major technique condition: aspectant magnetic distance is: 10～80mm; Nonconcentricity≤the 6mm of diaxon.
Specific embodiment one
Fig. 6 has provided a kind of specific embodiment of the magnetic coupling kind of drive, and the speed pickup monitoring system of present embodiment mainly is made up of axletree end 11, sensor data acquisition device 12, magnetic gear train 13 3 parts as can be seen from accompanying drawing.Magnetic gear train 13 comprises big magnet assembling (axletree end magnet) 14 and small magnet assembling (sensor ends magnet) 15, and wherein big magnet assembling 14 is installed in the magnet holder 16 that has square shaft, in the square hole of square shaft insertion axletree end and by the swelling of swelling mode.Small magnet assembling 15 is installed on the sensor ends magnet transmission shaft 17, and magnet transmission shaft 17 other ends are installed grating dish 18, and magnet transmission shaft 17 is supported in the sensor housing 20 by bearing 19; In the sensor housing 20 is closed cavity, and the dust cover 24 that plays the seam effect is sealed in housing 20 left ends with small magnet assembling 15 and magnet transmission shaft 17.Housing 20 is useful on the outer cover 23 of closed cavity, and closed cavity is combined to form with sensor housing 20 by dust cover 24, outer cover 23.Also be provided with grating dish 18, module 21 and integrated chip 22 at sensor housing 20, outer cover 23 is sealed in grating dish 18, module 21 and integrated chip 22 right-hand member of sensor housing 20.Axletree end 11 is realized contactless transmission with sensor data acquisition device 12 by magnetic driving mechanism 13, and by two (or a plurality of) light sources (light emitting diode), magnetic driving mechanism through between axletree and sensor makes the grating dish become intermittent light, cause the photodiode break-make operation in the optical chopper, is four tunnel (or multichannel) pulse through intelligent integrated chip (IC) with the two-way impulse transfer, exports through the CAN bus again.When axletree rotates, drive big magnet assembling 14 and rotate; Because the magnetic force coupling between large and small magnet makes small magnet rotate synchronously with big magnet, causes magnet transmission shaft 17, grating dish 18 to do non-contacting rotation together.Because large and small magnet is axially having enough magnet amounts of lap all the time, so the magnetic force coupling of big small magnet exists all the time and large and small magnet rotates all the time synchronously.Big magnet assembling is 24-26mm with the axial effective clearance design load of sensor housing, the axial effective clearance design load of big magnet assembling and small magnet assembling be 24-26mm (the maximum transverse momentum of considering locomotive wheel pair and axle box for ± 15mm) (end distance axle head 70 ± 5mm) outside the axle box cover, radially radial design value in effective clearance is 5-8mm; Guaranteed that axle head running part and sensor ends running part are always contactless state.General assembly (GA) is except that big magnet cartridge is equipped with, sensor is sealed into one fully, housing 20 inside are isolated from the outside fully, and small magnet assembling 15, magnet transmission shaft 17, bearing 19, grating dish 18, module 21 and sensor housing 20 inside are not subjected to the interference of extraneous rainwater, dust etc.Integrated chip 22 is installed in outer cover 23 inside, and the circuit output interface is consistent with the original sensor interface.This sensor adopts the intelligent object Circuits System as data transmission device, and concrete structure is as follows:
(1) ultimate principle
Intelligent object through conversion, forms 4 drive tests speed square-wave pulse, with fieldbus (CAN) output with the irregular rect.p. of two-way mutual deviation 900 electrical angles of pulse generating portion generation.Directly export numerical value, the travel direction of travelling speed and monitor the operation or the malfunction of this sensor with the mode of serial communication, have very strong intelligent functions.
(2) basic circuit
The circuit of sensor intelligent module is (Fig. 5) as shown in the figure.Intelligence integrated chip (IC) SPMC75 be input as two-way pulse pusle_in1, pusle_in2 and ± the 15V power supply, the two-way pulse is that 4 tunnel pulse pusle_out1 export through the signal of communication of CAN bus to pusle_out4 through intelligent integrated chip (IC) operation transform.Adopt intelligent integrated chip and fieldbus (CAN) export technique, make that the irregular rect.p. of mutual deviation 900 electrical angles is more simple on adjusting, more accurate on precision.Output channel has also had expansion greatly.
Claims (6)
1, train with magnetic transmission photoelectric speed monitoring method, adopt the photoelectric speed sensing technology to gather the train speed signal, and rate signal collects from axletree, it is characterized in that: the rate signal collection of speed probe is by contactless gear train, utilize the magnetic transmission principle, make the sensor data acquisition device realize and the contactless transmission of axletree that by magnetic force the speed probe data acquisition utilizes the contactless gear train of magnetic force to collect by axletree; Between axletree and sensor data acquisition device, a magnetic driving mechanism is set, make the train Monitoring Data be delivered to the sensor data acquisition device by magnetic driving mechanism, the sensor data acquisition device is the grating pulse mechanism, adopt two above light sources, magnetic driving mechanism between axletree and sensor data acquisition device makes the grating dish become intermittent light, cause the operation of the photodiode break-make in the optical chopper in the speed probe, is four the road or multiplex pulse through intelligent integrated chip with the two-way impulse transfer, exports through the CAN bus again.
2, train with magnetic transmission photoelectric speed monitoring method as claimed in claim 1 is characterized in that: described magnetic driving mechanism is magnetic force coupling scheme or magnetically-actuated mode, and these two kinds of kinds of drive all make wheel shaft and sensor be in contactless state.
3, a kind of train with magnetic transmission photoelectric speed monitoring device, comprise axletree (6) and sensor data acquisition device (7), and sensor data acquisition device (7) is the grating pulse mechanism, it is characterized in that: be provided with magnetic driving mechanism (8) between axletree (6) and the sensor data acquisition device (7); Be the contactless transmission of magnetic drives between axletree (6) and the sensor data acquisition device (7), and by two or more light sources, described magnetic driving mechanism (8) makes the grating dish become intermittent light through between axletree (6) and sensor data acquisition device (7), cause the photodiode break-make operation in the interior optical chopper of speed probe (10), is four the road or multiplex pulse through intelligent integrated chip with the two-way impulse transfer, exports through the CAN bus again.
4, train with magnetic transmission photoelectric speed monitoring device as claimed in claim 3 is characterized in that: described magnetic driving mechanism (8) is magnetic force coupling device or magnetic driving equipment.
5, train with magnetic transmission photoelectric speed monitoring device as claimed in claim 3, it is characterized in that: described magnetic driving mechanism (8) is the magnetic force coupling device, with permanent magnetic material according to 4,6,8,12,16 ... number of pole-pairs form magnetic coupling, big end magnetosheath is installed in wheel to last, small end magnetic force axle connects with the sensor rotating shaft, axletree and sensor rotating shaft nonconcentricity≤6mm, the free laterally amount of movement＞30mm of wheel shaft.
6, train with magnetic transmission photoelectric speed monitoring device as claimed in claim 3, it is characterized in that: described magnetic driving mechanism (8) is a magnetic driving equipment, directly drive face-to-face according to 2,4 numbers of pole-pairs with permanent magnetic material, the magnetic pole logarithm that is installed in axle end equates the major technique condition with the magnetic pole logarithm that is installed in sensor rotating shaft end: aspectant magnetic distance is: 10～80mm; Nonconcentricity≤the 6mm of diaxon.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610031336XA CN100437037C (en) | 2006-03-13 | 2006-03-13 | Photoelectric speed monitoring method and device for train with magnetic transmission |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610031336XA CN100437037C (en) | 2006-03-13 | 2006-03-13 | Photoelectric speed monitoring method and device for train with magnetic transmission |
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| CN1818568A CN1818568A (en) | 2006-08-16 |
| CN100437037C true CN100437037C (en) | 2008-11-26 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102009020428A1 (en) * | 2008-11-19 | 2010-05-20 | Eureka Navigation Solutions Ag | Device and method for a rail vehicle |
| CN102004169B (en) * | 2010-09-10 | 2012-01-25 | 浙江大学 | Off-pulse fault diagnosing and velocity reading correcting method for photoelectric speed sensor of train |
Citations (6)
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|---|---|---|---|---|
| US4186609A (en) * | 1977-03-04 | 1980-02-05 | Max Baermann | Eddy-current device for measuring rotational speed |
| DE3114569A1 (en) * | 1981-04-10 | 1982-11-11 | Vdo Adolf Schindling Ag, 6000 Frankfurt | Speed indicator |
| CN87213074U (en) * | 1987-09-07 | 1988-06-15 | 张恩 | Speed sensor |
| DE19845644A1 (en) * | 1998-10-05 | 2000-04-06 | Grosch Ingrid | Contactless device for simultaneously measuring torque, rotation speed and rotary power of power transmission shaft; measures angle between position markers on torsion member |
| CN1075632C (en) * | 1996-08-06 | 2001-11-28 | 李扬荣 | Speed odometer with synchronous digital speed display and analogue speed pointer |
| CN2906557Y (en) * | 2006-05-22 | 2007-05-30 | 株洲天利铁路机车车辆配件有限公司 | Contact-less photoelectric train speed sensor |
-
2006
- 2006-03-13 CN CNB200610031336XA patent/CN100437037C/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4186609A (en) * | 1977-03-04 | 1980-02-05 | Max Baermann | Eddy-current device for measuring rotational speed |
| DE3114569A1 (en) * | 1981-04-10 | 1982-11-11 | Vdo Adolf Schindling Ag, 6000 Frankfurt | Speed indicator |
| CN87213074U (en) * | 1987-09-07 | 1988-06-15 | 张恩 | Speed sensor |
| CN1075632C (en) * | 1996-08-06 | 2001-11-28 | 李扬荣 | Speed odometer with synchronous digital speed display and analogue speed pointer |
| DE19845644A1 (en) * | 1998-10-05 | 2000-04-06 | Grosch Ingrid | Contactless device for simultaneously measuring torque, rotation speed and rotary power of power transmission shaft; measures angle between position markers on torsion member |
| CN2906557Y (en) * | 2006-05-22 | 2007-05-30 | 株洲天利铁路机车车辆配件有限公司 | Contact-less photoelectric train speed sensor |
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