CN2257266Y - Locomotive speedometer - Google Patents

Abstract

The utility model relates to a locomotive speedometer which is characterized in that a magnetic-sensing type speed sensing device is used to replace an original speed indicating generator. The magnetic-sensing type speed sensing device specially suitable to be used for the speed measuring device of a diesel locomotive utilizes the rotation of wheels to drive a rotor 19 inserted with a permanent magnet to rotate, enabling electrical apparatus elements in a magnetic-sensing sensor 29 to generate pulse current. A pulse electric signal is transmitted to a speed recorder 33 in an operator cabin through a conducting wire and a microcomputer in the recorder 33 can calculate speedaccording to the pulse number in a unit interval and can directly display the instantaneous speed of the locomotive on a digital display. The utility model has the advantages of accurate and reliable speed measurement and no outside electromagnetic interference.

Description

A kind of locomotive speed measuring device

The utility model relates to the particularly speed measuring device of diesel locomotive of a kind of locomotive.

The existing speed measuring device of diesel locomotive is to drive the tachogenerator generating by axletree by mechanical transmission mechanism, electric current that sends and voltage signal pass to monitoring record in the driver driving chamber by lead, logger is according to the size of electric signal, method with simulation converts thereof into locomotive speed.This device is owing to adopt analog quantity, and is subjected to electromagnetic interference big, and the speed of a motor vehicle error ratio of measuring is bigger, and especially locomotive is when low speed and high speed, and it is inaccurate to test the speed.

The purpose of this utility model is to design the locomotive speed measuring device that a kind of quantity of locomotive speed signal is directly proportional with locomotive speed, and this device tests the speed accurately and reliably, is not subjected to the influence of speed of a motor vehicle height, also is not subjected to locomotive or surrounding environment electromagnetic interference.

The purpose of this utility model adopts following technical proposals to reach: replace the tachogenerator of now using in the speed measuring device with the Mageneto-sensitive type speed sensing device.

Newly-designed Mageneto-sensitive type speed sensor is to drive the rotor rotation that studs with permanent magnet by wheel revolutions, make the electric elements in the magneto-dependent sensor produce pulse current, this pulse electrical signal is passed to recording instrument in the driver's cab by lead, microcomputer in the recording instrument calculates the speed of a motor vehicle according to the pulse count in the unit time, and directly demonstrates the momentary velocity of locomotive on data display equipment.

Because the instantaneous locomotive speed that this speed measuring device shows is to show after calculating according to the pulse count that is directly proportional with locomotive speed, it is not subjected to the influence of the high and low pulse current size that causes of the speed of a motor vehicle, also be not subjected to the electromagnetic interference of surrounding environment and locomotive, the speed of measuring accurately and reliably.

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1: constructional drawing of the present utility model;

Fig. 2: Mageneto-sensitive type speed sensor circuit figure of the present utility model;

Fig. 3: the utility model embodiment scheme drawing.

The utility model is included in the insertion axle 10 that insert axletree end of locomotive, and it is linked together with Crux 14 and little axle 16.At rotor 19 of little axle 16 right-hand member suits, the two is fixedly connected with key 18, evenly is being bumped into several uniform garden cylindricality permanent magnets 23 week of rotor 19, and with catch 17 it is blocked.Insert right-hand member and the little axle 16 usefulness antifriction-bearing boxs 13 and 20 supportings of axle 10.Magneto-dependent sensor 29 is installed above fixing body 27; circuit card 30 is arranged in it, and the circuit of circuit card 30 is by low temperature monostable switch type Hall element CM (abbreviation hall device) and be connected in parallel in the power circuit stabilivolt W1, diode D1 that hall device is played overpressure protection and form.Hall device electromotive force end OC is connected with the terminal of the demonstration of the number in lead and driver's cab monitor 33.This hall device CM is a kind of later-model magneto-dependent sensor spare, under the condition of stable operating voltage, its generation show that suddenly electromotive force is only relevant with magnetic induction density basically, and both are linear proportional relation, whole magnetosensitive sensing device by the screw retention on interior seat 1 and the fixing body 27 on locomotive axle box end cap.Whole in addition magnetosensitive sensing device also can be installed on the original speed sensor support of locomotive: little axle 16 is connected with the insertion axle of original sensor by Crux 14, and several screw retention of fixing body 27 usefulness are on the original sensor support.When needing the monitoring machine vehicle speed, starting signal is adorned an electromagnetic inductor 34 in the middle of the circuit of outside certain distance as 500 meters distances two ground coils 35 to be set on the bogie truck of locomotive bottom AT STATION.Purpose is the check and correction wheel diameter.When first coil of locomotive process, electromagnetic inductor 34 receives 500 meters entry signals, and during through second coil, electromagnetic inductor 34 receives an outlet signal, this signal is passed to recording instrument 3 by lead, and the clock in the recording instrument 33 will provide pitch time.Microcomputer on the recording instrument calculates wheel diameter according to the revolution of 500 meters length and wheel, deposits in then in the computing machine, calculates for testing the speed and uses.

Locomotive is in operation, wheel constantly rotates, its permanent magnet 23 that is driving in the magnetosensitive sensing device constantly rotates, make the hall device CM generation pulse electrical signal off and in the circuit card 30 in the magneto-dependent sensor 29, this pulse electrical signal is passed to tachograph 33 by lead, microcomputer, clock and digital display device are arranged in the tachograph, 33 computing machine in the recording instrument, it is through calculating locomotive speed and demonstrate locomotive speed on nixie display.Wheel constantly rotates to drive and inserts axle 10 rotations, and it drives little axle 16 by Crux 14 and rotates, so rotor 19 and the permanent magnet in one week 23 rotate, locomotive speed is fast more, and the speed of rotor rotation is also fast more.Permanent magnet 23 is in rotation, the magnetic field that changes, make with it to keep the hall device CM on the magnetosensitive circuit card 30 in the magnetosensitive propagated sensation sensor 29 of certain interval to produce Hall voltage, this electromotive force passes to 33 li of recording instrument in the driver's cab by lead, produces the electric signal pulse in recording instrument.Each permanent magnet 23 through circuit card 30 once promptly produces an impulse singla, if 19 1 weeks of rotor are equipped with 20 permanent magnets, then wheel circles, and recording instrument just produces 20 impulse singlas for 33 li, if wheel changeed for two weeks, just produce 40 impulse singlas, the rest may be inferred.The size of impulse singla and the speed of a motor vehicle are irrelevant, and what of its quantity are directly proportional with the speed of a motor vehicle.Microcomputer in the recording instrument 33 is according to the time of calculagraph (little clock) record and the pulse count that produces therebetween, the wheel diameter that records when being the pulse count that obtains the unit time and departures calculates the momentary velocity of locomotive, instruct its nixie display numeric display that glistens simultaneously, the driver can observe locomotive speed at any time.

As: 20 permanent magnets are arranged on the rotor, the actual wheel diameter of measuring is 840mm, if within 1 minute, receive 20000 impulse singlas in the recording instrument, be that wheel changeed 1000 commentaries on classics in 1 minute, it is 39.6 kilometers/hour that COMPUTER CALCULATION goes out the speed of a motor vehicle, at this moment near " 40 " on the nixie display, the i.e. point of corresponding " 39.6 " flash of light is so the driver can know that the speed of a motor vehicle of this moment is 39.6 kilometers/hour.If the speed of a motor vehicle improves constantly shining point and moves along cw; Otherwise shining point moves along conter clockwise.

The utility model tests the speed accurately and reliably, and it is also irrelevant with speed of a motor vehicle size in service not disturbed by environment electromagnetics.Applied widely: the locomotive of original dress speed measuring motor is applicable, can be installed on the locomotive that speed measuring device was arranged originally; Also can be contained on the locomotive that does not have speed measuring device; Can be installed on diesel locomotive and electric locomotive or other locomotive.

Claims (3)

1, a kind of locomotive speed measuring device, comprise interior seat (1), fixing body (27), two ground coils (35), measuring wheel footpath inductor (34) one a cover Mageneto-sensitive type speed transmission rod (29) and monitoring record display instruments (33), it is characterized in that: two coils (35) are contained in the middle of the circuit of station starting signal with outside certain distance; There is Mageneto-sensitive type speed sensor (29) fixing body (27) top, its by the screw retention on interior (1) and the fixing body on locomotive axle box end cap; Magnetosensitive speed sensor (29) is inserted in the end of motorcycle axle by the insertion axle (10) that is linked together with Crux (14) and little axle (16); , be bumped into several uniform cylindricality permanent magnets (23) week of rotor (19), and it blocked by key (a 18) rotor of suit (19) at little axle (16) right-hand member with catch (17); The right-hand member and the little axle (16) that insert axle (10) support with antifriction-bearing box (13), (20); Circuit card (30) in the magnetosensitive speed sensor (29) is connected by the terminal of drawing the interior tachograph (33) of the outer lead of sensor (29) and driver's cab.

2, locomotive speed measuring device as claimed in claim 1, it is characterized in that magneto-dependent sensor circuit card (30) is by low temperature monostable switch type Hall element (CM) be connected in parallel in the power circuit, hall device is played the stabilivolt (W1) of overpressure protection, and diode (D1) is formed; Hall device electromotive force mouth (OC) is communicated with the terminal of the demonstration monitor of the number in lead and the driver's cab (33).

3, locomotive speed measuring device as claimed in claim 1 is characterized in that tachograph (33) comprises that has the small-size computer that can go out locomotive speed according to impulse singla and Time Calculation; A chronograph and a digital flash of light telltale.

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