CN2206800Y

CN2206800Y - Electric circuit trouble checking instrument for rail

Info

Publication number: CN2206800Y
Application number: CN 94229305
Authority: CN
Inventors: 张大立
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-08-10
Filing date: 1994-08-10
Publication date: 1995-09-06
Anticipated expiration: 2004-08-10

Abstract

The utility model relates to a circuit failure checking instrument for rails, which comprises a casing with an ammeter and a control switch, and control element assembled in the casing, wherein a sliver-shaped silicon steel piece whose length direction is parallel with the width direction of the casing is arranged in the casing which is forwards arranged on the upper surface of a rail; induction coils which are assembled on the silicon steel piece are respectively connected with each range contact in a detection circuit and an amplification rectification circuit through the control switch. The utility model has the advantages of compact structure, small size, light weight, portability, easy operation, high sensitivity and strong interference resistance. The utility model can obviously improve the work efficiency of failure detection and maintenance.

Description

Electric circuit trouble checking instrument for rail

The utility model relates to the pocket checking instrument that a kind of railway electrical personnel break down and check the track circuit that transmits ac signal.

Along with the development of modernized railway transportation, electric automatization is deep into each link of railway transportation.In the automatically closing up of rail track, rely on track to transmit ac signal, the control of finishing red, green, yellow lamp by control circuit shows.In long-term use,, multiple reason produces faults such as short circuit or open circuit owing to causing track circuit.Require electric affair personnel to judge that quick and precisely the trouble point in time gets rid of when breaking down.To guarantee that railway locomotive, vehicle safety move on schedule.At present, the on-the-spot detector that uses is shown in Fig. 6,7.Two kinds of detectors are identical on principle, all make big iron core with silicon steel sheet, winding around on it.When track was connected with ac signal, the magnetic field of its generation produced ac signal by iron core in coil, through diode rectification, was indicated by meter pointer.Because the rail size is big, in addition a little less than the ac signal, so must adopt bigger silicon steel sheet and coil.Therefore, this instrument volume is big, and weight is big, and is not portable, and its cost is also high.Directly adopt diode rectification to have the dead band, resolution ratio was low when signal was weak.High pressure, big current interference source are arranged on the line track both sides that electric locomotive is arranged.There is high-voltage fence the track top, and its alternating current direction is parallel with the track circuit sense of current, has a strong impact on measurement result.Because of limit by structure, can only on rail, measure electric current, for suspicious electric leakages place such as insulated gage rod between rail, can not measure easily, increased the difficulty of searching fault.

The purpose of this utility model provides a kind of track circuit failure checking instrument, and its compact conformation, volume are little, in light weight, is easy to carry, easily operation.It is highly sensitive, and strong interference immunity can significantly improve the operating efficiency of checking fault and maintenance.

The purpose of this utility model is achieved in that

This device comprises the housing that has ammeter and gauge tap and assembles its interior control element, wherein forward place in the housing of track upper surface, the length direction strip silicon steel sheet parallel with the housing width is installed, be assembled on the silicon steel sheet induction coil by gauge tap respectively with testing circuit in each range contact join and with amplify rectification circuit and join.

Because the utility model adopts the induction coil that is assembled on the strip silicon steel sheet, and by gauge tap respectively with have different ranges contact testing circuit and the amplification rectification circuit formed by transport and placing device and join, institute is so that its compact conformation, compared with prior art, improving sensitivity simultaneously, have strong interference free performance, volume obviously reduces, in light weight, be easy to carry, operation easily.To search fault accurate rapidly because of it, checks fault and the operating efficiency of keeping in repair so can obviously improve.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is a kind of concrete structure schematic diagram of the present utility model.

Fig. 2 is the right view of Fig. 1.

Fig. 3 is the structural representation that Fig. 2 lays down cap.

Fig. 4 is the utility model electrical schematic diagram.

Fig. 5 is the utility model user mode schematic diagram.

Fig. 6-the 7th, prior art constructions and user mode schematic diagram.

Describe concrete structure of the present utility model in detail according to Fig. 1-7.This device comprises induction coil 1,2, ammeter 3, range selector 4, cap 5, be equipped with portable with 9 housing 6, battery 7, functional switch 8, wiring board 10 parts such as grade.Wherein range selector 4, functional switch 8, and ammeter 3 all is packed on the cap 5.Be assembled with induction coil 1,2 in the strip housing 6, battery 7 and electronic element circuit plate 10.Induction coil can be provided with the identical coil 1,2 of two series connection reversal connections parallel to each other as required, also a coil 1 can only be set.Induction coil the 1, the 2nd utilizes enamel-covered wire to be wrapped in to form on the strip silicon steel sheet.The length direction of strip silicon steel sheet and housing 6 widths be arranged in parallel, promptly when housing 6 length directions when orbital direction is placed on track upper surface, the length direction of strip silicon steel sheet and track transverse cross-section parallel.The setting of induction coil 1,2 shown in Figure 1 is the rail tracks that are used for the electric locomotive track circuit or strong interferers is arranged.For non-electricity locomotive circuit and the not strong rail track of interference, can only get final product with induction coil 1.Since can not be identical when induction coil 1,2 is made, between two coil B1, B2, potentiometer W1 is set, as shown in Figure 4, so that adjust.During installation, two coils are in the same uniform unstable magnetic field, adjust W1 and make instrument be designated as zero.When single induction coil 1 is set without potentiometer W1.Induction coil 1,2(or single induction coil 1) by gauge tap respectively with testing circuit in each range contact join, the amplification rectification circuit of forming with operational amplifier a, b joins.Range selector 4 in the gauge tap is provided with K1, K2 two parts.K1 connects the contact of measuring 1.5A, 3A, three range electric currents of 9A respectively, to satisfy the needs of measuring different value electric currents.K2 is a power switch.When range changeover switch 4 was in the off-position, K2 cut off the electricity supply, and this device quits work.When switch 4 was in each range position, K2 kept power connection.Functional switch 8 in the gauge tap has two positions of e, f.One group of contact is connected power supply when switch 8 is in the e position, another group contact is delivered to ammeter 3 with the battery voltage signal that R14, R15 dividing potential drop obtain through W3, measure the voltage of battery 7, resistance R 12, R13 two ends tap battery 7 both positive and negative polarities, the center connects public ground, for operational amplifier provides corresponding dc source.When the voltage of ammeter 3 pilot cells 7 is low to setting value, during cisco unity malfunction, should in time change battery.When switch was in the f position, this device was in the measurement state, the current signal of operational amplifier output is delivered to ammeter 3 show.Potentiometer W4 is used to adjust sensitivity and increases damping.

During use, housing 6 length directions of this device are forward placed track upper surface, as shown in Figure 5, can measure the operating current of track circuit, judge therefrom whether track circuit has fault and fault type.Now be combined in the electric locomotive track circuit or the course of work of this device is arranged under the rail track operating mode of strong interferers.The identical induction coil 1,2 of two series connection reversal connections parallel to each other that are provided with in the housing 6, its spacing is from being about 20-30mm, interference source for circuit both sides or railway top, because of the distance far relatively, can think approx that this two coil experiences identical alternating magnetic field, produce the ac signal that the frequency equal phase is identical, amplitude equates.Because coil 1,2 anti-phase serial connections are cancelled out each other, externally there is not AC signal output, discharge external interference.At this moment, be close to rail level because of housing 6, the alternating current that makes track circuit in the magnetic field of coil 1 impression apparently higher than the magnetic field of coil 2 impressions, so the ac signal that coil 1 produces will be greater than the ac signal of coil 2 generations.As shown in Figure 4, ac signal that coil B1, B2 induce stack back output, through R1, R2, R3 dividing potential drop, K1 and C1 by switch 4 deliver to the amplification rectification circuit.This circuit is by operational amplifier a and resistance R 4-R11, capacitor C 2-C6, and diode D1-D5, potentiometer W2 forms.Wherein D1, D2 are used for limited amplitude protection, and C5 is charge and discharge capacitance and has every the stream effect.R9, W2 and D4, R8 constitute divider, adjust W2 and can change output voltage, and R10, C6 form wave filter.When the positive half cycle of AC signal in the input amplification rectification circuit, at first amplify by operational amplifier a, by the public ground of C5 → D4 → R8 → W2 → R9 → circuit, to the C5 charging, the voltage after the D4 rectification is added on the load resistance R10 again.When the AC signal negative half period in the input circuit, through the public ground → R9 of circuit → W2 → R7 → D3 → C5 → operational amplifier a, this moment, C5 slowly discharged.Finish halfwave rectifier thus, output dc voltage.The voltage follower that this DC voltage is made up of operational amplifier b again becomes voltage signal into current signal, delivers to functional switch 8.When switch 8 was in the f position, this current signal was promptly indicated on ammeter 3.If there is not indication on the ammeter 3, promptly the track circuit no current shows that track circuit has open fault.Greater than normal current, illustrate then that circuit has short trouble as electric current.For short trouble, can forward be placed on this device case 6 on the insulated gage rod of suspecting electric leakage or on other object that can leak electricity.If ammeter 3 throws of pointer, then there is leak current fault herein in explanation.Utilize this device can search fault easily and quickly.

This device can increase some measuring abilities easily, as test cross stream voltage, DC voltage, current/voltage, resistance etc.It is that the railway electrical worker is easy to carry, strong interference immunity, can search the ideal tools of track circuit fault rapidly.

Claims

1, a kind of track circuit failure checking instrument, comprise the housing that has ammeter and gauge tap and assemble its interior control element, it is characterized in that forward placing in the housing of track upper surface, the length direction strip silicon steel sheet parallel with the housing width is installed, be assembled in induction coil on the silicon steel sheet by gauge tap, respectively with testing circuit in each range contact join and with amplify rectification circuit and join.

2, checking instrument according to claim 1 is characterized in that being assembled with in the housing two series connection reversal connection induction coils of an induction coil or setting parallel to each other.

3, checking instrument according to claim 1 is characterized in that amplifying rectification circuit and adopts operational amplifier.