CN-114629363-B - Track circuit

CN114629363BCN 114629363 BCN114629363 BCN 114629363BCN-114629363-B

Abstract

The invention discloses a track circuit. The track circuit comprises a first steel rail, a second steel rail, a power supply circuit, an electronic switch board and a track relay, wherein the power supply circuit is used for converting a power frequency power supply into different direct current voltage levels and outputting the direct current voltage levels through a first direct current end and a second direct current end respectively to supply power to the first steel rail and the second steel rail, the electronic switch board is connected with a power receiving end of the first steel rail, a power receiving end of the second steel rail and a second end of the track relay respectively and used for controlling on-off between the power receiving end of the second steel rail and the second end of the track relay according to the relative relation between the voltage difference between the power receiving ends of the two steel rails and a preset value, and the track relay is used for correspondingly sucking up or dropping down according to the on-off of the power supply circuit so as to indicate the occupation condition of a track section. The scheme improves the reliability and the sensitivity of the track circuit indication function.

Inventors

LIU MINGCAI
CHEN GAOHUI
ZHUO HANQUAN
Zheng Yueyong

Assignees

广东韶钢松山股份有限公司

Dates

Publication Date: 20260508
Application Date: 20220406

Claims (9)

1. The track circuit is characterized by comprising a track section, a power supply circuit, an electronic switch board and a track relay; the track section comprises a first steel rail and a second steel rail corresponding to the first steel rail; The power supply circuit comprises a power supply end, a first direct current end and a second direct current end, wherein the power supply end is connected with a power frequency power supply, the positive electrode of the first direct current end is connected with the first end of the track relay, the positive electrode of the second direct current end is connected with the power transmission end of the first steel rail, the negative electrode of the second direct current end is respectively connected with the power transmission end of the second steel rail and the negative electrode of the first direct current end, and the power supply circuit is used for converting the power frequency power supply into different direct current voltage levels and outputting the different direct current voltage levels through the first direct current end and the second direct current end respectively; the electronic switch board is respectively connected with the powered end of the first steel rail, the powered end of the second steel rail and the second end of the track relay and is used for controlling the on-off between the powered end of the second steel rail and the second end of the track relay according to the relative relation between the voltage difference of the powered ends of the two steel rails and a preset value; the electronic switch board comprises a first access end, a second access end, a switch signal output end, a voltage stabilizing diode, an error-proof diode, a first switch tube and a second switch tube, wherein the first access end is connected with the power receiving end of the first steel rail, the second access end is connected with the power receiving end of the second steel rail, the switch signal output end is connected with the second end of the track relay, the voltage stabilizing diode is connected between the first access end and the second access end, the error-proof diode is connected with the voltage stabilizing diode in parallel and is opposite to the connection direction of the voltage stabilizing diode, the control ends of the first switch tube and the second switch tube are connected with the first access end, the first end of the first switch tube is used as the switch signal output end, the second end of the first switch tube is connected with the first end of the second switch tube, and the second end of the second switch tube is connected with the second access end; the track relay is used for being correspondingly sucked up or dropped down according to the on-off of the power supply circuit so as to indicate the occupation condition of the track section.
2. The track circuit of claim 1 wherein said power supply circuit comprises a first power supply circuit and a second power supply circuit, said first power supply circuit having an input connected to said power supply terminal, an output of said first power supply circuit being said first dc terminal, said first power supply circuit being configured to convert said power frequency power to dc power of a first voltage level and output via said first dc terminal; The input end of the second power supply circuit is connected with the power supply end, the output end of the second power supply circuit is used as the second direct current end, and the second power supply circuit is used for converting the power frequency power supply into direct current with a second voltage level and supplying the direct current to the power transmission sides of the first steel rail and the second steel rail through the second direct current end.
3. The track circuit according to claim 2, wherein the first power supply circuit includes a first transforming unit and a first rectifying unit, a first end of the first transforming unit is used as an input end of the first power supply circuit, a second end of the first transforming unit is connected with an input end of the first rectifying unit, an output end of the first rectifying unit is connected with the first dc end, the first transforming unit is used for performing a first step-down process on the power frequency power supply, and the first rectifying unit is used for converting an ac signal output by the first transforming unit into dc.
4. The track circuit according to claim 2, wherein the second power supply circuit includes a second transforming unit and a second rectifying unit, a first end of the second transforming unit is used as an input end of the second power supply circuit, a second end of the second transforming unit is connected with an input end of the second rectifying unit, an output end of the second rectifying unit is connected with the second dc end, the second transforming unit is used for performing a second step-down process on the power frequency power supply, and the second rectifying unit is used for converting an ac signal output by the second transforming unit into dc.
5. The track circuit of claim 1 wherein the track section further comprises at least one first branch rail and a second branch rail corresponding to the first branch rail, the first end of the first branch rail being mechanically connected to the second rail via an insulator, the first end of the first branch rail dividing the second rail into a second fork front section and a second fork rear section, an insulator being disposed between the second fork front section and the second fork rear section, the first end of the second branch rail being mechanically connected to the first rail via an insulator, the first end of the second branch rail dividing the first rail into a first fork front section and a first rear section, the first fork front section and the first fork rear section being electrically connected to each other, the second end of the first branch rail being electrically connected to the first fork front section, the second end of the second branch rail being electrically connected to the second fork rear section, the second end of the second branch rail being electrically connected to the first fork front section.
6. The track circuit of claim 5 wherein said power delivery ends of said first rails in each of said track segments are connected in sequence, each connected to a positive pole of said second dc terminal, and said power delivery ends of said second rails in each of said track segments are connected in sequence, each connected to a negative pole of said second dc terminal.
7. The track circuit of claim 1 further comprising a divider resistor connected between the power delivery end of the first rail and the positive pole of the second dc end.
8. The track circuit of claim 1, further comprising a detection switch disposed between the electronic switch board and the second end of the track relay for disconnecting the electronic switch board from the track relay when the track relay requires detection.
9. The track circuit of claim 1 wherein the number of track sections is a plurality, the plurality of track sections corresponding to one of the electronic switch boards and one of the track relays, the number of electronic switch boards and the number of track relays being equal to the number of track sections and each corresponding to one of the track sections.

Description

Track circuit Technical Field The embodiment of the invention relates to railway technology, in particular to a track circuit. Background The track circuit is widely applied to various locomotive tracks, can detect whether the rail is idle or not and correspondingly send out signals so as to realize the collection of the track occupation condition. The traditional track circuit adopts power frequency to provide power for the power transmission end of the track, and the track relay drops or sucks up according to the voltage level of the power transmission end of the track after being converted by the transformer so as to indicate whether the corresponding track section is occupied by a vehicle. However, the railway environment of metallurgical and industrial and mining enterprises is poor, track sections often accompany track surface corrosion and pollutant coverage, track relays often cannot correctly reflect track occupation information, and reliability is low. Disclosure of Invention The invention provides a track circuit, which is used for improving the reliability and the sensitivity of an indication function of the track circuit. The embodiment of the invention provides a track circuit, which comprises a track section, a power supply circuit, an electronic switch board and a track relay, wherein the track section is connected with the power supply circuit; the track section comprises a first steel rail and a second steel rail corresponding to the first steel rail; The power supply circuit comprises a power supply end, a first direct current end and a second direct current end, wherein the power supply end is connected with a power frequency power supply, the positive electrode of the first direct current end is connected with the first end of the track relay, the positive electrode of the second direct current end is connected with the power transmission end of the first steel rail, the negative electrode of the second direct current end is respectively connected with the power transmission end of the second steel rail and the negative electrode of the first direct current end, and the power supply circuit is used for converting the power frequency power supply into different direct current voltage levels and outputting the different direct current voltage levels through the first direct current end and the second direct current end respectively; The electronic switch board is respectively connected with the powered end of the first steel rail, the powered end of the second steel rail and the second end of the track relay and is used for controlling the on-off between the powered end of the second steel rail and the second end of the track relay according to the relative relation between the voltage difference of the powered ends of the two steel rails and a preset value; the track relay is used for being correspondingly sucked up or dropped down according to the on-off of the power supply circuit so as to indicate the occupation condition of the track section. Optionally, the power supply circuit comprises a first power supply circuit and a second power supply circuit, wherein the input end of the first power supply circuit is connected with the power supply end, the output end of the first power supply circuit is used as the first direct current end, and the first power supply circuit is used for converting the power frequency power supply into direct current with a first voltage level and outputting the direct current with the first voltage level through the first direct current end; the input end of the second power supply circuit is connected with the power supply end, the output end of the second power supply circuit is used as the second direct current end, and the second power supply circuit is used for converting the power frequency power supply into direct current with a second voltage level and supplying the direct current to the power transmission sides of the first steel rail and the second steel rail through the second direct current end. Optionally, the first power supply circuit includes first transformation unit and first rectification unit, the first end of first transformation unit is as the input of first power supply circuit, the second end of first transformation unit with the input of first rectification unit is connected, the output of first rectification unit with first direct current end is connected, first transformation unit is used for carrying out first step-down processing to the power frequency power, first rectification unit is used for with the alternating current signal of first transformation unit output is direct current. Optionally, the second power supply circuit includes a second voltage transformation unit and a second rectification unit, the first end of the second voltage transformation unit is used as the input end of the second power supply circuit, the second end of the second voltage transformation unit is connected with the input end of the second rectifi