Testing device for FTGS track circuit direction conversion plate

Abstract

The utility model discloses a testing device for an FTGS track circuit direction conversion board, and the device comprises a single-chip microcomputer which is used for transmitting a control signal; a plurality of direction conversion plate driving circuits which are connected with the single-chip microcomputer and the direction conversion plate driving loop and are used for driving the direction conversion plate driving loop according to the control signal; the plurality of acquisition circuits are connected with the single-chip microcomputer and the direction conversion plate contacts and are used for acquiring test values of the direction conversion plate contacts and sending the test values to the single-chip microcomputer; and the power supply is connected with the single-chip microcomputer, the plurality of direction conversion board driving circuits and the plurality of acquisition circuits to provide a working power supply. According to the utility model, the plurality of direction conversion board driving circuits are arranged to drive different direction conversion board driving loops, the corresponding number of acquisition circuits are arranged to acquire the test values of the contacts of the direction conversion board, and the single-chip microcomputer is adopted for control, so that the off-line test of the plurality of channel loops of the direction conversion board is realized, and the test efficiency is improved. And the testing efficiency of the direction conversion plate is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of direction conversion board testing technology, specifically to a testing device for FTGS track circuit direction conversion boards. Background Technology

[0002] Urban rail transit signaling systems are crucial for ensuring train safety and improving operational efficiency. Changing and monitoring the direction of signal transmission to achieve train direction changes is a prerequisite for the automatic control of train operation by the signaling system. In the FTGS-917 track circuit system, the component responsible for changing and monitoring the direction of signal transmission to ensure that the track circuit's transmission direction always faces the train's direction of travel is the direction conversion plate.

[0003] The direction conversion board mainly consists of three sets of drive circuits and ten sets of acquisition circuits. Each drive circuit mainly includes one (or two) relay coils, diodes, and voltage divider resistors. Each acquisition circuit mainly includes multiple relay coil contacts and multiple voltage divider resistors, and the circuit test values ​​are changed through DIP switches. When the train's running direction changes, the direction conversion board switches the input and output feeds of the transmitter and receiver, using up to three pairs of cables for switching. For each running direction, the board has a resistor network to set the input level of the receiver, which is then collected by the ATP (Automatic Train Protection) system to change the train's running direction.

[0004] The FTGS track circuit idle detection equipment on Guangzhou Metro Line 1 has been in use for over 22 years, severely exceeding its service life. During its long-term operation, the direction conversion boards have experienced a series of problems, including aging of electrical components and severe oxidation of relay contacts. This has significantly increased the failure rate of the track circuit idle detection system, introducing many unstable factors into the stable operation of the metro. According to fault statistics, 24% of track circuit failures are due to direction conversion board failures. Common fault symptoms include reverse routing or the appearance of a single section of red or pink light bands during equipment self-testing, averaging more than 5 such incidents per month. This has become a major hidden danger affecting the normal operation of the line. Due to the lack of effective equipment for testing the performance of the direction conversion boards, the deterioration of their performance is often not detected in a timely manner during routine maintenance, making it impossible to effectively reduce the failure rate or repair faulty components. As a result, the failure rate remains high year after year, leading to huge spare parts procurement costs. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies in the prior art and provide a testing device for FTGS track circuit direction conversion boards.

[0006] This utility model is achieved through the following technical solution:

[0007] A testing apparatus for an FTGS track circuit direction conversion board, comprising:

[0008] A microcontroller is used to send control signals;

[0009] Several direction conversion board driving circuits are connected to the microcontroller and the direction conversion board driving circuit, and are used to drive the direction conversion board driving circuit according to the control signal;

[0010] Several acquisition circuits are connected to the microcontroller and the direction conversion board contacts, and are used to acquire the test values ​​of the direction conversion board contacts and send them to the microcontroller.

[0011] The power supply is connected to the microcontroller, several direction conversion board drive circuits, and several acquisition circuits to provide operating power.

[0012] As a further improvement of this utility model, the direction conversion board driving circuit includes: an eighth resistor, a ninth resistor, a tenth resistor, a second field-effect transistor, and a photoelectric switch;

[0013] The microcontroller is connected to the second terminal of the photoelectric switch via the eighth resistor;

[0014] The first end of the photoelectric switch is connected to the power supply, the fourth end is grounded through the tenth resistor, and the fifth end is connected to the power supply through the ninth resistor.

[0015] The gate of the second field-effect transistor is connected to the fourth terminal of the photoelectric switch, the source of the second field-effect transistor is grounded, and the drain of the second field-effect transistor is connected to the direction conversion board drive circuit.

[0016] As a further improvement of this utility model, the acquisition circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an operational amplifier, a first field-effect transistor, a voltage regulator, and a first capacitor;

[0017] The power supply is connected to the third pin of the voltage regulator through the first resistor. The third pin of the voltage regulator is connected to the first pin. The third pin of the voltage regulator is grounded through the first capacitor. The second pin of the voltage regulator is grounded. The third pin of the voltage regulator is grounded through the second resistor and the third resistor.

[0018] The second resistor is connected to the positive input terminal of the operational amplifier through the fourth resistor, and the operational amplifier is grounded through the sixth resistor and the seventh resistor;

[0019] The source of the first field-effect transistor is grounded through the seventh resistor, the gate of the first field-effect transistor is connected to the output terminal of the operational amplifier through the fifth resistor, and the drain of the first field-effect transistor is connected to the direction conversion board contact and the microcontroller.

[0020] As a further improvement of this utility model, a light-emitting diode is also connected between the eighth resistor and the second end of the photoelectric switch.

[0021] As a further improvement of this utility model, this utility model also includes: a display screen connected to the microcontroller for displaying the test value.

[0022] As a further improvement of this utility model, 10 of the aforementioned acquisition circuits are provided.

[0023] As a further improvement of this utility model, three of the aforementioned direction conversion board drive circuits are provided.

[0024] As a further improvement of this utility model, the microcontroller is an STM32F103C6.

[0025] Compared with the prior art, this utility model has the following advantages: by setting up a multi-channel direction conversion board drive circuit to drive different direction conversion board drive loops, and at the same time, equipping a corresponding number of acquisition circuits to acquire the test values ​​of the direction conversion board contacts, and using a microcontroller for control, offline testing of multiple channel loops of the direction conversion board is realized, which is used to judge the performance of the direction conversion board and effectively improve the testing efficiency of the direction conversion board. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the testing device described in this utility model;

[0028] Figure 2 This is a schematic diagram of the direction conversion board drive circuit of the present invention;

[0029] Figure 3 This is a schematic diagram of the acquisition circuit described in this utility model;

[0030] Figure 4 This is a schematic diagram of the direction conversion board to be tested.

[0031] In the diagram: 1. Direction conversion board drive circuit; 2. Acquisition circuit; 3. Display screen.

[0032] 100, Direction conversion board contact; 200, Direction conversion board drive circuit. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Based on the working principle of the direction conversion board, the possible causes of the fault are initially identified as follows: aging of the circuit voltage divider resistor, increased contact resistance due to contact oxidation, increased contact resistance due to insufficient contact pressure, and coil failure leading to unreliable engagement. Train running directions are defined as G, A, and B to indicate train operation. The direction conversion board controls three different drive circuits by continuously inputting a high frequency at the board's DIP switch, causing different relays to activate. The ATP (Automatic Train Protection) system collects different feed voltages and determines whether the track circuit's transmitting and receiving directions have changed. This invention designs a testing device for the direction conversion board of the FTGS track circuit based on the working principle of the direction conversion board. Figure 1 As shown, it includes: a microcontroller U1, several direction conversion board driving circuits 1, and several acquisition circuits 2. The microcontroller U1 is used to send control signals; the several direction conversion board driving circuits 1 are all connected to the microcontroller U1, and each direction conversion board driving circuit 1 is connected to a direction conversion board driving loop 200. The direction conversion board driving circuit 1 is used to drive the direction conversion board driving loop 200 according to the control signals; the several acquisition circuits 2 are all connected to the microcontroller U1, and each acquisition circuit 2 is connected to a direction conversion board contact 100. The acquisition circuit 2 is used to collect the test values ​​of the direction conversion board contact 100 and send them to the microcontroller U1.

[0035] It should be noted that for the working principle of the direction conversion board and the construction of the microcontroller U1 minimum system, please refer to existing technologies, which will not be elaborated here.

[0036] The testing device is connected to the direction conversion board. The testing device controls the electrical frequency input of the direction conversion board, so that the drive circuits of different direction conversion boards are connected and the coils are attracted, in order to simulate the change of track circuit direction. At the same time, all the contacts of the direction conversion board are detected and their circuit voltages are analyzed, so as to determine the status of the drive circuit of each direction conversion board, so as to detect the problem of performance degradation of the direction conversion board in time and ensure stable operation.

[0037] like Figure 2 As shown, the direction conversion board driving circuit 1 includes: an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a second field-effect transistor Q1, and a photoelectric switch U4; the microcontroller U1 is connected to the second terminal of the photoelectric switch U4 through the eighth resistor R8; the first terminal of the photoelectric switch U4 is connected to the power supply, the fourth terminal is grounded through the tenth resistor R10, and the fifth terminal is connected to the power supply through the ninth resistor R9; the gate of the second field-effect transistor Q2 is connected to the fourth terminal of the photoelectric switch U4, the source of the second field-effect transistor Q2 is grounded, and the drain of the second field-effect transistor Q2 is connected to the direction conversion board driving circuit 200.

[0038] In this utility model, such as Figure 4 As shown, the testing device uses three-direction conversion board drive circuits to connect the loops in the three directions respectively. Taking direction A as an example, as... Figure 4 As shown, a 24V high frequency is continuously supplied at b4 (i.e., at switch S10), and 0V is connected at b2 (i.e., at switch S8). The contacts of relay RL1 are connected in series with the direction conversion board drive circuit 1. The microcontroller U1 controls the relay to be pulled up, thereby activating relays K2-1 and K12-1 in the drive circuit of direction A.

[0039] Analysis of the self-test direction conversion board drive circuit reveals that there is only one relay coil in the S circuit, while the other two drive circuits contain two relay coils. Since the power supply voltage is 24V, a 110-ohm resistor (not shown in the figure) should be connected in series in the S circuit direction conversion board drive circuit 1 before the relay K1-1 contact to prevent the board fuse F11 from being damaged.

[0040] like Figure 3 As shown, the acquisition circuit 2 includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an operational amplifier U2:A, a first field-effect transistor Q1, a voltage regulator U3, and a first capacitor C1. The power supply is connected to the third pin of the voltage regulator U3 through the first resistor R1. The third pin of the voltage regulator U3 is connected to the first pin. The third pin of the voltage regulator U3 is grounded through the first capacitor C1. The second pin of the voltage regulator U3 is grounded. The third pin of the voltage regulator U3 is also grounded through the second resistor R2 and the third resistor R3. The second resistor R2 is connected to the positive input terminal of the operational amplifier U2:A through the fourth resistor R4. The operational amplifier U2:A is grounded through the sixth resistor R6 and the seventh resistor R7. The source of the first field-effect transistor Q1 is grounded through the seventh resistor R7. The gate of the first field-effect transistor Q1 is connected to the output terminal of the operational amplifier U2:A through the fifth resistor R5. The drain of the first field-effect transistor Q1 is connected to the direction conversion board contact 100 and the microcontroller U1.

[0041] Analysis of the direction conversion board's operating principle reveals that it requires data acquisition from 10 circuits in the G, A, and B directions to assess its performance. These circuits are: Z10-B12, D10-D14, Z18-Z14, D18-B16, Z22-B20, B24-D22, Z28-D28, B8-B6, B8-Z6, and B8-D6. A 3.3V power supply from the microcontroller U1 is provided to Z10, D10, Z18, D18, Z22, B24, Z28, B8, B8, and B8, respectively. The ADC0-9 pins of the main control chip are connected to B12, D14, Z14, B16, B20, D22, D28, B6, Z6, and D6, respectively. Therefore, this invention comprises 10 data acquisition circuits.

[0042] After the circuit is turned on, the current of the first field-effect transistor Q1 is kept constant by using the parallel voltage regulator U3. By comparing the current and voltage relationship, the circuit resistance value in the acquisition circuit can be obtained.

[0043] Furthermore, an LED D1 is connected between the eighth resistor R8 and the second terminal of the photoelectric switch U4, which is lit up when the direction conversion board drive circuit is powered on.

[0044] To facilitate observation of test values, this utility model also includes: a display screen 3 connected to a microcontroller for displaying test values. Preferably, a TJC4832 intelligent serial port screen is used as the display screen. The left side of the display screen 3 displays the channel number and the standard value of the loop resistance, and the right side displays the loop resistance in real time. If it is greater than the standard value or infinite, it will display a red background.

[0045] The microcontroller is an STM32F103C6. The PA0, PA1, PA2, PA3, PA4, PA5, PA6, PA7, PB0, and PB1 ports of microcontroller U1 are used to measure the loop resistance of each channel; the PB12, PB13, and PB14 ports output the control relay drive voltage.

[0046] This invention enables offline testing of 10 channel circuits of the direction conversion board to determine the board's performance and pinpoint the fault location and direction. The offline testing device not only effectively tests spare parts, ensuring the stability of online spare parts, but also allows for offline detection and replacement of faulty parts, pinpointing the fault location, thus greatly facilitating fault handling and routine maintenance. Currently, the offline testing device for the direction conversion board has undergone multiple tests and verifications, demonstrating stable functionality and excellent testing performance. It effectively verifies and tests the performance of the direction conversion board and faulty parts, bringing significant convenience to the daily maintenance work of Guangzhou Metro Line 1 and effectively reducing the track circuit failure rate.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A testing device for an FTGS track circuit direction conversion board, characterized in that, include: A microcontroller is used to send control signals; Several direction conversion board driving circuits are connected to the microcontroller and the direction conversion board driving circuit, and are used to drive the direction conversion board driving circuit according to the control signal; Several acquisition circuits are connected to the microcontroller and the direction conversion board contacts, and are used to acquire the test values ​​of the direction conversion board contacts and send them to the microcontroller. The power supply is connected to the microcontroller, several direction conversion board drive circuits, and several acquisition circuits to provide operating power.

2. The testing apparatus according to claim 1, characterized in that, The direction conversion board driving circuit includes: an eighth resistor, a ninth resistor, a tenth resistor, a second field-effect transistor, and a photoelectric switch; The microcontroller is connected to the second terminal of the photoelectric switch via the eighth resistor; The first end of the photoelectric switch is connected to the power supply, the fourth end is grounded through the tenth resistor, and the fifth end is connected to the power supply through the ninth resistor. The gate of the second field-effect transistor is connected to the fourth terminal of the photoelectric switch, the source of the second field-effect transistor is grounded, and the drain of the second field-effect transistor is connected to the direction conversion board drive circuit.

3. The testing apparatus according to claim 1, characterized in that, The acquisition circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an operational amplifier, a first field-effect transistor, a voltage regulator, and a first capacitor; The power supply is connected to the third pin of the voltage regulator through the first resistor. The third pin of the voltage regulator is connected to the first pin. The third pin of the voltage regulator is grounded through the first capacitor. The second pin of the voltage regulator is grounded. The third pin of the voltage regulator is grounded through the second resistor and the third resistor. The second resistor is connected to the positive input terminal of the operational amplifier through the fourth resistor, and the operational amplifier is grounded through the sixth resistor and the seventh resistor; The source of the first field-effect transistor is grounded through the seventh resistor, the gate of the first field-effect transistor is connected to the output terminal of the operational amplifier through the fifth resistor, and the drain of the first field-effect transistor is connected to the direction conversion board contact and the microcontroller.

4. The testing apparatus according to claim 2, characterized in that, A light-emitting diode is also connected between the eighth resistor and the second terminal of the photoelectric switch.

5. The testing apparatus according to any one of claims 1 to 4, characterized in that, Also includes: A display screen connected to the microcontroller is used to display the test values.

6. The testing apparatus according to claim 1, characterized in that, Ten of the aforementioned acquisition circuits are provided.

7. The testing apparatus according to claim 1, characterized in that, Three of the aforementioned direction conversion board drive circuits are provided.

8. The testing apparatus according to claim 1, characterized in that, The microcontroller is an STM32F103C6.

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