A device for testing functions of a railway digital interlocking system and a method of use

Abstract

This invention discloses a device and method for functional testing of a railway digital interlocking system, relating to the field of railway signal testing technology. The device includes a test cabinet. From top to bottom, the front of the test cabinet is arranged a signal simulation unit, a coded simulation unit, a relay drive acquisition simulation unit, a KVM display, an industrial control computer, a switch, a turnout simulation device, a 25Hz power supply module, and a track transformer. The back of the test cabinet contains scattered simulation units. This invention solves the problem that existing single-board testing cannot detect the system-level integration effect of multi-board collaborative operation, thus improving the efficiency and reliability of the final product's factory testing.

Description

Technical Field

[0001] This invention relates to the field of railway signal testing technology, specifically to a device and method for functional testing of a railway digital interlocking system. Background Technology

[0002] With the continuous expansion of the railway network and the increasing service life of existing lines, signaling systems have entered a period of large-scale upgrading and renovation. As a typical representative of new productivity in the field of rail transit signaling, digital interlocking systems are being rapidly promoted from newly built lines to the renovation of existing lines. Therefore, the safety and reliability of the entire operation of digital interlocking systems are of particular importance.

[0003] Currently, factory testing of domestic digital interlocking systems still primarily focuses on single-board functional testing, meaning that each type of actuator board undergoes independent functional verification. After the functional testing of one actuator module is completed, manual replacement of test fixtures and cables is required to adapt to the testing of the next type of board. This replacement process is time-consuming, resulting in low testing efficiency, high labor costs, and frequent cable plugging / unplugging and fixture switching, which can easily introduce human error. Furthermore, existing whole-system testing methods are relatively limited. Currently, only ambient temperature aging tests are conducted with all boards fully configured, observing whether the system exhibits faults during continuous power-on to determine its stability. However, the aforementioned whole-system aging test only reflects the basic electrical safety of the boards under power-on conditions. When multiple different types of actuator boards operate collaboratively on the same backplane bus, this testing environment cannot reflect system-level integration effects such as bus contention, data conflicts, and multi-board functional collaboration, nor can it simulate the mutual influence between modules under complex field conditions. This leads to potential problems in the collaborative operation of the entire system being missed during the factory testing phase.

[0004] In summary, while current single-board functional testing and whole-system aging tests can ensure the basic electrical safety and functional integrity of individual boards and the entire system to a certain extent, they are essentially "individual unit inspections" rather than "system verification." If these testing blind spots extend to the operational field, they can lead to equipment malfunctions such as improper turnout switching and signal abnormalities, or even dangerous situations like incorrect route openings. This not only disrupts transportation order and causes public outcry, but also directly endangers train operation safety. Therefore, there is an urgent need for a functional testing device that covers the collaborative operation of multiple boards across the entire system to fill the crucial gap in the existing testing chain for "whole-system verification." Summary of the Invention

[0005] (a) Technical problems to be solved In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an apparatus and a method for functional testing of a railway digital interlocking system, so as to solve the problems mentioned in the background art.

[0006] (II) Technical Solution To achieve the above objectives, the present invention is implemented through the following technical solution: a device for functional testing of a railway digital interlocking system, comprising a test cabinet, wherein the front of the test cabinet is arranged from top to bottom with a signal simulation unit, a coded simulation unit, a relay drive acquisition simulation unit, a KVM display, an industrial control computer, a switch, a turnout simulation device, a 25Hz power supply module, and a track transformer; the back of the test cabinet is arranged with scattered simulation units; The signal simulation unit consists of 8 parallel circuits. Each circuit consists of 1 LED and 1 resistor connected in parallel. The LED is connected to the signal board output cable of the external interlocking system through a terminal adapter. The coded simulation unit includes a coding channel test simulation device, a track transmission channel test simulation device, and an FBJ channel test simulation device. The coding channel test simulation device consists of 8 indicator lights, the track transmission channel test simulation device consists of 8 tungsten filament bulbs, and the FBJ channel test simulation device consists of 2 rocker switches. Each indicator light and switch is connected to the coded output cable through a terminal adapter. The relay drive acquisition simulation unit includes a relay drive simulation device and a relay acquisition simulation device. The relay drive simulation device consists of 16 relays and is connected to the relay drive output cable via a terminal adapter. The relay acquisition simulation device consists of 32 toggle switches and is connected to the relay acquisition output cable via a terminal adapter. The turnout simulation unit consists of two turnout simulation devices, which are used to provide power for the DC turnout module and the AC turnout module. The 25Hz power supply module and track transformer are used to complete the functional testing of the 25Hz track circuit module. The secondary output voltage of the track transformer is 14.2 V to 15.8 V.

[0007] Furthermore, the dimensions of the test cabinet are 600 mm × 800 mm × 2350 mm.

[0008] Furthermore, in the signal generator simulation unit, the rated voltage of each LED is AC 220 V, the resistance of each resistor is 2KΩ, and the lighting current range of each circuit is 110mA~120mA.

[0009] Furthermore, the output cables of the scattered modules, from cable 1 to cable 6, are connected to the six circuit breakers of the test cabinet, and drives 1 to 4 are connected to the terminals of the test cabinet.

[0010] Furthermore, the device is suitable for testing the following eight functional boards in the execution part of the digital interlocking system: DC turnout module, AC turnout module, signal module, 25Hz track circuit module, coded module, relay drive module, relay acquisition module, and miscellaneous modules.

[0011] 6. A method for using a functional testing device for a railway digital interlocking system, comprising the following steps: S1: In the power-off state, connect the output cables of each board of the digital interlocking system to the corresponding analog unit terminals of the test device; S2: The digital interlocking system under test and the test device are powered on, the industrial control computer and the host computer test software are run, and the configuration information is synchronized with the lower computer of the interlocking system. S3: Perform functional tests on each execution module. The tests of each module can be performed synchronously in parallel or in any order. During the test, the preceding modules remain unchanged and run continuously. New test modules are implemented on the basis of the preceding modules. The host computer software interface, the light positions on the execution cabinet panel, and the action response of each simulation unit are observed synchronously. S4: After the test is completed, the status of each module is restored to the initial off state.

[0012] Furthermore, the functional testing of each execution module described in step S3 includes: Signal module test: Issue commands to turn on, flash, or turn off the signal lights using the host computer software, and observe whether the action response of the corresponding lights in the execution cabinet and the LED lights in the signal machine simulation unit is consistent with the command. Electro-coded module test: The host computer software sequentially illuminates the indicator lights of the coding channel and the tungsten filament bulbs of the track transmission channel, and the FBJ channel's transmission function is tested by closing or opening the rocker switch. The action response of the corresponding light position in the execution cabinet and the simulation unit is observed to be consistent with the command. Relay drive and acquisition module test: Drive each relay to pick up or drop in sequence through the host computer software, and acquire the switch signal by closing or opening each toggle switch in sequence. Observe whether the corresponding lamp position and relay action status of the execution cabinet are consistent with the command. DC turnout module and AC turnout module test: Issue the fixed operation unlock or reverse operation unlock command through the host computer software, observe whether the switch machine simulation device rotates to the positioning or reverse position, and whether the corresponding indicator light position of the actuator cabinet is correct; 25Hz track circuit module test: Simulate the occupied or idle state of the track section by closing or opening the circuit breaker of each track section, and observe whether the corresponding lamp position of the execution cabinet and the display of the host computer software interface are consistent. Scattered module testing: Drive the output of scattered modules through the host computer software and measure the voltage value with a multimeter. Also, collect switch signals by closing or opening the circuit breaker and observe whether the corresponding lamp position in the execution cabinet and the display on the host computer software interface are consistent.

[0013] Furthermore, each execution module includes two sets of boards, A-series and B-series. After the A-series test is completed, the A-series is shut down and the B-series is started. The corresponding cables are then connected to the B-series interface board and the test is repeated.

[0014] Furthermore, after the tests of each module in step S3 are completed, a reversal test step is also included: using the dual-machine switching box of the interlocking system, a reversal test is performed on the A system and the B system, repeated 10 times, and the main and backup status of the A system and the B system on the host computer software interface is observed to be consistent with the actual status of the interlocking machine.

[0015] (III) Beneficial Effects This invention provides an apparatus and method for functional testing of a railway digital interlocking system, which has the following beneficial effects: 1. This invention integrates the previously fragmented single-board testing into multi-board collaborative verification through an integrated whole-machine functional testing device. It realistically reproduces the parallel operation of eight execution modules (DC turnout, AC turnout, signal, 25Hz track circuit, coded signal, relay drive, relay acquisition, and scattered modules) on the backplane bus under the same testing environment. It can effectively expose system-level integration effect problems such as bus contention, data conflict, and collaborative timing, so that the whole machine can complete "system verification" rather than "individual unit inspection" before leaving the factory, eliminating key blind spots in the existing testing chain and ensuring the safety and reliability of the delivered products in the field.

[0016] 2. This invention adopts an integrated cabinet design, in which all simulation units are pre-integrated and installed. After the cables are connected once, all module tests can be completed through unified control via host computer software. There is no need to repeatedly change tooling and cables in each single board test room. This significantly improves testing efficiency and reduces labor costs in a mass production environment, while avoiding human operation deviations caused by frequent cable plugging and unplugging.

[0017] 3. The testing device of this invention can be deployed once and standardized. Operators only need to connect the cables according to the process and operate through the host computer software. The method is simple and intuitive, reducing the dependence on the experience of the testing personnel.

[0018] 4. This invention supports synchronous operation of multiple modules, allowing all signal lights to be lit, all relays to be activated, all toggle switches to be collected, and turnouts to be switched synchronously, with all functional states presented simultaneously. Traditional single-board testing can only verify the basic electrical functions of individual lights and relays, limiting it to "single-point fault detection." This invention, through parallel excitation and synchronous observation, can quickly detect system-wide faults that only surface under multi-board collaborative conditions, truly upgrading factory testing to system-level verification. Attached Figure Description

[0019] Figure 1 This is a flowchart of the overall functional testing process for this invention; Figure 2 This is a schematic diagram of the test cabinet layout for the test device of the present invention; Figure 3 This is a diagram of the host computer operation interface of the testing device of the present invention; Figure 4 This is a test topology diagram of the test device of the present invention; Figure 5 This is a schematic diagram of the interface after synchronous configuration of the present invention; Figure 6 This is a schematic diagram of the indicator light selection interface for the signal module of the present invention; Figure 7 This is a schematic diagram of the flashing light selection interface of the signal module of the present invention; Figure 8 This is a schematic diagram of the light-off selection interface of the signal module of the present invention; Figure 9 This is a schematic diagram of the turnout fixed operation unlocking interface of the present invention; Figure 10 This is a schematic diagram of the turnout reverse operation unlocking interface of the present invention; Figure 11 This is a schematic diagram of the turnout lock-up interface without command according to the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The present invention will now be described in detail through specific embodiments, as follows: (See attached specification) Figure 1-4As can be seen, the device provided by the present invention for functional testing of a railway digital interlocking system includes a test cabinet with dimensions of 600 mm × 800 mm × 2350 mm. The front of the cabinet, from top to bottom, is arranged with a signal simulation unit, a coded signal simulation unit, a relay drive acquisition simulation unit, a KVM monitor, an industrial computer (including a mouse and keyboard), a switch, a turnout simulation device, a 25Hz power supply module, and a track transformer; the back of the cabinet contains scattered simulation units.

[0022] The specific structure of each simulation unit is as follows: The signal simulation unit consists of eight LEDs rated at AC 220 V and eight 2KΩ resistors. Each circuit group comprises one LED and one 2KΩ resistor connected in parallel, for a total of eight circuit groups. When the current in each circuit group is within the range of 110mA to 120mA, the LEDs illuminate, realizing the signal simulation function. The LEDs are connected to the signal output cable of the external interlocking system via terminal adapters.

[0023] The coded simulation unit includes a coding channel test simulation device, a track transmission channel test simulation device, and an FBJ channel test simulation device. The coding channel test simulation device consists of eight 24V indicator lights, the track transmission channel test simulation device consists of eight AC 220V tungsten filament bulbs, and the FBJ channel test simulation device consists of two rocker switches. Each indicator light and switch is connected to the coded output cable via a terminal adapter.

[0024] The relay drive simulation unit consists of 16 relays, which are connected to the relay drive output cable via terminal adapters. The relay acquisition simulation unit consists of 32 toggle switches, which are connected to the relay acquisition output cable via terminal adapters.

[0025] The turnout simulation unit consists of two turnout simulation devices. A power cable connects the DC 220V AC power supply to the test board, providing power to both the DC and AC turnout modules. A 25Hz power module and track transformer are used for functional testing of the 25Hz track circuit module. A track local power cable connects the 25Hz track circuit module and the test board, providing local AC 110V power to the 25Hz track circuit module. A track circuit cable connects the track transformer and the test board, providing track circuit status information to the 25Hz track circuit module. Output cables from components 1 to 6 are connected to the six circuit breakers in the test equipment cabinet, and drives 1 to 4 are connected to the terminals in the test equipment cabinet.

[0026] The functional testing device provided by this invention is applicable to the testing of all functional boards in the execution part of a digital interlocking system, mainly including the following eight modules: DC turnout module, AC turnout module, signal module, 25Hz track circuit module, coded module, relay drive module, relay acquisition module, and miscellaneous modules. Each type of board is connected to the corresponding analog unit in the testing device cabinet via corresponding output cables, and is uniformly controlled and functionally verified by the host computer software. It should be noted that the application scope of this invention is not limited to the above eight modules; it is applicable to any similar railway signal execution boards using the same testing principle.

[0027] The following uses a complete test of a certain type of digital interlocking system as an example to explain in detail the usage method of the present invention.

[0028] I. Test Preparation and System Configuration S1: In the power-off state, connect the output cables of each board of the digital interlocking system to the corresponding analog unit terminals of the test device, and check that the cable connections are correct.

[0029] S2: Power on the digital interlocking system under test and the test device, run the industrial control computer, and open the KVM display terminal. Run the host computer test software and synchronize the configuration information with the lower-level interlocking system to ensure that the host computer software interface corresponds to the interlocking system board interface, such as... Figure 5 As shown.

[0030] II. Implementation Methods for Functional Testing of Each Module In this invention, the tests of each module can be performed synchronously and in parallel, or they can be carried out one by one in any order. The following description is for each module, assuming that the preceding modules in steps S3 to S9 remain unchanged and continue to run. The newly added test modules are implemented on top of the preceding modules, thus completely reproducing the actual working conditions of the entire machine's multi-board collaborative operation. The test methods for each module can be executed sequentially as described below, or the module test order can be randomly changed; neither method affects the observation of the overall machine's operating status and fault diagnosis.

[0031] S3: Signal Module Test. Before testing, confirm that the signal type configuration in the host computer software is correct, that the signal input terminal is connected to an external AC 220V power supply, and that the signal analog unit is connected to the signal output cable. After the equipment is running normally, observe the master / slave status of the signal module in the interlocking system execution cabinet. It should be consistent with the master / slave status in the corresponding "Signal" status box on the host computer software interface. Perform a system switching operation on the signal module and observe the master / slave status again; it should remain consistent.

[0032] like Figure 6As shown, click on "Lamp 1" with the mouse, select the "Turn On" command, and confirm. At this time, the "Signal" status box on the host computer software interface will light up corresponding to "Lamp 1," the interlocking system execution cabinet will light up the corresponding signal module "Lamp 1," and the signal controller simulation unit will light up the corresponding LED. For example... Figure 7 As shown, selecting the "Flash Light" command will put the corresponding light into flashing mode. Figure 8 As shown, selecting the "Turn Off" command will turn off the corresponding light. Test all lights on the signal module sequentially. The spare board must be switched to primary mode before testing. After testing, all "Signal" lights should be off.

[0033] S4: Coded Module Test. Before testing, confirm that the coded type configuration in the host computer software is correct, and confirm that the coded interface board is correctly connected to the code 1 signal output cable, the rail drive frequency shift signal output cable, and the rail drive frequency shift signal input cable. Connect FBJ-Q and FBJ-H to the rocker switches SW1 and SW2. After the equipment is running normally, observe the master / slave status of the coded module in the execution cabinet. It should be consistent with the master / slave status of the corresponding "Coded" status box on the host computer software interface. After switching, confirm consistency again.

[0034] Clicking the "Code 1" indicator light will illuminate the "Code 1" light in the "Coded Status" box on the host computer software interface. This will also illuminate the corresponding "Code 1" indicator light on the execution cabinet's coded module, along with the corresponding LED indicator. Clicking again will turn the light off. Repeat this process to test "Code 1" through "Code 8," ensuring that only one indicator light is illuminated at a time, and the next light is illuminated only after the previous one has turned off.

[0035] Clicking the "Rail Transmission 1" indicator light illuminates the "Rail Transmission 1" light in the "Coded Status" box on the host computer software interface. This also illuminates the corresponding "Rail Transmission 1" indicator light on the execution cabinet's coded module, along with the corresponding tungsten filament bulb. Clicking again extinguishes the light. Testing "Rail Transmission 1" through "Rail Transmission 8" sequentially also results in only one light illuminating at a time.

[0036] Close the rocker switch SW1. The corresponding "Send Message 1" indicator light on the coded module in the execution cabinet will illuminate, and the corresponding "Send Message 1" indicator light on the host computer software interface will also illuminate. Disconnecting SW1 will turn off the indicator light. Test "Send Message 1" and "Send Message 2" sequentially. Test after switching the backup board to the primary board. After completion, all coded status box indicator lights should be off.

[0037] S5: Relay Driver and Acquisition Module Test. Before driver testing, confirm that the relay driver type configuration in the host computer software is correct and that the driver cable is connected to the A series. After the equipment is running normally, observe the master / slave status (master and concurrent use) of the relay driver module in the execution cabinet. It should be consistent with the master / slave status of the corresponding "Relay Driver" status box in the host computer software interface.

[0038] With only the A series enabled, clicking the "Drive 1" indicator light will illuminate the "Drive 1" status box in the host computer software interface. The corresponding "Drive 1" indicator light on the execution cabinet will also illuminate, and the corresponding relay on the test device will normally engage. Clicking again will extinguish the light and deactivate the relay. Test "Drive 1" through "Drive 16" sequentially. Disable the A series, enable the B series, connect the drive cable to the B series interface board, and repeat the above test. After completion, all drive status box indicators should be extinguished.

[0039] Before data acquisition and testing, confirm that the relay acquisition type is configured correctly in the host computer software, and confirm that the negative terminal of the DC 24 V switching power supply is connected to GND of the acquisition cable, and that the acquisition cable is connected to the A series. After the equipment is running normally, observe the main / standby status (main and concurrent) of the relay acquisition module in the execution cabinet. It should be consistent with the main / standby status of the corresponding "Relay Acquisition" status box in the host computer software interface.

[0040] Turn on the "Survey 1" switch. The corresponding relay light on the "Survey 1" module in the cabinet will illuminate, and the corresponding "1" light on the host computer software interface will also illuminate. Turning it off will turn the light off. Test "Survey 1" through "Survey 32" sequentially. Turn off system A, start system B, connect the acquisition cable to system B, and repeat the test. After completion, all acquisition status indicator lights will turn off.

[0041] S6: DC turnout module test. Before testing, confirm that the DC turnout type configuration in the host computer software is correct according to the station configuration list. Confirm that the DC turnout power input terminals are connected to two AC 220 V power supplies (terminals 1 to 2 from the left when looking at the cabinet are for operation, and terminals 3 to 4 are for indication). The DC turnout interface board is correctly connected to the DC switch machine simulation device through the DC turnout signal output cable (4-wire or 6-wire).

[0042] After the equipment is running normally, observe the master / slave status of the DC turnout module in the execution cabinet. It should match the master / slave status of the corresponding "DC Turnout" status box on the host computer software interface. Confirm consistency after switching systems. If the turnout is in the reverse position, such as... Figure 9 As shown, click the "Fixed Operation" indicator light, select the "Fixed Operation Unlock" command from the submenu, and confirm. The "Fixed Operation" indicator light on the corresponding DC turnout module in the execution cabinet will flash, and the DC turnout simulator will rotate to the correct position. After rotating to the correct position, the "Fixed Operation" indicator light will turn off, the "Fixed Indicator" indicator light will turn on, and the simulator will display "Positioned." When the turnout is in the correct position, as shown... Figure 10 As shown, click the "Reverse Operation" indicator light and select the "Reverse Operation Unlock" command. The "Reverse Operation" indicator light on the control cabinet will flash, the simulator will rotate to the reverse position, and once in place, the "Reverse Operation" light will turn off and the "Reverse Meter" light will turn on. Test all DC turnout module boards sequentially, switching the backup board to the primary test. After completion, as shown... Figure 11 As shown, select the "No Command Lock" command from the submenu and confirm.

[0043] S7: AC turnout module test. Before testing, confirm that the AC turnout type configuration in the host computer software is correct according to the station configuration list. Confirm that the AC turnout power input terminals (terminals 1 to 3 from the left when viewed from the rear of the cabinet, which are yellow, green, and red in sequence) are connected to an external AC 380 V power supply, and terminals 4 to 5 from the left are connected to an external AC 220 V power supply. The AC turnout interface board is correctly connected to the AC switch machine simulation device through the AC turnout signal output cable.

[0044] After the equipment is running normally, observe the master / slave status of the AC turnout module in the actuator cabinet. It should be consistent with the master / slave status of the corresponding "AC Turnout" status box on the host computer software interface. Confirm consistency after switching systems. The test procedure is the same as that for DC turnouts, including scheduled unlocking / reverse unlocking and no-command locking operations, which will not be described in detail here.

[0045] S8: 25Hz Track Circuit Module Test. Before testing, confirm that the track type configuration in the host computer software is correct, and confirm that the track circuit power input terminal is connected to the AC 110 V power strip of the test device cabinet. Ensure the track transformer is correctly connected to the track circuit signal output cable. Short-circuit I2 and I3, and III3 and II2 of the track transformer (model BG3-130 / 25). Connect I1 to the 220V-L track power supply, I4 to the 220V-N track power supply, II1 to the negative terminal of the track circuit cable, and III1 to the positive terminal of the track circuit cable. Ensure the transformer secondary output voltage is within the range of 14.2V to 15.8V.

[0046] After the equipment is running normally, observe the primary / standby status of the execution cabinet track modules. It should match the primary / standby status in the corresponding "Track" status box on the host computer software interface. Close the circuit breaker for track section 1; the corresponding "Section 1" indicator light on the execution cabinet track module will illuminate, and the corresponding "Section 1" indicator light on the host computer software interface will also illuminate. Disconnecting the circuit breaker will extinguish the light. Test sections 1 through 4 sequentially. Power off the B-series boards when testing A-series, and vice versa. After completion, all track section lights should be extinguished.

[0047] S9: Loose Module Test. Before testing, confirm that the loose module type configuration is correct in the host computer software and that the loose power input terminal is connected to the DC 24 V power strip of the test device cabinet. After the equipment is running normally, observe the main / standby status (main and concurrent) of the loose modules in the execution cabinet. It should be consistent with the main / standby status of the corresponding "Loose" status box on the host computer software interface.

[0048] Click the "Drive 1" indicator light with the mouse. The "Drive 1" indicator light in the "Scattered" status box on the host computer software interface will illuminate. The corresponding "Drive 1" indicator light on the execution cabinet will also illuminate. Use a multimeter to measure the voltage output value of the "Drive 1" terminal on the back of the test device. The acceptable range is DC 24.00V to DC 130.00V. Click "Drive 1" again to turn off the light; the measured voltage value should be 0V. Complete the tests for "Drive 1" through "Drive 4" sequentially.

[0049] Close the "Cai 1" circuit breaker. The corresponding indicator light on the "Cai 1" module in the execution cabinet will illuminate, and the corresponding indicator light on the host computer software interface will also illuminate. Disconnecting the circuit breaker will extinguish the indicator light. Test "Cai 1" through "Cai 6" sequentially. Power off the B-series boards when testing the A-series, and power off the A-series boards when testing the B-series. After completion, all indicator lights on the status boxes will turn off.

[0050] S10: Reversal Test. Using the dual-machine switching box of the interlocking system, perform a reversal test on the main A and B systems of the interlocking system, repeating 10 times. During the test, observe that the main and backup status of the A and B systems on the host computer software interface should be consistent with the actual status of the interlocking machines. Simultaneously, the interlocking machines and electronic actuators should function normally, and the fault indicator lights should remain off.

[0051] In steps S3 to S9 above, all module tests can be performed synchronously and in parallel. That is, while the signal lights remain illuminated, tests can be performed simultaneously on the coded signaling / track transmission channel, relay drive / acquisition, turnout turnout switching, track section occupancy / idleness, and individual module drive / acquisition. Each simulation unit operates independently without interference. Testers can simultaneously observe the host computer software interface, the indicator lights on the execution cabinet panel, and the action responses of each simulation unit, achieving parallel excitation of multiple modules and system-level synchronous observation. The specific test order of each module can also be flexibly adjusted to comprehensively verify the operational stability of the entire system under multi-task concurrent conditions.

[0052] The testing method of this invention involves multiple high-voltage connection operations, including but not limited to: AC 220 V power supply connection for the signal analog unit, AC 220 V wiring for the coded track frequency shift signal input, AC 220 V operating and indicating power supply connection for the DC turnout module, AC 380 V and AC 220 V power supply connection for the AC turnout module, and AC 220 V track power supply and AC 110 V local power supply connection for the track circuit module. All cable connections and replacement operations involving the above high-voltage links must be performed with the power off. It is strictly forbidden to plug or unplug cables while the power is on to prevent electric shock. If cable switching is required during testing, the corresponding power supply should be disconnected first, and power can only be restored after the wiring is completed and checked for errors.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

[0054] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any modifications, alterations, substitutions, and variations made by those skilled in the art to the above embodiments are within the scope of the present invention.

Claims

1. A device for functional testing of a railway digital interlocking system, characterized in that, The test cabinet includes a signal simulation unit, a coded simulation unit, a relay drive acquisition simulation unit, a KVM display, an industrial computer, a switch, a turnout simulation device, a 25Hz power supply module, and a track transformer arranged sequentially from top to bottom on the front side of the test cabinet; the back side of the test cabinet has scattered simulation units arranged on the back side. The signal simulation unit consists of 8 parallel circuits. Each circuit consists of 1 LED and 1 resistor connected in parallel. The LED is connected to the signal board output cable of the external interlocking system through a terminal adapter. The coded simulation unit includes a coding channel test simulation device, a track transmission channel test simulation device, and an FBJ channel test simulation device. The coding channel test simulation device consists of 8 indicator lights, the track transmission channel test simulation device consists of 8 tungsten filament bulbs, and the FBJ channel test simulation device consists of 2 rocker switches. Each indicator light and switch is connected to the coded output cable through a terminal adapter. The relay drive acquisition simulation unit includes a relay drive simulation device and a relay acquisition simulation device. The relay drive simulation device consists of 16 relays and is connected to the relay drive output cable through a terminal adapter. The relay acquisition simulation device consists of 32 toggle switches, which are connected to the relay acquisition output cable via terminal adapters. The turnout simulation unit consists of two turnout simulation devices, which are used to provide power for the DC turnout module and the AC turnout module. The 25Hz power supply module and track transformer are used to complete the functional testing of the 25Hz track circuit module. The secondary output voltage of the track transformer is 14.2 V to 15.8 V.

2. The device for functional testing of a railway digital interlocking system according to claim 1, characterized in that, The dimensions of the test cabinet are 600 mm × 800 mm × 2350 mm.

3. The device for functional testing of a railway digital interlocking system according to claim 1, characterized in that, The rated voltage of each LED in the signal generator simulation unit is AC 220 V, the resistance of each resistor is 2KΩ, and the lighting current range of each circuit is 110mA~120mA.

4. The device for functional testing of a railway digital interlocking system according to claim 1, characterized in that, The output cables of the scattered modules, from cable 1 to cable 6, are connected to the six circuit breakers of the test cabinet, and drives 1 to 4 are connected to the terminals of the test cabinet.

5. The device for functional testing of a railway digital interlocking system according to claim 1, characterized in that, The device is applicable to the testing of the following eight functional boards in the execution part of the digital interlocking system: DC turnout module, AC turnout module, signal module, 25Hz track circuit module, coded module, relay drive module, relay acquisition module, and miscellaneous modules.

6. A method of using a functional testing device for a railway digital interlocking system, applied to the device as described in any one of claims 1 to 5, characterized in that, Includes the following steps: S1: In the power-off state, connect the output cables of each board of the digital interlocking system to the corresponding analog unit terminals of the test device; S2: The digital interlocking system under test and the test device are powered on, the industrial control computer and the host computer test software are run, and the configuration information is synchronized with the lower computer of the interlocking system. S3: Perform functional tests on each execution module. The tests of each module can be performed synchronously in parallel or in any order. During the test, the preceding modules remain unchanged and run continuously. New test modules are implemented on the basis of the preceding modules. The host computer software interface, the light positions on the execution cabinet panel, and the action response of each simulation unit are observed synchronously. S4: After the test is completed, the status of each module is restored to the initial off state.

7. The method of using the functional testing device for a railway digital interlocking system according to claim 6, characterized in that, The functional testing of each execution module described in step S3 includes: Signal module test: Issue commands to turn on, flash, or turn off the signal lights using the host computer software, and observe whether the action response of the corresponding lights in the execution cabinet and the LED lights in the signal machine simulation unit is consistent with the command. Electro-coded module test: The host computer software sequentially illuminates the indicator lights of the coding channel and the tungsten filament bulbs of the track transmission channel, and the FBJ channel's transmission function is tested by closing or opening the rocker switch. The action response of the corresponding light position in the execution cabinet and the simulation unit is observed to be consistent with the command. Relay drive and acquisition module test: Drive each relay to pick up or drop in sequence through the host computer software, and acquire the switch signal by closing or opening each toggle switch in sequence. Observe whether the corresponding lamp position and relay action status of the execution cabinet are consistent with the command. DC turnout module and AC turnout module test: Issue the fixed operation unlock or reverse operation unlock command through the host computer software, observe whether the switch machine simulation device rotates to the positioning or reverse position, and whether the corresponding indicator light position of the actuator cabinet is correct; 25Hz track circuit module test: Simulate the occupied or idle state of the track section by closing or opening the circuit breaker of each track section, and observe whether the corresponding lamp position of the execution cabinet and the display of the host computer software interface are consistent. Scattered module testing: Drive the output of scattered modules through the host computer software and measure the voltage value with a multimeter. Also, collect switch signals by closing or opening the circuit breaker and observe whether the corresponding lamp position in the execution cabinet and the display on the host computer software interface are consistent.

8. The method of using the functional testing device for a railway digital interlocking system according to claim 6, characterized in that, Each execution module includes two sets of boards, A-series and B-series. After the A-series test is completed, the A-series is shut down and the B-series is started. The corresponding cables are then connected to the B-series interface board and the test is repeated.

9. The method of using the functional testing device for a railway digital interlocking system according to claim 6, characterized in that, After the tests of each module in step S3 are completed, a reversal test is also included: using the dual-machine switching box of the interlocking system, a reversal test is performed on the A system and the B system, repeated 10 times, and the main and backup status of the A system and the B system on the host computer software interface is observed to be consistent with the actual status of the interlocking machine.

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