Track circuit outdoor equipment simulation device

Abstract

The invention discloses a track circuit outdoor equipment simulation device which comprises a shell, and a panel of the shell is provided with a switch used for controlling the device to be turned on and turned off. A main rail signal transmission circuit used for simulating and constructing a main rail signal transmission channel and a small rail signal transmission circuit used for simulating and constructing a small rail signal transmission channel between adjacent sections are arranged in the shell. The main rail signal transmission circuit is connected with a digital signal processing module used for collecting voltage values of the input side and the output side of the main rail signal transmission circuit to judge the direction of the rail circuit. And the digital signal processing module is connected with a direction relay which is connected with the main rail signal transmission circuit and is used for changing the main rail signal direction in the main rail signal transmission channel under the driving of the digital signal processing module. According to the invention, outdoor equipment can be simulated, and indoor equipment can be debugged cooperatively, so that the limitation of construction progress is eliminated, and the adjustment and verification of the indoor equipment are realized without outdoor transmission conditions.

Description

Technical Field

[0001] This invention relates to the field of simulation device technology, and more specifically to a simulation device for outdoor equipment of track circuits. Background Technology

[0002] The ZPW-2000 track circuit is a track circuit system optimized and improved based on the French UM71 track circuit technology and adapted to my country's national conditions. It features high safety and high reliability.

[0003] With the advancement of technology in my country, high-speed railway construction has developed rapidly. Currently, the ZPW-2000 track circuit has become the main track circuit standard for my country's railways. During the trial and commissioning of the ZPW-2000 track circuit, due to limitations in project schedule and station construction conditions, the installation of indoor and outdoor equipment is often difficult to complete simultaneously. Without outdoor transmission capabilities, debugging the transmission and reception levels and verifying indoor equipment not only requires repeated disassembly and reassembly of wiring between indoor and outdoor equipment, but also risks potential faults such as misconnections and short circuits due to temporary wiring changes. This non-standard operation not only increases construction safety risks but also adversely affects the subsequent formal joint commissioning of equipment and the overall project progress. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a simulation device for outdoor equipment of track circuits, which can simulate outdoor equipment and cooperate with the debugging of indoor equipment, thereby getting rid of the limitations of construction progress and realizing the adjustment and verification of indoor equipment when outdoor transmission conditions are not available.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows.

[0006] An outdoor equipment simulation device for track circuits includes a housing. A switch for controlling the device's on / off state is provided on the housing's panel. Inside the housing are a main rail signal transmission circuit for simulating the main rail signal transmission channel and a small rail signal transmission circuit for simulating the small rail signal transmission channel between adjacent sections. The main rail signal transmission circuit is connected to a digital signal processing module for collecting input and output voltage values ​​to determine the track circuit direction. The digital signal processing module is connected to a direction relay connected to the main rail signal transmission circuit, used to change the direction of the main rail signal in the main rail signal transmission channel under the drive of the digital signal processing module.

[0007] Preferably, the main rail signal transmission circuit includes a first main rail signal input / output terminal, a second main rail signal input / output terminal, a third main rail signal input / output terminal, a fourth main rail signal input / output terminal, and a transformer; the first main rail signal input / output terminal is connected to a mechanical shunt switch for simulating the rail condition, the second main rail signal input / output terminal is connected to a main rail potentiometer for adjusting the main rail input voltage, the mechanical shunt switch and the main rail potentiometer are also connected to the two ends of the primary coil of the transformer respectively, and the two ends of the secondary coil of the transformer are connected to the third main rail signal input / output terminal and the fourth main rail signal input / output terminal respectively.

[0008] Preferably, the small rail signal transmission circuit includes a first small rail signal input / output terminal, a second small rail signal input / output terminal, a third small rail signal input / output terminal, and a fourth small rail signal input / output terminal; the first small rail signal input / output terminal is connected between the second main rail signal input / output terminal and the main rail potentiometer; the second small rail signal input / output terminal is connected to a small rail potentiometer for adjusting the small rail input voltage, the small rail potentiometer is connected to a matching resistor, and the other end of the matching resistor is connected between the first main rail signal input / output terminal and the mechanical shunt switch; the third small rail signal input / output terminal is connected between the third main rail signal input / output terminal and the transformer; and the fourth small rail signal input / output terminal is connected between the fourth main rail signal input / output terminal and the transformer.

[0009] Preferably, the turns ratio of the primary coil to the secondary coil of the transformer is 22:1.

[0010] Preferably, both the main rail potentiometer and the minor rail potentiometer are adjustable resistors; the panel of the housing is provided with a main rail voltage adjustment knob connected to the main rail potentiometer and a minor rail voltage adjustment knob connected to the minor rail potentiometer.

[0011] Preferably, the panel of the housing is provided with a first connector for connecting external cables to the lightning protection simulation network device. Each first connector is connected to a first main rail signal input / output terminal, a second main rail signal input / output terminal, a third main rail signal input / output terminal, and a fourth main rail signal input / output terminal. The panel of the housing is also provided with a second connector for connecting external cables to the simulation device for setting up adjacent sections. The first and second small rail signal input / output terminals are connected to the third and fourth small rail signal input / output terminals to form a small rail signal transmission channel across sections. Each second connector is connected to a first, second, third, and fourth small rail signal input / output terminal.

[0012] Preferably, the panel of the housing is provided with a forward running indicator and a reverse running indicator, which are connected to the output terminal of the digital signal processing module and are used to indicate the direction of the track circuit.

[0013] Preferably, an analog switch is provided between the digital signal processing module and the direction relay.

[0014] Preferably, the digital signal processing module is connected to a power supply module for powering the analog device, and a switch is connected in series between the power supply module and the digital signal processing module.

[0015] Due to the adoption of the above technical solutions, the technical progress achieved by this invention is as follows.

[0016] This invention enables advanced and independent commissioning of indoor equipment: through internally integrated, independent main rail signal transmission circuits and secondary rail signal transmission circuits, it fully simulates the signal transmission and attenuation characteristics of outdoor equipment, constructing a realistic simulation test environment. This completely eliminates the dependence of indoor equipment commissioning on the installation progress of outdoor equipment and on-site construction conditions, allowing indoor and outdoor commissioning to be carried out in parallel, significantly shortening the overall project commissioning cycle.

[0017] This invention improves the accuracy and efficiency of commissioning through intelligent direction recognition and switching: A digital signal processing module automatically collects and compares the voltages at the main rail signal input and output sides, intelligently determines the running direction of the track circuit, and drives a direction relay to automatically switch the signal transmission path. This process is fully automated, replacing the traditional operation mode that relies on manual experience for complex track rerouting. It fundamentally eliminates potential equipment failures caused by human wiring errors, greatly improving the accuracy and reliability of commissioning work and reducing safety risks.

[0018] This invention features an integrated and modular design, offering convenient installation and strong compatibility: all functional circuits are highly integrated into a compact housing, resulting in a sophisticated structural design. The standardized first connector on the panel allows direct interface with existing lightning protection simulation network equipment, achieving "plug-and-play" modular installation. One unit is configured per section, and each standard housing can accommodate three units, perfectly compatible with existing railway signaling equipment architecture, requiring no modifications to existing cabinets.

[0019] This invention is intuitive and easy to operate, and features a safety protection mechanism: the main rail voltage adjustment knob and the small rail voltage adjustment knob on the panel allow the commissioning personnel to easily and accurately adjust the signal level. Forward and reverse running indicator lights provide intuitive visual feedback on the directional status. Simultaneously, the transformer in the main rail signal transmission circuit uses its primary coil impedance for current limiting, and a 22:1 turns ratio strictly limits the output voltage to below 10V, effectively protecting precision components such as the downstream indoor attenuator from high-voltage surges, thus enhancing the safety of the entire commissioning system.

[0020] This invention boasts low maintenance costs and significant economic benefits: the testing device extensively utilizes common standard components such as mechanical circuit breakers, potentiometers, and directional relays. When a component fails, it can be quickly located and partially replaced without scrapping the entire device, greatly reducing subsequent maintenance costs and downtime, resulting in significant economic benefits. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram illustrating the principle of the present invention; Figure 3 This is a schematic diagram of the connection of the simulation device for adjacent sections when using the present invention.

[0022] The components are as follows: 1. First main rail signal input / output terminal; 2. Second main rail signal input / output terminal; 3. Third main rail signal input / output terminal; 4. Fourth main rail signal input / output terminal; B. Transformer; K. Mechanical shunt switch; R1. Main rail potentiometer; E1. First small rail signal input / output terminal; E2. Second small rail signal input / output terminal; E3. Third small rail signal input / output terminal; E4. Fourth small rail signal input / output terminal; R2. Small rail potentiometer; R. Matching resistor; FQJ. Direction relay; DSP. Digital signal processing module; 100. Housing; 101. Switch; 102. Main rail voltage adjustment knob; 103. Small rail voltage adjustment knob; 104. First connector; 105. Forward running indicator light; 106. Reverse running indicator light; 107. Analog switch; 108. Power supply module. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] A simulation device for outdoor equipment of track circuit, combined with Figures 1 to 2As shown, the system includes a housing 100, inside which are arranged a main rail signal transmission circuit and a secondary rail signal transmission circuit. The main rail signal transmission circuit is used to simulate the main rail signal transmission channel; the secondary rail signal transmission circuit is used to simulate the secondary rail signal transmission channel between adjacent sections. The main rail signal transmission circuit is connected to a digital signal processing module (DSP). The DSP is used to acquire the voltage values ​​on the input and output sides of the main rail signal transmission circuit and determine the direction of the track circuit by comparing the magnitudes of the voltage values ​​on the input and output sides. The DSP is also connected to a directional relay (FQJ), which is also connected to the main rail signal transmission circuit. The directional relay (FQJ) is used to change the direction of the main rail signal in the main rail signal transmission channel under the drive of the DSP.

[0025] The main rail signal transmission circuit includes a first main rail signal input / output terminal 1, a second main rail signal input / output terminal 2, a third main rail signal input / output terminal 3, a fourth main rail signal input / output terminal 4, and a transformer B. The first main rail signal input / output terminal 1 is connected to a mechanical shunt switch K, which simulates the rail's state: when the mechanical shunt switch K is closed, it simulates the adjustment state of the track circuit; when the mechanical shunt switch K is open, it simulates the shunt state of the track circuit. The second main rail signal input / output terminal 2 is connected to a main rail potentiometer R1, which is used to adjust the main rail input voltage: by changing the resistance value, the input voltage of the main rail signal is precisely attenuated. The shunt switch K and the main rail potentiometer R1 are also connected to the two ends of the primary coil of transformer B, forming a signal circuit. The two ends of the secondary coil of transformer B are connected to the third main rail signal input / output terminal 3 and the fourth main rail signal input / output terminal 4, respectively. Transformer B is a key protection device in this circuit, and the turns ratio of the primary coil to the secondary coil of transformer B is 22:1. Transformer B uses the impedance of the primary coil to limit the current in the circuit, preventing large current from damaging the potentiometer R1 in the preceding stage. At the same time, with its 22:1 turns ratio, it converts the higher voltage signal of the primary coil into a low-voltage safety signal of the secondary coil (ensuring that the output voltage is ≤10V), thereby reliably protecting the attenuator components connected in the following stage from damage.

[0026] The small rail signal transmission circuit includes a first small rail signal input / output terminal E1, a second small rail signal input / output terminal E2, a third small rail signal input / output terminal E3, and a fourth small rail signal input / output terminal E4. The first small rail signal input / output terminal E1 is connected between the second main rail signal input / output terminal 2 and the main rail potentiometer R1. The second small rail signal input / output terminal E2 is connected to a small rail potentiometer R2, which is used to adjust the small rail input voltage. A matching resistor R is connected to the small rail potentiometer R2 to achieve impedance matching, thereby ensuring the stability of signal transmission. The other end of the matching resistor R is connected between the first main rail signal input / output terminal 1 and the mechanical shunt switch K. The third small rail signal input / output terminal E3 is connected between the third main rail signal input / output terminal 3 and the transformer B. The fourth small rail signal input / output terminal E4 is connected between the fourth main rail signal input / output terminal 4 and the transformer B. Taking forward operation as an example, the track signal of the rear section is output from its first track signal input / output terminal E1 and second track signal input / output terminal E2, and connected to the third track signal input / output terminal E3 and the fourth track signal input / output terminal E4 of this section via cables. After attenuation within this section, it is output again from the first track signal input / output terminal E1 and the second track signal input / output terminal E2 of this section and sent to the front section. This forms a complete cross-section track signal transmission channel.

[0027] An analog switch 107 is installed between the digital signal processing module (DSP) and the direction relay FQJ. The DSP itself integrates analog-to-digital conversion (ADC) functionality, and its multiple ADC sampling channels are directly connected to each terminal via a signal conditioning circuit for acquiring voltage values. Specifically, the DSP's ADC sampling channels are connected to the first main rail signal input / output terminal 1 and the second main rail signal input / output terminal 2, and the third main rail signal input / output terminal 3 and the fourth main rail signal input / output terminal 4, respectively, via a first voltage divider circuit and a second voltage divider circuit. The signal conditioning circuit includes a voltage divider circuit for proportionally attenuating the high-voltage signal to the safe input range of the ADC, and an RC low-pass filter for filtering out high-frequency interference. Specifically, the digital signal processing module (DSP) uses Texas Instruments' TMS320F28335, whose built-in 12-bit or higher precision ADC can meet the accuracy requirements of voltage acquisition. The DSP compares the two sets of acquired digital voltage values ​​in real time through its internal program to determine the running direction of the track circuit and control subsequent circuits accordingly. Specifically, it controls the drive circuit of the direction relay FQJ coil via analog switch 107, thereby driving the direction relay FQJ to operate, as detailed below: When the voltage at the first main rail signal input / output terminal 1 and the second main rail signal input / output terminal 2 is greater than the voltage at the third main rail signal input / output terminal 3 and the fourth main rail signal input / output terminal 4: The drive direction relay FQJ is energized; The first main rail signal input / output terminal 1 and the second main rail signal input / output terminal 2 are the main rail signal input terminals, i.e., power output terminals. The third main rail signal input / output terminal 3 and the fourth main rail signal input / output terminal 4 are the main rail signal output terminals, i.e., rail input.

[0028] When the voltage at the third main rail signal input / output terminal 3 and the fourth main rail signal input / output terminal 4 is greater than the voltage at the first main rail signal input / output terminal 1 and the second main rail signal input / output terminal 2: The drive direction relay FQJ drops; The third main rail signal input / output terminal 3 and the fourth main rail signal input / output terminal 4 are the main rail signal input terminals, i.e., power output terminals. The first main rail signal input / output terminal 1 and the second main rail signal input / output terminal 2 are the main rail signal output terminals, i.e., rail input.

[0029] The digital signal processing module (DSP) is connected to a power supply module (108), which is used to power the analog device. Specifically, the power supply module (108) uses a 24V DC power input.

[0030] A switch 101 is provided on the panel of the housing 100. The switch 101 is connected in series between the power supply module 108 and the digital signal processing module DSP and is used to control the opening and closing of the device.

[0031] The housing 100 has a main rail voltage adjustment knob 102 and a minor rail voltage adjustment knob 103 on its panel. The main rail voltage adjustment knob 102 is connected to the main rail potentiometer R1, and the minor rail voltage adjustment knob 103 is connected to the minor rail potentiometer R2. Both the main rail potentiometer R1 and the minor rail potentiometer R2 are adjustable resistors. The resistance values ​​of the main rail potentiometer R1 and the minor rail potentiometer R2 can be adjusted by the main rail voltage adjustment knob 102 and the minor rail voltage adjustment knob 103, so that the commissioning personnel can easily simulate the main rail input voltage and minor rail input voltage under different cable lengths and transmission losses.

[0032] The housing 100 has a first connector 104 on its front panel. Each first connector 104 is connected to a first main rail signal input / output terminal 1, a second main rail signal input / output terminal 2, a third main rail signal input / output terminal 3, and a fourth main rail signal input / output terminal 4. The first connector 104 is used to connect external cables to the lightning protection simulation network equipment.

[0033] The housing 100 also has a second connector on its panel. Each second connector is connected to a corresponding terminal of the first rail signal input / output E1, the second rail signal input / output E2, the third rail signal input / output E3, and the fourth rail signal input / output E4. The second connector is used to connect external cables to connect the first rail signal input / output terminals E1 and E2, the third rail signal input / output terminals E3, and the fourth rail signal input / output terminals E4 of the analog device with adjacent sections, thereby forming a rail signal transmission channel across sections.

[0034] The housing 100 has a forward running indicator light 105 and a reverse running indicator light 106 on its panel. These two indicators are connected to the output terminals of the digital signal processing module (DSP) and are used to indicate the direction of the track circuit. Specifically, when the DSP detects that the voltage at the first main rail signal input / output terminal 1 and the second main rail signal input / output terminal 2 is greater than the voltage at the third main rail signal input / output terminal 3 and the fourth main rail signal input / output terminal 4, the forward running indicator light 105 illuminates; when the DSP detects that the voltage at the third main rail signal input / output terminal 3 and the fourth main rail signal input / output terminal 4 is greater than the voltage at the first main rail signal input / output terminal 1 and the second main rail signal input / output terminal 2, the reverse running indicator light 106 illuminates.

[0035] This simulation device adopts a cuboid structure with dimensions of 160mm × 130mm × 68mm (length × width × height). It is installed inside the lightning protection simulation network housing of the interface cabinet, using the same installation method as the existing lightning protection simulation network devices on the high-speed railway. One unit is used per section, and three units can be placed in each standard housing. This simulation device features a compact design. Through 3D modeling technology and optimized component selection, the device's structural dimensions are reasonably reduced to meet the space requirements for installation within the lightning protection simulation network housing. The internal structure of this simulation device is simple and uses universal standard parts. When an internal component is damaged, local maintenance or replacement can be performed quickly, reducing maintenance costs.

[0036] In use, the main rail signal transmission circuit connects its two output terminals to the transmitting end of the lightning protection simulation network equipment and its two input terminals to the receiving end of the lightning protection simulation network equipment. The main rail signal is adjusted by adjusting the main rail voltage adjustment knob 102 on the panel of the housing 100. Taking the forward direction as an example, the small rail signal is output from the first small rail signal input / output terminal E1 and the second small rail signal input / output terminal E2 in the rear section, and input through the third small rail signal input / output terminal E3 and the fourth small rail signal input / output terminal E4 in this section; the output from the first small rail signal input / output terminal E1 and the second small rail signal input / output terminal E2 in this section is input to the interface of the third small rail signal input / output terminal E3 and the fourth small rail signal input / output terminal E4 in the front section. The small rail signal is adjusted by adjusting the small rail voltage adjustment knob 103 on the panel of the housing 100. Example 1

[0037] Taking three adjacent sections in a lightning protection simulation network box as an example, the connection and usage of the simulation device are explained: Taking the positive direction as an example, such as Figure 3 As shown, 1G, 2G, and 3G are three adjacent segments. The transmitting end lightning protection simulation network equipment of each segment is connected to the first main rail signal input / output terminal 1 and the second main rail signal input / output terminal 2 of the corresponding segment's simulation device. The receiving end lightning protection simulation network equipment is connected to the third main rail signal input / output terminal 3 and the fourth main rail signal input / output terminal 4 of the corresponding segment's simulation device. The third minor rail signal input / output terminal E3 and the fourth minor rail signal input / output terminal E4 of the 1G simulation device are connected to the first minor rail signal input / output terminal E1 and the second minor rail signal input / output terminal E2 of the 2G simulation device. The third minor rail signal input / output terminal E3 and the fourth minor rail signal input / output terminal E4 of the 2G simulation device are connected to the first minor rail signal input / output terminal E1 and the second minor rail signal input / output terminal E2 of the 3G simulation device.

[0038] Detailed debugging examples: Taking 1G power output level as 3 levels, 2G power output level as 5 levels, and 3G power output level as 7 levels as examples.

[0039] Main rail signal adjustment: 1G selects the main rail potentiometer R1 via the main rail voltage adjustment knob 102 of the analog device, and can output the rail input voltage range of approximately 1.30V to 6.20V; 2G selects the main rail potentiometer R1 via the main rail voltage adjustment knob 102 of the analog device, and can output the rail input voltage range of approximately 0.78V to 3.55V. 3G uses the main rail voltage adjustment knob 102 of the analog device to select the main rail potentiometer R1, and can output the rail input voltage range of approximately 0.57V to 2.60V.

[0040] Small rail signal adjustment: Since there is no small track signal at 1G, no adjustments will be made to it; 2G selects the small rail potentiometer R2 through the small rail voltage adjustment knob 103 of the analog device, and the output small rail input voltage range is approximately 65mV to 388mV; 3G uses the analog device's small rail voltage adjustment knob 103 to select the small rail potentiometer R2, with the output small rail input voltage range being approximately 47mV to 284mV, and the reverse is also true.

[0041] After the main rail and secondary rail signals are debugged, the output voltage of the main rail and secondary rail can be tested and verified at the attenuator plug hole.

Claims

1. A track circuit outdoor equipment simulation device, comprising a housing (100), wherein a switch (101) for controlling the opening and closing of the device is provided on the panel of the housing (100), characterized in that: The housing (100) is internally equipped with a main rail signal transmission circuit for simulating the construction of the main rail signal transmission channel and a small rail signal transmission circuit for simulating the construction of the small rail signal transmission channel between adjacent sections; the main rail signal transmission circuit is connected to a digital signal processing module (DSP) for collecting the voltage values ​​of the input and output sides of the main rail signal transmission circuit to determine the direction of the track circuit; the digital signal processing module (DSP) is connected to a direction relay (FQJ) connected to the main rail signal transmission circuit for changing the direction of the main rail signal in the main rail signal transmission channel under the drive of the digital signal processing module (DSP).

2. The track circuit outdoor equipment simulation device according to claim 1, characterized in that: The main rail signal transmission circuit includes a first main rail signal input / output terminal (1), a second main rail signal input / output terminal (2), a third main rail signal input / output terminal (3), a fourth main rail signal input / output terminal (4), and a transformer (B). The first main rail signal input / output terminal (1) is connected to a mechanical shunt switch (K) for simulating the rail condition. The second main rail signal input / output terminal (2) is connected to a main rail potentiometer (R1) for adjusting the main rail input voltage. The mechanical shunt switch (K) and the main rail potentiometer (R1) are also connected to the two ends of the primary coil of the transformer (B). The two ends of the secondary coil of the transformer (B) are connected to the third main rail signal input / output terminal (3) and the fourth main rail signal input / output terminal (4), respectively.

3. The track circuit outdoor equipment simulation device according to claim 2, characterized in that: The small rail signal transmission circuit includes a first small rail signal input / output terminal (E1), a second small rail signal input / output terminal (E2), a third small rail signal input / output terminal (E3), and a fourth small rail signal input / output terminal (E4). The first small rail signal input / output terminal (E1) is connected between the second main rail signal input / output terminal (2) and the main rail potentiometer (R1). The second small rail signal input / output terminal (E2) is connected to a small rail potentiometer (R2) for adjusting the small rail input voltage. The small rail potentiometer (R2) is connected to a matching resistor (R). The other end of the matching resistor (R) is connected between the first main rail signal input / output terminal (1) and the mechanical shunt switch (K). The third small rail signal input / output terminal (E3) is connected between the third main rail signal input / output terminal (3) and the transformer (B). The fourth small rail signal input / output terminal (E4) is connected between the fourth main rail signal input / output terminal (4) and the transformer (B).

4. The track circuit outdoor equipment simulation device according to claim 2, characterized in that: The primary coil to secondary coil of the transformer (B) has a turns ratio of 22:

1.

5. The track circuit outdoor equipment simulation device according to claim 2, characterized in that: Both the main rail potentiometer (R1) and the small rail potentiometer (R2) are adjustable resistors; the panel of the housing (100) is provided with a main rail voltage adjustment knob (102) connected to the main rail potentiometer (R1) and a small rail voltage adjustment knob (103) connected to the small rail potentiometer (R2).

6. The track circuit outdoor equipment simulation device according to claim 2, characterized in that: The panel of the housing (100) is provided with a first plug-in interface (104) for connecting external cables to the lightning protection simulation network equipment. Each first plug-in interface (104) is connected to the first main rail signal input / output terminal (1), the second main rail signal input / output terminal (2), the third main rail signal input / output terminal (3), and the fourth main rail signal input / output terminal (4) in a one-to-one correspondence. The panel of the housing (100) is also provided with a second plug-in interface for connecting external cables to the simulation device for setting up adjacent sections. The first small rail signal input / output terminal (E1), the second small rail signal input / output terminal (E2), the third small rail signal input / output terminal (E3), and the fourth small rail signal input / output terminal (E4) are connected to form a small rail signal transmission channel across sections. Each second plug-in interface is connected to the first small rail signal input / output terminal (E1), the second small rail signal input / output terminal (E2), the third small rail signal input / output terminal (E3), and the fourth small rail signal input / output terminal (E4) in a one-to-one correspondence.

7. The track circuit outdoor equipment simulation device according to claim 1, characterized in that: The housing (100) has a forward running indicator (105) and a reverse running indicator (106) connected to the output of a digital signal processing module (DSP) for indicating the direction of the track circuit.

8. The track circuit outdoor equipment simulation device according to claim 1, characterized in that: An analog switch (107) is provided between the digital signal processing module (DSP) and the direction relay (FQJ).

9. The track circuit outdoor equipment simulation device according to claim 1, characterized in that: The digital signal processing module (DSP) is connected to a power supply module (108) for powering the analog device, and a switch (101) is connected in series between the power supply module (108) and the digital signal processing module (DSP).

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