Method and device for detecting electronic switch board of direct current track circuit

Abstract

The invention relates to the technical field of railway signal detection, and discloses a method and device for detecting an electronic switch board of a direct-current track circuit, and the method comprises the following steps: S1, track section state confirmation, S2, detection mode switching, S3, fault state judgment, S4, detection mode resetting, and S5, reset state confirmation. Through closed-loop step algorithm linkage of S1-S5 and circuit logic linkage of a conversion mechanism and a display mechanism, a traditional outdoor detection mode is changed, S2 needs to be started based on the S1 without a train set result, S4 needs to complete operation according to S3 judgment, and the steps are strongly dependent; the switching mechanism switches the indoor and outdoor modes in an on-off mode, the display mechanism feeds back the state, seven risks such as outdoor vehicle injury and molten iron scalding are eliminated, the detection time of 40 switch plates in the whole station is shortened to 2 minutes from 2 hours, and safety and efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of railway signal detection, in particular to a method and device for detecting a DC track circuit electronic switch board. BACKGROUND

[0002] The safety protection type DC electronic switch type track circuit is a device suitable for complex environment railway signal control system of industrial and mining enterprises, and its structure mainly includes outdoor power supply equipment (power supply part rail), power receiving equipment (core is electronic switch board) and indoor receiving equipment (track relay) three parts. This type of track circuit has the characteristics of strong environmental interference resistance, high shunt sensitivity, and less routine maintenance, and has lightning protection, strong current impact protection and mixed line protection functions.

[0003] In the prior art, the detection of the core component of the safety protection type DC electronic switch type track circuit, the electronic switch board, is mainly realized by two ways: one is vehicle shunt detection, when the train occupies the track section, the detection power supply passes through the negative electric circuit to break through the B1 (IN2AP9) diode in the electronic switch board, so as to detect whether the electronic switch board has a short circuit fault; the second is manual shunt detection, when there is no train occupation, point inspection personnel (2 people in a group) or maintenance personnel (5-8 people in a group) are arranged to the line box outside the open track, and the positive and negative electricity of the electronic switch board in the shunt track surface or shunt box is used to complete the fault detection. Both detection methods rely on the characteristics of the protection power supply (GZ20V, GF20V) having voltage supply when the electronic switch board is short-circuited, and the fault is judged by the on-off of the detection circuit.

[0004] The most critical deficiency in the prior art is that the detection of the electronic switch board completely depends on the vehicle shunt or manual field shunt operation in the outdoor scene, which cannot realize remote detection in the indoor safe environment, resulting in that the detection operation must be exposed to the complex risk environment of outdoor vehicle injury, iron burn, coal gas poisoning, etc., and the detection of branch lines and less train sections is not timely, which is difficult to balance the safety and efficiency of detection. In view of this, we propose a method and device for detecting a DC track circuit electronic switch board. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a method and device for detecting a DC track circuit electronic switch board, which solves the problem that the detection of the electronic switch board completely depends on the vehicle shunt or manual field shunt operation in the outdoor scene, which cannot realize remote detection in the indoor safe environment, which not only exposes the operation to the outdoor risk, but also causes the detection of branch lines and less train sections to be not timely.

[0006] In order to achieve the above object, the present application is implemented by the following technical solutions: A method and device for detecting a DC track circuit electronic switch board, comprising the following steps: S1, track section state confirmation step: confirming that there is no train occupying the track section corresponding to the DC track circuit; S2, detection mode switching step: based on the result of confirming that there is no train occupying the track section in S1, operating the switching mechanism arranged indoors to make the switching mechanism disconnect the normally closed contact and connect the normally open contact, switch the detection mode of the DC track circuit electronic switch board from the outdoor detection mode to the indoor detection mode, and turn on the indoor detection loop; S3, fault state judgment step: based on the indoor detection loop turned on in S2, obtaining the state information of the display mechanism through the display mechanism connected in series with the switching mechanism in the indoor detection loop, and judging the short circuit condition of the triode in the DC track circuit electronic switch board according to the state information of the display mechanism; S4, detection mode resetting step: based on the result of completing the fault state judgment in S3, operating the switching mechanism to make the switching mechanism disconnect the normally open contact and connect the normally closed contact, switch the detection mode of the DC track circuit electronic switch board from the indoor detection mode back to the outdoor detection mode, and disconnect the indoor detection loop; S5, reset state confirmation step: based on the detection mode resetting operation in S4, confirming that the indoor detection loop has been disconnected through the state information of the display mechanism.

[0007] Preferably, in S1, the way to confirm that there is no train occupying the track section is to observe the pulled-up state of the indoor track relay, and if the track relay remains pulled up, it is determined that there is no train occupying the track section.

[0008] Preferably, in S2, the switching mechanism is a button switch, and the specific process of operating the button switch is to apply an external force to the button switch to first disconnect the normally closed contact of the button switch, and then continue to apply the external force to make the normally open contact of the button switch connected, in S2, the circuit path of the indoor detection loop is: the positive pole of the protection power supply of the DC track circuit→the triode in the electronic switch board→the cable core wire→the normally open contact of the switching mechanism→the display mechanism→the negative pole of the protection power supply, forming a complete current path.

[0009] Preferably, in S3, the display mechanism includes a light-emitting diode and a current limiting resistor connected in series with the light-emitting diode, and the current limiting resistor is arranged between the light-emitting diode and the negative pole of the protection power supply, in S3, the specific way to judge according to the state information of the display mechanism is: if the light-emitting diode is in the lighted state, it is determined that the triode in the DC track circuit electronic switch board has a short circuit; if the light-emitting diode is in the extinguished state, it is determined that the triode in the DC track circuit electronic switch board has no short circuit.

[0010] Preferably, in the S4, the specific process of operating the conversion mechanism is that a reverse external force is applied to the conversion mechanism to make the normally open contact of the conversion mechanism disconnect first, and then the reverse external force is continuously applied to make the normally closed contact of the conversion mechanism connect later. In the S4, after the reset of the conversion mechanism, the normally closed contact of the conversion mechanism needs to be kept in the connected state until the next detection operation is started.

[0011] Preferably, in the S5, the specific way of confirming that the indoor detection circuit has been disconnected is that if the light-emitting diode in the display mechanism is in an off state, it is determined that the indoor detection circuit has been disconnected; if the light-emitting diode is in an on state, the detection mode reset step of the S4 is re-executed.

[0012] A device for detecting a DC track circuit electronic switch board, comprising a conversion mechanism and a display mechanism, the conversion mechanism and the display mechanism cooperate to form an indoor detection circuit; The conversion mechanism is arranged indoors and is electrically connected with a protective power supply of the DC track circuit and a GK cable core wire of the electronic switch board, and is used for switching an outdoor detection mode and an indoor detection mode of the DC track circuit electronic switch board, the outdoor detection mode relies on a vehicle occupying a track section shunt or a manual shunt track surface, a shunt box electronic switch board receiving positive and negative electricity to realize detection; The display mechanism is in series with the conversion mechanism and is electrically connected with a negative electrode of the protective power supply or a negative electrode of an auxiliary power supply, and is used for presenting a short-circuit state of the electronic switch board and feeding back whether the indoor detection circuit is conducted through a state change of itself; The indoor detection circuit is jointly formed by the conversion mechanism, the display mechanism, the protective power supply and the electronic switch board, and the indoor detection circuit is independent of an original working circuit of the DC track circuit, and does not affect an original working logic of the DC track circuit in a section idle, occupied or fault state.

[0013] Preferably, the conversion mechanism is a button switch MK, the button switch MK is installed in an indoor distribution cabinet, and each DC track circuit electronic switch board is correspondingly provided with one button switch MK; the button switch MK has a normally closed contact and a normally open contact, in a normal state, the normally closed contact keeps in a connected state and the normally open contact keeps in a disconnected state, at this time, the button switch MK is electrically connected with an outdoor detection circuit of the DC track circuit to ensure that the outdoor detection mode normally operates; when indoor detection is needed, the button switch MK is manually operated to make the normally closed contact disconnect and the normally open contact connect, so as to switch the detection mode from the outdoor detection mode to the indoor detection mode, and to connect the indoor detection circuit formed by the conversion mechanism, the display mechanism, the protective power supply and the electronic switch board.

[0014] Preferably, the display mechanism comprises a light emitting diode (LED) and a current-limiting resistor (R5), the LED and the current-limiting resistor (R5) are connected in series to form a series assembly, and each DC track circuit electronic switch board is correspondingly provided with one series assembly; one end of the series assembly is electrically connected to the end of the conversion mechanism away from the GK cable core, and the other end is electrically connected to the negative pole GF26V of the auxiliary power supply; the current-limiting resistor (R5) is arranged between the LED and the negative pole GF26V of the auxiliary power supply, and has a resistance of 1kΩ and a power of 1 / 4W, for limiting the current size in the indoor detection loop and avoiding damage to the LED caused by excessive current; the LED is a red high-brightness type, and a mark is arranged beside the LED, the mark marks the track section number to which the corresponding electronic switch board belongs, so as to facilitate the staff to quickly identify the detection results of the electronic switch boards of different track sections; the protection power supply of the DC track circuit comprises a positive pole GZ20V and a negative pole GF20V, and the current path when the indoor detection loop is turned on is: the positive pole GZ20V of the protection power supply→the Q1 triode of the electronic switch board→the GK cable core→the normally open contact of the conversion mechanism→the current-limiting resistor (R5) of the display mechanism→the LED of the display mechanism→the negative pole GF26V of the auxiliary power supply, forming a complete current path.

[0015] Preferably, when automatic timing cycle detection needs to be realized, the conversion mechanism is provided as a programmable contact of a programmable logic controller (PLC), and the programmable contact is electrically connected to the protection power supply of the DC track circuit, the GK cable core of the electronic switch board and the display mechanism; the programmable contact realizes on-off control through a preset program, and realizes timing cycle scanning switching at a set time interval, and converts between the outdoor detection mode and the indoor detection mode, so that uninterrupted detection of the electronic switch board can be realized without manual operation; when the DC track circuit comprises multiple electronic switch boards, the conversion mechanism and the display mechanism corresponding to each electronic switch board are independently configured, respectively, to form an indoor detection loop of the corresponding electronic switch board, the indoor detection loops do not interfere with each other, and each electronic switch board is independently detected without affecting the detection results.

[0016] The application provides a method and device for detecting a DC track circuit electronic switch board. 1. The application changes the traditional outdoor detection mode by the closed-loop step algorithm linkage of "track section state confirmation S1-detection mode switching S2-fault state judgment S3-detection mode reset S4-reset state confirmation S5", combined with the circuit logic linkage of the conversion mechanism and the display mechanism, S2 needs to be started based on the no-car result of S1, S4 needs to be operated according to the judgment of S3, and the steps are strongly dependent; the conversion mechanism switches the indoor and outdoor modes, and the display mechanism feeds back the state, which not only eliminates seven risks such as outdoor vehicle damage and hot water burns, but also shortens the detection time of the 40 switch boards of the total station from the original 2 hours to 2 minutes, improving safety and efficiency.

[0017] 2. The application realizes the algorithm linkage of the electronic switch board short circuit detection logic and the indoor detection circuit, relies on the causal chain of "Q1 / Q2 / Q3 short circuit→protective power supply (GZ20V / GF20V) conduction→indoor detection circuit power on→light emitting diode lighting", couples the working principle of the electronic switch board and the detection circuit, and ensures that no fault is missed; S5 realizes 100% detection accuracy by confirming that the circuit is disconnected through the extinguishing of the light emitting diode, and the detection circuit is independent of the original track circuit, does not affect the normal absorption of the track relay, and guarantees transportation.

[0018] 3. The application realizes the mode algorithm linkage of the conversion mechanism "manual (button switch) and automatic (PLC)", adapts to different scenes, in the manual mode, the button switch is operated by external force to realize the on-off of the contact points in sequence, and the branch line is detected as needed; in the automatic mode, the PLC cyclically scans the switching mode according to the preset program, reads the state of the display mechanism, and does not need manual intervention, the two modes share the detection circuit, only the type of the conversion mechanism is changed, the complexity of the transformation is reduced, and the blank of the remote detection of the DC track circuit switch board in the prior art is filled. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The method flowchart of the detection DC track circuit electronic switch board is shown in the figure; Figure 2 The safety protection type DC electronic switch type track circuit structure schematic diagram is shown in the figure; Figure 3 The existing technology detection electronic switch board circuit diagram is shown in the figure; Figure 4 The detection electronic switch board circuit diagram of the application is shown in the figure. DETAILED DESCRIPTION

[0020] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be described clearly and completely in the specification of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work, fall within the protection scope of the present application. Embodiments

[0021] Please refer to the accompanying drawings Figure 1 - the accompanying drawings Figure 4 The embodiments of the present application provide a method and device for detecting a DC track circuit electronic switch board, comprising the following steps: S1, track section state confirmation step: confirming that there is no train occupying in the track section corresponding to the DC track circuit; In the S1, the way of confirming that there is no train occupying in the track section is: observing the attracted state of the indoor track relay, and if the track relay keeps attracting, it is determined that there is no train occupying in the track section; For example, taking the 801 track section (mainly used for transferring the molten iron tank car, the track length is 150m) in the steelmaking area of a metallurgical steel plant as an example, after the inspection personnel enter the indoor relay room, the track relay (model JWXC-1700) corresponding to the 801 section is positioned. First, observe the physical state of the relay: the relay armature keeps attracting state, and there is no drooping or shaking; at the same time, check the green state indicating lamp matched with the relay panel, and the indicating lamp keeps lighting and has no flicker. If the inspection personnel have doubts about the state (such as abnormal brightness of the indicating lamp), immediately contact the on-site shunting operator through the indoor dispatching telephone, confirm that there is no molten iron tank car or other operating vehicle occupying in the 801 section, and finally determine that there is no train occupying in the 801 track section, and the next step of detection can be entered; S2, detection mode switching step: based on the confirmation result of the track section without train occupying in the S1, operating the switching mechanism arranged in the indoor to make the switching mechanism disconnect the normally closed contact and connect the normally open contact, switch the detection mode of the DC track circuit electronic switch board from the outdoor detection mode to the indoor detection mode, and connect the indoor detection loop; The conversion mechanism is a button switch in S2. The specific process of operating the button switch is: an external force is applied to the button switch, so that the normally closed contact of the button switch is first disconnected, and then the normally open contact of the button switch is connected by continuously applying the external force. In S2, the circuit path of the indoor detection circuit is: the positive pole of the protection power supply of the DC track circuit→the triode in the electronic switch board→the cable core wire→the normally open contact of the conversion mechanism→the display mechanism→the negative pole of the protection power supply, forming a complete current path. According to the working principle of the electronic switch board, if Q1, Q2 and Q3 switches are short-circuited, the protection power supply (GZ20V, GF20V) has a voltage supply. One path flows from Q1 to the GK cable core wire to the indoor track relay coil 4; one path flows to B1 (IN2AP9), Q3, the negative rail voltage (GWF), the cable core wire, to the negative rail transformer box (connected to the GKF terminal of the indoor relay), thereby realizing detection. For example, based on the "801 section no vehicle occupancy" result confirmed in S1, the point inspection personnel find the conversion mechanism corresponding to the 801 section in the indoor distribution cabinet, which is the button switch MK1 (identified as "801-MK"). When operating, a horizontal right external force (force value about 5-8N) is applied to MK1 with fingers: first, the "first gear" feedback inside the switch is felt, at this time the normally closed contact (connected to the outdoor detection circuit) of MK1 is disconnected, and the outdoor detection mode depending on the vehicle branch is paused; continue to apply the same external force to the "second gear" and hear the "click" locking sound, the normally open contact of MK1 is connected, and the indoor detection circuit is formally connected. The specific current path of the circuit is: the positive pole of the protection power supply GZ20V of the DC track circuit→the Q1 triode in the 801 section outdoor electronic switch board→the 1.5mm² copper core GK1 cable core wire→the normally open contact of MK1→the display mechanism (LD1 light emitting diode+R5-1 current limiting resistor) corresponding to the 801 section→the negative pole of the protection power supply GF20V, forming a complete current path. At this time, if there is a short circuit in Q1, Q2 and Q3 of the 801 section electronic switch board, the protection power supply GZ20V will continuously supply voltage. In addition to the above indoor detection circuit, another path of voltage will flow from Q1 to the GK1 cable core wire to the indoor track relay coil 4, and at the same time, another path will flow to the B1 (IN2AP9) diode, Q3 triode and negative rail voltage GWF in the outdoor electronic switch board, which is connected to the negative rail transformer box (connected to the GKF terminal of the indoor relay) through another cable core wire, providing a circuit basis for subsequent fault judgment.

[0022] S3, fault state judgment step: based on the indoor detection circuit connected in S2, the state information of the display mechanism is obtained through the display mechanism connected in series with the conversion mechanism in the indoor detection circuit, and the short circuit condition of the triode in the DC track circuit electronic switch board is judged according to the state information of the display mechanism; The display mechanism includes a light emitting diode and a current limiting resistor connected in series with the light emitting diode, and the current limiting resistor is arranged between the light emitting diode and the negative electrode of the protection power supply, and the specific manner of judging the state information of the display mechanism is that if the light emitting diode is in the lighting state, it is judged that the triode in the DC track circuit electronic switch board exists short circuit; if the light emitting diode is in the extinguishing state, it is judged that the triode in the DC track circuit electronic switch board does not exist short circuit; For example, based on the S2 on 801 section indoor detection loop, the point inspection personnel focus on the corresponding display mechanism: the display mechanism is composed of a red highlight LD1 light emitting diode and a 1kΩ R5-1 current limiting resistor connected in series, and the R5-1 is fixed between the LD1 and the negative electrode of the protection power supply GF20V. The point inspection personnel first observe the LD1 state: if the LD1 is continuously lit (the brightness is clear and visible, and there is no bright and dark flicker), combined with the working principle of the electronic switch board, it is judged that at least one of Q1, Q2 and Q3 triodes in the 801 section electronic switch board exists short circuit (at this time, the protection power supply voltage passes through the short-circuit triode to construct the indoor detection loop, and drives the LD1 to emit light); if the LD1 remains in the extinguishing state, the multimeter (the position is adjusted to the DC 20mA position) is connected in series to detect the loop, and the measurement result shows that the current is 0mA, it is judged that Q1, Q2 and Q3 triodes in the 801 section electronic switch board have no short circuit, and the switch board state is normal. For example, in this detection, the LD1 is continuously lit, and the subsequent disassembly of the outdoor electronic switch board verifies that the collector and the emitter of the Q1 triode are short-circuited due to high temperature, which is consistent with the indoor detection result; S4, detection mode reset step: based on the fault state judgment result of S3, the operation conversion mechanism is operated to make the conversion mechanism disconnect the normally open contact and connect the normally closed contact, and the detection mode of the DC track circuit electronic switch board is switched from the indoor detection mode to the outdoor detection mode, and the indoor detection loop is disconnected; In the S4, the specific process of operating the conversion mechanism is that a reverse external force is applied to the conversion mechanism to make the normally open contact of the conversion mechanism disconnect first, and then the reverse external force is continuously applied to make the normally closed contact of the conversion mechanism connect later, and in the S4, after the conversion mechanism is reset, the normally closed contact of the conversion mechanism needs to be kept in the connected state until the next detection operation is started; For example, based on the S3 confirmation of the "801 section electronic switchboard Q1 short circuit" judgment result, the point inspector starts to operate MK1 to perform reset. When operating, a horizontal left reverse external force (force value about 5-8N) is applied to MK1: first, the "first gear" feedback is felt, the normally open contact of MK1 is disconnected, and the indoor detection circuit is cut off; continue to apply the reverse external force to the "second gear" and lock it, the normally closed contact of MK1 is reconnected, and the detection mode of the 801 section electronic switchboard is switched from the indoor detection mode back to the outdoor detection mode (restoring the vehicle shunt detection function). After resetting, the point inspector fixes the MK1 gear through the spring buckle on the distribution cabinet panel to ensure that the normally closed contact of MK1 remains connected, until the next 801 section detection operation at 9 o'clock the next day. During this period, if a train enters the 801 section, the outdoor detection mode can normally pass through the vehicle shunt to achieve fault detection, without affecting the normal operation of the track circuit; S5, reset state confirmation step: based on the detection mode reset operation of S4, the state information of the display mechanism is used to confirm that the indoor detection circuit has been disconnected; In S5, the specific way to confirm that the indoor detection circuit has been disconnected is: if the light-emitting diode in the display mechanism is in an extinguished state, it is determined that the indoor detection circuit has been disconnected; if the light-emitting diode is in a lit state, the detection mode reset step of S4 is re-executed; For example, based on the reset operation of MK1 in S4, the point inspector observes the LD1 state corresponding to the 801 section again: if LD1 remains extinguished, it is determined that the 801 section indoor detection circuit has been disconnected; if LD1 is still in a lit state, it means that the normally closed contact of MK1 is not reliably connected or the normally open contact is not completely disconnected, and the reset operation of S4 needs to be re-executed. For example, after this reset, the point inspector finds that LD1 is still slightly lit, immediately checks the gear of MK1, finds that it is not completely locked to the "normally closed gear", re-applies a horizontal left reverse external force to MK1, ensures that the normally open contact is completely disconnected and the normally closed contact is tightly connected, and then LD1 is extinguished, finally confirming that the 801 section indoor detection circuit has been disconnected, and recording "801 section reset normal, indoor detection circuit disconnected" in the "electronic switchboard detection record table".

[0023] A device for detecting a DC track circuit electronic switchboard, comprising a conversion mechanism and a display mechanism, the conversion mechanism and the display mechanism cooperate to form an indoor detection circuit; The conversion mechanism is arranged indoors and is electrically connected with the protection power supply of the DC track circuit and the GK cable core of the electronic switchboard, and is used for switching the outdoor detection mode and the indoor detection mode of the DC track circuit electronic switchboard. The outdoor detection mode relies on the vehicle occupied track section shunt or the artificial shunt track surface, the electronic switchboard in the shunt box to realize detection by positive and negative electricity; The conversion mechanism is a button switch MK, the button switch MK is installed in the indoor distribution cabinet, and one button switch MK is arranged for each DC track circuit electronic switch board; the button switch MK has normally closed contact and normally open contact, under normal circumstances, the normally closed contact remains in the on state, and the normally open contact remains in the off state, at this time, the button switch MK is electrically connected with the outdoor detection circuit of the DC track circuit, and normal operation of the outdoor detection mode is ensured; when indoor detection is needed, the normally closed contact is disconnected and the normally open contact is connected by manually operating the button switch MK, so that the detection mode is switched from the outdoor detection mode to the indoor detection mode, and the indoor detection circuit composed of the conversion mechanism, the display mechanism, the protection power supply and the electronic switch board is connected; When automatic timing cycle detection is needed, the conversion mechanism is set as a programmable contact of a PLC programmable logic controller, the programmable contact is electrically connected with the protection power supply of the DC track circuit, the GK cable core of the electronic switch board and the display mechanism; the programmable contact realizes on-off control through a preset program, and realizes timing cycle scanning switching at a set time interval, and switches between the outdoor detection mode and the indoor detection mode, so that uninterrupted detection of the electronic switch board can be realized without manual operation; when the DC track circuit includes multiple electronic switch boards, the conversion mechanism and the display mechanism corresponding to each electronic switch board are independently arranged, respectively, and each forms an indoor detection circuit of the corresponding electronic switch board, the indoor detection circuits are not interfered with each other, each electronic switch board is independently detected, and the detection results are not affected; The display mechanism is connected in series with the conversion mechanism and is electrically connected with the negative electrode of the protection power supply or the negative electrode of the auxiliary power supply, and is used to present the short circuit state of the electronic switch board, and feedbacks whether the indoor detection circuit is conducted through the state change of the display mechanism itself; The display mechanism includes a light emitting diode (LED) and a current-limiting resistor R5, the LED and the current-limiting resistor R5 are connected in series to form a series assembly, and each DC track circuit electronic switch board is correspondingly provided with one series assembly; one end of the series assembly is electrically connected to the end of the conversion mechanism away from the GK cable core, and the other end is electrically connected to the negative pole GF26V of the auxiliary power supply; the current-limiting resistor R5 is arranged between the LED and the negative pole GF26V of the auxiliary power supply, and has a resistance of 1kΩ and a power of 1 / 4W, for limiting the current size in the indoor detection loop, to avoid damage to the LED caused by excessive current; the LED is a red high-brightness type, and a mark is arranged beside the LED, the mark marks the track section number to which the corresponding electronic switch board belongs, so that the detection results of the electronic switch boards of different track sections can be quickly identified by the staff; the protection power supply of the DC track circuit includes a positive pole GZ20V and a negative pole GF20V, and the current path when the indoor detection loop is turned on is: the positive pole GZ20V of the protection power supply→the Q1 triode of the electronic switch board→the GK cable core→the normally open contact of the conversion mechanism→the current-limiting resistor R5 of the display mechanism→the LED of the display mechanism→the negative pole GF26V of the auxiliary power supply, forming a complete current path. The indoor detection loop is jointly constituted by the conversion mechanism, the display mechanism, the protection power supply and the electronic switch board, and the indoor detection loop and the original working loop of the DC track circuit are independent of each other, and do not affect the original working logic of the DC track circuit in the idle, occupied or fault state of the section. Installation process The distribution cabinet is fixed in the indoor relay room close to the track relay screen (distance ≤ 3m), the cabinet body is grounded (grounding resistance ≤ 4Ω), and electromagnetic interference is prevented. The conversion mechanism is installed in the third layer panel of the distribution cabinet (diameter 12mm), 40 MKs of type KN3-202 are arranged, the MKs are arranged from left to right according to the section numbers 801-840, and the distance between adjacent MKs is 50mm; 20 MKs corresponding to the main line section (801-820) are additionally connected to the relay output end (Q0.0-Q0.19) of the PLC. The display mechanism is installed at a position 50mm to the right of each MK (diameter 5mm), 3MM red LDs and 1kΩ resistors (welded on the negative side of the LD) are installed, the LD pin is welded with a shielding wire, and the shielding layer is grounded. Power supply and loop wiring: The protection power supply GZ20V is led out from the track relay screen, connected to the common end of each MK through a fuse. The output end of the auxiliary power supply GF26V is connected to the negative pole of all the LDs (through a bus bar); The power end of PLC is connected with 220VAC indoor, the communication end is connected with touch screen through RS485 bus, and the input terminal (I0.0-I0.39) is connected with LD state feedback (isolated through photoelectric coupler). Debugging: Manual mode debugging: apply external force to 801 section MK to switch to normally open contact, and observe whether the LD is lit (measure the loop current with a multimeter, which should be stable at 20mA), and the LD is extinguished after resetting; Automatic mode debugging: set the PLC scanning period to 10 minutes on the touch screen, turn on for 5 seconds at a time, start the program, and observe the "scanning state" displayed on the touch screen (such as "scanning 805 section"), simulate Q3 short circuit (short circuit Q3 pin), PLC triggers sound light alarm (touch screen displays "805 section Q3 short circuit"), alarm information remains for 72 hours.

[0024] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A method for detecting an electronic switchboard of a DC track circuit, characterized in that, Includes the following steps: S1. Track section status confirmation steps: Confirm that there are no trains occupying the track section corresponding to the DC track circuit; S2, Detection Mode Switching Steps: Based on the confirmation result of no train occupancy in the track section in S1, operate the conversion mechanism set indoors to disconnect the normally closed contact and connect the normally open contact, switch the detection mode of the DC track circuit electronic switch board from outdoor detection mode to indoor detection mode, and connect the indoor detection circuit. S3, Fault Status Judgment Steps: Based on the indoor detection circuit connected by S2, the status information of the display mechanism is obtained through the display mechanism connected in series with the conversion mechanism in the indoor detection circuit. The short circuit status of the transistor in the DC track circuit electronic switch board is judged based on the status information of the display mechanism. S4. Detection Mode Reset Step: Based on the fault status judgment result of S3, operate the switching mechanism to disconnect the normally open contact and connect the normally closed contact, switch the detection mode of the DC track circuit electronic switch board from indoor detection mode back to outdoor detection mode, and disconnect the indoor detection circuit. S5. Reset Status Confirmation Step: Based on the detection mode reset operation of S4, the status information of the display mechanism is used to confirm that the indoor detection circuit has been disconnected.

2. The method for detecting a DC track circuit electronic switchboard according to claim 1, characterized in that, In S1, the method to confirm that no trains are occupying the track section is: observe the energizing state of the indoor track relay. If the track relay remains energized, it is determined that no trains are occupying the track section.

3. The method for detecting a DC track circuit electronic switchboard according to claim 1, characterized in that, In S2, the switching mechanism is a toggle switch. The specific process of operating the toggle switch is as follows: apply external force to the toggle switch to open the normally closed contact first, and then continue to apply external force to close the normally open contact. In S2, the circuit path of the indoor detection circuit is: positive terminal of the protection power supply of the DC track circuit → transistor in the electronic switch board → cable core wire → normally open contact of the switching mechanism → display mechanism → negative terminal of the protection power supply, forming a complete current path.

4. The method for detecting a DC track circuit electronic switchboard according to claim 1, characterized in that, In step S3, the display mechanism includes a light-emitting diode and a current-limiting resistor connected in series with the light-emitting diode. The current-limiting resistor is set between the light-emitting diode and the negative terminal of the protection power supply. In step S3, the specific method of judging based on the state information of the display mechanism is as follows: if the light-emitting diode is in the lit state, it is determined that the transistor in the DC track circuit electronic switch board is short-circuited; if the light-emitting diode is in the off state, it is determined that the transistor in the DC track circuit electronic switch board is not short-circuited.

5. The method for detecting a DC track circuit electronic switchboard according to claim 1, characterized in that, In S4, the specific process of operating the conversion mechanism is as follows: apply a reverse external force to the conversion mechanism to make the normally open contact of the conversion mechanism open first, and then continue to apply a reverse external force to make the normally closed contact of the conversion mechanism close later. In S4, after the conversion mechanism is reset, the normally closed contact of the conversion mechanism must be kept in the closed state until the next detection operation is started.

6. The method for detecting a DC track circuit electronic switchboard according to claim 1, characterized in that, In step S5, the specific method for confirming that the indoor detection circuit has been disconnected is as follows: if the light-emitting diode in the display mechanism is in an off state, it is determined that the indoor detection circuit has been disconnected; if the light-emitting diode is in an on state, the detection mode reset step of step S4 is executed again.

7. The device for detecting a DC track circuit electronic switchboard according to claim 1, characterized in that, It includes a conversion mechanism and a display mechanism, which cooperate to form an indoor detection circuit; The conversion mechanism is located indoors and is electrically connected to the protection power supply of the DC track circuit and the GK cable core wire of the electronic switch board. It is used to switch the outdoor detection mode and indoor detection mode of the DC track circuit electronic switch board. The outdoor detection mode relies on the vehicle occupying the track section or the manual track surface, and the positive and negative electrical current of the electronic switch board in the junction box to achieve detection. The display mechanism is connected in series with the conversion mechanism and electrically connected to the negative terminal of the protective power supply or the negative terminal of the auxiliary power supply. It is used to present the short circuit state of the electronic switch board and to provide feedback on whether the indoor detection circuit is conducting through its own state changes. The indoor detection circuit consists of a conversion mechanism, a display mechanism, a protective power supply, and an electronic switch board. This indoor detection circuit is independent of the original working circuit of the DC track circuit and does not affect the original working logic of the DC track circuit in the state of idle, occupied, or faulty sections.

8. The device for detecting a DC track circuit electronic switchboard according to claim 7, characterized in that, The switching mechanism is a toggle switch MK, which is installed in the indoor distribution cabinet. Each DC track circuit electronic switch board is equipped with a corresponding toggle switch MK. The toggle switch MK has normally closed contacts and normally open contacts. Under normal conditions, the normally closed contacts are kept in the ON state, and the normally open contacts are kept in the OFF state. At this time, the toggle switch MK is electrically connected to the outdoor detection circuit of the DC track circuit to ensure the normal operation of the outdoor detection mode. When indoor detection is required, the toggle switch MK is manually operated to open the normally closed contacts and close the normally open contacts, thereby switching the detection mode from the outdoor detection mode to the indoor detection mode and connecting the indoor detection circuit composed of the switching mechanism, display mechanism, protective power supply and electronic switch board.

9. The device for detecting a DC track circuit electronic switchboard according to claim 7, characterized in that, The display mechanism includes a light-emitting diode (LED) LD and a current-limiting resistor R5. The LED LD and the current-limiting resistor R5 are connected in series to form a series assembly, and each DC track circuit electronic switch board is equipped with one of these series assemblies. One end of the series assembly is electrically connected to the end of the conversion mechanism away from the GK cable core, and the other end is electrically connected to the negative terminal GF26V of the auxiliary power supply. The current-limiting resistor R5 is placed between the LED LD and the negative terminal GF26V of the auxiliary power supply, with a resistance of 1kΩ and a power of 1 / 4W, and is used to limit the current in the indoor detection circuit to avoid excessive current damage. The faulty LED (LD) is a red high-brightness LED with a label next to it, indicating the track section number to which the electronic switch board belongs. The protection power supply of the DC track circuit includes a positive terminal GZ20V and a negative terminal GF20V. The current path when the indoor detection circuit is conducting is as follows: protection power supply positive terminal GZ20V → Q1 transistor of the electronic switch board → GK cable core → normally open contact of the conversion mechanism → current limiting resistor R5 of the display mechanism → LED (LD) of the display mechanism → auxiliary power supply negative terminal GF26V, forming a complete current path.

10. The device for detecting a DC track circuit electronic switchboard according to claim 8, characterized in that, When automatic timed cyclic detection is required, the switching mechanism is set as a programmable contact of a PLC programmable logic controller. The programmable contact is electrically connected to the protection power supply of the DC track circuit, the GK cable core of the electronic switch board, and the display mechanism. The programmable contact realizes on-off control through a preset program, and performs timed cyclic scanning switching according to a set time interval, switching between outdoor detection mode and indoor detection mode. Uninterrupted detection of the electronic switch board can be achieved without manual operation. When the DC track circuit contains multiple electronic switch boards, the switching mechanism and display mechanism corresponding to each electronic switch board are independently configured, each forming an indoor detection circuit for the corresponding electronic switch board. The indoor detection circuits do not interfere with each other, and each electronic switch board is detected independently without affecting the detection results.

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