Turnout position detection device and system

Abstract

The embodiments of the present invention provide a turnout position detection device and system, which relate to the railway field. The turnout position detection device includes a DC power supply group, a drive circuit connected to the DC power supply group, and a position detection circuit connected to the drive circuit. Therefore, compared with the prior art method of detecting turnout position using a polarity-biased relay that relies on an AC power supply, the technical solution provided by the embodiments of the present invention uses a DC power supply group to provide a more reliable signal and higher security. This can improve the problems of low safety factors and low reliability in the prior art, thereby improving reliability and safety. In addition, the turnout position detection device uses an electronic circuit to implement the functions performed by the polarity-biased relay in a switch machine, and has the following advantages: the electronic components take up less space; they can be plugged and unplugged under power, making replacement easy.

Description

Technical Field

[0001] The present invention relates to the field of turnout detection, and in particular to a turnout position detection device and system. Background Art

[0002] A switch is an important signaling device used to reliably change the position of a turnout, change the direction of turnout opening, lock the switch point, and indicate the turnout position. It effectively ensures driving safety, improves transportation efficiency, and reduces the workload of drivers. Because switch machines and turnouts are crucial components of railway transportation, their position detection is essential for track safety.

[0003] Currently, existing turnout position detection devices primarily utilize polarized relays, which are used in railway switch control position detection applications. These relays utilize an AC power source and operate by rectifying the AC power source into a half-wave DC power source via a rectifier diode. If the power source direction aligns with the magnetic properties of the permanent magnet in the polarized relay, the relay engages; otherwise, it does not. However, these existing detection devices have the following major drawbacks: Because they rely on polarized relays powered by AC power, malfunctions can cause safety hazards if the relay fails to engage properly or has a delayed response.

[0004] In summary, the existing turnout position detection device has the problems of low safety factor and low reliability. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a switch position detection device and system.

[0006] In order to achieve the above objectives, the technical solutions adopted in the embodiments of the present invention are as follows:

[0007] In a first aspect, an embodiment of the present invention provides a turnout position detection device, comprising: a DC power supply group, a drive circuit connected to the DC power supply group, and a position detection circuit connected to the drive circuit.

[0008] In an optional embodiment, the DC power supply group includes a first power supply and a DC power supply.

[0009] In an optional embodiment, the drive circuit includes a positioning drive circuit and an inversion drive circuit; wherein the positioning drive circuit includes transistors Q17, Q18, field effect transistors Q7, Q10, an optoelectronic isolator U13, and resistors R22, R23, and R31; the base of Q17 serves as a signal input terminal and is connected to a trigger signal BS_CF; the collector of Q17 is connected to the positive terminal of the first power supply, the emitter of Q17 is connected to one end of R31, and the other end of R31 is connected to the first input terminal of U13 The second input terminal of U13 is grounded, the first output terminal of U13 is connected to the gate of Q7; the second output terminal of U13 is connected to the base of Q18; the collector of Q18 is connected to one end of R22; the other end of R22 is connected to the drain of Q7 and the positive end of the DC power supply; the emitter of Q18 is connected to one end of R23 and the gate of Q10, and the other end of R23 is connected to the source of Q10 and the negative end of the DC power supply; the drain of Q10 serves as the first signal output terminal; the source of Q7 serves as the second signal output terminal;

[0010] The inversion drive circuit includes transistors Q25 and Q19, field-effect transistors Q8 and Q9, an optoelectronic isolator U14, and resistors R24, R25, R53, and R54; one end of R54 serves as a signal input end and is connected to the trigger signal BS_CF; the other end of R54 is connected to the base of Q25; the collector of Q25 is connected to one end of R53 and the first input terminal of U14, the other end of R53 is connected to the positive terminal of the first power supply, the emitter of Q25 is connected to the second input terminal of U14 and grounded, the first output terminal of U14 is connected to the gate of Q8; the second output terminal of U14 is connected to the base of Q19; the collector of Q19 is connected to one end of R24; the other end of R24 is connected to the drain of Q8 and the positive terminal of the DC power supply; the emitter of Q19 is connected to one end of R25 and the gate of Q9, and the other end of R25 is connected to the source of Q9 and the negative terminal of the DC power supply; the source of Q8 serves as the first signal output end; the drain of Q9 serves as the second signal output end.

[0011] In an optional implementation, Q7 and Q8 are PMOS transistors; Q9 and Q10 are NMOS transistors.

[0012] In an optional implementation, the voltage of the DC power supply is 24V, and the voltage of the first power supply is 5V.

[0013] In an optional embodiment, the position detection circuit includes resistors R50, R42, R43, optoelectronic isolators U15, U16, and diodes D12 and D13; one end of R50 is connected to the second signal output end, and the other end of R50 serves as the output end X3_1 of the position detection circuit; the first input end of U15 is connected to the negative pole of D12 and one end of R42; the second input end of U15 and the positive pole of D12 are connected to the first signal output end, and the first output end of U15 serves as the DW signal end; the second output end of U15 is grounded; the other end of R42 serves as the DW_1 signal end; the first input end of U16 is connected to the negative pole of D13 and the positive pole of D12; the second input end of U16 and the positive pole of D13 are connected to one end of R43, and the first output end of U16 serves as the FW signal end; the second output end of U16 is grounded; the other end of R43 serves as the FW_1 signal end.

[0014] In an optional embodiment, the position detection circuit also includes an electronic relay circuit, which includes: electronic relays RL1 and RL2, diodes D28 and D29, transistors Q14, Q15, and Q16, and resistors R28 and R29; the coil of the electronic relay RL1 is connected in parallel to the two ends of the diode D29, and the positive electrode of D29 is connected to the first power supply; the negative electrode of D29 is connected to the collector of Q15; the coil of the electronic relay RL2 is connected in parallel to the two ends of the diode D28, and the positive electrode of D28 is connected to the first power supply; the negative electrode of D28 is connected to the collector of Q16; one end of the resistor R28 is connected to the first power supply; the other end of R28 is connected to the base of Q15 and Q16; the emitter of Q16 is grounded GND; the emitter of Q15 is grounded GND; one end of Q14 is connected to the other end of R28, the base of Q14 is connected to one end of R29, and the other end of R29 is connected to the BS_DK signal; the emitter of R29 is grounded GND.

[0015] In an optional embodiment, the device further includes a trigger control circuit, which includes a microprocessor U21.

[0016] In an optional embodiment, the microprocessor U21 uses an AT89C51 chip.

[0017] In a second aspect, an embodiment of the present invention provides a switch position detection system, comprising a switch machine and a switch position detection device as described in any one of the aforementioned embodiments.

[0018] The embodiments of the present invention bring the following beneficial effects:

[0019] The present invention provides a turnout position detection device and system, wherein the turnout position detection device includes: a DC power supply group, a drive circuit connected to the DC power supply group, and a position detection circuit connected to the drive circuit. Therefore, compared to the prior art method of detecting turnout position using a polarity-biased relay that relies on an AC power supply, the technical solution provided by the embodiments of the present invention, through the DC power supply group, provides a more reliable signal and higher security, thereby improving the problem of low safety factors in the prior art and enhancing safety. In addition, the turnout position detection device uses an electronic circuit to implement the functions performed by the polarity-biased relay in the switch machine, and has the following advantages: the electronic components take up less space; they can be plugged and unplugged under power, making replacement easy.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of a switch position detection device provided by an embodiment of the present invention is shown;

[0023] Figure 2 Shown Figure 1 Circuit diagram of the driving circuit and position detection circuit;

[0024] Figure 3 A schematic diagram of an electronic relay circuit provided by an embodiment of the present invention is shown;

[0025] Figure 4 A schematic diagram of a trigger control circuit provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0028] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0029] Currently, existing turnout position detection devices primarily utilize polarized relays, used in railway switch control position detection applications. These polarized relays utilize an AC power source and operate by rectifying the AC power source into a half-wave DC power source via a rectifier diode. If the power source direction aligns with the magnetic properties of the permanent magnet in the polarized relay, the relay engages; otherwise, it does not. These existing turnout detection devices have the following major drawbacks: Because they rely on polarized relays powered by AC power, malfunctions can cause safety hazards if the relay fails to engage properly or has a delayed response.

[0030] Based on this, an embodiment of the present invention provides a turnout position detection device and system, which can alleviate the problem of poor reliability in the prior art and improve the reliability and safety of the turnout position.

[0031] To facilitate understanding, a switch position monitoring device provided by an embodiment of the present invention is first described below.

[0032] Example 1

[0033] like Figure 1 As shown, an embodiment of the present invention provides a turnout position detection device, comprising: a DC power supply group 100, a drive circuit 200 connected to the DC power supply group, and a position detection circuit 300 connected to the drive circuit.

[0034] In some embodiments, the DC power supply group includes a first power supply and a DC power supply.

[0035] In some embodiments, the voltage of the DC power supply is 24V, and the voltage of the first power supply is 5V.

[0036] In some embodiments, as Figure 2 As shown, the driving circuit includes a positioning driving circuit and an inversion driving circuit; wherein the positioning driving circuit includes transistors Q17 and Q18, field effect transistors Q7 and Q10, an optoelectronic isolator U13, and resistors R22, R23, and R31; the base of Q17 serves as a signal input terminal and is connected to a trigger signal BS_CF; the collector of Q17 is connected to the positive terminal of the first power supply, the emitter of Q17 is connected to one end of R31, the other end of R31 is connected to the first input terminal of U13, the second input terminal of U13 is grounded, the first output terminal of U13 is connected to the gate of Q7; the second output terminal of U13 is connected to the base of Q18; the collector of Q18 ... Connect one end of R22; the other end of R22 is connected to the drain of Q7 and the positive end of the DC power supply; the emitter of Q18 is connected to one end of R23 and the gate of Q10, and the other end of R23 is connected to the source of Q10 and the negative end of the DC power supply; the drain of Q10 serves as the first signal output end; the source of Q7 serves as the second signal output end; R22 and R23 are used as voltage dividing resistors for voltage division; VCC in the figure represents the first power supply, specifically, the first power supply is 5V, which can provide power support for the isolator; +24V in the figure represents the positive end of the DC power supply; the negative end of the first power supply is grounded GND; the negative end of the DC power supply is grounded 24GND.

[0037] The inversion drive circuit includes transistors Q25 and Q19, field-effect transistors Q8 and Q9, an optoelectronic isolator U14, and resistors R24, R25, R53, and R54; one end of R54 serves as a signal input end and is connected to the trigger signal BS_CF; the other end of R54 is connected to the base of Q25; the collector of Q25 is connected to one end of R53 and the first input terminal of U14, the other end of R53 is connected to the positive terminal of the first power supply, the emitter of Q25 is connected to the second input terminal of U14 and grounded, the first output terminal of U14 is connected to the gate of Q8; the second output terminal of U14 is connected to the base of Q19; the collector of Q19 is connected to one end of R24; the other end of R24 is connected to the drain of Q8 and the positive terminal of the DC power supply; the emitter of Q19 is connected to one end of R25 and the gate of Q9, and the other end of R25 is connected to the source of Q9 and the negative terminal of the DC power supply; the source of Q8 serves as the first signal output end; the drain of Q9 serves as the second signal output end.

[0038] In some implementations, Q7 and Q8 are PMOS transistors; Q9 and Q10 are NMOS transistors.

[0039] In some embodiments, reference Figure 2The position detection circuit includes resistors R50, R42, R43, optoelectronic isolators U15, U16, and diodes D12 and D13; one end of R50 is connected to the second signal output end, and the other end of R50 serves as the output end X3_1 of the position detection circuit; the first input end of U15 is connected to the negative pole of D12 and one end of R42; the second input end of U15 and the positive pole of D12 are connected to the first signal output end, and the first output end of U15 serves as the DW signal end of the position detection circuit; the second output end of U15 is grounded; the other end of R42 serves as the DW_1 signal end of the position detection circuit; the first input end of U16 is connected to the negative pole of D13 and the positive pole of D12; the second input end of U16 and the positive pole of D13 are connected to one end of R43, and the first output end of U16 serves as the FW signal end of the position detection circuit; the second output end of U16 is grounded; the other end of R43 serves as the FW_1 signal end of the position detection circuit.

[0040] In some embodiments, the position detection circuit further includes an electronic relay circuit, referring to Figure 3 The electronic relay circuit includes: electronic relays RL1 and RL2, diodes D28 and D29, transistors Q14, Q15, and Q16, and resistors R28 and R29; the coil of the electronic relay RL1 is connected in parallel to the two ends of the diode D29, the positive electrode of D29 is connected to the first power supply; the negative electrode of D29 is connected to the collector of Q15; the coil of the electronic relay RL2 is connected in parallel to the two ends of the diode D28, the positive electrode of D28 is connected to the first power supply; the negative electrode of D28 is connected to the collector of Q16; one end of the resistor R28 is connected to the first power supply; the other end of R28 is connected to the bases of Q15 and Q16; the emitter of Q16 is grounded GND; the emitter of Q15 is grounded GND; one end of Q14 is connected to the other end of R28, the base of Q14 is connected to one end of R29, and the other end of R29 is connected to the BS_DK signal; the emitter of R29 is grounded GND.

[0041] In some embodiments, the device further includes a trigger control circuit, which includes a microprocessor U21.

[0042] It should be noted that Figure 4 A schematic diagram of a trigger control circuit is shown; of course, the trigger control circuit can also refer to other circuit forms controlled by a microprocessor in the prior art, which will not be described in detail here.

[0043] In some implementations, the microprocessor U21 uses an AT89C51 chip.

[0044] The switch position detection device includes: a DC power supply group, a drive circuit connected to the DC power supply group, and a position detection circuit connected to the drive circuit. Therefore, compared to the prior art method of relying on an AC power supply and a polarity relay for position detection, the technical solution provided by the embodiment of the present invention, through the DC power supply group, provides a more reliable signal and higher security, which can improve the problem of low safety factor in the prior art and improve safety. In addition, the present application uses a DC power supply to replace the AC power supply and a photoelectric isolator to replace the polarity relay, realizing full electronic circuit detection and completing the function of the polarity relay in switch position detection. The device also has the following advantages: the electronic components take up less space; it can be plugged and unplugged under power, making it easy to replace.

[0045] Example 2

[0046] This embodiment provides a turnout position detection device, which includes a trigger control circuit, a drive circuit, a position detection circuit, and an electronic relay circuit;

[0047] The following combination Figures 2 to 4 Each circuit of the device is described in detail:

[0048] 1. Trigger control circuit:

[0049] The trigger signal adopts a periodically changing square wave signal, and adopts an inversion circuit to obtain two opposite signals to trigger the driving circuit to work.

[0050] The trigger signal is sent from the microprocessor (CPU) U21: AT89C51 chip P1.2 pin, trigger signal BS_CF, to the drive circuit.

[0051] It should be pointed out that the CPU can complete the logic programming processing of the trigger signal and signal locking;

[0052] Specifically, it has the following three functions: (1) the periodic changing signal can be completed by the internal timer; (2) the "positioning operation" and "inversion operation" signals sent from the CPU determine the flag bit, when the flag bit is "0", it indicates positioning, and when it is "1", it indicates inversion; (3) the trigger signal is determined to be "1" or "0" according to the flag bit, and it is judged whether the input signal is consistent with the corresponding "positioning" and "inversion". If not, the trigger signal is reversed periodically; once the "positioning" or "inversion" signal is detected, the trigger signal reversal is stopped and the last output state - that is, locked - is maintained.

[0053] 2. Driving circuit:

[0054] The driving circuit includes a positioning driving circuit composed of Q17, Q18, U13, Q7, Q10 and resistors R22, R23, and R31; and an inversion driving circuit composed of Q25, Q19, U14, Q8, Q9 and resistors R24, R25, R53, and R54; among which Q7 and Q8 use PMOS tubes, and Q9 and Q10 use NMOS tubes.

[0055] Its working principle is as follows: When the trigger signal BS_CF is high:

[0056] (1) Positioning drive circuit: Q17 is turned on, the optoelectronic isolator U13 is turned on, Q18 is turned on, and the voltage is divided by R22\R23 to meet the Q7 and Q10 switch conduction conditions. Q7 and Q10 are turned on at the same time;

[0057] (2) Inverting drive circuit: Q25 is turned on, the optoelectronic isolator U14 is turned off, Q19 works in the cut-off state, and the voltage is divided by R24\R25, and the switch-on conditions of Q8 and Q9 are not met, so Q8 and Q9 are turned off at the same time;

[0058] At this time, the line connected between Q7 and Q9 outputs 24V+, and the line connected between Q8 and Q10 outputs 24V ground.

[0059] When the trigger signal BS_CF is low:

[0060] (1) Positioning drive circuit: Q17 is turned on, the optoelectronic isolator U13 is turned off, Q18 is working in the cut-off state, and the voltage is divided by R22\R23, and the switch-on conditions of Q7 and Q10 are not met, so Q7 and Q10 are turned off at the same time;

[0061] (1) Inverting drive circuit: Q18 is turned on, the optoelectronic isolator U14 is turned on, Q19 is turned on, and the voltage is divided by R24\R25 to meet the Q8 and Q9 switch conduction conditions, and Q8 and Q9 are turned on at the same time;

[0062] At this time, the line connected between Q7 and Q9 outputs 24V ground, and the line connected between Q8 and Q10 outputs 24V+.

[0063] The drive circuit uses a bridge circuit. PMOS transistors (Q7 and Q8) connect to 24V+, and NMOS transistors (Q9 and Q10) connect to 24V-. At any given moment, only the two intersecting MOS transistors on the bridge arm are turned on. In other words, Q8 and Q9 are turned on simultaneously, or Q7 and Q10 are turned on simultaneously. This outputs a varying 24V square wave signal to the switch.

[0064] 3. Position detection circuit:

[0065] The position detection circuit uses a photoelectric isolator to detect the direction of current in the circuit.

[0066] The circuit includes a 24V power supply, resistors R50, R42, R43, U15, U16, an electronic relay, and may also include an automatic switch switch (not shown in the figure).

[0067] 4. Electronic relay circuit

[0068] When the switch machine is turning, the CPU chip's pin P1.7 sends a BS_DK signal, driving relays RL1 and RL2 to operate, disconnecting the detection circuit from the switch machine. When the switch machine stops turning, the detection circuit is connected to the switch machine circuit.

[0069] If the "automatic switch" in the switch machine is connected to the "positioning" contact, U15 will be turned on; if the "automatic switch" in the switch machine is connected to the "reverse" contact, U16 will be turned on; the signal is transmitted to the "trigger and locking circuit" to stop the trigger signal from converting.

[0070] In this application, because the switch circuit adopts circuit multiplexing, that is, the power drive and detection circuits use the same line, during the switch switching, the detection circuit is disconnected through RL1 and RL2. After the switch is in place, the power stops working and the detection circuit is connected.

[0071] Since there is no polarity-biased relay in electronic relays, this application uses an electronic circuit to realize the function of the polarity-biased relay in the switch machine. Compared with the mechanical polarity-biased relay, it has the following advantages:

[0072] (1) DC power supply is used, and the signal is reliable;

[0073] (2) Electronic devices take up less space;

[0074] (3) It can be plugged in and out while powered on, making replacement easy.

[0075] Example 3

[0076] An embodiment of the present invention provides a switch position detection system, comprising a switch machine and a switch position detection device as described in any one of the aforementioned embodiments.

[0077] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A turnout position detection device, characterized in that: include: A DC power supply group, a drive circuit connected to the DC power supply group, and a position detection circuit connected to the drive circuit; The DC power supply group includes a first power supply and a DC power supply; The driving circuit includes a positioning driving circuit and an inversion driving circuit; wherein the positioning driving circuit includes transistors Q17 and Q18, field effect transistors Q7 and Q10, an optoelectronic isolator U13, and resistors R22, R23, and R31; the base of Q17 serves as a signal input terminal and is connected to a trigger signal BS_CF; the collector of Q17 is connected to the positive terminal of a first power supply, the emitter of Q17 is connected to one end of R31, the other end of R31 is connected to a first input terminal of U13, the second input terminal of U13 is grounded, and the first output terminal of U13 is connected to the gate of Q7; the second output terminal of U13 is connected to the base of Q18; the collector of Q18 is connected to one end of R22; the other end of R22 is connected to the drain of Q7 and the positive terminal of a DC power supply; the emitter of Q18 is connected to one end of R23 and the gate of Q10, and the other end of R23 is connected to the source of Q10 and the negative terminal of the DC power supply; the drain of Q10 serves as a first signal output terminal; the source of Q7 serves as a second signal output terminal; The inversion drive circuit includes transistors Q25 and Q19, field effect transistors Q8 and Q9, an optoelectronic isolator U14, and resistors R24, R25, R53, and R54; one end of R54 serves as a signal input terminal and is connected to a trigger signal BS_CF; the other end of R54 is connected to the base of Q25; the collector of Q25 is connected to one end of R53 and a first input terminal of U14, the other end of R53 is connected to the positive terminal of a first power supply, the emitter of Q25 is connected to a second input terminal of U14 and is grounded, the first output terminal of U14 is connected to the gate of Q8; the second output terminal of U14 is connected to the base of Q19; the collector of Q19 is connected to one end of R24; the other end of R24 is connected to the drain of Q8 and the positive terminal of a DC power supply; the emitter of Q19 is connected to one end of R25 and a gate of Q9, the other end of R25 is connected to the source of Q9 and the negative terminal of a DC power supply; the source of Q8 serves as a first signal output terminal; the drain of Q9 serves as a second signal output terminal; When the trigger signal BS_CF is high: In the positioning drive circuit, Q17 is turned on, the optoelectronic isolator U13 is turned on, and Q18 is turned on. Through the voltage division of R22\R23, the switch conduction conditions of Q7 and Q10 are met, and Q7 and Q10 are turned on at the same time; In the reverse driving circuit, Q25 is turned on, the optoelectronic isolator U14 is turned off, and Q19 is working in the cut-off state. Through the voltage divider of R24\R25, the switch turn-on conditions of Q8 and Q9 are not met, and Q8 and Q9 are turned off at the same time.

2. The switch position detection device according to claim 1, characterized in that: Q7 and Q8 are PMOS transistors; Q9 and Q10 are NMOS transistors.

3. The switch position detection device according to claim 1, characterized in that: The voltage of the DC power supply is 24V, and the voltage of the first power supply is 5V.

4. The switch position detection device according to claim 1, characterized in that: The position detection circuit includes resistors R50, R42, R43, optoelectronic isolators U15, U16, and diodes D12 and D13; one end of R50 is connected to the second signal output end, and the other end of R50 serves as the output end X3_1 of the position detection circuit; the first input end of U15 is connected to the negative pole of D12 and one end of R42; the second input end of U15 and the positive pole of D12 are connected to the first signal output end, and the first output end of U15 serves as the DW signal end; the second output end of U15 is grounded; the other end of R42 serves as the DW_1 signal end; the first input end of U16 is connected to the negative pole of D13 and the positive pole of D12; the second input end of U16 and the positive pole of D13 are connected to one end of R43, and the first output end of U16 serves as the FW signal end; the second output end of U16 is grounded; the other end of R43 serves as the FW_1 signal end.

5. The switch position detection device according to claim 1, characterized in that: The position detection circuit also includes an electronic relay circuit, which includes: electronic relays RL1 and RL2, diodes D28 and D29, transistors Q14, Q15, and Q16, and resistors R28 and R29; the coil of the electronic relay RL1 is connected in parallel to the two ends of the diode D29, the positive electrode of D29 is connected to the first power supply; the negative electrode of D29 is connected to the collector of Q15; the coil of the electronic relay RL2 is connected in parallel to the two ends of the diode D28, the positive electrode of D28 is connected to the first power supply; the negative electrode of D28 is connected to the collector of Q16; one end of the resistor R28 is connected to the first power supply; the other end of R28 is connected to the bases of Q15 and Q16; the emitter of Q16 is grounded GND; the emitter of Q15 is grounded GND; one end of Q14 is connected to the other end of R28, the base of Q14 is connected to one end of R29, and the other end of R29 is connected to the BS_DK signal; the emitter of R29 is grounded GND.

6. The switch position detection device according to claim 1, characterized in that: It also includes a trigger control circuit, which includes a microprocessor U21.

7. The switch position detection device according to claim 6, characterized in that: The microprocessor U21 adopts AT89C51 chip.

8. A turnout position detection system, characterized in that: The invention comprises a switch machine and a switch position detection device according to any one of claims 1 to 7.

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