Locomotive fireless loopback control circuit and vehicle

Abstract

The invention discloses a locomotive fireless return control circuit and a vehicle, and is applied to the field of rail transit. According to the principle of the locomotive fireless loopback control circuit, when the first end of a fireless selection switch and the second end of the fireless selection switch are connected, a brake release circuit and an emergency control circuit are connected into the locomotive fireless loopback control circuit through a second contact of a parking brake release key and a storage battery output contactor; when the third end of the fireless selection switch and the fourth end of the fireless selection switch are conducted, the brake release circuit is connected to the locomotive fireless return control circuit through a first contact of the parking brake release key; and the connection between the emergency control circuit and the locomotive fireless loopback control circuit is cut off through the emergency bypass relay and the storage battery output contactor. Therefore, the fireless return process of the driver and the conductor is simplified, the driver and the conductor do not need to get off a vehicle body to handle a hand-pulled relief ring, operation is easy and safe, working efficiency is improved, and safety of the vehicle during running is improved.

Description

Technical Field

[0001] The present application relates to the field of rail transportation, and in particular to a locomotive fire-free return control circuit and a transportation vehicle. Background Art

[0002] At present, the parking brake of electric locomotives is realized by the driver pressing the parking release and parking application buttons on the operating console to control the power gain and loss of the parking release solenoid valve and the parking application solenoid valve, thereby controlling the release and application of the brake caliper. In addition, a parking indicator is set outside the vehicle to identify the release and application status of the parking brake, and the locomotive control system determines the parking brake status by collecting the status of the parking brake pressure switch and the isolation plug, and prompts the driver on the microcomputer display. When the electric locomotive is used as a trailer for fire-free return, the locomotive itself is in a power-free state. At this time, the parking brake and emergency brake are automatically applied due to power failure. The driver and crew need to manually turn the parking brake isolation plug from the input position to the isolation position on the vehicle, and then get off the vehicle to pull the hand-pull release ring on the parking brake unit brake to vent the air pressure in the parking pipe to release the parking brake.

[0003] Among them, when the electric locomotive is used as a trailer for fire-free return, since the body is in a powerless state, the driver and passengers cannot observe the application and release status of the parking brake. If the parking brake is not released, the locomotive will run with the brake, causing wheel rubbing accidents or wheel set overheating failures, which will bring great risks to driving safety. And because the hand-pull release ring is located under the car, when the locomotive is running in the third rail power supply section, the driver and passengers need to manually release the parking brake under the car, and this process poses a safety risk of electric shock.

[0004] In view of the above technology, seeking a locomotive fire-free return control circuit is an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0005] The purpose of this application is to provide a locomotive fire-free return control circuit and a vehicle, which can solve the problem in the prior art that the driver and passengers cannot observe the parking brake application and release state, and the driver and passengers need to manually release the parking brake under the vehicle, which brings great risks to the safety of driving and the driver and passengers.

[0006] In order to solve the above technical problems, the present application provides a locomotive fire-free return control circuit, including: an emergency control circuit and a brake release circuit, and also including: a fire-free selection switch, an emergency bypass relay and a parking brake release button;

[0007] Wherein, the first end of the no-fire selection switch is connected to the power supply; the second end of the no-fire selection switch is connected to the first end of the emergency bypass relay and the first end of the first contact of the parking brake release button; the third end of the no-fire selection switch is connected to the emergency control loop circuit; the fourth end of the no-fire selection switch is connected to the battery output contactor;

[0008] The first end of the second contact of the parking brake release button is connected to the emergency control circuit; the second end of the second contact of the parking brake release button is connected to the second end of the first contact of the parking brake release button and the brake release circuit; so that when the first end of the no-fire selection switch and the second end of the no-fire selection switch are turned on, the brake release circuit and the emergency control circuit are respectively connected to the locomotive no-fire return control circuit through the second contact of the parking brake release button and the battery output contactor; when the third end of the no-fire selection switch and the fourth end of the no-fire selection switch are turned on, the brake release circuit is connected to the locomotive no-fire return control circuit through the first contact of the parking brake release button, and the connection between the emergency control circuit and the locomotive no-fire return control circuit is disconnected through the emergency bypass relay and the battery output contactor.

[0009] Preferably, the emergency control loop comprises: a first emergency loop and a second emergency loop;

[0010] Wherein, the first end of the first emergency loop is connected to the third end of the no-fire selection switch, the positive pole of the power supply and the first end of the second contact of the parking brake release button, and the second end of the first emergency loop is connected to the first end of the second emergency loop;

[0011] The second end of the second emergency loop is connected to the negative pole of the power supply.

[0012] Preferably, the emergency control circuit further comprises: a first emergency relay and a second emergency relay;

[0013] wherein the first end of the first emergency relay is connected to the second end of the first emergency loop and the first end of the second emergency relay;

[0014] A second end of the first emergency relay is connected to a second end of the second emergency relay and a first end of the second emergency loop.

[0015] Preferably, the brake relief circuit comprises: a parking brake relief solenoid valve, a parking brake relief state relay and a parking brake pressure switch;

[0016] Wherein, the first end of the parking brake release solenoid valve is connected to the second end of the first contact of the parking brake release button and the first end of the second contact of the parking brake release button, and the second end of the parking brake release solenoid valve is connected to the first end of the parking brake release state relay and the second end of the emergency bypass relay;

[0017] A second terminal of the parking brake release state relay is connected to a first terminal of the parking brake pressure switch;

[0018] The second end of the parking brake pressure switch is connected to the first end of the first contact of the parking brake release button and the second end of the second contact of the parking brake release button.

[0019] Preferably, it also includes: a first indicator light and a second indicator light;

[0020] Wherein, the first end of the first indicator light is connected to the first end of the second indicator light, the first end of the emergency bypass relay and the first end of the first contact of the parking brake release button;

[0021] The second end of the first indicator light and the second end of the second indicator light are connected to the second end of the emergency bypass relay.

[0022] Preferably, it also includes: a third indicator light;

[0023] The first end of the third indicator light is connected to the first end of the no-fire selection switch and the power supply, and the second end of the third indicator light is connected to the second end of the emergency bypass relay.

[0024] Preferably, it further comprises: a first diode and a second diode;

[0025] Wherein, the anode of the first diode is connected to the first end of the emergency bypass relay, and the cathode of the first diode is connected to the first end of the first contact of the parking brake release button;

[0026] The anode of the second diode is connected to the first end of the second contact of the parking brake release button, and the cathode of the second diode is connected to the brake release circuit and the second end of the first contact of the parking brake release button.

[0027] Preferably, it further comprises: a third diode;

[0028] Wherein, the anode of the third diode is connected to the second end of the second contact of the parking brake release button;

[0029] The cathode of the third diode is connected to the first end of the first contact of the parking brake release button.

[0030] Preferably, it also includes: a key switch;

[0031] Wherein, the first end of the key switch is connected to the fourth end of the no-fire selection switch;

[0032] The second end of the key switch is connected to the battery output contactor.

[0033] On the other hand, the present application also provides a means of transportation, comprising the above-mentioned locomotive fire-free return control circuit.

[0034] The present application provides a locomotive no-fire return control circuit, comprising: an emergency control circuit, a brake release circuit, a no-fire selection switch, an emergency bypass relay and a parking brake release button; wherein the first end of the no-fire selection switch is connected to a power supply; the second end of the no-fire selection switch is connected to the first end of the emergency bypass relay and the first end of the first contact of the parking brake release button; the third end of the no-fire selection switch is connected to the emergency control loop circuit; the fourth end of the no-fire selection switch is connected to the battery output contactor; the first end of the second contact of the parking brake release button is connected to the emergency control circuit; the second end of the second contact of the parking brake release button is connected to the parking brake release button. The second end of the first contact of the parking brake release button is connected to the brake release circuit; so that when the first end of the no-fire selection switch and the second end of the no-fire selection switch are turned on, the brake release circuit and the emergency control circuit are connected to the no-fire return control circuit of the locomotive through the second contact of the parking brake release button and the battery output contactor respectively; when the third end of the no-fire selection switch and the fourth end of the no-fire selection switch are turned on, the brake release circuit is connected to the locomotive no-fire return control circuit through the first contact of the parking brake release button, and the connection between the emergency control circuit and the locomotive no-fire return control circuit is disconnected through the emergency bypass relay and the battery output contactor. It can be seen that the present application does not need to optimize the complex on-board air brake pipeline, and can realize the function selection, interlocking and independent control between no-fire return and normal locomotive operation, and simplifies the no-fire return process of drivers and passengers, and does not need to get off the car body to handle the hand-pull release ring, which is simple and safe to operate, and improves work efficiency; at the same time, the parking release circuit is used to monitor the parking brake during no-fire return in real time and directly feedback to the driver and passengers, thereby improving the safety of the vehicle during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] FIG1 is a structural diagram of a locomotive fire-free return control circuit provided in an embodiment of the present application;

[0037] FIG2 is a control schematic diagram of a locomotive fire return control circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] The core of this application is to provide a locomotive fire-free return control circuit and a transportation tool.

[0040] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0041] In order to solve the above technical problems, the present application provides a locomotive fire-free return control circuit, as shown in FIG1, comprising an emergency control circuit 1, a brake release circuit 2, a fire-free selection switch S03, an emergency bypass relay K04 and a parking brake release button S1. In addition, the circuit shown in FIG1 also includes: a power supply 3 and a battery output contactor Q01. The connection relationship of the circuit is as follows: wherein, the first end of the fire-free selection switch S03 is connected to the power supply 3; the second end of the fire-free selection switch S03 is connected to the first end of the emergency bypass relay K04 and the first end of the first contact S11 of the parking brake release button S1; the third end of the fire-free selection switch S03 is connected to the emergency control loop circuit 1; the fourth end of the fire-free selection switch S03 is connected to the battery output contactor Q01; the first end of the second contact S12 of the parking brake release button S1 is connected to the emergency control circuit 1; the second end of the second contact S12 of the parking brake release button S1 is connected to the second end of the first contact S11 of the parking brake release button S1 and the brake release circuit 2.

[0042] In a specific embodiment, the principle of the locomotive fire-free return control circuit provided by the present application is: when the locomotive is in normal operating mode, that is, the first end of the fire-free selection switch S03 and the second end of the fire-free selection switch S03 are turned on, at this time, the battery output contactor Q01 is powered on and closed, and the emergency bypass relay K04 is powered off and disconnected. The brake release circuit 2 is connected to the locomotive fire-free return control circuit through the second contact S12 of the parking brake release button S1 as a whole, so as to ensure that the driver and passengers inside the locomotive can realize the parking brake release function of the locomotive through the parking brake release button S1; the emergency control circuit 1 is connected to the locomotive fire-free return control circuit through the battery output contactor Q01 as a whole, so as to ensure that when the locomotive is in normal operating mode and when a fault occurs, the emergency control circuit 1 can work normally in time to avoid safety risks.

[0043] When the locomotive is in the fire-free return mode, that is, the third terminal of the fire-free selection switch S03 and the fourth terminal of the fire-free selection switch S03 are connected, the normal operation mode and the fire-free return mode of the locomotive are interlocked, and the battery output contactor Q01 is disconnected and the emergency bypass relay K04 is powered on and closed. The brake release circuit 2 is connected to the fire-free return control circuit of the locomotive through the first contact S11 of the parking brake release button S1 as a whole, so as to ensure that the driver and passengers inside the locomotive can realize the parking brake release function of the locomotive through the parking brake release button S1; the connection between the emergency control circuit 1 and the fire-free return control circuit of the locomotive is disconnected as a whole through the battery output contactor Q01 and the emergency bypass relay K04, so as to avoid the problem that when the locomotive is in the fire-free return stage, the wheel rubbing accident or wheel set overheating failure caused by the normal operation of the emergency control circuit 1 brings great risks to driving safety.

[0044] The present application provides a locomotive no-fire return control circuit, comprising: an emergency control circuit, a brake release circuit, a no-fire selection switch, an emergency bypass relay and a parking brake release button; wherein the first end of the no-fire selection switch is connected to a power supply; the second end of the no-fire selection switch is connected to the first end of the emergency bypass relay and the first end of the first contact of the parking brake release button; the third end of the no-fire selection switch is connected to the emergency control loop circuit; the fourth end of the no-fire selection switch is connected to the battery output contactor; the first end of the second contact of the parking brake release button is connected to the emergency control circuit; the second end of the second contact of the parking brake release button is connected to the parking brake release button. The second end of the first contact of the parking brake release button is connected to the brake release circuit; so that when the first end of the no-fire selection switch and the second end of the no-fire selection switch are turned on, the brake release circuit and the emergency control circuit are connected to the no-fire return control circuit of the locomotive through the second contact of the parking brake release button and the battery output contactor respectively; when the third end of the no-fire selection switch and the fourth end of the no-fire selection switch are turned on, the brake release circuit is connected to the locomotive no-fire return control circuit through the first contact of the parking brake release button, and the connection between the emergency control circuit and the locomotive no-fire return control circuit is disconnected through the emergency bypass relay and the battery output contactor. It can be seen that the present application does not need to optimize the complex on-board air brake pipeline, and can realize the function selection, interlocking and independent control between no-fire return and normal locomotive operation, and simplifies the no-fire return process of drivers and passengers, and does not need to get off the car body to handle the hand-pull release ring, which is simple and safe to operate, and improves work efficiency; at the same time, the parking release circuit is used to monitor the parking brake during no-fire return in real time and directly feedback to the driver and passengers, thereby improving the safety of the vehicle during operation.

[0045] On the basis of the above embodiments, as a preferred embodiment, as shown in Figure 2, the emergency control loop 1 includes: a first emergency loop 11, a second emergency loop 12, a first emergency relay K01 and a second emergency relay K02; the connection relationship of the circuit includes: the first end of the first emergency loop 11 is connected to the third end of the no-fire selection switch S03, the positive pole of the power supply 3 and the first end of the second contact S12 of the parking brake release button S1, the second end of the first emergency loop 11 is connected to the first end of the second emergency loop 12; the second end of the second emergency loop 12 is connected to the negative pole of the power supply 3; the first end of the first emergency relay K01 is connected to the second end of the first emergency loop 11 and the first end of the second emergency relay K02; the second end of the first emergency relay K01 is connected to the second end of the second emergency relay K02 and the first end of the second emergency loop 2.

[0046] As a preferred embodiment, as shown in FIG2 , the brake release circuit 2 includes: a parking brake release solenoid valve Y1, a parking brake release state relay K03 and a parking brake pressure switch P1. The connection relationship of the circuit is: the first end of the parking brake release solenoid valve Y1 is connected to the second end of the first contact S11 of the parking brake release button S1 and the first end of the second contact S12 of the parking brake release button S1, the second end of the parking brake release solenoid valve Y1 is connected to the first end of the parking brake release state relay K03 and the second end of the emergency bypass relay K04; the second end of the parking brake release state relay K03 is connected to the first end of the parking brake pressure switch P1; the second end of the parking brake pressure switch P1 is connected to the first end of the first contact S11 of the parking brake release button S1 and the second end of the second contact S12 of the parking brake release button S1.

[0047] In addition, in the connection relationship, the parking brake release status relay K03 also includes a contact K03-1, which is used to connect the emergency bypass relay K04 and the no-fire selection switch S03; the emergency bypass relay K04 also includes contacts K04-1, K04-2, K04-3 and K04-4, wherein K04-1 is used to connect the first emergency loop 11, the first emergency relay K01 and the second emergency relay K02; K04-2 is used to connect the first emergency relay K01, the second emergency relay K02 and the second emergency loop 12; K04-3 is used to connect the first emergency loop 11, the first emergency relay K01, the second emergency relay K02 and the positive pole of the power supply 3; K04-4 is used to connect the first emergency relay K01, the second emergency relay K02, the second emergency loop 12 and the negative pole of the power supply 3.

[0048] The overall principle of the circuit is: when the locomotive is in normal operating mode, that is, the first end of the no-fire selection switch S03 and the second end of the no-fire selection switch S03 are connected, that is, the driver and passengers can set the no-fire selection switch S03 located in the driver's cab to position 0, at this time, the battery output contactor Q01 is energized and closed, and the emergency bypass relay K04 is de-energized and disconnected. The parking brake release function of the locomotive is realized by pressing the second contact S12 of the parking brake release button S1 to energize the parking brake release solenoid valve Y1, and is synchronously monitored by the parking brake pressure switch P1; since the emergency bypass relay K04 is not energized, the emergency brake circuit of the locomotive is through the battery output contactor Q01 (+) → the first emergency loop 11 → the normally closed contact of the emergency bypass relay K04 (K04-1) → the first emergency relay K01 / the second emergency relay K02 → the normally closed contact of the emergency bypass relay K04 (K04-2) → the second emergency loop 12 → the battery output contactor Q01 (-), forming a closed-loop control to ensure that when the locomotive is in normal operating mode and when a fault occurs, the emergency control circuit 1 can work normally in time to avoid safety risks.

[0049] When the locomotive is in the fire-free return mode, that is, the third end of the fire-free selection switch S03 and the fourth end of the fire-free selection switch S03 are connected, that is, the driver and crew put the fire-free selection switch S03 in the fire-free position 45°, the normal operation mode and the fire-free return mode of the locomotive are interlocked, and the battery output contactor Q01 is disconnected at this time. The locomotive automatically applies the parking brake and emergency brake due to power failure. At this time, the parking brake of the locomotive is realized by pressing the first contact S11 of the parking brake release button S1 to energize the parking brake release solenoid valve Y1. Since the locomotive has been in the parking brake release state, the parking brake pressure switch P1 If it remains in the closed state, the parking brake release state relay K03 will be energized, and thus the emergency bypass relay K04 will be energized, the normally closed contacts (K04-1 / K04-2) of the emergency bypass relay K04 will be disconnected, and the normally open contacts (K04-3 / K04-4) of the emergency bypass relay K04 will be closed. At this time, the emergency bypass relay K04 and the battery output contactor Q01 will disconnect the emergency control circuit 1 from the locomotive's fire-free return control circuit, avoiding the problem that when the locomotive is in the fire-free return stage, the emergency control circuit is still working normally, causing wheel rubbing accidents or wheelset overheating failures, which pose a great risk to driving safety.

[0050] Among them, the circuit shown in Figure 2 also includes: a first indicator light L1, a second indicator light L2, a third indicator light L3, a first diode D1, a second diode D2, a third diode D2 and a key switch key; the connection relationship of the circuit is: the first end of the first indicator light L1 is connected to the first end of the second indicator light L2, the first end of the emergency bypass relay K04 and the first end of the first contact S11 of the parking brake release button S1; the second end of the first indicator light L1 and the second end of the second indicator light L2 are connected to the second end of the emergency bypass relay K04; the first end of the third indicator light L3 is connected to the first end of the no-fire selection switch S03 and the power supply 3, and the second end of the third indicator light L3 is connected to the second end of the emergency bypass relay K04; the positive electrode of the first diode D1 The first end of the emergency bypass relay K04 is connected, the cathode of the first diode D1 is connected to the first end of the first contact S11 of the parking brake release button S1; the anode of the second diode D2 is connected to the first end of the second contact S12 of the parking brake release button S1, and the cathode of the second diode D2 is connected to the brake release circuit 2 and the second end of the first contact S11 of the parking brake release button S1; the anode of the third diode D3 is connected to the second end of the second contact S12 of the parking brake release button S1; the cathode of the third diode D3 is connected to the first end of the first contact S11 of the parking brake release button S1; the first end of the key switch key is connected to the fourth end of the fire-free selection switch S03; the second end of the key switch key is connected to the battery output contactor Q01. Among them, the contact K03-2 in the parking brake release state relay K03 is used to connect the emergency bypass relay K04, the first indicator light L1 and the second indicator light L2.

[0051] In a specific embodiment, the functions of the first diode D1, the second diode D2, and the third diode D3 are to ensure unidirectional conduction of current in the circuit, and the functions of the first indicator light L1, the second indicator light L2, and the third indicator light L3 are that when the corresponding conditions are met, the corresponding indicator lights will change, so that the driver and passengers can judge the status of the locomotive according to the status of the indicator lights at the first time.

[0052] It should be noted that the embodiment provided in the present application is only one possible implementation method, but is not limited to only this implementation method and can be set according to the needs of the user.

[0053] The present application provides a locomotive no-fire return control circuit, comprising: an emergency control circuit, a brake release circuit, a no-fire selection switch, an emergency bypass relay and a parking brake release button; wherein the first end of the no-fire selection switch is connected to a power supply; the second end of the no-fire selection switch is connected to the first end of the emergency bypass relay and the first end of the first contact of the parking brake release button; the third end of the no-fire selection switch is connected to the emergency control loop circuit; the fourth end of the no-fire selection switch is connected to the battery output contactor; the first end of the second contact of the parking brake release button is connected to the emergency control circuit; the second end of the second contact of the parking brake release button is connected to the parking brake release button. The second end of the first contact of the parking brake release button is connected to the brake release circuit; so that when the first end of the no-fire selection switch and the second end of the no-fire selection switch are turned on, the brake release circuit and the emergency control circuit are connected to the no-fire return control circuit of the locomotive through the second contact of the parking brake release button and the battery output contactor respectively; when the third end of the no-fire selection switch and the fourth end of the no-fire selection switch are turned on, the brake release circuit is connected to the locomotive no-fire return control circuit through the first contact of the parking brake release button, and the connection between the emergency control circuit and the locomotive no-fire return control circuit is disconnected through the emergency bypass relay and the battery output contactor. It can be seen that the present application does not need to optimize the complex on-board air brake pipeline, and can realize the function selection, interlocking and independent control between no-fire return and normal locomotive operation, and simplifies the no-fire return process for drivers and passengers, and does not need to get off the car body to handle the hand-pull release ring, which is simple and safe to operate, and improves work efficiency; at the same time, the parking release circuit is used to monitor the parking brake during no-fire return in real time and directly feedback to the driver and passengers, thereby improving the safety of the vehicle during operation.

[0054] In addition, the present application also provides a means of transportation, including the above-mentioned locomotive fire-free return control circuit, and having the same beneficial effects.

[0055] Since the embodiment of the vehicle provided in this application is the same as the embodiment of the locomotive fire-free return control circuit provided above, this application will not elaborate on it here.

[0056] The above is a detailed introduction to a locomotive fireless return control circuit and a means of transportation provided by the present application. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

[0057] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A locomotive fire-free return control circuit, comprising: The emergency control circuit and brake release circuit are characterized in that they also include: a fire selection switch, an emergency bypass relay and a parking brake release button; Wherein, the first end of the no-fire selection switch is connected to the power supply; the second end of the no-fire selection switch is connected to the first end of the emergency bypass relay and the first end of the first contact of the parking brake release button; the third end of the no-fire selection switch is connected to the emergency control loop circuit; the fourth end of the no-fire selection switch is connected to the battery output contactor; The first end of the second contact of the parking brake release button is connected to the emergency control circuit; the second end of the second contact of the parking brake release button is connected to the second end of the first contact of the parking brake release button and the brake release circuit; so that when the first end of the no-fire selection switch and the second end of the no-fire selection switch are turned on, the brake release circuit and the emergency control circuit are respectively connected to the locomotive no-fire return control circuit through the second contact of the parking brake release button and the battery output contactor; when the third end of the no-fire selection switch and the fourth end of the no-fire selection switch are turned on, the brake release circuit is connected to the locomotive no-fire return control circuit through the first contact of the parking brake release button, and the connection between the emergency control circuit and the locomotive no-fire return control circuit is disconnected through the emergency bypass relay and the battery output contactor.

2. The locomotive fire return control circuit according to claim 1, characterized in that: The emergency control loop includes: a first emergency loop and a second emergency loop; Wherein, the first end of the first emergency loop is connected to the third end of the no-fire selection switch, the positive electrode of the power supply and the first end of the second contact of the parking brake release button, and the second end of the first emergency loop is connected to the first end of the second emergency loop; The second end of the second emergency loop is connected to the negative pole of the power supply.

3. The locomotive fire return control circuit according to claim 2, characterized in that: The emergency control circuit also includes: a first emergency relay and a second emergency relay; wherein the first end of the first emergency relay is connected to the second end of the first emergency loop and the first end of the second emergency relay; The second end of the first emergency relay is connected to the second end of the second emergency relay and the first end of the second emergency loop.

4. The locomotive fire return control circuit according to claim 1, characterized in that: The brake relief circuit includes: a parking brake relief solenoid valve, a parking brake relief state relay and a parking brake pressure switch; Wherein, the first end of the parking brake release solenoid valve is connected to the second end of the first contact of the parking brake release button and the first end of the second contact of the parking brake release button, and the second end of the parking brake release solenoid valve is connected to the first end of the parking brake release state relay and the second end of the emergency bypass relay; The second end of the parking brake release state relay is connected to the first end of the parking brake pressure switch; The second end of the parking brake pressure switch is connected to the first end of the first contact of the parking brake release button and the second end of the second contact of the parking brake release button.

5. The locomotive fire return control circuit according to claim 1, characterized in that: Also includes: a first indicator light and a second indicator light; Wherein, the first end of the first indicator light is connected to the first end of the second indicator light, the first end of the emergency bypass relay and the first end of the first contact of the parking brake release button; The second end of the first indicator light and the second end of the second indicator light are connected to the second end of the emergency bypass relay.

6. The locomotive fire return control circuit according to claim 1, characterized in that: Also includes: The third indicator light; Wherein, the first end of the third indicator light is connected to the first end of the no-fire selection switch and the power supply, and the second end of the third indicator light is connected to the second end of the emergency bypass relay.

7. The locomotive fire return control circuit according to claim 1, characterized in that: Also includes: a first diode and a second diode; Wherein, the anode of the first diode is connected to the first end of the emergency bypass relay, and the cathode of the first diode is connected to the first end of the first contact of the parking brake release button; The anode of the second diode is connected to the first end of the second contact of the parking brake release button, and the cathode of the second diode is connected to the brake release circuit and the second end of the first contact of the parking brake release button.

8. The locomotive fire return control circuit according to claim 1, characterized in that: Also included: a third diode; Wherein, the anode of the third diode is connected to the second end of the second contact of the parking brake release button; The cathode of the third diode is connected to the first end of the first contact of the parking brake release button.

9. The locomotive fire return control circuit according to any one of claims 1 to 8, characterized in that: Also includes: Key switch; Wherein, the first end of the key switch is connected to the fourth end of the no-fire selection switch; The second end of the key switch is connected to the battery output contactor.

10. A means of transport, characterized in that: It comprises the locomotive fire-free return control circuit as described in any one of claims 1-9.

Images