CN115571105A - Device for relieving emergency braking of motor train unit and motor train unit - Google Patents

Abstract

The invention discloses a device for relieving emergency braking of a motor train unit and the motor train unit, and relates to the technical field of the motor train unit, wherein the device comprises a loop bypass switch, a loop relay and an emergency braking loop, when a passenger triggers an emergency braking handle by mistake, a coil of the loop relay loses power, and the emergency braking loop controls the motor train unit to brake emergently after detecting that the coil of the loop relay loses power; and the mechanic determines that after the passenger triggers the emergency brake handle by mistake, the normally open contact of the loop bypass switch is closed by triggering the loop bypass switch, so that the coil of the loop relay is electrified, and the emergency brake loop detects that the coil of the loop relay is electrified, so that the brake of the motor train unit is relieved. Therefore, when the passenger triggers the emergency brake handle by mistake, a mechanic does not need to go to the compartment triggered by the emergency brake handle to manually restore the emergency brake handle to the state when the emergency brake handle is not triggered, time and labor are saved, and the normal operation of the motor train unit is not influenced for a long time.

Description

Device for relieving emergency braking of motor train unit and motor train unit

Technical Field

The invention relates to the technical field of motor train units, in particular to a device for relieving emergency braking of a motor train unit and the motor train unit.

Background

An emergency brake handle is usually arranged in a carriage of the motor train unit, so that passengers brake the motor train unit by triggering the emergency brake handle in case of emergency. However, in the running process of the motor train unit, passengers may trigger the emergency brake handle in the compartment by mistake to enable the motor train unit to be braked emergently, but the passengers do not have the authority of restoring the emergency brake handle to the state when the emergency brake handle is not triggered, so that a mechanic is required to check whether the motor train unit is not abnormal or not if the emergency brake of the motor train unit is relieved, and then the passengers go to the compartment with the triggered emergency brake handle to manually restore the emergency brake handle to the state when the emergency brake handle is not triggered. However, the method is time-consuming and labor-consuming, and the normal operation of the motor train unit can be influenced for a long time in the process of relieving the emergency braking of the motor train unit.

Disclosure of Invention

The invention aims to provide a device for relieving emergency braking of a motor train unit and the motor train unit, wherein a mechanic does not need to go to a compartment with an emergency brake handle triggered to manually restore the emergency brake handle to a state without triggering when a passenger triggers the emergency brake handle by mistake, time and labor are saved, and the normal operation of the motor train unit is not influenced for a long time.

In order to solve the technical problem, the invention provides a device for relieving emergency braking of a motor train unit, which comprises a loop bypass switch, a loop relay and an emergency braking loop, wherein the loop bypass switch is connected with the loop relay;

normally closed contacts of emergency brake handles in each compartment of the motor train unit are sequentially connected in series, a first end of a circuit after the circuit is connected in series is connected with a first end of a normally closed contact of a loop bypass switch, a second end of the normally closed contact of the loop bypass switch is connected with a first end of a normally open contact of the loop bypass switch, and a coil of a loop relay is connected between a second end of the normally open contact of the loop bypass switch and a second end of the circuit after the normally closed contacts of the emergency brake handles are sequentially connected in series;

the second end of the normally closed contact of the loop bypass switch and the second end of the circuit after the normally closed contacts of the emergency brake handles are sequentially connected in series are connected with a first power supply device;

the emergency braking loop is used for controlling the motor train unit to brake when the coil of the loop relay is in power failure, and relieving the brake of the motor train unit when the coil of the loop relay is in power on.

Preferably, the emergency braking loop comprises an emergency braking relay and an emergency braking control device;

a normally open contact of the loop relay is connected with a coil of the emergency braking relay in series, and two ends of a circuit after the circuit is connected with a second power supply device;

the emergency brake control device is used for controlling the motor train unit to brake when detecting that the normally open contact of the emergency brake relay is opened, and relieving the brake of the motor train unit when detecting that the normally open contact of the emergency brake relay is closed.

Preferably, the emergency braking loop further comprises a bypass switch, a short-circuit relay and a short-circuit relay control device;

the short-circuit relay control device is used for controlling a coil of the short-circuit relay to be electrified when the bypass switch is detected to be closed;

and the normally open contact of the short circuit relay is connected in parallel with the two ends of the coil of the loop relay.

Preferably, the short-circuit relay control device is further configured to detect a triggered number of times that the bypass switch is switched from open to closed, and control the coil of the short-circuit relay to maintain a power-off state when the triggered number of times is greater than a preset threshold.

Preferably, the system further comprises a first brake breaker and a second brake breaker;

the first brake circuit breaker and the second brake circuit breaker are respectively arranged between two ends of a circuit formed by connecting the normally open contact of the loop relay and the coil of the emergency brake relay in series and the second power supply device.

Preferably, the system also comprises an emergency alarm host, a first communication device arranged in each passenger compartment and a second communication device arranged in a working compartment of the motor train unit;

the emergency alarm host is used for controlling the first communication device to establish communication connection with the second communication device when detecting that the emergency brake handle is triggered.

Preferably, the method further comprises the following steps:

and the alarm device is used for generating alarm information when the emergency brake handle is detected to be triggered.

Preferably, the method further comprises the following steps:

and the emergency brake recording device is used for recording any one or more of time when the emergency brake handle is triggered, time when the motor train unit is braked and time when the motor train unit is braked in a releasing way when the emergency brake handle is detected to be triggered.

Preferably, the system further comprises a third brake breaker and a fourth brake breaker;

the third brake circuit breaker set up in first power supply unit with between the normally closed contact of loop bypass switch, the fourth brake circuit breaker set up in first power supply unit and each between the second end of the circuit after the normally closed contact of emergency brake handle establishes ties in proper order.

In order to solve the technical problem, the application further provides the motor train unit, which comprises the device for relieving the emergency braking of the motor train unit and also comprises emergency braking handles arranged in each carriage of the motor train unit;

the first end of the circuit after the normally closed contacts of the emergency brake handles are connected in series is connected with the first end of the normally closed contact of the loop bypass switch, and the second end of the circuit after the normally closed contacts of the emergency brake handles are sequentially connected in series is connected with the coil of the loop relay.

In conclusion, the invention provides a device for relieving emergency braking of a motor train unit and the motor train unit, and the device comprises a loop bypass switch, a loop relay and an emergency braking loop, wherein when a passenger triggers an emergency braking handle by mistake, a coil of the loop relay loses power, and the emergency braking loop detects that the coil of the loop relay loses power and then controls the motor train unit to brake emergently; and the mechanic determines that after the passenger triggers the emergency brake handle by mistake, the normally open contact of the loop bypass switch is closed by triggering the loop bypass switch, so that the coil of the loop relay is electrified, and the emergency brake loop detects that the coil of the loop relay is electrified, so that the brake of the motor train unit is relieved. Therefore, when the passenger triggers the emergency brake handle by mistake, a mechanic does not need to go to the compartment triggered by the emergency brake handle to manually restore the emergency brake handle to the state when the emergency brake handle is not triggered, time and labor are saved, and the normal operation of the motor train unit is not influenced for a long time.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a device for relieving emergency braking of a motor train unit provided by the invention;

FIG. 2 is a schematic structural diagram of another device for relieving emergency braking of a motor train unit provided by the invention;

FIG. 3 is a schematic view of a working process of the device for relieving emergency braking of the motor train unit provided by the present application.

Detailed Description

The core of the invention is to provide the device for relieving the emergency braking of the motor train unit and the motor train unit, when a passenger triggers the emergency braking handle by mistake, a mechanic does not need to go to the compartment with the triggered emergency braking handle to manually restore the emergency braking handle to the state without triggering, time and labor are saved, and the normal operation of the motor train unit is not influenced for a long time.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a device for relieving emergency braking of a motor train unit, which includes a loop bypass switch S2, a loop relay R1 and an emergency braking loop;

normally closed contacts of emergency brake handles S1 in each compartment of the motor train unit are sequentially connected in series, a first end of a circuit after series connection is connected with a first end of a normally closed contact of a loop bypass switch S2, a second end of the normally closed contact of the loop bypass switch S2 is connected with a first end of a normally open contact of the loop bypass switch S2, and a coil of a loop relay R1 is connected between a second end of the normally open contact of the loop bypass switch S2 and a second end of a circuit after the normally closed contacts of the emergency brake handles S1 are sequentially connected in series;

the second end of the circuit, which is formed by sequentially connecting the second ends of the normally closed contacts of the loop bypass switch S2 and the normally closed contacts of the emergency brake handles S1 in series, is connected with a first power supply device;

the emergency braking loop is used for controlling the braking of the motor train unit when the coil of the loop relay R1 is powered off, and the braking of the motor train unit is relieved when the coil of the loop relay R1 is powered on.

In consideration of the fact that passengers do not have the right to restore the emergency brake handle S1 to the non-triggered state in the prior art, when the passengers trigger the emergency brake handle S1 by mistake, workers in the motor train unit need to go to the compartment where the emergency brake handle S1 is triggered to restore the emergency brake handle S1 to the non-triggered state after confirming that the motor train unit is really abnormal, so that braking of the motor train unit is relieved, the whole process is time-consuming and labor-consuming, and the operation order of the motor train unit can be influenced.

The function of realizing braking or relieving braking of the motor train unit based on the state of the emergency brake handle S1 in the motor train unit is realized by the cooperation of an emergency alarm loop and an emergency brake loop. The loop bypass switch S2 and the loop relay R1 belong to an emergency alarm loop, the emergency alarm loop has the main function of controlling whether a coil of the loop relay R1 is electrified or not based on the state of an emergency brake handle S1, and the emergency brake loop has the main function of controlling whether the motor train unit is braked or the motor train unit is relieved to brake based on the electrified state of the coil of the loop relay R1.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a device for relieving emergency braking of a motor train unit provided by the invention. When a passenger triggers the emergency brake handle S1 by mistake, the normally closed contact of the emergency brake handle S1 on the emergency alarm loop is disconnected, when the loop bypass switch S2 is not triggered, the normally closed contact of the loop bypass switch S2 connected with the normally closed contact of the emergency brake handle S1 in series is continuously kept closed, the normally open contact of the loop bypass switch S2 is kept disconnected, the coil of the loop relay R1 in the emergency alarm loop is in a power-off state, and when the emergency brake loop detects that the coil of the loop relay R1 in the emergency alarm loop is in the power-off state, the motor train unit is controlled to brake. When workers in the motor train unit know that the emergency brake handle S1 is triggered by passengers by mistake and want to relieve braking of the motor train unit, the workers can trigger the loop bypass switch S2, the normally closed contact of the loop bypass switch S2 connected with the normally closed contact of the emergency brake handle S1 in the emergency alarm loop is disconnected, the normally open contact of the loop bypass switch S2 is closed, so that the first power supply device can supply power to the coil of the loop relay R1, and the coil of the loop relay R1 is in a power-on state, so that the emergency brake loop can relieve braking of the motor train unit. Therefore, when the brake of the motor train unit is relieved by workers, the workers do not need to go to the compartment triggered by the emergency handle of the passenger, the time and the labor are saved in the process of relieving the brake of the motor train unit, and the loop bypass switches S2 can be arranged in the power distribution cabinets at the two ends of the motor train unit to further relieve the work load of the workers.

In the present application, the specific circuit configuration of the emergency brake loop is not particularly limited, and the emergency brake loop may have a function of controlling braking of the motor train unit when the coil of the loop relay R1 is powered off, and releasing braking of the motor train unit when the coil of the loop relay R1 is powered on.

In conclusion, the invention provides a device for relieving emergency braking of a motor train unit, which comprises a loop bypass switch S2, a loop relay R1 and an emergency braking loop, wherein when a passenger triggers an emergency braking handle S1 by mistake, a coil of the loop relay R1 is powered off, and the emergency braking loop controls the motor train unit to brake emergently after detecting that the coil of the loop relay R1 is powered off; and the mechanic determines that after the emergency brake handle S1 is triggered by mistake, the passenger triggers the loop bypass switch S2 to close the normally open contact of the loop bypass switch S2, so that the coil of the loop relay R1 is electrified, and the emergency brake loop detects that the coil of the loop relay R1 is electrified, so that the brake of the motor train unit is relieved. Therefore, when the passenger triggers the emergency brake handle S1 by mistake, a mechanic does not need to go to the compartment triggered by the emergency brake handle S1 to manually restore the emergency brake handle S1 to the state when the emergency brake handle S1 is not triggered, time and labor are saved, and the normal operation of the motor train unit is not influenced for a long time.

On the basis of the above-described embodiment:

as a preferred embodiment, the emergency braking loop comprises an emergency braking relay R2 and an emergency braking control device;

a normally open contact of the loop relay R1 is connected with a coil of the emergency braking relay R2 in series, and two ends of a circuit after the circuit is connected with the second power supply device;

the emergency brake control device is used for controlling the motor train unit to brake when detecting that the normally open contact of the emergency brake relay R2 is opened, and relieving the brake of the motor train unit when detecting that the normally open contact of the emergency brake relay R2 is closed.

Referring to fig. 2, fig. 2 is a schematic structural view of another device for relieving emergency braking of a motor train unit provided by the invention. The embodiment provides a specific implementation circuit of an emergency braking loop, and the emergency braking loop comprises an emergency braking relay R2 and an emergency braking control device. Specifically, loop relay R1 ' S in the emergency warning loop normally open contact and emergency brake relay R2 ' S coil are established ties, consequently loop relay R1 ' S coil is in the power failure state after emergency brake handle S1 is triggered, loop relay R1 ' S normally open contact is the off-state, consequently emergency brake relay R2 ' S coil also is in the power failure state, emergency brake relay R2 ' S normally open contact disconnection, emergency brake controlling means controls EMUs braking when detecting emergency brake relay R2 ' S normally open contact disconnection. When workers in the motor train unit trigger the loop bypass switch S2, the coil of the loop relay R1 in the emergency alarm loop is electrified, the normally open contact of the loop relay R1 in the emergency brake loop is closed, therefore, the coil of the emergency brake relay R2 is electrified to enable the normally open contact of the emergency brake relay R2 to be closed, and the emergency brake control device relieves the braking of the motor train unit when detecting that the normally open contact of the emergency brake relay R2 is closed.

In conclusion, the embodiment realizes the functions of braking and brake relieving of the motor train unit through the emergency brake relay R2 and the emergency brake control device, and has the advantage of simple circuit structure.

As a preferred embodiment, the emergency braking loop further comprises a bypass switch S3, a short-circuit relay R3 and a short-circuit relay R3 control device;

the short-circuit relay R3 control device is used for controlling the coil of the short-circuit relay R3 to be electrified when the bypass switch S3 is detected to be closed;

and the normally open contact of the short-circuit relay R3 is connected in parallel with the two ends of the coil of the loop relay R1.

Considering that the loop relay R1 in the emergency alarm loop may be abnormal in the running process of the motor train unit, and further may affect the braking of the motor train unit or the function of relieving the braking, in this embodiment, a loop bypass switch S2, a short-circuit relay R3 and a short-circuit relay R3 control device are additionally arranged in the emergency brake loop to cut off the loop relay R1, so that the normal running of the motor train unit can be ensured when the loop relay R1 is abnormal.

Referring to fig. 2, fig. 2 is a schematic structural diagram of another device for relieving emergency braking of a motor train unit provided by the invention. Referring to fig. 3, fig. 3 is a schematic view of a working process of the device for relieving emergency braking of the motor train unit provided by the present application. Specifically, when the loop relay R1 is abnormal and the function of relieving the braking of the motor train unit can not be realized by triggering the loop bypass switch S2 in the emergency alarm loop, a worker in the motor train unit can also trigger the bypass switch S3 in the emergency brake loop, the coil of the short-circuit relay R3 is controlled to be electrified when the short-circuit relay R3 detects that the loop bypass switch S2 is closed, the normally open contact of the short-circuit relay R3 is connected in parallel with the two ends of the coil of the loop relay R1, therefore, when the coil of the short-circuit relay R3 is electrified, the normally open contact of the short-circuit relay R3 is closed, so that the coil of the loop relay R1 is electrified, and the emergency brake loop relieves the braking of the motor train unit after the coil of the loop relay R1 is electrified. Therefore, the braking of the motor train unit can be normally relieved when the loop relay R1 is abnormal, and the motor train unit can safely and stably run.

As a preferred embodiment, the shorting relay R3 control device is further configured to detect a triggered number of times that the bypass switch S3 is switched from open to closed, and control the coil of the shorting relay R3 to maintain a power-off state when the triggered number of times is greater than a preset threshold.

In order to improve the running reliability of the motor train unit, in the embodiment, when the condition that the loop bypass switch S2 is triggered by a worker for multiple times to relieve the braking of the motor train unit is detected, the motor train unit is forcibly braked by the short-circuit relay R3 control device, so that the worker can recover the running of the motor train unit after manually checking whether the motor train unit is actually abnormal or not.

Specifically, the control device of the short-circuit relay R3 can detect the number of times that the bypass switch S3 is triggered, and control the coil of the short-circuit relay R3 to keep a power-off state when the number of times that is triggered is greater than a preset threshold value, so that the coil of the short-circuit relay R3 cannot be powered even when a worker triggers the bypass switch S3, the normally open contact of the short-circuit relay R3 cannot be closed, and the coil of the loop relay R1 is also in the power-off state when a motor train brakes, so that the coil of the emergency brake relay R2 is also in the power-off state, the emergency brake loop detects that the coil of the emergency brake relay R2 is always kept in the power-off state, the brake train is kept to brake, and then the worker is prompted to check whether the motor train unit is actually abnormal or not, and the running reliability and safety of the motor train unit are guaranteed.

As a preferred embodiment, a first brake chopper D1 and a second brake chopper D2 are further included;

the first brake circuit breaker D1 and the second brake circuit breaker D2 are respectively arranged between the two ends of a circuit formed by connecting the normally open contact of the loop relay R1 and the coil of the emergency brake relay R2 in series and the second power supply device.

Referring to fig. 2, fig. 2 is a schematic structural view of another device for relieving emergency braking of a motor train unit provided by the invention. In this embodiment, the circuit breakers are arranged at the connection positions of the two ends of the circuit, in which the normally open contact of the loop relay R1 is connected in series with the coil of the emergency brake relay R2, of the circuit and the second power supply device, and the circuit breakers can cut off the connection between the second power supply device and other circuits when the current in the circuit is too large or other abnormalities are detected in the circuit, so that the safety of other circuit devices in the emergency brake loop is ensured, and further, the safety of the motor train unit is ensured. The specific type of the circuit breaker is not particularly limited in the present application, and may be selected according to an actual application scenario.

As a preferred embodiment, the emergency alarm system further comprises an emergency alarm host, a first communication device arranged in each passenger compartment and a second communication device arranged in a working compartment of the motor train unit;

the emergency alarm host is used for controlling the first communication device to establish communication connection with the second communication device when detecting that the emergency brake handle S1 is triggered.

In this embodiment, in order to enable staff in the motor train unit to communicate with passengers in the motor train unit in time when the motor train unit has an emergency, an emergency alarm host, a first communication device and a second communication device are arranged in the motor train unit. When the emergency alarm host detects that the emergency brake handle S1 is triggered, the emergency alarm host can control the first communication device and the second communication device to establish communication connection, so that workers in a working compartment of the motor train unit can communicate with passengers in the passenger compartment in time, and can know and handle abnormal conditions occurring in the motor train unit in time.

The specific type of the first communication device and the second communication device is not particularly limited in this application, and the communication device is, for example, a contact phone or an alarm panel having a speaker and a sound pickup function.

As a preferred embodiment, further comprising:

and the alarm device is used for generating alarm information when the emergency brake handle S1 is detected to be triggered.

In the embodiment, the motor train unit is further provided with an alarm device, when the emergency brake handle S1 is triggered, alarm information can be generated, so that workers and other passengers in the motor train unit can know the conditions in time, and the safety of the motor train unit and the passengers in the motor train unit is further ensured. The alarm device may be a voice broadcast system or a display screen, and the comparison of the present application is not particularly limited.

As a preferred embodiment, the method further comprises the following steps:

and the emergency brake recording device is used for recording any one or more of the time when the emergency brake handle S1 is triggered, the time when the motor train unit is braked and the time when the motor train unit is braked in a releasing way when the emergency brake handle S1 is detected to be triggered.

In order to analyze the working condition of the motor train unit after the motor train unit is abnormal, so as to further investigate the abnormal condition which may occur to the motor train unit, the emergency brake recording device is further arranged in the embodiment, and when the emergency brake recording device detects that the emergency brake handle S1 is triggered, the emergency brake recording device records any one or combination of a time when the emergency brake handle S1 is triggered, a time when the motor train unit is braked and a time when the motor train unit is braked in a releasing manner, so that the staff can analyze whether the abnormal condition exists in the compartment which often triggers the emergency brake handle S1 in the motor train unit, and the like, and further ensure the safety and reliability of the operation of the motor train unit.

As a preferred embodiment, a third brake breaker D3 and a fourth brake breaker D4 are further included;

the third brake circuit breaker D3 is arranged between the first power supply device and the normally closed contacts of the loop bypass switch S2, and the fourth brake circuit breaker D4 is arranged between the first power supply device and the second ends of the circuits after the normally closed contacts of the emergency brake handles S1 are sequentially connected in series.

Referring to fig. 1, fig. 1 is a schematic structural view of a device for relieving emergency braking of a motor train unit provided by the invention. In this embodiment, a third brake circuit breaker D3 and a fourth brake circuit breaker D4 are further disposed in the emergency alarm loop, wherein the third brake circuit breaker D3 is disposed between the first power supply device and the normally closed contact of the loop bypass switch S2, so that when an abnormality occurs in a circuit between the first power supply device and the normally closed contact of the loop bypass switch S2, the circuit can be timely disconnected, thereby ensuring safety of the loop bypass switch S2; the fourth brake circuit breaker D4 is arranged between the first power supply device and the second ends of the circuits after the normally closed contacts of the emergency brake handles S1 are sequentially connected in series, so that when the circuit between the first power supply device and the second ends of the circuits after the normally closed contacts of the emergency brake handles S1 are sequentially connected in series is detected to be abnormal, the circuit is timely disconnected to ensure the safety of the normally closed contacts of the emergency brake handles S1, and further the safety of the whole emergency alarm loop in the motor train unit and the safety of the motor train unit in operation are ensured.

The application also provides a motor train unit, which comprises the device for relieving the emergency braking of the motor train unit and also comprises emergency braking handles S1 arranged in each compartment of the motor train unit;

the first end of the circuit after the normally closed contacts of the emergency brake handles S1 are connected in series is connected with the first end of the normally closed contact of the loop bypass switch S2, and the second end of the circuit after the normally closed contacts of the emergency brake handles S1 are sequentially connected in series is connected with the coil of the loop relay R1.

For the related introduction of the motor train unit provided by the present application, please refer to the related embodiments of the device for relieving the emergency braking of the motor train unit, which are not described herein again.

It is to be noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A device for relieving emergency braking of a motor train unit is characterized by comprising a loop bypass switch, a loop relay and an emergency braking loop;

normally closed contacts of emergency brake handles in each compartment of the motor train unit are sequentially connected in series, a first end of a circuit after the circuit is connected in series is connected with a first end of a normally closed contact of a loop bypass switch, a second end of the normally closed contact of the loop bypass switch is connected with a first end of a normally open contact of the loop bypass switch, and a coil of a loop relay is connected between a second end of the normally open contact of the loop bypass switch and a second end of the circuit after the normally closed contacts of the emergency brake handles are sequentially connected in series;

the second end of the normally closed contact of the loop bypass switch and the second end of the circuit after the normally closed contacts of the emergency brake handles are sequentially connected in series are connected with a first power supply device;

the emergency braking loop is used for controlling the motor train unit to brake when the coil of the loop relay is in power failure, and relieving the brake of the motor train unit when the coil of the loop relay is in power on.

2. The device for relieving emergency braking of a motor train unit according to claim 1, wherein the emergency brake loop comprises an emergency brake relay and an emergency brake control device;

a normally open contact of the loop relay is connected with a coil of the emergency braking relay in series, and two ends of a circuit after the circuit is connected with a second power supply device;

the emergency brake control device is used for controlling the motor train unit to brake when detecting that the normally open contact of the emergency brake relay is opened, and relieving the brake of the motor train unit when detecting that the normally open contact of the emergency brake relay is closed.

3. The device for relieving emergency braking of a motor train unit according to claim 2, wherein the emergency braking loop further comprises a bypass switch, a short-circuit relay and a short-circuit relay control device;

the short-circuit relay control device is used for controlling a coil of the short-circuit relay to be electrified when the bypass switch is detected to be closed;

and the normally open contact of the short circuit relay is connected in parallel with the two ends of the coil of the loop relay.

4. The device for relieving emergency braking of motor train unit according to claim 3, wherein the short-circuit relay control device is further configured to detect the number of triggered times that the bypass switch is switched from open to closed, and control the coil of the short-circuit relay to maintain a power-off state when the number of triggered times is greater than a preset threshold value.

5. The device for relieving emergency braking of a motor train unit of claim 2, further comprising a first brake circuit breaker and a second brake circuit breaker;

the first brake circuit breaker and the second brake circuit breaker are respectively arranged between two ends of a circuit formed by connecting the normally open contact of the loop relay and the coil of the emergency brake relay in series and the second power supply device.

6. The device for relieving emergency braking of a motor train unit according to claim 1, further comprising an emergency alarm main unit, a first communication device disposed in each passenger compartment, and a second communication device disposed in a working compartment of the motor train unit;

the emergency alarm host is used for controlling the first communication device to establish communication connection with the second communication device when detecting that the emergency brake handle is triggered.

7. The device for relieving emergency braking of a motor train unit according to claim 1, further comprising:

and the alarm device is used for generating alarm information when the emergency brake handle is detected to be triggered.

8. The device for relieving emergency braking of a motor train unit according to claim 1, further comprising:

and the emergency brake recording device is used for recording any one or more of time when the emergency brake handle is triggered, time when the motor train unit is braked and time when the motor train unit is braked in a releasing way when the emergency brake handle is detected to be triggered.

9. The device for relieving emergency braking of motor train unit according to any one of claims 1 to 8, further comprising a third brake circuit breaker and a fourth brake circuit breaker;

the third brake circuit breaker set up in first power supply unit with between the normally closed contact of loop bypass switch, the fourth brake circuit breaker set up in first power supply unit and each between the second end of the circuit after the normally closed contact of emergency brake handle establishes ties in proper order.

10. A motor train unit, characterized by comprising the device for relieving emergency braking of the motor train unit according to any one of claims 1 to 9, and further comprising emergency brake handles arranged in each compartment of the motor train unit;

the first end of the circuit after the normally closed contacts of the emergency brake handles are connected in series is connected with the first end of the normally closed contact of the loop bypass switch, and the second end of the circuit after the normally closed contacts of the emergency brake handles are sequentially connected in series is connected with the coil of the loop relay.

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