WO2020119043A1

WO2020119043A1 - Rail train

Info

Publication number: WO2020119043A1
Application number: PCT/CN2019/090824
Authority: WO
Inventors: 范乐天; 潘乐; 董长禄; 王力; 姜茹佳; 李进伏; 陈静; 侯丽娴
Original assignee: 中车唐山机车车辆有限公司
Priority date: 2018-12-13
Filing date: 2019-06-12
Publication date: 2020-06-18
Also published as: CN111319642B; CN111319642A

Abstract

A rail train, comprising: compartments (10), mounting ports (11) being provided on side portions of the compartments (10), and devices for generating a gas being fixed, in the compartments (10), at positions behind the mounting ports (11); and ventilation structures mounted at the mounting ports (11). Each ventilation structure comprises a cover plate (100) and a stop member (200). The cover plate (100) has a cover plate ventilation hole (110). The stop member (200) is provided on the side of the cover plate (100) facing the body of the compartment. The lower portion of the stop member (200) and the cover plate (100) are sealably fixed below the cover plate ventilation hole (110). The side portion of the stop member (200) and the cover plate (100) are sealably fixed outside a side end of the cover plate ventilation hole (110). A stop member body (210) between the lower portion and the side portion of the stop member (200) is used for receiving a liquid entering from the cover plate ventilation hole (110) and stopping the liquid from entering the side of the stop member body (210) away from the cover plate (100), thereby stopping the liquid from entering the body of the compartment (10). The rail train resolves the technical problem of damages to devices in a rail train due to the entrance of a liquid outside the train into the train caused by the ventilation of the train.

Description

Rail train

Technical field

This application relates to the technical field of electric locomotives, in particular, to a rail train.

Background technique

Various equipments are fixed in the train body, some of them will release gas, and it is necessary to set up a ventilation structure to discharge the gas released by the equipment out of the train. The ventilation structure exhausts the gas out of the train through the ventilation holes, and the rainwater outside the train, water for cleaning the train, and other liquids will also enter the train through the ventilation holes, thereby causing damage to the equipment in the train.

Therefore, the ventilation of the rail train causes the liquid outside the train to enter the train and damage the equipment in the train, which is a technical problem that those skilled in the art urgently need to solve.

The above information disclosed in the background art is only used to enhance the understanding of the background of the present application, so it may contain information that does not form related technology known to those of ordinary skill in the art.

Summary of the invention

An embodiment of the present application provides a rail train to solve the technical problem that the ventilation of the rail train causes the liquid outside the train to enter the train and damage the equipment in the train.

An embodiment of the present application provides a rail train, including:

A carriage, an installation opening is provided on the side of the carriage, and a gas generating device is fixed in a position behind the installation opening in the carriage;

A ventilation structure is installed at the installation port; the ventilation structure includes a cover plate and a blocking member, the cover plate has a cover plate ventilation hole, the blocking member is disposed on the cover plate facing the body of the vehicle body On one side, the lower part of the blocking member and the cover plate are sealed and fixed under the cover plate vent hole, and the side portion of the blocking member and the cover plate are outside the side ends of the cover plate vent hole Sealed and fixed;

Wherein, the barrier body between the lower part and the side of the barrier is used to receive the liquid entering from the vent hole of the cover plate and block the liquid from entering the side of the barrier body away from the cover plate , Thereby blocking the liquid from entering the body of the car.

The embodiments of the present application have the following technical effects due to the adoption of the above technical solutions:

An installation opening is provided on the side of the vehicle compartment, and a device that generates gas is fixed in a position behind the installation opening in the vehicle compartment. The ventilation structure is installed at the installation opening; the ventilation structure includes a cover plate and a blocking member; wherein, the cover plate has a cover plate vent, and the blocking member is provided at a side of the body of the cover plate facing the car body Side, the lower part of the blocking member and the cover plate are sealed and fixed under the cover plate vent hole, the side of the blocking member and the cover plate are sealed outside the side end of the cover plate vent hole Fixed; the barrier body between the lower part and the side of the barrier is used to receive the liquid that enters from the vent hole of the cover plate, blocking the liquid from entering the side of the barrier body away from the cover plate , Thereby blocking liquid from entering the body of the car. Compared with the background art, the ventilation structure of the rail train of the embodiment of the present application adds a blocking member, and the blocking member blocks the liquid entering from the vent holes of the cover plate from entering the side of the blocking member away from the cover plate, and The liquid is blocked from entering the body of the car, and the damage to the equipment in the train from the liquid entering the ventilation structure is avoided.

BRIEF DESCRIPTION

The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute an undue limitation on the present application. In the drawings:

1 is a schematic diagram of a rail train according to an embodiment of the application;

FIG. 2 is a schematic diagram of the vent structure without the installation of the rail train shown in FIG. 1;

Figure 3 is an enlarged schematic view of the installation port shown in Figure 2;

4 is an enlarged schematic diagram of the ventilation structure of the rail train shown in FIG. 1;

5 is a cross-sectional view taken along line A-A of the ventilation structure shown in FIG. 4;

6 is a schematic diagram of the ventilation structure of the rail train shown in FIG. 1;

7 is a partial enlarged view of FIG. 5;

8 is a schematic diagram of a second foldable foldable foldable hinge shown in FIG. 3;

9 is a schematic diagram of the change state of the second folding shown in FIG. 8;

FIG. 10 is a schematic diagram of cooperation between a first fold and a second fold of a separable fold of a rail train according to an embodiment of the present application.

Reference mark:

10 compartments, 11 installation ports, 100 cover plates, 110 cover plate ventilation holes, 120 waterproof sealing strips, 130 liquid outlets;

200 stopper, 210 stopper body, 211 plate-like part, 212 lower inclined part, 221 lower closed end, 230 stopper ventilation hole;

300 top vents;

410 First Fold, 411 First Flap, 412 Shaft Tube, 420 Second Fold, 421 Second Flap, 422 Shaft Tube, 423 Retractable Shaft, 424 Handle, 425 Limit Opening, 426 Spring, 427 Card groove;

500 locking structure.

detailed description

In order to make the technical solutions and advantages in the embodiments of the present application more clear, the following describes the exemplary embodiments of the present application in further detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and Not exhaustive of all embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other if there is no conflict.

Example one

FIG. 1 is a schematic diagram of a rail train according to an embodiment of the present application; FIG. 2 is a schematic diagram of the installation opening of the rail train shown in FIG. 1 without a ventilation structure; FIG. 3 is an enlarged schematic diagram of the installation opening shown in FIG. 2; FIG. 4 1 is an enlarged schematic view of the ventilation structure of the rail train shown in FIG. 1; FIG. 5 is an AA sectional view of the ventilation structure shown in FIG. 4; FIG. 6 is a schematic view of the ventilation structure of the rail train shown in FIG.

The rail train according to the embodiment of the present application, as shown in FIG. 1, FIG. 2 and FIG. 3, includes:

In the compartment 10, an installation port 11 is provided on the side of the compartment, and a device that generates gas is fixed in a position behind the installation port 11 in the compartment 10;

The ventilation structure is installed at the installation port 11; as shown in FIG. 4, FIG. 5 and FIG. 6, the ventilation structure includes a cover plate 100 and a blocking member 200, and the cover plate 100 has a cover plate ventilation hole 110. The blocking member 200 is provided on the side of the cover plate facing the body of the car, the lower part of the blocking member and the cover plate are sealed and fixed under the cover plate ventilation hole, and the side of the blocking member The part and the cover plate are sealed and fixed outside the side ends of the ventilation holes of the cover plate;

Wherein, the barrier body 210 between the lower part and the side of the barrier is used to receive the liquid that enters from the cover plate vent hole 110 to block the liquid from entering the barrier body 210 away from the cover plate Side, which in turn blocks the liquid from entering the body of the compartment.

Example 2

The rail train of the embodiment of the present application includes a carriage and a ventilation structure. An installation opening is provided on the side of the vehicle compartment, and a device that generates gas is fixed in a position behind the installation opening in the vehicle compartment. The ventilation structure is installed at the installation opening; the ventilation structure includes a cover plate and a blocking member; wherein, the cover plate has a cover plate vent, and the blocking member is provided at a side of the body of the cover plate facing the car body Side, the lower part of the blocking member and the cover plate are sealed and fixed under the cover plate vent hole, the side of the blocking member and the cover plate are sealed outside the side end of the cover plate vent hole Fixed; the barrier body between the lower part and the side of the barrier is used to receive the liquid that enters from the vent hole of the cover plate, blocking the liquid from entering the side of the barrier body away from the cover plate , Thereby blocking liquid from entering the body of the car.

Compared with the background art, the ventilation structure of the rail train of the embodiment of the present application adds a blocking member, and the blocking member blocks the liquid entering from the vent hole of the cover plate from entering the side of the blocking member away from the cover plate, and further The liquid is blocked from entering the body of the car, and the damage to the equipment in the train from the liquid entering the ventilation structure is avoided.

When the liquid entering from the vent hole of the cover plate increases, if the height of the liquid reaches the position of the vent hole of the cover plate, the vent hole of the cover plate can also play a role of discharging part of the liquid.

During the implementation, the waterproof level of the barrier reaches the international industrial waterproof rating standard IPX5.

In the implementation, as shown in FIG. 5, a waterproof seal 120 is provided on the inner edge of the cover plate, and the waterproof level of the waterproof seal reaches the international industrial waterproof rating standard IPX5.

In implementation, as shown in FIG. 5, the barrier body 210 is recessed away from the cover plate 100 to form an accommodation gap between the barrier body 210 and the cover plate 100;

Wherein, the accommodating gap is used for accommodating the liquid entering from the cover plate vent 110.

The existence of the accommodating gap indicates that the barrier body and the cover plate are not in close contact, that is, the ventilation structure can accommodate a certain amount of liquid, so that it can also be applied when the external environment of the train installed in the ventilation structure has more liquid .

In order to discharge the liquid in the accommodating gap as soon as possible, during the implementation, as shown in FIG. 5, the cover plate further includes a liquid outlet 130, and the position of the liquid outlet 130 is lower than the cover plate vent hole 110 The lower part of the blocking member and the cover plate are sealed and fixed under the liquid outlet 130, so that the liquid entering the accommodation gap is discharged from the liquid outlet.

The position of the liquid outlet is lower than the position of the vent hole of the cover plate, so that the liquid containing the gap can be discharged from the liquid outlet in time.

In order to avoid liquid in the accommodation gap. In implementation, as shown in FIG. 5, the upper edge of the lower closed end 221 of the barrier is flatter or higher than the lower edge of the liquid outlet 130; wherein, the lower closed end 221 of the barrier is the barrier The lower part of the piece is used to seal and fix the part under the liquid outlet;

The barrier body 210 includes a plate-shaped portion 211 and a lower inclined portion 212 that slopes downward from the plate-shaped member 211 toward the lower closed end 221 of the barrier to avoid the accommodation gap There is liquid in the memory.

With the lower inclined portion and the liquid outlet of the above structure, the liquid in the accommodating gap is discharged in time, and no liquid is stored in the accommodating gap.

In order to discharge the gas generated by the equipment in the car body of the vehicle compartment, in implementation, the cover plate ventilation hole is located at the upper part of the cover plate;

7 is a partial enlarged view of FIG. 5, as shown in FIG. 7, the upper part of the blocking member has a blocking member ventilation hole 230, so that the gas generated by the equipment in the body of the vehicle compartment passes through the blocking member ventilation hole 230 And the vent hole 110 of the cover plate is discharged.

In this way, the gas generated by the equipment in the body of the car, especially the gas with a density lower than air, such as hydrogen, directly rises and is discharged through the barrier ventilation hole on the upper portion of the barrier and the cover panel ventilation hole. The track train in the embodiment of the present application is as follows:

The equipment in the body of the car generates hydrogen, and the lead-acid battery used as a low-voltage power supply in the body of the car will inevitably release hydrogen during use. Due to the needs of the train function, the lead-acid battery needs to be arranged in the car of the carriage, so the hydrogen in the rail train of the embodiment of the present application needs to be discharged in time.

In order to prevent the liquid entering from the vent holes of the cover plate from entering the body of the vehicle compartment through the vent holes of the blocking member. In implementation, as shown in FIG. 7, the position of the barrier vent 230 is higher than the position of the cover vent 110 to prevent liquid entering from the cover vent 110 from passing through the barrier vent 230 Into the body of the car.

In this way, it is avoided that the liquid entering from the vent hole of the cover plate enters the body of the car through the vent hole of the blocking member, causing damage to the equipment in the train.

In the implementation, as shown in FIG. 6, the upper end of the ventilation structure is also provided with a top vent 300 communicating with the accommodation gap, so that the gas generated by the equipment in the body of the car passes through the barrier The vent 230 and the top vent 300 are discharged.

The structure of the top vent can exhaust the gas generated by the equipment as much as possible, especially for the exhaust of less dense gas such as hydrogen.

In implementation, the blocking member ventilation holes are oblong holes arranged laterally;

Alternatively, there are a plurality of barrier ventilation holes, each of the barrier ventilation holes is arranged at equal intervals in the lateral direction, and the barrier ventilation holes are oblong holes.

In implementation, as shown in FIG. 4 and FIG. 5, the cover plate vent holes 110 are multiple and are inward-turning blinds; or may be outward-turning blinds.

In implementation, as shown in FIG. 4, there are a plurality of liquid outlets 130, and the positions of the liquid outlets are highly consistent, and the liquid outlets are oblong holes.

Example Three

In order to facilitate the installation and disassembly of the ventilation structure and the body of the car, one of the foldable hinges is fixed at the end of the ventilation structure, and the detachable type is fixed to the body of the car Another fold in the fold. 8 is a schematic diagram of a second foldable detachable hinge shown in FIG. 3 is fixed; FIG. 9 is a schematic diagram of a changed state of the second foldout shown in FIG. 8; FIG. 10 is an embodiment of the present application A schematic diagram of cooperation between the first fold and the second fold of a separable fold of a rail train.

The detachable fold includes a first fold and a second fold. As shown in FIG. 6, the first fold 410 includes a first sheet 411 and a shaft tube 412 fixed on the first sheet As shown in FIGS. 8 and 9, the second hinge 420 includes a second sheet 421, a shaft cylinder 422 fixed on the second sheet, and a retractable shaft 423 provided in the shaft cylinder;

As shown in FIG. 8, FIG. 9 and FIG. 10, the retractable shaft is retracted under the action of external force and reset after removing the external force, so that the shaft tube 412 can be sleeved on the outer circumferential surface of the retractable shaft 423, And the shaft tube 412 can be detached from the outer peripheral surface of the telescopic shaft 423. In the embodiment shown in FIG. 6, the end of the ventilation structure is fixed by screws to the first foldable foldable hinge; the body of the carriage is welded to fix the first foldable foldable hinge Two-fold page.

When the ventilation structure needs to be installed, an external force is applied to the retractable shaft, the retractable shaft is retracted, the shaft tube and the shaft cylinder can be aligned; after removing the external force, the retractable shaft is reset, and the shaft The tube is sleeved on the outer peripheral surface of the telescopic shaft to realize the installation of the ventilation structure and the car body of the car. In this way, the ventilation structure can only rotate around the telescopic axis, while the displacement in other directions is restricted.

When the ventilation structure needs to be disassembled, an external force is applied to the retractable shaft, and the retractable shaft is retracted so that the shaft tube is separated from the retractable shaft; after the external force is removed, the retractable shaft is reset to realize the ventilation structure from the compartment The car body was disassembled.

The presence of a detachable folding structure makes it possible to quickly remove the ventilation structure when it is necessary to dismantle the ventilation structure, such as to repair the ventilation structure or the equipment behind the ventilation structure, and also to quickly reinstall it in the car body on.

For ease of operation, in the implementation, as shown in Fig. 8, Fig. 9 and Fig. 10, a handle 424 is further provided on the side of the retractable shaft;

As shown in FIG. 8, FIG. 9 and FIG. 10, the side wall of the shaft barrel has a limit opening 425 that defines the movement path of the handle, the inner bottom surface of the shaft barrel is fixed with a spring 426, and the spring 426 will The handle 424 is pressed against the end of the limiting opening 425 away from the spring to expose the end of the retractable shaft away from the spring.

The structure of the handle and the limit opening makes the installation and disassembly of the ventilation structure and the car body of the carriage more convenient, and it can be realized without the help of special tools.

In order to make the installation and disassembly of the ventilation structure and the car body of the carriage more convenient, during implementation, as shown in FIG. 8, FIG. 9 and FIG. 10, the side wall of the axle barrel has the limit opening close to the axle barrel A groove 427 connected to one end of the bottom of the bottom is used for holding the handle 424 in the groove 427 when the retractable shaft is retracted under an external force to keep the retractable shaft 423 retracted Back state.

The existence of the slot structure makes the retractable shaft remain retracted when the handle is snapped into the slot. When the ventilation structure is installed on the body of the car, after aligning the axle barrel and the axle tube, the handle is detached from the slot, and the telescopic shaft is sleeved on the outer peripheral surface of the telescopic shaft. When the ventilation structure is detached from the body of the car, after removing the ventilation structure from the body of the car, the handle is detached from the slot.

In the implementation, in order to make the force of the ventilation structure more balanced, as shown in FIG. 6, the first hinge includes two opposed shaft tubes 412;

As shown in FIG. 8, FIG. 9 and FIG. 10, the second hinge includes two shaft 422 opposite to each other and two retractable shafts 423 opposite to each other, the retractable The direction of the shaft expansion and contraction is outward; one shaft tube 412 is used to sleeve with the outer peripheral surface of one retractable shaft 423.

In this way, after the installation of the ventilation structure and the car body of the car, the force is more balanced and it is not easy to damage.

After the ventilation structure and the body of the vehicle cabin are installed, in order to lock the ventilation structure, as shown in FIG. 4, the ventilation structure further includes a locking structure 500 for locking after the installation of the ventilation structure and the body of the vehicle cabin The relative position of the ventilation structure and the body of the car.

In the description of this application and its embodiments, it should be understood that the terms "top", "bottom", "height", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for It is convenient to describe the present application and simplify the description, rather than to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present application.

In this application and its embodiments, unless otherwise clearly specified and defined, the terms "setup", "installation", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be fixed The connection can also be a detachable connection or integrated; it can be a mechanical connection, an electrical connection, or a communication; it can be directly connected, or it can be indirectly connected through an intermediary, or it can be an internal connection between two components Or the interaction of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

In the present application and its embodiments, unless clearly defined and defined otherwise, the first feature "on" or "below" the second feature may include the first and second features in direct contact, or may include the first Not in direct contact with the second feature but through another feature between them. Moreover, the first feature is “above”, “above” and “above” the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature is "below", "below" and "below" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is less horizontal than the second feature.

The above disclosure provides many different implementations or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit this application. In addition, the present application may repeat reference numerals and/or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and/or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and/or the use of other materials.

Although some optional embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic inventive concept. Therefore, the appended claims are intended to be construed as including optional embodiments and all changes and modifications falling within the scope of the present application.

Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

A rail train is characterized by comprising:

A carriage, an installation opening is provided on the side of the carriage, and a gas generating device is fixed in a position behind the installation opening in the carriage;

A ventilation structure is installed at the installation port; the ventilation structure includes a cover plate and a blocking member, the cover plate has a cover plate ventilation hole, the blocking member is disposed on the cover plate facing the body of the vehicle body On one side, the lower part of the blocking member and the cover plate are sealed and fixed under the cover plate vent hole, and the side portion of the blocking member and the cover plate are outside the side end of the cover plate vent hole Sealed and fixed;

Wherein, the barrier body between the lower part and the side of the barrier is used to receive the liquid entering from the vent hole of the cover plate and block the liquid from entering the side of the barrier body away from the cover plate , Thereby blocking the liquid from entering the body of the car.
The rail train according to claim 1, wherein the barrier body is recessed away from the cover plate so that an accommodation gap is formed between the barrier body and the cover plate;

Wherein, the accommodating gap is used for accommodating the liquid entering from the vent hole of the cover plate.
The rail train according to claim 2, wherein the cover plate further includes a liquid outlet, the position of the liquid outlet is lower than the position of the cover plate vent hole, and the lower portion of the blocking member is The cover plate is sealed and fixed below the liquid outlet so that the liquid entering the accommodation gap is discharged from the liquid outlet.
The rail train according to claim 3, wherein the upper edge of the lower closed end of the blocking member is flatter or higher than the lower edge of the liquid outlet; wherein the lower closed end of the blocking member is the The lower part of the blocking member is used to seal the part fixed under the liquid outlet;

The barrier body includes a plate-shaped portion and a lower inclined portion, and the lower inclined portion is inclined downward from the plate-shaped member toward the lower closed end of the barrier to avoid liquid in the accommodating gap.
The rail train according to any one of claims 1 to 4, wherein the cover plate ventilation hole is located at an upper portion of the cover plate;

The upper part of the blocking member has a blocking member ventilation hole, so that the gas generated by the equipment in the vehicle body of the vehicle compartment is discharged through the blocking member ventilation hole and the cover plate ventilation hole.
The rail train according to claim 5, wherein the position of the barrier ventilation hole is higher than the position of the cover plate ventilation hole to prevent liquid entering from the cover plate ventilation hole from being ventilated through the barrier The hole enters the body of the compartment.
The rail train according to claim 6, wherein the upper end of the ventilation structure is further provided with a top vent communicating with the accommodation gap, so that the gas generated by the equipment in the body of the car passes through The barrier vent and the top vent are discharged.
The rail train according to claim 6, wherein the barrier vent is an oblong hole provided laterally;

Alternatively, there are a plurality of barrier ventilation holes, each of the barrier ventilation holes is arranged at equal intervals in the lateral direction, and the barrier ventilation holes are oblong holes.
The rail train according to any one of claims 1 to 4, wherein the cover plate has a plurality of vent holes, and is a louver or a louver.
The rail train according to claim 3, wherein there are a plurality of liquid outlets, and the positions of the liquid outlets are highly consistent.
The rail train according to claim 10, wherein the liquid outlet is an oblong hole.
The rail train according to any one of claims 1 to 4, characterized in that one of the detachable hinges is fixed to the end of the ventilation structure, and the body of the carriage is fixed with the Another fold in the detachable fold;

The detachable fold includes a first fold and a second fold, the first fold includes a first sheet and a shaft tube fixed on the first sheet; the second fold includes a A two-page sheet, a shaft cylinder fixed on the second page sheet and a retractable shaft provided in the shaft cylinder;

The retractable shaft is retracted under external force and reset after removing the external force, so that the shaft tube can be sleeved on the outer circumferential surface of the retractable shaft, and the shaft tube can be removed from the retractable shaft The outer peripheral surface is detached.
The rail train according to claim 12, wherein the side of the retractable shaft is further provided with a handle;

The side wall of the shaft barrel has a limit opening that defines the movement path of the handle, the inner bottom surface of the shaft barrel is fixed with a spring, and the spring presses the handle on the limit opening away from the spring To expose the end of the retractable shaft away from the spring.
The rail train according to claim 13, wherein the side wall of the axle barrel has a clamping slot communicating with one end of the limit opening near the bottom of the axle barrel, and the clamping slot is used for the When the telescopic shaft is retracted under the action of an external force, the handle is snapped into the clamping groove to maintain the retracted state of the telescopic shaft.
The rail train according to claim 14, wherein the first hinge includes two opposed shaft tubes;

The second hinge includes two shaft cylinders opposite to each other and two retractable shafts opposite to each other, and the direction of expansion and contraction of the retractable shaft is outward; one shaft tube is used to The outer peripheral surface of one of the telescopic shafts is sleeved.
The rail train according to any one of claims 1 to 4, wherein the ventilation structure further includes a locking structure that locks the ventilation structure and all the structures when the ventilation structure is installed on the body of the car Describe the relative position of the car body of the car.