An air duct mounting member for a railway vehicle

Abstract

The application discloses a kind of air duct installation components of rail vehicle, including top mounting bracket, two movable mounting plate, air duct and fastening mechanism, movable mounting plate is crossed by connecting pivot and can be relatively rotated, top slidingly embedded in top mounting bracket, air duct is provided with outer drift, movable mounting plate is provided with recess in corresponding position, outer drift is installed initially by being inserted into recess, hollow tube is provided on top mounting bracket, inner plug rotating column, rotating column is connected with lower movable mounting plate by fastening mechanism, air duct is pulled down, rotating column moves down and rotates in hollow tube, after being in position, fastening mechanism locks rotating column, completes air duct installation, outer drift is elastic metal material, and is integrally formed with air duct, size is greater than recess, forms centering effect, fastening mechanism includes mounting column, connecting piece, pressing sheet and elastic sheet, cooperates with spiral slide rail by using spiral groove, and elastic sheet and slot are set, ensure that air duct is stably installed and is convenient to disassemble.

Description

Technical Field

[0001] This invention relates to the field of air duct installation technology for rail transit, specifically to an air duct installation component for rail vehicles. Background Technology

[0002] Rail vehicles refer to a series of transportation vehicles that run on specific tracks, playing a crucial role in the transportation system. From traditional steam locomotives, diesel locomotives, and electric locomotives to modern high-speed trains, subway vehicles, light rail vehicles, and maglev trains, rail vehicles are diverse and each has its own characteristics. These vehicles not only possess the features of efficiency, speed, safety, and comfort, but also play an irreplaceable role in many fields such as urban public transportation, long-distance passenger transport, and freight transport. With the advancement of technology and the continuous improvement of people's travel demands, the design and manufacturing technology of rail vehicles is also constantly being updated and upgraded, developing towards greater intelligence, environmental friendliness, and human-centered design. In short, as an important component of the modern transportation system, rail vehicles will continue to provide more convenient and efficient services for people's travel and logistics transportation.

[0003] Ventilation ducts play a crucial role in the entire rail transit system, primarily responsible for the efficient transport and management of air. Through these ducts, fresh air is efficiently delivered into the passenger carriages, providing passengers with a comfortable riding environment; simultaneously, the ducts promptly expel stale air from the carriages, ensuring consistently excellent air quality. Furthermore, the duct design considers a balance between ventilation efficiency and noise control, as well as the need for rapid evacuation in emergencies, thereby guaranteeing the safe, comfortable, and efficient operation of the rail transit system.

[0004] A significant and easily overlooked problem in the existing installation of rail transit ventilation ducts is the complexity of the installation structure and the inconvenience of maintenance. Specifically, because the duct connections often use a large number of bolts for fastening, this design requires a significant amount of time for precise alignment and tightening operations in the initial stages of installation, demanding a high level of technical skill from the installation workers. Furthermore, when maintenance is required, the numerous bolt connections greatly increase the complexity and workload of the operation, hindering rapid response and efficient maintenance.

[0005] Therefore, we propose a ventilation duct installation component for rail vehicles. Summary of the Invention

[0006] The purpose of this invention is to provide a duct installation component for rail vehicles to overcome the aforementioned shortcomings in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: comprising a top mounting bracket, characterized in that the air duct mounting component of the rail vehicle further comprises:

[0008] Two movable mounting plates are connected by a cross-shaped pivot and can rotate relative to each other, with the tops of the two movable mounting plates slidingly fitted onto the top mounting frame;

[0009] The air duct is provided with an outward-protruding air duct. The two movable mounting plates are provided with grooves near the outward-protruding position. The initial installation of the air duct is achieved by snapping the outward-protruding air duct into the groove.

[0010] The air duct is installed by a hollow tube mounted on the top mounting frame via a top frame reinforcement plate and a rotating column inserted into the hollow tube. The rotating column is connected to the surface of the movable mounting plate below via a fastening mechanism. When the air duct is pulled down and the rotating column moves into place inside the hollow tube, the fastening mechanism locks the position of the rotating column to achieve the installation of the air duct.

[0011] As a further description of the above technical solution: the outer surface of the rotating column is provided with a spiral groove, and a spiral slide rail adapted to the spiral groove is provided on the inner wall surface of the hollow tube. When the rotating column moves downward inside the hollow tube, the rotating column generates a rotational action.

[0012] As a further description of the above technical solution: the fastening mechanism includes a mounting column, the bottom port of which is rotatably disposed on the surface of the movable mounting plate located below, and the top port of which is connected to the rotating column through a connector, and a pressure plate is also provided on the connector through a connecting piece, so that the pressure plate is driven to rotate through the connector when the rotating column rotates.

[0013] As a further description of the above technical solution: the fastening mechanism also includes a slot provided on the hollow tube, an elastic sheet is provided at the slot position, a spiral protrusion is provided on the inner side of the elastic sheet, and the pitch of the spiral protrusion is different from that of the spiral slide rail on the inner wall surface of the hollow tube.

[0014] As a further description of the above technical solution: the pressure plate is attached to the outer surface of the hollow tube, and when the elastic sheet is in the initial position, the distance between the open end of the elastic sheet and the surface of the hollow tube is greater than the thickness of the pressure plate.

[0015] As a further description of the above technical solution: the connector includes a first ring rotatably connected to the mounting column, and a second ring rotatably connected to the first ring. The second ring is fixedly connected to the bottom surface of the rotating column through a connecting rod. A first protrusion and a second protrusion are respectively provided on the surfaces of the first ring and the second ring that are close to each other. When the rotating column rotates and the second ring rotates through the connecting rod, the second protrusion abuts against the surface of the first protrusion after rotating one revolution. The connecting piece is fixedly provided on the outer periphery of the first ring.

[0016] As a further description of the above technical solution: the top mounting frame is provided with bolts, and the installation of the top mounting frame is achieved by screwing the bolts into the reserved screw holes on the top of the rail vehicle.

[0017] As a further description of the above technical solution: a spring assembly is also provided between the two sets of movable mounting plates. When the air duct is not installed on the movable mounting plate, the pressure plate abuts against the outer surface of the hollow tube through the elastic sheet, and the outer surface of the pressure plate is in contact with the surface of the elastic sheet.

[0018] As a further description of the above technical solution: the outer surface of the ring is prismatic.

[0019] As a further description of the above technical solution: the outer cantilever size is larger than the groove size, and the outer cantilever is made of elastic metal material and is integrally formed with the air duct. When the air duct and the movable mounting plate are not connected, the sum of the widths of the outer cantilever and the air duct is greater than the distance between the outer ports of the two grooves. However, the distance between the grooves plus the depth of the recess will be greater than the sum of the widths of the outer cantilever and the air duct. At this time, the outer cantilever on one side of the air duct is first inserted into the groove on one side to a certain depth, and then the outer cantilever on the other side is inserted into the groove to achieve the initial installation of the air duct.

[0020] In the above technical solution, the air duct installation component for rail vehicles provided by the present invention has the following beneficial effects:

[0021] 1. By designing a sliding engagement structure between the movable mounting plate and the top mounting bracket, and utilizing the duct's own weight or external tension for installation, the installation process is significantly simplified, eliminating the need for numerous bolts. This design not only reduces installation time and labor costs but also lowers the skill requirements for installers, thereby improving overall installation efficiency.

[0022] 2. Through the design of the fastening mechanism, including the cooperation of components such as the rotating column, spiral groove, spiral slide rail, elastic plate, and pressure plate, this invention ensures the stability of the air duct during installation. At the same time, this fastening method also makes disassembly more convenient; simply rotating the ring slightly is enough to release the lock, greatly improving the ease of maintenance.

[0023] 3. The outward-flaring section of the duct is made of flexible metal and integrally molded with the duct, with a size larger than the groove on the movable mounting plate. This design allows the duct to automatically align with the center during installation, creating a centering effect and improving installation accuracy and stability. Furthermore, due to the outward-flaring section's elasticity, it can adapt to ducts of different sizes and shapes, increasing installation flexibility and applicability. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0025] Figure 1 A schematic diagram of the overall structure from one angle provided for an embodiment of the present invention;

[0026] Figure 2 This is a structural schematic diagram of the whole from another angle provided for an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the fastening mechanism, hollow tube, and rotating column provided in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the fastening mechanism provided in an embodiment of the present invention;

[0029] Figure 5 This is a structural schematic diagram of the connector at one angle provided in an embodiment of the present invention;

[0030] Figure 6 This is a structural schematic diagram of the connector provided in an embodiment of the present invention from another angle;

[0031] Figure 7 Provided for embodiments of the present invention Figure 1 Enlarged structural diagram at point A in the middle.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Top mounting bracket; 2. Movable mounting plate; 3. Air duct; 4. Connecting shaft; 5. Hollow tube; 51. Rotating column; 52. Connecting rod; 6. Pressure plate; 61. Connecting plate; 62. Mounting column; 63. Elastic plate; 64. Groove; 65. Ring 1; 651. Protrusion 1; 652. Ring 2; 653. Protrusion 2; 7. Top frame reinforcing plate; 8. Spring assembly; 9. Outward projection; 10. Groove; 11. Spiral groove. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] Please see Figures 1-7This invention provides a technical solution including a top mounting frame 1 with bolts. The top mounting frame 1 is installed by screwing the bolts into the pre-drilled bolt holes on the top of the rail vehicle. The top mounting frame 1 acts as a keel-like structure and does not need to be disassembled. If the air duct 3 needs to be maintained or replaced, only the air duct 3 needs to be disassembled. When installing the air duct 3, the air duct 3 mounting component of the rail vehicle is also connected by two movable mounting plates 2 that are cross-connected by a connecting shaft 4 and can rotate relative to each other. The tops of the two movable mounting plates 2 are slidably fitted onto the top mounting frame 1. Thus, the two sets of movable mounting plates 2 cross each other and are connected at the intersection by the shaft to form a scissor fork structure. Since the two movable mounting plates 2 forming the scissor fork structure are slidably fitted onto the top mounting frame 1, they can only move in the horizontal direction.

[0036] The overall air duct 3 is configured with an outward-facing projection 9 on its outer side. Two movable mounting plates 2 have grooves 10 near the projection 9. The initial installation of the air duct 3 is achieved by engaging the projection 9 within the grooves 10. The projection 9 is larger than the groove 10 and is made of elastic metal, integrally formed with the air duct 3. When the air duct 3 is not connected to the movable mounting plates 2, the sum of the widths of the projection 9 and the air duct 3 is greater than the distance between the outer ends of the grooves 10 on both sides. However, the distance between the grooves 10 plus the depth of the recess will be greater than the sum of the widths of the projection 9 and the air duct 3. Therefore, the projection 9 on one side of the air duct 3 is first inserted into the groove on the other side. The duct 3 is initially installed by inserting the outer cantilever 9 on the other side into the groove 10 to a certain depth. After the initial installation is completed, the duct 3 is released. Under the action of gravity, the duct 3 sinks slightly, causing the two movable mounting plates 2, which form a scissor fork structure, to rotate relative to each other. The two ends of the bottom side of the two movable mounting plates 2 contract inward, allowing the outer cantilever 9 to be inserted deeper into the groove 10. Since the outer cantilever 9 is larger than the groove 10, when it is inserted into the groove 10, the inside of the groove 10 of the two movable mounting plates 2 abuts against the outer cantilever 9. The outer cantilever 9 moves the duct 3 towards the center, forming a centering effect. Compared with using bolts to directly install the duct 3 onto the rail vehicle, the installation is more convenient.

[0037] To enhance the stability of the air duct 3 during installation and prevent loosening, the air duct 3 mounting components of the rail vehicle also include a hollow tube 5 mounted on the top mounting frame 1 via a top frame reinforcing plate 7, and a rotating column 51 inserted into the hollow tube 5. The rotating column 51 is connected to the surface of the movable mounting plate 2 below via a fastening mechanism. Thus, when the air duct 3 is hung on the movable mounting frame via the outward flap 9 and the groove 10, and the air duct 3 is released to sink under gravity, the rotating column 51 moves downward within the hollow tube 5. Once the rotating column 51 has moved into position within the hollow tube 5, the fastening mechanism locks its position. At this point, the rotating column 51 has moved to the bottom of the hollow tube 5 and is positioned between the fastening mechanism and the bottom surface of the hollow tube 5, preventing further movement. This forms a scissor-fork structure. The two movable mounting plates 2 can no longer rotate relative to each other, and the ends of the movable mounting plates 2 that are slidably fitted on the top mounting bracket 1 also move to their maximum stroke. The scissor fork structure is locked, and due to the action of gravity or the manual downward pulling of the air duct 3, the outer float 9 will be completely inserted into the groove 10, and the elastic metal outer float 9 will deform and abut against the inner wall surface of the groove 10 and fit together. In this way, after the movable mounting plates 2 of the scissor fork structure are locked and fixed, the locked movable mounting plates 2 fix the air duct 3, realizing the tight installation of the air duct 3; and a spiral groove 11 is provided on the outer surface of the rotating column 51, and a spiral slide rail that is compatible with the spiral groove 11 is provided on the inner wall surface of the hollow tube 5. When the rotating column 51 moves downward in the hollow tube 5, the rotating column 51 will generate a rotation action in the hollow column;

[0038] In one embodiment of the present invention, the fastening mechanism includes a mounting post 62, the bottom port of which is rotatably disposed on the surface of the movable mounting plate 2 located below, and the top port of which is connected to the rotating post 51 via a connector, and a pressure plate 6 is provided on the connector via a connecting piece 61; the fastening mechanism also includes a slot 64 provided on the hollow tube 5, and an elastic piece 63 is provided at the slot 64 position, the inner side of which is provided with a spiral protrusion, and the pitch of the spiral protrusion is different from that of the spiral slide rail on the inner wall surface of the hollow tube 5, so that when pulled downward During the process of fixing the air duct 3 using the two movable mounting plates 2 of the scissor fork structure, the rotating column 51 rotates, driving the connecting plate 61 and the pressure plate 6 to rotate through the connector. When the pressure plate 6 rotates, since the pressure plate 6 is attached to the outer surface of the hollow tube 5, the pressure plate 6 rotates and abuts against the elastic plate 63, causing it to deflect inwards through the slot 64 into the hollow tube 5 until the pressure plate 6 is completely attached to the surface of the elastic plate 63. At this time, the elastic plate 63 is completely pressed into the slot 64. The inner side of the elastic plate 63 is provided with a spiral protrusion, and the pitch of the spiral protrusion is close to the inner wall surface of the hollow tube 5. The spiral guide rails on the hollow tube 5 are different, and the spiral guide rail on the inner wall surface of the hollow tube 5 is broken at the slot 64. The entire spiral guide rail is an incomplete thread type. At this time, the slot 64 at the broken position is filled by the elastic piece 63, which disrupts the continuity of the original spiral guide rail. At this time, the rotating column 51 just moves to the bottom of the hollow tube 5, and the elastic piece 63 is located at the top of the rotating column 51. At this time, the rotating column 51 is locked by the elastic piece 63 and the bottom of the hollow tube 5. At this time, the rotating column 51 can no longer move downward. And due to the setting of the upper elastic piece 63, when the rail vehicle encounters a slight... During bumpy conditions, the rotating column 51 cannot move upwards, and the air duct 3 is locked, achieving complete installation. Furthermore, since the multiple sets of elastic plates 63 are pressed into the groove 64 by the pressure plate 6, the elastic plates 63 have outward elasticity, which abuts against the inner surface of the pressure plate 6, forming friction. This friction further improves the installation effect of the air duct 3 and prevents loosening. After being pressed into the groove 64, the elastic plates 63 not only provide fixation for the rotating column 51, but also increase the friction between the elastic plates 6 and the pressure plate 6 through outward elasticity, giving the elastic plates 63 multiple positive effects.

[0039] For the installation of air duct 3, there is no need to use a large number of bolts for fastening. The installation of air duct 3 can be completed by its own weight or by adding some downward pulling force. It can also lock and secure air duct 3. The installation is convenient and the locking is also very simple. In this kind of installation method of air duct 3, such as for an entire train car, only the installation component needs to be installed at the head and tail of the car. After hanging the air duct 3, pull the air duct 3 downward. There is no need for multiple people to cooperate and first tighten some screws to initially fix the position of air duct 3. Instead, only multiple people need to cooperate to hang the air duct 3. This greatly simplifies the installation process of air duct 3 and prevents the problem of air duct 3 not being able to accurately align with the train screw holes due to inconsistent tightening of bolts.

[0040] In order to further improve the installation effect of the air duct 3 during installation, in another embodiment of the present invention, the connector includes a first ring 65 rotatably connected to the mounting column 62, and a second ring 652 rotatably connected to the first ring 65. The second ring 652 is fixedly connected to the bottom surface of the rotating column 51 through the connecting rod 52. A first protrusion 651 and a second protrusion 653 are respectively provided on the surfaces of the first ring 65 and the second ring 652 that are close to each other.

[0041] When the rotating column 51 rotates and the connecting rod 52 causes the second ring 652 to rotate, the second protrusion 653 will only come into contact with the surface of the first protrusion 651 after rotating one revolution. Thus, the second ring 652 rotates through the contacting protrusions 651 and 653. The connecting piece 61 is fixedly set on the outer periphery of the first ring 65. That is to say, in the initial stage when the air duct 3 is pulled down and the rotating column 51 is rotated, the first protrusion 651 and the second protrusion 653 do not contact each other, and the first ring 65 does not rotate at this time. Only when the rotating column 51 is about to move down to the bottom of the hollow tube 5 will the first protrusion 651 and the second protrusion 653 come into contact with each other, causing the first ring 65 to rotate. Thus, the connecting piece 61 causes the pressure plate 6 to rotate, so that the elastic piece 63 is pressed into the groove 64 to limit the rotation column 51 and realize the installation of the air duct 3.

[0042] It should be noted that when the air duct 3 is not installed, that is, when the elastic sheet 63 is in its initial state, the distance between the open end of the elastic sheet 63 and the surface of the hollow tube 5 is greater than the thickness of the pressure plate 6. Furthermore, a spring assembly 8 is provided between the movable mounting plates 2. When the air duct 3 is not installed on the movable mounting plate 2, the pressure plate 6 abuts against the outer surface of the hollow tube 5 through the elastic sheet 63, and the outer surface of the pressure plate 6 is in contact with the surface of the elastic sheet 63. This illustrates that when the air duct 3 is not installed, the spring assembly 8 provides support between the two movable mounting plates 2, preventing the movable mounting plates 2 from moving downwards too far under gravity, which could cause the rotating column 51 to be locked prematurely. At this time, the pressure plate 6 is positioned between the elastic sheet 63 and the hollow tube 5. At this time, the pressure plate 6 is pressed outward, and the elastic plate 63 generates an inward force to squeeze the pressure plate 6. The friction generated here can prevent the rotating column 51 from falling and rotating, and prevent the rotating column 51 from moving downward prematurely due to external forces when installing the top mounting bracket 1 and the two movable mounting plates 2. In addition, the spiral protrusions on the elastic plate 63 can further increase the friction between it and the pressure plate 6, further preventing the rotating column 51 from falling prematurely. The elastic plate 63 can clamp the pressure plate 6 when the air duct 3 is not installed, and further prevent the pressure plate 6 from moving downward through the spiral protrusions, preventing the movable mounting plate 2 from deforming when the air duct 3 is not installed. After the air duct 3 is installed, it can also be used as a structure to lock the air duct 3. It has multiple positive effects and is suitable for widespread use.

[0043] It should be noted that the elastic sheet 63 and the outer float 9 made of elastic metal can be any one or a combination of spring steel, spring copper, and spring titanium, all of which are elastic metals in the prior art, and will not be elaborated here.

[0044] When the air duct 3 needs to be disassembled for maintenance or replacement, the outer surface of the first ring 65 is prismatic. Using a tool, the first ring 65 is rotated in the same direction as the rotating column 51 when it moves downwards. At this time, the first protrusion 651 moves away from the second protrusion 653, and the pressure plate 6 gradually disengages from the elastic plate 63. The elastic plate 63 pops outwards, returning to its initial position. The locking of the elastic plate 63 to the rotating column 51 is released. The air duct 3 is then pushed upwards, causing the rotating column 51 to move upwards. The rotating column 51 then rotates in the opposite direction and moves upwards within the hollow tube 5. Simultaneously, the second protrusion 653 within the second ring 652 also rotates in the opposite direction until the rotating column 51 is about to reach the top of the hollow tube 5. 3 abuts against the surface of protrusion 651, and ring 65 rotates in the opposite direction. Since the elastic plate 63 is in its initial state at this time, the pressure plate 6 is inserted into the gap between the elastic plate 63 and the hollow tube 5, and the pressure plate 6 is clamped by the elastic plate 63, increasing the friction between the pressure plate 6 and the hollow tube 5 and the elastic plate 63. At this time, the rotating column 51 returns to its initial position, and the two ends of the bottom side of the two movable mounting plates 2 of the scissor fork structure open to both sides until the top end of the two movable mounting plates 2 slides and fits on the top mounting bracket 1 and moves to the maximum stroke. The two movable mounting plates 2 also return to their initial state. At this time, the air duct 3 can be removed. Similarly, first remove the outer flap 9 of one end from the groove 10, and then remove the outer flap 9 of the other end. At this time, the air duct 3 is disassembled.

[0045] Compared to the traditional method of installing the air duct 3 with bolts, disassembly is much simpler. Simply push the air duct 3 upwards to remove it. When using a tool to rotate the ring 65, only a short rotation is needed to disengage the pressure plate 6 from the elastic plate 63. This method is much easier to use. Furthermore, after pushing the air duct 3 upwards, it can be directly removed from the movable mounting plate 2. This solves the problem of the traditional bolt-installed method, which requires multiple workers or tools to lift the air duct 3 simultaneously to balance the force on its surface and prevent the bolts from becoming stuck, thus improving the overall usability.

[0046] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A mounting component for a ventilation duct (3) of a rail vehicle, comprising a top mounting bracket (1), characterized in that, The air duct (3) mounting components of the rail vehicle also include: Two movable mounting plates (2) are arranged crosswise and can rotate relative to each other by connecting shaft (4), and the tops of the two movable mounting plates (2) are slidably fitted onto the top mounting bracket (1); The air duct (3) is provided with an outward-flaring (9), and the two movable mounting plates (2) are provided with grooves (10) near the outward-flaring (9). By snapping the outward-flaring (9) into the grooves (10), the initial installation action of the air duct (3) is achieved. The hollow tube (5) is set on the top mounting bracket (1) by the top frame reinforcing plate (7) and the rotating column (51) is inserted into the hollow tube (5). The rotating column (51) is connected to the surface of the movable mounting plate (2) below by a fastening mechanism. When the air duct (3) is pulled down, the rotating column (51) moves down into place in the hollow tube (5). The fastening mechanism is used to lock the position of the rotating column (51) to realize the installation of the air duct (3). The outer surface of the rotating column (51) is provided with a spiral groove (11), and a spiral slide rail that is compatible with the spiral groove (11) is provided on the inner wall surface of the hollow tube (5). When the rotating column (51) moves downward inside the hollow tube (5), the rotating column (51) generates a rotation action. The fastening mechanism includes a mounting column (62), the bottom port of which is rotatably mounted on the surface of the movable mounting plate (2) located below, and the top port of the mounting column (62) is connected to the rotating column (51) via a connector, and a pressure plate (6) is provided on the connector via a connecting piece (61). When the rotating column (51) rotates, the pressure plate (6) is driven to rotate via the connector. The connector includes a first ring (65) rotatably connected to the mounting post (62), and a second ring (652) rotatably connected to the first ring (65). The second ring (652) is fixedly connected to the bottom surface of the rotating post (51) via a connecting rod (52). A first protrusion (651) and a second protrusion (653) are respectively provided on the surfaces of the first ring (65) and the second ring (652) that are close to each other. When the rotating post (51) rotates and the second ring (652) rotates via the connecting rod (52), the second protrusion (653) abuts against the surface of the first protrusion (651) after rotating one revolution. The connecting piece (61) is fixedly provided on the outer periphery of the first ring (65).

2. The air duct (3) installation component for a rail vehicle according to claim 1, characterized in that, The fastening mechanism also includes a slot (64) provided on the hollow tube (5), and an elastic piece (63) is provided at the slot (64). The inner side of the elastic piece (63) is provided with a spiral protrusion, and the pitch of the spiral protrusion is different from that of the spiral slide rail on the inner wall surface of the hollow tube (5).

3. The air duct (3) mounting component for a rail vehicle according to claim 1, characterized in that, The pressure plate (6) is attached to the outer surface of the hollow tube (5), and when the elastic sheet (63) is in the initial position, the distance between the open end of the elastic sheet (63) and the surface of the hollow tube (5) is greater than the thickness of the pressure plate (6).

4. The air duct (3) installation component for a rail vehicle according to claim 1, characterized in that, The top mounting bracket (1) is equipped with bolts. The installation of the top mounting bracket (1) is achieved by screwing the bolts into the reserved screw holes on the top of the rail vehicle.

5. The air duct (3) mounting component for a rail vehicle according to claim 4, characterized in that, A spring assembly (8) is also provided between the two sets of movable mounting plates (2). When the air duct (3) is not installed on the movable mounting plate (2), the pressure plate (6) abuts against the outer surface of the hollow tube (5) through the elastic sheet (63), and the outer surface of the pressure plate (6) is in contact with the surface of the elastic sheet (63).

6. The air duct (3) mounting component for a rail vehicle according to claim 5, characterized in that, The outer surface of the ring (65) is prismatic.

7. The air duct (3) installation component for a rail vehicle according to claim 1, characterized in that, The outer flap (9) is larger than the groove (10), and the outer flap (9) is made of elastic metal material and is integrally formed with the air duct (3). When the air duct (3) and the movable mounting plate (2) are not connected, the sum of the widths of the outer flap (9) and the air duct (3) is greater than the distance between the outer ports of the two side grooves (10).

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