Rotating shaft mechanism for installing side protection plate of through channel and through channel

Abstract

The utility model relates to a rotating shaft mechanism for installing a side protection plate of a through channel and the through channel. The rotating shaft mechanism comprises a supporting shaft and a mounting seat, the mounting seat is constructed to be an extruded profile and comprises an end wall fixing part, a main body part and a supporting shaft fixing part, and the main body part comprises a first branch extending from the end wall fixing part and a second branch arranged opposite to the first branch; the supporting shaft fixing part is formed on the side, close to the first branch, of the free end of the second branch and is configured to fix the supporting shaft in a relatively-rotating mode. The rotating shaft mechanism further comprises a rotating drum, and the rotating drum is pivotally connected to the supporting shaft and suitable for being connected with the side protection plate so as to drive the side protection plate. The rotating shaft mechanism of the side guard plate of the through passage of the B-type vehicle adopts an extruded profile structure, so that the portability of the mounting seat of the rotating shaft mechanism is greatly enhanced, possible welding defects are reduced, and the space of the whole rotating shaft mechanism is more compact.

Description

TECHNICAL FIELD

[0001] The utility model relates to the through passage technical field of rail train, especially a pivot mechanism for installing the side guard plate of the through passage between adjacent carriages and a through passage comprising the pivot mechanism. BACKGROUND

[0002] Vehicles such as rail passenger cars usually have two or more carriages. A through passage is usually provided between the bodies of two adjacent carriages to allow safe passage of personnel between the two carriages. The through passage usually includes a side interior trim to cover the frames and fasteners of the through passage, ensuring the safety of passengers and aesthetics.

[0003] Currently, the through passage side interior trim of rail transit B-type vehicles mainly adopts an integrated side guard plate structure or a non-integrated side guard plate structure, of which the integrated side guard plate structure is widely used and is the preferred choice for B-type vehicle through passages. During vehicle operation, the integrated side guard plate needs to be rotated by two pivot mechanisms to assist in work to meet various curves during vehicle operation. The pivot mechanism is installed on the vehicle body through a pivot mechanism mounting seat, so the pivot mechanism mounting seat is subjected to torque and tension from the pivot. Especially when the vehicle passes through complex road conditions such as small curve road conditions, the force on the mounting seat is complex, so the pivot mechanism mounting seat needs to have sufficient strength and a reasonable shape to meet the functional requirements.

[0004] The pivot mechanism mounting seat of the prior art rail transit B-type vehicle is mostly a steel welded part, which has a complex manufacturing process, possible welding defects, and an inconvenient structure design. Other existing pivot mechanism mounting seats also have problems such as large space occupation and heavy weight. Moreover, the existing pivot mechanism mounting seat has problems such as a complex connection structure with a lock box cover plate (also referred to as a cover plate assembly), a complex structure of the lock box cover plate, and complex installation. SUMMARY

[0005] The utility model aims to solve at least one of the above problems and / or other problems in the prior art.

[0006] To achieve the above object, according to one aspect of the present application, a pivot mechanism for installing a side guard plate of a through passage between adjacent carriages of a rail transit B-type vehicle is provided, the pivot mechanism comprises a support shaft and a mounting seat, the mounting seat is configured as an extruded profile and comprises an end wall fixing portion, a main body portion and a support shaft fixing portion. The end wall fixing portion is used for being fixed to an end wall of a carriage; the main body portion comprises a first branch extending from the end wall fixing portion and a second branch oppositely arranged with the first branch; the support shaft fixing portion is formed on a side of a free end of the second branch close to the first branch and is configured to non-rotatably fix the support shaft; wherein the pivot mechanism further comprises a rotating drum, the rotating drum is pivotably connected to the support shaft and is adapted to connect the side guard plate to drive the side guard plate.

[0007] In this scheme, for the side guard plate of the through passage of the rail transit B-type vehicle, it is driven to rotate relative to the support shaft by the rotating drum, and the support shaft is non-rotatably fixed to the pivot mechanism mounting seat. For the pivot mechanism with such structure, the mounting seat configured as an extruded profile can replace the traditional steel welded structure mounting seat, greatly enhancing the lightness of the pivot mechanism mounting seat. And reduces the possible welding defects, at the same time, the extruded profile saves the machining cost to some extent. And, in this scheme, the support shaft fixing portion is arranged on a side of a free end of the second branch of the mounting seat close to the first branch, that is, the support shaft fixing portion is located in the internal space between the first branch and the second branch of the main body portion of the mounting seat. Compared with the scheme in which the support shaft fixing portion is located on the outer side of the second branch (relative to the internal space between the first branch and the second branch), space is saved, and the entire pivot mechanism occupies less space.

[0008] According to an example of the present application, the support shaft fixing portion comprises oppositely arranged first and second sections and a connecting section arranged on one side of the first and second sections, and the other side of the first and second sections is locked by a locking member to fix the support shaft between the first and second sections.

[0009] According to an example of the present application, the pivot mechanism further comprises a cover plate assembly and a pull-out assembly, and the end wall fixing portion is further configured to install the cover plate assembly and the pull-out assembly.

[0010] According to an example of the present application, the end wall fixing portion comprises an inner side wall and an outer side wall, and a plurality of reinforcing rib plates arranged in space and connected between the inner side wall and the outer side wall, to form a plurality of cavities between the inner side wall and the outer side wall.

[0011] According to an example of the utility model, the plurality of reinforcing rib plates include a first rib plate farthest from a first branch of the main body part, and the mounting seat further includes a cover plate fixing part extending from the first rib plate in a direction away from the first branch.

[0012] According to an example of the utility model, the plurality of reinforcing rib plates include a second rib plate adjacent to the first rib plate, and the end wall fixing part is provided with a notch on a side facing the first rib plate to expose the second rib plate, so as to allow the pull-out assembly to be fixed to the exposed second rib plate.

[0013] According to an example of the utility model, the second rib plate is configured as an inclined surface, so that one end of the second rib plate connected with an outer side wall of the end wall fixing part is farther away from the first branch of the main body part than the other end connected with an inner side wall of the end wall fixing part.

[0014] According to an example of the utility model, the first section and the second section are respectively provided with half holes on the side walls opposite to each other, and the two half holes cooperatively form a through hole accommodating the support shaft.

[0015] According to an example of the utility model, a groove part capable of avoiding the main body part of the mounting seat is arranged in the rotating drum, and the rotating drum is provided with a connecting part for connecting the side guard plate at the part arranged in the main body part of the mounting seat.

[0016] According to an example of the utility model, the rotating shaft mechanism further includes a spring sleeved on the support shaft and connected between the support shaft and the rotating drum.

[0017] According to an example of the utility model, the pull-out assembly includes a fixed plate, a connecting rod mechanism arranged on the fixed plate, and a tension belt connected to the connecting rod mechanism, the connecting rod mechanism is connected to the second rib plate of the end wall fixing part via the fixed plate, and is connected to the rotating drum via the tension belt.

[0018] According to an example of the utility model, the cover plate assembly includes a cover plate body configured as an extruded profile and a cover plate lock seat pivotally connected to a first body part of the cover plate body via a rotating shaft, and the cover plate body is locked with the cover plate lock seat via a lock.

[0019] According to an example of the utility model, the cover plate assembly further includes a guard plate and a brush, a second body part of the cover plate body opposite to the first body part is bent towards the support shaft and is provided with a first groove and a second groove for mounting the guard plate and the brush respectively.

[0020] In the above scheme, the cover plate body is configured as an extrusion profile, the brush and the clamping groove of the guard plate (also known as a finger guard strip) are integrally extruded, thereby reducing the number of parts and installation work. Moreover, the cover plate lock seat is pivotally connected to the first body portion of the cover plate body via a rotating shaft. The cover plate lock seat serves as a connecting piece to connect the cover plate body to the mounting seat, and a pivot mechanism is formed between the cover plate body and the cover plate lock seat through the rotating shaft, so that a conventional hinge in the prior design is not needed, and thus the surface of the cover plate body can be subjected to overall spraying treatment (the surface of the hinge in the prior design cannot be subjected to spraying treatment), so that the color style of the vehicle interior is more matched.

[0021] According to another aspect of the present application, a through passage is provided, which is connected between two adjacent carriages of a rail transit B-type vehicle, and comprises two rotating shaft mechanisms and a side guard plate according to the above. The two rotating shaft mechanisms are fixed to the respective carriage end walls via the mounting seats; wherein one end of the side guard plate is connected to the rotating shaft mechanism of one of the carriages, and the other end of the side guard plate is connected to the rotating shaft mechanism of the other carriage. BRIEF DESCRIPTION OF DRAWINGS

[0022] The features and advantages of the present application will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings provided only by way of illustration, and thus, are not to be considered as limiting the present application, in which:

[0023] Figure 1 Fig. 4 shows a perspective view of the rotating shaft mechanism according to one exemplary embodiment of the present application, in a state where a side guard plate is installed.

[0024] Figure 2 Fig. 5 shows a perspective view of one rotating shaft mechanism according to one exemplary embodiment of the present application, from the top, to show the positional relationship of the mounting seat, the support shaft, the rotating cylinder, the cover plate assembly, and the pull-out assembly, etc. Figure 1

[0025] Fig. 6 shows a perspective view of the mounting seat of the rotating shaft mechanism shown in Figs. 1 to 5. Figure 3 Figure 1 2 Fig. 7 shows a perspective view of the mounting seat of the rotating shaft mechanism shown in Figs. 1 to 5.

[0026] Figure 4 Fig. 8 shows the rotating shaft mechanism partially, wherein the cover plate assembly and the mounting seat are mainly shown.

[0027] Figure 5 Fig. 9 shows the rotating shaft mechanism partially, wherein the pull-out assembly and the mounting seat are mainly shown.

[0028] Figure 6 Fig. 10 shows the rotating shaft mechanism partially, wherein the support shaft, the rotating cylinder, and the spring are mainly shown.

[0029] ​​Reference numerals:

[0030] 1, support shaft; 2, mounting seat; 21, end wall fixing part; 211, inner side wall; 212, outer side wall; 213, cavity; 214, first rib plate; 215, second rib plate; 216, notch; 22, main body part; 221, first branch; 222, second branch; 223, connecting part; 23, support shaft fixing part; 231, first section; 232, second section; 233, connecting section; 234, half hole; 24, cover plate fixing part; 3, cover plate assembly; 31, cover plate main body; 311, first groove; 312, second groove; 32, cover plate lock seat; 33, rotating shaft; 34, guard plate; 35, brush; 4, pull-out assembly; 41, fixing plate; 42, connecting rod mechanism; 43, tension belt; 5, locking piece; 6, rotating drum; 61, rotating drum main body; 62, rotating drum support; 63, groove; 64, connecting part; 7, spring; 8, lock; 9, side guard plate; 91, side guard plate main body; 92, clamping member. DETAILED DESCRIPTION

[0031] Embodiments of the present application are described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without some or all of these specific details. In other instances, well known process steps have not been described in detail in order not to unnecessarily obscure the present application. In addition, it is to be understood that the present application is not limited in its application to the particular details of construction and the arrangement of components set forth in the description and / or illustrated in the drawings. Rather, the application is capable of other embodiments and of being practiced or carried out in various ways.

[0032] In the description of the embodiments of the present application, the terms such as "first", "second", etc. are used to describe the elements of the present application, which are only used to distinguish the respective elements, and are not used to limit the nature, order or number of the elements. The terms "include" and "have" are used to mean an open-ended inclusion, and refer to the presence of additional elements / components in addition to the listed elements / components.

[0033] In the description of the embodiments of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application should be understood according to the specific circumstances.

[0034] Figure 1The side guard 9 shown can include a side guard body 91 and a clamping member 92. The clamping member 92 clamps the side guard body 91 on both sides of the side guard body 91. The clamping member 92 can be fixed on the rotating drum 6 of the rotating shaft mechanism by screws, and is pivotally connected to the support shaft 1 via the rotating drum 6. The support shaft 1 is fixed to the mounting seat 2 without relative rotation, and the mounting seat 2 is fixed to the end wall (not shown in the figure) of the carriage. When the rail train passes through the curve section, the rotating drum 6 and the side guard 9 carried thereby can rotate relative to the carriage, so as to adapt to the relative movement between adjacent vehicles of the train when passing through the curve section. In this process, the mounting seat 2 of the rotating shaft mechanism is subjected to torque and tension from the support shaft 1. Therefore, the mounting seat 2 needs to have sufficient strength and sufficient space to accommodate the end portion of the side guard 9.

[0035] Figure 1 It is also shown that the rotating shaft mechanism according to the embodiment of the utility model can include a support shaft 1, a mounting seat 2, a cover plate assembly 3, a pull-out assembly 4, a rotating drum 6 and a spring 7. As Figure 1 and Figure 2 shown, the support shaft 1 is fixed to the mounting seat 2 at positions close to the axial two ends thereof, so as to be fixed to the end wall of the carriage through the mounting seat 2. The cover plate assembly 3 is also connected to the two mounting seats 2, and its free end is close to the side guard body 91 to prevent passengers from approaching other parts of the rotating shaft mechanism. The pull-out assembly 4 is connected to the two mounting seats 2 and is arranged on one side of the cover plate assembly 3, for pulling out the end portion of the side guard 9 fixed on the rotating drum 6 after the cover plate assembly 3 is opened, so as to maintain or replace the side guard. The rotating shaft mechanism will be described in detail hereinafter.

[0036] Figure 3 The specific structure of the mounting seat 2 of the rotating shaft mechanism according to the embodiment is shown. As Figure 3 shown, the mounting seat 2 is configured as an integrally formed extruded profile, for example, an aluminum profile. Those skilled in the art can understand that the extruded profile here is a product shape and configuration defined by the name of a known method, and does not belong to the improvement of the method itself. In this scheme, for the rotating shaft mechanism of the side guard of the through passage of the rail transit B-type vehicle, the mounting seat adopted is configured as an extruded profile, which can use an aluminum profile instead of the traditional steel welded structure, greatly enhancing the lightness of the rotating shaft mechanism mounting seat. And reduces the possibility of welding defects, while the extruded profile saves machining costs to some extent.

[0037] In general, the mounting bracket 2 can include an end wall fixing portion 21, a main body portion 22, a support shaft fixing portion 23, and a cover fixing portion 24. The main body portion 22 can include a first branch 221, a second branch 222, and a connecting portion 223 connecting the first branch 221 and the second branch 222. The end wall fixing portion 21 can include an inner side wall 211, an outer side wall 212, and a plurality of reinforcing rib plates as shown in Figure 3 The inner side wall 211 and the outer side wall 212 are arranged opposite to each other, and the plurality of reinforcing rib plates are arranged spaced apart from each other and respectively extend between the inner side wall 211 and the outer side wall 212, thereby dividing the space between the inner side wall 211 and the outer side wall 212 into a plurality of cavities 213. These cavities 213 are arranged in a first direction L, in which an end of the end wall fixing portion 21 distal from the first branch 221 can be referred to as a terminal end, and the plurality of reinforcing rib plates can include a first rib plate 214 closer to the terminal end and a second rib plate 215 adjacent to the first rib plate 214. The end wall fixing portion 21 is provided with a notch 216 at the terminal end and on a side of the first rib plate 214, which penetrates from the inner side wall 211 to the outer side wall 212, thereby exposing the second rib plate 215 at the terminal end.

[0038] As shown in Figure 3 The second rib plate 215 can be configured as an inclined surface, the direction of which is arranged such that an end of the second rib plate 215 connected to the outer side wall 212 is further away from the first branch of the main body portion 22 than an end connected to the inner side wall 211. The second rib plate 215 is provided with a through hole, which can be used to mount a fixing plate of the pull-out assembly 4 (which will be described in detail below). The end wall fixing portion 21 is further provided with a plurality of through holes penetrating from the inner side wall 211 to the outer side wall 212, through which fasteners can be passed to fix the mounting bracket 2 to the end wall of the vehicle compartment.

[0039] Continuing to refer to Figure 3 The first branch 221 of the main body portion 22 extends substantially perpendicularly from an end of the end wall fixing portion 21 distal from the first rib plate 214. The second branch 222 is arranged spaced apart from and opposite to the first branch 221, and the length of the second branch 222 is less than the length of the first branch 221, thereby forming a gap between the free end of the second branch 222 and the end wall fixing portion 21 allowing the side guard 9 to enter the internal space of the mounting bracket 2.

[0040] In this embodiment, the support shaft fixing portion 23 is formed at the side of the free end of the second branch 222 close to the first branch 221, and is configured to fix the support shaft 1 in a non-rotatable manner. That is, the support shaft fixing portion 23 is located in the internal space between the first branch 221 and the second branch 222 of the main body portion of the mounting seat, and compared with the solution that the support shaft fixing portion 23 is located at the outer side of the second branch 222 (relative to the internal space between the first branch and the second branch), the space is saved, and the space occupied by the whole rotating shaft mechanism is smaller.

[0041] Specifically, the support shaft fixing portion 23 can include a first section 231, a second section 232 and a connecting section 233 arranged opposite to each other. The first section 231 and the second section 232 are arranged opposite to each other, and each has a first end and a second end in a second direction H transverse to the first direction L. The connecting section 233 connects the first ends of the first section 231 and the second section 232. The second ends of the first section 231 and the second section 232 are provided with a plurality of pairs of through holes, so that the first section 231 and the second section 232 are locked by the locking member 5 (for example, a bolt) passing through the corresponding pair of through holes, so as to generate the clamping force of the first section 231 and the second section 232 on the support shaft 1. In this way, the support shaft 1 can be clamped and fixed between the first section 231 and the second section 232, as shown in Figure 5 and Figure 6 In order to increase the friction surface between the first section 231 and the second section 232 and the support shaft 1 respectively, the first section 231 and the second section 232 are respectively provided with a half hole 234. The two half holes 234 are opposite to each other and cooperate to form a through hole for accommodating the support shaft 1. The connection between the first section 231 and the connecting section 233 is connected to the second branch 222, and the outer side of the first section 231 away from the first branch 221 is flush with the outer side of the second branch 222 in the second direction H, so that the support shaft fixing portion 23 can be integrally arranged in the internal space between the first branch 221 and the second branch 222.

[0042] Figure 4 The connection relationship between the cover plate assembly 3 and the mounting seat 2 according to the present embodiment is shown. As shown in Figure 3 The cover plate fixing portion 24 extends from the first rib plate 214 in a direction away from the first branch and is provided with a plurality of through holes for mounting the cover plate assembly 3. As shown in Figure 4 The cover plate assembly 3 can include a cover plate body 31, a cover plate lock seat 32, a rotating shaft 33, a guard plate 34 and a brush 35. The cover plate body 31 generally extends in the direction of the support shaft 1 and includes a first body portion in the form of a straight plate and a second body portion in the form of a bent plate, so that the cross section of the cover plate body 31 is generally in the shape of a "J" character.

[0043] One end of the first body portion of the cover plate body 31 is rotationally connected to the cover plate lock base 32 via the rotation shaft 33. The cover plate lock base 32 is provided with two and corresponds to the mounting seat 2 one by one, and is connected to the cover plate fixing portion 24 of the mounting seat 2 respectively. The cover plate lock base 32 can include a first portion and a second portion which are arranged at intervals. A lock plate is arranged on one of the first portion and the second portion, and the first portion and the second portion have a spacing for arranging the lock 8. The cover plate body 31 is locked to the cover plate lock base 32 via the lock 8 and the lock plate. The cover plate lock base 32 also has a connecting portion connecting the first portion and the second portion, which extends from the side of the first portion and the second portion away from the first body portion of the cover plate body 31 and is provided with a through hole for connecting the cover plate assembly to the cover plate fixing portion 24 of the mounting seat 2.

[0044] With reference to the drawings still Figure 4 As shown, when the cover plate body 31 is locked to the mounting seat 2, the free end of the second body portion of the cover plate body 31 is inclined towards the direction of the support shaft 1, and is provided with a first groove 311 and a second groove 312 side by side. The slot of the first groove 311 is used for mounting the guard plate 34. The slot of the second groove 312 is used for mounting the brush 35.

[0045] Figure 2 And Figure 5 The connection relationship between the pull-out assembly 4 and the mounting seat 2 according to the embodiment of the utility model is shown. As shown Figure 5 The pull-out assembly 4 can include a fixed plate 41, a connecting rod mechanism 42 and a tension belt 43. The fixed plate 41 is attached to and connected to the surface of the second rib plate 215 of the two mounting seats 2 respectively. The connecting rod mechanism 42 is arranged on the fixed plate 41. The tension belt 43 is composed of a soft material, one end of which is connected to the connecting rod mechanism 42 and the other end of which is fixed on the rotating drum 6 (or fixed on the rotating drum support 62 which will be described below). Thus, when the cover plate body 31 is opened, the rotating drum 6 can be pulled by operating the connecting rod mechanism 42 via the tension belt 43, thereby pulling the side guard plate 9, so that the connection part of the side guard plate 9 and the rotating drum 6 can be accessed to disentangle the side guard plate 9.

[0046] Figure 6 The connection relationship between the rotating drum 6, the spring 7 and the support shaft 1 according to the embodiment is shown. As shown Figure 6 The rotating drum 6 can include a rotating drum body 61 and a flower-shaped rotating drum support 62. The rotating drum body 61 is generally cylindrical, and is provided with a groove portion 63 corresponding to the position of each mounting seat 2, which avoids the body portion 22 of the mounting seat 2. The rotating drum body 61 is also provided with a connecting portion 64 for connecting the side guard plate 9 at the part of the rotating drum body 61 arranged in the body portion 22 of the mounting seat 2, as shown Figure 1Two or more drum supports 62 for connecting the drum body 61 can be provided. The drum supports 62 are arranged at intervals. The drum supports 62 are provided with through holes for the support shaft 1 to pass through, whereby the drum supports 62 can be arranged between the drum body 61 and the support shaft 1 to support the rotation of the drum body 61 relative to the support shaft 1.

[0047] With continued reference to Figure 1 and Figure 6 As shown, the spring 7 is sleeved on the support shaft 1 and can be arranged at a position on the support shaft 1 where no drum support 62 and mounting seat 2 are arranged. One end of the spring 7 is fixed to the support shaft 1 and the other end is fixed to the drum support 62. Thus, the side guard 9 can be kept in a taut state at all times under the action of the elastic force.

[0048] The utility model also provides a through passage connected between two adjacent carriages. The through passage can include two above-mentioned shaft mechanisms and a side guard 9. One shaft mechanism is fixed to the end wall of one of the carriages via its mounting seat 2 and the other shaft mechanism is fixed to the end wall of the other carriage via its mounting seat 2. The two ends of the side guard 9 are connected to the two shaft mechanisms respectively. The through passage thus has the advantages of the above-mentioned shaft mechanisms.

[0049] Various modifications and variations to the disclosed embodiments of the present utility model can be made without departing from the scope or spirit of the present utility model as would be apparent to those skilled in the art. Other embodiments of the present utility model, as would be apparent to those skilled in the art, are disclosed in accordance with the description set forth in this specification. The specification and examples given should be considered exemplary only, the true scope of the present utility model being indicated by the appended claims, along with the full range of equivalents to which such claims are entitled.

Claims

1. A rotating shaft mechanism for installing a side guard plate of a through passage, the through passage being arranged between adjacent carriages of a rail transit B-type vehicle, the rotating shaft mechanism comprising a support shaft (1) and a mounting seat (2), characterized in that, The mounting base (2) is configured to extrude a profile and comprises: an end wall fixing portion (21) for fixing to an end wall of a carriage; a main body portion (22) comprising a first branch (221) extending from the end wall fixing portion (21) and a second branch (222) disposed opposite to the first branch; and a support shaft fixing portion (23) formed on a side of a free end of the second branch close to the first branch and configured to non-rotatably fix the support shaft (1); wherein the rotating shaft mechanism further comprises a rotating drum (6) pivotally connected to the support shaft (1) and adapted to connect a side guard plate to drive the side guard plate.

2. The rotation shaft mechanism according to claim 1, wherein The support shaft fixing portion (23) comprises oppositely disposed first and second sections (231, 232) and a connecting section (233) disposed on one side of the first and second sections, and the other side of the first and second sections is locked by a locking member (5) to fix the support shaft (1) between the first and second sections.

3. A pivot mechanism according to claim 1 or 2, characterised in that The rotating shaft mechanism further comprises a cover plate assembly (3) and a pull-out assembly (4), and the end wall fixing portion (21) is further configured to mount the cover plate assembly (3) and the pull-out assembly (4).

4. The rotation shaft mechanism according to claim 3, wherein The end wall fixing portion (21) comprises inner and outer side walls (211, 212) and a plurality of reinforcing rib plates arranged in a spaced manner and connected between the inner and outer side walls, respectively, to form a plurality of profile cavities (213) between the inner and outer side walls.

5. The rotation shaft mechanism according to claim 4, wherein The plurality of reinforcing rib plates comprises a first rib plate (214) farthest from the first branch (221) of the main body portion, and the mounting base (2) further comprises a cover plate fixing portion (24) extending from the first rib plate (214) in a direction away from the first branch.

6. The rotation shaft mechanism according to claim 5, wherein The plurality of reinforcing rib plates comprises a second rib plate (215) adjacent to the first rib plate, and the end wall fixing portion (21) is provided with a notch (216) on a side facing the first rib plate (214) to expose the second rib plate (215) to allow the pull-out assembly (4) to be fixed to the exposed second rib plate (215).

7. The rotation axis mechanism according to claim 6, wherein The second rib plate (215) is configured as an inclined surface such that an end of the second rib plate (215) connected to the outer side wall (212) of the end wall fixing portion is farther from the first branch (221) of the main body portion than an end connected to the inner side wall (211) of the end wall fixing portion.

8. The rotation shaft mechanism according to claim 2, wherein The side walls of the first and second sections (231, 232) opposite to each other are respectively provided with half-holes (234), and the two half-holes cooperate with each other to form a through-hole accommodating the support shaft (1).

9. The revolute mechanism according to any one of claims 1-2 and 4-8, wherein, The rotating drum (6) is provided with a groove portion (63) capable of avoiding the main body portion (22) of the mounting base, and the rotating drum (6) is provided with a connecting portion (64) for connecting the side guard plate (9) at a portion thereof disposed in the main body portion (22) of the mounting base.

10. The rotation shaft mechanism according to claim 7, wherein The rotating shaft mechanism further comprises a spring (7) sleeved on the support shaft (1) and connected between the support shaft (1) and the rotating drum (6).

11. The rotation shaft mechanism according to claim 10, wherein The pulling-out assembly (4) comprises a fixed plate (41), a connecting rod mechanism (42) arranged on the fixed plate (41), and a pulling belt (43) connected to the connecting rod mechanism (42), the connecting rod mechanism being connected to the second rib plate (215) of the end wall fixed part via the fixed plate and connected to the rotating drum (6) via the pulling belt.

12. The rotation mechanism according to claim 3, wherein The cover plate assembly (3) comprises a cover plate body (31) configured as an extruded profile, and a cover plate lock seat (32) pivotally connected to a first body part of the cover plate body via a rotating shaft (33), the cover plate body being locked with the cover plate lock seat via a lock (8).

13. The rotation mechanism according to claim 12, wherein The cover plate assembly (3) further comprises a guard plate (34) and a brush (35), a second body part of the cover plate body (31) opposite to the first body part being bent towards the support shaft (1) and provided with a first groove (311) and a second groove (312) for mounting the guard plate and the brush respectively.

14. A through passage connecting between two adjacent cars of a rail transit B-type vehicle, characterized in that, The through passage comprises: two rotating shaft mechanisms according to any one of claims 1 to 13, the two rotating shaft mechanisms being fixed to corresponding carriage end walls via the mounting seat (2); and a side guard plate (9), one end of the side guard plate being connected to the rotating shaft mechanism of one of the carriages, and the other end of the side guard plate being connected to the rotating shaft mechanism of the other carriage.

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