Two-section folding coupler assembly and rail vehicle having same

Abstract

Disclosed in the present application are a two-section folding coupler assembly and a rail vehicle having same. The folding coupler assembly comprises: a folding transmission plate; a first joint and a second joint, which are separately hinged to the folding transmission plate; a locking slot, which is arranged on the first joint; and a locking plate, which is movably arranged on the second joint. When the folding transmission plate, the first joint and the second joint are in an extended state, by means of the relative motion of the locking plate, the locking plate is located in the locking slot or separates from the locking slot, thus realizing an extended and locked state or deflected and movable state of the folding transmission plate, the first joint and the second joint.

Description

Two-section folding coupler assembly and rail vehicle thereof

[0001] This application claims priority to the Chinese patent application filed with the Patent Office of China on September 12, 2023, with application number 202311170847.X and invention name “A two-section folding coupler assembly and its rail vehicle”; and the Chinese patent application filed with the Patent Office of China on September 12, 2023, with application number 202322469740.7 and invention name “A folding coupler assembly and its rail vehicle”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the field of rail vehicles, and specifically relates to a two-section folding coupler assembly and a rail vehicle thereof. Background Art

[0003] With the continuous development of rail transit equipment, research on train front-end couplers continues to deepen. Couplers are located at both ends of the train and must meet certain length requirements to facilitate rescue or reconnection operations. However, some train front-end spaces are relatively narrow. To meet these requirements, retractable or folding couplers are being adopted. Due to structural limitations, retractable couplers have limited extension and retraction dimensions, making them difficult to accommodate in smaller hidden spaces.

[0004] Currently, folding couplers are typically divided into two parts: a front and rear tie rod, connected by a pivot pin. The pivot pin's center of rotation is located on the axis of the coupler shaft. When the coupler folds at a large angle, interference occurs between the two sides of the folding joint, limiting the coupler's folding angle. Even after folding, the coupler still occupies a significant amount of space, making it difficult to conceal within the front-end opening and closing mechanisms of some vehicles.

[0005] For example, Chinese invention patent 201610778750.0 discloses a locking device for a folding coupler, a folding coupler and a locking method thereof; Chinese invention patent 201611247638.0 discloses a coupler assembly and a straddle-type rail train having the same. The folding mechanisms of the above patents will cause mechanical interference between the front and rear pull rods during the folding process.

[0006] Summary of the Invention

[0007] The present application provides a two-section folding coupler assembly and a rail vehicle thereof, wherein the coupler assembly can significantly reduce the space occupied by the coupler after folding.

[0008] The two-stage folding coupler assembly provided in the first aspect of the present application comprises:

[0009] Folding transmission plate;

[0010] The first joint and the second joint are respectively hingedly arranged on the folding transmission plate;

[0011] a locking groove, provided on the first joint;

[0012] a locking plate, movably disposed on the second joint;

[0013] The folding transmission plate, the first joint and the second joint can be in a collinear state, and through the relative movement of the locking plate, the locking plate can be located in or out of the locking groove to achieve a straight locking state or a deflected active state between the folding transmission plate, the first joint and the second joint.

[0014] In some embodiments, two rotation centers are formed between the folding transmission plate and the first joint and the second joint respectively.

[0015] In some embodiments, the two-stage folding coupler assembly includes a driving member that drives the locking plate, which is selected from one of a pneumatic cylinder, an electric push cylinder, and an electric screw machine; the fixed end of the driving member is installed on the second joint, and the movable end of the driving member is installed on the locking plate, so that the locking plate is pushed into the locking groove or retracted from the locking groove through the movable end.

[0016] In some embodiments, the two-section folding coupler assembly also includes: a first connecting plate, arranged on the second joint; a second connecting plate, arranged on the locking plate; and an elastic telescopic member, arranged between the first connecting plate and the second connecting plate, and used to pull the locking plate toward the locking groove.

[0017] In some embodiments, the elastic telescopic members are provided with two and are symmetrically arranged between two sets of first connecting plates and the second connecting plates respectively; the elastic telescopic members are tension springs.

[0018] In some embodiments, the two-section folding coupler assembly also includes a hinge groove and a guide groove, wherein the hinge grooves are respectively arranged at the adjacent ends of the first joint and the second joint, so that the two ends of the folding transmission plate are respectively embedded and hinged in the hinge grooves of the first joint and the second joint; the locking groove and the guide groove are respectively arranged at the same end surface of the adjacent ends of the first joint and the second joint; and a top plate is provided on the guide groove, so that the locking plate cooperates with the locking groove through a sliding channel formed between the top plate and the guide groove.

[0019] In some embodiments, the first connecting plate is located on the top plate near the first joint; the second connecting plate is located at an end of the locking plate that does not cooperate with the locking groove.

[0020] In some embodiments, the two-section folding coupler assembly further includes a pull rope, which is disposed on the locking plate and is used to pull the locking plate outward, thereby disengaging the locking plate from the locking groove by overcoming the tension of the elastic telescopic member.

[0021] In some embodiments, the two-section folding coupler assembly further includes: a pull ring, disposed at the outer end of the pull rope; a guide wheel, disposed at the path of the pull rope, allowing the pull rope to pass through the guide wheel; and a placement frame, disposed on one side of the guide wheel and used to place the pull ring, and can be snap-connected to the pull ring.

[0022] In some embodiments, the two-section folding coupler assembly also includes: a pin shaft, which is respectively provided at the hinge points of the folding transmission plate and the first joint and the hinge points of the folding transmission plate and the second joint, and the two hinge points do not overlap; a pin shaft slot, which is respectively opened on the locking groove and the guide groove; the upper end of the pin shaft is embedded in the pin shaft slot and can be abutted against the locking plate, and the lower end of the pin shaft passes through the outside of the folding transmission plate and the first joint / second joint, and is provided with a nut for limiting locking.

[0023] In some embodiments, the two ends of the folding transmission plate are arc-shaped; the first joint has a first arc-shaped end surface, in which a first hinge groove with an opening is formed, so that a first part and a second part opposite to the first part are formed on the first joint; a locking groove is formed on the first part; the second joint has a second arc-shaped end surface, in which a second hinge groove with an opening is formed, so that a third part and a fourth part opposite to the third part are formed on the second joint; a guide groove is formed on the third part; wherein the first arc-shaped end surface and the second arc-shaped end surface are arranged opposite to each other, and the opening of the first hinge groove and the opening of the second hinge groove are arranged opposite to each other to accommodate the folding transmission plate; the locking groove and the guide groove are arranged opposite to each other to accommodate the locking plate.

[0024] In some embodiments, a first through hole is provided in the first part and the second part of the first joint, and the first pin passes through the two first through holes and the folding transmission plate located between the first through holes, so that the first joint and the folding transmission plate are rotatably connected to each other; a second through hole is provided in the third part and the fourth part of the second joint, and the second pin passes through the two second through holes and the folding transmission plate located between the second through holes, so that the second joint and the folding transmission plate are rotatably connected to each other; the ends of the first pin and the second pin are fastened with nuts; further, a first pin slot is formed in the first part of the first joint, which is deeper than the locking slot; the head of the first pin is located in the first pin slot to form a part of the locking slot, which can abut against the locking plate; a second pin slot is formed in the third part of the second joint, which is deeper than the guide slot; the head of the second pin is located in the second pin slot to form a part of the guide slot, which abuts against the locking plate.

[0025] In some embodiments, the second joint has a top plate covering the top of the guide groove, and the top plate and the guide groove form a sliding channel for the locking plate to slide; relatively, the first connecting plate is arranged on the top plate close to the locking groove, and the second connecting plate is arranged on the locking plate away from the locking groove; the two ends of the elastic telescopic member are respectively arranged on the first connecting plate and the second connecting plate, and are in a stretched state; the height of the second connecting plate is greater than the height of the sliding channel, so that the second connecting plate can block the end of the sliding channel away from the locking groove.

[0026] In some embodiments, the two-section folding coupler assembly also includes a limit plate, which is arranged on either side of the folding transmission plate or the first joint or the second joint to limit the deflection direction of the first joint and the second joint; the deflection angle range between the first joint and the second joint is 0°-180°.

[0027] The rail vehicle provided in the second aspect of the present application includes a two-section folding coupler assembly as described in any one of the above embodiments; the two-section folding coupler assembly is installed between the coupling system and the buffer system of the rail vehicle.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] 1. The two-stage folding coupler assembly provided in at least one embodiment of the present application realizes a two-stage folding method by folding a transmission plate, and sets two corresponding rotation centers so that the rotation center of the rotating pin of the current folding coupler can be transferred to the outside of the coupler axis, thereby avoiding interference with the structures on both sides of the folding joint, increasing the folding angle of the coupler, and greatly reducing the space occupied by the coupler after folding.

[0030] 2. The two-stage folding coupler assembly provided in at least one embodiment of the present application adopts a two-stage hinged structure, thereby enabling a 0°-180° deflection of the first joint and the second joint, truly realizing complete folding and retraction, avoiding the problem of mechanical interference in traditional structural methods, maximizing the folding angle of the coupler, reducing the space occupied by the coupler after folding, and ensuring that the coupler can be hidden in the opening and closing mechanism at the vehicle end.

[0031] 3. The two-stage folding coupler assembly provided in at least one embodiment of the present application optimizes the overall locking structure, realizes the self-locking function of the locking groove and the locking plate through the pulling force of the elastic telescopic part, and realizes the unlocking function by pulling the pull rope, and the operation is simple and reliable.

[0032] 4. The two-stage folding coupler assembly provided in at least one embodiment of the present application optimizes the hinged structure setting of the folding transmission plate, the first joint, and the second joint, as well as the setting position of the locking plate and the guide groove, thereby greatly improving the reliability of the connection structure and the convenience of installation, disassembly and maintenance.

[0033] 5. The two-stage folding coupler assembly provided in at least one embodiment of the present application is equipped with corresponding guide wheels, pull rings and placement frames to limit the position of the pull rope, thereby improving the safety and stability of the structure, and corresponding limiting plates are added to limit the deflection direction of the first joint and the second joint to play a guiding and limiting role. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1 is a schematic diagram of the three-dimensional structure of a coupler assembly according to an embodiment;

[0035] FIG2 is a schematic diagram of a three-dimensional structure of a coupler assembly including a limit plate according to an embodiment;

[0036] FIG3 is a schematic cross-sectional view of a coupler assembly according to an embodiment;

[0037] FIG4 is a top view of the first joint and the second joint after being fully folded;

[0038] FIG5 is a perspective view of the first joint and the second joint in the process of angle adjustment;

[0039] FIG6 is a perspective schematic diagram of the second joint;

[0040] FIG7 is a perspective schematic diagram of the first joint;

[0041] Description of the drawings: 1 first joint, 101 first arcuate end surface, 102 first part, 103 second part, 2 second joint, 201 second arcuate end surface, 202 third part, 203 fourth part, 3 folding transmission plate, 4 locking groove, 5 locking plate, 6 guide groove, 7 top plate, 8 first connecting plate, 9 second connecting plate, 10 elastic telescopic part, 11 pull rope, 12 guide wheel, 13 pull ring, 14 placement rack, 15 limit plate, 16 hinge groove, 17 pin shaft, 18 pin shaft slot, 19 sliding channel, 20 rod body. DETAILED DESCRIPTION

[0042] The technical solution of the present application is described in detail below in conjunction with specific embodiments. However, it should be understood that without further description, the elements, structures and features in one embodiment may also be beneficially combined with other embodiments.

[0043] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features.

[0044] In the description of this application, it should be understood that the terms "upper", "lower", "bottom", "inner", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in FIG1 , and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; they can refer to direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0046] As shown in Figures 1-5, the first embodiment of the present application provides a two-stage folding coupler assembly (hereinafter referred to as the coupler assembly), comprising: a folding front joint 1 (i.e., the first joint), a folding rear joint 2 (the second joint), and a folding transmission plate 3; wherein, the first joint 1 and the second joint 2 are respectively hingedly arranged on the folding transmission plate 3 (i.e., the two can rotate relative to the folding transmission plate 3), and the deflection angle between the two ranges from 0° to 180°. The locking groove 4 is provided on the first joint 1; the locking plate 5 is movably provided on the second joint 2. The first joint 1, the folding transmission plate 3, and the second joint 2 can be in a collinear state, and the locking plate 5 can be located in or out of the locking groove 4 through the relative movement of the locking plate 5, so as to realize a straightened locked state or a deflected movable state between the folding transmission plate 3, the first joint 1, and the second joint 2.

[0047] When the coupler needs to be extended and opened, the folding transmission plate 3 or the first joint 1 is rotated so that the first joint 1, folding transmission plate 3, and second joint 2 are in a straight configuration. The locking plate 5 is then moved into the locking slot 4 to lock the first joint 1, folding transmission plate 3, and second joint 2 in extension. When the coupler needs to be folded and retracted, the locking plate 5 is removed from the locking slot 4, allowing the folding transmission plate 3 and first joint 1 to deflect, thereby achieving deflection of the first joint 1, folding transmission plate 3, and second joint 2, as shown in Figures 4 and 5.

[0048] In the above process, due to the addition of the folding transmission plate 3, two rotation centers are formed between the folding transmission plate 3 and the first joint 1 and the second joint 2 respectively, thereby avoiding the mechanical interference problem between the first joint 1 and the second joint 2, thereby maximizing the folding angle of the coupler and reducing the space occupied after the coupler is retracted.

[0049] The locking plate 5 can be driven by a driver; in some embodiments, as shown in Figures 1-3, the locking plate 5 can be driven by an elastic member 10 to achieve a self-locking function. Specifically, the coupler assembly further includes: a first connecting plate 8, a second connecting plate 9, and an elastic member 10 (serving as a driver); the first connecting plate 8 is disposed on the second joint 2; the second connecting plate 9 is disposed on the locking plate 5; and the elastic member 10 is disposed between the first connecting plate 8 and the second connecting plate 9 and is used to pull the locking plate 5 toward the locking groove 4.

[0050] Without being affected by external forces, the elastic member 10 always applies a force to the locking plate 5 to pull the locking plate 5 into the locking groove 4, thereby ensuring the connection stability of the first joint 1 and the second joint 2 in the straightened and locked state.

[0051] Preferably, two elastic telescopic members 10 are provided and symmetrically arranged between the two sets of first connecting plates 8 and second connecting plates 9 respectively; the elastic telescopic members 10 are tension springs. According to actual needs, more or fewer elastic telescopic members 10 can be provided. The driving member can also be an elastic pull rope or other elastic structure. Similarly, the driving member of the above-mentioned locking plate 5 is not limited to the elastic telescopic member 10, and can also be other mechanisms that can realize the relative movement of the locking plate 5, such as a cylinder, an electric push cylinder, an electric screw machine, etc. The fixed ends of these driving members are installed on the second joint 2, and the movable ends thereof are installed on the locking plate 5, so that the locking plate 5 is pushed into the locking groove 4 or retracted from the locking groove 4 through the movable end.

[0052] In some embodiments, as shown in Figures 5-7, the coupler assembly further includes: a hinge groove 16 and a guide groove 6; the hinge groove 16 is respectively provided at the adjacent ends of the first joint 1 and the second joint 2, so that the two ends of the folding transmission plate 3 are respectively embedded and hinged in the hinge groove 16 of the first joint 1 and the second joint 2; the locking groove 4 and the guide groove 6 are respectively provided at the same end surface of the adjacent ends of the first joint 1 and the second joint 2, and a top plate 7 is provided on the guide groove 6, so that the locking plate 5 cooperates with the locking groove 4 through a sliding channel 19 formed between the top plate 7 and the guide groove 6.

[0053] This embodiment further optimizes the structural arrangement between the folding transmission plate 3, the first joint 1, and the second joint 2. The adjacent ends of the first joint 1 and the second joint 2 are both arc-shaped end faces, and the two end faces of the folding transmission plate 3 are also preferably arc-shaped end faces, so that the structure is more compact and avoids mutual interference in movement. The embedded hinged structure is adopted to further ensure the rigidity and stability of the structure at the hinge. The setting positions of the locking groove 4 and the guide groove 6 are optimized and adjusted, and the top plate 7 is matched so that the locking plate 5 is embedded in the movable channel formed between the top plate 7 and the guide groove 6, which not only improves the movement guidance but also ensures that it will not fall off. At the same time, the coordination of the above structure also facilitates the installation, assembly and maintenance of the equipment structure, thereby improving the work efficiency of maintenance personnel.

[0054] In some embodiments, the first connecting plate 8 is located on the top plate 7 near the first joint 1; the second connecting plate 9 is located on the end of the locking plate 5 that does not engage with the locking groove 4. The above-mentioned positional structural relationship facilitates the installation of the tension spring while ensuring that it has sufficient space to bear the force.

[0055] In some embodiments, as shown in FIG2 , the coupler assembly further includes: a pull rope 11, which is provided on the locking plate 5 and is used to pull the locking plate 5 outward (in a direction away from the locking groove 4), thereby overcoming the tension of the elastic telescopic member 10 so that the locking plate 5 is disengaged from the locking groove 4. The pull rope 11 serves as a motion force-bearing mechanism for pulling the locking plate 5, so that the operator can perform the pulling operation, thereby reducing the overall production cost and eliminating the need for a complex mechanical drive unit. When the driving member is a pneumatic cylinder, an electric push cylinder, and an electric screw machine, since the locking plate 5 can be pushed forward or pulled back by the movement of these driving members, there is no need to configure an additional pull rope.

[0056] The coupler assembly further includes a pull ring 13, a guide wheel 12, and a placement rack 14. The pull ring 13 is located at the outer end of the pull rope 11. The guide wheel 12 is located in the path of the pull rope 11, allowing the pull rope 11 to pass through the guide wheel 12. The placement rack 14 is located on one side of the guide wheel 12 and is used to place the pull ring 13 and can be snap-connected to the pull ring 13. The guide wheel 12 serves as a movement guide, and the pull ring 13 facilitates the operator to pull the pull rope 11. When the pull ring 13 is not in use, it can be placed on the placement rack 14.

[0057] In some embodiments, as shown in Figures 3, 6, and 7, the coupler assembly further includes: a pin 17 and a pin slot 18. The pin 17 is respectively provided at the hinge point between the folding transmission plate 3 and the first joint 1 and the hinge point between the folding transmission plate 3 and the second joint 2, and the two hinge points do not overlap; the pin slot 18 is respectively provided on the locking groove 4 and the guide groove 6; the upper end of the pin 17 is embedded in the pin slot 18 and can abut against the locking plate 5, and the lower end of the pin 17 passes through the outside of the folding transmission plate 3 and the first joint 1 / second joint 2, and is provided with a nut for limiting locking, as shown in Figure 3.

[0058] More specifically, as shown in Figure 7 , the first joint 1 has a first curved end surface 101, in which a first hinge groove 1601 with an opening is formed, thereby forming a first portion 102 and a second portion 103 opposite the first portion on the first joint 1; a locking groove 4 is formed in the first portion 102. As shown in Figure 6 , the second joint 2 has a second curved end surface 201, in which a second hinge groove 1602 with an opening is formed, thereby forming a third portion 202 and a fourth portion 203 opposite the third portion on the second joint 2; a guide groove 6 is formed in the third portion 202. As shown in Figure 1 , the first curved end surface 101 and the second curved end surface 201 are disposed opposite each other, and the openings of the first hinge groove 1601 and the second hinge groove 1602 are disposed opposite each other to accommodate the folding transmission plate 3; the locking groove 4 and the guide groove 6 are disposed opposite each other to accommodate the locking plate 5.

[0059] Furthermore, as shown in Figures 3, 6, and 7, first joint 1 has first through-holes defined in both its first portion 102 and second portion 103. A first pin 1701 extends through the two first through-holes and the folding transmission plate 3 positioned between the first through-holes, thereby rotatably connecting the first joint 1 and the folding transmission plate 3. Second joint 2 has second through-holes defined in both its third portion 202 and fourth portion 203. A second pin 1702 extends through the two second through-holes and the folding transmission plate 3 positioned between the second through-holes, thereby rotatably connecting the second joint 2 and the folding transmission plate 3. The end of the pin 17 can be secured with a nut.

[0060] As shown in FIG7 , a first pin slot 1801 is formed in the first portion 102 of the first joint 1 and is deeper than the locking slot 4. The head of the first pin 1701 is located in the first pin slot 1801, forming a portion of the locking slot 4 and capable of abutting the locking plate 5. As shown in FIG6 , a second pin slot 1802 is formed in the third portion 202 of the second joint 2 and is deeper than the guide slot 6. The head of the second pin 1702 is located in the second pin slot 1802, forming a portion of the guide slot 6 and abutting the locking plate 5.

[0061] As shown in Figures 1 and 2, the second joint 2 also has a top plate 7 covering the top of the guide slot 6. This top plate 7 and the guide slot 6 form a sliding channel 19 for the locking plate 5 to slide, thereby preventing the locking plate 5 from leaving the guide slot 6 and jumping out. More specifically, the first connecting plate 8 is relatively positioned on the top plate 7 near the locking slot 4, and the second connecting plate 9 is relatively positioned on the locking plate 5 away from the locking slot 4. The ends of the elastic member 10 are respectively positioned on the first connecting plate 8 and the second connecting plate 9, and are in a stretched state. The height of the second connecting plate 9 is greater than the height of the sliding channel 19, so that the second connecting plate 9 can block the end of the sliding channel 19 away from the locking slot 4.

[0062] The above-mentioned structural mode, combined with the structural setting mode between the aforementioned folding transmission plate 3, the first joint 1, and the second joint 2, can provide the convenience and reliability of installation between the various components to the greatest extent, making the overall structure of the equipment easier to install and maintain.

[0063] In some embodiments, the coupler assembly further includes a limit plate 15, which is disposed on either side of the folding transmission plate 3 or the first joint 1 or the second joint 2 to limit the deflection direction of the first joint 1 and the second joint 2. Preferably, the limit plate 15 is mounted on the folding transmission plate 3, extending from the first joint 1 to the second joint 2, as specifically shown in Figures 4 and 5 . This limits the deflection direction of the first joint 1 and the second joint 2 to only one side, facilitating operator control, while also serving as an auxiliary positioning function in the straightened and locked state.

[0064] A second embodiment of the present application provides a rail vehicle comprising a two-stage folding coupler assembly as described in any of the preceding embodiments. The coupler assembly is installed between a coupling system and a buffer system (not shown) of the rail vehicle. In one embodiment, a first joint 1 is connected to the buffer system, and a second joint 2 is connected to the coupling system via a rod 20, as shown in Figure 1.

[0065] Its working principle is:

[0066] Due to the installation restrictions of the limit plate 15, when the first joint 1 and the second joint 2 are connected and locked, the first joint 1 and the second joint 2 can only deflect to one side. When the first joint 1 and the second joint 2 are deflected to the extreme position, the first joint 1, the folding transmission plate 3, and the second joint 2 are now in a straight state. The pull rope 11 is slowly released through the pull ring 13. Under the force of the tension spring, the locking plate 5 extends from the sliding channel 19 formed between the top plate 7 and the guide groove 6 until the locking plate 5 is located in the locking groove 4, completing the straightening and locking of the first joint 1, the folding transmission plate 3, and the second joint 2. When unlocking is required, the locking plate 5 is pulled outward through the pull ring 13 to complete the deflection movement between the first joint 1, the folding transmission plate 3, and the second joint 2.

[0067] The described embodiments are merely descriptions of the preferred embodiments of the present application and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements made to the technical solutions of the present application by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present application.

Claims

1. A two-stage folding coupler assembly, wherein: include: Folding transmission plate; A first joint and a second joint are respectively hingedly arranged on the folding transmission plate; A locking groove, provided on the first joint; A locking plate, movably disposed on the second joint; Wherein, the folding transmission plate, the first joint and the second joint can be in a co-linear state; Through the relative movement of the locking plate, the locking plate is positioned in or out of the locking groove, so as to realize the straightening locking state or the deflecting active state between the folding transmission plate, the first joint and the second joint.

2. The two-section folding hook assembly according to claim 1, wherein: The coupler assembly also includes: a first connecting plate, arranged on the second joint; a second connecting plate, arranged on the locking plate; and an elastic telescopic member, arranged between the first connecting plate and the second connecting plate, and used to pull the locking plate toward the locking groove; the folding transmission plate forms two rotation centers between the first joint and the second joint respectively.

3. The two-section folding hook assembly according to claim 2, wherein: A first hinge groove having an opening is formed in the first joint, so that a first portion and a second portion opposite to the first portion are formed on the first joint; A locking groove is formed on the first part; a second hinge groove with an opening is formed in the second joint, so that a third part and a fourth part opposite to the third part are formed on the second joint; a guide groove is formed on the third part; wherein the opening of the first hinge groove and the opening of the second hinge groove are arranged opposite to each other to accommodate the folding transmission plate; the locking groove and the guide groove are arranged opposite to each other to accommodate the locking plate.

4. The two-section folding hook assembly according to claim 3, wherein: The second joint has a top plate covering the top of the guide groove, and the top plate and the guide groove form a sliding channel for the locking plate to slide; correspondingly, the first connecting plate is arranged on the top plate close to the locking groove, and the second connecting plate is arranged on the locking plate away from the locking groove; the two ends of the elastic telescopic member are respectively arranged on the first connecting plate and the second connecting plate, and are in a stretched state; the height of the second connecting plate is greater than the height of the sliding channel, so that the second connecting plate can block the end of the sliding channel away from the locking groove.

5. The two-section folding hook assembly according to claim 3, wherein: The two ends of the folding transmission plate are arc-shaped; the first joint has a first arc-shaped end surface, in which the first hinge groove is formed; the second joint has a second arc-shaped end surface, in which the second hinge groove is formed; the first arc-shaped end surface and the second arc-shaped end surface are arranged opposite to each other; the elastic telescopic member is provided with two and symmetrically arranged between the two sets of first connecting plates and the second connecting plates respectively; the elastic telescopic member is a tension spring.

6. The two-section folding hook assembly according to claim 3, wherein: A first through hole is provided in the first part and the second part of the first joint, and the first pin passes through the two first through holes and the folding transmission plate located between the first through holes, so that the first joint and the folding transmission plate are rotatably connected to each other; a second through hole is provided in the third part and the fourth part of the second joint, and the second pin passes through the two second through holes and the folding transmission plate located between the second through holes, so that the second joint and the folding transmission plate are rotatably connected to each other; the ends of the first pin and the second pin are fastened with nuts; further, a first pin slot is formed in the first part of the first joint, which is deeper than the locking slot; the head of the first pin is located in the first pin slot to form a part of the locking slot, which can abut against the locking plate; a second pin slot is formed in the third part of the second joint, which is deeper than the guide slot; the head of the second pin is located in the second pin slot to form a part of the guide slot, which abuts against the locking plate.

7. The two-section folding coupler assembly according to claim 3, wherein: The coupler assembly also includes a pull rope, which is arranged on the locking plate and is used to pull the locking plate outward, so that the locking plate is disengaged from the locking groove by overcoming the pulling force of the elastic telescopic member.

8. The two-section folding coupler assembly according to claim 7, wherein: The coupler assembly also includes: a pull ring, which is arranged at the outer end of the pull rope; a guide wheel, which is arranged at the path of the pull rope and allows the pull rope to pass through the guide wheel; and a placement frame, which is arranged on one side of the guide wheel and is used to place the pull ring and can be connected with the pull ring buckle.

9. The two-section folding hook assembly according to claim 4, wherein: The coupler assembly further includes a limiting plate, which is disposed at any side of the folding transmission plate or the first joint or the second joint to limit the deflection direction of the first joint and the second joint; The deflection angle between the first joint and the second joint ranges from 0° to 180°.

10. A rail vehicle, wherein: A two-section folding coupler assembly comprising any one of claims 1 to 9; the coupler assembly is installed between a coupling system and a buffer system of a rail vehicle.

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