Opening and closing mechanism

Abstract

This utility model belongs to the field of rail vehicle technology and provides an opening and closing mechanism for rail vehicles. The opening and closing mechanism includes a fairing, a base, a rotating arm mechanism, and a traveling rail mounted on the base. The rotating arm mechanism includes multiple rotating arms connected in sequence, with the first rotating arm shaft-connected to the base, and any rotating arm connected to the fairing. Among the multiple rotating arms, the last rotating arm is equipped with a traveling rail mating structure located within the traveling rail. Through the linkage of the multiple rotating arms, the rotating arm mating with the traveling rail can travel along the trajectory defined by the traveling rail. By changing the position and shape of the traveling rail, the trajectory control of the fairing can be achieved. This structure improves the controllability of the fairing's movement trajectory in the opening and closing mechanism, avoids motion interference between the fairing and other vehicle body components during opening and closing, and thus ensures the reliability of the fairing's movement.

Description

Technical Field

[0001] This utility model relates to the field of rail transit technology, and specifically to an opening and closing mechanism. Background Technology

[0002] As a component of the dynamic head shape of the EMU, the front opening and closing mechanism of the high-speed train is in a closed and locked state when the train is running alone, so that the high-speed train can form a complete aerodynamic shape, reduce wind resistance and wind noise during operation, and keep the train in a stable state at high speed. When multiple trains need to be coupled, the fairing needs to be in an open and locked position so that the couplers can be fully and unobstructedly coupled and can adapt to the influence of the coupler sway angle when running on different curve radii.

[0003] The fairing opening and closing motion control mechanism is used to control the opening and closing of the fairing. Since anti-climb devices or other devices are often installed at the front of the train, the space is relatively compact. During the opening and closing process, the opening and closing mechanism must avoid anti-climb devices and other internal components. It is necessary to control the movement trajectory of the fairing hatch to avoid interference with the front components of the vehicle.

[0004] In existing technologies, the opening and closing mechanism includes a rotating arm, and the opening and closing of the fairing is controlled by driving the rotating arm. This driving structure carries the risk that the fairing's movement trajectory cannot be fully controlled. In some scenarios, the fairing may interfere with other vehicle components during its movement, causing the fairing to fail to open properly or damage to other components.

[0005] In existing technologies, there are schemes that use multiple rotating arms to drive the opening and closing mechanism. The structure of multiple rotating arms increases the degree of freedom of the opening and closing mechanism and can also increase the adjustment range of the movement trajectory of the opening and closing mechanism, but it also increases the uncontrollability of the movement range of the opening and closing trajectory. Utility Model Content

[0006] The purpose of this utility model is to solve one of the above-mentioned technical problems by providing an opening and closing mechanism and a rail vehicle.

[0007] To achieve the above objectives, the first aspect of this application provides an opening and closing mechanism, the technical solution of which is that the opening and closing mechanism includes:

[0008] fairing;

[0009] Base;

[0010] Swing arm mechanism: includes multiple swing arms connected in sequence, with the first swing arm connected to the base and any swing arm connected to the fairing;

[0011] Travel rail: mounted on the base;

[0012] Among them, in the multi-section swing arm, the end swing arm is equipped with a traveling rail mating structure:

[0013] The traveling rail mating structure is located within the traveling rail.

[0014] In this embodiment, a multi-section rotating arm and a traveling rail are designed, with some sections of the rotating arm engaging with the traveling rail. Through the linkage of the multi-section rotating arms, the rotating arm engaging with the traveling rail can travel along the trajectory defined by the traveling rail. In practical applications, the position of the traveling rail can be configured according to the position of the vehicle's front-end components, and the shape of the traveling rail can be adjusted according to the opening and closing rotation requirements of the opening and closing mechanism. By changing the position and shape of the traveling rail, trajectory control of the fairing can be achieved. This structure improves the controllability of the fairing's movement trajectory in the opening and closing mechanism, avoids motion interference between the fairing and other vehicle body components during the opening and closing process, and thus ensures the reliability of the fairing's movement.

[0015] In conjunction with the first aspect, in one possible implementation of the first aspect, the rotating arm mechanism includes a front rotating arm and an end rotating arm, the front rotating arm and the end rotating arm being axially connected; the front rotating arm or the end rotating arm is connected to the flow guide.

[0016] In this embodiment, a two-section swing arm opening and closing structure is further provided. Due to the limited space at the front of the vehicle, the two-section swing arm structure can reduce the complexity of the fairing opening and closing structure, and solve the problem of fairing opening and closing motion trajectory control with the fewest possible sets of swing arms.

[0017] In conjunction with the first aspect, in one possible implementation of the first aspect, the rotating arm mechanism includes a first rotating arm, an intermediate rotating arm, and an end rotating arm that are sequentially axially connected, wherein the first rotating arm or the intermediate rotating arm is connected to the fairing.

[0018] In this embodiment, a three-section swing arm opening and closing structure is further provided. Compared to a two-section swing arm structure, the three-section swing arm structure increases the degree of freedom, accommodates more complex fairing surface shapes, and enables more flexible operation.

[0019] In conjunction with the first aspect, in one possible implementation of the first aspect, the traveling rail includes a track groove, and the traveling rail mating structure is disposed within the track groove.

[0020] In this embodiment, the form of the travel rail can be various; the embodiment used in this application is a track groove. The track groove can be a U-shaped groove or a V-shaped groove. The track groove completely "retains" the travel rail mating structure (such as a slider, roller, or hinged support) inside the groove, resulting in high motion stability of the travel rail mating structure and improving the reliability of motion trajectory precision control.

[0021] In conjunction with the first aspect, in one possible implementation of the first aspect, the traveling rail mating structure includes a roller and a wheel axle, the outer peripheral wall of the roller contacts the side wall of the track groove, one end of the wheel axle is connected to a corresponding rotating arm, the roller is installed at the opposite end of the connection end between the wheel axle and the rotating arm, and the roller is disposed in the track groove.

[0022] In this embodiment, considering the presence of dust in the vehicle's operating environment, excessive dust accumulation in the track groove will affect the normal movement of the walking device, preventing the fairing from opening and closing properly. Therefore, rollers are used as the walking mechanism. Even in harsh environments such as dust, the rollers can still maintain normal movement, improving the reliability of the fairing's opening and closing control and demonstrating high environmental adaptability.

[0023] In conjunction with the first aspect, in one possible implementation of the first aspect, the traveling rail mating structure further includes a friction wheel, which is mounted on a wheel axle and at the same end as the roller, with the friction wheel positioned relative to the roller near the bottom of the track groove.

[0024] In this embodiment, the friction wheel is located at the bottom of the axle and directly contacts the bottom of the track groove. The friction wheel can be made of wear-resistant material. On the one hand, the friction wheel can effectively provide gravity support for the fairing door, resulting in high overall structural stability; on the other hand, the friction wheel can also reduce the direct friction between the traveling structure and the track groove, improving the reliability of the structure.

[0025] In conjunction with the first aspect, in one possible implementation of the first aspect, the axle includes an external thread, and the rotating arm that is fitted with the axle has a threaded hole, and the axle is threadedly connected to the corresponding rotating arm.

[0026] In this embodiment, the wheel axle and the rotating arm are threaded together, which facilitates their installation and adjustment of their relative positions.

[0027] In conjunction with the first aspect, in one possible implementation of the first aspect, an adjusting nut is installed on the axle, the adjusting nut being located on the outer wall of the axle between the rotating arm and the track groove.

[0028] In this embodiment, the adjusting nut enables reliable fixing of the axle and allows for height adjustment of the axle. Height adjustment ensures that the friction wheel maintains contact with the bottom of the track groove.

[0029] In conjunction with the first aspect, one possible implementation of the first aspect further includes a power drive unit connected to the swing arm mechanism to drive the swing arm mechanism to move.

[0030] In this embodiment, the power drive unit can realize the automatic opening and closing adjustment of the opening and closing mechanism, solving the problem of inconvenience of manual operation adjustment.

[0031] The second aspect of this application provides a rail vehicle, including the opening and closing mechanism provided in the first aspect of this application.

[0032] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of this application more apparent, specific embodiments of this application are given below. Attached Figure Description

[0033] Figure 1 This is a first-view structural diagram of the opening and closing mechanism (two-section rotating arm) in the embodiments of this application.

[0034] Figure 2 This is a schematic diagram of the opening and closing mechanism (two-section rotating arm) from a second perspective in the embodiments of this application.

[0035] Figure 3 This is a schematic diagram of the closed state structure of the opening and closing mechanism guide shield in the embodiment of this application.

[0036] Figure 4 This is a first-view structural diagram of the opening and closing mechanism guide fairing in the open state in the embodiment of this application.

[0037] Figure 5 This is a second-view structural diagram of the opening and closing mechanism guide fairing in the open state in the embodiment of this application.

[0038] Figure 6 This is a partial enlarged view of the roller portion of the opening and closing mechanism in an embodiment of this application.

[0039] Figure 7 This application embodiment presents a schematic diagram of the opening and closing mechanism (three-section rotating arm).

[0040] 1. Main framework;

[0041] 2. Base;

[0042] 301. First fairing; 302. Second fairing;

[0043] 4. Anti-climb device;

[0044] 5. Traveling rail, 501-track groove;

[0045] 6. Front swing arm;

[0046] 7. End swing arm;

[0047] 8. Intermediate swing arm;

[0048] 9. Rollers;

[0049] 10. Wheels and axles;

[0050] 11. Friction wheel;

[0051] 12. Adjusting nut;

[0052] 13. Cylinder;

[0053] 14. Locking mechanism;

[0054] 15. Mounting bracket. Detailed Implementation

[0055] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0056] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0057] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0058] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0059] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] like Figures 1 to 2 The diagram shows the structure of the opening and closing mechanism. The main frame 1 is used to assemble the entire opening and closing mechanism onto the vehicle; the base 2 is mounted on the main frame 1 and serves as the supporting component for the opening and closing mechanism's drive unit. A first fairing 301 and a second fairing 302 are symmetrically installed in the opening area at the front end of the main frame 1. A rotating arm unit mounted on the base drives the opening and closing of the two fairings. The rear end of the main frame 1 can be assembled onto the vehicle. When the two fairings are driven to open relative to each other towards the sides of the vehicle, the opening area at the front end of the main frame 1 is open, enabling actions such as coupling. Anti-climb devices 4 are symmetrically installed on both sides of the internal frame space of the main frame 1 to absorb collision energy and ensure vehicle safety in the event of a collision.

[0061] Since the anti-climb device occupies the front space of the rail vehicle, if the movement trajectory of the fairing cannot be controlled, there is a risk of movement interference with the front of the anti-climb device when the fairing opens to both sides.

[0062] The movement trajectory of the fairing can be controlled by increasing the number of drive cylinders and using different drive cylinders to drive different rotating arm trajectories. This results in a more complex mechanical structure and automatic control principle for the opening and closing mechanism, leading to higher costs and reduced reliability.

[0063] To address the above problems, the first embodiment of this application provides an opening and closing mechanism.

[0064] refer to Figures 1 to 7 Similar to existing technologies, the opening and closing mechanism includes: a main frame 1, a fairing, and a base 2. In some embodiments, the fairing also includes a first fairing 301 and a second fairing 302.

[0065] The swing arm mechanism is used to drive the opening and closing of the fairing. The swing arm mechanism comprises multiple swing arms connected in sequence, with the first swing arm shaft-connected to the base 2, and any one swing arm connected to the fairing. It should be understood that the multi-segment swing arm can have two, three, or more segments. The swing arms located at both ends of the multi-segment swing arm are defined as the first swing arm 6 and the last swing arm 7, and the swing arm located between the first swing arm 6 and the last swing arm 7 is defined as the intermediate swing arm 8.

[0066] In order to drive the first fairing 301 and the second fairing 302 symmetrically, the rotating arm mechanism includes two sets, which are symmetrically arranged on the base 2 and are used to drive the two fairings respectively.

[0067] The travel rail 5 is mounted on the base 2. Among the multi-section swing arms, the end swing arm 7 is equipped with a travel rail mating structure: the travel rail mating structure is located inside the travel rail 5.

[0068] With the above structure, when the drive arm mechanism rotates, the drive arm mechanism will drive the fairing to open and close. Through the cooperation structure of the multi-section drive arm and the travel rail 5, the linkage of the multi-section drive arm and the drive arm cooperating with the travel rail can travel along the trajectory defined by the travel rail. Thus, the travel rail 5 plays a guiding role in the opening and closing path of the fairing.

[0069] In this embodiment, the travel rail 5 is a straight rail. It is arranged from the side near the fairing towards the rear end of the main frame 1. Furthermore, the gap between the two travel rails 5 near the fairing end is smaller than the gap between the two travel rails 5 near the main frame 1 end.

[0070] In practical applications, the position of the travel rail 5 can be configured according to the position of the vehicle's front-end components, and the shape of the travel rail can be adjusted according to the opening and closing rotation requirements of the opening and closing mechanism. By changing the position and shape of the travel rail, for example, a curved rail can be used, thus achieving trajectory control of the fairing. This structure improves the controllability of the fairing's movement trajectory in the opening and closing mechanism, avoids motion interference between the fairing and other vehicle body components during the opening and closing process, and thus ensures the reliability of the fairing's movement.

[0071] In some embodiments of this application, the swing arm mechanism consists of two swing arms, including a front swing arm 6 and a rear swing arm 7, with the front swing arm 6 and the rear swing arm 7 axially connected; the front swing arm 6 or the rear swing arm 7 is connected to the fairing, and a travel rail mating structure is installed on the rear swing arm 7: the travel rail mating structure is located within the travel rail 5. Figures 2 to 4 In the provided implementation structure, the end arm 7 is connected to a mounting base 15, and the mounting base 15 is fixedly installed to the guide fairing via fasteners.

[0072] It should be understood that the swing arm mechanism includes two symmetrically arranged front swing arms 6 and rear swing arms 7 on the base 2, with both front swing arms 6 axially connected to the base 2. In some embodiments, one rear swing arm 7 is connected to the first deflector 301, and the other rear swing arm 7 is connected to the second deflector 302. Both rear swing arms 7 are provided with a travel rail engaging structure, which is respectively arranged in the corresponding travel rail 5. In some embodiments, one front swing arm 6 is connected to the first deflector 301, and the other front swing arm 6 is connected to the second deflector 302. Both rear swing arms 7 are provided with a travel rail engaging structure, which is respectively arranged in the corresponding travel rail 5.

[0073] In some embodiments of this application, the swing arm mechanism can also be designed as a three-section swing arm. (See reference...) Figure 7 The swing arm mechanism includes a first swing arm 6, a middle swing arm 8, and a last swing arm 7 connected sequentially by shafts. The first swing arm 6 or the middle swing arm 8 is connected to the fairing, and the last swing arm is equipped with a travel rail mating structure: the travel rail mating structure is located within the travel rail 5. Compared with the two-section swing arm structure, the three-section swing arm structure increases the degree of freedom, accommodates more complex fairing surface shapes, and can achieve more flexible mating.

[0074] For example, two sets of three-section rotating arms are symmetrically arranged on both sides of the base 2. The first rotating arm 6 or the middle rotating arm 8 on one side is connected to the first guide shroud 301, and the first rotating arm 6 or the middle rotating arm 8 on the other side is connected to the second guide shroud 302, which are used to control the opening and closing of the guide shrouds on both sides respectively.

[0075] It should be understood that the direction of the travel rail 5 can be designed according to the configuration and installation of the front-end components of the vehicle body. Through the cooperation structure of the multi-section swing arm and the travel rail 5, the application can realize the control of the opening and closing trajectory of the double-sided fairing, and avoid motion interference between the fairing and the front-end components of the vehicle body.

[0076] In some embodiments of this application, the structure of the walking rail 5 is further designed as follows.

[0077] In this embodiment, the traveling rail 5 is a groove-type traveling rail, which includes a track groove 501, and the traveling rail mating structure is disposed within the track groove 501. The track groove 501 can be a U-shaped groove or a V-shaped groove. In order to enable the traveling rail mating structure to move more stably, the track groove 501 is preferably a U-shaped groove. The track groove 501 completely "retains" the traveling rail mating structure (such as a slider, roller, or hinged support) inside the groove, resulting in high motion stability of the traveling rail mating structure and improving the reliability of motion trajectory precision control.

[0078] To facilitate engagement with the U-shaped track groove 501, the traveling rail engagement structure includes a roller 9 and an axle 10. The roller 9 is disposed within the track groove 501, with its outer peripheral wall contacting the side wall of the track groove 501. During the movement of the rotating arm mechanism, the roller 9 moves along the track groove 501, its outer peripheral wall contacting the side wall of the track groove 501. The roller 9 is connected to the rotating arm via the axle 10. Specifically, one end of the axle 10 is connected to the corresponding end rotating arm 7, and the roller 9 is mounted on the opposite end of the axle 10 and the rotating arm connection end. It should be understood that a mounting structure capable of relative rotation is formed between the roller 9 and the axle 10; for example, they can be connected via bearings.

[0079] Compared to the sliding block and slide rail combination structure, the combination structure of roller 9 and track groove 501 can form a more stable walking combination structure. When dust and other impurities fall into the walking rail, it is not easy for the walking to get stuck, which can improve the reliability of the opening and closing control of the guide fairing.

[0080] Since friction is generated between the roller 9 and the travel rail 5, the roller 9 is preferably made of a material with a low coefficient of friction to achieve high wear resistance, low coefficient of friction and impact resistance, thereby effectively reducing wear and extending service life.

[0081] If the bottom of roller 9 directly contacts the bottom of the travel rail 5, the bottom of roller 9 will still be prone to wear because the movement between the bottom of roller 9 and the travel rail 6 is a relative movement within a plane. To solve this problem, the travel rail mating structure also includes a friction wheel 11. (Reference) Figure 6 The friction wheel 11 is mounted on the axle 10 and is mounted at the same end as the roller 9. The friction wheel 11 is close to the bottom of the track groove relative to the roller.

[0082] To improve wear resistance, the friction wheel 11 is preferably made of a highly wear-resistant material. When the roller 9 moves along the track groove, the friction wheel 11 contacts the bottom of the track groove, avoiding direct contact between the roller 9 and the bottom of the groove, thus preventing friction damage.

[0083] In addition to its wear-resistant properties, the friction wheel 11 also provides support for the mounting structure between the roller 9, the axle 10, and the rotating arm, thereby supporting the gravity of the fairing and ensuring the stable operation of the opening and closing mechanism.

[0084] For example, the roller 9, the friction wheel 11 and the axle 10 are preferably installed with a threaded connection, which facilitates replacement in case the roller 9 or the friction wheel 11 is damaged.

[0085] In some embodiments of this application, to solve the installation problem between the axle 10 and the shaft, a threaded hole is provided in the part where the rotating arm and the axle 10 are installed. The axle 10 includes an external thread, and the axle 10 passes through the threaded hole and is threadedly connected to the corresponding rotating arm. The threaded connection facilitates the adjustment of the extension length of the axle 10 relative to the rotating arm, thereby enabling the adjustment of the position of the friction wheel 11 and ensuring that the friction wheel 11 can contact the bottom of the track groove.

[0086] Furthermore, an adjusting nut 12 is installed on the axle 10, located on the outer wall of the axle 10 between the rotating arm and the track groove 501. The adjusting nut 12 is used to assist in fixing the connection position between the axle 10 and the rotating arm, and can realize the height adjustment of the axle. Through height adjustment, it can be ensured that the friction wheel 11 is in contact with the bottom of the track groove 501.

[0087] In some embodiments of this application, the opening and closing mechanism further includes a power drive unit connected to the swing arm mechanism to drive the swing arm mechanism to move.

[0088] In some embodiments of this application, the power drive unit can realize automatic opening and closing adjustment of the opening and closing mechanism, solving the problem of inconvenience of manual operation adjustment. For example, the power drive unit can be a cylinder 13. A cylinder mounting bracket is provided on the base 2, and the cylinder 13 is fixed to the base 2 through the cylinder mounting bracket. The cylinder is connected to the first-end rotating arm 6. When the cylinder rod extends, it drives the first-end rotating arm 6 to rotate, and the other rotating arms move in tandem, driving the deflector to open; when the cylinder rod retracts, the deflector closes. It should be understood that, in order to drive the double-sided deflector, two sets of cylinders 13 can be symmetrically arranged on the base 2, each set of cylinders 13 connected to a set of rotating arm mechanisms for driving one side of the deflector.

[0089] It should be understood that the fairing can also be opened and closed manually if cylinder 13 is not installed.

[0090] In some embodiments of this application, the opening and closing mechanism further includes a locking mechanism 14. The locking mechanism 14 is used for locking the opening and closing mechanism in its open and closed states. The locking mechanism 14 is axially connected to the base 2, and one end is connected to the first end rotating arm 6. The internal structure of the locking mechanism 14 is prior art, and the cooperation structure between the locking mechanism 14 and the first end rotating arm 6 is also prior art. The embodiments of this application do not involve improvements to these two parts, and will not be described in detail.

[0091] The second aspect of this application provides a rail vehicle, including the opening and closing mechanism provided in the first aspect of this application. By using this opening and closing mechanism in a rail vehicle, the position of the motion guide rail, the shape of the track extension, etc., can be changed to allow the rail vehicle's fairing hatch to open or close along a specific trajectory, solving the problem of the opening and closing mechanism avoiding components such as anti-climb energy-absorbing devices inside the vehicle.

[0092] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An opening and closing mechanism, characterized in that, include: fairing; Base; Swing arm mechanism: includes multiple swing arms connected in sequence, with the first swing arm connected to the base and any swing arm connected to the fairing; Travel rail: mounted on the base; Among them, in the multi-section swing arm, the end swing arm is equipped with a traveling rail mating structure: The traveling rail mating structure is located within the traveling rail.

2. The opening and closing mechanism as described in claim 1, characterized in that, The rotating arm mechanism includes a front rotating arm and an end rotating arm, wherein the front rotating arm and the end rotating arm are axially connected; the front rotating arm or the end rotating arm is connected to the flow guide.

3. The opening and closing mechanism as described in claim 1, characterized in that, The rotating arm mechanism includes a first rotating arm, a middle rotating arm, and an end rotating arm that are sequentially axially connected, and the first rotating arm or the middle rotating arm is connected to the flow guide.

4. The opening and closing mechanism as described in any one of claims 1 to 3, characterized in that, The traveling rail includes a track groove, and the traveling rail mating structure is disposed within the track groove.

5. The opening and closing mechanism as described in claim 4, characterized in that, The traveling rail mating structure includes rollers mounted on a rotating arm, with the outer peripheral wall of the rollers contacting the side wall of the rail groove.

6. The opening and closing mechanism as described in claim 5, characterized in that, The traveling rail mating structure also includes a wheel axle, one end of which is connected to a corresponding rotating arm. The roller is installed at the opposite end of the wheel axle and the rotating arm connection end, and the roller is set in the track groove.

7. The opening and closing mechanism as described in claim 6, characterized in that, The traveling rail mating structure also includes a friction wheel, which is mounted on a wheel axle and at the same end as the roller. The friction wheel is located near the bottom of the track groove relative to the roller.

8. The opening and closing mechanism as described in claim 6 or 7, characterized in that, The axle includes an external thread, and the rotating arm that is installed in conjunction with the axle has a threaded hole. The axle is threadedly connected to the corresponding rotating arm.

9. The opening and closing mechanism as described in claim 8, characterized in that, An adjusting nut is installed on the axle, and the adjusting nut is located on the outer wall of the axle between the rotating arm and the track groove.

10. The opening and closing mechanism as described in claim 1, characterized in that, It also includes a power drive unit, which is connected to the swing arm mechanism to drive the swing arm mechanism to move.

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