Double-opening sliding plug door system

Abstract

The invention discloses a double-opening sliding plug door system which comprises a bearing driving mechanism, a door leaf, a lower swing guiding device, a vertical synchronous rod assembly and a middle restraining lock hook, and the door leaf, the lower swing guiding device, the vertical synchronous rod assembly and the middle restraining lock hook are arranged in a bilateral symmetry mode relative to the center of the door system. An end restraint device on the bearing driving mechanism is used for restraining the two ends of the cross beam, and a cross beam multi-point restraint device of the cross beam assembly is constructed by combining a middle nut assembly over-dead-point locking device; a rotating arm on the vertical synchronous rod assembly reliably restrains the upper part of the door leaf rear stop; the vertical synchronous rod assembly drives the lower swing guide device to lock the lower portion of the door leaf rear stop in the X direction and the Y direction, the lower portion of the door leaf can be inserted in the direction of about 35 degrees, and the stop pin can restrain the lower portion of the door leaf front stop. A reliable multi-point restraint system of the door system is constructed by combining the mutual coupling effect of the restraint lock hook and the lock catch in the middle of the rear stop, and the bearing strength of the door system is high; the door system has good static and dynamic sealing performance.

Description

Technical Field

[0001] The present application relates to the technical field of rail vehicle doors, and in particular to a double-opening plug sliding door system. Background Art

[0002] In recent years, with the increase in operating speeds of urban rail vehicles, the increase in train lengths, and the reduction in tunnel cross-sections, the aerodynamic loads on the door system during vehicle operation have increased, making it increasingly difficult to ensure the sealing of urban rail double-sliding plug doors. The sealing performance of double-sliding plug doors is closely related to the door leaf restraint stiffness and the structure of the sealing strip.

[0003] Patent CN112901002A discloses a double-opening plug sliding door system with a multi-point restraint system and airtight rubber strips. While the system exhibits good dynamic sealing performance, it utilizes a drive shaft nearly as long as the mechanism to transmit power to both ends of the crossbeam to achieve side restraint and power transmission. This results in high system complexity and a large space requirement. The side auxiliary locking device employed is complex and costly. A three-roller swing arm and a balancing wheel are used to provide lower guidance and address the issue of the two door leaves easily separating in the X-direction (vehicle length direction). However, the balancing wheel forms a force-amplifying lever in the door system, generating a large downward load, which in turn places a significant load on the mechanism, potentially leading to high transmission resistance, jamming, and even component breakage. Furthermore, the double-lip airtight rubber strip structure employed in the system exhibits a high rebound force when the rubber strip is compressed heavily, affecting the door closing function. However, when the rubber strip is compressed lightly, the compression provided by the rubber strip support arm decreases, degrading the sealing performance. This means that the system is unable to maintain a moderate compression force on both lips at varying compression levels.

[0004] In summary, how to achieve effective constraint of the door system is our goal. Furthermore, how to make the door system have good static and dynamic sealing performance under effective constraint is also the purpose of our improvement. Summary of the Invention

[0005] The purpose of this application is to provide a double-opening sliding door system, which has a restraint system with high rigidity and a rubber strip with good sealing performance. The restraint system has a simple structure, occupies a small space, and does not bring a large load to the load-bearing drive.

[0006] To achieve the above objectives, this application is implemented using the following technical solutions: The present application discloses a double-opening plug sliding door system, a load-bearing drive mechanism, the load-bearing drive mechanism is fixed to the vehicle body, and an end restraining device is rotatably mounted on the load-bearing drive mechanism; a pair of door leaves, the two door leaves being movably arranged on the carrying drive mechanism, the two door leaves having a first position of inner plug closing and a second position of separation and expansion, and when the door leaves are switched from the second position to the first position, the end restraint device is moved to limit the door leaves; A middle restraining lock hook, the middle restraining lock hook is fixed to the vehicle body, and when the door leaf is placed in the first position, the middle restraining lock hook is coupled with a second lock buckle in the middle of the rear stop of the door leaf; A lower swing guide device is fixed to the bottom of the vehicle body, and the lower swing guide device includes a swing arm drive shaft and a stopper. A vertical synchronization rod assembly is connected between the swing arm drive shaft and the carrying drive mechanism. When the door leaf is switched from the second position to the first position, the carrying drive mechanism drives the vertical synchronization rod assembly, and then drives the swing arm drive shaft, so that the stopper can realize the movement guidance and limitation of the lower part of the door leaf.

[0007] Furthermore, the load-bearing driving mechanism also includes a frame, a rotary drive rod, a nut assembly, a transmission frame, a crossbeam, and a door-carrying frame assembly; the frame is fixedly connected to the vehicle body, the rotary drive rod is rotatably connected to the frame, the nut assembly and the rotary drive rod form a screw-nut pair connection, and the transmission frame and the nut assembly and the crossbeam are rotatably connected; the crossbeam is supported by the frame and can move on the frame along the horizontal direction of the vehicle width, the door-carrying frame assembly can move along the length direction of the crossbeam, and the door leaf is fixed on the door-carrying frame assembly; the nut assembly, the transmission frame and the crossbeam constitute a crank slider mechanism; when approaching the first position, the rotary drive rod drives the nut assembly to rotate, thereby realizing the driving of the crossbeam in the horizontal direction of the vehicle width and over-dead point locking; when the door leaf is inserted into place, the end restraint device realizes the restraint of the two ends of the crossbeam.

[0008] Furthermore, the end restraint device is located in the vicinity of both ends of the crossbeam, and the end restraint device includes a cam mechanism and a lock hook and lock buckle restraint pair; the cam mechanism includes a cam and a follower, the cam is fixed to the end of the rotary drive rod, and the follower is rotatably connected to the frame; the lock hook and lock buckle restraint pair includes a lock hook and a first lock buckle, the lock hook is fixed to the follower, and the first lock buckle is fixed to the crossbeam; The movements of the lock hook and the first lock buckle are coordinated with each other. When the rotary drive rod and the cam rotate together, the follower swings together with the lock hook, cooperating with the pulling movement of the beam, so that the lock hook and the first lock buckle are coupled to achieve constraint on the two ends of the beam.

[0009] Furthermore, when the lock hook is coupled to the first lock buckle, the angle ψz between the line connecting the rotation center of the lock hook to the rotation center of the cam and the line connecting the rotation center of the cam to the maximum lift point of the cam is: -35°≤ψz≤-1°, and the lock hook and the first lock buckle have a certain overlap.

[0010] Furthermore, when the lock hook is coupled to the first lock buckle, the force between the lock hook and the first lock buckle acts on the swing center of the lock hook.

[0011] Furthermore, the bearing drive mechanism further comprises an upper slide, the upper slide being provided on the frame, the upper slide comprising a straight section, a curved section and a groove section, the straight section, the curved section and the groove section being connected by arc transitions, the groove section being perpendicular to the straight section, and the groove section being used to form an X-direction constraint on the door leaf in the closed state; A roller is fixed to the top of the door carrying frame assembly, and the roller is clamped in the upper slideway to control the movement trajectory of the door leaf.

[0012] Furthermore, the vertical synchronization rod assembly includes a synchronization rod, an upper rotating arm and a connecting rod. The upper part of the synchronization rod is rotatably connected to the vehicle body, the upper rotating arm is fixedly connected to the upper part of the synchronization rod, and the two ends of the connecting rod are respectively rotationally connected with the upper rotating arm and the crossbeam assembly. The lower part of the synchronization rod is fixedly connected to the swing arm drive shaft.

[0013] Furthermore, the front stop of the door leaf is provided with a finger-guard rubber strip; The upper, lower and rear sections of the door leaf are provided with continuous peripheral sealing strips, and the peripheral sealing strips include an eight-shaped lip; When the door panels are inserted into place, the finger-guard strips of the left and right door panels come into contact and squeeze with each other, and the splayed lips of the peripheral sealing strips come into contact and squeeze with the sealing surface on the vehicle body. A door sill and a molding are fixed to the vehicle body, and the door sill and the outer surface of the molding form the sealing surface. A stop pin is also fixed to the bottom of the door panels. When the two door panels are closed and acted upon by the lower swing guide, the stop pin couples with the insert on the door sill to limit the lower portion of the front stop of the door panels.

[0014] Furthermore, the peripheral sealing strip further includes an installation anchor point, an inner support arm, an outer support arm and a pressure balance hole; A rubber strip cavity is formed between the inner support arm and the outer support arm, the figure-eight lip is arranged at the intersection of the inner support arm and the outer support arm, and the figure-eight lip cantilever is arranged at the installation anchor point of the peripheral sealing rubber strip; the pressure balance hole is arranged on the inner support arm, and the outer support arm is concave toward the rubber strip cavity, and maintains the concave trend under negative pressure conditions outside the vehicle.

[0015] Furthermore, the peripheral sealing strip further comprises a leaning arm, one end of the leaning arm is connected to the mounting anchor point, and the other end is connected to the outer support arm, and one end of the inner support arm is connected to the outer support arm, and the other end is connected to the mounting anchor point; The distance from the intersection of the leaning arm and the outer support arm to the installation anchor point is greater than the distance from the installation anchor point to the perpendicular line of the splayed lip and the outer side surface of the leaning arm.

[0016] The beneficial effects of this application are: The end restraint device of the present application realizes the restraint on the two ends of the beam, and combines with the dead point locking device of the middle nut assembly to construct a multi-point restraint device of the beam assembly; based on the multi-point restraint device of the beam and the vertical synchronization rod assembly, the hook-shaped portion of the upper rotating arm can reliably restrain the upper part of the rear stop of the door leaf; the lower swing guide device can realize X and Y direction locking and X direction compression of the lower part of the rear stop of the door leaf, and the lower swing guide device can also make the lower part of the door leaf inserted in the direction of about 35° so that the stop pin can form a restraint on the lower part of the front stop of the door leaf; combined with the mutual coupling effect of the restraint lock hook and the lock buckle in the middle of the rear stop, a reliable multi-point restraint system for the door system is constructed, and the door system has high bearing strength.

[0017] The door system is in a multi-point constraint state. Under static working conditions, the peripheral sealing strip is in squeeze contact with the sealing surface, and the finger guard strips of the left and right door leaves are squeezed against each other, and the door system has good sealing performance; under positive pressure conditions outside the vehicle, the outer sealing lip will be more reliably pressed against the sealing surface, achieving effective peripheral sealing under this working condition; under negative pressure conditions outside the vehicle, the door system is in a multi-point constraint state. The Y-direction displacement of each point of the door leaf is small under the action of air pressure. In addition, the pressure difference causes the gas inside the vehicle to enter the cavity of the peripheral sealing strip through the pressure balance hole. The cavity expands directionally, and the outer support arm always maintains an inward concave trend. The displacement of the intersection point of the eight-shaped lip is very small, and the inner sealing lip can always be in contact and squeeze with the sealing surface. Therefore, it still has effective peripheral sealing under negative pressure conditions. In summary, the reliable multi-point constraint of the door system combined with the design of the sealing strip makes the door system have good static and dynamic sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of the double-opening sliding door of this application; Figure 2 This is a cross-sectional schematic diagram of the load-bearing drive mechanism of this application; Figure 3 This is a cross-sectional diagram of the double-opening sliding door system of this application; Figure 4 Schematic diagram of the upper side restraint structure of the door system of this application (the upper side restraint structure movement stage); Figure 5 This is a graph showing the gap δ between the lock hook and the first lock buckle at different ψz values ​​in this application; Figure 6 This is a schematic diagram of the locking hook restraint structure in the middle of this application; Figure 7 This is a schematic diagram of the structure of the lower swing guide device of this application; Figure 8 This is a schematic diagram of the retaining pin constraint structure of this application.

[0019] Including: 1. Bearing drive mechanism; 2. Door leaf; 3. Lower swing guide device; 4. Vertical synchronization rod assembly; 5. Middle restraining lock hook; 6. Door sill; 7. Pressing strip; 101, frame; 102, rotary drive rod; 103, nut assembly; 104, transmission frame; 105, beam assembly; 1051, beam; 1052, first lock; 106. Door carrier assembly; 107. Upper slide; 108. End restraint device; 1081. Cam; 1082. Follower; 1083. Lock hook; 201, stop pin; 202, peripheral sealing strip; 2021, inner support arm; 2022, outer support arm; 2023, figure-eight lip; 2024, pressure balance hole; 203. Finger guard strip; 204. Second lock buckle; 301, swing arm drive shaft; 401. Synchronizing rod; 402. Upper rotating arm; 403. Connecting rod. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by this application easy to understand, this application is further explained below in conjunction with specific implementation methods.

[0021] It should be noted that in the description of this application, the terms "front", "rear", "left", "right", "up", "down", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and do not require that this application must be constructed and operated in a specific direction. Therefore, they should not be understood as limiting this application. The terms "front", "rear", "left", "right", "up", and "down" used in the description of this application refer to directions in the accompanying drawings, and the terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0022] like Figure 1-Figure 7 As shown, the present application discloses a double-opening plug sliding door system, including a load-bearing drive mechanism 1, a door leaf 2, a lower swinging guide device 3, a vertical synchronization rod assembly 4 and a middle restraining lock hook 5, and the door leaf 2, the lower swinging guide device 3, the vertical synchronization rod assembly 4 and the middle restraining lock hook 5 are arranged symmetrically about the center of the door system.

[0023] The load-bearing drive mechanism 1 includes a frame 101, a rotary drive rod 102, a nut assembly 103, a crossbeam 1051, a door frame assembly 106 and an end restraint device 108; the frame 101 is fixedly connected to the vehicle body, the rotary drive rod 102 is rotatably connected to the frame 101, the crossbeam 1051 is supported by the frame 101, and can move on the frame 101 along the horizontal direction of the vehicle width, the door frame assembly 106 can move along the length direction of the crossbeam, and the door leaf 2 is fixed on the door frame assembly 106; the nut assembly 103 is rotatably connected to the rotary drive rod 102, and the rotary drive rod 102 drives the nut assembly 103 to rotate to realize the driving of the crossbeam along the horizontal direction of the vehicle width and the over-dead point locking; when the door leaf 2 is inserted into place, the end restraint device 108 realizes the constraint of the two ends of the crossbeam.

[0024] The lower swing guide device 3 is fixed to the lower part of the vehicle body, and the lower swing guide device 3 includes a swing arm drive shaft 301 and a stopper; the top end of the vertical synchronization rod assembly 4 is connected to the crossbeam, and the bottom end is connected to the swing arm drive shaft 301, so that when the crossbeam moves, the swing arm drive shaft 301 is driven to move through the vertical synchronization rod assembly 4, so that the stopper can inhibit the separation of the door leaf 2 along the vehicle length direction during the door leaf 2 insertion process and after it is inserted into place.

[0025] The middle restraining lock hook 5 and the door sill 6 are fixed on the vehicle body. When the door leaf 2 is inserted into place, the middle restraining lock hook 5 is coupled with the second lock buckle 204 in the middle of the rear stop of the door leaf 2; a stop pin 201 is provided at the lower part of the front stop of the door leaf 2. When the door leaf 2 is inserted into place, the stop pin 201 is coupled with the embedment on the door sill 6.

[0026] When the door is opened in this application, the rotary drive rod 102 begins to rotate, and the rotation of the rotary drive rod 102 is transmitted to the crossbeam through the nut assembly 103, pushing the crossbeam to move horizontally along the width of the vehicle. The movement of the crossbeam drives the door frame assembly 106 to move along the length direction of the crossbeam, thereby driving the door leaf 2 to open outward. As the door frame assembly 106 moves, the door leaf 2 begins to unfold outward. While the door leaf 2 moves, the vertical synchronization rod assembly 4 rotates with the movement of the crossbeam, thereby driving the swing arm drive shaft 301 in the lower swing guide device 3 to move. The movement of the swing arm drive shaft 301 causes the stopper to move away from the restricted position, allowing the door leaf 2 to move freely along the length direction of the vehicle.

[0027] When the door is closed, the rotary drive rod 102 is rotated in the opposite direction. The reverse rotation of the rotary drive rod 102 is transmitted to the crossbeam through the nut assembly 103, pushing the crossbeam to move in the opposite direction along the vehicle width horizontal direction.

[0028] The movement of the crossbeam drives the door carrier assembly 106 to move along the length of the crossbeam, thereby driving the door leaf 2 to close inward. As the door carrier assembly 106 moves, the door leaf 2 begins to close inward. The movement of the door leaf 2 drives the swing arm drive shaft 301 to move through the vertical synchronization rod assembly 4, causing the stopper to return to the restricted position, thereby inhibiting the door leaf 2 from separating along the vehicle length direction during and after the door leaf 2 is inserted. The rotating drive rod 102 drives the nut assembly 103 to rotate to achieve the driving of the crossbeam in the horizontal direction of the vehicle width and the over-dead point locking; when the door leaf 2 is inserted into place, the end restraint device 108 locks the crossbeam to achieve the end restraint of the crossbeam.

[0029] The middle restraining lock hook 5 is coupled with the second lock buckle 204 in the middle of the rear stop of the door leaf 2 to further enhance the stability of the door leaf 2. The stop pin 201 at the lower front stop of the door leaf 2 is coupled with the insert on the threshold 6 to ensure the sealing of the lower front stop of the door leaf 2.

[0030] In summary, the end restraint device 108 of the present application realizes the restraint on the two ends of the beam, and combined with the dead point locking device of the middle nut assembly 103, a multi-point restraint device of the beam assembly is constructed; based on the multi-point restraint device of the beam and the vertical synchronization rod assembly, the hook-shaped portion of the upper rotating arm can reliably restrain the upper part of the rear stop of the door leaf; in addition to realizing X and Y direction locking and X direction compression of the lower part of the rear stop of the door leaf, the lower swing guide device can also make the lower part of the door leaf inserted in the direction of about 35° so that the stop pin can form a restraint on the lower part of the front stop of the door leaf; combined with the mutual coupling effect of the restraint lock hook and the lock buckle in the middle of the rear stop, a reliable multi-point restraint system for the door system is constructed, and the door system has high bearing strength.

[0031] The present application is described below through specific embodiments.

[0032] A double-opening plug sliding door system consists of a load-bearing drive mechanism 1, a door leaf 2, a lower swinging guide device 3, a vertical synchronization rod assembly 4, a middle restraining lock hook 5 fixedly connected to the vehicle body, a door sill 6, a pressure strip 7, etc., wherein the load-bearing drive mechanism 1, the lower swinging guide device 3, the middle restraining lock hook 5, the door sill 6, and the pressure strip 7 are all fixedly connected to the vehicle body, and the door leaf 2, the lower swinging guide device 3, the vertical synchronization rod assembly 4, and the middle restraining lock hook 5 are all arranged left-right symmetrically about the center of the door system.

[0033] The bearing drive mechanism 1 of this embodiment is described in detail as follows: like Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the carrying drive mechanism 1 includes a frame 101 fixedly connected to the vehicle body, a rotating drive rod 102 rotatably connected to the frame 101, a nut assembly 103, a transmission frame 104 rotatably connected to the nut assembly 103, a beam assembly 105 rotatably connected to the transmission frame 104, a door carrying frame assembly 106 movable along the length direction of the beam assembly 105, and an end restraint device 108; the beam assembly 105 includes a beam 1051 and a first lock buckle 1052 arranged at the end of the beam 1051.

[0034] The end restraint device 108 consists of a cam 1081, a follower 1082, a lock hook 1083, etc. The cam 1081 is fixedly connected to the area near the two ends of the rotating drive rod 102, the follower 1082 is rotatably connected to the frame 101, and the lock hook 1083 is fixedly connected to the follower 1082. The cam 1081 and the follower 1082 that rotate together with the rotating drive rod 102 form a cam mechanism, and the follower 1082 swings under the drive of the cam 1081; when closing the door, the swinging lock hook 1083 will couple with the first lock buckle 1052 on the beam 1051, forming a Y-direction (Y-direction, horizontal direction of the vehicle width) constraint on the end of the beam assembly 105.

[0035] In one embodiment, Figure 2 As shown, the carrying drive mechanism 1 also includes an upper slide 107, which is arranged on the frame 101 and includes a straight section, a curved section, and a groove section. The straight section is arranged along the length of the vehicle, the groove section is perpendicular to the straight section, and the sections are connected by arc transitions. The groove section is used to form an X-direction constraint on the door leaf 2 in the closed state; the roller above the door frame assembly 106 is clamped in the upper slide 107, thereby controlling the upper movement trajectory of the door leaf 2. Further, such as Figure 3 As shown, the nut assembly 103 is rotatably mounted on the rotary drive rod 102. The rotary drive rod 102 is provided with threads, and the nut assembly 103 and the rotary drive rod 102 form a screw-nut pair connection. Furthermore, a transmission frame 104 is included. One end of the transmission frame 104 is rotatably connected to the nut assembly 103, and the other end is rotatably connected to the crossbeam 1051. The nut assembly 103, the transmission frame 104, and the crossbeam 1051 form a crank slider mechanism. When closing the door, when the rotary drive rod 102 rotates and drives the end of the transmission frame 104 to rotate to form a dead center state, achieving central locking.

[0036] Furthermore, Figure 3 As shown, the transmission frame 104 has a receiving cavity. When the rotary drive rod 102 rotates clockwise, so that the nut assembly 103 is located in the receiving cavity, the transmission frame 104 is in a past-dead-point state and cannot rotate further, thus achieving a past-dead-point locking of the crossbeam 1051. To unlock, the rotary drive rod 102 is rotated counterclockwise.

[0037] like Figure 4 As shown, the end restraint device 108 of the present application includes a follower 1082, a cam 1081 and a locking hook 1083. The cam 1081 is symmetrically arranged about the center of the rotary drive rod 102. The follower 1082 is rotatably connected to the side of the frame 101. The locking hook 1083 is fixedly connected to the follower 1082 or integrated into a whole, and the swing center of the two is the same, denoted as O2. The first lock buckle 1052 is fixedly mounted on the crossbeam 1051 and can move in the Y direction following the crossbeam 1051, that is, the Sierra motion. The power of the mechanism drives the rotary drive rod 102, thereby driving the cam 1081 to rotate, and the distributed power transmission of the mechanism can be realized without the need for additional power sources and transmission rods.

[0038] In a further embodiment, Figure 4 As shown in (b), the cam 1081 is fixedly connected to the rotating drive rod 102 at a certain phase, and the fixed connection method can be end face tightening, set screws, etc.

[0039] The follower 1082 and the cam 1081 form a cam mechanism. In some further embodiments, the cam mechanism formed by the cam 1081 and the follower 1082 can be a conventional cam mechanism, such as Figure 4 As shown in (a), an eccentric wheel and a fork-shaped follower (with an open slot) are also preferred. The fork-shaped follower can be removed without removing the end structure of the rotary drive rod, which improves maintainability. Since the fork-shaped follower does not seal the open slot structure, it also has the advantage of taking up less space. In other embodiments, the follower 1082 can also adopt a closed slot. This closed slot design provides better force resistance but reduces maintainability. In this application, the open slot design is preferred.

[0040] The coupling process of the end restraint device 108 will be further explained below by analyzing it.

[0041] After the mechanism of the door system enters the plug section, the relative movement between the lock hook 1083 and the first lock buckle 1052 is mainly divided into three stages, the separation stage, the waiting coupling stage, and the coupling stage.

[0042] During the separation phase, the lock hook 1083 swings periodically around the swing center and the first lock buckle 1052 moves in the Y direction. The lock hook 1083 and the first lock buckle 1052 are far apart and their motion trajectories do not interfere with each other.

[0043] In the coupling stage, the lock hook 1083 first rotates clockwise and swings away from the first lock buckle 1052. At this time, the first lock buckle 1052 continues to enter along the Y direction and approaches the rear of the lock hook; then the lock hook 1083 swings counterclockwise toward the direction close to the first lock buckle 1052, and the lock hook reaches above the first lock buckle 1052; the two continue to move, and the lock buckle reaches the inner side of the lock hook 1083 until the Sierra movement of the first lock buckle 1052 basically stops.

[0044] During the coupling phase, the Serra motion stops, and hook 1083 continues to swing counterclockwise, hooking onto first latch 1052 with a certain overlap a. The interaction force F1 between the two is directed toward the center of the hook 1083's swing, so that the force F1 exerted by the first latch 1052 on the hook 1083 acts at the center of the swing and does not act on the transmission chain from cam 1081 to follower 1082. Hook 1083 hooks onto first latch 1052, thereby locking and constraining the end of beam 1051 in the Y direction.

[0045] It is necessary to ensure that the lock hook 1083 and the first lock buckle 1052 still have a certain overlap under working conditions such as impact vibration, assembly error, and long-term wear. Therefore, the overlap amount a is required to be greater than 0 mm, and the preferred value range is a≥3 mm.

[0046] In order to prevent the interference between the movement of the lock hook 1083 and the first lock buckle 1052 during the coupling stage, reasonable parameter configuration (preset movement law of the cam mechanism) can be used to avoid interference in the movement trajectories of the two, so as to achieve the coupling of the lock hook lock buckle constraint pair and the crossbeam plug pulling movement. Specifically, when the rotary drive rod 102 reaches the locking phase along the door closing direction, the rotation angle ψ of the cam 1081 reaches the ψz position. Ψz is the angle between the line connecting the rotation center of the lock hook 1083 to the rotation center of the cam 1081 and the line connecting the rotation center of the cam 1081 to the maximum lift point of the cam. The gap δ between the lock hook tip of the lock hook 1083 and the cylinder of the first lock buckle 1052 changes with the rotation of the rotary drive rod under different ψz values. According to Figure 6 It can be seen that when the value of ψz exceeds the specified range, for example, when ψz = 0, there is a gap δ < 0, indicating that interference will occur between the lock hook 1083 and the first lock buckle 1052. When ψz = -35°, the gap δ is close to 0. When -35° ≤ ψz ≤ -1°, δ > 0. Therefore, the preferred range of ψz is: -35° ≤ ψz ≤ -1° (ψ is positive counterclockwise). This avoids interference between the lock hook 1083 and the first lock buckle 1052 and achieves coupling between the lock hook and lock buckle constraint pair and the crossbeam plug pulling motion.

[0047] During operation, the rotary drive rod 102 rotates clockwise, and the cams 1081 at both ends of the rotary drive rod 102 rotate accordingly. The design of the cam 1081 enables its profile to push or pull the follower 1082. The follower 1082 swings according to the changes in the profile of the cam 1081, and the lock hook 1083 on it also swings accordingly. At the same time, the crossbeam 1051 performs a plug-pull motion. As the follower 1082 swings and the crossbeam 1051 plug-pull motion, the lock hook 1083 gradually approaches and eventually couples to the first lock buckle 1052 fixed to the crossbeam 1051. Because the lock hook 1083 and the first lock buckle 1052 are designed with an overlap, a secure connection between the two is ensured. When the lock hook 1083 is coupled to the first lock buckle 1052, the friction and mechanical bite force between the two work together to provide a strong restraining force. Because the force of the lock hook 1083 acts on its swing center and not on the transmission chain from the cam to the follower, the restraining reaction force at the end does not directly act on the rotary drive rod 102, thus preventing deformation of the rotary drive rod 102. Furthermore, the rotary drive rod 102 is prevented from being misaligned with the crossbeam due to force, thereby increasing the resistance to opening and closing the door, and the follower is prevented from being worn due to force, thereby reducing the stability and wear resistance of the system.

[0048] like Figure 4 and Figure 7 As shown, the vertical synchronization rod assembly 4 consists of a synchronization rod 401, an upper rotating arm 402, a connecting rod 403, etc. The upper part of the synchronization rod 401 is rotatably connected to the vehicle body, and the lower part is fixedly connected to the swing arm drive shaft 301 of the lower swing guide device 3. The upper rotating arm 402 is fixedly connected to the upper part of the synchronization rod 401 and has a hook-shaped portion at one end. The two ends of the connecting rod 403 are respectively rotatably connected with the upper rotating arm 402 and the crossbeam assembly 105.

[0049] Observation attachment Figure 4 From (a) to 4(c), when the door system is in the locking position, the movement of the crossbeam 105 drives the connecting rod 401 to rotate, thereby driving the rotation of the upper rotating arm 402 and the synchronization rod 401. When the door system is locked, the upper rotating arm 402 rotates into position, and its hook-shaped portion hooks onto the door leaf 3 from the inside, thereby restraining the upper portion of the door leaf from the rear stop.

[0050] like Figure 3 As shown, the lower swing guide device 3 is fixedly connected to the lower part of the vehicle body. The specific structure can be found in patent CN118008075A, a lower swing guide device.

[0051] like Figure 1 、 Figure 3 and Figure 6As shown, the door leaf 2 is fixedly connected to the door frame assembly 106, and a stop pin 201 is provided on the lower inner part of the door, and continuous peripheral sealing strips 202 are provided at the upper, lower and rear stops. The front stop is provided with a finger guard strip 203, and a second lock buckle 204 is provided in the middle of the rear stop; in addition to the installation anchor point, the peripheral sealing strip 202 includes an inner support arm 2021, an inwardly concave outer support arm 2022, an eight-shaped lip 2023 and a pressure balance hole 2024 located at the inner support arm 2021.

[0052] The peripheral sealing strip 202 of this embodiment is described below through a specific analysis, as follows: like Figure 3 and Figure 6 As shown, specifically, a rubber strip cavity is formed between the inner support arm 2021 and the outer support arm 2022. The lip 2023 is disposed at the intersection of the inner support arm 2021 and the outer support arm 2022, and the lip 2023 is cantilevered over the mounting anchor of the peripheral sealing strip 202. The pressure balance hole 2024 is disposed on the inner support arm 2021. The outer support arm 2022 is concave toward the rubber strip cavity and maintains this concave tendency under negative pressure conditions outside the vehicle. Furthermore, the peripheral sealing strip 202 also includes a leaning arm, one end of which is connected to the mounting anchor and the other end to the outer support arm 2022. The inner support arm 2021 has one end connected to the outer support arm 2022 and the other end connected to the mounting anchor. The distance from the intersection of the leaning arm and the outer support arm to the mounting anchor is greater than the distance from the mounting anchor to a perpendicular line between the lip 2023 and the outer side surface of the leaning arm.

[0053] Furthermore, the inner support arm 2021 is a long cantilever structure, with the wall thickness gradually decreasing from the mounting anchor point to the splayed lip 2023. This design results in a thicker wall near the fixed end (the mounting anchor point), providing sufficient strength and stability to withstand the significant stresses of the door closing and provide long-term fixed support. This variation in wall thickness allows for greater elastic deformation, allowing the sealing strip to more closely conform to the sealing surface under pressure. This allows the strip to better adapt to dynamic deformations during vehicle operation, maintaining a good seal.

[0054] The outer support arm 2022 is concave in shape and is easily deformed. In the length direction of the peripheral sealing strip 202, a number of pressure balancing holes 2024 are provided on the inner support arm 2021. The provision of multiple pressure balancing holes can be more evenly distributed along the length direction of the entire sealing strip, which helps to achieve rapid pressure balance at different positions. Especially when encountering rapid changes in pressure inside and outside the vehicle (such as entering and exiting a tunnel, or driving at high speed), it can effectively prevent local pressure accumulation, reduce uneven squeezing of the sealing strip, maintain the stability of the seal and smooth operation of the door. In addition, by dispersing the pressure, it avoids a single pressure balancing hole from taking on too much pressure regulation tasks, thereby reducing local stress concentration on the material of the peripheral sealing strip 202, helping to extend the service life of the strip and reduce maintenance costs.

[0055] The connection between the leaning arm and the outer support arm 2022 forms an intersection, and the distance from the intersection of the leaning arm and the outer support arm 2022 to the installation anchor point is greater than the distance from the installation anchor point to the vertical line of the splayed lip 2023 and the outer side surface of the leaning arm.

[0056] This design positions the intersection of the outer support arm 2022 and the leaning arm away from the mounting anchor point. This allows for more uniform compression of the seal formed by the splayed lip 2023 when the door is closed. The longer connection between the leaning arm and the outer support arm 2022 provides better mechanical support, increasing the overall rigidity and stability of the sealing strip under load.

[0057] Based on the above design, under negative pressure conditions, the rubber strip cavity expands directionally, the outer support arm always maintains an inward concave trend, and the intersection point of the inner and outer sealing lips forms a very small displacement. The inner sealing lip and the sealing surface are always in contact and extrusion. Therefore, even a small rubber strip compression Δs can ensure good dynamic sealing performance. When the vehicle is under positive pressure, the pressure difference between the inside and outside of the vehicle presses the outer sealing lip of the sealing part more reliably against the sealing surface, thus achieving effective sealing of the sealing strip under positive pressure conditions outside the vehicle; When closing the door, due to the existence of the rubber strip cavity and the easy deformation of the outer support arm, the gas in the rubber strip cavity enters the interior of the vehicle through the air pressure balance hole. Therefore, the rebound force of the sealing strip is small, and even a large rubber strip compression amount Δs will not affect the closing of the door.

[0058] In summary, the working process of this application is roughly as follows: When closing the door, (1) in the linear motion section, the rotating drive rod 102 drives the nut assembly 103 to move horizontally, thereby driving the door frame assembly 106 and the door leaf 2 to move horizontally in the X direction, and the beam assembly 105 has no Y direction movement.

[0059] (2) When the upper part of the door leaf 2 begins to enter the plug, the roller on the door frame assembly 106 is in the curved section of the upper slide 107. Under the constraint of the slide, the nut assembly 103 moves along the X direction under the drive of the rotating drive rod 102 and rotates, driving the crossbeam assembly 105 to move in the Y direction, thereby driving the lock 1052 to move, the connecting rod 403 to rotate, the upper rotating arm 402 and the synchronous rod 403 to rotate, and then the cam drive shaft in the lower swing guide device 3 begins to rotate, and the lower part of the door leaf 2 moves in the plug-in direction at nearly 35°; when the plug is pulled to the point where the peripheral sealing strip 202 and the sealing surface (the door sill 6 and the outer surface of the pressure strip 7 form a sealing surface) are in contact and squeezed, the outer support arm 2022 of the peripheral sealing strip 202 is easily deformed, and the gas enters the interior of the vehicle body through the air pressure balance hole 2024, and the strip has a small rebound force.

[0060] (3) When the door leaf 2 reaches the closed state, the middle crank slider mechanism forms an over-dead point state, the roller on the door frame assembly 106 is in the groove section of the upper slide 107, the swinging lock hook 1083 is coupled with the lock buckle 1052 on the beam 1051 to form an end constraint on the beam assembly 105 (the interaction force F1 between the two points to the swing center of the lock hook 1083), the hook-shaped part of the upper rotating arm 402 is coupled with the upper part of the rear stop of the door leaf 2 (the force F2 of the upper rotating arm 402 on the door leaf 2 is in line with the two axis connection line of the connecting rod 403), and the end of the beam assembly 105 has been reliably constrained, thereby A constraint is established at the upper part of the rear stop of the door leaf; the cam of the lower guide device 3 enters the locking section, the lower part of the rear stop of the door leaf is locked in the X and Y directions and the lower part of the door leaf is pressed in the X direction, and the stop pin 201 at the lower part of the front stop of the door leaf is coupled with the insert on the door sill 6 to form a stop pin insert pair to achieve Y-direction constraint; the middle constraint lock hook 5 is coupled with the lock buckle 204 on the door leaf 2, thereby forming a multi-point constraint system for the door system; at this time, the finger guard strips 203 of the left and right door leaves are in contact and squeezed with each other, and the eight-shaped lips 2023 of the peripheral sealing strip 202 are in contact and squeezed with the outer surface of the pressure strip 7 and the outer surface of the door sill, forming a seal around and in the middle of the door system.

[0061] Under the positive pressure condition outside the vehicle: the outer sealing lip of the splayed lip 2023 of the peripheral sealing strip 202 is pressed more reliably against the sealing surface under the action of air pressure, thereby achieving effective peripheral sealing under this condition.

[0062] Under the negative pressure condition outside the vehicle: the door system is in a multi-point constraint state, and the Y-direction displacement of each point of the door leaf 2 is small under the action of air pressure, and the pressure difference causes the gas inside the vehicle to enter the cavity of the peripheral sealing strip 202 through the pressure balance hole 2024, and the cavity of the peripheral sealing strip 202 expands directionally. The outer support arm 2022 always maintains an inward concave trend, and the displacement of the intersection point of the figure-shaped lip 2023 is very small. The inner sealing lip can always be in contact and extrusion with the sealing surface. The door system still has effective peripheral sealing under working conditions.

[0063] In summary, the invention of this application is: (1) The key technology of the present invention is that the door system has a multi-point restraint system with good rigidity, including a crossbeam multi-point restraint device, a vertical synchronization rod assembly, a lower swing guide device, a stop pin insert pair, a middle lock hook, etc.

[0064] Crossbeam multi-point restraint device: The cam is fixedly connected to the two ends of the rotating drive rod. When the rotating drive rod and the cam rotate together, the follower and the lock hook swing, and cooperate with the pulling movement of the crossbeam to couple the lock hook and the lock buckle to realize the restraint of the two ends of the crossbeam. Combined with the middle drive locking device, a crossbeam multi-point restraint device is formed, which transmits the driving power to the end and realizes the upper locking of the door system.

[0065] Vertical synchronization rod assembly: includes upper rotating arm, connecting rod and synchronization rod. The upper rotating arm is rotationally connected to the vehicle body. The two ends of the connecting rod are rotationally connected to the end of the crossbeam and the upper rotating arm (non-rotation center). The two ends of the synchronization rod are respectively fixed to the rotation center of the upper rotating arm and the drive shaft of the lower swing guide device. The Y-direction (vehicle width direction) movement of the crossbeam can drive the upper rotating arm to rotate. When the door is closed into place, the end of the crossbeam is reliably constrained by the lock hook, and the upper rotating arm that has rotated into place forms a reliable constraint on the upper part of the rear stop of the door leaf.

[0066] Lower swing guide device: The lower end of the synchronization rod is fixedly connected to the drive shaft of the lower swing guide device. When the crossbeam moves in the Y direction, the upper rotating arm drives the synchronization rod to rotate, thereby driving the lower swing guide device. The lower swing guide device adopts a double cam design, which has the functions of locking and pressing the lower rear stop of the door leaf in the X and Y directions and the X direction, thereby forming a reliable constraint at the lower rear stop of the door leaf.

[0067] Stop pin inlay pair: The lower swing guide device allows the lower part of the door leaf to be inserted at about 35 degrees. When the door is closed, the inlay on the threshold and the stop pin on the door leaf form a stop pin inlay pair, which forms a constraint on the lower front stop of the door leaf.

[0068] Middle lock hook: The middle lock hook fixedly connected to the vehicle body is coupled with the lock buckle in the middle of the rear stop of the door leaf, which can provide a reliable constraint on the middle of the rear stop of the door leaf.

[0069] (2) The second key technology created by the present invention is: using a peripheral sealing strip with a support arm that can maintain a moderate pressing force on the splayed lip, which forms a continuous seal at the upper, rear and lower parts of the door system; the peripheral sealing strip structure mainly includes an inner support arm, an inner concave outer support arm, an splayed lip cantilevered relative to the strip anchor point, and a pressure balancing hole located in the inner support arm, etc., wherein the inner support arm, the outer support arm and the installation anchor point form a cavity.

[0070] Through key technology one, the cam mechanism and the lock hook and lock buckle constraint pair form an end constraint device, and combined with the middle over-dead point locking device, a crossbeam multi-point constraint device of the crossbeam assembly is constructed; based on the crossbeam multi-point constraint device and the vertical synchronization rod assembly, the hook-shaped part of the upper rotating arm can reliably restrain the upper part of the rear stop of the door leaf; in addition to realizing X and Y-direction locking and X-direction compression of the lower part of the rear stop of the door leaf, the lower swing guide device can also allow the lower part of the door leaf to be inserted at about 35° so that the stop pin can form a constraint on the lower part of the front stop of the door leaf; combined with the mutual coupling effect of the constraint lock hook and the lock buckle in the middle of the rear stop, a reliable multi-point constraint system for the door system is constructed, and the door system has high bearing strength.

[0071] Through key technologies one and two, the door system is in a multi-point constraint state. Under static working conditions, the peripheral sealing strip is squeezed into contact with the sealing part, and the finger guard strips of the left and right door leaves are squeezed against each other, and the door system has good sealing performance; under positive pressure working conditions outside the vehicle, the outer sealing lip will be more reliably pressed against the sealing surface, realizing effective peripheral sealing under this working condition; under negative pressure working conditions outside the vehicle, the door system is in a multi-point constraint state, and the Y-direction displacement of each point of the door leaf is small under the action of air pressure. In addition, the pressure difference causes the gas inside the vehicle to enter the cavity of the peripheral sealing strip through the pressure balance hole, and the cavity expands directionally. The outer support arm always maintains an inward concave trend, and the displacement of the intersection point of the eight-shaped lip is very small. The inner sealing lip can always be in contact and squeezed with the sealing surface, so it still has effective peripheral sealing under negative pressure conditions. In summary, the reliable multi-point constraint of the door system combined with the design of the sealing strip makes the door system have good static and dynamic sealing performance.

[0072] Through the second key technology, the inner and outer support arms can maintain a moderate pressing force on the figure-eight lip. During the door closing process, the outer support arm of the peripheral sealing strip is prone to deformation, and the gas enters the interior of the vehicle through the air pressure balance hole. Therefore, the peripheral sealing strip has small rebound force and small closing resistance, which is conducive to ensuring the door opening and closing function of the door system.

[0073] Through key technology one, the multi-point restraint device of the beam avoids the use of additional transmission rods to achieve reliable end restraint of the beam. It has a simple structure and occupies little space. The door system avoids the use of side auxiliary locking devices, etc., further reducing the system complexity and weight.

[0074] The lower swing guide device is used to replace the conventional balance wheel and three-swing arm structure, which avoids the balance wheel forming a force-boosting lever in the door system, generating a large downward load and bringing a heavy load to the mechanism.

[0075] It is understood from common technical knowledge that the present application may be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the embodiments disclosed above are merely illustrative in all respects and are not intended to be exclusive. All modifications that come within the scope of this application or are equivalent to the scope of this application are intended to be included in this application.

Claims

1. A double-opening plug sliding door system, characterized in that: include: A load-bearing drive mechanism (1), the load-bearing drive mechanism (1) being fixed on the vehicle body, and an end restraining device (108) being rotatably mounted on the load-bearing drive mechanism (1); A pair of door leaves (2), the two door leaves (2) being movably arranged on the bearing drive mechanism (1), the two door leaves (2) having a first position in which the door leaves are closed and a second position in which the door leaves (2) are spread apart, and when the door leaves (2) are switched from the second position to the first position, the end restraining device (108) moves to limit the position of the door leaves (2); A middle restraining lock hook (5), the middle restraining lock hook (5) being fixed to the vehicle body, and when the door leaf (2) is placed in the first position, the middle restraining lock hook (5) is coupled to a second lock buckle (204) at the middle of the rear stop of the door leaf (2); A lower swing guide device (3), the lower swing guide device (3) being fixed to the bottom of the vehicle body, the lower swing guide device (3) comprising a swing arm drive shaft (301) and a stopper, a vertical synchronization rod assembly (4) being connected between the swing arm drive shaft (301) and the bearing drive mechanism (1), and when the door leaf (2) is switched from the second position to the first position, the bearing drive mechanism (1) drives the vertical synchronization rod assembly (4), thereby driving the swing arm drive shaft (301), so that the stopper can achieve movement guidance and position limiting of the lower part of the door leaf.

2. The double-opening plug sliding door system according to claim 1, characterized in that: The bearing drive mechanism (1) further comprises a frame (101), a rotating drive rod (102), a nut assembly (103), a transmission frame (104), a crossbeam (1051), and a door frame assembly (106); the frame (101) is fixedly connected to the vehicle body; the rotating drive rod (102) is rotationally connected to the frame (101); the nut assembly (103) is connected to the rotating drive rod (102) to form a screw-nut pair; the transmission frame (104) and the nut assembly (103) and the crossbeam (1051) are rotationally connected; the crossbeam (1051) is supported by the frame (101) and can be rotated on the frame (101) ) moves in the horizontal direction of the vehicle width, the door carrier assembly (106) can move in the length direction of the crossbeam (1051), and the door leaf (2) is fixed on the door carrier assembly (106); the nut assembly (103), the transmission frame (102) and the crossbeam (1051) constitute a crank slider mechanism; when approaching the first position, the rotating drive rod (102) drives the nut assembly (103) to rotate, thereby realizing the driving of the crossbeam (1051) in the horizontal direction of the vehicle width and the dead point locking; when the door leaf (2) is inserted into place, the end restraint device (108) realizes the restraint of the two ends of the crossbeam (1051).

3. The double-opening plug sliding door system according to claim 2, characterized in that: The end restraining device (108) is located at both ends of the crossbeam (1051), and the end restraining device (108) comprises a cam mechanism and a lock hook and lock buckle restraining pair; the cam mechanism comprises a cam (1081) and a follower (1082), the cam (1081) is fixed to the end of the rotating drive rod (102), and the follower (1082) is rotatably connected to the frame (101); the lock hook and lock buckle restraining pair comprises a lock hook (1083) and a first lock buckle (1052), the lock hook (1083) is fixed on the follower (1082), and the first lock buckle (1052) is fixed on the crossbeam (1051); The movements of the lock hook (1083) and the first lock buckle (1052) are coordinated with each other. When the rotary drive rod (102) and the cam (1081) rotate together, the follower (1082) and the lock hook (1083) swing together, cooperating with the plugging movement of the crossbeam (1051), so that the lock hook (1083) and the first lock buckle (1052) are coupled to realize the constraint of the two ends of the crossbeam (1051).

4. The double-opening plug sliding door system according to claim 3, characterized in that: When the lock hook (1083) is coupled to the first lock buckle (1052), the angle ψz between the line connecting the rotation center of the lock hook (1083) to the rotation center of the cam (1081) and the line connecting the rotation center of the cam (1081) to the maximum lift point of the cam (1081) is: -35°≤ψz≤-1°, and the lock hook (1083) and the first lock buckle (1052) have a certain overlap.

5. The double-opening sliding door system according to claim 1, characterized in that: The bearing drive mechanism (1) further comprises an upper slideway (107), wherein the upper slideway (107) is arranged on the frame (101), wherein the upper slideway (107) comprises a straight section, a curved section and a groove section, wherein the straight section, the curved section and the groove section are connected by arc transitions, wherein the groove section is perpendicular to the straight section, and wherein the groove section is used to form an X-direction constraint on the door leaf (2) in a closed state; A roller is fixed to the top of the door carrying frame assembly (106), and the roller is engaged in the upper slideway (107) to control the movement trajectory of the door leaf (2).

6. The double-opening sliding door system according to claim 1, characterized in that: The vertical synchronization rod assembly (4) comprises a synchronization rod (401), an upper rotating arm (402) and a connecting rod (403); the upper portion of the synchronization rod (401) is rotationally connected to the vehicle body; the upper rotating arm (402) is fixedly connected to the upper portion of the synchronization rod (401); both ends of the connecting rod (403) are rotationally connected to the upper rotating arm (402) and the crossbeam assembly (105); and the lower portion of the synchronization rod (401) is fixedly connected to the swing arm drive shaft (301).

7. The double-opening plug sliding door system according to claim 1, characterized in that: The front stop of the door leaf (2) is provided with a finger-protecting rubber strip (203); A continuous peripheral sealing strip (202) is provided at the upper section, the lower section and the rear section of the door leaf (2), and the peripheral sealing strip (202) comprises an eight-shaped lip (223); When the door leaf (2) is inserted into place, the finger-guard rubber strips (203) of the left and right door leaves (2) contact and squeeze each other, and the splayed lips (223) of the peripheral sealing rubber strip (202) contact and squeeze the sealing surface on the vehicle body. A door sill (6) and a pressure strip (7) are fixed on the vehicle body, and the outer surfaces of the door sill (6) and the pressure strip (7) form the sealing surface; It also includes a stop pin (201) fixed to the bottom of the door leaf (2), and when the two door leaves (2) are closed and acted upon by the lower swing guide device (3), the stop pin (201) is coupled with the insert block on the door sill (6) to limit the lower portion of the front stop of the door leaf (2).

8. The double-opening sliding door system according to claim 8, characterized in that: The peripheral sealing rubber strip (202) further comprises an installation anchor point, an inner support arm (2021), an outer support arm (2022) and a pressure balance hole (2024); A rubber strip cavity is formed between the inner support arm (2021) and the outer support arm (2022); the figure-eight lip (2023) is arranged at the intersection of the inner support arm (2021) and the outer support arm (2022), and the figure-eight lip (2023) is cantilevered and arranged at the installation anchor point of the peripheral sealing rubber strip (202); the pressure balance hole (2024) is arranged on the inner support arm (2021), and the outer support arm (2022) is concave toward the rubber strip cavity, and maintains the concave trend under negative pressure conditions outside the vehicle.

9. The double-opening plug sliding door system according to claim 8, characterized in that: The peripheral sealing strip (202) further comprises a leaning arm, one end of the leaning arm is connected to the installation anchor point, and the other end is connected to the outer support arm (2022); one end of the inner support arm (2021) is connected to the outer support arm (2022), and the other end is connected to the installation anchor point; The distance from the intersection of the leaning arm and the outer support arm (222) to the installation anchor point is greater than the distance from the installation anchor point to the vertical line between the splayed lip (223) and the outer side surface of the leaning arm.

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