A sliding plug door system with multi-point synchronous locking

Abstract

The present invention discloses a Sierra door system with multi-point synchronous locking, comprising a load-bearing drive assembly, a hinge structure, and a synchronization rod; the load-bearing drive assembly comprises left and right hangers, a motor assembly, a screw rod and a long guide column between the two hangers, a nut being provided on the outside of the screw rod, a slide cylinder being provided on the outside of the long guide column for fixing the door leaf, and the nut being connected to the slide cylinder. The motor drives the screw rod, which drives the slide cylinder through the nut to drive the door leaf to open and close; after the door is fully closed, the hinge structure is mechanically locked by rotating the screw rod past the dead point. The present invention realizes mechanical self-locking of the Sierra door through the hinge structure, thereby simplifying the locking structure; multiple locking points are formed by setting multiple hinges, thereby reducing the load of a single locking point and improving the overall load-bearing rigidity of the structure; the relative movement of the synchronization rod and the screw rod is utilized to control the simultaneous locking and unlocking of multiple locking points through a single power source, thereby improving the door locking reliability while simplifying the structure, reducing weight and cost, and having very good application prospects.

Description

Technical Field

[0001] The present invention relates to a plug-and-slide door system, in particular to a plug-and-slide door system with multi-point synchronous locking. Background Art

[0002] In the passenger vehicle door market, Sierra doors are gaining market share annually due to their safety, aesthetics, and comfort. Currently, some Sierra doors utilize active locking, requiring an independent power source, such as pneumatic or electric, to lock and unlock the door. For example, patent CN02144486.2 discloses a vehicle door locking device, and patent CN02108041.0 discloses a linearly actuated door locking device for transport vehicle door systems. These active locking structures are complex and costly in existing technology, and the external power source is prone to failure under harsh operating conditions, resulting in low reliability.

[0003] In the existing technology, more and more Sierra doors adopt passive locking forms, such as the electric Sierra door locking and unlocking mechanism disclosed in the invention patent with patent number CN103046827A, the electric door locking device disclosed in the invention patent with patent number CN102395740A, and an electric Sierra door with over-dead point locking disclosed in the utility model patent with patent number CN215443724U. This type of Sierra door achieves locking and unlocking through its own drive system and mechanical structure. The structure is simpler than the active locking structure and has higher reliability.

[0004] However, the passive locking mechanisms currently used in sliding plug doors often have relatively concentrated locking points, primarily located in the middle or at either end of the door drive mechanism. This creates a significant concentrated load on the locking components, resulting in poor overall drive mechanism rigidity and the door being susceptible to deformation when subjected to external forces. Prior art approaches typically employ the addition of auxiliary stoppers to increase overall door rigidity, but this increases the complexity and weight of the sliding plug door. Summary of the Invention

[0005] Purpose of the invention: The purpose of the present invention is to provide a sliding door system with multi-point synchronous locking, which has a simple and reliable locking structure and strong load-bearing rigidity.

[0006] Technical solution: The multi-point synchronous locking Sierra door system described in the present invention comprises a base plate with a left bracket and a right bracket fixed at both ends, and a guide slide; a load-bearing drive assembly and a synchronization rod are provided between the brackets on both sides of the base plate, and the load-bearing drive assembly comprises a left hanger, a right hanger, a screw rod, a long guide column and a motor assembly; the two hangers can move perpendicular to the base plate in the Y direction and are respectively arranged on the two brackets; the two ends of the screw rod are rotatably fixed to the hangers on both sides, driven by the motor assembly, and an external nut moving along the screw rod is provided; the two ends of the long guide column are fixed to the hangers on both sides, and an external slide cylinder fixedly connected to the door leaf is provided, and the slide cylinder is connected to the nut and is driven by the motor assembly Driven to move along the long guide column, the slide cylinder is fixed with a guide wheel that moves in the guide slideway; the two ends of the synchronization rod are rotatably fixed to the brackets on both sides, and the synchronization rod and the screw rod are connected by several hinge structures provided at both ends and the middle part, and the hinge structure includes a guide rod and two connecting rods hinged to the guide rod, and a locking tension spring for maintaining the lock is provided between the two ends of the guide rod and the two brackets; the first connecting rods at the two end portions of the hinge structure at both ends are fixedly connected to the synchronization rod, and the second connecting rods at both ends are rotatably connected to the screw rod; the second connecting rod in the middle of the hinge structure in the middle is fixedly connected to the nut and moves therewith; the screw rod, synchronization rod and guide rod are parallel to each other;

[0007] When the bearing drive assembly moves perpendicular to the baseplate, the screw rotates, causing the nut to drive the central hinge structure. Driven by the synchronization rod and guide rod, each hinge structure moves synchronously, and the angle between its two connecting rods changes simultaneously. When the synchronization rod, guide rod, and screw axis are coplanar, each hinge structure reaches its mechanical dead point. At this point, continued screw rotation, driven by the nut, simultaneously pushes each hinge structure past its mechanical dead point. To lock or open the Sierra door, the two brackets contact the first connecting rods at the ends of the two hinge structures, and the slide contacts the second connecting rod in the middle of the middle hinge structure, restricting the movement of each hinge structure and stopping it, thus locking the door. The motor assembly drives the screw in the opposite direction, causing the nut and screw to rotate together, driving the second connecting rod in the middle. Driven by the synchronization rod and guide rod, each hinge structure simultaneously pushes past its mechanical dead point, unlocking the door.

[0008] Preferably, the nut and the slide are connected via a transmission frame and a guide wheel, and the nut and the transmission frame are rotationally connected.

[0009] Preferably, a middle bracket is provided in the middle of the bottom plate.

[0010] Preferably, an unlocking assembly is fixed on the middle bracket, and the unlocking assembly includes a mounting plate, which is fixed on the middle bracket perpendicular to the axial direction of the screw rod; a central axis and a proximity switch that can move vertically are fixed on the mounting plate, and an unlocking bracket is rotatably provided on the central axis, and the unlocking bracket passes through the opening of the middle bracket in the vertical direction and is provided with an unlocking surface on the protruding part, and the unlocking bracket is provided with a movable triggering surface for triggering the proximity switch; an unlocking shaft that interacts with the unlocking bracket is provided on the middle first connecting rod close to the middle bracket, and when the load-bearing drive assembly is working normally to lock the vehicle door, the unlocking shaft pushes the unlocking bracket to rotate so that the triggering surface triggers the proximity switch and sends a signal that the vehicle door is locked in place; when the unlocking surface is pushed by external force in an emergency, the unlocking bracket rotates and pushes the unlocking shaft to make each hinge structure reverse past the dead point position to achieve emergency unlocking.

[0011] Preferably, a return spring is provided on the central shaft, one end of the return spring is fixedly connected to the mounting plate, and the other end is fixedly connected to the unlocking bracket. The return spring drives the unlocking bracket to rotate so that the trigger surface moves away from the proximity switch.

[0012] Preferably, a middle slide is fixedly provided under the middle bracket, and the motor assembly includes a middle bracket and a motor. The middle bracket is provided with a load-bearing wheel, which moves horizontally in the middle slide. The motor is fixed on one side of the middle bracket and drives the screw rod to rotate through a gear mechanism. The transmission ratio of the gear mechanism is adjustable; the screw rod passes through the middle bracket and is rotatably connected to the middle bracket. The long guide column passes through the middle bracket and is fixedly connected to the middle bracket.

[0013] Preferably, the guide slide includes a left guide slide between the left bracket and the middle bracket, and a right guide slide between the right bracket and the middle bracket, and both slides include a straight section and a plug section; a set of nuts and slide cylinders are provided on each side of the middle bracket, and the two nuts rotate in opposite directions.

[0014] Preferably, a guide rod is provided on each side of the middle bracket, and both ends of the guide rod are fixedly connected to the first connecting rod of each hinge structure.

[0015] Preferably, a fixed shaft is provided on the left bracket and the right bracket, and the fixed shaft is connected to the locking tension spring. The other end of the locking tension spring is rotated to connect to the hinge structure, which can maintain the locked state of the mechanism, and is used to prevent the hinge structure from being disengaged from the locked position when subjected to impact and vibration, thereby reducing the risk of accidental unlocking.

[0016] Preferably, the left and right bracket sides are respectively provided with a left moving slide and a right moving slide, and the left and right hanging bracket sides are provided with a pair of load-bearing wheels, which move horizontally along the Y direction in the moving slide; the bottom surface of the left bracket is provided with a limiting slide, and the bottom surface of the left hanging bracket is provided with a limiting wheel, which moves horizontally along the Y direction in the limiting slide.

[0017] Preferably, a square tube is provided between the left and right hangers, and both ends of the square tube are fixed to the hangers on both sides, so as to increase the overall rigidity and stability of the bearing drive assembly.

[0018] Working principle: The motor assembly drives the lead screw nut through a gear pair with an adjustable transmission ratio. The nut drives the slide and the door leaf fixed to it through the transmission frame to realize the opening and closing of the door. Multiple hinge structures are set between the synchronization rod and the lead screw. By utilizing the characteristics of the spiral transmission of the lead screw nut and the pull-type movement of the drive mechanism, the hinge is driven to actively pass the dead point by controlling the axial and circumferential movement of the nut relative to the lead screw, and the mechanical locking of the drive mechanism is realized by cooperating with the slide. When unlocking, the motor rotates in the opposite direction, driving the lead screw nut to rotate at the same time, and the second connecting rod of the middle hinge structure is used to drive the hinges at all locations to pass the mechanical dead point position at the same time to achieve unlocking. In an emergency, the unlocking assembly can be operated by external force to unlock the door.

[0019] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: 1. It adopts a hinge over-dead point locking and motor reverse self-unlocking scheme with a simple structure and high reliability; 2. Multiple hinges are locked and unlocked synchronously, and the concentrated load borne by a single locking point is small, which helps to improve the locking rigidity and reduce the weight and cost of the drive mechanism; 3. It adopts a central motor and gear pair transmission form, and the gear pair transmission ratio can be adjusted to adapt to the torque requirements of opening and closing the door, thereby improving the versatility of the drive motor and reducing the motor cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of Example 1 of the present invention;

[0021] Figure 2 This is a schematic structural diagram of a load-bearing drive assembly according to embodiment 1 of the present invention;

[0022] Figure 3 Schematic diagram of the hinge structure of Example 1 of the present invention;

[0023] Figure 4 This is a schematic diagram of the unlocking component structure of Example 1 of the present invention;

[0024] Figure 5 Schematic diagram of the left end structure (with the left bracket hidden) of Example 1 of the present invention;

[0025] Figure 6 This is a schematic diagram of the locked state of Example 1 of the present invention;

[0026] Figure 7 This is a schematic diagram of the guide slide structure of the present invention;

[0027] Figure 8 This is a schematic diagram of the dead point position of the hinge of the present invention;

[0028] Figure 9 This is a schematic structural diagram of Example 2 of the present invention;

[0029] Figure 10 This is a schematic structural diagram of a bearing drive assembly according to embodiment 2 of the present invention;

[0030] Figure 11 Schematic diagram of the hinge structure of Example 2 of the present invention;

[0031] Figure 12 This is a schematic diagram of the locked state of Example 2 of the present invention. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0033] Example 1

[0034] like Figure 1-6 As shown, a double-opening plug sliding door system, the bottom plate 1 is fixedly connected to the vehicle body, the left bracket 2, the right bracket 3 and the middle bracket 5 are all installed on the bottom plate 1; the left bracket 2 is provided with a left movable slide 21 on the side and a limiting slide 22 on the bottom, the right bracket 3 is provided with a right movable slide 31 on the side, and the middle bracket 5 is provided with a middle slide 51; the middle bracket 5 is provided with a left guide slide 41 and a right guide slide 42 on both sides. Figure 7 As shown, the slide structure is composed of a straight section 401 and a plug section 402. The two ends of the left guide slide 41 are respectively fixed on the left bracket 2 and the middle bracket 5, and the two ends of the right guide slide 42 are respectively fixed on the right bracket 3 and the middle bracket 5.

[0035] A synchronization rod 7 and a bearing drive assembly 6 are provided between the left and right brackets 2 and 3. The synchronization rod 7 is arranged parallel to the base plate 1, with its ends mounted on the left and right brackets 2 and 3, respectively, and can rotate only about its own axis. The bearing drive assembly 6 comprises a left bracket 61, a right bracket 62, a screw 64, a long guide post 65, a transmission structure 66, a square tube 68, and a motor assembly 67. The left and right brackets 61 and 62 are respectively mounted on the left and right brackets 2 and 3, and are each equipped with a pair of bearing wheels 63. The axes of the bearing wheels 63 are coplanar and move synchronously within the left and right movable slideways 21 and 31, respectively. A limiting shaft 611 is provided below the left bracket 61, and a limiting wheel 612 is mounted on the limiting shaft 611. The limiting wheel 612 cooperates with the limiting slideway 22 to limit the displacement of the bearing drive assembly 6 in the X direction. The screw 64 is mounted on the left and right brackets 61 and 62, with its ends mounted parallel to the synchronization rod 7, and can rotate about its own axis. Long guide post 65 is arranged parallel to screw rod 64, with its ends fixedly mounted on left and right hangers 61 and 62, respectively. Square tube 68 is fixedly connected to left and right hangers 61 and 62 at its ends, respectively, to increase the overall rigidity and stability of the load-carrying drive assembly 6. Motor assembly 67 includes a middle hanger 671, which is equipped with a load-bearing wheel 673 that moves within middle slideway 51. Motor 672 is fixedly mounted on middle hanger 671 and drives screw rod 64 for rotation via a gear transmission mechanism 674 with an adjustable transmission ratio. Screw rod 64 passes through middle hanger 671 and is rotationally connected thereto. Long guide post 65 passes through middle hanger 671 and is fixedly connected thereto. Square tube 68 is also fixedly connected to middle hanger 671. The load-carrying drive assembly 6 can only reciprocate in the Y direction under the constraints of the left moving slide 21, the right moving slide 31, the middle slide 51, and the limit slide 22. Its movement distance is limited by the guide slide 4. The left door leaf 11 and the right door leaf 12 are fixedly connected to the load-carrying drive assembly 6 and move with the load-carrying drive assembly 6.

[0036] The transmission structure 66 comprises a nut 6601, a slide 6602, and a guide wheel 6604. The nut 6601 is mounted on the outside of the screw rod 64 and moves in conjunction with it. The slide 6602 is mounted on the outside of the long guide column 65 and is fixedly connected to the door leaf, allowing only axial reciprocating movement along the long guide column 65. The nut 6601 and slide 6602 are connected by a transmission frame 6603 and move synchronously in the X direction. The nut 6601 can rotate relative to the transmission frame 6603, which is mounted on the slide 6602 via a transmission shaft 6605 and can only rotate around the transmission shaft 6605. The guide wheel 6604 is fixed to the slide 6602 and moves within the guide slide 4. A set of transmission structures 66 is provided on each side of the middle bracket 5. The rotation directions of the nuts 6601 of the two sets of transmission structures 66 are opposite. The slide 6602 is fixedly connected to the left door leaf 11 and the right door leaf 12 respectively, and the guide wheel 6604 moves in the left guide slide 41 and the right guide slide 42 respectively.

[0037] The bearing drive assembly 6 is connected to the synchronization rod 7 via a hinge structure 8. The hinge structure 8 includes hinge structures 81 at both ends and a hinge structure 82 in the middle to ensure the stability of its overall movement. The middle hinge structure 82 is divided into two groups, one on each side of the middle bracket 5. Each hinge structure 8 consists of two connecting rods and a guide rod 83. The two connecting rods are hinged to the guide rod 83. The guide rod 83 is divided into two and is arranged on both sides of the middle bracket 5 in parallel with the screw rod 64. The first connecting rod of each hinge structure 8 is fixedly connected to the synchronization rod 7 and rotates around its axis with the synchronization rod 7. The second connecting rods 812 at both ends of the hinge structure 81 are rotatably connected to the ends of the screw rod 64 and can only rotate relative to the screw rod. The second connecting rods 822 in the middle of the two groups of middle hinge structures 82 are fixedly connected to the nuts 6601 of the two groups of transmission structures 66 and move with them.

[0038] An unlocking assembly 9 is fixed to the middle bracket 5. This assembly includes a mounting plate 91, which is fixed to the middle bracket 5. Mounting plate 91 is equipped with a proximity switch 94 and a central shaft 92. Proximity switch 94 can be adjusted in the Z direction. Central shaft 92 is fixed to mounting plate 91, upon which is mounted a rotatable unlocking bracket 93. A return torsion spring 96 is interposed between the two, acting on unlocking bracket 93 to cause it to rotate about central shaft 92. An unlocking surface 97 is fixed to unlocking bracket 93 to withstand the unlocking force, and a triggering surface 95 on unlocking bracket 93 is used to trigger proximity switch 94. An unlocking shaft 98 is provided on the first connecting rod 821 in the middle of the hinge structure 82 on the right side of the middle bracket 5, which pushes the unlocking bracket 93 to trigger the proximity switch 94.

[0039] A fixed shaft 10 is mounted on the left bracket 2 and the right bracket 3 respectively. A locking tension spring 69 is provided between the fixed shaft 10 and the end of the guide rod 83 for locking and maintaining.

[0040] Plug door locking process:

[0041] When the door is open, the motor 672 rotates forward, driving the screw 64 through the gear transmission mechanism 674. The nuts 6601 on either side are restrained by the central second connecting rod 822 and cannot rotate. Driven by the screw 64, they can only move relative to it in the X direction. The nuts 6601 on either side, via the transmission frame 6603 and the transmission shaft 6605, respectively drive the slides 6602 on the long guide posts 65 toward the center. The slides 6602 then move the left and right door leaves 11 and 12 toward closing. At this point, the guide wheels 6604 move within the straight section 401 of the guide track 4.

[0042] When the guide wheel 6604 moves to the plug segment 402, it will perform a combined motion along the X and Y directions, and drive the bearing drive assembly 6 to move along the negative Y direction. The distance between the screw rod 64 and the synchronization rod 7 becomes larger. When the axes of the screw rod 64, the guide rod 83 and the synchronization rod 7 are coplanar, all the hinge structures 8 are at the mechanical dead point position at the same time, as shown in FIG. Figure 8 The bearing drive assembly 6 will stop moving in the negative direction Y, and the door will be in the fully closed state.

[0043] The motor 672 continues to rotate, driving the nuts 6601 on both sides via the screw 64. The central second connecting rod 822 rotates along with the nuts 6601. Under the action of the guide rod 83 and the synchronization rod 7, all hinge structures 8 will synchronously pass the dead center position. The distance between the screw 64 and the synchronization rod 7 will decrease, and the load-carrying drive assembly 6 will move in the positive direction Y. The central second connecting rod 822 will continue to rotate a certain angle and then contact the slide 6602. Simultaneously, the first connecting rods 811 on both ends will contact the left and right hangers 61 and 62, respectively. At this point, the central second connecting rod 822 stops rotating, the load-carrying drive assembly 6 stops moving, and the slides 6602 and guide wheels 6604 on both sides remain stationary under the restraint of the guide slide 4, and the door is locked.

[0044] When the door moves from the closed position to the locked position, the unlocking shaft 98 installed on the middle first connecting rod 821 drives the unlocking bracket 93 to rotate and triggers the proximity switch 94 to send a door locked position signal. After the door is locked, the locking spring 69 is in a tensioned state, which prevents the hinge structure 8 from crossing the dead point position in the reverse direction when the door is subjected to external force, thereby avoiding accidental unlocking and opening of the door. Figure 6 shown.

[0045] Plug door opening process:

[0046] The motor 672 rotates in the opposite direction, driving the screw 64 through the gear transmission structure 674. At this point, the nuts 6601 on both sides rotate along with the screw 64, driving the middle second link 822 of the central hinge structure 82. This, in turn, drives all first links synchronously past their dead center positions via the guide rod 83, unlocking the doors. During this process, the unlocking bracket 93, activated by the return torsion spring 96, rotates, moving the trigger surface 95 away from the proximity switch 94, which then signals the door unlock. The motor 672 continues to rotate, driving the left and right door leaves 11 and 12 to their fully opened positions.

[0047] Emergency unlocking process of sliding door:

[0048] When the vehicle door is in a locked state and cannot be electrically unlocked due to a fault, the unlocking surface 97 on the unlocking assembly 9 is pushed by external force, causing the unlocking bracket 93 to rotate around the central axis 92, driving the unlocking shaft 98 to move upward, and the unlocking shaft 98 drives the middle first connecting rod 821 of the middle hinge structure 82 to rotate. The middle first connecting rod 821 drives all the hinge structures 8 to synchronously cross the dead point position through the synchronization rod 7, thereby unlocking the vehicle door.

[0049] Example 2

[0050] like Figure 9-12 As shown, a single-opening plug sliding door system includes a left bracket 2, a right bracket 3, and a synchronization rod 7. The left bracket 2 and the right bracket 3 are fixedly connected to the vehicle body, and a guide slide 4 is provided between the left and right brackets 3. The two ends of the guide slide 4 are respectively fixed to the left bracket 2 and the right bracket 3; a left movable slide 21 is provided on the left bracket 2, and a right movable slide 31 is provided on the right bracket 3. The two ends of the synchronization rod 7 are respectively mounted on the left bracket 2 and the right bracket 3, and can only rotate about its own axis. A load-bearing drive assembly 6 is provided between the left bracket 2 and the right bracket 3.

[0051] like Figure 7 As shown, the guide slide 4 is divided into a straight section 401 and a plug section 402. The straight section 401 is arranged parallel to the long guide post 65, and the plug section 402 is composed of an arc and a straight line, one end of which is connected to the straight section 401, and the end point and the starting point are respectively a certain distance apart in the X and Y directions.

[0052] The load-carrying drive assembly 6 includes a left hanger 61, a right hanger 62, a screw 64, a long guide post 65, a transmission structure 66, and a motor assembly 67. The left and right hangers 61 and 62 are respectively mounted on two side brackets, each equipped with a pair of load-carrying wheels 63. The axes of the two pairs of load-carrying wheels are in the same plane and move within the left and right movable slideways 21 and 31, respectively. The screw 64 is mounted on both ends of the hangers and arranged parallel to the synchronization rod 7, and can only rotate around its own axis. The motor assembly 67 is mounted on the left hanger 61 and coaxially connected to the screw 64. The long guide post 65 is arranged parallel to the screw 64 and fixedly mounted on the left and right hangers 61 and 62 at both ends. The transmission structure 66 includes a nut 6601, a slide 6602, and a guide wheel 6604. Nut 6601 is mounted on the outside of screw rod 64 and moves in conjunction with it. Slide 6602 is mounted on the outside of long guide post 65 and is fixedly connected to the door leaf, allowing only axial reciprocating movement along the long guide post 65. Nut 6601 and slide 6602 are connected by a transmission frame 6603, allowing them to move synchronously in the X direction. Nut 6601 can rotate relative to transmission frame 6603, which is mounted to slide 6602 via a transmission shaft 6605 and can only rotate around transmission shaft 6605. Guide wheel 6604 is fixed to slide 6602 and moves within guide slide 4. The bearing drive assembly 6, constrained by the guide slide 4, left movable slide 21, and right movable slide 31, can only reciprocate within a certain range in the Y direction.

[0053] The bearing drive assembly 6 is connected to the synchronization rod 7 via a hinge structure 8 to ensure the stability of the overall movement. The hinge structure 8 includes hinge structures 81 at both ends and a hinge structure 82 in the middle. Each hinge structure 8 consists of two connecting rods and a guide rod 83. The two connecting rods are hinged to the guide rod 83, and the guide rod 83 is arranged parallel to the screw rod 64. The first connecting rods 811 at both ends of the hinge structure 81 are fixedly connected to the synchronization rod 7 and move with the synchronization rod 7. The second connecting rods 812 at both ends are rotatably connected to the ends of the screw rod 64 and can only rotate relative to the screw rod. The second connecting rod 822 in the middle of the hinge structure 82 is fixedly connected to the nut 6601 of the transmission structure 66 and moves therewith. The first connecting rod 821 in the middle is rotatably connected to the synchronization rod 7 and can move and rotate relative to it. Together with the second connecting rod 822 in the middle, it moves along the X direction with the nut 6601.

[0054] Plug door locking process:

[0055] The driving mechanism is in the door-opening state, and the motor drives the screw rod 64 to rotate in the positive direction. The nut 6601 cannot rotate due to the restriction of the middle second connecting rod 822 of the middle hinge structure 82. Under the drive of the screw rod 64, it can only move in the negative direction of X. The nut 6601 drives the slide 6602 to move in the negative direction of X on the long guide column 65 through the transmission frame 6603 and the transmission shaft 6605. At this time, the guide wheel 6604 rolls in the straight section of the guide slide 4. When the guide wheel 6604 moves to the plug section, it will perform a compound motion in the negative direction of X and the negative direction of Y, and drive the bearing drive assembly 6 to move in the negative direction of Y. The distance between the screw rod 64 and the synchronization rod 7 will increase. When the axes of the screw rod 64, the guide rod 83 and the synchronization rod 7 are coplanar, all the hinge structures 8 are in the mechanical dead point position at the same time, and the bearing drive assembly 6 will stop moving in the negative direction of Y. Figure 8 As shown. The motor continues to rotate in the forward direction, driving the nut 6681 to rotate through the screw 64, and the middle second link 822 of the middle hinge structure 82 rotates with the nut 6601, so that the middle hinge structure 82 passes the dead point position. At the same time, the middle second link 822 drives the hinge structures 81 at both ends to pass the dead point position at the same time through the guide rod 83. The distance between the screw 64 and the synchronization rod 7 will decrease, and the load-bearing drive assembly 6 will move in the positive direction Y. After the middle second link 822 of the middle hinge structure 82 continues to rotate a certain angle, it will contact the slide 6602. At the same time, when the first link 811 on both sides of the hinge structures 81 at both ends contact the left hanger 61 and the right hanger 62 respectively, the nut 6601 and the middle second link 822 will not be able to continue to rotate, and the load-bearing drive assembly 6 stops moving. At this time, the slide 6602 and the guide wheel 6604 remain stationary under the limit of the guide slide 4, and the drive mechanism is in a locked state, as shown in FIG. Figure 4 shown.

[0056] Plug door opening process:

[0057] The motor rotates in the reverse direction, driving the screw rod 64 and the nut 6601 to rotate together. The middle second connecting rod 822 of the middle hinge structure 82 rotates along with the nut 6601, causing the middle hinge structure 82 to reverse past the dead point. At the same time, the middle second connecting rod 822 drives the hinge structures 81 at both ends to synchronously pass the dead point through the guide rod 83, thereby unlocking the drive mechanism.

Claims

1. A sliding plug door system with multi-point synchronous locking, comprising a bottom plate (1) with a left bracket (2) and a right bracket (3) fixed at both ends, and a guide slide (4), characterized in that: A bearing drive assembly (6) and a synchronous rod (7) are provided between the brackets on both sides of the base plate (1), and the bearing drive assembly (6) includes a left hanging bracket (61), a right hanging bracket (62), a screw rod (64), a long guide column (65) and a motor assembly (67); the two hanging brackets can move along the Y direction and are respectively provided on the two brackets; the screw rod (64) is rotatably fixed to the hanging brackets on both sides at both ends and is driven by the motor assembly (67), and a nut (6601) is externally provided to cooperate with the screw rod; the long guide column (65) is fixed to the hanging brackets on both sides at both ends, and a slide cylinder (6602) is externally provided to be fixedly connected to the door leaf, the slide cylinder (6602) is connected to the nut (6601) and is driven by the nut to move along the long guide column (65), and a guide wheel (6601) that moves in the guide slideway (4) is fixed on the slide cylinder (6602). 604); the two ends of the synchronization rod (7) are rotatably fixed to the brackets on both sides, and the synchronization rod (7) is connected to the screw rod (64) through a plurality of hinge structures (8) provided at both ends and the middle part, and the hinge structure (8) includes a guide rod (83) and two connecting rods hinged to the guide rod (83); a locking tension spring (69) for maintaining the lock is provided between the two ends of the guide rod (83) and the two brackets; the first connecting rods (811) at both ends of the hinge structures (81) at both ends are fixedly connected to the synchronization rod (7), and the second connecting rods (812) at both ends are rotatably connected to the screw rod (64); the middle second connecting rod (822) of the middle hinge structure (82) is fixedly connected to the nut (6601) and moves therewith; the screw rod (64), the synchronization rod (7) and the guide rod (83) are parallel to each other; When the bearing drive assembly (6) moves perpendicularly to the bottom plate (1), the screw rod (64) rotates to cause the nut (6601) to drive the middle hinge structure (82) to move. Under the action of the synchronization rod (7) and the guide rod (83), each hinge structure (8) moves synchronously, and the angle between its two connecting rods changes together. When the axes of the synchronization rod (7), the guide rod (83) and the screw rod (64) are coplanar, each hinge structure (8) reaches the mechanical dead point position. At this time, the screw rod (64) continues to rotate, driving each hinge structure (8) through the nut (6601) to simultaneously cross the mechanical dead point position. When the two brackets contact the first connecting rods (811) at both ends of the hinge structures (81) at both ends and the slide (6602) contacts the middle second connecting rod (822) of the middle hinge structure (82), the movement of each hinge structure (8) is restricted and stops, thereby achieving door locking; the motor assembly (67) drives the screw rod (64) to rotate in the opposite direction, and the nut (6601) and the screw rod (64) rotate together, driving the middle second connecting rod (822) to rotate. Under the action of the synchronization rod (7) and the guide rod (83), each hinge structure (8) is synchronized to cross the mechanical dead point position, thereby achieving door unlocking.

2. A multi-point synchronous locking plug door system according to claim 1, characterized in that: The nut (6601) and the slide cylinder (6602) are connected via a transmission frame (6603) and a transmission shaft (6605), and the nut (6601) and the transmission frame (6603) are rotationally connected.

3. The multi-point synchronous locking plug door system according to claim 1, characterized in that: A middle bracket (5) is fixedly provided in the middle of the bottom plate (1).

4. A sliding plug door system with multi-point synchronous locking according to claim 3, characterized in that: An unlocking assembly (9) is fixedly provided on the middle bracket (5), and the unlocking assembly (9) includes a mounting plate (91), which is fixedly provided on the middle bracket (5) perpendicular to the screw rod axial direction; a central shaft (92) and a proximity switch (94) movable in a vertical direction are fixedly provided on the mounting plate (91), an unlocking bracket (93) is rotatably provided on the central shaft (92), the unlocking bracket (93) vertically passes through the opening of the middle bracket (5) and is provided with an unlocking surface (97) on the protruding portion, and the unlocking bracket (93) is provided with a movable protrusion for triggering the proximity switch (94) A trigger surface (95); an unlocking shaft (98) interacting with the unlocking bracket (93) is provided on the middle first connecting rod (821) near the middle bracket (5); when the bearing drive assembly (6) works normally to realize the door locking, the unlocking shaft (98) pushes the unlocking bracket (93) to rotate so that the trigger surface (95) triggers the proximity switch (94) and sends a door locked position signal; when the unlocking surface (97) is pushed by external force in an emergency, the unlocking bracket (93) rotates and pushes the unlocking shaft (98) so that each hinge structure (8) passes through the dead point position in the reverse direction to realize emergency unlocking.

5. The multi-point synchronous locking plug door system according to claim 4, characterized in that: A return spring (96) is provided outside the central shaft (92), one end of the return spring (96) is fixedly connected to the mounting plate (91), and the other end is fixedly connected to the unlocking bracket (93); the return spring (96) drives the unlocking bracket (93) to rotate, so that the trigger surface (95) is away from the proximity switch (94).

6. The multi-point synchronous locking plug door system according to claim 3, characterized in that: A middle slideway (51) is fixedly provided below the middle bracket (5); the motor assembly (67) comprises a middle hanger (671) and a motor (672); a load wheel (673) is mounted on the middle hanger (671); the load wheel (673) moves horizontally in the middle slideway (51); the motor (672) is fixed to one side of the middle hanger (671); the motor shaft passes through the middle hanger (671) and drives the screw rod (64) to rotate through a gear mechanism (674); the transmission ratio of the gear mechanism (674) is adjustable; the screw rod (64) passes through the middle hanger (671) and is rotatably connected to the middle hanger (671); the long guide column (65) passes through the middle hanger (671) and is fixedly connected to the middle hanger (671).

7. The multi-point synchronous locking plug door system according to claim 3, characterized in that: The guide slideway (4) comprises a left guide slideway (41) between the left bracket (2) and the middle bracket (5), and a right guide slideway (42) between the right bracket (3) and the middle bracket (5), and both slideways comprise a straight section (401) and a plug section (402); a set of nuts (6601), a slide cylinder (6602) and a guide wheel (6604) are provided on both sides of the middle bracket (5), and the two nuts rotate in opposite directions.

8. The multi-point synchronous locking plug door system according to claim 4, characterized in that: A guide rod (83) is provided on each side of the middle bracket (5), and both ends of the guide rod (83) are fixedly connected to the first connecting rod of each hinge structure (8).

9. The multi-point synchronous locking plug door system according to claim 1, characterized in that: The left bracket (2) and the right bracket (3) are provided with a fixed shaft (10), the fixed shaft (10) is connected to the locking tension spring (69), and the other end of the locking tension spring (69) is rotatably connected to the guide rod (83).

10. The multi-point synchronous locking plug door system according to claim 1, characterized in that: The sides of the two brackets are respectively provided with a left movable slideway (21) and a right movable slideway (31); the sides of the two hanging brackets are each provided with a pair of bearing wheels (63); the pair of bearing wheels (63) move horizontally along the Y direction in the movable slideway; the bottom surface of the left bracket (2) is provided with a limiting slideway (22); the bottom surface of the left hanging bracket (61) is provided with a limiting wheel (612); the limiting wheel (612) moves horizontally along the Y direction in the limiting slideway (22).

11. The multi-point synchronous locking plug door system according to claim 1, characterized in that: A square tube (68) is provided between the left hanging rack (61) and the right hanging rack (62). Both ends of the square tube (68) are fixed to the hanging racks on both sides, and the middle part is fixedly connected to the middle hanging rack (671).

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