A double-opening plug and locking mechanism and a plug door using the same

Abstract

The present invention discloses a double-opening and closing mechanism and a sliding door applying the same, which comprises a frame, a lead screw assembly, a transverse and longitudinal translation assembly, two connecting rods, a left door carrier and a right door carrier. The frame includes a left sliding track and a right sliding track; the two connecting rods are symmetrically distributed, and one ends of the two connecting rods are rotatably connected to the lead screw assembly, and the other ends of the two connecting rods are rotatably connected to the transverse and longitudinal translation assembly; the left door carrier and the right door carrier are arranged in a mirror image, and are both fixedly connected to the transverse and longitudinal translation assembly, and the left door carrier is in rolling connection with the left sliding track, and the right door carrier is in rolling connection with the right sliding track. The present invention has the advantages of simple structure, high reliability, stable operation, low noise, high conversion rate of the pulling force of the plug, high transmission efficiency of the mechanism and wide application range.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicles, and more specifically, to a double-opening plug and lock mechanism and a plug door using the same. Background Art

[0002] The existing plug and lock mechanisms used in plug doors mainly include the following: 1. Driven by two motors respectively, and the plug movement is completed through electric control; 2. Driven by a single motor, a screw is used to drive a screw rod, and a nut assembly arranged on the screw rod is driven to perform reciprocating movement, and then the door leaf connected to the nut assembly is driven, and an electromagnetic lock is used to lock the nut assembly to realize the door locking function; 3. Driven by a single motor, a nut assembly is driven to realize the plug movement through a specially designed lead screw. The lead screw realizes passive locking in place through a non-threaded tooth surface on the lead screw. The structure is simple.

[0003] However, for the first method, the electric control system is complex, the cost is high, and the reliability is not high; for the second method, the electromagnetic lock must be powered on at all times to ensure the stability of door locking, the structure is complex, and the reliability is not high; for the third method, the lead screw is not a traditional thread, and special processing and customization are required, and the manufacturing cost is high. Moreover, in order to achieve passive locking, the nut assembly needs to be in contact with the lead screw in both the threaded section and the straight section. In this way, the lead screw and the nut are no longer a traditional screw drive, but a cam drive. The nut assembly and the lead screw are a high-pair drive. This drive is prone to wear and generates relatively large noise. In addition, the plug door force of this method is small, and an auxiliary device needs to be designed to rotate the nut assembly by a certain angle to achieve passive locking.

[0004] Therefore, it is an urgent problem for those skilled in the art to provide a double-opening plug and lock mechanism with stable and reliable operation and a plug door using the same. Summary of the Invention

[0005] In view of this, the present invention provides a double-opening plug and lock mechanism and a plug door using the same to solve the technical problems mentioned in the above background art.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A double-opening plug and lock mechanism includes:

[0008] A frame, the frame comprising a connecting plate, a left longitudinal rail seat, a right longitudinal rail seat, a central longitudinal rail seat, a left Serra slide and a right Serra slide, the left longitudinal rail seat and the right longitudinal rail seat are respectively fixed on both sides of the same plane of the connecting plate, the central longitudinal rail seat is fixed on the connecting plate and is located between the left longitudinal rail seat and the right longitudinal rail seat; the left Serra slide is fixed on the connecting plate near the bottom and is located between the left longitudinal rail seat and the central longitudinal rail seat, and the right Serra slide is fixed on the connecting plate near the bottom and is located between the right longitudinal rail seat and the central longitudinal rail seat;

[0009] A lead screw assembly, the lead screw assembly being installed between the left longitudinal rail seat and the right longitudinal rail seat and passing through the central longitudinal rail seat;

[0010] A transverse and longitudinal translation assembly, wherein the transverse and longitudinal translation assembly is installed at the lower part of the frame and is slidably connected to the frame;

[0011] Two connecting rods, the two connecting rods are symmetrically distributed, one end of the two connecting rods is rotatably connected to the screw assembly, and the other end of the two connecting rods is rotatably connected to the transverse and longitudinal translation assembly;

[0012] A left-carrying portal frame and a right-carrying portal frame, wherein the left-carrying portal frame and the right-carrying portal frame are arranged in a mirror-image manner and are both fixedly connected to the transverse and longitudinal translation components, and wherein the left-carrying portal frame is rollingly connected to the left Sierra slide, and the right-carrying portal frame is rollingly connected to the right Sierra slide.

[0013] By adopting the above scheme, the beneficial effects of the present invention are:

[0014] The screw assembly and the lateral and longitudinal translation assemblies are connected by connecting rod transmission. On the one hand, it avoids the need for special customization of the screw assembly and the formation of high-pair contact, and can use the existing screw structure, which has smoother operation, lower noise and longer life; on the other hand, it realizes passive locking, simple and reliable structure, low manufacturing cost and high system integration; finally, the plug tension conversion rate is improved and the transmission efficiency is high.

[0015] Furthermore, the screw assembly includes a bidirectional screw, a left nut, a right nut and two nut seats, the middle portion of the bidirectional screw is rotatably connected to the central longitudinal rail seat, and the two ends of the bidirectional screw are respectively rotatably connected to the left longitudinal rail seat and the right longitudinal rail seat; the left nut and the right nut are arranged in a mirror image and are respectively located on both sides of the central longitudinal rail seat, wherein the left nut is helically connected to the left portion of the bidirectional screw, and the right nut is helically connected to the right portion of the bidirectional screw, and the left nut and the right nut are respectively opposite to the directions of the helically transmitted bidirectional screw; the nut seat located on the left side is sleeved on the left nut and fixedly connected thereto, and the nut seat located on the right side is sleeved on the right nut and fixedly connected thereto.

[0016] Furthermore, the horizontal and vertical translation components include a left longitudinal rail, a left cross-rail seat, a central longitudinal rail, a central cross-rail seat, a right longitudinal rail, a right cross-rail seat, a cross-rail, a left sliding seat, and a right sliding seat. The left cross-rail seat, the central cross-rail seat, and the right cross-rail seat have the same structure. The left longitudinal rail is installed in the left longitudinal rail seat. The left cross-rail seat is sleeved on the left longitudinal rail and is slidably connected thereto. The central longitudinal rail is installed in the central longitudinal rail seat. The central cross-rail seat is sleeved on the central longitudinal rail and is slidably connected thereto. The right longitudinal rail is installed in the right longitudinal rail seat. The right cross-rail seat is sleeved on the right longitudinal rail and is slidably connected thereto. Both ends of the cross-rail are fixedly connected to the left cross-rail seat and the right cross-rail seat respectively, and the middle of the cross-rail is fixed in the central cross-rail seat. The left sliding seat and the right sliding seat are arranged mirror-symmetrically on both sides of the central cross-rail seat. The left sliding seat is sleeved on the left part of the cross-rail and is slidably connected thereto. The right sliding seat is sleeved on the right part of the cross-rail and is slidably connected thereto. The left door-carrying frame is fixedly connected to the left sliding seat, and the right door-carrying frame is fixedly connected to the right sliding seat. One ends of the two link rods are respectively rotatably connected to the two nut seats, and the other ends of the two link rods are respectively rotatably connected to the left sliding seat and the right sliding seat through a second shaft. When the left nut and the right nut move towards the middle and contact the mechanical limit installed on the central longitudinal rail seat, the included angles between the two link rods and the cross-rail are equal and both are greater than or equal to 90°.

[0017] Furthermore, the left door-carrying frame and the right door-carrying frame are both installed with second pulleys through a third shaft, and the two second pulleys are respectively fitted and installed in the left plug-in slideway and the right plug-in slideway.

[0018] Furthermore, a double plug-in and locking mechanism further includes a reinforcing column, a gland, a leaf spring, and two first pulleys. The reinforcing column is sleeved in the central longitudinal rail seat, and the top end of the reinforcing column extends out of the central longitudinal rail seat. The central longitudinal rail is sleeved on the reinforcing column, and both ends thereof are respectively abutted against the central longitudinal rail seat. The gland is threadedly connected to the extending end of the reinforcing column. The leaf spring is fixed between the gland and the central longitudinal rail seat. The two first pulleys are respectively installed on the left sliding seat and the right sliding seat through a first shaft, and respectively correspond to the concave surfaces at both ends of the leaf spring after the door is closed.

[0019] The beneficial effect of adopting the above further technical solution is that when the nut is translated to contact the central longitudinal rail seat, the first pulley contacts the leaf spring and deforms the leaf spring, thereby generating a locking and holding force on the sliding seat at this position and increasing the reliability of locking.

[0020] Further, it further includes a driving motor, a motor adapter seat and a coupling. The driving motor is fixed on the right longitudinal rail seat through the motor adapter seat; one end of the output shaft of the driving motor is connected to one end of the bidirectional lead screw through the coupling.

[0021] The beneficial effect of adopting the above further technical solution is that, driven by the driving motor, the two door carriers move in opposite directions, thereby realizing the movement of opening and closing the door.

[0022] A plug door includes a left door body, a right door body and the above-mentioned double-opening plug and locking mechanism. The left door body is fixed on the left door carrier, and the right door body is fixed on the right door carrier.

[0023] By adopting the above solutions, the beneficial effects of the present invention are:

[0024] It is convenient to use and operates stably and reliably. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0026] Figure 1 The drawing is the front view of a double-opening plug and locking mechanism provided by the present invention;

[0027] Figure 2 The drawing is the structural schematic diagram of a double-opening plug and locking mechanism provided by the present invention in the locked state;

[0028] Figure 3 The drawing is the three-dimensional structural schematic diagram of a double-opening plug and locking mechanism provided by the present invention in the non-locked state

[0029] Figure 4 The drawing is Figure 1 the sectional view taken along line A-A in

[0030] Figure 5 The drawing is Figure 1 the sectional view taken along line B-B in

[0031] Figure 6 The drawing is Figure 1 the sectional view taken along line C-C in

[0032] Figure 7 The drawing is Figure 1 the sectional view taken along line D-D in

[0033] Figure 8 The drawing isFigure 1 Cross-section view along E-E Detailed implementation manners

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. In particular, without changing the two main factors of the main body of the present invention: the arc transition section is in the shape of a reverse arc curve and the transition between the straight line and the arc structure, it should be within the content disclosed by the present invention.

[0035] As Figure 1-8 shown, the embodiments of the present invention disclose a double-opening plug pull and locking mechanism, including:

[0036] A frame, the frame includes a connecting plate 4, a left longitudinal rail seat 15-1, a right longitudinal rail seat 15, a central longitudinal rail seat 1, a left plug pull slideway 13-1 and a right plug pull slideway 13. The left longitudinal rail seat 15-1 and the right longitudinal rail seat 15 are respectively fixed on both sides of the same plane of the connecting plate 4. The central longitudinal rail seat 1 is fixed on the connecting plate 4 and is located between the left longitudinal rail seat 15-1 and the right longitudinal rail seat 15. The left plug pull slideway 13-1 is fixed at a position close to the bottom of the connecting plate 4 and is located between the left longitudinal rail seat 15-1 and the central longitudinal rail seat 1. The right plug pull slideway 13 is fixed at a position close to the bottom of the connecting plate 4 and is located between the right longitudinal rail seat 15 and the central longitudinal rail seat 1;

[0037] A lead screw assembly, the lead screw assembly is installed between the left longitudinal rail seat 15-1 and the right longitudinal rail seat 15 and penetrates through the central longitudinal rail seat 1;

[0038] A transverse and longitudinal translation assembly, the transverse and longitudinal translation assembly is installed at the lower part of the frame and is slidably connected to the frame;

[0039] Two connecting rods 9, the two connecting rods 9 are symmetrically distributed, and one end of each of the two connecting rods 9 is rotatably connected to the lead screw assembly, and the other end of each of the two connecting rods 9 is rotatably connected to the transverse and longitudinal translation assembly;

[0040] A left door-carrying frame 19-1 and a right door-carrying frame 19, the left door-carrying frame 19-1 and the right door-carrying frame 19 are arranged in a mirror image, and are both fixedly connected to the transverse and longitudinal translation assembly. Among them, the left door-carrying frame 19-1 is in rolling connection with the left plug pull slideway 13-1, and the right door-carrying frame 19 is in rolling connection with the right plug pull slideway 13.

[0041] The lead screw assembly of the present invention is connected to the transverse and longitudinal translation assemblies through link transmission. On the one hand, it avoids the need for special customization of the lead screw assembly and high - pair contact, and the existing lead screw structure can be used, resulting in smoother operation, lower noise, and longer service life. On the other hand, it realizes passive locking, with a simple and reliable structure, low manufacturing cost, and high system integration. Finally, it improves the conversion rate of plug pulling force and has high transmission efficiency.

[0042] Specifically, the lead screw assembly includes a bidirectional lead screw 5, a left nut 10 - 1, a right nut 10, and two nut seats 11. The middle of the bidirectional lead screw 5 is rotatably connected to the central longitudinal rail seat 1, and the two ends of the bidirectional lead screw 5 are respectively rotatably connected to the left longitudinal rail seat 15 - 1 and the right longitudinal rail seat 15. The left nut 10 - 1 and the right nut 10 are arranged in a mirror image and are respectively located on both sides of the central longitudinal rail seat 1. Among them, the left nut 10 - 1 is in screw - drive connection with the left part of the bidirectional lead screw 5, the right nut 10 is in screw - drive connection with the right part of the bidirectional lead screw 5, and the directions of the left nut 10 - 1 and the right nut 10 in screw - drive connection with the bidirectional lead screw are opposite. The nut seat 11 on the left side is sleeved on the left nut 10 - 1 and fixedly connected thereto, and the nut seat 11 on the right side is sleeved on the right nut 10 and fixedly connected thereto.

[0043] Specifically, the transverse and longitudinal translation assemblies include a left longitudinal rail 20 - 1, a left cross - rail seat 21 - 1, a central longitudinal rail 25, a central cross - rail seat 21, a right longitudinal rail 20, a right cross - rail seat 21 - 2, a cross - rail 14, a left sliding seat 12 - 1, and a right sliding seat 12. The left cross - rail seat 21 - 1, the central cross - rail seat 21, and the right cross - rail seat 21 - 2 have the same structure. The left longitudinal rail 20 - 1 is installed in the left longitudinal rail seat 15 - 1. The left cross - rail seat 21 - 1 is sleeved on the left longitudinal rail 20 - 1 and is slidably connected thereto. The central longitudinal rail 25 is installed in the central longitudinal rail seat 1. The central cross - rail seat 21 is sleeved on the central longitudinal rail 25 and is slidably connected thereto. The right longitudinal rail 20 is installed in the right longitudinal rail seat 15. The right cross - rail seat 21 - 2 is sleeved on the right longitudinal rail 20 and is slidably connected thereto. The two ends of the cross - rail 14 are respectively fixedly connected to the left cross - rail seat 21 - 1 and the right cross - rail seat 21 - 2, and the middle of the cross - rail 14 is fixed in the central cross - rail seat 21. The left sliding seat 12 - 1 and the right sliding seat 12 are arranged in a mirror image on both sides of the central cross - rail seat 21. The left sliding seat 12 - 1 is sleeved on the left part of the cross - rail 14 and is slidably connected thereto. The right sliding seat 12 is sleeved on the right part of the cross - rail 14 and is slidably connected thereto. The left door - carrying frame 19 - 1 is fixedly connected to the left sliding seat 12 - 1, and the right door - carrying frame 19 is fixedly connected to the right sliding seat 12. One ends of the two link rods 9 are respectively rotatably connected to the two nut seats 11, and the other ends of the two link rods 9 are respectively rotatably connected to the left sliding seat 12 - 1 and the right sliding seat 12 through the second shaft 8. When the left nut 10 - 1 and the right nut 10 move towards the middle and contact the mechanical limit installed on the central longitudinal rail seat 1, the included angles between the two link rods 9 and the cross - rail 14 are equal and both are greater than or equal to 90°.

[0044] Specifically, the left carrying gantry 19-1 and the right carrying gantry 19 are both equipped with second pulleys 23 through the third shaft 24, and the two second pulleys 23 are respectively fitted and installed in the left sash slideway 13-1 and the right sash slideway 13.

[0045] Specifically, a double-opening sash and locking mechanism further includes a reinforcing column 22, a gland 2, a leaf spring 3 and two first pulleys 6. The reinforcing column 22 is sleeved in the central longitudinal rail seat 1, and the top end of the reinforcing column 22 extends out of the central longitudinal rail seat 1; the central longitudinal rail 25 is sleeved on the reinforcing column 22, and its two ends are respectively abutted against the central longitudinal rail seat 1; the gland 2 is threadedly connected to the extended end of the reinforcing column 22; the leaf spring 3 is fixed between the gland 2 and the central longitudinal rail seat 1; the two first pulleys 6 are respectively installed on the left sliding seat 12-1 and the right sliding seat 12 through the first shaft 7, and respectively correspond to the concave surfaces at both ends of the leaf spring 3 after the door is closed. Thus, when the nut is translated to contact the central longitudinal rail seat, the first pulley contacts the leaf spring and causes the leaf spring to deform, thereby generating a locking and holding force on the sliding seat at this position and increasing the reliability of locking.

[0046] Specifically, it further includes a driving motor 18, a motor adapter seat 16 and a coupling 17. The driving motor 18 is fixed on the right longitudinal rail seat 15 through the motor adapter seat 16; the output shaft of the driving motor 18 is connected to one end of the bidirectional lead screw 5 through the coupling 17.

[0047] An embodiment of the present invention also discloses a sash door, which includes a left door body, a right door body and a double-opening sash and locking mechanism according to any one of claims 1-6. The left door body is fixed on the left carrying gantry 19-1, and the right door body is fixed on the right carrying gantry 19. The present invention is convenient to use and operates stably and reliably.

[0048] The working principle of the present invention:

[0049] The driving motor 18 rotates to drive the bidirectional lead screw 5 to rotate, and drives the left nut 10-1 and the right nut 10 to move along the axial direction of the bidirectional lead screw 5 and in opposite directions, and move toward the center. The left nut 10-1 drives the connecting rod 9 through the nut seat 11 to drive the sliding seat 12 to move, that is, the nut seat 11 and the sliding seat 12 are connected by the connecting rod 9, and the right nut 10 drives the connecting rod 9 through the nut seat 11 to drive the sliding seat 12 to move. The left carrying door frame 19-1 and the right carrying door frame 19 are respectively fixedly connected to the corresponding sliding seat 12, and the left carrying door frame 19-1 and the right carrying door frame 19 act on the second pulley 23 respectively. They roll in the left Sela slide 13-1 and the right Sela slide 13 respectively, that is, they form a spatial cam motion pair. When they are close to the center longitudinal rail seat 1, under the limitation and guidance of the trajectories of the left Sela slide 13-1 and the right Sela slide 13 (calculated by the degrees of freedom, the number of degrees of freedom of the Sela and locking door mechanism is equal to the number of power sources, which is a fixed trajectory motion), the left cross rail seat 21-1, the center cross rail seat 21 and the right cross rail seat 21-2 move longitudinally with the cross rail 14 along the left longitudinal rail 20-1 and the right longitudinal rail 20. At this time, the angles between the two connecting rods 9 and the sliding directions of the corresponding sliding seats 12 become larger. When the left nut 10-1 and the right nut 10 are in mechanical limit contact with the center longitudinal rail seat 1 respectively, the drive motor 18 stops rotating (of course, in order to improve the level of intelligent automation, sensors are installed on both sides of the center longitudinal rail seat 1. Once the contact with the left nut 10-1 and the right nut 10 is detected, the information is transmitted to the controller, thereby controlling the drive motor 18 to stop rotating). At this time, the angle between the two connecting rods 9 and the sliding direction of the corresponding sliding seat 12 is greater than or equal to 90 degrees, and a horizontal component force will be generated. This force will force the left nut 10-1 and the right nut 10 to be in closer contact with the center longitudinal rail seat 1 respectively, that is, the more it opens, the tighter it is, thus forming a dead point connecting rod transmission, realizing passive locking, and similarly, passive locking will also be realized on the other side. It is worth mentioning that in actual products, the sealing force of the Sierra door strip, the leaning force of the passenger and the auxiliary elastic structure can all achieve this locking preload. Note that the structure has a rebound force trigger design. When the left nut 10-1 and the right nut 10 respectively contact the mechanical limit on the central longitudinal rail seat 1, the first pulley 6 contacts the leaf spring 3 and deforms it, thereby generating a rebound locking force.

[0050] In the above process, the sliding direction angle between the connecting rod 9 and the sliding seat 12 is large when the door is closed, while the angle is small during the horizontal movement. Through force decomposition analysis, no matter in the door movement or the horizontal movement, the transmission force of the left nut 10-1 and the right nut 10 is converted into the plug pulling force at a very high ratio, and the transmission efficiency is very high.

[0051] In the present specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the embodiments can be referred to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description in the method section.

[0052] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double-opening plug and locking mechanism, characterized in that, Comprising: A frame, the frame includes a connecting plate (4), a left longitudinal rail seat (15-1), a right longitudinal rail seat (15), a central longitudinal rail seat (1), a left sash slideway (13-1) and a right sash slideway (13). The left longitudinal rail seat (15-1) and the right longitudinal rail seat (15) are respectively fixed on both sides of the same plane of the connecting plate (4), and the central longitudinal rail seat (1) is fixed on the connecting plate (4) and located between the left longitudinal rail seat (15-1) and the right longitudinal rail seat (15); the left sash slideway (13-1) is fixed at a position near the bottom of the connecting plate (4) and located between the left longitudinal rail seat (15-1) and the central longitudinal rail seat (1), and the right sash slideway (13) is fixed at a position near the bottom of the connecting plate (4) and located between the right longitudinal rail seat (15) and the central longitudinal rail seat (1); A lead screw assembly, the lead screw assembly is installed between the left longitudinal rail seat (15-1) and the right longitudinal rail seat (15), and penetrates through the central longitudinal rail seat (1); A transverse and longitudinal translation assembly, the transverse and longitudinal translation assembly is installed at the lower part of the frame and is slidably connected to the frame; Two connecting rods (9), the two connecting rods (9) are symmetrically distributed, and one end of each of the two connecting rods (9) is rotatably connected to the lead screw assembly, and the other end of each of the two connecting rods (9) is rotatably connected to the transverse and longitudinal translation assembly; when the lead screw assembly moves towards the middle and contacts the mechanical limit, the angles between the two connecting rods (9) and the cross rail (14) are equal and both are greater than or equal to 90°; A left door-carrying frame (19-1) and a right door-carrying frame (19), the left door-carrying frame (19-1) and the right door-carrying frame (19) are arranged in a mirror image, and are both fixedly connected to the transverse and longitudinal translation assembly, and the left door-carrying frame (19-1) is in rolling connection with the left sash slideway (13-1), and the right door-carrying frame (19) is in rolling connection with the right sash slideway (13); Both the left door-carrying frame (19-1) and the right door-carrying frame (19) are installed with second pulleys (23) through a third shaft (24), and the two second pulleys (23) are respectively fitted and installed in the left sash slideway (13-1) and the right sash slideway (13); It further includes a reinforcing column (22), a gland (2), a leaf spring (3) and two first pulleys (6). The reinforcing column (22) is sleeved in the central longitudinal rail seat (1), and the top end of the reinforcing column (22) extends out of the central longitudinal rail seat (1); the central longitudinal rail (25) is sleeved on the reinforcing column (22), and its two ends are respectively abutted against the central longitudinal rail seat (1); the gland (2) is threadedly connected to the extending end of the reinforcing column (22); the leaf spring (3) is fixed between the gland (2) and the central longitudinal rail seat (1); the two first pulleys (6) are respectively installed on a left sliding seat (12-1) and a right sliding seat (12) through a first shaft (7), and respectively correspond to the concave surfaces at both ends of the leaf spring (3) after the door is closed.

2. The double plug pull and lock mechanism according to claim 1, characterized in that, The lead screw assembly includes a bidirectional lead screw (5), a left nut (10-1), a right nut (10) and two nut seats (11). The middle part of the bidirectional lead screw (5) is rotatably connected to the central longitudinal rail seat (1), and the two ends of the bidirectional lead screw (5) are respectively rotatably connected to the left longitudinal rail seat (15-1) and the right longitudinal rail seat (15). The left nut (10-1) and the right nut (10) are arranged in a mirror image and are respectively located on both sides of the central longitudinal rail seat (1). Among them, the left nut (10-1) is in a helical transmission connection with the left part of the bidirectional lead screw (5), the right nut (10) is in a helical transmission connection with the right part of the bidirectional lead screw (5), and the directions of the left nut (10-1) and the right nut (10) in helical transmission with the bidirectional lead screw are opposite. The nut seat (11) on the left side is sleeved on the left nut (10-1) and fixedly connected thereto, and the nut seat (11) on the right side is sleeved on the right nut (10) and fixedly connected thereto.

3. The double-plug pulling and locking mechanism according to claim 2, characterized in that, The transverse and longitudinal translation assembly includes a left longitudinal rail (20-1), a left transverse rail seat (21-1), a central longitudinal rail (25), a central transverse rail seat (21), a right longitudinal rail (20), a right transverse rail seat (21-2), a transverse rail (14), a left sliding seat (12-1) and a right sliding seat (12). The left transverse rail seat (21-1), the central transverse rail seat (21) and the right transverse rail seat (21-2) have the same structure. The left longitudinal rail (20-1) is installed in the left longitudinal rail seat (15-1). The left transverse rail seat (21-1) is sleeved on the left longitudinal rail (20-1) and is slidably connected thereto. The central longitudinal rail (25) is installed in the central longitudinal rail seat (1). The central transverse rail seat (21) is sleeved on the central longitudinal rail (25) and is slidably connected thereto. The right longitudinal rail (20) is installed in the right longitudinal rail seat (15). The right transverse rail seat (21-2) is sleeved on the right longitudinal rail (20) and is slidably connected thereto. The two ends of the transverse rail (14) are respectively fixedly connected to the left transverse rail seat (21-1) and the right transverse rail seat (21-2), and the middle of the transverse rail (14) is fixed in the central transverse rail seat (21). The left sliding seat (12-1) and the right sliding seat (12) are arranged in a mirror image on both sides of the central transverse rail seat (21). The left sliding seat (12-1) is sleeved on the left part of the transverse rail (14) and is slidably connected thereto. The right sliding seat (12) is sleeved on the right part of the transverse rail (14) and is slidably connected thereto. The left door-carrying frame (19-1) is fixedly connected to the left sliding seat (12-1), and the right door-carrying frame (19) is fixedly connected to the right sliding seat (12). One ends of the two connecting rods (9) are respectively rotatably connected to the two nut seats (11), and the other ends of the two connecting rods (9) are respectively rotatably connected to the left sliding seat (12-1) and the right sliding seat (12) through the second shaft (8).

4. A double plug pull and lock mechanism according to claim 3, characterized in that, It further includes a drive motor (18), a motor adapter base (16) and a coupling (17). The drive motor (18) is fixed on the right longitudinal rail base (15) through the motor adapter base (16); one end of the output shaft of the drive motor (18) is connected to the bidirectional lead screw (5) through the coupling (17).

5. A sliding plug door, characterized in that, It includes a left door body, a right door body and a double-opening plug-pulling and locking mechanism according to any one of claims 1-4. The left door body is fixed on the left door carrier (19-1), and the right door body is fixed on the right door carrier (19).

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