Waterproof and dustproof locking structure of railway vehicle door

Abstract

The invention relates to the technical field of vehicle door locking structures, in particular to a waterproof and dustproof locking structure of a railway vehicle door, which comprises a locking assembly, a guide groove assembly and an execution assembly, the locking assembly is used for extruding and locking a vehicle door body, and the locking assembly comprises a gear I and a gear cover which are mounted in a mounting seat; the first gear is located in the gear cover, the circle center of the first gear is located on the same vertical line, a toothed bar movably penetrates through the surface of the gear cover and is meshed with the first gear, a roller is assembled at the end of the toothed bar, the guide groove assembly is used for guiding the roller to move, and the execution assembly is matched with the locking assembly to open and close the two vehicle door bodies. Through cooperation of the connecting assembly and the execution assembly, the sealing rubber strip and the rubber sealing strip are extruded more tightly, and therefore the waterproof and dustproof effects are improved; and the waterproof and dustproof effects are further improved through cooperation of the locking assembly and the guide groove assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of door locking structures, and specifically provides a waterproof and dustproof locking structure for the doors of rail vehicles. Background Art

[0002] Subways, as common means of transportation, usually have the functions of dustproof and waterproof. The reason is that there are many electrical devices in the carriages. When dust enters the interior of the carriages, it will affect the heat dissipation of the electrical devices, causing the devices to overheat, shortening their service life, and even causing failures. And the entry of water may cause serious problems such as short circuits and electric leakage, damaging the devices and affecting the normal operation of the subway.

[0003] During the operation of subway doors, they need to be opened and closed frequently. The key to their waterproof and dustproof performance lies in the sealing structure between the door and the door frame. Currently, the opening and closing methods of subway doors mainly include translational, micro-motion plug-and-pull, and right-angle plug-and-pull. Among them, in the micro-motion plug-and-pull method, the door first moves outward along the inclined guide groove (out of the inner cavity of the door frame), and then translates horizontally to the opening position, increasing the compression amount of the sealing rubber strip through a compound motion.

[0004] However, in the opening and closing method of the micro-motion plug-and-pull type, although the sealing performance is enhanced through the inclined movement, after being completely closed, there is a lack of continuous pressing force between the door body and the door frame, and the waterproof and dustproof performance may decline due to elastic relaxation or vibration of the sealing rubber strip. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a waterproof and dustproof locking structure for the doors of rail vehicles to solve the problems mentioned in the above background art.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A waterproof and dustproof locking structure for the doors of rail vehicles includes two door bodies. Sealing rubber strips are provided on the sides of the two door bodies, and the opposite sides of the two door bodies are symmetric inclined planes; a door frame assembled on the rail vehicle, one side of the door frame corresponding to the door body is provided with the same inclined plane, and an installation seat is provided at the bottom of the door frame; a locking assembly, including a first gear and a gear cover installed inside the installation seat. The first gear is located inside the gear cover and the centers are on the same vertical line. A tooth rod penetrates through the surface of the gear cover movably. The tooth rod meshes with the first gear. A roller is assembled at the end of the tooth rod. The first gear is rotated by an external drive; a guide groove assembly, including a horizontal groove and an inclined groove opened on the door body. The horizontal groove is communicated with the inclined groove and both are communicated with the outside. Anti-disengagement plates adapted to the shapes inside the grooves are provided at the edges of the horizontal groove and the inclined groove. The roller abuts against the surface of the anti-disengagement plate; an execution assembly for opening and closing the two door bodies.

[0007] Preferably, a gear 2 and a worm wheel coaxial with the gear are installed inside the mounting seat, and a worm is assembled inside the mounting seat, and the worm drives the rotation of the worm wheel, and the worm is driven by an external motor.

[0008] Preferably, a reversing gear meshing with gear 2 is installed inside the mounting seat, and gear 3 coaxial with the reversing gear and the gear is installed inside the mounting seat respectively, and the two gears 3 are connected by a transmission belt.

[0009] Preferably, a limiting groove is provided on a side surface of the gear rod, and a guide block is installed at a position of the gear cover corresponding to the limiting groove, and the guide block is movably installed inside the limiting groove.

[0010] Preferably, the actuator assembly includes two sections of screw rods with opposite threads, the screw rods are driven by an external motor, the screw rods are installed on one side of the door frame through a fixed seat, the surface of the screw rods is threadedly sleeved with two annular movable seats, the surface of the movable seat is provided with a limit block with one side being flat, the flat side of the limit block abuts against the surface of the door frame, the surface of the movable seat is sleeved with a rotating connecting assembly, one end of the connecting assembly is fixed to the vehicle door body.

[0011] Preferably, the connecting assembly includes a ring sleeved on the surface of the movable seat, the surface of the ring is provided with an arc rod connected to the door body, the surfaces of the two arc rods are penetrated by a cross bar, and the two ends of the cross bar are installed on the fixed seat.

[0012] Preferably, an extrusion block with an isosceles trapezoidal cross section is fixedly mounted on the surface of the door frame, the inclination of the side of the extrusion block is the same as the inclination of the side of the door body, and the edge of the arc rod rests on the inclined surface of the extrusion block.

[0013] Preferably, the opposite sides of the two door bodies are arranged as inclined surfaces with the same inclination.

[0014] Preferably, the side edges of the vehicle door body are each provided with a plurality of grooves, and the surface of the sealing strip is provided with a plurality of integrally formed protrusions, and the protrusions are stuck in the inside of the grooves.

[0015] Preferably, a protruding frame edge is provided on the surface of the door body, and the frame edge abuts against the surface of the door frame. A rubber sealing strip is embedded in the surface of the door frame, and the frame edge abuts against the surface of the rubber sealing strip.

[0016] 1. The above technical solution has the following advantages or beneficial effects: The present invention provides a waterproof and dustproof locking structure for the doors of rail vehicles. By setting an arc rod, a pressing block, a lead screw and a moving seat, when the lead screw drives the moving seats to move closer to each other, the sides of the door body are squeezed closer to each other, squeezing the sealing strip to form a tighter seal. At the same time, the inclined surfaces on both sides of the pressing block will squeeze the arc rod, causing it to rotate inward into the vehicle, and the two door bodies will be closer to the door frame, and the sealing strip and rubber sealing strip between them will also be squeezed tighter, thereby improving the waterproof and dustproof effect.

[0017] 2. The above technical solution has the following advantages or beneficial effects: The present invention provides a waterproof and dustproof locking structure for the doors of rail vehicles. By setting a horizontal groove, an inclined groove and a roller, after the door body is closed, when the toothed rod moves, it drives the gear cover to rotate until it abuts against the anti-disengagement plate at the position of the horizontal groove. At this time, the sealing strip on the inclined surface of the door body will squeeze the inclined surface of the door frame. When the worm continues to rotate, the inclined surface of the sealing strip will be squeezed tighter, thereby further improving the waterproof and dustproof effect.

[0018] 3. The above technical solution has the following advantages or beneficial effects: The present invention provides a waterproof and dustproof locking structure for the doors of rail vehicles. Through the cooperation of the connection component and the execution component, as well as the cooperation of the locking component and the guide groove component, when the door body is closing, the contact between the doors and between the door and the door frame is closer, jointly improving the waterproof and dustproof effect of the door. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, the present invention and its features, shape and advantages will become more obvious. The same reference numerals indicate the same parts in all the drawings. The drawings are not deliberately drawn to scale, and the emphasis is on showing the gist of the present invention.

[0020] Figure 1 is a three-dimensional structural schematic diagram of a waterproof and dustproof locking structure for the doors of rail vehicles provided by the present invention.

[0021] Figure 2 is a three-dimensional structural schematic diagram of the door frame.

[0022] Figure 3 is a three-dimensional structural schematic diagram of the door body.

[0023] Figure 4 is a partial three-dimensional structural schematic diagram of the installation position of the lead screw.

[0024] Figure 5 is a three-dimensional structural schematic diagram of the locking component.

[0025] Figure 6 isFigure 5 Front elevation sectional plane structure schematic diagram.

[0026] Figure 7 It is a sectional plane structure schematic diagram of the roller being snapped into the inside of the guide groove assembly.

[0027] Figure 8 It is a top view sectional plane structure schematic diagram of the door body located inside the door frame.

[0028] In the figure: 1. Door body; 2. Sealing strip; 3. Door frame; 4. Mounting seat; 5. First gear; 6. Gear cover; 7. Rack; 8. Roller; 9. Horizontal groove; 10. Inclined groove; 11. Anti - detachment plate; 12. Second gear; 13. Worm gear; 14. Worm; 15. Reversing gear; 16. Third gear; 17. Transmission toothed belt; 18. Limit groove; 19. Guide block; 20. Lead screw; 21. Fixed seat; 22. Moving seat; 23. Limit block; 24. Collar; 25. Arc rod; 26. Cross bar; 27. Extrusion block; 28. Frame edge; 29. Rubber sealing strip. Specific implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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 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.

[0030] In order to enable those in the technical field to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] Figure 1 It is a locking state schematic diagram of a waterproof and dust - proof locking structure of a rail vehicle door, which can be used in means of transportation such as subways and buses.

[0032] Such as Figure 1 And Figure 8As shown in the figure, it includes two identical door bodies 1 and a door frame 3 assembled on the vehicle. Symmetrical windows and door handle grooves are provided on the door body 1. Sealing rubber strips 2 are provided on the peripheral sides of the two door bodies 1. When the door body 1 is closed, the adjacent sealing rubber strips 2 are squeezed into contact to form a seal. The opposite sides of the two door bodies 1 are provided with symmetrical inclined planes. The sealing rubber strips 2 at this position are also of the same inclined plane, and the positions where the door frame 3 is in close contact with the sealing rubber strips 2 are also of the same inclined plane. The surface of the sealing rubber strips 2 is provided with a plurality of protrusions, and the corresponding installation positions on the door body 1 are provided with matching grooves. The sealing rubber strips 2 can be glued to the positions on the door frame 3 that need to be sealed. The more the number of protrusions and grooves, the larger the contact area between the sealing rubber strips 2 and the door body 1, and the more firmly the sealing rubber strips 2 are glued. The opposite sides of the two door bodies 1 are provided with the same inclined planes. Similarly, the contact positions of the sealing rubber strips 2 at this position are also of the same inclined plane, which increases the contact area between the two sealing rubber strips 2, thereby improving the waterproof and dustproof sealing performance when closed.

[0033] As Figure 1 , Figure 3 and Figure 7 shown, a guide groove assembly is provided on the inner side of the door body 1 inside the vehicle, including a horizontal groove 9 and an inclined groove 10 that are internally connected. Both the horizontal groove 9 and the inclined groove 10 communicate with the inside of the vehicle, and anti - detachment plates 11 are provided at the top and bottom edges of both the horizontal groove 9 and the inclined groove 10. An installation seat 4 is provided at the bottom of the door frame 3, and a locking assembly is provided inside the installation seat 4.

[0034] As Figures 5 - 7 shown, the locking assembly includes rollers 8 provided inside the horizontal groove 9 and the inclined groove 10. A first gear 5 and a gear cover 6 are installed inside the installation seat 4. A rotating shaft is fixed at the center of the first gear 5, and the rotating shaft is installed inside the installation seat 4 through a bearing. The gear cover 6 includes an outer cover and a connecting shaft above it. The outer cover is sleeved on the surface of the first gear 5, and the connecting shaft is installed inside the installation seat 4 through a bearing. A tooth bar 7 passes through the outer cover of the gear cover 6 movably. The tooth bar 7 meshes with the first gear 5 and one end extends into the horizontal groove 9. The rollers 8 are assembled at the end of the tooth bar 7.

[0035] To prevent the tooth bar 7 from falling off from inside the gear cover 6, a limiting groove 18 is provided on the side surface of the tooth bar 7. The limiting groove 18 does not need to penetrate the entire tooth bar 7 from front to back. A guiding block 19 formed integrally is provided at the corresponding position inside the gear cover 6, and the guiding block 19 is located inside the limiting groove 18.

[0036] Gear No. 2 12 and worm wheel 13 are fixedly sleeved on the surface of one of the rotating shafts, so that gear No. 2 12 and worm wheel 13 at this position rotate coaxially. A reversing gear 15 is installed inside the mounting seat 4 through a circular shaft, and the reversing gear 15 is meshed with gear No. 2 12. Gear No. 3 16 is fixedly sleeved on the surface of the circular shaft and the other rotating shaft, and the two gears No. 3 16 are rotationally connected through a transmission toothed belt 17. A worm 14 is also installed inside the mounting seat 4 to drive the worm wheel 13 to rotate, and the worm 14 is driven to rotate by an external motor (not shown in the figure).

[0037] An actuator assembly is mounted on the top of the door frame 3 to open and close the two door bodies 1 .

[0038] When the door body 1 is opened, the worm 14 rotates to drive the worm wheel 13 to rotate, and the coaxial gear 12 and gear 15 are driven to rotate, and the reversing gear 15 meshes with the gear 2 12 to reverse. Due to the transmission effect of the transmission toothed belt 17, the gear 3 16 coaxial with the reversing gear 15 drives the gear 3 16 at another position to reverse, thereby realizing the reversal of the two gears 15. Figure 7 Taking one of the gears 15 as an example, when gear 15 rotates, it will first drive the gear rod 7 to move forward until the surface of the roller 8 is against the inclined surface of the inclined groove 10. At this time, the inclined surface at this position will squeeze and guide the roller 8, and the gear rod 7 gradually begins to drive the gear cover 6 to rotate until the roller 8 is difficult to move. At this time, when gear 15 rotates again, it will drive the gear rod 7 and the roller 8 to squeeze the door body 1, and cooperate with the actuator to make it move obliquely until it is completely out of the door frame 3. Then the actuator continues to work, and the two door bodies 1 move away from each other and open. In this process, the worm 14 reverses, but the roller 8 needs to be against the inclined surface of the inclined groove 10 all the time until the transverse groove 9 moves to the position of the roller 8. It is also necessary to ensure that the roller 8 is against the inner wall of the transverse groove 9. This process can be This is achieved by setting a pressure sensor on the surface of the roller 8. When the pressure sensor on the roller 8 is subjected to the squeezing force from the inner wall of the transverse groove 9 or the inclined groove 10, the pressure sensor converts the sensed pressure into an electrical signal, amplifies and modulates the electrical signal, and finally converts the electrical signal into a digital signal, and transmits the digital signal to the controller. The controller determines whether the pressure value is within the set range. If the pressure value is within the set pressure threshold range, the controller controls the drive motor to self-lock. At this time, the roller 8 does not move. If the pressure value is less than or greater than the pressure threshold, that is, the sensed pressure value is not within the set pressure threshold range, the controller controls the drive motor to rotate forward or reverse. It should be noted that the pressure threshold can be set according to actual conditions.

[0039] During the process of closing the door body 1, it is also necessary to ensure that the roller 8 abuts against the inner walls of the horizontal groove 9 and the inclined groove 10 until the two door bodies 1 are completely closed. At this time, the worm 14 rotates reversely again until the surface of the roller 8 abuts against the surface of the anti-disengagement plate 11. At this time, the inclined surface of the anti-disengagement plate 11 at the position of the inclined groove 10 guides the roller 8, so that the rack 7 drives the gear cover 6 to rotate during the movement until it moves onto the anti-disengagement plate 11 at the position of the horizontal groove 9. At this time, the sealing strip 2 on the inclined surface of the door body 1 will squeeze the inclined surface of the door frame 3. When the worm 14 continues to rotate, the inclined surface of the sealing strip 2 will be squeezed more tightly, thereby improving the waterproof and dustproof effect.

[0040] It should be noted that the lead angle of the worm 14 needs to be less than the equivalent friction angle of the worm gear 13 to ensure the self-locking property of the worm 14 transmission.

[0041] As Figure 1 、 Figure 2 and Figure 4 shown, the execution component includes two lead screws 20 with reverse threads. Two fixed seats 21 are assembled at the top of the door frame 3. The lead screws 20 are installed between the two fixed seats 21. The rotation of the lead screws 20 is driven by an external motor (the motor is not shown in the figure). Ring-shaped moving seats 22 are respectively threadedly sleeved at different positions of the two threads of the lead screws 20. A limiting block 23 with a flat side is welded on the surface of the moving seat 22. The flat surface of the limiting block 23 abuts against the flat surface of the door frame 3. When the lead screws 20 rotate, the limiting block 23 will limit the moving seat 22, so that the two moving seats 22 move along the axial direction of the lead screws 20.

[0042] Two rotatable collar rings 24 are sleeved on the surface of the moving seat 22. The collar rings 24 can be installed on the surface of the moving seat 22 through bearings. When the moving seat 22 moves, it will also drive the collar rings 24 to move. An arc-shaped rod 25 is welded on the surface of the collar ring 24. One end of the arc-shaped rod 25 is provided with a hinge seat, and the hinge seat can be stuck on the surface of the door body 1 to slide. A cross bar 26 penetrates through the surfaces of the two arc-shaped rods 25. Both ends of the cross bar 26 are slidably installed on the fixed seat 21. An extrusion block 27 with an isosceles trapezoid cross-section is fixedly installed on the surface of the door frame 3. The inclination degree of the side surface of the extrusion block 27 is the same as that of the side surface of the door body 1. The edge of the arc-shaped rod 25 abuts against the inclined surface of the extrusion block 27.

[0043] When the door body 1 is opened, the motor drives the lead screw 20 to rotate forward. Due to the limiting effect of the limiting block 23, the two moving seats 22 move away from each other. Through the collar 24 and the arc-shaped rod 25, the two door bodies 1 are driven to move away from each other. During this process, the locking assembly will exert an oblique extrusion on the door body 1. Therefore, a force perpendicular to the door body 1 is generated to make the arc-shaped rod 25 rotate, and the hinge seat will move upward on the surface of the door body 1. As the lead screw 20 continues to rotate, the two door bodies 1 gradually move away from each other.

[0044] When the door body 1 is closed, the motor drives the lead screw 20 to rotate reversely. Similarly, it will drive the two door bodies 1 to move closer to each other until the two door bodies 1 are completely closed. During this process, the inclined surface of the extrusion block 27 will extrude and rotate the two arc-shaped rods 25, causing the two arc-shaped rods 25 to rotate towards the inside of the vehicle, making the closing of the door body 1 tighter. And when the two door bodies 1 are closed tightly with each other, the closing towards the door will also be tighter, thereby improving the dust and waterproof performance.

[0045] As Figure 2 and Figure 3 shown, a protruding frame edge 28 is provided on the surface of the door body 1. The frame edge 28 abuts against the surface of the door frame 3. A rubber sealing strip 29 is embedded in the surface of the door frame 3. When the door body 1 moves closer to the door frame 3, the frame edge 28 will also move closer to the door frame 3 and abut against the surface of the rubber sealing strip 29, thereby producing a better dust and waterproof effect.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0047] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "connected", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0048] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and the devices and structures not described in detail therein should be understood to be implemented in a common manner in the art; any person skilled in the art can make many possible changes and modifications without departing from the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, which does not affect the essence of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A waterproof and dustproof locking structure for a rail vehicle door, characterized in that: include Two door bodies, the sides of the two door bodies are provided with sealing strips to improve the waterproof and dustproof sealing performance of the door bodies when they are closed, and the opposite sides of the two door bodies are provided with symmetrical inclined surfaces; A door frame mounted on a rail vehicle, wherein a side of the door frame corresponding to the door body is provided with a same inclined surface, and a mounting seat for mounting a locking assembly is provided at the bottom of the door frame; A locking assembly for squeezing and locking a door body, comprising a gear 1 and a gear cover installed inside a mounting seat, wherein the gear 1 is located inside the gear cover and the center of the circle is located on the same vertical line, a gear rod is movably penetrated through the surface of the gear cover, the gear rod is meshed with the gear 1, and a roller is installed at the end of the gear rod; A guide groove assembly for guiding the roller includes a transverse groove and an oblique groove provided in the door body, wherein the transverse groove is connected to the oblique groove and both are connected to the outside, and the edges of the transverse groove and the oblique groove are provided with an anti-slip plate adapted to the shape of the groove, and the roller abuts against the surface of the anti-slip plate; The actuator assembly cooperates with the locking assembly to enable the two door bodies to open and close.

2. The waterproof and dustproof locking structure for a rail vehicle door according to claim 1, characterized in that: A gear 2 and a worm wheel coaxial with the gear are installed inside the mounting seat, and a worm is assembled inside the mounting seat, and the worm is driven by an external motor.

3. The waterproof and dustproof locking structure for a rail vehicle door according to claim 2, characterized in that: A reversing gear meshing with gear 2 is installed inside the mounting seat, and gear 3 coaxial with the reversing gear and the gear is installed inside the mounting seat respectively, and the two gears 3 are connected by a transmission belt transmission.

4. The waterproof and dustproof locking structure for a rail vehicle door according to claim 1, characterized in that: A limiting groove is provided on the side of the gear rod, and a guide block is installed at a position of the gear cover corresponding to the limiting groove, and the guide block is movably installed inside the limiting groove.

5. The waterproof and dustproof locking structure for a rail vehicle door according to claim 1, characterized in that: The actuator assembly includes two sections of screw rods with opposite threads, which are driven by an external motor and installed on one side of the door frame through a fixed seat. Two annular movable seats are threadedly sleeved on the surface of the screw rod, and a limit block with a flat side is provided on the surface of the movable seat. The flat side of the limit block abuts against the surface of the door frame, and a rotating connecting assembly is sleeved on the surface of the movable seat, and one end of the connecting assembly is fixed to the vehicle door body.

6. The waterproof and dustproof locking structure for a rail vehicle door according to claim 5, characterized in that: The connecting assembly includes a ring sleeved on the surface of the movable seat, the surface of the ring is provided with an arc rod connected to the vehicle door body, one end of the arc rod is slidably installed on the vehicle door body, a cross bar passes through the surfaces of the two arc rods, and the two ends of the cross bar are installed on the fixed seat.

7. The waterproof and dustproof locking structure for a rail vehicle door according to claim 6, characterized in that: An extrusion block with an isosceles trapezoidal cross section is fixedly mounted on the surface of the door frame. The inclination of the side surface of the extrusion block is the same as that of the side surface of the door body. The edge of the arc rod abuts against the inclined surface of the extrusion block.

8. The waterproof and dustproof locking structure for a rail vehicle door according to claim 1, characterized in that: The opposite sides of the two door bodies are arranged as inclined surfaces with the same inclination.

9. The waterproof and dustproof locking structure for a rail vehicle door according to claim 1, characterized in that: The side edges of the door body are each provided with a plurality of grooves, and the surface of the sealing strip is provided with a plurality of integrally formed protrusions, which are clamped in the interior of the grooves.

10. The waterproof and dustproof locking structure of a rail vehicle door according to claim 1, characterized in that: The surface of the door body is provided with a protruding frame edge, the frame edge abuts against the surface of the door frame, the surface of the door frame is embedded with a rubber sealing strip, the frame edge abuts against the surface of the rubber sealing strip.

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