Connecting rod structure sealed end door and packaging box

Abstract

The present invention relates to the technical field of box sealing doors, and specifically to a connecting rod structure sealing end door and packaging box. The connecting rod structure sealing end door includes: a door body, a rotating shaft inserted through the center of its surface; a connecting rod mechanism, which includes a crank, the middle part of the crank is fixedly sleeved on the inner end of the rotating shaft, and both ends of the crank are sequentially connected with connecting rods and sliders to form two sets of crank slider mechanisms symmetrically distributed up and down, the slider is slidably connected to the inner surface of the door body and the sliding direction is up and down, the left and right sides of the slider are hinged with a linkage rod, the end of the linkage rod away from the slider is hinged with at least one set of buckles, the buckles are slidably connected to the inner surface of the door body, and the buckles on the left and right sides of the slider are symmetrically distributed; the door frame, the inner side wall of which is provided with a slot, and the slot is adapted to the buckle. This end door has a higher unpacking speed, can avoid deformation of the box body, can also avoid damage from bumps, and ensure the service life of the structure.

Description

Technical Field

[0001] The present invention relates to the technical field of box sealing doors, and in particular to a sealing end door with a connecting rod structure and a packaging box. Background Art

[0002] Packaging boxes are mainly used for storage and transportation of products. They can protect products from corrosion and mechanical damage and usually have functions such as shoveling, stacking, lifting and chain lifting.

[0003] Currently, packaging boxes are primarily categorized as either top-and-bottom opening or end-door opening. To ensure airtightness, the end-door opening structure typically utilizes evenly distributed buckles, with the number of buckles increasing or decreasing with product size. This structure has the following drawbacks: First, when the product is large, the excessive number of buckles slows down the unpacking process; second, the buckles at the bottom of the box are easily damaged during the opening and closing of the end door, increasing the number of repairs; and third, the buckles are prone to concentrated force during closing, causing deformation of the end door and compromising the box's airtightness. Summary of the Invention

[0004] In order to overcome the technical defects of existing end-door opening packaging boxes, such as slow opening speed, high number of renovations and easy deformation of the end door, the present invention provides a connecting rod structure sealed end door and packaging box.

[0005] The connecting rod structure sealed end door and packaging box provided by the present invention include:

[0006] The door body has a rotating shaft inserted through the center of its surface;

[0007] A connecting rod mechanism, comprising a crank, wherein the middle portion of the crank is fixedly sleeved on the inner end of the rotating shaft, and both ends of the crank are sequentially connected to connecting rods and sliders to form two sets of crank-slider mechanisms symmetrically distributed up and down, wherein the slider is slidably connected to the inner surface of the door body and slides in an up and down direction, and the left and right sides of the slider are hinged with linkage rods, and the ends of the linkage rods away from the sliders are hinged with at least one set of buckles, and the buckles are slidably connected to the inner surface of the door body, and the buckles on the left and right sides of the slider are symmetrically distributed;

[0008] The door frame has an inner side wall provided with a card slot, the card slot being adapted to fit the card buckle;

[0009] The buckle has a locked state in which it is engaged in the slot and a free state in which it is detached from the slot. When the buckle is in the locked state, the door body and the door frame are sealed together. The buckle can be switched between the locked state and the free state by rotating the rotating shaft.

[0010] When in use, the door body is fastened to the door frame, and the crank is driven by rotating the shaft. The crank drives the connecting rod to rotate, and the connecting rod drives the slide to slide in the up and down direction, thereby driving the linkage rod to rotate, and then driving the buckle to slide along the door body, ultimately switching the buckle between the locked state and the free state. When the buckle is in the locked state, the door body is closed; when the buckle is in the free state, the door body can be removed to open the door body.

[0011] Optionally, the end of the linkage rod away from the slider is hinged with two sets of clips, one set of clips slides in the left-right direction relative to the door body, and the other set of clips slides in the up-down direction relative to the door body.

[0012] Optionally, the buckle includes:

[0013] A card block is slidably connected to the inner surface of the door body, wherein a first end of the card block in the sliding direction is adapted to be engaged in the card slot, and a mounting window is provided in the middle of the card block;

[0014] a sliding rod, which is slidably inserted into the card block and is parallel to the sliding direction of the card block, a first end of the sliding rod extends into the installation window and is fixed with an anti-slip member, the anti-slip member is suitable for preventing the sliding rod from escaping from the installation window, a second end of the sliding rod extends outward from the second end of the card block in the sliding direction, a limiting member is fixed to the second end of the sliding rod and is hinged to the linkage rod;

[0015] A spring is sleeved on the slide bar and located between the clamping block and the limiting member.

[0016] Optionally, the outer surface of the first end of the locking block in the sliding direction is set to be an inclined surface to form a wedge block.

[0017] Optionally, a sealing groove is provided along the edge of the outer surface of the door frame, a sealing ring is embedded in the sealing groove, and an installation groove is provided on the inner edge of the inner surface of the door frame, a rectangular clamping ring is fixed in the installation groove, and the rectangular clamping ring surrounds the clamping groove.

[0018] Optionally, the inner surface of the door body is provided with guide blocks arranged opposite to each other on the left and right, and a slide groove arranged up and down is formed between the two guide blocks, and the end of the slider away from the rotating shaft is slidably connected in the slide groove, and the inner surface of the door body is also provided with a strip guide rail, which is arranged up and down and is located on the side of the slide groove facing the rotating shaft, and the end of the slider close to the rotating shaft is slidably connected to the strip guide rail, and the side wall of the slider close to the end of the rotating shaft is hinged to the linkage rod.

[0019] Optionally, a handle is hinged to the outer end of the rotating shaft and the hinge axis is arranged horizontally, and a lock groove is provided on the outer surface of the door body. When the buckle is in a locked state, the handle can be locked in the lock groove by rotation.

[0020] Optionally, the handle includes a grip portion and a telescopic rod formed by an inner slide rod and an outer sleeve, one end of the telescopic rod is hinged to the outer end of the rotating shaft, and the other end is fixedly connected to the grip portion, and an elastic member is connected between the inner slide rod and the outer sleeve, and the elastic member is suitable for driving the grip portion to abut against the groove wall of the lock groove when the handle is clamped in the lock groove.

[0021] Optionally, the inner sliding rod is connected to the outer end of the rotating shaft, and the outer sleeve is connected to the hand grip. The inner sliding rod is provided with a sliding hole arranged along its length direction, and a sliding pin is fixed on the outer sleeve. The sliding pin is placed in the sliding hole. The inner sliding rod is a hollow rod and a limiting pin is fixed at the end away from the rotating shaft. The elastic member is a compression spring, and the compression spring is pressed between the sliding pin and the limiting pin.

[0022] The packaging box provided by the present invention comprises a box body, wherein the box body is provided with the aforementioned connecting rod structure sealed end door.

[0023] The technical solution provided by the present invention has the following advantages compared with the prior art:

[0024] The connecting rod structure provided by the present invention seals the end door. Rotating the shaft drives all buckles to operate simultaneously, allowing them to engage or disengage from the slots. Compared to existing methods of operating buckles one by one, this allows for faster unpacking, saving time and effort. The simultaneous operation of all buckles also prevents deformation of the box body caused by excessive stress on a certain part of the box, thereby ensuring the box's airtightness. Furthermore, the door frame and door body are locked together by the buckles and slots. Both the buckles and slots are internal to the structure and are not exposed to the outside world, thus preventing damage from bumps and ensuring the service life of the structure.

[0025] The packaging box provided by the present invention has the aforementioned advantages because it has the aforementioned connecting rod structure to seal the end door. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 A schematic diagram showing the structure of a connecting rod structure sealing end door according to an embodiment of the present invention;

[0029] Figure 2 A schematic diagram showing the exploded structure of a door body according to an embodiment of the present invention;

[0030] Figure 3 A schematic diagram showing the structure of a door trim panel of a door body according to an embodiment of the present invention;

[0031] Figure 4 A schematic diagram showing the exploded structure of a handle according to an embodiment of the present invention;

[0032] Figure 5 A schematic structural diagram of a connecting rod mechanism according to an embodiment of the present invention is shown;

[0033] Figure 6 A schematic diagram showing the structure of a buckle in an embodiment of the present invention;

[0034] Figure 7 Schematic diagram showing the exploded structure of the outer surface of the door frame according to an embodiment of the present invention

[0035] Figure 8 Schematic diagram showing the exploded structure of the inner surface of the door frame in an embodiment of the present invention.

[0036] In the picture:

[0037] 1. Door body; 11. Rotating shaft; 12. Guide block; 13. Guide rail; 14. Door body; 15. Door trim; 151. Lock slot; 16. Baffle; 17. Mounting flange; 18. First bearing; 19. Second bearing; 2. Connecting rod mechanism; 21. Crank; 211. Mounting portion; 22. Connecting rod; 23. Slider; 24. Linkage rod; 25. Buckle; 251. Block; 252. Slider; 253. Anti-lock mechanism Release piece; 254, limit piece; 255, spring; 256, wedge block; 3, door frame; 31, slot; 32, sealing slot; 33, sealing ring; 34, rectangular clamp; 4, handle; 41, hand grip; 411, belly rod; 412, wing rod; 42, telescopic rod; 421, inner slide rod; 4211, sliding hole; 4212, limit pin; 422, outer sleeve; 4221, sliding pin; 423, elastic piece. DETAILED DESCRIPTION

[0038] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0039] In the description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance. It should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, removable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms based on specific circumstances.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all the embodiments.

[0041] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Example 1

[0042] Reference Figure 1 The present embodiment provides a connecting rod structure sealed end door, comprising a door body 1, a connecting rod mechanism 2 and a door frame 3. A rotating shaft 11 is inserted through the center of the surface of the door body 1. The connecting rod mechanism 2 comprises a crank 21, the middle part of the crank 21 is fixedly sleeved on the inner end of the rotating shaft 11, and both ends of the crank 21 are sequentially connected with a connecting rod 22 and a slider 23 to form two sets of crank 21 and slider 23 mechanisms symmetrically distributed up and down. The slider 23 is slidably connected to the inner surface of the door body 1 and the sliding direction is up and down. The left and right sides of the slider 23 are hinged with a linkage rod 24, and the end of the linkage rod 24 away from the slider 23 is hinged with at least one set of buckles 25. The buckles 25 are slidably connected to the inner surface of the door body 1, and the buckles 25 on the left and right sides of the slider 23 are symmetrically distributed. The inner wall of the door frame 3 is provided with a card slot 31, and the card slot 31 is adapted to the buckle 25. The buckle 25 has a locked state in which it is engaged in the slot 31 and a free state in which it is disengaged from the slot 31. When the buckle 25 is in the locked state, the door body 1 and the door frame 3 are sealed together. The buckle 25 can be switched between the locked state and the free state by rotating the shaft 11.

[0043] like Figure 2 As shown, the structure of the door body 1 of this embodiment is specifically as follows:

[0044] The door body 1 includes a door body 14 and a door trim panel 15 . The door trim panel 15 is fixed to the outer surface of the door body 14 . The connecting rod 22 assembly is installed on the inner surface of the door body 14 . The rotating shaft 11 passes through both the door body 14 and the door trim panel 15 .

[0045] This door body 1 structure is divided into two parts and is easy to process. In other embodiments, the door body 1 can also be an integrated structure.

[0046] like Figure 2 As shown, the inner surface sliding structure of the door body 1 of this embodiment is specifically as follows:

[0047] A sliding groove is integrally formed on the inner surface of the door body 1, and the clip 25 is slidably connected in the sliding groove. A baffle 16 is fixed on the inner side of the sliding groove to limit the movement of the clip 25 in the inward and outward directions; the inner surface of the door body 1 is fixedly connected with a strip guide rail 13 and a guide block 12 to realize the sliding connection of the slider 23, and the movement of the slider 23 in the inward and outward directions is limited by the self-limiting structure of the strip guide rail 13 and the guide block 12.

[0048] This sliding structure is a structure that can be separated in the inner and outer directions. When installing, the buckle 25 or the slider 23 can be placed vertically for assembly, which is simpler and more convenient. In other embodiments, the sliding structure can also be integrally formed, and the buckle 25 or the slider can be slid into the assembly from the side.

[0049] like Figure 2 As shown, the installation structure of the rotating shaft 11 of this embodiment is specifically as follows:

[0050] A mounting flange 17 is fixed to the inner surface of the door body 1, and a first bearing 18 is fixed in the mounting flange 17. The inner end of the rotating shaft 11 is fixed in the first bearing 18; the middle part of the rotating shaft 11 is installed in the door body 1 through the second bearing 19; the outer end of the rotating shaft 11 extends outward from the door body 1 to connect to the handle 4.

[0051] This mounting structure allows the inner end and middle portion of the rotating shaft 11 to be supported by bearings, making the connection more reliable. In other embodiments, the rotating shaft 11 can also be rotatably mounted using only one bearing; it can also be directly sleeved into the door body 1 with a limit structure to prevent axial movement.

[0052] like Figure 2 and Figure 5 As shown, the fixing method of the crank 21 and the rotating shaft 11 is specifically as follows:

[0053] The middle part of the crank 21 expands outward to form a circular mounting portion 211. The inner end of the rotating shaft 11 is set as a stepped shaft. The mounting portion 211 is sleeved on the small diameter shaft section of the stepped shaft and fixed to the stepped surface of the stepped shaft by screws to achieve a fixed connection between the crank 21 and the rotating shaft 11.

[0054] This fixing method is relatively simple to assemble and is relatively secure. In other embodiments, the crank 21 can also be fixed on the rotating shaft 11 by interference fitting.

[0055] like Figure 1 、 Figure 2 and Figure 5 , the connection method of the slider 23 of this embodiment is specifically as follows:

[0056] The inner surface of the door body 1 is provided with guide blocks 12 arranged opposite to each other on the left and right, and a sliding groove arranged up and down is formed between the two guide blocks 12. The end of the slider 23 away from the rotating shaft 11 is slidably connected in the sliding groove. The inner surface of the door body 1 is also provided with a strip guide rail 13. The strip guide rail 13 is arranged up and down and is located on the side of the sliding groove facing the rotating shaft 11. The end of the slider 23 close to the rotating shaft 11 is slidably connected to the strip guide rail 13, and the side wall of the end of the slider 23 close to the rotating shaft 11 is hinged to the linkage rod 24.

[0057] Using guide blocks 12 for guidance does not cover the entire length of slider 23, as space must be reserved on slider 23 for connection to linkage rod 24. Using strip guide rails 13 for guidance generally requires a strip-shaped notch on slider 23 to reduce friction, which also does not cover the entire length of slider 23. In this embodiment, two different sliding connection structures are used at each end of slider 23. This not only covers the entire length of slider 23, ensuring the stability of the sliding connection of slider 23, but also leaves space on slider 23 for connection to linkage rod 24, resulting in a more rational structural design. In other embodiments, slider 23 can also be connected using a dovetail groove structure.

[0058] like Figure 5 As shown, the number of the buckles 25 in this embodiment is specifically:

[0059] Two sets of buckles 25 are hinged on the end of the linkage rod 24 away from the slider 23, one set of buckles 25 slides in the left-right direction relative to the door body 1, and the other set of buckles 25 slides in the up-down direction relative to the door body 1.

[0060] The four linkage rods 24 are connected to a total of eight sets of buckles 25, so that both sides of each corner of the door body 1 are connected to the door frame 3 through the buckles 25, making the connection relatively secure. In other embodiments, a set of buckles 25 can be hingedly connected to the end of the linkage rod 24 away from the slider 23, providing four sets of buckles 25 per connection; or three sets of buckles 25 can be hingedly connected to the end of the linkage rod 24 away from the slider 23, providing twelve sets of buckles 25 per connection.

[0061] like Figure 5 and Figure 6 As shown, the structure of the buckle 25 of this embodiment is specifically as follows:

[0062] The buckle 25 includes a block 251, a slide rod 252 and a spring 255; the block 251 is slidably connected to the inner surface of the door body 1, and the first end of the block 251 in the sliding direction is suitable for being clamped in the slot 31, and an installation window is provided in the middle of the block 251; the slide rod 252 is slidably inserted in the block 251 and is parallel to the sliding direction of the block 251, and the first end of the slide rod 252 extends into the installation window and is fixed with an anti-slip component 253, which is suitable for preventing the slide rod 252 from detaching from the installation window, and the second end of the slide rod 252 extends outward from the second end of the block 251 in the sliding direction, and the second end of the slide rod 252 is fixed with a limiting component 254 and is hinged to the linkage rod 24; the spring 255 is sleeved on the slide rod 252 and is located between the block 251 and the limiting component 254.

[0063] When the linkage rod 24 drives the card block 251 away from the card slot 31, the linkage rod 24 first drives the slide bar 252 to move until the anti-slip part 253 contacts the wall of the window, and the linkage rod 24 continues to move to drive the card block 251 out of the card slot 31; when the linkage rod 24 drives the card block 251 to be stuck in the card slot 31, the linkage rod 24 will first drive the slide bar 252 to move until the elastic force of the spring 255 is greater than the friction force exerted on the slider 23, and the linkage rod 24 continues to move to drive the slider 23 to move forward and be stuck in the card slot 31. At this time, the control linkage rod 24 continues to move, so that the spring 255 is further compressed, so that the card block 251 is more tightly connected in the card slot 31 through the elastic force of the spring 255, thereby ensuring the stability of the card block 251 in the locked state.

[0064] Further, such as Figure 6 As shown, the outer surface of the first end of the locking block 251 in the sliding direction is set to be an inclined surface to form a wedge block 256.

[0065] When the block 251 is inserted into the slot 31, the inclined surface of the wedge block 256 makes the block 251 inserted deeper into the slot 31, and the door body 1 and the door frame 3 fit more tightly, which is more conducive to ensuring the airtightness of the box. In other embodiments, the first end of the block 251 can also be set as a common rectangular block.

[0066] like Figure 7 and Figure 8 , the structure of the door frame 3 of this embodiment is specifically as follows:

[0067] The outer surface of the door frame 3 is provided with a sealing groove 32 along its edge, and a sealing ring 33 is embedded in the sealing groove 32. The inner edge of the inner surface of the door frame 3 is provided with a mounting groove, and a rectangular clamping ring 34 is fixed in the mounting groove. The rectangular clamping ring 34 surrounds the clamping groove 31.

[0068] This door frame 3 structure ensures airtightness when the door body 1 and door frame 3 are in contact with each other through the sealing ring 33. The rectangular clamping ring 34 forming the retaining groove 31 simplifies the processing of the door frame 3 and allows for replacement of the retaining groove 31 when it wears out over time. In other embodiments, the door frame 3 can also be airtight using a silicone gasket or other structure; the retaining groove 31 can also be integrally formed on the inner wall of the door frame 3.

[0069] In addition, if Figure 2 and Figure 3 As shown, this embodiment is further provided with a handle 4 and a lock slot 151:

[0070] The outer end of the rotating shaft 11 is hinged with a handle 4 and the hinge axis is arranged horizontally. The outer surface of the door body 1 is provided with a locking groove 151. When the buckle 25 is in the locked state, the handle 4 can be locked in the locking groove 151 by rotating.

[0071] After the rotation of the shaft 11 is completed by the handle 4, the handle 4 can be rotated into the locking groove 151 to be locked, so as to maintain the locking state of the buckle 25, thereby ensuring the reliability of the end door being closed.

[0072] Among them, Figure 4 As shown, the structure of the handle 4 is specifically as follows:

[0073] The handle 4 includes a grip portion 41 and a telescopic rod 42 formed by an inner slide rod 421 and an outer sleeve 422. One end of the telescopic rod 42 is hinged to the outer end of the rotating shaft 11, and the other end is fixedly connected to the grip portion 41. An elastic member 423 is connected between the inner slide rod 421 and the outer sleeve 422. The elastic member 423 is suitable for driving the grip portion 41 to abut against the groove wall of the lock groove 151 when the handle 4 is clamped in the lock groove 151.

[0074] Specifically, such as Figure 4 As shown, the inner slide rod 421 is connected to the outer end of the rotating shaft 11, and the outer sleeve 422 is connected to the hand grip 41. The inner slide rod 421 is provided with a sliding hole 4211 arranged along its length, and a sliding pin 4221 is fixed to the outer sleeve 422, and the sliding pin 4221 is placed in the sliding hole 4211. The inner slide rod 421 is a hollow rod, and a limit pin 4212 is fixed to the end away from the rotating shaft 11. The elastic member 423 is a compression spring, which is pressed between the sliding pin 4221 and the limit pin 4212. Of course, as an alternative embodiment, the outer sleeve 422 can also be connected to the outer end of the rotating shaft 11, and the inner slide rod 421 can be connected to the hand grip 41.

[0075] Specifically, such as Figure 4As shown, the grip portion 41 includes a web 411 and two wing rods 412. The web 411 is perpendicular to the telescopic rod 42, and the two wing rods 412 are symmetrically distributed on both sides of the web 411, and the wing rods 412 form an obtuse angle with the web 411. Of course, as an alternative embodiment, the grip portion 41 may include only the web 411, or may be spherical or other common shapes.

[0076] With this handle 4 structure, when the buckle 25 is in the locked state, the handle 4 is placed in the lock groove, and the hand grip 41 abuts against the groove wall of the lock groove under the elastic force of the elastic member 423, which can effectively prevent the hand grip 41 from falling off from the lock groove, thereby ensuring the reliability of the end door closing.

[0077] The working principle of the connecting rod structure sealing end door of this embodiment is as follows.

[0078] When the end door needs to be closed, it is divided into the following steps:

[0079] S1. Snap the door 1 and door frame 3 together;

[0080] S2. The crank 21 is rotated by rotating the shaft 11 through the handle 4. The crank 21 drives the connecting rod 22 to rotate, and the connecting rod 22 drives the slide to slide in the up and down directions, thereby driving the linkage rod 24 to rotate, thereby driving the buckle 25 to slide along the door body 1, and finally the buckle 25 is snapped into the slot 31;

[0081] S3. Rotate the handle 4 into the locking slot 151 and lock it by compressing the spring.

[0082] When the end door needs to be closed, it is divided into the following steps:

[0083] S1. Remove the handle 4 from the lock slot 151;

[0084] S2. The crank 21 is rotated by rotating the shaft 11 through the handle 4. The crank 21 drives the connecting rod 22 to rotate. The connecting rod 22 drives the slide to slide in the up and down directions, thereby driving the linkage rod 24 to rotate, thereby driving the buckle 25 to slide along the door body 1, and finally disengaging the buckle 25 from the slot 31;

[0085] S3. Separate the door frame 3 from the door body 1.

[0086] It should be noted that the door body 1 and the door frame 3 can be hinged or separated and fastened, or other commonly used door structures can be used. Example 2

[0087] This embodiment provides a packaging box, including a box body, which is provided with the connecting rod structure sealing end door described in Example 1.

[0088] It should be noted that during installation, the door frame 3 is located on the inner side and fixed at the opening of the box body, and the door body 1 is located on the outer side and buckled onto the door frame 3.

[0089] The above is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions have been made with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents; and such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the technical solutions of the embodiments, and they should all be covered by the scope of protection of the claims.

Claims

1. A connecting rod structure sealed end door, characterized in that: include: The door body (1) has a rotating shaft (11) inserted through the center of its surface; A connecting rod mechanism (2), comprising a crank (21), wherein the middle portion of the crank (21) is fixedly sleeved on the inner end of the rotating shaft (11), and both ends of the crank (21) are sequentially connected to connecting rods (22) and sliders (23) to form two sets of crank (21) and sliders (23) mechanisms symmetrically distributed up and down, wherein the sliders (23) are slidably connected to the inner surface of the door body (1) and the sliding direction is up and down, and the left and right sides of the sliders (23) are both hinged to linkage rods (24), and the ends of the linkage rods (24) away from the sliders (23) are hinged to at least one set of buckles (25), and the buckles (25) are slidably connected to the inner surface of the door body (1), and the buckles (25) on the left and right sides of the sliders (23) are symmetrically distributed; A door frame (3), the inner side wall of which is provided with a card slot (31), the card slot (31) being adapted to fit the card buckle (25); The buckle (25) has a locked state in which it is engaged in the slot (31) and a free state in which it is separated from the slot (31); when the buckle (25) is in the locked state, the door body (1) and the door frame (3) are sealed together; and the buckle (25) is switched between the locked state and the free state by rotating the rotating shaft (11); The outer end of the rotating shaft (11) is hinged with a handle (4) and the hinge axis is arranged horizontally. The outer surface of the door body (1) is provided with a lock groove (151). When the buckle (25) is in a locked state, the handle (4) can be locked in the lock groove (151) by rotating; the handle (4) includes a hand grip (41) and a telescopic rod (42) formed by an inner slide rod (421) and an outer sleeve (422). One end of the telescopic rod (42) is hinged to the outer end of the rotating shaft (11) and the other end is fixedly connected to the hand grip (41). An elastic member (423) is connected between the inner slide rod (421) and the outer sleeve (422). The elastic member (423) is suitable for being locked in the lock groove (151) when the handle (4) is locked. 1) When the inner sliding rod (421) is in engagement with the outer end of the rotating shaft (11), the outer sleeve (422) is connected to the hand gripping portion (41), a sliding hole (4211) arranged along the length direction of the inner sliding rod (421) is provided, a sliding pin (4221) is fixed on the outer sleeve (422), the sliding pin (4221) is placed in the sliding hole (4211), the inner sliding rod (421) is a hollow rod, and a limiting pin (4212) is fixed at one end away from the rotating shaft (11), the elastic member (423) is a compression spring, and the compression spring is pressed between the sliding pin (4221) and the limiting pin (4212).

2. The connecting rod structure sealed end door according to claim 1, characterized in that: The end of the linkage rod (24) away from the slider (23) is hinged with two sets of buckles (25), wherein one set of buckles (25) slides in a left-right direction relative to the door body (1), and the other set of buckles (25) slides in an up-down direction relative to the door body (1).

3. The connecting rod structure sealed end door according to claim 2, characterized in that: The buckle (25) comprises: a clamping block (251) slidably connected to the inner surface of the door body (1); a first end of the clamping block (251) in the sliding direction is adapted to be clamped in the clamping slot (31); and a mounting window is provided in the middle of the clamping block (251); A slide bar (252) is slidably inserted into the block (251) and is parallel to the sliding direction of the block (251); a first end of the slide bar (252) extends into the installation window and is fixed with an anti-slip component (253); the anti-slip component (253) is suitable for preventing the slide bar (252) from escaping from the installation window; a second end of the slide bar (252) extends outward from the second end of the block (251) in the sliding direction; a limiting component (254) is fixed to the second end of the slide bar (252) and is hinged to the linkage rod (24); A spring (255) is sleeved on the slide rod (252) and is located between the clamping block (251) and the limiting member (254).

4. The connecting rod structure sealed end door according to claim 3, characterized in that: The outer surface of the first end of the clamping block (251) in the sliding direction is set as an inclined surface to form a wedge block (256).

5. The connecting rod structure sealed end door according to claim 1, characterized in that: The outer surface of the door frame (3) is provided with a sealing groove (32) along its edge, a sealing ring (33) is embedded in the sealing groove (32), and the inner edge of the inner surface of the door frame (3) is provided with a mounting groove, a rectangular clamping ring (34) is fixed in the mounting groove, and the rectangular clamping ring (34) surrounds the clamping groove (31).

6. The connecting rod structure sealed end door according to claim 1, characterized in that: The inner surface of the door body (1) is provided with guide blocks (12) arranged opposite to each other on the left and right, and a sliding groove arranged up and down is formed between the two guide blocks (12). The end of the slider (23) away from the rotating shaft (11) is slidably connected in the sliding groove. The inner surface of the door body (1) is also provided with a strip guide rail (13). The strip guide rail (13) is arranged up and down and is located on the side of the sliding groove facing the rotating shaft (11). The end of the slider (23) close to the rotating shaft (11) is slidably connected to the strip guide rail (13), and the side wall of the end of the slider (23) close to the rotating shaft (11) is hinged to the linkage rod (24).

7. A packaging box, characterized in that: The invention comprises a box body provided with a sealing end door of a connecting rod structure according to any one of claims 1 to 6.

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