A new type of can body pop-off cap

Abstract

The utility model belongs to the field of zip -top, specifically relates to a novel tank zip -top, including zip -top body, and the zip -top body includes the fixed cover body of installation in the zip -top top opening, is provided with the opening on the fixed cover body, is provided with the connecting cover in the opening, the bottom of connecting cover is provided with the mechanism of opening a lid for overturning connecting cover, is provided with the locking mechanism for locking connecting cover overturning on the fixed cover body, is provided with zip -top body at the opening of zip -top, and the cooperation of the mechanism of opening a lid and locking mechanism on zip -top body can open and close freely to the opening of zip -top, and improves protection for some food or beverage that need to eat in several times.

Description

Technical Field

[0001] This utility model belongs to the field of easy-open lid technology, specifically relating to a novel easy-open lid for cans. Background Technology

[0002] As a convenient can opening and sealing device, the aluminum can has been widely used in the packaging of food and beverages since its inception. Early aluminum can lids were mainly made of metal and used a simple pull ring structure to achieve the opening function. With continuous technological advancements, the design and manufacturing process of aluminum can lids have gradually improved, resulting in various types of aluminum can lids, such as full-opening aluminum can lids and flap-type aluminum can lids, to meet the packaging needs of different products.

[0003] Currently, the mainstream easy-open lids on the market are still mainly made of metal, especially aluminum, which has become the preferred choice for many beverage and food packaging products due to its good strength, sealing properties, and processability. However, existing aluminum easy-open lids are generally disposable. Once opened by the pull ring, the lid deforms and cannot be resealed, making it impossible to store unfinished beverages in the can for a long time. This is inconvenient for foods or beverages that need to be consumed multiple times. If consumers do not finish the product after opening, the remaining product is easily contaminated, affecting its quality and safety. Summary of the Invention

[0004] I. Technical problems to be solved

[0005] This utility model addresses the aforementioned deficiencies in existing technologies by proposing a novel can lid. The lid body is located at the opening of the can, and through the cooperation of an opening mechanism and a locking mechanism on the lid body, the opening of the lid can be freely opened and closed. This solves the problem that existing aluminum lids are generally disposable, and that after being opened by the pull ring, the lid deforms and cannot be resealed, thus preventing the long-term preservation of uneaten beverages inside the can.

[0006] II. Technical Solution

[0007] To solve the above-mentioned technical problems, this utility model provides a novel easy-open can lid, including an easy-open can lid body. The easy-open can lid body includes a fixed lid body installed at the top opening of the easy-open can, a movable bottom lid hinged to the bottom of the fixed lid body, and an opening provided on the fixed lid body. An opening mechanism is provided in the opening.

[0008] The opening mechanism includes a pull ring body and a rotating shaft located on the pull ring body; the upper part of the movable bottom cover is provided with a hinge seat, and the rotating shaft can rotate within the hinge seat. When the pull ring body is lifted upward to make it rotate around the rotating shaft, the pull ring body can push the movable bottom cover downward to open the easy-open cover.

[0009] The fixed cover is equipped with a locking mechanism to prevent the cover opening mechanism from flipping.

[0010] The fixed cover includes an upper cover and a lower cover, which are respectively located at the top and bottom of the opening of the tank. The upper cover and the lower cover are fixedly connected, and the movable bottom cover is hinged to the lower cover.

[0011] The rotating shaft is located on both sides of the pull ring body, and the hinge seat is located on the upper part of the movable bottom cover and is provided in two, respectively cooperating with the rotating shaft on both sides of the pull ring body.

[0012] The hinge seat has an elliptical groove inside, into which the rotating shaft is inserted and slidably connected.

[0013] The locking mechanism includes a slide groove on both sides of the opening, and sliding blocks matching the slide groove are provided on both sides of the outer end of the pull ring body. One end of the slide groove is provided with an outlet for the sliding blocks to enter and exit.

[0014] The pull ring body is fixedly provided with a connecting cover on the upper part, and a number of connectable wires that can be pulled off are provided between the connecting cover and the upper cover body.

[0015] Both the connecting cover and the top cover are made of plastic.

[0016] The connecting cover has a through hole, and the pull ring body has a fixing post that matches the through hole. The fixing post is engaged with the through hole to achieve fixation.

[0017] The connecting cover is equipped with an unlocking indicator and a locking indicator. The unlocking indicator is located on the end of the connecting cover near the pull ring body, and the locking indicator is located on the end of the connecting cover away from the pull ring body.

[0018] In this process, pull the pull ring body a certain distance along the unlocking direction to expose the sliding block. The sliding block no longer restricts the rotation of the pull ring body. At this time, the pull ring body can be lifted upward to make it rotate around the rotation axis, and the movable bottom cover can be pushed down to open the easy-open cover.

[0019] By continuing to rotate the pull ring body to a vertical or near-vertical position, and then slightly pushing the pull ring body downwards, the rotating shaft can move downwards along the groove a certain distance, or the rotating shaft can abut against the bottom of the groove. Rotating the pull ring body in the opposite direction can cause the sliding block to engage with the easy-open cover body, thus fixing it in the open state.

[0020] When it is necessary to close the easy-open lid, it can be done by reversing the operation.

[0021] The movable bottom cover is provided with a first sealing element for sealing between the movable bottom cover and the lower cover body;

[0022] The lower cover is provided with a second sealing element for sealing between the lower cover and the lower part of the top opening of the can.

[0023] The movable bottom cover has a third sealing element in the middle, and the bottom of the pull ring body has a sealing boss corresponding to the third sealing element. The third sealing element has an air hole in the center. When the easy-open cover is closed, the sealing boss abuts against the third sealing element to block the air hole.

[0024] III. Beneficial Effects

[0025] Compared with the prior art, the opening of the can of this utility model is provided with an easy-open lid body. Through the cooperation of the opening mechanism and the locking mechanism on the easy-open lid body, the opening of the easy-open lid can be opened and closed freely, providing protection for some foods or beverages that need to be consumed in multiple portions.

[0026] Specifically, through the coordinated action of the opening mechanism and the locking mechanism, the easy-open cover can be opened and closed multiple times and reliably sealed. The sliding block can be unlocked by sliding along the groove to the outlet. The movable bottom cover can be pushed open by pulling the pull ring body upward. The operation is simple and convenient. The rotating shaft moves down and abuts in the elliptical groove. Rotating the pull ring in the opposite direction can make the sliding block lock into the cover body to achieve the opening position locking.

[0027] Furthermore, it is equipped with triple sealing protection: the first sealing element seals the movable bottom cover and the lower cover body, the second sealing element seals the lower cover body and the tank opening, and the third sealing element cooperates with the sealing boss to block the air hole, ensuring that the liquid is leak-proof and oxidation-proof for a long time;

[0028] It also guides users to operate correctly through the unlock and lock indicators on the connecting cover, avoiding accidental opening and providing safety instructions. Attached Figure Description

[0029] Figure 1 A three-dimensional structural diagram of the installation state of a novel easy-open can lid. Figure 1 .

[0030] Figure 2 A three-dimensional structural diagram of the installation state of a novel easy-open can lid. Figure 2 .

[0031] Figure 3 This is a cross-sectional view of a novel easy-open can lid in its installed state.

[0032] Figure 4 This is a three-dimensional structural diagram of a novel easy-open can lid.

[0033] Figure 5 This is a three-dimensional structural diagram of a novel type of can with an easy-open lid in a closed state.

[0034] Figure 6This is a three-dimensional structural diagram of a novel type of can with an easy-open lid in the open state.

[0035] Figure 7 This is a cross-sectional view of a novel easy-open can lid.

[0036] Figure 8 A three-dimensional structural breakdown of a novel easy-open can lid. Figure 1 .

[0037] Figure 9 A three-dimensional structural breakdown of a novel easy-open can lid. Figure 2 .

[0038] Figure 10 This is a three-dimensional structural diagram of a novel easy-open can lid with a can body.

[0039] Figure 11 This is a structural rendering of the lower cover, movable bottom cover, and sealing element of a novel easy-open can lid.

[0040] In the picture:

[0041] 1 is the easy-open lid body; 2 is the fixed lid body; 21 is the upper lid body; 22 is the lower lid body; 3 is the opening; 4 is the connecting lid; 41 is the through hole; 42 is the unlocking indicator; 43 is the locking indicator; 5 is the lid opening mechanism; 51 is the hinge seat; 511 is the groove; 52 is the rotating shaft; 53 is the pull ring body; 531 is the sliding block; 532 is the fixed post; 6 is the locking mechanism; 61 is the slide groove; 611 is the outlet; 7 is the connecting line; 8 is the movable bottom cover; 9 is the first seal; 10 is the second seal; 11 is the third seal; 12 is the sealing boss; 13 is the vent; 14 is the inclined surface; 100 is the easy-open can. Detailed Implementation

[0042] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but should not be used to limit the scope of this utility model. Example

[0043] Combination Figure 1 , Figure 2 and Figure 10 As shown, the easy-open lid of this embodiment includes a fixed lid body 2 installed at the top opening of the easy-open can 100, a movable bottom cover 8 hinged to the bottom of the fixed lid body 2, an opening 3 on the fixed lid body 2, and an opening mechanism 5 inside the opening 3.

[0044] The opening mechanism 5 includes a pull ring body 53 and a rotating shaft 52 located on the pull ring body 53; the upper part of the movable bottom cover 8 is provided with a hinge seat 51, and the rotating shaft 52 can rotate within the hinge seat 51. When the pull ring body 53 is lifted upward to rotate around the rotating shaft 52, the pull ring body 53 can push the movable bottom cover 8 downward to open the easy-open cover; the fixed cover body 2 is provided with a locking mechanism 6 for preventing the opening mechanism 5 from flipping.

[0045] This utility model proposes a novel can lid, mainly composed of a lid body 1, which is installed at the top opening of the can to achieve sealing and opening functions. The fixing lid body 2 is the part of the lid body 1 installed at the top opening of the can, serving as a basic fixing function. An opening 3 is provided on the lid body 2, providing a channel space for the subsequent installation of the pull ring body 53 and for the outflow of substances from the can.

[0046] The movable bottom cover 8 is hinged to the fixed cover 2, allowing the movable bottom cover 8 to rotate at a certain angle relative to the fixed cover 2. Specifically, the fixed cover 2 includes an upper cover 21 and a lower cover 22, which are respectively located at the top and bottom of the opening of the tank. The upper cover 21 and the lower cover 22 are fixedly connected. The movable bottom cover 8 is hinged to the lower cover 22. The movable bottom cover 8 is provided with a first sealing element 9. The function of the first sealing element 9 is to enhance the sealing performance between the movable bottom cover 8 and the fixed cover 2 when they are closed, preventing leakage of substances inside the tank. A connecting cover 4 is fixedly provided on the upper part of the pull ring body 53. The two can be regarded as one piece. A through hole 41 is provided on the connecting cover 4, and a fixing post 532 matching the through hole 41 is provided on the pull ring body 53. The through hole 41 extends through the thickness direction of the connecting cover 4, providing space for the insertion of the fixing post 532, thus fixing the two together. The pull ring body 53 is located inside the opening 3 of the fixing cover 2, and its shape and size should be adapted to the opening 3 so that it can be installed at the opening 3 and realize the function of opening and closing the opening 3. That is, the rotation of the pull ring body 53 can be transmitted to the movable bottom cover 8, thereby driving the movable bottom cover 8 to flip, realizing the opening or closing of the opening 3.

[0047] The locking mechanism 6 is installed on the fixed cover 2 to prevent the pull ring body 53 from flipping. When the easy-open cover does not need to be opened, the locking mechanism 6 fixes the pull ring body 53 in the closed opening 3 position to prevent the pull ring body 53 from accidentally flipping and causing leakage of the contents of the can; when it needs to be opened, the locking mechanism 6 is released from locking the pull ring body 53 by a specific operation, so that the pull ring body 53 can be flipped freely.

[0048] When not opened, the movable bottom cover 8 is hinged to the fixed cover 2 and remains in a relatively fixed position. The first sealing element 9 ensures a good seal between the movable bottom cover 8 and the fixed cover 2. At the same time, the locking mechanism 6 locks the pull ring body 53, fixing it in the closed opening 3 position to prevent the contents of the can from leaking through the opening 3. At this time, the entire easy-open cover is in a sealed state, protecting the contents of the can.

[0049] When it is necessary to open the easy-open lid, first release the locking mechanism 6 from locking the pull ring body 53. Then, rotate the pull ring body 53 by external force. Since the pull ring body 53 is connected to the bottom of the lid opening mechanism 5, the rotation of the pull ring body 53 will drive the lid opening mechanism 5 to move, which in turn will cause the connection between the movable bottom cover 8 and the fixed cover 2 to flip, so that the opening 3 opens and the contents of the can can flow out through the opening 3.

[0050] If it is necessary to close the opening again after opening, rotate the pull ring body 53 in the opposite direction. The pull ring body 53 drives the movable bottom cover 8 to flip in the opposite direction through the opening mechanism 5, so that the movable bottom cover 8 closes the opening 3 again. Then the locking mechanism 6 locks the pull ring body 53 again, restoring the sealed state.

[0051] Combination Figures 3-9 As shown, the opening mechanism 5 includes hinge seats 51 on both sides of the top of the movable bottom cover 8. A rotating shaft 52 is provided inside the hinge seat 51. A pull ring body 53 is connected to the rotating shaft 52. The top of the pull ring body 53 is fixedly connected to the connecting cover 4.

[0052] Specifically, the opening mechanism 5 is a device used to flip the pull tab body 53, thereby controlling the opening and closing of the can. The hinge seats 51 are located on both sides of the top of the movable bottom cover 8. These two hinge seats 51 provide basic support and positioning structure for the entire opening mechanism 5, and are fixed to the movable bottom cover 8 to ensure the stability of subsequent component installation.

[0053] The rotating shaft 52 is installed inside the hinge base 51. The rotating shaft 52 is the core rotating component of the cover opening mechanism 5. It can rotate freely within the hinge base 51, providing the rotation axis for the movement of the entire mechanism, so that other components connected to it can rotate around it.

[0054] The pull ring body 53 is connected to the rotating shaft 52. One end of the pull ring body 53 is fitted onto the rotating shaft 52 and can rotate with the rotating shaft 52. The pull ring body 53 plays the role of transmitting force. When an external force is applied to the pull ring body 53, it will rotate around the rotating shaft 52, thereby driving the movement of other related components.

[0055] Combination Figure 4 , Figure 7 , Figure 8 and Figure 9As shown, the hinge seat 51 has an elliptical groove 511 inside. The rotating shaft 52 is inserted into the groove 511 and slidably connected therein. Specifically, the hinge seat 51 is the basic support component of the cover opening mechanism 5, and is located on both sides of the opening 3. Its interior has a key structure—an elliptical or waist-shaped groove 511. This groove 511 provides space for the installation and movement of the rotating shaft 52, allowing the pull ring body 53 to rotate and hinge in the groove 511 while also moving a certain distance along the length of the groove 511. At the same time, corresponding inclined surfaces 14 for easy installation are provided on the upper part of the hinge seat 51 and the lower part of the rotating shaft 52.

[0056] The locking mechanism 6 includes grooves 61 on both sides of the opening 3, and sliding blocks 531 matching the grooves 61 are provided on both sides of the outer end of the pull ring body 53. Specifically, the locking mechanism 6 is a key part of the new type of can easy-open lid used to control the flipping of the pull ring body 53 to open or close the can. The grooves 61 are located on both sides of the opening 3. The grooves 61 have a long strip structure, providing a sliding track for the sliding blocks 531 at the outer end of the pull ring body 53, and are an important spatial limiting component for the locking mechanism 6 to realize its function.

[0057] Sliding blocks 531 are installed on both sides of the outer end of the pull ring body 53. The shape and size of the sliding blocks 531 match the slide groove 61, allowing them to slide smoothly within the slide groove 61. The sliding blocks 531 are fixedly connected to the pull ring body 53, and through their own sliding, they drive the pull ring body 53 and the connected cover 4 to perform corresponding actions. They are key components for transmitting motion in the locking mechanism 6.

[0058] When the can is in its normally closed, unopened state, the sliding blocks 531 on both sides of the outer end of the pull ring body 53 are located at specific positions in the groove 61, typically close to the inside of the can, preventing the pull ring body 53 from rotating upwards. At this time, because the sliding blocks 531 are blocked by the structure of the groove 61, the pull ring body 53 cannot rotate upwards around the rotation axis 52, thus preventing the connecting cap 4, which is fixedly connected to the top of the pull ring body 53, from rotating, effectively sealing the opening 3 and preventing leakage of the contents of the can.

[0059] When it is necessary to open a can, the operator holds the pull tab body 53 and applies a pulling force in a specific direction. Under this pulling force, the sliding block 531 begins to slide within the groove 61. As the pulling force continues, the sliding block 531 moves along the trajectory of the groove 61, gradually disengaging from the locked position, generally when the sliding block 531 comes into view. When the sliding block 531 slides to a position in the groove 61 that allows the pull tab body 53 to flip upwards, the pull tab body 53 can then rotate upwards and flip around the rotation axis 52.

[0060] One end of the chute 61 is provided with an outlet 611 for the sliding block 531 to enter and exit. Specifically, the outlet 611 is located at one end of the chute 61 and is an inlet / outlet specifically designed for the sliding block 531 to enter and exit the chute 61. The size of the outlet 611 is adapted to the sliding block 531 to ensure that the sliding block 531 can pass smoothly, while not being too large to cause the sliding block 531 to accidentally dislodge when not in operation. When the can is in its normal closed state and unopened, the sliding block 531 is located at the end of the chute 61 away from the outlet 611. At this time, the inner wall of the chute 61 restricts the sliding block 531, preventing it from moving, and thus preventing the pull ring body 53 from rotating upward around the rotation axis 52.

[0061] When the contents of the can are used up or when the can needs to be temporarily sealed, the operator presses the connecting cap 4 downwards. The connecting cap 4 causes the pull ring body 53 to rotate downwards, while simultaneously moving the sliding block 531 towards the groove 61. When the sliding block 531 reaches the outlet 611 again, continued pressing will cause the sliding block 531 to enter the groove 61 through the outlet 611 and slide along the groove 61 to the initial locking position away from the outlet 611. At this point, the pull ring body 53 is again restricted from flipping upwards, and the connecting cap 4 tightly seals the opening 3 again, returning the can to the locked state.

[0062] Regarding the sealing of the easy-open lid of the can, such as Figure 11 As shown, a first sealing element 9 is provided on the upper part of the movable bottom cover 8 for sealing between the movable bottom cover 8 and the lower cover body 22. The first sealing element 9 is annular and made of soft rubber or silicone.

[0063] The lower cover 22 is provided with a second sealing element 10 for sealing between the lower cover 22 and the lower part of the top opening of the can. The second sealing element 10 is annular and made of soft rubber or silicone.

[0064] The movable bottom cover 8 has a third sealing element 11 in the middle, and the pull ring body 53 has a sealing boss 12 corresponding to the third sealing element 11 at the bottom. The third sealing element has an air hole 13 in the center. When the easy-open cover is closed, the sealing boss 12 abuts against the third sealing element 11 to block the air hole 13. Generally, when an easy-open can is filled with carbonated beverages, the inside is under a certain degree of high pressure, and the movable bottom cover 8 is also pressed upward against the can. To push it down, it is necessary to release the pressure in advance. When the pull ring body 53 is pulled horizontally outward, even if the sliding block 531 is disengaged from the locking position, the sealing boss 12 and the third sealing element 11 no longer abut against each other, thus exposing the air hole 13 and releasing the pressure, and then it can be opened normally. Example

[0065] Compared to Embodiment 1, in this embodiment, several breakable connecting wires 7 are provided between the connecting cap 4 and the fixed cap 2. These connecting wires 7 are evenly distributed between the connecting cap 4 and the fixed cap 2, with one end fixed to the connecting cap 4 and the other end fixed to the fixed cap 2, connecting the connecting cap 4 and the fixed cap 2 together. This ensures that the connecting cap 4 is initially in the closed opening 3 position, and also allows the user to clearly identify that the can is in an unopened state. Correspondingly, the connecting wires must be broken before the cap opening mechanism can be operated upon first opening. Example

[0066] Compared to Embodiment 1, in this embodiment, the connecting cover 4 is provided with an unlocking indicator 42 and a locking indicator 43. The unlocking indicator is located on the connecting cover 4 at one end near the pull ring of the pull ring body 53, and the locking indicator is located on the connecting cover 4 at one end away from the pull ring of the pull ring body 53. The unlocking and locking indicators on the connecting cover guide the user to operate correctly, avoid accidental opening, and provide safety instructions.

[0067] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A novel easy-open can lid, characterized in that, The new type of can lid includes a lid body (1), the lid body (1) includes a fixed lid (2) installed at the top opening of the can, the bottom of the fixed lid (2) is hinged to a movable bottom cover (8), the fixed lid (2) is provided with an opening (3), and an opening mechanism (5) is provided in the opening (3). The opening mechanism (5) includes a pull ring body (53) and a rotating shaft (52) located on the pull ring body (53); the movable bottom cover (8) is provided with a hinge seat (51) on the upper part, and the rotating shaft (52) can rotate in the hinge seat (51). When the pull ring body (53) is lifted upward to make it rotate around the rotating shaft (52), the pull ring body (53) can push the movable bottom cover (8) downward to open the easy-open cover; The fixed cover (2) is provided with a locking mechanism (6) for preventing the cover opening mechanism (5) from flipping.

2. The novel easy-open can lid according to claim 1, characterized in that, The fixed cover (2) includes an upper cover (21) and a lower cover (22), which are respectively located at the top and bottom of the opening of the tank. The upper cover (21) and the lower cover (22) are fixedly connected, and the movable bottom cover (8) is hinged to the lower cover (22).

3. The novel easy-open can lid according to claim 1, characterized in that, The rotating shaft (52) is located on both sides of the pull ring body (53), and the hinge seat (51) is located on the upper part of the movable bottom cover (8) and is provided in two, respectively cooperating with the rotating shaft (52) on both sides of the pull ring body (53). The hinge seat (51) has an elliptical groove (511) inside, and the rotating shaft (52) is inserted into the groove (511) and slidably connected therein.

4. A novel easy-open can lid according to claim 3, characterized in that, The locking mechanism (6) includes a slide groove (61) on both sides of the opening (3), and a sliding block (531) matching the slide groove (61) is provided on both sides of the outer end of the pull ring body (53). One end of the slide groove (61) is provided with an outlet (611) for the sliding block (531) to enter and exit.

5. A novel easy-open can lid according to claim 2, characterized in that, The upper part of the pull ring body (53) is fixedly provided with a connecting cover (4), and a number of pullable connecting lines (7) are provided between the connecting cover (4) and the upper cover body (21). Both the connecting cover (4) and the upper cover (21) are made of plastic.

6. A novel easy-open can lid according to claim 5, characterized in that, The connecting cover (4) has a through hole (41), and the pull ring body (53) has a fixing post (532) that matches the through hole (41). The fixing post (532) is engaged with the through hole (41) to achieve fixation.

7. A novel easy-open can lid according to claim 5, characterized in that, The connecting cover (4) is provided with an unlocking indicator (42) and a locking indicator (43). The unlocking indicator is located on the connecting cover (4) at one end near the pull ring of the pull ring body (53), and the locking indicator is located on the connecting cover (4) at one end away from the pull ring of the pull ring body (53).

8. A novel easy-open can lid according to claim 7, characterized in that, Pull the pull ring body (53) a distance along the unlocking direction to expose the sliding block (531). The sliding block (531) no longer restricts the rotation of the pull ring body (53). At this time, the pull ring body (53) can be lifted up to rotate around the rotation axis (52), and the movable bottom cover (8) can be pushed down to open the easy-open cover.

9. A novel easy-open can lid according to claim 8, characterized in that, Continue to rotate the pull ring body (53) to make it in a vertical or near-vertical position. At this time, push the pull ring body (53) slightly downward so that the rotating shaft (52) moves downward along the groove (511) a certain distance, or so that the rotating shaft (52) abuts against the bottom of the groove (511). Rotate the pull ring body (53) in the opposite direction so that the sliding block (531) is engaged in the easy-open cover body (1) to achieve the fixation of the open state. When it is necessary to close the easy-open lid, it can be done by reversing the operation.

10. A novel easy-open can lid according to claim 1, characterized in that, The movable bottom cover (8) is provided with a first sealing element (9) for sealing between the movable bottom cover (8) and the lower cover body (22); The lower cover (22) is provided with a second sealing element (10) for sealing between the lower cover (22) and the lower part of the top opening of the can; The movable bottom cover (8) is provided with a third sealing element (11) in the middle. The bottom of the pull ring body (53) is provided with a sealing boss (12) corresponding to the third sealing element (11). The third sealing element has an air hole (13) in the center. When the easy-open cover is closed, the sealing boss (12) abuts against the third sealing element (11) to block the air hole (13).

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