Center top-open type container sealing cover

Abstract

The utility model discloses a center top-open type container sealing cover which comprises a cover body and a top-open structure arranged on the cover body, and the cover body is a shell with an opening in the bottom. A counter bore is formed in the top face of the shell, the ejection structure is located in the counter bore, and the ejection structure comprises an ejection piece located on the back face of the counter bore, a center circular plate located in the middle of the ejection piece and a reinforcing rib connecting the cover body and the ejection structure. A sealing piece is arranged in a gap formed between the counter bore and the cover body, the sealing piece is connected with the inner wall of the top of the cover body, the cover body is integrally formed, production is convenient, and the production cost is reduced. The ejection structure is composed of an ejection sheet and a central circular plate, so that the force required during pressing can be reduced, and unsealing is more convenient; the reinforcing rib is connected with the cover body and the ejection structure, the center circular plate and the ejection piece are pulled after the cover is opened, the center circular plate and the ejection piece are prevented from falling into a container to pollute liquid, and the cover has the advantages of being clean, environmentally friendly and convenient to use.

Description

TECHNICAL FIELD

[0001] The utility model relates to a container sealing cover, in particular to a center top opening type container sealing cover. BACKGROUND

[0002] The Chinese patent document with publication date of August 13, 2008 and publication number of CN201099438Y discloses a top opening type double-layer sealing three-piece plastic anti-fake bottle cover, which comprises a cover and a tearable cover sleeve, the cover and the cover sleeve are connected together, the wall thickness of the connecting point of the cover and the cover sleeve is 1 / 10-3 / 10 of the wall thickness of the side wall of the cover, a ring-shaped concave tear groove is formed between the connecting point of the cover and the cover sleeve, the cover is columnar with a closed top and an open bottom, a columnar concave cavity cooperating with a water dispenser is arranged at the center of the top of the cover, a top breaking piece cooperating with the water dispenser is arranged at the bottom of the columnar concave cavity, the top breaking piece and the side wall of the columnar concave cavity are connected together, the wall thickness of the connecting point of the top breaking piece and the side wall of the columnar concave cavity is 1 / 10-3 / 10 of the wall thickness of the side wall of the columnar concave cavity, and an internal thread for screwing and locking with the mouth of a water storage barrel is arranged on the inner wall of the cover. However, the top breaking piece used in the prior art will probably fall into the container after opening, which can easily pollute the liquid in the container and affect the user experience; in addition, the simple top breaking piece is not easy to open and the liquid flow is affected after opening. SUMMARY

[0003] The utility model discloses a center top opening type container sealing cover, which has the advantages of easy opening and no pollution to the liquid in the container.

[0004] The utility model discloses a center top opening type container sealing cover, which has the advantages of easy opening and no pollution to the liquid in the container.

[0005] As a preferred, the top sheet is in a fan ring structure, the circle of the top sheet coincides with the center of the counterbore; the bottom surface of the counterbore is provided with a center counterbore, and the center counterbore is located at the center of the center circular plate. The top sheet is divided into two parts, which can reduce the force required when opening, concentrate the force on the gap of the top sheet through the elastic force inside the top sheet, improve the opening efficiency, and the concentric design of the center counterbore and the center circular plate can make the center circular plate bear force uniformly when the center counterbore is forced, prevent force loss caused by uneven force of the center circular plate, make the center circular plate provide opening angle uniformly downward, make the opening more uniform, and prevent the problem of uneven opening affecting the use experience.

[0006] As a preferred, the top sheet is in a fan ring structure, the circle of the top sheet coincides with the center of the counterbore; the bottom surface of the counterbore is provided with a center counterbore, and the center counterbore is located at the center of the center circular plate. The top sheet is divided into two parts, which can reduce the force required when opening, concentrate the force on the gap of the top sheet through the elastic force inside the top sheet, improve the opening efficiency, and the concentric design of the center counterbore and the center circular plate can make the center circular plate bear force uniformly when the center counterbore is forced, prevent force loss caused by uneven force of the center circular plate, make the center circular plate provide opening angle uniformly downward, make the opening more uniform, and prevent the problem of uneven opening affecting the use experience.

[0007] As a preferred, the top sheet is in a fan ring structure, the circle of the top sheet coincides with the center of the counterbore; the bottom surface of the counterbore is provided with a center counterbore, and the center counterbore is located at the center of the center circular plate. The top sheet is divided into two parts, which can reduce the force required when opening, concentrate the force on the gap of the top sheet through the elastic force inside the top sheet, improve the opening efficiency, and the concentric design of the center counterbore and the center circular plate can make the center circular plate bear force uniformly when the center counterbore is forced, prevent force loss caused by uneven force of the center circular plate, make the center circular plate provide opening angle uniformly downward, make the opening more uniform, and prevent the problem of uneven opening affecting the use experience.

[0008] As a preferred, the top sheet is in a fan ring structure, the circle of the top sheet coincides with the center of the counterbore; the bottom surface of the counterbore is provided with a center counterbore, and the center counterbore is located at the center of the center circular plate. The top sheet is divided into two parts, which can reduce the force required when opening, concentrate the force on the gap of the top sheet through the elastic force inside the top sheet, improve the opening efficiency, and the concentric design of the center counterbore and the center circular plate can make the center circular plate bear force uniformly when the center counterbore is forced, prevent force loss caused by uneven force of the center circular plate, make the center circular plate provide opening angle uniformly downward, make the opening more uniform, and prevent the problem of uneven opening affecting the use experience.

[0009] As preferred, the sealing member is annular protrusion, the sealing member and the cover side wall form a gap with a width matching the thickness of the container mouth; the outer diameter of the lower end of the sealing member is smaller than the inner diameter of the container mouth, and the outer diameter of the middle part of the sealing member is larger than the inner diameter of the container mouth. The outer diameter of the lower end of the sealing member is smaller than the inner diameter of the container mouth, and the outer diameter of the middle part of the sealing member is larger than the inner diameter of the container mouth, so that the bottle mouth can be clamped on the sealing member during tightening, and the sealing performance is ensured. The sealing member is used to improve the sealing performance by tightly fitting the inner wall of the sealing member with the outer wall of the container bottle mouth, and prevent liquid from leaking out of the bottle mouth.

[0010] As preferred, the inner wall of the cover is provided with internal threads matching the external threads of the container mouth; the internal threads are composed of a plurality of disconnected circular arc protrusions. The internal threads are used to tighten and fix the improved sealing cover on the bottle mouth during installation, and have the advantages of convenient installation and good sealing performance. The reason for the segmented and disconnected internal threads is to prevent liquid from accumulating in the internal threads, so that the liquid can flow out of the gap; in another case, the container stores gas-containing liquid, such as carbonated beverages, etc., and during transportation, due to unavoidable vibration and shaking, the internal gas will be released, increasing the gas pressure in the bottle, and when the cover is opened, the gas can be discharged from the gap, and the sealing cover will not be bounced out at high speed due to excessive gas pressure, causing additional impact.

[0011] As preferred, the inner wall of the bottom of the cover is provided with anti-theft teeth, which are composed of a plurality of protrusions; the anti-theft teeth are uniformly distributed on the inner wall of the bottom of the cover. The anti-theft teeth can be used as part of the packaging, and can play the role of anti-fake and anti-theft, and by being fixed after installation, the difficulty of theft is increased and the probability of theft is reduced.

[0012] The beneficial effects of the present utility model are that the problem of the central top opening type bottle cap that the top piece falls into the container after opening and pollutes the liquid is avoided, the safety is improved, the force required for opening is reduced, and the convenience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a sectional view of a central top opening type sealing container cover of the present utility model.

[0014] Figure 2 is a top view of a central top opening type sealing container cover of the present utility model.

[0015] In the figure: 1. cover, 2. counterbore, 3. top piece, 4. central circular plate, 5. sealing member, 6. central counterbore, 7. top opening line, 8. reinforcing long rib, 9. reinforcing short rib, 10. internal threads, 11. anti-theft teeth. DETAILED DESCRIPTION

[0016] The specific implementation manner of the technical scheme of the present utility model will be further described below by examples and in combination with the drawings.

[0017] Embodiment 1: as shown in Figure 1 and Figure 2 A center top open type sealing container cover, comprising a cover body 1 and a top opening structure provided on the cover body 1, the cover body 1 is an open-bottom shell; the top surface of the shell is provided with a counterbore 2, the top opening structure is located inside the counterbore 2, the top opening structure comprises a top piece 3 located at the back of the counterbore 2 and a center circular plate 4 located at the middle of the top piece 3; the cover body 1 is also provided with a reinforcing rib connected with the top opening structure to prevent the broken pieces from polluting; a gap is formed between the counterbore 2 and the cover body 1, and a sealing element 5 is arranged in the gap, the sealing element 5 is connected with the inner wall of the top of the cover body 1, and the cover body 1 is integrally formed. The top opening structure composed of the top piece 3 and the center circular plate 4 can reduce the force required when pressing, making it more convenient to open; and the reinforcing rib connects the cover body and the top opening structure, and holds the center circular plate and the top piece after opening to prevent them from falling into the container and polluting the liquid. Thus, the present scheme solves the pollution problem caused by the falling of the existing top broken pieces and the opening difficulty problem, and has the advantages of being clean, environmentally friendly and convenient to use.

[0018] The middle of the cover body 1 has a counterbore 2, and the center of the counterbore 2 is provided with a center counterbore 6 for confirming the pressing direction when opening; the center of the center counterbore 6 coincides with the center of the center circular plate 4. The back of the counterbore 2 is the center circular plate 4 and the top piece 3, the number of the top piece 3 is two, the shape of the top piece 3 is half-fan ring, the outer diameter is the same as the diameter of the counterbore 2, the center circular plate 4 is inside the top piece 3, and the diameter is smaller than the inner diameter of the top piece 3. The reinforcing long rib 8 and the reinforcing short rib 9 are located on the same straight line passing through the center of the counterbore 2, the reinforcing short rib 9 is connected from the bottom of the counterbore 2 to the middle of the adjacent top piece 3, and the top piece 3 and the cover body 1 are connected and fixed; the reinforcing long rib 8 connects the center circular plate 4 and the other side of the cover body 1, but the middle of the reinforcing long rib 8 also adheres to the top piece 3 passed through, so as to fix the center circular plate 4 and the top piece 3 on the other side of the cover body 1 at the same time, avoiding the pollution caused by the falling of the broken pieces into the container after opening. That is to say, after the cover body 1 of the container is opened, the reinforcing short rib 9 will connect a top piece 3, the reinforcing long rib 8 will connect the center circular plate 4 and a top piece 3, and in addition, the reinforcing long rib 8 and the reinforcing short rib 9 will also be connected in the counterbore 2 of the cover body 1, so that the center circular plate 4 and the top piece 3 and other structures will not fall into the container, avoiding the pollution of the liquid in the container.

[0019] A top opening line 7 is arranged between the center circular plate 4 and the top piece 3, and the top opening line 7 is a groove lower than the top piece 3 and the center circular plate 4, which can determine the opening path and control the opening shape. Further, the deeper the depth of the groove of the top opening line 7, the lower the opening difficulty, but too deep will cause the thickness of the bottom of the groove to be too low to affect the strength of the cover body 1 during transportation. In the present embodiment, the top opening line 7 is the gap between the circle around the outer periphery of the center circular plate 4 and the top piece 3, and the whole is in the shape of a “middle” character.

[0020] Specifically, when a pressure is applied to the center hole 6 on the center circular plate 4 towards the inner cavity of the container cover (generally, a jacking post is used as the force applying part, and the working end of the jacking post has a radial dimension slightly smaller than the radial dimension of the main body), the top opening line 7 on the side of the center circular plate 4 away from the reinforcing long rib 8 will be preferentially damaged, and a tear opening is generated at this position, and then the tear opening expands along the circumference of the center circular plate 4 until the top opening line around the center circular plate 4 is completely damaged, and then the working end of the jacking post completely opens the center circular plate 4, and the main body of the jacking post is radially and axially extruded to the circular hole formed by the tearing of the center circular plate 4, so that the top opening line 7 between the two top sheets 3 starts to tear, and preferentially tears from the position connected to the center circular plate 4. Similarly, finally, as the jacking post is completely inserted, the top opening line 7 between the top sheet 3 and the bottom of the hole 2 also tears, and finally the top opening lines at the center circular plate 4 and the two top sheets 3 are in a completely torn state, completely opening the container cover.

[0021] Embodiment 2: a center top opening type sealing container cover as shown in Figure 1 and Figure 2 , comprising a cover body 1 and a top opening structure provided on the cover body 1, wherein the cover body 1 is an open-bottom shell; the top surface of the shell is provided with a hole 2, and the top opening structure is located inside the hole 2; the top opening structure comprises a top sheet 3 located on the back of the hole 2 and a center circular plate 4 located in the middle of the top sheet 3; the cover body 1 is further provided with a reinforcing rib connected to the top opening structure to prevent the broken pieces from contaminating; a gap is formed between the hole 2 and the cover body 1, and a sealing element 5 is arranged in the gap; the sealing element 5 is connected to the inner wall of the top of the cover body 1; and the cover body 1 is integrally formed. The top opening structure composed of the top sheet 3 and the center circular plate 4 can reduce the force required when pressing, making it easier to open; and the reinforcing rib connects the cover body and the top opening structure, and holds the center circular plate and the top sheet after opening to prevent them from falling into the container and contaminating the liquid. Thus, the present solution solves the problems of contamination caused by the falling of the broken pieces and the difficulty of opening, and has the advantages of being clean, environmentally friendly and easy to use.

[0022] The middle of the cover body 1 has a counterbore 2, and the center of the counterbore 2 is provided with a center counterbore 6 for confirming the pressing direction when opening; the center counterbore 6 coincides with the center of the center circular plate 4. The back of the counterbore 2 is the center circular plate 4 and the top sheet 3, and the number of the top sheet 3 is two. The top sheet 3 is shaped as a half-fan ring, and the outer diameter is the same as the diameter of the counterbore 2. The center circular plate 4 is inside the top sheet 3, and the diameter is smaller than the inner diameter of the top sheet 3. The reinforcing long ribs 8 and the reinforcing short ribs 9 are located on the same straight line passing through the center of the counterbore 2. The reinforcing short ribs 9 are connected from the bottom of the counterbore 2 to the middle of the adjacent top sheet 3, and the top sheet 3 and the cover body 1 are connected and fixed. The reinforcing long ribs 8 connect the center circular plate 4 and the other side of the cover body 1, but the middle of the reinforcing long ribs 8 also adheres to the top sheet 3 passed by, and the center circular plate 4 and the top sheet 3 are fixed on the other side of the cover body 1 at the same time, avoiding the broken pieces falling into the container after opening to cause pollution. That is to say, after the container cover body 1 is opened, the reinforcing short ribs 9 will connect a top sheet 3, and the reinforcing long ribs 8 will connect the center circular plate 4 and a top sheet 3. In addition, the reinforcing long ribs 8 and the reinforcing short ribs 9 will also be connected in the counterbore 2 of the cover body 1, so that the center circular plate 4 and the top sheet 3 and other structures will not fall into the container, avoiding the pollution of the liquid in the container.

[0023] The center circular plate 4 and the top sheet 3 are provided with a top opening line 7, which is a groove lower than the top sheet 3 and the center circular plate 4. The groove can determine the opening path, so that the opening shape can be controlled. Further, the deeper the depth of the groove of the top opening line 7, the lower the opening difficulty, but too deep will cause the thickness of the bottom of the groove to be too low to affect the strength of the cover body 1 during transportation. In this embodiment, the top opening line 7 is the gap between the circle around the outer periphery of the center circular plate 4 and the top sheet 3, and the whole is in the shape of a "middle" character.

[0024] Specifically, when the pressure is applied to the center counterbore 6 on the center circular plate 4 towards the inner cavity of the container cover (generally, a jacking column is used as a force applying part, and the radial dimension of the working end of the jacking column is slightly smaller than the radial dimension of the main body), the top opening line 7 on the side of the center circular plate 4 away from the reinforcing long ribs 8 will be damaged first, and a tear opening will be generated at this position, then the tear opening will expand along the circumference of the center circular plate 4 until the top opening line around the center circular plate 4 is completely damaged, then the working end of the jacking column completely opens the center circular plate 4, and the main body part of the jacking column produces radial and axial extrusion on the circular hole formed by the tearing of the center circular plate 4, so that the top opening line 7 between the two top sheets 3 begins to tear, and tears from the position connected with the center circular plate 4 first. Similarly, finally, as the jacking column is completely deepened, the top opening line 7 between the top sheet 3 and the bottom of the counterbore 2 also tears, and finally the top opening lines at the center circular plate 4 and the two top sheets 3 are in a completely torn state, and the container cover is completely opened.

[0025] The lower end of the seal 5 inside the cover 1 is narrow, and the middle part has a protrusion, and the whole is a flat bottom sheet with a protruding middle part. The lower part of the seal 5 is used to fit with the inside of the container mouth, and after tightening, the container mouth is clamped between the middle protruding part and the lower end, improving the sealing of the container.

[0026] Embodiment 3: as shown in Figure 1 and Figure 2 A center top opening type sealing container cover, including a cover 1 and a top opening structure provided on the cover 1, the cover 1 is an open-bottom shell; the top surface of the shell is provided with a counterbore 2, and the top opening structure is located inside the counterbore 2; the top opening structure includes a top sheet 3 located at the back of the counterbore 2 and a center circular plate 4 located in the middle of the top sheet 3; the cover 1 is also provided with a reinforcing rib connected with the top opening structure to prevent the pollution of the broken sheet; a gap is formed between the counterbore 2 and the cover 1, and a seal 5 is arranged in the gap; the seal 5 is connected with the inner wall of the top of the cover 1; the cover 1 is integrally formed. The top opening structure composed of the top sheet 3 and the center circular plate 4 can reduce the force required when pressing, making it more convenient to open; and the reinforcing rib connects the cover and the top opening structure, and holds the center circular plate and the top sheet after opening to prevent them from falling into the container and polluting the liquid. Thus, the present scheme solves the pollution problem caused by the falling of the existing top broken sheet and the opening difficulty problem, and has the advantages of clean, environmental protection and convenient use.

[0027] The cover 1 has a counterbore 2 in the middle, and a center counterbore 6 is arranged at the center of the counterbore 2 for confirming the pressing direction when opening; the center of the center counterbore 6 coincides with the center of the center circular plate 4. The back of the counterbore 2 is the center circular plate 4 and the top sheet 3, the number of the top sheet 3 is two, and the shape of the top sheet 3 is half-fan ring shape, the outer diameter is the same as the diameter of the counterbore 2, the center circular plate 4 is inside the top sheet 3, and the diameter is smaller than the inner diameter of the top sheet 3. The reinforcing long rib 8 and the reinforcing short rib 9 are located on the same straight line passing through the center of the counterbore 2, the reinforcing short rib 9 is connected from the bottom of the counterbore 2 to the middle of the adjacent top sheet 3, and the top sheet 3 and the cover 1 are connected and fixed; the reinforcing long rib 8 connects the center circular plate 4 and the other side of the cover 1, but the middle part of the reinforcing long rib 8 also adheres to the top sheet 3 passing through it, so as to fix the center circular plate 4 and the top sheet 3 on the other side of the cover 1 at the same time, avoiding the pollution caused by the falling of the broken sheet into the container after opening. That is to say, after the cover 1 of the container is opened, the reinforcing short rib 9 will connect a top sheet 3, and the reinforcing long rib 8 will connect the center circular plate 4 and a top sheet 3, in addition, the reinforcing long rib 8 and the reinforcing short rib 9 will also be connected in the counterbore 2 of the cover 1, so that the center circular plate 4 and the top sheet 3 and other structures will not fall into the container, avoiding the pollution of the liquid in the container.

[0028] The top opening line 7 is a groove lower than the top sheet 3 and the center circular plate 4, which can determine the opening path and enable the opening shape to be controlled. Further, the deeper the depth of the top opening line 7 groove, the lower the opening difficulty, but too deep will result in the thickness of the groove bottom being too low to affect the strength of the cover 1 during transportation. In the embodiment, the top opening line 7 is a gap between the circle around the outer periphery of the center circular plate 4 and the top sheet 3, which is in the shape of a "middle" character as a whole.

[0029] Specifically, when a pressure is applied toward the inner cavity of the container cover at the position of the center counterbore 6 on the center circular plate 4 (generally, a jacking post is used as the force applying part, and the radial dimension of the working end of the jacking post is slightly smaller than the radial dimension of the main body thereof), the top opening line 7 on the side of the center circular plate 4 away from the reinforcing long ribs 8 will be preferentially damaged, and a tear opening is generated at this position, and then the tear opening expands along the circumference of the center circular plate 4 until the top opening line around the center circular plate 4 is completely damaged, and then the working end of the jacking post completely opens the center circular plate 4, the main body part of the jacking post produces radial and axial extrusion on the circular hole formed by the tearing of the center circular plate 4, so that the top opening line 7 between the two top sheets 3 begins to tear, and preferentially tears from the position connected with the center circular plate 4. Similarly, finally, as the jacking post is completely deepened, the top opening line 7 between the top sheet 3 and the bottom of the counterbore 2 also tears, and finally the top opening lines at the center circular plate 4 and the two top sheets 3 are all in a completely torn state, completely opening the container cover.

[0030] The sealing member 5 inside the cover 1 has a narrow lower end and a convex middle part, and is in the shape of a flat sheet with a convex middle part as a whole. The lower part of the sealing member 5 is used to fit with the inside of the container mouth, and after being screwed, the container mouth is clamped between the middle protruding part and the lower end part, improving the sealing performance of the container.

[0031] The inner wall of the cover 1 has an anti-theft tooth buckle 11 at the bottom and an internal thread 10 throughout the middle part. The internal thread 10 is composed of a plurality of convex strips distributed along a spiral line, and the convex strips are not continuous, and the discontinuous parts are used to accommodate the passage of liquid and gas, avoiding the occurrence of liquid accumulation and high pressure in the bottle; the anti-theft tooth buckle 11 is composed of a plurality of discontinuous circular arc protrusions, which form protrusions corresponding to the grooves of the container mouth, and after being tightened, the sealing cover is completely fixed on the container mouth.

Claims

1. A center-pull type container sealing cover characterized in that: it comprises a cover body (1) and a pull structure provided on the cover body (1), the cover body (1) is a bottom-opened shell; a counterbore (2) is provided on the top surface of the shell, the pull structure is located inside the counterbore (2), the pull structure comprises a pull tab (3) located on the back of the counterbore (2) and a center circular plate (4) located in the middle of the pull tab (3); a reinforcing rib is further provided on the cover body (1) and connected with the pull structure to prevent the pull tab from being contaminated; a gap is formed between the counterbore (2) and the side wall of the cover body (1), and a sealing element (5) is arranged in the gap, the sealing element (5) is connected with the inner wall of the top of the cover body (1), and the cover body (1) is integrally formed.

2. The center-pull type container sealing cover according to claim 1 characterized in that: the pull tab (3) is in a fan ring structure, and the circle formed by the pull tab (3) coincides with the center of the counterbore (2); a center counterbore (6) is provided on the bottom surface of the counterbore (2), and the center counterbore (6) is located at the center of the center circular plate (4).

3. The center-pull type container sealing cover according to claim 1 characterized in that: a pull line (7) is provided between the center circular plate (4) and the pull tab (3), and the pull line (7) is a groove provided on the pull tab (3) and the center circular plate (4); the pull line (7) comprises a part distributed around the outer periphery of the center circular plate (4) and a part located between the pull tabs (3).

4. The center-pull type container sealing cover according to claim 1 characterized in that: reinforcing ribs are provided on the pull tab (3) and the center circular plate (4), and the reinforcing ribs comprise reinforcing long ribs (8) and reinforcing short ribs (9); the reinforcing short ribs (9) and the reinforcing long ribs (8) are located on the same line passing through the center of the cover body (1).

5. The center-pull type container sealing cover according to claim 4 characterized in that: one end of the reinforcing long rib (8) is connected with the cover body (1), the other end passes through the adjacent pull tab (3) and is connected with the center circular plate (4), and the middle part of the reinforcing long rib (8) is connected with the adjacent pull tab (3); one end of the reinforcing short rib (9) is connected with the cover body (1), and the other end is connected with the adjacent pull tab (3).

6. The center-pull type container sealing cover according to claim 1 characterized in that: the sealing element (5) is an annular protrusion, a gap with a width matching the thickness of the container mouth is formed between the sealing element (5) and the side wall of the cover body (1); the outer diameter of the lower end of the sealing element (5) is smaller than the inner diameter of the container mouth, and the outer diameter of the middle part of the sealing element (5) is larger than the inner diameter of the container mouth.

7. The center-pull type container sealing cover according to claim 1 characterized in that: an inner thread (10) is provided on the inner wall of the cover body (1), and the inner thread (10) matches the outer thread of the container mouth; the inner thread (10) is composed of a plurality of arc-shaped protrusions which are not connected.

8. The center-pull type container sealing cover according to claim 1 characterized in that: an anti-theft tooth buckle (11) is provided on the bottom inner wall of the cover body (1), and the anti-theft tooth buckle (11) is composed of a plurality of protrusions. The anti-theft tooth buckle (11) is uniformly distributed on the inner wall of the bottom of the cover body (1).

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