Resealing type metal bottle cap

Abstract

The invention discloses a resealing type metal bottle cap, and relates to the technical field of bottle caps, the resealing type metal bottle cap is used for being matched with a metal tank body with an opening formed in the top, the resealing type metal bottle cap comprises a conical cap connected to the opening, a filling opening is formed in the conical cap, a metal cap is connected to the filling opening in a threaded mode, and an integrated ring is further constructed on the conical cap; during filling, the integrated ring is in lap joint with a supporting structure of filling equipment to integrally limit the tank body so as to realize filling. According to the resealing type metal bottle cap provided by the invention, the tank body can be suitable for a filling system of a plastic bottle through the integrated ring on the conical cap, so that the tank body is filled through the filling opening in the conical cap, and the application from metal packaging to the field of plastic packaging is expanded; and compared with a zip-top can, the metal cover can be screwed again for sealing after being unscrewed, so that the beverage can be drunk up in multiple times, and waste is avoided as much as possible.

Description

Technical Field

[0001] The present invention relates to the technical field of bottle caps, and in particular to a resealable metal bottle cap. Background Art

[0002] In the food packaging industry, food is mostly packaged in glass bottles, plastic bottles, porcelain bottles, or metal cans. The bottle cap is an important component of the bottle or can body. Before the bottle cap is installed, the package has an opening for filling. After the bottle cap is installed, the entire package has a good sealing and preservation function.

[0003] For example, the patent document with the announcement number CN209522040U discloses a small-capacity bottle cap for a tasting series, which includes a main body, a connecting groove, a sealing cover, connecting teeth, and a built-in sealing cover. A bottle mouth is installed at one end of the main body, and the outer side of the bottle mouth is wrapped with a clamping ring. A sealing sleeve is installed on the side of the main body near the bottle mouth. The patent is connected to the sealing cover through the sealing sleeve. The anti-counterfeiting teeth are restricted by the engagement of the connecting teeth with the connecting groove of the sealing sleeve and cannot move. The bottle mouth is also inlaid with a built-in sealing cover, which can further provide protection and sealing. When the main body is rotated to open, the sealing sleeve is fixed to the bottle mouth by the clamping ring, so the external force will break the anti-counterfeiting teeth, thereby reminding the opener of the authenticity of the wine.

[0004] In the prior art, a ring structure is provided at the mouth of a plastic bottle so that the bottle body can be placed on the clamp of a filling production line. However, metal cans are not suitable for the filling production line of plastic bottles. Summary of the Invention

[0005] The object of the present invention is to provide a resealable metal bottle cap to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A resealable metal bottle cap, used to fit a metal can with an opening at the top, comprising a conical cap connected to the opening, a filling port formed on the conical cap, a metal cap screwed onto the filling port, and an integrated ring configured on the conical cap; During filling, the integrated ring is overlapped on the supporting structure of the filling equipment to limit the tank body as a whole, thereby achieving filling.

[0007] In the above-mentioned resealable metal bottle cap, a sealing gasket is provided between the filling port and the metal cap.

[0008] In the above-mentioned resealable metal bottle cap, the outer wall of the filling port is configured with a first external thread, and the inner wall of the metal cap is configured with a first internal thread that matches the first external thread.

[0009] The above-mentioned resealable metal bottle cap has a sleeve screwed onto the outer wall of the metal cap, and the sleeve is screwed onto the conical cap.

[0010] The above-mentioned resealable metal bottle cap has a second external thread on the outer wall of the metal cap, and a second internal thread adapted to the second external thread on the inner wall of the sleeve. Both ends of the second external thread are configured to seal, and the length of the second internal thread is smaller than that of the second external thread.

[0011] In the above-mentioned resealable metal bottle cap, the outer wall of the conical cap is configured with a third external thread, and the inner wall of the sleeve is configured with a third internal thread adapted to the third external thread.

[0012] In the above-mentioned resealable metal bottle cap, the outer wall of the conical cap is constructed with a raised ring, the bottom of the sleeve is fixed with a plurality of connecting bridges, the bottoms of the plurality of connecting bridges are fixed with connecting rings, and the inner wall of the connecting ring is constructed with a folding plate.

[0013] In the above-mentioned resealable metal bottle cap, when the metal cap is screwed into the filling port, the second internal thread is at the bottom end of the second external thread.

[0014] When unscrewing the above-mentioned resealable metal bottle cap, the sleeve is first twisted to move the second internal thread to the top of the second external thread. During the process, the connecting bridge is broken and the third internal thread and the third external thread are separated.

[0015] The above-mentioned resealable metal bottle cap has a limiting component constructed on the metal cap. When the first internal thread and the first external thread are screwed together, the limiting component limits the relative position of the conical cap and the metal cap. After the second internal thread moves to the top end of the second external thread, the limiting component releases the restriction on the conical cap and the metal cap.

[0016] In the above technical solution, the present invention provides a resealable metal bottle cap, which enables the can body to be suitable for the filling system of plastic bottles through the integrated ring on the conical cap, so that the can body can be filled through the filling port on the conical cap, thereby expanding the application of metal packaging to the field of plastic packaging; compared with cans, the metal cap can be screwed on again and sealed after being unscrewed, so that the beverage can be consumed in multiple times, thereby minimizing waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 2 A schematic diagram of the sealing gasket structure provided in yet another embodiment of the present invention; Figure 3 A schematic diagram of the overall structure of a conical cover provided by another embodiment of the present invention; Figure 4 A schematic diagram of a raised ring structure provided in yet another embodiment of the present invention; Figure 5 A schematic diagram of the metal cover and sleeve structure provided in yet another embodiment of the present invention; Figure 6 A schematic diagram of the annular groove structure provided in another embodiment of the present invention; Figure 7 Another embodiment of the present invention provides Figure 6 A in the middle is an enlarged structural diagram; Figure 8 A schematic diagram of the structure of an extrusion ring embedded in an annular groove provided in another embodiment of the present invention.

[0019] Description of reference numerals: 1. Tank body; 2. Conical cover; 3. Filling port; 4. Metal cover; 5. Integrated ring; 6. Sealing gasket; 7. First external thread; 8. First internal thread; 9. Sleeve; 10. Second external thread; 11. Second internal thread; 12. Third external thread; 13. Third internal thread; 14. Raised ring; 15. Connecting bridge; 16. Connecting ring; 17. Folding plate; 18. Annular groove; 19. Elastic sheet; 20. Extrusion ring. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Reference Figure 1-8 An embodiment of the present invention provides a resealable metal bottle cap, which is used to match a metal can body 1 with an opening at the top, including a conical cover 2 connected to the opening, a filling port 3 formed on the conical cover 2, a metal cover 4 screwed on the filling port 3, and an integrated ring 5 constructed on the conical cover 2; during filling, the integrated ring 5 overlaps the supporting structure of the filling equipment to limit the can body 1 as a whole to achieve filling.

[0022] Specifically, the mouth of a plastic bottle is generally conical, and a ring-shaped structure is provided on the outer wall of the mouth to accommodate the operation of the filling system. A clamping structure is provided in the filling system of the plastic bottle. During filling, the ring-shaped structure on the outer wall of the plastic bottle is overlapped between two clamping structures, and then the clamping structure can be used to drive the plastic bottle to move and fill. For a metal can body 1, it is generally configured as an easy-open can structure. After the can body 1 is filled with the corresponding filling system, an easy-open lid structure is connected to the opening of the can body 1. Obviously, two sets of filling systems are required for the metal can body 1 and the plastic bottle respectively when filling. The above are all existing technologies and will not be elaborated here. The innovation of the embodiment of the present invention is that a metal conical cover 2 is connected to the opening of the metal can body 1. The connection method of the conical cover 2 and the can body 1 can be a roll-sealing connection method in the prior art (similar to the connection method of the can body 1 and the easy-open lid) or a sealant connection, or the sealant can be pre-coated at the same time as the roll-sealing connection; the bottom end of the conical cover 2 is a cover body, which is connected to the opening of the can body 1 through the cover body roll-sealing, and the cover body is constructed with a conical structure, and the top of the conical structure is columnar. The interior of the conical cover 2 is hollow as a whole, and an opening is constructed on the cover body at the bottom and is connected to the opening at the top of the can body 1. The top columnar structure is also constructed with an opening to form a filling port 3, and the top of the conical cover 2 is connected to the can body 1. The filling port 3 at the top is constructed as a bottle mouth structure; when the can body 1 is filled, the metal cover 4 is screwed to the top end of the conical cover 2 to seal the filling port 3, thereby sealing and preserving the beverage in the can body 1. That is, in each embodiment of the present invention, the opening of the can body 1 is first sealed by the conical cover 2, and then the opening of the conical cover 2 is sealed by the metal cover 4 to form a resealable metal bottle cap; the integrated ring 5 is constructed on the outer wall of the columnar structure of the conical cover 2. After the conical cover 2 and the can body 1 are connected, the can body 1 can be overlapped on the filling system of the plastic bottle through the integrated ring 5, so as to drive the conical cover 2 and the can body 1 to move through the clamping structure and fill through the filling port 3. The advantage of such an arrangement is that, by providing the conical cover 2 and the metal cover 4, the application of metal packaging to the field of plastic packaging is expanded, so that metal cans can use the same transmission and filling system as plastic bottles (PET bottles), replacing plastic bottles on existing canning lines, reducing the use of plastic products in the packaging industry, and also reducing the pollution to the natural environment caused by the production process and waste plastic products; the metal can body 1, conical cover 2 and metal cover 4 can be recycled, and the weight is smaller than that of a glass bottle of the same volume, which is more environmentally friendly than a plastic bottle and convenient for recycling; the combination of the conical cover 2 and the metal cover 4 is similar to the bottle mouth part of a plastic bottle, which is convenient for drinking; compared with a can, the metal cover 4 can be screwed on again and sealed after being unscrewed, so that the beverage can be consumed in multiple times to minimize waste.

[0023] A resealable metal bottle cap provided in an embodiment of the present invention enables the can body 1 to be adapted to the filling system of plastic bottles through the integrated ring 5 on the conical cap 2, so that the can body 1 can be filled through the filling port 3 on the conical cap 2, thereby expanding the application of metal packaging to the field of plastic packaging; compared with cans, the metal cap 4 can be screwed on again for sealing after being unscrewed, so that the beverage can be consumed in multiple times, thereby minimizing waste.

[0024] In another embodiment provided by the present invention, a sealing gasket 6 is further provided between the filling port 3 and the metal cover 4. Specifically, the sealing gasket 6 can be a rubber gasket in the prior art, which is embedded in the inner wall of the metal cover 4. When the metal cover 4 is screwed to the filling port 3, the end of the filling port 3 contacts the sealing gasket 6, thereby improving the sealing between the filling port 3 and the metal cover 4.

[0025] In another embodiment provided by the present invention, further, the outer wall of the filling port 3 is configured with a first external thread 7, and the inner wall of the metal cover 4 is configured with a first internal thread 8 adapted to the first external thread 7. Specifically, the first external thread 7 is configured on the outer wall of the conical cover 2 away from the can body 1, the first internal thread 8 is configured on the inner side of the metal cover 4, and the sealing gasket 6 is located on the inner side of the first internal thread 8, so that when the first internal thread 8 and the first external thread 7 are screwed together, the filling port 3 can contact the sealing gasket 6 on the inner wall of the metal cover 4, thereby improving the connectivity and sealing between the metal cover 4 and the filling port 3 through the threaded structure and the sealing gasket 6.

[0026] Furthermore, a sleeve 9 is screwed onto the outer wall of the metal cover 4, and the sleeve 9 is screwed onto the conical cover 2. Specifically, the sleeve 9 is screwed onto the outer wall of the metal cover 4 so that the two can approach or move away from each other through the threaded structure. After the metal cover 4 is screwed onto the filling port 3, the sleeve 9 is rotated so that the sleeve 9 is screwed onto the outer wall of the conical cover 2 while moving away from the metal cover 4 (when the sleeve 9 is rotated to move away from the metal cover 4, the rotation direction of the sleeve 9 is the same as the tightening direction of the metal cover 4, that is, when the metal cover 4 and the sleeve 9 rotate in the same direction, the metal cover 4 can be screwed onto the filling port 3, and the sleeve 9 can be relatively away from the metal cover 4 and screwed onto the conical cover 2); the screw connection structure between the metal cover 4 and the sleeve 9 can make the two approach or move away from each other, and there is an extreme position between the metal cover 4 and the sleeve 9 when they approach or move away from each other, that is, the metal cover 4 and the sleeve 9 cannot be separated. The purpose of such a setting is that by tightening the metal cover 4 and the sleeve 9 in turn, the metal cover 4 and the sleeve 9 can be screwed onto the outer wall of the filling port 3 in turn, wherein the metal cover 4 can be screwed onto the outer wall of the filling port 3 to seal the filling port 3, and the sleeve 9 can be moved to the extreme position away from the metal cover 4 after being screwed onto the outer wall of the conical cover 2. At this time, continuing to screw the sleeve 9 can make the sleeve 9 continue to move away from the metal cover 4 while rotating, thereby applying a downward force to the metal cover 4, further improving the connectivity and sealing between the metal cover 4 and the filling port 3; conversely, when it is necessary to unscrew the metal cover 4, it is necessary to first screw the sleeve 9 to separate it from the conical cover 2, and then the metal cover 4 can be screwed and unscrewed from the filling port 3.

[0027] Preferably, the outer wall of the metal cover 4 is configured with a second external thread 10, and the inner wall of the sleeve 9 is configured with a second internal thread 11 adapted to the second external thread 10. Both ends of the second external thread 10 are configured to be sealed, and the length of the second internal thread 11 is shorter than the second external thread 10. The outer wall of the conical cover 2 is configured with a third external thread 12, and the inner wall of the sleeve 9 is configured with a third internal thread 13 adapted to the third external thread 12. Specifically, the inner wall of the sleeve 9 is constructed with a second internal thread 11 and a third internal thread 13, the second internal thread 11 is located at the top of the third internal thread 13, and the overall inner diameter of the second internal thread 11 is larger than the overall inner diameter of the third internal thread 13; the third external thread 12 has the same structure and the same overall outer diameter as the first external thread 7, so that the third internal thread 13 can be screwed onto the first external thread 7 first and then screwed onto the third external thread 12; since both ends of the second external thread 10 are constructed to be sealed and the length of the second internal thread 11 is smaller than the second internal thread 11, the second internal thread 11 has a certain rotation stroke in the second external thread 10, and the second internal thread 11 will not detach from the second external thread 10; when the second internal thread 11 moves to the top end of the second external thread 10, the sleeve 9 and the metal cover 4 approach each other to the extreme position; when the second internal thread 11 moves to the bottom end of the second external thread 10, the sleeve 9 and the metal cover 4 move away from each other to the extreme position. The advantage of such a setting is that by providing the second internal thread 11, the sleeve 9 can be screwed onto the second external thread 10 on the outer wall of the metal cover 4, and the second external thread 10 can limit the position of the second internal thread 11, so that the metal cover 4 and the sleeve 9 can approach or move away from each other without separating; when the metal cover 4 and the sleeve 9 are both screwed to the outer wall of the conical cover 2, tightening the sleeve 9 can squeeze the end of the second external thread 10 through the second internal thread 11, thereby forcing the sleeve 9 and the metal cover 4 to rotate further to strengthen the connectivity and sealing between the metal cover 4 and the filling port 3.

[0028] In the prior art, an anti-theft ring structure is provided on the bottle cap to determine whether the bottle cap has been opened, thereby determining whether the beverage is safe. For mineral water bottle caps, the anti-theft ring structure is generally made of a flexible material, and the anti-theft ring can only be broken after the bottle cap is rotated nearly half a circle. Obviously, when the bottle cap is rotated and the anti-theft ring is not broken, the sealing performance of the bottle cap will be reduced. For liquor bottle caps, which have higher requirements for sealing performance, the anti-theft ring structure is generally set as a rigid structure. The anti-theft ring will break after the bottle cap is slightly rotated, and the situation where the sealing performance of the liquor bottle cap is reduced while the anti-theft ring is not broken is avoided as much as possible, thereby improving the safety of liquor beverages. However, the disadvantage of this method is that some residue will fall after the anti-theft ring breaks.

[0029] Furthermore, a raised ring 14 is constructed on the outer wall of the conical cover 2 , a plurality of connecting bridges 15 are fixed to the bottom of the sleeve 9 , a connecting ring 16 is fixed to the bottom of the plurality of connecting bridges 15 , and a folding plate 17 is constructed on the inner wall of the connecting ring 16 . Specifically, the raised ring 14 is located between the integrated ring 5 and the third external thread 12, and the bottom wall of the raised ring 14 is constructed as a plane; the bottom end of the sleeve 9 and the connecting ring 16 are fixed by a number of connecting bridges 15, and the connecting bridges 15 are made of a flexible material with a smaller diameter in the existing technology, which will break when pulled (similar to the anti-theft ring of a mineral water bottle); the inner wall of the connecting ring 16 is provided with a plurality of folding plates 17, and the folding plates 17 are arc-shaped, and their bottom ends are fixed to the bottom end of the connecting ring 16. The folding plates 17 have a certain elasticity, so that the free end of the folding plate 17 (the end of the folding plate 17 that is not fixed to the connecting ring 16, that is, the top end of the folding plate 17) can move away from the connecting ring 16 under the action of its own elasticity, so that there is a certain angle between the folding plate 17 and the connecting ring 16. When the folding plate 17 is squeezed, its free end can fit into the inner wall of the connecting ring 16. When the folding plate 17 loses external force squeezing, the top end of the folding plate 17 can move away from the inner wall of the connecting ring 16 again under the action of its own elasticity. With such arrangement, the connecting ring 16 and the sleeve 9 can be moved synchronously through a number of connecting bridges 15. In the process of the sleeve 9 being screwed to the outer wall of the conical cover 2, the connecting ring 16 moves synchronously with the sleeve 9 to drive the folding plate 17 to approach the raised ring 14. When the folding plate 17 and the raised ring 14 conflict with each other, the folding plate 17 is contacted by the raised ring 14 and fits onto the inner wall of the connecting ring 16, so that the folding plate 17 avoids the raised ring 14 until the sleeve 9 and the metal cover 4 are tightened on the conical cover 2, and the folding plate 17 moves to the bottom of the raised ring 14. At this time, the top of the folding plate 17 can move away from the connecting ring 16 and move to the bottom of the raised ring 14 under its own elasticity, so that the position of the connecting ring 16 can be limited by the folding plate 17. The advantage is that after the can body 1 and the conical cover 2 are filled through the filling port 3, the metal cover 4 and the sleeve 9 are tightened onto the conical cover 2 to seal the filling port 3. During the process, the folding plate 17 moves to the bottom of the raised ring 14. When the metal cover needs to be opened, the sleeve 9 needs to be twisted first to release its restriction on the metal cover 4. When the sleeve 9 is twisted, the connecting ring 16 and the folding plate 17 are restricted by the raised ring 14 and cannot move close to the metal cover 4 with the sleeve 9, so that several connecting bridges 15 will be pulled and broken, so that the connecting ring 16 remains in the position of the raised ring 14. In this way, whether the metal cover 4 is opened can be judged by whether the connecting bridge 15 is broken, and when several connecting bridges 15 are broken, the metal cover 4 has not yet loosened. In this way, it can avoid the generation of residue and timely observe whether the metal cover 4 is loose, thereby trying to avoid the reduction of the sealing between the metal cover 4 and the filling port 3.

[0030] In another embodiment provided by the present invention, further, when the metal cover 4 is screwed into the filling port 3, the second internal thread 11 is at the bottom end of the second external thread 10. When unscrewing the metal cover 4, first screw the sleeve 9 to move the second internal thread 11 to the top end of the second external thread 10. During the process, the connecting bridge 15 breaks, and the third internal thread 13 and the third external thread 12 are separated. Specifically, in order to enable the metal cover 4 and the sleeve 9 to be tightened onto the conical cover 2, when the metal cover 4 and the sleeve 9 are screwed into the conical cover 2, the second internal thread 11 is at the bottom end of the second external thread 10. At this time, the sleeve 9 cannot continue to move away from the metal cover 4, and the two form a whole. At this time, the sleeve 9 can be directly controlled to screw the third internal thread 13 onto the first external thread 7 and the third external thread 12 in turn, and in the process of the third internal thread 13 being screwed onto the third external thread 12, the first internal thread 8 on the inner wall of the metal cover 4 will be synchronously screwed onto the first external thread 7. In this way, it is only necessary to control The sleeve 9 can tighten the metal cover 4 and the sleeve 9 onto the conical cover 2 to seal the filling port 3; when the metal cover 4 needs to be opened, the sleeve 9 is first twisted in the opposite direction so that the second internal thread 11 moves to the top of the second external thread 10. During the process, the second internal thread 11 and the third external thread 12 separate, and the sleeve 9 stretches the connecting bridges 15 so that the connecting bridges 15 break. After the second internal thread 11 moves to the top of the second external thread 10, the sleeve 9 is continued to be twisted in the opposite direction to drive the metal cover 4 to rotate in the opposite direction, thereby unscrewing the metal cover 4 from the conical cover 2. The advantage of such a setting is that by twisting the sleeve 9 in the forward direction, the metal cover 4 and the sleeve 9 can be synchronously screwed onto the conical cover 2, and by twisting the sleeve 9 in the reverse direction, the sleeve 9 and the metal cover 4 can be successively unscrewed from the conical cover 2, thereby simplifying the steps of using the bottle cap as much as possible.

[0031] Furthermore, the metal cover 4 is constructed with a limiting assembly. When the first internal thread 8 and the first external thread 7 are screwed together, the limiting assembly limits the relative position of the conical cover 2 and the metal cover 4. After the second internal thread 11 moves to the top of the second external thread 10, the limiting assembly releases the restriction on the conical cover 2 and the metal cover 4. Specifically, in the above embodiment, when the sleeve 9 is rotated in the opposite direction, a certain friction force is generated between the second internal thread 11 and the second external thread 10. Before the second internal thread 11 moves to the top of the second external thread 10, the metal cover 4 may rotate in the opposite direction with the sleeve 9, which may cause the metal cover 4 to loosen prematurely, or even cause the metal cover 4 to loosen before the connecting bridge 15 is broken. To avoid this possible situation, the limiting assembly is provided in this embodiment. The limiting assembly can be a conventional press-limiting structure, such as a press block slidably connected to the metal cover 4 and capable of contacting the inner wall of the conical cover 2. When the sleeve 9 is rotated in the opposite direction, the press block is squeezed to increase the friction between the metal cover 4 and the conical cover 2, thereby minimizing the possibility of premature loosening of the metal cover 4.

[0032] As an alternative to the above-mentioned press-limiting structure, preferably, the limiting component includes an annular groove 18 constructed on the inner wall of the metal cover 4, and the annular groove 18 is located on the side of the first internal thread 8 away from the sealing gasket 6. An elastic sheet 19 is arranged in the annular groove 18, and the bottom end of the elastic sheet 19 is fixed on the inner wall of the annular groove 18, and the top end (free end) has a tendency to move away from the annular groove 18 under its own elastic force. An extrusion ring 20 is constructed on the sleeve 9, and the extrusion ring 20 is adapted to the annular groove 18. When the second internal thread 11 moves to the top end of the second external thread 10, the extrusion ring 20 is embedded in the annular groove 18 and forces the top end of the elastic sheet 19 to be retracted into the annular groove 18. Specifically, the inner diameter of the extrusion ring 20 is slightly larger than the outer diameter of the first external thread 7, that is, when the metal cover 4 and the sleeve 9 are in operation, the extrusion ring 20 will not interfere with the first external thread 7; the length of the first external thread 7 is greater than the length of the first internal thread 8, and the bottom end of the first external thread 7 is constructed as a plane; when the metal cover 4 is screwed to the top of the conical cover 2, the bottom end of the first external thread 7 is exposed from the bottom end of the first internal thread 8, and at this time, the part of the first external thread 7 exposed from the first internal thread 8 corresponds to the annular groove 18, so that the elastic sheet 19 can move away from the annular groove 18 and Move to the bottom end of the first external thread 7, so that the elastic piece 19 abuts against the plane of the bottom end of the first external thread 7; since the first external thread 7 is in a threaded shape, the height of the first external thread 7 corresponding to different positions of the annular groove 18 is different. For this reason, multiple elastic pieces 19 are arranged in the annular groove 18. The multiple elastic pieces 19 are spirally arranged to adapt to the trend of the bottom end of the first external thread 7, so that after the metal cover 4 is tightened on the conical cover 2, the multiple elastic pieces 19 can move away from the annular groove 18 under their own elasticity and abut against the planes at different positions of the bottom end of the first external thread 7 (such as Figure 6 and Figure 7 As shown, the two relative elastic sheets 19 respectively contact different positions of the bottom end of the first external thread 7); in the process of tightening the metal cover 4, the elastic sheet 19 has a tendency to move away from the annular groove 18 and contact the first external thread 7. As the metal cover 4 is tightened, the elastic sheet 19 will sequentially pass over the outer wall of different positions of the first external thread 7 until the metal cover 4 is in a tightened state and the elastic sheet 19 contacts the plane of the bottom end of the first external thread 7; when it is necessary to open the metal cover 4, the metal cover 4 is restricted by the elastic sheet 19 and cannot be directly unscrewed from the conical cover 2 in the reverse direction. It is necessary to first reversely screw the sleeve 9 to break the connecting bridge 15. As the sleeve 9 and the metal cover 4 approach each other, the extrusion ring 20 is gradually embedded in the annular groove 18, so that the free ends of the multiple elastic sheets 19 are forced to be sequentially received in the annular groove 18 by the extrusion of the extrusion ring 20, until the second internal thread 11 moves to the top end of the second external thread 10, and the multiple elastic sheets 19 are all received in the annular groove 18 (as shown in FIG. Figure 8 As shown), continuing to rotate the sleeve 9 in the opposite direction can drive the metal cover 4 to rotate in the opposite direction synchronously, thereby unscrewing the metal cover 4 from the conical cover 2.

[0033] The advantage of such an arrangement is that after the can body 1 and the conical cover 2 are filled, the metal cover 4 and the sleeve 9 are screwed onto the conical cover 2. During the process, the elastic sheet 19 can be passively clamped to the bottom end of the first external thread 7, thereby limiting the relative positions of the conical cover 2 and the metal cover 4. At the same time, the folding plate 17 can also be clamped to the bottom end of the raised ring 14 to limit the position of the connecting ring 16; when it is necessary to open the metal cover 4, the sleeve 9 is first rotated in the opposite direction to break the connecting bridge 15, and when the connecting bridge 15 is broken, the metal cover 4 has not yet loosened, thus promptly warning the user that the bottle cap has been used; when the sleeve 9 is rotated in the opposite direction, the extrusion ring 20 is gradually embedded in the annular groove 18, thereby releasing the restrictions on the position of the metal cover 4 by multiple elastic sheets 19, so that the metal cover 4 can be rotated in the opposite direction synchronously with the sleeve 9, thereby unscrewing the metal cover 4. During the use of the entire bottle cap, the operation is relatively simple and can adapt to the needs of the user. At the same time, the setting of the limiting component and the connecting bridge 15 can promptly warn the user that the bottle cap has been used, and try to avoid the situation where the metal cap 4 is loose but the connecting bridge 15 is not broken, and at the same time avoid the generation of residue when the bottle cap is opened.

[0034] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A resealable metal bottle cap, which is used to fit a metal can body with an opening at the top, characterized in that: It comprises a conical cover connected to the opening, a filling port is formed on the conical cover, a metal cover is screwed on the filling port, and an integrated ring is also constructed on the conical cover; During filling, the integrated ring is overlapped on the supporting structure of the filling equipment to limit the tank body as a whole, thereby achieving filling.

2. A resealable metal bottle cap according to claim 1, characterized in that: A sealing gasket is arranged between the filling port and the metal cover.

3. The resealable metal bottle cap according to claim 1, characterized in that: The outer wall of the filling port is configured with a first external thread, and the inner wall of the metal cover is configured with a first internal thread matched with the first external thread.

4. The resealable metal bottle cap according to claim 3, characterized in that: A sleeve is screwed on the outer wall of the metal cover, and the sleeve is screwed on the conical cover.

5. The resealable metal bottle cap according to claim 4, characterized in that: The outer wall of the metal cover is configured with a second external thread, the inner wall of the sleeve is configured with a second internal thread adapted to the second external thread, both ends of the second external thread are configured to be sealed, and the length of the second internal thread is smaller than that of the second external thread.

6. The resealable metal bottle cap according to claim 4, characterized in that: The outer wall of the conical cover is configured with a third external thread, and the inner wall of the sleeve is configured with a third internal thread matched with the third external thread.

7. The resealable metal bottle cap according to claim 5, characterized in that: The outer wall of the conical cover is configured with a raised ring, a plurality of connecting bridges are fixed to the bottom of the sleeve, a plurality of connecting rings are fixed to the bottom of the connecting bridges, and a folding plate is configured on the inner wall of the connecting ring.

8. The resealable metal bottle cap according to claim 7, characterized in that: When the metal cover is screwed into the filling port, the second internal thread is at the bottom end of the second external thread.

9. The resealable metal bottle cap according to claim 8, characterized in that: When unscrewing the metal cover, the sleeve is firstly twisted to move the second internal thread to the top of the second external thread. During the process, the connecting bridge is broken and the third internal thread is separated from the third external thread.

10. The resealable metal bottle cap according to claim 5, characterized in that: The metal cover is provided with a limiting assembly, which limits the relative positions of the conical cover and the metal cover when the first internal thread and the first external thread are screwed together, and releases the limitation on the conical cover and the metal cover after the second internal thread moves to the top of the second external thread.

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