Anti-pull-up bottle cap structure and wine bottle

Abstract

The utility model relates to the technical field of white spirit anti-counterfeiting, and discloses an anti-pull-up bottle cap structure and a wine bottle, the anti-pull-up bottle cap structure comprises a cap body; the inner upper sleeve is suitable for being connected with the cover body; the inner upper sleeve is made of a PET (Polyethylene Terephthalate) material; the inner lower sleeve is suitable for being connected with the inner upper sleeve, and the inner lower sleeve is suitable for being connected with a wine bottle opening in an abutting mode; the inner upper sleeve and the inner lower sleeve are integrally formed by adopting a double-shot molding process; the inner lower sleeve is made of engineering plastics. In the scheme, the inner lower sleeve is made of engineering plastics, and the engineering plastics are high in hardness, not easy to soften at high temperature, and can obviously deform and cannot recover after being softened, so that the problem that the bottle cap is undamaged to be pulled out after the bottle cap is heated and deformed is solved. And the inner lower sleeve is made of engineering plastics, the hardness of the inner lower sleeve is higher, and the inner lower sleeve is propped against the wine bottle opening, so that if the inner lower sleeve is forcibly pulled up by external force, the wine bottle opening is easily damaged, and the anti-counterfeiting effect is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of liquor anti-counterfeiting, and in particular to an anti-pull-up bottle cap structure and a liquor bottle. Background Art

[0002] Liquor counterfeiting is an illegal activity that harms not only the health and safety of consumers but also the broader socioeconomic order. Counterfeit liquor is often bottled in low-quality bottles, often made from simple fermentation of low-cost raw materials (such as tubers) and containing high levels of methanol and other harmful substances.

[0003] In the prior art, the bottle caps are usually heated, and after the bottle caps are deformed by heat, they can be pulled out without damage, thereby counterfeiting liquor.

[0004] Now there is a need for an anti-pull-off bottle cap structure to prevent the bottle cap from being deformed by heat and to achieve lossless removal of the bottle cap, thereby preventing the counterfeiting of liquor. Utility Model Content

[0005] In view of this, the utility model provides an anti-pulling bottle cap structure and a wine bottle, so as to solve the problem of achieving non-destructive pulling out of the bottle cap after the bottle cap is deformed by heat.

[0006] In a first aspect, the present invention provides an anti-lift-off bottle cap structure, comprising:

[0007] Cover body;

[0008] The inner upper sleeve is suitable for connecting with the cover body; the material of the inner upper sleeve is PET;

[0009] The inner lower sleeve is suitable for connecting with the inner upper sleeve, and the inner lower sleeve is suitable for abutting against the mouth of the wine bottle; the inner upper sleeve and the inner lower sleeve are integrally formed by a two-color injection molding process; the material of the inner lower sleeve is engineering plastic.

[0010] In this solution, the inner lower sleeve is made of engineering plastic. Engineering plastic has high hardness and is not easily softened at high temperatures. Once softened, it can deform significantly and cannot be restored. This solves the problem of non-destructive removal of bottle caps after thermal deformation. Furthermore, since the inner lower sleeve is made of engineering plastic, its hardness is also high. Furthermore, since the inner lower sleeve abuts against the bottle mouth, forcible removal by external force can easily damage the bottle mouth, thus ensuring anti-counterfeiting effectiveness.

[0011] In an optional embodiment, the method further includes:

[0012] At least one abutment structure is provided on the inner side of the inner lower sleeve; one end of the abutment structure is fixedly connected to the inner lower sleeve, and the other end is adapted to abut against the mouth of the wine bottle; the thickness of the abutment structure is 1.5mm-1.7mm. The addition of the abutment structure ensures the abutment effect between the inner lower sleeve and the mouth of the wine bottle, and the increased thickness of the abutment structure further enhances the anti-lifting effect.

[0013] In an optional embodiment, a first engaging portion is provided at the bottom of the inner upper sleeve, and a second engaging portion is provided at the top of the inner lower sleeve, wherein the second engaging portion is adapted to engage with the first engaging portion. In this embodiment, although the inner upper sleeve and the inner lower sleeve are integrally formed via a two-color injection molding process, the inner upper sleeve and the inner lower sleeve still have the risk of separation under certain external forces. Further adding the first engaging portion and the second engaging portion increases the stability of the connection between the inner upper sleeve and the inner lower sleeve, greatly reducing the risk of separation between the inner upper sleeve and the inner lower sleeve.

[0014] In an optional embodiment, the method further includes:

[0015] The plurality of stop teeth are fixedly mounted on the inner side of the inner lower sleeve on one side and adapted to abut against the mouth of the wine bottle on the other side, preventing the inner lower sleeve from rotating. The provision of the stop teeth in this solution prevents the inner lower sleeve from rotating freely, thereby ensuring the stability of the overall structure.

[0016] In an optional embodiment, the method further includes:

[0017] The inner plug is partially inserted into the bottle opening, forming a flow channel within the inner plug that communicates with the interior of the bottle. The top of the inner plug is adapted to abut the inner side of the inner upper sleeve, and the inner plug is made of LDPE. In this solution, the addition of the inner plug prevents liquid from contacting the inner lower sleeve, ensuring that the liquid remains in contact with materials that meet food safety requirements throughout the entire process, thus ensuring food safety.

[0018] In an optional embodiment, the cover body and the inner upper sleeve are connected via threads, which has the advantage of convenient opening and closing.

[0019] In an optional embodiment, the method further includes:

[0020] The anti-counterfeiting cover is mounted on the outer sides of the cover, the inner upper cover and the inner lower cover; the anti-counterfeiting cover will be damaged when the cover is opened. In this solution, the anti-counterfeiting effect is further enhanced by adding the anti-counterfeiting cover.

[0021] In a second aspect, the present invention further provides a wine bottle, comprising: the anti-pulling bottle cap structure described in any one of the above items; and further comprising: a bottle body having an internal storage space; a wine bottle opening provided on the top of the bottle body; and the wine bottle opening being suitable for the outflow of liquid from the bottle body. In this solution, since the material of the inner lower sleeve is selected from engineering plastic, engineering plastic has high hardness, is not easily softened at high temperatures, and can be significantly deformed and cannot be restored after softening, the problem of non-destructive removal of the bottle cap after the bottle cap is deformed by heat is solved. Furthermore, since the inner lower sleeve is made of engineering plastic, its hardness is also relatively high, and the inner lower sleeve abuts against the wine bottle opening. If it is forcibly pulled out by external force, the wine bottle opening is easily damaged, thereby ensuring the anti-counterfeiting effect.

[0022] In an optional embodiment, a boss is provided at the end of the bottle mouth, and one side of the boss is suitable for abutting against the abutting structure.

[0023] In an optional embodiment, the outer surface of the wine bottle is further provided with a plurality of abutment teeth adapted to abut against the anti-rotation teeth. Accommodation grooves are formed between adjacent abutment teeth, adapted to accommodate the anti-rotation teeth. Adjacent accommodating grooves have different widths. By varying the widths of adjacent accommodating grooves, the risk of tooth overlap can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of the overall structure of an anti-lift-off bottle cap structure according to an embodiment of the present utility model;

[0026] Figure 2 A schematic diagram of an inner upper sleeve and an inner lower sleeve of an anti-lift-off bottle cap structure according to an embodiment of the present invention;

[0027] Figure 3 This is an exploded view of an inner upper sleeve and an inner lower sleeve of an anti-lift-off bottle cap structure according to an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the abutment structure of an anti-lifting bottle cap structure according to an embodiment of the present utility model;

[0029] Figure 5 This is a schematic diagram of a cover body of an anti-lift-off bottle cap structure according to an embodiment of the present utility model;

[0030] Figure 6This is a schematic diagram of an inner plug of an anti-lift-off bottle cap structure according to an embodiment of the present utility model;

[0031] Figure 7 The figure is a schematic structural diagram of a wine bottle according to an embodiment of the present utility model.

[0032] Description of reference numerals:

[0033] 1. Cover body; 2. Inner upper sleeve; 21. First clamping part; 3. Inner lower sleeve; 31. Second clamping part; 4. Abutment structure; 5. Stopper; 6. Inner plug; 7. Anti-counterfeiting outer sleeve; 8. Bottle body; 81. Boss; 82. Abutment tooth; 83. Accommodation groove. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0035] like Figure 1 As shown, according to an embodiment of the present utility model, on the one hand, an anti-pulling bottle cap structure is provided, including: a cap body 1; an inner upper sleeve 2, suitable for connecting with the cap body 1; the material of the inner upper sleeve 2 is PET material; an inner lower sleeve 3, suitable for connecting with the inner upper sleeve 2, and the inner lower sleeve 3 is suitable for abutting against the mouth of the wine bottle; the inner upper sleeve 2 and the inner lower sleeve 3 are integrally formed by a two-color injection molding process; the material of the inner lower sleeve 3 is engineering plastic.

[0036] In this embodiment, the inner lower sleeve 3 is made of engineering plastic. Engineering plastic has high hardness and is not easily softened at high temperatures. Once softened, it can deform significantly and cannot be restored. This solves the problem of non-destructive removal of the bottle cap after thermal deformation. Furthermore, since the inner lower sleeve 3 is made of engineering plastic, its hardness is also high. Furthermore, since the inner lower sleeve 3 abuts the bottle mouth, forcible removal by external force can easily damage the bottle mouth, thus ensuring the anti-counterfeiting effect.

[0037] It should be noted that in this embodiment, PET is the abbreviation of polyethylene terephthalate. In this embodiment, the engineering plastic with higher hardness can be PC, PCTG and other materials.

[0038] like Figure 2As shown, it should be noted that the inner upper sleeve 2 and the inner lower sleeve 3 adopt a two-color injection molding process, which can also reduce the links of the later assembly, thereby simplifying the installation steps, and the two-color injection molding process can also eliminate the friction problem between the inner upper sleeve 2 and the inner lower sleeve 3, effectively improving the cleanliness of the bottle cap. In the related art, the inner upper sleeve 2 and the inner lower sleeve 3 are separately arranged during use or installation. The friction between the inner upper sleeve 2 and the inner lower sleeve 3 is likely to produce fine powder, thereby contaminating the bottle cap.

[0039] It should be noted that in this solution, the outer dimensions of the inner upper cover 2 and the inner lower cover 3 are basically the same as those of the original product. Since this solution basically does not make any adjustments to the appearance of the inner upper cover 2, the inner lower cover 3 and the cover body 1, it has a certain continuity in the brand appearance promotion.

[0040] like Figure 5 As shown, it should be noted that in order to optimize the process of opening the cover, anti-slip grooves are provided on the outer surface of the cover body 1. Specifically, threads are provided on the inner surface of the cover body 1, and corresponding threads are also provided on the outer surface of the inner upper sleeve 2, so that the inner upper sleeve 2 and the cover body 1 are connected by threads. The threaded connection has the advantage of convenient opening and closing.

[0041] like Figure 4 As shown, further, it also includes an abutment structure 4, which has at least one abutment structure 4. The abutment structure 4 is arranged on the inner side of the inner lower sleeve 3; one end of the abutment structure 4 is fixedly connected to the inner lower sleeve 3, and the other end is suitable for abutting against the mouth of the wine bottle; the thickness of the abutment structure 4 is 1.5mm-1.7mm. By adding the abutment structure 4, the abutment effect between the inner lower sleeve 3 and the mouth of the wine bottle is guaranteed, and by increasing the thickness of the abutment structure 4, the anti-pull-out effect is further increased. It should be noted that the abutment structure 4 is designed to be inclined toward the inner side of the inner lower sleeve 3, and the inclined design can facilitate the installation between the abutment structure 4 and the mouth of the wine bottle. During the installation process, the abutment structure 4 and the mouth of the wine bottle are slidably connected through the inclined inclined surface, so that the mouth of the wine bottle abuts against the other end of the abutment structure 4.

[0042] It should be noted that the abutting structure 4 in this solution is specifically 1.6 mm. This solution increases the thickness of the abutting structure 4 from the original 0.8 mm to 1.6 mm, thereby increasing the hardness of the abutting structure 4 and ensuring the abutting effect.

[0043] It should be noted that, in order to observe the abutment effect of the abutment structure 4 on the bottle mouth, an observation window is provided at the corresponding position of the abutment structure 4. Through the observation window, the abutment of the abutment structure 4 with the bottle mouth can be clearly observed. Furthermore, the provision of the observation window can save consumables for the inner lower sleeve 3, thus saving costs. In this embodiment, the abutment structure 4 is specifically integrally formed with the inner lower sleeve 3. This integral molding has the advantage of simplifying the manufacturing process. As an alternative embodiment, the abutment structure 4 and the inner lower sleeve 3 can also be bonded or welded.

[0044] like Figure 3 As shown, further, a first clamping portion 21 is provided at the bottom of the inner upper sleeve 2, and a second clamping portion 31 is provided at the top of the inner lower sleeve 3. The second clamping portion 31 is adapted to be clamped and connected with the first clamping portion 21. In this solution, although the inner upper sleeve 2 and the inner lower sleeve 3 are integrally formed by a two-color injection molding process, there is still a risk of separation between the inner upper sleeve 2 and the inner lower sleeve 3 under certain external forces. Further adding the first clamping portion 21 and the second clamping portion 31 increases the stability of the connection between the inner upper sleeve 2 and the inner lower sleeve 3, greatly reducing the risk of separation between the inner upper sleeve 2 and the inner lower sleeve 3.

[0045] It should be noted that, since the two-color injection molding process injects two materials of different materials into the same mold together, due to the difference in their materials, when subjected to a large external force, the inner upper sleeve 2 and the inner lower sleeve 3 are easily broken at the interface, so the first clamping portion 21 and the second clamping portion 31 are added to increase the stability of the connection. Specifically in this solution, the first clamping portion 21 extends toward the inner lower sleeve 3, and a protrusion is provided on the first clamping portion 21, and the second clamping portion 31 extends toward the inner upper sleeve 2, and a groove is provided on the second clamping portion 31. The clamping effect is achieved by the matching connection of the protrusion and the groove. In this solution, the specific first clamping portion 21 and the second clamping portion 31 are both four and evenly distributed. As an alternative embodiment, the first clamping portion 21 can also be a groove, and the second clamping portion 31 can also be a protrusion.

[0046] It should be noted that, in order to further increase the stability of the connection between the inner upper sleeve 2 and the inner lower sleeve 3, a connecting piece may be provided to stably connect the inner upper sleeve 2 and the inner lower sleeve 3 through the connecting piece.

[0047] like Figure 4 As shown, the invention further includes a plurality of stop teeth 5, one side of which is fixedly mounted on the inner side of the inner lower sleeve 3; the other side of which is adapted to abut against the mouth of the wine bottle, and the stop teeth 5 are adapted to prevent the inner lower sleeve 3 from rotating. In this embodiment, the provision of the stop teeth 5 prevents the inner lower sleeve 3 from rotating freely, thereby ensuring the stability of the overall structure.

[0048] It should be noted that if the anti-rotation teeth 5 are not provided, when the consumer rotates the cover body 1, the inner lower sleeve 3 is slidably connected with the mouth of the wine bottle, causing the inner lower sleeve 3 and the cover body 1 to rotate synchronously, thereby making it impossible to open the cover body 1.

[0049] like Figure 6 As shown, the bottle further includes an inner stopper 6, which is partially adapted to be inserted into the mouth of the wine bottle. A flow channel is formed within the inner stopper 6, communicating with the interior of the bottle. The top of the inner stopper 6 is adapted to abut the inner side of the inner upper sleeve 2. The inner stopper 6 is made of LDPE. Low-density polyethylene (LDPE), also known as high-pressure polyethylene (LDPE), is the lightest type of polyethylene resin. It appears as waxy particles that are milky white, tasteless, odorless, non-toxic, and matte. It has excellent flexibility, extensibility, electrical insulation, transparency, ease of processing, and moderate air permeability. It also exhibits good chemical stability and resistance to alkalis and common organic solvents. In this embodiment, the addition of the inner stopper 6 prevents liquid from contacting the inner lower sleeve 3, ensuring that the liquid is in full contact with materials that meet food safety requirements, thus ensuring food safety. The cover 1 is made of PP. Specifically, in this embodiment, the liquid only contacts the PET inner upper sleeve 2, the LDPE inner stopper 6, and the PP cover 1.

[0050] It should be noted that an abutment ring is also provided on the outside of the inner stopper 6. The abutment ring extends away from the inner stopper 6, with its lower surface abutting against the bottle opening and its upper surface abutting against the inner surface of the inner upper sleeve 2. A rotation-stopping structure is also provided on the outer surface of the portion of the inner stopper 6 that extends into the bottle. The rotation-stopping structure abuts against the inner surface of the bottle, thereby ensuring a stable connection between the inner stopper 6 and the bottle and preventing the inner stopper 6 from rotating.

[0051] Furthermore, an anti-counterfeiting cover 7 is included, which is mounted on the outside of the cover 1, the inner upper cover 2, and the inner lower cover 3; the anti-counterfeiting cover 7 will be damaged when the cover 1 is opened. In this solution, the anti-counterfeiting effect is further enhanced by adding the anti-counterfeiting cover 7.

[0052] It should be noted that, to enhance the anti-counterfeiting effect, the anti-counterfeiting cover 7 is specifically an aluminum sleeve, which is mounted on the outer sides of the cover 1, the inner upper sleeve 2, the inner lower sleeve 3, and a portion of the outer surface of the wine bottle. When consumers rotate the cover 1 during consumption, the aluminum sleeve is irreversibly damaged, thereby achieving the anti-counterfeiting effect.

[0053] like Figure 7As shown, according to an embodiment of the present invention, on the other hand, a wine bottle is provided, comprising the above-mentioned anti-pulling bottle cap structure; further comprising: a bottle body 8 having an internal accommodation space; a wine bottle mouth is provided on the top of the bottle body 8; and the wine bottle mouth is suitable for the outflow of liquid from the bottle body 8. In this solution, since the material of the inner lower sleeve 3 is selected from engineering plastics, engineering plastics have high hardness and are not easy to soften at high temperatures, and can be significantly deformed and cannot be restored after softening, the problem of the bottle cap being pulled out intact after being deformed by heat is solved. In addition, since the inner lower sleeve 3 is made of engineering plastics, its hardness is also high, and the inner lower sleeve 3 is in contact with the wine bottle mouth. If it is forcibly pulled out by external force, the wine bottle mouth is easily damaged, thereby ensuring the anti-counterfeiting effect.

[0054] It should be noted that the bottle body 8 is a common glass wine bottle.

[0055] Furthermore, a boss 81 is provided at the end of the mouth of the wine bottle, and one side of the boss 81 is suitable for abutting against the abutment structure 4. It should be noted that the boss 81 is extended in a direction away from the bottle body 8, and is formed on the outer periphery of the bottle body 8. It should be noted that a mounting groove is formed between the lower surface of the boss 81 near the mouth of the wine bottle and the mouth of the wine bottle, and the mounting groove is suitable for accommodating the abutment structure 4. During the installation process, since the outer surface of the abutment structure 4 is an inclined surface, the outer surface of the boss 81 is also an inclined surface, and the outer surface of the abutment structure 4 is slidably connected to the outer surface of the boss 81 until the abutment structure 4 just enters the mounting groove. At this time, the abutment structure 4 and the boss 81 are engaged with each other, thereby achieving locking, thereby ensuring a stable connection between the inner lower sleeve 3 and the mouth of the wine bottle.

[0056] Furthermore, the outer surface of the wine bottle is also provided with abutment teeth 82. There are a number of abutment teeth 82, each of which is adapted to abut against the anti-rotation teeth 5. Accommodation grooves 83 are formed between adjacent abutment teeth 82, each of which is adapted to accommodate the anti-rotation teeth 5. Adjacent accommodating grooves 83 have different widths. By varying the widths between adjacent accommodating grooves 83, the risk of tooth overlap can be reduced. Tooth overlap refers to the situation where, during installation, two tooth structures are unable to fit into the gap between them, resulting in abutment and collision. This can lead to installation failure. In the related art, the abutment teeth 82 are uniformly arranged. Since the inner lower sleeve 3 and the wine bottle mouth are generally mechanically installed, uniformly arranged abutment teeth 82 are prone to tooth overlap, which can easily damage the bottle mouth and increase the scrap rate. To reduce the risk of tooth overlap, this solution significantly reduces the risk of tooth overlap by varying the size of the accommodating grooves 83 between adjacent abutment teeth 82.

[0057] It should be noted that, in this embodiment, the spacing between the abutting teeth 82 gradually increases from left to right.

[0058] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. An anti-lifting bottle cap structure, characterized in that: include: Cover (1); The inner upper sleeve (2) is suitable for connecting with the cover body (1); the material of the inner upper sleeve (2) is PET; The inner lower sleeve (3) is suitable for connecting with the inner upper sleeve (2), and the inner lower sleeve (3) is suitable for abutting against the mouth of the wine bottle; the inner upper sleeve (2) and the inner lower sleeve (3) are integrally formed by a two-color injection molding process; the material of the inner lower sleeve (3) is engineering plastic.

2. The anti-lifting bottle cap structure according to claim 1, characterized in that: Also includes: There is at least one abutting structure (4), and the abutting structure (4) is arranged on the inner side of the inner lower sleeve (3); one end of the abutting structure (4) is fixedly connected to the inner lower sleeve (3), and the other end is suitable for abutting against the mouth of the wine bottle; the thickness of the abutting structure (4) is 1.5mm-1.7mm.

3. The anti-lifting bottle cap structure according to claim 2, characterized in that: The bottom of the inner upper sleeve (2) is provided with a first clamping portion (21), and the top of the inner lower sleeve (3) is provided with a second clamping portion (31), and the second clamping portion (31) is suitable for clamping and connecting with the first clamping portion (21).

4. The anti-lifting bottle cap structure according to claim 3, characterized in that: Also includes: There are a plurality of stop teeth (5), one side of which is fixedly arranged on the inner side of the inner lower sleeve (3); the other side of which is suitable for contacting with the mouth of the wine bottle, and the stop teeth (5) are suitable for preventing the inner lower sleeve (3) from rotating.

5. The anti-lifting bottle cap structure according to claim 1, characterized in that: Also includes: The inner plug (6) is partially adapted to be inserted into the mouth of the wine bottle, and a circulation channel is formed inside the inner plug (6), and the circulation channel is adapted to be connected with the interior of the wine bottle; the top of the inner plug (6) is adapted to abut against the inner side of the inner upper sleeve (2), and the material of the inner plug (6) is LDPE material.

6. The anti-lifting bottle cap structure according to claim 1, characterized in that: The cover body (1) is connected to the inner upper sleeve (2) via threads.

7. The anti-lifting bottle cap structure according to claim 1, characterized in that: Also includes: An anti-counterfeiting outer cover (7) is sleeved on the outer sides of the cover body (1), the inner upper cover (2), and the inner lower cover (3); when the cover body (1) is opened, the anti-counterfeiting outer cover (7) will be damaged.

8. A wine bottle, characterized in that: The invention comprises the anti-lift-off bottle cap structure according to any one of claims 1 to 7; and further comprises: The bottle body (8) has a receiving space inside; the top of the bottle body (8) is provided with a wine bottle opening; the wine bottle opening is suitable for the liquid inside the bottle body (8) to flow out.

9. The wine bottle according to claim 8, characterized in that: The anti-lifting bottle cap structure has an abutment structure, and a boss (81) is provided at the end of the bottle mouth, and one side of the boss (81) is suitable for abutting against the abutment structure (4).

10. The wine bottle according to claim 9, characterized in that: The anti-lifting bottle cap structure has a rotation-stopping tooth, and the outer surface of the wine bottle is further provided with abutting teeth (82), and the abutting teeth (82) are multiple, and the abutting teeth (82) are suitable for abutting with the rotation-stopping teeth (5). Accommodating grooves (83) are formed between adjacent abutting teeth (82), and the accommodating grooves (83) are suitable for accommodating the rotation-stopping teeth (5). The widths of adjacent accommodating grooves (83) are different.

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