Middle bundle core and packaging tube

Abstract

The embodiment of the utility model provides a median bundle core and a packaging tube. The median bundle core comprises a containing part used for containing paste; the first sleeve is arranged outside the containing part in a sleeving mode and is movably connected with the containing part in the axial direction; the top end of the screw is connected with the bottom end of the accommodating part; the second sleeve at least partially sleeves the screw, the inner peripheral wall of the second sleeve is in threaded connection with the outer peripheral wall of the screw, and the top end of the second sleeve and the bottom end of the first sleeve are coaxial, mutually limited in the axial direction and rotatably connected in the circumferential direction; the second sleeve is driven by external force to rotate relative to the first sleeve, so that the screw drives the containing piece to move close to or away from the second sleeve in the axial direction. According to the embodiment, the containing part is driven to ascend and descend in the mode that the screw and the second sleeve are spirally connected, the radial size can be reduced as much as possible compared with a sleeve in the related technology, therefore, the radial size of the median bundle core can be reduced, the slender development of the median bundle core and the packaging pipe is facilitated, then the user experience can be enhanced, and carrying is convenient.

Description

Technical Field

[0001] This application relates to the field of article packaging technology, and more specifically, to a central core and packaging tube. Background Technology

[0002] As times change, users are paying more and more attention to health and personal image, leading to increasingly diverse demands for packaging tubes. For example, packaging tubes can serve as outer packaging for cosmetics or skincare products such as lipsticks and lip glosses, making them convenient for users to use.

[0003] With the concept of green development gaining widespread acceptance, conserving, recycling, and efficiently utilizing resources is a crucial development trend now and in the future. Therefore, the replaceable design of packaging tubes is extremely important. Packaging tubes generally consist of a core containing the ointment and an outer sleeve that houses the core.

[0004] The radial dimension of the central core in related technologies is difficult to reduce, which is not conducive to the development of slender packaging tubes. Utility Model Content

[0005] This application addresses the shortcomings of existing methods by proposing a middle core and packaging tube to solve the technical problem that the radial dimension of the middle core is difficult to reduce in the prior art.

[0006] In a first aspect, embodiments of this application provide a middle core, comprising:

[0007] A container for holding paste;

[0008] The first sleeve is fitted outside the receiving part and is axially movable and connected to the receiving part;

[0009] The screw, with its top end connected to the bottom end of the housing;

[0010] The second sleeve is at least partially sleeved outside the screw, with its inner circumferential wall threaded to the outer circumferential wall of the screw, and its top end coaxial with the bottom end of the first sleeve, mutually limited along the axial direction and rotatably connected along the circumferential direction.

[0011] The second sleeve rotates relative to the first sleeve under the drive of an external force, causing the screw to move the receiving part axially closer to or away from the second sleeve.

[0012] In some possible embodiments, the outer peripheral wall of a portion of the receiver is recessed inward to form a first limiting tooth protruding from the inner peripheral wall of the receiver, the bottom end of the first limiting tooth being spaced apart from the bottom wall of the receiver.

[0013] In some possible embodiments, the outer peripheral wall of the receiver has an outwardly protruding second limiting tooth;

[0014] The inner circumferential wall of the first sleeve has a groove extending axially;

[0015] The second limiting tooth and the slot can be axially slidably connected.

[0016] In some possible embodiments, the housing and the screw are integrated into one structure;

[0017] Alternatively, the bottom of the housing has a through hole, and the top of the screw is inserted into and fixed in the through hole.

[0018] In some possible embodiments, the inner peripheral wall of the bottom end of the first sleeve has an inwardly extending first locking tooth ring; the radial dimension of the first locking tooth ring gradually decreases along the axial direction and toward the second sleeve.

[0019] The outer peripheral wall of the top end of the second sleeve has a first annular groove; the radial dimension of the first annular groove gradually decreases along the axial direction and away from the first sleeve.

[0020] The bottom end of the first sleeve is fitted over the top end of the second sleeve, and the first locking toothed ring is circumferentially connected to the first annular groove.

[0021] In some possible embodiments, the top wall and peripheral wall of the first locking toothed ring form a right angle in the axial plane of the first sleeve;

[0022] In the axial plane of the second sleeve, the top wall and the peripheral wall of the first annular groove form a right angle at their connection.

[0023] In some possible embodiments, the radial dimension of the first locking toothed ring gradually decreases along the axial direction and toward the second sleeve until it is flush with the inner circumferential wall of the first sleeve.

[0024] The sidewall shape of the first annular groove matches the sidewall shape of the first locking tooth ring.

[0025] In some possible embodiments, the inner peripheral wall of the bottom end of the first sleeve has a second annular groove, which is connected above the first locking toothed ring;

[0026] The outer peripheral wall of the top end of the second sleeve has a second locking toothed ring, which is connected above the first annular groove;

[0027] The second annular groove is circumferentially connected to the second locking toothed ring.

[0028] In some possible embodiments, the peripheral wall at the bottom end of the first sleeve has an inwardly protruding limiting protrusion, and the outer peripheral wall at the top end of the second sleeve has a limiting groove.

[0029] Along the radial direction toward the center of the first sleeve, the sidewall of the limiting protrusion has a smooth curve and is configured to slide into the limiting groove during the rotation of the first sleeve relative to the second sleeve.

[0030] Secondly, embodiments of this application provide a packaging tube, including any of the intermediate cores provided in the first aspect above.

[0031] The beneficial technical effects of the technical solutions provided in this application include:

[0032] In this embodiment, a screw and a second sleeve are connected in a spiral to drive the lifting and lowering of the receiving component. This eliminates the need for sleeves with perforated through-holes or spiral grooves as used in related technologies. The screw can be designed as a solid structure, minimizing the radial dimension while ensuring rigidity, resulting in a slender shape. The inner wall of the second sleeve only needs a shallow spiral groove, with an inner diameter sufficient to accommodate the slender screw. This also minimizes the radial dimension compared to sleeves in related technologies, thereby reducing the radial dimension of the central core. This facilitates the slender development of the central core and packaging tube, enhancing the user experience and making it easier to carry.

[0033] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0034] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0035] Figure 1 An exploded view of a middle core provided in an embodiment of this application;

[0036] Figure 2 This is a schematic diagram of the structure of a housing for a middle core provided in an embodiment of this application;

[0037] Figure 3 This is a schematic diagram of the structure of the second sleeve of the middle core provided in an embodiment of this application;

[0038] Figure 4 This is a front view structural diagram of a middle core provided in an embodiment of this application;

[0039] Figure 5 The middle core provided in the embodiments of this application corresponds to one state. Figure 4 A cross-sectional view of the middle line AA';

[0040] Figure 6 The middle core provided in the embodiments of this application corresponds to another state of the middle core. Figure 4 A cross-sectional view of the middle line AA';

[0041] Figure 7 This is a schematic diagram of another structure of the middle core provided in an embodiment of this application;

[0042] Figure 8 for Figure 7 A cross-sectional view at the midline CC';

[0043] Figure 9 for Figure 8 A magnified view of a portion of point B in the middle;

[0044] Figure 10 A front view of the first sleeve of another middle core provided in an embodiment of this application;

[0045] Figure 11 for Figure 10 A cross-sectional view at the midline DD';

[0046] Figure 12 A structural schematic diagram from another perspective of the first sleeve of another middle core provided in an embodiment of this application;

[0047] Figure 13 This is a schematic diagram of the structure of the second sleeve of another middle core provided in an embodiment of this application.

[0048] Figure label:

[0049] 100-medium beam core;

[0050] 10-Receiving component; 11-First limiting tooth; 12-Second limiting tooth; 101-Groove;

[0051] 20-First sleeve; 21-Slot; 22-First locking toothed ring; 23-Second annular groove; 24-Limiting protrusion;

[0052] 30-Screw;

[0053] 40 - Second sleeve; 41 - First annular groove; 42 - Second locking toothed ring; 43 - Limiting groove. Detailed Implementation

[0054] The embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions of the embodiments of this application.

[0055] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be understood that the term “comprising” as used in this application's specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude implementations of other features, information, data, elements, components, and / or combinations thereof supported by this art. It should be understood that when we say an element is “connected” or “coupled” to another element, the element may be directly connected or coupled to the other element, or it may mean that the element and the other element are connected through an intermediate element. The term “and / or” as used herein refers to at least one of the items defined by the term; for example, “A and / or B” can be implemented as “A,” or as “B,” or as “A and B.”

[0056] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0057] The applicant's research found that, with changing times, users are paying more and more attention to body care and personal image, leading to increasingly diverse demands for packaging tubes. For example, packaging tubes can serve as outer packaging for cosmetics or skincare products such as lipsticks and lip glosses, making them convenient for users to use.

[0058] With the concept of green development gaining widespread acceptance, conserving, recycling, and efficiently utilizing resources is a crucial development trend now and in the future. Therefore, the replaceable design of packaging tubes is extremely important. Packaging tubes typically consist of a core containing the ointment and an outer sleeve that houses the core. Making the core and outer sleeve detachable allows for replacement of the core, and consequently, the ointment.

[0059] The related technology includes a receiving element (or bead) and two sleeves stacked around the receiving element. One sleeve has a vertical (or axial) through-hole groove, which can be called a fork, and the other sleeve has a spiral groove, which can be called a screw. The outer peripheral wall of the receiving element has a protrusion that extends into both the through-hole groove and the spiral groove, so that the receiving element moves only vertically without rotating, realizing the function of the ointment contained in the receiving element only rising and falling without rotating.

[0060] Therefore, the through-hole groove must be hollow to allow the protrusion to pass through. However, to ensure good rigidity of the sleeve, given a fixed sleeve thickness and material, the through-hole groove significantly affects the rigidity of the fork, making it difficult to further reduce the radial dimension of the fork and hindering the development of slender packaging tubes.

[0061] The middle core and packaging tube provided in this application are intended to solve the above-mentioned technical problems of the prior art.

[0062] The technical solution of this application and how it solves the above-mentioned technical problems are described in detail below with specific embodiments. It should be noted that the following embodiments can be referenced, borrowed, or combined with each other, and the same terms, similar features, and similar implementation steps in different embodiments will not be described again.

[0063] This application provides a middle beam core 100, the exploded view of which is shown below. Figure 1 As shown, the middle core 100 includes: a receiving member 10, a first sleeve 20, a screw 30, and a second sleeve 40.

[0064] The container 10 is used to contain the paste.

[0065] The first sleeve 20 is fitted outside the receiving member 10 and is axially movable and connected to the receiving member 10.

[0066] The top end of the screw 30 is connected to the bottom end of the housing 10.

[0067] The second sleeve 40 is at least partially sleeved outside the screw 30, with its inner circumferential wall threaded to the outer circumferential wall of the screw 30. Its top end is coaxial with the bottom end of the first sleeve 20, mutually limiting each other along the axial direction and rotatably connected along the circumferential direction.

[0068] The second sleeve 40 rotates relative to the first sleeve 20 under the drive of an external force, causing the screw 30 to drive the receiving member 10 to move axially closer to or away from the second sleeve 40.

[0069] In this embodiment, the first sleeve 20 and the receiving member 10 are axially movable and circumferentially fixed. Since the second sleeve 40 is threadedly connected to the screw 30, the second sleeve 40 rotates circumferentially relative to the first sleeve 20 under external force, which can drive the screw 30 to rise and fall. Since the screw 30 is fixedly connected to the bottom end of the receiving member 10, the rising and falling of the screw 30 can drive the receiving member 10 to rise and fall. Therefore, in this embodiment, the circumferential rotation of the second sleeve 40 relative to the first sleeve 20 is transformed into the axial rising and falling movement of the receiving member 10 driven by the screw 30. That is, the receiving member 10 moves closer to or away from the second sleeve 40, and during the axial movement, the receiving member 10 is circumferentially fixed relative to the first sleeve 20, thus realizing the function of the ointment contained in the receiving member 10 only rising and falling without rotating.

[0070] Therefore, in this embodiment, the screw 30 and the second sleeve 40 are spirally connected to drive the receiving member 10 to rise and fall. This eliminates the need for the fork with perforated slots found in related technologies. That is, neither the first sleeve 20 nor the second sleeve 40 needs any perforated structures on their side walls. This allows for minimizing the radial dimension while maintaining rigidity, resulting in a slender form. Furthermore, the inner wall of the second sleeve 40 only needs a shallow spiral groove, with an inner diameter sufficient to accommodate the slender screw 30, allowing for a thinner structure without compromising rigidity.

[0071] Furthermore, in this embodiment, the screw 30 can be designed as a solid structure without any hollow parts, which can minimize the radial dimension while ensuring rigidity, resulting in a slender shape. In addition, this embodiment uses the screw 30 to achieve the lifting function, eliminating the need to add a screw outside the fork, thus omitting the screw structure, which is also beneficial to the slender development of the middle core.

[0072] In summary, the embodiments of this application can reduce the radial dimension of the middle core 100 as a whole, which is conducive to the slender development of the middle core 100 and the packaging tube, thereby enhancing the user experience and making it easier to carry.

[0073] For reference Figures 4-6 ,in, Figure 5 The diagram shows the state of the housing 10 when it is raised to its highest position. Figure 6 A diagram showing the state of the housing 10 when it is lowered to its lowest position is displayed.

[0074] Optionally, the paste may include cosmetic ingredients, such as lipstick or lip gloss paste.

[0075] Optionally, the paste may include a skin care product, for example, the paste may be the paste of a lipstick, etc.

[0076] It should be noted that in the embodiments of this application, "axial" refers to the length direction of the middle core 100 (or other structure), and "radial" refers to the diameter or radius direction of the middle core 100 (or other structure).

[0077] Optionally, the middle core 100 provided in this application embodiment is a structure made of pure metal, which is easy to recycle and reuse, and is conducive to sustainable development.

[0078] In some possible embodiments, such as Figure 2 and Figure 5 As shown, the outer peripheral wall of part of the receiving member 10 is recessed inward to form a first limiting tooth 11 protruding from the inner peripheral wall of the receiving member 10. The bottom end of the first limiting tooth 11 is spaced from the bottom wall of the receiving member 10.

[0079] In this embodiment, the outer peripheral wall of the receiving member 10 has multiple inward recesses, forming grooves 101 on the outer peripheral wall, and multiple protruding first limiting teeth 11 on the inner peripheral wall. The bottom end of the first limiting teeth 11 is spaced from the bottom wall of the receiving member 10. When the paste is placed in the receiving member 10, the first limiting teeth 11 can be embedded in the paste and mutually constrain each other with the paste, thereby improving the connection stability between the paste and the receiving member 10 and reducing the risk of the paste detaching from the receiving member 10.

[0080] Optionally, the multiple first limiting teeth 11 are arranged with circumferential spacing.

[0081] In some possible embodiments, such as Figure 2 and Figure 6 As shown, the outer peripheral wall of the receiving member 10 has a second limiting tooth 12 protruding outward.

[0082] The inner peripheral wall of the first sleeve 20 has a groove 21 extending axially.

[0083] The second limiting tooth 12 and the slot 21 can be axially slidably connected.

[0084] In this embodiment, the second limiting tooth 12 and the slot 21 are axially slidably connected, guiding the receiving member 10 to move circumferentially, ensuring that the receiving member 10 is relatively fixed relative to the first sleeve 20 circumferentially, thereby ensuring the stability of the paste within the receiving member 10 and reducing the risk of the paste falling out of the core bundle 100 due to rotation, etc. In some possible embodiments, the receiving member 10 and the screw 30 are an integral structure.

[0085] In this embodiment, the receiving member 10 and the screw 30 can be integrally molded, which is convenient for manufacturing and can also ensure the connection stability between the receiving member 10 and the screw 30.

[0086] In some possible embodiments, such as Figure 5 As shown, the bottom of the receiving part 10 has a through hole, and the top of the screw 30 is embedded and fixed in the through hole.

[0087] In this embodiment, the housing 10 and the screw 30 can be manufactured separately and detachably connected, which improves applicability. Furthermore, the housing 10 and the screw 30 can be manufactured using different materials for different applications, facilitating sorting and recycling.

[0088] In some possible embodiments, please refer to Figure 3 , Figure 8 as well as Figure 9 The inner circumferential wall at the bottom end of the first sleeve 20 has an inwardly extending first locking toothed ring 22. The radial dimension of the first locking toothed ring 22 gradually decreases along the axial direction and towards the second sleeve 40.

[0089] The outer peripheral wall of the top end of the second sleeve 40 has a first annular groove 41. The radial dimension of the first annular groove 41 gradually decreases along the axial direction and away from the first sleeve 20.

[0090] The bottom end of the first sleeve 20 is fitted over the top end of the second sleeve 40, and the first locking toothed ring 22 is rotatably connected to the first annular groove 41 in a circumferential direction.

[0091] In this embodiment, the radial dimension of the first locking tooth ring 22 gradually decreases along the axial direction and close to the second sleeve 40. When the bottom end of the first sleeve 20 is moved relative to the second sleeve 40 by an external force, it slowly slides from the thinner part of the first locking tooth ring 22 toward the first annular groove 41 of the second sleeve 40, thereby making the first locking tooth ring 22 at least partially embedded in the first annular groove 41, forming the first interlocking structure, so that the bottom end of the first sleeve 20 is fixedly sleeved on the top end of the second sleeve 40 along the axial direction, and the two are fixed relative to each other along the axial direction, but can rotate relative to each other in the circumferential direction.

[0092] Moreover, the radial dimension of the first locking toothed ring 22 gradually decreases along the axial direction and close to the second sleeve 40, that is, the radial dimension of the first locking toothed ring 22 gradually increases along the axial direction and away from the second sleeve 40, thereby reducing the possibility of the first sleeve 20 disengaging from the second sleeve 40 and enhancing the axial connection stability between the first sleeve 20 and the second sleeve 40.

[0093] Optionally, the outer peripheral wall of the middle part of the second sleeve 40 is provided with multiple ridges in sequence along the circumference. The outer peripheral walls between adjacent ridges form a planar peripheral wall. The planes on which each peripheral wall is located are different, which makes it easier for the user to hold the second sleeve and apply force to drive the second sleeve to rotate, thereby increasing the friction between the user's fingers and the second sleeve and improving the rotation efficiency.

[0094] In some possible embodiments, please refer to Figure 9 In the axial plane of the first sleeve 20, the top wall and the peripheral wall of the first locking toothed ring 22 form a right angle at the connection.

[0095] In the axial plane of the second sleeve 40, the top wall and the peripheral wall of the first annular groove 41 form a right angle at the connection.

[0096] In this embodiment, the top wall and the peripheral wall of the first locking tooth ring 22 form a right angle, and the right angle of the first locking tooth ring 22 forms a sharp point, which is mutually constrained with the right angle of the first annular groove 41. It is difficult for the first sleeve 20 to move away from the second sleeve 40 or even cause the first sleeve 20 to detach from the second sleeve 40. This can reduce the risk of the first sleeve 20 detaching from the second sleeve 40 and ensure the structural stability of the middle core 100.

[0097] In some possible embodiments, please refer to Figure 9The radial dimension of the first locking toothed ring 22 gradually decreases along the axial direction and close to the second sleeve 40 until it is flush with the inner circumferential wall of the first sleeve 20.

[0098] The sidewall shape of the first annular groove 41 matches the sidewall shape of the first locking tooth ring 22.

[0099] In this embodiment, the radial dimension of the first locking tooth ring 22 is gradually changed, so that the bottom end of the first sleeve 20 is gradually fitted over the top end of the second sleeve 40, which can improve the installation efficiency, reduce the wear rate of the first locking tooth ring 22, and ensure the structural stability of the first locking tooth ring 22.

[0100] In some possible embodiments, please refer to Figure 9 The inner circumferential wall at the bottom end of the first sleeve 20 has a second annular groove 23, which is connected above the first locking toothed ring 22.

[0101] The outer peripheral wall of the top end of the second sleeve 40 has a second locking toothed ring 42, which is connected above the first annular groove 41.

[0102] The second annular groove 23 is rotatably connected to the second locking toothed ring 42 in a circumferential direction.

[0103] In this embodiment, the second annular groove 23 and the second locking toothed ring 42 are interlocked to form a second interlocking structure. The two are fixed relative to each other in the axial direction, but can rotate relative to each other in the circumferential direction, which further improves the axial connection stability between the first sleeve 20 and the second sleeve 40 and reduces the possibility of the first sleeve 20 disengaging from the second sleeve 40.

[0104] Furthermore, the second annular groove 23 is connected above the first locking toothed ring 22, and the second locking toothed ring 42 is connected above the first annular groove 41, so that the first locking toothed ring 22 and the second locking toothed ring 42 can engage with each other and play a limiting role.

[0105] In some possible embodiments, please refer to Figure 9 The outer diameter of the outer peripheral wall of the top end of the second sleeve 40 (i.e. the outer peripheral wall of the second locking toothed ring 42) gradually increases along the axial direction and away from the first sleeve 20.

[0106] In this embodiment, when the bottom end of the first sleeve 20 is moved relative to the second sleeve 40 by an external force, the top end of the second sleeve 40 undergoes elastic deformation under the squeezing action of the first sleeve 20. The inward deformation reduces the radial dimension, and the outer diameter of the outer peripheral wall of the top end of the second sleeve 40 gradually increases along the axial direction away from the first sleeve 20. This facilitates the first sleeve 20 to move downward from the point of minimum radial dimension until the first locking toothed ring 22 is completely embedded in the first annular groove 41, thereby improving the ease of installation.

[0107] Please refer to Figures 7-13 This application also provides another type of middle core 100, wherein the peripheral wall at the bottom end of the first sleeve 20 has an inwardly protruding limiting protrusion 24, and the outer peripheral wall at the top end of the second sleeve 40 has a limiting groove 43.

[0108] Along the radial direction toward the center of the first sleeve 20, the sidewall of the limiting protrusion 24 is a smooth curve and is configured to slide into the limiting groove 43 during the rotation of the first sleeve 20 relative to the second sleeve 40.

[0109] In this embodiment, reference Figure 10 The bottom peripheral wall of the first sleeve 20 forms a recessed point relative to the outer peripheral wall and a limiting protrusion 24 relative to the inner peripheral wall. Combined with... Figure 13 During the rotation of the first sleeve 20 relative to the second sleeve 40, when the first sleeve 20 rotates one revolution, the limiting protrusion 24 slides into the limiting groove 43 once, so that the user knows that the first sleeve 20 has rotated a full revolution, making it easier for the user to judge the rotation status.

[0110] In some possible embodiments, the top end of the second sleeve 40 has a stepped surface, and the bottom end of the first sleeve 20 is fitted onto the top end of the second sleeve 40, so that the end face of the bottom end of the first sleeve 20 abuts against the stepped surface of the second sleeve 40. This prevents the first sleeve 20 and the second sleeve 40 from being fitted too deeply during installation, which could cause structural damage to the first sleeve 20 or the second sleeve 40, thereby improving the yield rate during the installation of the middle core 100.

[0111] Optionally, refer to Figure 11 and Figure 12 The slot 21 extends longitudinally to the bottom edge of the first sleeve 20, and the second annular groove 23 extends radially along the first sleeve 20 and passes through the lower part of each slot 21.

[0112] Based on the same inventive concept, this application provides a packaging tube, including any of the central cores 100 provided in the above embodiments.

[0113] The packaging tube provided in this embodiment includes any of the middle core 100 provided in the above embodiments, and their implementation principles are similar, so they will not be described again here.

[0114] In some possible embodiments, the packaging tube further includes an outer sleeve and a cap, which are fitted together. The middle core 100 is disposed within the space where the outer sleeve and the cap are fitted together. The receiving member 10 of the middle core 100 is at least partially disposed within the cap. The second sleeve 40 of the middle core 100 is fixedly connected to the outer sleeve, thereby fixing the first sleeve 20 of the middle core 100. Rotating the exposed outer sleeve will allow the second sleeve 40 to rotate relative to the first sleeve 20, which in turn causes the screw 30 to drive the receiving member 10 to move axially closer to or away from the second sleeve 40. This achieves the function that the ointment contained in the receiving member 10 only moves up and down without rotating.

[0115] By applying some embodiments of this application, at least the following beneficial effects can be achieved:

[0116] 1. In this embodiment, the screw 30 and the second sleeve 40 are spirally connected to drive the receiving member 10 to rise and fall. This eliminates the need for the fork with perforated slots found in related technologies. That is, neither the first sleeve 20 nor the second sleeve 40 needs any perforated structure on their sidewalls. This allows for minimizing the radial dimension while maintaining rigidity, resulting in a slender form. Furthermore, the inner wall of the second sleeve 40 only needs a shallow spiral groove, with an inner diameter sufficient to accommodate the slender screw 30, allowing for a thinner structure without compromising rigidity.

[0117] 2. In this embodiment, the screw 30 can be designed as a solid structure without any hollow parts, which can minimize the radial dimension while ensuring rigidity and present a slender state. Furthermore, this embodiment uses the screw 30 to realize the lifting function, eliminating the need to add a screw outside the fork, thus omitting the screw structure, which is also conducive to the slender development of the middle core.

[0118] 3. Multiple inwardly recessed areas are formed on the outer peripheral wall of the container 10, forming multiple first limiting teeth 11 protruding from the inner peripheral wall of the container 10. The bottom end of the first limiting teeth 11 is spaced from the bottom wall of the container 10. When the paste is placed inside the container 10, the first limiting teeth 11 can be embedded in the paste and mutually constrain each other with the paste, thereby improving the connection stability between the paste and the container 10 and reducing the risk of the paste detaching from the container 10.

[0119] 4. The radial dimension of the first locking toothed ring 22 gradually decreases along the axial direction and towards the second sleeve 40. When the bottom end of the first sleeve 20 is moved relative to the second sleeve 40 by an external force, it slowly slides from the thinner part of the first locking toothed ring 22 towards the first annular groove 41 of the second sleeve 40, thereby making the first locking toothed ring 22 completely embedded in the first annular groove 41, forming the first interlocking structure, so that the bottom end of the first sleeve 20 is fixedly sleeved on the top end of the second sleeve 40 along the axial direction. Moreover, the radial dimension of the first locking toothed ring 22 gradually decreases along the axial direction and towards the second sleeve 40, that is, the radial dimension of the first locking toothed ring 22 gradually increases along the axial direction and away from the second sleeve 40, thereby reducing the possibility of the first sleeve 20 disengaging from the second sleeve 40 and enhancing the axial connection stability between the first sleeve 20 and the second sleeve 40.

[0120] 5. The second annular groove 23 and the second locking toothed ring 42 are interlocked to form a second interlocking structure, which further improves the axial connection stability between the first sleeve 20 and the second sleeve 40 and reduces the possibility of the first sleeve 20 disengaging from the second sleeve 40.

[0121] In the description of this application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate directions or positional relationships based on the exemplary directions or positional relationships shown in the accompanying drawings. They are used to facilitate the description or simplification of the embodiments of this application and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0122] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0123] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0124] The above description is only a partial implementation of this application. It should be noted that for those skilled in the art, other similar implementation methods based on the technical concept of this application, without departing from the technical concept of this application, also fall within the protection scope of the embodiments of this application.

Claims

1. A middle-beam core, characterized in that, include: A container for holding paste; The first sleeve is fitted outside the receiving member and is axially movable and connected to the receiving member; The screw, with its top end connected to the bottom end of the receiving component; The second sleeve is at least partially sleeved outside the screw, with its inner circumferential wall threaded to the outer circumferential wall of the screw, and its top end coaxial with the bottom end of the first sleeve, mutually limited along the axial direction and rotatably connected along the circumferential direction. The second sleeve rotates relative to the first sleeve under the drive of an external force, causing the screw to drive the receiving member to move axially closer to or away from the second sleeve.

2. The middle core according to claim 1, characterized in that, The outer peripheral wall of a portion of the receiving element is recessed inward to form a first limiting tooth protruding from the inner peripheral wall of the receiving element, and the bottom end of the first limiting tooth is spaced apart from the bottom wall of the receiving element.

3. The middle core according to claim 1, characterized in that, The outer peripheral wall of the receiving member has a second limiting tooth protruding outward; The inner peripheral wall of the first sleeve has a groove extending along the axial direction; The second limiting tooth is axially slidably connected to the slot.

4. The middle core according to claim 1, characterized in that, The receiving component and the screw are integrated into one structure; Alternatively, the bottom of the receiving member has a through hole, and the top of the screw is embedded and fixed in the through hole.

5. The middle core according to claim 1, characterized in that, The inner peripheral wall at the bottom end of the first sleeve has an inwardly extending first locking tooth ring; the radial dimension of the first locking tooth ring gradually decreases along the axial direction and towards the second sleeve. The outer peripheral wall of the top end of the second sleeve has a first annular groove; the radial dimension of the first annular groove gradually decreases along the axial direction and away from the first sleeve. The bottom end of the first sleeve is fitted over the top end of the second sleeve, and the first locking toothed ring is circumferentially rotatably connected to the first annular groove.

6. The middle core according to claim 5, characterized in that, Within the axial plane of the first sleeve, the connection between the top wall and the peripheral wall of the first locking toothed ring forms a right angle; In the axial plane of the second sleeve, the top wall and the peripheral wall of the first annular groove form a right angle at their connection.

7. The middle core according to claim 5, characterized in that, The radial dimension of the first locking toothed ring gradually decreases along the axial direction and towards the second sleeve until it is flush with the inner circumferential wall of the first sleeve. The sidewall shape of the first annular groove matches the sidewall shape of the first locking tooth ring.

8. The middle core according to claim 5, characterized in that, The inner circumferential wall at the bottom end of the first sleeve has a second annular groove, which is connected above the first locking toothed ring; The outer peripheral wall of the top end of the second sleeve has a second locking toothed ring, which is connected above the first annular groove; The second annular groove is circumferentially connected to the second locking toothed ring.

9. The middle core according to claim 1, characterized in that, The bottom peripheral wall of the first sleeve has an inwardly protruding limiting protrusion, and the top peripheral wall of the second sleeve has a limiting groove. Along the radial direction toward the center of the first sleeve, the sidewall of the limiting protrusion has a smooth curve and is configured to slide into the limiting groove during the rotation of the first sleeve relative to the second sleeve.

10. A packaging tube, characterized in that, include: The mid-beam core as described in any one of claims 1-9 above.

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