Packaging tube

Abstract

A kind of packing tube, including middle beam core (1) and base (2), middle beam core (1) and base (2) are all with metal material, middle beam core (1) has spatial axial direction, middle beam core (1) includes pearl (12), fork (11) and spiral (10) in sequence from inside to outside, the inner wall of spiral (10) has thread structure (100), when spiral (10) rotates relative to fork (11), thread structure (100) drives pearl (12) to slide relative to fork (11) along axial direction, between fork (11) and base (2), there is the matching structure that can be relatively inserted and pulled along axial direction, and the matching structure limits the relative movement of fork (11) and base (2) in axial direction and peripheral direction. Relies on the structural strength of packing tube metal material itself specific to improve the stability of cooperation, and improve the overall quality of packing tube.

Description

TECHNICAL FIELD

[0001] The application relates to a cosmetic packaging tube, in particular a cosmetic packaging tube with replaceable middle core made of metal. BACKGROUND

[0002] A lipstick packaging tube is generally composed of a top cover, a base and a middle core, the base and the middle core are fixedly connected, and the top cover and the base cooperatively form a cavity surrounding the middle core. The middle core is generally composed of a middle beam, a spiral, a fork and a bead.

[0003] Most of the existing lipstick packaging tubes are made of plastic parts. On the one hand, it is convenient for injection molding to obtain a complex structure, which is conducive to the early design and late assembly. On the other hand, the manufacturing cost is low. However, the plastic parts have the disadvantages of easy variability and weak corrosion resistance. After long-term use, the matching structure of the lipstick tube is loose, which causes the internal cream to stretch and the top cover to be not tightly closed, thereby seriously affecting the user's experience and product stability. (At present, the international community has a ban on plastic requirements, and all-aluminum packaging tubes meet the future green development trend). SUMMARY

[0005] TECHNICAL PROBLEM

[0006] The application provides a cosmetic packaging tube with replaceable middle core made of all-metal material.

[0007] SOLUTION TO THE PROBLEM

[0008] TECHNICAL SOLUTION

[0009] A packaging tube comprises a middle core and a base, both of which are made of metal material, the middle core has an axial direction in space, and the middle core comprises a bead, a fork and a spiral from inside to outside, wherein the inner wall of the spiral has a threaded structure, and when the spiral rotates relative to the fork, the threaded structure drives the bead to slide relative to the fork along the axial direction, the fork and the base are provided with an adaptive structure which can be relatively inserted and pulled in the axial direction, and the adaptive structure limits the relative movement of the fork and the base in the axial and circumferential directions.

[0010] The following also provides several optional modes, but not as an additional limitation to the above overall scheme, just a further supplement or preferred, without technical or logical contradiction, each optional mode can be combined with the above overall scheme, and can also be combined between multiple optional modes.

[0011] Optionally, the bottom of the fork is provided with a insertion hole, or the bottom of the fork is fixed with a connection seat with an insertion hole, and the base is provided with a plug matched with the insertion hole;

[0012] The insertion hole and the plug adopt a non-circular cross-sectional shape at least in part to limit the circumferential movement of each other.

[0013] Optionally, the insertion hole is a through hole or a blind hole.

[0014] Optionally, the inner wall of the insertion hole extends axially to form an insertion sleeve for accommodating the plug.

[0015] Optionally, the cross-sectional shape of the mating part of the insertion hole and the plug is a polygon.

[0016] Optionally, the polygon is a regular polygon, and the number of sides is 4-8.

[0017] Optionally, the cross-sectional shape of the insertion hole is uniform and adapted to the cross-sectional shape of the plug.

[0018] Optionally, the axial length of the mating part of the insertion hole and the plug is not less than 3mm.

[0019] Optionally, the top edge of the plug has a chamfered structure.

[0020] Optionally, the base includes an outer base and an inner base located in the outer base, the inner base includes a fixing disc and a columnar part protruding axially from the middle part of the fixing disc, and the columnar part serves as the plug.

[0021] Optionally, the fixing disc and the outer base are directly or indirectly fixed to each other by at least one of the following methods:

[0022] Interference fit;

[0023] Adhesion;

[0024] Welding;

[0025] Snap structure.

[0026] Optionally, the plug adopts a non-circular cross-sectional shape only at the part adjacent to the fixing disc.

[0027] Optionally, the outer periphery of the fixing disc is adjacent to the inner wall of the outer base.

[0028] Optionally, the outer periphery of the fixing disc has a flange, and the outer periphery of the flange abuts against the inner wall of the outer base.

[0029] Optionally, one of the fork and the base has a radially extending positioning part, and the other has a positioning groove for receiving the positioning part, and the fork and the base limit the axial movement of each other through the cooperating positioning part and positioning groove.

[0030] Optionally, the positioning part is a plurality of positioning bumps or an annular positioning rib arranged at intervals.

[0031] Optionally, the positioning part is protruded from the outer wall of the plug, and the positioning groove is formed in the inner wall of the socket.

[0032] Optionally, the base comprises an outer base and an inner base located in the outer base, the inner base comprises a fixing disc and a columnar part protruded from the middle part of the fixing disc in the axial direction, and the columnar part is the plug.

[0033] The edge part of the fixing disc extends in the axial direction to form a skirt wrapped around the outer periphery of the fork, the positioning part is located inside the skirt, and the positioning groove is formed in the outer wall of the fork.

[0034] Optionally, the skirt comprises a plurality of unit pieces arranged at intervals in the circumferential direction, and the positioning part is distributed on at least two unit pieces.

[0035] Optionally, the fork is provided with a bottom opening, the bottom opening is provided with an inward flange, the connecting seat comprises an annular part superimposed with the inward flange, and a plug-in sleeve protruding from the inner edge of the annular part into the bottom opening in the axial direction, and the inner part of the plug-in sleeve is the socket.

[0036] Optionally, the annular part is provided with an axial undulating structure, and the base and the fork are abutted and pre-tightened through the undulating structure.

[0037] Optionally, the undulating structure is formed by a plurality of protruding parts arranged at intervals, and the protruding directions of the protruding parts are the same in the axial direction and are directed towards the fork.

[0038] Optionally, the plurality of protruding parts are uniformly distributed in the axial direction, and the radial positions of the plurality of protruding parts are adjacent to the plug-in sleeve.

[0039] Optionally, the fork and the base are limited from moving in the axial direction by magnetic attraction.

[0040] Optionally, the base comprises an outer base and an inner base located in the outer base, the inner base comprises a fixing disc and a columnar part protruded from the middle part of the fixing disc in the axial direction, and the columnar part is the plug.

[0041] A first attracting part is clamped and fixed between the outer base and the inner base, and a second attracting part magnetically attracted to the first attracting part is fixed on the fork.

[0042] Optionally, the outer periphery of the fixing disc is provided with a flange facing away from the fork, and the first attracting part is surrounded in the flange.

[0043] Optionally, the second attracting part is annular and surrounds the outer periphery of the fork.

[0044] Optionally, the fork is provided with a bottom opening, and the bottom opening is provided with an inward flange, the connecting seat comprises a ring-shaped portion superposed with the inward flange, and a plug-in sleeve axially extending into the bottom opening from an inner edge of the ring-shaped portion, and an inner portion of the plug-in sleeve is the insertion hole;

[0045] An inner fold is arranged at a bottom of the second suction member, and the inner fold is fixedly clamped between the inward flange and the ring-shaped portion.

[0046] Optionally, a top edge of the plug-in sleeve is rolled and wrapped around an inner edge of the inward flange.

[0047] A bottom of the spiral is shielded from an outer periphery of the second suction member.

[0048] Optionally, a bottom edge of the spiral abuts against the ring-shaped portion.

[0049] The ring-shaped portion, the spiral, and the fork collectively enclose the second suction member.

[0050] Optionally, the outer bottom is a cylindrical structure, one end of which is closed or is tapered, and the other end is provided with a receiving opening for plugging and unplugging the middle beam core.

[0051] Optionally, the base further comprises a sleeve fixedly plugged into the receiving opening, and an outer periphery of the sleeve is provided with an annular positioning shoulder, one side of the positioning shoulder in an axial direction abuts against a top edge of the receiving opening, and the other side of the positioning shoulder in the axial direction is outside the base and serves as a connecting portion.

[0052] Optionally, the packaging tube further comprises a cover body movably plugged into the connecting portion, and the cover body and the base collectively enclose and wrap the middle beam core.

[0053] Optionally, a sidewall of the fork is provided with a slide channel extending in an axial direction, the bead is provided with a guide portion penetrating the slide channel in a radial direction, and the guide portion is matched with the threaded structure.

[0054] Optionally, both ends of the slide channel are provided with a turning positioning area, and when the bead slides to a limit position, the guide portion is respectively arranged in the positioning area at a corresponding end.

[0055] Advantages of the application

[0056] Advantages

[0057] The components of the packaging tube of the application are all made of metal materials, and the stability of cooperation movement is improved and the overall quality of the packaging tube is improved by relying on the structural strength and high machining precision of the metal itself.

[0058] Brief description of the drawings BRIEF DESCRIPTION OF DRAWINGS

[0059] Figure 1 exploded view of a packaging tube of one embodiment;

[0060] Figure 2 schematic view of a packaging tube of one embodiment;

[0061] Figure 3 exploded view of a center bundle core of one embodiment;

[0062] Figure 4 schematic view of a base of one embodiment;

[0063] Figure 5 exploded view of a base of one embodiment;

[0064] Figure 6 is a Figure 2 partial cross-sectional view of a fork of a packaging tube;

[0065] Figure 7 perspective view of a fork of one embodiment;

[0066] Figure 8 cross-sectional view of a connector block of one embodiment;

[0067] Figure 9 perspective view of a connector block of one embodiment;

[0068] Figure 10 perspective view of a retaining disk of one embodiment;

[0069] Figure 11 schematic view of a packaging tube of another embodiment;

[0070] Figure 12 exploded view of a center bundle core of one embodiment;

[0071] Figure 13 schematic view of a base of one embodiment;

[0072] Figure 14 exploded view of a base of one embodiment;

[0073] Figure 15 partial cross-sectional view of a fork of one embodiment;

[0074] Figure 16 perspective view of a fork of one embodiment;

[0075] Figure 17 perspective view of a retaining disk of one embodiment;

[0076] Figure 18 schematic view of a packaging tube of another embodiment;

[0077] Figure 19 exploded view of a center bundle core of one embodiment;

[0078] Figure 20 Structure diagram of a base of an embodiment;

[0079] Figure 21 Exploded view of a base of an embodiment;

[0080] Figure 22 For Figure 19 Enlarged view of A part in the middle;

[0081] Figure 23 Sectional view of a connecting seat of an embodiment;

[0082] Figure 24 Perspective view of a connecting seat of an embodiment.

[0083] Reference signs in the drawings are explained as follows:

[0084] 1, middle bundle core; 10, spiral; 100, thread structure;

[0085] 11, fork; 110, insertion hole; 111, insertion sleeve; 112, slide; 113, positioning area;

[0086] 12, bead; 120, guide part;

[0087] 13, connecting seat; 14, positioning part; 15, positioning groove; 16, receiving port;

[0088] 17, sleeve; 170, positioning shoulder; 171, connecting part; 172, extension part;

[0089] 2, base; 20, outer bottom; 21, inner bottom; 210, plug; 211, fixing disc;

[0090] 40, bottom opening; 41, inner flange; 42, annular part; 43, raised part;

[0091] 50, skirt; 60, first suction member; 61, second suction member; 62, flange; 611, inner folding part; 64, inner edge;

[0092] 3, cover body.

[0093] Embodiments of the application

[0094] Embodiments of the application

[0095] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0096] It is to be noted that when a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components can also be present. When a component is referred to as "being disposed on" another component, it can be directly disposed on the other component or intervening components can also be present.

[0097] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0098] In the present application, the terms "first", "second", etc. are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, order of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0099] Unless otherwise specified, the axial direction is the axial direction of the middle bundle core 1, and the horizontal direction is perpendicular to the axial direction.

[0100] Referring to Figure 2 , Figure 3 , Figure 10 , Figure 11 , Figure 18 , and Figure 19 , some embodiments provide a packaging tube, including a middle bundle core 1 and a base 2, both of which are made of metal material, the middle bundle core 1 has an axial direction in space, and the middle bundle core 1 includes a bead 12, a fork 11 and a spiral 10 from inside to outside, wherein the inner wall of the spiral 10 has a threaded structure 100, and when the spiral 10 rotates relative to the fork 11, the threaded structure 100 drives the bead 12 to slide relative to the fork 11 along the axial direction, the fork 11 and the base 2 are provided with an adaptive structure which can be relatively inserted and pulled along the axial direction, and the adaptive structure limits the relative movement of the fork 11 and the base 2 in the axial and circumferential directions.

[0101] The base 2, the bead 12, the fork 11 and the spiral 10 are all cylindrical structures. The base 2 is punched from metal (the metal material can be aluminum, aluminum alloy or the like, preferably a material that is corrosion-resistant and easy to cold work), has sufficient strength and corrosion resistance, can improve impact resistance, protect the internal structure and improve the product texture. The bead 12 is used to hold lipstick paste or medicine paste and is connected with the threaded structure 100. The spiral 10 and the fork 11 are both metal materials and are not easy to deform, improving the stability of the rotation of the spiral 10 relative to the fork 11.

[0102] The fork 11 can be pulled out or inserted in the axial direction relative to the base 2, that is, the entire middle beam core 1 can be replaced, so that the base 2 and the cover 3 can be reused.

[0103] The threaded structure 100 is a groove or a boss arranged along the inner wall of the spiral, cooperates with the bead 12 and drives the bead 12 to move axially. The threaded structure 100 can be obtained by punching or cutting. Compared with the existing packaging tube, the middle beam is omitted, which facilitates assembly. Since the spiral 10 and the bead 12 are both metal materials and are not easy to deform, the matching structure between them has high strength, and the threaded structure 100 has high machining precision compared with plastic materials, improving the stability of the sliding of the bead 12 relative to the threaded structure 100 when rotating.

[0104] The matching structure is a boss arranged on one of the fork 11 or the base 2 and a groove arranged on the other and cooperating with the boss. The fork 11 is not easy to come out of the base 2 by relying on the matching structure, avoiding unnecessary falling of the middle beam core 1, and also limiting the circumferential movement or radial deviation of the fork 11 relative to the base 2, avoiding synchronous rotation of the fork 11 when the spiral 10 rotates. Since the fork 11 and the base 2 are both metal materials and are not easy to deform, the matching structure is not easy to fail after a long time of use, causing the middle beam core 1 to be easy to fall off.

[0105] Compared with plastic materials, the metal materials used in the multiple components of the present application are more likely to obtain higher machining precision, the relative movement between the components is better in texture, and the components can be recycled, which is more environmentally friendly.

[0106] As shown in Figure 2 , Figure 11 and Figure 18 , in some embodiments, the bottom of the fork 11 is provided with a socket 110, or the bottom of the fork 11 is fixed with a connecting seat 13 with a socket 110, and the base 2 is provided with a plug 210 cooperating with the socket 110. The socket 110 and the plug 210 both adopt a non-circular cross-sectional shape at least in part to limit the circumferential movement of each other.

[0107] The socket 110 can be punched or bored from the fork 11 itself (in combination with Figure 16), the fork 11 is limited in circumferential movement relative to the base 2 by its own structure, saving parts and facilitating assembly. The socket 110 can also be carried by a separate part (the connecting seat 13), which is cylindrical and connects the fork 11 and the base 2 by the cooperation of the socket 110 and the plug 210 (combined Figure 7 、 Figure 23 and Figure 24 ). Both the connecting seat 13 and the fork 11 are metal, and no matter which assembly method is used, the cooperation strength of the socket 110 and the plug 210 is improved.

[0108] The plug 210 can be a separate part or can be stamped from the base 2. The socket 110 and the plug 210 are axially clamped and installed, and since their horizontal cross-sectional shapes are non-circular and tightly cooperate, the circumferential movement of each other is limited.

[0109] Since the fork 11 or the connecting seat 13 is a metal part, in some embodiments, the socket 110 is a through hole or a blind hole, and the above two hole structures facilitate processing.

[0110] As shown in Figure 2 、 Figure 11 and Figure 18 , in some embodiments, the inner wall of the socket 110 extends axially to form a plug-in sleeve 111 that accommodates the plug 210, increases the contact area with the outer wall of the plug 210, improves the cooperation strength of the socket 110 and the plug 210, further limits the circumferential movement of the fork 11 relative to the base 2, and also plays a role in preventing shaking. And in the axial direction, it plays a certain guiding role in the installation of the fork 11, facilitating the plug-in and plug-out operation of the middle beam core 1 relative to the base 2.

[0111] In some embodiments, the cross-sectional shape of the cooperation part of the socket 110 and the plug 210 is polygonal, limiting the circumferential movement of the fork 11 relative to the base 2 from multiple angles, and the limiting effect is good.

[0112] Considering that the fork 11 or the connecting seat 13 is a metal part, in preferred embodiments, the polygon is a regular polygon, which is easy to stamp or punch. And the number of sides of the polygon is 4-8, which limits the circumferential movement of the fork 11 relative to the base 2, and the cooperation of multiple sides improves the connection stability of the fork 11 and the base 2.

[0113] In some embodiments, the cross-sectional shape of the socket 110 is the same everywhere, and is adapted to the cross-sectional shape of the plug 210. All cross sections of the axial length of the cooperation part of the socket 110 and the plug 210 are polygonal, further limiting the circumferential movement of the fork 11 relative to the base 2.

[0114] In some embodiments, the axial length of the mating part of both the socket 110 and the plug 210 is not less than 3mm, and the sufficient mating size can improve the anti-shaking effect, keep the stable position relationship, and provide a buffer distance for disassembly.

[0115] In some embodiments, the top edge of the plug 210 is provided with a chamfer structure, which facilitates the plug-in assembly of the socket 110 and the plug 210 due to the vertical fitting of the socket 110 on the plug 210.

[0116] As shown in Figures 2-10 In some embodiments, the base 2 includes an outer bottom 20 and an inner bottom 21 in the outer bottom 20, the inner bottom 21 includes a fixed disc 211 and a columnar part protruding axially from the middle part of the fixed disc 211, and the columnar part serves as the plug 210.

[0117] The outer bottom 20 is a cylindrical metal material formed by stamping, and the inner bottom 21 is arranged in the inner recess and used to carry the inner bundle core 1. The inner bottom 21 is used to support and fixedly connect the inner bundle core 1. The fixed disc 211 is disc-shaped, but is not strictly limited to a disc and a thickness. The fixed disc 211 is fixedly connected in the outer bottom 20 and used to support the fork 11 or the connecting seat 13. The columnar part is stamped from the fixed disc 211 and forms a closed plane at the top to improve the structural strength of the plug 210.

[0118] If the fixed disc 211 is not stably connected with the outer bottom 20, the inner bundle core 1 will be loose. In some embodiments, the fixed disc 211 and the outer bottom 20 are directly or indirectly fixed to each other in at least one of the following ways:

[0119] Interference fit, the edge of the fixed disc 211 is interference-fitted with the inner wall of the outer bottom 20;

[0120] Adhesion, the bottom or edge of the fixed disc 211 is coated with glue, and after being installed in the outer bottom 20, the fixed disc 211 and the outer bottom 20 are fixedly connected with each other after the glue is cured;

[0121] Welding, since the fixed disc 211 and the outer bottom 20 are both metal materials, the fixed disc 211 and the outer bottom 20 can be fixed to each other by welding;

[0122] Clamping structure, one of the fixed disc 211 or the outer bottom 20 is provided with a buckle, and the other is provided with a clamping groove matched with the buckle, and they are fixed to each other by clamping.

[0123] Compared with the plastic material, the metal material has more connection modes, which is beneficial to design and manufacture.

[0124] In some embodiments, the plug 210 only adopts a non-circular cross-sectional shape at the part adjacent to the fixed disc 211.

[0125] Due to the long axial length of the plug 210, in order to avoid excessive friction affecting assembly, a polygonal cross-sectional shape is adopted near the fixed disc 211, and a circular cross-sectional shape is adopted away from the fixed disc 211, and the diameter of the circle is smaller than the diameter of the circumscribed circle of the polygon, facilitating the assembly of the plug 210 and the socket 110.

[0126] In some embodiments, the outer periphery of the fixed disc 211 is adjacent to the inner wall of the outer sole 20, and the fixed disc 211 and the outer sole 20 are in interference fit or clearance fit and are bonded with glue, facilitating the installation of the fixed disc 211 and leaving sufficient bonding or welding clearance. The proximity of each other brings the center of the plug close to the center of the outer sole 20, facilitating the subsequent plugging and unplugging operation of the middle beam core 1.

[0127] In some embodiments, the outer periphery of the fixed disc 211 is provided with a flange, and the outer periphery of the flange abuts against the inner wall of the outer sole 20. The flange is formed by stamping and is used for guiding the installation of the fixed disc 211, facilitating the installation. The flange and the inner wall of the outer sole 20 increase the bonding area, making the connection of the fixed disc 211 more secure.

[0128] In some embodiments, one of the fork 11 and the base 2 is provided with a radially extending positioning portion 14, and the other is provided with a positioning groove 15 receiving the positioning portion 14, and the positioning portion 14 and the positioning groove 15 limit the axial movement of each other by cooperating with each other.

[0129] The positioning portion 14 and the positioning groove 15 are stamped from the fork 11 or the base 2, and the axial cross-sectional shape of the positioning portion 14 can be polygonal or arc-shaped, and the extension distance should not be too long to avoid affecting the installation and the plugging and unplugging operation of the middle beam core 1. Under the condition of no external force, the fork 11 relies on the cooperation of the positioning portion 14 and the positioning groove 15 to avoid falling out of the base 2, and at the same time, under the condition of being pulled out by a person, the fork 11 relies on a certain deformation amount to make the positioning portion 14 separate from the positioning groove 15, so that the middle beam core 1 is pulled out and replaced.

[0130] In some embodiments, the positioning portion 14 is a plurality of positioning protrusions or annular positioning ribs arranged at intervals, and the number of protrusions is at least two, achieving multi-point positioning and making the connection of the fork 11 and the base 2 stable. Correspondingly, the positioning groove 15 is an annular groove suitable for the installation of the protrusions or the positioning ribs. It is preferred to adopt the form of protrusions, which on the one hand meets the connection and fixing requirements, and on the other hand, the local deformation amount of the fork 11 during plugging and unplugging is not too large.

[0131] As shown in Figure 9 and Figure 10 , in some embodiments, the positioning portion 14 is protruded on the outer wall of the plug 210, and the positioning groove 15 is formed in the inner wall of the socket 110.

[0132] The extending direction of the positioning part 14 is outward, which is convenient for stamping. In the embodiment, the inner wall of the socket 110 is the inner wall of the connecting seat 13. The connecting seat 13 is a thin sheet metal with a certain deformation capacity. When it is installed vertically downward, it will deform by itself to fit the positioning groove 15 on the positioning part 14. And the fork 11 and the connecting seat 13 are fixed to each other by bonding or welding, etc., realizing the connection of the fork 11 and the base 2.

[0133] As shown in the drawings, Figures 11-17 In another embodiment, the base 2 includes an outer bottom 20 and an inner bottom 21 located in the outer bottom 20. The inner bottom 21 includes a fixed disc 211 and a columnar part protruding axially from the middle part of the fixed disc 211, and the columnar part serves as a plug 210. The edge part of the fixed disc 211 extends axially to form a skirt 50 wrapped around the outer periphery of the fork 11. The positioning part 14 is located inside the skirt 50, and the positioning groove 15 is provided on the outer wall of the fork 11.

[0134] As shown in the drawings, Figures 13-17 The skirt 50 is formed by stamping and can be arranged in multiple intervals or continuously. The positioning part 14 is in the form of a protruding point and is arranged in intervals on the inner wall of the skirt 50. Correspondingly, the positioning groove 15 is in the form of a ring arranged on the fork 11. The fixed disc 211 is fixed to the outer bottom 20 by gluing, and the fork 11 is fixed to the base 2 by the cooperation of the positioning part 14 and the positioning groove 15.

[0135] As shown in the drawings, Figure 17 In a preferred embodiment, the skirt 50 includes multiple unit pieces arranged in intervals in the circumferential direction. The positioning part 14 is distributed on at least two unit pieces, and the unit pieces are arranged in intervals in the circumferential direction. The unit pieces are arranged in intervals in the circumferential direction, and at least three unit pieces are arranged in uniform intervals, realizing triangular positioning and reliable guiding of the fork 11. The non-continuous arrangement of the unit pieces makes the fixed disc 211 have a good deformation capacity, which is convenient for the insertion and installation of the fork 11. The positioning part 14 is distributed on at least two unit pieces, which improves the stability of the connection between the fork 11 and the base 2.

[0136] As shown in the drawings, Figure 2 , Figures 6-9 In some embodiments, the fork 11 is provided with a bottom opening 40, and the bottom opening 40 is provided with an inward flange 41. The connecting seat 13 includes an annular part 42 overlapping the inward flange 41, and a plug sleeve 111 extending axially from the inner edge of the annular part 42 into the bottom opening 40. The inside of the plug sleeve 111 is the socket 110.

[0137] The bottom opening 40 is formed by the outer periphery of the inward flange 41, which is stamped and perpendicular to the axial direction. The annular portion 42 supports the fork 11 against the inward flange 41, and the inward flange 41 is glued or welded to the annular portion 42 so that the connecting seat 13 and the fork 11 are fixedly connected to each other. The insertion sleeve 111 is stamped and abuts against the outer periphery of the inward flange 41 near the outer periphery of the annular portion 42 to limit the circumferential movement of the fork 11.

[0138] As shown in Figure 2 , Figures 6-9 , in some embodiments, the annular portion 42 has an axial undulating structure, and the base 2 and the fork 11 are abutted and pre-tightened by the undulating structure. The undulating structure is a convex point extending from the surface of the annular portion 42 in the axial direction for abutting against the fork 11. The convex point can be a continuous ring or can be arranged at intervals. The convex point abuts against the fork 11, and the other parts (except the convex point) of the annular portion 42 abut against the base 2.

[0139] As shown in Figure 9 , in a preferred embodiment, the undulating structure is formed by a plurality of raised portions 43 arranged at intervals. In the axial direction, the raised direction of each raised portion 43 is the same and faces the fork 11.

[0140] The raised portions 43 are at least three for abutting against the fork 11. The raised height of each raised portion 43 is the same to ensure the horizontality of the fork 11.

[0141] In some embodiments, the plurality of raised portions 43 are uniformly distributed in the axial direction and are adjacent to the insertion sleeve 111 in the radial direction. If the raised portions 43 are arranged in a semicircular region, it is easy to cause unstable support of the fork 11. Therefore, uniform arrangement of the raised portions 43 makes the support of the fork 11 more stable. The adjacent arrangement to the insertion sleeve 111 facilitates stamping.

[0142] As shown in Figure 18 , in another embodiment, the fork 11 and the base 2 are limited in axial movement by magnetic attraction.

[0143] A magnet is arranged in one of the fork 11 or the base 2, and the other one is itself magnetic (for example, adding magnetic powder or being made of a metal with magnetism). Without external force, the middle beam core 1 relies on magnetic attraction to avoid being pulled out of the base 2. When it is necessary to replace the middle beam core 1, the middle beam core 1 can be manually pulled out.

[0144] As shown in Figure 18As shown, in some embodiments, the base 2 includes an outer bottom 20 and an inner bottom 21 located within the outer bottom 20. The inner bottom 21 includes a fixing plate 211 and a columnar portion protruding axially from the center of the fixing plate 211, and the columnar portion serves as a plug 210. A first suction member 60 is clamped and fixed between the outer bottom 20 and the inner bottom 21, and a second suction member 61 that is magnetically attracted to the first suction member 60 is fixed on the fork 11.

[0145] The first magnetic attraction component 60 is a cylindrical magnet, which is fixed between the outer bottom 20 and the inner bottom 21 by adhesive or other means. The second magnetic attraction component 61 is magnetic (it can be a magnet or the material itself is magnetic), and it is located at the bottom of the fork 11 to facilitate mutual attraction with the first magnetic attraction component 60. The second magnetic attraction component 61 can be stamped from the fork 11 or glued or connected to the bottom of the fork 11 as a separate component. In this case, the fork 11 can be made of a non-magnetic metal material, such as aluminum.

[0146] like Figures 20-22 As shown, in some embodiments, the outer periphery of the fixing plate 211 has a flange 62 facing away from the fork 11, and the first suction member 60 is surrounded in the flange 62. The first suction member 60 is cylindrical and has a clearance fit with the inner wall of the outer bottom 20. The flange 62 is stamped and inserted into the gap between the outer bottom 20 and the first suction member 60 to hold the first suction member 60. The outer bottom 20, the first suction member 60 and the fixing plate 211 are fixedly connected by adhesive.

[0147] In some embodiments, the second suction member 61 is annular and surrounds and is fixed to the outer periphery of the fork 11. The annular structure surrounds the outer periphery of the fork 11, which better fixes it to the fork 11. The annular structure makes the second suction member 61 and the first suction member 60 more tightly attracted to each other, effectively preventing the fork 11 from accidentally coming off.

[0148] like Figures 18-24 As shown, in some embodiments, the fork 11 has a bottom opening 40, and the bottom opening 40 has an inward flange 41. The connecting seat 13 includes an annular portion 42 overlapping the inward flange 41, and a plug sleeve 111 extending axially from the inner edge of the annular portion 42 into the bottom opening 40. The interior of the plug sleeve 111 is a plug hole 110. The bottom of the second suction member 61 is provided with an inward fold 611, which is fixedly clamped between the inward flange 41 and the annular portion 42.

[0149] The inner edge 64 of the inner flange 41 is rolled over and wrapped around the top edge of the insertion sleeve 111. The inner edge 64 is stamped after the second suction member 61 and the fork 11 are installed. The inner edge 64 and the annular portion 42 clamp and fix the second suction member 61 and the fork 11, limiting the axial movement of the second suction member 61 and the fork 11, and relatively fixing the connection seat 13, the second suction member 61 and the fork 11 as a whole, eliminating the gluing operation.

[0150] As shown in Figures 22-24 some embodiments, the top edge of the insertion sleeve 111 is rolled over and wrapped around the inner edge 64 of the inner flange 41. The inner edge 64 is stamped after the second suction member 61 and the fork 11 are installed. The inner edge 64 and the annular portion 42 clamp and fix the second suction member 61 and the fork 11, limiting the axial movement of the second suction member 61 and the fork 11, and relatively fixing the connection seat 13, the second suction member 61 and the fork 11 as a whole, eliminating the gluing operation.

[0151] As shown in Figure 18 and Figure 22 some embodiments, the bottom of the spiral 10 blocks the outer periphery of the second suction member 61, so that when the middle beam core 1 is pulled out, the second suction member 61 is hidden and not easily noticed, making the product more simple.

[0152] As shown in Figure 18 and Figure 22 some embodiments, the bottom edge of the spiral 10 abuts against the annular portion 42. The annular portion 42, the spiral 10 and the fork 11 enclose the second suction member 61, shielding the second suction member 61 from various angles, making the appearance of the middle beam core 1 more simple, and preventing the second suction member 61 from coming out.

[0153] As shown in Figure 5 , Figure 14 and Figure 21 some embodiments, the outer bottom 20 is a cylindrical structure, one end is closed or closed, the other end has a receiving port 16 for inserting and pulling out the middle beam core 1, and the closed or closed end is away from the middle beam core 1, protecting the internal structure (dust and dirt prevention). The inner wall of the receiving port 16 is adapted to the outer wall of the middle beam core 1, limiting the circumferential movement of the middle beam core 1.

[0154] As shown in Figure 2 , Figure 4 , Figure 11 ,Figure 13 , Figure 18 and Figure 20 As shown, in some embodiments, the base 2 further includes a sleeve 17 that is fixedly inserted into the receiving port 16. The outer periphery of the sleeve 17 has an annular positioning shoulder 170. One axial side of the positioning shoulder 170 abuts against the top edge of the receiving port 16, and the other axial side of the positioning shoulder is outside the base and serves as a connecting part 171.

[0155] The sleeve 17 is cylindrical and formed by stamping. It is used to reduce the assembly gap between the base 2 and the middle core 1, resulting in a simpler appearance. The positioning shoulder 170 is located inside the base 2 as an extension 172 on the side near the receiving port 16. The extension 172 is cylindrical and located between the middle core 1 and the receiving port 16, and is fixed to the receiving port 16 by adhesive. The positioning shoulder 170 protrudes outward and abuts against the top edge of the receiving port 16, covering the assembly gap. The connecting part 171 is cylindrical and close to the outer wall of the middle core 1, thereby reducing the assembly gap between the base 2 and the middle core 1.

[0156] like Figure 1 As shown, in some embodiments, the packaging tube further includes a cover 3 that is movably inserted into the connecting portion 171. The cover 3 and the base 2 together enclose the central core 1. The cover 3 is cylindrical, and its inner wall fits against the outer wall of the connecting portion 171, providing a certain guiding function and facilitating fastening. The top of the cover 3 is closed or tapered, working in conjunction with the base 2 to enclose and shield the central core 1 for dust and dirt prevention. Furthermore, the cover 3 and the base 2 are made of metal, possessing sufficient strength and improved impact resistance. Compared to plastic materials, the connection point with the sleeve 17 is less prone to cracking, resulting in a longer service life.

[0157] The specific fit between the fork 11 and the bead 12 can be achieved using existing technology, and is not the focus of improvement. For example... Figure 2 , Figure 3 , Figure 11 , Figure 12 , Figure 18 and Figure 19 As shown, in some embodiments, the sidewall of the fork 11 has an axially extending slide 112, the bead 12 has a guide portion 120 extending radially out of the slide 112, and the guide portion 120 cooperates with the threaded structure 100.

[0158] The slide 112 is axially formed on the side wall of the fork 11, and the guide part 120 protrudes radially outward through the slide 112, so that the two sides of the slide 112 limit the rotation of the bead 12, and the bead 12 can only slide axially along the slide 112. When the screw 10 rotates relative to the fork 11, the threaded structure 100 cooperates with the slide 112 to drive the bead 12 to slide axially. The threaded structure 100 is generally a spiral groove, which can be one or multiple parallel grooves. Preferably, the threaded structure is at least two grooves, and the grooves are uniformly arranged, and the positions of the slide 112 and the guide part 120 relative to the threaded structure are arranged so that the bead 12 is simultaneously driven to slide at multiple angles, so that the expansion and contraction of the cream is more stable and smooth. The screw 10, the fork 11 and the bead 12 are all metal materials, so that the cooperation between the guide part 120 and the threaded structure 100 has high stability and long service life, and the expansion and contraction of the cream is abnormal.

[0159] As shown in Figure 2 、 Figure 3 、 Figure 11 、 Figure 12 、 Figure 18 and Figure 19 , in some embodiments, the two ends of the slide 112 have turning positioning areas 113, and when the bead 12 slides to the limit position, the guide part 120 is respectively located in the positioning area 113 at the corresponding end. The positioning area 113 is arranged on the outer wall of the fork 11 and at the upper and lower ends of the slide 112, and extends along the circumferential direction of the fork 11, so that the bead 12 can be stopped at the highest and lowest positions.

[0160] The packaging tube of the present application is all made of metal material, which improves the stability of cooperation by relying on the unique structural strength of the metal itself, for example, the cover 3 and the base 2 are not prone to cracking after being frequently buckled for a long time. The number of expansion and contraction of the bead 12 is increased compared to the plastic material, and the overall quality of the packaging tube is improved.

[0161] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope disclosed in the present application. When the technical features in different embodiments are embodied in the same figure, it can be considered that the figure also discloses the combination of each embodiment involved.

[0162] The above-mentioned embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A packaging tube comprising a central core and a base, characterized in that The middle beam core and the base are made of metal material, the middle beam core has axial space, the middle beam core comprises beads, forks and spirals from inside to outside, the inner wall of the spiral is provided with a threaded structure, when the spiral rotates relative to the fork, the threaded structure drives the beads to slide relative to the fork along the axial direction, the fork and the base are provided with an adaptive structure which can be inserted and pulled relative to each other along the axial direction, and the adaptive structure limits the relative movement of the fork and the base in the axial and circumferential directions; The bottom of the fork is provided with a socket, and the base is provided with a plug which cooperates with the socket; The socket and the plug are both at least partially provided with a non-circular cross-sectional shape to limit the circumferential movement of each other; Among the fork and the base, the base is provided with a radial extending positioning part, and the fork is provided with a positioning groove which receives the positioning part, and the positioning part and the positioning groove limit the axial movement of each other by mutual cooperation; The positioning part is a plurality of positioning convex points or annular positioning ribs which are arranged at intervals; The positioning part is protruded on the outer wall of the plug, and the positioning groove is opened on the inner wall of the socket; The base comprises an outer bottom and an inner bottom which is located in the outer bottom, the inner bottom comprises a fixed disc and a columnar part which is protruded from the middle part of the fixed disc along the axial direction, and the columnar part serves as the plug; The edge part of the fixed disc extends along the axial direction to form a skirt which wraps the outer circumference of the fork, the positioning part is located inside the skirt, and the positioning groove is opened on the outer wall of the fork; The skirt comprises a plurality of unit pieces which are arranged at intervals along the circumferential direction, and at least two unit pieces are distributed with the positioning part.

2. The packaging tube of claim 1, wherein The socket is a through hole or a blind hole.

3. The packaging tube of claim 2, wherein, The inner wall of the socket extends along the axial direction to form a plug-in sleeve which accommodates the plug.

4. The packaging tube of claim 1, wherein The cross-sectional shape of the cooperation part of the socket and the plug is a polygon.

5. The packaging tube of claim 4, wherein, The polygon is a regular polygon, and the number of sides is 4-8.

6. The packaging tube of claim 1, wherein The cross-sectional shape of the socket is the same everywhere, and is adapted to the cross-sectional shape of the plug.

7. The packaging tube of claim 1, wherein The axial length of the cooperation part of the socket and the plug is not less than 3mm.

8. The packaging tube of claim 1, wherein The top edge of the plug is provided with a chamfer structure.

9. The packaging tube of claim 1, wherein The outer bottom is a cylindrical structure, one end is closed or closed, and the other end is provided with a receiving port for inserting and pulling the middle beam core.

10. The packaging tube of claim 9, wherein, The base further comprises a sleeve which is fixedly plugged into the receiving port, the outer circumference of the sleeve is provided with an annular positioning shoulder, one side of the positioning shoulder along the axial direction abuts against the top edge of the receiving port, and the other side of the positioning shoulder along the axial direction is located outside the base and serves as a connecting part.

11. The packaging tube of claim 10, wherein The packaging tube further comprises a cover which is movably plugged into the connecting part, and the cover and the base wrap the middle beam core.

12. The packaging tube of claim 1, wherein The side wall of the fork is provided with a slide which extends along the axial direction, the beads are provided with a guide part which penetrates the slide along the radial direction, and the guide part cooperates with the threaded structure.

13. The packaging tube of claim 12, wherein, Both ends of the slide are provided with a turning positioning area, when the beads slide to the limit position, the guide part is located in the positioning area of the corresponding end.

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