Paper clamping plug for paper tube and clamping plug assembly

Abstract

The utility model relates to the technical field of paper tube reinforcing and assembling, in particular to a paper clamping plug for a paper tube and a clamping plug assembly, the paper clamping plug comprises an integrally-formed cylindrical paper plug body, the paper plug body comprises a connecting part inserted into the paper tube and a clamping part used for being connected with the outside in a clamping mode, and the connecting part is provided with a first through hole capable of allowing a rotating shaft to penetrate through; the connecting part is coaxially connected with the clamping part, an abutting table abutting against the cutting face of the paper tube is arranged at the end, close to the connecting part, of the clamping part, the outer diameter of the abutting table is larger than the inner diameter of the paper tube, the abutting table extends away from the paper tube along the outer wall of the clamping part and is provided with at least two first protrusions, and the face, close to the paper tube, of each first protrusion is provided with a first abutting area. The first abutting area extends out of an abutting table in the radial direction, and when the connecting part is inserted into the paper tube, the abutting table and the first abutting area abut against the cutting face of the paper tube. The environment-friendly strength of paper product packaging and transporting can be improved, the paper tube can be prevented from slipping and deforming in the transporting process, and the reliability and accuracy of paper tube assembling are improved.

Description

Technical Field

[0001] This application relates to the field of paper tube reinforcement and assembly technology, and in particular to a paper plug and plug assembly for paper tubes. Background Technology

[0002] Paper products are widely used in modern packaging and transportation, especially now that environmental awareness is deeply ingrained. Paper materials, due to their recyclability and biodegradability, are gradually replacing traditional plastic products. In particular, paper tubes are widely used as an important support structure in packaging materials such as air cushion paper and honeycomb paper. To meet the needs of automated production equipment, paper tubes typically require an installation structure for mounting and positioning; this structure is usually called a clamp. With the development and application of various clamp products, these products have not only improved production efficiency but also enhanced the stability of paper tubes. To address the need for fixing paper tubes, the industry has widely adopted various design solutions to achieve the installation and positioning functions of paper tubes. For example, one existing solution is to install end caps at both ends of the paper tube, with through holes in the middle for a pivot shaft to pass through, allowing for simple fixation. However, these simple end caps are not strong enough and can easily deform the paper tube, and slippage between the paper tube and the end cap is also common. Therefore, to prevent slippage and deformation during transportation, another type of insert has emerged on the market. A plastic insert is embedded at one end of the paper tube. Because the plastic surface is relatively smooth and prone to slippage, multiple elastic protrusions are glued to the outer wall of the insert, and the entire insert is inserted into the paper tube, relying on the friction between the protrusions and the inner wall of the paper tube to achieve a stable connection. However, while these methods can solve the problem to some extent, there are still issues in their practical implementation.

[0003] In actual use, the protrusions bonded to the outer wall of the card plug are prone to falling off after long-term compression, making it difficult to fix the paper tube properly to the card plug. Furthermore, due to some deviations in the inner diameter of the paper tube during the production process, when the inner diameter of the paper tube is too large, the elastic protrusion of the card plug can easily be inserted into the paper tube, resulting in insufficient interaction force between the elastic protrusion and the inner wall of the paper tube, leading to poor fixing effect between the card plug and the paper tube and easy slippage. When the inner diameter of the paper tube is too small, the elastic protrusion of the card plug is difficult to insert into the paper tube, requiring a large amount of squeezing force to insert the card plug into the paper tube. These problems seriously affect the reliability and accuracy of paper tube assembly. Utility Model Content

[0004] In order to improve the environmental protection of paper product packaging and transportation, prevent paper tubes from slipping and deforming during transportation, and enhance the reliability and accuracy of paper tube assembly, this application provides a paper plug and plug assembly for paper tubes.

[0005] Firstly, this application provides a paper stopper for paper tubes, comprising an integrally formed cylindrical paper stopper body. The paper stopper body includes a connecting portion that inserts into the paper tube and a snap-fit ​​portion for engaging with the outside. The connecting portion is provided with a first through hole through which a rotating shaft can pass. The connecting portion and the snap-fit ​​portion are coaxially connected. Near the connecting portion, the snap-fit ​​portion has an abutment platform that abuts against a cut surface of the paper tube. The outer diameter of the abutment platform is larger than the inner diameter of the paper tube. At least two first protrusions extend along the outer wall of the snap-fit ​​portion away from the paper tube from the abutment platform. Each first protrusion has a first abutment area near the paper tube. The abutment platform extends radially from the first abutment area. When the connecting portion is inserted into the paper tube, the abutment platform and the first abutment area abut against the cut surface of the paper tube. By adopting the above technical solution, the integrally formed design of the cylindrical paper stopper body is more environmentally friendly and also ensures the stability and reliability of the structure. After the connecting part is inserted into the paper tube, the design of the outer diameter of the abutment platform being larger than the inner diameter of the paper tube effectively prevents the locking part from entering the paper tube, providing a radial clamping force to the paper tube and thus improving the stability of the paper tube's fixation. Furthermore, the first abutment area on the first protrusion further enhances the contact area with the cut surface of the paper tube, allowing the paper tube to disperse pressure through the combined action of the first abutment area and the abutment platform when subjected to external forces, preventing deformation or loosening of the paper tube. This design not only solves the problem of poor fixation caused by the easy detachment of elastic protrusions in traditional plugs, but also ensures good fixation for paper tubes of different sizes through its adaptable design to deviations in the inner diameter of the paper tube. Preferably, the outer wall of the connecting part is provided with two second protrusions, and a first groove is provided between the two second protrusions. When the connecting part is inserted into the paper tube, the second protrusions abut against the inner wall of the connecting part, and the first groove forms an venting gap with the inner wall of the connecting part. By adopting the above technical solution, the two second protrusions on the outer wall of the connecting part can make close contact with the inner wall of the paper tube when inserted into the paper tube, thereby forming an effective frictional force and enhancing the connection stability between the paper plug and the paper tube. Simultaneously, the first groove between the two second protrusions can form an exhaust gap with the inner wall of the paper tube. During the insertion of the paper plug into the paper tube, air inside the paper tube can be discharged through this exhaust gap, facilitating the removal of the connecting part from the paper tube and avoiding the problem of increased insertion resistance due to air compression. Furthermore, this design can effectively reduce the risk of deformation caused by excessive air tightness when the paper plug is inserted into the paper tube, thereby improving the reliability and accuracy of assembly. Preferably, the diameter of the connecting part gradually increases from the end away from the locking part to the end closer to the locking part, and the diameter of the locking part gradually increases from the end closer to the connecting part to the end away from the connecting part.By adopting the above technical solution, the diameter of the connecting part gradually increases from the end away from the locking part to the end near the locking part, making it easier for the connecting part to be inserted into the paper tube and better adapting to changes in the inner diameter of the paper tube. This reduces insertion difficulties caused by a small inner diameter of the paper tube, while also enhancing the friction between the connecting part and the inner wall of the paper tube, improving the fixing effect. The gradual increase in diameter of the locking part from the end near the connecting part to the end away from the connecting part helps the locking part form a more stable support structure at the end of the paper tube, preventing deformation or slippage of the paper tube during transportation or use, thereby improving the reliability and accuracy of the paper tube assembly. Preferably, the inner wall of the locking part is provided with a second groove corresponding to the first protrusion on the outer wall of the locking part. By adopting the above technical solution, the second groove on the inner wall of the locking part corresponds to the position of the first protrusion on the outer wall of the locking part. This design can effectively reduce material usage, and during the paper plug manufacturing process, by optimizing the structural layout, the first protrusion is subjected to more uniform force during molding, thereby improving the overall structural stability. Preferably, each of the first protrusions is a trapezoidal body, and the width of the first protrusion away from the paper tube end is greater than the width of the first protrusion near the paper tube end. By adopting the above technical solution, the first protrusion is designed as a trapezoidal body, and the width away from the paper tube end is greater than the width near the paper tube end. This structure allows the locking part to provide greater radial support force after the connecting part is inserted into the paper tube, ensuring a stable connection between the paper plug and the paper tube. Preferably, the abutment platform is an arc-shaped transition surface. By adopting the above technical solution, the arc-shaped transition surface can guide the paper tube cutting surface to fit more smoothly against the abutment platform and the first abutment area when the paper plug contacts the paper tube cutting surface, avoiding stress concentration or damage that may be caused by sharp edges. At the same time, the arc-shaped transition surface can also improve the sealing performance between the paper plug and the paper tube, reduce loosening or shaking caused by shape mismatch, thereby ensuring the stability and reliability of the paper plug in the paper tube. This design not only improves assembly efficiency but also enhances the durability of the overall structure. Preferably, the end of the locking part away from the paper tube is folded outward to form a first reinforcing ring. By adopting the above technical solution, the end of the locking part away from the paper tube is folded outward to form a first reinforcing ring. This design significantly improves the overall structural strength of the paper plug. Specifically, the reinforcing ring formed by the folding can effectively disperse the external pressure on the paper plug during use, avoiding deformation or damage caused by excessive local stress. At the same time, the presence of the first reinforcing ring can also enhance the contact stability between the locking part and the external structure, preventing loosening during assembly or transportation. In addition, since the first reinforcing ring increases the thickness and rigidity of the edge of the locking part, it further improves the reliability of the paper plug when connected to the paper tube or other components, ensuring the stability and durability of the entire structure under various working conditions. Preferably, the number of the first protrusions is six, and the six first protrusions are evenly distributed on the outer wall of the locking part.By adopting the above technical solution, six first protrusions are provided on the outer wall of the locking part, and the evenly distributed design ensures that the force is more uniform when the paper tube cut surface contacts the abutment platform and the first abutment area. This uniform distribution not only improves the stability of the paper plug at the end of the paper tube, but also effectively avoids tilting or displacement problems caused by uneven force. At the same time, the number of six first protrusions meets the structural strength requirements while taking into account the ease of processing and reducing material waste. In the actual assembly process, the evenly distributed first protrusions can better adapt to some deviations in the inner diameter of the paper tube, ensuring a tighter and more reliable fit between the paper plug and the paper tube, thereby significantly improving the paper tube fixing effect and assembly accuracy. Secondly, a cardholder assembly includes the paper cardholder and a cylindrical reinforcing plug for inserting the paper cardholder. The reinforcing plug has a second through hole coaxially arranged on its side near the paper tube, communicating with the first through hole. The outer wall of the reinforcing plug has a third protrusion corresponding to the second groove. The end of the reinforcing plug away from the paper tube is folded outward to form a second reinforcing ring. When the third protrusion of the reinforcing plug is inserted into the paper cardholder along the second groove, the second reinforcing ring abuts against the first reinforcing ring. By adopting the above technical solution, the cooperative design of the paper cardholder and the reinforcing plug significantly improves the stability and reliability of the paper tube assembly. Specifically, the outer wall of the cardholder's locking portion has a first protrusion, forming a double abutment with the cut surface of the paper tube, ensuring the paper cardholder is firmly fixed at the end of the paper tube. When the reinforcing plug is inserted into the paper card stopper, its third protrusion precisely engages with the second groove of the paper card stopper. This not only enhances the overall structural connection strength but also further restricts axial displacement through the contact between the second and first reinforcing rings, further strengthening the overall structural connection strength and avoiding slippage or loosening problems caused by the failure of the elastic protrusion in traditional stoppers. Furthermore, the second through-hole of the reinforcing plug communicates with the first through-hole of the paper card stopper, facilitating the installation of the rotating shaft. Simultaneously, the cylindrical structure of the reinforcing plug effectively compensates for any potential strength deficiencies in the paper card stopper, significantly improving the pressure-bearing capacity and service life of the entire stopper assembly. This design ensures assembly accuracy while significantly improving the stability of the paper tube during transportation and use. Preferably, each of the third protrusions extends with a protrusion at one end near the paper tube, and a locking cavity is formed within the reinforcing plug corresponding to the position of the protrusion to accommodate the external locking part. The vertical height of the third protrusion is less than or equal to the vertical height of the second groove. By adopting the above technical solution, a protrusion is extended from the end of the third protrusion near the paper tube. This design allows the third protrusion to provide an additional limiting function when inserted into the second groove of the paper card plug. At the same time, a locking cavity is formed inside the reinforcing plug corresponding to the protrusion position. This structural design not only ensures that the locking cavity can accommodate the external locking part, but also enhances the overall stability of the card plug assembly through the cooperation between the protrusion and the locking cavity.Furthermore, setting the vertical height of the third protrusion to be less than or equal to the vertical height of the second groove effectively avoids jamming caused by the height difference during insertion, thus ensuring smooth assembly. This design reasonably balances assembly accuracy and structural strength, significantly improving the reliability and practicality of the plug assembly.

[0006] In summary, this application includes at least one of the following beneficial technical effects:

[0007] 1. By setting an abutment platform and a first protrusion at the snap-fit ​​part, and the first abutment area of ​​the first protrusion extending radially to form the abutment platform, the contact area and friction with the paper tube cutting surface can be effectively increased, significantly improving the fixing effect between the snap-fit ​​and the paper tube and preventing slippage;

[0008] 2. The outer wall of the connecting part is provided with a second protrusion and a first groove to form an exhaust gap. When inserting the paper tube, it can effectively reduce air resistance and expel internal air, ensuring that the plug can be smoothly inserted into paper tubes with different inner diameters, thereby improving assembly efficiency and reliability.

[0009] 3. The gradually changing diameter design of the connecting part and the snap-fit ​​part allows the snap-fit ​​to automatically adapt to the change in the inner diameter of the paper tube when it is inserted. It can provide sufficient support when the inner diameter is too large, and reduce the difficulty of insertion when the inner diameter is too small, thereby comprehensively improving the stability and accuracy of paper tube assembly. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of a paper stopper for a paper tube in Embodiment 1;

[0011] Figure 2 This is a front view of a paper stopper for a paper tube according to Embodiment 1;

[0012] Figure 3 This is a schematic diagram of the reinforcing plug of a plug assembly according to Embodiment 2;

[0013] Figure 4 This is a schematic diagram of the structure of a plug assembly in Embodiment 2.

[0014] Explanation of reference numerals in the attached drawings: a, paper plug body; b, reinforcing plug; a1, connecting part; a2, snap-fit ​​part; a11, first through hole; a12, second protrusion; a13, first groove; a21, abutting platform; a22, first protrusion; a23, second groove; a24, first reinforcing ring; a221, abutting area; b1, second through hole; b2, third protrusion; b3, second reinforcing ring; b4, protrusion; b41, locking cavity. Detailed Implementation

[0015] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0016] Example 1

[0017] This application provides a paper stopper for paper tubes, as shown in the embodiments below. Figure 1 and Figure 2 The paper plug body a includes a paper plug body a, which includes a connecting part a11 and a snap-fit ​​part a22 arranged coaxially. The connecting part a1 is provided with a first through hole a11 through which a rotating shaft can be installed. The paper plug body a is made of rigid paper material, for example, it can be formed into an integral cylindrical structure by a bamboo pulp wet pressing mold. When the paper snap-fit ​​is used for paper tube installation and positioning, the connecting part a1 can be inserted into the paper tube, while the snap-fit ​​part a2 is exposed outside the paper tube for snap-fit ​​with the outside.

[0018] Specifically, the outer wall of the connecting part a1 is provided with at least two second protrusions a12, and a first groove a13 is provided between the two second protrusions a12, so that the outer wall of the connecting part a1 forms a circumferentially distributed concave-convex wall surface design. The number of second protrusions a12 can be two, three, four, etc., and in this embodiment, four are preferred, which helps to enhance the fastening strength between the connecting part a1 and the paper tube. The diameter of the connecting part a1 gradually increases from the end away from the snap-fit ​​part a2 to the end closer to the snap-fit ​​part a2, forming a frustum-shaped structure. When the connecting part a1 is inserted into the paper tube, the second protrusions a12 abut against the inner wall of the connecting part a1, and the first groove a13 forms an exhaust gap with the inner wall of the connecting part a1. When the connecting part a1 is forcefully inserted into the paper tube, the first groove a13 helps to expel air from the paper tube, facilitating the installation of the connecting part a1. At the same time, when pressure is applied to pull the connecting part a1 out of the paper tube, the presence of the first groove a13 can maintain the balance between the pressure inside the paper tube and the external pressure, facilitating the removal of the connecting part a1. In addition, the frustum-shaped connecting part a1 makes it easy to align the paper plug connecting part a1 with the paper tube. As the paper plug is forcefully inserted into the paper tube, the connecting part a1 and the inner wall of the paper tube are interference-fitted. Relying on the friction between the second protrusion a12 and the inner wall of the paper tube, the connecting part a1 and the paper tube are firmly fixed together. In this embodiment, the second protrusion a12 is an arc-shaped transition surface. In other embodiments, the contour of the second protrusion a12 can be adjusted according to the shape of the inner wall of the paper tube, as long as the high degree of fit between the second protrusion a12 and the inner wall of the paper tube can be guaranteed.

[0019] Furthermore, an abutment platform a21 with an arc-shaped transition surface is provided at the connection between the latching part a2 and the connecting part a1. The radius of curvature of the arc-shaped transition surface is adjusted according to the inner diameter of the paper tube. The outer diameter of the abutment platform a21 is larger than the inner diameter of the paper tube. The abutment platform a21 abuts against the paper tube cutting surface to prevent the latching part a2 from being inserted into the paper tube. At least two first protrusions a22 are provided on the abutment platform a21 extending away from the paper tube along the outer wall of the latching part a2. Each first protrusion a22 has an abutment area a221 on the side near the paper tube. The abutment area a221 extends radially out of the abutment platform a21. When the connecting part a1 is inserted into the paper tube, both the abutment platform a21 and the abutment area a221 abut against the paper tube cutting surface, thereby improving the reliability and accuracy of the paper tube assembly. The number of first protrusions a22 can be two, three, four, etc. When there are two first protrusions a22, they are relatively disposed on the outer wall of the latching part a2. When there are three first protrusions a22, they are evenly disposed on the outer wall of the latching part a2. In this embodiment, six first protrusions a22 are preferred. Correspondingly, the six first protrusions a22 are evenly spaced on the outer wall of the latching part a2 to enhance the stability of the latching part a2. It is worth mentioning that the diameter of the latching part a2 gradually increases from the end near the connecting part a1 to the end away from the connecting part a1. The latching part a2 is also designed as a frustum, and each first protrusion a22 is a trapezoid. The width of the first protrusion a22 away from the paper tube end is greater than the width of the protrusion near the paper tube end. This structural design further improves the reliability of the paper plug when connected to the paper tube or other components, and ensures the stability and durability of the entire structure under various working conditions.

[0020] Specifically, a second groove a23 is provided on the inner wall of the latching part a2 corresponding to the first protrusion a22 on the outer wall of the latching part a2. The shape of the second groove a23 can be a rectangular groove or a trapezoidal groove, specifically designed to match the shape of the protrusion. This design can reduce the overall weight of the latching part a2. Further, the end of the latching part a2 away from the paper tube is folded outward to form a first reinforcing ring a24. The folding angle of the first reinforcing ring a24 can be from 45 degrees to 90 degrees. In this embodiment, 90 degrees is preferred for higher strength. The folding length is adjusted according to actual needs. This design can increase the strength of the latching part a2 and prevent deformation of the latching part a2 due to external forces. The implementation principle of this embodiment is as follows: the paper plug is made of rigid paper material and integrally formed into a cylindrical structure, including a connecting part a1 and a latching part a2 arranged coaxially. First, the connecting part a1 has a through hole for the mounting shaft to pass through and is designed as a frustum-shaped structure. Its outer wall has at least two second protrusions a12 and a first groove a13 to facilitate venting during installation and maintaining pressure balance during removal. Second, the snap-fit ​​part a2 is designed as another frustum-shaped structure. Between the connecting part a1 and the snap-fit ​​part a2, there is an arc-shaped transition surface abutment platform a21. The abutment platform a21 and its at least two extended protrusions enhance the contact with the paper tube cut surface, improving assembly reliability and accuracy. In addition, the outer wall of the snap-fit ​​part a2 has six trapezoidal first protrusions a22 evenly distributed to enhance stability, and the inner wall has corresponding second grooves a23 to reduce weight. Finally, the end of the snap-fit ​​part a2 away from the paper tube is folded outward to form a first reinforcing ring a24 to increase strength and prevent deformation. The entire design process, from the convenient installation of the connecting part a1 to the stable connection of the snap-fit ​​part a2, and then to the enhanced design of the reinforcing ring, prevents the paper tube from slipping and deforming during transportation, ensuring the reliability, stability and durability of the connection between the paper plug and the paper tube.

[0021] Example 2

[0022] This embodiment provides a cartridge assembly, referring to... Figure 3 and Figure 4 The device includes a reinforcing plug b and a paper card plug of embodiment 1. The reinforcing plug b is a cylindrical structure into which the paper card plug can be inserted. The reinforcing plug b is provided with a second through hole b1 corresponding to the first through hole a11 of the paper card plug. An external mounting shaft passes through the second through hole b1 and the first through hole a11. The paper card plug and the reinforcing plug b cooperate to abut against each other.

[0023] Specifically, the outer wall of the reinforcing plug b has a third protrusion b2, which corresponds to the second groove a23 on the inner wall of the latching part a2, forming a corresponding concave-convex design between the inner and outer walls of the latching part a2. Furthermore, the end face of the reinforcing plug b away from the paper tube is folded outward to form a second reinforcing ring b3, which corresponds to the first reinforcing ring a24. When the third protrusion b2 of the reinforcing plug b is inserted into the paper card plug along the second groove a23, the second reinforcing ring b3 abuts against the first reinforcing ring a24. Correspondingly, the folding angle of the second reinforcing ring b3 is equal to the folding angle of the first reinforcing ring a24. In this embodiment, the folding angle of the second reinforcing ring b3 is preferably 90 degrees, which allows for a better and tighter fit with the first reinforcing ring a24 to enhance the strength of the reinforcing plug b and the paper card plug.

[0024] The third protrusion b2 has a protrusion b4 extending from one end near the paper tube. The protrusion b4 has a recessed locking cavity b41 in the inner wall of the reinforcing plug b, which is used to abut against the external locking part. The vertical height of the third protrusion b2 is less than or equal to the vertical height of the second groove a23. That is, when the vertical height of the third protrusion b2 is less than the vertical height of the second groove a23, the lower end face of the protrusion b4 cannot abut against the position of the abutting platform a21 on the inner wall of the locking part a2. It mainly relies on the abutment of the first reinforcing ring a24 and the second reinforcing ring b3 to form a stable fit. When the vertical height of the third protrusion b2 is equal to the vertical height of the second groove a23, the lower end face of the protrusion b4 can abut against the position of the abutting platform a21 on the inner wall of the locking part a2, which can disperse some of the pressure and enhance the stability of the fit between the paper plug and the reinforcing plug b. In this embodiment, six protrusions b4 are preferred, and correspondingly, the six protrusions b4 correspond to six locking cavities b41, which enhances the reliability of paper tube assembly (the rest is the same as in embodiment 1).

[0025] This embodiment of the plug assembly integrates a reinforcing plug b and a paper plug. Through the interlocking fit and reinforced structure, the assembly stability with the paper tube is significantly improved. The reinforcing plug b not only has a second through hole b1 corresponding to the first through hole a11 of the paper plug for the installation shaft to pass through, but its outer wall's third protrusion b2 also matches the second groove a23 on the inner wall of the paper plug's engaging portion a2, forming a tight interlocking connection. Simultaneously, the second reinforcing ring b3 at the distal end of the reinforcing plug b abuts against the first reinforcing ring a24 of the paper plug, further enhancing the overall structural strength. In particular, the design of the protrusion b4 on the third protrusion b2 and the locking cavity b41 on the inner wall of the reinforcing plug b not only allows for flexible adjustment of the fit according to the height of the third protrusion b2, but also effectively disperses pressure, enhancing stability and achieving a highly reliable and stable assembly between the plug assembly and the paper tube. (Other aspects are the same as in Embodiment 1.)

[0026] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A paper cartridge for a paper tube, characterized in that, The paper plug includes an integrally formed cylindrical paper plug body (a), the paper plug body (a) includes a connecting part (a1) inserted into a paper tube and a clamping part (a2) for clamping with the outside, the connecting part (a1) is provided with a first through hole (a11) capable of penetrating a rotating shaft, the connecting part (a1) is coaxially connected with the clamping part (a2), the clamping part (a2) is provided with an abutting table (a21) abutting with a cutting surface of the paper tube at one end close to the connecting part (a1), the outer diameter of the abutting table (a21) is greater than the inner diameter of the paper tube, at least two first protrusions (a22) are provided on the abutting table (a21) extending away from the paper tube along the outer wall of the clamping part (a2), and an abutting area (a221) is provided on one side of each of the first protrusions (a22) close to the paper tube, the abutting area (a221) extends radially out of the abutting table (a21), and when the connecting part (a1) is inserted into the paper tube, the abutting table (a21) and the abutting area (a221) abut with the cutting surface of the paper tube.

2. A paper cartridge for a paper tube according to claim 1, characterized in that The outer wall of the connecting part (a1) is provided with at least two second protrusions (a12), and a first groove (a13) is arranged between the two second protrusions (a12), the second protrusions (a12) abut with the inner wall of the connecting part (a1) when the connecting part (a1) is inserted into the paper tube, and the first groove (a13) forms an exhaust gap with the inner wall of the connecting part (a1).

3. A paper cartridge for a paper tube according to claim 1, wherein The diameter of the connecting part (a1) gradually increases from one end away from the clamping part (a2) to one end close to the clamping part (a2), and the diameter of the clamping part (a2) gradually increases from one end close to the connecting part (a1) to one end away from the connecting part (a1).

4. A paper cartridge for a paper tube according to claim 1, wherein The inner wall of the clamping part (a2) is provided with a second groove (a23) corresponding to the first protrusions (a22) of the outer wall of the clamping part (a2).

5. A paper cartridge for a paper tube according to claim 1, wherein Each of the first protrusions (a22) is a trapezoidal body, and the width of the first protrusion (a22) away from the paper tube end is greater than the width of the first protrusion (a22) close to the paper tube end.

6. A paper cartridge for a paper tube according to claim 1, wherein The abutting table (a21) is an arc-shaped transition surface.

7. A paper cartridge for a paper tube according to claim 1, wherein The one end of the clamping part (a2) away from the paper tube is outwardly folded to form a first reinforcing ring (a24).

8. A paper cartridge for a paper tube according to claim 1, wherein The number of the first protrusions (a22) is six, and the six first protrusions (a22) are uniformly distributed on the outer wall of the clamping part (a2).

9. A card retention assembly, comprising: The paper plug includes an integrally formed cylindrical paper plug body (a), the paper plug body (a) includes a connecting part (a1) inserted into a paper tube and a clamping part (a2) for clamping with the outside, the connecting part (a1) is provided with a first through hole (a11) capable of penetrating a rotating shaft, the connecting part (a1) is coaxially connected with the clamping part (a2), the clamping part (a2) is provided with an abutting table (a21) abutting with a cutting surface of the paper tube at one end close to the connecting part (a1), the outer diameter of the abutting table (a21) is greater than the inner diameter of the paper tube, at least two first protrusions (a22) are provided on the abutting table (a21) extending away from the paper tube along the outer wall of the clamping part (a2), and an abutting area (a221) is provided on one side of each of the first protrusions (a22) close to the paper tube, the abutting area (a221) extends radially out of the abutting table (a21), and when the connecting part (a1) is inserted into the paper tube, the abutting table (a21) and the abutting area (a221) abut with the cutting surface of the paper tube. The outer wall of the connecting part (a1) is provided with at least two second protrusions (a12), and a first groove (a13) is arranged between the two second protrusions (a12), the second protrusions (a12) abut with the inner wall of the connecting part (a1) when the connecting part (a1) is inserted into the paper tube, and the first groove (a13) forms an exhaust gap with the inner wall of the connecting part (a1). The diameter of the connecting part (a1) gradually increases from one end away from the clamping part (a2) to one end close to the clamping part (a2), and the diameter of the clamping part (a2) gradually increases from one end close to the connecting part (a1) to one end away from the connecting part (a1). The inner wall of the clamping part (a2) is provided with a second groove (a23) corresponding to the first protrusions (a22) of the outer wall of the clamping part (a2). Each of the first protrusions (a22) is a trapezoidal body, and the width of the first protrusion (a22) away from the paper tube end is greater than the width of the first protrusion (a22) close to the paper tube end. The abutting table (a21) is an arc-shaped transition surface. The one end of the clamping part (a2) away from the paper tube is outwardly folded to form a first reinforcing ring (a24). The number of the first protrusions (a22) is six, and the six first protrusions (a22) are uniformly distributed on the outer wall of the clamping part (a2).

10. A cassette assembly as defined in claim 9, wherein, Each of the third protrusions (b2) is provided with a protrusion (b4) near one end of the paper tube, and a clamping cavity (b41) for accommodating an external clamping site is formed in the reinforcing plug (b) at a position corresponding to the protrusion (b4), and the vertical height of the third protrusion (b2) is less than or equal to the vertical height of the second groove (a23).

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