A method of recycling a powder cartridge and a recycled powder cartridge

Abstract

The application relates to a recycling method of a powder cartridge and a recycled powder cartridge. The existing powder cartridge has a shell provided with a containing cavity, one end of the shell is provided with a first powder outlet communicated with the containing cavity, and the other end of the shell is a tail end. The recycling method comprises the following steps: cutting the tail end along the radial direction of the shell to form an opening communicated with the containing cavity; loading a developer into the containing cavity through the opening; and installing a sealing piece on the opening. The diameter of the opening is equal to the maximum inner diameter of the tail end where the opening is located, and the distance between the end surface of the opening and the first powder outlet is smaller than the distance between the end surface of the tail end and the first powder outlet. In the application, when the developer in the containing cavity is exhausted or less than a set amount, the structure of the powder cartridge is still intact, so the recycling of the powder cartridge can be realized by filling the developer into the containing cavity through the opening and then sealing the opening through the sealing piece, and waste is reduced. The processing method of the opening obtained by cutting the tail end is simple, easy to realize, and high in recycling efficiency.

Description

Technical Field

[0001] This application relates to the field of printing consumables technology, and in particular to a method for recycling toner cartridges and a toner cartridge recycling method. Background Technology

[0002] A toner cartridge is a printing consumable that stores developer (toner). When the developer stored in the cartridge is used up, the cartridge structure is not damaged. Therefore, it can be reused simply by refilling the developer. Thus, the empty cartridge can be recycled and refilled with developer, thereby avoiding material waste.

[0003] However, existing toner cartridges lack an opening for refilling developer. Forcibly disassembling them could damage the cartridge's structure. Drilling holes at the end of the cartridge could allow debris to fall inside, contaminating the developer and affecting print quality. Therefore, existing toner cartridges are difficult to recycle. Summary of the Invention

[0004] This application provides a method for recycling powder cartridges and a method for recycling powder cartridges. The method for recycling powder cartridges can solve the problem that powder cartridges are difficult to recycle due to difficulty in filling them with powder.

[0005] This application provides a method for recycling powder cartridges, which is used to recycle existing powder cartridges. The existing powder cartridge has a shell, the shell is provided with a receiving cavity, one end of the shell is provided with a first powder outlet communicating with the receiving cavity, and the other end of the shell is a tail end.

[0006] The recycling method includes:

[0007] The tail end is cut radially along the housing to form an opening communicating with the receiving cavity;

[0008] Developer is loaded into the receiving cavity through the opening;

[0009] Install the seal into the opening;

[0010] Wherein, the diameter of the opening is equal to the maximum inner diameter of the tail end where the opening is located, and the distance from the end face of the opening to the first powder outlet is less than the distance from the end face of the tail end to the first powder outlet.

[0011] In one possible design, the distance between the end face of the seal and the first powder outlet is less than or equal to the distance between the end face of the tail end and the first powder outlet.

[0012] In one possible design, the step of cutting the tail end radially along the housing includes cutting the tail end by means of thermal cutting or wire cutting.

[0013] In one possible design, after the step of cutting the tail end radially along the housing to form an opening communicating with the receiving cavity, and before the step of loading developer into the receiving cavity through the opening, the recycling method further includes cleaning the housing.

[0014] In one possible design, the step of cleaning the housing includes:

[0015] The developer in the receiving cavity is poured out through the opening;

[0016] Residual developer is removed by blowing air into the opening and the receiving cavity.

[0017] In one possible design, the existing powder cartridge includes a powder dispensing assembly, which is provided with a second powder outlet, and an outlet seal is affixed to the second powder outlet;

[0018] Step: After installing the seal on the opening, the recycling method further includes: tearing off the old outlet seal and attaching a new outlet seal.

[0019] In one possible design, after installing the seal on the opening, the recycling method further includes checking the opening for powder leakage.

[0020] This application provides a powder recycling cylinder, which is processed by the powder recycling method described above. The powder recycling cylinder includes a shell and a sealing element. The shell is provided with a receiving cavity. The shell has a first powder outlet and an opening. The first powder outlet and the opening are respectively provided at both ends of the shell along the length direction. The sealing element is detachably provided at the opening.

[0021] In one possible design, the seal includes a sealing cap and a sealing plug. The sealing cap includes a first connecting portion and a second connecting portion. The first connecting portion engages with the opening, and the sealing plug is fitted around the outer periphery of the second connecting portion.

[0022] In one possible design, the sealing cap and the sealing plug are integrally formed or separately disposed.

[0023] In one possible design, the seal further includes a support member, which includes a third connecting portion and a support portion, the third connecting portion being connected to the second connecting portion, and the diameter of the support portion gradually increasing in the direction away from the sealing cover.

[0024] In one possible design, the second connecting portion has multiple slits along the circumferential direction, and the supporting portion has multiple supporting protrusions correspondingly along the circumferential direction, and the slits can cooperate with the supporting protrusions.

[0025] In one possible design, the outer periphery of the sealing plug is provided with multiple annular protrusions.

[0026] In this application, when the developer in the receiving cavity is depleted or falls below a set amount, the toner cartridge can no longer supply developer to the developing device, but the structure of the toner cartridge remains intact. Therefore, developer is poured into the receiving cavity through the opening, and then the opening is sealed by a sealant, thereby achieving the recycling of the toner cartridge and reducing waste. The processing method of obtaining the opening by cutting off the tail end is simple, easy to implement, and has high recycling efficiency.

[0027] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the recycling powder cylinder provided in this application in a specific embodiment;

[0029] Figure 2 for Figure 1 Schematic diagram of the middle shell structure;

[0030] Figure 3 for Figure 2 A partial structural diagram of the middle shell;

[0031] Figure 4 for Figure 1 A schematic diagram of the structure of the sealing element in the first specific embodiment;

[0032] Figure 5 for Figure 4 Exploded view;

[0033] Figure 6 for Figure 4 A schematic diagram of the structure in which the seal is installed in the opening;

[0034] Figure 7 for Figure 1 A schematic diagram of the structure of the sealing element in the second specific embodiment;

[0035] Figure 8 for Figure 7 Exploded view;

[0036] Figure 9 for Figure 7 A schematic diagram of the structure in which the seal is installed in the opening;

[0037] Figure 10 for Figure 1 Schematic diagram of the powder outlet assembly;

[0038] Figure 11 for Figure 10 Exploded view;

[0039] Figure 12 for Figure 10 Cross-sectional view;

[0040] Figure 13 for Figure 1 A schematic diagram of the middle end cap.

[0041] Figure label:

[0042] 1-Shell;

[0043] 11-First powder outlet;

[0044] 12-Opening;

[0045] 2-Seals;

[0046] 21-Sealing cap;

[0047] 211-First connecting part;

[0048] 212 - Second connecting part;

[0049] 213 - Limiting protrusion;

[0050] 214 - Incision;

[0051] 22-Sealing plug;

[0052] 23-Supporting component;

[0053] 231-Third connecting part;

[0054] 232-Support section;

[0055] 233 - Support protrusion;

[0056] 24-Connector;

[0057] 3-Powder dispensing component;

[0058] 31-Drive receiver;

[0059] 32-Flange portion;

[0060] 321 - Second powder outlet;

[0061] 33-Baffle;

[0062] 34-Pump section;

[0063] 35 - Reciprocating components;

[0064] 4-End cap;

[0065] 41 - Detect protrusions.

[0066] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0067] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0068] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0069] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0070] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0071] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0072] This application provides a powder recycling cylinder and a method for recycling powder cylinders. The recycling method can recycle and process existing powder cylinders to obtain recycled powder cylinders.

[0073] like Figure 1 As shown, the recycling cartridge includes: a housing 1 and a sealing element 2. The housing 1 is provided with a receiving cavity, which can store developer. Figure 2 and Figure 3 As shown, the housing 1 has a first powder outlet 11 and an opening 12, which are respectively disposed at both ends of the housing 1 along the length direction. The sealing member 2 is detachably disposed at the opening 12.

[0074] In this embodiment, such asFigures 1 to 3 As shown, after the recycled toner cartridge is loaded into the developing device, the developer in the receiving cavity can be supplied to the developing device through the first toner outlet 11. When the developer in the receiving cavity is exhausted or less than the set amount, the toner cartridge can no longer supply developer to the developing device, but the structure of the toner cartridge is still intact. Therefore, developer is poured into the receiving cavity through the opening 12, and then the opening 12 is sealed by the sealing member 2, thereby realizing the recycling of the toner cartridge and reducing waste.

[0075] Specifically, the recycling cylinder is obtained by processing an existing cylinder. The end of the existing cylinder without the first outlet 11 is designated as the tail end. The tail end includes a first section and a second section. The second section is connected to the end of the first section furthest from the first outlet 11. The diameter of the first section is smaller than the diameter of the second section, and the diameter of the first section varies uniformly. The diameter of the second section is the same at different locations. Since the wall thickness is basically the same at different locations of the tail end, the inner diameter of the first section is smaller than the inner diameter of the second section. The inner diameter of the second section is the same at different locations, and the inner diameter of the second section is the maximum inner diameter of the tail end.

[0076] Recycling methods include:

[0077] S1: Cut the tail end radially along the housing 1 to form an opening 12 that communicates with the receiving cavity.

[0078] In this step, the tail end can be cut by thermal cutting, wire cutting, or other cutting methods.

[0079] S2: The developer is loaded into the receiving cavity through the opening 12.

[0080] In this step, the powder cartridge is placed on the filling machine with the opening 12 facing upwards. After the opening 12 is aligned with the filling port on the filling machine, the developer is injected into the receiving cavity.

[0081] S3: Install seal 2 into opening 12.

[0082] The processing method of obtaining opening 12 by cutting off the tail end is simple, easy to implement, and has a high recycling efficiency.

[0083] In step S1, if the diameter of the opening 12 obtained from each cut is different, a matching seal 2 needs to be produced according to the diameter of the opening 12 after each cut, resulting in low production efficiency and high cost. Since the inner diameter is the same at different positions of the second segment at the tail end, cutting the second segment at the tail end can obtain an opening 12 with a fixed diameter, that is, the diameter of the opening 12 is the same as the maximum inner diameter of the tail end, thereby enabling the production of more seals 2 in advance and improving the recycling efficiency of the powder cylinder.

[0084] Meanwhile, because part of the tail end is cut off, the distance from the opening 12 to the first powder outlet 11 is less than the distance from the end face of the tail end to the first powder outlet 11. To ensure that the recycled powder cartridge can be matched with the developing device, the length of the sealing element 2 is adjusted so that the distance from the end face of the sealing element 2 to the first powder outlet 11 is less than or equal to the distance from the end face of the tail end to the first powder outlet 11. That is, the maximum length of the recycled powder cartridge is the same as or less than the maximum length of the existing powder cartridge.

[0085] In one specific implementation, such as Figure 4 , Figure 5 and Figure 6 As shown, the sealing element 2 includes a sealing cover 21 and a sealing plug 22. The sealing cover 21 includes a first connecting part 211 and a second connecting part 212. The first connecting part 211 is engaged with the opening 12, and the sealing plug 22 is sleeved on the outer periphery of the second connecting part 212.

[0086] In this embodiment, such as Figure 4 , Figure 5 and Figure 6 As shown, the sealing plug 22 is sleeved on the outer periphery of the second connecting part 212. The second connecting part 212 can support the sealing plug 22, so that when the sealing member 2 is installed in the opening 12, the sealing plug 22 can abut against the inner wall of the opening 12 to a large extent, thereby ensuring the sealing effect of the sealing member 2 on the opening 12. The sealing plug 22 can be made of rubber, silicone, etc.

[0087] Specifically, such as Figure 5 and Figure 6 As shown, the first connecting portion 211 is provided with an annular groove, and the sidewall of the opening 12 can extend into the annular groove, so that the seal 2 is reliably connected to the opening 12. The end of the second connecting portion 212 away from the first connecting portion 211 is provided with a limiting protrusion 213, which can abut against the sealing plug 22, thereby restricting the movement of the sealing plug 22 and preventing the sealing plug 22 from falling off the second connecting portion 212. Figure 4 As shown, multiple limiting protrusions 213 can be provided on the first connecting part 211, for example, two limiting protrusions 213 can be symmetrically provided.

[0088] Optionally, the sealing cap 21 and the sealing plug 22 can be integrally formed or separately formed. When the sealing cap 21 and the sealing plug 22 are integrally formed, it is convenient to assemble the sealing element 2 with the opening 12; when the sealing cap 21 and the sealing plug 22 are separately formed, it is convenient to adjust the position of the sealing plug 22, improve the fit between the sealing plug 22 and the inner wall of the opening 12, and thus improve the sealing effect of the sealing element 2.

[0089] In one specific implementation, such as Figure 7 , Figure 8 and Figure 9As shown, the seal 2 also includes a support 23, which includes a third connecting part 231 and a support part 232. The third connecting part 231 is connected to the second connecting part 212. The diameter of the support part 232 gradually increases in the direction away from the sealing cover 21.

[0090] In this embodiment, such as Figure 7 , Figure 8 and Figure 9 As shown, the sealing plug 22 is sleeved on the outer periphery of the sealing cap 21 and the support member 23. The support member 23 can support the sealing plug 22, thereby further improving the fit between the sealing plug 22 and the opening 12 and ensuring the sealing effect of the sealing member 2.

[0091] Specifically, such as Figure 8 As shown, the second connecting part 212 is provided with a plurality of cuts 214 along the circumferential direction, and the supporting part 232 is provided with a plurality of supporting protrusions 233 along the circumferential direction. The cuts 214 can cooperate with the supporting protrusions 233.

[0092] like Figure 8 As shown, the support protrusion 233 on the support member 23 can pass through the cutout 214 on the second connecting part 212, thereby contacting the sealing plug 22 and supporting the sealing plug 22.

[0093] Since the inner diameter of the first section at the tail end gradually decreases and then increases along the length of the powder cylinder, that is, the inner diameter of the two ends of the first section is greater than the inner diameter of the middle part of the first section, the support protrusion 233 on the support member 23 passes through the cut 214 on the second connecting part 212 to support the sealing plug 22, so that the sealing plug 22 can fit against the inner wall of the part of the first section away from the opening 12, thereby improving the sealing effect of the sealing member 2.

[0094] Furthermore, such as Figure 8 and Figure 9 As shown, the diameter of the support member 23 gradually increases in the direction away from the sealing cover 21, so that the sealing plug 22 fits more closely to the inner wall of the first section away from the opening 12.

[0095] Furthermore, the second connecting portion 212 has a mounting groove, in which at least a portion of the support member 23 is accommodated. A first mounting hole is provided at the bottom of the mounting groove, and a second mounting hole is provided on the third connecting portion 231. The sealing member 2 also includes a connector 24, which passes through the first and second mounting holes in sequence, thereby ensuring the reliable connection between the support member 23 and the sealing cover 21. The connector 24 can be a screw, etc.

[0096] In one specific implementation, such as Figure 5 and Figure 8As shown, the outer periphery of the sealing plug 22 is provided with multiple annular protrusions. The annular protrusions can fit against the inner wall of the opening 12 under the support of the sealing cover 21 and / or the support member 23, thereby ensuring the sealing effect of the sealing plug 22.

[0097] In one specific embodiment, after step S1: cutting the tail end radially along the housing 1 to form an opening 12 communicating with the receiving cavity, and before step S2: loading developer into the receiving cavity through the opening 12, the recovery method further includes: S11: cleaning the housing 1.

[0098] In step S11, cleaning the housing 1 first requires pouring out the residual developer in the receiving cavity through the opening 12 and collecting the poured-out developer in a bag. Then, an air gun is used to blow air into the receiving cavity and the opening 12 to clean the developer adhering to the housing 1, thereby cleaning the housing 1.

[0099] After step S3, since there is no residual developer in the receiving cavity, the recovery powder cartridge can hold a developer of a different color than the developer previously held.

[0100] Furthermore, to ensure that there is no residual developer in the container when filling the developer, before placing the powder canister on the filling machine, place a piece of white paper on the table and tap the powder canister 3 to 5 times with the opening 12 facing down.

[0101] In one specific implementation, such as Figure 10 , Figure 11 and Figure 12 As shown, the powder cartridge also includes a powder dispensing assembly 3, which is disposed at the first powder outlet 11. The powder dispensing assembly 3 includes a drive receiving part 31, a flange part 32, a baffle 33, a pump part 34, and a reciprocating part 35. After the powder cartridge is loaded into the developing device, the drive receiving part 31 can receive power from the developing device, thereby driving the housing 1 to rotate. A second powder outlet 321 is provided on the flange part 32, and the developing device has a powder inlet. The second powder outlet 321 can cooperate with the powder inlet to supply developer from the powder cartridge to the developing device. The baffle 33 can slide relative to the flange part 32, thereby closing the second powder outlet 321 when it is not necessary to supply developer to the developing device, preventing developer leakage. The pump part 34 and the reciprocating part 35 are engaged, so that when the reciprocating part 35 reciprocates, the volume of the pump part 34 changes accordingly, thereby replenishing the receiving cavity with gas to ensure that the developer can be smoothly discharged from the receiving cavity.

[0102] Specifically, the second powder outlet 321 is provided with an outlet sealing part (not shown in the figure), which is generally bonded to the flange part 32 with double-sided adhesive.

[0103] In one specific embodiment, after step S3: installing the seal 2 into the opening 12, the recycling method further includes:

[0104] S4: Tear off the old outlet seal on the flange 32 and attach the new outlet seal.

[0105] In this step, the outlet seal is replaced to prevent the old outlet seal from failing due to aging, causing developer leakage and contaminating the toner cartridge, developing equipment, etc.

[0106] Specifically, first slide the baffle 33 to expose the second powder outlet 321, then use tweezers or other tools to tear off the old outlet seal, remove the residual adhesive on the flange 32, attach the new outlet seal, and press the new outlet seal firmly. Finally, slide the baffle 33 to seal the second powder outlet 321.

[0107] In one specific embodiment, after step S3: installing the seal 2 into the opening 12, the recycling method further includes:

[0108] S5: Check if powder is leaking from opening 12.

[0109] In this step, checking whether the opening 12 is leaking powder can prevent the seal 2 from falling off the opening 12 during the transportation or use of the powder cartridge due to incorrect installation of the seal 2, causing the developer to leak through the opening 12 and contaminate the powder cartridge.

[0110] Specifically, lay 10 to 15 sheets of white paper on the table, tap the powder tube 3 to 5 times with the opening 12 facing down, and then tap the powder tube 3 to 5 times with the opening 12 facing up, to check whether the opening 12 or the powder dispensing component 3 is leaking powder.

[0111] In one specific implementation, such as Figure 1 and Figure 13 As shown, the toner cartridge has an end cap 4, which is connected to the toner dispensing assembly 3 and protects the assembly. The end cap 4 has a detection protrusion 41. For toner cartridges containing different colors of developer, the structure or position of the detection protrusion 41 on the end cap 4 will differ. Therefore, after checking that the opening 12 does not leak toner, the end cap 4 matching the color of the developer it carries needs to be placed on the toner dispensing assembly 3, and the housing 1 needs to be checked to ensure it can rotate smoothly relative to the end cap 4.

[0112] In addition, before performing step S1: cutting the tail end radially along the housing 1, the end cap 4 needs to be removed to prevent damage to the end cap 4 during the cutting process.

[0113] If the end cap 4 used during toner cartridge recycling is used, and the color of the end cap 4 is different from the color of the developer it contains, then the detection protrusion 41 needs to be cut off, the location of the detection protrusion 41 needs to be repaired and flattened, and then the detection protrusion 41 of the corresponding color needs to be installed.

[0114] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for recycling powder cartridges, used to recycle existing powder cartridges, characterized in that, The existing powder cylinder has a shell (1), the shell (1) is provided with a receiving cavity, one end of the shell (1) is provided with a first powder outlet (11) communicating with the receiving cavity, and the other end of the shell (1) is a tail end; The recycling method includes: Cut the tail end radially along the housing (1) to form an opening (12) communicating with the receiving cavity; Developer is loaded into the receiving cavity through the opening (12); Install the seal (2) into the opening (12); Wherein, the diameter of the opening (12) is equal to the maximum inner diameter of the tail end where the opening (12) is located, and the distance from the end face of the opening (12) to the first powder outlet (11) is less than the distance from the end face of the tail end to the first powder outlet (11).

2. The method for recycling powder cartridges according to claim 1, characterized in that, The distance between the end face of the seal (2) and the first powder outlet (11) is less than or equal to the distance between the end face of the tail end and the first powder outlet (11).

3. The method for recycling powder cartridges according to claim 1, characterized in that, Step: Cutting the tail end radially along the housing (1) includes: The tail end is cut by thermal cutting or wire cutting.

4. The method for recycling powder cartridges according to claim 1, characterized in that, Step: After cutting the tail end radially along the housing (1) to form an opening (12) communicating with the receiving cavity, the recovery method further includes the following steps: before loading developer into the receiving cavity through the opening (12): Clean the housing (1).

5. The method for recycling powder cartridges according to claim 4, characterized in that, Step: Cleaning the housing (1) includes: The developer in the receiving cavity is poured out through the opening (12); Residual developer is removed by blowing air into the opening (12) and the receiving cavity.

6. The method for recycling powder cartridges according to any one of claims 1-5, characterized in that, The existing powder cylinder includes a powder dispensing component (3), which is provided with a second powder outlet (321), and an outlet sealing part is attached to the second powder outlet (321); Step: After installing the seal (2) into the opening (12), the recycling method further includes: Remove the old outlet seal and attach the new outlet seal.

7. The method for recycling powder cartridges according to any one of claims 1-5, characterized in that, Step: After installing the seal (2) into the opening (12), the recycling method further includes: Check whether the opening (12) leaks powder.

8. A powder recycling cartridge, processed by the powder recycling method according to any one of claims 1 to 7, characterized in that, The recycling powder cylinder includes: The housing (1) is provided with a receiving cavity. The housing (1) has a first powder outlet (11) and an opening (12). The first powder outlet (11) and the opening (12) are respectively provided at both ends of the housing (1) along the length direction. A seal (2) is detachably disposed in the opening (12).

9. The recycling powder cylinder according to claim 8, characterized in that, The sealing element (2) includes a sealing cap (21) and a sealing plug (22). The sealing cap (21) includes a first connecting part (211) and a second connecting part (212). The first connecting part (211) engages with the opening (12), and the sealing plug (22) is sleeved on the outer periphery of the second connecting part (212).

10. The recycling powder cylinder according to claim 9, characterized in that, The sealing cap (21) and the sealing plug (22) are integrally formed or separately configured.

11. The recycling powder cylinder according to claim 9, characterized in that, The sealing element (2) further includes a support element (23), which includes a third connecting part (231) and a support part (232). The third connecting part (231) is connected to the second connecting part (212), and the diameter of the support part (232) gradually increases in the direction away from the sealing cover (21).

12. The recycling powder cylinder according to claim 11, characterized in that, The second connecting part (212) is provided with a plurality of slits (214) along the circumferential direction, and the supporting part (232) is provided with a plurality of supporting protrusions (233) along the circumferential direction. The slits (214) can cooperate with the supporting protrusions (233).

13. The recycling powder cylinder according to any one of claims 9-12, characterized in that, The outer periphery of the sealing plug (22) is provided with multiple annular protrusions.

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