Multi-channel 3D printing equipment spray head

Abstract

The utility model belongs to the technical field of multi-channel 3D printing equipment spray heads, and particularly relates to a multi-channel 3D printing equipment spray head which comprises a spray head body and a plurality of inserting grooves, the inserting grooves are formed in the bottom face of the spray head body, inner cavities of the inserting grooves are communicated with an inner cavity of the spray head body, and spray nozzles are inserted into the inserting grooves. The multiple fixing assemblies are located in the multiple nozzles correspondingly and used for fixing the multiple nozzles in the multiple inserting grooves correspondingly; the utility model solves the problem of poor sealing caused by untight connection between the nozzle and the printing head due to incorrect alignment and fastening when the nozzle is mounted, and solves the problem that when the nozzle on the spray head of the multi-channel 3D printing equipment is blocked in a long-time use process and needs to be detached and cleaned, the nozzle cannot be tightly connected with the printing head. The problem that the working efficiency is reduced due to the fact that the nozzle is fixed on the spray head in a threaded connection mode and the time consumed for disassembly is long is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of multi-channel 3D printing equipment nozzles, and in particular relates to a multi-channel 3D printing equipment nozzle. Background Art

[0002] The nozzle of a multi-channel 3D printing device is one of the key components of a multi-channel 3D printing device. It is responsible for introducing and extruding printing materials (such as thermoplastics, metal powders, ceramic materials, etc.) onto the printing platform to build a three-dimensional object layer by layer.

[0003] The printhead usually consists of multiple parts, including the nozzle, extrusion mechanism, heating device, etc. The nozzle is the core part of the printhead, responsible for melting the hot melt material and forming filaments. Its aperture size directly affects the printing accuracy and speed. The extrusion mechanism consists of a motor and gears, which are used to drive the plastic filament through the nozzle. The speed of the motor determines the output speed of the plastic filament, thus affecting the printing quality.

[0004] In multi-channel 3D printing equipment, the nozzle usually has multiple channels, which can print with multiple different materials or colors at the same time, so as to achieve more complex and finer printing effects. These nozzles can usually be replaced and adjusted as needed to meet different printing needs.

[0005] When the user installs the nozzle on the nozzle of a multi-channel 3D printing device, if the nozzle is not properly aligned and tightened during installation, the connection between the nozzle and the print head may not be tight, resulting in poor sealing. In addition, when the nozzle on the nozzle of the multi-channel 3D printing device is clogged during long-term use and needs to be disassembled for cleaning, it will take a long time to disassemble because it is fixed on the nozzle by threaded connection, which reduces work efficiency. In view of this, we propose a nozzle for a multi-channel 3D printing device. Utility Model Content

[0006] The purpose of the utility model is to provide a multi-channel 3D printing equipment nozzle to solve the problems raised in the above background technology.

[0007] In view of this, the utility model provides a multi-channel 3D printing equipment nozzle, including:

[0008] A nozzle body and a plurality of slots, wherein the plurality of slots are provided on the bottom surface of the nozzle body, and the inner cavities of the plurality of slots are connected to the inner cavity of the nozzle body, and nozzles are inserted into the slots;

[0009] A plurality of fixing components, each of which is located in the plurality of nozzles and is used to fix the plurality of nozzles in the plurality of slots;

[0010] Multiple first sliding grooves are respectively formed on the top surfaces of multiple nozzles, and the inner cavities of the multiple first sliding grooves are respectively communicated with the inner cavities of the multiple nozzles. A slider is slidably connected in the first sliding groove, and the upper half of the slider extends into the slot and is slidably connected with the slot. The bottom surface of the slider is fixedly connected with a through pipe that slides in the first sliding groove, and the inner cavity of the through pipe is communicated with the inner cavity of the nozzle and the inner cavity of the slider. The top surface of the slider is fixedly connected with a sealing piece, and the sealing piece is communicated with the inner cavity of the spray head body and the inner cavity of the slider. Two threaded rods are threadedly connected in the slider;

[0011] Multiple driving components are respectively located in the multiple nozzles and are used to respectively drive the corresponding two threaded rods to rotate.

[0012] Based on the above structure, through the provided first sliding groove and slider, it is ensured that the lower half of the slider can slide in the first sliding groove. Through the provided through pipe, it is ensured that when the slider slides along the first sliding groove, the slider can always be communicated with the inner cavity of the nozzle through the through pipe. Through the provided driving component and threaded rod, it is ensured that the user can drive the two threaded rods to rotate through the driving component, and the slider moves under the action of the threads of the two threaded rods. Through the provided sealing piece, it is ensured that when the slider moves upward, the slider can drive the sealing piece to move upward, so that the sealing piece is closely attached to the top surface of the inner cavity of the slot, preventing material leakage. Through the provided slot and nozzle, it is ensured that the nozzle can be inserted into the slot. Through the provided fixing component, it is ensured that the user can quickly fix the nozzle in the slot through the fixing component and ensure that the user can quickly release the fixing of the nozzle through the fixing component.

[0013] In the above technical solution, further, the fixing component includes:

[0014] Two second sliding grooves are symmetrically formed in the nozzle and are communicated with the inner cavity of the slot. Two insertion blocks are respectively slidably connected in the two second sliding grooves, and one end of the two insertion blocks extends to the inner wall of the slot and is inserted and matched with the slot. A spring fixed to the inner wall of the second sliding groove is fixedly connected to the insertion block.

[0015] In this technical solution, it is ensured that the user can quickly disassemble the nozzle.

[0016] In the above technical solution, further, the insertion block is in an inverted "匸" shape.

[0017] In this technical solution, it is ensured that the user can drive one end of the insertion block to move through the other end of the insertion block.

[0018] In the above technical solution, further, the driving component includes:

[0019] Two rotating grooves, the two rotating grooves are symmetrically opened in the nozzle and communicated with the first slide groove, a gear is rotatably connected in the rotating groove, a transmission rod is fixedly connected to the top surface of the gear, and one end of the transmission rod extends into the first slide groove and is fixed to the bottom end of the threaded rod;

[0020] An annular groove is provided on the circumferential side of the nozzle and is connected to the two rotating grooves. A gear ring meshing with two gears is rotatably connected in the annular groove. A rotating ring is fixedly connected to the circumferential side of the gear ring. The rotating ring is located on the circumferential side of the nozzle and is rotatably connected to the circumferential side of the nozzle.

[0021] In this technical solution, it is ensured that the material in the nozzle body will not leak.

[0022] In the above technical solution, further, the transmission rod is located in the rotation groove and is rotationally connected to the rotation groove.

[0023] In this technical solution, it is ensured that the transmission rod can rotate normally in the rotation groove.

[0024] In the above technical solution, further, one end of the transmission rod is rotatably connected to the first sliding groove.

[0025] In this technical solution, it is ensured that one end of the transmission rod can rotate normally in the first sliding groove.

[0026] In the above technical solution, further, anti-slip grooves are provided on the circumferential side of the swivel.

[0027] In the technical solution, the anti-slip grooves provided on the circumferential side of the swivel can increase the friction between the user's hand and the swivel, making it easier for the user to turn the swivel.

[0028] In the above technical solution, further, a sealing sleeve is fixedly connected to the circumferential side of the through pipe.

[0029] In this technical solution, it is ensured that the material will not leak through the gap between the through pipe and the first chute.

[0030] The beneficial effects of the utility model are:

[0031] 1. The nozzle of the multi-channel 3D printing device ensures that the lower half of the slider can slide in the first slide groove by providing the first slide groove and the slider. The through pipe is provided to ensure that when the slider slides along the first slide groove, the slider is always connected with the inner cavity of the nozzle through the through pipe. The driving assembly and threaded rod are provided to ensure that the user can drive the two threaded rods to rotate through the driving assembly, so that the slider is moved by the action of the threads of the two threaded rods. The sealing sheet is provided to ensure that when the slider moves upward, the slider can drive the sealing sheet to move upward, so that the sealing sheet is tightly attached to the top surface of the inner cavity of the slot to prevent material leakage, thereby solving the problem that if the nozzle is not properly aligned and tightened when installing, the connection between the nozzle and the print head may be loose, resulting in poor sealing.

[0032] 2. The nozzle of the multi-channel 3D printing device ensures that the nozzle can be inserted into the slot by providing a slot and a nozzle. The fixed component provided ensures that the user can quickly fix the nozzle in the slot through the fixed component, and ensures that the user can quickly release the fixation of the nozzle through the fixed component. This solves the problem that when the nozzle on the nozzle of the multi-channel 3D printing device is blocked during long-term use and needs to be disassembled for cleaning, the nozzle is fixed on the nozzle by a threaded connection, resulting in a long time consumed for disassembly and reduced work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0034] Figure 2 It is a schematic diagram of the explosion structure of the area of ​​the utility model;

[0035] Figure 3 It is a schematic diagram of a partial explosion structure of the utility model;

[0036] Figure 4 This is one of the schematic diagrams of the internal structure of the nozzle of the utility model;

[0037] Figure 5 This is the second schematic diagram of the internal structure of the nozzle of the utility model.

[0038] The symbols in the figure are:

[0039] 1. Nozzle body; 2. Slot; 3. Nozzle; 4. First slide groove; 5. Slider; 6. Through pipe; 7. Sealing sheet; 8. Threaded rod; 9. Second slide groove; 10. Insert; 11. Spring; 12. Rotating groove; 13. Gear; 14. Transmission rod; 15. Annular groove; 16. Gear ring; 17. Rotating ring. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0041] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0043] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0044] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0045] Embodiment 1:

[0046] See also Figure 1 - Figure 5 As shown, this embodiment provides a multi-channel 3D printing device nozzle, including:

[0047] A nozzle body 1 and a plurality of slots 2, wherein the plurality of slots 2 are provided on the bottom surface of the nozzle body 1, and the inner cavities of the plurality of slots 2 are connected to the inner cavity of the nozzle body 1, and nozzles 3 are inserted into the slots 2;

[0048] A plurality of fixing components, each of which is located in the plurality of nozzles 3 and is used to fix the plurality of nozzles 3 in the plurality of slots 2;

[0049] A plurality of first slide grooves 4, the plurality of first slide grooves 4 are respectively opened on the top surfaces of the plurality of nozzles 3, and the inner cavities of the plurality of first slide grooves 4 are respectively connected with the inner cavities of the plurality of nozzles 3, a slider 5 is slidably connected in the first slide groove 4, and the upper half of the slider 5 extends into the slot 2 and is slidably connected with the slot 2, a through pipe 6 that slides with the first slide groove 4 is fixedly connected to the bottom surface of the slider 5, and the inner cavity of the through pipe 6 is connected with the inner cavity of the nozzle 3 and the inner cavity of the slider 5, a sealing sheet 7 is fixedly connected to the top surface of the slider 5, and the sealing sheet 7 is connected with the inner cavity of the nozzle body 1 and the inner cavity of the slider 5, and two threaded rods 8 are connected to the inner thread of the slider 5;

[0050] Multiple driving assemblies are respectively located in the multiple nozzles 3 and are used to drive the corresponding two threaded rods 8 to rotate respectively.

[0051] Embodiment 2:

[0052] This embodiment provides a nozzle for a multi-channel 3D printing device. In addition to the technical solutions of the above embodiments, it also has the following technical features. The fixing component includes:

[0053] Two second sliding grooves 9 are symmetrically formed in the nozzle 3 and communicate with the inner cavity of the slot 2. Two inserting blocks 10 are respectively slidably connected in the two second sliding grooves 9. One end of each of the two inserting blocks 10 extends to the inner wall of the slot 2 and is in plug-in fit with the slot 2. A spring 11 fixed to the inner wall of the second sliding groove 9 is fixedly connected to the inserting block 10.

[0054] Wherein, when the inner cavity of the nozzle 3 is blocked and needs to be disassembled and cleaned, the user presses the other ends of the two inserting blocks 10 with hands, so that the other ends of the two inserting blocks 10 drive one ends of the two inserting blocks 10 to enter the two second sliding grooves 9 from the inner wall of the slot 2 respectively, and the two inserting blocks 10 compress the two springs 11 respectively. At this time, the fixing of the nozzle 3 is released. Subsequently, the user can clean and dredge the nozzle 3. After the nozzle 3 is cleaned and dredged, the user inserts the nozzle 3 into the slot 2 with hands. Then, the user releases the hands pressing the other ends of the two inserting blocks 10, so that one ends of the two inserting blocks 10 are inserted into the inner wall of the slot 2 under the action of the rebounding forces of the two springs 11 respectively, ensuring that the user can quickly disassemble the nozzle 3.

[0055] Embodiment 3:

[0056] This embodiment provides a nozzle for a multi-channel 3D printing device. In addition to the technical solutions of the above embodiments, it also has the following technical features. The inserting block 10 is in an inverted "C" shape.

[0057] Wherein, it is ensured that the user can drive one end of the inserting block 10 to move through the other end of the inserting block 10.

[0058] Embodiment 4:

[0059] This embodiment provides a nozzle for a multi-channel 3D printing device. In addition to the technical solutions of the above embodiments, it also has the following technical features. The driving component includes:

[0060] Two rotating grooves 12 are symmetrically formed in the nozzle 3 and communicate with the first sliding groove 4. A gear 13 is rotatably connected in the rotating groove 12. A transmission rod 14 is fixedly connected to the top surface of the gear 13. One end of the transmission rod 14 extends into the first sliding groove 4 and is fixed to the bottom end of the threaded rod 8;

[0061] An annular groove 15 is formed on the peripheral side of the nozzle 3 and communicates with the two rotating grooves 12. A toothed ring 16 meshing with the two gears 13 is rotatably connected in the annular groove 15. A rotating ring 17 is fixedly connected to the peripheral side of the toothed ring 16. The rotating ring 17 is located on the peripheral side of the nozzle 3 and is rotatably connected to the peripheral side of the nozzle 3.

[0062] Among them, when the user fixes the nozzle 3 in the slot 2, the user rotates the swivel 17 by hand, so that the swivel 17 drives the gear ring 16 to rotate in the annular groove 15, so that the gear ring 16 drives the two gears 13 to rotate in the two rotating grooves 12 respectively. When the two gears 13 rotate, the two gears 13 will respectively drive the two threaded rods 8 to rotate in the slider 5 through the two transmission rods 14, so that the slider 5 is affected by the threads of the two threaded rods 8 and moves upward along the first slide groove 4. When the slider 5 moves upward, the slider 5 will drive the through pipe 6 to move upward in the first slide groove 4, so that the slider 5 can always be connected with the inner cavity of the nozzle 3 through the through pipe 6. At the same time, the slider 5 will also drive the sealing sheet 7 to move upward. When the sealing sheet 7 moves upward to a position where it cannot move, the sealing sheet 7 will be tightly attached to the top surface of the inner wall of the slot 2 to ensure that the material in the nozzle body 1 will not leak.

[0063] Embodiment 5:

[0064] This embodiment provides a multi-channel 3D printing device nozzle, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the transmission rod 14 is located in the rotating groove 12 and is rotatably connected to the rotating groove 12.

[0065] Herein, it is ensured that the transmission rod 14 can rotate normally in the rotation groove 12 .

[0066] Embodiment 6:

[0067] This embodiment provides a multi-channel 3D printing equipment nozzle, which, in addition to the technical solutions of the above embodiments, also has the following technical features: one end of the transmission rod 14 is rotatably connected to the first slide groove 4.

[0068] Here, it is ensured that one end of the transmission rod 14 can rotate normally in the first sliding groove 4 .

[0069] Embodiment 7:

[0070] This embodiment provides a multi-channel 3D printing equipment nozzle, which, in addition to the technical solutions of the above embodiments, also has the following technical features: anti-slip grooves are provided on the circumference of the rotating ring 17.

[0071] Among them, the anti-slip grooves provided on the circumference of the rotating ring 17 can increase the friction between the user's hand and the rotating ring 17, making it easier for the user to rotate the rotating ring 17.

[0072] Embodiment 8:

[0073] This embodiment provides a multi-channel 3D printing equipment nozzle, which, in addition to the technical solutions of the above embodiments, also has the following technical features: a sealing sleeve is fixedly connected to the circumference of the through pipe 6.

[0074] In this case, it is ensured that the material will not leak through the gap between the through pipe 6 and the first chute 4 .

[0075] When the inner cavity of the nozzle 3 is blocked and needs to be disassembled for cleaning, the user presses the other end of the two plug blocks 10 by hand, so that the other ends of the two plug blocks 10 respectively drive one end of the two plug blocks 10 from the inner wall of the slot 2 into the two second slide grooves 9 respectively, and make the two plug blocks 10 compress the two springs 11 respectively. At this time, the fixation of the nozzle 3 is released, and then the user can clean and dredge the nozzle 3. When the nozzle 3 is cleaned and dredged, the user inserts the nozzle 3 into the slot 2 by hand, and then the user releases the hand pressing the other end of the two plug blocks 10, so that one end of the two plug blocks 10 is respectively inserted into the inner wall of the slot 2 under the action of the rebound force of the two springs 11, ensuring that the user can quickly remove the nozzle 3. When the user fixes the nozzle 3 in the slot 2, the user turns the swivel 1 by hand. 7, let the rotating ring 17 drive the gear ring 16 to rotate in the annular groove 15, so that the gear ring 16 drives the two gears 13 to rotate in the two rotating grooves 12 respectively. When the two gears 13 rotate, the two gears 13 will respectively drive the two threaded rods 8 to rotate in the slider 5 through the two transmission rods 14, so that the slider 5 is affected by the threads of the two threaded rods 8 and moves upward along the first slide groove 4. When the slider 5 moves upward, the slider 5 will drive the through pipe 6 to move upward in the first slide groove 4, so that the slider 5 can always be connected with the inner cavity of the nozzle 3 through the through pipe 6. At the same time, the slider 5 will also drive the sealing sheet 7 to move upward. When the sealing sheet 7 moves upward to a position where it cannot move, the sealing sheet 7 will be tightly attached to the top surface of the inner wall of the slot 2 to ensure that the material in the nozzle body 1 will not leak.

[0076] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A multi-channel 3D printing equipment nozzle, characterized in that: Including: A nozzle body (1) and a plurality of slots (2). The plurality of slots (2) are opened on the bottom surface of the nozzle body (1), and the inner cavities of the plurality of slots (2) are communicated with the inner cavity of the nozzle body (1). Nozzles (3) are inserted into the slots (2); A plurality of fixing components, which are respectively located in the plurality of nozzles (3) and are used to respectively fix the plurality of nozzles (3) in the plurality of slots (2); A plurality of first chutes (4), which are respectively opened on the top surfaces of the plurality of nozzles (3), and the inner cavities of the plurality of first chutes (4) are respectively communicated with the inner cavities of the plurality of nozzles (3). Sliders (5) are slidably connected in the first chutes (4), and the upper half parts of the sliders (5) extend into the slots (2) and are slidably connected with the slots (2). A through pipe (6) that slides with the first chute (4) is fixedly connected to the bottom surface of the slider (5), and the inner cavity of the through pipe (6) is communicated with the inner cavity of the nozzle (3) and the inner cavity of the slider (5). A sealing piece (7) is fixedly connected to the top surface of the slider (5), and the sealing piece (7) is communicated with the inner cavity of the nozzle body (1) and the inner cavity of the slider (5). Two threaded rods (8) are threadedly connected in the slider (5); A plurality of driving components, which are respectively located in the plurality of nozzles (3) and are used to respectively drive the corresponding two threaded rods (8) to rotate.

2. A multi-channel 3D printing equipment nozzle according to claim 1, characterized in that: The fixing component includes: Two second chutes (9), which are symmetrically opened in the nozzle (3) and are communicated with the inner cavity of the slot (2). Two inserts (10) are respectively slidably connected in the two second chutes (9), and one ends of the two inserts (10) extend to the inner wall of the slot (2) and are inserted and matched with the slot (2). A spring (11) that is fixed to the inner wall of the second chute (9) is fixedly connected to the insert (10).

3. A multi-channel 3D printing equipment nozzle according to claim 2, characterized in that: The insert (10) is in an "匸" shape.

4. A multi-channel 3D printing equipment nozzle according to claim 1, characterized in that: The driving component includes: Two rotating grooves (12), which are symmetrically opened in the nozzle (3) and are communicated with the first chute (4). A gear (13) is rotatably connected in the rotating groove (12). A transmission rod (14) is fixedly connected to the top surface of the gear (13), and one end of the transmission rod (14) extends into the first chute (4) and is fixed to the bottom end of the threaded rod (8); An annular groove (15), which is opened on the periphery of the nozzle (3) and is communicated with the two rotating grooves (12). A toothed ring (16) that meshes with the two gears (13) is rotatably connected in the annular groove (15). A rotating ring (17) is fixedly connected to the periphery of the toothed ring (16), and the rotating ring (17) is located on the periphery of the nozzle (3) and is rotatably connected with the periphery of the nozzle (3).

5. A multi-channel 3D printing equipment nozzle according to claim 4, characterized in that: The transmission rod (14) is located in the rotating groove (12) and is rotatably connected with the rotating groove (12).

6. A multi-channel 3D printing equipment nozzle according to claim 5, characterized in that: One end of the transmission rod (14) is rotatably connected with the first chute (4).

7. A multi-channel 3D printing equipment nozzle according to claim 4, characterized in that: Anti-slip lines are provided on the periphery of the rotating ring (17).

8. The multi-channel 3D printing equipment nozzle according to claim 1, characterized in that: A sealing sleeve is fixedly connected to the periphery of the through pipe (6).

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