Quick-replacement mixing pipe structure with flat nozzle

Abstract

The utility model discloses a quick-replacement mixing pipe structure with a flat nozzle, which relates to the technical field of gluing equipment and comprises a base plate. The glue valve is movably arranged on the base plate; the mixing pipe is mounted at the glue outlet of the glue valve, and the moving direction of the glue valve is the same as the extending direction of the mixing pipe; when the mixing pipe needs to be adjusted or replaced, an operator can manually release the guide rail clamping device, so that the glue valve can drive the mixing pipe to move up and down on the linear guide rail, and when the glue valve moves to the top end of the linear guide rail, the glue valve can move up and down on the linear guide rail. When an operator screws the guide rail clamping device, the mixing pipe is separated from the flat nozzle, and replacement of the mixing pipe is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of glue coating equipment, and more particularly to a quick-detachable mixing tube structure with a flat nozzle. Background Art

[0002] With the continuous evolution and innovation of glue coating process performance requirements, the connection and matching of mixers and flat nozzles have become more diverse. In particular, to address the sealing issues between customized metal flat nozzles and mixers, and the direct impact of the flat nozzle's glue discharge height on the glue pattern formation, more stringent specifications have been put forward for the height accuracy of the flat nozzle.

[0003] To ensure accurate positioning of the flat nozzle, the structural design of the mixer with a flat nozzle must achieve a high degree of reliability. However, this requirement also increases the complexity of the replacement process between the mixer and the flat nozzle, prolonging the time required to replace the mixer, thereby posing a challenge to the smoothness of the production process and affecting the continuous operation and stability of the production line. In addition, improper operation during the replacement process may cause seal failure and lead to glue leakage.

[0004] In summary, how to achieve rapid and efficient removal and replacement of mixing tubes to improve production efficiency and process stability is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a quick-disassembly and replacement mixing tube structure with a flat nozzle, which effectively improves the disassembly and replacement efficiency of the mixing tube, and enhances the production efficiency and the stability of the disassembly and replacement process.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A quick-disconnect mixing tube structure with a flat nozzle, comprising:

[0008] substrate;

[0009] a glue valve movably mounted on the substrate;

[0010] A mixing tube is installed at the glue outlet of the glue valve, and the moving direction of the glue valve is the same as the extending direction of the mixing tube;

[0011] The flat mouth is detachably mounted on the base plate and is located at the lower end of the mixing tube in the extending direction.

[0012] Preferably, a linear guide rail is laid on the substrate, and a movable platform cooperating with the linear guide rail is provided on the side of the glue valve facing the substrate. A guide rail clamp is installed on the movable platform, and the guide rail clamp is used to unlock and fix between the movable platform and the linear guide rail.

[0013] Preferably, two groups of the linear guide rails and the guide rail clamps are provided, the movable platform is slidably mounted on the two groups of the linear guide rails, and the two groups of the guide rail clamps are respectively provided on the left and right sides of the movable platform.

[0014] Preferably, it also includes:

[0015] A fixed bracket is installed on the rubber valve;

[0016] A clamping portion is mounted on the fixing bracket, and the clamping portion is formed with a clamping hole;

[0017] The sheath is inserted into the clamping hole and is sleeved on the outer side of the mixing tube.

[0018] Preferably, the clamping portion includes two clamping jaws arranged opposite to each other, the clamping hole is formed between the two clamping jaws, and one of the clamping jaws is configured to be movable toward or away from the other clamping jaw.

[0019] Preferably, a support frame is fixedly connected to the base plate, a positioning and fixing clamp is installed on the support frame, and the flat mouth is detachably installed on the positioning and fixing clamp.

[0020] Preferably, the positioning and fixing clamp includes:

[0021] A fixing portion, mounted on the support frame;

[0022] a disassembly portion, disposed on one side of the fixing portion, wherein the disassembly portion and the fixing portion are respectively provided with connecting mounting holes;

[0023] a first fastener, screwed into the mounting hole to detachably connect the fixing portion and the detachable portion;

[0024] The fixing portion and the disassembling portion are respectively provided with mounting cavities on opposite sides thereof, and the flat mouth portion is fixed in the mounting cavity.

[0025] Preferably, a waist-shaped hole is provided on the support frame, a second fastener is provided in the waist-shaped hole, the support frame is connected to the fixed part through the second fastener, the extension direction of the waist-shaped hole is the same as the extension direction of the mixing tube, and the second fastener can move along the extension direction of the waist-shaped hole.

[0026] Preferably, the flat mouth comprises:

[0027] Part I;

[0028] The second part is provided on one side of the first part and is spliced ​​with the first part, and the splicing surface is the central surface of the flat mouth;

[0029] a positioning post, disposed on the first portion;

[0030] The positioning seat is arranged on the second part and matched with the positioning column.

[0031] Preferably, the flat mouth has a connecting opening, the outlet end of the mixing tube can extend into the connecting opening, a sealing ring is provided in the connecting opening, and the sealing ring is arranged on the outside of the mixing tube extending into the connecting opening.

[0032] The utility model provides a quick-detachable mixing tube structure with a flat nozzle, which includes a base plate; a glue valve movably mounted on the base plate; a mixing tube installed at the glue outlet of the glue valve, and the moving direction of the glue valve is the same as the extension direction of the mixing tube; and a flat nozzle detachably mounted on the base plate and located at the lower end of the mixing tube in the extension direction.

[0033] This utility model provides a quick-release mixer with a flat nozzle. The mixer with a valve structure is installed from below. The sheath uses a fixed bracket to accurately position the mixer. The linear guide rail ensures accurate docking between the mixer and the flat nozzle. When the mixer needs to be adjusted or replaced, the operator manually releases the guide rail clamp, allowing the valve to move the mixer up and down on the linear guide rail. When the valve moves to the top of the linear guide rail, the operator tightens the guide rail clamp, separating the mixer from the flat nozzle, making it easier to replace the mixer. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0035] Figure 1 It is a three-dimensional structural diagram of a quick-release mixing tube with a flat nozzle;

[0036] Figure 2 This is a side view of the structure of a quick-release mixing tube with a flat nozzle;

[0037] Figure 3 This is a partial exploded structural diagram of a quick-release mixing tube with a flat nozzle;

[0038] Figure 4 It is a side cross-sectional structural diagram of a quick-release mixing tube with a flat nozzle.

[0039] Figure 1-Figure 4 , the reference numerals include:

[0040] 1. Substrate; 2. Glue valve; 3. Mixing tube;

[0041] 4. Flat mouth; 41. First part; 42. Second part; 43. Positioning column; 44. Positioning seat; 45. Connecting port;

[0042] 5. Linear guide rail; 6. Moving platform; 7. Guide rail clamp; 8. Fixed bracket;

[0043] 9. Clamping portion; 91. Clamping claw;

[0044] 10. Sheath; 11. Support frame;

[0045] 12. Positioning and fixing clip; 121. Fixing portion; 122. Disassembly portion; 123. First fastener;

[0046] 13. Waist-shaped hole; 14. Second fastener; 15. Sealing ring. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0048] Unless otherwise defined, the technical terms or scientific terms used in this application shall have the usual meanings understood by persons of ordinary skill in the field to which this invention belongs. "First", "second" and similar words used in this application do not indicate any order, quantity or importance. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly. The embodiment of this application discloses a quick-release mixing tube structure with a flat nozzle.

[0049] The core of the utility model is to provide a quick-disconnect and replaceable mixing tube structure with a flat nozzle.

[0050] Please refer to Figures 1 to 4 The utility model provides a quick-disconnect mixing tube structure with a flat nozzle, which includes:

[0051] substrate1;

[0052] The glue valve 2 is movably mounted on the substrate 1;

[0053] The mixing tube 3 is installed at the glue outlet of the glue valve 2, and the moving direction of the glue valve 2 is the same as the extending direction of the mixing tube 3;

[0054] The flat nozzle 4 is detachably mounted on the base plate 1 and is located at the lower end of the mixing tube 3 in the extending direction.

[0055] Specifically, base plate 1 is a thin square plate that supports the glue valve 2 and flat nozzle 4. The glue valve 2, mixing tube 3, and flat nozzle 4 are designed to work together. During operation, at least two colloids are added to the glue valve 2, thoroughly mixed, and then flow through the mixing tube 3 to the flat nozzle, where they are ultimately applied to the desired location. Vertically, the glue valve 2, mixing tube 3, and flat nozzle 4 are arranged in order from top to bottom. The glue valve 2 is configured to move along the base plate 1 along the extension of the mixing tube 3, allowing the glue valve 2 to move the mixing tube 3 toward or away from the flat nozzle 4, thereby connecting or disconnecting the two.

[0056] The above-mentioned quick-disconnect and replaceable mixing tube structure with a flat nozzle, by setting the glue valve 2 to be movable, during operation, the mixing tube 3 and the flat nozzle 4 remain connected for gluing. When the mixing tube 3 needs to be replaced, the glue valve 2 can be moved upward to separate the mixing tube 3 from the flat nozzle, thereby facilitating disassembly and replacement, effectively solving the problems of low disassembly efficiency of the mixing tube 3 and poor stability during the disassembly and replacement process.

[0057] The quick-disconnect and replaceable mixing tube structure with a flat nozzle provided by the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0058] Based on any of the above embodiments, Figure 2 A linear guide rail 5 is laid on the substrate 1, and a movable platform 6 that cooperates with the linear guide rail 5 is provided on the side of the glue valve 2 facing the substrate 1. A guide rail clamp 7 is installed on the movable platform 6, and the guide rail clamp 7 is used to unlock and fix between the movable platform 6 and the linear guide rail 5.

[0059] Specifically, the linear guide rail 5 is laid on the base plate 1 in a long rectangular structure, and its length is aligned with the extension direction of the mixing tube 3. The movable platform 6 has a mating surface and a mounting surface. The mating surface is formed with a slide groove that mates with the linear guide rail 5, allowing the movable platform 6 to slide relative to the linear guide rail 5; the mounting surface provides a mounting space for the glue valve 2.

[0060] The guide rail clamp 7 is mounted on the movable platform 6. The specific structure of the guide rail clamp 7 is well known and will not be described in detail here. The guide rail clamp 7 can be used to fix the movable platform 6 on the linear guide rail 5 or to unlock the movable platform 6 from the linear guide rail 5, allowing the movable platform 6 to move along the linear guide rail 5. When the glue is being applied, the movable platform 6 is in a fixed state. When the mixing tube 3 needs to be removed or replaced, the movable platform 6 is unlocked.

[0061] Based on any of the above embodiments, Figure 1 There are two groups of linear guide rails 5 and two groups of guide rail clamps 7. The movable platform 6 is slidably mounted on the two groups of linear guide rails 5. The two groups of guide rail clamps 7 are respectively arranged on the left and right sides of the movable platform 6.

[0062] Specifically, the main body of the movable platform 6 is configured as a plate-like structure parallel to the base plate 1. Corresponding to the two sets of linear guide rails 5, two slide grooves are provided on the movable platform 6. The two slide grooves are preferably provided on the left and right sides of the movable platform 6 to improve its overall stability. The two sets of guide rail clamps 7 are respectively matched with the two sets of linear guide rails 5. When unlocking or fixing the movable platform 6 and the linear guide rails 5, the operator controls the two sets of guide rail clamps 7 at the same time to improve stability.

[0063] Based on any of the above embodiments, Figure 1 The quick-disconnect mixing tube structure with a flat nozzle also includes:

[0064] A fixed bracket 8 is installed on the glue valve 2;

[0065] A clamping portion 9 is mounted on the fixing bracket 8, and the clamping portion 9 is formed with a clamping hole;

[0066] The sheath 10 is passed through the clamping hole and sleeved on the outer side of the mixing tube 3 .

[0067] Specifically, the fixing bracket 8 is an L-shaped plate structure, the horizontal portion of the fixing bracket 8 is installed on the lower surface of the rubber valve 2, and the vertical portion extends downward of the rubber valve 2, and the extending direction is the same as the extending direction of the mixing tube 3.

[0068] The clamping portion 9 is provided at the lower end of the vertical portion of the fixing bracket 8. The sheath 10 passes through the clamping hole and is clamped in place by the clamping portion 9. The sheath 10 is a hollow tubular structure with openings at both ends, allowing the mixing tube 3 to pass through the sheath 10. The sheath 10 protects the mixing tube 3 and also guides and positions the mixing tube 3.

[0069] Based on any of the above embodiments, Figure 1 The clamping portion 9 includes two oppositely disposed clamping jaws 91 , the clamping hole is formed between the two clamping jaws 91 , and one of the clamping jaws 91 is configured to be movable toward or away from the other clamping jaw 91 .

[0070] Specifically, the opposite sides of the two clamping jaws 91 are set to be arc-shaped and compatible with the outer surface of the sheath 10. When the two clamping jaws 91 are closest, the two arcs are connected to form a circular clamping hole. When one of the clamping jaws 91 is away from the other clamping jaw 91, the clamping hole is opened to facilitate replacement.

[0071] It should be noted that in this embodiment, one clamping jaw 91 can be moved closer to or further away from the other clamping jaw 91 by various means, such as rotation or translation. For example, one clamping jaw 91 can be rotatably connected to the fixed bracket 8 so that it can rotate toward or away from the other clamping jaw 91 to open or close the clamping hole. Alternatively, one clamping jaw 91 can be slidably connected to the fixed bracket 8 so that it can translate toward or away from the other clamping jaw 91 to open or close the clamping hole. The specific connection structure is common knowledge and will not be described in detail here.

[0072] Based on any of the above embodiments, Figure 2 A support frame 11 is fixedly connected to the base plate 1 , a positioning and fixing clamp 12 is installed on the support frame 11 , and the flat mouth 4 is detachably installed on the positioning and fixing clamp 12 .

[0073] Specifically, the support frame 11 is also configured as an L-shaped structure, and its horizontal part is connected to the base plate 1. It can be understood that in order to prevent the support frame 11 from obstructing the movement of the glue valve 2, the connection position between the support and the base plate 1 should be set below the linear guide rail 5; the vertical part of the support frame 11 extends downward along the extension direction of the mixing tube 3, and the above-mentioned positioning and fixing clamp 12 is arranged at the lower end of the vertical part of the support frame 11, and the flat mouth 4 is fixed to the support frame 11 by the positioning and fixing clamp 12.

[0074] Based on any of the above embodiments, Figure 3 , the positioning and fixing clip 12 includes:

[0075] The fixing portion 121 is mounted on the support frame 11;

[0076] The disassembly portion 122 is provided on one side of the fixing portion 121, and the disassembly portion 122 and the fixing portion 121 are respectively provided with connecting mounting holes;

[0077] A first fastener 123 is screwed into the mounting hole to detachably connect the fixing portion 121 and the detachable portion 122;

[0078] The fixing portion 121 and the disassembly portion 122 have opposite sides respectively formed with mounting cavities, and the flat mouth 4 is partially fixed in the mounting cavities.

[0079] Specifically, the fixing part 121 is a square block structure, one end of which is mounted on the support frame 11 and the other end extends horizontally. The disassembly part 122 cooperates with the fixing part 121. When the two are in a connected state, the mounting holes opened on the two are connected to form a space for fixing the flat mouth 4. When the flat mouth 4 is placed in the space, it is clamped by the disassembly part 122 and the fixing part 121, thereby achieving fixation.

[0080] The mounting hole may be a threaded hole, and the first fastener 123 is correspondingly configured as a fastening bolt.

[0081] It is understandable that, in order to improve the fixing effect of the flat mouth 4, the fixing portion 121 and the disassembly portion 122 can be specially designed according to the shape of the flat mouth 4 to form a clamping structure.

[0082] Based on any of the above embodiments, Figure 3 A waist-shaped hole 13 is provided on the support frame 11, and a second fastener 14 is provided in the waist-shaped hole 13. The support frame 11 is connected to the fixing portion 121 through the second fastener 14. The extension direction of the waist-shaped hole 13 is the same as the extension direction of the mixing tube 3, and the second fastener 14 can move along the extension direction of the waist-shaped hole 13.

[0083] Specifically, the second fastener 14 is configured to move along the extension direction of the waist-shaped hole 13, allowing fine-tuning of the height of the positioning bracket. To adjust, first loosen the second fastener 14 to allow the positioning clamp 12 to move, adjust the positioning clamp 12 to the desired position, and then tighten the second fastener 14 to complete the adjustment. Similarly, the second fastener 14 can be configured as a fastening bolt, with the fixing portion 121 having a corresponding threaded hole on the side facing the support frame 11 to connect the two.

[0084] Based on any of the above embodiments, Figure 3 and Figure 4 , the flat mouth 4 includes:

[0085] Part I 41;

[0086] The second portion 42 is provided on one side of the first portion 41 and is spliced ​​with the first portion 41 , and the splicing surface is the central surface of the flat mouth 4;

[0087] A positioning post 43 is provided on the first portion 41;

[0088] The positioning seat 44 is disposed on the second portion 42 and cooperates with the positioning post 43 .

[0089] Specifically, the flat mouth 4 is divided into a first part 41 and a second part 42 from the center surface. When the two are spliced, the positioning column 43 is inserted into the positioning seat 44 to determine the installation position of the first part 41 and the second part 42, while improving the connection stability of the first part 41 and the second part 42.

[0090] In addition, the clamping force exerted on the flat mouth 4 by the cooperation between the fixing portion 121 and the disassembly portion 122 can make the first part 41 and the second part 42 fit tightly together.

[0091] Based on any of the above embodiments, Figure 4 The flat mouth 4 has a connecting port 45, and the outlet end of the mixing tube 3 can extend into the connecting port 45. A sealing ring 15 is provided in the connecting port 45, and the sealing ring 15 is arranged on the outside of the mixing tube 3 extending into the connecting port 45.

[0092] Specifically, the end of the flat nozzle 4 close to the mixing tube 3 is set as a cylindrical tubular structure, and the connecting port 45 is formed at the cylindrical tube. The inner diameter of the cylindrical tube is slightly larger than the outer diameter of the glue outlet end of the mixing tube 3, so that the mixing tube 3 can be inserted into the flat nozzle 4. At this time, the sealing ring 15 is arranged between the mixing tube 3 and the connecting port 45 to play a sealing role to prevent the glue from overflowing from between the connecting port 45 and the mixing tube 3.

[0093] A glue cavity is also formed in the flat nozzle 4, which is connected to the bottom of the connecting port 45. The glue flowing out of the mixing tube 3 enters the glue cavity, flows further downward, and finally flows out from the two flat nozzles for coating.

[0094] The implementation principle of a quick-disconnect and replaceable mixing tube structure with a flat nozzle in an embodiment of the present application is as follows: when the mixing tube 3 needs to be replaced, the operator controls the guide rail clamp 7 to unlock the movable platform 6 and the linear guide rail 5, and then pushes the glue valve 2, the sheath 10, the fixed bracket 8 and the mixing tube 3 and other components to move upward synchronously, so that the mixing tube 3 is separated from the flat nozzle 4. After separation, the guide rail clamp 7 is operated again to fix the position of the movable platform 6, and then the sheath 10 and the mixing tube 3 can be removed, and the mixing tube 3 can be replaced and reinstalled on the glue valve 2, and then the guide rail clamp 7 is operated to unlock the movable platform 6, so that the movable platform 6 and the glue valve 2 and other components move downward along the linear guide rail 5, and the glue outlet end of the mixing tube 3 is re-extended into the connecting port 45 to complete the connection, and finally the guide rail clamp 7 is operated to fix the position of the movable platform 6, and then the gluing action is performed again.

[0095] The above is a detailed introduction to the quick-release mixing tube structure with a flat nozzle provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core concept of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A quick-release mixing tube structure with a flat nozzle, characterized in that: include: substrate(1); A glue valve (2) is movably mounted on the substrate (1); A mixing tube (3) is installed at the glue outlet of the glue valve (2), and the moving direction of the glue valve (2) is the same as the extending direction of the mixing tube (3); The flat nozzle (4) is detachably mounted on the base plate (1) and is located at the lower end of the mixing tube (3) in the extension direction.

2. A quick-release mixing tube structure with a flat nozzle according to claim 1, characterized in that: A linear guide rail (5) is laid on the substrate (1); a movable platform (6) that cooperates with the linear guide rail (5) is provided on the side of the glue valve (2) facing the substrate (1); a guide rail clamp (7) is installed on the movable platform (6); and the guide rail clamp (7) is used for unlocking and fixing between the movable platform (6) and the linear guide rail (5).

3. A quick-release mixing tube structure with a flat nozzle according to claim 2, characterized in that: The linear guide rails (5) and the guide rail clamps (7) are both provided in two groups, the movable platform (6) is slidably mounted on the two groups of the linear guide rails (5), and the two groups of the guide rail clamps (7) are respectively provided on the left and right sides of the movable platform (6).

4. The quick-release mixing tube structure with a flat nozzle according to claim 1, characterized in that: Also includes: A fixed bracket (8) is mounted on the rubber valve (2); A clamping portion (9) is mounted on the fixing bracket (8), and a clamping hole is formed on the clamping portion (9); The sheath (10) is inserted into the clamping hole, and the sheath (10) is sleeved on the outside of the mixing tube (3).

5. A quick-release mixing tube structure with a flat nozzle according to claim 4, characterized in that: The clamping portion (9) comprises two clamping jaws (91) arranged opposite to each other, the clamping hole is formed between the two clamping jaws (91), and one of the clamping jaws (91) is configured to be movable in a direction close to or away from the other clamping jaw (91).

6. The quick-release mixing tube structure with a flat nozzle according to claim 1, characterized in that: A support frame (11) is fixedly connected to the base plate (1), a positioning and fixing clamp (12) is installed on the support frame (11), and the flat mouth (4) is detachably installed on the positioning and fixing clamp (12).

7. A quick-release mixing tube structure with a flat nozzle according to claim 6, characterized in that: The positioning and fixing clip (12) comprises: A fixing portion (121) is mounted on the support frame (11); A disassembly portion (122) is provided on one side of the fixing portion (121), and communicating mounting holes are respectively provided on the disassembly portion (122) and the fixing portion (121); A first fastener (123) is screwed into the mounting hole to detachably connect the fixing portion (121) and the detachable portion (122); The fixing portion (121) and the disassembly portion (122) are respectively provided with mounting cavities on opposite sides thereof, and the flat mouth (4) is partially fixed in the mounting cavity.

8. A quick-release mixing tube structure with a flat nozzle according to claim 7, characterized in that: The support frame (11) is provided with a waist-shaped hole (13), a second fastener (14) is provided in the waist-shaped hole (13), the support frame (11) is connected to the fixing portion (121) via the second fastener (14), the extension direction of the waist-shaped hole (13) is the same as the extension direction of the mixing tube (3), and the second fastener (14) can move along the extension direction of the waist-shaped hole (13).

9. A quick-release mixing tube structure with a flat nozzle according to any one of claims 1 to 8, characterized in that: The flat mouth (4) comprises: Part I (41); A second part (42) is provided on one side of the first part (41) and is spliced ​​with the first part (41), and the splicing surface is the central surface of the flat mouth (4); A positioning column (43) is provided on the first portion (41); A positioning seat (44) is disposed on the second portion (42) and cooperates with the positioning column (43).

10. A quick-release mixing tube structure with a flat nozzle according to claim 9, characterized in that: The flat mouth (4) has a connecting opening (45), and the outlet end of the mixing tube (3) can extend into the connecting opening (45). A sealing ring (15) is provided in the connecting opening (45), and the sealing ring (15) is arranged around the outside of the mixing tube (3) extending into the connecting opening (45).

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