Glue preparation machine capable of automatically mixing liquid and premixing mechanism for glue preparation machine

By using an elastic premixer and a vibrating regulating rod to adjust the flow channel cross-section in the mixing equipment, the problem of low liquid mixing efficiency in the prior art is solved, achieving faster mixing and uniformity, and improving mixing efficiency.

CN223628497UActive Publication Date: 2025-12-05ZHIXIN BOYUAN (ANHUI) NEW MATERIAL TECH CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202520224614.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-13
Publication Date
2025-12-05
Estimated Expiration
2035-02-13

AI Technical Summary

Technical Problem

Existing mixing equipment is inefficient when mixing multiple liquids because the raw materials entering the tank later are not mixed evenly with the previous raw materials, resulting in long mixing time and low efficiency.

Method used

The automatic liquid mixing machine utilizes a premixer with an elastic setting and an elastic adjusting rod to accelerate liquid mixing through vibration. When the premixer receives liquid, it vibrates due to the impact force, adjusting the flow cross section of the premix channel and promoting liquid mixing.

Benefits of technology

It improves the efficiency of liquid mixing, shortens the mixing time, and enhances mixing uniformity and efficiency.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN223628497U_ABST
    Figure CN223628497U_ABST
Patent Text Reader

Abstract

The utility model belongs to the technical field of mixing, and particularly relates to a glue preparation machine capable of automatically mixing liquid and a premixing mechanism for the glue preparation machine. Each liquid conveying assembly comprises a diaphragm pump and an anti-static hose, and the diaphragm pumps are suitable for conveying liquid in the corresponding raw material barrels to the glue mixing tank through the anti-static hoses; the premixing mechanism is arranged in the glue mixing tank and comprises an elastically arranged premixer, a premixing flow channel is formed in the premixer, a plurality of elastic adjusting rods are inserted into the premixer, one end of each elastic adjusting rod extends into the premixing flow channel, and the other end of each elastic adjusting rod protrudes out of the premixer; according to the glue preparation machine capable of automatically mixing the liquid, the premixer is elastically arranged, so that the premixer vibrates due to the impact force in the process of receiving the raw materials, and the vibration can accelerate the mixing of the liquids in the premixing runner.
Need to check novelty before this filing date? Find Prior Art

Description

TECHNICAL FIELD

[0001] The utility model belongs to the mixed technical field, concretely relates to mixing equipment, especially relates to a glue mixing machine of automatic mixing liquid and premixing mechanism thereof. BACKGROUND

[0002] At present, most of the glue mixing equipment on the market transports and configures multiple liquids, generally uses multiple pump bodies to transport corresponding raw materials into a barrel, and then uses a stirrer in the barrel to stir and mix the liquids.

[0003] However, this mixing method requires a long time for the raw materials entering the barrel later to be uniformly mixed with the previous raw materials, resulting in low efficiency.

[0004] Therefore, how to solve the technical problem of low efficiency caused by directly transporting multiple raw materials into a barrel for stirring and mixing is an urgent problem for those skilled in the art.

[0005] It should be noted that the above information disclosed in the background section of the present application is only used to understand the background technology of the present application, and therefore, the above description is not considered to constitute prior art information. CONTENT OF THE UTILITY MODEL

[0006] The present disclosure provides at least a glue mixing machine for automatically mixing liquids and a premixing mechanism thereof.

[0007] In a first aspect, the present disclosure provides a glue mixing machine for automatically mixing liquids, comprising: a glue mixing tank; a plurality of liquid delivery assemblies, each comprising: a diaphragm pump and an anti-static hose, the diaphragm pump being adapted to deliver the liquid in the corresponding raw material barrel to the glue mixing tank through the anti-static hose; and a premixing mechanism arranged in the glue mixing tank, comprising: an elastically arranged pre-mixer, a premixing flow channel being formed in the pre-mixer, and a plurality of elastic adjusting rods being inserted into the pre-mixer, one end of each elastic adjusting rod extending into the premixing flow channel and the other end protruding from the pre-mixer; wherein the pre-mixer is adapted to vibrate when receiving the liquid delivered by each diaphragm pump due to the impact force, and the corresponding elastic adjusting rod is pressed to adjust the flow cross section of the corresponding area of the premixing flow channel through the vibration.

[0008] In an alternative embodiment, the premixing flow channel is spiral-shaped; wherein the inlet and outlet of the premixing flow channel are both located in the middle part of the pre-mixer.

[0009] In an alternative embodiment, the premixing mechanism further comprises: a mounting plate and a first spring set; wherein both sides of the pre-mixer are provided with an adapter plate; the first spring set is arranged on the mounting plate and supports the pre-mixer by abutting against the two adapter plates.

[0010] In an alternative embodiment, the elastic adjusting rod comprises a rod body and a second spring; wherein the upper end of the rod body extends into the premixing flow channel, and the end is provided with a piston; the middle part of the rod body is provided with an annular boss; the second spring is sleeved on the rod body, and one end thereof abuts against the premixer, and the other end thereof abuts against the annular boss.

[0011] In an alternative embodiment, a gap is left between the lower end of the rod body and the mounting plate when the premixer does not receive liquid.

[0012] In an alternative embodiment, a pair of equal-height blocks are arranged on the mounting plate; wherein the two equal-height blocks are respectively located below the corresponding receiving plates.

[0013] In an alternative embodiment, a plurality of recesses are formed in the side wall of the premixing flow channel; wherein the piston of the elastic adjusting rod is arranged in the recess when the premixer does not receive liquid.

[0014] In a second aspect, the embodiments of the present disclosure further provide a premixing mechanism for a glue dispensing machine for automatically mixing liquid, comprising: a premixer arranged elastically, both sides of which are provided with a receiving plate; a mounting plate, on which a pair of equal-height blocks are arranged, and the two equal-height blocks are respectively located below the corresponding receiving plates; and a first spring group; wherein the first spring group is arranged on the mounting plate, and supports the premixer by abutting against the two receiving plates.

[0015] In an alternative embodiment, a premixing flow channel is formed in the premixer, and a plurality of elastic adjusting rods are inserted into the premixer; one end of the elastic adjusting rod extends into the premixing flow channel, and the other end thereof protrudes out of the premixer.

[0016] In an alternative embodiment, the elastic adjusting rod comprises a rod body and a second spring; wherein the upper end of the rod body extends into the premixing flow channel, and the end is provided with a piston; the middle part of the rod body is provided with an annular boss; the second spring is sleeved on the rod body, and one end thereof abuts against the premixer, and the other end thereof abuts against the annular boss.

[0017] The premixer is arranged elastically, so that the premixer vibrates due to the impact force during the process of receiving raw materials; the vibration not only accelerates the mixing of the liquids in the premixing flow channel, but also drives the elastic adjusting rod on the premixer to vibrate, so that the elastic adjusting rod is pressed to extend into the premixing flow channel, thereby adjusting the flow cross section of the premixing flow channel in the region, and accelerating the mixing of the liquid and the end of the elastic adjusting rod.

[0018] The other features and advantages of the present application will be described in the following description and become apparent from the description, or can be learned from practice of the present application. The objectives and other advantages of the present application can be achieved and obtained by the structure particularly pointed out in the description and the accompanying drawings.

[0019] In order to make the above objectives, features and advantages of the present application more apparent, preferred embodiments are described in detail hereinafter, and the accompanying drawings are described, and detailed description is made as follows. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings required to be used in the specific embodiments or the prior art description will be briefly introduced hereinafter. Obviously, the drawings described hereinafter are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 A top view structural schematic diagram of a glue mixing machine for automatically mixing liquid provided by the embodiment of the present disclosure;

[0022] Figure 2 A structural schematic diagram of a glue mixing tank provided by the embodiment of the present disclosure;

[0023] Figure 3 A sectional view structural schematic diagram of a premixing mechanism provided by the embodiment of the present disclosure;

[0024] Figure 4 A structural schematic diagram of a premixing flow channel provided by the embodiment of the present disclosure;

[0025] Figure 5 A three-dimensional structural schematic diagram of a premixing mechanism provided by the embodiment of the present disclosure.

[0026] In the drawings:

[0027] Glue mixing tank 10, raw material barrel 11;

[0028] Multiple infusion assemblies 2, diaphragm pump 21, anti-static hose 22;

[0029] Premixing mechanism 3, mounting plate 301, isometric block 302, premixer 31, receiving plate 311, premixing flow channel 32, inflow port 321, outflow port 322, recess 323, elastic adjusting rod 33, rod body 331, second spring 332, piston 333, annular boss 334, first spring set 34. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the figures, the thickness of parts may be exaggerated or reduced for the purpose of effectively depicting the technical content.

[0032] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0033] like Figures 1 to 2 As shown, at least one embodiment provides an automatic liquid mixing machine, including: a mixing tank 10 and a plurality of infusion components 2, and a premixing mechanism 3 disposed in the mixing tank 10; wherein, the liquid in the raw material tank 11 is transported to the premixing mechanism 3 in the mixing tank 10 through the infusion components 2.

[0034] In this embodiment, a premixing mechanism 3 is provided in the mixing tank 10. The premixing mechanism 3 receives the liquids delivered by each diaphragm pump 21, thereby premixing each liquid before it is delivered to the mixing tank 10 for stirring and mixing. Since the raw materials entering the mixing tank 10 later have also been mixed by the premixing mechanism 3, they can be mixed with the raw materials in the mixing tank 10 more quickly, which greatly improves the mixing efficiency.

[0035] like Figure 1 As shown, in some embodiments, the infusion assembly 2 includes a diaphragm pump 21 and an antistatic hose 22. One end of the diaphragm pump 21 is connected to the raw material tank 11 through the antistatic hose 22, and the other end is connected to the premixing mechanism 3 through the antistatic hose 22, thereby conveying the liquid in the raw material tank 11 to the premixing mechanism 3.

[0036] like Figure 3 As shown, in some embodiments, the premixing mechanism 3 includes: a premixer 31 that is elastically configured, a premixing channel 32 that is provided in the premixer 31, and a plurality of elastic adjusting rods 33 inserted on the premixer 31, one end of the elastic adjusting rod 33 extending into the premixing channel 32 and the other end protruding out of the premixer 31.

[0037] In the embodiment, the premixer 31 is elastically arranged so that it vibrates when it receives the raw materials, which not only accelerates the mixing of the liquids in the premixing flow channel 32, but also makes the elastic adjusting rod 33 on the premixer 31 vibrate, so that the elastic adjusting rod 33 is pressed to extend into the premixing flow channel 32, thereby adjusting the flow cross section of the premixing flow channel 32 in the region, so that the liquids collide with the end of the elastic adjusting rod 33 to accelerate the mixing.

[0038] As shown in Figure 4 some embodiments, the premixing flow channel 32 is spiral-shaped; wherein the inflow port 321 and the outflow port 322 of the premixing flow channel 32 are both located in the middle of the premixer 31.

[0039] In the embodiment, the inflow port 321 and the outflow port 322 are arranged in the middle of the premixer 31, so that the inclination rate of the premixer 31 is as low as possible when it is lifted by force.

[0040] As shown in Figure 3 some embodiments, the premixing mechanism 3 further comprises a mounting plate 301 and a first spring set 34; wherein both sides of the premixer 31 are provided with a receiving plate 311; the first spring set 34 is arranged on the mounting plate 301 and supports the premixer 31 by abutting against the two receiving plates 311.

[0041] In the embodiment, the premixer 31 is supported by the first spring set 34, so that it vibrates when it is subjected to force.

[0042] As shown in Figure 3 some embodiments, the elastic adjusting rod 33 comprises a rod body 331 and a second spring 332; wherein the upper end of the rod body 331 extends into the premixing flow channel 32, and the end is provided with a piston 333; the middle part of the rod body 331 is provided with an annular boss 334; the second spring 332 is sleeved on the rod body 331, and one end thereof abuts against the premixer 31 and the other end thereof abuts against the annular boss 334.

[0043] In the embodiment, when the outer end of the rod body 331 is subjected to force, the piston 333 is lifted in the premixing flow channel 32, thereby blocking the flow of the liquids, so that the liquids are accelerated by collision; when the outer end of the rod body 331 is not subjected to force, the second spring 332 drives the piston 333 on the rod body 331 to move back to the original position, and the presence of the piston 333 also prevents the rod body 331 from being separated from the premixer 31.

[0044] As shown in Figure 3 some embodiments, when the premixer 31 does not receive the liquids, a gap is left between the lower end of the rod body 331 and the mounting plate 301.

[0045] AsFigure 5 As shown in some embodiments, a pair of equal-height blocks 302 are arranged on the mounting plate 301; wherein the two equal-height blocks 302 are respectively located below the corresponding receiving plates 311.

[0046] In the present embodiment, the equal-height blocks 302 serve to block the premixing flow channel 32 when the piston 333 extends too much.

[0047] As shown in some embodiments, the side wall of the premixing flow channel 32 is provided with a plurality of recesses 323; wherein the piston 333 of the elastic adjusting rod 33 is arranged in the recess 323 when the liquid is not received by the premixer 31. Figure 3

[0048] In the present embodiment, the recesses 323 serve to accommodate the piston 333.

[0049] At least one embodiment also provides a premixing mechanism for an automatic liquid mixing glue dispensing machine, comprising: an elastically arranged premixer 31, both sides of which are provided with a receiving plate 311; a mounting plate 301, on which a pair of equal-height blocks 302 are arranged, and the two equal-height blocks 302 are respectively located below the corresponding receiving plates 311; and a first spring set 34; wherein the first spring set 34 is arranged on the mounting plate 301 and supports the premixer 31 by abutting against the two receiving plates 311.

[0050] In some embodiments, the premixer 31 is provided with a premixing flow channel 32, and a plurality of elastic adjusting rods 33 are inserted into the premixer 31, one end of each elastic adjusting rod 33 extends into the premixing flow channel 32, and the other end protrudes out of the premixer 31.

[0051] In some embodiments, the elastic adjusting rod 33 comprises: a rod body 331, and a second spring 332; wherein the upper end of the rod body 331 extends into the premixing flow channel 32, and the end is provided with a piston 333; the middle part of the rod body 331 is provided with an annular boss 334; and the second spring 332 is sleeved on the rod body 331, one end of the second spring 332 abuts against the premixer 31, and the other end abuts against the annular boss 334.

[0052] In summary, the automatic liquid mixing glue dispensing machine and the premixing mechanism thereof are elastically arranged by the premixer 31, so that the premixer 31 will vibrate due to the impact force during the process of receiving raw materials. This vibration not only accelerates the mixing of the liquids in the premixing flow channel 32, but also drives the elastic adjusting rod 33 on the premixer 31 to vibrate, so that the elastic adjusting rod 33 is pressed to extend into the premixing flow channel 32, thereby adjusting the flow cross section of the premixing flow channel 32 in this area, so that the liquid collides with the end of the elastic adjusting rod 33 to accelerate the mixing.

[0053] ​In this document, when a first component is referred to as being "on" a second component, it can be directly on the second component or intervening components can be present. In contrast, when a first component is referred to as being "directly on" a second component, there are no intervening components present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0054] In this document, when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer, or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on" another element or layer, there are no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0055] In this document, example embodiments of the disclosure are described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of," when preceding a list of two or more items, modify the entire list of items and do not modify the individual items of the list. For example, the expression "at least one of a, b, and c" should be understood as including only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0056] The terminology used herein is for the purpose of describing particular example configurations only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," and "including" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order

[0057] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” and the like generally mean the particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of the present disclosure. Thus, appearances of such phrases in various places throughout this specification do not necessarily all refer to the same embodiment. As used herein, the terms “example,” “exemplary,” and the like are used as example, instance, or illustration. Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or advantageous over other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” and the like are intended to present concepts in a concrete manner.

[0058] In the description of the embodiments of the present application, unless specifically defined and limited, the terms “mounting”, “connection”, “connecting” should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, and can be internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0059] In the description of the present application, it should be explained that the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer” and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, terms such as “first”, “second” and other numerical terms are used herein without implying a sequence or order unless the context clearly indicates otherwise. Therefore, the first element, component, region, layer or section discussed above can be referred to as the second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0060] Spatially relative terms, such as "inner," "outer," "beneath," "below," "lower," "above," "upper," and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms can be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0061] In the above discussion, unless otherwise stated, the terms "about," "approximately," "substantially" and the like mean a variation of + / - 10% when used to describe a numerical value.

[0062] With the above ideal embodiments according to the present application as the inspiration, through the above description, relevant personnel can certainly make various changes and modifications without deviating from the technical thought of the present application. The technical scope of the present application is not limited to the content in the specification, and must be determined according to the scope of claims.

Claims

1. A glue dispensing machine for automatically mixing liquids, characterized by, The application relates to an automatic liquid mixing rubber mixing machine, which comprises a mixing tank (10), a plurality of liquid delivery assemblies (2) and a premixing mechanism (3). Each of the liquid delivery assemblies (2) comprises a diaphragm pump (21) and an anti-static hose (22), the diaphragm pump (21) is suitable for delivering liquid in a corresponding raw material barrel (11) to the mixing tank (10) through the anti-static hose (22), and the premixing mechanism (3) is arranged in the mixing tank (10) and comprises an elastically arranged premixer (31), a premixing flow channel (32) is arranged in the premixer (31), a plurality of elastic adjusting rods (33) are inserted into the premixer (31), one end of each of the elastic adjusting rods (33) extends into the premixing flow channel (32), and the other end of each of the elastic adjusting rods (33) protrudes out of the premixer (31); wherein the premixer (31) is suitable for generating vibration due to impact force when receiving liquid delivered by each of the diaphragm pumps (21), and the vibration drives corresponding elastic adjusting rods (33) to be pressed to adjust the flow passage section of the corresponding area premixing flow channel (32).

2. The automatic liquid mixing rubber mixing machine according to claim 1, wherein the premixing flow channel (32) is in a spiral shape; and the inflow port (321) and the outflow port (322) of the premixing flow channel (32) are both located in the middle part of the premixer (31).

3. The automatic liquid mixing rubber mixing machine according to claim 2, wherein the premixing mechanism (3) further comprises a mounting plate (301) and a first spring group (34); wherein both sides of the premixer (31) are provided with a receiving plate (311); and the first spring group (34) is arranged on the mounting plate (301) and supports the premixer (31) by abutting against the two receiving plates (311).

4. The automatic liquid mixing rubber mixing machine according to claim 3, wherein the elastic adjusting rod (33) comprises a rod body (331) and a second spring (332); wherein the upper end of the rod body (331) extends into the premixing flow channel (32) and is provided with a piston (333); the middle part of the rod body (331) is provided with an annular boss (334); and the second spring (332) is sleeved on the rod body (331) and abuts against the premixer (31) at one end and abuts against the annular boss (334) at the other end.

5. The automatic liquid mixing rubber mixing machine according to claim 4, wherein when the premixer (31) does not receive liquid, a gap is left between the lower end of the rod body (331) and the mounting plate (301).

6. The automatic liquid mixing rubber mixing machine according to claim 5, wherein the mounting plate (301) is provided with a pair of equal-height blocks (302); and the two equal-height blocks (302) are respectively located below the corresponding receiving plates (311).

7. The automatic liquid mixing rubber mixing machine according to claim 4, wherein the side wall of the premixing flow channel (32) is provided with a plurality of recesses (323); and when the premixer (31) does not receive liquid, the piston (333) of the elastic adjusting rod (33) is arranged in the recess (323). The application relates to an automatic liquid mixing rubber mixing machine, which comprises a mixing tank (10), a plurality of liquid delivery assemblies (2) and a premixing mechanism (3). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 8. A premixing mechanism for a glue dispensing machine for automatically mixing liquids, characterized by, ​ The premixer (31) is elastically arranged, and both sides of the premixer (31) are provided with a receiving plate (311); The mounting plate (301) is provided with a pair of equal-height blocks (302), and the two equal-height blocks (302) are respectively located below the corresponding receiving plate (311); and The first spring group (34); wherein The first spring group (34) is arranged on the mounting plate (301) and supports the premixer (31) by abutting against the two receiving plates (311).

9. The premixing mechanism for the glue dispensing machine for automatically mixing liquid according to claim 8, characterized in that: The premixer (31) is provided with a premixing flow channel (32), and a plurality of elastic adjusting rods (33) are inserted into the premixer (31), one end of each of the elastic adjusting rods (33) extends into the premixing flow channel (32), and the other end protrudes out of the premixer (31).

10. The premixing mechanism for the glue dispensing machine for automatically mixing liquid according to claim 9, characterized in that: The elastic adjusting rod (33) comprises a rod body (331) and a second spring (332); wherein The upper end of the rod body (331) extends into the premixing flow channel (32), and the end is provided with a piston (333); The middle part of the rod body (331) is provided with an annular boss (334); The second spring (332) is sleeved on the rod body (331), one end of the second spring (332) abuts against the premixer (31), and the other end abuts against the annular boss (334).