Adjustable steam milk stick

Abstract

This utility model relates to an adjustable steam milk stick, comprising a stick body with a nozzle; the nozzle is connected to a steam source; a support portion is provided on the stick body; the outer diameter of the support portion is larger than the outer diameter of the stick body along the radial direction of the stick body; a sleeve is fitted onto the stick body; the support portion contacts the inner wall of the sleeve, and the support portion and the sleeve are sealed; a gap exists between the sleeve and the stick body; a through hole is provided on the sleeve; the through hole communicates with the gap; an adjusting sleeve is rotatably fitted onto the sleeve; wherein the orifice of the nozzle is located inside the sleeve and communicates with the gap; rotating the adjusting sleeve around the sleeve, the adjusting sleeve covers or opens the through hole. This utility model adjusts the working state of the steam milk stick by rotating the adjusting sleeve, eliminating the need to adjust the position of the steam milk stick in three-dimensional space, lowering the barrier to use of the steam milk stick, and making it convenient for ordinary consumers.

Description

Technical Field

[0001] This utility model relates to the field of coffee machine technology, and in particular to an adjustable steam milk wand. Background Technology

[0002] Coffee machines use a steam wand to froth milk. When the steam wand sprays steam into the milk, if air is also entrained into the milk, milk foam will be created; if no air is entrained, the high-temperature steam will only heat the milk.

[0003] The patent document CN111295118A, entitled "Apparatus and Method for Foaming a Certain Amount of Milk," mentions a steam milk wand with its steam outlet exposed. In use, to control the steam milk wand to achieve the two different working states mentioned above, the position of the steam wand or the platform used to hold the milk cup needs to be changed. This adjusts the height of the steam wand's steam hole relative to the milk surface, thereby controlling whether and how much air is entrained when the steam impacts the milk. This method of making milk foam requires precise control of the steam wand's position, making it difficult for ordinary users to operate and not conducive to creating aesthetically pleasing and appropriately dense milk foam.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an adjustable steam rod to simplify the use of the steam rod.

[0006] The technical solution of this utility model is as follows:

[0007] The adjustable steam rod includes:

[0008] A rod body with nozzles; the nozzles are connected to a steam source; a support portion is provided on the rod body; along the radial direction of the rod body, the outer diameter of the support portion is larger than the outer diameter of the rod body;

[0009] A sleeve is fitted onto the rod body; the support portion contacts the inner wall of the sleeve, and the support portion and the sleeve are sealed; a gap exists between the sleeve and the rod body; a through hole is formed on the sleeve; the through hole communicates with the gap.

[0010] An adjusting sleeve is rotatably fitted onto the sleeve;

[0011] The nozzle orifice is located inside the sleeve and communicates with the gap; the adjusting sleeve is rotated around the sleeve, and the adjusting sleeve either covers or opens the through hole.

[0012] A further technical solution is that the adjusting sleeve is provided with a venting groove, a baffle, or a notch; wherein the venting groove is formed on the surface of the adjusting sleeve that contacts the sleeve, and the venting groove communicates with one end face of the adjusting sleeve; the baffle is set at the end of the adjusting sleeve near the through hole, and when the adjusting sleeve is rotated around the sleeve, the baffle covers or moves away from the through hole; the notch is formed at the end of the adjusting sleeve near the through hole, and when the adjusting sleeve is rotated around the sleeve, the notch aligns with or moves away from the through hole.

[0013] A further technical solution is that the adjusting sleeve includes an inner ring sleeved on the sleeve and an outer ring sleeved on the inner ring.

[0014] A further technical solution is that the inner ring contacts the surface of the outer ring and extends to form an outer protrusion; an inner groove is formed on the outer ring for the outer protrusion to be engaged.

[0015] A further technical solution is that at least two external protrusions are provided; the different external protrusions have different sizes or shapes; the number, size, and shape of the inner grooves are set in accordance with the number, size, and shape of the external protrusions.

[0016] A further technical solution is that, along the axial direction of the adjusting sleeve, the outer sleeve includes a neck with a reduced diameter; the inner diameter of the neck is smaller than the outer diameter of the inner sleeve, and the inner diameter of the neck is larger than the outer diameter of the sleeve.

[0017] A further technical solution is that a limiting protrusion extends radially on the support portion; a first limiting groove is formed on the sleeve; a strip groove is formed on the adjusting sleeve around the axis of the adjusting sleeve; the limiting protrusion passes through the sleeve along the first limiting groove and then extends into the strip groove.

[0018] A further technical solution is that the first limiting groove is provided along the axial direction of the sleeve and the first limiting groove is connected to one end face of the sleeve; along the axial direction of the adjusting sleeve, a second limiting groove is provided on the adjusting sleeve and the second limiting groove is connected to one end face of the adjusting sleeve and the strip groove.

[0019] A further technical solution is as follows: around the axis of the sleeve, a first groove is formed on the surface of the sleeve that contacts the adjusting sleeve; along the axial direction of the sleeve, a first clearance groove is formed on the surface of the sleeve that contacts the adjusting sleeve; one end of the first clearance groove is connected to the first groove, and the other end of the first clearance groove is close to one end face of the sleeve; a first extension portion is provided on the adjusting sleeve and extends into the first groove.

[0020] A further technical solution is that, around the axis of the sleeve, the sleeve contacts the surface of the adjusting sleeve, and a second groove and a second clearance groove are symmetrically formed on the first groove and the first clearance groove; the second clearance groove communicates with one end face of the sleeve; a second extension is provided on the adjusting sleeve to extend into the second groove.

[0021] The beneficial technical effects of this utility model are as follows:

[0022] (1) The adjustable steam wand of this utility model has nozzles on the wand body that spray steam into the milk. A sleeve is fitted onto the wand body to protect it and prevent milk from splashing. The sleeve has a through hole; when the wand body is inserted into the milk, air flows into the sleeve through the through hole and is drawn into the milk by the steam. An adjusting sleeve is rotatably mounted on the sleeve. Rotating the adjusting sleeve around the sleeve can drive the adjusting sleeve to block, partially block, or not block the through hole, thereby adjusting the cross-sectional area for airflow at the through hole opening. In other words, rotating the adjusting sleeve allows for quick adjustment of the steam wand's air intake, switching the steam wand's working state between heating and milk foaming, or adjusting the speed and size of the milk foam produced. Adjusting the steam wand's working state by rotating the adjusting sleeve eliminates the need to adjust the steam wand's position in three-dimensional space, greatly simplifying operation, lowering the barrier to entry for using the steam wand, and making it convenient for ordinary consumers.

[0023] (2) Furthermore, the adjusting sleeve is configured as an inner ring and an outer ring. The inner ring and the outer ring can be made of different materials to ensure their performance while improving the user experience.

[0024] (3) Furthermore, since the different sizes or shapes of the external protrusions are different, the number, size, and shape of the internal grooves are also set accordingly. That is, an external protrusion can only mate with a specific one of all the internal grooves, so that the inner ring and the outer ring are always assembled at a predetermined angle. This ensures that when the limiting protrusion slides in the strip groove, the outer ring can complete three actions: covering the through hole, partially covering the through hole, and not covering the through hole. Attached Figure Description

[0025] Figure 1 A front view schematic diagram of an adjustable steam rod according to an embodiment of the present disclosure is shown.

[0026] Figure 2 A vertical cross-sectional schematic diagram of an adjustable steam rod according to an embodiment of the present disclosure is shown.

[0027] Figure 3 An exploded structural diagram of an adjustable steam rod according to an embodiment of the present disclosure is shown.

[0028] Figure 4 A right-side structural schematic diagram of an adjustable steam rod according to an embodiment of the present disclosure is shown.

[0029] Figure 5 A right-side structural schematic diagram of an adjustable steam rod according to an embodiment of the present disclosure is shown.

[0030] Figure 6 A three-dimensional structural schematic diagram of the inner ring in an adjustable steam rod according to an embodiment of the present disclosure is shown.

[0031] Figure 7 A three-dimensional structural schematic diagram of the sleeve in an adjustable steam rod according to an embodiment of the present disclosure is shown.

[0032] Marked in the attached diagram:

[0033] 1. Rod body; 11. Steam hole; 12. Spray hole; 13. Support part; 14. Limiting protrusion; 2. Washer; 3. Sleeve; 31. First limiting groove; 32. First groove; 321. First clearance groove; 33. Second groove; 331. Second clearance groove; 34. Through hole; 35. Gap; 4. Adjusting sleeve; 41. Second limiting groove; 42. Strip groove; 43. First extension part; 44. Second extension part; 5. Inner ring; 51. Outer protrusion; 6. Outer ring; 61. Neck; 62. Friction surface; 63. Vent groove; 64. Inner groove; 65. Notch; 66. Baffle. Detailed Implementation

[0034] To make the objectives, features, and advantages of this utility model more apparent and understandable, please refer to the accompanying drawings. It should be noted that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the implementation conditions of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by this utility model, should still fall within the scope of the technical content disclosed in this utility model.

[0035] In the description of this utility model, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0036] Figure 1 A front view schematic diagram of an adjustable steam rod according to an embodiment of the present disclosure is shown. Figure 2A vertical cross-sectional schematic diagram of an adjustable steam rod according to an embodiment of the present disclosure is shown. Figure 3 An exploded structural diagram of an adjustable steam rod according to an embodiment of this disclosure is shown. Please refer to... Figure 1 , Figure 2 and Figure 3 The adjustable steam rod includes a rod body 1 with a nozzle 12 and a steam hole 11. The nozzle 12 connects to the steam hole 11, and the steam hole 11 connects to a steam source. The nozzle 12 is connected to the steam source through the steam hole 11. Steam is sprayed onto the milk along the nozzle 12. A support part 13 is provided on the rod body 1. The outer diameter of the support part 13 is larger than the outer diameter of the rod body 1 along the radial direction of the rod body 1. A sleeve 3 is fitted onto the rod body 1. The support part 13 contacts the inner wall of the sleeve 3, and a seal is formed between the support part 13 and the sleeve 3. Specifically, a washer 2 is fitted onto the support part 13, and the washer 2 is positioned between the support part 13 and the sleeve 3. The washer 2 can be made of elastic materials such as silicone. The elastic deformation of the washer 2 supports the collar and seals the gap 35 between the support part 13 and the sleeve 3, enhancing the stability of the connection between the support part 13 and the sleeve 3. Meanwhile, the gasket 2 ensures a tight seal between the support part 13 and the sleeve 3, preventing steam leakage from the sleeve 3 and air from entering through the gap 35 between the support part 13 and the sleeve 3. Supported by the support part 13, a gap 35 is created between the sleeve 3 and the rod body 1. A through hole 34 is formed on the sleeve 3. The through hole 34 connects to the gap 35, and the orifice of the nozzle 12 is located inside the sleeve 3, connecting to the gap 35. External air flows along the through hole 34 and the gap 35 towards the nozzle 12. An adjusting sleeve 4 is rotatably fitted onto the sleeve 3. Rotating the adjusting sleeve 4 around the sleeve 3 allows the adjusting sleeve 4 to cover or open the through hole 34, adjusting the cross-sectional area for airflow at the orifice of the through hole 34. In other words, rotating the adjusting sleeve 4 allows for quick adjustment of the air intake of the steam rod, switching the steam rod's operating state to heating or foaming, or adjusting the speed and size of the foam produced by the steam rod. The working state of the steam rod is adjusted by rotating the adjusting sleeve 4, eliminating the need to adjust the position of the steam rod in three-dimensional space. This greatly simplifies the operation of the steam rod, lowers the barrier to entry for its use, and makes it easier for ordinary consumers to use. The rod body 1 and the support part 13 can be a single integral component, or they can be two separate components combined together; this application does not impose any restrictions on either.

[0037] Please refer to Figure 2 In some embodiments, the adjusting sleeve 4 is provided with a vent groove 63, which is formed on the surface of the adjusting sleeve 4 that contacts the sleeve 3 and connects to one end face of the adjusting sleeve 4. When the adjusting sleeve 4 is rotated around the sleeve 3, if the vent groove 63 is not aligned with the through hole 34, the adjusting sleeve 4 blocks or partially blocks the through hole 34, reducing or blocking the cross-sectional area for airflow at the through hole 34. When the vent groove 63 is aligned with the through hole 34, the adjusting sleeve 4 no longer blocks the opening of the through hole 34, and at this time, the cross-sectional area for airflow at the through hole 34 is the largest.

[0038] Figure 4 A right-side structural schematic diagram of an adjustable steam rod according to an embodiment of this disclosure is shown. Please refer to... Figure 4 In other embodiments, a notch 65 is provided on the adjusting sleeve 4. The notch 65 is opened at the end of the adjusting sleeve 4 near the through hole 34. When the adjusting sleeve 4 is rotated around the sleeve 3, the notch 65 is aligned with or away from the through hole 34 to adjust the cross-sectional area of ​​the through hole 34 for air flow.

[0039] Figure 5 A right-side structural schematic diagram of an adjustable steam rod according to an embodiment of this disclosure is shown. Please refer to... Figure 5 In other embodiments, a baffle 66 is provided on the adjusting sleeve 4. The baffle 66 is located at the end of the adjusting sleeve 4 near the through hole 34. When the adjusting sleeve 4 is rotated around the sleeve 3, the baffle 66 blocks or moves away from the through hole 34 to adjust the cross-sectional area of ​​the through hole 34 for airflow.

[0040] Figure 6 A three-dimensional structural schematic diagram of the inner ring in an adjustable steam rod according to an embodiment of this disclosure is shown. Please refer to... Figure 2 , Figure 3 and Figure 6 The adjusting sleeve 4 includes an inner ring 5 fitted onto the sleeve 3 and an outer ring 6 fitted onto the inner ring 5. The adjusting sleeve 4 is a split design with an inner ring 5 and an outer ring 6, which can be made of different materials to ensure performance while improving user experience. For example, the inner ring 5 can be made of stainless steel or copper to ensure the connection strength between the sleeve 3 and the inner ring 5, while the outer ring 6 can be made of rubber to increase friction for the operator's grip, facilitating rotation of the entire adjusting sleeve 4. The inner ring 5 has an extended outer protrusion 51 on its surface contacting the outer ring 6. An inner groove 64 is formed on the outer ring 6 for the outer protrusion 51 to engage. Engaging the outer protrusion 51 into the inner groove 64 connects the inner ring 5 and the outer ring 6. In some embodiments, the surface of the adjusting sleeve 4 away from the sleeve 3 is an uneven friction surface 62, facilitating user grip and rotation around the sleeve 3 to adjust the air intake of the through hole 34.

[0041] Preferably, at least two external protrusions 51 are provided. The size or shape of the different external protrusions 51 is different. The number, size, and shape of the inner grooves 64 correspond to the number, size, and shape of the external protrusions 51. That is, one external protrusion 51 can only mate with one specific inner groove 64, ensuring that the inner ring 5 and the outer ring 6 are always assembled at a predetermined angle. This ensures that when the limiting protrusion 14 slides within the strip groove 42, the outer ring 6 can perform three actions: shielding, partially shielding, and not shielding the through hole 34. At this time, markings can be set on the rod body 1 and the adjusting sleeve 4 (as shown in the figure), or on the sleeve 3 and the adjusting sleeve 4, to visually indicate the working status of the steam rod.

[0042] More preferably, along the axial direction of the adjusting sleeve 4, the outer sleeve 6 includes a neck 61 with a reduced diameter. The inner diameter of the neck 61 is smaller than the outer diameter of the inner sleeve 5, and the inner diameter of the neck 61 is larger than the outer diameter of the sleeve 3, so that the neck 61 contacts the sleeve 3, facilitating the outer sleeve 6 to cover the sealing through hole 34. At the same time, the transition position between the neck 61 and the outer sleeve 6 can be used to position the relative position between the inner sleeve 5 and the outer sleeve 6. The inner sleeve 5 and the outer sleeve 6 are edge-fitted.

[0043] Please refer to Figure 2 , Figure 3 and Figure 6 A limiting protrusion 14 extends radially from the support portion 13. A first limiting groove 31 is formed on the sleeve 3. A strip groove 42 is formed on the adjusting sleeve 4 around its axis. The limiting protrusion 14 passes through the sleeve 3 along the first limiting groove 31 and extends into the strip groove 42. The first limiting groove 31 is arranged along the axial direction of the sleeve 3 and connects to one end face of the sleeve 3. The first limiting groove 31 connects to one end face of the sleeve 3, facilitating the locking of the limiting protrusion 14 into the first limiting groove 31 along the end face of the sleeve 3.

[0044] Along the axial direction of the adjusting sleeve 4, a second limiting groove 41 is formed on the adjusting sleeve 4, connecting one end face of the adjusting sleeve 4 and the strip groove 42. The second limiting groove 41 facilitates the insertion of the limiting protrusion 14 into the second limiting groove 41 along the end face of the adjusting sleeve 4, and then its sliding into the strip groove 42. After the limiting protrusion 14 slides into the strip groove 42, the adjusting sleeve 4 is rotated around the sleeve 3, and the limiting protrusion 14 slides within the strip groove 42. At this time, the limiting protrusion 14 is misaligned with the second limiting groove 41, and the adjusting sleeve 4 slides along the axial direction of the sleeve 3. The limiting protrusion 14 interferes with the side wall of the strip groove 42, fixing the adjusting sleeve 4 onto the sleeve 3. In other words, the adjusting sleeve 4 and the sleeve 3 are snapped onto the rod body 1. This snap-fit ​​connection method allows for assembly and disassembly without the need for complex tools, simplifying the process and increasing efficiency, making it convenient for users to maintain and clean the adjustable steam rod.

[0045] Figure 7A three-dimensional structural schematic diagram of the sleeve in an adjustable steam rod according to an embodiment of this disclosure is shown. Please refer to... Figure 2 , Figure 3 , Figure 6 and Figure 7 A first groove 32 is formed on the surface of the sleeve 3 that contacts the adjusting sleeve 4, around the axis of the sleeve 3. A first clearance groove 321 is formed on the surface of the sleeve 3 that contacts the adjusting sleeve 4, along the axial direction of the sleeve 3. One end of the first clearance groove 321 connects to the first groove 32, and the other end of the first clearance groove 321 is close to one end face of the sleeve 3. A first extension portion 43 extends from the adjusting sleeve 4 and extends into the first groove 32. The first clearance groove 321 is close to the end of the sleeve 3, facilitating the insertion of the extension portion into the first clearance groove 321. Then, the first extension portion 43 slides along the first clearance groove 321, engaging the first extension portion 43 into the first groove 32. The engagement of the first extension portion 43 into the first groove 32 connects the adjusting sleeve 4 and the sleeve 3.

[0046] Preferably, around the axis of the sleeve 3, the surface of the sleeve 3 contacts the surface of the adjusting sleeve 4, and a second groove 33 and a second clearance groove 331 are symmetrically formed on the first groove 32 and the first clearance groove 321. The second clearance groove 331 connects to one end face of the sleeve 3. A second extension 44 extends from the adjusting sleeve 4 and extends into the second groove 33. When the sleeve 3 and the adjusting sleeve 4 are engaged, the first extension 43, the first groove 32, the second extension 44, and the second groove 33 cooperate, and through symmetrical mechanical distribution, the load between the sleeve 3 and the adjusting sleeve 4 is transmitted more evenly, comprehensively optimizing the strength and stability of the connection structure between the sleeve 3 and the adjusting sleeve 4.

[0047] The specific workflow of this utility model is as follows:

[0048] The adjustable steam wand is inserted into the milk, with one part of the nozzle 12 below the liquid surface and the other part above it. When only heating the milk and not requiring foaming, the adjusting sleeve 4 is rotated around the sleeve 3. During rotation, the limiting protrusion 14 slides within the strip groove 42 until the outer ring 6 completely covers the through hole 34. At this point, air cannot enter the sleeve 3 along the through hole 34, and the steam emitted from the nozzle 12 cannot be drawn into the milk. In this state, the adjustable steam wand only heats the milk and does not produce foam.

[0049] When milk foam needs to be generated, the adjusting sleeve 4 is rotated around the sleeve 3. During the rotation of the adjusting sleeve 4, the limiting protrusion 14 slides within the strip groove 42 until the outer ring 6 no longer completely covers the through hole 34. At this time, air can enter the sleeve 3 along the through hole 34, and the steam ejected from the nozzle 12 can entrain air into the milk. At this time, the adjustable steam rod heats the milk while generating milk foam. To increase or decrease the milk foam generation rate, the adjusting sleeve 4 is rotated around the sleeve 3 to decrease or increase the area covered by the adjusting sleeve 4 over the through hole 34, thereby expanding or decreasing the cross-sectional area for airflow at the opening of the through hole 34. When the cross-sectional area for airflow at the opening of the through hole 34 is expanded, more air enters the sleeve 3 along the through hole 34, and more air can be entrained into the milk when the steam impacts it, thus increasing the milk foam generation rate. When the cross-sectional area for airflow at the opening of the through hole 34 is reduced, less air enters the sleeve 3 along the through hole 34, and less air is drawn into the milk when steam aerates the milk, thereby reducing the rate of milk foam generation.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An adjustable steam milk stick, characterized in that, The adjustable steam milk bar includes: A rod body with nozzles; the nozzles are connected to a steam source; a support portion is provided on the rod body; along the radial direction of the rod body, the outer diameter of the support portion is larger than the outer diameter of the rod body; A sleeve is fitted onto the rod body; the support portion contacts the inner wall of the sleeve, and the support portion and the sleeve are sealed; a gap exists between the sleeve and the rod body; a through hole is formed on the sleeve; the through hole communicates with the gap. An adjusting sleeve is rotatably fitted onto the sleeve; The nozzle orifice is located inside the sleeve and communicates with the gap; the adjusting sleeve is rotated around the sleeve, and the adjusting sleeve either covers or opens the through hole.

2. The adjustable steam milk bar as described in claim 1, characterized in that: The adjusting sleeve is provided with a venting groove, a baffle, or a notch; wherein the venting groove is formed on the surface of the adjusting sleeve that contacts the sleeve, and the venting groove communicates with one end face of the adjusting sleeve; the baffle is set at the end of the adjusting sleeve near the through hole, and when the adjusting sleeve is rotated around the sleeve, the baffle covers or moves away from the through hole; the notch is formed at the end of the adjusting sleeve near the through hole, and when the adjusting sleeve is rotated around the sleeve, the notch aligns with or moves away from the through hole.

3. The adjustable steam milk bar as described in claim 1, characterized in that: The adjusting sleeve includes an inner ring sleeved on the sleeve and an outer ring sleeved on the inner ring.

4. The adjustable steam milk bar as described in claim 3, characterized in that: The inner ring contacts the surface of the outer ring and extends to form an outward protrusion; the outer ring has an inner groove for the outward protrusion to be inserted.

5. The adjustable steam milk bar as described in claim 4, characterized in that: At least two external protrusions are provided; the size or shape of the different external protrusions is different; the number, size, and shape of the internal grooves are set in accordance with the number, size, and shape of the external protrusions.

6. The adjustable steam milk bar as described in claim 3, characterized in that: Along the axial direction of the adjusting sleeve, the outer sleeve includes a neck with a reduced diameter; the inner diameter of the neck is smaller than the outer diameter of the inner sleeve, and the inner diameter of the neck is larger than the outer diameter of the sleeve.

7. The adjustable steam milk stick as described in claim 1, characterized in that: A limiting protrusion extends radially on the support portion; a first limiting groove is formed on the sleeve; a strip groove is formed on the adjusting sleeve around the axis of the adjusting sleeve; the limiting protrusion passes through the sleeve along the first limiting groove and then extends into the strip groove.

8. The adjustable steam milk bar as described in claim 7, characterized in that: The first limiting groove is provided along the axial direction of the sleeve and is connected to one end face of the sleeve; along the axial direction of the adjusting sleeve, a second limiting groove is provided on the adjusting sleeve and is connected to one end face of the adjusting sleeve and the strip groove.

9. The adjustable steam milk bar as described in claim 1, characterized in that: A first groove is formed on the surface of the sleeve that contacts the adjusting sleeve around the axis of the sleeve; a first clearance groove is formed on the surface of the sleeve that contacts the adjusting sleeve along the axial direction of the sleeve; one end of the first clearance groove is connected to the first groove, and the other end of the first clearance groove is close to one end face of the sleeve; a first extension is provided on the adjusting sleeve to extend into the first groove.

10. The adjustable steam milk stick as described in claim 9, characterized in that: Around the axis of the sleeve, the sleeve contacts the surface of the adjusting sleeve, and a second groove and a second clearance groove are symmetrically formed on the first groove and the first clearance groove; the second clearance groove communicates with one end face of the sleeve; a second extension is provided on the adjusting sleeve to extend into the second groove.

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