Hidden type bean grinding adjusting structure and portable coffee machine thereof

Abstract

The utility model discloses a hidden type bean grinding adjusting structure and a portable coffee machine thereof, and belongs to the technical field of coffee equipment, the hidden type bean grinding adjusting structure comprises a supporting shell, the upper end of the supporting shell is detachably connected with a bean bin, and the lower end of the supporting shell is provided with a grinding mechanism; the grinding mechanism comprises a grinding cavity, a tool bit is arranged in the grinding cavity, and a grinding disc is arranged around the periphery of the tool bit; an adjusting wheel is arranged outside the grinding cavity and used for adjusting the gap between the tool bit and the grinding disc. When the bean bin is detached from the supporting shell, the through hole is exposed; when the adjusting wheel is screwed, the grinding disc ascends or descends relative to the tool bit. According to the utility model, the adjusting wheel is hidden below the bean bin, and the operation is only performed through the through hole after the bean bin is disassembled. The through hole and the adjusting hole are arranged oppositely, so that rapid adjustment of a single tool is supported, the whole machine does not need to be disassembled, the operation complexity is reduced, and the multiple requirements of a user for stability, accuracy, convenience and attractiveness of the portable coffee machine are met.

Description

Technical Field

[0001] This utility model belongs to the field of coffee equipment technology, specifically relating to a concealed bean grinding adjustment structure and its portable coffee machine. Background Technology

[0002] In recent years, with the improvement of living standards and the popularization of coffee culture, portable coffee machines have gradually become an important category in the home kitchen appliance market due to their compact design, convenient operation, and integrated functions. These devices, by integrating core functions such as grinding, heating, and brewing, satisfy users' pursuit of the fresh taste of freshly ground coffee, while also considering space utilization efficiency and ease of use. For example, existing technologies have already developed portable coffee machines that integrate grinding and pressing functions, simplifying the operation process through detachable component designs, further promoting their penetration in the consumer market. However, with the diversification of user needs, how to achieve more personalized functions within limited space has become a key direction for the technological iteration of portable coffee machines.

[0003] In the prior art, such as Chinese patent document CN209574403U, a portable coffee machine is disclosed. This machine uses a first drive device to drive a rotating water tank, ensuring hot water evenly contacts the coffee grounds to improve extraction. It also integrates the entire process of grinding, heating, and brewing. However, the adjustment structure of the grinding device in this solution still has limitations: the grinding mechanism is usually preset and fixed, making it impossible to adjust the grind size according to the user's varying needs for coffee flavor. Although a few products offer grind adjustment functions, the adjustment structure is mostly exposed on the device surface, making it prone to parameter deviations due to accidental touches or dust intrusion, affecting operational stability. Furthermore, for most users, grind size adjustment is not a frequent need; exposed adjustment structures not only increase the complexity of the device but may also disrupt the overall simplicity of the design.

[0004] Therefore, there is an urgent need for a concealed adjustment solution that can meet personalized needs while also ensuring equipment reliability and aesthetics. For example, the adjustment mechanism could be hidden under the bean hopper, and the adjustment could be performed only when necessary by disassembling the bean hopper, thus balancing functionality and user experience. Summary of the Invention

[0005] In response to the problems in related technologies, this utility model proposes a concealed grinding adjustment structure and its portable coffee machine to solve the technical problem that existing portable coffee machines are unable to balance the personalized needs of grinding coarseness and the concealment of low-frequency adjustment functions.

[0006] The technical solution of this utility model is implemented as follows: a concealed bean grinding adjustment structure includes a support shell, a bean hopper detachably connected to the upper end of the support shell, and a grinding mechanism provided at the lower end of the support shell; a bean inlet is provided at the bottom of the bean hopper, and the bean inlet is connected to the feed inlet of the grinding mechanism; the grinding mechanism includes a grinding chamber, a blade is provided in the grinding chamber, and a grinding disc is arranged around the outer periphery of the blade; an adjustment wheel is provided outside the grinding chamber, and the adjustment wheel is directly or indirectly connected to the grinding disc.

[0007] The upper end of the adjusting wheel has an adjusting hole, and the support housing has a through hole, which is directly opposite the adjusting hole. When the bean hopper is removed from the support housing, the through hole is exposed. When the adjusting wheel is turned, the grinding disc rises or falls relative to the blade.

[0008] This invention hides the adjustment wheel beneath the bean hopper, allowing operation only through a through-hole after disassembling the bean hopper. The through-hole and adjustment hole are aligned, enabling quick adjustment with a single tool without disassembling the entire machine, reducing operational complexity and meeting users' multiple needs for a stable, precise, convenient, and aesthetically pleasing portable coffee machine.

[0009] As a further improvement to the above solution, it also includes nested inner and outer adjusting rings; the adjusting wheel is located on one side of the outer adjusting ring and is driven by the outer adjusting ring; the outer and inner adjusting rings have a mutually mating threaded structure; the inner adjusting ring is fixed relative to the grinding disc; when the adjusting wheel rotates, the outer adjusting ring rotates around its axis, driving the inner adjusting ring to raise or lower the grinding disc. The adjusting wheel and the grinding disc are connected by the transmission of the outer and inner adjusting rings. By rotating the adjusting wheel, the grinding disc is driven to rise and fall relative to the blade head, achieving linear adjustment of the grinding gap. This simplifies the structural layout, allows for precise control of the grinding coarseness, and reduces the decrease in precision caused by mechanical wear, meeting the high space utilization requirements of small portable coffee machines.

[0010] As a further improvement to the above solution, the outer adjusting ring and the adjusting wheel are connected by at least one of the following transmission methods: gear meshing transmission, chain transmission, and synchronous belt transmission.

[0011] As a further improvement to the above solution, the lower end face of the support housing protrudes downward along the circumferential edge of the through hole to form an annular sleeve portion; the grinding mechanism includes a base shell, and a support shaft is provided on one side of the base shell;

[0012] The lower end of the adjusting wheel is sleeved on the support shaft, and the upper end of the adjusting wheel extends to the support housing, cooperating with the annular sleeve. The arrangement of the adjusting wheel with both the support shaft and the annular sleeve facilitates smooth rotation of the adjusting wheel. Furthermore, the through hole on the support housing aligns with the adjusting hole on the top of the adjusting wheel, allowing the adjusting wheel to be turned directly through the through hole using a single tool (such as a hex wrench) after disassembling the bean hopper, eliminating the need for disassembling the entire machine or complex adjustment procedures, thus combining concealment with ease of operation.

[0013] As a further improvement to the above solution, the bottom of the bean hopper is provided with at least one downward-protruding boss, and the boss has a through locking hole; the supporting shell has a corresponding groove, and when the bean hopper is installed on the supporting shell, the boss and the groove mate accordingly; the fastener passes through the locking hole to lock the bean hopper onto the supporting shell. The design of the locking hole at the bottom of the bean hopper, the boss, and the groove on the supporting shell significantly improves connection stability and locking reliability. The boss embedded in the groove forms a physical limit, ensuring precise alignment of the bean hopper during installation and avoiding sealing failure or structural misalignment due to misalignment; the design of the locking hole passing through the boss allows the fastener to act directly on the contact surface between the boss and the groove when passing through, enhancing the local locking force and preventing locking failure due to the thinness of the injection-molded shell.

[0014] As a further improvement to the above solution, the inner wall of the bean hopper is further covered by a cover plate at the locking hole. The cover plate protrudes to one side to form a hinged lid section, and the inner wall of the bean hopper has a recess at the hinged lid section to provide space for lifting the lid. By setting an embedded cover plate at the locking hole, the cover plate covers the locking hole and fasteners, preventing them from being exposed and disrupting the visual integrity of the inner wall of the bean hopper, thus achieving a "covering up" effect. The hinged lid section protrudes to one side and has a corresponding recess to reserve space for lifting the lid. Users can directly pry open the hinged lid section with their fingers, and quickly open the lid for locking without tools, taking into account both ease of disassembly and structural simplicity.

[0015] As a further improvement to the above solution, the bottom of the bean hopper is gradually narrowed from top to bottom into a bucket shape, and an annular flange is provided at the narrowing point to form the lower bean opening; the supporting shell is concave and adapts to the bottom of the bean hopper; the concave part of the supporting shell is provided with an opening for the annular flange of the bean hopper to be inserted.

[0016] As a further improvement to the above solution, a sealing ring is also fitted at the feed inlet of the grinding mechanism, with the other end of the sealing ring connecting to the extension of the through-hole. The bucket-shaped narrowing design at the bottom of the bean hopper, combined with the annular flange, precisely engages with the concave structure of the supporting shell, ensuring a tight alignment between the bean inlet and the feed inlet of the grinding mechanism, reducing bean residue or leakage; the annular flange is embedded in the through-hole to form a physical limit, enhancing connection stability and preventing misalignment risks caused by grinding vibration; the two ends of the sealing ring are respectively fitted onto the feed inlet and the extension of the through-hole, achieving a flexible seal between the bean hopper and the grinding mechanism, effectively preventing coffee powder from escaping, while buffering mechanical vibration, extending the seal life, and balancing seal reliability and structural adaptability.

[0017] As a further improvement to the above solution, the shape of the adjustment hole includes internal hexagonal, slotted, cross-shaped, plum blossom, or square-headed slots.

[0018] A portable coffee machine includes a concealed bean grinding and adjustment structure as described above. The adjustment wheel is hidden beneath the bean hopper, and operation is only possible through a through-hole after removing the bean hopper. The through-hole and adjustment hole are aligned to support quick adjustment with a single tool, eliminating the need to disassemble the entire machine, reducing operational complexity, and meeting users' multiple needs for a stable, precise, convenient, and aesthetically pleasing portable coffee machine.

[0019] Beneficial effects:

[0020] (1) Concealed design avoids accidental touch and improves adjustment stability: By hiding the adjustment wheel under the bean hopper, the through hole is only exposed after the bean hopper is removed to operate the adjustment wheel, which effectively prevents parameter deviation caused by accidental touch or dust intrusion during daily use. This design not only retains the user's ability to adjust the grinding coarseness independently, but also avoids the problem of structural stability damage in high-frequency operation scenarios, ensuring long-term reliability of grinding parameters.

[0021] (2) Optimized transmission connection for improved precision and compact structure: The adjusting wheel is directly or indirectly connected to the grinding disc. By rotating the adjusting wheel, the grinding disc is driven to rise and fall relative to the blade head, thus achieving linear adjustment of the grinding gap. This transmission method simplifies the structural layout, accurately controls the grinding coarseness, and reduces the decrease in precision caused by mechanical wear, meeting the high space utilization requirements of small portable coffee machines.

[0022] (3) The through hole and adjustment hole are designed to simplify the operation process: The through hole on the support housing is aligned with the adjustment hole on the top of the adjustment wheel. After disassembling the bean hopper, the adjustment wheel can be turned directly through the through hole with a single tool (such as a hex wrench), without disassembling the whole machine or complicated debugging steps. This structure takes into account both concealment and ease of operation. It does not occupy external space, nor does it destroy the overall simplicity of the equipment's appearance. It lowers the user's adjustment threshold and avoids component wear caused by frequent disassembly. Attached Figure Description

[0023] Figure 1 This is a perspective view of the grinding adjustment structure of this utility model;

[0024] Figure 2 This is an exploded view of the grinding adjustment structure of this utility model.

[0025] Figure 3 This is a cross-sectional schematic diagram of the grinding adjustment structure of this utility model;

[0026] Figure 4 This is a schematic diagram of the bean grinding adjustment structure of this utility model without the bean hopper removed;

[0027] Figure 5 This is a perspective view of the coffee machine of this utility model;

[0028] Figure label:

[0029] 1. Coffee machine;

[0030] 2. Grinding adjustment structure; 2a. Base shell; 2b. Support shaft;

[0031] Z1, Support housing; Z11, Annular sleeve; Z12, Groove; Z13, Through port;

[0032] Z2, through hole;

[0033] 21. Bean storage bin; 21a. Bean outlet;

[0034] 22. Grinding mechanism; 22a. Grinding chamber; 22b. Output end; 22c. Feed inlet; 221. Cutting head; 222. Grinding disc;

[0035] 23. Inner regulating ring;

[0036] 24. Outer adjusting ring;

[0037] 25. Adjusting wheel; 251. Adjusting hole;

[0038] 26. Locking hole; 261. Boss;

[0039] 27. Cover plate; 271. Flip-top section;

[0040] 28. Sealing ring. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] In the description of this utility model, it should be understood that the term "several" means "at least one", and the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", 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 component 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.

[0043] Example:

[0044] like Figures 1-5 As shown, this embodiment provides a portable coffee machine, including a concealed bean grinding adjustment structure. Specifically, it includes a support housing Z1, with a bean hopper 21 detachably connected to the upper end of the support housing Z1, and a grinding mechanism 22 at the lower end of the support housing Z1. The bean hopper 21 has a bean inlet 21a at its bottom, which is connected to the feed inlet 22c of the grinding mechanism 22. The grinding mechanism 22 includes a grinding chamber 22a, in which a blade 221 is provided, and a grinding disc 222 is arranged around the outer periphery of the blade 221. Specifically, the blade 221 is a frustum structure that gradually increases in size from top to bottom. The side of the grinding disc 222 that contacts the blade 221 is a curved surface structure that is narrow in the middle and wide at the top and bottom, and the part of the grinding disc 222 that widens at the bottom is adapted to the lower part of the blade 221.

[0045] An adjusting wheel 25 is provided outside the grinding chamber 22a, and the adjusting wheel 25 is directly or indirectly connected to the grinding disc 222. Specifically, it also includes an inner adjusting ring 23 and an outer adjusting ring 24 nested together. The adjusting wheel 25 is located on one side of the outer adjusting ring 24 and is in transmission cooperation with the outer adjusting ring 24. The outer adjusting ring 24 and the inner adjusting ring 23 have mutually cooperating threaded structures. The inner adjusting ring 23 is relatively fixed to the grinding disc 222. The outer adjusting ring 24 and the adjusting wheel 25 are powered by at least one of the following transmission methods: gear meshing transmission, chain transmission, and synchronous belt transmission. In this embodiment, the outer adjusting ring 24 and the adjusting wheel 25 are driven by gear meshing.

[0046] The upper end of the adjusting wheel 25 has an adjusting hole 251, and the supporting housing Z1 has a through hole Z2, which is directly opposite the adjusting hole 251. The shape of the adjusting hole 251 includes hexagonal socket, slotted slot, cross slot, Torx slot, or square slot. In this embodiment, hexagonal socket is preferred. The hexagonal socket design improves the engagement tightness between the tool (such as a hex wrench) and the hole wall through a multi-faceted contact structure, significantly enhancing torque transmission efficiency and reducing the risk of slippage. The countersunk structure can be completely embedded in the surface of the component, avoiding external protrusion interference and maintaining the flatness of the appearance.

[0047] When the bean hopper 21 is detached from the support housing Z1, the through hole Z2 is exposed. When the adjusting wheel 25 is turned, the outer adjusting ring 24 rotates around its axis, driving the inner adjusting ring 23 to raise or lower the grinding disc 222 relative to the blade head 221. The adjusting wheel 25 and the grinding disc 222 are connected by the transmission of the outer adjusting ring 24 and the inner adjusting ring 23. By rotating the adjusting wheel 25, the grinding disc 222 is driven to rise and fall relative to the blade head 221, realizing linear adjustment of the grinding gap. This simplifies the structural layout, allows for precise control of the grinding coarseness, and reduces the decrease in precision caused by mechanical wear, meeting the high space utilization requirements of small portable coffee machines.

[0048] In this embodiment, the lower end face of the support housing Z1 protrudes downward along the circumferential edge of the through hole Z2 to form an annular sleeve Z11; the grinding mechanism 22 includes a base shell 2a, and a support shaft 2b is provided on one side of the base shell 2a;

[0049] The lower end of the adjusting wheel 25 is sleeved on the support shaft 2b, and the upper end of the adjusting wheel 25 extends to the support housing Z1, cooperating with the annular sleeve Z11. The arrangement of the adjusting wheel 25 in conjunction with the support shaft 2b and the annular sleeve Z11 facilitates smooth rotation of the adjusting wheel 25. Furthermore, the through hole Z2 on the support housing Z1 is aligned with the adjusting hole 251 on the top of the adjusting wheel 25. After disassembling the bean hopper 21, the adjusting wheel 25 can be turned directly through the through hole Z2 using a single tool, eliminating the need for disassembling the entire machine or complex adjustment procedures, thus combining concealment and ease of operation.

[0050] In this embodiment, the bottom of the bean hopper 21 is provided with at least one downwardly protruding boss 261, and the boss 261 is provided with a through locking hole 26; the supporting shell Z1 is provided with a corresponding groove Z12. When the bean hopper 21 is installed on the supporting shell Z1, the boss 261 and the groove Z12 are correspondingly engaged; the fastener passes through the locking hole 26 to lock the bean hopper 21 onto the supporting shell Z1. Through the design of the locking hole 26, the boss 261 and the groove Z12 of the supporting shell Z1 at the bottom of the bean hopper 21, the connection stability and locking reliability are significantly improved. The boss 261 is embedded in the groove Z12 to form a physical limit, ensuring that the bean hopper 21 is accurately aligned during installation and avoiding sealing failure or structural misalignment caused by misalignment; the design of the locking hole 26 passing through the boss 261 allows the fastener to act directly on the contact surface between the boss 261 and the groove Z12 when it passes through, enhancing the local locking force and avoiding locking failure due to the thinness of the injection-molded shell. In this embodiment, two locking holes 26 are provided, one of which is located beside the through hole Z2. The fastener can be a countersunk screw.

[0051] In this embodiment, the inner wall of the bean hopper 21 is further covered by a cover plate 27 at the locking hole 26. The cover plate 27 protrudes to one side to form a lifting part 271. The inner wall of the bean hopper 21 has a recess at the lifting part 271 to provide space for lifting the cover. By setting an embedded cover plate 27 at the locking hole 26, the cover plate 27 covers the locking hole 26 and fasteners, preventing them from being exposed and damaging the visual integrity of the inner wall of the bean hopper 21, thus achieving a "covering up" effect. The lifting part 271 protrudes to one side and a corresponding groove Z12 is reserved for lifting space. Users can directly pry open the lifting part 271 with their fingers, and can quickly open the cover plate 27 for locking without tools, taking into account both ease of disassembly and structural simplicity.

[0052] In this embodiment, the bottom of the bean hopper 21 is gradually narrowed from top to bottom in the shape of a bucket, and an annular flange is provided at the narrowing part to form the lower bean opening 21a; the supporting shell Z1 is concave and is adapted to the bottom of the bean hopper 21; the concave part of the supporting shell Z1 is provided with an opening Z13 for the annular flange of the bean hopper 21 to be inserted.

[0053] In this embodiment, a sealing ring 28 is also fitted at the feed inlet 22c of the grinding mechanism 22, and the other end of the sealing ring 28 extends and connects to the through-hole Z13. The sealing ring 28 can be made of flexible silicone. The bottom of the bean hopper 21 has a funnel-shaped narrowing design and an annular flange, which precisely engages with the concave structure of the support housing Z1, ensuring that the lower bean inlet 21a and the feed inlet 22c of the grinding mechanism 22 are tightly aligned, reducing bean residue or leakage; the annular flange is embedded in the through-hole Z13 to form a physical limit, enhancing connection stability and preventing the risk of misalignment caused by grinding vibration; the two ends of the sealing ring 28 are respectively fitted into the feed inlet 22c and the extension of the through-hole Z13, realizing a flexible seal between the bean hopper 21 and the grinding mechanism 22, effectively preventing coffee powder from escaping, while buffering mechanical vibration, extending the seal life, and taking into account both sealing reliability and structural adaptability.

[0054] In practical applications, using the above-described solution of this utility model: when it is necessary to adjust the grind coarseness, the cover plate 27 on the inner wall of the bean hopper 21 can be lifted, the fasteners unscrewed, and the bean hopper 21 can be removed from the support housing Z1. At this time, the through hole Z2 on the support housing Z1 is exposed. By directly passing a hex wrench through the through hole Z2, the adjusting wheel 25 can be turned. The outer adjusting ring 24 rotates around its axis, driving the inner adjusting ring 23 to move the grinding disc 222 up or down relative to the blade head 221, thereby achieving linear adjustment of the grinding gap. In this embodiment, by hiding the adjusting wheel 25 under the bean hopper 21, it can be operated only through the through hole Z2 after disassembling the bean hopper 21. The through hole Z2 and the adjusting hole 251 are arranged opposite each other, supporting quick adjustment with a single tool without disassembling the entire machine, reducing operational complexity, and meeting users' multiple needs for a stable, precise, convenient, and aesthetically pleasing portable coffee machine.

[0055] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A concealed bean grinding adjustment structure, comprising a support shell, wherein a bean hopper is detachably connected to the upper end of the support shell, and a grinding mechanism is provided at the lower end of the support shell; a bean inlet is provided at the bottom of the bean hopper, and the bean inlet is interconnected with the feed inlet of the grinding mechanism; characterized in that: The grinding mechanism includes a grinding chamber, a cutting head is provided inside the grinding chamber, and a grinding disc is arranged around the outer periphery of the cutting head; an adjusting wheel is provided outside the grinding chamber, and the adjusting wheel is directly or indirectly connected to the grinding disc. The upper end of the adjusting wheel has an adjusting hole, and the support housing has a through hole, which is directly opposite the adjusting hole. When the bean hopper is removed from the support housing, the through hole is exposed. When the adjusting wheel is turned, the grinding disc rises or falls relative to the blade.

2. The concealed grinding adjustment structure according to claim 1, characterized in that, It also includes an inner and outer adjusting ring nested together; the adjusting wheel is located on one side of the outer adjusting ring and is in drive cooperation with the outer adjusting ring; the outer adjusting ring and the inner adjusting ring have a mutually cooperating threaded structure; the inner adjusting ring is fixed relative to the grinding disc; when the adjusting wheel rotates, the outer adjusting ring rotates around its axis, driving the inner adjusting ring to drive the grinding disc to rise or fall.

3. The concealed grinding adjustment structure according to claim 2, characterized in that, The outer adjusting ring and the adjusting wheel are connected by at least one of the following transmission methods: gear meshing, chain drive, and synchronous belt drive.

4. The concealed grinding adjustment structure according to claim 1, characterized in that, The lower end face of the support housing protrudes downward along the circumferential edge of the through hole to form an annular sleeve portion; the grinding mechanism includes a base shell, and a support shaft is provided on one side of the base shell; The lower end of the adjusting wheel is sleeved on the support shaft, and the upper end of the adjusting wheel extends to the support housing, cooperating with the annular sleeve portion.

5. The concealed grinding adjustment structure according to claim 1, characterized in that, The bottom of the bean hopper is provided with at least one downward protruding boss, and the boss is provided with a through locking hole; the support housing is provided with a corresponding groove, and when the bean hopper is installed on the support housing, the boss and the groove are matched accordingly; the fastener passes through the locking hole to lock the bean hopper on the support housing.

6. The concealed grinding adjustment structure according to claim 5, characterized in that, The inner wall of the bean hopper is also covered by a cover plate at the locking hole. The cover plate protrudes to one side to form a lifting part. The inner wall of the bean hopper has a recess at the lifting part to provide space for lifting the cover.

7. The concealed grinding adjustment structure according to claim 1, characterized in that, The bottom of the bean hopper is gradually narrowed from top to bottom in a bucket shape, and an annular flange is provided at the narrowing point to form the lower bean opening; the supporting shell is concave and fits into the bottom of the bean hopper; the concave part of the supporting shell is provided with an opening for the annular flange of the bean hopper to be inserted.

8. The concealed grinding adjustment structure according to claim 7, characterized in that, A sealing ring is also fitted at the feed inlet of the grinding mechanism, and the other end of the sealing ring extends and connects to the through-hole.

9. The concealed grinding adjustment structure according to claim 1, characterized in that, The shape of the adjustment hole includes internal hexagonal, slotted, cross-shaped, plum blossom, or square-headed slots.

10. A portable coffee machine, characterized in that, Includes a concealed grinding adjustment structure as described in any one of claims 1-9.

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