Coffee machine

Abstract

The coffee machine comprises a machine shell and a bean grinding device, the bean grinding device comprises a bean bin assembly and a bean grinding assembly, the machine shell comprises a mounting cavity, the top of the mounting cavity is open, and the bean grinding assembly comprises a movable grinding disc, static grinding discs arranged on the periphery of the movable grinding disc at intervals and a motor used for driving the movable grinding disc to rotate; the bean bin assembly and the bean grinding assembly of the bean grinding device are assembled into a whole, and therefore the whole formed by the bean bin assembly and the bean grinding assembly is detachably installed in the installation cavity. Compared with the prior art, the bean grinding device has the advantages that the bean bin assembly and the bean grinding assembly are assembled into a whole and installed in the installation cavity formed by the machine shell as a whole, so that the disassembly and assembly steps are simplified, the bean grinding device can be conveniently disassembled and assembled, and follow-up replacement, maintenance, cleaning and the like are facilitated.

Description

Technical Field

[0001] This utility model relates to a beverage brewing device, and more particularly to a coffee machine. Background Technology

[0002] As people's lifestyles change and their quality of life improves, more and more people are beginning to accept and enjoy coffee as a beverage, leading to the emergence of various coffee machines for home use.

[0003] Currently, most coffee machines come with a grinding device. For example, Chinese Patent Application No. 202420337214.7 discloses an installation structure for a coffee machine grinding component, which includes a grinding body with a processing chamber, a grinding device disposed in the processing chamber, and a driver disposed on the grinding body for driving the grinding device. A first disassembly and locking connection is provided between the grinding device and the grinding body. The grinding device is mounted on the grinding body through the first disassembly and locking connection. The grinding device includes a grinding chamber and a grinding assembly disposed on the grinding chamber. The grinding chamber is detachably disposed in the processing chamber.

[0004] The aforementioned existing coffee machine can be disassembled simply by rotating the grinding unit and the top cover assembly. However, disassembly requires first removing the entire grinding unit from the main body, then removing the top cover assembly, then removing the grinding components, then taking out the grinder, dust collector, and rotating shaft from the grinding chamber, and finally disassembling the grinder, dust collector, and rotating shaft before disassembling the drive unit and the main grinding unit. Not only are the disassembly and installation steps complex, but the lower bean hopper and upper grinding disc mean that the powder path can only be cleaned when there are no coffee beans in the grinding chamber, causing inconvenience. Furthermore, for some models, the size of the main grinding unit is limited, resulting in insufficient space to install the drive unit.

[0005] Therefore, further improvements are needed. Utility Model Content

[0006] The first technical problem to be solved by this utility model is to provide a coffee machine that can easily disassemble and assemble the grinding device, in order to address the shortcomings of the existing technology.

[0007] The second technical problem to be solved by this utility model is to provide a coffee machine that is easy to clean, saves installation space, and facilitates miniaturization, in order to address the shortcomings of the prior art.

[0008] The technical solution adopted by this utility model to solve the first technical problem mentioned above is as follows: a coffee machine, including a casing and a grinding device, the grinding device including a bean hopper assembly and a grinding assembly, the casing including a mounting cavity, the top of the mounting cavity being open, characterized in that:

[0009] The grinding assembly includes a moving grinding disc, stationary grinding discs spaced apart on the outer periphery of the moving grinding disc, and a motor for driving the moving grinding disc to rotate.

[0010] The bean hopper assembly and the bean grinding assembly of the bean grinding device are assembled as one unit, so that the whole consisting of the bean hopper assembly and the bean grinding assembly can be detachably installed in the mounting cavity.

[0011] By assembling the bean hopper assembly and the grinding assembly into one unit and installing them as a whole into the mounting cavity formed by the machine casing, the disassembly and assembly steps are simplified, making it easy to disassemble and assemble the grinding device for subsequent replacement, maintenance, cleaning, etc.

[0012] The technical solution adopted by this utility model to solve the second technical problem mentioned above is as follows: the bean hopper assembly includes a hollow outer shell with openings at both the top and bottom, the motor extends at least partially into the outer shell from top to bottom, the stationary grinding disc is at least partially located in the outer shell, the portion of the outer shell above the stationary grinding disc constitutes the bean hopper, the stationary grinding disc and the moving grinding disc form a bean grinding space and the bean grinding space is connected to the bean hopper.

[0013] By mounting the motor from top to bottom into the housing, with the bean hopper formed inside the housing, no additional space is needed inside the housing to install the motor, which facilitates the miniaturization of the coffee machine. Furthermore, the stationary and moving grinding discs are located below the bean hopper, and the motor's output shaft extends from top to bottom to the moving grinding disc. After the grinding unit is removed, the grinding discs and the powder dispensing area can be easily cleaned even with coffee beans inside the housing.

[0014] To facilitate locking of the grinding device to the housing after installation in the mounting cavity, the bean hopper assembly further includes a mounting base. The mounting base includes a first base extending at least partially into the housing from top to bottom and a second base extending downward from the first base. The outer peripheral wall of the first base is provided with a locking bead that passes through the housing and can lock to the wall of the housing forming the mounting cavity. The second base is used to install the motor.

[0015] To facilitate locking and unlocking of the mounting base and the housing, the first base is rotatably supported on the outer housing. A track groove is formed on the outer peripheral wall of the first base, extending circumferentially along the first base. The track groove includes a first groove formed at one end in the circumferential direction, and the remaining part of the track groove forms a second groove. The recess depth of the first groove is greater than that of the second groove. The locking ball can slide along the track groove. A through hole is provided on the outer housing for the locking ball to pass through. A locking groove is provided on the wall of the housing forming the mounting cavity to cooperate with the locking ball. When the mounting base rotates to the point where the locking ball corresponds to the first groove, the locking ball disengages from the locking groove. When the mounting base rotates to the point where the locking ball corresponds to the second groove, the locking ball engages with the locking groove, thereby locking the grinding device to the housing.

[0016] To facilitate adjustment of the coarseness of the ground coffee powder as needed, the mounting base also includes a mounting post extending downward from the bottom surface of the second base. The mounting post is connected to the stationary grinding disc, allowing the stationary grinding disc to rotate with the mounting base, thereby changing the distance between the stationary grinding disc and the moving grinding disc by moving it up and down relative to the outer shell.

[0017] Furthermore, since the stationary grinding disc is located below the bean hopper and cannot be contacted when installed, the mounting base and the stationary grinding disc are connected by a mounting post. This allows the position of the stationary grinding disc to be easily adjusted by rotating the mounting base. A guide block is provided on the inner peripheral wall of the outer shell, and a guide groove is formed on the outer peripheral wall of the stationary grinding disc. The guide groove extends spirally along the circumference of the stationary grinding disc. The guide block and the guide groove are slidably engaged. The mounting post is sleeved with the stationary grinding disc, allowing the mounting base and the stationary grinding disc to move up and down relative to each other.

[0018] To facilitate maintaining the position of the motor, a positioning post is also formed inside the outer casing. The positioning post is hollow with openings at both the top and bottom. The upper end of the positioning post extends into the lower end of the second base, and the second base is rotatably supported on the outer periphery of the positioning post.

[0019] Furthermore, since the motor is detachable as a whole, a first electrical coupler electrically connected to the motor is provided on the outer casing to facilitate power supply to the motor, and a second electrical coupler electrically connected to the power supply of the coffee machine is provided on the wall surface of the mounting cavity of the casing.

[0020] Furthermore, to facilitate the operation of the mounting base, the bean hopper assembly also includes an upper cover disposed on the mounting base. The upper cover rotates synchronously with the mounting base, and both the upper cover and the mounting base are hollowed out.

[0021] Furthermore, the grinding assembly also includes a first electrical coupler electrically connected to the motor, and a second electrical coupler electrically connected to the power supply of the coffee machine is provided on the wall of the mounting cavity of the housing. Since the motor is detachable as part of the whole assembly, the electrical coupler allows for convenient power supply to the motor during installation.

[0022] Compared with the prior art, the advantages of this utility model are as follows: by assembling the bean hopper assembly and the grinding assembly into one unit and installing them as a whole into the mounting cavity formed by the machine housing, the disassembly and assembly steps are simplified, and the grinding device can be easily disassembled and assembled for subsequent replacement, maintenance, cleaning, etc.; by installing the motor from top to bottom into the outer housing, and forming the bean hopper inside the outer housing, no additional space is needed inside the machine housing to install the motor, which is conducive to the miniaturization of the coffee machine. Moreover, the stationary grinding disc and the moving grinding disc are located below the bean hopper, and the output shaft of the motor extends from top to bottom to the moving grinding disc. After the grinding device is removed, the grinding discs and the powder outlet can be easily cleaned even when coffee beans are still inside the outer housing. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a coffee machine according to an embodiment of the present utility model;

[0024] Figure 2 This is an exploded view of the coffee machine according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the hidden top cover and grinding device of the coffee machine according to an embodiment of the present invention;

[0026] Figure 4 This is a cross-sectional view of the coffee machine according to an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the coffee grinding device of a coffee machine according to an embodiment of the present invention;

[0028] Figure 6 This is a cross-sectional view of the coffee grinding device of the coffee machine according to an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the hidden housing of the coffee grinding device in an embodiment of the present invention.

[0030] Figure 8 This is a cross-sectional view of the outer casing of the coffee grinding device of an embodiment of the present invention;

[0031] Figure 9 This is an exploded view of the coffee grinding device of a coffee machine according to an embodiment of the present invention. Detailed Implementation

[0032] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0033] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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. Since the embodiments disclosed in this utility model can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0034] See Figures 1-9 A coffee machine, comprising a casing 1, a grinding device 2, a water tank 3, a water pump 4, a heating device 5, an extraction chamber 6, and a battery 7.

[0035] The housing 1 can be divided into an upper housing 11 and a lower housing 12. The upper housing 11 can rotate relative to the lower housing 12 around a vertical axis. The way they work together can be found in the applicant's Chinese patent application number 202011320050.X. The extraction box 6 is installed on the upper housing 11. When not in use, the upper housing 11 corresponds to the lower housing 12, and the extraction box 6 is positioned above the lower housing 12. When in use, the upper housing 11 can be rotated relative to the lower housing 12, so that the extraction box 6 is no longer aligned with the lower housing 12 and is suspended, allowing coffee to be extracted and collected in a coffee cup or other container. The water tank 3, water pump 4, and heating device 5 are all located inside the housing 1. The water tank 3 is at least partially located inside the lower housing 12 and can be detached relative to the lower housing 12. It stores water for coffee extraction. The water pump 4 pumps water from the water tank 3 to the heating device 5, which heats the water and supplies hot water to the extraction box 6 for coffee extraction. The above structure can be achieved using existing technologies, and will not be described in detail here.

[0036] The coffee machine also includes a control panel 8, which controls the operation of the water pump 4 and the heating device 5, and allows for selection of coffee flavors, etc.

[0037] The water pump 4, control panel 8, and motor 221 of the grinder assembly described below can be powered by battery 7, making it portable and suitable for outdoor use. Alternatively, it can be powered by AC mains power; or, either battery 7 or AC mains power can be used for power supply.

[0038] The grinding device 2 includes a bean hopper assembly and a grinding assembly. The upper housing 11 of the casing 1 has a mounting cavity 13, the top of which is open. The grinding device 2 can be installed into the mounting cavity 13 from the top. The casing 1 also includes a top cover 14, which can be closed onto the top opening of the mounting cavity 13 after the grinding device 2 is installed.

[0039] For ease of description, directional terms such as "upper" and "lower" in the following description refer to the orientation in the installed and used state. The bean hopper assembly includes a mounting base 211, an outer shell 212, and a top cover 213. The outer shell 212 is a hollow shell with openings at both the top and bottom. The outer shell 212 is used to hold coffee beans. The shape of the mounting cavity 13 is adapted to the outer shell 212. The mounting base 211 extends at least partially into the outer shell 212 from the upper opening. The mounting base 211 includes a first seat 2111 adapted to the outer shell 212, a second seat 2112 extending downward from the first seat 2111, and a mounting post 2113 extending downward from the bottom of the first seat 2111. In this embodiment, the mating portions of the outer shell 212 and the first seat 2111 of the mounting base 211 are generally cylindrical. The top cover 213 is located on the top of the mounting base 211. Both the top cover 213 and the first seat 2111 of the mounting base 211 are hollow, and the hollow positions are preferably corresponding so that coffee beans can be loaded into the outer shell 212 from the top.

[0040] The first seat 2111 is located on top of the outer shell 212 and is rotatably supported on the upper end of the outer shell 212. In this embodiment, the second seat 2112 of the mounting base 211 is cylindrical, extending downward from the middle of the first seat 2111, and the second seat 2112 is also open at both the top and bottom. Mounting posts 2113 can be arranged at intervals with the second seat 2112, and there can be multiple posts. A positioning post 215 is also formed inside the outer shell 212, which is hollow with open at both the top and bottom. The positioning post 215 is preferably integrally formed with the outer shell 212, and a connecting post or the like can be provided between them so that the positioning post 215 is located inside the outer shell 212 without directly contacting the outer shell 212. The upper end of the positioning post 215 can extend into the lower end of the second seat 2112, and the second seat 2112 is rotatably supported on the outer periphery of the positioning post 215. The top cover 213 and the mounting base 211 can rotate synchronously relative to the outer casing 212 about a vertically extending axis.

[0041] The inner peripheral wall of the outer shell 212 and the outer peripheral wall of the first base 2111 are close to each other, almost touching. A track groove 2114 is formed on the outer peripheral wall of the first base 2111, extending circumferentially along the first base 2111. Multiple track grooves 2114 may be present, arranged at intervals along the circumferential direction. Each track groove 2114 includes a first groove 21141 formed at one end in the circumferential direction, and the remaining portion of the track groove 2114 forms a second groove 21142. The depth of the first groove 21141 is greater than that of the second groove 21142. A through hole 2121 is provided on the outer shell 212, its height corresponding to the track groove 2114. The bean hopper assembly also includes a locking bead 214, which is spherical and can slide along the track groove 2114. The locking bead 214 at least partially penetrates the through hole 2121. The upper housing 11 has a locking groove 15 formed on the wall surface that forms the mounting cavity 13.

[0042] Before installation, the locking bead 214 is placed in the first groove 21141 of the track groove 2114 and passes through the through hole 2121 of the outer shell 212. Then, the grinding device 2 is placed into the mounting cavity 13 of the housing 1, so that the through hole 2121 is aligned with the locking groove 15. Then, by applying force to the top cover 213, the mounting base 211 rotates relative to the outer shell 212 around the vertically extending axis. When the mounting base 211 rotates, since the locking bead 214 does not rotate with it, the locking bead 214 no longer corresponds to the first groove 21141. Instead, the mounting base 211 rotates so that the second groove 21142 corresponds to the locking bead 214. Since the depth of the second groove 21142 is less than that of the first groove 21141, the locking bead 214 is pushed out of the outer shell 212 by the mounting base 211, so that the locking bead 214 is partially embedded in the locking groove 15 of the housing 1, thereby completing the locking installation of the grinding device 2 and the housing 1.

[0043] When it is necessary to disassemble the coffee grinder 2, rotate the top cover 213 and the mounting base 211 in the opposite direction, so that the track groove 2114 rotates relative to the locking ball 214 until the first groove 21141 of the track groove 2114 corresponds to the locking ball 214. When rotating, due to the pressure and friction applied to the locking ball 214 by the wall of the upper housing 11, the locking ball 214 retracts and exits the locking groove 15, no longer locking. At this time, the coffee grinder 2 can be disassembled from the housing 1.

[0044] The grinding assembly includes a motor 221, a moving grinding disc 222, a stationary grinding disc 223, and a powder sweeping component 224. The motor 221 is mounted on a mounting base 211 and passes through a second base 2112 of the mounting base 211. Its upper end can be inserted into the upper cover 213 of the bean hopper. The output shaft 2211 of the motor 221 extends downward through the second base 2112 and the positioning post 215. The moving grinding disc 222 is mounted below the positioning post 215. The moving grinding disc 222 can be shaped like a frustum, with a smaller top and a larger bottom. The stationary grinding disc 223 is located on the outer periphery of the moving grinding disc 222 and is at least partially located inside the outer casing 212 (partially located in the space below the outer casing 212). The bottom surface of the stationary grinding disc 223 is higher than the bottom surface of the moving grinding disc 222. The mounting post 2113 of the aforementioned mounting base 211 extends onto the stationary grinding disc 223 and is connected to the stationary grinding disc 223 so that they can rotate synchronously. For ease of assembly and disassembly, the mounting post 2113 and the stationary grinding disc 223 can be connected by an upper and lower sleeve connection. The powder sweeping component 224 is located below the moving grinding disc 222. The aforementioned output shaft 2211 also passes through the moving grinding disc 222 and extends into the powder sweeping component 224, thereby enabling the motor 221 to drive the moving grinding disc 222 and the powder sweeping component 224 to rotate around a vertically extending axis.

[0045] The portion of the outer casing 212 located above the stationary grinding disc 223 forms the bean hopper. The grinding space between the stationary grinding disc 223 and the moving grinding disc 222 communicates with the bean hopper, allowing coffee beans to enter the grinding space from the hopper. The dust collector 224 is positioned below the stationary grinding disc 223. During grinding, the stationary grinding disc 223 remains stationary relative to the outer casing 212, while the moving grinding disc 222 rotates relative to the outer casing 212, thereby grinding the coffee beans into coffee powder. The rotation of the dust collector 224 allows the ground coffee powder to be quickly and as much as possible swept towards the powder outlet (not shown).

[0046] To facilitate adjustment of the coffee powder coarseness, a guide block 216 is provided on the inner peripheral wall of the outer casing 212, and a guide groove 2231 is formed on the outer peripheral wall of the stationary grinding disc 223, extending spirally along the circumference of the stationary grinding disc 223. The guide block 216 and the guide groove 2231 are in sliding engagement. During adjustment, force can be applied to the upper cover 213, causing the upper cover 213, the mounting base 211, and the stationary grinding disc 223 to rotate. Since the guide groove 2231 on the stationary grinding disc 223 is spiral, it can rise and fall relative to the outer casing 212 while rotating relative to it, thereby changing the distance between the lower end of the inner peripheral wall of the stationary grinding disc 223 and the corresponding height position of the outer peripheral wall of the moving grinding disc 222, thus changing the coarseness of the ground coffee powder. Because the mounting post 2113 is sleeved with the stationary grinding disc 223, the mounting base 211 and the stationary grinding disc 223 rotate synchronously but can have relative movement in the vertical direction. That is, during rotation, the mounting base 211 and the outer casing 212 only rotate relative to each other without vertical relative movement. In this embodiment, preferably, the finest powder grinding position is reached when the height difference between the bottom surface of the stationary grinding disc 223 and the bottom surface of the moving grinding disc 222 is 0.5mm, and the coarsest powder grinding position is reached when the height difference between the bottom surface of the stationary grinding disc 223 and the bottom surface of the moving grinding disc 222 is 1.2mm. During rotation, the locking ball 214 remains aligned with the second groove 21142 of the track groove 2114 of the mounting base 211.

[0047] When it is necessary to disassemble the grinding device 2, the position of the stationary grinding disc 223 can be adjusted so that the height difference between its bottom surface and the bottom surface of the moving grinding disc 222 is about 3mm, so as to facilitate cleaning of the moving grinding disc 222 and the grinding space.

[0048] In this embodiment, by making the moving grinding disc 222 as a whole frustum, the distance between the inner peripheral wall of the stationary grinding disc 223 and the moving grinding disc 222 can be changed when the vertical position of the stationary grinding disc 223 changes. Alternatively, the space enclosed by the inner peripheral wall of the stationary grinding disc 223 can also be frustum-shaped, while the moving grinding disc 222 can be cylindrical or other shapes. The moving grinding disc 222 and the stationary grinding disc 223 can also be other shapes, as long as the distance between the stationary grinding disc 223 and the moving grinding disc 222 can be changed when the stationary grinding disc 223 moves up and down.

[0049] Since the motor 221 and the bean hopper assembly are installed as a single unit, a first electrical coupler 225 (electrically connected to the motor 221) is also provided on the outer casing 212, and a second electrical coupler 16 (electrically connected to the battery 7 or mains power supply) is provided on the wall of the mounting cavity 13 of the housing 1. Thus, when the grinding device 2 is installed into the housing 1, the first electrical coupler 225 and the second electrical coupler 16 couple, achieving both electrical and mechanical connection, thereby allowing the battery 7 or mains power supply to power the motor 221. In this embodiment, the first electrical coupler 225 and the second electrical coupler 16 can be plugged in to achieve both electrical and mechanical connection. This connection also allows for the positioning of the outer casing 212 of the bean hopper assembly during installation, facilitating the alignment of its through-hole 2121 with the locking groove 15 of the housing 1. Subsequently, the grinding device 2 and the housing 1 can be easily locked by rotating the mounting base 211.

Claims

1. A coffee machine, comprising a housing (1) and a grinding device (2), the grinding device (2) comprising a bean hopper assembly and a grinding assembly, the housing (1) comprising a mounting cavity (13) having an open top, characterized in that: The grinding assembly includes a moving grinding disc (222), stationary grinding discs (223) spaced apart on the outer periphery of the moving grinding disc (222), and a motor (221) for driving the moving grinding disc (222) to rotate; The bean hopper assembly and the bean grinding assembly of the bean grinding device (2) are assembled into one unit, so that the whole consisting of the bean hopper assembly and the bean grinding assembly can be detachably installed in the mounting cavity (13).

2. The coffee machine according to claim 1, characterized in that: The bean hopper assembly includes a hollow outer shell (212) with openings at both the top and bottom. The motor (221) extends at least partially into the outer shell (212) from top to bottom. The stationary grinding disc (223) is at least partially located inside the outer shell (212). The portion of the outer shell (212) above the stationary grinding disc (223) constitutes the bean hopper. The stationary grinding disc (223) and the moving grinding disc (222) form a bean grinding space, and this bean grinding space is connected to the bean hopper.

3. The coffee machine according to claim 2, characterized in that: The bean hopper assembly also includes a mounting base (211), which includes a first base (2111) extending at least partially into the outer shell (212) from top to bottom and a second base (2112) extending downward from the first base (2111). The outer peripheral wall of the first base (2111) is provided with a locking bead (214) that passes through the outer shell (212) and can be locked with the wall of the housing (1) forming the mounting cavity (13). The second base (2112) is used to mount the motor (221).

4. The coffee machine according to claim 3, characterized in that: The first seat (2111) is rotatably supported on the outer shell (212). A track groove (2114) is formed on the outer peripheral wall of the first seat (2111). The track groove (2114) extends circumferentially along the first seat (2111). The track groove (2114) includes a first groove (21141) formed at one end in the circumferential direction, and the remaining part of the track groove (2114) constitutes a second groove (21142). The recess depth of the first groove (21141) is greater than that of the second groove (21142). The locking ball (214) can move along the track groove (2111). 4) Sliding: The outer shell (212) has a through hole (2121) for the locking ball (214) to pass through. The wall of the mounting cavity (13) of the housing (1) has a locking groove (15) that cooperates with the locking ball (214). When the mounting base (211) rotates to the point where the locking ball (214) corresponds to the first groove (21141), the locking ball (214) exits the locking groove (15). When the mounting base (211) rotates to the point where the locking ball (214) corresponds to the second groove (21142), the locking ball (214) is embedded in the locking groove (15) so that the grinding device (2) is locked to the housing (1).

5. The coffee machine according to claim 3, characterized in that: The mounting base (211) also includes a mounting post (2113) extending downward from the bottom surface of the second base body (2112). The mounting post (2113) is connected to the stationary grinding disc (223) so that the stationary grinding disc (223) can rotate with the mounting base (211), thereby the stationary grinding disc (223) moves up and down relative to the outer shell (212) and changes the distance between it and the moving grinding disc (222).

6. The coffee machine according to claim 5, characterized in that: A guide block (216) is provided on the inner peripheral wall of the outer shell (212), and a guide groove (2231) is formed on the outer peripheral wall of the stationary grinding disc (223). The guide groove (2231) extends spirally along the circumference of the stationary grinding disc (223). The guide block (216) and the guide groove (2231) are slidably engaged. The mounting post (2113) is sleeved with the stationary grinding disc (223) so that the mounting base (211) and the stationary grinding disc (223) can move up and down relative to each other.

7. The coffee machine according to claim 3, characterized in that: A positioning post (215) is also formed inside the outer shell (212). The positioning post (215) is hollow with openings at both the top and bottom. The upper end of the positioning post (215) extends into the lower end of the second seat (2112). The second seat (2112) is rotatably supported on the outer periphery of the positioning post (215).

8. The coffee machine according to claim 2, characterized in that: The outer casing (212) is also provided with a first electrical coupler (225) that is electrically connected to the motor (221), and a second electrical coupler (16) that is electrically connected to the power supply of the coffee machine is provided on the wall of the mounting cavity (13) of the housing (1).

9. The coffee machine according to claim 2, characterized in that: The bean hopper assembly also includes an upper cover (213) disposed on the mounting base (211). The upper cover (213) rotates synchronously with the mounting base (211), and both the upper cover (213) and the mounting base (211) are hollow.

10. The coffee machine according to claim 1, characterized in that: The coffee grinding assembly also includes a first electrical coupler (225) electrically connected to the motor (221), and a second electrical coupler (16) electrically connected to the power supply of the coffee machine is provided on the wall of the mounting cavity (13) of the housing (1).

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