CN117064221A - Grinding device for coffee machine and coffee machine - Google Patents

Abstract

The invention relates to a grinding device for a coffee machine and the coffee machine, comprising: a milling chamber; the grinding assembly comprises an inner grinding core capable of rotating around the axis of the grinding assembly and an outer grinding core sleeved outside the inner grinding core, and an annular grinding gap is formed between the outer grinding core and the inner grinding core; the first driving mechanism comprises a first driving motor and an adjusting disc, an output shaft of the first driving motor is in transmission connection with the adjusting disc, so that the adjusting disc is driven to rotate around the axis of the adjusting disc, and a transmission piece for converting the rotation motion of the adjusting disc into the up-and-down motion of the outer grinding core is arranged between the adjusting disc and the outer grinding core; the coffee machine further comprises an angle detection device for detecting the rotating angle of the adjusting disc from the initial position, the angle detection device is electrically connected with a controller of the coffee machine, and the controller can control the first driving motor to be started and stopped according to the rotating angle signal of the adjusting disc conveyed by the angle detection device. Can provide more grinding gear adjustment and meet finer grinding thickness requirements.

Description

Grinding device for coffee machine and coffee machine

Technical Field

The invention relates to the technical field of coffee machines, in particular to a grinding device for a coffee machine and the coffee machine.

Background

The spacing between cutter heads of the bean grinder is manually adjusted according to the actual extraction condition before the coffee machine in the current market is used, and the particle size and the shape distribution of the coffee powder are determined, so that the coffee beverage meeting the requirements is extracted. The method for adjusting the spacing of the bean grinding cutterhead sets mainly comprises the step of manually rotating an adjusting knob to adjust the spacing of the bean grinding cutterhead sets. However, this manual operation is relatively time-consuming and labor-consuming.

For this reason, there are also related technologies for adjusting the distance between the grinding cutterhead sets by using an electric control device to realize electric adjustment of the thickness of the coffee powder, for example, chinese patent application publication No. CN202010168601.9 (publication No. CN 113384145A) discloses such a grinding device, which specifically includes a grinding unit including a grinding cutterhead and an adjusting disc, and an adjusting motor of the particle size adjusting mechanism is connected to the adjusting disc via a gear fluted disc transmission assembly and moves the adjusting disc to change the distance between the adjusting disc and the grinding cutterhead.

However, the grinding device of the coffee machine has a certain disadvantage, and the grinding device drives the adjusting disc to move through the motor to adjust the grinding gap, but the gear which can be selected by the user is relatively less (generally, the grinding device is only in coarse, medium and fine gear modes), so that the grinding device cannot meet the requirements of finer grinding thickness, and the use experience of the user is reduced.

Disclosure of Invention

The first technical problem to be solved by the invention is to provide a grinding device for a coffee machine, which can provide more grinding gear adjustment and meet the finer grinding thickness requirement.

The second technical problem to be solved by the invention is to provide a coffee machine applying the grinding device aiming at the current state of the art.

The technical scheme adopted by the invention for solving the first technical problem is as follows: a grinding device for a coffee machine, comprising:

a milling chamber;

the grinding assembly is arranged in the grinding cavity and comprises an inner grinding core capable of rotating around the axis of the grinding assembly and an outer grinding core sleeved outside the inner grinding core, an annular grinding gap is formed between the outer grinding core and the inner grinding core, and the outer grinding core can move up and down relative to the inner grinding core under the drive of the first driving mechanism, so that the size of the grinding gap is changed;

the first driving mechanism comprises a first driving motor and an adjusting disc which is arranged on the periphery of the outer grinding core and can rotate around the axis of the outer grinding core, an output shaft of the first driving motor is in transmission connection with the adjusting disc so as to drive the adjusting disc to rotate around the axis of the outer grinding core, and a transmission piece which is used for converting the rotation movement of the adjusting disc into the up-and-down movement of the outer grinding core is further arranged between the adjusting disc and the outer grinding core;

the coffee machine is characterized by further comprising an angle detection device for detecting the rotating angle of the adjusting disc from the initial position, wherein the angle detection device is electrically connected with a controller of the coffee machine, and the controller can control the first driving motor to be started and stopped according to the rotating angle signal of the adjusting disc conveyed by the angle detection device.

As an improvement, different angles through which the adjusting disk rotates correspond to gears of the coffee machine for reflecting grinding gaps with different sizes of the grinding assembly, and the rotating angle of the adjusting disk detected by the angle detection device is recorded as a first angle signal;

when the first angle signal is consistent with preset gear information, the controller controls the first driving motor to be not operated;

when the first angle signal is inconsistent with the preset gear information, the controller controls the first driving motor to rotate forward or reversely until the first angle signal fed back by the angle detection device is consistent with the preset gear information.

In order to simplify the structure of the angle detection device and ensure the detection accuracy, through holes which are sequentially arranged along the circumferential direction of the adjusting disc and are vertically communicated are formed in the adjusting disc, and the angle detection device is an infrared detection device for identifying the number of the through holes in the rotating process of the adjusting disc from the initial position.

As an improvement, the infrared detection device comprises a transmitter for transmitting infrared signals and a receiver for receiving the infrared signals, wherein the transmitter and the receiver are respectively arranged on the upper side and the lower side of the adjusting disc and are opposite to the corresponding through holes on the adjusting disc in the up-down direction.

In order to accurately position the initial position of the adjusting disk, the device also comprises a micro switch for identifying whether the adjusting disk rotates to the initial position. After the micro switch is added, the initial position of the adjusting disc can be positioned, and the clamping of the finest gear due to too tight distance is prevented.

As an improvement, the number of through holes on the adjusting disk is more than 3. It will be appreciated that when the number of through holes in the adjustment plate is sufficiently large, an infinite adjustment of the grinding gap can be achieved theoretically, meeting the finer mill fineness requirement to the greatest extent.

In order to convert the rotary motion of the adjusting disk into the up-and-down motion of the outer grinding core, the adjusting disk is rotationally restrained on the outer peripheral wall of the grinding chamber and is restrained from moving in the up-and-down direction relative to the grinding chamber;

the inner side of the adjusting disc is also provided with an adjusting cylinder, the outer wall of the adjusting cylinder is in threaded connection with the inner wall of the adjusting disc, and the adjusting cylinder is restrained on the grinding chamber in an up-down movable mode and is restrained from rotating relative to the grinding chamber in the circumferential direction;

the outer grinding core is connected with the adjusting cylinder and can move up and down along with the adjusting cylinder;

the adjusting cylinder forms the transmission part.

In order to limit the rotation of the adjusting cylinder, the grinding chamber is provided with a limiting slot which extends vertically, and the adjusting cylinder is provided with an inserting arm which extends vertically and is inserted into the limiting inserting hole.

In order to connect the outer grinding core with the adjusting cylinder, the grinding machine further comprises a mounting sleeve for the outer grinding core to be installed in, and the mounting sleeve is connected to the inner wall of the adjusting cylinder in a rotary clamping manner.

In order to realize the connection of the installation sleeve and the outer grinding core, the installation sleeve is provided with an elastic buckle capable of elastically deforming in the radial direction, the top of the outer grinding core is provided with a limiting stop edge extending outwards in the radial direction, and the elastic buckle of the installation sleeve is limited below the limiting stop edge of the outer grinding core when the outer grinding core is installed in the installation sleeve.

In order to realize the transmission connection between the first driving motor and the adjusting disk, a circle of transmission tooth parts are arranged at the peripheral edge of the adjusting disk, and an output shaft of the first driving motor is in transmission connection with the transmission tooth parts of the adjusting disk through a gear transmission assembly.

The invention solves the second technical problem by adopting the technical proposal that: a coffee machine comprises a grinding device, wherein the grinding device is used for the coffee machine.

Compared with the prior art, the invention has the advantages that: the angle detection device of the grinding device can detect the rotating angle of the adjusting disc (from the initial position of the adjusting disc), and when the adjusting disc is positioned at different rotating angles, the grinding gap of the grinding assembly is different, so that the rotating angle of the adjusting disc can be used as gear information for controlling the grinding gap, and the coffee machine can provide more grinding gear adjustment, and meets the finer grinding thickness requirements of users.

Drawings

Fig. 1 is a schematic perspective view of a grinding device for a coffee machine according to an embodiment of the present invention;

FIG. 2 is a top view of a pulverizing apparatus for a coffee machine according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along the line A-A in FIG. 2;

FIG. 4 is a schematic perspective view of an outer core assembly according to an embodiment of the present invention;

FIG. 5 is a cross-sectional perspective view of an outer core assembly according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of an abrasive assembly according to an embodiment of the present disclosure;

FIG. 7 is a schematic perspective view of an adjusting cylinder according to an embodiment of the present invention;

FIG. 8 is a schematic view of another angle perspective of an adjustment cylinder according to an embodiment of the present invention;

FIG. 9 is a schematic perspective view of the outer core assembly, adjustment plate, adjustment barrel, etc. of FIG. 1;

fig. 10 is a schematic perspective view of a grinding device for coffee machine according to another embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the embodiments of the drawings.

In the description and claims of the present invention, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used to describe various example structural parts and elements of the present invention, but these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the invention may be arranged in a variety of orientations, the directional terminology is used for purposes of illustration and is in no way limiting, such as "upper" and "lower" are not necessarily limited to being in a direction opposite or coincident with the direction of gravity.

Referring to fig. 1 to 10, a pulverizing apparatus for a coffee maker includes a pulverizing chamber 10, a pulverizing assembly, a first driving mechanism, a second driving mechanism, and an angle detecting device 40.

The grinding chamber 10 is defined in a mounting block to which the above-described first and second drive mechanisms, the angle detecting device 40, etc. can be mounted, thereby forming a modular structure for easy mounting to the body of the coffee maker. Specifically, the mounting base defines a grinding chamber 10 at an upper portion thereof and a mounting chamber 100 in which a transmission member of the second driving mechanism is placed at a lower portion thereof, the grinding chamber 10 having an opening therethrough to the mounting chamber 100, and a second transmission shaft 352 rotated by the second driving mechanism extending into the grinding chamber 10 through the opening to be connected to the inner core 21 of the grinding assembly. The second driving mechanism of the present embodiment includes a second driving motor 14, and the second driving motor 14 is connected to a second transmission shaft 352 through a corresponding toothed disc transmission assembly (not shown), so as to drive the second transmission shaft 352 to rotate around its own axis.

Referring to fig. 3, the grinding assembly is provided in the grinding chamber 10, and specifically includes an inner grinding core 21 rotatable about its own axis and an outer grinding core 22 sleeved outside the inner grinding core 21, wherein an annular grinding gap 24 is formed between the outer grinding core 22 and the inner grinding core 21. As shown in fig. 6, the inner core 21 has a tapered structure with a diameter gradually increasing from top to bottom, and correspondingly, the region (specifically, the lower region) corresponding to the inner core 21 on the inner peripheral wall of the outer core 22 has a tapered hole structure adapted thereto. The upper region of the inner peripheral wall of the outer grinding core 22 is inclined toward the center position of the outer grinding core 22 from top to bottom, whereby a storage space for easy stock is also correspondingly formed between the upper region of the inner peripheral wall of the outer grinding core 22 and the outer peripheral wall of the inner grinding core 21. The outer grinding core 22 of this embodiment can move up and down relative to the inner grinding core 21 under the drive of the first driving mechanism, so as to change the size of the grinding gap 24. The grinding gap 24 increases as the outer core 22 moves upward and the grinding gap 24 decreases as the outer core 22 moves downward.

The outer core 22 of this embodiment is removably placed into the milling chamber 10. Specifically, an adjustment cylinder 37 is also provided in the grinding chamber 10, which adjustment cylinder 37 is arranged at the periphery of the outer grinding core 22. The outer core 22 is connected to the inner wall of the adjustment cylinder 37 by means of a mounting sleeve 23 connected to the upper part thereof. Still more specifically, the adjustment cylinder 37 of the present embodiment is capable of moving up and down relative to the grinding chamber 10 without rotating, wherein the grinding chamber 10 has a stopper slot 11 extending downward from the top thereof, and the adjustment cylinder 37 has a stopper arm 371 extending vertically to be inserted into the stopper slot. The limiting slots 11 of the grinding chamber 10 are arranged in opposite directions, and the inserting arms 371 on the adjusting cylinder 37 are correspondingly arranged in two directions.

The mounting sleeve 23 and the outer core 22 together form the outer core assembly of this embodiment. In order to achieve convenient installation of the mounting sleeve 23 and the outer grinding core 22, the lower part of the mounting sleeve 23 is provided with elastic buckles 230 which can elastically deform in the radial direction, wherein the elastic buckles 230 are symmetrically arranged, and the top of the outer grinding core 22 is provided with a limit stop edge 220 which extends outwards in the radial direction. The outer core 22 can be fitted into the mounting sleeve 23 from below and with the outer core 22 fitted into the mounting sleeve 23, the resilient snap fit 230 of the mounting sleeve 23 is retained under the retaining lip 220 of the outer core 22 while the top of the outer core 22 abuts against the radially inwardly extending annular lip on the mounting sleeve 23.

In order to facilitate the taking of the outer core assembly, a handle 231 is further provided at the top opening of the mounting sleeve 23, and after the outer core assembly is placed in place, the handle 231 is arranged at one side of the top opening of the mounting sleeve 23 in a deflectable manner.

The mounting sleeve 23 provided with the outer grinding core 22 of this embodiment may be connected to the inner wall of the adjustment cylinder 37 by means of a rotary clamping connection, for example, a first limiting protrusion 232 protruding outwards may be provided on the outer peripheral wall of the mounting sleeve 23, and a second limiting protrusion 372 protruding inwards in the radial direction may be provided on the inner peripheral wall of the adjustment cylinder 37, the mounting sleeve 23 rotates by a certain angle after being mounted into the adjustment cylinder 37, and the first limiting protrusion 232 on the mounting sleeve 23 may be limited below the second limiting protrusion 372 of the adjustment cylinder 37, thereby ensuring a firm mounting between the mounting sleeve 23 and the adjustment cylinder 37.

The outer core 22 can move up and down with the adjustment cylinder 37 after being mounted to the adjustment cylinder 37. In order to drive the adjusting cylinder 37 to move up and down, the first driving mechanism comprises a first driving motor 31 and an adjusting disc 36, wherein the adjusting disc 36 is hollow and sleeved outside the adjusting cylinder 37. Specifically, the adjustment plate 36 includes a substantially vertically extending annular wall 363 and an annular plate 364 extending radially outwardly from the annular wall 363, with the drive teeth 362 provided at an outer peripheral edge of the annular plate 364. The annular wall 363 of the adjustment plate 36 is rotationally restrained on the grinding chamber 10, and more specifically, the top of the peripheral wall of the grinding chamber 10 is provided with a limit chute 13 surrounding the grinding chamber 10 for one circle, the bottom open edge of the annular wall of the adjustment plate 36 is provided with an inwardly extending convex edge 3630, and the adjustment plate 36 is slidingly restrained in the limit chute 13 through the convex edge 3630, thereby realizing the rotation of the adjustment plate 36 relative to the grinding chamber 10 and the limitation in the up-down direction. The limit chute 13 on the grinding chamber 10 is defined by an annular step provided at the top of the grinding chamber 10 and an annular pressing plate 12 fitted on the annular step, and the pressing plates 12 may be connected to the top of the grinding chamber 10 by screws sequentially arranged in the circumferential direction.

The annular wall of the adjusting disc 36 and the outer peripheral wall of the adjusting drum 37 are in threaded connection, and when the adjusting disc 36 is driven to rotate by the first driving mechanism, the adjusting drum 37 can not rotate relative to the grinding chamber 10, so that the adjusting drum 37 can only move upwards or downwards under the driving of the adjusting disc 36. The adjustment cylinder 37 described above thus constitutes a transmission for converting the rotary movement of the adjustment disk 36 into an upward and downward movement of the outer grinding core 22.

An important invention point of this embodiment is: the grinding device further comprises an angle detection device 40 for detecting the angle of rotation of the adjustment plate 36 from its initial position, which can detect the angle of rotation of the adjustment plate 36 (from its initial position), and the grinding gap 24 of the grinding assembly is different when the adjustment plate 36 is at different rotation angles, whereby the rotation angle of the adjustment plate 36 can be used as gear information for controlling the size of the grinding gap 24, so that the coffee machine provides more grinding gear adjustments, and meets the finer grinding thickness requirements of the user.

Specifically, the angle detecting device 40 of the present embodiment is preferably an infrared detecting device, in which through holes 361 are sequentially arranged along the circumferential direction of the annular disc of the adjusting disc 36 and vertically penetrating, and the infrared detecting device can identify the number of the through holes 361 in the rotation process of the adjusting disc 36 from the initial position. Specifically, the infrared detection device can transmit a light-dark alternating signal generated by rotation of a circle of through holes 361 which are uniformly distributed at 360 degrees on the adjusting disc 36 of the grinding device to the controller, and the controller controls the grinding motor to rotate reversely through the signal feedback to adjust the thickness of the grinding gear. The infrared detection device specifically includes a transmitter 41 for transmitting an infrared signal and a receiver 42 for receiving the infrared signal, where the transmitter 41 and the receiver 42 are respectively disposed on the upper and lower sides of the annular disk of the adjusting disk 36 and are opposite to the corresponding through hole 361 on the adjusting disk 36 in the up-down direction. The number of through holes 361 can be reasonably designed according to actual gear requirements, and in general, the number of through holes 361 on the adjusting disk 36 should be greater than 3, that is, the grinding gap 24 gear adjustment of the grinding assembly is greater than three gears. It will be appreciated that when the number of through holes 361 in the adjustment plate 36 is sufficiently large, an infinite adjustment of the grinding gap 24 can theoretically be achieved, meeting more careful mill fineness requirements to the greatest extent.

The different angles (i.e. different numbers of through holes 361) rotated by the adjusting disk 36 in the embodiment correspond to the gears of the coffee machine for reflecting the grinding gaps 24 with different sizes of the grinding components, wherein the rotation angle of the adjusting disk 36 detected by the angle detecting device 40 is recorded as a first angle signal, and when the first angle signal is consistent with the preset gear information, the controller controls the first driving motor 31 to be inactive; when the first angle signal is inconsistent with the preset gear information, the controller controls the first driving motor 31 to rotate forward or rotate backward until the first angle signal fed back by the angle detecting device 40 is consistent with the preset gear information. In the following, the setting of 36 through holes 361 on the adjusting plate 36 is exemplified, and the initial grinding device of each coffee machine is set to be the coarsest grinding powder gear, that is, the adjusting plate 36 is located at the initial position, each rotation angle of the adjusting plate 36 is set to be one gear through one through hole 361, if 36 through holes 361 are formed on the adjusting plate 36, the corresponding 36 gears are set, wherein 0-12 gears (the number of 0-12 through holes 361 rotated from the initial position) are set to be coarse gears, 12-24 gears (the number of 12-24 through holes 361 rotated from the initial position) are set to be medium gears, and 24-36 gears (the number of 24-36 through holes 361 rotated from the initial position) are set to be fine gears. The thickness can be automatically adjusted to corresponding values by clicking the required coffee products, and the thickness can be manually adjusted by clicking addition and subtraction (control touch keys on an operation screen). The more the number of through holes 361 in the adjusting disk 36, the more the light-dark alternating frequency is dense, the more the adjustable gears are, and the thickness can be theoretically adjusted infinitely. The coarser the coffee grounds, the lower the pressure required for brewing, the finer the coffee grounds, the greater the pressure required for brewing, and the higher the coffee strength produced. The same gear corresponds to different coffee beans, the ground coffee powder has slight difference in thickness, after long-time work, the blade group of the grinding assembly also has abrasion conditions, the gap between the inner grinding core and the outer grinding core 22 is increased, at this time, a user can adjust proper thickness according to the self requirement, and a cup of required coffee beverage is brewed.

In addition, referring to fig. 10, a micro switch 51 is further disposed at the top of the grinding chamber 10, the micro switch 51 is electrically connected to the controller, the micro switch 51 is disposed adjacent to the adjusting disk 36, wherein a stop 367 extending radially outwards is disposed on the adjusting disk 36, when the adjusting disk 36 rotates to an initial position, the stop 367 on the adjusting disk 36 can trigger a triggering portion of the micro switch 51, and the controller controls the first driving mechanism to stop acting, so that the adjusting disk 36 can be positioned to rotate (reset to the initial position) to prevent the grinding assembly from being blocked at the finest gear due to too tight distance.

The first driving mechanism comprises a first driving motor 31 and a gear transmission assembly, wherein the first driving motor 31 is fixed relative to the grinding chamber 10, the gear transmission assembly comprises a first gear 32, a second gear 33 and a third gear 34, and the first gear 32 is coaxially connected to an output shaft of the first driving motor 31 and can rotate along with the output shaft of the first driving motor 31. The second gear 33 is coaxially connected to the third gear 34 via a first drive shaft 351, wherein the first drive shaft 351 is rotatably connected to the milling chamber 10, the second gear 33 meshes with the first gear 32, and the third gear 34 meshes with the drive teeth 362 of the adjustment disk 36. When the first driving motor 31 rotates forward and backward, power is transmitted to the adjusting disk 36 through the gear transmission assembly to drive the adjusting disk 36 to rotate, the adjusting disk 36 and the adjusting cylinder 37 are assembled through threads, the adjusting disk 36 only rotates and does not move up and down, the adjusting cylinder 37 is driven to move up and down through threaded rotation, the adjusting cylinder 37 drives the outer grinding core 22 to move up and down so as to adjust the grinding gap 24 between the inner grinding core and the outer grinding core, and the larger the grinding gap 24 is, the coarser the ground coffee powder is, and the finer the ground coffee powder is.

Of course, it is conceivable that the above gear assembly may be simplified in order to make the structure of the pulverizing apparatus more compact, and as shown in fig. 10, the gear assembly includes only the first gear 32 provided on the output shaft of the first driving motor 31, and the first gear 32 is directly engaged with the driving teeth 362 of the adjusting disk 36.

The embodiment also relates to a coffee machine, and the machine body of the coffee machine is provided with the grinding device.

Claims (10)

1. A grinding device for a coffee machine, comprising:

a milling chamber (10);

the grinding assembly is arranged in the grinding chamber (10) and comprises an inner grinding core (21) capable of rotating around the axis of the grinding assembly and an outer grinding core (22) sleeved outside the inner grinding core (21), a ring-shaped grinding gap (24) is formed between the outer grinding core (22) and the inner grinding core (21), and the outer grinding core (22) can move up and down relative to the inner grinding core (21) under the drive of the first driving mechanism, so that the size of the grinding gap (24) is changed;

the method is characterized in that: the first driving mechanism comprises a first driving motor (31) and an adjusting disc (36) which is arranged on the periphery of the outer grinding core (22) and can rotate around the axis of the outer grinding core, an output shaft of the first driving motor (31) is in transmission connection with the adjusting disc (36) so as to drive the adjusting disc (36) to rotate around the axis of the outer grinding core, and a transmission part which is used for converting the rotation movement of the adjusting disc (36) into the up-and-down movement of the outer grinding core (22) is arranged between the adjusting disc (36) and the outer grinding core (22);

the coffee machine further comprises an angle detection device (40) for detecting the angle rotated by the adjusting disc (36) from the initial position, the angle detection device (40) is electrically connected with a controller of the coffee machine, and the controller can control the first driving motor (31) to be started and stopped according to a rotation angle signal of the adjusting disc (36) conveyed by the angle detection device (40).

2. The grinding device for a coffee machine according to claim 1, wherein: the different angles through which the adjusting disk (36) rotates correspond to gears of the coffee machine for reflecting grinding gaps (24) with different sizes of the grinding assembly, and the rotating angle of the adjusting disk (36) detected by the angle detection device (40) is recorded as a first angle signal;

when the first angle signal is consistent with preset gear information, the controller controls the first driving motor (31) to be inactive;

when the first angle signal is inconsistent with the preset gear information, the controller controls the first driving motor (31) to rotate forwards or reversely until the first angle signal fed back by the angle detection device (40) is consistent with the preset gear information.

3. A grinding device for a coffee machine according to claim 2, characterized in that: the angle detection device (40) is an infrared detection device for identifying the number of through holes (361) in the rotation process of the adjusting disc (36) from the initial position.

4. A grinding device for coffee machines according to claim 3, characterized in that: the infrared detection device comprises a transmitter (41) for transmitting infrared signals and a receiver (42) for receiving the infrared signals, wherein the transmitter (41) and the receiver (42) are respectively arranged on the upper side and the lower side of the adjusting disc (36) and are opposite to corresponding through holes (361) on the adjusting disc (36) in the up-down direction.

5. A grinding device for coffee machines according to claim 3, characterized in that: the automatic control device also comprises a micro switch for identifying whether the adjusting disc rotates to an initial position.

6. A grinding device for a coffee machine according to any one of claims 1 to 5, characterized in that: the regulating disk (36) is rotationally restrained on the peripheral wall of the grinding chamber (10) and is restrained from moving in the up-down direction relative to the grinding chamber (10);

an adjusting cylinder (37) is further arranged on the inner side of the adjusting disc (36), the outer wall of the adjusting cylinder (37) is in threaded connection with the inner wall of the adjusting disc (36), and the adjusting cylinder (37) is restrained on the grinding chamber (10) in an up-down movable mode and is restrained from rotating relative to the grinding chamber (10) in the circumferential direction;

the outer grinding core (22) is connected with the adjusting cylinder (37) and can move up and down along with the adjusting cylinder (37);

the adjusting cylinder (37) forms the transmission element.

7. The grinding device for a coffee machine according to claim 6, wherein: the grinding chamber (10) is provided with a limiting slot (11) which extends vertically, and the adjusting cylinder (37) is provided with an inserting arm (371) which extends vertically and is inserted into the limiting slot.

8. The grinding device for a coffee machine according to claim 6, wherein: the grinding machine also comprises a mounting sleeve (23) for the outer grinding core (22) to be installed therein, and the mounting sleeve (23) is connected to the inner wall of the adjusting cylinder (37) in a rotary clamping manner.

9. A grinding device for a coffee machine according to any one of claims 1 to 5, characterized in that: the periphery of the adjusting disc (36) is provided with a circle of transmission teeth (362), and the output shaft of the first driving motor (31) is in transmission connection with the transmission teeth (362) of the adjusting disc (36) through a gear transmission assembly.

10. A coffee machine comprising a grinding device, characterized in that: the pulverizing apparatus according to any one of claims 1 to 9.