Grinding device and coffee machine

Abstract

The utility model provides a grinding device and a coffee machine. The grinding device comprises a power mechanism; a first mounting bracket; the rotating shaft is connected with the power mechanism, a boss is arranged on the peripheral side of the rotating shaft, and a fastener capable of moving in the axial direction of the rotating shaft is arranged at the first end of the rotating shaft; the grinding knife assembly comprises a grinding knife arranged on the rotating shaft in a sleeving mode, the fastener acts on the first end of the grinding knife, and the second end of the grinding knife abuts against the first side of the boss of the rotating shaft; the rotating shaft is sleeved with the first bearing, an inner ring of the first bearing is fixed to the rotating shaft, the first end of the inner ring of the first bearing abuts against the second side, deviating from the first side, of the boss, the outer ring of the first bearing is fixed to the first mounting support, and the first bearing is positioned by the first mounting support in the radial direction; and the axial direction of the first bearing is positioned by the first mounting bracket or the pushing assembly. According to the grinding device, the problem that the grinding knives and the rotating shaft axially move can be solved, the content of ground coffee powder in the diameter range of all particles is stable, and the taste of coffee is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of small household appliances, and particularly relates to a grinding device and a coffee machine with the grinding device. BACKGROUND

[0002] The grinding device used by the existing coffee machine generally only uses a shaft sleeve to fix a rotating shaft, but the rotating shaft is prone to axial movement due to the lack of fixation, and axial movement also occurs between a conical grinding knife on the rotating shaft and the rotating shaft, so that the content of the ground coffee powder in the range of each particle diameter is unstable, which affects the taste of the coffee. Therefore, avoiding axial movement of the rotating shaft and the conical grinding knife is a problem to be solved at present. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problems existing in the prior art, the purpose of the embodiments of the application is to provide a grinding device capable of avoiding axial movement of a rotating shaft and a grinding knife and improving the content stability of ground powder in the range of each particle diameter.

[0004] The technical scheme adopted by the embodiments of the application is a grinding device, which comprises a power mechanism and further comprises:

[0005] a first mounting bracket;

[0006] a rotating shaft connected with the power mechanism and rotating under the driving of the power mechanism, a convex boss being arranged on the circumferential side of the rotating shaft, and a fastener capable of moving along the axial direction of the rotating shaft being arranged at the first end of the rotating shaft;

[0007] a grinding knife assembly comprising a grinding knife sleeved on the rotating shaft and capable of synchronously rotating with the rotating shaft, the fastener acting on the first end of the grinding knife and making the second end of the grinding knife abut against the first side of the convex boss of the rotating shaft;

[0008] a first bearing sleeved on the rotating shaft, the inner ring of the first bearing being fixed with the rotating shaft, the first end of the inner ring of the first bearing abutting against the second side of the convex boss which is opposite to the first side, the outer ring of the first bearing being fixed with the first mounting bracket to position the radial direction and the axial direction of the first bearing respectively or only the radial direction of the first bearing, and the axial direction of the first bearing being positioned by a pushing assembly arranged on the first mounting bracket and exerting an acting force on the first end of the inner ring of the first bearing to make the first end abut against the second side of the convex boss.

[0009] The embodiment of the application realizes the fixation of the grinding tool and the rotating shaft and the axial positioning of the rotating shaft by the cooperation of the fastener and the first side of the boss on the rotating shaft and the cooperation of the inner ring of the first bearing and the second side of the boss, avoids the axial movement of the grinding tool and the rotating shaft, and makes the content of the ground coffee powder in each particle diameter range stable. Moreover, the radial positioning of the rotating shaft is realized by the fixation of the outer ring of the first bearing and the first mounting bracket, the radial deviation of the rotating shaft is avoided, and the rotation stability of the rotating shaft is ensured.

[0010] In an optional embodiment, the thrust assembly comprises a second bearing and a positioning sleeve, which are sleeved on the rotating shaft respectively, the inner ring of the second bearing is fixed with the rotating shaft, and the outer ring of the second bearing is fixed with the first mounting bracket, so that the first mounting bracket positions the second bearing in the radial and axial directions; the positioning sleeve is located between the first bearing and the second bearing, and the two ends of the positioning sleeve in the axial direction abut against the inner ring of the first bearing and the inner ring of the second bearing respectively. Through the second bearing and the positioning sleeve, the axial positioning of the first bearing can be ensured, so that the first bearing keeps abutting against the second side of the rotating shaft.

[0011] In an optional embodiment, the first mounting bracket comprises an assembly hole, the assembly hole comprises a first hole section and a second hole section which are connected and communicated, the hole diameter of the first hole section is greater than the hole diameter of the second hole section, so that a first stepped surface is formed between the first hole section and the second hole section, the first bearing is arranged in the first hole section, and the outer wall of the outer ring of the first bearing is in interference fit with the hole wall of the first hole section. By designing the assembly hole in the form of variable diameter, the installation of the first bearing on the first mounting bracket is facilitated.

[0012] In an optional embodiment, the assembly hole further comprises a third hole section which is connected and communicated with the second hole section, the hole diameter of the third hole section is greater than the hole diameter of the second hole section, so that a second stepped surface is formed between the second hole section and the third hole section; the positioning sleeve is arranged in the second hole section, the second bearing is arranged in the third hole section, the first end of the outer ring of the second bearing abuts against the second stepped surface, and the outer wall of the outer ring of the second bearing is in interference fit with the hole wall of the third hole section. By arranging the third hole section, the installation of the second bearing and the fixation of the second bearing with the first mounting bracket are facilitated.

[0013] In an optional embodiment, a pressing plate is fixed on the first mounting bracket, and the pressing plate is pressed against the second end of the outer ring of the second bearing to lock the outer ring of the second bearing on the first mounting bracket.

[0014] Optionally, the grinding device further comprises an adjusting assembly, the adjusting assembly comprises a cutter head and a cutter head seat, the cutter head is arranged on the cutter head seat and sleeved on the grinding knife, a grinding gap is formed between the cutter head and the grinding knife, the cutter head seat is provided with an annular mounting surface on the side connected with the bean box, and a silica gel gasket is arranged on the mounting surface. The silica gel gasket can play a role of shock absorption, and realize soft connection of the cutter head and the bottom of the bean box.

[0015] Optionally, the fastener comprises a first nut, the first end of the rotating shaft is provided with an external thread, the first nut is threadedly connected to the first end of the rotating shaft, and the first nut can press the grinding knife on the boss of the rotating shaft when the first nut is rotated towards the grinding knife. The structure is simple, the adjustment is convenient, and the fastening effect is good.

[0016] Optionally, the grinding device further comprises a second mounting bracket, the second mounting bracket is connected with the first mounting bracket and surrounds a mounting cavity in communication with the assembly hole, the second mounting bracket is provided with a limiting hole, the second end of the rotating shaft penetrates through the assembly hole and extends into the mounting cavity and is rotatably arranged in the limiting hole.

[0017] Optionally, the power mechanism comprises a motor, a screw rod, a first gear and a second gear, the motor is arranged on the first mounting bracket, the screw rod is connected with the output shaft of the motor and extends into the mounting cavity, the first gear is engaged with the screw rod, the second gear is fixed to the second end of the rotating shaft and engaged with the first gear, and the first gear and the second gear are both located in the mounting cavity. The power mechanism is rationally designed, the rotating shaft is conveniently driven to rotate, and the grinding operation is realized.

[0018] The application also provides a coffee machine comprising a machine body and the grinding device of any one of the above embodiments.

[0019] Compared with the prior art, the grinding device has the advantages that the grinding knife and the rotating shaft of the grinding device cannot move in the axial direction, the rotating shaft has high transmission stability, the problem of stable grinding particle size is effectively solved, and the grinding device has a wide application prospect in the coffee machine industry.

[0020] It should be understood that the foregoing general description and the following detailed description are only exemplary and illustrative, but not for limiting the application.

[0021] The foregoing general description and the following detailed description of various implementations or examples of the technology described in the application are not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF DRAWINGS

[0022] In the drawings, which are not necessarily drawn to scale, like numerals describe similar components throughout the several views. The drawings illustrate various embodiments by way of example and not by way of limitation. The same reference numbers in different drawings identify the same or similar elements.

[0023] Figure 1 A perspective view of a flour grinding device according to an embodiment of the present application.

[0024] Figure 2 A partial top view of a flour grinding device according to an embodiment of the present application.

[0025] Figure 3 A partial top view of a flour grinding device according to an embodiment of the present application. Figure 2 An expanded view of the section A-A, B-B and C-C.

[0026] Figure 4 An exploded view of an adjusting assembly and a silica gel ring according to an embodiment of the present application.

[0027] Figure 5 An exploded view of a partial structure of a flour grinding device according to an embodiment of the present application.

[0028] Reference signs:

[0029] 1 - first mounting bracket; 11 - second hole section; 12 - first stepped surface;

[0030] 2 - rotating shaft; 21 - boss; 22 - flat position; 23 - first bearing; 24 - second bearing; 25 - first gasket; 26 - second gasket; 27 - friction plate; 28 - third gasket; 29 - positioning sleeve;

[0031] 3 - first nut; 4 - second nut; 5 - grinding knife;

[0032] 6 - pressing plate;

[0033] 7 - adjusting assembly; 71 - adjusting ring; 72 - knife disc; 73 - knife disc seat; 74 - mounting surface; 75 - silica gel ring; 76 - bean box seat;

[0034] 8 - second mounting bracket; 81 - mounting cavity; 82 - limiting hole;

[0035] 9 - power mechanism; 91 - motor; 92 - screw rod; 93 - first gear; 94 - wheel shaft; 95 - second gear. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0037] Unless otherwise defined, technical or scientific terms used in the present application shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "first", "second", and similar terms used in the present application do not denote any order, quantity, or importance, but are used to distinguish different components. The terms "include", "contain", and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are used only to represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships can also be changed accordingly.

[0038] In order to keep the following description of the embodiments of the present application clear and concise, the present application omits the detailed description of known functions and known components.

[0039] The embodiments of the present application provide a grinding device, which can be applied to a coffee machine and used for grinding coffee beans.

[0040] As shown in Figures 1 to 5 The grinding device of the embodiments of the present application includes a power mechanism 9, a first mounting bracket 1, a rotating shaft 2, a grinding blade assembly, and a first bearing 23. The first mounting bracket 1 is a basic mounting member of each component. The power mechanism 9 is fixed to the first mounting bracket 1 and used to transmit power to the rotating shaft 2.

[0041] As shown in Figure 3As shown, the rotating shaft 2 is connected with the power mechanism 9 and rotates around its own axis under the driving of the power mechanism 9. The rotating shaft 2 is provided with a boss 21 on the circumferential side, and the first end of the rotating shaft 2 is provided with a fastener capable of moving along the axial direction of the rotating shaft 2. The grinding assembly comprises a grinding blade 5 sleeved on the rotating shaft 2 and capable of rotating synchronously with the rotating shaft 2, and the fastener acts on the first end of the grinding blade 5. When the fastener moves along the axial direction of the rotating shaft 2 towards the grinding blade 5, the second end of the grinding blade 5 is abutted against the first side of the boss 21 of the rotating shaft 2, thereby realizing the axial fixation of the grinding blade 5 and the rotating shaft 2. A first bearing 23 is sleeved on the rotating shaft 2, the inner ring of the first bearing 23 is fixed with the rotating shaft 2 so as to rotate with the rotating shaft 2, the first end of the inner ring of the first bearing 23 is abutted against the second side of the boss 21 which is opposite to the first side, and the outer ring of the first bearing 23 is fixed with the first mounting bracket 1.

[0042] It can be understood that the fixation of the outer ring of the first bearing 23 with the first mounting bracket 1 includes two cases. One case is that the first mounting bracket 1 simultaneously realizes the radial and axial positioning of the outer ring of the first bearing 23, so that the first bearing 23 cannot move radially and axially relative to the first mounting bracket 1, and the inner ring of the first bearing 23 can be kept in the state of abutting against the second side of the boss 21. The other case is that the first mounting bracket 1 only realizes the radial positioning of the outer ring of the first bearing 23, the first bearing 23 cannot move radially relative to the first mounting bracket 1, but the first mounting bracket 1 does not position the axial direction of the first bearing 23, the first bearing 23 can move axially relative to the first mounting bracket 1. In order to keep the inner ring of the first bearing 23 abutting against the second side of the boss 21, the first bearing 23 needs to be pressed against the second side of the boss 21 by a pushing assembly. The pushing assembly is arranged on the first mounting bracket 1 and applies a force to the inner ring of the first bearing 23 so that the first end of the inner ring abuts against the second side of the boss 21. In this way, the radial and axial positioning of the first bearing 23 is realized. That is, the radial direction of the first bearing 23 is positioned by the first mounting bracket 1, and the axial direction of the first bearing 23 is positioned by the first mounting bracket 1 or the pushing assembly. The embodiment of the present application firmly fixes the grinding blade 5 on the rotating shaft 2 by the cooperation of the fastener and the boss 21 on the rotating shaft 2, so that the grinding blade 5 cannot move axially relative to the rotating shaft 2. At the same time, the axial positioning of the rotating shaft 2 is realized by abutting the inner ring of the first bearing 23 against the second side of the boss 21, so that the rotating shaft 2 cannot move axially. Moreover, the outer ring of the first bearing 23 is fixed with the first mounting bracket 1, which realizes the radial positioning of the rotating shaft 2 and avoids the radial deviation of the rotating shaft 2. Therefore, the grinding device of the embodiment of the present application uses the cooperation of the inner ring of the first bearing 23 and the fastener as the axial positioning of the grinding blade 5 and the rotating shaft 2, and uses the outer ring of the first bearing 23 as the radial positioning of the rotating shaft 2. While ensuring the stability of the rotation of the rotating shaft 2, the axial jumping problem of the grinding blade 5 and the rotating shaft 2 is solved, so that the content of the ground coffee powder in the range of particle diameter is stable.

[0043] It can be understood that the specific form of the boss 21 on the rotating shaft 2 is not limited, for example, it can be an annular ridge formed by the partial outer circumference of the rotating shaft 2 protruding outward, or it can be an annular ring fixedly sleeved on the outside of the rotating shaft 2, as long as the boss 21 has two opposite side surfaces for respectively contacting and abutting against the end surface of the first end of the grinding tool 5 and the end surface of the first end of the inner ring of the first bearing 23.

[0044] In some embodiments, as shown in Figure 3 , the thrust assembly includes a second bearing 24 and a positioning sleeve 29 respectively sleeved on the rotating shaft 2, the inner ring of the second bearing 24 is fixed with the rotating shaft 2, the outer ring of the second bearing 24 is fixed with the first mounting bracket 1, and the first mounting bracket 1 positions the second bearing 24 in the radial and axial directions. The positioning sleeve 29 is located between the first bearing 23 and the second bearing 24, and the two ends of the positioning sleeve 29 in the axial direction abut against the inner ring of the first bearing 23 and the inner ring of the second bearing 24, respectively. Through the second bearing 24 and the positioning sleeve 29, the axial positioning of the first bearing 23 can be ensured, so that it remains abutting against the second side of the rotating shaft 2. In addition, the positioning sleeve 29 can limit the distance between the two bearings to position the positions of the two bearings and improve the assembly accuracy. In some embodiments, as shown in Figure 3 , the first mounting bracket 1 includes an assembly hole, which includes a first hole section (not shown because the first bearing 23 is arranged in the first hole section) and a second hole section 11 in communication, the hole diameter of the first hole section is larger than that of the second hole section 11, so that a first step surface 12 is formed between them, the first bearing 23 is arranged in the first hole section, and the outer wall of the outer ring of the first bearing 23 is in interference fit with the hole wall of the first hole section. Through the variable-diameter setting of the above assembly hole, the installation of the first bearing 23 on the first mounting bracket 1 is facilitated, and at the same time the fixation with the first mounting bracket 1 is realized, and then the radial positioning of the rotating shaft 2 is realized.

[0045] Continuing to combine Figure 3 , the second end (lower end in Figure 3 ) of the first bearing 23 has a gap with the first step surface 12, which avoids friction with the first step surface 12 when the inner ring of the first bearing 23 rotates with the rotating shaft 2, and can also reduce the rotation resistance.

[0046] In some embodiments, the mounting hole further includes a third hole section (not shown because a second bearing 24 is housed within it) connected to and communicating with the second hole section 11. The diameter of the third hole section is larger than the diameter of the second hole section 11, so that a second stepped surface is formed between them. A positioning sleeve 29 is disposed within the second hole section 11. The second bearing 24 is disposed within the third hole section. The first end of the outer ring of the second bearing 24 abuts against the second stepped surface, and the outer wall of the outer ring of the second bearing 24 is interference-fitted with the hole wall of the third hole section. By providing the third hole section, the installation of the second bearing 24 and its fixation to the first mounting bracket 1 are facilitated; moreover, the center of the rotating shaft 2 is positioned by the cooperation of the inner ring of the first bearing 23 and the inner ring of the second bearing 24, preventing the rotating shaft 2 from becoming eccentric.

[0047] like Figure 3 As shown, a pressure plate 6 is fixed on the first mounting bracket 1. The pressure plate 6 presses against the second end of the outer ring of the second bearing 24 to lock the outer ring of the second bearing 24 onto the first mounting bracket 1. The pressure plate 6 further locks and fixes the outer ring of the second bearing 24 to the first mounting bracket 1, improving the stability of the structure.

[0048] The grinding device also includes an adjustment component 7, which comprises an adjustment ring 71, a cutter disc 72, and a cutter disc seat 73. The cutter disc 72 is mounted on the cutter disc seat 73 and sleeved over the grinding blade 5, forming a grinding gap between the cutter disc 72 and the grinding blade 5. The adjustment ring 71 is connected to the cutter disc seat 73 and is used to drive the cutter disc seat 73 and the cutter disc 72 on the cutter disc seat 73 to move together in an axial direction parallel to the rotating shaft 2, thereby changing the gap between the cutter disc 72 and the grinding blade 5, and thus adjusting the grinding fineness.

[0049] like Figure 4 As shown, the cutter holder 73 is used with the bean box ( Figure 1 Only the bean box holder 76 is shown in the figure. The bean box holder 76 is used to connect the bean box (the bean box is not shown in the figure). The side of the connection has an annular mounting surface 74, and a silicone gasket 75 is provided on the mounting surface 74. The silicone gasket 75 plays a role in shock absorption, realizing a soft connection between the cutter head 72 and the bottom of the bean box, and avoiding axial transmission of the cutter head 72.

[0050] In some embodiments, such as Figure 3 and Figure 5 As shown, the fastener includes a first nut 3. The first end of the rotating shaft 2 has an external thread, and the first nut 3 is threadedly connected to the first end of the rotating shaft 2. When the first nut 3 rotates toward the grinding tool 5, it can press against the first end of the grinding tool 5 to press the grinding tool 5 onto the boss 21 of the rotating shaft 2. Using the first nut 3 as the fastener is convenient for adjustment and has a good tightening effect. To avoid hard contact and wear between the first nut 3 and the grinding tool 5, a first washer 25 can be set between them. That is, the first washer 25 is sleeved on the rotating shaft 2 and located between the first nut 3 and the grinding tool 5.

[0051] In some embodiments, the above continues to combine Figure 3 and Figure 5 The grinding device further comprises a second mounting bracket 8, which is connected with the first mounting bracket 1 and encloses a mounting cavity 81 in communication with the assembly hole. The second mounting bracket 8 is provided with a limiting hole 82, and the second end of the rotating shaft 2 extends into the mounting cavity 81 through the assembly hole and is rotatably arranged in the limiting hole 82. By arranging the second mounting bracket 8 cooperating with the first mounting bracket 1, the rotating shaft 2 is supported to rotate smoothly and stably.

[0052] In some embodiments, the above continues to combine Figure 3 and Figure 5 The power mechanism 9 comprises a motor 91, a screw rod 92, a first gear 93 and a second gear 95. The motor 91 is arranged on the first mounting bracket 1, and the screw rod 92 is connected with the output shaft of the motor 91 and extends into the mounting cavity 81. The first gear 93 is engaged with the screw rod 92, and the second gear 95 is fixed to the second end of the rotating shaft 2 and engaged with the first gear 93. Both the first gear 93 and the second gear 95 are located in the mounting cavity 81. When the motor 91 is started, the screw rod 92 is driven to rotate, which in turn drives the first gear 93 engaged with the screw rod 92 to rotate, and the first gear 93 further drives the second gear 95 to rotate, thereby driving the rotating shaft 2 and the grinding knife 5 fixed to the rotating shaft 2 to rotate, so as to realize the grinding operation.

[0053] Further, the rotating shaft 2 is provided with a flat position 22 for positioning, and both the grinding knife 5 and the second gear 95 are arranged at the flat position 22, so as to ensure that the grinding knife 5 and the second gear 95 can rotate with the rotating shaft 2.

[0054] The above continues to combine Figure 3 Both ends of the wheel shaft 94 for mounting the first gear 93 are rotatably connected with the first mounting bracket 1 and the second mounting bracket 8, respectively. For example, the wheel shaft 94 can also be arranged by arranging corresponding limiting holes on the two mounting brackets and rotatably arranging both ends of the wheel shaft 94 in the corresponding limiting holes.

[0055] During assembly, for example Figure 3As shown, first, the first bearing 23, the positioning sleeve 29 and the second bearing 24 are sequentially sleeved on the rotating shaft 2, and the second bearing 24 is arranged in the third hole section, the outer ring end face of the second bearing 24 is locked by the pressing plate 6, the second bearing 24 is locked on the first mounting bracket 1, and the second bearing 24 serves as a subsequent installation basis; then the second gasket 26, the friction plate 27, the second gear 95 and the third gasket 28 are sequentially sleeved below the second bearing 24 of the rotating shaft 2, and finally locked by the second nut 4; then the grinding knife 5, the first gasket 26 and the first nut 3 are sequentially sleeved above the boss 21 of the rotating shaft 2, the first nut 3 is rotated towards the boss 21, the grinding knife 5 is locked by the first nut 3, the grinding knife 5 is tightly pressed against the first side of the boss 21, the first end of the inner ring of the first bearing 24 is tightly pressed against the second side of the boss 21, the axial fixing of the grinding knife 5 and the rotating shaft 2 is realized, and axial jumping is avoided.

[0056] The embodiment of the present application also provides a coffee machine, which comprises a machine body and the grinding device in any of the above embodiments, and the grinding device is arranged on the machine body and used for grinding coffee beans.

[0057] The coffee machine provided by the embodiment of the present application has the grinding device, and thus has the advantages that the content of the ground coffee powder in each particle diameter range is stable, and the taste of coffee is ensured.

[0058] The above description is intended to be illustrative rather than restrictive, and the ordinary skill in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present disclosure. Moreover, the above examples (or one or more solutions thereof) can be used in combination with each other, and the embodiments can be combined with each other in various combinations or arrangements.

Claims

1. A grinding apparatus, comprising a power mechanism (9), characterized in that, Also includes: First mounting bracket (1); A rotating shaft (2) is connected to the power mechanism (9) and rotates under the drive of the power mechanism (9). The rotating shaft (2) has a boss (21) on its periphery and a fastener that can move along its axial direction at the first end of the rotating shaft (2). The sharpening assembly includes a sharpening blade (5) sleeved on the rotating shaft (2) and capable of rotating synchronously with the rotating shaft (2), the fastener acting on the first end of the sharpening blade (5) and causing the second end of the sharpening blade (5) to abut against the first side of the boss (21) of the rotating shaft (2); A first bearing (23) is sleeved on the rotating shaft (2). The inner ring of the first bearing (23) is fixed to the rotating shaft (2), and the first end of the inner ring of the first bearing (23) abuts against the second side of the boss (21) opposite to its first side. The outer ring of the first bearing (23) is fixed to the first mounting bracket (1) to position the first bearing (23) radially and axially, or to position the first bearing (23) radially only. The axial position of the first bearing (23) is positioned by a push assembly, which is provided on the first mounting bracket (1) and applies a force to the first bearing (23) so that the first end of its inner ring abuts against the second side of the boss (21).

2. The grinding apparatus according to claim 1, characterized in that, The jacking assembly includes a second bearing (24) and a positioning sleeve (29) respectively sleeved on the rotating shaft (2). The inner ring of the second bearing (24) is fixed to the rotating shaft (2), and the outer ring of the second bearing (24) is fixed to the first mounting bracket (1) so that the first mounting bracket (1) positions the second bearing (24) radially and axially. The positioning sleeve (29) is located between the first bearing (23) and the second bearing (24), and the two ends of the positioning sleeve (29) in the axial direction abut against the inner ring of the first bearing (23) and the inner ring of the second bearing (24) respectively.

3. The grinding apparatus according to claim 2, characterized in that, The first mounting bracket (1) includes an assembly hole, which includes a first hole segment and a second hole segment (11) that are connected. The diameter of the first hole segment is larger than the diameter of the second hole segment (11) so that a first stepped surface (12) is formed between the two. The first bearing (23) is disposed in the first hole segment, and the outer wall of the outer ring of the first bearing (23) is interference-fitted with the hole wall of the first hole segment.

4. The grinding apparatus according to claim 3, characterized in that, The assembly hole also includes a third hole section connected and communicating with the second hole section (11). The diameter of the third hole section is larger than that of the second hole section (11) so that a second stepped surface is formed between them. The positioning sleeve (29) is disposed in the second hole section (11), and the second bearing (24) is disposed in the third hole section. The first end of the outer ring of the second bearing (24) abuts against the second stepped surface, and the outer wall of the outer ring of the second bearing (24) is interference-fitted with the hole wall of the third hole section.

5. The grinding apparatus according to claim 2, characterized in that, A pressure plate (6) is fixed on the first mounting bracket (1). The pressure plate (6) presses against the second end of the outer ring of the second bearing (24) to lock the outer ring of the second bearing (24) onto the first mounting bracket (1).

6. The grinding apparatus according to claim 1, characterized in that, The grinding device also includes an adjustment component (7), which includes a blade disc (72) and a blade disc seat (73). The blade disc (72) is disposed on the blade disc seat (73) and sleeved on the grinding blade (5). A grinding gap is formed between the blade disc (72) and the grinding blade (5). The side of the blade disc seat (73) used for connecting with the bean box is provided with an annular mounting surface (74), and a silicone gasket (75) is provided on the mounting surface (74).

7. The grinding apparatus according to claim 1, characterized in that, The fastener includes a first nut (3), and the first end of the rotating shaft (2) is provided with an external thread. The first nut (3) is threadedly connected to the first end of the rotating shaft (2). When the first nut (3) rotates toward the grinding knife (5), it can press the grinding knife (5) onto the boss (21) of the rotating shaft (2).

8. The grinding apparatus according to claim 3, characterized in that, The grinding device further includes a second mounting bracket (8), which is connected to the first mounting bracket (1) and forms a mounting cavity (81) communicating with the assembly hole. The second mounting bracket (8) is provided with a limiting hole (82). The second end of the rotating shaft (2) passes through the assembly hole and extends into the mounting cavity (81), and is rotatably disposed in the limiting hole (82).

9. The grinding apparatus according to claim 8, characterized in that, The power mechanism (9) includes a motor (91), a screw (92), a first gear (93), and a second gear (95). The motor (91) is mounted on the first mounting bracket (1). The screw (92) is connected to the output shaft of the motor (91) and extends into the mounting cavity (81). The first gear (93) meshes with the screw (92). The second gear (95) is fixed to the second end of the rotating shaft (2) and meshes with the first gear (93). Both the first gear (93) and the second gear (95) are located in the mounting cavity (81).

10. A coffee machine, comprising a body, characterized in that, It also includes the grinding apparatus according to any one of claims 1 to 9.

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