Bean grinder

Abstract

The application provides a bean grinding device, which comprises a machine body, a motor and a bean grinding bin are arranged in the machine body, a feeding port and a powder outlet are arranged on the machine body and communicate with the bean grinding bin, a fixed cutter disc and a movable cutter disc assembly detachably connected with a rotating shaft are arranged in the bean grinding bin, the rotating shaft is driven to rotate by the motor, and the fixed cutter disc is arranged opposite to the movable cutter disc assembly; wherein, at the position opposite to the axis of the movable cutter disc assembly and the rotating shaft, a taper pin is arranged on one of them and a taper hole is arranged on the other one, and the taper pin is inserted into the taper hole to position the movable cutter disc assembly and the rotating shaft. The bean grinding device provided by the application can reduce or even eliminate the gap between the movable cutter disc assembly and the rotating shaft, so as to guarantee the grinding quality of powder.

Description

Technical Field

[0001] This application belongs to the field of small household appliance technology, and more specifically, relates to a coffee grinding device. Background Technology

[0002] The particle size of coffee bean powder directly affects the flavor profile of coffee. A coffee grinder includes a moving burr and a fixed burr. The moving burr is connected to the shaft of the grinding motor, which drives the moving burr to rotate relative to the fixed burr to grind the coffee beans. During grinding, due to the grooves and other gaps in the burr that can trap powder, the burr needs to be disassembled periodically to clean any residual powder.

[0003] In related technologies, the connection structure between the moving cutter head and the rotating shaft is generally a cylinder and a circular hole, which is locked by fasteners (such as bolts). The aforementioned connection structure typically has an assembly gap between the cylinder and the circular hole to facilitate assembly to the greatest extent possible. However, while this assembly gap facilitates assembly, it can also affect the assembly accuracy (e.g., affecting the coaxiality of the two parts, affecting the flatness between the moving and fixed cutter heads), ultimately impacting the powder grinding quality. Summary of the Invention

[0004] The purpose of this application is to provide a grinding device to solve the technical problem in the prior art where the large gap between the moving blade and the rotating shaft affects the quality of powder grinding.

[0005] To achieve the above objectives, the technical solution adopted in this application is to provide a coffee grinding device, which includes: The machine body contains a motor and a grinding chamber. The machine body also has a feed inlet and a powder outlet that communicate with the grinding chamber. The grinding chamber contains a fixed blade and a movable blade assembly that is detachably connected to a rotating shaft. The rotating shaft is driven to rotate by a motor. The fixed blade and the movable blade assembly are positioned opposite each other.

[0006] Specifically, at the directly opposite positions on the axes of the moving cutter head assembly and the rotating shaft, a tapered pin is provided on one of them, and a tapered hole is provided on the other. The tapered pin is inserted into the tapered hole to position the moving cutter head assembly and the rotating shaft.

[0007] Optionally, the machine body is further provided with a feeding channel, the feeding channel and the grinding chamber are arranged sequentially in the same axial direction, the inlet is connected to the feeding channel, and the powder outlet is connected to the grinding chamber.

[0008] Optionally, the moving cutter head assembly includes a cutter holder and a moving cutter head detachably mounted on the cutter holder, the cutter holder being used to connect the rotating shaft.

[0009] Optionally, a clamping jaw is provided on the tool holder, the clamping jaw is used to clamp the peripheral wall of the moving tool disc, and a bolt is provided on the clamping jaw for abutting against the peripheral wall of the moving tool disc.

[0010] Optionally, a permanent magnet is provided on the end face of the tool holder, and an insertion position for inserting the permanent magnet is provided on the side of the moving tool disc facing the tool holder.

[0011] Optionally, the tool holder has a through positioning hole along its axis, and the side of the positioning hole facing the rotating shaft is a tapered hole; the end of the rotating shaft facing the tool holder is formed into a tapered shape, and the rotating shaft facing the tapered hole has a threaded hole.

[0012] Optionally, the machine body has an opening on one side, and an end cap is detachably provided on the end face of the opening. The end cap and the opening together form the grinding chamber. The end face of the end cap is provided with a locking block, and the end face of the opening is provided with a locking groove. The locking block is locked in the locking groove to connect the end cap and the machine body.

[0013] Optionally, a magnetic induction module is provided in the body near the opening, and a permanent magnet is embedded in the end face of the end cover. When the card block is engaged and locked in the card slot, the permanent magnet and the magnetic induction module are directly opposite each other.

[0014] Optionally, a leveling structure is connected between the fixed cutter disc and the machine body, and the leveling structure is used to adjust the flatness between the grinding planes on the fixed cutter disc and the moving cutter disc assembly.

[0015] Optionally, the leveling structure includes a plurality of leveling screw assemblies arranged around the rotating shaft array in the machine body; the leveling screw assembly includes a screw rotatably disposed on the machine body and a screw sleeve slidably disposed on the machine body, the screw and the screw sleeve being threadedly connected, and the screw sleeve being connected to the fixed cutter disc.

[0016] The coffee grinding device provided in this application has at least the following beneficial effects: During the process of connecting and fixing the moving cutter head assembly to the rotating shaft, when the moving cutter head assembly is inserted axially onto the rotating shaft, the conical surface of the tapered pin and the tapered hole are in contact and pressed together axially, so that the tapered pin and the tapered hole can automatically align their centers, thereby reducing or even eliminating the gap between the moving cutter head assembly and the rotating shaft. This ensures that when the moving cutter head assembly is fixedly connected to the rotating shaft, the flatness between the moving cutter head assembly and the fixed cutter head meets the design requirements, thus guaranteeing the grinding quality of the powder. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective cross-sectional view of the bean grinding device in some embodiments of this application.

[0019] Figures 2 to 4 These are exploded views of the grinding device body from different perspectives in some embodiments of this application. Detailed Implementation

[0020] To make the technical problems, technical solutions and beneficial effects to be solved by this application clearer, the following describes this application in further detail with reference to the accompanying drawings and embodiments.

[0021] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0022] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or indirectly on that other component.

[0023] When a component is said to be "connected to" another component, it can be directly connected to the other component or indirectly connected to that other component.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0026] In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically defined.

[0027] Please refer to the following: Figures 1 to 4The grinding device provided in the embodiments of this application will now be described.

[0028] Understandably, reference Figure 1 The bean grinding device provided in this application includes a body 10, a motor 20 and a grinding chamber a are provided inside the body 10, and a feed inlet b and a powder outlet c communicating with the grinding chamber a are also provided on the body 10. A fixed blade 30 and a movable blade assembly 40 detachably connected to a rotating shaft 21 are provided in the grinding chamber a. The fixed blade 30 and the movable blade assembly 40 are arranged opposite to each other, and a grinding gap for grinding powder to be discharged is formed between the fixed blade 30 and the movable blade assembly 40. The rotating shaft 21 is driven to rotate by the motor 20 to drive the movable blade assembly 40 to rotate relative to the fixed blade 30.

[0029] Specifically, refer to Figure 1 The machine body 10 also has a feeding channel d inside, which is arranged sequentially with the grinding chamber a on the same axis. The feed inlet b is connected to the feeding channel d, and the powder outlet c is connected to the grinding chamber a. The feeding channel can buffer the coffee beans before they enter the grinding chamber a, so as to avoid grinding jams caused by the coffee beans being fed too quickly. Furthermore, the rotating shaft 21 is arranged to pass through the feeding channel along the axial direction of the feeding channel. A feeding screw 61 is sleeved in the feeding channel and located around the rotating shaft 21. When the rotating shaft 21 rotates, the feeding screw 61 can orderly convey the coffee beans into the grinding chamber a.

[0030] Specifically, when grinding coffee beans, the coffee beans enter the grinding chamber a through the feed inlet b, and are thrown into the grinding space between the moving blade assembly 40 and the fixed blade 30 by centrifugal force under the high-speed rotation of the moving blade assembly 40. In the grinding space, the coffee beans are ground into powder by the fixed blade 30 and the moving blade assembly 40. Finally, under the action of centrifugal force, the powder is thrown out through the grinding gap between the fixed blade 30 and the moving blade assembly 40 to the powder outlet c.

[0031] Specifically, refer to Figures 1 to 4 At directly opposite positions on the axes of the moving cutter head assembly 40 and the rotating shaft 21, a tapered pin 211 is provided on one of them, and a tapered hole 41 is provided on the other. The tapered pin 211 is inserted into the tapered hole 41 to position the moving cutter head assembly 40 and the rotating shaft 21. In some specific embodiments, the tapered hole 41 is formed on the moving cutter head assembly 40, and the tapered pin 211 is formed at the end of the rotating shaft 21.

[0032] By providing a tapered hole 41 on the movable cutter head assembly 40 and forming a tapered pin 211 at the end of the rotating shaft 21, during the process of assembling the movable cutter head assembly 40 onto the rotating shaft 21, when the movable cutter head assembly 40 is inserted axially onto the rotating shaft 21, the conical surface of the tapered pin 211 on the rotating shaft 21 fits against the side wall of the tapered hole 41 on the movable cutter head assembly 40, and the tapered pin 211 and the tapered hole 41 can press against each other axially, so that the movable cutter head assembly 40 can automatically align with the center during the process of being inserted into the rotating shaft 21. Thus, during the research and development stage, a pre-existing assembly gap can be avoided between the moving cutter head assembly 40 and the rotating shaft 21. This avoids the impact of the assembly gap on the parallelism between the end faces of the moving cutter head assembly 40 and the fixed cutter head 30 (which in turn affects the size of the grinding gap between the grinding surfaces of the moving cutter head assembly 40 and the fixed cutter head 30). As a result, when the rotating shaft 21 is inserted and fixed, the width of the grinding gap formed at different circumferential positions between the moving cutter head assembly 40 and the fixed cutter head 30 can be consistent with the design requirements. This ensures that the width of the grinding gap is consistent at all points, thereby guaranteeing that the powder particle size is basically uniform and ensuring the grinding quality of the powder. It also avoids or reduces the number of times the moving cutter head assembly 40 and the fixed cutter head 30 need to be leveled.

[0033] refer to Figure 3 and Figure 4 In some embodiments, the movable cutter head assembly 40 includes a cutter holder 42 and a movable cutter head 43 detachably mounted on the cutter holder 42. The cutter holder 42 is used to connect the rotating shaft 21. Specifically, a clamping jaw 421 is provided on the cutter holder 42 for clamping the peripheral wall of the movable cutter head 43, and a bolt 423 is provided on the clamping jaw 421 for abutting against the peripheral wall of the movable cutter head 43. In this way, the movable cutter head 43 is circumferentially fixed to the cutter holder 42, which avoids the need to drill a threaded hole 212 on one side of the grinding surface of the movable cutter head 43 to lock the bolt 423, thereby reducing the formation of powder accumulation space on one side of the grinding surface and facilitating the cleaning and maintenance of the movable cutter head 43.

[0034] refer to Figure 3 and Figure 4 Furthermore, a permanent magnet 422 is provided on the end face of the tool holder 42, and an insertion position 431 for inserting the permanent magnet is provided on the side of the moving tool disc 43 facing the tool holder 42 (i.e., the back of the moving tool disc 43). It should be understood that the moving tool disc 43 is made of a magnetically conductive material, such as carbon steel. Thus, when the moving tool disc 43 and the tool holder 42 are assembled together, the insertion position 431 can be aligned with the permanent magnet 422 to position the moving tool disc 43, facilitating the subsequent installation of the locking bolts on the peripheral wall of the moving tool disc 43 in case of displacement.

[0035] refer to Figure 3Furthermore, the tool holder 42 has a through positioning hole 44 along its axis, and the side of the positioning hole 44 facing the rotating shaft 21 is a tapered hole 41; the end of the rotating shaft 21 facing the tool holder 42 is formed into a tapered pin 211, and the rotating shaft 21 has a threaded hole 212 facing the tapered hole 41. When assembling the moving tool disc 43 and the tool holder 42, the bolt is inserted from the side of the positioning hole 44 away from the tapered hole 41, passes through the positioning hole 44 and is threaded into the threaded hole 212. During the process of tightening the bolt into the threaded hole 212, the bolt applies an axial force to the tool holder 42 towards the rotating shaft 21, thereby pressing the tapered hole 41 on the tool holder 42 and the tapered surface on the rotating shaft 21 together.

[0036] refer to Figures 2 to 4 In some embodiments, the machine body 10 has an opening on one side, and an end cap 50 is detachably provided on the end face of the opening. The end cap 50 and the opening together form the grinding chamber a. Specifically, the end face of the end cap 50 is provided with a locking block 51, and the end face of the opening is provided with a locking groove 11. The locking groove 11 extends along the circumferential direction of the opening. After the locking block 51 is engaged in the locking groove 11, it rotates in the circumferential direction to connect the end cap 50 and the machine body 10.

[0037] Further reference Figure 4 A magnetic induction module 12 is installed near the opening in the body 10. A permanent magnet 52 is embedded in the end face of the end cap 50. After the locking block 51 is engaged and locked in the slot 11, the permanent magnet 52 and the magnetic induction module 12 are directly opposite each other. It is understood that the grinding device includes a main control board used to control the start / stop and speed of the motor 20. The aforementioned magnetic induction module 12 is electrically connected to the main control board. When the magnetic induction module 12 detects the permanent magnet, it indicates that the end cap 50 is properly assembled and fixed. At this time, the magnetic induction module 12 sends a signal (referred to as the first signal) to the main control board. Before starting the motor 20, the main control board first checks whether the magnetic induction module 12 has sent the first signal. By setting up the magnetic induction module 12 and the permanent magnet 52, a self-check operation is required before each start of the motor 20 for grinding operations to avoid potential damage caused by starting the motor 20 when the end cap 50 is not properly assembled.

[0038] refer to Figure 1 In some embodiments, a leveling structure is connected between the fixed cutter head 30 and the machine body 10. The leveling structure is used to adjust the flatness between the end faces of the fixed cutter head 30 and the moving cutter head assembly 40. That is, the leveling assembly can drive the fixed cutter head 30 to deflect relative to the moving cutter head assembly 40 to compensate for the tolerances generated during the manufacturing and assembly process.

[0039] Specifically, the leveling structure includes a plurality of leveling screw 61 assemblies arranged in an array around the rotating shaft 21 in the machine body 10; the leveling screw 61 assembly includes a screw 61 rotatably disposed on the machine body 10 and a screw sleeve 62 slidably disposed on the machine body 10, the screw 61 and the screw sleeve 62 are threadedly connected, and the screw sleeve 62 is connected (either directly or indirectly) to the fixed cutter head 30. When leveling is required, one or more screws 61 are rotated to drive the screw sleeve 62 to move linearly in a direction parallel to the axis of rotation 21. Since the screw sleeve 62 is fixedly connected to the fixed cutter disc 30, when one screw sleeve 62 remains in a constant position, and the other one or more screw sleeves 62 move at different distances in a direction parallel to the axis of rotation 21, the fixed cutter disc 30 will deflect relative to the moving cutter disc assembly 40, thereby making the end faces of the two tend to be parallel. This ensures that the width of the grinding gap formed at different circumferential positions between the moving cutter disc assembly 40 and the fixed cutter disc 30 is equal, so as to achieve that the powder particle size is basically equal and thus ensure the grinding quality of the powder.

[0040] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A coffee grinding device, characterized in that, include: The machine body contains a motor and a grinding chamber. The machine body also has a feed inlet and a powder outlet communicating with the grinding chamber. The grinding chamber contains a fixed blade and a movable blade assembly detachably connected to a rotating shaft. The rotating shaft is driven to rotate by a motor. The fixed blade and the movable blade assembly are arranged opposite each other. Specifically, at the directly opposite positions on the axes of the moving cutter head assembly and the rotating shaft, a tapered pin is provided on one of them, and a tapered hole is provided on the other. The tapered pin is inserted into the tapered hole to position the moving cutter head assembly and the rotating shaft.

2. The grinding device as described in claim 1, characterized in that: The machine body is also provided with a feeding channel. The feeding channel and the grinding chamber are arranged sequentially on the same axis. The feed inlet is connected to the feeding channel, and the powder outlet is connected to the grinding chamber.

3. The coffee grinding device as described in claim 1, characterized in that: The moving cutter head assembly includes a cutter holder and a moving cutter head detachably mounted on the cutter holder, the cutter holder being used to connect the rotating shaft.

4. The grinding device as described in claim 3, characterized in that: The tool holder is provided with a cleaver for gripping the peripheral wall of the moving tool disc, and the cleaver is provided with a bolt for abutting against the peripheral wall of the moving tool disc.

5. The grinding device as described in claim 3 or 4, characterized in that: A permanent magnet is provided on the end face of the tool holder, and an insertion position for inserting the permanent magnet is provided on the side of the moving tool disc facing the tool holder.

6. The bean grinding device as described in claim 3 or 4, characterized in that: The tool holder has a through positioning hole along its axis, and the side of the positioning hole facing the rotating shaft is a tapered hole; the end of the rotating shaft facing the tool holder is formed into a tapered shape, and a threaded hole is provided on the rotating shaft facing the tapered hole.

7. The coffee grinding apparatus according to any one of claims 1 to 4, characterized in that: The machine body has an opening on one side, and an end cap is detachably provided on the end face of the opening. The end cap and the opening together form the grinding chamber. The end face of the end cap is provided with a locking block, and the end face of the opening is provided with a locking groove. The locking block is locked in the locking groove to connect the end cap and the machine body.

8. The grinding device as described in claim 7, characterized in that: A magnetic induction module is provided in the body near the opening, and a permanent magnet is embedded in the end face of the end cover. When the card block is engaged and locked in the card slot, the permanent magnet and the magnetic induction module are directly opposite each other.

9. The coffee grinding apparatus according to any one of claims 1 to 4, characterized in that: A leveling structure is connected between the fixed cutter head and the machine body. The leveling structure is used to adjust the flatness between the grinding planes on the fixed cutter head and the moving cutter head assembly.

10. The grinding device as described in claim 9, characterized in that: The leveling structure includes a plurality of leveling screw assemblies arranged around the rotating shaft array in the machine body; the leveling screw assembly includes a screw rotatably disposed on the machine body and a screw sleeve slidably disposed on the machine body, the screw and the screw sleeve being threadedly connected, and the screw sleeve being connected to the fixed cutter disc.

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