CN212066495U - Bean grinding device of coffee machine - Google Patents

Abstract

The utility model relates to the technical field of grinding and brewing beverage preparation devices, in particular to a bean grinding device of a coffee machine; the bean grinder comprises a bean box, a bean grinder and an extraction funnel, wherein the bean box, the bean grinder and the extraction funnel are sequentially connected in a matching manner, and a grinding assembly and a main shaft which can respectively rotate are arranged in the bean grinder; a powder pressing drill is arranged in the lower port of the bean grinder and is in fit connection with the lower end of the main shaft, so that the powder pressing drill can rotate circumferentially along with the main shaft and can move up and down along the main shaft; the powder pressing drill is provided with a clutch transmission device capable of driving the grinding assembly; the utility model discloses a coffee machine grinds beans device adopts a motor drive to grind beans ware, grinds between subassembly and the powder pressing drill through separation and reunion connection, when the grinding volume of coffee beans satisfies the setting value, because of the increase of cake thickness, the powder pressing drill is lifted and breaks off the connection with grinding the subassembly; the powder pressing drill continues to finish powder distribution and compaction operations, the whole structure is simple and compact, and the whole cost of the coffee machine can be effectively reduced.

Description

Bean grinding device of coffee machine

Technical Field

The utility model relates to a grinding and brewing beverage preparation device technical field, in particular to a bean grinding device of a coffee machine.

Background

Coffee extraction is based on two principles, namely diffusion and erosion, and extraction refers to extracting valuable substances from raw materials, and extracting flavor from coffee powder by using water. The flavor differences of coffee therefore depend more on the differences in the extraction and conditioning process than on the nature of the coffee beans. The coffee powder product has the problem of flavor loss, and the higher the quality of single-product coffee beans, the fragrance is mostly lost in three days after grinding, so people all look at the ground coffee. The preparation process of the existing coffee machine comprises a grinding link of coffee beans, the coffee beans are firstly ground into coffee powder by a grinder, and the coffee powder taken by an extraction funnel needs to be smoothed and compacted so as to ensure the extraction effect under a pressure environment. The common coffee machine needs manual operation in the powder distribution and compaction links, which has higher requirement on the operation method of a user and is difficult to ensure the flavor consistency of the finished coffee product.

Therefore, a relatively high-end coffee machine on the market has automatic powder distribution and compaction functions, for example, a bean grinding coffee machine manufactured by Breville corporation-U.S. patent No. 10105002B2 includes a first motor, a second motor, an auger, a bean grinder and a microprocessor, wherein the first motor drives the auger, the second motor drives the bean grinder, current values of the first motor and the second motor are detected by a current sensor and are sent to a microprocessor, and the microprocessor obtains a load signal of the current and then evaluates the load signal. And the control strategy of the microprocessor is based on the current value and the estimated value of the first motor, the comparison result is used for controlling the second motor to be switched on and switched off, and specifically, when the current value exceeds the set range of the estimated value, the second motor stops working.

The existing coffee machine with the automatic powder distribution function has the defects that two motors are used for respectively controlling the spiral drill and the bean grinder, so that the cost is high; the comparison between the current value of the first motor and the estimated value is used as a signal for controlling the second motor, and actually, the detection of the current value has a large delay, so that the bean grinder cannot stop working as expected, and the bean grinding amount is excessive; there may be instability of the program using electronic control; for the specific structure, the design requirements of the components such as the double motors, the bean grinder, the powder pressing wheel and the like are very complex, so that various product form limitations and product control problems are caused.

Accordingly, the prior art is yet to be improved and developed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to prior art's defect and not enough, provide a compact structure, can satisfy grinding, cloth powder, the design of pressing powder integration, effectively improve the work efficiency of coffee machine, with low costs wide coffee machine bean grinding device of range of application.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model relates to a coffee grinder bean grinding device, which comprises a bean box, a bean grinder and an extraction funnel, wherein the bean box, the bean grinder and the extraction funnel are sequentially matched and connected, and a grinding component and a main shaft which can respectively rotate are arranged in the bean grinder; a powder pressing drill is arranged in the lower port of the bean grinder and is in fit connection with the lower end of the main shaft, so that the powder pressing drill can rotate circumferentially along with the main shaft and can move up and down along the main shaft; the powder pressing drill is provided with a clutch transmission device capable of driving the grinding assembly; the main shaft directly drives the powder pressing drill, and the powder pressing drill is linked with the grinding assembly through the clutch transmission device; coffee beans in the bean box enter the bean grinder and are ground into coffee powder by the grinding assembly, the coffee powder falls into the extraction funnel from the lower port of the bean grinder, and the powder pressing drill is used for performing powder distribution and compaction treatment on the coffee powder accumulated in the extraction funnel.

The increase of the component in the extraction funnel leads to the increase of the thickness of the powder cake, the upward movement of the powder pressing drill along the main shaft is pushed, and the upward stroke of the powder pressing drill can disconnect the clutch transmission device so as to stop the grinding assembly; at the moment, the bean grinder does not grind any more, but the powder pressing drill can continuously push the residual coffee powder in the bean grinder into the extraction funnel and continuously rotate for a certain time to further compact the powder cake; after the extraction funnel is disassembled, the powder pressing drill resets to enable the powder pressing drill to reset with the clutch transmission device, and then the next grinding process is started. The utility model discloses changed current automatic cloth powder coffee machine's electronic control mode, made coffee machine's bean grinder mechanism simple more compact, realized powder volume control, automatic cloth powder and compaction operation through mechanical control's mode, the reliability is stronger, and the cost is lower, can further popularize and apply in various relevant field equipment.

According to the scheme, the powder pressing drill is provided with a follow-up sleeve, the follow-up sleeve is of a hollow pipe structure with an opening at the upper end, and the lower end of the main shaft penetrates through the upper opening of the follow-up sleeve; the main shaft passes through the servo bushing and connects and drive the powder drill, the inner wall of servo bushing's upper port is equipped with the spout, is equipped with the sliding key on the outer wall of main shaft lower extreme, and the sliding key can be followed the spout and moved from top to bottom and rather than constituting the key-type connection, and mobilizable key-type connection mode has guaranteed the circumferential direction that main shaft drive pressed the powder drill, and along with powder volume and thickness increase in the extraction funnel simultaneously, make the powder drill can follow the main shaft and upwards move about, and then through servo bushing control clutch transmission's state.

A compression spring is arranged in an inner cavity of the follow-up sleeve, and two ends of the compression spring respectively abut against the sealing end of the follow-up sleeve and the lower end face of the main shaft; the compression spring is used for resetting the follow-up sleeve and the powder pressing drill, and meanwhile, the compression spring applies pressure on the follow-up sleeve to provide downward acting force for the powder pressing drill so as to release pressure on powder cakes in the extraction funnel to ensure the compaction effect.

According to the scheme, the grinding assembly comprises an outer grinding sleeve, an inner grinding wheel and a pipe shaft sleeve, wherein the outer grinding sleeve, the inner grinding wheel and the pipe shaft sleeve are sequentially sleeved on the main shaft from outside to inside, and the outer grinding sleeve is fixedly connected to the bean grinder; the main shaft and the pipe shaft sleeve are coaxially arranged and are respectively connected to the bean grinder through bearings, and the inner grinding wheel is fixedly connected with the lower end of the pipe shaft sleeve; the inner grinding wheel is connected with the clutch transmission device in a matching way; the clutch transmission device drives the inner grinding wheel to rotate on the main shaft, and the inner grinding wheel and the outer grinding sleeve form relative circumferential motion, namely, grinding of coffee beans into powder is realized through grinding teeth arranged in pairs; the pipe shaft sleeve is used for connecting the inner grinding wheel to enable the inner grinding wheel to be positioned in the outer grinding wheel to keep a rotatable state, clearance fit exists between the pipe shaft sleeve and the main shaft, the concentric arrangement mode of the components facilitates the compact design of the structure of the bean grinder, and meanwhile, the operation stability between the components is guaranteed.

According to the scheme, the clutch transmission device comprises a chassis and a driving gear, wherein a clutch bin is arranged at the lower end of the inner grinding wheel, the chassis is fixed on the lower port of the inner grinding wheel, and a meshing disc matched with the driving gear is arranged on the chassis; the driving gear is movably arranged in the clutch bin, and the upper end of the follow-up sleeve penetrates through the chassis and the meshing disc and then is connected with the driving gear to form an integral structure; the inner grinding wheel and the chassis are fixedly connected to form an integral structure, the chassis is provided with a through hole, the meshing disc is arranged around the through hole, the follow-up sleeve concentrically penetrates through the through hole to enable the driving gear to be connected with the meshing disc, and when the powder pressing drill is pushed to move upwards to a limit position by the gradually increased cake thickness, the driving gear is disconnected from the meshing disc, so that the inner grinding wheel stops rotating and does not grind any more, and the powder amount and the cake thickness in the extraction funnel are controlled.

According to the scheme, the lower end of the bean box is provided with the adapter, the adapter is provided with the motor and the speed reducer, and the lower end of the adapter and the upper end of the bean grinder form detachable connection; the adapter is used as a transitional connecting mechanism between the bean box and the bean grinder, and a channel hole for communicating the bean box and the bean grinder is arranged in the adapter, so that coffee beans in the bean box enter the bean grinder; the bean grinder is characterized in that a motor and a speed reducer are arranged on the adapter, a spline coupler is arranged in a lower port of the adapter, the motor and the speed reducer are in transmission connection with the spline coupler, an input coupler is arranged in an upper port of the bean grinder, and the upper end of a main shaft is fixedly connected with the input coupler; the utility model realizes the simplification of the whole structure by driving and controlling the grinding component and the powder pressing drill on the bean grinder through a single motor; and the control of the grinding amount is related to the design of the thickness of the powder cake in the extraction funnel, and after the powder amount meets the set value, the compaction operation can be carried out through delayed setting, so that the logic control is simpler.

According to the scheme, the powder pressing drill comprises an adapter, N fan-shaped blades are arranged on the periphery of the adapter, N is a positive integer larger than 2, the fan-shaped blades are helical blades, and the N fan-shaped blades are sequentially arranged on the same circular plane at equal intervals; a lead angle gap exists between the spiral fan-shaped blades, and the gap is used for forming a powder passing channel between the bean grinder and the extraction funnel; meanwhile, the fan-shaped blades can break up coffee powder in the extraction funnel to prevent agglomeration in the rotating process of the rotary powder pressing drill, and the powder pressing drill compacts the powder cake under the action of pressure applied by the compression spring along with the increase of the powder quantity, so that the requirement of an extraction process is met.

According to the scheme, the upper end of the adapter is provided with a countersunk hole, the lower end of the follow-up sleeve is arranged in the countersunk hole in a penetrating manner, and the adapter and the follow-up sleeve form fixed connection in the axial direction through screws; fan-shaped convex blocks are arranged on the bottom surface of the countersunk hole and the lower end surface of the follow-up sleeve, and the central angle of each fan-shaped convex block is C, so that the C is less than or equal to 90 degrees; fan-shaped lug between adapter and the follow-up sleeve pipe is used for the transmission of the two, and under the shutdown state, has 180 rotation allowances within the range between adapter and the follow-up sleeve pipe, presses the powder to bore promptly and can overturn 180 on the follow-up sleeve pipe, its aim at: after the motor stalls, the beans grinder shuts down, and the powder of this moment bores because of compression spring's thrust effect, still with the surface of the pressed powder cake that great dynamics stops, and the rotatory dismantlement direction of general extraction funnel is opposite with the spiral direction that the powder was bored to the pressure, and the surface of pressed powder cake has destroyed probably, but through the reversal allowance of adapter, makes the powder of pressing bore along with the extraction funnel synchronous reversal in order to dismantle, guarantees that the surface of pressed powder cake after the compaction is complete.

The utility model discloses a coffee machine grinds beans device adopts a motor drive to grind beans ware, grinds between subassembly and the powder pressing drill through separation and reunion connection, when the grinding volume of coffee beans satisfies the setting value, because of the increase of cake thickness, the powder pressing drill is lifted and breaks off the connection with grinding the subassembly; the powder pressing drill can continue to perform powder distribution and compaction operations on the coffee powder in the extraction funnel, the whole structure is simple and compact, the whole cost of the coffee machine can be effectively reduced, and the application and popularization potential is large.

Drawings

FIG. 1 is a schematic view of the overall exploded structure of the present invention;

FIG. 2 is a schematic view of a part of the bean box and the adapter of the present invention;

FIG. 3 is a schematic view of the bean grinder of the present invention;

FIG. 4 is a schematic view of the exploded structure of the bean grinder of the present invention;

FIG. 5 is a schematic cross-sectional view of the grinding assembly and clutch actuator of the present invention;

FIG. 6 is a schematic view of the assembly structure of the main shaft and the servo sleeve of the present invention;

FIG. 7 is a schematic view of the grinding assembly and the compact drill of the present invention;

FIG. 8 is a schematic view of the assembly structure of the servo sleeve and the powder drill of the present invention;

fig. 9 is a schematic structural view of the clutch transmission device of the present invention.

In the figure:

1. a bean box; 2. a bean grinder; 3. powder pressing and drilling; 11. an extraction funnel; 12. an adapter; 13. a motor and a reducer; 14. a spline coupler; 15. an input coupling; 21. a grinding assembly; 22. a main shaft; 23. a sliding key; 24. externally grinding the sleeve; 25. an inner grinding wheel; 26. a pipe shaft sleeve; 27. a chassis; 28. an engaging disk; 31. a servo sleeve; 32. a chute; 33. a compression spring; 34. a drive gear; 35. an adapter; 36. an adapter; 37. a countersunk hole; 38. and a fan-shaped convex block.

Detailed Description

The technical solution of the present invention will be described below with reference to the accompanying drawings and examples.

As shown in fig. 1-9, the bean grinding device of the coffee machine of the present invention comprises a bean box 1, a bean grinder 2 and an extraction funnel 11, wherein the bean box 1, the bean grinder 2 and the extraction funnel 11 are sequentially connected in a matching manner, and a grinding assembly 21 and a main shaft 22 which can respectively rotate are arranged in the bean grinder 2; a powder pressing drill 3 is arranged in the lower port of the bean grinder 2, the powder pressing drill 3 is connected with the lower end of the main shaft 22 in a matching manner, so that the powder pressing drill 3 can rotate circumferentially along with the main shaft 22 and the powder pressing drill 3 can move up and down along the main shaft 22; the powder pressing drill 3 is provided with a clutch transmission device capable of driving the grinding assembly 21; the main shaft 22 directly drives the powder pressing drill 3, and the powder pressing drill 3 is linked with the grinding assembly 21 through a clutch transmission device; coffee beans in the bean box 1 enter the bean grinder 2 and are ground into coffee powder by the grinding assembly 21, the coffee powder falls into the extraction funnel 11 from the lower port of the bean grinder 2, and the powder pressing drill 3 performs powder distribution and compaction treatment on the coffee powder accumulated in the extraction funnel 11.

The increase of the component in the extraction funnel 11 causes the increase of the thickness of the powder cake, the upward movement of the powder pressing drill 3 along the main shaft 22 is pushed, and the upward stroke of the powder pressing drill 3 can disconnect a clutch transmission device so as to stop the work of the grinding assembly 21; at this time, the bean grinder 2 does not grind any more but the powder pressing drill 3 can continuously push the residual coffee powder in the bean grinder into the extraction funnel 11 and continuously rotate for a certain time to further compact the powder cake; after the extraction funnel 11 is disassembled, the powder pressing drill 3 is reset to reset the connection between the powder pressing drill and the clutch transmission device, so that the next grinding process is started. The utility model discloses changed current automatic cloth powder coffee machine's electronic control mode, made coffee machine's 2 simple compactors of beans grinder mechanism, realized powder volume control, automatic cloth powder and compaction operation through mechanical control's mode, the reliability is stronger, and the cost is lower, can further popularize and apply in various relevant field equipment.

The powder pressing drill 3 is provided with a follow-up sleeve 31, the follow-up sleeve 31 is of a hollow tube structure with an opening at the upper end, and the lower end of the main shaft 22 penetrates through the upper opening of the follow-up sleeve 31; the main shaft 22 is connected and driven by the servo sleeve 31 to press the powder drill 3, the inner wall of the upper port of the servo sleeve 31 is provided with a chute 32, the outer wall of the lower end of the main shaft 22 is provided with a sliding key 23, the sliding key 23 can move up and down along the chute 32 and is connected with the chute to form a key, the circumferential rotation of the main shaft 22 driven by the powder drill 3 is ensured by the movable key connection mode, and meanwhile, the powder amount and the thickness in the extraction funnel 11 are increased, so that the powder drill 3 can move up along the main shaft 22, and the clutch transmission device is controlled by the servo sleeve 31.

A compression spring 33 is arranged in the inner cavity of the follow-up sleeve 31, and two ends of the compression spring 33 respectively abut against the sealing end of the follow-up sleeve 31 and the lower end face of the main shaft 22; the compression spring 33 is used for resetting the follow-up sleeve 31 and the powder drill 3, and meanwhile, the compression spring 33 applies pressure on the follow-up sleeve 31 to provide downward acting force for the powder drill 3 to release pressure on the powder cake in the extraction funnel 11 so as to ensure a compaction effect.

The grinding assembly 21 comprises an outer grinding sleeve 24, an inner grinding wheel 25 and a pipe shaft sleeve 26, the outer grinding sleeve 24, the inner grinding wheel 25 and the pipe shaft sleeve 26 are sequentially sleeved on the main shaft 22 from outside to inside, and the outer grinding sleeve 24 is fixedly connected to the bean grinder 2; the main shaft 22 and the pipe shaft sleeve 26 are coaxially arranged and are respectively connected to the bean grinder 2 through bearings, and the inner grinding wheel 25 is fixedly connected with the lower end of the pipe shaft sleeve 26; the inner grinding wheel 25 is connected with the clutch transmission device in a matching way; the clutch transmission device drives the inner grinding wheel 25 to rotate on the main shaft 22, the inner grinding wheel 25 and the outer grinding sleeve 24 form relative circumferential motion, namely, grinding of coffee beans into powder is realized through grinding teeth which are arranged in a matched mode; the pipe sleeve 26 is used for connecting the inner grinding wheel 25 to enable the inner grinding wheel to be in a rotatable state in the outer grinding wheel, clearance fit exists between the pipe sleeve 26 and the main shaft 22, the concentric arrangement mode of the components is convenient for the compact design of the bean grinder 2, and meanwhile, the operation stability between the components is guaranteed.

The clutch transmission device comprises a chassis 27 and a driving gear 34, a clutch bin is arranged at the lower end of the inner grinding wheel 25, the chassis 27 is fixed on the lower port of the inner grinding wheel 25, and a meshing disc 28 matched with the driving gear 34 is arranged on the chassis 27; the driving gear 34 is movably arranged in the clutch bin, and the upper end of the follow-up sleeve 31 penetrates through the chassis 27 and the meshing disc 28, and then the upper end of the follow-up sleeve 31 is connected with the driving gear 34 to form an integral structure; the inner grinding wheel 25 and the chassis 27 are fixedly connected to form an integral structure, the chassis 27 is provided with a through hole, the meshing disc 28 is arranged around the through hole, the follow-up sleeve 31 concentrically penetrates through the through hole to enable the driving gear 34 to be connected with the meshing disc 28, when the powder pressing drill 3 is pushed to move upwards to a limit position by the increasing cake thickness, the driving gear 34 is disconnected from the meshing disc 28, the inner grinding wheel 25 stops rotating and does not grind any more, and therefore the powder amount and the cake thickness in the extraction funnel 11 are controlled.

The lower end of the bean box 1 is provided with an adapter 12, the adapter 12 is provided with a motor and a speed reducer 13, and the lower end of the adapter 12 and the upper end of the bean grinder 2 form detachable connection; the adapter 12 is used as a transition connection mechanism between the bean box 1 and the bean grinder 2, and a channel hole for communicating the bean box 1 and the bean grinder 2 is arranged in the adapter 12, so that coffee beans in the bean box 1 enter the bean grinder 2; the bean grinder is characterized in that a motor and a speed reducer 13 are arranged on the adapter 12, a spline coupler 14 is arranged in a lower port of the adapter 12, the motor and the speed reducer 13 are in transmission connection with the spline coupler 14, an input coupler 15 is arranged in an upper port of the bean grinder 2, and the upper end of a main shaft 22 is fixedly connected with the input coupler 15; the utility model realizes the simplification of the whole structure by driving and controlling the grinding component 21 and the powder pressing drill 3 on the bean grinder 2 through a single motor; and the control of the grinding powder amount is related to the design of the thickness of the powder cake in the extraction funnel 11, after the powder amount meets the set value, the compaction operation can be carried out through time delay setting, and the logic control is simpler.

The powder pressing drill 3 comprises an adapter 35, N fan-shaped blades 36 are arranged on the periphery of the adapter 35, N is a positive integer larger than 2, the fan-shaped blades 36 are helical blades, and the N fan-shaped blades 36 are sequentially arranged on the same circular plane at equal intervals; a lead angle gap exists between the spiral fan-shaped blades 36, and the gap is used for forming a powder flowing channel between the bean grinder 2 and the extraction funnel 11; meanwhile, the fan-shaped blades 36 can break up the coffee powder in the extraction funnel 11 to prevent agglomeration in the rotating process of the rotary powder pressing drill 3, and the powder pressing drill 3 compacts the powder cake under the action of the pressure exerted by the compression spring 33 along with the increase of the powder amount, so that the requirement of the extraction process is met.

The upper end of the adapter 35 is provided with a counter bore 37, the lower end of the follow-up sleeve 31 is arranged in the counter bore 37 in a penetrating manner, and the adapter 35 and the follow-up sleeve 31 form axial fixed connection through screws; fan-shaped convex blocks 38 are arranged on the bottom surface of the counter sink 37 and the lower end surface of the follow-up sleeve 31, and the central angle of each fan-shaped convex block 38 is C, so that the C is less than or equal to 90 degrees; fan-shaped lug 38 between adapter 35 and the follow-up sleeve 31 is used for the transmission of the two, and under the stall state, has 180 rotation allowances within the scope between adapter 35 and the follow-up sleeve 31, and powder drill 3 can be on the follow-up sleeve 31 reversal 180 promptly, its aim at: after the motor stalls, grind beans ware 2 and shut down, the powder drill 3 still uses the surface of the cake that great dynamics stopped because of compression spring 33's thrust effect this moment, and the rotatory dismantlement direction of general extraction funnel 11 is opposite with the spiral direction of powder drill 3, and the surface of cake has the destroyed possibility, but through adapter 35 reversal allowance, makes powder drill 3 along with extraction funnel 11 synchronous reversal in order to dismantle, guarantees that the surface of cake after the compaction is complete.

The above is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles in accordance with the claims of the present invention are included in the claims of the present invention.

Claims (7)

1. A bean grinding device of a coffee machine comprises a bean box, a bean grinder and an extraction funnel, and is characterized in that,

the bean box, the bean grinder and the extraction funnel are sequentially connected in a matching way,

a grinding component and a main shaft which can rotate respectively are arranged in the bean grinder;

a powder pressing drill is arranged in the lower port of the bean grinder and is in fit connection with the lower end of the main shaft, so that the powder pressing drill can rotate circumferentially along with the main shaft and can move up and down along the main shaft;

and the powder pressing drill is provided with a clutch transmission device capable of driving the grinding assembly.

2. The coffee grinder bean grinding device of claim 1, wherein the powder pressing drill is provided with a follow-up sleeve, the follow-up sleeve is of a hollow tube structure with an open upper end, and the lower end of the main shaft penetrates through the upper port of the follow-up sleeve; the inner wall of the upper port of the follow-up sleeve is provided with a sliding chute, the outer wall of the lower end of the main shaft is provided with a sliding key, and the sliding key can move up and down along the sliding chute and form a key connection with the sliding key; and a compression spring is arranged in the inner cavity of the follow-up sleeve, and two ends of the compression spring respectively abut against the sealing end of the follow-up sleeve and the lower end face of the main shaft.

3. The coffee bean grinding device of claim 1, wherein the grinding assembly comprises an outer grinding sleeve, an inner grinding wheel and a pipe shaft sleeve, the outer grinding sleeve, the inner grinding wheel and the pipe shaft sleeve are sequentially sleeved on the main shaft from outside to inside, and the outer grinding sleeve is fixedly connected to the bean grinder; the main shaft and the pipe shaft sleeve are coaxially arranged and are respectively connected to the bean grinder through bearings, and the inner grinding wheel is fixedly connected with the lower end of the pipe shaft sleeve; the inner grinding wheel is connected with the clutch transmission device in a matching way.

4. The coffee bean grinding device of claim 3, wherein the clutch transmission device comprises a chassis and a driving gear, the lower end of the inner grinding wheel is provided with a clutch bin, the chassis is fixed on the lower port of the inner grinding wheel, and the chassis is provided with a meshing disc matched with the driving gear; the driving gear is movably arranged in the clutch bin, and the upper end of the follow-up sleeve penetrates through the chassis and the meshing disc and then is connected with the driving gear to form an integral structure.

5. A coffee grinder device according to any one of claims 1 to 4, wherein the lower end of the bean box is provided with an adapter, the adapter is provided with a motor and a reducer, and the lower end of the adapter and the upper end of the bean grinder form a detachable connection; be equipped with motor and reduction gear on the adapter, be equipped with the spline shaft coupling in the lower port of adapter, motor and reduction gear and spline shaft coupling transmission are connected, are equipped with the input shaft coupling in the last port of bean grinder, main shaft upper end and input shaft coupling fixed connection.

6. The coffee grinder of claim 2, wherein the powder drill includes an adapter, and N fan-shaped blades are disposed on the outer circumference of the adapter, wherein N is a positive integer greater than 2, the fan-shaped blades are helical blades, and the N fan-shaped blades are sequentially disposed on the same circular plane at equal intervals.

7. The coffee bean grinding device of claim 6, wherein the upper end of the adapter is provided with a countersunk hole, the lower end of the follow-up sleeve is arranged in the countersunk hole, and the adapter and the follow-up sleeve form an axial fixed connection through a screw; fan-shaped convex blocks are arranged on the bottom surface of the countersunk hole and the lower end surface of the follow-up sleeve, and the central angle of each fan-shaped convex block is C, so that the C is less than or equal to 90 degrees.

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