A grinder and coffee maker

Abstract

The application provides a coffee grinder and a coffee machine, and belongs to the technical field of coffee machines. The coffee grinder comprises a support, a bottom plate arranged on the support, a powder receiving position and a powder falling position arranged on the bottom plate, and a powder falling opening arranged on the powder falling position; a grinding assembly fixed on the support; and a powder moving assembly comprising a powder moving barrel arranged vertically on the bottom plate and a driving mechanism for moving the powder moving barrel between the powder receiving position and the powder falling position. In the powder receiving position, the top open end of the powder moving barrel is opposite to the powder outlet of the grinding assembly, and the powder moving barrel and the bottom plate are matched to form a powder storage cavity in the powder moving barrel to receive the coffee powder ground by the grinding assembly. In the powder falling position, the powder moving barrel is opposite to the powder falling opening to make the coffee powder in the powder storage cavity fall. The coffee grinder can make the particle distribution of the pressed powder cake inside the coffee grinder be substantially uniform and consistent, and can avoid the channel effect in the process of making coffee to the greatest extent.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of coffee machines, in particular to a coffee grinder and a coffee machine. BACKGROUND

[0002] When brewing coffee by using a coffee machine, coffee beans are generally ground into coffee powder first, and then the coffee powder is pressed into a powder cake, and finally hot water is poured on the powder cake to make espresso.

[0003] For example, a device for grinding coffee powder is provided in Chinese patent CN 111132585 A, which includes a grinder, a support for fixing a grinding cup, and a pressing piston for making a powder cake. When making a powder cake, the grinding cup is placed on the support to receive the coffee powder ground by the grinder, and then the received coffee powder is pressed by the pressing piston at the top to form a powder cake. The coffee powder ground by the device is not pretreated (such as stirring) before being pressed into a powder cake, and the coffee powder may form clumps, resulting in uneven gaps between the coffee powder particles in the powder cake. When brewing coffee, hot water may flow through the powder cake, causing a channeling effect.

[0004] Meanwhile, in the technical solution disclosed in the device, coffee powder does not fall vertically into the grinding cup, but falls into the cup body from one side of the cup opening. It is difficult to ensure that the coffee powder accumulated in the grinding cup is uniformly distributed below the pressing piston, and it is usually eccentric. Therefore, the powder cake pressed by the pressing piston may have the phenomenon of being tight (with more powder) on one side and loose (with less powder) on the other side, which is not conducive to brewing coffee. SUMMARY

[0005] In view of the above technical problems existing in the prior art, the present application provides a coffee grinder and a coffee machine. The coffee grinder can make the distribution of particles in the pressed powder cake inside it substantially uniform and consistent, thereby avoiding the channeling effect in the process of making coffee to the greatest extent.

[0006] The technical solution adopted by the embodiment of the present application is:

[0007] A coffee grinder, characterized in that the coffee grinder comprises:

[0008] a bracket, a bottom plate is arranged on the bracket, a powder receiving position and a powder falling position are arranged on the bottom plate, and a powder falling opening is arranged in the powder falling position;

[0009] a grinding assembly fixed on the bracket;

[0010] The powder moving assembly comprises a powder moving barrel vertically arranged on the bottom plate, and a driving mechanism for moving the powder moving barrel between the powder receiving position and the powder dropping position. In the powder receiving position, the top open end of the powder moving barrel is opposite to the powder outlet of the grinding assembly, and the powder moving barrel and the bottom plate cooperate to form a powder storage cavity in the powder moving barrel to receive the coffee powder ground by the grinding assembly. In the powder dropping position, the powder moving barrel is opposite to the powder dropping outlet to drop the coffee powder in the powder storage cavity.

[0011] Further, the bean grinder further comprises:

[0012] A stirring member arranged in the powder moving barrel, the stirring member being used to rotate in the powder moving barrel to stir the coffee powder in the powder storage cavity;

[0013] A stirring driving gear rotatably arranged on the support at a position corresponding to the powder receiving position;

[0014] A magnet assembly comprising a first magnet arranged on the stirring member and a second magnet arranged on the stirring driving gear, when the powder moving barrel moves to the powder receiving position, the stirring member is attracted by the first magnet and the second magnet to connect with the stirring driving gear and can rotate with the stirring driving gear. This structure realizes stirring while dropping powder to eliminate the clumps and static electricity in the coffee powder.

[0015] Further, a third magnet is arranged on the bottom of the powder moving barrel, the third magnet being used to keep the bottom of the powder moving barrel in contact with the bottom plate when the powder moving barrel is stationary or moves relative to the bottom plate; this structure can ensure the dynamic sealing effect of the powder moving barrel and the bottom plate during movement, thereby avoiding the leakage of coffee powder from the powder moving barrel.

[0016] And / or, the grinding assembly comprises a bean grinding power mechanism, the bean grinding power mechanism being in transmission connection with the stirring driving gear, so that the bean grinding power mechanism can drive the stirring driving gear to rotate when grinding coffee beans. This structure can realize simultaneous grinding and dropping of coffee powder and stirring of coffee powder.

[0017] Further, the driving mechanism comprises:

[0018] A powder moving motor fixed on the support;

[0019] A mounting fork in detachable connection with the rotating shaft of the powder moving motor and the powder moving barrel respectively, the powder moving motor being able to drive the mounting fork to swing to move the powder moving barrel relative to the bottom plate to switch between the powder receiving position and the powder dropping position.

[0020] Further, one end of the mounting fork is provided with a C-shaped ring, and the powder moving barrel can be clamped into or out of the C-shaped ring to be connected or separated from the mounting fork. This structure can quickly realize the installation and disassembly of the powder moving barrel.

[0021] Further, the coffee grinder further comprises:

[0022] The powder pressing assembly is located above the powder outlet, and comprises a piston cylinder fixed on the support and a powder pressing piston arranged in the piston cylinder and capable of moving in the vertical direction. The powder pressing piston can move downward through the powder outlet to compact the coffee powder falling into the hopper assembly and form a powder cake. This structure enables the coffee grinder to not only realize the grinding and stirring of coffee powder, but also realize the making of powder cake.

[0023] Further, the powder pressing assembly further comprises:

[0024] The transmission assembly is located in the piston cylinder, and comprises a screw rod arranged vertically and a screw rod sleeve sleeved on the screw rod. When the screw rod sleeve rotates, it can drive the screw rod to rotate while moving along the axis of the screw rod sleeve. The powder pressing piston is connected with the screw rod and can move with the screw rod;

[0025] The drive assembly comprises a screw motor and a gear mechanism connecting the screw motor and the screw rod sleeve. The screw motor drives the screw rod sleeve to rotate through the gear mechanism. This structure can realize the downward pressing and rotation of the powder pressing piston, which can achieve the purpose of uniform coffee paving.

[0026] Further, the gear mechanism comprises a screw gear connected with the screw rod sleeve, and the powder pressing assembly further comprises:

[0027] The optical coupler is fixed on the piston cylinder and located outside the screw gear. The optical coupler can emit light in the vertical direction, and each tooth of the screw gear can block the light when the screw gear rotates to increase the number of pulses of the optical coupler;

[0028] The operation device is connected with the optical coupler to receive the number of pulses and calculate the moving distance of the powder pressing piston and the thickness of the powder cake according to the increased number of pulses, the pitch of the screw gear and the number of teeth of the screw gear;

[0029] Wherein: s = p*n / z;

[0030] s represents the moving distance of the powder pressing piston; p represents the pitch of the screw gear; z represents the number of teeth of the screw gear; n represents the number of pulses increased by the optical coupler. This structure can measure the distance of the downward movement of the powder pressing piston, and then obtain the thickness of the powder cake.

[0031] Further, the powder pressing assembly further comprises a safety switch electrically connected with the screw motor, the closing and opening of the safety switch is used for controlling the closing and opening of the screw motor, a mounting snap ring is arranged below the powder outlet on the support, the mounting snap ring is used for connecting the funnel assembly, a plug rod electrically connected with the safety switch is arranged on the mounting snap ring, and the funnel assembly can touch the plug rod to make the safety switch close when the funnel assembly is arranged on the mounting snap ring. The structure can ensure that the powder pressing piston cannot move downward when the grinder is not installed with the funnel assembly, so that the collision with the moving powder moving barrel is avoided.

[0032] A coffee machine comprises the grinder according to any one of the above embodiments.

[0033] Compared with the prior art, the grinder has the following beneficial effects:

[0034] The powder moving barrel in the grinder can move between the powder receiving position and the powder falling position on the bottom plate of the support, the powder moving barrel receives the coffee powder in the powder receiving position, the coffee powder in the powder storage cavity cannot be eccentric because the top of the powder moving barrel is open and the powder outlet of the grinding assembly is opposite to the top, the coffee powder can be uniformly poured out through the powder falling outlet when the powder moving barrel moves to the powder falling position, so that the powder cake is pressed by the powder pressing piston, the particles in the powder cake are uniformly distributed, and the channel effect in the process of making coffee is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a three-dimensional structure schematic view of the grinder according to the embodiment of the present application;

[0036] Figure 2 It is a main sectional view of the grinder according to the embodiment of the present application;

[0037] Figure 3 It is a top view of the powder moving assembly mounted on the support according to the embodiment of the present application;

[0038] Figure 4 It is a structure schematic view of the powder moving barrel in the powder receiving position according to the embodiment of the present application;

[0039] Figure 5 It is a structure schematic view of the powder moving barrel in the powder falling position according to the embodiment of the present application;

[0040] Figure 6 It is a structure schematic view of the grinding assembly according to the embodiment of the present application;

[0041] Figure 7 It is an assembly structure schematic view of the grinding assembly, the stirring driving gear and the stirring piece according to the embodiment of the present application;

[0042] Figure 8The exploded view of the stirring driving gear and the stirring element of the embodiment of the present application;

[0043] Figure 9 The structural schematic diagram of the stirring driving gear assembled on the support of the embodiment of the present application;

[0044] Figure 10 The structural schematic diagram of the powder moving assembly of the embodiment of the present application;

[0045] Figure 11 The main sectional view of the powder moving barrel of the embodiment of the present application;

[0046] Figure 12 The sectional view of the powder moving barrel clamped on the mounting fork of the embodiment of the present application;

[0047] Figure 13 The sectional view of the powder moving barrel disengaged from the mounting fork of the embodiment of the present application;

[0048] Figure 14 The structural schematic diagram of the powder pressing assembly of the embodiment of the present application;

[0049] Figure 15 The main sectional view of the powder pressing assembly of the embodiment of the present application;

[0050] Figure 16 The internal structural schematic diagram of the powder pressing assembly of the embodiment of the present application;

[0051] Figure 17 The structural schematic diagram of the optical coupler of the embodiment of the present application;

[0052] Figure 18 The structural schematic diagram of the coffee powder pressed by the powder pressing piston of the embodiment of the present application;

[0053] Figure 19 The structural schematic diagram of the funnel assembly pre-assembled on the support of the embodiment of the present application;

[0054] Figure 20 The cooperation relationship diagram of the optical coupler and the screw gear of the embodiment of the present application;

[0055] Figure 21 The exploded view of the support of the embodiment of the present application;

[0056] Figure 22 The structural schematic diagram of the coffee machine of the embodiment of the present application.

[0057] In the figure:

[0058] 1-Coffee machine; 10-Display screen; 2-Grinder; 20-Stand; 20-Base plate; 201-Powder outlet; 202-Top cover; 203-Middle plate; 204-Bottom cover; 205-Mounting retainer; 206-First through hole; 207-Connecting post; 208-Second through hole; 21-Grinding assembly; 210-Grinding power mechanism; 211-Grinding barrel; 212-Output gear; 213-Powder outlet; 22-Tamper assembly; 220-Piston cylinder; 221-Tamper piston; 222-Screw; 2220-Screw sleeve; 223-Screw motor; 224-Optical coupler; 2240-Transmitter; 2241-Receiver; 225-Screw gear; 226-Pressure... Plate; 227-Nut; 228-Position Switch; 229-Plug; 23-Powder Transfer Assembly; 230-Powder Transfer Bucket; 2300-Third Magnet; 2301-Arc-shaped Groove; 2302-Second Snap-fit ​​Part; 2303-Second Snap-fit ​​Slot; 231-Drive Mechanism; 2310-Moving Motor; 2311-Mounting Fork; 2312-C-ring; 2313-First Snap-fit ​​Part; 2312-First Snap-fit ​​Slot; 232-Stirring Component; 2320-Stirring Base; 2321-Stirring Needle; 233-Stirring Drive Gear; 234-Magnet Assembly; 2340-First Magnet; 2341-Second Magnet; 235-First Limit Switch; 236-Second Limit Switch; 3-Function Funnel Assembly. Detailed Implementation

[0059] To enable those skilled in the art to better understand the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0060] This invention provides a coffee grinder. For example... Figures 1-2 As shown, the grinder 2 includes a support 20, a grinding component 21, and a powder transfer component 23.

[0061] like Figure 1 As shown, the support 20 has a base plate 200, which has a powder receiving position and a powder dispensing position, wherein the powder dispensing position has a powder dispensing port 201. The grinding assembly 21 is fixed on the support 20 and is used to grind coffee beans into coffee powder.

[0062] The powder transfer assembly 23 includes a powder transfer container 230 vertically mounted on the base plate 200 and a drive mechanism 231 for moving the powder transfer container 230 between a powder receiving position and a powder dropping position on the base plate 200. Figure 3 .

[0063] like Figure 4As shown, when the powder removal barrel 230 is located at the powder receiving position, the top open end of the powder removal barrel 230 is opposite to the powder outlet 213 of the grinding assembly 21, and the powder removal barrel 230 and the bottom plate 200 cooperate to form a powder storage cavity in the powder removal barrel 230 to receive the coffee powder ground by the grinding assembly 21. As shown Figure 5 As shown, when the powder removal barrel 230 is located at the powder falling position, the powder removal barrel 230 is opposite to the powder falling port 201 to make the coffee powder in the powder storage cavity fall down.

[0064] It should be noted that the powder removal barrel 230 of the embodiment is a ring structure or a cylindrical structure with both ends open. At the powder receiving position, the bottom surface of the powder removal barrel 230 is attached to the surface of the bottom plate 200, and the bottom open end of the powder removal barrel 230 is closed by the bottom plate 200, and the inside of the powder removal barrel 230 can form a powder storage cavity for containing coffee powder. At the powder falling position, the bottom open end of the powder removal barrel 230 is opposite to the powder falling port 201, that is, the bottom open end of the powder removal barrel 230 is opened, so that the coffee powder in the powder removal barrel 230 can fall from the powder falling port 201.

[0065] The powder removal barrel 230 in the bean grinder 2 of the embodiment can move between the powder receiving position and the powder falling position on the bottom plate 200 of the support 20. At the powder receiving position, the powder removal barrel 230 receives coffee powder. Since the top open end of the powder removal barrel 230 is opposite to the powder outlet 213 of the grinding assembly 21, the coffee powder in the powder storage cavity will not deviate from the center. When the powder removal barrel 230 can move to the powder falling position to uniformly fall through the powder falling port 201, it is convenient for the subsequent powder pressing piston 221 to press the powder cake, and the particle distribution in the pressed powder cake is roughly uniform, which maximizes the avoidance of the channeling effect in the process of making coffee.

[0066] As shown, Figure 6 The grinding assembly 21 of the embodiment includes a grinding barrel 211, a bean grinding power mechanism 210 arranged on the grinding barrel 211, and a powder outlet 213. The powder outlet 213 corresponds to the powder receiving position on the bottom plate 200. When the powder removal barrel 230 moves to the powder receiving position, the powder outlet 213 on the grinding barrel 211 is located above the powder removal barrel 230 and opposite to the upper open end of the powder removal barrel 230. At this time, the user can place coffee beans in the grinding barrel 211, grind the coffee beans into coffee powder by the bean grinding power mechanism 210, and then drop the ground coffee powder into the powder removal barrel 230 through the powder outlet 213.

[0067] As for the specific structure of the bean grinding power mechanism 210 of the embodiment, it belongs to the prior art, and will not be described here.

[0068] As shown, Figures 7-8 In some embodiments, the powder removal assembly 23 further includes a stirring drive gear 233, a magnet assembly, and a stirring piece 232 arranged in the powder removal barrel 230.

[0069] The stirring component 232 is used to move and stir the coffee powder in the powder storage chamber when the powder transfer container 230 is moved to the powder receiving position.

[0070] The stirring drive gear 233 is rotatably set on the bracket 20 at a position corresponding to the powder receiving position, and is also set above the powder receiving position. The stirring drive gear 233 is used to drive the stirring component 232 to rotate inside the powder receiving container 230 to stir the coffee powder when the powder transfer container 230 moves to the powder receiving position.

[0071] The magnet assembly includes a first magnet 2340 and a second magnet 2341. The first magnet 2340 is disposed on the stirring component 232, and the second magnet 2341 is disposed on the stirring drive gear 233.

[0072] When the powder transfer container 230 moves to the powder receiving position, the stirring element 232 is attracted to the stirring drive gear 233 by the first magnet 2340 and the second magnet 2341. In this way, the rotation of the stirring drive gear 233 can drive the stirring element 232 to rotate. When the powder transfer container 230 moves from the powder receiving position to the powder dropping position, it will cause the stirring element 232 to separate from the stirring drive gear 233, so as not to affect the movement of the powder transfer container 230.

[0073] It is easy to see that the stirring element 232 and the powder transfer container 230 in this embodiment are not fixedly connected, but are movably arranged inside the powder transfer container 230. The stirring element 232 can move freely up and down inside the powder transfer container 230. When the powder transfer container 230 moves to the powder receiving position, the stirring element 232 will move upward under the mutual attraction of the two magnets to dock with the stirring drive gear 233.

[0074] Optionally, in this embodiment, there are multiple first magnets 2340 and multiple second magnets 2341, such as... Figure 8 As shown, multiple first magnets 2340 are evenly arranged on the top of the stirring component 232, and multiple second magnets 2341 are evenly arranged on the stirring drive gear 233. When the powder transfer container 230 moves to the powder receiving position on the bottom plate 200, the first magnets 2340 on the stirring component 232 and the second magnets 2341 on the stirring drive gear 233 face each other and attract each other, at which point the stirring component 232 and the stirring drive gear 233 are fixed together.

[0075] Furthermore, in some embodiments, such as Figure 8 As shown, the stirring component 232 includes a stirring base 2320 and a stirring needle 2321 disposed at the bottom of the stirring base 2320, the stirring needle 2321 extending into the powder transfer container 230.

[0076] The stirring base 2320 has a first through hole at its center, and a first magnet 2340 is arranged around the first through hole. The stirring drive gear 233 has a second through hole at its center, and a second magnet 2341 is arranged around the second through hole. The powder outlet 213 of the grinding component 21 is located above the second through hole. When the powder transfer container 230 moves to the powder receiving position, the first and second through holes are coaxial. Thus, when the stirring drive gear 233 and the stirring component 232 rotate synchronously, the coffee powder ground by the grinding component 21 can fall into the powder transfer container 230 through the first and second through holes, thereby achieving simultaneous powder falling and stirring to eliminate clumping and static electricity in the coffee powder.

[0077] In this embodiment, the stirring drive gear 233 can be connected to a separate power mechanism. When the ground coffee powder enters the powder transfer container 230, the power mechanism can simultaneously control the stirring drive gear 233 to rotate, so as to achieve simultaneous powder transfer and stirring.

[0078] Of course, such as Figure 7 As shown, the stirring drive gear 233 can also mesh with the output gear 212 in the grinding assembly 2. The output gear 212 is connected to the grinding power mechanism 210. When grinding coffee beans, the grinding power mechanism 210 drives the output gear 212 to rotate, and then drives the stirring drive gear 233 to rotate through the output gear 212, so that the beans can be ground and stirred at the same time.

[0079] In some embodiments, such as Figure 11 As shown, a third magnet is provided on the bottom of the coffee transfer container 230, and the base plate 200 of the support 20 is a magnetic plate. The bottom of the coffee transfer container 230 is attracted to the base plate 200 by the third magnet to ensure that it remains in close contact with the base plate 200 when it is in the coffee receiving position and when it moves on the base plate 200, thereby increasing the dynamic sealing effect and preventing coffee powder from leaking out during the movement of the coffee transfer container 230. When the coffee transfer container 230 moves to the coffee leakage position, the bottom opening of the coffee transfer container 230 is opposite to the coffee discharge port 201, thereby spilling the coffee powder.

[0080] like Figure 10 As shown, in some embodiments, the drive mechanism 231 for moving the powder transfer bucket 230 on the base plate 200 mainly includes a powder transfer motor 2310 fixed on the bracket 20 and a mounting fork 2311 connecting the powder transfer motor 2310 and the powder transfer bucket 230. The powder transfer motor 2310 can drive the mounting fork 2311 to swing so that the powder transfer bucket 230 moves relative to the base plate 200 and switches between the powder receiving position and the powder dropping position.

[0081] like Figure 12 and Figure 13As shown, one end of the mounting fork 2311 is provided with a socket, and the rotating shaft of the powder moving motor 2310 can be directly inserted into the socket to drive the mounting fork 2311 to rotate. The other end of the mounting fork 2311 is provided with a C-shaped ring 2312, and the powder moving barrel 230 can be clamped into the C-shaped ring 2312 to be connected with the mounting fork 2311, and can be moved out of the C-shaped ring 2312 to be separated from the mounting fork 2311. This structure can quickly realize the installation and disassembly of the powder moving barrel 230.

[0082] In some embodiments, the outer circumferential surface of the powder moving barrel 230 is provided with an arc-shaped groove 2301 around its axis, which is matched with the C-shaped ring 2312. One end of the C-shaped ring 2312 is provided with a first clamping portion 2313, and the other end is provided with a first clamping groove 2312. One end of the arc-shaped groove 2301 is provided with a second clamping groove 2303, and the other end is provided with a second clamping portion 2302. When the powder moving barrel 230 is clamped into the C-shaped ring 2312, the first clamping portion 2313 is clamped in the second clamping groove 2303, and the second clamping portion 2302 is clamped in the first clamping groove 2312. This connection structure is simple, making the installation of the powder moving barrel 230 convenient.

[0083] As shown in Figure 1 , Figure 14 , Figure 15 and Figure 16 , in some embodiments, the coffee grinder 2 further comprises a powder pressing assembly 22 arranged on the support 20, and the powder pressing assembly 22 is located above the powder falling opening 201. The powder pressing assembly 22 comprises a piston cylinder 220 fixed on the support 20 and a powder pressing piston 221 arranged in the piston cylinder 220. The powder pressing piston 221 can move vertically in the piston cylinder 220. When the powder moving barrel 230 returns to the powder receiving position after spilling the coffee powder in its interior at the powder falling position, the powder pressing piston 221 can move downward to press the spilled coffee powder into a powder cake through the powder falling opening 201, as shown in Figure 18 .

[0084] Specifically, when a user uses the coffee grinder 2, a component for receiving the ground coffee powder, such as a funnel assembly 3, etc., can be fixed at the bottom of the powder falling opening 201 in advance. When the powder moving barrel 230 spatters the stirred coffee powder into the funnel assembly 3 and leaves the powder falling position, the powder pressing piston 221 moves downward to extend into the funnel assembly 3 to press the coffee powder into a powder cake, thereby realizing the production of the powder cake.

[0085] In order to facilitate the cleaning of the part of the powder pressing piston 221 in contact with the coffee powder, as shown in Figure 15 , the bottom of the powder pressing piston 221 of the present embodiment is provided with a pressing plate 226 made of a magnetically conductive material, such as 45# steel or 1j117 material. The compaction of the coffee powder in the funnel assembly 3 through the pressing plate 226 can ensure the flatness of the surface of the produced powder cake.

[0086] In some embodiments, the bottom of the powder pressing piston 221 can also be provided with a plurality of small magnets, and the connection between the powder pressing piston 221 and the pressing plate 226 can be achieved by the adsorption between the small magnets and the surface of the pressing plate 226. In this way, the pressing plate 226 can be directly and regularly disassembled for cleaning without cleaning the powder pressing piston 221.

[0087] In addition, the distance between the bottom pressing plate 226 of the powder pressing piston 221 and the powder falling port 201 in the vertical direction is greater than the height of the powder moving barrel 230 when the powder pressing piston 221 is in the initial position in the piston barrel 220, so as to ensure that the movement of the powder moving barrel 230 is not affected.

[0088] Further, in some embodiments, the powder pressing assembly 22 further comprises a transmission assembly and a power assembly for driving the powder pressing piston 221 to move.

[0089] The transmission assembly is arranged in the piston barrel 220, and the transmission assembly comprises a vertical screw rod 222 and a screw rod sleeve 2220 sleeved on the screw rod 222. When the screw rod sleeve 2220 rotates, the screw rod 222 can rotate and move along the axis of the screw rod sleeve 2220. The piston barrel 220 is connected with the screw rod 222 and can move with the screw rod 222.

[0090] The power assembly comprises a screw rod motor 223 and a gear mechanism outside the piston barrel 220. The screw rod motor 223 is connected with the top of the screw rod sleeve 2220 through the gear mechanism. The screw rod motor 223 is in transmission connection with the screw rod sleeve 2220, and the rotation of the screw rod sleeve 2220 is controlled by the screw rod motor 223.

[0091] The pressing piston 30 of the present embodiment can rotate while moving downward, and can evenly distribute the coffee powder while pressing the coffee powder, thereby playing a role of a powder distributor.

[0092] As shown in FIGS. Figure 15 and Figure 16 The transmission assembly further comprises a nut 227 fixed in the piston barrel 220. The screw rod 222 is arranged in the nut 227 and is in threaded connection with the nut 227. The bottom of the screw rod 227 is connected with the piston barrel 220. In this way, when the screw rod sleeve 2220 rotates, the screw rod 222 moves along the axis of the screw rod sleeve 2220 and rotates under the cooperation of the nut 227.

[0093] It is easy to know that the piston barrel 220 of the present embodiment is respectively provided with position switches 228 in electrical connection with the screw rod motor 223. When the powder pressing piston 221 moves downward or upward to the limit position, the corresponding position switch 228 can be respectively touched to turn off the screw rod motor 223, so as to limit the continuous movement of the powder pressing piston 221.

[0094] The upper limit position here can be understood as the initial position of the powder compression piston 221, and the lower limit position can be understood as the farthest position that the powder compression assembly 22 can move downward without affecting the use of the powder compression assembly 22.

[0095] In addition, for the coffee grinder 2 of the present embodiment, if the powder compression piston 221 is allowed to move up and down when the funnel assembly 3 is not installed, it is unsafe and easy to collide with the moving powder removal bucket 230. The safety switch (not shown in the figure) electrically connected to the screw motor 223 is provided on the powder compression assembly 22 of the present embodiment. When the safety switch is closed, the screw motor 223 can be normally started. When the safety switch is open, the screw motor 223 cannot be started. If the powder compression assembly 22 is not used, the safety switch is always in the open state.

[0096] Further, as shown in Figure 19 The bottom of the support 20 of the present embodiment is provided with a mounting snap ring 205. The funnel assembly 3 for receiving coffee powder can be clamped in the mounting snap ring 205 and clamped with the mounting snap ring 205 after rotating a certain angle along the axis of the mounting snap ring 205. This technology belongs to the prior art, and will not be described here.

[0097] The mounting snap ring 205 is provided with a plug rod 229 electrically connected to the safety switch. When the funnel assembly 3 rotates in the mounting snap ring 205, it can touch the plug rod 229 to make the safety switch closed, so that the screw motor 223 can be normally started, ensuring that the powder compression assembly 22 can start the powder compression work.

[0098] The thickness of the powder cake has an important influence on the taste of the coffee. If necessary, the user needs to know the thickness of the powder cake, so that when the thickness of the powder cake is obviously insufficient or exceeds the bearing range of the coffee, countermeasures can be taken, such as giving up using the "too thick" powder cake, or taking out part of the coffee powder and re-making the powder cake. For the powder cake that is too thin, the △h between the ideal thickness of the powder cake and the actual thickness of the powder cake can be filled with a compensation sheet placed in the funnel assembly 3. The compensation sheet has a certain thickness and a surface uniformly distributed with a plurality of water-permeable holes. When one compensation sheet is not enough to compensate the thickness of the powder cake, multiple compensation sheets can be stacked for use.

[0099] In order to enable the coffee grinder 2 of the present embodiment to measure the thickness of the powder cake made, as shown in Figure 15 and Figure 17As shown in the drawings, in some embodiments, the powder pressing assembly 22 is provided with an optical coupler 224 fixed on the top of the piston cylinder 220, the optical coupler 224 includes a transmitting end 2240 and a receiving end 2241, the transmitting end 2240 is located directly above the receiving end 2241 and is provided with a certain distance from the receiving end 2241. The transmitting end 2240 can emit light to be received by the receiving end 2241, and the receiving end 2241 records a pulse every time it receives light.

[0100] As shown in the drawings, Figure 15 and Figure 20 The gear mechanism for driving the rotation of the screw rod 222 in the embodiment includes a screw gear 225 connected to the top of the screw rod 222, the optical coupler 224 is located on the circumference of the screw gear 225, and the transmitting end 2240 of the optical coupler 224 is located on the upper part of the screw gear 225, and the receiving end 2241 is located on the lower part of the screw gear 225. When the screw gear 225 rotates, each tooth part on it will pass through the transmitting end 2240 and the receiving end 2241 of the optical coupler 224, so that every time a tooth part passes, the light emitted by the transmitting end 2240 will be blocked once, and correspondingly the optical coupler 224 will record a pulse.

[0101] Assuming that the number of teeth of the screw gear 225 in the embodiment is z, and the pitch of the adjacent two teeth is p, when the powder pressing piston 221 is located at the starting position in the piston cylinder 220, the pulse count of the optical coupler 224 is 0, at this time the screw motor 223 is started, and every time the tooth part of the screw gear 225 passes through the transmitting end 2240 and the receiving end 2241 of the optical coupler 224, the optical coupler 224 will increase a pulse, when the powder pressing piston 221 moves downward to stop, the number of pulses recorded by the optical coupler 224 is n, if the displacement of the downward movement of the piston is s1, then s1=p*n / 46.

[0102] Further, the distance s2 that the powder pressing piston 221 moves when the pressing plate 226 thereof contacts the bottom surface in the hopper assembly 3 can be measured in advance, and then the thickness h of the powder cake is s2-s1.

[0103] In some embodiments, the powder pressing assembly 22 further includes an operation device electrically connected to the optical coupler 224, the number of pulses recorded by the optical coupler 224 can be sent to the operation device, and the operation device can calculate the moving distance of the powder pressing piston 221 and the thickness of the powder cake according to the number of pulses increased by the optical coupler 224, the pitch and the number of teeth of the screw gear 225.

[0104] The operation device in the embodiment can not only calculate the thickness size of the powder cake, but also judge the degree of the calculated thickness size, such as normal or too thick or too thin.

[0105] Meanwhile, the operation device is also electrically connected with the display screen 10 on the coffee machine 1, so as to display the thickness size and thickness degree obtained by the operation device on the display screen 10, thereby facilitating the user to view.

[0106] As shown in Figure 21 some embodiments, the support 20 of the present embodiment comprises an upper cover plate 202, a lower cover plate 204 and an intermediate plate 203 connecting the upper cover plate 202 and the lower cover plate 204, the bottom plate 200 is arranged on the lower cover plate 204, the grinding assembly 21 and the powder pressing assembly 22 are fixed on the upper cover plate 202, and the powder moving assembly 23 is arranged between the upper cover plate 202 and the lower cover plate 204.

[0107] The upper cover plate 202 is provided with a connecting column 207, a center hole of the connecting column 207 penetrating through the upper cover plate 202, and a stirring drive gear 233 is sleeved on the connecting column 207, as shown in Figure 9 The center hole of the connecting column 207 is opposite to the powder outlet 213 in the grinding assembly 21, and the coffee powder ground by the grinding assembly 21 can fall into the powder moving barrel 230 through the center hole of the connecting column 207.

[0108] The upper cover plate 202 is provided with a first through hole 206 corresponding to the powder falling hole 201 on the bottom plate 200, and the powder falling assembly can be opposite to the first through hole 206 when the powder falling assembly is installed on the support 20. The upper cover plate 202 is provided with a second through hole 208 coaxial with the first through hole 206, and the powder pressing piston 221 in the grinding assembly 21 can pass through the first through hole 206 and the second through hole 208 in sequence to compact the coffee powder in the hopper assembly 3 to form a powder cake.

[0109] The present embodiment further provides a coffee machine, as shown in Figure 22 The coffee machine 1 comprises a machine body, the machine body is provided with a display screen 10, and the machine body is provided with the above-mentioned any embodiment of the coffee bean grinder 2.

[0110] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present application, and the protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements shall also be considered to fall within the protection scope of the present application.

Claims

1. A bean grinder, characterized by The bean grinder (2) comprises: a support (20) provided with a bottom plate (200), the bottom plate (200) being provided with a powder receiving position and a powder dropping position, the powder dropping position being provided with a powder dropping opening (201); a grinding assembly (21) fixed on the support (20); a powder moving assembly (23) comprising a powder moving barrel (230) vertically arranged on the bottom plate (200), a driving mechanism (231) for moving the powder moving barrel (230) between the powder receiving position and the powder dropping position, in the powder receiving position, a top open end of the powder moving barrel (230) is opposite to a powder outlet (213) of the grinding assembly (21), and the powder moving barrel (230) and the bottom plate (200) cooperate to form a powder storage cavity in the powder moving barrel (230) to receive coffee powder ground by the grinding assembly (21), in the powder dropping position, the powder moving barrel (230) is opposite to the powder dropping opening (201) to make coffee powder in the powder storage cavity drop down; The bean grinder (2) further comprises: a stirring member (232) arranged in the powder moving barrel (230), the stirring member (232) being used to rotate in the powder moving barrel (230) to stir coffee powder in the powder storage cavity; a stirring driving gear (233) rotatably arranged on the support (20) at a position corresponding to the powder receiving position; a magnet assembly comprising a first magnet (2340) arranged on the stirring member (232) and a second magnet (2341) arranged on the stirring driving gear (233), when the powder moving barrel (230) moves to the powder receiving position, the stirring member (232) is attracted by the first magnet (2340) and the second magnet (2341) to connect with the stirring driving gear (233) and can rotate with the stirring driving gear (233); the stirring member (232) comprises a stirring seat (2320), a center of the stirring seat (2320) is provided with a first through hole, a center of the stirring driving gear (233) is provided with a second through hole, the powder outlet (213) of the grinding assembly (21) is located above the second through hole, when the powder moving barrel (230) moves to the powder receiving position, the first through hole and the second through hole are coaxial; the driving mechanism (231) comprises: a powder moving motor (2310) fixed on the support (20); a mounting fork (2311) detachably connected with a rotating shaft of the powder moving motor (2310) and the powder moving barrel (230) respectively, the powder moving motor (2310) can swing the mounting fork (2311) to move the powder moving barrel (230) relative to the bottom plate (200) to switch between the powder receiving position and the powder dropping position; one end of the mounting fork (2311) is provided with a C-shaped ring (2312), the powder moving barrel (230) can be clamped into or out of the C-shaped ring (2312) to connect or separate from the mounting fork (2311).

2. A bean grinder as claimed in claim 1, characterized in that A third magnet is arranged on the bottom of the powder moving barrel (230) and used to keep the bottom of the powder moving barrel (230) adhered to the bottom plate (200) when the powder moving barrel (230) is static or moves relative to the bottom plate (200); The grinding assembly (21) comprises a bean grinding power mechanism (210) which is in transmission connection with the stirring driving gear (233) so that the bean grinding power mechanism (210) can drive the stirring driving gear (233) to rotate when grinding coffee beans.

3. The bean grinder as claimed in claim 1, wherein The bean grinder (2) further comprises: A powder pressing assembly (22) which is arranged above the powder falling opening (201) and comprises a piston cylinder (220) fixed on the support (20) and a powder pressing piston (221) arranged in the piston cylinder (220) and movable in the vertical direction, the powder pressing piston (221) being capable of moving downward through the powder falling opening (201) to compact the coffee powder falling into the hopper assembly (3) and form a powder cake.

4. A bean grinder as claimed in claim 3, characterized in that The powder pressing assembly (22) further comprises: A transmission assembly arranged in the piston cylinder (220) and comprising a screw rod (222) arranged vertically and a screw rod sleeve (2220) sleeved on the screw rod (222), the screw rod sleeve (2220) being capable of driving the screw rod (222) to rotate and move along the axis of the screw rod sleeve (2220) when the screw rod sleeve (2220) rotates; the powder pressing piston (221) is connected with the screw rod (222) and capable of moving with the screw rod (222); A driving assembly comprising a screw rod motor (223) and a gear mechanism connecting the screw rod motor (223) and the screw rod sleeve (2220), the screw rod motor (223) driving the screw rod sleeve (2220) to rotate through the gear mechanism.

5. A bean grinder as claimed in claim 4, characterized in that The gear mechanism comprises a screw rod gear (225) connected with the screw rod sleeve (2220), and the powder pressing assembly (22) further comprises: An optical coupler (224) fixed on the piston cylinder (220) and located at the outer periphery of the screw rod gear (225), the optical coupler (224) being capable of emitting light in the vertical direction, the screw rod gear (225) being capable of blocking the light through each tooth thereof to increase the pulse number of the optical coupler (224) when the screw rod gear (225) rotates; An operation device connected with the optical coupler (224) to receive the pulse number and calculate the moving distance of the powder pressing piston (221) and the thickness of the powder cake according to the increased pulse number, the pitch of the screw rod gear (225) and the number of teeth of the screw rod gear (225); Wherein: s = p*n / z; s represents the moving distance of the powder pressing piston; p represents the pitch of the screw rod gear; z represents the number of teeth of the screw rod gear; and n represents the increased pulse number of the optical coupler.

6. A bean grinder as claimed in claim 4, characterized in that The powder pressing assembly (22) further comprises a safety switch electrically connected with the screw motor (223), the closing and opening of the safety switch is used to control the closing and opening of the screw motor (223), a mounting clasp (205) is arranged on the support (20) below the powder falling port (201), the mounting clasp (205) is used to connect a hopper assembly (3), a plug rod (229) electrically connected with the safety switch is arranged on the mounting clasp (205), when the hopper assembly (3) is placed on the mounting clasp (205), the plug rod (229) can be touched to make the safety switch closed.

7. A coffee maker, characterized in that The coffee machine comprises a grinder (2) according to any one of the preceding claims 1-6.

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