Coaxial bean grinding and powder falling device and bean grinding coffee machine

Abstract

The utility model discloses a coaxial bean grinding and powder falling device and a bean grinding coffee machine, belongs to coffee beverage brewing equipment, and aims to solve the problems that the front-back size of a product is large and the structure is complex due to the fact that a powder falling opening of an existing bean grinding coffee machine deviates from the center of a bean grinding device in a front-back mode. A powder falling channel downwards and vertically extends from a powder falling opening and penetrates through a watering device, a baffle is transversely arranged in a path of the powder falling channel and is configured to change positions between a first position and a second position, the powder falling channel is opened when the baffle is located at the first position, and the powder falling channel is blocked when the baffle is located at the second position. And the inner grinding wheel, the powder falling opening and the powder falling channel are coaxially arranged, so that the front-back size of a product can be reduced, and the product size is reduced. Moreover, ground coffee powder can directly and quickly fall into the powder falling channel through the powder falling opening, a rotating component for gathering the ground coffee powder towards the powder falling opening is not needed, the structure in the grinding cavity is simplified, and the vertical size of the bean grinding device is reduced.

Description

Technical Field

[0001] The utility model belongs to coffee beverage brewing equipment, in particular to a coaxial bean grinding and powder dropping device and a bean grinding coffee machine. Background Art

[0002] The patent document with the authorization announcement number CN216569558U discloses a technical solution named a powder dropping and water sprinkling mechanism and a coffee bean grinding machine. The technical solution configures an inner cavity between the first wall and the second wall on the baffle assembly, and sets a water inlet connected to the inner cavity on the first wall, and sets a water sprinkling port connected to the inner cavity on the second wall, and configures a water pipe for the water inlet. When the baffle assembly is in the first position, the powder dropping port is opened to allow coffee powder to fall from the powder dropping port; when the baffle assembly is in the second position, the powder dropping port is blocked to prevent coffee powder from falling from the powder dropping port, and the water flowing out of the water sprinkling port can face the pile of coffee powder.

[0003] The above technical solution has the following defects:

[0004] 1. The powder outlet is offset from the center of the grinding device, which results in a large front and rear dimension of the product, making it difficult to drop the powder. In addition, a rotating component is required to gather the ground coffee powder to the powder outlet, resulting in a complex structure.

[0005] 2. The water pipe is connected by moving and changing the position of the baffle assembly, and the connection part with the water pipe is prone to water leakage;

[0006] 3. The powder-falling and water-sprinkling mechanism has a complex overall structure and large vertical dimensions;

[0007] 4. The baffle assembly has a complex structure, the motor driving the baffle assembly has a large load, and the rotation and transposition of the baffle assembly causes the parts that cooperate with the seal to be damaged to different degrees, and the parts will quickly fatigue and fail;

[0008] 5. The motors that drive the baffle assembly are mostly stepper motors, which will rotate in the opposite direction when subjected to greater resistance, causing work errors. Utility Model Content

[0009] The technical problem to be solved and the technical task proposed by the utility model are to overcome the defects of the existing bean grinding coffee machine, such as the large front and rear dimensions of the product and the complex structure, caused by the front and rear offset of the powder dropping port and the center of the bean grinding device, and to provide a coaxial bean grinding and powder dropping device and a bean grinding coffee machine, so as to reduce the size of the bean grinding coffee machine, simplify the product structure, and extend the product life, and on this basis further overcome the remaining defects mentioned above.

[0010] In order to achieve the above-mentioned purpose, the coaxial bean grinding and powder dropping device of the utility model comprises:

[0011] The bean grinding device comprises an inner grinding wheel and an outer grinding wheel located in a grinding chamber, and a powder outlet is provided at the bottom center of the grinding chamber;

[0012] A watering device, which is located below the bean grinding device and is equipped with watering holes;

[0013] A powder dropping channel vertically extends downward from the powder dropping port and penetrates the watering device;

[0014] a baffle, which is arranged transversely in the path of the powder falling channel and is configured to switch between a first position and a second position, the powder falling channel is opened when the baffle is in the first position, and the powder falling channel is blocked when the baffle is in the second position;

[0015] Among them, the inner grinding wheel, the powder dropping port and the powder dropping channel are coaxially arranged.

[0016] This technical solution can reduce the front and rear dimensions of the product and the volume of the product by coaxially arranging the inner grinding wheel, the powder drop port and the powder drop channel. Moreover, the ground coffee powder can directly and quickly fall into the powder drop channel through the powder drop port, without the need to configure a rotating member to gather the ground coffee powder to the powder drop port, thus simplifying the structure in the grinding chamber and reducing the vertical size of the bean grinding device.

[0017] This technical solution replaces the baffle assembly with a baffle, has a simple structure and is easy to drive.

[0018] In this technical solution, no water delivery structure is provided on the baffle, thereby avoiding water leakage caused by frequent connection and disconnection of the water delivery pipe.

[0019] Preferably, the lower end of the powder drop port is butted against the upper end of the powder drop channel and the caliber of the lower end of the powder drop port is smaller than the caliber of the upper end of the powder drop channel, so as to prevent the falling coffee powder from accumulating there.

[0020] Preferably, the powder drop opening is in a trumpet shape and its diameter gradually decreases from top to bottom, thereby guiding the coffee powder in the grinding chamber to fall quickly.

[0021] Preferably, a bottom cover is arranged at the lower side of the powder dropping port, a driving gear is arranged between the bottom cover and the powder dropping port, the driving gear extends upward through the powder dropping port and is connected to the inner grinding wheel, a first powder dropping hole located in the powder dropping channel is arranged on the driving gear, and a second powder dropping hole located in the powder dropping channel is arranged on the bottom cover. This structure uses the driving gear and the bottom cover to configure the powder dropping channel, and has a simpler structure compared with the prior art in which an independent powder dropping channel is arranged on one side.

[0022] Preferably, the driving gear is provided with spokes, the first powder falling hole is located between adjacent spokes, and the spokes are configured to blow air downward when the driving gear rotates, which is beneficial for the coffee powder to fall and prevents the coffee powder from adhering to the inner wall of the powder falling channel.

[0023] Preferably, one side surface of the spoke is set as an inclined surface, so as to take into account both the structural strength and the blowing function of the driving gear.

[0024] Preferably, a bracket is provided in the second powder falling hole, and the driving gear is assembled on the bracket via a shaft, thereby providing reliable support for the driving gear and enabling the driving gear to rotate flexibly.

[0025] Preferably, the gear is supported and rotated by the bottom cover and / or the bottom wall of the grinding chamber to ensure that the driving gear can transmit a sufficiently large torque to grind the coffee beans.

[0026] Preferably, a first sealing ring is provided between the upper end surface of the driving gear and the bottom wall of the grinding chamber, and a second sealing ring is provided between the lower end surface of the driving gear and the bottom cover, so as to avoid leakage of coffee powder caused by the rotation of the driving gear.

[0027] Preferably, the bottom cover is equipped with a static electricity removal device, which has a tip portion, and the tip portion is located in the second powder dropping hole, so as to eliminate static electricity carried by coffee powder and prevent the coffee powder from adhering to the inner wall of the powder dropping channel due to static electricity.

[0028] Preferably, the sprinkler has a third powder dropping hole located in the powder dropping channel, and the baffle is located between the second powder dropping hole and the third powder dropping hole, so as to isolate the water vapor generated by the sprinkler from floating upward along the powder dropping channel when the sprinkler sprinkles water, and keep the powder dropping channel as dry as possible.

[0029] Preferably, the baffle blocks the powder falling channel by at least one of the following methods:

[0030] (1) A third sealing ring in contact with the upper surface of the baffle is provided at the lower end of the second powder dropping hole;

[0031] (2) The upper end of the third powder dropping hole is provided with a fourth sealing ring in contact with the lower surface of the baffle.

[0032] Accordingly, water vapor can be blocked from escaping from the baffle, ensuring a dry environment inside the equipment.

[0033] Preferably, the second powder dropping hole is connected to the third powder dropping hole and the diameter of the lower end of the second powder dropping hole is smaller than the diameter of the upper end of the third powder dropping hole, thereby preventing coffee powder from accumulating there.

[0034] Preferably, the inner wall of the third powder dropping hole is provided with water spray holes, through which water is sprayed toward the inner wall of the third powder dropping hole to rinse the inner wall of the third powder dropping hole, thereby preventing coffee powder from adhering to the inner wall of the third powder dropping hole.

[0035] Preferably, the water spray hole faces obliquely upward. When water is sprayed through the water spray hole, the lower surface of the baffle can be washed to keep the lower surface of the baffle clean, which is conducive to the movement and transposition of the baffle.

[0036] Preferably, the sprinkler device has a flat water collection chamber, which is connected to the water inlet interface, and the bottom of the flat water collection chamber is provided with sprinkler holes. Therefore, hot water from the water inlet interface can be uniformly discharged from the sprinkler holes after being collected in the water collection chamber. Moreover, the water collection chamber is flat and occupies a small height. The sprinkler device does not change position during operation, and the water channel has good sealing performance and is not easy to leak.

[0037] Preferably, the baffle is arranged on the track and guided to move by the track. Accordingly, the movement of the baffle is constrained by the track and the transposition is accurate.

[0038] Preferably, one end of the baffle is connected to the transposition motor via a cam, and the cam is provided with a first position switch and a second position switch. When the baffle is in the first position, the cam triggers the first position switch, and when the baffle is in the second position, the cam triggers the second position switch. Accordingly, the transposition motor moves the baffle with the cam, and is controlled by the first position switch and the second position switch to accurately stop the baffle at the first position or the second position. Moreover, the cam can move the baffle with the continuous rotation of the motor, without the need to use a stepper motor, which can save the cost of the transposition motor.

[0039] Preferably, a through hole is provided on the baffle, and when the baffle is in the first position, the through hole corresponds to the powder falling channel, and when the baffle is in the second position, the through hole is staggered from the powder falling channel. Accordingly, when the baffle changes position between the first position and the second position, it will not completely leave the powder falling channel, which is conducive to maintaining the seal with the powder falling channel.

[0040] The coaxial bean grinding and powder dropping device of the utility model is applied to a bean grinding coffee machine, which includes a coffee basket, wherein the lower port of the powder dropping channel and the watering hole of the watering device correspond to the center of the coffee basket. Accordingly, the function and effect of the coaxial bean grinding and powder dropping device of the utility model are achieved.

[0041] The utility model sets a powder drop opening at the bottom center of the grinding chamber, extends the powder drop channel vertically downward from the powder drop opening and penetrates the watering device, arranges the baffle plate horizontally in the path of the powder drop channel and is configured to switch between the first position and the second position, opens the powder drop channel when the baffle plate is in the first position, blocks the powder drop channel when the baffle plate is in the second position, and arranges the inner grinding wheel, the powder drop opening and the powder drop channel coaxially, thereby reducing the front and rear dimensions of the product and reducing the product volume. Moreover, the ground coffee powder can directly and quickly fall into the powder drop channel through the powder drop opening, without the need to configure a rotating component to gather the ground coffee powder to the powder drop opening, thereby simplifying the structure in the grinding chamber and reducing the vertical dimensions of the bean grinding device.

[0042] The utility model replaces the baffle assembly with a baffle, has a simple structure and is easy to drive.

[0043] The baffle of the utility model does not have a water delivery structure, thereby preventing water leakage caused by frequent connection and disconnection of the water delivery pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A perspective view of a coffee bean grinding machine using the coaxial bean grinding and powder dropping device of the utility model;

[0045] Figure 2 for Figure 1 A schematic diagram of another perspective of the coffee bean grinding machine with part of the casing removed;

[0046] Figure 3 This is a schematic diagram of the positional relationship between the coaxial bean grinding and powder dropping device and the coffee basket of the utility model;

[0047] Figure 4 for Figure 3 a schematic orthographic projection of one view of the structure shown;

[0048] Figure 5 for Figure 4 AA section view;

[0049] Figure 6 for Figure 5 BB section view;

[0050] Figure 7 for Figure 5 An enlarged view of the coaxial bean grinding and powder dropping device;

[0051] Figure 8 for Figure 6 An enlarged view of the coaxial bean grinding and powder dropping device;

[0052] Fig. 9 It is a perspective view of the coaxial bean grinding and powder dropping device of the utility model from one viewing angle;

[0053] Fig.10 It is a perspective view of the coaxial bean grinding and powder dropping device of the utility model from another angle of view;

[0054] Fig.11 It is a schematic diagram of the axial orthographic projection of the driving gear of the utility model in the upward direction;

[0055] Fig.12 for Fig.11 CC section view;

[0056] Fig.13 This is a schematic diagram of the structure of the bean grinding device, driving gear and bottom cover of the utility model from one perspective;

[0057] Fig.14 for Fig.13 a schematic diagram of another view of the structure shown;

[0058] Fig.15It is a structural exploded schematic diagram of the baffle and the sprinkler device of the utility model from one perspective;

[0059] Fig.16 for Fig.15 a schematic diagram of another view of the structure shown;

[0060] Description of the numbers in the figure:

[0061] 100 housing;

[0062] 200 coaxial bean grinding and powder dropping device

[0063] 210 bean grinding device, 211 grinding chamber, 212 inner grinding wheel, 213 outer grinding wheel, 214 powder drop port, 215 grinding motor, 216 blind hole,

[0064] 220 driving gear, 221 first powder dropping hole, 222 spoke, 223 inclined surface, 224 shaft, 225 first sealing ring, 226 second sealing ring, 227 arm,

[0065] 230 bottom cover, 231 second powder dropping hole, 232 bracket, 233 static elimination device, 234 tip portion, 235 third sealing ring;

[0066] 240 baffle, 241 cam, 242 shifting motor, 243 first position switch, 244 second position switch, 245 through hole, 246 folding edge, 247 movable hole

[0067] 250 watering device, 251 watering hole; 252 third powder dropping hole, 253 fourth sealing ring, 254 water spray hole, 255 flat water collecting chamber, 256 water inlet interface, 257 track, 258 upper cover, 259 lower cover;

[0068] 260 powder falling channel;

[0069] 300 coffee baskets;

[0070] 400 coffee pot

[0071] 500 bean box. DETAILED DESCRIPTION

[0072] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0073] The terms "including" and "having" and any variations thereof in the specification and claims of the present utility model are intended to cover non-exclusive inclusions. For example, a method or product comprising a series of technical features is not necessarily limited to those technical features clearly listed, but may also include other technical features that are not clearly listed and can be included in the method or product.

[0074] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. Among them, "upper" is opposite to "lower", and "front" is opposite to "back".

[0075] In the description of the present utility model, it is necessary to understand that the technical features defined by the terms "first", "second" and the like with sequential concepts are only for the purpose of clearly describing the defined technical features so that the defined technical features can be clearly distinguished from other technical features, but do not represent such naming in actual implementation, and therefore cannot be understood as a limitation of the present utility model.

[0076] The present invention is described in detail below in conjunction with specific embodiments and drawings.

[0077] like Figure 1-6 As shown, the bean grinding coffee machine includes a bean box 500, a housing 100, a water tank located inside the housing, a heating device, a water sprinkler 250, a bean grinding device 210, a driving gear 220, a bottom cover 230, a baffle 240, and a coffee basket 300. The bean box 500 is used to store coffee beans and is installed on the top of the housing 100. During operation, the coffee beans in the bean box 500 fall into the bean grinding device 210, and the bean grinding device 210 grinds the coffee beans into coffee powder, which falls into the coffee basket 300 through the powder falling channel 260. This process is called the bean grinding process. The water stored in the water tank is transported to the water sprinkler by a water pump, and flows through the heating device to be heated to become hot water. The hot water flows from the water sprinkler 250 into the coffee basket 300, brewing the coffee powder in the coffee basket into a coffee beverage, and the coffee beverage flows into the coffee pot 400. This process is called the brewing process. The bean grinding process and the brewing process are performed sequentially rather than simultaneously. During the grinding process, the powder falling channel 260 is opened by the baffle 240, and the water pump does not supply water to the sprinkler. During the brewing process, the bean grinding device 210 stops working, and the baffle 240 closes the powder falling channel 260 to prevent water vapor from escaping to the powder falling channel and the grinding chamber.

[0078] Figure 1-2In the coffee bean grinding machine of the structure shown, the bean grinding device 210, the driving gear 220, the bottom cover 230, the baffle 240, and the watering device 250 constitute a coaxial bean grinding and powder dropping device.

[0079] like Figure 7-10 , Figure 13-14 As shown, the bean grinding device 210 includes an inner grinding wheel 212 and an outer grinding wheel 213 located in a grinding chamber 211. The inner grinding wheel 212 is driven by a grinding motor 215 through a transmission mechanism, and the transmission mechanism adopts a worm gear and gear transmission. And the grinding motor 215 is fixed to the bottom cover 230 described below. The transmission mechanism includes a driving gear 220, and the driving gear 220 has an eccentric arm 227 extending upward, and the lower end of the inner grinding wheel has an eccentric blind hole 216. The arm is inserted into the blind hole to realize the connection between the driving gear 220 and the inner grinding wheel 212 to rotate with the inner grinding wheel. The outer grinding wheel 213 is sleeved on the outer periphery of the inner grinding wheel 212. When the inner grinding wheel 212 rotates, it rotates relative to the outer grinding wheel 213 to grind the coffee beans entering between the two into coffee powder. In order to adjust the particle size of the coffee powder, the outer grinding wheel is usually set to be adjustable, that is, the gap between the inner grinding wheel and the outer grinding wheel is adjusted by adjusting the position of the outer grinding wheel. In the illustrated structure, the cross-sectional profile of the grinding chamber 211 is a circle, and a powder drop opening 214 is provided at the bottom center of the grinding chamber 211. The powder drop opening 214 is in a trumpet shape and its diameter gradually decreases from top to bottom.

[0080] like Figure 7-8 , Figure 13-14 As shown, a bottom cover 230 is disposed at the lower side of the powder dropping port 214, and a driving gear 220 is assembled between the bottom cover 230 and the powder dropping port 214. The arm 227 of the driving gear 220 extends upward through the powder dropping port 214 and is connected to the inner grinding wheel 212. A first powder dropping hole 221 located in the powder dropping channel 260 is distributed on the driving gear 220, and a second powder dropping hole 231 located in the powder dropping channel 260 is distributed on the bottom cover 230. The first powder dropping hole 221 and the second powder dropping hole 231 constitute the components of the powder dropping channel. Spokes 222 are provided on the driving gear 220, and the first powder dropping hole 221 is located between adjacent spokes. As shown in FIG. Figure 11-12 As shown, one side of the spoke 222 is set as an inclined surface 223, and when the driving gear 220 rotates, the inclined surface blows air downward like the blades of a fan. Figure 7-8As shown, a first sealing ring 225 is provided between the upper end surface of the driving gear 220 and the bottom wall of the grinding chamber, and a second sealing ring 226 is provided between the lower end surface of the driving gear and the bottom cover. In addition, the upper port of the first powder dropping hole 221 constitutes the upper port of the powder dropping channel 260, and the lower port of the powder dropping hole 214 is connected to the upper port of the powder dropping channel, and the caliber of the lower port of the powder dropping hole is smaller than the caliber of the upper port of the powder dropping channel, so as to avoid the accumulation of coffee powder here. Similarly, the lower port of the first powder dropping hole 221 is connected to the upper port of the second powder dropping hole 231, and the caliber of the lower port of the first powder dropping hole is smaller than the caliber of the upper port of the second powder dropping hole, so as to avoid the accumulation of coffee powder here. A bracket 232 is provided in the second powder dropping hole 231, and the driving gear 220 is assembled to the bracket 232 via the shaft 224. The driving gear is supported and rotated by the bottom cover and / or the bottom wall of the grinding chamber through the annular flange with the end surface removed. As shown Figure 13-14 As shown, the bottom cover 230 is equipped with a static eliminator 233, which has a tip 234, and the tip 234 is located in the second powder falling hole 231. When the ground coffee powder falls through it, the tip discharges to neutralize the charge carried by the coffee powder, thereby preventing the coffee powder from being charged and adhering to the inner wall of the second powder falling hole. The lower end of the second powder falling hole 231 is provided with a third sealing ring 235 in contact with the upper surface of the baffle 240, and the third sealing ring defines the caliber of the lower end of the second powder falling hole.

[0081] like Figure 7-8 , Fig.10 , Figure 15-16 As shown, the watering device 250 is located below the bean grinding device 210 and is provided with watering holes 251. Specifically, the watering device 250 is located at the lower side of the bottom cover 230. The watering device 250 has a flat water collecting chamber 255, which is formed between the upper cover 258 and the lower cover 259. The upper cover 258 is provided with a water inlet interface 256 connected to the water collecting chamber, and the water inlet interface 256 is connected to a pipeline not shown in the figure to transport water to the flat water collecting chamber. The lower cover 259 serves as the bottom of the flat water collecting chamber and is provided with watering holes 251. The watering device 250 has a third powder dropping hole 252 located in the powder dropping channel, and the third powder dropping hole 252 is located in the middle of the upper cover 258 and the lower cover 259 and is isolated from the flat water collecting chamber by a fourth sealing ring 253. Similarly, the lower end of the second powder dropping hole 231 is connected to the upper end of the third powder dropping hole 252, and the caliber of the lower end of the second powder dropping hole is smaller than the caliber of the upper end of the third powder dropping hole, so as to avoid the accumulation of coffee powder here. The upper end of the third powder dropping hole 252 is provided with a fourth sealing ring 253 in contact with the lower surface of the baffle 240, and the fourth sealing ring 253 limits the caliber of the upper end of the third powder dropping hole.

[0082] like Figure 7-8 , Figure 15-16As shown, the inner wall of the third powder dropping hole 252 is provided with water spray holes 254. The water spray holes 254 face obliquely upward. The water spray holes 254 are connected to the flat water collecting chamber 255, and the water spray holes spray water while the water sprinkler sprinkles water.

[0083] As described above, the powder dropping channel 260 includes the first powder dropping hole 221, the second powder dropping hole 231 and the third powder dropping hole 252, which vertically extends downward from the powder dropping opening 214 and penetrates the water sprinkling device. In addition, the inner grinding wheel 212, the powder dropping opening 214 and the powder dropping channel 260 are coaxially arranged.

[0084] like Figure 7 , Figure 15-16 As shown, the baffle 240 is a thin plate. The baffle 240 is located between the second powder dropping hole 231 and the third powder dropping hole 252 and is arranged transversely in the path of the powder dropping channel 260. Driven by the transposition motor 242, the baffle 240 is transposed between the first position and the second position. When the baffle is in the first position, the powder dropping channel is opened, and when the baffle is in the second position, the powder dropping channel is blocked.

[0085] like Figure 7 As shown, when the baffle 240 blocks the powder falling channel, the upper surface of the baffle 240 contacts the third sealing ring 235, and the lower surface of the baffle contacts the fourth sealing ring 253 to achieve sealing.

[0086] like Figure 15-16 As shown, the baffle 240 is arranged on a track 257 and is guided by the track to move. The track is two parallel ribs arranged on the upper surface of the upper cover. Correspondingly, the baffle has two corresponding folded edges 246, which straddle the ribs and are guided by the ribs when the baffle moves.

[0087] like Figure 15-16 As shown, one end of the baffle 240 is connected to the transposition motor 242 via the cam 241. Specifically, a movable hole 247 is provided at one end of the baffle 240, and the cam 241 is assembled on the output shaft of the transposition motor, and the eccentric shaft of the cam is inserted in the movable hole. When the transposition motor rotates with the cam, the eccentric shaft moves in the movable hole and pushes and pulls the baffle to cause the baffle to move. The cam is configured with a first position switch 243 and a second position switch 244. When the baffle is in the first position, the cam triggers the first position switch, and when the baffle is in the second position, the cam triggers the second position switch. In other embodiments, a connecting rod can be connected between the baffle and the eccentric shaft of the cam. When the cam rotates, the eccentric shaft pushes and pulls the baffle through the connecting rod to cause the baffle to move. A through hole 245 is provided on the baffle 240. When the baffle is in the first position, the through hole corresponds to the powder dropping channel, and when the baffle is in the second position, the through hole is staggered from the powder dropping channel.

[0088] The aforementioned coaxial bean grinding and powder dropping device integrates the powder dropping function, static electricity elimination function and steam isolation function (closing the powder dropping channel) to ensure their coordination and compatibility, which is especially convenient for proofing and testing during product structural design.

[0089] like Figure 1-6 In the coffee machine shown, in addition to the coaxial arrangement of the inner grinding wheel 212, the powder dropping port 214 and the powder dropping channel 260, the lower end of the powder dropping channel 260 and the watering hole 251 of the watering device 250 correspond to the center of the coffee basket 300. Therefore, in addition to having the effects and functions of the coaxial bean grinding and powder dropping device of the utility model, the coffee powder can be concentrated and accumulated in the center of the coffee basket, and the hot water output by the watering device can also fully brew the coffee powder in the coffee basket.

Claims

1. Coaxial bean grinding and powder dropping device, characterized by include: A bean grinding device (210), comprising an inner grinding wheel (212) and an outer grinding wheel (213) located in a grinding chamber (211), wherein a powder outlet (214) is provided at the bottom center of the grinding chamber; A watering device (250), which is located below the bean grinding device and is provided with a watering hole (251); A powder dropping channel (260) vertically extends downward from the powder dropping opening and penetrates the watering device (250); a baffle (240) arranged transversely in the path of the powder falling channel (260) and configured to switch between a first position and a second position, the powder falling channel being opened when the baffle is in the first position and the powder falling channel being blocked when the baffle is in the second position; The inner grinding wheel (212), the powder dropping opening (214) and the powder dropping channel (260) are coaxially arranged.

2. The coaxial bean grinding and powder dropping device according to claim 1 is characterized in that: The lower port of the powder dropping port (214) is butted against the upper port of the powder dropping channel (260), and the caliber of the lower port of the powder dropping port is smaller than the caliber of the upper port of the powder dropping channel.

3. The coaxial bean grinding and powder dropping device according to claim 1 or 2, characterized in that: The powder drop opening (214) is in a trumpet shape and its diameter gradually decreases from top to bottom.

4. The coaxial bean grinding and powder dropping device according to claim 1 is characterized in that: A bottom cover (230) is arranged at the lower side of the powder dropping port (214), a driving gear (220) is arranged between the bottom cover (230) and the powder dropping port, the driving gear (220) is connected to the inner grinding wheel (212), a first powder dropping hole (221) located in the powder dropping channel is arranged on the driving gear (220), and a second powder dropping hole (231) located in the powder dropping channel is arranged on the bottom cover (230).

5. The coaxial bean grinding and powder dropping device according to claim 4 is characterized in that: The driving gear (220) is provided with spokes (222), and the first powder dropping holes (221) are located between adjacent spokes. The spokes are configured to blow air downward when the driving gear rotates.

6. The coaxial bean grinding and powder dropping device according to claim 5 is characterized in that: One side surface of the spoke (222) is configured as an inclined surface (223).

7. The coaxial bean grinding and powder dropping device according to claim 4 is characterized in that: A bracket (232) is provided in the second powder dropping hole (231), and the driving gear (220) is assembled on the bracket via the shaft (224).

8. The coaxial bean grinding and powder dropping device according to claim 4 or 7, characterized in that: The gear (220) is supported and rotated by the bottom cover and / or the bottom wall of the grinding chamber.

9. The coaxial bean grinding and powder dropping device according to claim 4 is characterized in that: A first sealing ring (225) is provided between the upper end surface of the driving gear (220) and the bottom wall of the grinding chamber, and a second sealing ring (226) is provided between the lower end surface of the driving gear and the bottom cover (230).

10. The coaxial bean grinding and powder dropping device according to claim 4 is characterized in that: The bottom cover (230) is equipped with a static electricity removal device (233), which has a tip portion (234), and the tip portion (234) is located in the second powder dropping hole (231).

11. The coaxial bean grinding and powder dropping device according to claim 4 is characterized in that: The watering device (250) has a third powder dropping hole (252) located in the powder dropping channel (260), and the baffle (240) is located between the second powder dropping hole (231) and the third powder dropping hole (252).

12. The coaxial bean grinding and powder dropping device according to claim 11, characterized in that: When the baffle (240) blocks the powder falling channel (260), sealing is achieved by at least one of the following methods: (1) A third sealing ring (235) in contact with the upper surface of the baffle is provided at the lower end of the second powder dropping hole (231); (2) The upper end of the third powder dropping hole (252) is provided with a fourth sealing ring (253) in contact with the lower surface of the baffle.

13. The coaxial bean grinding and powder dropping device according to claim 11, characterized in that: The second powder dropping hole (231) is connected to the third powder dropping hole (252), and the caliber of the lower end of the second powder dropping hole is smaller than the caliber of the upper end of the third powder dropping hole.

14. The coaxial bean grinding and powder dropping device according to claim 11, characterized in that: The inner wall of the third powder dropping hole (252) is provided with water spray holes (254).

15. The coaxial bean grinding and powder dropping device according to claim 14, characterized in that: The water spray hole (254) faces obliquely upward.

16. The coaxial bean grinding and powder dropping device according to any one of claims 1-2, 4-7, 9-15, characterized in that: The watering device (250) comprises a flat water collecting chamber (255), the flat water collecting chamber is connected to a water inlet interface (256), and watering holes (251) are distributed at the bottom of the flat water collecting chamber.

17. The coaxial bean grinding and powder dropping device according to any one of claims 1-2, 4-7, 9-15, characterized in that: The baffle (240) is arranged on the track (257) and moves guided by the track.

18. The coaxial bean grinding and powder dropping device according to claim 17, characterized in that: One end of the baffle (240) is connected to a transposition motor (242) via a cam (241), and the cam is provided with a first position switch (243) and a second position switch (244). When the baffle is in the first position, the cam triggers the first position switch, and when the baffle is in the second position, the cam triggers the second position switch.

19. The coaxial bean grinding and powder dropping device according to claim 17, characterized in that: A through hole (245) is provided on the baffle plate (240); when the baffle plate is located at a first position, the through hole (245) corresponds to the powder dropping channel (260); when the baffle plate is located at a second position, the through hole (245) is staggered from the powder dropping channel (260).

20. A coffee bean grinding machine, characterized by include: The coaxial bean grinding and powder dropping device (200) according to any one of claims 1 to 19; Coffee basket (300); Wherein, the lower port of the powder dropping channel (260) and the watering hole (251) of the watering device both correspond to the center of the coffee basket (300).

Images