Coffee bean grinding structure, grinding machine and coffee machine

Abstract

The utility model discloses a coffee bean grinding structure, a grinding machine and a coffee machine. The coffee bean grinding structure comprises a shell, a grinding cavity is formed in the shell, a vertical driving shaft is arranged in the grinding cavity, and a driving device is arranged outside the grinding cavity and is in driving connection with the driving shaft. The bottom of the grinding cavity is provided with a discharge hole, and a powder sweeper and a tool bit which are in direct or indirect driving connection with the driving shaft; the metal grinding head assembly comprises the tool bit, a grinding disc arranged around the periphery of the tool bit and a positioning sleeve arranged around the periphery of the grinding disc, and a conductive terminal is arranged on the positioning sleeve; a shell forming the grinding cavity is made of plastic, and the positioning sleeve and the inner wall of the grinding cavity are installed, fixed and sealed through interference fit; the grinding disc adjusting assembly is made of plastic; the overall cost is reduced by arranging the positioning sleeve, meanwhile, the high precision of ground powder is guaranteed, and the effect of preventing static powder sticking and powder flying can be achieved.

Description

Technical Field

[0001] The utility model belongs to the field of grinding equipment, and in particular relates to a coffee bean grinding structure, a grinder and a coffee machine. Background Art

[0002] Coffee bean grinding is a crucial part of the coffee preparation process. The particle size and uniformity of the ground coffee powder directly affect the taste and flavor of the final coffee. Modern coffee bean grinders use different designs to achieve different grinding effects. Common ones are blade-type and conical disc-type coffee bean grinders, which produce coffee powder of different particle sizes through different mechanical structures and angles. High-end coffee bean grinders are usually equipped with precise particle size control devices, allowing users to adjust the coarseness of the grinding according to different coffee preparation methods (for example, immersion, drip, espresso, etc.) to meet different taste requirements. The coffee bean grinding structures on the market, including gear boxes, knife discs, and adjustment discs, are all made of metal or plastic. The advantages of metal are high precision, uniform powder output and no collision with the knife, but the disadvantage is high cost; while the precision of plastic materials is not enough, and the uniformity of the powder output cannot be guaranteed, but the cost is low and the price is cheap. At the same time, coffee beans will generate a lot of static electricity when they are ground due to drying and other reasons. The fine powder ground with static electricity will fly everywhere or adhere to the powder outlet channel, resulting in blockage of powder. Due to the natural insulation properties of plastic, static electricity cannot be discharged through grounding.

[0003] Chinese patent publication number CN102743105A discloses a coffee bean grinding machine with an anti-blocking function, which specifically uses a micro vibrator to solve the problem of channel blockage, but does not solve the problem of high cost and the problem of maintaining accuracy to improve the uniformity of powder output.

[0004] Therefore, in view of the problems existing in the prior art, it is urgently necessary to provide a coffee bean grinding structure, a grinder and a coffee machine to solve the problems existing in the prior art. Summary of the invention

[0005] In view of the problems in the related technology, the utility model proposes a coffee bean grinding structure, which reduces the overall cost by providing a positioning sleeve, while ensuring the high precision of the ground powder, and can also achieve the effect of preventing static powder sticking and flying.

[0006] The utility model is achieved in this way:

[0007] A coffee bean grinding structure comprises a shell, a grinding chamber is provided on the shell, a vertical driving shaft is provided in the grinding chamber, and a driving device is provided outside the grinding chamber and is drivingly connected to the driving shaft; a discharge port is provided at the bottom of the grinding chamber, and a powder sweeper and a cutter head are directly or indirectly drivingly connected to the driving shaft;

[0008] It also includes a metal grinding head assembly, which includes the cutter head, a grinding disc arranged around the outer periphery of the cutter head, and a positioning sleeve arranged around the outer periphery of the grinding disc, wherein a conductive terminal is provided on the positioning sleeve.

[0009] Specifically, an opening is provided at the bottom of the grinding chamber, the driving shaft passes through the opening, and both ends of the driving shaft are respectively connected to the driving device and the cutter head, and the powder sweeper is located in the chamber on the side where the cutter head is located.

[0010] Preferably, the shell forming the grinding chamber is made of plastic, and the positioning sleeve is installed, fixed and sealed with the inner wall of the grinding chamber through interference fit.

[0011] Specifically, the conductive terminal may be formed by connecting the ground wire and the positioning sleeve through rivets.

[0012] Preferably, it also includes a plastic grinding disc adjustment assembly, which includes an adjusting outer ring and an adjusting inner ring, a mutually matching threaded structure between the inner and outer rings, an axially matching guide piece and a guide groove between the adjusting inner ring and the outer wall of the shell, and the grinding disc is relatively fixed to the adjusting inner ring.

[0013] Specifically, the grinding disc adjustment assembly is easy to disassemble and clean, while having the same precision as metal components and at a lower cost.

[0014] Preferably, the edge of the positioning sleeve is folded outwards and sleeved on the inner wall of the grinding chamber;

[0015] The upper end of the grinding disc protrudes outward with an annular edge, a grinding disc bracket is provided at the annular edge of the grinding disc, the inner wall of the grinding disc bracket protrudes inward with an annular edge and a plurality of fasteners, the fasteners are located at the lower end of the annular edge, and the annular edge of the grinding disc is fastened between the annular edge and the fasteners through the fasteners;

[0016] There are mutually matching limiting grooves and limiting members between the outer wall of the grinding disc support and the inner wall of the adjusting inner ring, the inner side wall of the adjusting inner ring protrudes inward to form an annular receiving portion, the limiting member is located at the upper end of the receiving portion, and the receiving portion is located between the grinding disc support and the folded portion of the edge of the positioning sleeve;

[0017] The grinding disc is relatively fixed to the adjusting inner ring through a grinding disc bracket.

[0018] Specifically, a first recessed portion corresponding to the guide groove is provided at the folded portion of the edge of the positioning sleeve, and the guide member extends into the guide groove through the first recessed portion on the periphery of the positioning sleeve;

[0019] The rotation of the adjusting inner ring can be avoided by the cooperation of the guide member and the guide groove. Therefore, when the adjusting outer ring drives the adjusting inner ring to rotate, the adjusting inner ring cannot rotate but can only move up and down along the guide groove. The grinding disc is lifted directly or indirectly through the supporting part to move the grinding disc upward, thereby changing the distance between the grinding disc and the cutter head, so as to adjust the uniformity of the coarseness of the output powder.

[0020] The grinding disc support can improve the stability of the grinding disc, and at the same time improve the uniformity of the powder produced during grinding;

[0021] The grinding disc bracket stabilizes the grinding disc through the ring edge and the fasteners, and at the same time the outer wall is engaged with the adjusting inner ring through the limiting groove and the limiting piece, so that the adjusting inner ring, the grinding disc bracket and the grinding disc move simultaneously.

[0022] Preferably, the cutter head is a frustum structure that gradually becomes larger from top to bottom; the surface of the grinding disc that meets the cutter head is a curved structure that is narrow in the middle and wide at the top and bottom, and the narrow-to-wide part of the lower end of the grinding disc is adapted to the lower part of the cutter head.

[0023] Specifically, the coffee beans are placed between the blade head and the grinding disc for grinding. Since the positioning sleeve is fixed around and sleeved on the circumference of the grinding disc, the grinding stability can be improved. At the same time, the precision of metal is higher than that of plastic or plastic, and the precision of powder output during grinding can be improved to ensure uniformity of powder output.

[0024] Preferably, a fixing frame is provided around the outer wall of the grinding chamber, and the fixing frame is fixedly connected to the housing;

[0025] The fixing frame is located at the lower end of the adjusting inner ring, the upper end of the fixing frame protrudes outward with a skirt, the threaded lower end of the inner wall of the adjusting outer ring protrudes inward with an annular protrusion, and the annular protrusion is engaged under the skirt of the fixing frame.

[0026] Specifically, there is an inner ring on the inner side of the fixing frame, and a screw hole is provided on the inner ring, which is fixedly connected to the shell through the screw hole; a second recessed portion is recessed outward on the inner ring, and the guide member extends into the guide groove through the first recessed portion of the positioning sleeve and the second recessed portion of the fixing frame; the fixing frame is used to fix the adjusting outer ring so that the adjusting outer ring and the adjusting inner ring form relative movement.

[0027] By sequentially adapting and connecting the fixing frame, the adjusting outer ring, the adjusting inner ring, the grinding disc support and the grinding disc, both a stable connection between each other and an adjustment function of the grinding disc are achieved.

[0028] Preferably, the middle of the powder sweeper is a turntable, and the side walls of the turntable are provided with a plurality of sweeping plates. The turntable is a hollow structure with an opening at one end, and the open end covers the bottom of the grinding chamber. The upper end of the turntable is provided with a plurality of raised connecting columns, and the bottom of the cutter head is provided with a plurality of connecting holes adapted to the connecting columns, and is connected to the powder sweeper through the connecting holes.

[0029] Specifically, the opening edge of the bottom of the grinding chamber has an upwardly raised annular partition, and the rotating disk is buckled on the periphery of the partition at the bottom opening of the grinding chamber; through the covering structure of the rotating disk and the partition of the powder sweeper, the powder sweeper can prevent powder particles from entering the opening at the bottom of the grinding chamber during the powder sweeping process;

[0030] The powder sweeper rotates with the rotation of the cutter head, the discharge port is located on the side wall of the grinding chamber and connected to the bottom of the grinding chamber, and the powder sweeper sweeps the ground powder particles to the discharge port through the sweeping plate when rotating.

[0031] Preferably, the drive shaft is sleeved with a drive bearing and a plane bearing;

[0032] A bearing channel is formed at the bottom of the grinding chamber and extends downward along the driving shaft, and the driving bearing is located in the bearing channel;

[0033] The plane bearings are respectively located at the upper end and the lower end of the driving bearing. The plane bearing located at the upper end is covered by the rotating disk of the powder sweeper, and the plane bearing located at the lower end is arranged outside the bearing channel.

[0034] Specifically, the plane bearing located at the upper end is located on the inner side of the partition; the two ends of the knife shaft are fixed by nuts, and the upper and lower ends of the knife shaft need to be pressed tightly when rotating to maintain its balance and stability. The axial friction force can be reduced by the axial action of the driving bearing, and the plane bearing can reduce the friction of its plane when the plane rotates.

[0035] Specifically, the driving device includes a transmission wheel, a driven wheel and a main driving wheel which are meshed with gears in sequence, the transmission wheel is connected to a motor, and the knife shaft is connected to the main driving wheel.

[0036] The speed change is achieved to increase the torque by meshing the transmission wheel, the driven wheel and the main drive wheel. The motor drives the transmission wheel to rotate, the transmission wheel drives the driven wheel to rotate, and then the driven wheel drives the main drive wheel to rotate. The main drive wheel drives the cutter shaft to rotate, thereby realizing the rotation of the cutter head.

[0037] A grinder using a coffee bean grinding structure as described above.

[0038] A coffee machine employs a coffee bean grinding structure as described above.

[0039] Compared with the prior art, the utility model achieves the following beneficial effects:

[0040] The utility model provides a coffee bean grinding structure, a grinder and a coffee machine. On the basis of keeping the overall structure as plastic or plastic material, an adaptor structure of a positioning sleeve is set. Only the positioning sleeve is added to keep the equipment cost low and the price is relatively cheap. At the same time, the high processing precision of the metal can make the minimum clearance fit between the grinding disc and the positioning sleeve, so as to ensure the concentricity of the grinding disc and the cutter head, avoid the uneven coarseness and cutter collision caused by the eccentricity and shaking of the grinding disc; finally, a low-cost device is achieved, and the coarseness and uniformity of the powder output can be ensured; during grinding, a large amount of static electricity is generated due to drying, and the ground fine powder is accompanied by static electricity. The conductive terminal of the positioning sleeve can guide the static electricity away through the ground wire, so as to avoid the situation that static electricity sticking powder and flying powder cause material blockage to the equipment, and also avoid the flying powder with static electricity causes damage to the electronic equipment such as burning. The grinding disc adjustment component structure is easy to disassemble and clean, and can be comparable to the precision of metal components, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of the structure of a coffee bean grinding structure in an embodiment of the utility model;

[0042] Figure 2 An exploded view of a coffee bean grinding structure in an embodiment of the utility model;

[0043] Figure 3 A cross-sectional view of a coffee bean grinding structure in an embodiment of the utility model;

[0044] Figure 4 This is a schematic structural diagram of a shell of a coffee bean grinding structure in an embodiment of the present utility model;

[0045] Figure 5 This is a schematic structural diagram of a cutter head of a coffee bean grinding structure in an embodiment of the utility model;

[0046] Figure 6 This is a schematic diagram of the structure of a grinding disc of a coffee bean grinding structure in an embodiment of the utility model;

[0047] Figure 7 This is a structural schematic diagram of a positioning sleeve of a coffee bean grinding structure in an embodiment of the utility model;

[0048] Figure 8 This is a schematic structural diagram of an adjusting inner ring of a coffee bean grinding structure in an embodiment of the utility model;

[0049] Fig. 9 This is a schematic diagram of the structure of an adjustable outer ring of a coffee bean grinding structure in an embodiment of the utility model;

[0050] Fig.10 This is a schematic structural diagram of a grinding disc support of a coffee bean grinding structure in an embodiment of the utility model;

[0051] Fig.11 This is a structural schematic diagram of a fixing frame of a coffee bean grinding structure in an embodiment of the utility model;

[0052] Fig.12 This is one of the structural schematic diagrams of a powder sweeper of a coffee bean grinding structure in an embodiment of the utility model;

[0053] Fig.13 This is a second structural schematic diagram of a powder sweeper for a coffee bean grinding structure in an embodiment of the utility model.

[0054] Reference numerals:

[0055] 101, housing; 102, grinding chamber; 103, guide groove; 104, partition; 105, discharge port; 106, bearing channel;

[0056] 201, cutter head; 202, connecting hole; 203, grinding disc; 204, annular edge;

[0057] 301, positioning sleeve; 302, conductive terminal; 303, first recessed portion;

[0058] 401, adjusting inner ring; 402, receiving part; 403, guide member; 404, limiting member;

[0059] 501, adjusting outer ring; 502, annular protrusion;

[0060] 601, grinding disc bracket; 602, ring edge; 603, fastener; 604, limit groove;

[0061] 701, fixed frame; 702, skirt; 703, inner ring; 704, second recessed portion;

[0062] 801, powder sweeper; 802, turntable; 803, sweeping plate; 804, connecting column;

[0063] 901, driving shaft; 902, driving bearing; 903, plane bearing;

[0064] 1001, driving device; 1002, transmission wheel; 1003, driven wheel; 1004, main driving wheel; 1005, motor. DETAILED DESCRIPTION

[0065] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments 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.

[0066] Example:

[0067] like Figures 1 to 13 A coffee bean grinding structure includes a housing 101, a grinding chamber 102 is provided on the housing 101, a vertical driving shaft 901 is provided in the grinding chamber 102, and a driving device 1001 is provided outside the grinding chamber 102 and is drivingly connected to the driving shaft 901; a discharge port 105 is provided at the bottom of the grinding chamber 102, and a powder sweeper 801 and a cutter head 201 are directly or indirectly drivingly connected to the driving shaft 901;

[0068] It also includes a metal grinding head assembly, which includes the cutter head 201, a grinding disc 203 arranged around the outer periphery of the cutter head 201, and a positioning sleeve 301 arranged around the outer periphery of the grinding disc 203, and a conductive terminal 302 is provided on the positioning sleeve 301.

[0069] The bottom of the grinding chamber 102 is provided with an opening, and the driving shaft 901 passes through the opening. Its two ends are respectively connected to the driving device 1001 and the cutter head 201, and the powder sweeper 801 is located in the chamber on the side where the cutter head 201 is located.

[0070] The housing 101 forming the grinding chamber 102 is made of plastic, and the positioning sleeve 301 is fixed and sealed to the inner wall of the grinding chamber 102 by interference fit.

[0071] The conductive terminal 302 may be connected to the ground wire and the positioning sleeve 301 by rivets.

[0072] It also includes a plastic grinding disc 203 adjustment component, which includes an adjustment outer ring 501 and an adjustment inner ring 401. The inner and outer rings have a mutually matching threaded structure, and the adjustment inner ring 401 and the outer wall of the shell 101 have an axially matching guide member 403 and a guide groove 103. The grinding disc 203 is relatively fixed to the adjustment inner ring 401.

[0073] The grinding disc 203 adjustment assembly is easy to disassemble and clean, while having the same precision as metal components at a lower cost.

[0074] The edge of the positioning sleeve 301 is folded outwards and sleeved on the inner wall of the grinding chamber 102;

[0075] The upper end of the grinding disc 203 protrudes outward with an annular edge 204, and a grinding disc bracket 601 is provided at the annular edge 204 of the grinding disc 203. The inner wall of the grinding disc bracket 601 protrudes inward with an annular edge 602 and a plurality of fasteners 603. The fasteners 603 are located at the lower end of the annular edge 602, and the annular edge 204 of the grinding disc 203 is fastened between the annular edge 602 and the fasteners 603 through the fasteners 603;

[0076] The outer wall of the grinding disc support 601 and the inner wall of the adjusting inner ring 401 are provided with a limiting groove 604 and a limiting member 404 that cooperate with each other. The inner side wall of the adjusting inner ring 401 protrudes inward to form an annular receiving portion 402. The limiting member 404 is located at the upper end of the receiving portion 402. The receiving portion 402 is located between the grinding disc support 601 and the folded portion of the edge of the positioning sleeve 301.

[0077] The grinding disc 203 is relatively fixed to the adjusting inner ring 401 via the grinding disc bracket 601 .

[0078] The folded portion of the edge of the positioning sleeve 301 is provided with a first recessed portion 303 corresponding to the guide groove 103, and the guide member 403 extends into the guide groove 103 through the first recessed portion 303 on the periphery of the positioning sleeve 301;

[0079] The matching connection between the guide member 403 and the guide groove 103 can avoid the rotation of the adjusting inner ring 401. Therefore, when the adjusting outer ring 501 drives the adjusting inner ring 401 to rotate, since the adjusting inner ring 401 cannot rotate, it can only move up and down along the guide groove 103. The grinding disc 203 is directly or indirectly lifted by the receiving part 402, so that the grinding disc 203 moves up, and then the distance between the grinding disc 203 and the cutter head 201 is changed, so as to adjust the uniformity of the coarseness of the powder output.

[0080] The grinding disc support 601 can improve the stability of the grinding disc 203, and at the same time can improve the uniformity of the coarseness of the powder produced during grinding;

[0081] The grinding disc bracket 601 stabilizes the grinding disc 203 through the ring edge 602 and the fastener 603, and at the same time, the outer wall is engaged with the adjustment inner ring 401 through the limit groove 604 and the limit member 404, so that the adjustment inner ring 401, the grinding disc bracket 601 and the grinding disc 203 move simultaneously.

[0082] The cutter head 201 is a frustum structure that gradually increases in size from top to bottom; the surface of the grinding disc 203 that is connected to the cutter head 201 is a curved structure that is narrow in the middle and wide at the top and bottom, and the narrow-to-wide portion of the lower end of the grinding disc 203 is adapted to the lower side of the cutter head 201.

[0083] The coffee beans are placed between the cutter head 201 and the grinding disc 203 for grinding. Since the positioning sleeve 301 is fixed around and sleeved on the circumference of the grinding disc 203, the grinding stability can be improved. At the same time, the precision of metal is higher than that of plastic or plastic, and the precision of powder output during grinding can be improved to ensure uniformity of powder output.

[0084] A fixing frame 701 is provided around the outer wall of the grinding chamber 102, and the fixing frame 701 is fixedly connected to the housing 101;

[0085] The fixing frame 701 is located at the lower end of the adjusting inner ring 401 , and a skirt 702 protrudes outward from the upper end of the fixing frame 701 . An annular protrusion 502 protrudes inward from the threaded lower end of the inner wall of the adjusting outer ring 501 , and the annular protrusion 502 is engaged under the skirt 702 of the fixing frame 701 .

[0086] The outer side wall of the adjusting outer ring 501 is also provided with a plurality of vertical protrusions.

[0087] The inner side of the fixing frame 701 is provided with an inner ring 703, and the inner ring 703 is provided with screw holes, and is fixedly connected to the shell 101 through the screw holes; the inner ring 703 is recessed outward with a second recessed portion 704, and the guide member 403 extends into the guide groove 103 through the first recessed portion 303 of the positioning sleeve 301 and the second recessed portion 704 of the fixing frame 701; the fixing frame 701 is used to fix the adjusting outer ring 501, so that the adjusting outer ring 501 and the adjusting inner ring 401 form relative movement.

[0088] By means of the sequentially adapted connection relationship among the fixing frame 701 , the adjusting outer ring 501 , the adjusting inner ring 401 , the grinding disc support 601 and the grinding disc 203 , both a stable connection between them and an adjustment function of the grinding disc 203 are achieved.

[0089] The center of the powder sweeper 801 is a turntable 802, and the side walls of the turntable 802 are provided with a plurality of sweeping plates 803. The turntable 802 is a hollow structure with an opening at one end, and the open end covers the bottom of the grinding chamber 102. The upper end of the turntable 802 is provided with a plurality of raised connecting posts 804, and the bottom of the cutter head 201 is provided with a plurality of connecting holes 202 adapted to the connecting posts 804, and the cutter head 201 is connected to the powder sweeper 801 through the connecting holes 202.

[0090] The opening edge of the bottom of the grinding chamber 102 has an upwardly raised annular partition 104, and the rotating disk 802 is buckled on the periphery of the partition 104 at the bottom opening of the grinding chamber 102; through the covering structure of the rotating disk 802 and the partition 104 of the powder sweeper 801, the powder sweeper 801 can prevent powder particles from entering the opening at the bottom of the grinding chamber 102 during the powder sweeping process;

[0091] The powder sweeper 801 rotates along with the rotation of the cutter head 201 . The discharge port 105 is located on the side wall of the grinding chamber 102 and connected to the bottom of the grinding chamber 102 . When the powder sweeper 801 rotates, it sweeps the ground powder particles to the discharge port 105 through the sweeping plate 803 .

[0092] The driving shaft 901 is provided with a driving bearing 902 and a plane bearing 903;

[0093] A bearing channel 106 is formed at the bottom of the grinding chamber 102 and extends downward along the driving shaft 901 . The driving bearing 902 is located in the bearing channel 106 .

[0094] The plane bearings 903 are respectively located at the upper end and the lower end of the driving bearing 902 . The plane bearing 903 located at the upper end is covered by the turntable 802 of the powder sweeper 801 , and the plane bearing 903 located at the lower end is arranged outside the bearing channel 106 .

[0095] The plane bearing 903 at the upper end is located on the inner side of the partition 104; the two ends of the knife shaft are fixed by nuts, and the upper and lower ends of the knife shaft need to be pressed tightly when rotating to maintain its balance and stability. The axial friction can be reduced by the axial action of the driving bearing 902, and the plane bearing 903 can reduce the friction of its plane when it rotates in a plane.

[0096] The driving device 1001 includes a transmission wheel 1002 , a driven wheel 1003 and a main driving wheel 1004 which are meshed with gears in sequence. The transmission wheel 1002 is connected to a motor 1005 , and the knife shaft is connected to the main driving wheel 1004 .

[0097] The transmission wheel 1002, the driven wheel 1003 and the main drive wheel 1004 are meshed with each other to achieve speed change to increase torque. The motor 1005 drives the transmission wheel 1002 to rotate, the transmission wheel 1002 drives the driven wheel 1003 to rotate, and the driven wheel 1003 drives the main drive wheel 1004 to rotate. The main drive wheel 1004 drives the cutter shaft to rotate, thereby realizing the rotation of the cutter head 201.

[0098] A grinder employs the coffee bean grinding structure as described above.

[0099] A coffee machine uses the coffee bean grinding structure as described above.

[0100] The utility model provides a coffee bean grinding structure, a grinder and a coffee machine. On the basis of keeping the overall structure as plastic or plastic material, an adapting structure of a positioning sleeve 301 is set. Only the positioning sleeve 301 is added to keep the equipment cost low and the price relatively cheap. At the same time, the grinding disc 203 and the positioning sleeve 301 can be matched with the minimum gap through the high processing precision of the metal, so as to ensure the concentricity of the grinding disc 203 and the cutter head 201, avoid the uneven coarseness and the collision with the cutter caused by the eccentricity and shaking of the grinding disc 203; finally, a low-cost equipment is achieved, and the coarseness and uniformity of the powder output can be ensured; during grinding, a large amount of static electricity is generated due to drying, and the fine powder ground is accompanied by static electricity. The conductive terminal 302 of the positioning sleeve 301 can guide the static electricity away through the ground wire, so as to avoid the situation that static electricity sticking powder and flying powder cause material blockage to the equipment, and also avoid the flying powder with static electricity causes damage to the electronic equipment such as burning. The grinding disc 203 adjustment component structure is easy to disassemble and clean, and can be comparable to the precision of metal components, and the cost is low.

[0101] According to the disclosure and teaching of the above specification, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the specific implementation methods disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.

Claims

1. A coffee bean grinding structure, comprising a shell, a grinding chamber is provided on the shell, a vertical driving shaft is provided in the grinding chamber, and a driving device is provided outside the grinding chamber and is drivingly connected to the driving shaft; a discharge port is provided at the bottom of the grinding chamber, and a powder sweeper and a cutter head are directly or indirectly drivingly connected to the driving shaft; It is characterized in that The metal grinding head assembly comprises the cutter head, a grinding disc arranged around the outer periphery of the cutter head, and a positioning sleeve arranged around the outer periphery of the grinding disc, wherein a conductive terminal is arranged on the positioning sleeve.

2. A coffee bean grinding structure according to claim 1, It is characterized in that The shell forming the grinding chamber is made of plastic, and the positioning sleeve is installed, fixed and sealed with the inner wall of the grinding chamber through interference fit.

3. The coffee bean grinding structure according to claim 1, It is characterized in that It also includes a plastic grinding disc adjustment component, which includes an adjustment outer ring and an adjustment inner ring. The inner and outer rings have a mutually matching threaded structure, and the adjustment inner ring and the outer wall of the shell have an axially matching guide and guide groove. The grinding disc is relatively fixed to the adjustment inner ring.

4. A coffee bean grinding structure according to claim 3, It is characterized in that The edge of the positioning sleeve is folded outwards and sleeved on the inner wall of the grinding chamber; The upper end of the grinding disc protrudes outward with an annular edge, a grinding disc bracket is provided at the annular edge of the grinding disc, the inner wall of the grinding disc bracket protrudes inward with an annular edge and a plurality of fasteners, the fasteners are located at the lower end of the annular edge, and the annular edge of the grinding disc is fastened between the annular edge and the fasteners through the fasteners; There are mutually matching limiting grooves and limiting members between the outer wall of the grinding disc support and the inner wall of the adjusting inner ring, the inner side wall of the adjusting inner ring protrudes inward to form an annular receiving portion, the limiting member is located at the upper end of the receiving portion, and the receiving portion is located between the grinding disc support and the folded portion of the edge of the positioning sleeve; The grinding disc is relatively fixed to the adjusting inner ring through a grinding disc bracket.

5. The coffee bean grinding structure according to claim 1, It is characterized in that The cutter head is a frustum structure that gradually increases in size from top to bottom; the surface of the grinding disc that meets the cutter head is a curved structure that is narrow in the middle and wide at the top and bottom, and the narrow-to-wide portion of the lower end of the grinding disc is adapted to the lower side of the cutter head.

6. The coffee bean grinding structure according to claim 1, It is characterized in that A fixing frame is provided around the outer wall of the grinding chamber, and the fixing frame is fixedly connected to the housing; The fixing frame is located at the lower end of the adjusting inner ring, the upper end of the fixing frame protrudes outward with a skirt, the threaded lower end of the inner wall of the adjusting outer ring protrudes inward with an annular protrusion, and the annular protrusion is engaged under the skirt of the fixing frame.

7. The coffee bean grinding structure according to claim 1, It is characterized in that The middle of the powder sweeper is a turntable, and the side walls of the turntable are provided with a plurality of sweeping plates. The turntable is a hollow structure with an opening at one end, and the open end covers the bottom of the grinding chamber. The upper end of the turntable is provided with a plurality of raised connecting columns, and the bottom of the cutter head is provided with a plurality of connecting holes adapted to the connecting columns, and the cutter head is connected with the powder sweeper through the connecting holes.

8. The coffee bean grinding structure according to claim 1, It is characterized in that The driving shaft is sleeved with a driving bearing and a plane bearing; A bearing channel is formed at the bottom of the grinding chamber and extends downward along the driving shaft, and the driving bearing is located in the bearing channel; The plane bearings are respectively located at the upper end and the lower end of the driving bearing. The plane bearing located at the upper end is covered by the rotating disk of the powder sweeper, and the plane bearing located at the lower end is arranged outside the bearing channel.

9. A grinding machine, It is characterized in that A coffee bean grinding structure as described in any one of claims 1 to 8 is used.

10. A coffee machine, It is characterized in that A coffee bean grinding structure as described in any one of claims 1 to 8 is used.

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