Grinding device of coffee machine

Abstract

The utility model discloses a grinding device of a coffee machine, which comprises a grinding base, a transmission shaft, a gear motor and a grinding cutter group sleeved on the transmission shaft, the grinding cutter group is arranged in a grinding cavity of the grinding base, a bearing seat hole is arranged at the bottom of the grinding cavity, and the transmission shaft is rotatably arranged in the bearing seat hole through a plurality of bearings. An output shaft of the gear motor is movably connected with the lower end of the transmission shaft; the grinding cutter set comprises an outer grinding cutter and an inner grinding cutter, the outer grinding cutter is annular, the inner grinding cutter is arranged in the outer grinding cutter, the outer grinding cutter is arranged in the grinding cavity through the lifting adjusting mechanism, and the transmission shaft penetrates through a center hole of the inner grinding cutter and drives the inner grinding cutter to rotate in the outer grinding cutter. According to the device, noise can be greatly reduced, and meanwhile it is guaranteed that coffee powder uniform in thickness can be ground through the inner grinding cutter and the outer grinding cutter.

Description

Technical Field

[0001] The utility model relates to the technical field of coffee machines, and particularly relates to a grinding device of a coffee machine. Background Art

[0002] Coffee has become one of people's daily beverages. Compared with instant coffee, freshly ground coffee is made by directly grinding coffee beans into coffee powder and then brewing and extracting. The materials are natural and it is easy to control the quality of coffee beans. In addition, the substances in coffee are continuously lost as the oxidation time increases, and freshly ground coffee can play a more refreshing role.

[0003] When making freshly ground coffee, it is first necessary to grind coffee beans into coffee powder, which is generally achieved by a manual or electric grinder. A fully automatic coffee machine refers to a machine that can make a cup of coffee by simply pressing a button, realizing the whole process automation from grinding coffee beans into powder to brewing coffee with hot water, including a grinding device, an automatic heating device, a brewing device, a cleaning device, and an intelligent control module, etc. The coffee bean grinding device is the core component of these coffee machines, and the particle size, particle uniformity, and particle shape of the coffee powder can all affect the taste of coffee brewing.

[0004] It is found in production practice that the existing coffee bean grinding device is usually realized by driving a grinding knife set with a motor. The grinding knife set is usually composed of an outer grinding knife and an inner grinding knife which are sleeved with each other. The motor drives the inner grinding knife to rotate inside the outer grinding knife. Coffee beans are introduced from the upper end of the grinding knife set for crushing and are ground and discharged from the lower end of the grinding knife set after being ground into powder. The existing grinding device usually has a complex structure and poor coaxial stability between the inner grinding knife and the outer grinding knife, resulting in high noise during coffee bean grinding and low particle size uniformity of the coffee powder. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a grinding device of a coffee machine, aiming to solve the technical problem that the coaxial stability between the inner grinding knife and the outer grinding knife in the existing grinding device is poor, resulting in high noise during coffee bean grinding and low particle size uniformity of the coffee powder.

[0006] In order to solve the above technical problem, the technical solution of the utility model is as follows:

[0007] The utility model provides a grinding device for a coffee machine, which comprises a grinding base, a transmission shaft, a reduction motor, and a grinding cutter set sleeved on the transmission shaft. The grinding cutter set is arranged in a grinding cavity of the grinding base. A bearing seat hole is arranged at the bottom of the grinding cavity. The transmission shaft is rotatably arranged in the bearing seat hole through a plurality of bearings. The output shaft of the reduction motor is movably connected to the lower end of the transmission shaft; The grinding cutter set includes an outer grinding cutter and an inner grinding cutter. The outer grinding cutter is annular and the inner grinding cutter is arranged inside the outer grinding cutter. The outer grinding cutter is arranged in the grinding cavity through a lifting adjustment mechanism. The transmission shaft passes through a central hole of the inner grinding cutter and drives the inner grinding cutter to rotate inside the outer grinding cutter;

[0008] The lifting adjustment mechanism includes a pressing disc, a cutter support ring frame, and a lifting ring seat arranged in sequence. A fixed ring part of the outer grinding cutter is arranged on the cutter support ring frame. The pressing disc movably presses the outer grinding cutter on the cutter support ring frame from the opening position of the grinding cavity. The cutter support ring frame is arranged inside the lifting ring seat. Both the lifting ring seat and the grinding base are made of hard materials. The outer peripheral wall of the lifting ring seat fits and relatively moves with the inner peripheral wall of the grinding cavity of the grinding base.

[0009] Specifically, an adjustment transmission ring is arranged on an adjustment external thread part corresponding to the outer peripheral wall of the lifting ring seat. The adjustment transmission ring is arranged inside an adjustment rotating seat. The adjustment rotating seat is axially rotatably buckled on the upper end of the grinding base. An adjustment wheel is buckled on the adjustment rotating seat from the opening position of the grinding cavity. The adjustment wheel drives the lifting ring seat to move inside the grinding cavity, so that the gap between the inner grinding cutter and the outer grinding cutter changes accordingly.

[0010] Furthermore, a plurality of radial guide pins are evenly arranged along the circumferential direction on the outer peripheral wall of the lifting ring seat. Corresponding to the radial guide pins, lifting guide grooves are arranged on the inner axial wall of the grinding cavity.

[0011] Furthermore, the lower side of the lifting ring seat is correspondingly arranged on a lifting bearing ring arranged inside the grinding cavity. A plurality of axial guide columns are arranged on the lower side of the cutter support ring frame. Corresponding to the axial guide columns, corresponding axial guide holes are arranged on a support ring part of the lifting ring seat. Corresponding lifting guide holes are arranged on the lifting bearing ring corresponding to the axial guide holes. The axial guide columns pass through the axial guide holes and are axially positioned and matched with the lifting guide holes.

[0012] Specifically, the pressing disc is annular. A pressing table part is arranged inside the pressing disc. A plurality of pressing buckle parts are arranged at the lower end edge of the pressing disc. The fixed ring part of the outer grinding cutter is arranged on the pressing table part. The pressing buckle parts cooperate with the fixed ring part.

[0013] Specifically, the tool supporting ring frame is annular. A tool supporting ring part is arranged inside the tool supporting ring frame. The fixed ring part of the outer grinding tool is arranged between the pressing table part and the tool supporting ring part. A plurality of tightening groove parts are arranged on the outer peripheral wall of the pressing disc, and a plurality of tightening protrusion parts are correspondingly arranged on the inner peripheral wall of the tool supporting ring frame.

[0014] Specifically, the lifting ring seat includes a supporting ring part that cooperates with the bottom of the tool supporting ring frame. A plurality of ring frame connection holes are arranged on the supporting ring part, and a plurality of ring frame connection columns are correspondingly arranged at the bottom of the tool supporting ring frame corresponding to the ring frame connection holes.

[0015] Specifically, the part of the outer periphery of the lifting ring seat that is higher than the opening of the grinding cavity is provided with an adjusting external thread part. An adjusting transmission ring is sleeved on the adjusting external thread part, and an adjusting internal thread part that cooperates with the adjusting external thread part is arranged on the inner wall of the adjusting transmission ring.

[0016] Specifically, the adjusting rotating seat is also annular. A transmission ring fixing part is arranged inside the adjusting rotating seat. The adjusting transmission ring is arranged on the transmission ring fixing part. Corresponding first screw holes and second screw holes are arranged on the adjusting transmission ring and the adjusting rotating seat. A plurality of adjusting buckle parts are arranged at the lower end of the adjusting rotating seat, and an adjusting clamping ring part is arranged at the upper end of the grinding base corresponding to the adjusting buckle parts, so that the adjusting rotating seat is axially rotatably installed at the opening position of the grinding cavity.

[0017] Specifically, the adjusting wheel is provided with a feeding port corresponding to the grinding cavity. A plurality of vertical rib parts are arranged along the circumference on the inner wall communicating with the feeding port. The adjusting wheel is buckled on the adjusting rotating seat. An adjusting tooth groove part is arranged on the outer peripheral wall of the adjusting rotating seat, and the vertical rib parts cooperate with the adjusting tooth groove part.

[0018] Furthermore, the grinding tool group further includes a powder scraping plate. The powder scraping plate is sleeved inside the transmission shaft at the bottom of the inner grinding tool. The powder scraping plate fits against the bottom wall of the grinding cavity, and the powder scraping plate and the inner grinding tool rotate synchronously.

[0019] Specifically, the transmission shaft includes a transmission shaft hole arranged at the bottom, a bearing retaining table, a shaft key part and a threaded end are sequentially arranged along the length direction; the transmission shaft hole is movably and cooperatively connected with the output shaft of the reduction motor; the center of the powder scraping plate is arranged on the shaft key part through a key hole, the central hole of the inner grinding tool is sleeved between the shaft key part and the threaded end, and a plurality of transmission pins are further arranged on the powder scraping plate around the key hole, and transmission pin holes are arranged at the bottom of the inner grinding tool corresponding to the transmission pins.

[0020] Further, a plurality of radial powder scraping blocks are axially inclined in the circumferential direction on the upper part of the powder scraping plate. An insertion ring portion is arranged around the key hole at the lower part of the powder scraping plate. A powder scraping ring groove is arranged at the bottom of the grinding cavity corresponding to the insertion ring portion. A sealing ring groove is further arranged around the outer periphery of the powder scraping ring groove at the bottom of the grinding cavity. A wool ring is arranged in the sealing ring groove.

[0021] Further, a plurality of circumferential powder scraping blocks are arranged on the radial outer peripheral edge of the powder scraping plate. The circumferential powder scraping blocks cooperate with the bottom and side walls of the grinding cavity. An insertion ring portion is arranged around the key hole at the lower part of the powder scraping plate. A wool ring is further arranged between the insertion ring portion and the bottom of the grinding cavity.

[0022] Specifically, the transmission shaft is arranged in the bearing seat hole in the grinding base through at least one set of bearings between the bearing retaining platforms; a snap ring is further arranged on the lower side of the transmission shaft, and one set of the bearings is arranged between the snap ring and the bearing retaining platform.

[0023] Further, the grinding base further includes a base ring portion surrounding the grinding cavity. A plurality of shock-absorbing fixing holes are arranged on the base ring portion. A plurality of driving connection columns are arranged at the lower part of the grinding base. The reduction motor is fixedly connected to the driving connection columns through a driving mounting seat.

[0024] Further, the driving mounting seat includes a transmission through hole, and a driving connection groove is arranged around one side of the transmission through hole. The driving connection groove is sleeved on the outer periphery of the bearing seat hole at the bottom of the grinding base; a driving connection hole cooperating with the driving connection column is further arranged on the driving mounting seat; a plurality of motor fixing buckle portions and a motor fixing seat are arranged on the other side of the transmission through hole. A motor ring portion and a motor fixing hole are arranged around the output shaft on the reduction motor.

[0025] With the above technical solutions, for the grinding device of the coffee machine in the embodiment of the present invention, since the inner grinding knife is installed in the bearing seat hole in the grinding base through the transmission shaft and bearings, and the outer grinding knife is arranged in the grinding cavity through the lifting ring seat, and the grinding base, the transmission shaft, the lifting ring seat, the inner grinding knife, and the outer grinding knife are all made of hard materials. When the inner grinding knife and the outer grinding knife grind and extrude each other, when the machining accuracy of the grinding base meets the requirements, there will be no deformation error in the coaxiality between the inner grinding knife and the outer grinding knife. In addition, since the output shaft of the reduction motor is movably connected to the transmission shaft, the output shaft will not affect the coaxiality between the transmission shaft, the inner grinding knife, and the outer grinding knife. While greatly reducing the noise, it ensures that the inner grinding knife and the outer grinding knife can grind out coffee powder with uniform thickness. Description of the Drawings

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 3D structure diagram of the grinding device of the first coffee machine according to the embodiment of the present invention;

[0028] Figure 2 First perspective 3D exploded structure diagram of the grinding device of the first coffee machine according to the embodiment of the present invention;

[0029] Figure 3 Top view structure diagram of the grinding device of the first coffee machine according to the embodiment of the present invention;

[0030] Figure 4 For Figure 3 Cross-sectional structure diagram along A-A in

[0031] Figure 5 Second perspective 3D exploded structure diagram of the grinding device of the first coffee machine according to the embodiment of the present invention;

[0032] Figure 6 Third perspective 3D exploded structure diagram of the grinding device of the first coffee machine according to the embodiment of the present invention;

[0033] Figure 7 First perspective partial omitted 3D exploded structure diagram of the grinding device of the first coffee machine according to the embodiment of the present invention;

[0034] Figure 8 Second perspective partial omitted 3D exploded structure diagram of the grinding device of the first coffee machine according to the embodiment of the present invention;

[0035] Figure 9 3D structure diagram of the grinding base according to the embodiment of the present invention;

[0036] Figure 10 3D structure diagram of the transmission shaft according to the embodiment of the present invention;

[0037] Figure 11 3D structure diagram of the grinding device of the second coffee machine according to the embodiment of the present invention;

[0038] Figure 12 Cross-sectional structure diagram of the grinding device of the second coffee machine according to the embodiment of the present invention;

[0039] Figure 13Cross-sectional structure diagram of the grinding device of the third coffee machine according to the embodiment of the present utility model;

[0040] Figure 14 Three-dimensional decomposition structure diagram of the grinding device of the second coffee machine according to the embodiment of the present utility model from the first perspective;

[0041] Figure 15 Three-dimensional decomposition structure diagram of the grinding device of the second coffee machine according to the embodiment of the present utility model from the second perspective;

[0042] Figure 16 Three-dimensional decomposition structure diagram of the grinding device of the third coffee machine according to the embodiment of the present utility model from the first perspective;

[0043] Figure 17 Three-dimensional decomposition structure diagram of the grinding device of the third coffee machine according to the embodiment of the present utility model from the second perspective;

[0044] In the figure, 10 - grinding base, 11 - grinding chamber, 12 - bearing seat hole, 13 - powder scraping ring groove, 14a - sealing ring groove, 14b - lifting bearing ring, 15a - lifting guide groove, 15b - lifting guide hole, 16 - base ring part, 17 - shock absorption fixing hole, 18 - driving connection column, 19 - adjusting snap ring part, 1101 - powder discharge port;

[0045] 20 - inner grinding knife, 21 - central hole, 22 - transmission pin hole;

[0046] 30 - outer grinding knife, 31 - fixing ring part;

[0047] 40 - transmission shaft, 41 - transmission shaft hole, 42 - bearing retaining platform, 43 - shaft key part, 44 - threaded end;

[0048] 50 - reduction motor, 51 - output shaft, 52 - motor ring part, 53 - motor fixing hole;

[0049] 60 - driving mounting seat, 61 - transmission through hole, 62 - driving connection groove, 63 - driving connection hole, 64 - motor fixing buckle part, 65 - motor fixing seat;

[0050] 70 - bearing;

[0051] 80 - snap ring;

[0052] 90 - pressing disc, 91 - pressing platform part, 92 - pressing buckle part, 93 - tightening groove part;

[0053] 100 - tool supporting ring frame, 101 - tool supporting ring part, 102 - tightening protrusion, 103 - ring frame connection column, 104 - axial guiding column;

[0054] 110 - Lifting ring seat, 111 - Support ring part, 112 - Ring frame connection hole, 113 - Adjusting external thread part, 114a - Radial guide pin, 114b - Axial guiding hole;

[0055] 120 - Adjusting drive ring, 121 - Adjusting internal thread part, 122 - First screw hole;

[0056] 130 - Adjusting rotating seat, 131 - Drive ring fixing part, 132 - Adjusting snap part, 133 - Second screw hole, 134 - Adjusting tooth groove part;

[0057] 140 - Adjusting wheel, 141 - Feeding port, 142 - Vertical rib part, 143 - Marking part;

[0058] 150 - Scraping powder plate, 151 - Key hole, 152 - Drive pin, 153a - Radial powder scraping block, 153b - Circumferential powder scraping block, 154 - Insertion ring part;

[0059] 160 - Woolen ring, 170 - Nut, 180 - Gasket, 190 - Handle, 200 - Powder discharging guide groove part, 210 - Sealing ring. Detailed implementation mode

[0060] The following further describes the detailed implementation mode of the present utility model in conjunction with the accompanying drawings. It should be noted here that the description of these implementation modes is used to help understand the present utility model, but does not constitute a limitation to the present utility model. In addition, the technical features involved in the various implementation modes of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0061] Embodiment 1

[0062] As Figure 1-6 shown, the embodiment of the present utility model provides a grinding device for a coffee machine, including a grinding base 10, a transmission shaft 40, a reduction motor 50, a grinding knife set sleeved on the transmission shaft 40. The grinding knife set is arranged in a grinding cavity 11 of the grinding base 10. A bearing seat hole 12 is arranged at the bottom of the grinding cavity 11. The transmission shaft 40 is rotatably arranged in the bearing seat hole 12 through a plurality of bearings 70. The output shaft 51 of the reduction motor 50 is movably connected to the lower end of the transmission shaft 40. The grinding knife set includes an outer grinding knife 30 and an inner grinding knife 20. The outer grinding knife 30 is annular and the inner grinding knife 20 is arranged inside the outer grinding knife 30. The outer grinding knife 30 is arranged in the grinding cavity 11 through a lifting adjustment mechanism. The transmission shaft 40 passes through a central hole 21 of the inner grinding knife 20 and drives the inner grinding knife 20 to rotate inside the outer grinding knife 30;

[0063] The lifting and adjusting mechanism includes a pressing disc 90, a tool carrier ring frame 100, and a lifting ring seat 110 arranged in sequence. The fixed ring portion 31 of the outer grinding tool 30 is arranged on the tool carrier ring frame 100. The pressing disc 90 movably presses the outer grinding tool 30 against the tool carrier ring frame 100 from the opening position of the grinding cavity 11. The tool carrier ring frame 100 is arranged inside the lifting ring seat 110. Both the lifting ring seat 110 and the grinding base 10 are made of hard materials. The outer peripheral wall of the lifting ring seat 110 fits and relatively moves with the inner peripheral wall of the grinding cavity 11 of the grinding base 10.

[0064] Specifically, an adjusting transmission ring 120 is arranged on the adjusting external thread portion 113 corresponding to the outer peripheral wall of the lifting ring seat 110. The adjusting transmission ring 120 is arranged inside an adjusting rotating seat 130. The adjusting rotating seat 130 is axially rotationally buckled on the upper end of the grinding base 10. Corresponding to the adjusting rotating seat 130, an adjusting wheel 140 is buckled from the opening position of the grinding cavity 11. The adjusting wheel 140 drives the lifting ring seat 110 to move inside the grinding cavity 11, so that the gap between the inner grinding tool 20 and the outer grinding tool 30 changes accordingly. Thus, the grinding device can grind coffee powder with different particle sizes.

[0065] As Figure 11-13 shown, a sealing ring 210 is arranged at the fitting position where the lower part of the lifting ring seat 110 cooperates with the grinding cavity 11.

[0066] As Figure 7 、 8 shown, a plurality of radial guide pins 114a are evenly arranged along the circumferential direction on the outer peripheral wall of the lifting ring seat 110. Corresponding to the radial guide pins 114a, lifting guide grooves 15a are arranged on the inner axial wall of the grinding cavity 11. As Figure 14-17 shown, the lower side of the lifting ring seat 110 is correspondingly arranged on a lifting bearing ring 14b arranged inside the grinding cavity 11. A plurality of axial guide columns 104 are arranged on the lower side of the tool carrier ring frame 100. Corresponding to the axial guide columns 104, corresponding axial guide holes 114b are arranged on the supporting ring portion 111 of the lifting ring seat 110. Corresponding to the axial guide holes 114b on the lifting bearing ring 14b, mutually corresponding lifting guide holes 15b are arranged. The axial guide columns 104 pass through the axial guide holes 114b and are axially positioned and matched with the lifting guide holes 15b.

[0067] Generally, the higher the coaxiality of the inner grinding knife and the outer grinding knife, the more uniform the particle size of the ground coffee powder. The coffee brewed with this uniformly sized coffee powder has a good taste, and the uniformly sized coffee powder is more aesthetically pleasing. In this utility model, the grinding base, the transmission shaft, the lifting ring seat, the inner grinding knife, and the outer grinding knife are all made of hard materials, such as metals, ceramics, fiberglass, etc. When the inner grinding knife and the outer grinding knife grind and squeeze each other, since the inner grinding knife is installed in the bearing seat hole of the grinding base through the transmission shaft and bearings, and the outer grinding knife is arranged in the grinding cavity through the lifting ring seat, when the machining accuracy of the grinding base meets the requirements, there will be no deformation error in the coaxiality between the inner grinding knife and the outer grinding knife. In addition, since the output shaft of the reduction motor is movably connected to the transmission shaft, the output shaft will not affect the coaxiality between the transmission shaft, the inner grinding knife, and the outer grinding knife.

[0068] Such as Figure 7 , 8 As shown in the figure, the pressing disc 90 is annular. A pressing table portion 91 is provided inside the pressing disc 90. A plurality of pressing buckle portions 92 are provided at the lower edge of the pressing disc 90. The fixing ring portion 31 of the outer grinding knife 30 is arranged on the pressing table portion 91, and the pressing buckle portions 92 cooperate with the fixing ring portion 91.

[0069] Such as Figure 7 , 8 As shown in the figure, the tool supporting ring frame 100 is annular. A tool supporting ring portion 101 is provided inside the tool supporting ring frame 100. The fixing ring portion 31 of the outer grinding knife 30 is arranged between the pressing table portion 91 and the tool supporting ring portion 101. A plurality of tightening groove portions 93 are provided on the outer peripheral wall of the pressing disc 90, and a plurality of tightening protrusion portions 102 are provided on the inner peripheral wall of the tool supporting ring frame 100 corresponding to the tightening groove portions 93.

[0070] Optionally, a handle 190 is further provided at the upper end of the pressing disc 90 for rotating and opening the pressing disc 90, so as to remove the grinding knife set and clean the grinding device. Such as Figure 7 , 8 As shown in the figure, the lifting ring seat 110 includes a supporting ring portion 111 that cooperates with the bottom of the tool supporting ring frame 100. A plurality of ring frame connection holes 112 are provided on the supporting ring portion 111, and a plurality of ring frame connection columns 103 are provided at the bottom of the tool supporting ring frame 100 corresponding to the ring frame connection holes 112.

[0071] Such as Figure 14-17As shown, a part of the outer circumference of the lifting ring seat 110 that is higher than the opening of the grinding chamber 11 is provided with an adjusting external thread portion 113. An adjusting transmission ring 120 is sleeved on the adjusting external thread portion 113, and an adjusting internal thread portion 121 that cooperates with the adjusting external thread portion 113 is provided on the inner wall of the adjusting transmission ring 120. Optionally, another sealing ring 210 is provided at the mating position of the adjusting external thread portion 113 and the adjusting internal thread portion 121.

[0072] Specifically, the adjusting rotating seat 130 is also annular. A transmission ring fixing portion 131 is provided inside the adjusting rotating seat 130. The adjusting transmission ring 120 is arranged on the transmission ring fixing portion 131. Corresponding first screw holes 122 and second screw holes 133 are provided on the adjusting transmission ring 120 and the adjusting rotating seat 130. A plurality of adjusting buckle portions 132 are provided at the lower end of the adjusting rotating seat 130. Corresponding to the adjusting buckle portions 132, an adjusting snap ring portion 19 is provided at the upper end of the grinding base 10, so that the adjusting rotating seat 130 is axially rotatably installed at the opening position of the grinding chamber 11.

[0073] Specifically, the adjusting wheel 140 is provided with a feeding port 141 corresponding to the grinding chamber 11. A plurality of vertical rib portions 142 are arranged along the circumference on the inner wall communicating with the feeding port 141. The adjusting wheel 40 is buckled on the adjusting rotating seat 130. An adjusting tooth groove portion 134 is provided on the outer peripheral wall of the adjusting rotating seat 130. The vertical rib portions 142 cooperate with the adjusting tooth groove portion 134.

[0074] Optionally, a marking portion 143 is further provided on the upper surface of the adjusting wheel 140 for marking the gap size between the inner grinding tool 20 and the outer grinding tool 30.

[0075] As Figure 7 、 8 shown, the grinding tool group further includes a powder scraping plate 150. The powder scraping plate 150 is sleeved inside the transmission shaft 40 at the bottom of the inner grinding tool 20. The powder scraping plate 150 is attached to the bottom wall of the grinding chamber 11. The powder scraping plate 150 and the inner grinding tool 20 rotate synchronously.

[0076] As Figure 10As shown, the transmission shaft 40 includes a transmission shaft hole 41 provided at the bottom, a bearing retaining table 42, a shaft key portion 43, and a threaded end 44 arranged in sequence along the length direction; the transmission shaft hole 41 is movably and cooperatively connected to the output shaft 51 of the reduction motor 50; the center of the powder scraping plate 150 is provided on the shaft key portion 43 through a key hole 151, the central hole 21 of the inner grinding tool 20 is sleeved between the shaft key portion 43 and the threaded end 44, and a plurality of transmission pins 152 are further provided on the powder scraping plate 150 around the key hole 151, and transmission pin holes 22 are provided at the bottom of the inner grinding tool 20 corresponding to the transmission pins 152.

[0077] Optionally, a spline fit is provided between the transmission shaft hole 41 and the output shaft 51 of the reduction motor 50.

[0078] As Figure 5 、 6 As shown, a plurality of radial powder scraping blocks 153a are axially inclined in the circumferential direction on the upper part of the powder scraping plate 150, an insertion ring portion 154 is provided around the key hole 151 on the lower part of the powder scraping plate 150, a powder scraping ring groove 13 is provided at the bottom of the grinding cavity 11 corresponding to the insertion ring portion 154, a sealing ring groove 14a is further provided around the outer circumference of the powder scraping ring groove 14a at the bottom of the grinding cavity 11, and a wool ring 160 is provided in the sealing ring groove 14a.

[0079] As Figure 16 、 17 As shown, a plurality of circumferential powder scraping blocks 153b are provided on the radially outer peripheral edge of the powder scraping plate 150, the circumferential powder scraping blocks 153b cooperate with the bottom and side walls of the grinding cavity 11, an insertion ring portion 154 is provided around the key hole 151 on the lower part of the powder scraping plate 150, and a wool ring 210 is further provided between the insertion ring portion 154 and the bottom of the grinding cavity 11.

[0080] Specifically, the transmission shaft 40 is arranged in the bearing seat hole 12 in the grinding base 10 through at least one set of bearings 70 between the bearing retaining tables 42; a snap ring 80 is further provided on the lower side of the transmission shaft 40, and one set of the bearings 70 is arranged between the snap ring 80 and the bearing retaining table 42.

[0081] Optionally, a nut 170 and a gasket 180 are provided corresponding to the threaded end 44.

[0082] As Figure 9 As shown, the grinding base 10 further includes a base ring portion surrounding the grinding cavity 11, a plurality of shock absorption fixing holes 17 are provided on the base ring portion 16, a plurality of drive connection columns 18 are provided on the lower part of the grinding base 10, and the reduction motor 50 is fixedly connected to the drive connection columns 18 through a drive mounting seat 60.

[0083] Specifically, a powder discharge port 1101 is further formed on one side of the peripheral wall of the grinding chamber 11, and a powder discharge guide groove member 200 is provided corresponding to the powder discharge port 1101.

[0084] As Figure 5 、 6 shown, the driving mounting seat 60 includes a transmission through hole 61, and a driving connection groove 62 is arranged around one side of the transmission through hole 61. The driving connection groove 62 is sleeved on the outer periphery of the bearing seat hole 12 at the bottom of the grinding base 10; a driving connection hole 63 that cooperates with the driving connection column 18 is further provided on the driving mounting seat 60; a plurality of motor fixing buckle parts 64 and a motor fixing seat 65 are arranged on the other side of the transmission through hole 61, and a motor ring part 52 and a motor fixing hole 53 are arranged around the output shaft 51 on the reduction motor 50.

[0085] Specifically, the reduction motor 50 is integrally provided with a gear reduction box, the output shaft 51 is arranged on the gear reduction box, and the output shaft 51 passes through the transmission through hole 61 and then cooperates with the transmission shaft hole 41 at the bottom of the transmission shaft 40.

[0086] In the grinding device of the coffee machine according to the embodiment of the present invention, since the inner grinding knife is installed in the bearing seat hole in the grinding base by the transmission shaft and the bearing, and the outer grinding knife is arranged in the grinding chamber through the lifting ring seat, and the grinding base, the transmission shaft, the lifting ring seat, the inner grinding knife, and the outer grinding knife are all made of hard materials. When the inner grinding knife and the outer grinding knife grind and extrude each other, when the machining accuracy of the grinding base meets the requirements, there will be no deformation error in the coaxiality between the inner grinding knife and the outer grinding knife. In addition, since the output shaft of the reduction motor is movably connected to the transmission shaft, the output shaft will not affect the coaxiality between the transmission shaft, the inner grinding knife, and the outer grinding knife, greatly reducing the noise while ensuring that the inner grinding knife and the outer grinding knife can grind out coffee powder with uniform thickness.

[0087] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present invention, various changes, modifications, substitutions, and variations of these embodiments still fall within the protection scope of the present invention.

Claims

1. A grinding device for a coffee machine, characterized in that: It comprises a grinding base, a transmission shaft, a reduction motor, a grinding knife group sleeved on the transmission shaft, the grinding knife group is arranged in the grinding cavity of the grinding base, a bearing seat hole is arranged at the bottom of the grinding cavity, the transmission shaft is rotatably arranged in the bearing seat hole through a plurality of bearings, and the output shaft of the reduction motor is movably connected with the lower end of the transmission shaft; the grinding knife group comprises an outer grinding knife and an inner grinding knife, the outer grinding knife is annular and the inner grinding knife is arranged in the outer grinding knife, the outer grinding knife is arranged in the grinding cavity through a lifting and adjusting mechanism, the transmission shaft passes through the center hole of the inner grinding knife and drives the inner grinding knife to rotate in the outer grinding knife; The lifting and lowering adjustment mechanism includes a clamping plate, a knife supporting ring frame, and a lifting ring seat which are arranged in sequence. The fixed ring portion of the external grinding knife is arranged on the knife supporting ring frame. The clamping plate movably presses the external grinding knife on the knife supporting ring frame from the opening position of the grinding chamber. The knife supporting ring frame is arranged in the lifting ring seat. The lifting ring seat and the grinding base are both made of hard materials. The outer peripheral wall of the lifting ring seat fits with the inner peripheral wall of the grinding chamber of the grinding base and moves relative to each other.

2. The grinding device of the coffee machine according to claim 1, characterized in that: An adjusting transmission ring is provided corresponding to the adjusting external threaded portion of the outer peripheral wall of the lifting ring seat, and the adjusting transmission ring is provided in an adjusting rotating seat. The adjusting rotating seat is axially rotated and buckled on the upper end of the grinding base. An adjusting wheel is buckled from the opening position of the grinding chamber corresponding to the adjusting rotating seat, and the adjusting wheel drives the lifting ring seat to move in the grinding chamber, so that the gap between the inner grinding knife and the outer grinding knife changes accordingly.

3. The grinding device of the coffee machine according to claim 2, characterized in that: A plurality of radial guide pins are evenly arranged on the outer peripheral wall of the lifting ring seat along the circumferential direction, and lifting guide grooves are arranged on the inner shaft wall of the grinding chamber corresponding to the radial guide pins.

4. The grinding device of the coffee machine according to claim 2, characterized in that: The lower side of the lifting ring seat is correspondingly arranged on the lifting bearing ring in the grinding chamber, and a plurality of axial guide columns are arranged on the lower side of the knife support ring frame. Corresponding to the axial guide columns, corresponding axial guide holes are arranged on the support ring part of the lifting ring seat, and corresponding lifting guide holes are arranged on the lifting bearing ring corresponding to the axial guide holes. After the axial guide columns pass through the axial guide holes, they are axially positioned and matched with the lifting guide holes.

5. The grinding device of the coffee machine according to claim 2, characterized in that: The pressing plate is annular, a pressing platform is provided inside the pressing plate, a plurality of pressing buckle parts are provided at the lower edge of the pressing plate, a fixing ring part of the external grinding knife is provided on the pressing platform, and the pressing buckle part cooperates with the fixing ring part; The knife support ring frame is ring-shaped, a knife support ring portion is arranged on the inner side of the knife support ring frame, the fixing ring portion of the external grinding knife is arranged between the clamping platform portion and the knife support ring portion, a plurality of tightening groove portions are arranged on the outer peripheral wall of the clamping plate, and a plurality of tightening protrusion portions are arranged correspondingly on the inner peripheral wall of the knife support ring frame.

6. The grinding device of the coffee machine according to claim 5, characterized in that: The lifting ring seat comprises a supporting ring part matched with the bottom of the knife supporting ring frame, the supporting ring part is provided with a plurality of ring frame connecting holes, and a plurality of ring frame connecting columns are provided at the bottom of the knife supporting ring frame corresponding to the ring frame connecting holes; An adjusting external threaded portion is arranged on the outer circumference of the lifting ring seat which is higher than the opening of the grinding chamber, an adjusting transmission ring is sleeved on the adjusting external threaded portion, and an adjusting internal threaded portion which cooperates with the adjusting external threaded portion is arranged on the inner wall of the adjusting transmission ring.

7. The grinding device of the coffee machine according to claim 6, characterized in that: The adjusting rotating seat is also ring-shaped, a transmission ring fixing portion is arranged on the inner side of the adjusting rotating seat, the adjusting transmission ring is arranged on the transmission ring fixing portion, the adjusting transmission ring and the adjusting rotating seat are provided with first screw holes and second screw holes corresponding to each other, a plurality of adjusting buckle portions are arranged on the lower end of the adjusting rotating seat, and an adjusting buckle portion is arranged on the upper end of the grinding base corresponding to the adjusting buckle portions, so that the adjusting rotating seat is axially rotatably installed at the opening position of the grinding chamber; The adjusting wheel is provided with a feed port corresponding to the grinding chamber, and a plurality of vertical edges are provided along the circumferential direction on the inner wall connected with the feed port. The adjusting wheel is buckled on the adjusting rotating seat, and an adjusting tooth groove portion is provided on the outer peripheral wall of the adjusting rotating seat, and the vertical edges cooperate with the adjusting tooth groove portion.

8. The grinding device of the coffee machine according to claim 2, characterized in that: The grinding knife assembly further includes a powder scraper plate, which is sleeved in the transmission shaft and located at the bottom of the inner grinding knife. The powder scraper plate fits the bottom wall of the grinding chamber, and the powder scraper plate and the inner grinding knife rotate synchronously. The transmission shaft includes a transmission shaft hole arranged at the bottom, and a bearing stop, a shaft key portion and a threaded end portion are arranged in sequence along the length direction; the transmission shaft hole is movably connected to the output shaft of the reduction motor; the center of the scraper plate is arranged on the shaft key portion through a key hole, and the center hole of the inner grinding knife is sleeved between the shaft key portion and the threaded end portion, and a plurality of transmission pins are also arranged on the scraper plate around the key hole, and a transmission pin hole is arranged at the bottom of the inner grinding knife corresponding to the transmission pin.

9. The grinding device of the coffee machine according to claim 8, characterized in that: The upper part of the scraper plate is also provided with a plurality of radial scraper blocks axially inclined in the circumferential direction, the lower part of the scraper plate is provided with an inserting ring part around the key hole, a scraper ring groove is provided at the bottom of the grinding chamber corresponding to the inserting ring part, and a sealing ring groove is also provided at the bottom of the grinding chamber around the outer circumference of the scraper ring groove, and a wool ring is provided in the sealing ring groove; Alternatively, a plurality of circumferential scraping blocks are arranged on the radial outer peripheral edge of the scraper plate, and the circumferential scraping blocks cooperate with the bottom and side walls of the grinding chamber. An insert ring portion is arranged around the key hole at the lower part of the scraper plate, and a wool loop is also arranged between the insert ring portion and the bottom of the grinding chamber.

10. The grinding device of the coffee machine according to claim 8, characterized in that: The transmission shaft is arranged in the bearing seat hole in the grinding base through at least one group of bearings between the bearing stops; a retaining ring is also arranged on the lower side of the transmission shaft, and a group of bearings are arranged between the retaining ring and the bearing stop.

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