Grinding device

Abstract

The application provides a grinding device, which comprises a grinding shell, a discharge port arranged on one side of the grinding shell, a first grinding element and a second grinding element coaxially arranged in the grinding shell and forming a grinding gap between the first grinding element and the second grinding element, the second grinding element rotating relative to the first grinding element to grind raw materials to be ground in the grinding gap, a propelling wheel connected below the second grinding element to drive the second grinding element to rotate, the rotation of the propelling wheel being capable of pushing the ground raw materials from the grinding gap to the discharge port, a driving assembly arranged below the grinding shell and connected with the propelling wheel in a torque transmission mode, the bottom of the propelling wheel being provided with an input end extending in an axial direction, the grinding shell being provided with a through hole for the input end to pass through, the input end being supported on the grinding shell by a support, a sealing element being arranged between the propelling wheel and the grinding shell, the sealing element being adjacent to the radially outer side of the support and protruding towards the propelling wheel.

Description

[0001] This application is a divisional application of application number 202110948041.3, filed on August 18, 2021, entitled "Grinding Apparatus". Technical Field

[0002] This invention relates to a grinding apparatus, and more particularly to a grinding apparatus for grinding coffee beans. Background Technology

[0003] Coffee is a popular and fashionable beverage. The coffee processing usually involves grinding coffee beans into coffee powder, which is easily oxidized and loses its aroma. In order to fully preserve the aroma of coffee, automatic coffee machines that automatically grind coffee beans are becoming increasingly popular among ordinary consumers.

[0004] like Figure 1 As shown, existing coffee bean grinding devices generally include a motor 11, a gearbox 12, and a grinding assembly. The motor 11 outputs power to the grinding assembly through the gearbox 12. The grinding assembly includes an upper grinding blade 14 and a lower grinding blade 15 disposed within a coffee powder container 17. The lower grinding blade 15 receives the power output and rotates relative to the upper grinding blade 14 to grind the coffee beans between the upper grinding blade 14 and the lower grinding blade 15. The gearbox 12 includes planetary gears and a ball bearing holder 13. The ball bearing holder 13 forms a tight fit with the housing of the gearbox 12 through multiple externally rotating steel balls, thereby ensuring the coaxiality of the ball bearing holder 13 and the gearbox 12. A pusher 16 is disposed below the lower grinding blade 15, and the pusher 16 is fixed to the ball bearing holder 13 to allow the lower grinding blade 15, which is fixed on the pusher 16, to rotate more stably. The coffee powder container 17 is engaged with the gearbox 12, and the upper grinding blade 14 is engaged with the coffee powder container 17. Through a series of engagements, the concentricity of the upper grinding blade 14 and the lower grinding blade 15 is ensured, thereby ensuring the consistency of the grinding degree.

[0005] To ensure the coaxiality of the upper and lower grinding blades, the precision of all mating parts must be guaranteed. Large cumulative errors can compromise the coaxiality of the upper and lower grinding blades, leading to poor consistency in the grinding fineness of mass-produced coffee grinders. Furthermore, the large diameter of the ball bearing holder causes creep at its center when subjected to axial force (during grinding). This creep, as the lower grinding blade sinks, increases the distance between the upper and lower grinding blades, resulting in uneven grind particle size. Summary of the Invention

[0006] The purpose of this invention is to provide a grinding device with high assembly precision and more reliable use.

[0007] To achieve the above-mentioned objective, the present invention provides a grinding apparatus, comprising:

[0008] A grinding shell, one side of which is provided with a discharge port;

[0009] A first grinding element and a second grinding element are coaxially arranged in the grinding shell and form a grinding gap between the first grinding element and the second grinding element, and the second grinding element rotates relative to the first grinding element to grind the raw material to be ground in the grinding gap;

[0010] A propelling wheel is connected to the lower side of the second grinding element to drive the second grinding element to rotate, and the rotation of the propelling wheel can push the ground raw material from the grinding gap to the discharge port;

[0011] A driving assembly is arranged below the grinding shell, and the driving assembly is connected to the propelling wheel in a torque transmission manner;

[0012] The propelling wheel and the driving assembly comprise a torque connecting portion, the grinding shell has a through hole for the torque connecting portion to pass through, the torque connecting portion is radially supported on the grinding shell by a fixed support, a rolling support is arranged between the propelling wheel and the grinding shell, and the rolling support provides at least axial support for the propelling wheel.

[0013] As a further improvement of an embodiment of the present application, the fixed support is configured as a metal shaft sleeve, the bottom of the propelling wheel has an input end extending in the axial direction, the driving assembly comprises a torque output, the torque output is fixedly connected with the input end in a circumferential direction, and the input end is configured as the torque connecting portion.

[0014] As a further improvement of an embodiment of the present application, the rolling support is supported between the propelling wheel and the fixed support.

[0015] As a further improvement of an embodiment of the present application, the rolling support comprises a plurality of rolling balls, the bottom of the propelling wheel is provided with a first rolling groove, the fixed support is provided with a second rolling groove, and the plurality of rolling balls move along the first rolling groove and the second rolling groove.

[0016] As a further improvement of an embodiment of the present application, a sealing member is further arranged between the propelling wheel and the grinding shell, the sealing member is adjacent to the radially outer side of the fixed support and protrudes upward, so that the sealing member is in contact with the propelling wheel.

[0017] As a further improvement of an embodiment of the present application, the bottom of the propelling wheel is further provided with an annular groove, the annular groove is spaced from the rolling support, and the sealing member extends into the annular groove.

[0018] As a further improvement of the embodiment of the present application, the bottom of the grinding shell is provided with a first step portion and a second step portion which are sequentially sunken, the sealing member is installed on the first step portion, and the fixed support member is installed on the second step portion.

[0019] As a further improvement of the embodiment of the present application, the grinding shell has a bottom surface adjacent to the discharge port, the grinding shell includes a step portion which is sunken with respect to the bottom surface, and the fixed support member is installed on the step portion and is flush with the bottom surface.

[0020] As a further improvement of the embodiment of the present application, the rolling support member and the fixed support member are disposed on both sides of the through hole in the axial direction.

[0021] As a further improvement of the embodiment of the present application, the rolling support member is supported between the advancing wheel and the grinding shell, and the force receiving direction of the rolling support member is inclined in the axial direction.

[0022] As a further improvement of the embodiment of the present application, the through hole is provided with a first support portion and a second support portion at both ends in the axial direction, the rolling support member is supported between the first support portion and the advancing wheel, and the fixed support member is installed on the second support portion.

[0023] As a further improvement of the embodiment of the present application, the bottom of the advancing wheel has an input end which extends in the axial direction, a first curved surface is formed between the bottom surface of the advancing wheel and the outer circumferential surface of the input end, a second curved surface is formed on the first support portion, and the rolling support member is located between the first curved surface and the second curved surface.

[0024] As a further improvement of the embodiment of the present application, the drive assembly includes a torque output member which is fixed in the axial direction with respect to the advancing wheel and the second grinding element, and a limiting member is provided between the torque output member and the grinding shell, the limiting member fills the axial gap between the torque output member and the grinding shell to limit the upward displacement of the second grinding assembly in the axial direction.

[0025] As a further improvement of the embodiment of the present application, the limiting member is configured as a plain bearing, a rolling element, or a wave washer.

[0026] As a further improvement of the embodiment of the present application, the bottom of the grinding shell is provided with a sunken step portion, the fixed support member is installed on the inner side of the step portion, and the limiting member abuts between the torque output member and the outer side of the step portion.

[0027] As a further improvement of the embodiment of the present application, the through hole is provided with a supporting portion on the side facing the torque output member in the axial direction, the fixed supporting member is installed on the supporting portion, and the limiting member abuts between the torque output member and the fixed supporting member.

[0028] As a further improvement of the embodiment of the present application, the grinding shell comprises an extension wall extending downward along the outer periphery thereof, the drive assembly comprises a motor, a transmission mechanism driven by the motor, and a gear box accommodating the transmission mechanism, the motor is connected to one end of the gear box, the other end of the gear box is connected with the extension wall, the bottom of the grinding shell is provided with a sunken step portion, a cavity is formed between the extension wall and the outer side of the step portion, and a plurality of reinforcing rib plates are arranged in the cavity in a circumferential direction.

[0029] The grinding device provided by the present application has the following advantages: the radial support and the axial support of the propelling wheel driving the second grinding element are both supported on the grinding shell, the components in the grinding shell can be separated from the drive assembly, the number of parts in the size chain is reduced, the independent radial fixed supporting member is added, the cumulative error of the size is effectively reduced, the propelling wheel is directly matched with the grinding shell through the fixed supporting member, the coaxial precision of the second grinding element and the grinding shell is ensured, the axial rolling support can reduce the support span, the stress direction is downward, and the stress direction is consistent with that of the second grinding element, and the creep problem of the parts under stress is improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic diagram of a grinding device in the prior art;

[0031] Figure 2 is a structural schematic diagram of a grinding device in a preferred first embodiment of the present application;

[0032] Figure 3 is a perspective exploded schematic diagram of the grinding device in Figure 2 ;

[0033] Figure 4 is a sectional view schematic diagram of the grinding device in Figure 2 along the line A-A;

[0034] Figure 5 is a perspective schematic diagram of the grinding shell of the grinding device in Figure 2 ;

[0035] Figure 6 is another perspective schematic diagram of the grinding shell in Figure 5 ;

[0036] Figure 7 is a sectional view schematic diagram of a grinding device in a preferred second embodiment of the present application;

[0037] Figure 8 is Figure 7 a perspective view of a propelling wheel of the grinding device in

[0038] Figure 9 is Figure 7 a perspective view of a grinding housing of the grinding device in

[0039] Figure 10 is Figure 9 a perspective view of another view of the grinding housing in DETAILED DESCRIPTION

[0040] The application will be described in greater detail with reference to the accompanying drawings, in which specific embodiments of the application are shown. These embodiments are illustrative of the application and changes in structure, materials, or function per se will occur to persons skilled in the art to which the application pertains, and are included in the scope of the application.

[0041] It should be understood that spatially relative terms, such as "upper", "above", "lower", "below", and the like, are used for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms can be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0042] The grinding device in the embodiments of the application is described by taking an automatic coffee machine capable of grinding coffee beans as an example. Referring to Figures 2 to 6 shown, in the first preferred embodiment, the grinding device 200 comprises a grinding housing 20, and the grinding housing 20 is provided with a discharge port 21 on one side. The grinding housing 20 is internally provided with a first grinding element 31 and a second grinding element 32, and the two grinding elements are coaxially arranged in the grinding housing 20. The first grinding element 31 and the second grinding element 32 form a grinding gap therebetween, and the second grinding element 32 rotates relative to the first grinding element 31 to grind the raw material to be ground in the grinding gap. The grinding element here can be a flat-blade grinder or a conical-blade grinder, and the grinding of the coffee beans is completed by driving the second grinding element 32 to rotate. In addition, the first grinding element 31 is fixed in the circumferential direction relative to the grinding housing 20, and the position of the first grinding element 31 along the axial direction can be adjusted by an adjusting ring 33, so that the fineness of the ground coffee powder can be selected. When the first grinding element 31 is raised, the grinding gap is enlarged to make the ground coffee powder coarser; and when the first grinding element 31 is lowered, the grinding gap is reduced to make the ground coffee powder particles smaller.

[0043] The lower part of the second grinding element 32 is connected with a propelling wheel 34, which is used to drive the second grinding element 32 to rotate. In the embodiment, the upper surface of the propelling wheel 34 is provided with three positioning columns 341, and the lower part of the corresponding second grinding element 32 is provided with three positioning holes 321. The positioning columns 341 are inserted into the corresponding positioning holes 321 to fix the propelling wheel 34 and the second grinding element 32 in the circumferential direction, so that the propelling wheel 34 drives the second grinding element 32 to rotate. The rotation of the propelling wheel 34 is also used to push the ground raw materials in the grinding gap to the discharge port 21. Preferably, the propelling wheel 34 is provided with a plurality of discharge plates 342 in the circumferential direction, and the discharge plates 342 are located at the upper edge of the propelling wheel 34. The discharge plates 342 can be arranged in multiple, and are uniformly spaced along the circumferential direction of the propelling wheel 34. The ground raw materials in the grinding gap will fall to the edge of the propelling wheel 34, and the propelling wheel 34 drives the discharge plates 342 to rotate to push the ground raw materials to the discharge port 21.

[0044] Further, the lower part of the grinding shell 20 is provided with a driving assembly, which is connected with the propelling wheel 34 in torque transmission, so as to drive the propelling wheel 34 to rotate. The driving assembly includes a motor 40, a transmission mechanism 50 driven by the motor 40, and a gear box 51 accommodating the transmission mechanism 50. The motor 40 is connected to one end of the gear box 51, and the transmission mechanism 50 is preferably a planetary gear deceleration mechanism, but can also be other transmission mechanisms, as long as it can transmit the torque output by the motor 40 to the propelling wheel 34. In the embodiment, the rotating shaft of the motor 40 is arranged coaxially with the rotating shaft of the second grinding element 32. In other implementable modes, the rotating shaft of the motor 40 can also be arranged parallel or perpendicular to the second grinding element. The propelling wheel 34 and the driving assembly include a torque connecting part, and the grinding shell 20 has a through hole 22 for the torque connecting part to pass through. The torque connecting part is radially supported on the grinding shell 20 by a fixed support 36, and the propelling wheel 34 and the grinding shell 20 are provided with a rolling support 37, which provides at least axial support for the propelling wheel 34.

[0045] By associating the radial support of the propelling wheel 34 and the torque connection of the driving assembly and the axial support of the propelling wheel 34 with the grinding shell 20, the number of matching parts in the size chain is reduced, and the cumulative error is effectively reduced. The propelling wheel 34 is radially supported on the grinding shell 20 through the fixed support 36, which ensures the coaxiality of the grinding shell 20 and the second grinding element 32 and ensures the consistency of the grinding degree of the mass-produced grinding device. In addition, the axial support reduces the span of the rolling support 37, and the radial fixed support 36 is provided, and since the rotational speed of the second grinding element 32 itself is low, the friction between the second grinding element 32 and the fixed support 36 can be ignored. On the premise of ensuring the stable rotation of the second grinding element 32, the coaxiality is better improved and the cost is reduced. The support direction of the rolling support 37 is consistent with the stress direction of the second grinding element 32, which can reduce the span of the rolling support and also can improve the problem of part stress creep.

[0046] With reference to the foregoing Figure 3 and Figure 4 , the fixed support 36 is configured as a metal shaft sleeve, the bottom of the propelling wheel 34 has an input end 344 extending in the axial direction, the driving assembly includes a torque output 52 connected to the output end of the transmission mechanism 50, and the torque output 52 is fixedly connected with the input end 344 in the circumferential direction. Preferably, the torque output 52 is inserted into the input end 344 for connection, that is, the input end 344 is configured as a torque connection part. The fixed support 36 is in direct contact with the input end 344, so that the support of the propelling wheel 34 is more stable. The metal shaft sleeve has high dimensional accuracy, and the error generated thereby can be ignored, so as to ensure the coaxiality of the second grinding element 32 and the grinding shell 20.

[0047] In the embodiment, the rolling support 37 is supported between the propelling wheel 34 and the fixed support 36. When the propelling wheel 34 drives the second grinding element 32 to rotate, the rolling support 37 can reduce the friction between the propelling wheel 34 and the fixed support 36, and the propelling wheel 34 can use more kinetic energy for grinding coffee beans. At the same time, by directly contacting the fixed support 36 and the rolling support 37, the manufacture of the grinding shell 20 only needs to control the size at the matching part of the fixed support 36 to ensure the coaxiality of the propelling wheel 34 and the grinding shell 20, thereby reducing the manufacturing cost of the grinding device.

[0048] Specifically, the rolling support 37 comprises a plurality of rolling balls, the bottom of the pushing wheel 34 is provided with a first rolling groove 347, the fixed support 36 is provided with a second rolling groove 361, and the plurality of rolling balls move along the first rolling groove 347 and the second rolling groove 361. The rotation of the pushing wheel 34 is supported by the plurality of rolling balls, so that the overall torque transmission is more stable. In addition, the rolling grooves are directly arranged on the pushing wheel 34 and the fixed support 36, which can reduce the size of the axial cooperation between the pushing wheel 34 and the grinding shell 20, so that the overall structure of the grinding device is more compact, and the lower surface of the pushing wheel 34 is used as part of the rolling bearing, which can effectively reduce the parts under the premise of meeting the function.

[0049] In addition, in order to make the fixed support 36 more stably support the pushing wheel 34, the length of the fixed support 36 in the axial direction is between one half and three quarters of the length of the output end 344 in the axial direction. In this way, in order to reduce the overall axial size of the grinding device, the depth of the first rolling groove 347 can be set to be greater than the radius of the rolling member, which can reduce the axial size of the grinding shell while ensuring the radial support span of the fixed support 36.

[0050] During the grinding process of the coffee beans, in order to prevent the coffee powder from entering the torque connection part, i.e. the area of the moving parts, from the gap between the pushing wheel 34 and the grinding shell 20, a sealing member 38 can be arranged between the pushing wheel 34 and the grinding shell 20. The sealing member 38 is configured as a felt ring, which has good sealing effect and can effectively prevent the entry of coffee powder. Preferably, the sealing member 38 is adjacent to the radially outer side of the fixed support 36 and protrudes upward, and the upward protrusion is to make the sealing member 38 contact the pushing wheel 34. In this way, the sealing member 38 blocks the coffee powder from entering the transmission area, and also blocks the lubricating oil or friction debris in the transmission area from entering the coffee powder conveying area in the grinding shell. The fixed support 36 can also assist in positioning the sealing member 38 to ensure the reliable use of the grinding device. Preferably, the bottom of the pushing wheel 34 is also provided with an annular groove 348, which is spaced from the first rolling groove 347, and the sealing member 38 extends into the annular groove 348. In this way, the coffee powder needs to go through an upward process to enter the transmission area, which can better block the entry of coffee powder.

[0051] To facilitate the installation of the fixing support 36, the grinding housing 20 has a bottom surface 23 near the discharge port. The grinding housing 20 includes a stepped portion that is recessed relative to the bottom surface 23. The fixing support 36 is installed on the stepped portion and is flush with the bottom surface 23, which facilitates the control of the gap between the push wheel 34 and the grinding housing 20. The sealing member 38 can be radially spaced from the fixing support 36 or radially abutted. Preferably, the stepped portion includes a first stepped portion 24 and a second stepped portion 25 that are sequentially recessed along the bottom of the grinding housing 20. The sealing member 38 is installed on the first stepped portion 24, and the fixing support 36 is installed on the second stepped portion 25. The fixing support 38 also limits the position of the sealing member 38, which facilitates the manufacturing of the grinding housing and the assembly of the grinding device.

[0052] In the above embodiment, the propulsion wheel 34 is rotatably supported within the grinding housing 20 and cooperates with the drive assembly outside the grinding housing 20. The drive assembly includes a torque output component 52, which is axially fixed to the propulsion wheel 34 and the second grinding element 32. The second grinding element 32, the propulsion wheel 34, and the torque output component 52 can be connected from top to bottom by screws 523 to achieve axial fixation of the three components. Additionally, a spiral guide component 322 can be provided above the second grinding element 32 to guide coffee beans into the grinding gap between the first grinding element 31 and the second grinding element 32. The propulsion wheel 34 extends upwards with a protrusion 345, which inserts into the second grinding element 32 and connects with the spiral guide component 322 to transmit torque. The screw 523 can pass through the spiral guide component 322, which abuts against the upper surface of the second grinding element 32. Thus, the spiral guide component 322, the second grinding element 32, the propulsion wheel 34, and the torque output component 52 are axially fixed by the screw 523. The propulsion wheel 34 and the torque output component 52 are connected by a spline. The torque output component 52 can be inserted into the propulsion wheel 34, or the propulsion wheel 34 can be inserted into the torque output component 52. In the above embodiment, it is preferred that the torque output component 52 is inserted into the propulsion wheel 34. The radial and axial support acts directly on the propulsion wheel 34 to make the rotation of the propulsion wheel 34 more stable.

[0053] In order to prevent the second grinding element 32 from moving upward during the grinding process, especially during the idling, a limiting member 61 is arranged between the torque output 52 and the grinding housing 20, which fills the axial gap between the torque output 52 and the grinding housing 20 to limit the axial upward displacement of the second grinding element 32. By locking the position between the torque output 52 and the grinding housing 20, the axial position of the second grinding element 32 is ensured. The limiting member 61 can be configured as a flat bearing or a wave washer, or of course a plurality of rolling elements arranged between the torque output 52 and the grinding housing 20. The torque output 52 and the propelling wheel 34 are fixed together by the screw 523, and the second grinding element 32 has no axial movement space. The flat bearing or the rolling elements can reduce the friction during the rotation of the torque output 52. The wave washer can always keep the propelling wheel 34 downward by the torque output 52, so that the second grinding element 32 will not move upward to collide with the first grinding element 31 during the grinding process, especially during the idling.

[0054] Specifically, the second stepped portion 25 has an inner side on which the fixed support 36 is mounted and an outer side facing the driving assembly. The limiting member 61 abuts between the torque output 52 and the outer side of the second stepped portion 25. The second grinding element 32 is fixed to the torque output 52 by the screw 523, and the limiting member 61 limits the gap between the torque output 52 and the grinding housing 20 to define the axial position of the second grinding element 32 relative to the grinding housing 20. The overall assembly is very convenient, and the structure is more reliable.

[0055] Further, in order to facilitate the overall assembly of the grinding device, the grinding housing 20 includes an extension wall 29 extending downward along the outer periphery thereof. The motor 40 is connected to one end of the gear box 51, and the other end of the gear box 51 is connected to the extension wall 29. The torque output 52 is connected to the output end of the transmission mechanism in a torque-transmitting manner, such as by spline connection. During assembly, the driving assembly can be connected to the grinding housing 20 as a whole. The components in the grinding housing 20 are connected based on the grinding housing 20 as a reference, and the cumulative error is small, and the assembly precision is high. The outer side of the stepped portion at the bottom of the grinding housing 20 and the extension wall 29 form a cavity, and a plurality of reinforcing ribs 291 are arranged in the cavity in a circumferential direction to further enhance the overall strength of the grinding housing 20.

[0056] Reference Figures 7 to 10As shown, it is the second preferred embodiment of the grinding device of the present application, in this embodiment, the same reference numerals are used for the same components as in the first embodiment, and the structure and function are the same as in the first embodiment, which will not be repeated here. The difference is that the rolling support 37a and the fixed support 36a are arranged axially on both sides of the through hole 22, that is, the rolling support 37a and the fixed support 36a are both supported between the advancing wheel 34 and the grinding shell 20. By separating the axial support and the radial support, the cooperation of the two support points, the axial support of the rolling support 37a bears the downward pressure during grinding, reducing the friction between the advancing wheel 34 and the grinding shell 20. The radial fixed support 36a cooperates with the advancing wheel 34 and the grinding shell 20, greatly improving the coaxial accuracy. In this embodiment, the force direction of the rolling support 37a is arranged obliquely to the axial direction, that is, the force angle of the rolling support 37a is at a preset angle with the rotation axis of the advancing wheel 34, which not only ensures the coaxiality of the advancing wheel 34 and the grinding shell 20, but also bears the downward pressure during grinding, which can further improve the coaxial accuracy. By forming two-point radial support, the axial length of the fixed support 36a can be reduced while ensuring the support span, so that the axial length of the fixed support 36a can be less than half of the axial length of the input end 344 of the advancing wheel 34, preferably between one fourth and one half of the axial length of the input end 344, thereby reducing the overall height of the grinding shell.

[0057] Specifically, the through hole 22 has a first support portion 26 and a second support portion 27 at both axial ends, the rolling support 37a is supported between the first support portion 26 and the advancing wheel 34, and the fixed support 36a is installed on the second support portion 27. The first support portion 26 and the second support portion 27 can be configured as stepped portions on both sides of the through hole 22, facilitating the manufacture of the grinding shell 20. The bottom of the advancing wheel 34 has an input end 344 extending axially, a first arc surface 346 is formed between the bottom plane of the advancing wheel 34 and the outer peripheral surface of the input end 344, a second arc surface 263 is formed on the first support portion 26, and the rolling support 37a is located between the first arc surface 346 and the second arc surface 263, that is, the first arc surface 346 and the second arc surface 263 constitute the movement track of the rolling support 37a. By adjusting the position of the arc surface, the force angle of the rolling support 37a can be adjusted, which is preferably 45 degrees in this embodiment, facilitating the manufacture and making the rotation support of the advancing wheel 34 more stable. In addition, in order to prolong the service life of the advancing wheel 34, a raised stepped surface can be provided radially from the outside to the inside of the bottom of the advancing wheel 34, so that the first arc surface 346 can be arranged on the higher stepped surface, which does not affect the normal operation even if it is worn out after long-term use.

[0058] In the embodiment, in order to prevent the coffee powder from entering the torque connection part, i.e. the area of the moving part, from the gap between the propelling wheel 34 and the grinding shell 20, a sealing piece 38a can also be arranged between the propelling wheel 34 and the grinding shell 20. The mounting groove 28 in the shape of a ring is arranged on the grinding shell 20 and spaced from the first support part 26, the sealing piece 38a can be inserted into the mounting groove 28 and the upper part of the sealing piece 38a abuts against the bottom surface of the propelling wheel 34, so that the sealing piece 38a blocks the coffee powder from entering the transmission area. In order to prevent the propelling wheel 34 from floating up and causing the sealing failure in the case that the coffee powder is accumulated too much, an elastic element can be arranged at the bottom of the sealing piece 38a, the sealing piece 38a is kept in the tendency of abutting against the propelling wheel 34 upward under the action of the elastic element, even if the propelling wheel 34 floats up, the sealing piece 38a can keep close contact with the propelling wheel 34, thereby enhancing the sealing effect.

[0059] In the embodiment, in order to prevent the second grinding element 32 from moving upward and colliding with the first grinding element 31, a limiting piece 61 can be arranged to abut between the torque output part 52 and the fixed support part 36a. In this way, the limiting piece 61 can also realize the axial limiting of the fixed support part 36a, thereby improving the reliability of the overall structure. As in the first embodiment, the driving assembly as a whole is connected with the grinding shell 20, in the process of grinding, the motor 40 outputs power to the torque output part 52 through the transmission mechanism 50, so that the torque output part 52 starts to rotate, the torque output part 52 is fixed with the propelling wheel 34 and the second grinding element 32, so the second grinding element 32 starts to rotate together; at this time, the fixed support part 36a cooperates with the propelling wheel 34 to ensure the stability of the rotation of the second grinding element 32, and the rolling support part 37a and the limiting piece 61 rotate irregularly in this process, thereby reducing the friction between the propelling wheel 34 and the grinding shell and between the torque output part 62 and the grinding shell.

[0060] In the above embodiment, the radial support and the axial support of the propelling wheel driving the second grinding element are supported on the grinding shell, the components in the grinding shell can be separated from the driving assembly, thereby reducing the number of parts in the size chain and increasing the independent radial fixed support part to reduce the size error. The propelling wheel is directly cooperated with the grinding shell through the fixed support part, thereby ensuring the coaxial precision of the second grinding element and the grinding shell. At the same time, the axial rolling support can reduce the support span and the stress direction is downward, which is consistent with the stress direction of the second grinding element, thereby improving the problem of part creep under stress.

[0061] It should be understood that although the present specification describes only a single embodiment, the disclosure of features or combinations of features in this specification is not to be construed as an exhaustive list. The various features described or referenced in this specification can be combined in any combination. Each embodiment of the present specification can be implemented in a variety of ways.

[0062] The above detailed description of a series of specific embodiments of the present application is merely intended to illustrate the feasibility of the present application, and is not intended to limit the protection scope of the present application. Any equivalent embodiments or changes made without departing from the spirit of the present application shall be included in the protection scope of the present application.

Claims

1. A grinding apparatus, comprising: A grinding housing, wherein a discharge port is provided on one side of the grinding housing; The first grinding element and the second grinding element are coaxially disposed in the grinding housing and a grinding gap is formed between the first grinding element and the second grinding element. The second grinding element can rotate relative to the first grinding element to grind the raw material to be ground in the grinding gap. A push wheel is connected below the second grinding element to drive the second grinding element to rotate. The rotation of the push wheel can push the crushed raw material from the grinding gap to the discharge port. A drive assembly is disposed below the grinding housing, and the drive assembly is connected to the propulsion wheel in a torque-transmitting manner; The feature is that the bottom of the propulsion wheel has an axially extending input end, the grinding housing has a through hole for the input end to pass through, the input end is supported on the grinding housing by a support member, and a sealing member is provided between the propulsion wheel and the grinding housing, the sealing member being adjacent to the radially outer side of the support member and protruding towards the propulsion wheel; the support member is configured as follows: The support includes a rolling element, which is supported between the propulsion wheel and the grinding housing. The force direction of the rolling element is inclined to the axial direction.

2. The grinding apparatus according to claim 1, characterized in that, An elastic element is provided at the bottom of the seal, and the seal tends to press against the propulsion wheel upward under the action of the elastic element.

3. The grinding apparatus according to claim 1, characterized in that, The seal and the rolling element are radially spaced apart by the propulsion wheel or the grinding housing.

4. The grinding apparatus according to claim 1, characterized in that, The support also includes a bushing, and the rolling element and the bushing are axially spaced on both sides of the through hole.

5. The grinding apparatus according to claim 4, characterized in that, The through hole is provided with a first support and a second support at both ends along the axial direction, the rolling element is supported between the first support and the propulsion wheel, and the bushing is installed on the second support.

6. A grinding apparatus, comprising: A grinding housing, wherein a discharge port is provided on one side of the grinding housing; The first grinding element and the second grinding element are coaxially disposed in the grinding housing and a grinding gap is formed between the first grinding element and the second grinding element. The second grinding element can rotate relative to the first grinding element to grind the raw material to be ground in the grinding gap. A push wheel is connected below the second grinding element to drive the second grinding element to rotate. The rotation of the push wheel can push the crushed raw material from the grinding gap to the discharge port. A drive assembly is disposed below the grinding housing, and the drive assembly is connected to the propulsion wheel in a torque-transmitting manner; The feature is that the bottom of the propulsion wheel has an axially extending input end, the grinding housing has a through hole for the input end to pass through, the input end is supported on the grinding housing by a support member, and a sealing member is provided between the propulsion wheel and the grinding housing, the sealing member protruding towards the propulsion wheel such that the upper part of the sealing member contacts the bottom of the propulsion wheel and the lower part of the sealing member contacts the grinding housing; the support member is configured as follows: The support includes a rolling element, which is supported between the propulsion wheel and the grinding housing. The force direction of the rolling element is inclined to the axial direction.

7. The grinding apparatus according to claim 6, characterized in that, The support member includes a bushing that provides radial support and a rolling element that provides axial support. The seal and the rolling element are radially spaced apart by the propulsion wheel or the grinding housing.

8. The grinding apparatus according to claim 7, characterized in that, The bushing is limited by the grinding housing, and the seal is limited by the bushing and the grinding housing.

9. The grinding apparatus according to claim 7, characterized in that, The seal and the rolling element are separated by the grinding housing, and the rolling element and the bushing are axially spaced on both sides of the through hole.

Images