High-precision externally adjustable coffee mill

Abstract

Provided is a high-precision externally adjustable coffee mill with improved adjustment accuracy of the coffee mill. 【Solution means】It includes a main body housing 1, a grinding assembly, and a roughness adjustment structure. The roughness adjustment structure includes an outer adjustment ring 2-1, an inner drive ring 21, and a transmission gear 22. The outer adjustment ring rotates around the main body housing in a sleeve manner. The outer adjustment ring includes an internal gear ring, and the inner drive ring includes an external gear ring. The outer adjustment ring meshes with the inner drive ring through a transmission gear, and the outer adjustment ring drives the rotation of the inner drive ring to drive the adjustment of the grinding disk gap by a lifting rod. By increasing the rotation speed of the inner drive ring, the adjustment accuracy of the adjustment structure is greatly improved, and while maintaining the advantages of the convenience of adjustment of the externally adjustable coffee mill and the clarity of the scale display of the coffee mill with a single adjustment ring, the adjustment accuracy of the coffee mill is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coffee mill devices, and more specifically to a high-precision externally adjustable coffee mill.

Background Art

[0002] Currently, as a basic function of an electric coffee mill, there is a coffee powder coarseness adjustment function that enables users to adjust the coarseness of coffee powder to brew different types of coffee such as espresso, mocha, hand drip, and French press. Currently, the adjustment structures of commercially available electric coffee mills generally include two forms. The first is to provide one adjustment ring on the coffee mill body for convenient adjustment. According to the screw principle, the adjustment ring directly drives the up and down movement of the driving member to adjust the gap of the grinding disc. Since the adjustment range of the gap of the grinding disc of the coffee mill is narrow, usually within 2 mm, a single adjustment ring is adopted, the rotation angle range of the driving member is limited, and the adjustment accuracy is low. The second is to improve the adjustment accuracy by using a plurality of adjustment rings. However, for such an adjustment device, since it is adjusted by a plurality of adjustment rings, when the user determines the adjustment stage, not only the rotation scale on the adjustment ring but also the number of rotations of the adjustment ring must be taken into account, and there is a problem that it is very easy to get confused during use.

[0003] Also, in the market, as electric coffee mills for adjusting the coarseness of powder, two types, namely a lower-adjustment type coffee mill and an upper-adjustment type coffee mill, are common. In the lower-adjustment type coffee mill, the position of the movable cutter is adjusted by the rotation of an adjustment knob screwed to the mounting shaft, and the adjustment knob is provided at the lower end of the movable cutter, and there is a problem that it is difficult to use in the coarseness adjustment operation.

[0004] In order to overcome the problems existing in the above-mentioned lower-adjustable coffee mill, the upper-adjustable coffee mill developed in the prior art is provided with an upper-adjusting knob. The adjusting knob is screwed to the housing, the adjusting knob abuts against the motor mounting bracket, and by turning the adjusting knob, the up-and-down movement of the motor mounting bracket and the movable cutter connected thereto is driven. It solves the technical drawback that the adjustment operation of the lower-adjustable coffee mill is inconvenient. However, since the adjusting knob needs to drive the up-and-down movement of the motor simultaneously during adjustment, it is necessary to make the motor mounting bracket a movable structure. When the motor moves together with the grinding disc, the movement of the motor causes fatigue and gradual position shift of the adjustment structure, affecting the stability of the fineness of the ground coffee powder.

[0005] To solve at least one of the above problems, the present invention provides a novel coffee mill adjustment structure.

Summary of the Invention

[0006] This application is filed based on Chinese patent applications with application numbers 2024206178401, filing date March 27, 2024; 2024210477637, filing date May 14, 2024; 2024210469490, filing date May 14, 2024; 202421235040X, filing date May 31, 2024; and 2024212354947, filing date May 31, 2024, and claims the priority of the Chinese patent applications. The entire content of the above Chinese patent applications is hereby incorporated by reference into this application.

[0007] In a first aspect, one of the objects of the present invention is to provide a high-precision externally adjustable coffee mill that improves the accuracy of adjusting the particle size under the adjustment by a single adjustment ring. Compared with the adjustment of a coffee mill by a single adjustment ring in the prior art, the outer adjustment ring of the present invention has more adjustment steps. While maintaining the advantages of the convenience of adjusting the outer adjustable coffee mill and the clarity of the scale display of the single-adjustment-ring coffee mill, the problem of low adjustment accuracy of the single-adjustment-ring coffee mill in the prior art is overcome.

[0008] The present invention is a high-precision externally adjustable coffee mill including a main body housing, a grinding assembly for adjusting the grinding gap of the grinding assembly, and a roughness adjustment structure including an inner grinding disk and an outer grinding disk, wherein the roughness adjustment structure rotates relative to the main body housing, an outer adjustment ring including an internal gear ring, and an inner drive ring provided coaxially with the outer adjustment ring and including an external gear ring, and a transmission gear enabling the internal gear ring of the outer adjustment ring to mesh with the external gear ring of the inner drive ring, and a lifting rod enabling the inner drive ring to drive the lifting of the inner grinding disk or the outer grinding disk of the grinding assembly to adjust the gap, and provides a high-precision externally adjustable coffee mill.

[0009] In one embodiment, the reduction ratio of the outer adjustment ring to the inner drive ring is 1:1.4 or less.

[0010] In one embodiment, the reduction ratio of the outer adjustment ring to the inner drive ring is 1:1.6 or less.

[0011] In one embodiment, the reduction ratio of the outer adjustment ring to the inner drive ring is 1:3 or more and 1:1.6 or less.

[0012] In one embodiment, the outer adjustment ring is provided to be fitted with the main body housing, adjustment scales are distributed in the circumferential direction, a mounting bracket is provided in the main body housing, a rolling groove is provided in the outer adjustment ring, and a first ball plunger assembly that is rollably fitted with the rolling groove is provided on the mounting bracket.

[0013] In one embodiment, the mounting bracket is further provided with a second ball plunger assembly that is fitted with the internal gear ring or stepped groove of the outer adjustment ring, and the stepped groove is composed of a plurality of arc-shaped grooves arranged in the circumferential direction.

[0014] In one embodiment, the polishing assembly includes an outer polishing disc and an inner polishing disc sleeved with each other, the lifting rod is a driving sleeve rod for driving the axial movement of the outer polishing disc or the inner polishing disc, a mounting bracket is provided in the main body housing, the driving sleeve rod is slidably provided with respect to the mounting bracket, rotation is restricted within the main body housing, the driving sleeve rod is screw-connected to the inner driving ring, and when the outer adjustment ring drives the rotation of the inner driving ring, the driving sleeve rod is driven to move up and down in the axial direction.

[0015] In one embodiment, a driving motor is fixed to the mounting bracket, a connecting shaft is provided on the inner polishing disc, the output end of the driving motor is connected to the connecting shaft, the driving motor drives the rotation of the connecting shaft, a polishing disc bracket is provided in the main body housing, the connecting shaft is sleeved with the polishing disc bracket and is slidably provided in the axial direction with respect to the output end of the driving motor, and one end of the driving sleeve rod is fixedly connected to the connecting shaft in the axial direction.

[0016] In one embodiment, a biasing spring is mounted between the inner polishing disc and the connecting shaft, a flange is provided at the lower part of the connecting shaft, and the lower end surface of the flange, the upper end surface of the inner polishing disc and the biasing spring are in contact with each other.

[0017] In one embodiment, the drive sleeve rod includes a connection seat, is connected to the connection shaft through the connection seat, a first bearing is provided on the connection seat, the connection shaft is rotatably sleeved in the first bearing, a concave groove with a circlip fitted on the outer wall of the connection shaft is provided, the circlip abuts against the upper end surface of the first bearing of the drive sleeve rod, a biasing spring is sleeved on the connection shaft, one end of the biasing spring abuts against the inner polishing disc, the other end abuts against the polishing disc bracket, and the biasing spring applies a downward biasing force to the connection shaft.

[0018] In one embodiment, a drive motor mounting cavity is provided in the drive sleeve rod, the drive motor is fixed in the drive motor mounting cavity of the drive sleeve rod, a connection shaft is provided on the inner polishing disc, the output end of the drive motor is fixedly connected to the connection shaft to drive the rotation of the connection shaft.

[0019] In one embodiment, the outer adjustment ring is rotatably connected to a mounting bracket provided with a gear seat, and the transmission gear is rotatably provided relative to the gear seat.

[0020] In one embodiment, a rolling groove is provided in the outer adjustment ring, a first ball plunger assembly that is rollably fitted with the rolling groove is provided on the mounting bracket, and a second ball plunger assembly that is fitted with the internal gear ring of the outer adjustment ring is further provided on the mounting bracket.

[0021] In one embodiment, a second ball plunger assembly that is fitted with the stepped groove of the outer adjustment ring is further provided on the mounting bracket, and the stepped groove is composed of a plurality of arc-shaped grooves arranged in the circumferential direction.

[0022] In one embodiment, a mounting bracket and a polishing disc bracket are provided in the main body housing. The mounting bracket and the polishing disc bracket are integrally formed respectively. The mounting bracket is fixedly connected to the polishing disc bracket. The driving sleeve rod is provided in the mounting bracket so as to be axially slidable therein. The polishing disc bracket includes an outer polishing disc mounting hole and a connecting shaft mounting hole. Two second bearings coaxially provided are provided in the connecting shaft mounting hole. The connecting shaft is provided so as to pass through the second bearings.

[0023] In a second aspect, one object of the present invention is to provide an electric coffee mill with a simple structure, high use stability, improved adjustment accuracy, and enhanced market competitiveness.

[0024] The motor is fixed in the main body housing. The adjustment knob is provided at the upper end of the main body housing. The rotational motion is converted into the lifting motion of the lifting rod by the linkage assembly. The first polishing disc is moved and adjusted by the lifting rod. The adjustment structure skips the motor, avoiding the zero shift of the polishing disc caused by the long-term use of the motor. Furthermore, the adjustment operation of the polishing disc becomes easy and the stability during the operation of the coffee mill is also considered. Also, the errors accumulated in all aspects are eliminated by the adjustment. Both the motor and the adjustment knob are provided on the main body housing.

[0025] The electric coffee mill includes a main body housing, a drive motor fixed to the main body housing, a connecting shaft slidably connected to the output shaft of the drive motor in the axial direction, and an inner grinding disc connected to the connecting shaft. An outer grinding disc for fitting with the inner grinding disc and performing grinding is further provided in the main body housing. An adjustment knob is rotatably connected to the upper end of the main body housing. A bean feeding passage through which beans pass is formed between the inner wall of the main body housing and the motor. An opening communicating with the bean feeding passage is provided at the upper end or side end of the main body housing. A lifting rod is provided in the main body housing. One end of the lifting rod is fitted with the adjustment knob through an interlocking assembly, and the other end is connected to the connecting shaft. The adjustment knob drives the up and down movement of the lifting rod relative to the main body housing through the interlocking assembly. When the lifting rod moves up and down, the gap between the inner grinding disc and the outer grinding disc changes. When an opening is made in the main body housing and a bean feeding passage is formed on the inner wall of the main body housing, the internal space of the main body housing can be reasonably utilized to form a bean storage space, eliminating the need to separately provide a bean storage space in the main body. As a result, the overall volume of the coffee mill is reduced, and the structure is simplified. Furthermore, since the opening is provided at the upper part of the main body housing, with such a design, beans can be directly fed from the top, making it more portable in use and conforming to ergonomics and user habits.

[0026] In one embodiment, a screw is provided on the lifting rod. The interlocking assembly includes an inner drive ring screwed to the lifting rod. When the adjustment knob drives the rotation of the inner drive ring, it drives the movement of the lifting rod in the axial direction. By controlling the lifting of the lifting rod through several turns of the screw, the adjustment knob can set more adjustment steps, significantly improving the adjustment accuracy.

[0027] In one embodiment, the adjustment knob is fixed to the inner drive ring. The inner drive ring is screwed to the lifting rod. A through hole axially opened is provided on the lifting rod. The lifting rod is coaxially sleeved outside the motor. The motor is fixedly connected to the inside of the main body housing through a mounting seat. An avoidance groove through which the mounting seat passes is opened on the lifting rod.

[0028] In one embodiment, an internal gear ring is provided on the adjusting knob, an external gear ring is provided on the inner drive ring, the interlocking assembly further includes a transmission gear that meshes with the adjusting knob and the inner drive ring, the transmission gear is a reduction gear, and the internal gear ring meshes with the external gear ring through the transmission gear.

[0029] In one embodiment, a zero adjustment nut provided for indicating the height position of the lifting rod is provided at the upper end of the lifting rod.

[0030] In one embodiment, a conical surface that fits with the opening is formed at the upper end of the zero adjustment nut, and the conical surface is a guide slope for guiding the beans into the bean feeding passage.

[0031] In one embodiment, the adjusting knob is provided with adjustment scale indications that are circumferentially distributed at 300° to 360°.

[0032] In one embodiment, the lifting rod includes a connection seat, and a first bearing for rotatably sleeving on the connection shaft is provided on the connection seat.

[0033] In one embodiment, a polishing disk bracket is provided in the main body housing, a lower seat is provided at the lower end of the polishing disk bracket, a receiving groove for vertically restricting the outer polishing disk is formed between the polishing disk bracket and the lower seat, a stabilizing bracket provided below the connection seat of the lifting rod is further provided in the main body housing, the connection shaft is sleeved in the stabilizing bracket, a second bearing is provided on the stabilizing bracket, the connection shaft is provided slidably with respect to the second bearing, and the polishing disk bracket and the stabilizing bracket are integrally formed.

[0034] In one embodiment, a powder discharge guide baffle ring is provided on the lower seat. The inner surface of the powder discharge guide baffle ring is an arc surface that expands radially from top to bottom. An attachment concave groove for connecting to a powder receiving box is provided on the lower end surface of the lower seat, and the attachment concave groove is located at a position higher than the powder discharge guide baffle ring.

[0035] In one embodiment, a biasing spring is attached between the inner polishing disk and the connecting shaft. A flange is provided at the lower part of the connecting shaft, and the upper end surface of the flange, the upper end surface of the inner polishing disk, and the biasing spring are in contact with each other.

[0036] In a third aspect, one of the objects of the present invention is to provide a coffee mill polishing disk bracket and a coffee mill using the polishing disk bracket, which have high concentricity of the polishing disk assembly and uniform polishing roughness.

[0037] The polishing disk bracket is integrally formed. The polishing disk bracket is provided with an outer polishing disk mounting hole and a connecting shaft mounting hole, and the connecting shaft mounting hole includes at least one bearing mounting position. By integrally forming the polishing disk bracket, the corresponding bracket portions of the connecting shaft mounting hole and the outer polishing disk mounting hole do not need to be reassembled, and the assembly error between the two is reduced.

[0038] In one embodiment, the polishing disk bracket is made of metal or an alloy material, and the alloy material includes an aluminum alloy. The metal material can exert a good supporting effect and increase the strength of the entire polishing disk bracket. Here, the alloy material has high manufacturing accuracy and can be repeatedly processed to ensure the accuracy of the polishing disk bracket, effectively avoiding the disadvantages of deformation during injection molding and demolding of the injection molding member, further increasing the concentricity of the connecting shaft mounting hole and the outer polishing disk mounting hole, and realizing the weight reduction of the polishing disk bracket.

[0039] In one embodiment, the hole wall of the bearing mounting position and the hole wall of the connecting shaft mounting hole are provided in a continuous straight line.

[0040] In one embodiment, the bearing mounting positions include a first bearing mounting position and a second bearing mounting position. The second bearing is mounted at both the first bearing mounting position and the second bearing mounting position, and a positioning ring is provided between the two second bearings.

[0041] In one embodiment, one side of the outer polishing disk mounting hole and the connection shaft mounting hole is punched and milled by a punching and milling device.

[0042] In one embodiment, the polishing disk bracket includes a lower mounting cylinder and an upper mounting cylinder. The outer polishing disk mounting hole is mounted on the lower mounting cylinder, the connection shaft mounting hole is mounted on the upper mounting cylinder, the upper mounting cylinder and the lower mounting cylinder are connected by a connection rib, and a bean feeding passage communicating with the lower mounting cylinder is formed between the plurality of connection ribs.

[0043] In one embodiment, a first convex ring extends on the upper end surface of the lower mounting cylinder, and a guide curved surface is formed on the upper end surface of the first convex ring, which is smoothly inclined downward to the bean feeding passage.

[0044] In one embodiment, a step portion is formed at the connection portion between the first convex ring and the lower mounting cylinder, and a straight portion provided with a mounting hole is provided on the outer surface of the first convex ring.

[0045] In one embodiment, a fastener mounting concave groove communicating with the lower end surface of the mounting bracket is opened on the hole wall of the outer polishing disk mounting hole.

[0046] In one embodiment, a second convex ring extends below the lower mounting cylinder. The outer polishing disk mounting hole is formed surrounded by the hole wall of the second convex ring. A step portion is formed at the connection portion between the second convex ring and the lower mounting cylinder, and a mounting fastening hole is provided in the step portion of the lower mounting cylinder.

[0047] The present invention further provides a coffee mill including the polishing disk bracket described in any of the above.

[0048] In a fourth aspect, one of the objects of the present invention is to provide a hopper cover for an electric coffee mill and a coffee mill using the hopper cover of the electric coffee mill, which are convenient for opening and closing the hopper cover, have a simple structure, and are not easy to be lost.

[0049] The hopper cover of the electric coffee mill includes a hopper cover bracket provided with a through bean input passage. A cover plate for closing the bean input passage is provided on the hopper cover bracket. A bean input through hole is formed in the cover plate. The hopper cover bracket has a first height position and a second height position. When the cover plate is in the first height position, a bean dropping gap communicating with the bean input passage is formed between the bean input through hole of the cover plate and the hopper cover bracket. When the cover plate is in the second height position, the bean input through hole of the cover plate abuts against the hopper cover bracket and the bean input passage is closed.

[0050] In one embodiment, the cover plate includes a guide plate for covering the bean input passage. An arc-shaped guide surface that is recessed from the outside in the radial direction to the bean input through hole is formed on the guide plate.

[0051] In one embodiment, a gasket is provided at the lower end of the bean input through hole of the cover plate, and the material of the gasket is a deformable elastic material.

[0052] In one embodiment, the cover plate includes a guide plate for covering the bean input passage. At the position of the bean input through hole on the guide plate, a connecting portion is bent inward and extended. A connecting groove for fitting with the connecting portion is provided on the gasket, and the gasket is connected to the connecting portion through the connecting groove.

[0053] In one embodiment, the cover plate is slidably connected and / or screw-connected to the mounting bracket.

[0054] In one embodiment, the cover plate is slidably connected to the hopper cover bracket. A slide groove is provided on the cover plate or the hopper cover bracket, and a slider is provided on the corresponding hopper cover bracket or cover plate. The slide groove is a straight groove extending in the axial direction or an inclined groove extending in a spiral shape. At one end close to the first height position of the slide groove, a positioning groove extends laterally.

[0055] In one embodiment, the cover plate is slidably connected to the hopper cover bracket. A ball plunger assembly is provided on the mounting bracket or the cover plate, and a positioning groove for fitting with the ball plunger assembly is provided on the corresponding cover plate or hopper cover bracket.

[0056] In one embodiment, the number of the ball plunger assemblies and / or the positioning grooves is two, and they are respectively provided corresponding to the first height position and the second height position.

[0057] In one embodiment, the hopper cover bracket is surrounded by an outer annular part and an inner annular part to form a cylindrical structure. A bean feeding passage is formed between the inner annular part and the outer annular part. The cover plate further includes a connecting sleeve sleeved on the outer annular part. The connecting sleeve can move up and down relative to the outer annular part. The bean feeding through hole and the inner annular part are provided in a fitting manner.

[0058] The present invention provides a coffee mill including the hopper cover described in any one of the above.

[0059] In one embodiment, a motor mounting seat with a motor mounting cavity provided at an axial position is provided in the main body housing. The hopper cover bracket is fixedly connected to the motor mounting seat. An arc-shaped cover covering the motor mounting cavity is formed at the axis center of the mounting bracket. The bean feeding passage of the hopper cover bracket is provided to surround the arc-shaped cover. When the cover plate is at the second height position, the bean feeding through hole of the cover plate abuts against the arc-shaped cover and the bean feeding passage is closed.

[0060] In a fifth aspect, one of the objects of the present invention is to provide a motor mounting bracket that strongly supports the adjustment structure and drive structure of an upper-adjustable coffee mill, thereby achieving the compactification and miniaturization of the coffee mill structure.

[0061] The motor mounting bracket includes an inner support ring. A positioning block is provided on the inner wall of the inner support ring. An attachment plate for attaching a motor assembly is provided on the positioning block. A space is provided between the attachment plate and the inner support ring. Thereby, the extending piece of the lifting rod of the coffee mill can pass through the space. The extending piece abuts against the positioning block in the rotational direction, and the positioning block can restrict the lifting rod from rotating. Therefore, when the adjustment knob is rotated, the lifting rod rotates relative to the adjustment gear, and realizes lifting under the screw action, thereby controlling the lifting of the movable grinding disk following the lifting rod, adjusting the gap between the movable grinding disk and the fixed grinding disk, and realizing the adjustment of the powder coarseness. There is no need to change the positions of the motor mounting bracket and the motor during this process.

[0062] In one embodiment, there are at least two of the positioning blocks, and both are connected to the attachment plate. The positioning blocks extend in the axial direction of the inner support ring. By extending the positioning blocks in the axial direction of the inner support ring, the contact surface between the positioning blocks and the extending piece of the lifting rod becomes longer, avoiding the eccentricity of the lifting rod due to local contact. Also, the large contact surface can avoid damaging the parts due to excessive pressure received.

[0063] In one embodiment, the mounting plate is circular, a square positioning groove is provided on the upper side of the mounting plate, the center of the positioning groove faces the center of the mounting plate, and the four corners of the positioning groove all form an edge-breaking structure beyond the mounting plate. A central through hole penetrating the mounting plate and four peripheral through holes uniformly distributed around the central through hole are formed at the bottom of the positioning groove. The motor assembly is positioned by combining with the positioning groove. The central through hole structure is for inserting the output shaft of the motor assembly, and the peripheral through holes are for fitting with bolts to fix the motor assembly.

[0064] In one embodiment, the inner surface of the positioning block is a concave arc surface coaxial with the inner support ring. A first inclined guide surface is formed at the top of the positioning block. The first inclined guide surface inclines from top to bottom towards the center of the inner support ring. An avoidance groove is formed in the inner wall near the upper end position of the positioning block. A second inclined guide surface that inclines from top to bottom towards the center of the inner support ring is formed at a position near the upper end of the inner wall of the avoidance groove. A rectangular first through hole is formed at a position below the second inclined guide surface on the inner wall of the avoidance groove. A second through hole is formed at a position below the first through hole on the inner wall of the avoidance groove. The second through hole includes two vertical holes near both side walls of the avoidance groove and a horizontal hole located at the lower ends of the vertical holes to connect the two vertical holes. The inner wall of the inner support ring is cut by the second through hole to form a movable locking block with a deformable lower end. The inner wall of the lower end of the locking block inclines from top to bottom towards the center of the inner support ring. The concave arc surface fits with the motor assembly to position it. Due to the combination of the first inclined guide surface and the second inclined guide surface, the motor assembly can easily enter the inner support ring during installation. By providing the second through hole, a deformable movable locking block structure that fits with it is formed. Thus, when the motor assembly is installed, the protruding block in the motor assembly presses the locking block outwards to deform and push it aside. Then, the locking block returns and fits with the protruding block in the motor assembly to fix the motor assembly. Thereby, the motor assembly will not move randomly after installation, the position of the output shaft of the motor assembly is easy to adjust, and during the process of locking the position of the motor assembly with bolts after the adjustment is completed, the motor assembly does not move.

[0065] In one embodiment, the lower edge position of the first through hole in the positioning block adjacent to the first connection part is lower than the upper edge position of the second through hole. A thin structure is formed at the upper end of the locking block structure, whereby the locking block has stronger deformation ability and it is convenient to mount the motor assembly. The lower edge position of the first through hole in the positioning block adjacent to the second connection part is higher than the upper edge position of the second through hole. Thereby, the locking block is less likely to deform, and the positioning effect after mounting the motor assembly is stronger.

[0066] In one embodiment, it further includes an outer support ring located outside the inner support ring, and a first connection part and a second connection part connecting the inner support ring and the outer support ring. A bean dropping passage is formed in the region where the first connection part and the second connection part are not provided between the inner support ring and the outer support ring. By forming the bean dropping passage between the inner support ring and the outer support ring, coffee beans can enter the grinding operation regions of the inner grinding disk and the outer grinding disk from the bean dropping passage.

[0067] In one embodiment, a hole is opened as a battery mounting groove at the position of the first connection part on the outer support ring, and a hole is opened as a control module mounting groove at the position of the second connection part. A cable wiring groove communicating from the battery mounting groove to the control module mounting groove is formed on the side surface of the outer support ring. The cable wiring groove extends in the horizontal direction. A downward curved surface is formed on the lower side surface of one end of the cable wiring groove close to the battery mounting groove. Four protruding blocks are uniformly distributed over one circumference in the circumferential direction at the upper end of the outer support ring, and a large circular hole and a small circular hole located above the large circular hole are formed in each protruding block. The battery mounting groove is for mounting the battery assembly, the control module mounting groove is for mounting the control module assembly, the cable wiring groove is for connecting the cable of the battery assembly to the control module assembly, and the large circular hole and the small circular hole are for the elastic abutting member.

[0068] In one embodiment, the first connection portion includes a first side connection plate that forms the left and right side walls of the battery mounting groove, a first upper connection plate that forms the upper wall of the battery mounting groove, a first lower connection plate that forms the lower wall of the battery mounting groove, and a first bottom plate that forms a part of the bottom surface of the battery mounting groove and is formed by the inner support ring portion extending downward. The first upper connection plate is provided horizontally, and first reinforcing ribs are formed at positions near both sides on the upper end surface of the first upper connection plate. The first reinforcing ribs connect the inner support ring and the outer support ring. A cylindrical gear seat, a gear shaft located above the gear seat, and a first guide cone located above the gear shaft are formed in the middle of the first upper connection plate. The outer diameter of the gear shaft is smaller than the outer diameter of the gear seat. The first guide cone has a conical structure that is narrower at the top and wider at the bottom. The outer diameter of the lower end of the first guide cone is smaller than the outer diameter of the gear shaft, and a threaded hole is formed at the center of the upper end surface of the first guide cone. The upper end surface of the gear seat is flush with the upper end surface of the outer support ring, and the side surface of the gear seat is connected to the outer support ring. A horizontal battery stopper piece is formed on the first bottom plate, and charging module mounting posts are formed at the connection portions between the first bottom plate and the first side connection plates on both sides. The position of the charging module mounting posts is lower than the position of the battery stopper piece, and threaded holes are formed at the centers of the charging module mounting posts. Charging module stopper pieces are formed at positions near the lower ends of the two first side connection plates, and a charging module positioning post is formed in the middle of the first lower connection plate. A transmission gear is attached by the gear shaft, and the first guide cone assists in aligning and fixing the positions of the main body housing and the motor mounting bracket. The battery stopper piece restricts the battery from moving downward and occupying the space of the charging module. The charging module mounting posts are fitted with bolts to mount and fix the charging module. The charging module stopper pieces and the charging module positioning post can play a role in regulating the position of the charging module.

[0069] In one embodiment, the second connection part includes a second side connection plate that forms the left and right side walls of the control module mounting concave groove, a second upper connection plate that forms the upper wall of the control module mounting concave groove, a second lower connection plate that forms the lower wall of the control module mounting concave groove, and a second bottom plate that forms a part of the bottom surface of the control module mounting concave groove formed by the inner support ring part extending downward. The second upper connection plate is provided horizontally, and second reinforcing ribs are formed at positions near both sides on the upper end surface of the second upper connection plate. Both of the second reinforcing ribs connect the inner support ring and the outer support ring. A connection column is formed in the middle of the second upper connection plate. The side surface of the connection column is connected to the outer support ring. A second guide cone is formed at the upper end of the connection column. The second guide cone has a conical structure that is narrow at the top and wide at the bottom. The outer diameter of the lower end of the second guide cone is smaller than the outer diameter of the connection column. A threaded hole is formed at the center of the upper end surface of the second guide cone. The second guide cone assists in aligning and fixing the main body housing and the motor mounting bracket. An upper control module stopper piece extending horizontally is formed at a position between the first through hole and the second through hole in the control module mounting concave groove. A middle control module stopper piece extending horizontally is formed at a middle position in the control module mounting concave groove. A lower control module stopper piece extending horizontally is formed at a position near the lower part in the control module mounting concave groove. A control module vertical stopper piece extending in the vertical direction is connected to the middle of the middle control module stopper piece and the lower control module stopper piece. An upper control module mounting column is formed at a position between the upper control module stopper piece and the middle control module stopper piece on the bottom surface of the control module mounting concave groove. A lower control module mounting column is formed at a position near the lower end on the bottom surface of the control module mounting concave groove.

Brief Description of the Drawings

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Mode for Carrying Out the Invention

[0071] The present invention will be described in more detail below in association with the drawings and embodiments. Here, the same parts are denoted by the same reference numerals.

[0072] In order to fully understand the present invention, many details will be described in detail in the following description. However, the present invention can also be realized in another form different from the form described herein. A person skilled in the art can make similar generalizations without departing from the content of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0073] Next, the term "embodiment" in this specification refers to specific features, structures, or characteristics that may be included in at least one embodiment of the present invention. The phrase "in one embodiment" that appears in various places in the specification does not necessarily mean the same embodiment, but may mean a single or alternative embodiment that is mutually exclusive with other embodiments.

[0074] The coffee grinder shown in FIGS. 1 to 3 is an electric coffee grinder, specifically an electric coffee grinder with adjustable stages. The entire case includes a main body housing 1 and a powder receiving box 7 provided below the main body housing 1. Inside the main body housing 1, a grinding assembly including an outer grinding disk 31 and an inner grinding disk 32 is provided. Inside the main body housing 1, a mounting bracket 34, a grinding disk bracket 4, a drive motor 35, and a battery assembly 6 - 48 are provided. The battery assembly 6 - 48 is attached to the mounting bracket 34. The drive motor 35 is fixedly connected to the mounting bracket 34, or the drive motor 35 is provided so as to be axially slidable with respect to the mounting bracket 34. The outer grinding disk 31 is fixed to the grinding disk bracket 4 as a fixed grinding disk. The output shaft of the drive motor 35 is connected to the inner grinding disk 32 via a connecting shaft 36 to drive the rotational movement of the inner grinding disk 32. The inner grinding disk 32 is fitted with the outer grinding disk 12 as a movable grinding disk to grind the raw material.

[0075] An adjustment knob 2 - 1 is rotatably connected to the main body housing 1. A lifting rod 33 - 2 is provided inside the main body housing 1. One end of the lifting rod 33 - 2 is fitted with the adjustment knob 2 - 1 via an interlocking assembly. The adjustment knob 2 - 1 drives the up and down movement of the lifting rod 33 - 2 via the interlocking assembly. When the lifting rod 33 - 2 moves up and down, the lifting rod 33 - 2 drives the up and down movement of the outer grinding disk 31 or the inner grinding disk 32, changing the gap between the outer grinding disk 31 and the inner grinding disk 32, and further changing the powder coarseness of the coffee grinder.

[0076] The adjustment knob 2-1 is rotatably connected to the main body housing 1, and the main body housing 1 restricts the escape of the adjustment knob 2-1 by a restricting member. The restricting member may restrict the escape of the adjustment knob 2-1 in such a way that a locking ring and a locking groove are fitted together. The locking ring / locking groove is provided on the main body housing 1 or another mounting member fixed to the main body housing 1. The other mounting member includes, but is not limited to, the mounting bracket 34. A locking groove / locking ring is provided on the corresponding adjustment knob 2-1, and the locking ring rotates within the locking groove. The adjustment knob 2-1 is provided with adjustment scale markings distributed circumferentially at 300° to 360°. Specifically, as an implementation, the adjustment scale markings are distributed on the adjustment knob 2-1 at 355°.

[0077] As shown in FIG. 2, in a specific example of the linkage assembly, the linkage assembly is the inner drive ring 21. The adjustment knob 2-1 is fixedly connected to the inner drive ring 21 via a connecting rib. The inner drive ring 21 is screw-connected to the lifting rod 33-2. The inner drive ring 21 is a drive nut. The lifting rod 33-2 is provided within the main body housing 1 with rotation restricted and is slidably provided axially. When the adjustment knob 2-1 and the inner drive ring 21 are rotated, the up and down movement of the lifting rod 33-2 is driven, and further the up and down movement of the inner polishing disc 32 or the outer polishing disc 31 is driven to adjust the gap. The lifting rod 33-2 may be the drive sleeve rod 33-1 provided coaxially with the drive motor 35, or may be provided eccentrically.

[0078] As shown in FIGS. 3 to 5, in another specific example of the interlocking assembly, the interlocking assembly includes an inner drive ring 21 and a transmission gear 22. The transmission gear 22 is a reduction gear. The transmission gear 22 and the inner drive ring 21 are rotatably provided on a mounting bracket 34. The adjustment knob 2-1 is an outer adjustment ring 2-2. The outer adjustment ring 2-2 may be rotatably connected to the main body housing 1 or the mounting bracket 34, preferably rotatably connected to the mounting bracket 34. An internal gear ring is provided on the outer adjustment ring 2-2, and an external gear ring is provided on the inner drive ring 21. The reduction gear is rotatably provided between the adjustment knob 2-1 and the inner drive ring 21 so that they mesh with each other. A gear seat 6-28 is provided on the mounting bracket 34. The inner drive ring 21 is provided in contact with the gear seat 6-28. The inner drive ring 21 is axially position-limited and provided within the main body housing 1. The inner drive ring 21 drives the lifting of the polishing assembly by screwing with the lifting rod 33-2 to adjust the gap. The lifting rod 33-2 is a drive sleeve rod 33-1. The drive sleeve rod 33-1 is provided coaxially with the inner drive ring 21. The drive sleeve rod 33-1 is provided within the main body housing 1 with rotation restricted and is slidable axially. The inner drive ring 21 is a drive nut. When turning the adjustment knob 2-1 and the inner drive ring 21, the up and down movement of the drive sleeve rod 33-1 is driven.

[0079] By providing the transmission gear 22, the pitch between the inner drive ring 21 and the lifting rod 33-2 becomes smaller, the adjustment becomes smoother, the adjustment rotation speed of the inner drive ring 21 increases, and the adjustment accuracy is significantly improved. In the prior art, when directly adjusting the lifting member by the adjusting member, since the rotation angle and rotation speed of the adjusting member are limited, the problem of low adjustment accuracy is solved. Also, the user can accurately and clearly read the current roughness level from the adjustment scale 23 during use, solving the problem that the adjustment accuracy and the clarity of the adjustment level display cannot be achieved simultaneously in the two techniques of adjustment by a single adjustment ring and adjustment by multiple adjustment rings in the prior art.

[0080] Set the diameter ratio of the outer adjustment ring 2-2 and the inner drive ring 21, and make the reduction ratio of the outer adjustment ring 2-2 and the inner drive ring 21 1:1.4 or less, so that the rotation speed of the inner drive ring 21 can be effectively increased, and the adjustment accuracy can be further improved.

[0081] Preferably, by setting the reduction ratio of the outer adjustment ring 2-2 and the inner drive ring 21 to be 1:3 or more and 1:1.6 or less, the set ratio of the outer adjustment ring 2-2 and the inner drive ring 21 becomes suitable for a miniaturized portable coffee mill, and the minimum adjustment unit of the adjustment scale 23 is within a range that can be controlled by delicate hand operations and movements.

[0082] The outer adjustment ring 2-2, the inner drive ring 21, the transmission gear 22, and the drive sleeve rod 33-1 constitute a roughness adjustment structure. When the roughness adjustment structure is provided at the lower end of the main body housing 1, the output end of the drive sleeve rod 33-1 drives the movement of the outer polishing disk 31 to adjust the gap. When the roughness adjustment structure is provided at the upper end of the main body housing 1, the output end of the drive sleeve rod 33-1 drives the movement of the inner polishing disk 32 to adjust the gap.

[0083] In a specific embodiment where the lifting rod 33-2 drives the movement of the inner polishing disk 32, the lifting rod 33-2 may be the drive sleeve rod 33-1, which drives the movement in the axial direction of the drive motor 35 and further drives the rotation of the inner polishing disk 32. Specifically, the drive sleeve rod 33-1 is slidably provided with respect to the mounting bracket 34. A drive motor mounting cavity is provided in the drive sleeve rod 33-1. The drive motor 10 is fixed in the drive motor mounting cavity of the drive sleeve rod 33-1. The connecting shaft 36 is fixedly connected to the output end of the drive motor 10, and the inner polishing disk 32 is connected to the other end of the connecting shaft 36.

[0084] Its working principle is as follows. Rotate the adjusting knob 2-1 to drive the rotation of the inner drive ring 21 through the transmission gear 22 or connection, and further drive the up-and-down movement of the drive sleeve rod 33-1 by screw fitting. The drive sleeve rod 33-1 drives the up-and-down movement of the motor, the connection shaft 36 and the inner grinding disc 32 fixed to the connection shaft 36. The overall structure is simple and the fitting accuracy of each internal member is high.

[0085] As shown in FIGS. 2 to 5, in another specific embodiment where the lifting rod 33-2 drives the movement of the inner grinding disc 32, the lifting rod 33-2 is the drive sleeve rod 33-1. The drive sleeve rod 33-1 may directly drive the movement of the connection shaft 36 of the inner grinding disc 32. Specifically, the drive motor 35 is fixed to the mounting bracket 34. The output end of the drive motor 35 is connected to the connection shaft 36. The connection shaft 36 is provided to be axially slidable with respect to the output end of the drive motor 35. The connection shaft 36 may be inserted into the output shaft joint of the drive motor 35 as a polygonal prism to limit its rotation. The drive motor 35 drives the rotation of the connection shaft 36. The inner drive ring 21 is screw-connected to the drive sleeve rod 33-1. The drive sleeve rod 33-1 is provided to be slidable with respect to the mounting bracket 34. A through hole axially opened is provided in the drive sleeve rod 33-1. The drive sleeve rod 33-1 is coaxially sleeved outside the drive motor 35. An avoidance groove through which the mounting bracket 34 passes is opened in the drive sleeve rod 33-1. The rotation of the drive sleeve rod 33-1 may be limited by the avoidance groove, or a slider and a slide groove may be separately provided between the drive sleeve rod 33-1 and the main body housing 1 to limit the rotation of the drive sleeve rod 33-1. The mounting bracket 34 is provided with a mounting plate 6-6 for mounting the drive motor 35 in the motor mounting cavity. A through groove through which the drive sleeve rod 33-1 slides is provided in the mounting plate 6-6, and further the rotation of the drive sleeve rod 33-1 is limited.

[0086] Its working principle is as follows. Rotate the outer adjustment ring 2-2 to drive the rotation of the inner drive ring 21 by the transmission gear 22, and further interlock the up and down movement of the drive sleeve rod 33-1 by screw fitting. The drive sleeve rod 33-1 drives the up and down movement of the connecting shaft 36 and the inner grinding disc 32 fixed to the connecting shaft 36. By directly driving the up and down movement of the inner grinding disc 32, the disadvantages of the adjustment structure, such as the fatigue of the adjustment structure caused by driving the movement of the motor together and the influence on the stability of the powder roughness due to the gradual shift of the position, are solved.

[0087] As shown in Fig. 5, one end of the drive sleeve rod 33-1 is fixedly connected to the connecting shaft 36 in the axial direction. The specific method of axial fixed connection is that the connecting shaft 36 abuts against the drive sleeve rod 33-1 in the axial direction. The drive sleeve rod 33-1 includes a connecting seat 37 and is connected to the connecting shaft 36 through the connecting seat 37. A first bearing 38 is provided on the connecting seat 37. The connecting shaft 36 is sleeved rotatably in the first bearing 38. The connecting shaft 36 is connected to the first bearing 38 so as to be movable up and down. A concave groove 361 is provided on the outer wall of the connecting shaft 36. A circlip 362 for abutting against the upper end surface of the first bearing 38 of the drive sleeve rod 36 is fitted in the concave groove 361. A biasing spring 39 is sleeved on the connecting shaft 36. One end of the biasing spring 39 abuts against the inner grinding disc 32, and the other end abuts against the grinding disc bracket 4. Preferably, a gasket is provided at the lower end of the grinding disc bracket 4. The biasing spring 39 abuts against the gasket. The biasing spring 39 provides a downward biasing force to the connecting shaft 36. Under the limitation of the upper circlip 362, the connecting shaft 36 is restricted to move axially on the connecting seat 37 of the drive sleeve rod 33-1. Therefore, under the two-way regulation of the lower biasing spring 39 and the upper circlip 361, the connecting shaft 36 is restricted to move axially with respect to the drive sleeve rod 33-1.

[0088] The biasing spring 39 is initially in a compressed state. When the drive sleeve rod 33-1 rises, the circlip 362 abuts against the upper end face of the drive sleeve rod 33-1, restricting the connecting shaft 36 from moving downward relative to the drive sleeve rod 33-1. The inner polishing disc 32 simultaneously rises together with the connecting shaft 36, increasing the compression amount of the biasing spring 39, reducing the gap between the inner polishing disc 32 and the outer polishing disc 31, and balancing the biasing force of the biasing spring 39 and the force with which the circlip 362 abuts against the first bearing 38.

[0089] When the drive sleeve rod 33-1 moves downward, the compression amount of the biasing spring 39 is released, moving the inner polishing disc 32 in a direction opposite to the drive sleeve rod 33-1. The circlip 362 follows the drive sleeve rod 33-1 under the tension of the biasing spring 39 to drive the downward movement of the connecting shaft 36 and maintain the contact of the circlip 362 with the first bearing 38, and maintain the balance between the biasing force of the biasing spring 39 and the force with which the circlip 362 abuts against the drive sleeve rod 33-1.

[0090] As shown in Figure 2, the mounting form of the axial fixed connection between the connecting shaft 36 and the drive sleeve rod 33-1 may be fixed to the connection seat 37 of the drive sleeve rod 33-1 by the first bearing 38. The connecting shaft 36 is rotatably connected to the first bearing 38. A biasing spring 39 is mounted between the inner polishing disc 32 and the connecting shaft 36. A flange is provided at the lower part of the connecting shaft 36. The upper end face of the flange and the upper end face of the inner polishing disc 32 abut against the biasing spring 39. The inner polishing disc 32 and the connecting shaft 36 have a small movement range in the axial direction. By providing the biasing spring 39 between the connecting shaft 36 and the inner polishing disc 32, a strong direct biasing force can be provided. Since the connecting shaft 36 and the inner polishing disc 32 do not rotate relative to each other, wear due to the rotation of the biasing spring 39 is avoided.

[0091] In the specific mounting form of the adjustment knob 2-1, in an embodiment where the bean input opening 56 is provided above the main body housing 1 and the adjustment knob 2-1 is provided at the upper end of the main body housing 1, the bean input opening 56 may be provided at the upper end of the adjustment knob 2-1, or a hopper cover plate 52 may be provided on the main body housing 1 and the bean input opening 56 may be provided on the hopper cover plate 52. The adjustment knob 2-1 may be detachably connected, and the beans may be input after removing the adjustment knob 2-1, or an opening may be provided on the side surface of the main body housing 1.

[0092] As shown in FIG. 2, in one embodiment, the funnel portion and the rotating portion of the adjustment knob 2-1 are integrally formed and fixed. A bean input opening 56 is opened at the center of the adjustment knob 2-1, and a funnel portion is formed on the upper top surface of the adjustment knob 2-1 that bends and inclines downward toward the center, and the fall of the beans is more effectively guided.

[0093] As shown in FIGS. 4 to 7, the funnel portion and the rotating portion of the adjustment knob 2-1 may be separately provided. The adjustment knob 2-1 is an outer adjustment ring 2-2, and a rolling groove 24 is provided in the outer adjustment ring 2-2. The mounting bracket 34 is provided with a first ball plunger assembly 25 that is rollably fitted with the rolling groove 24, realizing a more stable and smooth rotation of the outer adjustment ring 2-2. The mounting bracket 34 is further provided with a second ball plunger assembly 26 that fits with the internal gear ring or stepped groove 27 of the outer adjustment ring 2-2. The stepped groove 27 is composed of a plurality of arc-shaped grooves 28 arranged in the circumferential direction. The second ball plunger assembly 26 bounces between the internal teeth or arc-shaped grooves 28 when the outer adjustment ring 2-2 rotates, providing sliding resistance to the outer adjustment ring 2-2 and playing a role in locking and positioning the outer adjustment ring 2-2. The specific structure of the arc-shaped groove 28 of the outer adjustment ring 2-2 is as shown in FIG. 7.

[0094] The ball plunger assembly in the present invention may be a general ball plunger of the prior art. Preferably, the ball plunger assembly includes a sleeve, a spring member, and a steel ball. The steel ball is provided with its position restricted within the sleeve, and the spring member is provided in contact between the bottom surface of the sleeve and the steel ball, applying an elastic support force to the steel ball on the side opposite to the bottom surface of the sleeve, and the steel ball bounces under the action of an external force.

[0095] In the funnel portion or the adjustment knob 2-1, a first baffle ring extends downward at the position of the bean input opening 56, which can prevent the beans from jumping out to a certain extent. The inner wall of the main body housing 1 and the outer walls of the drive motor 35 and the battery assembly 6-48 form a bean input passage through which the beans pass. The bean input opening 56 communicates with the bean input passage to form a relatively large bean storage space.

[0096] As shown in FIGS. 8 to 14, in the embodiment where an opening is provided in the hopper cover, a hopper cover bracket 51 is provided above the main body housing 1. The hopper cover bracket 51 may be integrally formed with the mounting bracket 34, or may be removably fixedly connected via a fastener. The hopper cover bracket 51 is provided with a through bean input passage. The cover plate 52 is provided on the hopper cover bracket 51 so as to be vertically adjustable. A bean input through hole 521 is formed in the cover plate 52. When the cover plate 52 rises from the hopper cover bracket 51 to the first height position, a bean dropping gap 53 communicating with the bean input passage is formed between the bean input through hole 521 of the cover plate 52 and the hopper cover bracket 51. When the cover plate 52 approaches the hopper cover bracket 51 and descends to the second height position, the bean input through hole 521 of the cover plate 52 abuts against the hopper cover bracket 51 to close the bean input passage. The connection method between the cover plate 52 and the hopper cover bracket 51 may be a slidable connection or a screw connection, and the height position of the cover plate 52 may be adjusted linearly or spirally.

[0097] Taking a slidable connection as an example, a slide groove 58 is provided in the hopper cover bracket 51, and a slider that fits into the slide groove 58 is provided on the cover plate 52. Preferably, the number of slide grooves 58 is at least two, and they are provided symmetrically on the hopper cover bracket 51.

[0098] As shown in FIG. 11, in one embodiment of the slide groove 58, the slide groove 58 extends linearly in the axial direction of the hopper cover bracket 51, and positioning at the first height position and the second height position is achieved by an elastic locking device. The elastic locking device may be a ball plunger assembly, and is preferably provided on the hopper cover bracket 51.

[0099] As shown in FIG. 12, in another embodiment of the slide groove 58, the slide groove 58 extends linearly in the axial direction of the hopper cover bracket 51, and a second positioning groove 59 extends laterally at one end of the slide groove 58 close to the first height. When the cover plate 52 is linearly pulled upward to reach the first height position, the slider on the cover plate 52 is further rotated circumferentially to be positioned in the second positioning groove 59.

[0100] As shown in FIG. 13, in another embodiment of the slide groove 58, the slide groove 58 may be an inclined groove that spirally extends on the outer peripheral surface of the hopper cover bracket 51. Preferably, a second positioning groove 59 may extend laterally at one end of the slide groove 58 close to the first height. When the cover plate 52 reaches the first height position along the inclined groove by rotation, the slider on the cover plate 52 is further rotated to be positioned in the second positioning groove 19.

[0101] The cover plate 52 opens and closes the bean input passage in a lifting manner, and the user can conveniently operate regardless of whether pushing / pulling or a spiral is adopted. The cover plate 52 and the hopper cover bracket 51 are not detachable, and loss of the cover plate 52 during use is prevented.

[0102] As shown in FIG. 9, the upper end surface of the cover plate 52 is a guide plate 522. The guide plate 522 forms an arc-shaped guide surface that is recessed radially outward from the outside into the bean input through hole 521. When the cover plate 52 descends to the second height, the guide plate 522 completely covers the bean input passage 2 in the hopper cover bracket 51. Thereby, the cover plate 52 exerts the function of the hopper cover and also exerts the function of the bean dropping guide plate 522. Multiple functions are integrated, and the structure of the coffee mill is simplified.

[0103] As shown in FIG. 10, a third ball plunger assembly 54 is provided on the hopper cover bracket 51, and a first positioning groove 55 for fitting with the third ball plunger assembly 54 is provided on the cover plate 52, or the cover plate 52 is provided with a ball plunger assembly 54, and the hopper cover bracket 51 is provided with a first positioning groove 55 for fitting with the third ball plunger assembly 54. The third ball plunger assembly 54 includes an elastic member and a ball. When the ball of the third ball plunger assembly 54 is locked in the first positioning groove 55, the two states of the first height position and the second height position of the cover plate 52 are locked, and it also plays a role in indicating the completion of the state switching of the cover plate 52. The number of the third ball plunger assemblies 51 or / and the first positioning grooves 55 is two, and they are respectively provided corresponding to the first height position and the second height position. Preferably, the number of the third ball plunger assemblies 54 and the first positioning grooves 55 is both two, whereby the locking state of the cover plate 52 becomes more stable.

[0104] As shown in FIG. 10, the cover plate 52 includes a guide plate 522 and a connection sleeve 526 on the upper end surface. A gasket 523 is provided at the lower end of the bean input through hole 521 on the guide plate 522. The material of the gasket 523 is a deformable elastic material, such as a high-elastic polymer material like rubber, silicon, or foaming material. The gasket 523 serves as a contact portion that directly contacts the hopper cover bracket 51. By adopting a deformable elastic material, it can achieve the protective effect of preventing collisions, avoid deformation caused by excessive adjustment of the cover plate 52. On the other hand, the gasket 523 reduces the gap after the cover plate 52 and the hopper cover bracket 51 are in closed contact, plays a sealing role, and further prevents the intrusion of foreign objects or dust.

[0105] On the guide plate 522, a connection portion 524 is bent inward and extends at the position of the bean input through hole 521. A connection groove 525 for fitting with the connection portion 524 is provided on the gasket 523. The gasket 523 is connected to the connection portion 524 through the connection groove 525. The connection relationship between the gasket 523 and the connection portion 524 may be adhesion or engagement or interference fit. Since the inner annular surface and the lower end surface of the gasket 523 are force-receiving contact surfaces, by making the connection portion 524 have a bent-inward part, the force received by the connection groove 525 of the gasket 523 and the connection portion 524 can be decomposed, and deformation and detachment due to the force received at the connection part between the gasket 523 and the guide plate 522 can be reduced.

[0106] The hopper cover bracket 51 is surrounded by an outer annular portion and an inner annular portion to form a cylindrical structure. A bean input passage is formed between the inner annular portion and the outer annular portion. The connection sleeve 526 is slidably connected or screwed to the outer annular portion. An arc-shaped cover 57 is provided on the inner annular portion. A coffee bean dropping guide portion is formed by the arc-shaped cover 57 and the guide plate 522. Preferably, the guide plate 522 and the arc-shaped cover 57 are made of a metal plate, so that the outer surface of the coffee mill can be easily cleaned.

[0107] The mounting bracket 34 includes a motor mounting bracket 6 provided with a motor mounting cavity in the axial position. The hopper cover bracket 51 is fixedly connected to the motor mounting bracket 6. The cover plate 52 further includes a connecting sleeve 526 sleeved on the outer annular portion. The connecting sleeve 526 is connected to the outer annular portion in a vertically movable manner. An arc-shaped cover 57 covering the coffee mill motor mounting cavity is formed on the inner annular portion. The bean inlet through-hole 521 of the cover plate 52 abuts against the arc-shaped cover 57, and the bean inlet passage 2 is closed.

[0108] As shown in FIG. 14, in an embodiment where the adjusting knob 2-1 is provided at the upper end of the main body housing 1 and sleeved with the hopper cover bracket 51, a window 511 is opened in the hopper cover bracket 51, and an interlocking structure in which the adjusting knob 2-1 and the inner drive ring 21 are fitted to each other is accommodated in the window 511. Preferably, a gear seat 6-28 is provided on the hopper cover bracket 51, the transmission gear 22 is rotatably provided on the gear seat 6-28, the hopper cover bracket 51 is provided with a window 511 at a position close to the gear seat 6-28, and the transmission gear 22 partially extends out from the window 511 and meshes with the internal gear ring 201 of the outer adjusting ring 2-2.

[0109] As shown in FIGS. 15 to 18, a specific embodiment of the integrally formed polishing disc bracket 4 is that the polishing disc bracket 4 includes an outer polishing disc mounting hole 41 and a connecting shaft mounting hole 42. The connecting shaft mounting hole 42 includes at least one bearing mounting position 421, preferably two. Two second bearings 43 coaxially provided in the connecting shaft mounting hole 42 are provided, and the connecting shaft 36 is provided to pass through the second bearings 43. The material may be selected from metal or alloy materials. The alloy material includes aluminum alloy. The manufacturing process of the polishing disc bracket 4 can select casting and integral forming or punching and milling of massive materials, and the concentricity of the outer polishing disc mounting hole 41 and the connecting shaft mounting hole 42 is greatly improved.

[0110] The hole wall of the bearing mounting position 44 and the hole wall of the connecting shaft mounting hole 42 are provided in a continuous straight line, and the second bearing 43 and the bearing mounting position 44 are press-fitted. When there are two bearing mounting positions 44, the bearing mounting position 421 includes the first bearing mounting position 422 and the second bearing mounting position 423, and a positioning ring 47 is provided between the two bearings 43. The positioning ring 47 abuts against the second bearings 43 provided on both sides respectively, restricting the downward movement of the upper second bearing 43 and the upward movement of the lower second bearing 43. Preferably, limiting members for restricting the escape of the two second bearings 43 are provided at the upper end and the lower end of the connecting shaft mounting hole 42 respectively. The limiting members may be selected from known limiting members in the prior art, such as position regulating spacers or position regulating pins.

[0111] When the polishing disc bracket 4 selects block material punching and milling forming, first, the alloy raw material is clamped by a jig, and the outer polishing disc mounting hole 41 is drilled on one side of the alloy block by a punching and milling device, and the connecting shaft mounting hole 42 is further drilled deeper on the same side by the punching and milling device. The hole diameter of the connecting shaft mounting hole 42 is smaller than that of the outer polishing disc mounting hole 41. By making the side wall of the connecting shaft mounting hole 43 linear, the conventional stepped bearing mounting hole is omitted, and the connecting shaft mounting hole 42 and the outer polishing disc mounting hole 41 can be positioned and mounted by a punching and milling device on one side for punching and milling forming, avoiding the concentricity error in the mounting process of multiple punching and milling devices in the prior art.

[0112] After punching and milling the outer grinding disk mounting hole 41 and the connecting shaft mounting hole 42, grinding and hole drilling are performed on the outer periphery of the semi-finished product. As a result, the main body bracket externally includes a lower mounting cylinder 47 and an upper mounting cylinder 45. The outer grinding disk mounting hole 41 is provided in the lower mounting cylinder 47, and the connecting shaft mounting hole 42 is provided in the upper mounting cylinder 45. The upper mounting cylinder 45 and the lower mounting cylinder 47 are connected via a connecting rib 46. A bean input passage communicating with the lower mounting cylinder 47 is formed between the plurality of connecting ribs 46. A first convex ring 471 extends on the upper end surface of the lower mounting cylinder 47. A guide curved surface 472 is formed on the upper end surface of the first convex ring 471 and is smoothly inclined downward by the bean input passage, so as to more smoothly and uniformly guide the beans in the bean storage cavity into the grinding cavity.

[0113] A step portion 473 is formed at the connection part of the first convex ring 471 and the lower mounting cylinder 47. A straight portion for forming a rotation prevention structure by fitting with the case of the coffee mill is provided on the outer surface of the first convex ring 471. A mounting hole 474 is provided in the straight portion. The first convex ring 471 of the coffee mill bracket is fitted with the mounting bracket 34. The mounting bracket 34 is fixedly connected to the grinding disk bracket 4 via the fastener connection mounting hole 474, thereby making the concentricity of the mounting bracket 34 for mounting the subsequent roughness adjustment assembly and the grinding disk bracket 4 higher, and further improving the adjustment accuracy of the roughness adjustment assembly.

[0114] The outer grinding disk 31 and the outer grinding disk mounting hole 41 are press-fitted. A fastener mounting concave groove 475 communicating with the lower end surface of the mounting bracket is opened on the hole wall of the outer grinding disk mounting hole 41. After mounting the outer grinding disk 31 in the outer grinding disk mounting hole 41, the outer grinding disk 31 is locked by mounting a fastener in the fastener mounting concave groove 17, preventing the rotation and escape of the outer grinding disk 31. The fastener may be selected from a screw or a pin, etc.

[0115] As a preferred embodiment, a second convex ring 476 extends downward from the lower mounting cylinder 47. An outer polishing disc mounting hole 41 is formed and surrounded by the hole wall of the second convex ring 476. A step portion 473 is formed at the connection site between the second convex ring 476 and the lower mounting cylinder 47. The lower mounting cylinder 47 is provided with a mounting fastening hole 477 at the step portion 473. When assembling the polishing disc bracket 4, a lower seat 48 is mounted below the lower mounting cylinder 47. A baffle plate is formed on the lower seat 48. The connection portion of the baffle plate is connected to the mounting fastening hole 477 and extends radially on the side of the outer polishing disc mounting hole 41 to form a baffle ring for receiving the outer polishing disc 31. The baffle ring not only serves to receive the outer polishing disc 31 but also forms a baffle ring surrounding the powder discharge port, effectively preventing the scattering of powder.

[0116] An accommodation groove for vertically regulating the outer polishing disc 31 is formed between the outer polishing disc mounting hole 41 of the polishing disc bracket 4 and the lower seat 48. The polishing disc bracket 4 forms a guide conical surface with a constricted lower end above the accommodation groove. The lower seat 48 is fixed to the main body housing 1. The lower seat 48 is provided with a powder discharge guide baffle ring 481. The inner surface of the powder discharge guide baffle ring 481 is an arc surface that expands radially from top to bottom. A mounting concave groove 22 for connecting to the powder receiving box 7 is provided on the lower end surface of the lower seat 48. The mounting concave groove 22 is located at a position higher than the powder discharge guide baffle ring 481. The powder discharge guide baffle ring 481 guides the powder discharge, reduces the scattering during powder falling, effectively prevents the scattering of finely polished powder to the connection site between the powder receiving box 7 and the lower seat 48, and can reduce the powder accumulation amount.

[0117] The connection method between the powder receiving box 7 and the lower seat 48 may be screw connection, sealed connection or engagement connection.

[0118] As shown in FIGS. 19 to 22, the mounting bracket 34 includes a motor mounting bracket 6, and an embodiment of the motor mounting bracket 6 is as follows. The motor mounting bracket 6 includes an inner support ring 6-1, an outer support ring 6-2 located outside the inner support ring 6-1, a first connecting portion 6-3 and a second connecting portion 6-4 that are respectively located on both sides of the inner support ring 6-1 and connect the inner support ring 6-1 and the outer support ring 6-2. The inner support ring 6-1, the outer support ring 6-2, the first connecting portion 6-3 and the second connecting portion 6-4 are all integrally injection-molded, and a bean dropping passage is formed in the region where the first connecting portion 6-3 and the second connecting portion 6-4 are not provided between the inner support ring 6-1 and the outer support ring 6-2.

[0119] As shown in FIG. 17, positioning blocks 6-5 are integrally formed by protruding at positions on the inner wall of the inner support ring 6-1 close to the first connecting portion 6-3 and the second connecting portion 6-4. The positioning blocks 6-5 all extend from top to bottom, and a mounting plate 6-6 connecting the two positioning blocks 6-5 is integrally formed therebetween. The mounting plate 6-6 is circular, the diameter of the mounting plate 6-6 is smaller than the inner diameter of the inner support ring 6-1, a square positioning groove 6-7 is formed on the upper side of the mounting plate 6-6, the center of the positioning groove 6-7 is directly opposite to the center of the mounting plate 6-6, and the four corners of the positioning groove 6-7 all form an edge break structure beyond the mounting plate 6-6. Two opposite sides of the positioning groove 6-7 are directly opposite to the first connecting portion 6-3 and the second connecting portion 6-4. A central through hole 6-8 penetrating the mounting plate 6-6 and four peripheral through holes 6-9 uniformly distributed around the central through hole 6-8 are formed at the bottom of the positioning groove 6-7.

[0120] As shown in Fig. 17, the inner surface of the positioning block 6-5 is an arc surface that is concave inward. The arc surface is coaxial with the inner support ring 6-1, and the inner diameter dimension is equal to or slightly larger than the outer diameter dimension of the drive motor 35. A first inclined guide surface 6-10 is formed at the top of the positioning block 6-5. The first inclined guide surface 6-10 is inclined from top to bottom in the central direction of the inner support ring 6-1, and guides the drive motor 35 so that it can easily enter into the inner support ring 6-1. An avoidance groove 6-11 is formed on the inner wall of the positioning block 6-5 near the upper end position. The inner wall of the avoidance groove 6-11 has a second inclined guide surface 6-12 formed at a position near the upper end and inclined from top to bottom in the central direction of the inner support ring 6-1. A rectangular first through hole 6-13 is formed at a position below the second inclined guide surface 6-12 on the inner wall of the avoidance groove 6-11. A second through hole 6-14 is formed at a position below the first through hole 6-13 on the inner wall of the avoidance groove 6-11. The second through hole 6-14 includes two vertical holes near both side walls of the avoidance groove 6-11 and a horizontal hole located at the lower end of the vertical holes to connect the two vertical holes. The inner wall of the inner support ring 6-1 is cut by the second through hole 6-14 to form a movable locking block 6-15 with a deformable lower end. The inner wall of the lower end of the locking block 6-15 is inclined from top to bottom in the central direction of the inner support ring 6-1. The lower edge position of the first through hole 6-13 in the positioning block 6-5 adjacent to the first connection part 6-3 is lower than the upper edge position of the second through hole 6-14. The lower edge position of the first through hole 6-13 in the positioning block 6-5 adjacent to the second connection part 6-4 is higher than the upper edge position of the second through hole 6-14.

[0121] As shown in FIGS. 19 and 20, a hole is formed as a battery mounting groove 6-16 at the position of the first connection portion 6-3 of the outer support ring 6-2, and a hole is formed as a control module mounting groove 6-17 at the position of the second connection portion 6-4. Dish holes 6-18 for passing bolts are formed at positions below the battery mounting groove 6-16 and below the control module mounting groove 6-17 on the side surface of the outer support ring 6-2. A cable wiring groove 6-19 communicating from the battery mounting groove 6-16 to the control module mounting groove 6-17 is formed on the side surface of the outer support ring 6-2. The cable wiring groove 6-19 extends in the horizontal direction, and a downward curved surface is formed on the lower side surface of one end of the cable wiring groove 6-19 close to the battery mounting groove 6-16, whereby the cable in the battery mounting groove 6-16 can pass through the cable wiring groove 6-19 in a direction at a larger angle. Four protruding blocks 6-20 are formed on the upper end of the outer support ring 6-2 so as to be uniformly distributed over one circumference in the circumferential direction. A large circular hole 6-21 and a small circular hole 6-22 located above the large circular hole 6-21 are formed in each protruding block 6-20.

[0122] As shown in Fig. 19, the first connection part 6-3 includes a first side connection plate 6-23 that forms the left and right side walls of the battery mounting groove 6-16, a first upper connection plate 6-24 that forms the upper wall of the battery mounting groove 6-16, a first lower connection plate 6-25 that forms the lower wall of the battery mounting groove 6-16, and a first bottom plate 6-26 that forms a part of the bottom surface of the battery mounting groove 6-16 and is formed by the partial downward extension of the inner support ring 6-1. The first upper connection plate 6-24 is provided horizontally, and first reinforcing ribs 6-27 are formed on the upper end surface of the first upper connection plate 6-24 near both sides. The first reinforcing ribs 6-27 connect the inner support ring 6-1 and the outer support ring 6-2. A cylindrical gear seat 6-28, a gear shaft 6-29 located above the gear seat 6-28, and a first guide cone 6-30 located above the gear shaft 6-29 are formed in the middle of the first upper connection plate 6-24. The outer diameter of the gear shaft 6-29 is smaller than the outer diameter of the gear seat 6-28. The first guide cone 6-30 has a conical structure that is narrower at the top and wider at the bottom. The outer diameter of the lower end of the first guide cone 6-30 is smaller than the outer diameter of the gear shaft 6-29, and a threaded hole is formed at the center of the upper end surface of the first guide cone 6-30. The upper end surface of the gear seat 6-28 is flush with the upper end surface of the outer support ring 6-2, and the side surface of the gear seat 6-28 is connected to the outer support ring 6-2. A horizontal battery stopper piece 6-31 is formed on the first bottom plate 6-26, and charging module mounting posts 6-32 are formed at the connection parts between the first bottom plate 6-26 and the first side connection plates 6-23 on both sides. The position of the charging module mounting posts 6-32 is lower than the position of the battery stopper piece 6-31, and threaded holes are formed at the centers of the charging module mounting posts 6-32. Charging module stopper pieces 6-33 are formed on both of the first side connection plates 6-23 near the lower ends, and a charging module positioning post 6-34 is formed in the middle of the first lower connection plate 6-25.

[0123] The second connection part 6-4 includes a second side connection plate 6-35 that constitutes the left and right side walls of the control module mounting concave groove 6-17, a second upper connection plate 6-36 that constitutes the upper wall of the control module mounting concave groove 6-17, a second lower connection plate 6-37 that constitutes the lower wall of the control module mounting concave groove 6-17, and a second bottom plate 6-38 that forms a part of the bottom surface of the control module mounting concave groove 6-17 and is formed by the partial downward extension of the inner support ring 6-1. The second upper connection plate 6-36 is provided horizontally, and second reinforcing ribs 6-39 are formed on the upper end surface of the second upper connection plate 6-36 at positions near both sides. Both of the second reinforcing ribs 6-39 connect the inner support ring 6-1 and the outer support ring 6-2. A connection post 6-40 is formed in the middle of the second upper connection plate 36. The side surface of the connection post 6-40 is connected to the outer support ring 6-2. A second guide cone 6-41 is formed at the upper end of the connection post 40. The second guide cone 6-41 has a conical structure that is narrow at the top and wide at the bottom. The outer diameter of the lower end of the second guide cone 6-41 is smaller than the outer diameter of the connection post 6-40, and a threaded hole is formed at the center of the upper end surface of the second guide cone 6-41. An upper control module stopper piece 6-42 that extends horizontally is formed at a position between the first through hole 6-13 and the second through hole 6-14 in the control module mounting concave groove 6-17. A middle control module stopper piece 6-43 that extends horizontally is formed at the middle position in the control module mounting concave groove 6-17. A lower control module stopper piece 6-44 that extends horizontally is formed at a position near the lower part in the control module mounting concave groove 6-17. A control module vertical stopper piece 45 that extends vertically is connected to the middle of the middle control module stopper piece 6-43 and the lower control module stopper piece 6-44. An upper control module mounting post 6-46 is formed at a position between the upper control module stopper piece 6-42 and the middle control module stopper piece 6-43 on the bottom surface of the control module mounting concave groove 6-17. A lower control module mounting post 6-47 is formed at a position near the lower end on the bottom surface of the control module mounting concave groove 6-17.

[0124] As shown in FIGS. 21 and 22, elastic abutting members 6-51 are mounted in both the large circular hole 6-21 and the small circular hole 6-22 of the battery mounting bracket 6, and are respectively abutted against the internal teeth of the adjusting knob 2-1 and the inner annular groove of the adjusting knob 2-1, controlling the adjusting knob 2-1 to rotate rather than move axially, and facilitating the accurate control of the rotation angle of the adjusting knob 2-1. A transmission gear 22 meshing with the adjusting knob 2-1 is mounted on the gear shaft 6-29 of the battery mounting bracket, and an inner drive ring 21 meshing with the transmission gear 22 is mounted above the inner support ring 1 of the battery mounting bracket 6. At the upper end of the lifting rod 33-2, two extending pieces 6-52 extending to the position of the transmission gear 22 are formed through the gap between the mounting plate 6-6 and the inner support ring 6-1, and external threads fitting with the internal threads of the transmission gear 22 are formed on the extending pieces 6-52.

[0125] Since the extending piece 6-52 of the lifting rod 33-2 cannot rotate due to the position restricting action of the positioning block 6-5, the lifting rod 33-2 rotates relative to the transmission gear 22. When the two rotate relative to each other, due to the screw connection relationship, the lifting rod 33-2 moves up and down, driving the connection shaft 36 and the lifting of the inner polishing disc 32 on the connection shaft 36 together, realizing the gap adjustment between the inner polishing disc 32 and the outer polishing disc 31, and changing the powder coarseness of the coffee mill.

[0126] In one embodiment, a zero adjustment nut 8 is provided at the upper end of the lifting rod 33-2. The zero adjustment nut 8 is provided with a height position for indicating the lifting rod 33-2. The zero adjustment nut 8 is screwed to the lifting rod 33-2. By providing the zero adjustment nut 8, escape due to excessive adjustment is prevented. After the assembly is completed, the zero adjustment nut 8 is rotated to adjust the initial position of the lifting rod 33-2, ensuring that the gap between the outer polishing disc 31 and the inner polishing disc 32 is at the initial set position. The initial set gap is 0.05 - 0.5 mm, maintaining a high consistency in the settings at the time of shipment of each device, and solving the errors caused by the assembly process and materials.

[0127] At the upper end of the zero adjustment nut 8, a conical surface that fits into the opening of the adjustment knob 2-1 is formed. This conical surface is a guide slope that guides the beans into the bean input passage, guiding the beans to fall into the bean input passage and preventing the beans from clogging in the gaps of the adjustment assembly.

[0128] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments, and any technical solutions based on the idea of the present invention shall be included in the protection scope of the present invention. It should be noted that a plurality of improvements and modifications made by those skilled in the art without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Explanation of Reference Numerals

[0129] 1 Main body housing 201 Internal gear ring 202 External gear ring 2-1 Adjustment knob 2-2 Outer adjustment ring 21 Inner drive ring 22 Transmission gear 23 Adjustment scale 24 Rolling groove 25 First ball plunger assembly 26 Second ball plunger assembly 27 Step groove 28 Arc-shaped groove 31 Outer grinding disk 32 Inner grinding disk 33-1 Drive sleeve rod 33-2 Lifting rod 34 Mounting bracket 35 Drive motor 36 Connecting shaft 361 Groove 362 Circlip 37 Connection seat 38 First bearing 39 Biasing spring 4 Grinding disk bracket 41 Outer grinding disk mounting hole 42 Connecting shaft mounting hole 421 Bearing mounting position 422 First bearing mounting position 423 Second bearing mounting position 43 Second bearing 44 Positioning ring 45 Upper mounting cylinder 46 Connecting rib 47 Lower mounting cylinder 471 First convex ring 472 Guide surface 473 Step portion 474 Mounting hole 475 Fastener mounting concave groove 476 Second convex ring 477 Mounting fastening hole 48 Lower seat 481 Powder discharge guide baffle ring 482 Mounting concave groove 51 Hopper cover bracket 511 Window 52 Cover plate 521 Bean input through hole 522 Guide plate 523 Gasket 524 Connecting portion 525 Connecting groove 526 Connecting sleeve 53 Bean dropping gap 54 Third ball plunger assembly 55 First positioning groove 56 Bean input opening 57 Arc-shaped cover 58 Slide groove 59 Second positioning groove 6 Motor mounting bracket 6-1 Inner support ring 6-2 Outer support ring 6-3 First connecting portion 6-4 Second connecting portion 6-5 Positioning block 6-6 Mounting plate 6-7 Positioning groove 6-8 Central through hole 6-9 Peripheral through hole 6 - 10 First Inclined Guide Surface 6 - 11 Avoidance Groove 6 - 12 Second Inclined Guide Surface 6 - 13 First Through - Hole 6 - 14 Second Through - Hole 6 - 15 Locking Block 6 - 16 Battery Mounting Concave Groove 6 - 17 Control Module Mounting Concave Groove 6 - 18 Dish Hole 6 - 19 Cable Wiring Groove 6 - 20 Protrusion Block 6 - 21 Large Circular Hole 6 - 22 Small Circular Hole 6 - 23 First Side Connection Plate 6 - 24 First Upper Side Connection Plate 6 - 25 First Lower Side Connection Plate 6 - 26 First Bottom Plate 6 - 27 First Reinforcing Rib 6 - 28 Gear Seat 6 - 29 Gear Shaft 6 - 30 First Guide Cone 6 - 31 Battery Stopper Piece 6 - 32 Charging Module Mounting Post 6 - 33 Charging Module Stopper Piece 6 - 34 Charging Module Positioning Post 6 - 35 Second Side Connection Plate 6 - 36 Second Upper Side Connection Plate 6 - 37 Second Lower Side Connection Plate 6 - 38 Second Bottom Plate 6 - 39 Second Reinforcing Rib 6 - 40 Connection Post 6 - 41 Second Guide Cone 6 - 42 Upper Control Module Stopper Piece 6 - 43 Middle Control Module Stopper Piece 6 - 44 Lower Control Module Stopper Piece 6 - 45 Control Module Vertical Stopper Piece 6 - 46 Upper Control Module Mounting Post 6 - 47 Lower Control Module Mounting Post 6 - 48 Battery Assembly 6-49 Control Module Assembly 6-50 Extension Piece 6-51 Elastic Contact Member 7 Powder Receiver Box 8 Zero Adjustment Nut

Claims

1. A high-precision externally adjustable coffee mill comprising a body housing (1), a grinding assembly including an inner grinding disk (32) and an outer grinding disk (31), and a roughness adjustment structure for adjusting the bean grinding gap of the grinding assembly, wherein the roughness adjustment structure comprises: An outer adjustment ring (2-2) that rotates relative to the body housing (1) and includes an internal gear ring (201); An inner drive ring (21) provided coaxially with the outer adjustment ring (2-2) and including an external gear ring (206); A transmission gear (22) that enables the internal gear ring (201) of the outer adjustment ring (2-2) to mesh with the external gear ring (202) of the inner drive ring (21); A lifting rod (33-2) that enables the inner drive ring (21) to drive the lifting of the inner grinding disk (32) or the outer grinding disk (31) of the grinding assembly to adjust the gap. A high-precision externally adjustable coffee mill is characterized by comprising the above components.

2. The high-precision externally adjustable coffee mill according to claim 1, characterized in that the reduction ratio of the outer adjustment ring (2-2) to the inner drive ring (21) is 1:1.4 or less.

3. The high-precision externally adjustable coffee mill according to claim 2, characterized in that the reduction ratio of the outer adjustment ring (2-2) to the inner drive ring (21) is 1:3 or more and 1:1.6 or less.

4. The outer adjustment ring (2-2) is provided in a fitting manner with the body housing (1), and adjustment graduations (23) are distributed in the circumferential direction. An attachment bracket (34) is provided in the body housing (1). A rolling groove (24) is provided in the outer adjustment ring (2-2). A first ball plunger assembly (25) that is rollably fitted with the rolling groove (24) is provided in the attachment bracket (34). The high-precision externally adjustable coffee mill according to claim 1 is characterized by the above structure.

5. The attachment bracket (34) is further provided with a second ball plunger assembly (26) that is fitted with the internal gear ring (201) or the stepped groove (27) of the outer adjustment ring (2-2). The stepped groove (27) is composed of a plurality of arc-shaped grooves (28) arranged in the circumferential direction. The high-precision externally adjustable coffee mill according to claim 4 is characterized by the above structure.

6. The lifting rod (33-2) is a drive sleeve rod (33-1) for driving the movement of the outer grinding disk (31) or the inner grinding disk (32) in the axial direction. An attachment bracket (34) is provided in the main body housing (1). The drive sleeve rod (33-1) is provided so as to be slidable with respect to the attachment bracket (34), and its rotation is restricted within the main body housing (1). The drive sleeve rod (33-1) is screw-connected to the inner drive ring (21). When the outer adjustment ring (2-2) drives the rotation of the inner drive ring (21), the drive sleeve rod (33-1) is driven to move up and down in the axial direction. The high-precision externally adjustable coffee mill according to claim 1, characterized in that.

7. A drive motor (35) is fixed to the attachment bracket (34). A connection shaft (36) is provided on the inner grinding disk (32). The output end of the drive motor (35) is connected to the connection shaft (36). The drive motor (35) drives the rotation of the connection shaft (36). A grinding disk bracket (4) is provided in the main body housing (1). The connection shaft (36) is sleeved on the grinding disk bracket (4) and is provided so as to be axially slidable with respect to the output end of the drive motor (35). One end of the drive sleeve rod (33-1) is fixedly connected to the connection shaft (36) in the axial direction. The high-precision externally adjustable coffee mill according to claim 6, characterized in that.

8. A biasing spring (39) is attached between the inner grinding disk (32) and the connection shaft (36). A flange is provided at the lower part of the connection shaft (36). The lower end surface of the flange, the upper end surface of the inner grinding disk (32), and the biasing spring (39) are in contact with each other. The high-precision externally adjustable coffee mill according to claim 7, characterized in that.

9. The drive sleeve rod (33-1) includes a connection seat (37), is connected to a connection shaft (36) through the connection seat (37), a first bearing (38) is provided on the connection seat (37), the connection shaft (36) is rotatably sleeved in the first bearing (38), a concave groove (361) with a circlip (362) fitted on the outer wall of the connection shaft (36) is provided, the circlip (362) abuts against the upper end surface of the first bearing (38) of the drive sleeve rod (36), a biasing spring (39) is sleeved on the connection shaft (36), one end of the biasing spring (39) abuts against the inner polishing disc (32), the other end abuts against the polishing disc bracket (4), and the biasing spring (39) provides a downward biasing force to the connection shaft (36). The high-precision externally adjustable coffee mill according to claim 7 is characterized in that.

10. Above the main body housing (1), a hopper cover bracket (51) with a penetrating bean input passage is provided. A cover plate (52) for closing the bean input passage, in which a bean input through hole (521) is formed, is connected to the hopper cover bracket (51). The hopper cover bracket (51) has a first height position and a second height position. When the cover plate (52) is in the first height position, a bean dropping gap (53) communicating with the bean input passage is formed between the bean input through hole (521) of the cover plate (52) and the hopper cover bracket (51). When the cover plate (52) is in the second height position, the bean input through hole (521) of the cover plate (52) abuts against the hopper cover bracket (51) to close the bean input passage. The high-precision externally adjustable coffee mill according to claim 4 is characterized in that.

11. The cover plate (52) is slidably connected to the hopper cover bracket (51). A slide groove (58) is provided on the cover plate (52) or the hopper cover bracket (51), and a slider is provided on the corresponding hopper cover bracket (51) or cover plate (52). The slide groove (58) is a linear groove extending in the axial direction or an inclined groove extending in a spiral shape. A second positioning groove (59) extends laterally at one end of the slide groove (58) close to the first height position. The high-precision externally adjustable coffee mill according to claim 10 is characterized in that.

12. The cover plate (52) is provided with a gasket (523) at the lower end of the bean input through hole (521). The material of the gasket (523) is a deformable elastic material. The cover plate (52) includes a guide plate (522) for covering the bean input passage. At the position of the bean input through hole (521) on the guide plate (522), a connecting portion (524) is bent inward and extended. A connecting groove (525) for fitting with the connecting portion (524) is provided on the gasket (523). The gasket (523) is connected to the connecting portion (524) through the connecting groove (525). The high-precision externally adjustable coffee mill according to claim 10 is characterized in that.

13. The grinding disk bracket (4) is integrally formed. The grinding disk bracket (4) is provided with an outer grinding disk mounting hole (41) and a connecting shaft mounting hole (42). Two second bearings (43) coaxially provided are provided in the connecting shaft mounting hole (42). The connecting shaft (36) is provided so as to pass through the second bearing (43). The high-precision externally adjustable coffee mill according to claim 7 is characterized in that.

14. The connecting shaft mounting hole (42) includes two bearing mounting positions (421). The hole wall of the bearing mounting position (421) and the hole wall of the connecting shaft mounting hole (42) are provided in a continuous straight line. The high-precision externally adjustable coffee mill according to claim 13 is characterized in that.

15. The grinding disk bracket (4) is made of metal, alloy material or plastic material. The alloy material includes aluminum alloy. The high-precision externally adjustable coffee mill according to claim 14 is characterized in that.

16. A positioning ring (44) is provided between the two second bearings (43). The high-precision externally adjustable coffee mill according to claim 13 is characterized in that.

17. One side of the outer grinding disk mounting hole (41) and the connecting shaft mounting hole (42) is formed by milling with a milling machine. The high-precision externally adjustable coffee mill according to claim 13 is characterized in that.

18. The grinding disk bracket (4) includes a lower mounting cylinder (47) and an upper mounting cylinder (45). The outer grinding disk mounting hole (41) is provided in the lower mounting cylinder (47), and the connecting shaft mounting hole (42) is provided in the upper mounting cylinder (45). The upper mounting cylinder (45) and the lower mounting cylinder (47) are connected via a connecting rib (46). A bean input passage communicating with the lower mounting cylinder (47) is formed between the plurality of connecting ribs (46). A first convex ring (471) extends on the upper end surface of the lower mounting cylinder (47), and a guide curved surface (472) smoothly inclined downward is formed on the upper end surface of the first convex ring (471) in the bean input passage. The high-precision externally adjustable coffee mill according to claim 17, characterized in that.

19. A lower seat (48) is provided at the lower end of the grinding disk bracket (4). A powder discharge guide baffle ring (481) is provided on the lower seat (48). The inner surface of the powder discharge guide baffle ring (481) is an arc surface that expands radially from top to bottom. An attachment concave groove (482) for connecting to the powder receiving box (7) is provided on the lower end surface of the lower seat (48). The attachment concave groove (482) is located at a position higher than the powder discharge guide baffle ring (481). The high-precision externally adjustable coffee mill according to claim 18, characterized in that.

20. The attachment bracket (34) is integrally formed. The attachment bracket (34) is fixedly connected to the grinding disk bracket (4). The drive sleeve rod (33-1) is provided to be axially slidable within the attachment bracket (34). The high-precision externally adjustable coffee mill according to claim 19, characterized in that.

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