CN220256290U - Bean grinding mechanism of coffee machine - Google Patents

Abstract

The utility model provides a coffee machine bean grinding mechanism, which comprises a base and an adjusting fluted disc rotatably arranged on the base, wherein a bean grinding cutter is connected in the adjusting fluted disc, an adjusting gear is arranged on the base, and the adjusting gear can be rotated to drive the adjusting fluted disc to rotate so as to drive the bean grinding cutter to move up and down to realize the adjustment of grinding thickness; the base is also provided with a limiting seat for accommodating the adjusting gear, a first limiting area and a second limiting area are arranged in the accommodating groove of the limiting seat, the upper end of the adjusting gear is provided with a positioning part, and the positioning part is limited in the first limiting area; the base is also provided with an adjusting component which can be used for driving the positioning part to enter the second limiting area in a clockwise or anticlockwise direction, so that the adjusting gear increases the rotation range in the clockwise or anticlockwise direction. The coffee machine bean grinding mechanism provided by the utility model can realize multi-stage adjustment of grinding thickness, and can also automatically select gear shifting according to the needs of a user so as to enlarge the grinding thickness range.

Description

Bean grinding mechanism of coffee machine

Technical Field

The utility model relates to the technical field of coffee machines, in particular to a coffee machine bean grinding mechanism.

Background

Along with the increase of domestic consumption of coffee-eliminating beverage, the requirements of people on the quality of coffee are also higher and higher, and the freshly ground coffee is widely welcome. When making freshly ground coffee, grinding the coffee beans is required, and the fineness of the grinding of the coffee beans directly influences the taste of the coffee.

The conventional coffee machine bean grinding unit is generally multi-stage adjustable in grinding thickness, and a user can select a coffee machine with a corresponding adjustable stage according to own preference. Since the existing coffee machine grinding thickness adjustment level is mostly set to be unchangeable when leaving the factory, for example, when a primary user selects a coffee machine with a small adjustment level (small adjustment range) and tries to use a grinding mechanism with more levels after a period of time, only a new coffee machine can be replaced, which increases the cost and causes resource waste to a certain extent.

Disclosure of Invention

The utility model solves the problem of overcoming at least one defect in the prior art, and provides a coffee machine bean grinding mechanism which can realize multi-stage adjustment of grinding thickness and can automatically select gear shifting according to the needs of a user so as to enlarge the grinding thickness range.

In order to solve the problems, the utility model provides a coffee machine bean grinding mechanism, which comprises a base connected to a main machine of the coffee machine and an adjusting fluted disc rotatably arranged on the base, wherein a cutter seat for installing a bean grinding cutter is in threaded fit with the adjusting fluted disc, an adjusting gear meshed with the adjusting fluted disc is arranged on the base, the adjusting fluted disc is synchronously driven to rotate by rotating the adjusting gear, and then the cutter seat is driven to drive the bean grinding cutter to move up and down so as to realize the adjustment of the grinding thickness of coffee beans, a limiting seat is further arranged on the base, a containing groove for containing the adjusting gear is arranged on the limiting seat, a first limiting area and a second limiting area are arranged in the containing groove, a positioning part is arranged on the end surface of the adjusting gear far away from the base, and the positioning part is limited in the first limiting area; the base is also provided with a gear shifting assembly which can be used for driving the positioning part to enter the second limiting area along the clockwise or anticlockwise direction, so that the rotation range of the adjusting gear is increased along the clockwise or anticlockwise direction, and the bean grinding mechanism is driven to obtain a wider grinding thickness adjusting range.

Compared with the prior art, the coffee machine bean grinding mechanism has the following advantages:

in the coffee machine bean grinding mechanism, the adjusting fluted disc is driven to rotate by rotating the adjusting gear, so that the base in the adjusting fluted disc is driven to move up and down, and the bean grinding cutter is synchronously driven to move up and down, so that the adjustment of the grinding thickness is realized, and the adjustment of different grades of the coffee bean thickness can be realized by controlling the ascending or descending stroke of the bean grinding cutter; more importantly, the bean grinding mechanism is also provided with the corresponding gear shifting assembly, the adjusting gears can be switched in different rotation adjusting ranges by operating the gear shifting assembly, specifically, two limiting areas are arranged on the limiting seat sleeved outside the adjusting gears, when the adjusting gears span into the second limiting area from the first limiting area, the expansion of thickness adjustment or fineness adjustment can be realized, and the bean grinding mechanism can obtain a wider grinding thickness adjusting range according to self selection.

As an improvement, the gear shifting assembly comprises a mounting shaft and an elastic reset piece, wherein the mounting shaft is vertically arranged on the base, the lower end of the adjusting gear is rotationally sleeved on the mounting shaft and can move up and down along the axial direction of the mounting shaft, and the upper end of the adjusting gear is provided with an adjusting rod; the elastic reset piece is arranged between the adjusting gear and the base, so that the adjusting gear always has an upward movement trend, and the positioning part is driven to be propped and limited in the first limiting area or the second limiting area. In the improved structure, when the range of the adjusting stage is required to be expanded, the adjusting rod is only required to be pressed and then rotated by a corresponding angle, so that the positioning part on the adjusting gear passes through one of the first limiting teeth to enter the second limiting region, the adjusting rod is loosened after the to-be-positioned part enters the second limiting region, and under the action of the elastic resetting piece, the positioning part can be abutted against the bottom plate of the accommodating groove in the second limiting region, so that the whole gear shifting structure is simple and convenient to operate.

Preferably, the elastic reset piece is a cylindrical spring, and the cylindrical spring is sleeved outside the mounting shaft. In the structure, the cylindrical spring is used as the elastic resetting piece, so that the device is convenient to install and can maintain stable elastic resetting force.

The bottom wall of the accommodating groove is provided with two first limiting teeth which are arranged at intervals along the circumferential direction, and the bottom wall of the accommodating groove is divided into a first limiting area and a second limiting area along the circumferential direction by the two first limiting teeth; when gear shifting is needed, the adjusting rod is axially pressed and rotated, so that the positioning part passes through one of the first limiting teeth to realize the switching of the limiting areas, then the external force acting on the adjusting rod is released, and the elastic reset piece is used for driving the positioning part to abut against the bottom wall of the corresponding limiting area on the accommodating groove. In the improved structure, the two limiting areas are divided at the bottom of the accommodating groove of the limiting seat through the two first limiting teeth, so that the structure is simple, and gear shifting operation is convenient.

The bottom wall of the accommodating groove is further provided with a second limiting tooth positioned in the middle of the second limiting area, and the height of the second limiting tooth is higher than that of the first limiting tooth; the second limiting teeth are used for dividing the second limiting area into a first expanding area and a second expanding area. In the improved structure, the second limiting area is further divided into two independent expansion areas, the adjusting range is increased, meanwhile, the adjusting range is not too large, the risk of disengaging the bean grinding cutter is caused, the number of stages of the adjusting range is too small, the grinding clearance is too small, and bean discharging is affected.

And when the adjusting gear drives the positioning part to rotate along clockwise crossing the first limiting tooth to be close to the second limiting tooth or the positioning part to rotate along anticlockwise crossing the first limiting tooth to be close to the second limiting tooth, the second limiting lug and the first limiting lug are propped against and limited. In the improved structure, through the arrangement of the two limiting convex teeth, the position limitation of the adjusting gear after the adjusting gear passes through the corresponding first limiting tooth clockwise or anticlockwise is realized, and the influence on the normal use of the bean grinding mechanism caused by the fact that the rotation angle of the adjusting gear exceeds a set value is avoided.

Still be provided with the beans case on the coffee machine host computer and be located the top of base, be provided with the installation through-hole on the diapire of beans case, the upper end of adjusting the pole wear out in the installation through-hole. In the improved structure, the adjusting rod is arranged on the bottom plate of the bean box, so that gear shifting is convenient to adjust.

The improved structure is characterized in that an adjusting knob is inserted into the mounting through hole, the adjusting knob is provided with a fitting hole which is penetrated along the axial direction of the adjusting knob, and the inner wall of the lower end of the fitting hole is of a polygonal structure; the outer wall of the adjusting rod is provided with a driving section matched with the assembling hole of the polygonal part, and the adjusting rod can move up and down in the assembling. Among the above-mentioned improvement structure, adjust knob sets up the rotation of more convenient adjusting gear and adjusts the level to the appearance aesthetic measure is better.

Still further, the top of adjusting the pole is connected with presses the roof, just press the roof holding in the upper end of joining in marriage the dress hole. In the improved structure, in the initial state, the upper end face of the pressing plate is flush with the upper end face of the adjusting knob, so that the attractive appearance is maintained.

And the bean box bottom plate is provided with a mounting sleeve at a position corresponding to the mounting through hole, and the adjusting knob is inserted and assembled in the mounting sleeve. In the improved structure, the installation sleeve is more convenient for the installation of the adjusting knob after being arranged, and the attractive appearance is better.

Drawings

FIG. 1 is a schematic view showing a half-section structure of a coffee machine bean grinding mechanism of the present utility model;

FIG. 2 is a schematic diagram of an exploded view of a coffee grinder mechanism of the present utility model;

FIG. 3 is a schematic diagram of a limiting seat according to the present utility model;

FIG. 4 is a schematic diagram of the structure of an adjusting gear in the present utility model;

fig. 5 is an enlarged schematic view of the structure at X in fig. 1.

Reference numerals illustrate:

1. a base; 2. adjusting the fluted disc; 3. a tool apron; 4. an adjusting gear; 5. a limit seat; 6. a receiving groove; 7. a first limit region; 8. the second limit area; 9. a positioning part; 10. a mounting shaft; 11. an elastic reset piece; 12. an adjusting rod; 13. the first limiting teeth; 14. the second limiting teeth; 15. a first expansion area; 16. a second expansion area; 17. the second limit bump; 18. a first limit bump; 19. a bean box; 20. mounting through holes; 21. an adjustment knob; 22. a fitting hole; 23. pressing the top plate; 24. installing a sleeve; 25. a grinding chamber; 26. a driving motor; 27. grinding bean knife; 28. a spring positioning column; 29. a plug-in hole; 30. the through hole is operated.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "bottom", "lower", "upper", "inner wall", "outer wall", "bottom wall" and the like are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and defined otherwise, the term "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1 and 2, the utility model provides a coffee machine bean grinding mechanism, which comprises a base 1 connected to a main machine of the coffee machine and an adjusting fluted disc 2 rotatably arranged on the base 1, wherein a cutter holder 3 for installing a bean grinding cutter 27 is in threaded fit in the adjusting fluted disc 2, specifically, a spiral claw is arranged on the outer wall of the cutter holder 3, a thread groove is arranged on the inner wall of the adjusting fluted disc 2, the cutter holder 3 is in threaded fit in the corresponding thread groove through the claw, and when the fluted disc rotates, the bean grinding cutter 27 can be driven to move upwards or downwards so as to realize the adjustment of the thickness of ground coffee powder; in addition, a corresponding grinding cavity 25 is provided on the base 1, the bean grinding knife 27 is vertically disposed in the grinding cavity 25, and a driving motor 26 for driving the bean grinding knife 27 to rotate is provided on the base 1.

In addition, an adjusting gear 4 meshed with the adjusting fluted disc 2 is arranged on the base 1, and the adjusting fluted disc 2 is synchronously driven to rotate by rotating the adjusting gear 4, so that the cutter holder 3 is driven to drive the bean grinding cutter 27 to move up and down, and the adjustment of the grinding thickness of the coffee beans is realized; on the other hand, as shown in fig. 1 and 2, a limiting seat 5 is further provided on the base 1, a containing groove 6 for containing the adjusting gear 4 is provided on the limiting seat 5, a first limiting area 7 and a second limiting area 8 are provided in the containing groove 6, a positioning portion 9 is provided on an end surface of the adjusting gear 4 far from the base 1, and the positioning portion 9 is limited in the first limiting area 7, in this embodiment, the positioning portion 9 is a positioning convex tooth formed on an upper end surface of the adjusting gear 4 in a protruding manner; the base 1 is further provided with a gear shifting assembly capable of driving the positioning part 9 to enter the second limiting area 8 in a clockwise or anticlockwise direction, so that the rotation range of the adjusting gear 4 is increased in the clockwise or anticlockwise direction, and the bean grinding mechanism is driven to obtain a wider grinding thickness adjusting range. In this structure, in the initial state, the positioning portion 9 is limited in the first limiting area 7, and in this area, the adjusting gear 4 can only rotate by a corresponding angle, that is, the bean grinding mechanism can only perform the adjustment of the number of steps of thickness in a corresponding range. When the coffee grinder is used for grinding coffee beans with coarser or finer orders, the positioning part 9 is driven to enter the second limit area 8 along the corresponding direction by the gear shifting assembly.

In this embodiment, the gear shifting assembly includes a mounting shaft 10 and an elastic reset member 11, the mounting shaft 10 is vertically disposed on the base 1, the lower end of the adjusting gear 4 is rotatably sleeved on the mounting shaft 10 and can move up and down along the axial direction thereof, and the upper end of the adjusting gear 4 is provided with an adjusting rod 12; the elastic reset piece 11 is arranged between the adjusting gear 4 and the base 1, so that the adjusting gear 4 always has a trend of upward movement, and the positioning part 9 is driven to be abutted and limited in the first limiting area 7 or the second limiting area 8. Preferably, the elastic restoring member 11 is a cylindrical spring, and the cylindrical spring is sleeved outside the mounting shaft 10. More specifically, a spring positioning column 28 is formed at the upper end of the installation shaft 10, the diameter of the spring positioning column 28 is smaller than that of the installation shaft 10, a plug-in hole 29 is formed at the lower end of the adjusting gear 4, the inner diameter of the plug-in hole 29 is matched with that of the installation shaft 10, namely, when the lower end of the adjusting gear 4 is sleeved on the installation shaft 10, a containing cavity for containing a spring is formed between the spring positioning column 28 and the inner wall of the plug-in hole 29; the spring is sleeved outside the spring positioning column 28, and the upper end and the lower end of the spring are respectively abutted against the bottom of the inserting hole 29 and the top of the mounting shaft 10, so that the hidden mounting of the spring is realized, as shown in fig. 5.

On the other hand, in the structure, two first limiting teeth 13 are arranged on the bottom wall of the accommodating groove 6 at intervals along the circumferential direction, and the bottom wall of the accommodating groove 6 is divided into a first limiting area 7 and a second limiting area 8 along the circumferential direction by the two first limiting teeth 13; when gear shifting is needed, after the adjusting rod 12 is axially pressed and rotated to enable the positioning part 9 to pass through the corresponding first limiting tooth 13 in the clockwise or anticlockwise direction to realize the switching of the limiting areas, the external force acting on the adjusting rod 12 is released, and under the action of the elastic reset piece 11, the positioning part 9 is abutted against the bottom wall of the corresponding limiting area on the accommodating groove 6 again.

As shown in fig. 3, a second limiting tooth 14 is further arranged on the bottom wall of the accommodating groove 6 and located in the middle of the second limiting area 8; the second limiting tooth 14 serves to divide the second limiting area 8 into a first expansion area 15 and a second expansion area 16. Specifically, the first expansion area 15 is used as the expansion extension of the first limit area 7 for adjusting the space in the clockwise direction, and the second expansion area 16 is used as the expansion extension of the first limit area 7 for adjusting the space in the anticlockwise direction, so that the expansion adjustment of grinding thickening or thinning is realized, namely, the thickness adjustment of more steps is added on the basis of the adjustment of the original first limit area 7, so that the requirements of different customers are better met; in addition, in the structure, the second limiting area 8 is divided into two parts, namely, one part is used as an expansion of thickness adjustment, the other part is used as an expansion of thickness adjustment, the adjustment range is increased, meanwhile, too large adjustment range is avoided, the risk of removing the bean grinding cutter 27 due to too large movement position is avoided, and the grinding clearance is too small due to too small number of stages of the adjustment range, so that bean feeding is affected.

In the above structure, as shown in fig. 2 and 4, a first limit bump 18 is disposed at a position on the base 1 near the mounting shaft 10, and a second limit bump 17 is disposed at a lower end surface of the adjusting gear 4, when the adjusting gear 4 drives the positioning portion 9 to rotate clockwise to get close to the second limit tooth 14 beyond the first limit tooth 13 or drives the positioning portion 9 to rotate counterclockwise to get close to the second limit tooth 14 beyond the first limit tooth 13, the second limit bump 17 abuts against the first limit bump 18 to limit, so that the positioning portion 9 is prevented from rotating beyond the adjusting gear 4 beyond the second limit tooth 14 clockwise or counterclockwise, and the bean grinding cutter 27 is prevented from being separated from the tool apron 3 or the grinding gap is too small to be used, thereby affecting use.

As shown in fig. 1, a bean box 19 is further arranged above the base 1 on the coffee machine main body, a mounting through hole 20 is arranged on the bottom wall of the bean box 19, and the upper end of the adjusting rod 12 penetrates through the mounting through hole 20. An adjusting knob 21 is inserted into the mounting through hole 20, an assembling hole 22 which is penetrated along the axial direction of the adjusting knob 21 is formed in the adjusting knob 21, and the inner wall of the lower end of the assembling hole 22 is of a polygonal structure; the outer wall of the adjustment lever 12 is provided with a driving section that matches the fitting hole 22 of the polygonal portion, and the adjustment lever 12 can be moved up and down in the fitting. When the adjusting knob 21 is manually rotated, the adjusting rod 12 is driven to rotate under the action of the polygonal driving section, so that the rotation of the adjusting gear 4 is realized; when the grinding thickness level is required to be expanded, the adjusting rod 12 is pressed down and then the adjusting knob 21 is rotated at the same time, so that the expansion of the grinding thickness range can be realized after the positioning part 9 on the adjusting gear 4 passes over the corresponding first limiting tooth 13. More specifically, a pressing top plate 23 is connected to the top of the adjusting rod 12, and the pressing top plate 23 is accommodated at the upper end of the fitting hole 22, and in the initial state, the upper end surface of the pressing top plate 23 is flush with the upper end surface of the adjusting knob 21, so that the aesthetic property is maintained. In the above structure, the adjusting knob 21 is arranged on the bottom wall of the bean box 19, and the later adjusting operation is more convenient because the adjusting knob is not arranged inside the coffee machine. A mounting sleeve 24 is formed on the bottom plate of the bean box 19 at a position corresponding to the mounting through hole 20, and the adjusting knob 21 is inserted and fitted in the mounting sleeve 24.

In other embodiments, the pressing top plate 23 may be fixedly connected with the adjusting knob 21, and the upper end surface of the pressing top plate 23 is kept flush with the upper end surface of the adjusting knob 21; an operation through hole 30 is formed in the middle of the pressing top plate 23, when gear shifting adjustment is needed, a user needs to drive the adjusting rod 12 to move downwards through the operation through hole 30 by means of another rod-shaped tool, and meanwhile, the adjusting knob 21 is rotated to realize gear shifting expansion of an adjusting range; the design has the advantages that the difficulty of adjusting is increased, the frequency of adjusting by a user can be reduced, and the grinding effect is easy to be reduced due to the fact that the number of times of self-adjusting by the user is too high.

Although the present disclosure is disclosed above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the disclosure.

Claims (10)

1. The utility model provides a coffee machine grinds beans mechanism, it is including connecting base (1) and the rotation setting on coffee machine host computer are in adjust fluted disc (2) on base (1), adjust fluted disc (2) female screw fit have blade holder (3) that are used for installing and grind beans sword (27), be provided with on base (1) with adjust fluted disc (2) engaged adjusting gear (4), through the rotation adjusting gear (4) synchronous drive adjust fluted disc (2) rotation, and then order about blade holder (3) drive grind beans sword (27) and reciprocate to realize the regulation of coffee bean grinding thickness, its characterized in that: the base (1) is also provided with a limiting seat (5), the limiting seat (5) is provided with a containing groove (6) for containing the adjusting gear (4), a first limiting area (7) and a second limiting area (8) are arranged in the containing groove (6), the end face, far away from the base (1), of the adjusting gear (4) is provided with a positioning part (9), and the positioning part (9) is limited in the first limiting area (7); the base (1) is further provided with a gear shifting assembly which can be used for driving the positioning part (9) to enter the second limiting area (8) along the clockwise or anticlockwise direction, so that the rotation range of the adjusting gear (4) is increased along the clockwise or anticlockwise direction, and the bean grinding mechanism is driven to obtain a wider grinding thickness adjusting range.

2. The coffee machine beans grinding mechanism of claim 1, wherein: the gear shifting assembly comprises a mounting shaft (10) and an elastic reset piece (11), the mounting shaft (10) is vertically arranged on the base (1), the lower end of the adjusting gear (4) is rotatably sleeved on the mounting shaft (10) and can move up and down along the axial direction of the mounting shaft, and an adjusting rod (12) is arranged at the upper end of the adjusting gear (4); the elastic reset piece (11) is arranged between the adjusting gear (4) and the base (1), so that the adjusting gear (4) always has a trend of upward movement, and the positioning part (9) is driven to be propped and limited in the first limiting area (7) or the second limiting area (8).

3. A coffee machine bean grinding mechanism as claimed in claim 2, wherein: the elastic reset piece (11) is a cylindrical spring, and the cylindrical spring is sleeved outside the installation shaft (10).

4. A coffee machine bean grinding mechanism as claimed in claim 2, wherein: two first limiting teeth (13) are arranged on the bottom wall of the accommodating groove (6) at intervals along the circumferential direction, and the bottom wall of the accommodating groove (6) is divided into a first limiting region (7) and a second limiting region (8) along the circumferential direction by the two first limiting teeth (13); when gear shifting is needed, the adjusting rod (12) is axially pressed and rotated, so that the positioning part (9) passes through one of the first limiting teeth (13) to realize the switching of the limiting areas, then the external force acting on the adjusting rod (12) is released, and the elastic reset piece (11) is used for driving the positioning part (9) to abut against the bottom wall of the corresponding limiting area on the accommodating groove (6).

5. The coffee machine beans grinding mechanism as recited in claim 4, wherein: the bottom wall of the accommodating groove (6) is positioned in the middle of the second limiting area (8), second limiting teeth (14) are further arranged on the bottom wall of the accommodating groove, and the second limiting teeth (14) are used for dividing the second limiting area (8) into a first expansion area (15) and a second expansion area (16).

6. The coffee machine beans grinding mechanism as recited in claim 5, wherein: the position on the base (1) near the installation shaft (10) is provided with a first limit lug (18), the lower end face of the adjusting gear (4) is provided with a second limit lug (17), when the adjusting gear (4) drives the positioning part (9) to rotate along clockwise passing through a first limit tooth (13) to be close to a second limit tooth (14) or the positioning part (9) rotates along anticlockwise passing through the first limit tooth (13) to be close to the second limit tooth (14), the second limit lug (17) and the first limit lug (18) are propped against to be limited.

7. Coffee machine grinding mechanism according to any one of claims 2 to 6, characterized in that: the coffee machine is characterized in that a bean box (19) is further arranged above the base (1) on the coffee machine main machine, an installation through hole (20) is formed in the bottom wall of the bean box (19), and the upper end of the adjusting rod (12) penetrates through the installation through hole (20).

8. The coffee machine beans grinding mechanism as recited in claim 7, wherein: an adjusting knob (21) is inserted into the mounting through hole (20), a fitting hole (22) which is penetrated along the axial direction of the adjusting knob (21) is formed in the adjusting knob, and the inner wall of the lower end of the fitting hole (22) is of a polygonal structure; the outer wall of the adjusting rod (12) is provided with a driving section matched with the fitting hole (22) of the polygonal part, and the adjusting rod (12) can move up and down in the fitting.

9. The coffee machine beans grinding mechanism of claim 8, wherein: the top of the adjusting rod (12) is connected with a pressing top plate (23), and the pressing top plate (23) is accommodated at the upper end of the assembling hole (22).

10. The coffee machine beans grinding mechanism of claim 8, wherein: and a mounting sleeve (24) is formed at a position, corresponding to the mounting through hole (20), on the bottom plate of the bean box (19), and the adjusting knob (21) is inserted and assembled in the mounting sleeve (24).