Coffee grinding centrifugal grading and screening device

Abstract

This utility model discloses a centrifugal grading and sieving device for coffee grinding, relating to the technical field of coffee grinding devices. It has the advantage of sieving ground coffee particles to facilitate the selection of coffee particles of suitable coarseness. The key technical points are: it includes an outer cylinder with a hollow inner cavity, a circular hole at the middle of the top of the outer cylinder, an inner cylinder with a closed circular hole and a funnel shape fixed at the top of the outer cylinder, the bottom end of the inner cylinder entering the inner cavity of the outer cylinder, and a material leakage hole connecting the inner cavity of the inner cylinder and the inner cavity of the outer cylinder penetrating through the bottom end of the inner cylinder entering the inner cavity of the outer cylinder, an annular fixed cutter disc adapted to the inner cylinder is detachably fixed to the inner cavity wall, and a conical moving cutter disc adapted to the annular fixed cutter disc is rotatably connected to the bottom of the inner cavity, with the top of the conical moving cutter disc extending into the annular fixed cutter disc.

Description

Technical Field

[0001] This utility model relates to the technical field of coffee grinding devices, specifically a centrifugal force grading and sieving device for coffee grinding. Background Technology

[0002] Coffee beans cannot be brewed directly; they must first be ground into powder before they can be brewed into drinkable coffee. As a crucial step in the coffee-making process, the coffee grinder is an essential tool for producing high-quality coffee. Through fine processing, it grinds coffee beans into powder suitable for different brewing methods. The degree of grind directly affects the extraction efficiency and final taste of the coffee. An overly coarse grind will result in under-extraction and a weak coffee flavor; while an overly fine grind may lead to over-extraction and a bitter taste.

[0003] Traditional coffee grinders use a hand crank or hand press to drive a conical moving burr to rotate. The rotating conical moving burr works in conjunction with a ring-shaped fixed burr to grind the coffee beans by rolling. The coffee powder has a granular appearance. However, this type of coffee grinder grinds coffee beans by rolling, which easily produces more fine powder. This fine powder can easily lead to uneven extraction during brewing, affecting the taste of the coffee. Summary of the Invention

[0004] To address the aforementioned technical shortcomings, the purpose of this invention is to provide a centrifugal grading and sieving device for coffee grinding, which has the advantage of sieving ground coffee particles to facilitate the selection of coffee particles of suitable coarseness.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This utility model provides a centrifugal grading and sieving device for coffee grinding, including a hollow outer cylinder with a circular hole at the top center. A funnel-shaped inner cylinder with a closed circular hole is fixed to the top of the outer cylinder. The bottom end of the inner cylinder enters the inner cavity of the outer cylinder. A material leakage hole connecting the inner and outer cylinders is passed through the bottom end of the inner cylinder entering the outer cylinder's inner cavity. An annular fixed cutter disc adapted to the inner cylinder is detachably fixed to the inner cavity wall. A conical moving cutter disc adapted to the annular fixed cutter disc is rotatably connected to the bottom of the inner cavity. The top of the conical moving cutter disc extends into the annular fixed cutter disc. A drive shaft coaxially fixed to the conical moving cutter disc passes through the conical moving cutter disc. The top and bottom ends of the drive shaft extend out of the conical moving cutter disc, and the bottom end extending out of the conical moving cutter disc extends out of the inner cylinder and is rotatably connected to it. The inner cavity of the outer cylinder is provided with a collection component for collecting and sieving coffee powder leaking through the material leakage hole.

[0007] By adopting the above technical solution, the outer cylinder supports and accommodates the inner cylinder and the collecting component. The inner cylinder is detachably fixed to the outer cylinder. Coffee beans are placed inside the annular fixed cutter disc. The rotating drive shaft provides power, driving the conical moving cutter disc, which is coaxially fixed with the drive shaft, to rotate. The rotation of the conical moving cutter disc causes the coffee beans to enter the gap between the conical moving cutter disc and the annular fixed cutter disc and be ground by them. The ground coffee powder falls into the inner cavity of the inner cylinder under the action of gravity through the bottom gap between the conical moving cutter disc and the annular fixed cutter disc, and then leaks out of the inner cylinder through the discharge hole. The combination of the inner cylinder, the annular fixed cutter disc, and the conical moving cutter disc is existing technology, so it will not be described in detail here. By setting a collecting component in the inner cavity of the outer cylinder, the coffee powder leaking out of the inner cylinder can be collected, and the collected coffee powder can be sieved for easy use. Fine powder is removed, and oversized particles are reground. Suitable coffee particles are selected for brewing to improve the taste of the coffee.

[0008] Preferably, the collection assembly includes several collection trays disposed in the inner cavity of the outer cylinder. The inner cavity of the collection tray is hollow and open at the top. Except for the bottommost collection tray, the bottom of each collection tray is provided with a screening groove. Each collection tray is fixed with a screen covering the screening groove. The screen aperture gradually decreases from top to bottom. The top and bottom of the outer circumference of each collection tray are integrally provided with a first annular connecting plate. Every two adjacent first annular connecting plates are detachably fixedly connected by several bolts.

[0009] Preferably, the inner cavity of the outer cylinder is also provided with a corrugated telescopic sleeve. The upper and lower ends of the outer wall of the corrugated telescopic sleeve are fixed with second annular connecting plates. The first annular connecting plate and the second annular connecting plate are the same size. The corrugated telescopic sleeve is sleeved on the outside of the inner cylinder. The second annular connecting plate at the top is detachably fixed to the top of the inner cavity groove of the outer cylinder by bolts. The second annular connecting plate at the bottom is detachably fixed to the first annular connecting plate at the top by bolts.

[0010] Preferably, the inner cylinder is provided with a vibration assembly that controls the shaking of several collection discs to improve screening efficiency.

[0011] Preferably, the vibration assembly includes a long rod fixedly connected to one end of the drive shaft extending out of the inner cylinder. A vertical rod is movably connected to the end of the long rod away from the drive shaft. Two opposing connecting rods are fixed to both sides of the bottom end of the vertical rod. A cross rod is fixed to the bottom end of the two connecting rods. The two ends of the cross rod that are fixed to the connecting rods are fixed to the inner wall of the collection tray at the top. The two ends that are not fixed to the connecting rods are fixedly connected to the lower support rod. The end of the lower support rod away from the cross rod is detachably fixed to the upper support rod by bolts. The end of the upper support rod away from the lower support rod is fixed to the outer wall of the inner cylinder.

[0012] Preferably, the bottom of the inner cavity of the outer cylinder is provided with several buffer components that cooperate with the collection tray located at the bottom end to buffer and limit its movement.

[0013] Preferably, the buffer assembly includes a lower support that is detachably and fixedly connected to the bottom of the inner cavity of the outer cylinder, an elastic buffer column is fixedly fixed to the top of the lower support, an upper support is provided directly above the lower support, a spring is fixed between the lower support and the lower support and sleeved on the elastic buffer column, and several of the upper supports are fixed to a third annular connecting plate, and the third annular connecting plate is detachably and fixedly connected to the second annular connecting plate located at the bottom end by bolts.

[0014] The beneficial effects of this utility model are as follows: the outer cylinder supports and accommodates the inner cylinder and the collecting component. The inner cylinder is detachably fixed to the outer cylinder. Coffee beans are placed in the annular fixed cutter disc. The rotating drive shaft provides power to drive the conical moving cutter disc, which is fixed coaxially with the drive shaft, to rotate. The rotation of the conical moving cutter disc causes the coffee beans to enter the gap between the conical moving cutter disc and the annular fixed cutter disc and be ground by them. The ground coffee powder falls into the inner cavity of the inner cylinder under the action of gravity through the bottom gap between the conical moving cutter disc and the annular fixed cutter disc, and then leaks out of the inner cylinder through the leakage hole. The combination of the inner cylinder, the annular fixed cutter disc, and the conical moving cutter disc is existing technology, so it will not be described in detail here. By setting a collecting component in the inner cavity of the outer cylinder, it is convenient to collect the coffee powder that leaks out of the inner cylinder and to sieve the collected coffee powder for easy use. Fine powder is removed, and oversized particles are reground. Suitable coffee particles are selected for brewing to improve the taste of the coffee. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this embodiment;

[0017] Figure 2 This is a schematic diagram illustrating the structure of the corrugated expansion sleeve in this embodiment;

[0018] Figure 3 This is a schematic diagram illustrating the structure of the collection tray in this embodiment;

[0019] Figure 4 This is a schematic diagram illustrating the structure of the material leakage hole in this embodiment;

[0020] Figure 5 This is a structural schematic diagram illustrating the long rod in this embodiment;

[0021] Figure 6This is a schematic diagram illustrating the structure of the cross bar in this embodiment;

[0022] Figure 7 This embodiment Figure 3 Enlarged structural diagram at point A in the middle.

[0023] Explanation of reference numerals in the attached figures:

[0024] In the diagram: 1. Outer cylinder; 101. Top plate; 102. Bottom plate; 103. Front side plate; 104. Rear side plate; 105. Left side plate; 106. Right side plate; 2. Inner cylinder; 201. Discharge hole; 3. Annular fixed cutter head; 4. Conical moving cutter head; 5. Drive shaft; 6. Collection assembly; 601. Collection tray; 602. First annular connecting plate; 603. Screen; 7. Corrugated telescopic sleeve; 701. Second... 8. Annular connecting plate; 9. Vibration assembly; 10. Long rod; 11. Vertical rod; 12. Connecting rod; 13. Cross rod; 14. Lower support rod; 15. Upper support rod; 16. Buffer assembly; 17. Lower support; 18. Elastic buffer column; 19. Upper support; 20. Spring; 10. Third annular connecting plate; 11. Ear plate; 12. Fixed cover; 13. Movable cover; 14. Crank handle. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Coffee grinding centrifugal grading and sieving device, such as Figure 1-7 The device includes a hollow outer cylinder 1, which is composed of a top plate 101, a bottom plate 102, a front side plate 103, a rear side plate 104, a left side plate 105, and a right side plate 106 that cooperate with each other. The left side plate 105 and the right side plate 106 have several slots on both sides. The front side plate 103 and the rear side plate 104 have several locking blocks that correspond one-to-one with the slots on both sides. The front side plate 103 and the rear side plate 104 are fastened and fixed to the adjacent left side plate 105 and right side plate 106 by the slots and locking blocks. The outer walls of the front side plate 103, the rear side plate 104, the left side plate 105, and the right side plate 106 are all fixed with handles. The top plate 101 and the bottom plate 102 are fixed to the rear side plate 104, the left side plate 105, and the right side plate 106 by screws.

[0027] like Figure 1 and Figure 2 and Figure 3 and Figure 4A circular hole is provided at the middle of the top of the top plate 101. An inner cylinder 2 with a closed circular hole and a funnel shape is fixed to the top plate 101. The bottom end of the inner cylinder 2 enters the inner cavity of the outer cylinder 1. The bottom end of the inner cylinder 2 entering the inner cavity of the outer cylinder 1 has a material leakage hole 201 that connects the inner cavity of the inner cylinder 2 and the inner cavity of the outer cylinder 1. An annular fixed cutter disc 3 adapted to the inner cylinder 2 is detachably fixed to the inner cavity wall. A conical moving cutter disc 4 adapted to the annular fixed cutter disc 3 is rotatably connected to the bottom of the inner cavity of the inner cylinder 2. The top of the conical moving cutter disc 4 extends into the annular fixed cutter disc 3. A drive shaft 5 coaxially fixed to the conical moving cutter disc 4 passes through the conical moving cutter disc 4. The top and bottom ends of the drive shaft 5 both pass out of the conical moving cutter disc 4. The bottom end of the drive shaft 5 passes out of the inner cylinder 2 and is rotatably connected to the inner cylinder 2.

[0028] like Figure 1 and Figure 2 and Figure 3 and Figure 4 A top plate 10 with an inverted C-shaped cross-section is fixed to the top of the top plate 101, located outside the circular hole. A fixed cover 11 is fixed to one side of the lower surface of the ear plate 10, and a movable cover 12 is rotatably connected to the other side. The movable cover 12 is detachably connected to the ear plate 10 by screws. The fixed cover 11 and the movable cover 12 are the same size and arranged opposite each other. The bottom end of the fixed cover 11 is fixed to the upper surface of the top plate 101, and the bottom end of the movable cover 12 is attached to the upper surface of the top plate 101. When both the fixed cover 11 and the movable cover 12 are fixedly connected to the ear plate 10, the fixed cover 11 and the movable cover 12 close the annular fixed cutter disc 3, reducing the possibility of dirt and dust entering the annular fixed cutter disc 3 or coffee beans falling from the top of the annular fixed cutter disc 3. The drive shaft 5 passes through the top of the conical moving cutter disc 4, passes through the ear plate 10, and is rotatably connected to the ear plate 10. A crank handle 13 is fixed to one end of the drive shaft 5 that passes through the ear plate 10.

[0029] like Figure 1 and Figure 2 and Figure 3 and Figure 4 The outer cylinder 1 supports and accommodates the inner cylinder 2 and the collecting component 6. The inner cylinder 2 is detachably fixed to the outer cylinder 1. Coffee beans are placed in the annular fixed blade 3. The crank handle 13 is manually rotated to provide power, which drives the conical moving blade 4, which is coaxially fixed with the drive shaft 5, to rotate. The rotation of the conical moving blade 4 causes the coffee beans to enter the gap between the conical moving blade 4 and the annular fixed blade 3 and be ground by the conical moving blade 4 and the annular fixed blade 3. The ground coffee powder falls into the inner cavity of the inner cylinder 2 through the bottom gap between the conical moving blade 4 and the annular fixed blade 3 under the action of gravity, and is discharged from the inner cylinder 2 through the discharge hole 201. The combination of the inner cylinder 2, the annular fixed blade 3, and the conical moving blade 4 is existing technology, so it will not be described in detail here.

[0030] like Figure 1 and Figure 2 and Figure 3 and Figure 4In order to collect and sieve the coffee powder leaking out of the inner cylinder 2 through the leakage hole 201, the inner cavity of the outer cylinder 1 is provided with a collection component 6 for collecting and sieving the coffee powder leaking out of the leakage hole 201.

[0031] like Figure 2 and Figure 3 and Figure 4 and Figure 5 The collection assembly 6 includes several collection trays 601 disposed in the inner cavity of the outer cylinder 1. The collection trays 601 are stacked vertically. The inner cavity of the collection trays 601 is hollow and open at the top. Except for the bottommost collection tray, the bottom of each collection tray 601 is provided with a screening groove. Each collection tray 601 is fixed with a screen 603 covering the screening groove. The aperture of the screen 603 gradually decreases from top to bottom. The top and bottom of the outer circumference of each collection tray 601 are integrally provided with a first annular connecting plate 602. The upper surface of the first annular connecting plate 602 located on the upper side is flush with the upper surface of the collection tray 601, and the upper surface of the first annular connecting plate 602 located on the lower side is flush with the lower surface of the collection tray 601. Every two adjacent first annular connecting plates 602 are detachably fixedly connected by several bolts.

[0032] like Figure 2 and Figure 3 and Figure 4 and Figure 5 The coffee powder leaking out of the discharge hole 201 directly enters the top collection tray 601 and passes through the sieve 603 into the next collection tray 601, which facilitates the collection of coffee powder and sieves the leaked coffee powder at the same time.

[0033] like Figure 2 and Figure 3 and Figure 4 and Figure 5 To ensure that all coffee powder leaking through the discharge hole 201 directly enters the top collection tray 601, a corrugated telescopic sleeve 7 is also provided in the inner cavity of the outer cylinder 1. The corrugated telescopic sleeve 7 has a certain elasticity, and the shaking of the collection tray 601 will not cause it to be damaged. The upper and lower ends of the outer wall of the corrugated telescopic sleeve 7 are fixed with second annular connecting plates 701. The first annular connecting plate 602 and the second annular connecting plate 701 are the same size. The corrugated telescopic sleeve 7 is sleeved on the outer cylinder 2. The second annular connecting plate 701 at the top is detachably fixed to the top of the inner cavity of the outer cylinder 1 by bolts. The second annular connecting plate 701 at the bottom is detachably fixed to the first annular connecting plate 602 at the top by bolts. By setting the corrugated telescopic sleeve 7, the efficiency of collecting coffee powder and screening it is improved.

[0034] like Figure 2 and Figure 3 and Figure 4 and Figure 5 and Figure 6 To improve the sieving efficiency of coffee powder, the inner cylinder 2 is equipped with a vibration assembly 8 that controls the shaking of several collection trays 601 to improve sieving efficiency. The vibration assembly 8 includes a long rod 801 fixedly connected to one end of the drive shaft 5 that extends out of the inner cylinder 2. A vertical rod 802 is movably connected to the end of the long rod 801 away from the drive shaft 5. Two opposing connecting rods 803 are fixed on both sides of the bottom end of the vertical rod 802. A cross rod 804 is fixed to the bottom end of the two connecting rods 803. The center line of the cross rod 804 coincides with the center line of the collection tray 601. The cross rod 804 and the cross rod 804 are... The two ends of the connecting rod 803 are fixed to the inner wall of the collection tray 601 located at the top, and the two ends not fixed to the connecting rod 803 are fixedly connected to the lower support rod 805. The two ends of the cross rod 804 that are not fixed to the connecting rod 803 are not connected to the collection tray 601. The end of the lower support rod 805 away from the cross rod 804 is detachably fixed to the upper support rod 806 by bolts. The end of the upper support rod 806 away from the lower support rod 805 is fixed to the outer wall of the inner cylinder 2. The upper support rod 806 and the lower support rod 805 are detachably fixedly connected, which facilitates the disassembly of the collection tray 601.

[0035] like Figure 2 and Figure 3 and Figure 4 and Figure 7 The inner cavity of the outer cylinder 1 is provided with several buffer components 9 that cooperate with the collection tray 601 located at the bottom to buffer and limit its movement. The buffer components 9 include a lower support 901 that is detachably fixed to the inner cavity of the outer cylinder 1. An elastic buffer column 902 is fixed to the top of the lower support 901. An upper support 903 is provided directly above the lower support 901. A spring 904 is fixed between the lower support 901 and the lower support 902 and sleeved on the elastic buffer column 902. Several upper supports 903 are fixed to a third annular connecting plate 905. The third annular connecting plate 905 is detachably fixed to a second annular connecting plate 701 located at the bottom by bolts. The detachable fixed connection of the third annular connecting plate 905 and the second annular connecting plate 701 facilitates the disassembly of several collection trays 601. By setting several springs 904 and elastic buffer columns 902, the amplitude of the shaking of the collection tray 601 is limited and buffered when it shakes.

[0036] When in use, the staff removes the screws of the fixed ear plate 10 and the movable sealing plate, manually rotates the movable sealing plate to expose the annular fixed cutter disc 3. At this time, the user puts coffee beans into the gap between the annular fixed cutter disc 3 and the conical moving cutter disc 4. Then, the movable sealing plate is rotated in the opposite direction so that the movable sealing plate cooperates with the ear plate 10 and the fixed sealing plate to close the top opening of the annular fixed cutter disc 3. The ear plate 10 and the movable sealing plate are fixed with screws.

[0037] Then manually rotate the crank handle 13. The rotation of the crank handle 13 will drive the drive shaft 5, which is fixed to the crank handle 13, to rotate. The rotation of the drive shaft 5 will drive the conical moving cutter disc 4, which is fixed coaxially with the drive shaft 5, to rotate. The conical moving cutter disc 4 and the annular fixed cutter disc 3 work together to grind the coffee beans located in the gap between the conical moving cutter disc 4 and the annular fixed cutter disc 3.

[0038] The ground coffee powder leaks out through the gap between the bottom of the conical moving cutter 4 and the annular fixed cutter 3, and then leaks into the top collection plate 601 through the leakage hole 201 of the inner cylinder 2.

[0039] Meanwhile, the rotation of the drive shaft 5 will cause the long rod 801 fixed to the drive shaft 5 to rotate. The rotation of the long rod 801 will cause the vertical rod 802, connecting rod 803, cross rod 804 and collection tray 601, which are integrated with the long rod 801, to shake. The shaking amplitude of the collection tray 601 is limited by the action of the spring 904. The corrugated telescopic sleeve 7 reduces the possibility of coffee powder spillage while facilitating the shaking of the collection tray 601.

[0040] After grinding is complete, the user grabs the handle and pulls off the front panel 103 to expose the inner cavity of the outer cylinder 1. Then, the first annular connecting plate 602, the second annular connecting plate 701, and the third annular connecting plate 905 are disassembled, and several collection trays 601 are removed. Powder particles of different sizes in the collection trays 601 are used, re-ground, and recycled. Rubber sealing rings are fixed on the upper and lower sides of the first annular connecting plate 602, the second annular connecting plate 701, and the third annular connecting plate 905 to improve the sealing of the connection and reduce the possibility of coffee powder leakage.

[0041] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A coffee grinding centrifugal force fractionation apparatus, characterized in that, The outer cylinder (1) has a hollow inner cavity. A circular hole is provided at the middle of the top of the outer cylinder (1). An inner cylinder (2) with a closed circular hole and a funnel shape is fixed at the top of the outer cylinder (1). The bottom end of the inner cylinder (2) enters the inner cavity of the outer cylinder (1). The bottom end of the inner cylinder (2) entering the inner cavity of the outer cylinder (1) has a material leakage hole (201) that connects the inner cavity of the inner cylinder (2) and the inner cavity of the outer cylinder (1). The inner cylinder (2) has a detachable fixed annular cutter disc (3) adapted to the inner cylinder (2) on its inner cavity wall. The inner cylinder (2) has a rotatably connected conical moving cutter disc (4) adapted to the annular fixed cutter disc (3) at its inner cavity bottom. The top of the conical moving cutter disc (4) extends into the annular fixed cutter disc (3). A drive shaft (5) coaxially fixed to the conical moving cutter disc (4) passes through the conical moving cutter disc (4). The top and bottom ends of the drive shaft (5) both pass through the conical moving cutter disc (4). The bottom end of the drive shaft (5) passes through the inner cylinder (2) and is rotatably connected to the inner cylinder (2). The outer cylinder (1) has a collection component (6) for collecting and sieving coffee powder leaking from the leakage hole (201).

2. The coffee grinding centrifugal force classification and sizing apparatus of claim 1, wherein, The collection assembly (6) includes a plurality of collection trays (601) disposed in the inner cavity of the outer cylinder (1). The inner cavity of the collection tray (601) is hollow and open at the top. Except for the bottommost collection tray (601), the bottom of each collection tray (601) is provided with a screening groove. Each collection tray (601) is fixed with a screen (603) covering the screening groove. The aperture of the screen (603) gradually decreases from top to bottom. Each of the collection trays (601) has a first annular connecting plate (602) integrated at the top and bottom of its circumferential outer wall. Every two adjacent first annular connecting plates (602) are detachably fixedly connected by a number of bolts.

3. The coffee grinding centrifugal grading and sieving device as described in claim 2, characterized in that, The inner cavity of the outer cylinder (1) is also provided with a corrugated telescopic sleeve (7). The upper and lower ends of the outer wall of the corrugated telescopic sleeve (7) are fixed with a second annular connecting plate (701). The first annular connecting plate (602) and the second annular connecting plate (701) are the same size. The corrugated telescopic sleeve (7) is sleeved on the outer cylinder (2). The second annular connecting plate (701) at the top is detachably fixed to the top of the inner cavity groove of the outer cylinder (1) by bolts. The second annular connecting plate (701) at the bottom is detachably fixed to the first annular connecting plate (602) at the top by bolts.

4. The coffee grinding centrifugal grading and sieving device as described in claim 3, characterized in that, The inner cylinder (2) is provided with a vibration component (8) to control the shaking of several collection discs (601) to improve screening efficiency.

5. The coffee grinding centrifugal grading and sieving device as described in claim 4, characterized in that, The vibration assembly (8) includes a long rod (801) fixedly connected to one end of the drive shaft (5) that extends out of the inner cylinder (2). A vertical rod (802) is movably connected to the end of the long rod (801) away from the drive shaft (5). Two oppositely arranged connecting rods (803) are fixed on both sides of the bottom end of the vertical rod (802). A cross rod (804) is fixed to the bottom end of the two connecting rods (803). The two ends of the cross rod (804) that are fixed to the connecting rod (803) are fixed to the inner cavity wall of the collection tray (601) at the top. The two ends that are not fixed to the connecting rod (803) are fixedly connected to the lower support rod (805). The end of the lower support rod (805) away from the cross rod (804) is detachably fixed to the upper support rod (806) by bolts. The end of the upper support rod (806) away from the lower support rod (805) is fixed to the outer wall of the inner cylinder (2).

6. The coffee grinding centrifugal grading and sieving device as described in claim 2, characterized in that, The bottom of the inner cavity of the outer cylinder (1) is provided with several buffer components (9) that work in conjunction with the collection tray (601) located at the bottom to buffer and limit its movement.

7. The coffee grinding centrifugal grading and sieving device as described in claim 6, characterized in that, The buffer assembly (9) includes a lower support (901) that is detachably and fixedly connected to the bottom of the inner cavity of the outer cylinder (1). An elastic buffer column (902) is fixed on the top of the lower support (901). An upper support (903) is provided directly above the lower support (901). A spring (904) sleeved on the elastic buffer column (902) is fixed between the lower support (901) and the lower support (901). Several upper supports (903) are fixed to a third annular connecting plate (905). The third annular connecting plate (905) is detachably and fixedly connected to the second annular connecting plate (701) located at the bottom end by bolts.

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