Coffee bean particle screening device and using method

Abstract

The invention relates to the technical field of general crushing, grinding or smashing, in particular to a coffee bean particle screening device and a using method.The coffee bean particle screening device comprises a protection box body, the protection box body comprises an upper box body and a lower box body which communicate with each other, and the inner wall of the upper box body is detachably connected with a first grinding sand layer; the screening and grinding assembly is arranged in the upper box body and used for filtering coffee beans with qualified particle sizes and grinding particles of unqualified coffee beans, the screening and grinding assembly internally comprises an elastic spiral part and a particle size screening plate, the elastic spiral part is rotationally connected with the inner wall of the protection box body, and a plurality of grinding particles are distributed on the outer surface of the elastic spiral part at intervals; the particle size screening plate is movably connected into the upper box body and located below the elastic spiral piece. And the grinding assembly is arranged in the lower box body. The problems that in the prior art, the production efficiency of high-quality coffee is low, and the weight of one-time discharging is uneven are solved.

Description

Technical Field

[0001] The present application relates to the general field of crushing, grinding or pulverizing technology, and in particular to a coffee bean particle screening device and a method of use. Background Art

[0002] In the process of making coffee bean particles into coffee powder, the grinding degree, water temperature, and surface area uniformity of coffee powder particles will affect the taste of coffee. The patent name that has been disclosed is a coffee bean grinding and powdering equipment with a screening structure, and the Chinese patent with application number CN202222971147.8. Although both can achieve the function of screening or grinding, the purpose of screening is to screen out unbroken coffee bean particles, and the grinding is aimed at the broken coffee bean fragments. For higher-quality coffee powder, the coffee beans ground in the grinding process are often selected from particles with a closer particle size, thereby ensuring that all coffee bean particles can be fully ground into powder, while ensuring the efficiency of production and processing. This structure of the prior art makes it impossible to directly obtain coffee powder products that meet the requirements in the same batch of grinding processes during the production and processing process, and the production efficiency is low and the quality of each finished product is uneven. Summary of the invention

[0003] The purpose of the present application is to provide a coffee bean particle screening device and a method of use, which solves the problems in the prior art of low production efficiency of high-quality coffee and uneven weight of one-time discharge.

[0004] A technical solution of this application:

[0005] A coffee bean particle screening device is provided, which comprises a protective box body, wherein the protective box body comprises an upper box body and a lower box body which are interconnected, wherein the inner wall of the upper box body is detachably connected with a first grinding sand layer; a screening and grinding assembly, wherein the screening and grinding assembly is arranged in the upper box body and is used to filter coffee beans with qualified particle sizes and grind particles of unqualified coffee beans; and a grinding assembly, wherein the grinding assembly is arranged in the lower box body; wherein the screening and grinding assembly comprises an elastic spiral and a particle size screening plate, wherein the elastic spiral is rotatably connected to the inner wall of the protective box body, a plurality of grinding particles are arranged at intervals on the outer surface of the elastic spiral, and the particle size screening plate is movably connected in the upper box body and is located below the elastic spiral.

[0006] Preferably, the grinding assembly comprises a first grinding cylinder and a second grinding cylinder with identical structures and symmetrically arranged, both ends of the first grinding cylinder and the second grinding cylinder pass through the side wall of the lower box body, and the side surfaces of the first grinding cylinder and the second grinding cylinder are abutted.

[0007] Preferably, a material blocking assembly is movably connected between the first grinding cylinder and the particle size screening plate, and the material blocking assembly is used to block and temporarily store coffee particles. Specifically: the material blocking assembly includes two load-bearing plates with identical structures and symmetrically arranged, the load-bearing plates are spaced apart from the particle size screening plates, and the load-bearing plates are connected to the upper box through a rotating base.

[0008] Preferably, the first grinding cylinder and the second grinding cylinder are both integrally formed, the first grinding cylinder includes a first grinding part and a second grinding part, the second grinding cylinder includes a third grinding part and a fourth grinding part, the surfaces of the first grinding part and the third grinding part are smooth and symmetrically arranged, the second grinding part and the fourth grinding part are symmetrically arranged, the first grinding part abuts against the third grinding part, and the second grinding part meshes with the fourth grinding part.

[0009] Preferably, the center of the first grinding cylinder is coaxially connected to a first rotating shaft, the center of the second grinding cylinder is coaxially connected to a second rotating shaft, both ends of the first rotating shaft are connected to a fixed rotating seat, both ends of the second rotating shaft are connected to a movable rotating seat, the fixed rotating seat is fixedly connected to the side wall of the lower box body, and the movable rotating seat is slidably connected to the side wall of the lower box body.

[0010] Preferably, an elastic reset member is connected between the fixed rotating seat and the movable rotating seat; a telescopic seat is connected to the bottom of the inner cavity of the lower box body, a discharge hole is opened on the side wall of the lower box body, and the discharge hole is movably connected to a discharge cover; a feed port is opened on the top of the upper box body.

[0011] Preferably, a third grinding sand layer is detachably connected to the surface of the particle size screening plate close to the elastic spiral member, and the particle size screening plate and the third grinding sand layer are both provided with a plurality of feeding holes; a second grinding sand layer is attached to the outer surface of the grinding particles.

[0012] Preferably, the screening and grinding assembly further includes a telescopic material shaking piece, one end of which is detachably connected to the spiral position of the elastic spiral piece, and the other end of which extends out from the side wall of the upper box body; the elastic spiral piece is made of elastic material.

[0013] Preferably, the elastic spiral member, the first rotating shaft, the second rotating shaft, the elastic reset member, the telescopic seat, the discharge cover, the load-bearing plate, and the telescopic shaking member are all connected to a drive controller.

[0014] Another technical solution of this application:

[0015] A method for using a coffee bean particle screening device is provided, comprising the following steps:

[0016] S1, determining the grinding accuracy and replacing the corresponding first grinding sand layer and the particle size screening plate, and closing the load-bearing plate;

[0017] S2, controlling the elastic spiral to rotate, adding coffee beans of different particle sizes into the device from the feed inlet for screening and grinding;

[0018] S3, when part or all of the coffee beans fall onto the load-bearing plate, the first rotating shaft and the second rotating shaft are controlled to rotate and the rotation duration is set, and the telescopic seat is controlled to start reciprocating lifting and lowering and the working duration is set;

[0019] S4, controlling the load-bearing plate to open, so that the coffee bean particles fall between the first grinding cylinder and the second grinding cylinder and are ground;

[0020] S5, the first grinding cylinder and the second grinding cylinder stop working, and the discharge cover is opened to take out the ground coffee powder.

[0021] The technical solution of the present application has at least the following advantages and beneficial effects:

[0022] The present application provides a coffee bean particle screening device, which provides a closed environment by setting a protective box to prevent the coffee powder formed after grinding and grinding from entering the external space, causing a waste of raw materials and increasing production costs. In the prior art, coffee bean particles with large particle size differences are mixed and ground, resulting in particles with too large particle sizes being too large to be crushed into pieces, which requires secondary grinding, affecting the production efficiency of coffee powder, and also making it impossible to produce and process higher-quality coffee powder. The present application sets a screening and grinding component to grind coffee bean particles with too large particle sizes, so that the particle sizes of these coffee bean particles with too large particle sizes are reduced, and all coffee bean particles fed at one time are fully ground, improving the grinding efficiency, and at the same time, the production and processing of high-quality coffee powder can be achieved. The grinding component is set to fully grind coffee beans with more uniform particle sizes after grinding, solving the problem of low production efficiency of high-quality coffee and uneven weight of one-time discharge in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the internal structure of this application;

[0024] Figure 2 This is a schematic diagram of the structure inside the box in this application;

[0025] Figure 3 This is a schematic diagram of the external structure of this application;

[0026] Figure 4 It is a schematic diagram of the structure of the first grinding cylinder and the second grinding cylinder in this application.

[0027] In the figure: 1-upper box; 2-lower box; 3-first grinding sand layer; 4-elastic spiral; 5-particle size screening plate; 6-grinding particles; 7-first grinding cylinder; 8-second grinding cylinder; 9-first rotating shaft; 10-second rotating shaft; 11-fixed rotating seat; 12-movable rotating seat; 13-elastic reset member; 14-telescopic seat; 15-discharging hole; 16-feeding port; 17-load-bearing plate; 18-rotating base; 19-telescopic shaking member; 20-first grinding section; 21-second grinding section; 22-third grinding section; 23-fourth grinding section. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] Example 1

[0030] Please refer to Figure 1-Figure 4 The present application provides a coffee bean particle screening device, which includes a protective box body, which includes an upper box body 1 and a lower box body 2 that are interconnected, and a first grinding sand layer 3 is detachably connected to the inner wall of the upper box body 1; a screening and grinding assembly, which is arranged in the upper box body 1 and is used to filter coffee beans with qualified particle sizes and grind particles of unqualified coffee beans; a grinding assembly, which is arranged in the lower box body 2; wherein, the screening and grinding assembly includes an elastic spiral 4 and a particle size screening plate 5, the elastic spiral 4 is rotatably connected to the inner wall of the protective box, a plurality of grinding particles 6 are arranged at intervals on the outer surface of the elastic spiral 4, and the particle size screening plate 5 is movably connected to the upper box body 1 and is located below the elastic spiral 4.

[0031] It is worth noting that by providing a closed environment with a protective box, the coffee powder formed after grinding and grinding is prevented from entering the external space, causing a waste of raw materials and increasing production costs. In the prior art, coffee bean particles with large particle sizes are mixed and ground, resulting in particles with too large particle sizes requiring secondary grinding due to excessive crushing fragments, affecting the production efficiency of coffee powder, and also resulting in the inability to produce and process higher quality coffee powder. In this embodiment, a screening and grinding assembly is provided to grind coffee bean particles with too large particle sizes, so that the particle sizes of these coffee bean particles with too large particle sizes are reduced, thereby achieving full grinding of all coffee bean particles fed at one time, improving the grinding efficiency, and also achieving the production and processing of high-quality coffee powder. The grinding assembly provided can fully grind coffee beans with more uniform particle sizes after grinding, solving the problem of low production efficiency of high-quality coffee and uneven weight of one-time discharge in the prior art.

[0032] In detail, by connecting the first grinding sand layer 3 to the inner wall of the upper box body 1, the coffee bean particles with too large particle size can be ground at the first level, and the coffee beans can be stirred by the elastic spiral member 4, so that the unground large-size coffee beans can contact the first grinding sand layer 3 under the stirring action to achieve particle size reduction. Further, by setting the grinding particles 6 on the elastic spiral member 4 and attaching the second grinding sand layer with a certain roughness to the grinding particles 6, the coffee bean particles with too large particle size can be ground at the second level, thereby improving the grinding efficiency. Preferably, the roughness of the first grinding sand layer 3 and the second grinding sand layer are different.

[0033] In detail, by setting up the upper box body 1 and the lower box body 2, the separation of the two working processes of grinding and grinding is achieved. Preferably, the upper box body 1 and the lower box body 2 are detachably connected, and then by replacing the first grinding sand layer 3 with different roughness and replacing the particle size screening plate 5 with different apertures, the production and processing of coffee powder with different quality requirements can be achieved, thereby improving the application scope of the entire device. At the same time, compared with the prior art that needs to replace different equipment to produce coffee powder of different qualities, the device provided by the present application can effectively reduce the cost of production and processing. Therefore, the present application also solves the problem of high production cost in the prior art.

[0034] Example 2

[0035] Please refer to Figure 1-Figure 4On the basis of Example 1, the grinding assembly includes two first grinding cylinders 7 and second grinding cylinders 8 with the same structure and symmetrically arranged. The two ends of the first grinding cylinder 7 and the second grinding cylinder 8 pass through the side wall of the lower box body 2, and the sides of the first grinding cylinder 7 and the second grinding cylinder 8 are abutted. By setting the first grinding cylinder 7 and the second grinding cylinder 8, the coffee beans with more uniform particles can be ground. Compared with the prior art that directly grinds or crushes the coffee bean particles, this embodiment screens the dried coffee bean particles and grinds the particle size, and then grinds the coffee bean particles with more similar or uniform particle sizes. On the basis of more uniform particle size, the first grinding cylinder 7 and the second grinding cylinder 8 provided in this embodiment can make the grinding process smoother and the grinding efficiency higher, and avoid the situation where the powder particle size difference is too large due to the large difference in coffee bean particle size after grinding.

[0036] Preferably, a blocking assembly is movably connected between the first grinding cylinder 7 and the particle size screening plate 5, and the blocking assembly is used to block and temporarily store the coffee particles. Specifically, the blocking assembly includes two load-bearing plates 17 of the same structure and symmetrically arranged. The load-bearing plates 17 are arranged at intervals with the particle size screening plate 5, and the load-bearing plates 17 are connected to the upper box 1 through a rotating base 18. Through the set load-bearing plates 17, the load-bearing plates 17 are closed at the beginning to be parallel to the particle size screening plate 5, and the coffee beans that meet the particle size requirements fall onto the load-bearing plates 17 and are temporarily stored thereon. When the coffee beans with larger particle sizes are completely or partially ground, the load-bearing plates 17 are opened to allow the coffee beans on them to fall between the first grinding cylinder 7 and the second grinding cylinder 8, and the falling coffee beans are ground during the rotation of the first grinding cylinder 7 and the second grinding cylinder 8.

[0037] Preferably, please refer to Figure 4The first grinding cylinder 7 and the second grinding cylinder 8 are both integrally formed, the first grinding cylinder 7 includes a first grinding part 20 and a second grinding part 21, the second grinding cylinder 8 includes a third grinding part 22 and a fourth grinding part 23, the surfaces of the first grinding part 20 and the third grinding part 22 are smooth and symmetrically arranged, the second grinding part 21 and the fourth grinding part 23 are symmetrically arranged, the first grinding part 20 abuts against the third grinding part 22, and the second grinding part 21 meshes with the fourth grinding part 23. In the prior art, most of the broken particles are ground by setting multiple layers or multiple separate structures, which makes the entire grinding device large in size and too complicated in structure, resulting in too complicated operation in the later overhaul and maintenance process, and even may not be repaired and can only be directly discarded, resulting in complicated maintenance process operation and greatly increased production and operation costs. The present application can achieve different grinding methods through one grinding column by setting a smooth surface and a meshing surface, which can effectively simplify the structure of the entire device, minimize the volume of the entire device as much as possible, facilitate overhaul, maintenance and the disassembly and installation of grinding layers of different specifications, and the entire device can achieve multi-stage grinding and multi-stage grinding processes. The second grinding part 21 and the fourth grinding part 23 have grinding teeth on their surfaces for grinding. Figure 4 The shadow position on the second grinding part 21 and the fourth grinding part 23 is the position where the grinding teeth are set, and the coffee bean particles are ground by the grinding teeth. Figure 1 and Figure 4 For example, when the first grinding part 20 and the third grinding part 22 are located at the top and rotate inward, the first grinding part 20 and the third grinding part 22 grind the first batch of coffee beans particles falling from the top, and then the second grinding part 21 and the fourth grinding part 23 rotate to the top, and then the first batch of coffee beans that have been ground are on the lower platform and are ground again by the first grinding part 20 and the third grinding part 22, while at the same time, the second grinding part 21 and the fourth grinding part 23 located at the top use their grinding teeth to grind the second batch of coffee beans that fall again from the top, and the platform here refers to the telescopic seat 14, and so on and so forth. When all the coffee beans fall onto the platform, the first grinding cylinder 7 and the second grinding cylinder 8 rotate in the box, so that the first grinding part 20 and the third grinding part 22 continuously circulate in the upper and lower positions, and at the same time, the second grinding part 21 and the fourth grinding part 23 also continuously circulate in the upper and lower positions, and through the two grinding surfaces existing simultaneously on one grinding cylinder, the coffee beans are subjected to the alternating grinding methods of smooth surface grinding and non-smooth surface grinding, thereby improving the grinding efficiency.

[0038] Preferably, the center of the first grinding cylinder 7 is coaxially connected to the first rotating shaft 9, the center of the second grinding cylinder 8 is coaxially connected to the second rotating shaft 10, both ends of the first rotating shaft 9 are connected to the fixed rotating seat 11, both ends of the second rotating shaft 10 are connected to the movable rotating seat 12, the fixed rotating seat 11 is fixedly connected to the side wall of the lower box body 2, and the movable rotating seat 12 is slidably connected to the side wall of the lower box body 2. Two driving controllers respectively control the first rotating shaft 9 and the second rotating shaft 10 to realize rotation. In detail, a first rotating shaft 9, a second rotating shaft 10, a fixed rotating seat 11, and a movable rotating seat 12 are provided. When the device is working, the fixed rotating seat 11 will not move in position during the rotation of the first rotating shaft 9; when the second rotating shaft 10 rotates and drives the second grinding part 21 to contact the fourth grinding part 23, the movable rotating seat 12 will produce reciprocating motion according to the meshing condition to avoid interference with the relative motion between the second grinding part 21 and the fourth grinding part 23 due to the contact between the non-smooth surfaces, thereby affecting the normal progress of the grinding work. Specifically, by providing the movable rotating seat 12, and the fixed rotating seat 11 and the movable rotating seat 12 have a gap, it is possible to achieve a fine adjustment of the distance between the first grinding cylinder 7 and the second grinding cylinder 8 to avoid interference after the smooth surface and the meshing surface are switched.

[0039] Preferably, an elastic reset member 13 is connected between the fixed rotating seat 11 and the movable rotating seat 12; a telescopic seat 14 is connected to the bottom of the inner cavity of the lower box body 2, a discharge hole 15 is provided on the side wall of the lower box body 2, and the discharge hole 15 is movably connected to the discharge cover; a feed port 16 is provided on the top of the upper box body 1. The elastic reset member 13 is provided, and the elastic reset member 13 is located in the gap between the fixed rotating seat 11 and the movable rotating seat 12. According to the elastic characteristics of the elastic reset member 13, sufficient activity space is provided for the reciprocating motion of the movable rotating seat 12, and the position of the movable rotating seat 12 is finely adjusted to ensure that the two grinding methods can be successfully interlaced. In detail, a telescopic seat 14 is provided. During the process of the first grinding cylinder 7 and the second grinding cylinder 8 grinding the coffee particles, the telescopic seat 14 reciprocates up and down to push the coffee particles into the gap below the first grinding cylinder 7 and the second grinding cylinder 8, thereby promoting the coffee particles to be ground again. On the other hand, as the number of coffee bean particles continues to increase, the number of coffee particles below the first grinding cylinder 7 and the second grinding cylinder 8 will also continue to increase. By adjusting the telescopic seat 14 up and down, it is possible to avoid a large amount of coffee particles from being accumulated or even blocked below the first grinding cylinder 7 and the second grinding cylinder 8. In detail, the feed port 16 is a strip port, and its length is the same as the length of the upper box body 1, so that the coffee bean particles can fall from different positions and contact with its inner wall, so that the coffee bean particles can start grinding as soon as they fall into the upper box body 1.

[0040] Preferably, a third grinding sand layer is detachably connected to the surface of the particle size screening plate 5 on the side close to the elastic spiral member 4, and a plurality of feeding holes are provided on the particle size screening plate 5 and the third grinding sand layer; a second grinding sand layer is attached to the outer surface of the grinding particles 6. The particle size screening plate 5 is provided so that each position of the grinding space in the entire upper box 1 and on the particle size screening plate 5 can be polished, thereby improving the efficiency of polishing and effectively shortening the working time of the entire device.

[0041] Preferably, the screening and grinding assembly also includes a telescopic material shaking piece 19, one end of the telescopic material shaking piece 19 is detachably connected to the spiral position of the elastic spiral piece 4, and the other end extends from the side wall of the upper box body 1; the elastic spiral piece 4 is made of elastic material; the screening and grinding assembly also includes a telescopic material shaking piece 19, one end of the telescopic material shaking piece 19 is detachably connected to the spiral position of the elastic spiral piece 4, and the other end extends from the side wall of the upper box body 1; the elastic spiral piece 4 is made of elastic material. A telescopic material-shaking member 19 is provided, and one end of the telescopic material-shaking member 19 is passed through the side wall of the upper box body 1 and detachably connected to the spiral position of the elastic spiral member 4. When the grinding of the coffee bean particles in the upper box body 1 is completed or when the elastic spiral member 4 stops rotating, the telescopic material-shaking member 19 is connected to the elastic spiral member 4, and the telescopic material-shaking member 19 is controlled by a driving controller to perform telescopic work at a specified frequency. During the telescopic process, the elastic force of each position of the elastic spiral member 4 changes, so that the coffee powder and coffee bean particles ground from the elastic spiral member 4 fall off, thereby avoiding the elastic spiral member 4 from generating a large amount of coffee powder as much as possible and ensuring the discharge amount.

[0042] Preferably, the elastic spiral member 4, the first rotating shaft 9, the second rotating shaft 10, the elastic reset member 13, the telescopic seat 14, the discharge cover, the rotating base 18, and the telescopic material shaking member 19 are all connected to a drive controller. The drive controller is used to control the start, stop, working time, and working frequency of the elastic spiral member 4, the first rotating shaft 9, the second rotating shaft 10, the elastic reset member 13, the telescopic seat 14, the discharge cover, the rotating base 18, and the telescopic material shaking member 19.

[0043] Preferably, the first grinding sand layer 3 has a grit size of 60-600.

[0044] Preferably, the telescopic seat 14 is connected to the lower box body 2 by an elastic sealing ring, which can achieve a sealing effect and will not affect the normal up and down movement of the telescopic seat 14.

[0045] Preferably, a strip protective cover is connected to one side of the rotating base 18 close to the particle size screening plate 5, and after the load-bearing plate 17 rotates downward, the strip protective cover can prevent clogging by coffee powder.

[0046] Example 3

[0047] Please refer to Figure 1-Figure 4In order to better understand the technical solution of the present application, based on Example 2, this embodiment provides a method for using a coffee bean particle screening device, comprising the following steps:

[0048] S1, determine the grinding accuracy and replace the corresponding first grinding sand layer 3 and particle size screening plate 5, and close the load-bearing plate 17;

[0049] S2, controlling the elastic spiral 4 to rotate, adding coffee beans of different particle sizes into the device from the feed inlet 16 for screening and grinding;

[0050] S3, when part or all of the coffee beans fall onto the load-bearing plate 17, the first rotating shaft 9 and the second rotating shaft 10 are controlled to rotate and the rotation duration is set, and the telescopic seat 14 is controlled to start reciprocating lifting and lowering and the working duration is set;

[0051] S4, control the load-bearing plate 17 to open, and the coffee bean particles fall between the first grinding cylinder 7 and the second grinding cylinder 8 and are ground;

[0052] S5, the first grinding cylinder 7 and the second grinding cylinder 8 stop working, and the discharge cover is opened to take out the ground coffee powder.

[0053] The above description is only a preferred implementation mode of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A coffee bean particle screening device, characterized in that: include: A protective box, the protective box comprising an upper box (1) and a lower box (2) which are connected to each other, and a first grinding layer (3) is detachably connected to the inner wall of the upper box (1); A screening and grinding assembly, the screening and grinding assembly being arranged in the upper housing (1) and used for filtering coffee beans of a qualified particle size and grinding particles of unqualified coffee beans; A grinding assembly, wherein the grinding assembly is arranged in the lower box (2); wherein: The screening and grinding assembly comprises an elastic spiral (4) and a particle size screening plate (5); the elastic spiral (4) is rotatably connected to the inner wall of the protective box body; a plurality of grinding particles (6) are arranged at intervals on the outer surface of the elastic spiral (4); and the particle size screening plate (5) is movably connected to the upper box body (1) and is located below the elastic spiral (4).

2. The coffee bean particle screening device according to claim 1, characterized in that: The grinding assembly comprises a first grinding cylinder (7) and a second grinding cylinder (8) of identical structure and symmetrically arranged, the two ends of the first grinding cylinder (7) and the second grinding cylinder (8) pass through the side wall of the lower box (2), and the side surfaces of the first grinding cylinder (7) and the second grinding cylinder (8) are in abutment with each other.

3. The coffee bean particle screening device according to claim 2, characterized in that: A material blocking assembly is movably connected between the first grinding cylinder (7) and the particle size screening plate (5), and the material blocking assembly is used to block and temporarily store coffee particles. Specifically: The material blocking assembly comprises two load-bearing plates (17) of identical structure and symmetrical arrangement, the load-bearing plates (17) being spaced apart from the particle size screening plate (5), and the load-bearing plates (17) being connected to the upper box body (1) via a rotating base (18).

4. The coffee bean particle screening device according to claim 3, characterized in that: The first grinding cylinder (7) and the second grinding cylinder (8) are both integrally formed; the first grinding cylinder (7) comprises a first grinding portion (20) and a second grinding portion (21); the second grinding cylinder (8) comprises a third grinding portion (22) and a fourth grinding portion (23); the surfaces of the first grinding portion (20) and the third grinding portion (22) are smooth and symmetrically arranged; the second grinding portion (21) and the fourth grinding portion (23) are symmetrically arranged; the first grinding portion (20) abuts against the third grinding portion (22), and the second grinding portion (21) meshes with the fourth grinding portion (23).

5. The coffee bean particle screening device according to claim 4, characterized in that: The center of the first grinding cylinder (7) is coaxially connected to a first rotating shaft (9), and the center of the second grinding cylinder (8) is coaxially connected to a second rotating shaft (10). Both ends of the first rotating shaft (9) are connected to a fixed rotating seat (11), and both ends of the second rotating shaft (10) are connected to a movable rotating seat (12). The fixed rotating seat (11) is fixedly connected to the side wall of the lower box body (2), and the movable rotating seat (12) is slidably connected to the side wall of the lower box body (2).

6. The coffee bean particle screening device according to claim 5, characterized in that: An elastic reset member (13) is connected between the fixed rotating seat (11) and the movable rotating seat (12); a telescopic seat (14) is connected to the bottom of the inner cavity of the lower box body (2); a discharge hole (15) is provided on the side wall of the lower box body (2); and the discharge hole (15) is movably connected to a discharge cover; and a feed port (16) is provided on the top of the upper box body (1).

7. The coffee bean particle screening device according to claim 3, characterized in that: A third grinding sand layer is detachably connected to the surface of the particle size screening plate (5) on one side close to the elastic spiral member (4), and the particle size screening plate (5) and the third grinding sand layer are both provided with a plurality of material passing holes; a second grinding sand layer is attached to the outer surface of the grinding particles (6).

8. The coffee bean particle screening device according to claim 6, characterized in that: The screening and grinding assembly also includes a telescopic material shaking member (19), one end of which is detachably connected to the spiral position of the elastic spiral member (4) and the other end of which extends out from the side wall of the upper box body (1); the elastic spiral member (4) is made of elastic material.

9. The coffee bean particle screening device according to claim 8, characterized in that: The elastic spiral component (4), the first rotating shaft (9), the second rotating shaft (10), the elastic reset component (13), the telescopic seat (14), the discharge cover, the load-bearing plate (17), and the telescopic shaking component (19) are all connected to a drive controller.

10. A method for using a coffee bean particle screening device, using the coffee bean particle screening device according to any one of claims 1 to 9, comprising the following steps: S1, determining the grinding accuracy and replacing the corresponding first grinding sand layer (3) and the particle size screening plate (5), and closing the load-bearing plate (17); S2, controlling the elastic spiral member (4) to rotate, and adding coffee beans of different particle sizes into the device through the feed inlet (16) for screening and grinding; S3. When part or all of the coffee beans fall onto the load-bearing plate (17), the first rotating shaft (9) and the second rotating shaft (10) are controlled to rotate and the rotation duration is set, and the telescopic seat (14) is controlled to start reciprocating lifting and lowering and the working duration is set; S4, controlling the load-bearing plate (17) to open, so that the coffee bean particles fall between the first grinding cylinder (7) and the second grinding cylinder (8) and are ground; S5. The first grinding cylinder (7) and the second grinding cylinder (8) stop working, and the discharge cover is opened to take out the ground coffee powder.

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