A coffee bean granule screening device and its usage method

Abstract

This application relates to the technical field of general crushing, grinding or pulverizing, and specifically relates to a coffee bean particle screening device and a usage method thereof. The device includes a protective box body, which includes an upper box body and a lower box body that are interconnected. A first polishing sand layer is detachably connected to the inner wall of the upper box body; a screening and grinding assembly is arranged in the upper box body and is used for filtering coffee beans with qualified particle sizes and grinding the particles of unqualified coffee beans. The screening and grinding assembly includes an elastic spiral member and a particle size screening plate. The elastic spiral member is rotatably connected to the inner wall of the protective box body, and a number of polishing particles are arranged at intervals on the outer surface of the elastic spiral member. The particle size screening plate is movably connected in the upper box body and is located below the elastic spiral member; a grinding assembly is arranged in the lower box body. This application solves the problems of low production efficiency of high-quality coffee and uneven weights of the discharged materials at one time in the prior art.

Description

Technical Field

[0001] This application relates to the technical field of general crushing, grinding or pulverizing. Specifically, it relates to a coffee bean particle screening device and its usage method. Background Art

[0002] During the process of making coffee powder from coffee bean particles, factors such as the grinding degree, water temperature, and the evenness of the surface area of coffee powder particles will all affect the taste of coffee. The Chinese patent with the patent name "A coffee bean grinding into powder device with a screening structure" and the application number CN202222971147.8 that has been publicly disclosed can all achieve the functions of screening or grinding. However, the purpose of its screening is to screen out unbroken coffee bean particles, and its grinding targets the broken coffee bean fragments that have already undergone crushing. For higher-quality coffee powder, the coffee beans ground in the grinding process often use particles with more similar particle sizes, thereby ensuring that all coffee bean particles can be fully ground into powder and at the same time ensuring the high efficiency of production and processing. The structure of the prior art cannot directly obtain coffee powder products that meet the requirements in the same batch of grinding processes during production and processing, resulting in low production efficiency and uneven quality and weight of each finished product discharge. Summary of the Invention

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

[0004] One technical solution of this application:

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

[0006] Preferably, the grinding assembly includes two first grinding cylinders and second grinding cylinders that have the same structure and are symmetrically arranged. The two ends of the first grinding cylinder and the second grinding cylinder penetrate through the side wall of the lower box body, and the sides of the first grinding cylinder and the second grinding cylinder are in contact.

[0007] Preferably, a material blocking assembly is movably connected between the first grinding cylinder and the particle size screening plate. The material blocking assembly is used to block and temporarily store coffee particles. Specifically, the material blocking assembly includes two bearing plates with the same structure and symmetrically arranged. The bearing plates are spaced from the particle size screening plate, and the bearing plates are connected to the upper box body through rotating bases.

[0008] Preferably, both the first grinding cylinder and the second grinding cylinder are 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 surfaces and are 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, a first rotating shaft is coaxially connected to the center of the first grinding cylinder, and a second rotating shaft is coaxially connected to the center of the second grinding cylinder. Both ends of the first rotating shaft are connected to fixed rotating seats, and both ends of the second rotating shaft are connected to movable rotating seats. The fixed rotating seats are fixedly connected to the side wall of the lower box body, and the movable rotating seats are slidably connected to the side wall of the lower box body.

[0010] Preferably, an elastic resetting 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, and a discharge hole is formed in the side wall of the lower box body. The discharge hole is movably connected to a discharge cover; a feed port is formed in the top of the upper box body.

[0011] Preferably, a third polishing sand layer is detachably connected to the surface of the particle size screening plate close to the elastic spiral member. A plurality of material passing holes are formed in both the particle size screening plate and the third polishing sand layer; a second polishing sand layer is attached to the outer surface of the polishing particles.

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

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

[0014] Another technical solution of the present application:

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

[0016] S1. Determine the polishing precision and replace the corresponding first polishing sand layer and the particle size screening plate, and close the load-bearing plate;

[0017] S2. Control the elastic spiral member to rotate, and add coffee beans of different particle sizes from the feed port into the device for screening and polishing;

[0018] S3. When the coffee beans partially or completely fall onto the load-bearing plate, control the rotation of the first rotating shaft and the second rotating shaft and set the rotation duration, and control the telescopic seat to start reciprocating lifting work and set the working duration;

[0019] S4. Control the load-bearing plate to open, and 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 open the discharge cover to take away the polished 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. The device provides a closed environment by setting a protection box to prevent the coffee powder formed after polishing and grinding from entering the external space, resulting in waste of raw materials and increased production costs. In the prior art, coffee bean particles with large differences in particle size are mixed and polished, resulting in too large crushing fragments for particles with too large particle size, which requires secondary grinding, affecting the production efficiency of coffee powder, and at the same time, it also makes it impossible to produce and process higher-quality coffee powder. The present application sets a screening and grinding assembly to polish coffee bean particles with too large particle size, reduce the particle size of these coffee bean particles with too large particle size, and fully polish all coffee bean particles in one feeding, improving the polishing efficiency, and at the same time, it can also realize the production and processing of high-quality coffee powder. The set grinding assembly realizes the full grinding of coffee beans with more uniform particle size after polishing, solving the problems of low production efficiency of high-quality coffee and uneven weight of one-time discharge in the prior art. Description of the Drawings

[0023] Figure 1 It is a schematic internal structure diagram of the present application;

[0024] Figure 2 It is a schematic internal structure diagram of the upper box body of the present application;

[0025] Figure 3 It is a schematic external structure diagram of the present application;

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

[0027] In the figure: 1 - upper box body; 2 - lower box body; 3 - first grinding sand layer; 4 - elastic spiral part; 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 part; 14 - telescopic seat; 15 - discharge hole; 16 - feed inlet; 17 - load-bearing plate; 18 - rotating base; 19 - telescopic vibrating material part; 20 - first grinding part; 21 - second grinding part; 22 - third grinding part; 23 - fourth grinding part. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0029] Embodiment 1

[0030] Please refer to Figures 1 - 4 , the present application provides a coffee bean particle screening device, which includes a protective box body. The protective box body includes an upper box body 1 and a lower box body 2 that are connected to each other. 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 the 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 part 4 and a particle size screening plate 5. The elastic spiral part 4 is rotatably connected to the inner wall of the protective box body. A number of grinding particles 6 are arranged at intervals on the outer surface of the elastic spiral part 4. The particle size screening plate 5 is movably connected in the upper box body 1 and is located below the elastic spiral part 4.

[0031] It should be noted that by setting the protective box body to provide a closed environment, it can prevent the coffee powder formed after grinding and polishing from entering the external space, resulting in waste of raw materials and increased production costs. In the prior art, coffee bean particles with a large difference in particle size are mixed and ground, causing the particles with too large particle size to have too large crushed pieces, resulting in the need for secondary grinding, which affects the production efficiency of coffee powder. At the same time, it also makes it impossible to produce and process higher-quality coffee powder. In this embodiment, a screening and grinding assembly is set to grind the coffee bean particles with too large particle size, reduce the particle size of these coffee bean particles with too large particle size, and then fully grind all the coffee bean particles in the first feeding, improving the grinding efficiency. At the same time, it can also realize the production and processing of high-quality coffee powder. The set grinding assembly fully grinds the coffee beans with more uniform particle size after grinding, solving the problems of low production efficiency of high-quality coffee and uneven weights of the first discharge in the prior art.

[0032] Specifically, by connecting the first grinding sand layer 3 to the inner wall of the upper box body 1, it can realize the primary grinding of the coffee bean particles with too large particle size. By setting the elastic spiral member 4 to stir the coffee beans, the large-particle-size coffee beans that have not been ground can contact the first grinding sand layer 3 under the stirring action to reduce the particle size. Further, by setting the grinding particles 6 on the elastic spiral member 4 and attaching a second grinding sand layer with a certain roughness to the grinding particles 6, it realizes the secondary grinding of the coffee bean particles with too large particle size and improves the grinding efficiency. Preferably, the roughness of the first grinding sand layer 3 is different from that of the second grinding sand layer.

[0033] Specifically, by setting the upper box body 1 and the lower box body 2, it realizes the separation of the two working processes of grinding and polishing. Preferably, the upper box body 1 and the lower box body 2 are detachably connected. Furthermore, by replacing the first grinding sand layer 3 with different roughnesses and replacing the particle size screening plate 5 with different pore sizes, it can realize the production and processing of coffee powder with different quality requirements, improve the application range of the whole device. At the same time, compared with the prior art that requires replacing different equipment to produce coffee powder with different qualities, the device provided in this application can effectively reduce the production and processing costs. Therefore, this application also solves the problem of high production costs in the prior art.

[0034] Embodiment 2

[0035] Please refer to Figures 1 - 4, on the basis of Embodiment 1, the grinding assembly includes two first grinding cylinders 7 and second grinding cylinders 8 that are identical in structure and symmetrically arranged. The two ends of the first grinding cylinder 7 and the second grinding cylinder 8 penetrate 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 in contact with each other. By providing the first grinding cylinder 7 and the second grinding cylinder 8, more uniform coffee beans can be ground. Compared with directly grinding or crushing coffee bean particles in the prior art, in this embodiment, for the coffee bean particles that have been dried, after sieving the particle sizes and polishing the particle diameters, the coffee bean particles with more similar or uniform particle sizes are ground. On the basis of more uniform particle sizes, 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 sizes vary greatly due to the large difference in the coffee bean particle diameters after grinding.

[0036] Preferably, a material blocking assembly is movably connected between the first grinding cylinder 7 and the particle size screening plate 5. The material blocking assembly is used to block and temporarily store coffee particles. Specifically: the material blocking assembly includes two bearing plates 17 that are identical in structure and symmetrically arranged. The bearing plates 17 are arranged at intervals with the particle size screening plate 5, and the bearing plates 17 are connected to the upper box body 1 through rotating bases 18. By providing the bearing plates 17, at the beginning, the bearing plates 17 are closed to be parallel to the particle size screening plate 5, so that the coffee beans that meet the particle size requirements fall onto the bearing plates 17 and are temporarily stored thereon. When all or part of the coffee beans with larger particle sizes are polished, the bearing plates 17 are opened, and the coffee beans thereon 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 4, both the first grinding cylinder 7 and the second grinding cylinder 8 are integrally formed. The first grinding cylinder 7 includes a first grinding portion 20 and a second grinding portion 21, and the second grinding cylinder 8 includes 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 surfaces and are 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. In the prior art, most of them achieve the grinding of broken particles by setting multiple layers or various separated structures, making the volume of the entire grinding device relatively large and the structure too complex, resulting in overly complex operations during later maintenance and repair. It may even be impossible to repair and can only be directly discarded, leading to complex maintenance operations and a significant increase in the production and operation costs. In this application, by setting smooth surfaces and meshing surfaces, different grinding methods can be achieved through one grinding cylinder, effectively simplifying the structure of the entire device, minimizing the volume of the entire device as much as possible, facilitating maintenance, repair, and the disassembly and installation of different specification grinding layers. At the same time, the entire device can achieve a multi-stage grinding and multi-stage polishing process. The surfaces of the second grinding portion 21 and the fourth grinding portion 23 have grinding teeth for grinding, Figure 4 The shaded positions on the second grinding portion 21 and the fourth grinding portion 23 in Figure 1 and Figure 4 are the positions where the grinding teeth are set. The grinding of coffee bean particles is achieved through the grinding teeth. Specifically, in combination with

[0038] Preferably, a first rotating shaft 9 is coaxially connected to the center of the first grinding cylinder 7, and a second rotating shaft 10 is coaxially connected to the center of the second grinding cylinder 8. Both ends of the first rotating shaft 9 are connected to fixed rotating seats 11, and both ends of the second rotating shaft 10 are connected to movable rotating seats 12. The fixed rotating seats 11 are fixedly connected to the side wall of the lower box body 2, and the movable rotating seats 12 are slidably connected to the side wall of the lower box body 2. Two drive controllers respectively control the rotation of the first rotating shaft 9 and the second rotating shaft 10. Specifically, the first rotating shaft 9, the second rotating shaft 10, the fixed rotating seats 11, and the movable rotating seats 12 are provided. When the device is working, the fixed rotating seats 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 seats 12 will reciprocate according to the meshing situation to avoid interference with the relative movement between the second grinding part 21 and the fourth grinding part 23 caused by the contact between non-smooth surfaces and affect the normal progress of the grinding work. Specifically, through the provided movable rotating seats 12, and there is a gap between the fixed rotating seats 11 and the movable rotating seats 12, the fine adjustment of the distance between the first grinding cylinder 7 and the second grinding cylinder 8 can be realized, and interference after the smooth surface and the meshing surface are switched can be avoided.

[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, and a discharge hole 15 is opened on the side wall of the lower box body 2. The discharge hole 15 is movably connected to a discharge cover; a feed port 16 is opened at the top of the upper box body 1. The elastic reset member 13 is provided. 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 movement space is provided for the reciprocating movement of the movable rotating seat 12 to realize the fine adjustment of the position of the movable rotating seat 12 and ensure that the two grinding methods can be successfully staggered. Specifically, the telescopic seat 14 is provided. During the process of the first grinding cylinder 7 and the second grinding cylinder 8 grinding coffee particles, through the up and down reciprocating movement of the provided telescopic seat 14, the coffee particles are pushed into the interval 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, since the number of coffee bean particles is increasing continuously, the number of coffee particles at the positions below the first grinding cylinder 7 and the second grinding cylinder 8 will also increase continuously. Through the up and down adjustment of the provided telescopic seat 14, the situation of a large accumulation or even blockage of coffee particles at the positions below the first grinding cylinder 7 and the second grinding cylinder 8 can be avoided. Specifically, the feed port 16 is a strip-shaped port, and its length is the same as the length of the upper box body 1, which can enable the coffee bean particles to fall from different positions and contact its inner wall, so that the grinding starts when they fall into the upper box body 1.

[0040] Preferably, a third polishing abrasive layer is detachably connected to the surface of the particle size screening plate 5 close to the elastic spiral member 4. A number of material passing holes are provided in both the particle size screening plate 5 and the third polishing abrasive layer; a second polishing abrasive layer is attached to the outer surface of the polishing particles 6. By providing the particle size screening plate 5, polishing can be achieved at various positions in the entire upper box body 1 and the polishing space on the particle size screening plate 5, improving the polishing efficiency and effectively shortening the working time of the entire device.

[0041] Preferably, the screening and grinding assembly further includes a telescopic material shaking member 19. One end of the telescopic material shaking member 19 is detachably connected to the spiral position of the elastic spiral member 4, and the other end extends out from the side wall of the upper box body 1; the elastic spiral member 4 is made of an elastic material; the screening and grinding assembly further includes a telescopic material shaking member 19. One end of the telescopic material shaking member 19 is detachably connected to the spiral position of the elastic spiral member 4, and the other end extends out from the side wall of the upper box body 1; the elastic spiral member 4 is made of an elastic material. By providing the telescopic material shaking member 19, 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 coffee bean particles in the upper box body 1 are polished 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 the driving controller to perform telescopic work at a specified frequency. During the telescopic process, the elastic force at each position of the elastic spiral member 4 itself changes, causing the coffee powder and coffee bean particles polished from the elastic spiral member 4 to fall, maximizing the avoidance of a large amount of coffee powder remaining on the elastic spiral member 4 and ensuring the discharge amount.

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

[0043] Preferably, the grit size of the first polishing abrasive layer 3 is 60 - 600.

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

[0045] Preferably, a strip-shaped protective cover is connected to the side of the rotating base 18 close to the particle size screening plate 5. After the bearing plate 17 rotates downward, the strip-shaped protective cover can prevent the blockage of coffee powder.

[0046] Embodiment 3

[0047] Please refer to Figures 1 - 4, for a better understanding of the technical solution of the present application, on the basis of Embodiment 2, this embodiment provides a method for using a coffee bean particle screening device, including the following steps:

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

[0049] S2. Control the elastic spiral member 4 to rotate, and add coffee beans of different particle sizes from the feed inlet 16 into the device for screening and polishing;

[0050] S3. When the coffee beans partially or completely fall onto the load-bearing plate 17, control the rotation of the first rotating shaft 9 and the second rotating shaft 10 and set the rotation duration, and control the telescopic seat 14 to start reciprocating up and down and set the working duration;

[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 open the discharge cover to take away the polished coffee powder.

[0053] The above is only the preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall 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; 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); the particle size screening plate (5) is movably connected to the upper box body (1) and is located below the elastic spiral (4); a second grinding sand layer is attached to the outer surface of the grinding particles (6); 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 (4); and a plurality of material passing holes are provided on the particle size screening plate (5) and the third grinding sand layer; The screening and grinding assembly further comprises 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; the telescopic material-shaking member (19) is connected to a drive controller; 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 the drive controller to perform telescopic operation; A grinding assembly, the grinding assembly being arranged in the lower box body (2); the grinding assembly comprising a first grinding cylinder (7) and a second grinding cylinder (8) having the same structure and being symmetrically arranged, the two ends of the first grinding cylinder (7) and the second grinding cylinder (8) passing through the side wall of the lower box body (2), and the side surfaces of the first grinding cylinder (7) and the second grinding cylinder (8) being in abutment with each other; 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).

2. The coffee bean particle screening device according to claim 1, 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 arranged at intervals from the particle size screening plates (5), and the load-bearing plates (17) being connected to the upper box body (1) via a rotating base (18).

3. The coffee bean particle screening device according to claim 2, 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).

4. The coffee bean particle screening device according to claim 3, 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).

5. The coffee bean particle screening device according to claim 4, characterized in that: 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, and the load-bearing plate (17) are all connected to a drive controller.

6. A method for using a coffee bean particle screening device, using the coffee bean particle screening device according to claim 5, 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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