A brown corundum particle size screening device

Abstract

A brown corundum particle size screening device includes a feeding device and a particle size screening mechanism, wherein the feeding device is arranged above the particle size screening mechanism, and the particle size screening mechanism is provided with a shell structure, and a first screen structure, a second screen structure and a third screen structure are arranged in sequence from top to bottom in the shell structure, and a layered discharging mechanism is installed on the discharging port, and the layered discharging mechanism is provided with a first discharging channel, a second discharging channel and a third discharging channel, and a half-section screen structure is also arranged above the first screen structure, and the half-section screen structure is installed on the shell structure, and the side edge of the half-section screen structure is aligned with the first discharging channel, and the feeding device is aligned with the half-section screen structure, and the mesh number of the half-section screen structure is more than the mesh number of the first screen structure, and a vibration mechanism is also arranged on the shell structure. The present invention can adjust the particle size distribution and content proportion of the brown corundum product to be screened out, save process and screening costs, and ensure product quality.

Description

Technical Field

[0001] The utility model belongs to the technical field of particle size screening equipment, and specifically relates to a brown corundum particle size screening device. Background Art

[0002] Brown corundum, also known as diamond sand, is a brown artificial corundum made by melting and reducing three raw materials, namely bauxite, carbon material and iron filings, in an electric arc furnace. It is then crushed and shaped by an autogenous mill, magnetically separated to remove iron, and sieved into various particle sizes. It has the characteristics of high purity, good crystallinity, strong fluidity, low expansion coefficient, and corrosion resistance. Brown corundum can be divided into four types according to particle size: segment sand, granular sand, micro powder, and fine powder. The commonly used particle sizes of segment sand are 0-1mm, 1-3mm, 3-5mm, 5-8mm, 8-12mm, etc., and are generally used for rough sandblasting and polishing of workpieces. There are many methods for dividing the particle size of brown corundum, such as screening method and sedimentation method. The screening method is currently used more frequently. The screening method uses a sieve (screen) to screen. The number of meshes on the sieve is called mesh. 50 mesh means that the number of meshes per square inch is 50, and 100 mesh means 100. The larger the mesh number, the more meshes there are, which means that the particle size is smaller. The brown corundum particle size obtained by the screening method is usually that the content of brown corundum of different particle sizes within the particle size range screened by the screen is roughly the same and evenly distributed. However, in some cases, according to the demand, a brown corundum product with a higher content of a certain particle size within the same particle size range needs to be obtained, and the distribution is even. For example, within the range of 5-8mm segment sand particle size, it is necessary to obtain 6-8mm particle size brown corundum products accounting for about 70%, and 5-6mm particle size brown corundum products accounting for about 30%, and naturally and evenly mixed into 5-8mm particle size brown corundum products, which is currently difficult to achieve when screening with a screen alone. If it is divided into two particle size ranges and screened separately and then mixed according to proportion, not only many processes are added, which increases the screening cost, but also the mixing is not easy to achieve natural uniformity, and the brown corundum is prone to breakage during the large-scale mixing process, which changes the brown corundum particle size, resulting in a large number of unqualified brown corundum products that are not within the 5-8mm particle size range.

[0003] In the prior art, a patent document with the announcement number CN 108940813 A discloses a brown corundum vibrating screen machine, which includes a screen body, and an oblique vibration motor seat is fixedly provided at the inclined position at the bottom of the screen body, and a motor is installed on the motor seat. The motor rotates here to drive the brown corundum particles on the screen body to move toward the discharge port in the horizontal direction and reciprocate up and down in the vertical direction. The above scheme changes the structure of the existing vibrating screen plate and the connection method of each layer of the vibrating screen plate, and then changes the structure of the vibrating screen frame head and the vibrating screen body accordingly, so that the improved vibrating screen can not only match the sieve plates required for the screening of brown corundum of multiple specifications, but also improve the interchangeability and versatility of the structures of the various parts of the vibrating screen, but does not solve the problem of adjusting the particle size distribution and content proportion of the screened brown corundum product. Utility Model Content

[0004] 1. Technical Problems Solved

[0005] In view of the shortcomings of the prior art, the utility model proposes a brown corundum particle size screening device which has a simple structure, is easy to modify and operate, can roughly adjust the particle size distribution and content proportion of the required brown corundum product to be screened out, saves process and screening costs, improves the flexibility of brown corundum screening, and ensures product quality.

[0006] 2. Specific technical solutions

[0007] A brown corundum particle size screening device, comprising a feeding device and at least one particle size screening mechanism, wherein the feeding device is arranged above the particle size screening mechanism, the particle size screening mechanism is provided with a shell structure, in which a first screen structure, a second screen structure and a third screen structure are arranged in sequence from top to bottom, and the mesh numbers of the first screen structure, the second screen structure and the third screen structure increase in sequence, a discharge port is provided on the side of the shell structure, a layered discharge mechanism is installed on the discharge port, and the layered discharge mechanism is provided with a first discharge channel, a second discharge channel and a third discharge channel. The first screen structure, the second screen structure and the third screen structure have side edges aligned with the first discharge channel, the second discharge channel and the third discharge channel respectively; a half-section screen structure is provided above the first screen structure, the half-section screen structure is installed on the shell structure, the side edge of the half-section screen structure is aligned with the first discharge channel, the feeding device is aligned with the half-section screen structure, and the mesh number of the half-section screen structure is more than that of the first screen structure; a vibration mechanism is also provided on the shell structure.

[0008] Preferably, the first screen structure, the second screen structure, the third screen structure and the half-section screen structure are arranged obliquely, and the horizontal heights of the two sides are lower the closer to the layered discharging mechanism.

[0009] Preferably, the area of ​​the half-section screen structure is 10% to 90% of the area of ​​the first screen structure, and at least 10% of the diameter of the discharge port of the feeding device is aligned with the half-section screen structure.

[0010] Preferably, the vibration mechanism comprises a motor vibration seat and a polarization motor, the polarization motor is mounted on the motor vibration seat, and the motor vibration seat is fixedly arranged on the outer wall of the shell structure.

[0011] Preferably, the bottom of the shell structure is in a cone shell shape, and a powder discharge channel is provided at the bottom end of the cone shell of the shell structure, and the third screen structure is used for filtering and removing dust and unqualified broken particles.

[0012] Preferably, the powder discharge channel is connected to a collection device or a dust removal device.

[0013] Preferably, three particle size screening mechanisms are included, namely a first-order particle size screening mechanism, a second-order particle size screening mechanism and a third-order particle size screening mechanism, and a supporting frame structure is also provided. The top of the supporting frame structure is connected and installed on the first-order particle size screening mechanism, the second-order particle size screening mechanism and the third-order particle size screening mechanism through an elastic component, and the stratified discharging mechanism includes a first-order stratified discharging mechanism, a second-order stratified discharging mechanism and a third-order stratified discharging mechanism, and the first-order stratified discharging mechanism, the second-order stratified discharging mechanism and the third-order stratified discharging mechanism are respectively arranged at the discharge ports of the first-order particle size screening mechanism, the second-order particle size screening mechanism and the third-order particle size screening mechanism.

[0014] Preferably, the first-order particle size screening mechanism, the second-order particle size screening mechanism and the third-order particle size screening mechanism are successively lowered by the vertical heights supported by the support frame structure, and the height difference is at least the vertical height of the shell structure;

[0015] The first discharge channel corresponding to the first-stage particle size screening mechanism is connected to the crusher for crushing, the corresponding second discharge channel is connected to the first-stage particle size collection device, and the corresponding third discharge channel is transported to the second-stage particle size screening mechanism through a conveying pipeline;

[0016] The first discharge channel and the second discharge channel corresponding to the second-stage particle size screening mechanism are connected to the second-stage particle size collecting device, and the corresponding third discharge channel is transported to the third-stage particle size screening mechanism;

[0017] The first and second discharge channels corresponding to the three-stage particle size screening mechanism are connected to a three-stage particle size collecting device, and the corresponding third discharge channel is connected to a tailings collecting device.

[0018] Preferably, the vertical heights of the first-stage particle size screening mechanism and the third-stage particle size screening mechanism are both lower than the vertical height of the second-stage particle size screening mechanism;

[0019] The second discharge channel corresponding to the second-stage particle size screening mechanism is connected to a second-stage particle size collecting device, and the corresponding first discharge channel and third discharge channel are respectively transported to the first-stage particle size screening mechanism and the third-stage particle size screening mechanism through a conveying pipeline;

[0020] The first discharge channel and the second discharge channel corresponding to the first-order particle size screening mechanism are connected to a first-order particle size collecting device, and the corresponding third discharge channel is connected to a tailings collecting device;

[0021] The first and second discharge channels corresponding to the three-stage particle size screening mechanism are connected to a three-stage particle size collecting device, and the corresponding third discharge channel is connected to a tailings collecting device.

[0022] Preferably, a bayonet structure is provided on the inner wall of the shell structure, the half-section screen structure consists of a screen and a mounting frame, one side of the mounting frame can be detachably installed in the bayonet structure, and a support bar can also be detachably installed on the shell structure, the support bar is provided at the bottom of the other side of the mounting frame of the half-section screen structure.

[0023] The beneficial effects of the utility model are as follows: when it is necessary to control the particle size distribution and content ratio of the brown corundum product, a half-section screen structure is adopted, through which the part of the brown corundum entering the screening with less content can be removed in advance, and then enter the particle size screening mechanism for vibration filtration, so as to obtain brown corundum products with different particle size distributions and content ratios; then, by adjusting and installing half-section screen structures 205 with different areas, the area above the first screen structure is different, so that the particle size distribution and content ratio of the brown corundum product can be flexibly controlled, thereby improving the flexibility of brown corundum screening and further saving process and screening costs.

[0024] A first-order particle size screening mechanism, a second-order particle size screening mechanism and a third-order particle size screening mechanism are provided, and cooperate with a first-order stratified discharging mechanism, a second-order stratified discharging mechanism and a third-order stratified discharging mechanism, which can screen brown corundum products in different particle size ranges, and screen continuously, saving process and screening costs; a crushed powder discharging channel is also provided, which is connected to a collection device or a dust removal device. In the process of vibrating and screening the particle size of brown corundum by each particle size screening mechanism, dust and local fragments on the brown corundum will be shaken off, and these dust and local fragments will be screened out through the third screen structure each time for centralized treatment, and can be reused, which improves the utilization rate and ensures the quality of subsequent brown corundum products. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the first combination of the utility model as a whole.

[0026] Figure 2 It is a schematic structural diagram of the second combination of the utility model as a whole.

[0027] Figure 3 It is a structural schematic diagram of the cooperation between the medium particle size screening mechanism and the layered discharging mechanism of the utility model.

[0028] Figure 4 It is a schematic diagram of the structure of the layered discharging mechanism in the utility model.

[0029] In the figure: feeding device 1; particle size screening mechanism 2; layered discharging mechanism 3; vibration mechanism 4; powder discharging channel 5; support frame structure 6; first-stage particle size collection device 7; second-stage particle size collection device 8; third-stage particle size collection device 9; tailings collection device 10;

[0030] First-order particle size screening mechanism 21; second-order particle size screening mechanism 22; third-order particle size screening mechanism 23;

[0031] Shell structure 201; first screen structure 202; second screen structure 203; third screen structure 204; half-section screen structure 205;

[0032] First-order stratified discharging mechanism 31; second-order stratified discharging mechanism 32; third-order stratified discharging mechanism 33;

[0033] The first discharge channel 301; the second discharge channel 302; the third discharge channel 303;

[0034] Motor vibration seat 41; polarization motor 42. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0036] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined; in addition, unless otherwise clearly defined and limited, the terms "set", "install", "connected" and "connected" should be understood in a broad sense.

[0037] Example:

[0038] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown: a brown corundum particle size screening device is provided with a feeding device 1 and three particle size screening mechanisms 2, namely a first-order particle size screening mechanism 21, a second-order particle size screening mechanism 22 and a third-order particle size screening mechanism 23, and a supporting frame structure 6 is also provided. The top of the supporting frame structure 6 is connected and installed on the first-order particle size screening mechanism 21, the second-order particle size screening mechanism 22 and the third-order particle size screening mechanism 23 through an elastic component. The supporting frame structure 6 is used to support and install the first-order particle size screening mechanism 21, the second-order particle size screening mechanism 22 and the third-order particle size screening mechanism 23 to different heights respectively. The first-order particle size screening mechanism 21, the second-order particle size screening mechanism 22 and the third-order particle size screening mechanism 23 respectively screen brown corundum products of different particle size ranges, and screen continuously, saving process and screening costs.

[0039] The feeding device 1 is arranged above one of the particle size screening mechanisms 2. Alternatively, only one particle size screening mechanism 2 may be arranged, or one particle size screening mechanism 2 or more particle size screening mechanisms 2 may be arranged. The structures of all the particle size screening mechanisms 2 are almost the same, that is, the structures of the first-order particle size screening mechanism 21, the second-order particle size screening mechanism 21 and the third-order particle size screening mechanism 21 are the same, and are as follows:

[0040] The particle size screening mechanism 2 is provided with a shell structure 201, in which a first screen structure 202, a second screen structure 203 and a third screen structure 204 are arranged from top to bottom in sequence, and the mesh numbers of the first screen structure 202, the second screen structure 203 and the third screen structure 204 are increased in sequence, and a discharge port is provided on the side of the shell structure 201, and a stratified discharge mechanism 3 is installed on the discharge port, that is, the stratified discharge mechanism 3 includes a first-order stratified discharge mechanism 31, a second-order stratified discharge mechanism 32 and a third-order stratified discharge mechanism 33, and the first-order stratified discharge mechanism 31, the second-order stratified discharge mechanism 32 and the third-order stratified discharge mechanism 33 are respectively arranged at the discharge ports of the first-order particle size screening mechanism 21, the second-order particle size screening mechanism 22 and the third-order particle size screening mechanism 23, and each stratified discharge mechanism 3 has a similar structure, and is as follows:

[0041] like Figure 3 and Figure 4 As shown, the above-mentioned layered discharge mechanism 3 is provided with a first discharge channel 301, a second discharge channel 302 and a third discharge channel 303, and the side edges of the first screen structure 202, the second screen structure 203 and the third screen structure 204 are respectively aligned with the first discharge channel 301, the second discharge channel 302 and the third discharge channel 303, and the outlet orientations of the first discharge channel 301, the second discharge channel 302 and the third discharge channel 303 are adjusted according to the use environment, that is, adaptive changes are made during the manufacturing process. The first screen structure 202, the second screen structure 203, the third screen structure 204 and the half-section screen structure 205 are arranged tilted, and the horizontal height is lower the closer to the layered discharge mechanism 3, so that the screen structure can slide into the layered discharge mechanism 3 during the vibration process.

[0042] A half-section screen structure 205 is also provided above the first screen structure 202. The half-section screen structure 205 is installed on the shell structure 201. The side edge of the half-section screen structure 205 is aligned with the first discharge channel 301, and the feeding device 1 is aligned with the half-section screen structure 205. The number of meshes of the half-section screen structure 205 is greater than that of the first screen structure 202. The half-section screen structure 205 is not required for every particle size screening mechanism 2. The half-section screen structure 205 is only used when it is necessary to control the particle size distribution and content ratio of the brown corundum product. The half-section screen structure 205 can be used to remove the part with less content of the brown corundum entering the screening in advance, and then enter the particle size screening mechanism 2 for vibration filtration to obtain brown corundum products with different particle size distribution and content ratio.

[0043] The area of ​​the half-section screen structure 205 is 10% to 90% of the area of ​​the first screen structure 202, and at least 10% of the diameter of the discharge port of the feeding device 1 is aligned with the half-section screen structure 205. By adjusting and installing half-section screen structures 205 of different areas and covering different areas above the first screen structure 202, the particle size distribution and content ratio of the brown corundum product can be flexibly controlled, thereby improving the flexibility of brown corundum screening and further saving process and screening costs.

[0044] In addition, a bayonet structure is provided on the inner wall of the shell structure 201, and the half-section screen structure 205 consists of a screen and a mounting frame. One side of the mounting frame can be detachably installed in the bayonet structure, which is convenient for replacing the half-section screen structures 205 of different areas. The first screen structure 202, the second screen structure 203 and the third screen structure 204 are similar in structure, except that the mesh numbers of the screens are different, or they can be disassembled and removed when the half-section screen structure 205 is not needed. Similarly, a support bar can be detachably installed on the shell structure 201, and the support bar is arranged at the bottom of the other side of the mounting frame of the half-section screen structure 205, which is beneficial to improve the bearing capacity of the half-section screen structure 205.

[0045] The above-mentioned feeding device 1 can be directly transported from the crusher to the top of one of the particle size screening mechanisms 2 through an inclined platform, or a feeding pipeline and an auger structure can be arranged to transport the feed, wherein the auger structure is rotatably installed in the feeding pipeline.

[0046] A vibration mechanism 4 is also provided on the shell structure 201 . The vibration mechanism 4 includes a motor vibration seat 41 and a polarization motor 42 . The polarization motor 42 is installed on the motor vibration seat 41 . The motor vibration seat 41 is fixedly provided on the outer wall of the shell structure 201 .

[0047] The bottom of the shell structure 201 is in the shape of a cone shell, and a powder discharge channel 5 is arranged at the bottom end of the cone shell of the shell structure 201. The third screen structure 204 is used to filter and remove dust and unqualified particles, so the powder discharge channel 5 is connected to a collection device or a dust removal device. In the process of each particle size screening mechanism 2 vibrating and screening the brown corundum particle size, the dust and local fragments on the brown corundum will be shaken off. These dust and local fragments are screened out through the third screen structure 204 each time for centralized treatment and can be reused, which improves the utilization rate and ensures the quality of subsequent brown corundum products.

[0048] Furthermore, if Figure 1 As shown, the first-stage particle size screening mechanism 21, the second-stage particle size screening mechanism 22 and the third-stage particle size screening mechanism 23 are successively lowered by the vertical height supported by the support frame structure 6, and the height difference is at least the vertical height of the shell structure 201;

[0049] The first discharge channel 301 corresponding to the first-stage particle size screening mechanism 21 is connected to the crusher for crushing, and then returned for screening. The corresponding second discharge channel 302 is connected to the first-stage particle size collecting device 7. The corresponding third discharge channel 303 is transported to the second-stage particle size screening mechanism 22 through the conveying pipeline, and can also be directly transported to the second-stage particle size screening mechanism 22.

[0050] The first discharge channel 301 and the second discharge channel 302 corresponding to the second-stage particle size screening mechanism 22 are connected to the second-stage particle size collecting device 8, and the corresponding third discharge channel 303 is transported to the third-stage particle size screening mechanism 23;

[0051] The first discharging channel 301 and the second discharging channel 302 corresponding to the third-stage particle size screening mechanism 23 are connected to the third-stage particle size collecting device 9, and the corresponding third discharging channel 303 is connected to the tailings collecting device 10. This is a method of screening the brown corundum products in sequence from a large range to a small range, wherein the brown corundum products collected by the first-stage particle size collecting device 7 have the largest particle size range, followed by the brown corundum products collected by the second-stage particle size collecting device 8, and finally the brown corundum products collected by the third-stage particle size collecting device 9. It can be extended in sequence within reasonable precautions, and only the particle size screening mechanism 2 and the layered discharging mechanism 3 need to be added.

[0052] Furthermore, if Figure 2 As shown, the vertical heights of the first-stage particle size screening mechanism 21 and the third-stage particle size screening mechanism 23 are both lower than the vertical height of the second-stage particle size screening mechanism 22;

[0053] The second discharge channel 302 corresponding to the second-stage particle size screening mechanism 22 is connected to the second-stage particle size collecting device 8, and the corresponding first discharge channel 301 and third discharge channel 303 are respectively transported to the first-stage particle size screening mechanism 21 and the third-stage particle size screening mechanism 23 through the conveying pipeline. Similarly, they can also be directly transported to the first-stage particle size screening mechanism 21 and the third-stage particle size screening mechanism 23;

[0054] The first discharge channel 301 and the second discharge channel 302 corresponding to the first-stage particle size screening mechanism 21 are connected to the first-stage particle size collecting device 7, and the corresponding third discharge channel 303 is connected to the tailings collecting device 10;

[0055] The first discharging channel 301 and the second discharging channel 302 corresponding to the third-order particle size screening mechanism 23 are connected to the third-order particle size collecting device 9, and the corresponding third discharging channel 303 is connected to the tailings collecting device 10, which is used when it is determined that there will be no unqualified brown corundum products after screening. The screening starts with the brown corundum products in the middle particle size range, and then the dichotomy is used to screen the brown corundum products in the large particle size range and the brown corundum products in the small particle size range respectively. Similarly, the brown corundum products collected by the first-order particle size collecting device 7 have the largest particle size range, followed by the brown corundum products collected by the second-order particle size collecting device 8, and finally the brown corundum products collected by the third-order particle size collecting device 9. Under reasonable precautions, the dichotomy screening can be continued, and the screening efficiency is higher, but the connection and transmission relationship of the particle size screening mechanisms 2 will be complicated if there are too many of them.

[0056] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention shall be defined by the appended claims.

Claims

1. A brown corundum particle size screening device, characterized in that: The invention comprises a feeding device (1) and at least one particle size screening mechanism (2), wherein the feeding device (1) is arranged above the particle size screening mechanism (2), the particle size screening mechanism (2) is provided with a shell structure (201), a first screen structure (202), a second screen structure (203) and a third screen structure (204) are arranged in sequence from top to bottom in the shell structure (201), a discharge port is provided on the side of the shell structure (201), a layered discharge mechanism (3) is installed on the discharge port, the layered discharge mechanism (3) is provided with a first discharge channel (301), a second discharge channel (302) and a third discharge channel (303), the first screen structure (202), the second screen structure (203) and the third discharge channel (304) are arranged in sequence from top to bottom The side edges of the first screen structure (203) and the third screen structure (204) are aligned with the first discharge channel (301), the second discharge channel (302) and the third discharge channel (303) respectively; a half-section screen structure (205) is further arranged above the first screen structure (202); the half-section screen structure (205) is mounted on the shell structure (201); the side edges of the half-section screen structure (205) are aligned with the top of the first discharge channel (301); the feeding device (1) is aligned with the half-section screen structure (205); the mesh number of the half-section screen structure (205) is greater than the mesh number of the first screen structure (202); and a vibration mechanism (4) is further arranged on the shell structure (201).

2. The brown corundum particle size screening device according to claim 1, characterized in that: The first screen structure (202), the second screen structure (203), the third screen structure (204), and the half-section screen structure (205) are arranged at an inclination, and the horizontal height of each of them decreases as the side closer to the layered discharge mechanism (3) is approached.

3. The brown corundum particle size screening device according to claim 1 or 2, characterized in that: The area of ​​the half-section screen structure (205) is 10% to 90% of the area of ​​the first screen structure (202), and at least 10% of the caliber of the discharge port of the feeding device (1) is aligned with the half-section screen structure (205).

4. The brown corundum particle size screening device according to claim 3, characterized in that: The vibration mechanism (4) comprises a motor vibration seat (41) and a polarization motor (42); the polarization motor (42) is mounted on the motor vibration seat (41); and the motor vibration seat (41) is fixedly arranged on the outer wall of the housing structure (201).

5. The brown corundum particle size screening device according to any one of claims 1, 2 or 4, characterized in that: The bottom of the shell structure (201) is in the shape of a cone shell, and a powder discharge channel (5) is provided at the bottom end of the cone shell of the shell structure (201). The third screen structure (204) is used to filter and remove dust and unqualified particles.

6. The brown corundum particle size screening device according to claim 5, characterized in that: The powder discharge channel (5) is connected to a collection device or a dust removal device.

7. The brown corundum particle size screening device according to any one of claims 1, 2, 4 or 5, characterized in that: The invention comprises three particle size screening mechanisms (2), namely a first-order particle size screening mechanism (21), a second-order particle size screening mechanism (22) and a third-order particle size screening mechanism (23); a support frame structure (6) is also provided, the top of the support frame structure (6) is connected and installed on the first-order particle size screening mechanism (21), the second-order particle size screening mechanism (22) and the third-order particle size screening mechanism (23) through an elastic component; and the stratified discharging mechanism (3) comprises a first-order stratified discharging mechanism (31), a second-order stratified discharging mechanism (32) and a third-order particle size screening mechanism (33). The first-order stratified discharging mechanism (31), the second-order stratified discharging mechanism (32) and the third-order stratified discharging mechanism (33) are respectively arranged at the discharging ports of the first-order particle size screening mechanism (21), the second-order particle size screening mechanism (22) and the third-order particle size screening mechanism (23); the supporting frame structure (6) is used to support and install the first-order particle size screening mechanism (21), the second-order particle size screening mechanism (22) and the third-order particle size screening mechanism (23) at different heights.

8. The brown corundum particle size screening device according to claim 7, characterized in that: The first-stage particle size screening mechanism (21), the second-stage particle size screening mechanism (22), and the third-stage particle size screening mechanism (23) are successively lowered in vertical height through the support frame structure (6), and the height difference is at least the vertical height of the shell structure (201); The first discharge channel (301) corresponding to the first-stage particle size screening mechanism (21) is connected to the crusher for crushing, the corresponding second discharge channel (302) is connected to the first-stage particle size collection device (7), and the corresponding third discharge channel (303) is transported to the second-stage particle size screening mechanism (22) through a transport pipeline; The first discharge channel (301) and the second discharge channel (302) corresponding to the second-stage particle size screening mechanism (22) are connected to a second-stage particle size collecting device (8), and the corresponding third discharge channel (303) is transported to the third-stage particle size screening mechanism (23); The first discharge channel (301) and the second discharge channel (302) corresponding to the three-stage particle size screening mechanism (23) are connected to a three-stage particle size collecting device (9), and the corresponding third discharge channel (303) is connected to a tailings collecting device (10).

9. The brown corundum particle size screening device according to claim 7, characterized in that: The vertical heights of the first-stage particle size screening mechanism (21) and the third-stage particle size screening mechanism (23) are both lower than the vertical height of the second-stage particle size screening mechanism (22); The second discharge channel (302) corresponding to the second-stage particle size screening mechanism (22) is connected to a second-stage particle size collecting device (8), and the corresponding first discharge channel (301) and third discharge channel (303) are respectively transported to the first-stage particle size screening mechanism (21) and the third-stage particle size screening mechanism (23) through a transport pipeline; The first discharge channel (301) and the second discharge channel (302) corresponding to the first-order particle size screening mechanism (21) are connected to a first-order particle size collecting device (7), and the corresponding third discharge channel (303) is connected to a tailings collecting device (10); The first discharge channel (301) and the second discharge channel (302) corresponding to the three-stage particle size screening mechanism (23) are connected to a three-stage particle size collecting device (9), and the corresponding third discharge channel (303) is connected to a tailings collecting device (10).

10. The brown corundum particle size screening device according to any one of claims 1, 2, 4, 5, 8 or 9, characterized in that: A bayonet structure is provided on the inner wall of the shell structure (201); the half-section screen structure (205) is composed of a screen and a mounting frame; one side of the mounting frame is detachably mounted in the bayonet structure; a support bar is also detachably mounted on the shell structure (201); the support bar is provided at the bottom of the other side of the mounting frame of the half-section screen structure (205).

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