Iron ore beneficiation fine grinding and screening experimental device and construction method thereof

Abstract

The invention discloses an iron ore beneficiation fine grinding and screening experimental device and a construction method thereof, and relates to the field of magnetite screening. The device comprises a screening box, a screening assembly is arranged in the screening box, a driving assembly is arranged in the screening box, the driving assembly is matched with the screening assembly, and a grinding box is arranged at the top of the screening box. Magnehemite is ground through the grinding assembly in the grinding box, ground maghemite powder enters the screening box through the communicating pipe, graded screening is conducted through the screening assembly, and the screened large-particle maghemite powder and medium-particle maghemite powder enter the material receiving box through the through groove; the large-particle maghemite powder and the medium-particle maghemite powder in the material receiving box enter the feeding box through the conveying pipe, and the large-particle maghemite powder and the medium-particle maghemite powder are fed into the grinding box again through the feeding assembly and the connecting pipe for secondary grinding, so that the material transfer time is shortened, and the machining efficiency is improved; and the working intensity of workers is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of magnetite screening, and in particular to an iron ore dressing fine grinding and screening experimental device and a construction method thereof. Background Art

[0002] Iron ore generally exists in the form of oxides. After mining, iron ore needs to be crushed to obtain iron ore powder. The crushed iron ore powder contains large particles and medium particles, which need to be further classified for further sorting.

[0003] The Chinese patent application number CN201921057452.8 discloses a magnetite screening device, which includes a screening cabinet, a fixed cover plate covered on the second side of the top of the screening cabinet, a vibration motor fixed to the top surface of the fixed cover plate, a first inclined screen fixed in the screening cabinet, a second inclined screen fixed in the screening cabinet and located below the first inclined screen, a third inclined screen fixed in the screening cabinet and located below the second inclined screen, a fourth inclined screen fixed in the screening cabinet and located below the third inclined screen, and elastic supports fixed at the four corners of the bottom of the screening cabinet, the second end of the first inclined screen extends out of the second side wall of the screening cabinet to form a first discharge port, a first material receiving frame is fixed outside the second side wall of the screening cabinet and located below the first discharge port, and the first end of the second inclined screen extends out of the first side wall of the screening cabinet to form a second discharge port.

[0004] The above patent starts the vibration motor to drive the entire screening cabinet to vibrate. The vibration energy provided by the vibration motor is used to drive the entire device to vibrate. The amplitude is low, so the screening efficiency is low. Although the hematite can be finely screened by multi-level classification according to volume, large and medium-sized magnetite powders still need to be manually transferred to the grinding mill for secondary processing, which increases material transfer and processing time and reduces work efficiency.

[0005] Therefore, we made improvements on this and proposed an iron ore dressing fine grinding and screening experimental device and its construction method. Summary of the invention

[0006] The purpose of the present invention is to manually transfer large and medium-sized magnetite powders to a grinding mill for secondary processing, which increases material transfer and processing time and reduces work efficiency.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] An iron ore dressing fine grinding and screening experimental device and a construction method thereof are provided to improve the above problems.

[0009] The specific application is as follows:

[0010] It includes a screening box, a screening assembly is arranged in the screening box, a driving assembly is arranged in the screening box, the driving assembly cooperates with the screening assembly, a grinding box is installed on the top of the screening box, a grinding assembly is arranged in the grinding box, a connecting pipe is installed between the grinding box and the screening box, a material receiving box is installed on the side of the screening box, a through groove is opened between the screening box and the material receiving box, a feeding box is installed on the side of the material receiving box, a feeding assembly is arranged in the feeding box, a conveying pipe is installed between the material receiving box and the feeding box, and a connecting pipe is installed between the feeding box and the grinding box.

[0011] The hematite is ground by the grinding assembly in the grinding box, the ground hematite powder enters the screening box through the connecting pipe, and is graded and screened by the screening assembly, the screened large-particle hematite powder and medium-particle hematite powder enter the receiving box through the through slot, the large-particle hematite powder and medium-particle hematite powder in the receiving box enter the feeding box through the conveying pipe, and the large-particle hematite powder and medium-particle hematite powder are sent into the grinding box again through the feeding assembly and the connecting pipe for secondary grinding, thereby reducing material transfer time, improving processing efficiency, and reducing workers' work intensity.

[0012] As a preferred embodiment of the iron ore beneficiation fine grinding and screening experimental device and its construction method provided by the present invention, an installation groove is opened on the inner wall of the screening box, the bottom of the inner cavity of the screening box is inclined, and a discharge pipe is installed at the bottom of the side of the screening box. The screening assembly includes a limit rod installed in the installation groove, and the side of the limit rod is slidably matched with a sliding cylinder, and a screen plate is installed on the side of the sliding cylinder. A spring is installed between the bottom end of the sliding cylinder and the installation groove, and an extrusion plate is installed on the top of the sliding cylinder, and the extrusion plate cooperates with the driving assembly.

[0013] As a preferred embodiment of the iron ore beneficiation fine grinding and screening experimental device and its construction method provided by the present invention, the driving assembly includes a rotating rod rotatably engaged with the inner wall of the mounting groove, a first motor is installed on the side of the screening box, the output end of the first motor is fixedly connected to the rotating rod, and two extrusion protrusions are installed on the side of the rotating rod, and the extrusion protrusions cooperate with the extrusion plate.

[0014] As a preferred embodiment of the iron ore beneficiation fine grinding and screening experimental device and its construction method provided by the present invention, the grinding assembly includes a second motor installed on the top of the grinding box, the inner wall of the grinding box is equipped with a plurality of grinding blocks, the inner sides of the plurality of grinding blocks are provided with grinding grooves, a driving rod is rotatably matched inside the grinding box, a rotating roller is installed on the side of the driving rod, a plurality of grinding rings are installed on the side of the rotating roller, and the grinding rings cooperate with the grinding grooves.

[0015] As a preferred embodiment of the iron ore beneficiation fine grinding and screening experimental device and its construction method provided by the present invention, a feed funnel is installed on the top of the grinding box, and a feed plate is installed at the bottom of the inner cavity of the grinding box. The feed plate is movably connected to the driving rod, and the upper surface of the feed plate is inclined. The grinding box is connected to the screening box through a connecting pipe.

[0016] As a preferred embodiment of the iron ore beneficiation fine grinding and screening experimental device and its construction method provided by the present invention, the feeding assembly includes a spiral feeding rod rotatably engaged in a feeding box, a third motor is installed on the top of the feeding box, the output end of the third motor is fixedly connected to the feeding box, the feeding box is connected to the grinding box through a connecting pipe, and the feeding box is connected to the receiving box through a conveying pipe.

[0017] A construction method of an iron ore beneficiation fine grinding and screening experimental device, comprising the above-mentioned iron ore beneficiation fine grinding and screening experimental device, and the specific operation is as follows:

[0018] When in use, the hematite is ground by the grinding assembly in the grinding box, the ground hematite powder enters the screening box through the connecting pipe, and is graded and screened by the screening assembly, the screened large-particle hematite powder and medium-particle hematite powder enter the receiving box through the through slot, the large-particle hematite powder and medium-particle hematite powder in the receiving box enter the feeding box through the conveying pipe, and the large-particle hematite powder and medium-particle hematite powder are sent to the grinding box again through the feeding assembly and the connecting pipe for secondary grinding, thereby reducing material transfer time, improving processing efficiency, and reducing the work intensity of workers;

[0019] When in use, the device is first powered on, and then the hematite is added into the grinding box through the feeding funnel, and the second motor is started, the second motor drives the driving rod to rotate, the driving rod rotates to drive the rotating roller, and the rotating roller rotates to drive multiple grinding rings to rotate in the grinding groove, so that the hematite is ground multiple times to improve the grinding effect. The ground hematite powder is guided by the feeding plate to the connecting pipe, enters the screening box through the connecting pipe, and is graded and screened by the screening component. The large-particle hematite powder and the medium-particle hematite powder screened out are The ore powder enters the receiving box through the through slot. Since the bottom of the inner cavity of the receiving box is inclined, the large-grained hematite powder and the medium-grained hematite powder in the receiving box are guided into the conveying pipe, and then enter the feeding box through the conveying pipe. Then the third motor is started, and the third motor drives the spiral feeding rod to rotate. The spiral feeding rod transports the large-grained hematite powder and the medium-grained hematite powder to the connecting pipe, and then the large-grained hematite powder and the medium-grained hematite powder are sent to the grinding box again through the connecting pipe for secondary grinding, thereby reducing the material transfer time, improving the processing efficiency, and reducing the work intensity of the workers.

[0020] When in use, by starting the first motor, the first motor drives the two extrusion protrusions to rotate through the rotating rod, so that the two extrusion protrusions reciprocate and squeeze the corresponding extrusion plates respectively, and under the cooperation of the extrusion protrusions reciprocatingly squeezing the extrusion plates and the spring, the extrusion plate drives the sliding cylinder to slide reciprocatingly on the limit rod, and the reciprocating sliding of the sliding cylinder drives the screen plate to move reciprocatingly up and down, thereby increasing the amplitude, which is beneficial to improving the screening efficiency of the screen plate, and the fine-grained hematite powder falls to the bottom of the inner cavity of the screening box through the screening of the two screen plates. Since the bottom of the inner cavity of the screening box is inclined, the fine-grained hematite powder is guided, so that the fine-grained hematite powder is discharged through the discharge pipe.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention grinds the hematite by means of a grinding assembly in a grinding box, the ground hematite powder enters a screening box through a connecting pipe, is graded and screened by the screening assembly, the screened large-particle hematite powder and medium-particle hematite powder enter a receiving box through a through slot, the large-particle hematite powder and medium-particle hematite powder in the receiving box enter a feeding box through a conveying pipe, the large-particle hematite powder and medium-particle hematite powder are again fed into the grinding box through the feeding assembly and the connecting pipe for secondary grinding, thereby reducing material transfer time, improving processing efficiency, and reducing the work intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the three-dimensional structure of the iron ore beneficiation fine grinding and screening experimental device and its construction method provided in this application;

[0024] Figure 2A schematic cross-sectional structure diagram of an iron ore dressing fine grinding and screening experimental device and a construction method thereof provided in this application;

[0025] Figure 3 A schematic diagram of the cross-sectional structure of the grinding box of the iron ore beneficiation fine grinding and screening experimental device and its construction method provided in this application;

[0026] Figure 4 A schematic diagram of the cross-sectional structure of the screening box of the iron ore beneficiation fine grinding and screening experimental device and its construction method provided in this application;

[0027] Figure 5 A schematic diagram of the cross-sectional structure of the feed box of the iron ore beneficiation fine grinding and screening experimental device and its construction method provided in this application.

[0028] Indicated in the figure:

[0029] 1. Screening box; 2. Grinding box; 3. Receiving box; 4. Feeding box; 5. Mounting slot; 6. Limit rod; 7. Sliding cylinder; 8. Screen plate; 9. Spring; 10. First motor; 11. Rotating rod; 12. Extrusion convex block; 13. Extrusion plate; 14. Discharge pipe; 15. Through slot; 16. Grinding block; 17. Feeding funnel; 18. Connecting pipe; 19. Second motor; 20. Rotating roller; 21. Grinding ring; 22. Feeding plate; 23. Third motor; 24. Screw feeding rod; 25. Connecting pipe; 26. Conveying pipe. DETAILED DESCRIPTION

[0030] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0031] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] As described in the background art, for large and medium-sized magnetite powders, it is necessary to manually transfer the large and medium-sized magnetite powders to a grinding mill for secondary processing, which increases material transfer and processing time and reduces work efficiency.

[0036] In order to solve this technical problem, the present invention provides an iron ore dressing fine grinding and screening experimental device and a construction method thereof.

[0037] Specifically, please refer to Figure 1-5 The iron ore beneficiation fine grinding and screening experimental device and its construction method specifically include a screening box 1, a screening assembly is arranged in the screening box 1, a driving assembly is arranged in the screening box 1, the driving assembly cooperates with the screening assembly, a grinding box 2 is installed on the top of the screening box 1, a grinding assembly is arranged in the grinding box 2, a connecting pipe 18 is installed between the grinding box 2 and the screening box 1, a material receiving box 3 is installed on the side of the screening box 1, a through groove 15 is opened between the screening box 1 and the material receiving box 3, a feeding box 4 is installed on the side of the material receiving box 3, a feeding assembly is arranged in the feeding box 4, a conveying pipe 26 is installed between the material receiving box 3 and the feeding box 4, and a connecting pipe 25 is installed between the feeding box 4 and the grinding box 2.

[0038] The hematite is ground by the grinding assembly in the grinding box 2, and the ground hematite powder enters the screening box 1 through the connecting pipe 18, and is graded and screened by the screening assembly. The screened large-particle hematite powder and medium-particle hematite powder enter the receiving box 3 through the through groove 15, and the large-particle hematite powder and medium-particle hematite powder in the receiving box 3 enter the feeding box 4 through the conveying pipe 26, and the large-particle hematite powder and the medium-particle hematite powder are sent into the grinding box 2 again for secondary grinding through the feeding assembly and the connecting pipe 25, thereby reducing the material transfer time, improving the processing efficiency, and reducing the work intensity of the workers.

[0039] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] Example 1

[0043] Please refer to Figure 1-5 , an iron ore beneficiation fine grinding and screening experimental device and a construction method thereof, comprising a screening box 1, a screening assembly is arranged in the screening box 1, a driving assembly is arranged in the screening box 1, the driving assembly cooperates with the screening assembly, a grinding box 2 is arranged on the top of the screening box 1, a grinding assembly is arranged in the grinding box 2, a connecting pipe 18 is arranged between the grinding box 2 and the screening box 1, a material receiving box 3 is arranged on the side of the screening box 1, a through groove 15 is opened between the screening box 1 and the material receiving box 3, a feeding box 4 is arranged on the side of the material receiving box 3, a feeding assembly is arranged in the feeding box 4, a conveying pipe 26 is arranged between the material receiving box 3 and the feeding box 4, and a connecting pipe 25 is arranged between the feeding box 4 and the grinding box 2.

[0044] The grinding assembly includes a second motor 19 installed on the top of the grinding box 2. The inner wall of the grinding box 2 is equipped with multiple grinding blocks 16. The inner sides of the multiple grinding blocks 16 are all provided with grinding grooves. A driving rod is rotated in the grinding box 2. A rotating roller 20 is installed on the side of the driving rod. A plurality of grinding rings 21 are installed on the side of the rotating roller 20. The grinding rings 21 cooperate with the grinding grooves.

[0045] A feed hopper 17 is installed on the top of the grinding box 2, and a feed plate 22 is installed at the bottom of the inner cavity of the grinding box 2. The feed plate 22 is movably connected to the driving rod, and the upper surface of the feed plate 22 is inclined. The grinding box 2 is connected to the screening box 1 through a connecting pipe 18.

[0046] The feeding assembly includes a spiral feeding rod 24 rotatably engaged in the feeding box 4. A third motor 23 is installed on the top of the feeding box 4. The output end of the third motor 23 is fixedly connected to the feeding box 4. The feeding box 4 is connected to the grinding box 2 through a connecting pipe 25. The feeding box 4 is connected to the receiving box 3 through a conveying pipe 26.

[0047] Implementation process: When in use, firstly, the device is powered on, and then the hematite is added into the grinding box 2 through the feeding funnel 17, and the second motor 19 is started, the second motor 19 drives the driving rod to rotate, the driving rod rotates to drive the rotating roller 20, and the rotating roller 20 rotates to drive multiple grinding rings 21 to rotate in the grinding groove, so as to grind the hematite multiple times to improve the grinding effect, and the ground hematite powder is guided by the feeding plate 22 to reach the connecting pipe 18, and enters the screening box 1 through the connecting pipe 18, and is graded and screened by the screening component, and the screened large-particle hematite powder and medium-particle hematite powder are The iron ore powder enters the receiving box 3 through the through groove 15. Since the bottom of the inner cavity of the receiving box 3 is inclined, the large-grained hematite ore powder and the medium-grained hematite ore powder in the receiving box 3 are guided into the conveying pipe 26, and then enter the feeding box 4 through the conveying pipe 26. Then the third motor 23 is started, and the third motor 23 drives the spiral feeding rod 24 to rotate. The spiral feeding rod 24 transports the large-grained hematite ore powder and the medium-grained hematite ore powder to the connecting pipe 25, and then they are sent to the grinding box 2 again through the connecting pipe 25 for secondary grinding, thereby reducing the material transfer time, improving the processing efficiency, and reducing the work intensity of the workers.

[0048] Example 2

[0049] An installation groove 5 is opened on the inner wall of the screening box 1, the bottom of the inner cavity of the screening box 1 is inclined, a discharge pipe 14 is installed at the bottom of the side of the screening box 1, and the screening assembly includes a limiting rod 6 installed in the installation groove 5, and a sliding cylinder 7 is slidably matched on the side of the limiting rod 6, and a screen plate 8 is installed on the side of the sliding cylinder 7. A spring 9 is installed between the bottom end of the sliding cylinder 7 and the installation groove 5, and an extrusion plate 13 is installed on the top of the sliding cylinder 7, and the extrusion plate 13 cooperates with the driving assembly.

[0050] The driving assembly includes a rotating rod 11 rotatably engaged with the inner wall of the mounting groove 5. A first motor 10 is installed on the side of the screening box 1. The output end of the first motor 10 is fixedly connected to the rotating rod 11. Two extrusion protrusions 12 are installed on the side of the rotating rod 11. The extrusion protrusions 12 cooperate with the extrusion plate 13.

[0051] Implementation process: When in use, by starting the first motor 10, the first motor 10 drives the two extrusion protrusions 12 to rotate through the rotating rod 11, so that the two extrusion protrusions 12 reciprocate and squeeze the corresponding extrusion plates 13 respectively, and under the cooperation of the extrusion protrusions 12 reciprocatingly squeeze the extrusion plates 13 and the spring 9, the extrusion plate 13 drives the sliding cylinder 7 to slide reciprocatingly on the limiting rod 6, and the reciprocating sliding of the sliding cylinder 7 drives the screen plate 8 to move up and down reciprocatingly, thereby increasing the amplitude, which is beneficial to improving the screening efficiency of the screen plate 8. Through the screening of the two screen plates 8, the fine-grained hematite powder falls to the bottom of the inner cavity of the screening box 1. Since the bottom of the inner cavity of the screening box 1 is inclined, the fine-grained hematite powder is guided, which is convenient for the fine-grained hematite powder to be discharged through the discharge pipe 14.

[0052] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the invention are included in the scope of the claims of the present invention.

Claims

1. An iron ore beneficiation fine grinding and screening experimental device, characterized in that: The invention comprises a screening box (1), wherein a screening assembly is arranged in the screening box (1), wherein a driving assembly is arranged in the screening box (1), wherein the driving assembly cooperates with the screening assembly, wherein a grinding box (2) is arranged on the top of the screening box (1), wherein a grinding assembly is arranged in the grinding box (2), wherein a connecting pipe (18) is arranged between the grinding box (2) and the screening box (1), wherein a material receiving box (3) is arranged on the side of the screening box (1), wherein a through groove (15) is provided between the screening box (1) and the material receiving box (3), wherein a feeding box (4) is arranged on the side of the material receiving box (3), wherein a feeding assembly is arranged in the feeding box (4), wherein a conveying pipe (26) is arranged between the material receiving box (3) and the feeding box (4), and wherein a connecting pipe (25) is arranged between the feeding box (4) and the grinding box (2).

2. The iron ore dressing fine grinding and screening experimental device according to claim 1 is characterized in that: The inner wall of the screening box (1) is provided with a mounting groove (5), the bottom of the inner cavity of the screening box (1) is inclined, the bottom of the side of the screening box (1) is provided with a discharge pipe (14), the screening assembly comprises a limit rod (6) installed in the mounting groove (5), the side of the limit rod (6) is slidably matched with a sliding cylinder (7), the side of the sliding cylinder (7) is provided with a screen plate (8), a spring (9) is provided between the bottom end of the sliding cylinder (7) and the mounting groove (5), the top end of the sliding cylinder (7) is provided with an extrusion plate (13), and the extrusion plate (13) cooperates with the driving assembly.

3. The iron ore dressing fine grinding and screening experimental device according to claim 2 is characterized in that: The driving assembly comprises a rotating rod (11) rotatably engaged with the inner wall of the mounting groove (5); a first motor (10) is mounted on the side of the screening box (1); an output end of the first motor (10) is fixedly connected to the rotating rod (11); two extrusion protrusions (12) are mounted on the side of the rotating rod (11); the extrusion protrusions (12) are engaged with the extrusion plates (13).

4. The iron ore beneficiation fine grinding and screening experimental device according to claim 1 is characterized in that: The grinding assembly comprises a second motor (19) mounted on the top of a grinding box (2); a plurality of grinding blocks (16) are mounted on the inner wall of the grinding box (2); grinding grooves are formed on the inner sides of the plurality of grinding blocks (16); a driving rod is rotatably mounted in the grinding box (2); a rotating roller (20) is mounted on the side of the driving rod; a plurality of grinding rings (21) are mounted on the side of the rotating roller (20); and the grinding rings (21) are matched with the grinding grooves.

5. The iron ore dressing fine grinding and screening experimental device according to claim 4 is characterized in that: A feeding funnel (17) is installed on the top of the grinding box (2), and a feeding plate (22) is installed at the bottom of the inner cavity of the grinding box (2). The feeding plate (22) is movably connected to the driving rod, and the upper surface of the feeding plate (22) is inclined. The grinding box (2) is connected to the screening box (1) through a connecting pipe (18).

6. The iron ore dressing fine grinding and screening experimental device according to claim 1 is characterized in that: The feeding assembly comprises a spiral feeding rod (24) rotatably engaged in a feeding box (4); a third motor (23) is mounted on the top of the feeding box (4); an output end of the third motor (23) is fixedly connected to the feeding box (4); the feeding box (4) is connected to the grinding box (2) via a connecting pipe (25); and the feeding box (4) is connected to the receiving box (3) via a conveying pipe (26).

7. A construction method for an iron ore beneficiation fine grinding and screening experimental device, characterized in that: The iron ore dressing fine grinding and screening experimental device according to claim 1 is specifically operated as follows: When in use, the hematite is ground by the grinding assembly in the grinding box (2), the ground hematite powder enters the screening box (1) through the connecting pipe (18), and is graded and screened by the screening assembly. The screened large-particle hematite powder and medium-particle hematite powder enter the receiving box (3) through the through groove (15), and the large-particle hematite powder and medium-particle hematite powder in the receiving box (3) enter the feeding box (4) through the conveying pipe (26), and the large-particle hematite powder and medium-particle hematite powder are sent to the grinding box (2) again through the feeding assembly and the connecting pipe (25) for secondary grinding, thereby reducing material transfer time, improving processing efficiency, and reducing the work intensity of workers; When in use, the device is first powered on, and then the hematite is added into the grinding box (2) through the feeding funnel (17). The second motor (19) is started, and the second motor (19) drives the driving rod to rotate. The driving rod rotates to drive the rotating roller (20). The rotating roller (20) rotates to drive multiple grinding rings (21) to rotate in the grinding groove, thereby grinding the hematite multiple times to improve the grinding effect. The ground hematite powder is guided by the feeding plate (22) to reach the connecting pipe (18), and enters the screening box (1) through the connecting pipe (18). It is graded and screened by the screening component. The large-particle hematite powder and the medium-particle hematite powder screened are passed through the connecting pipe (22). The groove (15) enters the receiving box (3). Since the bottom of the inner cavity of the receiving box (3) is inclined, the large-grained hematite powder and the medium-grained hematite powder in the receiving box (3) are guided into the conveying pipe (26), and enter the feeding box (4) through the conveying pipe (26). Then, the third motor (23) is started, and the third motor (23) drives the spiral feeding rod (24) to rotate. The spiral feeding rod (24) transports the large-grained hematite powder and the medium-grained hematite powder to the connecting pipe (25), and then the large-grained hematite powder and the medium-grained hematite powder are sent to the grinding box (2) through the connecting pipe (25) for secondary grinding, thereby reducing the material transfer time, improving the processing efficiency, and reducing the work intensity of the workers. When in use, by starting the first motor (10), the first motor (10) drives the two extrusion protrusions (12) to rotate through the rotating rod (11), so that the two extrusion protrusions (12) respectively reciprocate and squeeze the corresponding extrusion plates (13). Under the cooperation of the extrusion protrusions (12) reciprocating and squeezing the extrusion plates (13) and the spring (9), the extrusion plates (13) drive the sliding cylinder (7) to slide reciprocatingly on the limit rod (6). The reciprocating sliding of the sliding cylinder (7) drives the screen plate (8) to move up and down reciprocatingly, thereby increasing the amplitude, which is beneficial to improving the screening efficiency of the screen plate (8). Through the screening of the two screen plates (8), the fine-grained hematite powder falls to the bottom of the inner cavity of the screening box (1). Since the bottom of the inner cavity of the screening box (1) is inclined, the fine-grained hematite powder is guided, which is convenient for the fine-grained hematite powder to be discharged through the discharge pipe (14).

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