Device and method for preparing anthracite raw material in cement produced by brick kiln

Abstract

The invention relates to the technical field of anthracite preparation, in particular to a preparation device and method for anthracite raw materials in brick kiln production cement, the preparation device comprises a support, a screen box and a shell, the screen box and the shell are arranged on the two sides of the support respectively, a pre-screening assembly is arranged on the shell, and the pre-screening assembly comprises a pre-screening frame; the pre-screening frame is fixedly installed on the inner side of the pre-screening plate, a partition plate is fixedly installed on one side of the pre-screening frame, the pre-screening plate is fixedly installed on the upper surface of the pre-screening frame, a bottom plate is fixedly installed on the lower side of an inner cavity of the shell, and a first crushing part is arranged below one end of the pre-screening plate. According to the preparation device and method for producing the anthracite raw material in the cement in the brick kiln, through the pre-screening assembly, it can be avoided that coal with the too large size enters the screening stage, and the screening efficiency is affected, meanwhile, secondary crushing can be rapidly conducted on the coal with the too large size, and the preparation efficiency is improved; and the continuity and automation of the device can be improved in cooperation with the conveying assembly.

Description

Technical Field

[0001] The invention relates to the technical field of anthracite preparation, in particular to a device and method for preparing anthracite raw material for producing cement in a brick kiln. Background Art

[0002] Anthracite raw meal refers to the original anthracite coal that has not been processed. Anthracite raw meal needs to be crushed and screened during the preparation process. First, the raw coal is preliminarily selected to remove impurities and particles that do not meet the requirements. Then, the coal is crushed using equipment such as jaw crushers or impact crushers. The crushed coal needs to be screened through screening equipment to separate coal of different particle sizes to achieve the required particle size.

[0003] However, during the crushing process, some raw materials are not fully crushed, resulting in the raw material volume being too large. This part of the raw material that needs to be crushed again will be mixed into the screening components, increasing the screening load, clogging the screen plate, affecting the passage of fine coal through the screen slot, and reducing the screening efficiency. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a device and method for preparing anthracite raw meal in cement production in a brick kiln, which solves the problems raised in the above-mentioned background technology.

[0005] To achieve the above purpose, the present invention is implemented through the following technical solutions: A preparation device for anthracite raw material in cement production by a brick kiln, comprising a bracket, a screen box and a shell, wherein the screen box and the shell are respectively arranged on both sides of the bracket, and a pre-screen assembly is arranged on the shell, wherein the pre-screen assembly comprises a pre-screen frame, wherein the pre-screen frame is fixedly mounted on the inner side of a pre-screen plate, a partition is fixedly mounted on one side of the pre-screen frame, a pre-screen plate is fixedly mounted on the upper surface of the pre-screen frame, and a bottom plate is fixedly mounted on the lower side of the inner cavity of the shell;

[0006] A first crushing member is provided below one end of the pre-screening plate, and the first crushing member is fixedly mounted on one side of the pre-screening frame; a hydraulic cylinder is fixedly mounted on the surface of the shell, and a second crushing member is fixedly mounted on the output shaft of the hydraulic cylinder, and the pre-screening frames are in active contact with each other;

[0007] A conveying assembly is arranged on the support, and the conveying assembly is used to improve the preparation efficiency.

[0008] Optionally, the conveying assembly includes a servo motor fixedly mounted on the top of the bracket, a first sprocket roller is fixedly mounted on the output shaft of the servo motor, a conveyor belt is drivingly connected to the roller surface of the first sprocket roller, a conveyor groove is provided on the surface of the conveyor belt, a chain is drivingly connected to the sprocket of the first sprocket roller, a second sprocket roller is drivingly connected to the other side of the chain, and the conveyor belt is drivingly connected to the second sprocket roller;

[0009] The outer surface of the second sprocket roller is fixedly sleeved with the first rotating wheel, the outer surface of the first rotating wheel is transmission-connected with the first transmission belt, the side of the first transmission belt away from the first rotating wheel is transmission-connected with the second rotating wheel, a loading piece is fixedly installed in the middle of the second rotating wheel, the outer surface of the loading piece is fixedly connected with an elastic ball, and a first collection box is arranged below the elastic ball.

[0010] Optionally, a screening assembly is provided on the screen box, and the screening assembly includes a first screen plate, the first screen plate is located in the inner cavity of the screen box, rubber pads are fixedly installed on both sides of the first screen plate, and a side of the rubber pad away from the first screen plate is fixedly connected to the inner cavity wall of the screen box;

[0011] A second sieve plate is fixedly installed in the inner cavity of the sieve box, and the second sieve plate is located below the first sieve plate. First through slots are provided on both the upper and lower sides of one side of the sieve box, and a second collecting box is provided below the first through slot.

[0012] A second through slot is provided at the bottom of the screen box, a third collecting box is arranged below the second through slot, a third rotating wheel is fixedly sleeved on the outer surface of the first sprocket roller, a second transmission belt is transmission-connected to the outer surface of the third rotating wheel, a side of the second transmission belt away from the third rotating wheel is transmission-connected to the fourth rotating wheel, and an eccentric roller is fixedly installed in the middle of the fourth rotating wheel.

[0013] Optionally, a blocking assembly is provided on the first sieve plate, and the blocking assembly includes a dispersion plate, the number of the dispersion plates is two, and both are hinged to the bottom of the first sieve plate, and blocking columns are fixedly installed on the upper and lower surfaces of the dispersion plates;

[0014] A leakage groove is opened in the middle of the dispersion plate, a sliding block is hingedly connected to the side of the blocking column away from the first screen plate, a sliding rail is movably installed on the outer surface of the sliding block, and the sliding rail is fixedly installed on the surface of the second screen plate.

[0015] Optionally, there is a gap between the bottom of the pre-screen frame and the upper surface of the bottom plate, and the bottom plate is installed inclined downward toward the screen box.

[0016] Optionally, the shape of the slider is T-shaped, the sieve slot width of the first sieve plate is greater than that of the second sieve plate, the diameter of the upper blocking column is adapted to the sieve slot width of the first sieve plate, and the diameter of the lower blocking column is adapted to the sieve slot width of the second sieve plate.

[0017] Optionally, the first crushing member and the second crushing member are both serrated and arranged alternately with each other, and a notch matched with the screen slot of the pre-screen plate is formed on one side of the pre-screen frame close to the second crushing member.

[0018] A method for preparing anthracite raw meal in cement produced by a brick kiln, using the above-mentioned device for preparing anthracite raw meal in cement produced by a brick kiln, comprises the following steps:

[0019] S1: First, the crushed coal is introduced into the shell and pre-screened by the pre-screening plate and the pre-screening frame, and the coal that does not meet the volume requirements will be crushed again by the first crushing part and the second crushing part, and the crushed coal and the coal that meets the volume requirements will be exported from the bottom plate;

[0020] S2: The coal that falls onto the bottom plate surface will be guided into the conveying trough by the elastic ball, and then transported to the inner cavity of the screen box by the conveyor belt for screening, so that coal of different volumes can be separated;

[0021] S3: When the first sieve plate is screening, it will drive the dispersion plate to move up and down, so that the blocking columns can block the sieve slots of the first sieve plate and the second sieve plate.

[0022] The present invention provides a device and method for preparing anthracite raw meal in cement production by a brick kiln, which has the following beneficial effects:

[0023] 1. The device and method for preparing anthracite raw material for producing cement in the brick kiln can prevent the presence of coal with too large volume from entering the screening stage and affecting the screening efficiency through the pre-screening component. At the same time, the coal with too large volume can be quickly crushed for the second time to improve the preparation efficiency. The continuity and automation of the device can be improved by cooperating with the conveying component.

[0024] 2. The device and method for preparing anthracite raw material for producing cement in the brick kiln can specifically screen the coal through the cooperation of the screening component and the unblocking component. At the same time, the first sieve plate and the second sieve plate are unblocked during the screening process to avoid blockage of the sieve slot, thereby further improving the preparation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The structure of the present invention is shown in FIG. Figure 1 ;

[0026] Figure 2 The structure of the present invention is shown in FIG. Figure 2 ;

[0027] Figure 3 The structure of the present invention is shown in FIG. Figure 3 ;

[0028] Figure 4 It is a structural schematic diagram of the pre-screening assembly of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the first crushing member of the present invention;

[0030] Figure 6 It is a schematic diagram of the structure inside the screen box of the present invention;

[0031] Figure 7 It is a schematic structural diagram of the dispersion plate of the present invention.

[0032] In the figure: 1. bracket; 11. screen box; 12. shell; 2. pre-screen plate; 21. partition; 22. bottom plate; 23. first crushing part; 24. hydraulic cylinder; 25. second crushing part; 26. pre-screen frame; 3. servo motor; 31. first sprocket roller; 32. conveyor belt; 33. conveyor trough; 34. chain; 35. second sprocket roller; 36. first rotating wheel; 37. first transmission belt; 38. second rotating wheel; 39. feeding part; 310. elastic ball; 311. first collecting box; 4. first screen plate; 41. second screen plate; 42. rubber pad; 43. first through groove; 44. second collecting box; 45. second through groove; 46. third collecting box; 47. third rotating wheel; 48. second transmission belt; 49. fourth rotating wheel; 410. eccentric roller; 5. dispersion plate; 51. blocking column; 52. slider; 53. slide rail. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] Example 1: Please refer to Figures 1 to 5 The present invention provides a technical solution: a preparation device for anthracite raw material in cement production by a brick kiln, comprising a support 1, a screen box 11 and a shell 12, wherein the screen box 11 and the shell 12 are respectively arranged on both sides of the support 1, and a pre-screen assembly is arranged on the shell 12, and the pre-screen assembly comprises a pre-screen frame 26, and the pre-screen frame 26 is fixedly installed on the inner side of the pre-screen plate 2, a partition plate 21 is fixedly installed on one side of the pre-screen frame 26, and the pre-screen plate 2 is fixedly installed on the upper surface of the pre-screen frame 26, and a bottom plate 22 is fixedly installed on the lower side of the inner cavity of the shell 12;

[0035] A first crushing member 23 is provided below one end of the pre-screening plate 2, and the first crushing member 23 is fixedly mounted on one side of the pre-screening frame 26. A hydraulic cylinder 24 is fixedly mounted on the surface of the housing 12, and a second crushing member 25 is fixedly mounted on the output shaft of the hydraulic cylinder 24. The pre-screening frames 26 are in movable contact with each other.

[0036] The first crushing piece 23 and the second crushing piece 25 are both serrated and staggered. A notch matching the screening slot of the pre-screening plate 2 is provided on one side of the pre-screening frame 26 close to the second crushing piece 25.

[0037] There is a gap between the bottom of the pre-screen frame 26 and the upper surface of the bottom plate 22, and the bottom plate 22 is installed in an inclined downward direction toward the screen box 11;

[0038] A conveying assembly is provided on the bracket 1, and the conveying assembly is used to improve the preparation efficiency.

[0039] Specifically, when in use, the user first needs to introduce the crushed coal into the housing 12 so that it is on the surface of the pre-screening plate 2. The pre-screening plate 2 can be used to pre-screen the coal, and the coal with a qualified volume will pass through the pre-screening plate 2 and the pre-screening frame 26 and fall to the upper surface of the bottom plate 22;

[0040] The coal with unqualified volume will move between the first crushing member 23 and the second crushing member 25. By starting the hydraulic cylinder 24, the second crushing member 25 can be driven to move, so that the second crushing member 25 and the first crushing member 23 cooperate with each other to crush the coal. After crushing, the coal with qualified volume will fall into the upper surface of the bottom plate 22 through the notch below the second crushing member 25, and the bottom plate 22 can be used to transport the coal to the feeding member 39.

[0041] In this way, it can be avoided that coal with too large volume enters the screening stage and affects the screening efficiency.

[0042] Example 2: Please refer to Figures 1 to 3 The conveying assembly includes a servo motor 3 fixedly mounted on the top of the bracket 1, a first sprocket roller 31 is fixedly mounted on the output shaft of the servo motor 3, a conveyor belt 32 is drivingly connected to the roller surface of the first sprocket roller 31, a conveying groove 33 is provided on the surface of the conveyor belt 32, a chain 34 is drivingly connected to the sprocket of the first sprocket roller 31, a second sprocket roller 35 is drivingly connected to the other side of the chain 34, and the conveyor belt 32 is drivingly connected to the second sprocket roller 35;

[0043] The outer surface of the second sprocket roller 35 is fixedly sleeved with the first rotating wheel 36, the outer surface of the first rotating wheel 36 is transmission-connected with the first transmission belt 37, the side of the first transmission belt 37 away from the first rotating wheel 36 is transmission-connected with the second rotating wheel 38, a loading piece 39 is fixedly installed in the middle of the second rotating wheel 38, the outer surface of the loading piece 39 is fixedly connected with an elastic ball 310, and a first collecting box 311 is arranged below the elastic ball 310.

[0044] On the basis of Example 1, when the coal is introduced to the feeding piece 39, the servo motor 3 is started to drive the first sprocket roller 31 to rotate, so that the first sprocket roller 31 drives the chain 34, so that the chain 34 drives the second sprocket roller 35 to rotate, and the second sprocket roller 35 can be used to drive the conveyor belt 32;

[0045] When the second sprocket roller 35 rotates, it drives the first rotating wheel 36 to rotate. The first rotating wheel 36 can drive the first transmission belt 37, so that the first transmission belt 37 drives the second rotating wheel 38 to rotate, and then the loading piece 39 rotates. The loading piece 39 can be used to guide the coal falling from the surface of the bottom plate 22 into the conveying trough 33, and is conveyed by the conveyor belt 32 to the inner cavity of the screen box 11 for screening, thereby improving the continuity and automation of the preparation operation;

[0046] When the loading piece 39 rotates, the elastic ball 310 will be stretched under the action of centrifugal force, causing the elastic ball 310 to touch the bottom plate 22, thereby causing the shell 12 to vibrate, thereby increasing the movement speed of the coal, reducing the probability of coal blockage, and preventing fine coal from adhering to the surface of the shell 12.

[0047] Example 3: Please refer to Figure 1 and Figure 7 A screening assembly is provided on the screen box 11, and the screening assembly includes a first screen plate 4, the first screen plate 4 is in the inner cavity of the screen box 11, and rubber pads 42 are fixedly installed on both sides of the first screen plate 4, and the side of the rubber pad 42 away from the first screen plate 4 is fixedly connected to the inner cavity wall of the screen box 11;

[0048] A second sieve plate 41 is fixedly installed in the inner cavity of the sieve box 11, and the second sieve plate 41 is located below the first sieve plate 4. First through slots 43 are provided on both the upper and lower sides of one side of the sieve box 11, and a second collecting box 44 is provided below the first through slot 43;

[0049] A second through slot 45 is provided at the bottom of the screen box 11, a third collecting box 46 is provided below the second through slot 45, a third rotating wheel 47 is fixedly sleeved on the outer surface of the first sprocket roller 31, a second transmission belt 48 is transmission-connected to the outer surface of the third rotating wheel 47, a fourth rotating wheel 49 is transmission-connected to the side of the second transmission belt 48 away from the third rotating wheel 47, an eccentric roller 410 is fixedly installed in the middle of the fourth rotating wheel 49;

[0050] The first sieve plate 4 is provided with a blocking assembly, which includes a dispersion plate 5. There are two dispersion plates 5, both of which are hinged to the bottom of the first sieve plate 4. Blocking columns 51 are fixedly installed on the upper and lower surfaces of the dispersion plates 5.

[0051] A leakage groove is provided in the middle of the dispersion plate 5, and a slider 52 is hingedly connected to the side of the blocking column 51 away from the first sieve plate 4. A slide rail 53 is movably installed on the outer surface of the slider 52, and the slide rail 53 is fixedly installed on the surface of the second sieve plate 41;

[0052] The slider 52 is T-shaped, the sieve slot width of the first sieve plate 4 is greater than that of the second sieve plate 41 , the diameter of the upper blocking column 51 matches the sieve slot width of the first sieve plate 4 , and the diameter of the lower blocking column 51 matches the sieve slot width of the second sieve plate 41 .

[0053] On the basis of Example 2, when the conveyor belt 32 conveys the coal to the inner cavity of the screen box 11, the coal is on the upper surface of the first screen plate 4 at this time. When the first sprocket roller 31 is driven, the third rotating wheel 47 can be driven to rotate. The third rotating wheel 47 can drive the second transmission belt 48, so that the second transmission belt 48 drives the fourth rotating wheel 49 to rotate. The fourth rotating wheel 49 can drive the eccentric roller 410 to rotate, so that the eccentric roller 410 drives the first screen plate 4, so that the first screen plate 4 vibrates to achieve coal screening;

[0054] When the first sieve plate 4 is screening, the first sieve plate 4 will move up and down under the action of the rubber pad 42, so that the angles between the dispersion plate 5 and the first sieve plate 4, and between the dispersion plate 5 and the second sieve plate 41 become smaller, and at this time, the blocking column 51 will extend into the sieve slots of the first sieve plate 4 and the second sieve plate 41, and then the first sieve plate 4 and the second sieve plate 41 will be blocked, so as to avoid coal being stuck in the sieve slots and affecting the screening efficiency of the first sieve plate 4 and the second sieve plate 41;

[0055] After screening, the coal will be divided into three different volumes and collected in two second collection boxes 44 and a third collection box 46 respectively, so as to achieve specific screening of the coal.

[0056] A method for preparing anthracite raw meal in cement produced by a brick kiln, using the above-mentioned device for preparing anthracite raw meal in cement produced by a brick kiln, comprises the following steps:

[0057] S1: First, the crushed coal is introduced into the shell 12, and pre-screened by the pre-screening plate 2 and the pre-screening frame 26, and the coal with unqualified volume is crushed again by the first crushing member 23 and the second crushing member 25, and the crushed coal and the coal with qualified volume are discharged from the bottom plate 22;

[0058] S2: The coal falling onto the surface of the bottom plate 22 is guided into the conveying trough 33 by the elastic ball 310, and then conveyed to the inner cavity of the screen box 11 by the conveyor belt 32 for screening, so that coal of different volumes is separated;

[0059] S3: When the first sieve plate 4 is screening, it will drive the dispersion plate 5 to move up and down, so that the blocking columns 51 block the sieve slots of the first sieve plate 4 and the second sieve plate 41 .

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated 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 that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for preparing anthracite raw meal for producing cement in a brick kiln, comprising a support (1), a screen box (11) and a shell (12), wherein the screen box (11) and the shell (12) are respectively arranged on both sides of the support (1), characterized in that: The housing (12) is provided with a pre-screening assembly, the pre-screening assembly comprising a pre-screening frame (26), the pre-screening frame (26) being fixedly mounted on the inner side of the pre-screening plate (2), a partition plate (21) being fixedly mounted on one side of the pre-screening frame (26), the pre-screening plate (2) being fixedly mounted on the upper surface of the pre-screening frame (26), and a bottom plate (22) being fixedly mounted on the lower side of the inner cavity of the housing (12); A first crushing member (23) is provided below one end of the pre-screening plate (2), and the first crushing member (23) is fixedly mounted on one side of the pre-screening frame (26); a hydraulic cylinder (24) is fixedly mounted on the surface of the housing (12), a second crushing member (25) is fixedly mounted on the output shaft of the hydraulic cylinder (24), and the pre-screening frame (26) is in movable contact with the pre-screening frame (26); The support (1) is provided with a conveying component, and the conveying component is used to improve the preparation efficiency.

2. The device for preparing anthracite raw meal in cement production by a brick kiln according to claim 1, characterized in that: The conveying assembly comprises a servo motor (3) fixedly mounted on the top of the bracket (1); a first sprocket roller (31) is fixedly mounted on the output shaft of the servo motor (3); a conveyor belt (32) is drivingly connected to the roller surface of the first sprocket roller (31); a conveying groove (33) is provided on the surface of the conveyor belt (32); a chain (34) is drivingly connected to the sprocket of the first sprocket roller (31); a second sprocket roller (35) is drivingly connected to the other side of the chain (34); and the conveyor belt (32) is drivingly connected to the second sprocket roller (35); The outer surface of the second sprocket roller (35) is fixedly sleeved with a first rotating wheel (36), the outer surface of the first rotating wheel (36) is drivingly connected to a first transmission belt (37), the first transmission belt (37) is drivingly connected to a second rotating wheel (38) at a side away from the first rotating wheel (36), a loading piece (39) is fixedly installed in the middle of the second rotating wheel (38), the outer surface of the loading piece (39) is fixedly connected to an elastic ball (310), and a first collection box (311) is arranged below the elastic ball (310).

3. The device for preparing anthracite raw meal in cement production by a brick kiln according to claim 2, characterized in that: The screen box (11) is provided with a screening assembly, the screening assembly comprising a first screen plate (4), the first screen plate (4) being located in the inner cavity of the screen box (11), rubber pads (42) being fixedly mounted on both sides of the first screen plate (4), and a side of the rubber pad (42) away from the first screen plate (4) being fixedly connected to the inner cavity wall of the screen box (11); A second sieve plate (41) is fixedly mounted in the inner cavity of the sieve box (11), the second sieve plate (41) is located below the first sieve plate (4), first through slots (43) are provided on both the upper and lower sides of one side of the sieve box (11), and a second collecting box (44) is provided below the first through slot (43); A second through slot (45) is provided at the bottom of the screen box (11), a third collecting box (46) is provided below the second through slot (45), a third rotating wheel (47) is fixedly sleeved on the outer surface of the first sprocket roller (31), a second transmission belt (48) is transmission-connected to the outer surface of the third rotating wheel (47), a side of the second transmission belt (48) away from the third rotating wheel (47) is transmission-connected to a fourth rotating wheel (49), and an eccentric roller (410) is fixedly installed in the middle of the fourth rotating wheel (49).

4. The device for preparing anthracite raw meal in cement production by a brick kiln according to claim 3, characterized in that: The first sieve plate (4) is provided with a blocking assembly, the blocking assembly comprising a dispersion plate (5), the dispersion plates (5) being two in number and both hinged to the bottom of the first sieve plate (4), and blocking columns (51) being fixedly mounted on the upper and lower surfaces of the dispersion plates (5); A leakage groove is provided in the middle of the dispersion plate (5), and a sliding block (52) is hingedly connected to the side of the blocking column (51) away from the first sieve plate (4). A sliding rail (53) is movably mounted on the outer surface of the sliding block (52), and the sliding rail (53) is fixedly mounted on the surface of the second sieve plate (41).

5. The device for preparing anthracite raw meal for producing cement in a brick kiln according to claim 4, characterized in that: There is a gap between the bottom of the pre-screen frame (26) and the upper surface of the bottom plate (22), and the bottom plate (22) is installed in an inclined downward direction toward the screen box (11).

6. The device for preparing anthracite raw meal for producing cement in a brick kiln according to claim 5, characterized in that: The shape of the sliding block (52) is T-shaped, the width of the sieve slot of the first sieve plate (4) is greater than the width of the sieve slot of the second sieve plate (41), the diameter of the upper blocking column (51) is adapted to the width of the sieve slot of the first sieve plate (4), and the diameter of the lower blocking column (51) is adapted to the width of the sieve slot of the second sieve plate (41).

7. The device for preparing anthracite raw meal for producing cement in a brick kiln according to claim 6, characterized in that: The first crushing piece (23) and the second crushing piece (25) are both serrated and arranged alternately with each other. A notch matching the screening slot of the pre-screening plate (2) is provided on one side of the pre-screening frame (26) close to the second crushing piece (25).

8. A method for preparing anthracite raw meal for cement produced in a brick kiln, using the device for preparing anthracite raw meal for cement produced in a brick kiln as described above, characterized in that: The following steps are involved: S1: First, the crushed coal is introduced into the housing (12) and pre-screened by the pre-screening plate (2) and the pre-screening frame (26), and the coal that does not meet the volume requirements is crushed again by the first crushing member (23) and the second crushing member (25), and the crushed coal and the coal that meets the volume requirements are discharged by the bottom plate (22); S2: The coal that falls onto the surface of the bottom plate (22) is guided into the conveying trough (33) by the elastic ball (310), and then conveyed to the inner cavity of the screen box (11) by the conveyor belt (32) for screening, so that coal of different volumes is separated; S3: When the first sieve plate (4) performs screening, it drives the dispersion plate (5) to move up and down, thereby causing the blocking column (51) to block the sieve slots of the first sieve plate (4) and the second sieve plate (41).

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