Flour screening machine and flour making method

Abstract

The invention provides a flour screening machine and a flour making method, and belongs to the field of flour making. Comprising a round shell and side shells, the side shells are fixedly installed on the front side and the rear side of the round shell, a round plate is movably connected to the top face of the round shell, a plurality of feeding assemblies are arranged on the top face of the round plate, a vertical pipe is fixedly connected to the center of the bottom face of the round plate, and the vertical pipe is provided with a plurality of through grooves and sleeved with a plurality of installation rings; a screen is fixedly connected to the outer wall of the mounting ring, a mounting assembly is arranged on the bottom face of the mounting ring, an annular plate is fixedly connected to the side, away from the mounting ring, of the screen, and a plurality of arc-shaped grooves are evenly formed in the bottom face of the annular plate. Through the arrangement of the detachable side shell, the structure in the round shell can be conveniently maintained, and through clamping connection between an insertion plate on the mounting assembly and a through groove in the vertical pipe, the screen can be conveniently mounted, so that subsequent maintenance or replacement operation on the screen is facilitated, and the use effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of flour production, in particular to a flour screening machine and a flour production method. Background Art

[0002] In the flour processing industry, flour quality is directly related to the quality and safety of downstream food processing products. Flour screening, a core process in flour processing, separates flour particles of varying sizes and removes impurities, enabling precise control of flour particle size distribution and reducing ash content, thereby ensuring the stability and uniformity of flour quality.

[0003] Currently, most common flour sieving machines use a fixed screen coupled with a simple vibration method to sieve the flour through the screen. However, this traditional sieving method has many problems. First, the fixed screen and single motion method make it difficult to fully disperse the flour, resulting in flour accumulation on the screen, low screening efficiency, and reduced flour production efficiency. Second, after long-term use, the screen is prone to clogging and wear due to flour particles, requiring replacement. However, the screen structure of existing sieving machines is compact, and the replacement process is complex, which not only consumes a lot of time and manpower, but also affects the normal operation of the equipment.

[0004] Based on the above reasons, the present invention proposes a flour screening machine and a flour production method, which can achieve efficient screening of flour and facilitate maintenance operations on the screening machine. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a flour screening machine and a flour making method which have the advantages of high-efficiency screening and convenient maintenance.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A flour screening machine comprises a circular shell, side shells are fixedly installed on the front and rear sides of the circular shell and a circular plate is movably connected to the top surface, a multi-way feeding assembly is provided on the top surface of the circular plate and a vertical pipe is fixedly connected to the center of the bottom surface, a plurality of through slots are provided on the vertical pipe and a plurality of mounting rings are sleeved on the vertical pipe, a screen is fixedly connected to the outer wall of the mounting ring and a mounting assembly is provided on the bottom surface, the screen is fixedly connected to an annular plate on the side away from the mounting ring, a plurality of arc grooves are evenly distributed on the bottom surface of the annular plate, a plurality of fixing rods matching the arc grooves are fixedly connected to the inner walls of the two side shells, a discharge shell is fixedly connected to the bottom surface of the side shell, and a rotary drive assembly is provided on the outer wall of the circular shell.

[0008] Preferably, the multi-channel feeding assembly includes a top shell, and a plurality of conduits are evenly distributed and fixedly connected to the bottom surface of the top shell. The end of the conduit away from the top shell passes through the circular plate and is fixedly connected to the circular plate. A conical shell is fixedly connected to the center of the inner cavity of the top shell.

[0009] Preferably, the mounting assembly includes a fixing plate, which is fixedly connected to the bottom surface of the mounting ring and has an insert plate movably connected to the side wall. The insert plate is L-shaped and one side is inserted into the through groove. A round rod movably connected to the insert plate is fixedly connected to the side wall of the fixing plate.

[0010] Preferably, one end of the round rod is fixedly connected to a flat plate and a spring is sleeved on the side wall, and both ends of the spring are fixedly connected to the flat plate and the plug plate respectively.

[0011] Preferably, the rotary drive assembly includes a motor, which is fixedly connected to the circular shell and has a main shaft fixedly connected to the rotor. The top of the main shaft is fixedly connected to a first gear, and the side wall of the circular plate is fixedly connected to a ring gear meshing with the first gear.

[0012] Preferably, a side plate is fixedly connected to the side wall of the circular shell close to the side shell, and side plates are fixedly connected to both sides of the side shell. The same bolt passes through the side plate on the same side, and a nut is threadedly connected to one end of the bolt.

[0013] Preferably, the top surface of the discharge shell is semicircular with a semicircular groove at the center. The diameter of the discharge shell is the same as the outer diameter of the circular shell. The semicircular groove is concentric with the vertical pipe and has the same diameter.

[0014] Preferably, the outer side wall of the vertical tube is arranged in a regular hexagonal shape, the inner wall of the mounting ring is arranged to match the vertical tube and the outer wall is arranged in a circular shape.

[0015] Preferably, two support plates are symmetrically fixedly connected to the outer side wall of the circular shell, and the bottom surfaces of the two support plates are fixedly connected to the same support base.

[0016] A flour production method for a flour screening machine comprises the following steps:

[0017] S1: Start the motor, the motor drives the main shaft to rotate, the main shaft drives the first gear to mesh with the ring gear to rotate, the ring gear drives the circular plate to rotate, and at the same time, the flour to be screened is added to the top shell through external equipment. Under the action of the gravity of the flour and the conical shell, the flour can enter each tube, and the flour in the tube enters the inner cavity of the circular shell. The rotation of the tube driven by the circular plate can further disperse the flour into the inner cavity of the circular shell, which can effectively improve the uniformity of flour screening and filling;

[0018] S2: The flour entering the inner cavity of the circular shell contacts the screen and is screened layer by layer. At the same time, the vertical tube is driven to rotate by the circular plate, and the vertical tube drives the screen to rotate together through the mounting ring. The rotation of the screen can achieve efficient screening of the flour, and the screen drives the annular plate to rotate. Because the bottom surface of the annular plate and the fixed rod are in contact with each other under the action of gravity, when the fixed rod moves into the arc groove, the annular plate drives the screen to move up and down, which can achieve further efficient screening of the flour on the screen.

[0019] S3: After the flour is sifted through layers of screens, qualified flour will enter the discharge shell and be discharged out of the equipment through the discharge shell, while the impurities or larger particles inside the flour will be blocked by the screens layer by layer. Because the screens are tilted, the impurity particles can pass through the through slots into the inner cavity of the vertical tube, and under the action of gravity, the impurity particles are discharged from the vertical tube through the semicircular grooves, completing the impurity removal operation, stopping the rotation of the motor, and completing the flour screening operation;

[0020] S4: When the screen is damaged or needs to be replaced with a specified size screen according to actual needs, the operator removes the bolts and nuts on both sides to remove the front and rear side shells from the round shell;

[0021] S5: Remove the mounting ring from bottom to top along the vertical pipe. Pull the plug plate, which compresses the spring and pulls one side out of the slot. This releases the lock between the mounting ring and the vertical pipe, and pushes the screen downward. When the mounting ring is separated from the vertical pipe, the screen is removed. This way, all screens can be removed.

[0022] S6: After the replacement or maintenance of the screen is completed, the screens are installed on the vertical pipes in the specified order. Pull the plug plate and put the installation ring on the vertical pipe, push the screen upward along the vertical pipe. When the screen moves to the slot position at the specified height, release the plug plate. The plug plate is inserted into the slot under the push of the spring to complete the installation of the screen. In this way, the installation of all screens is completed.

[0023] S7: Place the side shells on both sides to the front and rear sides of the round shell, insert the bolts into the holes on the side plates, and tighten the nuts on the bolts to lock the side plates. The side shells can be fixed to the round shell, completing the maintenance operation of this screening machine.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] The present invention can realize the feeding operation of flour at multiple positions by setting multiple conduits, and the rotation of the conduits driven by the circular plate can further disperse the flour into the circular shell, which can effectively improve the uniformity of flour screening and filling, thereby improving the efficiency of flour screening;

[0026] The present invention drives the screen to rotate by the vertical tube, thereby realizing the rotational screening operation of flour, and realizes the up and down movement of the screen by the fixed rod moving in the annular plate and the arc groove. The combined effect of multiple screens can further improve the screening efficiency of flour.

[0027] The present invention can conveniently perform maintenance operations on the structure inside the circular shell through the setting of the detachable side shell, and can realize convenient installation of the screen through the clamping connection between the plug plate on the installation component and the through groove on the vertical pipe, thereby facilitating subsequent maintenance or replacement operations of the screen, and has good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable one skilled in the relevant art to make and use the present disclosure.

[0029] Figure 1 It is a schematic diagram of the front three-dimensional structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the side three-dimensional structure of the present invention;

[0031] Figure 3 It is a schematic diagram of the transverse cross-sectional three-dimensional structure of the present invention;

[0032] Figure 4 It is a schematic diagram of the three-dimensional structure on the circular plate of the present invention;

[0033] Figure 5 This is a schematic diagram of the three-dimensional structure of the interior of the circular shell of the present invention at one angle;

[0034] Figure 6 This is a schematic diagram of the three-dimensional structure of the interior of the circular shell of the present invention from another angle;

[0035] Figure 7 It is a schematic diagram of the three-dimensional structure of the mounting ring of the present invention;

[0036] Figure 8 It is a schematic diagram of the three-dimensional structure of the circular shell of the present invention;

[0037] Figure 9 It is a schematic diagram of the three-dimensional structure of the side shell of the present invention.

[0038] [reference numerals]

[0039] 1. Round shell; 2. Side shell; 3. Round plate; 4. Multi-way feed assembly; 5. Vertical pipe; 6. Through groove; 7. Mounting ring; 8. Screen; 9. Mounting assembly; 10. Ring plate; 11. Arc groove; 12. Fixed rod; 13. Discharge shell; 14. Rotary drive assembly; 15. Top shell; 16. Cone; 17. Conical shell; 18. Fixed plate; 19. Insert plate; 20. Round rod; 21. Flat plate; 22. Spring; 23. Motor; 24. Main shaft; 25. First gear; 26. Ring gear; 27. Side plate; 28. Bolt; 29. Nut; 30. Semicircular groove; 31. Support plate; 32. Support seat.

[0040] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the appended claims. DETAILED DESCRIPTION

[0041] The following describes in detail a flour sieving machine and a flour production method provided by the present invention, with reference to the accompanying drawings and specific embodiments. It is also noted that, to provide a more detailed description, the following embodiments are best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement the invention with respect to known technologies. Furthermore, the accompanying drawings are only for the purpose of describing the embodiments in more detail and are not intended to limit the present invention in any specific manner.

[0042] like Figure 1-9 As shown, an embodiment of the present invention provides a flour screening machine, including a circular shell 1, side shells 2 are fixedly mounted on both the front and rear sides of the circular shell 1, and a circular plate 3 is movably connected to the top surface. A side plate 27 is fixedly connected to the side wall of the circular shell 1 close to the side shell 2, and both sides of the side shell 2 are fixedly connected to the side plates 27. A bolt 28 passes through the side plate 27 on the same side, and a nut 29 is threadedly connected to one end of the bolt 28.

[0043] In this embodiment, the bolts 28 penetrate the side plates 27, and by tightening the nuts 29 and bolts 28, the side plates 27 on the same side can be locked, completing the fixed installation of the side shell 2 on the circular shell 1, which facilitates the maintenance and operation of the interior.

[0044] Two support plates 31 are symmetrically fixedly connected to the outer wall of the circular shell 1, and the bottom surfaces of the two support plates 31 are fixedly connected to the same support base 32, which can achieve stable support for the screening machine and facilitate screening processing;

[0045] A multi-channel feed assembly 4 is provided on the top surface of the circular plate 3, and a vertical pipe 5 is fixedly connected to the center of the bottom surface. The multi-channel feed assembly 4 includes a top shell 15, and a plurality of conduits 16 are evenly distributed and fixedly connected to the bottom surface of the top shell 15. The end of the conduit 16 away from the top shell 15 passes through the circular plate 3 and is fixedly connected to the circular plate 3. A conical shell 17 is fixedly connected to the center of the inner cavity of the top shell 15.

[0046] In this embodiment, flour to be sifted is added to the top shell 15 through an external device. Under the action of the gravity of the flour and the conical shell 17, the flour can enter each conduit 16. The flour in the conduit 16 enters the inner cavity of the circular shell 1, which can effectively improve the uniformity of flour sifting and filling.

[0047] The vertical tube 5 is provided with a plurality of through slots 6 and is sleeved with a plurality of mounting rings 7. The outer wall of the vertical tube 5 is set in a regular hexagonal shape. The inner wall of the mounting ring 7 is matched with the vertical tube 5 and the outer wall is set in a circular shape.

[0048] In this embodiment, the sleeve installation between the mounting ring 7 and the vertical pipe 5 can be facilitated, and the idling of the mounting ring 7 on the vertical pipe 5 during the rotation process can be avoided, thereby ensuring the stable rotation of the screen 8 and improving the screening effect;

[0049] A screen 8 is fixedly connected to the outer wall of the mounting ring 7 and a mounting assembly 9 is provided on the bottom surface. The mounting assembly 9 includes a fixing plate 18, which is fixedly connected to the bottom surface of the mounting ring 7 and is movably connected to a plug plate 19 on the side wall. The plug plate 19 is L-shaped and one side is inserted into the through groove 6. A round rod 20 movably connected to the plug plate 19 is fixedly connected to the side wall of the fixing plate 18. A flat plate 21 is fixedly connected to one end of the round rod 20 and a spring 22 is sleeved on the side wall. The two ends of the spring 22 are respectively fixedly connected to the flat plate 21 and the plug plate 19;

[0050] In this embodiment, when the mounting ring 7 moves to the designated position on the vertical tube 5, the spring 22 can cause the insert plate 19 to be inserted into the through groove 6 on the side wall of the vertical tube 5. By using the snap connection between the insert plate 19 and the through groove 6, the screen 8 can be conveniently installed in the designated position, which is not only convenient for screening but also convenient for subsequent maintenance operations.

[0051] The screen 8 is fixedly connected to the side away from the mounting ring 7 with an annular plate 10, and a plurality of arc-shaped grooves 11 are evenly distributed on the bottom surface of the annular plate 10. A plurality of fixing rods 12 matching the arc-shaped grooves 11 are fixedly connected to the inner walls of the two side shells 2;

[0052] In this embodiment, because the bottom surface of the annular plate 10 and the fixed rod 12 are in contact with each other under the action of gravity, when the fixed rod 12 moves into the arc-shaped groove 11, the annular plate 10 drives the screen 8 to move up and down, thereby achieving further efficient screening of the flour on the screen 8;

[0053] A discharge shell 13 is fixedly connected to the bottom surface of the side shell 2. The top surface of the discharge shell 13 is semicircular and a semicircular groove 30 is opened at the center. The diameter of the discharge shell 13 is the same as the outer diameter of the circular shell 1. The semicircular groove 30 is concentric with the vertical pipe 5 and has the same diameter.

[0054] In this embodiment, after the flour is sieved through the layers of screens 8, qualified flour enters the discharge housing 13 and is discharged outside the device through the discharge housing 13, while impurities or larger particles inside the flour are blocked by the screens 8 layer by layer. Because the screens 8 are tilted, the impurity particles can pass through the through grooves 6 and enter the inner cavity of the vertical tube 5. Under the action of gravity, the impurity particles are discharged from the vertical tube 5 through the semicircular grooves 30, completing the impurity removal operation.

[0055] A rotary drive assembly 14 is provided on the outer wall of the circular shell 1. The rotary drive assembly 14 includes a motor 23. The motor 23 is fixedly connected to the circular shell 1 and a main shaft 24 is fixedly connected to the rotor. A first gear 25 is fixedly connected to the top of the main shaft 24. A ring gear 26 meshing with the first gear 25 is fixedly connected to the side wall of the circular plate 3.

[0056] In this embodiment, the motor 23 is started, the motor 23 drives the main shaft 24 to rotate, the main shaft 24 drives the first gear 25 to engage the ring gear 26 to rotate, and the ring gear 26 drives the circular plate 3 to rotate. The rotation of the circular plate 3 can realize the driving operation of feeding and screening.

[0057] A flour production method for a flour screening machine, characterized by comprising the following steps:

[0058] S1: Start the motor 23, which drives the main shaft 24 to rotate. The main shaft 24 drives the first gear 25 to engage the ring gear 26 to rotate. The ring gear 26 drives the circular plate 3 to rotate. At the same time, the flour to be screened is added to the top shell 15 through an external device. Under the action of the gravity of the flour and the conical shell 17, the flour can enter the various conduits 16. The flour in the conduits 16 enters the inner cavity of the circular shell 1. The rotation of the conduits 16 driven by the circular plate 3 can further disperse the flour into the inner cavity of the circular shell 1, which can effectively improve the uniformity of flour screening and filling.

[0059] S2: The flour entering the inner cavity of the circular shell 1 contacts the screen 8 and is screened layer by layer through the screen 8. At the same time, the vertical tube 5 is driven to rotate by the circular plate 3, and the vertical tube 5 drives the screen 8 to rotate together through the mounting ring 7. The rotation of the screen 8 can achieve efficient screening of the flour, and the screen 8 drives the annular plate 10 to rotate. Because the bottom surface of the annular plate 10 and the fixed rod 12 are in contact with each other under the action of gravity, when the fixed rod 12 moves into the arc groove 11, the annular plate 10 drives the screen 8 to move up and down, which can achieve further efficient screening of the flour on the screen 8.

[0060] S3: After the flour is sifted through the layers of screens 8, qualified flour enters the discharge housing 13 and is discharged outside the device through the discharge housing 13, while impurities or larger particles inside the flour are blocked by the screens 8 layer by layer. Because the screens 8 are tilted, the impurity particles can pass through the through slots 6 and enter the inner cavity of the vertical tube 5. Under the action of gravity, the impurity particles are discharged from the vertical tube 5 through the semicircular grooves 30, completing the impurity removal operation. The motor 23 stops rotating, and the flour screening operation is completed.

[0061] S4: When the screen 8 is damaged or needs to be replaced with a screen 8 of a specified specification according to actual needs, the operator removes the bolts 28 and nuts 29 on both sides to remove the front and rear side shells 2 from the round shell 1;

[0062] S5: Remove the mounting ring 7 from the bottom up along the vertical tube 5. By pulling the insert plate 19, the insert plate 19 compresses the spring 22 and one side is pulled out from the through groove 6, thereby releasing the lock between the mounting ring 7 and the vertical tube 5 and pushing the screen 8 downward. When the mounting ring 7 is separated from the vertical tube 5, the removal operation of the screen 8 is completed. In this way, all screens 8 can be removed.

[0063] S6: After the replacement or maintenance of the screen 8 is completed, the screens 8 are installed on the vertical pipe 5 in the specified order, the insert plate 19 is pulled and the mounting ring 7 is set on the vertical pipe 5, and the screen 8 is pushed upward along the vertical pipe 5. When the screen 8 moves to the position of the through slot 6 at the specified height, the insert plate 19 is released. The insert plate 19 is inserted into the through slot 6 under the push of the spring 22, and the installation operation of the screen 8 is completed. In this way, the installation of all the screens 8 is completed;

[0064] S7: Place the side shells 2 on both sides to the front and rear sides of the circular shell 1, insert the bolts 28 into the holes on the side plates 27, and tighten the nuts 29 on the bolts 28 to lock the side plates 27. The side shells 2 can be fixed to the circular shell 1, and the maintenance operation of the screening machine is completed.

[0065] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A flour screening machine, comprising a round shell (1), characterized in that: The circular shell (1) is fixedly mounted with side shells (2) on both the front and rear sides and is movably connected with a circular plate (3) on the top surface; a multi-way feeding assembly (4) is arranged on the top surface of the circular plate (3) and a vertical pipe (5) is fixedly connected to the center of the bottom surface; a plurality of through grooves (6) are provided on the vertical pipe (5) and a plurality of mounting rings (7) are sleeved thereon; a screen (8) is fixedly connected to the outer wall of the mounting ring (7) and a mounting assembly (9) is arranged on the bottom surface; a ring plate (10) is fixedly connected to the side of the screen (8) away from the mounting ring (7); a plurality of arc grooves (11) are evenly distributed on the bottom surface of the ring plate (10); a plurality of fixing rods (12) matching the arc grooves (11) are fixedly connected to the inner walls of the two side shells (2); a discharge shell (13) is fixedly connected to the bottom surface of the side shell (2); and a rotary drive assembly (14) is arranged on the outer wall of the circular shell (1).

2. A flour screening machine according to claim 1, characterized in that, The multi-channel feeding assembly (4) comprises a top shell (15), a plurality of conduits (16) are evenly distributed and fixedly connected on the bottom surface of the top shell (15), the conduits (16) extending away from one end of the top shell (15) penetrate the circular plate (3) and are fixedly connected to the circular plate (3), and a conical shell (17) is fixedly connected at the center of the inner cavity of the top shell (15).

3. A flour screening machine according to claim 2, characterized in that, The mounting assembly (9) includes a fixed plate (18), the fixed plate (18) being fixedly connected to the bottom surface of the mounting ring (7) and having an inserting plate (19) movably connected to the side wall thereof, the inserting plate (19) being arranged in an L-shape and having one side inserted into the through groove (6), and a round rod (20) being fixedly connected to the side wall of the fixed plate (18) and movably connected to the inserting plate (19).

4. A flour screening machine according to claim 3, characterized in that, One end of the round rod (20) is fixedly connected to a flat plate (21) and a spring (22) is sleeved on the side wall. Both ends of the spring (22) are fixedly connected to the flat plate (21) and the plug plate (19) respectively.

5. A flour screening machine according to claim 4, characterized in that, The rotary drive assembly (14) includes a motor (23), the motor (23) is fixedly connected to the circular shell (1), and a main shaft (24) is fixedly connected to the rotor, a first gear (25) is fixedly connected to the top end of the main shaft (24), and a ring gear (26) meshing with the first gear (25) is fixedly connected to the side wall of the circular plate (3).

6. A flour screening machine according to claim 5, characterized in that, A side plate (27) is fixedly connected to the side wall of the circular shell (1) close to the side shell (2), and both sides of the side shell (2) are fixedly connected to the side plates (27). A bolt (28) passes through the side plate (27) on the same side, and a nut (29) is threadedly connected to one end of the bolt (28).

7. A flour screening machine according to claim 6, characterized in that: The top surface of the discharge shell (13) is semicircular and has a semicircular groove (30) at the center. The diameter of the discharge shell (13) is the same as the outer diameter of the circular shell (1). The semicircular groove (30) is concentric with the vertical pipe (5) and has the same diameter.

8. A flour screening machine according to claim 7, characterized in that: The outer side wall of the vertical tube (5) is arranged in a regular hexagonal shape, and the inner wall of the mounting ring (7) is arranged to match the vertical tube (5) and the outer wall is arranged in a circular shape.

9. A flour screening machine according to claim 8, characterized in that: Two support plates (31) are symmetrically fixedly connected to the outer side wall of the circular shell (1), and the bottom surfaces of the two support plates (31) are fixedly connected to the same support seat (32).

10. The flour production method of a flour screening machine according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Start the motor (23), the motor (23) drives the main shaft (24) to rotate, the main shaft (24) drives the first gear (25) to engage the ring gear (26) to rotate, the ring gear (26) drives the circular plate (3) to rotate, and at the same time, the flour to be screened is added to the top shell (15) through the external device, and under the action of the gravity of the flour and the conical shell (17), the flour can enter each conduit (16), and the flour in the conduit (16) enters the inner cavity of the circular shell (1), and the rotation of the conduit (16) driven by the circular plate (3) can make the flour further dispersed into the inner cavity of the circular shell (1), which can effectively improve the uniformity of flour screening and filling; S2: The flour entering the inner cavity of the circular shell (1) contacts the screen (8), and is screened layer by layer through the screen (8). At the same time, the vertical tube (5) is driven to rotate by the circular plate (3), and the vertical tube (5) drives the screen (8) to rotate together through the mounting ring (7). The rotation of the screen (8) can achieve efficient screening of the flour, and the screen (8) drives the annular plate (10) to rotate. Because the bottom surface of the annular plate (10) and the fixed rod (12) are in contact with each other under the action of gravity, when the fixed rod (12) moves into the arc groove (11), the annular plate (10) drives the screen (8) to move up and down, which can achieve further efficient screening of the flour on the screen (8); S3: After the flour is sieved through the layers of screens (8), the qualified flour will enter the inside of the discharge shell (13) and be discharged outside the equipment through the discharge shell (13), while the impurities or larger particles inside the flour will be blocked by the screens (8) layer by layer. Because the screens (8) are tilted, the impurity particles can enter the inner cavity of the vertical pipe (5) through the through groove (6) and be discharged from the vertical pipe (5) through the semicircular groove (30) under the action of gravity, completing the impurity removal operation, stopping the rotation of the motor (23), and completing the flour sieving operation; S4: When the screen (8) is damaged or needs to be replaced with a screen (8) of a specified specification according to actual needs, the operator removes the bolts (28) and nuts (29) on both sides, and the side shells (2) on the front and rear sides can be removed from the round shell (1); S5: The mounting ring (7) is dismantled from the bottom up along the vertical tube (5). By pulling the insert plate (19), the insert plate (19) compresses the spring (22) and one side is pulled out from the through groove (6), thereby releasing the lock between the mounting ring (7) and the vertical tube (5), and pushing the screen (8) downward. When the mounting ring (7) is separated from the vertical tube (5), the dismantling operation of the screen (8) is completed. In this way, the dismantling operation of all screens (8) can be achieved; S6: After the screen (8) is replaced or maintained, the screens (8) are installed on the vertical pipe (5) in the specified order, the insert plate (19) is pulled and the mounting ring (7) is set on the vertical pipe (5), and the screen (8) is pushed upward along the vertical pipe (5). When the screen (8) moves to the position of the through slot (6) at the specified height, the insert plate (19) is released. The insert plate (19) is inserted into the through slot (6) under the push of the spring (22), and the installation operation of the screen (8) is completed. In this way, the installation of all the screens (8) is completed; S7: Place the side shells (2) on both sides at the front and rear sides of the circular shell (1), insert the bolts (28) into the holes on the side plates (27), and tighten the nuts (29) on the bolts (28) to achieve locking between the side plates (27). The side shells (2) can be fixedly installed on the circular shell (1), completing the maintenance operation of the screening machine.

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