Flour fine filtering device

Abstract

The invention relates to the technical field of flour fine processing, in particular to a flour fine filtering device which comprises two box bodies, the two box bodies are arranged in a linkage mode, when one box body descends, the other box body can ascend in a linkage mode, the box bodies communicate with a flour scattering device, a one-way air inlet part is arranged on the bottom face of each box body, and a one-way flour discharging part is arranged on at least one side face of each box body. The descending box body can enable air flow to enter from the one-way air inlet part and carry flour to be filtered and discharged from the one-way flour discharging part. Air is compressed by descending the box body, flour is discharged through fine powder filtering holes under the pushing of airflow, the penetrating capacity of the flour is improved, the blocking phenomenon is reduced, the airflow carries the flour instead of depending on a vibrating screen surface, flour floating or accumulation is effectively avoided, and the screening uniformity is improved; the two box bodies are arranged in a linkage mode, one box body ascends and descends, mutual traction is achieved, mass balance is achieved, the power load needed by an external driving mechanism is reduced, and energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of flour fine processing, in particular to a flour fine filtering device. Background Art

[0002] Flour is a common food raw material in daily life, and its quality is directly related to the quality and safety of subsequent food processing. In order to ensure the fineness and purity of flour, it is usually necessary to finely screen it to remove impurities, lumps and particles with unqualified particle sizes. At present, flour screening mainly relies on vibration screening equipment, which drives the screen body through a motor to generate high-frequency up and down or multi-directional vibrations, so that the material can be graded on the screen.

[0003] However, due to the characteristics of flour being light, fine, and easy to float, the traditional vibrating screen has shortcomings in actual use. The vibrating screen easily causes the flour to float on the screen surface during high-frequency vibration, resulting in reduced effective screening efficiency. Summary of the invention

[0004] The invention aims to improve the screening efficiency and provides a flour fine filtering device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A flour fine filtering device comprises two boxes, which are arranged in linkage, and when one box descends, the other box can be linked to rise, the boxes are connected to a flour sprinkling device, and the bottom surface is provided with a one-way air inlet portion, and at least one side surface is provided with a one-way powder discharge portion, and the descending box can allow airflow to enter from the one-way air inlet portion and carry flour to be filtered and discharged from the one-way powder discharge portion.

[0007] A first cylinder is fixedly connected to the bottom of the box body, the first cylinder surrounds the one-way air inlet, a second cylinder with an open top is connected below the first cylinder, and the second cylinder is slidably connected to the first cylinder up and down and is sealed.

[0008] The one-way air inlet portion includes an air inlet hole opened on the bottom plate of the box body, and a plurality of second valve plates are rotatably connected above the bottom plate of the box body. When the box body rises, the second valve plates close the air inlet hole, and when the box body descends, the second valve plates open the air inlet hole.

[0009] The one-way powder discharge part includes fine powder filter holes opened on the side plate of the box body, and the side plate of the box body is rotatably connected to a plurality of third valve plates. When the airflow enters from the one-way air inlet part and carries flour to be filtered and discharged from the one-way powder discharge part, the third valve plate opens the fine powder filter holes. When the box body moves upward, the third valve plate closes the fine powder filter holes.

[0010] The side plate of the box body provided with the fine powder filter hole is connected with a first flexible connecting piece, one end of the first flexible connecting piece surrounds the fine powder filter hole, and the other end is connected to the flour collection bag.

[0011] A one-way slag discharge portion is provided on at least one side of the box body, and filtered residue can be discharged from the one-way slag discharge portion to the outside of the box body.

[0012] The one-way slag discharge part includes a filter residue discharge hole opened on the side plate of the box body, and the side plate of the box body is rotatably connected to a plurality of first valve plates. When the box body moves downward, the first valve plates open the filter residue discharge holes, and when the box body moves upward, the first valve plates close the filter residue discharge holes. The box body is installed with a power assembly, and the power assembly can limit the first valve plate and the third valve plate from turning outward and opening;

[0013] And / or, the side plate of the box body provided with the filter residue discharge hole is connected to a third flexible connecting piece, one end of the third flexible connecting piece surrounds the filter residue discharge hole, and the other end is connected to the filter residue collecting bag.

[0014] The one-way slag discharge part and the one-way powder discharge part each correspond to a power component, and the power component includes an electric telescopic part fixed to the outer wall of the box body, the telescopic end of the electric telescopic part is fixedly connected to a bracket, and the bracket is fixedly connected to a plurality of limit blocks, and moving the limit block upward can move away from the third valve plate or the first valve plate; moving the limit block downward can make the third valve plate or the first valve plate abut against the side plate of the box body.

[0015] The filtering device comprises a frame fixed to the ground, the frame is horizontally slidably connected to a rack, the rack is transmission-connected to a reciprocating motion mechanism, both ends of the rack are connected to a pull rope, the pull ropes at both ends are respectively connected to a box, and a fixed pulley is provided between the pull rope and the frame.

[0016] The reciprocating mechanism comprises a gear meshing with a rack, and the gear transmission is connected to a forward and reverse motor;

[0017] Alternatively, the reciprocating motion mechanism includes a power telescopic cylinder fixedly connected to the rack.

[0018] The invention proposes a flour fine filtering device, which has the following beneficial effects: compressed air is released by descending a box body, and flour is discharged through fine powder filter holes under the push of airflow, thereby improving the flour penetration ability and reducing blockage; the airflow carries flour instead of relying on a vibrating screen surface, thereby effectively avoiding flour floating or accumulation and improving screening uniformity; the two boxes are arranged in linkage, one rises and the other falls, pulling each other to achieve mass balance, thereby reducing the power load required for an external driving mechanism and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the filtering state structure of the present invention;

[0020] Figure 2 Schematic diagram of the slag discharge state structure of the present invention;

[0021] Figure 3 Schematic diagram of the enlarged structure of the box body of the present invention.

[0022] In the figure: frame 1, rack 2, gear 3, pull rope 4, fixed pulley 5, fine powder filter hole 6, first flexible connecting member 7, box body 8, second flexible connecting member 9, flour inlet 10, third flexible connecting member 11, first valve plate 12, limit bracket 13, slag discharge hole 14, second valve plate 15, air inlet hole 16, first cylinder body 17, second cylinder body 18, third valve plate 19, bracket 20, limit block 21, electric telescopic member 22. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0024] Refer to Figures 1 - 3 , a fine flour filtering device, comprising two box bodies 8, the two box bodies 8 are arranged in a linkage manner, and when one box body 8 descends, it can drive the other box body 8 to ascend, the box body 8 is connected to a flour spreading device, and a one-way air inlet part is arranged on the bottom surface, and a one-way flour discharging part is arranged on at least one side surface, and when the descending box body 8 enables air flow to enter from the one-way air inlet part and carry flour to be filtered and discharged from the one-way flour discharging part.

[0025] The fine flour filtering device includes two box bodies 8, which are arranged in a linkage manner. Through an external reciprocating driving structure, when one box body 8 descends in the vertical direction, the other box body 8 ascends correspondingly, so as to realize alternating up and down movement.

[0026] A one-way air inlet part is arranged on the bottom surface of each box body 8. When the box body 8 is in a descending state, the bottom space thereof shrinks as it descends, thereby compressing the air in the area where it is located. The compressed air enters the interior of the box body 8 from the one-way air inlet part to form a stable air flow.

[0027] At the same time, a one-way flour discharging part is arranged on one side surface of the box body 8, and this part is the only outlet for the air flow. When the compressed air flows through the interior of the box body 8 along the air flow path, it carries the mixed flour particles to scour along the way and is discharged through the fine powder filter hole 6 in the one-way flour discharging part, thereby completing the screening and discharging of the flour.

[0028] When the box body 8 ascends, the internal space thereof increases, generating negative pressure. The one-way air inlet part automatically closes to prevent backflow, and the fine powder filter hole 6 in the one-way flour discharging part also closes accordingly to prevent the screened flour from falling back or leaking out.

[0029] Since the two boxes 8 are linked and move in opposite directions, their mass changes can balance each other, reducing the energy required for unilateral drive and improving the power utilization efficiency of the device.

[0030] By compressing the air in the descending box 8, the flour is discharged through the fine powder filter holes 6 under the push of the air flow, improving the flour penetration ability, reducing blockage. The air flow carries the flour instead of relying on the vibrating sieve surface, effectively avoiding flour floating or accumulation and improving the screening uniformity; the two boxes 8 are linked, one rising and one falling, pulling each other, achieving mass balance, reducing the power load required by the external drive mechanism and reducing energy consumption.

[0031] A first cylinder 17 is fixedly connected to the bottom of the box 8, the first cylinder 17 surrounds the unidirectional air intake part, a second cylinder 18 with an open top is connected below the first cylinder 17, and the second cylinder 18 is slidably connected to and sealed with the first cylinder 17 in the vertical direction, and a unidirectional air intake valve is provided on the second cylinder 18.

[0032] During the working process, when the box 8 moves downward, the first cylinder 17 descends accordingly and gradually fits into the inside of the second cylinder 18 in a fixed position. At this time, the first cylinder 17 compresses the air inside the second cylinder 18, prompting the air to enter the inside of the box 8 upward along the unidirectional air intake part, forming an upward air flow.

[0033] This air flow then carries the flour in the internal channel of the box 8 and completes the screening operation through the flour discharging part of the device. When the box 8 returns upward, the gas is supplemented into the chamber formed by the first cylinder 17 and the second cylinder 18 through the unidirectional air intake valve.

[0034] The unidirectional air intake part includes an air intake hole 16 opened on the bottom plate of the box 8, and a plurality of second valve plates 15 are rotatably connected above the bottom plate of the box 8. When the box 8 rises, the second valve plates 15 close the air intake hole 16, and when the box 8 descends, the second valve plates 15 open the air intake hole 16.

[0035] The unidirectional air intake part is composed of an air intake hole 16 provided on the bottom plate of the box 8, and this air intake hole 16 is the channel for the air flow to enter the inside of the box 8. Above the air intake hole 16, a plurality of second valve plates 15 are rotatably connected, and these second valve plates 15 are installed above the bottom plate of the box 8 in a hinged or shaft way.

[0036] During the downward movement of the box 8, the bottom space is compressed, a certain air pressure difference is generated between the first cylinder 17 and the second cylinder 18, prompting the external air to enter the inside of the box 8 along the air intake hole 16. At this time, the second valve plates 15 are opened under the action of the air flow pressure, allowing the air to smoothly enter the box 8 through the air intake hole 16.

[0037] When the box body 8 moves upward, the internal space gradually expands. There is no longer continuous air pressure pushing below the air inlet hole 16, and the second valve plate 15 automatically resets under the action of gravity or an elastic structure, rotating back to its original position to close the air inlet hole 16, thereby preventing external air from flowing back or internal dust from leaking out.

[0038] The unidirectional flour discharging part includes fine powder filter holes 6 opened on the side plate of the box body 8. A number of third valve plates 19 are rotatably connected to the side plate of the box body 8. When the air flow enters from the unidirectional air inlet part and carries flour to be filtered and discharged from the unidirectional flour discharging part, the third valve plates 19 open the fine powder filter holes 6, and when the box body 8 moves upward, the third valve plates 19 close the fine powder filter holes 6; the side plate of the box body 8 provided with the fine powder filter holes 6 is connected with a first flexible connecting piece 7. One end of the first flexible connecting piece 7 surrounds the fine powder filter holes 6 and the other end communicates with a flour collection bag.

[0039] The unidirectional flour discharging part is arranged on the side plate of the box body 8 and consists of fine powder filter holes 6. The fine powder filter holes 6 are used to allow the flour carried by the air flow to pass through and complete screening and discharging. Outside the fine powder filter holes 6, a plurality of third valve plates 19 are rotatably connected to the side plate of the box body 8, and these third valve plates 19 are used to control the opening and closing of the fine powder filter holes 6.

[0040] When the box body 8 is in the descending state, the air flow enters the interior of the box body 8 through the unidirectional air inlet part at the bottom. Under its pushing action, it carries the flour and flows outward. At this time, the third valve plates 19 are opened under the action of the air flow pressure, enabling the flour to smoothly pass through the filter holes 6 and complete the transportation from the interior of the box body 8 to the outside.

[0041] When the box body 8 moves upward along with the driving mechanism, the internal air flow stops. The third valve plates 19 rotate and close under the action of gravity or elasticity, closing the fine powder filter holes 6 to prevent the sieved flour from falling back or external dust from entering the interior of the box body 8.

[0042] The side plate where the fine powder filter holes 6 are located is connected with a first flexible connecting piece 7. One end of the first flexible connecting piece 7 surrounds the fine powder filter holes 6 and the other end extends and is connected to the flour collection bag. In this way, after the flour is discharged from the fine powder filter holes 6, it is introduced into the flour collection bag via the first flexible connecting piece 7;

[0043] Of course, the third valve plates 19 can also be manually set to the normally open state. In this case, when the box body moves upward, part of the air flow can enter the box body from the outside through the fine powder filter holes 6, and the movement direction of the air flow is conducive to dredging the fine powder filter holes 6.

[0044] At least one side of the box body 8 is provided with a one-way slag discharging part, and the filtered slag can be discharged from the one-way slag discharging part to the outside of the box body 8; the one-way slag discharging part includes a slag discharging hole 14 opened on the side plate of the box body 8, and a plurality of first valve plates 12 are rotatably connected to the side plate of the box body 8. When the box body 8 moves downward, the first valve plate 12 opens the slag discharging hole 14, and when the box body 8 moves upward, the first valve plate 12 closes the slag discharging hole 14. The box body 8 is equipped with a power assembly, and the power assembly can limit the outward turning and opening of the first valve plate 12 and the third valve plate 19; and / or, the side plate of the box body 8 provided with the slag discharging hole 14 is connected with a third flexible connecting piece 11. One end of the third flexible connecting piece 11 surrounds the slag discharging hole 14, and the other end communicates with a slag collection bag.

[0045] At least one side of the box body 8 is provided with a one-way slag discharging part for timely discharging larger impurities or caked flour that fail to pass through the fine powder filter holes 6 during the screening process. The one-way slag discharging part is realized through the slag discharging hole 14 opened on the side plate of the box body 8;

[0046] Outside the slag discharging hole 14, a plurality of first valve plates 12 are rotatably connected to the side plate of the box body 8. The first valve plate 12 is used to control the opening and closing of the slag discharging hole 14. During the downward movement of the box body 8, the internal air pressure increases, pushing the first valve plate 12 to rotate and open, so that the slag remaining inside the box body 8 is discharged from the slag discharging hole 14 to the outside of the box body 8.

[0047] When the box body 8 rises with the moving mechanism, the first valve plate 12 automatically closes under the action of gravity or elasticity, closing the slag discharging hole 14 to prevent external impurities from being sucked back or the discharged slag inside from flowing back.

[0048] A power assembly is installed on the box body 8. The structure of the power assembly can control the outward turning angle of the first valve plate 12 during operation and limit its opening amplitude. The power assembly can also act on the third valve plate 19. By controlling the opening and closing states of the first valve plate 12 and the third valve plate 19 respectively through the power assembly, when filtration is required, the first valve plate 12 is opened and the third valve plate 19 is closed. After working for a period of time, when slag discharging is required, the first valve plate 12 is closed and the third valve plate 19 is opened, so that impurities are discharged through the slag discharging hole 14. It should be noted that the aperture of the slag discharging hole 14 is larger than the aperture of the fine powder filter hole 6.

[0049] In addition, the side plate of the box body 8 provided with the slag discharging hole 14 is connected with a third flexible connecting piece 11. One end of the third flexible connecting piece 11 surrounds the slag discharging hole 14, and the other end extends and is connected to a slag collection bag. In this way, when the first valve plate 12 is in the open state, the slag can directly enter the slag collection bag through the third flexible connecting piece 11, avoiding scattering and pollution.

[0050] The one-way slag discharge part and the one-way powder discharge part each correspond to a power component, which includes an electric telescopic part 22 fixed on the outer wall of the box body 8, and the telescopic end of the electric telescopic part 22 is fixedly connected to a bracket 20, and the bracket 20 is fixedly connected to a plurality of limit blocks 21. Moving the limit block 21 upward can keep it away from the third valve plate 19 or the first valve plate 12; moving the limit block 21 downward can make the third valve plate 19 or the first valve plate 12 against the side plate of the box body 8.

[0051] The one-way slag discharge part and the one-way powder discharge part are respectively provided with independent power components for controlling the opening and closing states of the corresponding first valve plate 12 and the third valve plate 19. Each power component includes an electric telescopic member 22 fixed to the outer wall of the box body 8, and the telescopic end of the electric telescopic member 22 is connected to the bracket 20, and a plurality of limit blocks 21 are fixedly installed on the bracket 20.

[0052] When the electric telescopic member 22 extends upward, the bracket 20 moves upward accordingly, and the limit block 21 moves away from the corresponding first valve plate 12 or third valve plate 19. At this time, the valve plate can be opened freely under the push of airflow or gravity to realize channel opening.

[0053] When the electric telescopic member 22 contracts downward, the bracket 20 descends accordingly, and the limit block 21 is pressed down to the outside of the first valve plate 12 or the third valve plate 19, pressing it against the side plate of the box body 8, completing the closing of the valve plate and sealing the corresponding channel.

[0054] Under normal filtering conditions, the system moves the electric telescopic part 22 corresponding to the first valve plate 12 upwards, so that the limit block 21 is away from the first valve plate 12, allowing it to open automatically when the box body 8 descends; at the same time, the limit block 21 corresponding to the third valve plate 19 is moved downwards to ensure that the filter residue discharge hole 14 is closed to prevent powder from flowing out.

[0055] When slag discharge is required, the electric telescopic member 22 is controlled to move so that the limit block 21 corresponding to the first valve plate 12 moves downward to close the first valve plate 12; at the same time, the limit block 21 corresponding to the third valve plate 19 moves upward to make it in an openable state. In this way, under the action of the airflow generated by the follow-up movement of the box body 8, the third valve plate 19 opens, and the filter residue discharge hole 14 becomes the main air outlet path, driving the filter residue inside the box body 8 to be discharged smoothly. For example, the action of the electric telescopic member 22 is controlled by a PLC combined with a relay.

[0056] The filtering device comprises a frame 1 fixed to the ground, the frame 1 is horizontally slidably connected to a rack 2, the rack 2 is transmission-connected to a reciprocating mechanism, both ends of the rack 2 are connected to a pull rope 4, the pull ropes 4 at both ends are respectively connected to a box 8, and a fixed pulley 5 is provided between the pull rope 4 and the frame 1. The reciprocating mechanism comprises a gear 3 meshing with the rack 2, the gear 3 is transmission-connected to a forward and reverse motor; or the reciprocating mechanism comprises a power telescopic cylinder fixedly connected to the rack 2.

[0057] The filtering device uses the frame 1 as the basic support structure. The frame 1 is fixedly installed on the ground and is used to carry and guide the operating components of the entire device. On the frame 1, a rack 2 is horizontally slidably arranged, and the rack 2 can perform reciprocating horizontal movement under the guidance of the frame 1.

[0058] The rack 2 is connected to a reciprocating motion mechanism and can achieve power input in two ways. One way is that the rack 2 meshes with a gear 3, and the gear 3 is driven to rotate by a forward and reverse motor, thereby driving the rack 2 to move left and right; the other way is that the rack 2 is directly fixedly connected to a power telescopic cylinder, and the reciprocating sliding of the rack 2 is driven by the telescopic action of the telescopic cylinder.

[0059] One end of a pulling rope 4 is connected to each end of the rack 2. One end of the pulling rope 4 is connected to the rack 2, and the other end is connected to a box body 8. Each pulling rope 4 changes its direction through a fixed pulley 5 installed on the frame 1 during the running path to achieve the transmission of the pulling force. In this way, during the left and right movement of the rack 2, the two pulling ropes 4 can drive the box bodies 8 connected to them respectively to achieve relative up and down movement, that is, one box body 8 rises and the other box body 8 falls to complete the alternating operation. The two box bodies 8 are linked and operated through the pulling ropes 4, and they pull each other to form a mass balance, which can effectively reduce the driving force required for unilateral lifting and improve the energy efficiency utilization.

[0060] The device uses the frame 1 as the basic support structure, and the rack 2 is horizontally slidably connected to the frame 1. The rack 2 is driven by a reciprocating motion mechanism. The reciprocating motion mechanism can be a gear 3 meshing with the rack 2, and the power is provided by a forward and reverse motor; it can also be a power telescopic cylinder fixedly connected to the rack 2. One pulling rope 4 is respectively connected to both ends of the rack 2. After each pulling rope 4 is guided by the fixed pulley 5 on the frame 1, it is connected to a box body 8, so as to realize the reverse vertical lifting movement of the two box bodies 8 during the horizontal movement of the rack 2.

[0061] In the working cycle, the rack 2 reciprocates under the drive of the reciprocating motion mechanism, driving the pulling ropes 4 to pull the box bodies 8 to alternately move up and down. Each time one box body 8 descends, the other box body 8 rises, forming a continuous rhythm of compression and release.

[0062] A first cylinder body 17 is fixed to the bottom of each box body 8. A second cylinder body 18 is inserted and connected below the first cylinder body 17, and the two slide up and down and are hermetically matched. When the box body 8 descends, the first cylinder body 17 penetrates into the second cylinder body 18, compressing the air inside the cylinder. The compressed air enters the inside of the box body 8 through the air inlet hole 16 at the bottom of the box body 8. Above the air inlet hole 16, a plurality of second valve plates 15 are rotatably connected. When the box body 8 descends, the second valve plates 15 are opened under the action of the air flow to achieve one-way air intake; when the box body 8 rises, the second valve plates 15 are closed to prevent gas backflow.

[0063] Compressed air forms an air flow inside the box body 8. This air flow carries the flour and moves it towards the side of the box body 8, and pushes the flour to be discharged through the fine powder filter holes 6. A third valve plate 19 is installed outside the fine powder filter holes 6 and is opened under the action of the air flow to achieve the discharge of the flour. When the box body 8 rises, the third valve plate 19 closes to prevent the powder from flowing back. A first flexible connecting member 7 is connected outside the fine powder filter holes 6, and the flour is transported to the flour collection bag through the first flexible connecting member 7 to achieve pollution-free and high-efficiency collection.

[0064] After working for a period of time, some filter residues that fail to pass through the filter holes accumulate inside the box body 8. At this time, start the slag discharge program, and change the position of the limit block 21 by controlling the electric telescopic member 22. The electric telescopic member 22 is fixed on the outer wall of the box body 8, and its telescopic end is connected to the bracket 20. A number of limit blocks 21 are arranged on the bracket 20. When the limit block 21 moves downward, it presses the first valve plate 12 to close it, and at the same time releases the limit of the third valve plate 19, so that the third valve plate 19 can be opened under the push of the air flow. At this time, the filter residues are discharged through the filter residue discharge holes 14 on the side of the box body 8. A third flexible connecting member 11 is connected outside the filter residue discharge holes 14, and the filter residues enter the filter residue collection bag along this channel to achieve a clean and efficient slag discharge process.

[0065] During the whole working process, the air flow is alternately generated by the alternate up and down movement of the two box bodies 8, driving the continuous filtration of the flour. The electric telescopic member 22 and the limit block 21 control the opening and closing of the third valve plate 19 and the first valve plate 12, complete the switching between the filtration and slag discharge states, and realize an automated, high-efficiency and energy-saving fine flour screening process.

[0066] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes to obtain technical solutions, concepts and designs, which should all be covered within the protection scope of the present invention.

Claims

1. A fine flour filtering device, characterized in that, It includes two boxes (8), the two boxes (8) are linked and arranged, and when one box (8) descends, it can drive the other box (8) to ascend. The box (8) is connected to a flour sprinkling device, and has a one-way air inlet part on the bottom surface and a one-way powder discharge part on at least one side surface. When the descending box (8) allows air flow to enter from the one-way air inlet part and carry flour to be filtered and discharged from the one-way powder discharge part.

2. The fine flour filtering device according to claim 1, characterized in that, A first cylinder body (17) is fixedly connected to the bottom of the box (8), the first cylinder body (17) surrounds the one-way air inlet part, and a second cylinder body (18) with an open top is connected below the first cylinder body (17). The second cylinder body (18) is slidably connected to the first cylinder body (17) up and down and is sealed and assembled.

3. The fine flour filtering device according to claim 2, characterized in that, The one-way air inlet part includes an air inlet hole (16) opened on the bottom plate of the box (8), and a plurality of second valve plates (15) are rotatably connected above the bottom plate of the box (8). When the box (8) ascends, the second valve plates (15) close the air inlet hole (16), and when the box (8) descends, the second valve plates (15) open the air inlet hole (16).

4. A fine flour filtering device according to any one of claims 1-3, characterized in that, The one-way powder discharge part includes fine powder filter holes (6) opened on the side plate of the box (8), and a plurality of third valve plates (19) are rotatably connected to the side plate of the box (8). When the air flow enters from the one-way air inlet part and carries flour to be filtered and discharged from the one-way powder discharge part, the third valve plates (19) open the fine powder filter holes (6), and when the box (8) moves upward, the third valve plates (19) close the fine powder filter holes (6).

5. The fine flour filtering device according to claim 4, characterized in that, The side plate of the box (8) provided with the fine powder filter holes (6) is connected with a first flexible connecting piece (7). One end of the first flexible connecting piece (7) surrounds the fine powder filter holes (6), and the other end is connected to a flour collection bag.

6. The fine flour filtering device according to claim 5, wherein, At least one side of the box (8) is provided with a one-way slag discharge part, and the filtered slag can be discharged to the outside of the box (8) from the one-way slag discharge part.

7. A fine flour filtering device according to claim 6, characterized in that, The one-way slag discharge part includes slag discharge holes (14) opened on the side plate of the box (8), and a plurality of first valve plates (12) are rotatably connected to the side plate of the box (8). When the box (8) moves downward, the first valve plates (12) open the slag discharge holes (14), and when the box (8) moves upward, the first valve plates (12) close the slag discharge holes (14). The box (8) is equipped with a power assembly, and the power assembly can limit the first valve plates (12) and the third valve plates (19) from turning outwards and opening; And / or, the side plate of the box (8) provided with the slag discharge holes (14) is connected with a third flexible connecting piece (11). One end of the third flexible connecting piece (11) surrounds the slag discharge holes (14), and the other end is connected to a slag collection bag.

8. A fine flour filtering device according to claim 7, characterized in that, The one-way slag discharge part and the one-way powder discharge part each correspond to a power assembly, and the power assembly comprises an electric telescopic member (22) fixed to the outer wall of the box body (8), the telescopic end of the electric telescopic member (22) is fixedly connected to a bracket (20), and the bracket (20) is fixedly connected to a plurality of limit blocks (21), and the limit blocks (21) can be moved upward to be away from the third valve plate (19) or the first valve plate (12); and the limit blocks (21) can be moved downward to make the third valve plate (19) or the first valve plate (12) abut against the side plate of the box body (8).

9. A fine flour filtering device according to any one of claims 1-3, 5-8, characterized in that, The filtering device comprises a frame (1) fixed to the ground, the frame (1) being horizontally slidably connected to a rack (2), the rack (2) being transmission-connected to a reciprocating motion mechanism, the two ends of the rack (2) being respectively connected to a pull rope (4), the two ends of the pull rope (4) being respectively connected to a box (8), and a fixed pulley (5) being provided between the pull rope (4) and the frame (1).

10. A fine flour filtering device according to claim 9, characterized in that, The reciprocating mechanism comprises a gear (3) meshing with the rack (2), and the gear (3) is transmission-connected to a forward and reverse motor; Alternatively, the reciprocating motion mechanism comprises a power telescopic cylinder fixedly connected to the rack (2).

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