Multistage extraction centrifugal screen for flour processing and extraction method

Abstract

The invention relates to the technical field of multi-machine flour processing, in particular to a multi-stage extraction centrifugal screen for flour processing and an extraction method.The centrifugal screen comprises a vertical cylinder, a feeding port is formed in the side edge of the bottom of the vertical cylinder, and a discharging port is formed in the bottom of the circumferential face of the vertical cylinder; a rotating shaft coaxial with the vertical cylinder is rotationally mounted in the vertical cylinder through a bearing; by arranging the multiple screening frames with the screening diameters sequentially reduced from top to bottom, continuous multi-stage screening of flour in the single treatment process is achieved. In other words, each screening frame is divided into a horizontal coarse screening area and an inclined fine screening area, and centrifugal force generated by rotation is combined, so that flour can be evenly distributed on the fine screening areas, and the screening path is prolonged. And the centrifugal force promotes the small-particle-size flour to move outwards, and the large-particle-size flour rolls down to the coarse screening area along the inclined plane under the action of gravity, so that effective separation and automatic classification of the particles with different particle sizes are realized, and the efficient and accurate classification effect is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flour multi-stage processing, in particular to a flour processing multi-stage extraction centrifugal screen and an extraction method. BACKGROUND

[0002] In the modern food processing industry, flour processing is an extremely important link. The existing flour processing method usually includes the steps of cleaning, crushing, grinding and filtering of raw materials, which can improve the quality of flour to a certain extent. However, due to the attachment of impurities in the raw materials and the generation of debris due to the wear of the processing equipment, small density impurities such as fine sand and metal particles may be mixed in the flour, affecting the taste of the flour for subsequent consumption.

[0003] Therefore, in order to improve the taste of flour and ensure the quality of flour, the flour can be further refined after being made, for example, the patent application with the publication number CN217700010U discloses a flour particle multi-stage screening machine which is composed of a screening box and a screening mechanism. The upper surface of the screening box is provided with a discharging disc, a discharging pipe is connected to the right side discharging port of the discharging disc, and the annular grooves on the left and right side upper ends of the screening box are slidably connected with the annular sliding blocks arranged on the outer arc surfaces of the centrifugal screen barrels; the screening mechanism includes a sliding rod, a U-shaped sieve disc and a guide block, the sliding rod is symmetrically installed inside the screening box, the guide blocks are symmetrically arranged on the bottom surface of the U-shaped sieve disc, and the middle sliding holes of the two guide blocks correspondingly arranged in the transverse direction are slidably connected with the sliding rods on the same side.

[0004] Although the screening machine can divide the flour into multiple grades according to the particle size through centrifugal screening and shaking screening, providing convenience for subsequent flour processing, and the screening effect is good, the above-mentioned prior art still has the following problems in the multi-stage processing of flour: during the centrifugal treatment of the flour, the impurities with large specific gravity such as sand will be retained in the screen barrel due to the centrifugal force, and if not cleaned in time, these residual impurities may re-mix into the subsequent batches of flour, forming a secondary pollution risk.

[0005] In addition, if the screened flour is not classified and collected in time according to its particle size, the flour of different particle sizes will be re-mixed, thereby affecting the multi-stage processing technology effect of the flour and ultimately reducing the product quality stability and grade differentiation.

[0006] Based on the above points, the existing technology still has room for improvement in the field of flour multi-stage processing. SUMMARY

[0007] In order to solve the above technical problems, the present application provides a flour processing multi-stage extraction centrifugal screen and an extraction method, which adopts the following technical scheme: The first aspect discloses a multi-stage extraction centrifugal screen for flour processing, comprising a vertical cylinder, a feeding port arranged on the bottom side of the vertical cylinder, a discharging port arranged on the bottom of the circumferential surface of the vertical cylinder, and a rotating shaft coaxial with the vertical cylinder and rotatably arranged in the vertical cylinder.

[0008] A plurality of screen frames are uniformly sleeved on the rotating shaft along the length direction of the rotating shaft, the screen frames are annular structures, and the screening diameters of the screen frames arranged from top to bottom are sequentially reduced.

[0009] An annular line coaxial with the screen frame is arranged on the screen frame, the screen frame is bent by a certain angle along the annular line and is divided into a coarse screening area close to the rotating shaft and a fine screening area away from the rotating shaft, and the fine screening area is arranged in an inclined manner relative to the coarse screening area.

[0010] A collecting frame in a conical structure corresponding to the coarse screening area is arranged on the circumferential surface of the rotating shaft and located at the bottom of the screen frame.

[0011] A plurality of feeding grooves coaxial with the rotating shaft are arranged in the rotating shaft, the feeding grooves are in communication with the collecting frame, and the feeding grooves are used for guiding the materials in the collecting frame out.

[0012] Preferably, the screen frame is slidably sleeved on the rotating shaft.

[0013] The rotating shaft and the vertical cylinder are further jointly provided with a vibration generating mechanism used for driving all the screen frames to synchronously reciprocate along the length direction of the rotating shaft.

[0014] Preferably, the vibration generating mechanism comprises at least one arc-shaped protrusion arranged at the top of the rotating shaft, a linkage rod slidably arranged at the top of the vertical cylinder, and a linkage sliding block arranged at the bottom of the linkage rod and slidably matched with the screen frame closest to the linkage rod.

[0015] The linkage rod has a curved section matched with the arc-shaped protrusion, so that when the rotating shaft rotates, the linkage rod is periodically pushed by the arc-shaped protrusion, and then all the screen frames are driven to reciprocate up and down.

[0016] Preferably, a connecting rod is symmetrically arranged between adjacent screen frames along the diameter direction of the screen frame, so that all the screen frames are linked.

[0017] Preferably, an annular baffle coaxial with the rotating shaft is arranged between the adjacent two screen frames, the annular baffle is arranged on the screen frame closest to the top of the annular baffle, and the top of the annular baffle is coincident with the annular line.

[0018] An annular guide plate is arranged at the end of the annular baffle away from the corresponding screen frame, and the annular guide plate is used for guiding the materials to the lower fine screening area.

[0019] Preferably, an annular rubber belt is arranged between the collection frame and the closest screening frame to the top of the collection frame to prevent material from falling through the gap between the collection frame and the screening frame.

[0020] Preferably, a guide groove is arranged between the top of the feeding groove and the corresponding collection frame to smoothly guide the material in the collection frame into the feeding groove.

[0021] Preferably, the vertical cylindrical side wall is further provided with horizontal connecting rods corresponding to the screening frames, and the bottom of each horizontal connecting rod is uniformly provided with a plurality of elastic stretching and retracting poking rods along the length direction of the horizontal connecting rod, and the end of each poking rod is in contact with the surface of the corresponding fine screening zone.

[0022] Preferably, the coarse screening zone is horizontally arranged.

[0023] In the second aspect, a multi-stage extraction method for flour processing includes the following steps: S1: continuously feeding the flour to be screened into the vertical cylinder from the feeding port, so that the flour falls on the uppermost fine screening zone.

[0024] S2: driving the rotating shaft to rotate, thereby driving the screening frame to rotate and generate centrifugal force, and simultaneously driving the screening frame to reciprocate along the length direction of the rotating shaft.

[0025] S3: screening the flour on the fine screening zone, and the flour meeting the particle size requirement falls to the fine screening zone of the next screening frame, and the flour and impurities not meeting the particle size requirement roll to the coarse screening zone under the action of gravity and vibration, and finally fall into the collection frame.

[0026] S4: discharging the material in the collection frame through the feeding groove, and finally discharging the screened flour from the discharging port.

[0027] In summary, the present application has at least one of the following beneficial technical effects: 1. By arranging a plurality of screening frames with decreasing diameters from top to bottom, continuous multi-stage screening of the flour in a single processing process is achieved. That is, each screening frame is divided into a horizontal coarse screening zone and an inclined fine screening zone, and the centrifugal force generated by rotation enables the flour to be uniformly distributed on the fine screening zone and prolongs the screening path. The centrifugal force promotes the movement of small-particle-size flour outward, while large-particle-size particles roll down the inclined surface to the coarse screening zone under the action of gravity, achieving effective separation and automatic classification of particles of different sizes, thereby ensuring efficient and accurate classification.

[0028] 2. The device effectively solves the technical problems of easy clogging of the screen and poor flowability of flour by the innovative vibration and anti-clogging design. The arc-shaped protrusion at the top of the rotating shaft periodically pushes the linkage rod, driving all the screening frames to reciprocate up and down synchronously. This vibration not only significantly increases the flowability of flour and prevents clogging of the screen holes, but also helps to loosen the large particle impurities stuck on the screen and smoothly slide into the coarse screening area. At the same time, the vibration helps to shake off the flour attached to the annular guide plate and the inner wall of the vertical cylinder, reducing material loss and ensuring continuous and stable operation of the screening process.

[0029] 3. The feeding grooves and guide grooves corresponding to the collection frames are designed inside the rotating shaft, which constitute independent material conveying channels, can discharge different levels of coarse particles and impurities from the large particle size flour and impurities screened out, and timely. In addition, the toggle lever can further assist in uniform distribution and gentle stirring of the material. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic diagram of the three-dimensional structure of the present application.

[0031] Figure 2 is a schematic diagram of the internal three-dimensional structure of the present application.

[0032] Figure 3 is a sectional view of the screening plate of the present application.

[0033] Figure 4 is a partial enlarged view of A of the present application. Figure 3

[0034] Figure 5 is a schematic diagram of the three-dimensional installation structure between the rotating shaft, the screening plate and the collection frame of the present application.

[0035] Figure 6 is a partial enlarged view of B of the present application. Figure 5

[0036] Figure 7 is a sectional view of the installation structure of the rotating shaft and the collection frame of the present application.

[0037] Figure 8 is a bottom view of the rotating shaft of the present application.

[0038] Figure 9 is a schematic diagram of the three-dimensional installation structure between the horizontal connecting rod and the toggle lever of the present application.

[0039] ​​Explanation of reference signs: 1, vertical cylinder; 11, feeding port; 12, discharging port; 13, horizontal connecting rod; 14, poking rod; 2, rotating shaft; 21, connecting rod; 22, linkage rod; 23, linkage slider; 24, arc-shaped protrusion; 25, feeding groove; 26, guide groove; 3, screening frame; 31, annular line; 32, coarse screening zone; 33, fine screening zone; 34, collecting frame; 341, annular rubber belt; 35, annular baffle; 36, annular guide plate. DETAILED DESCRIPTION

[0040] The following will be described in detail in combination with the accompanying drawings. Figures 1 to 9 The present application is further described in detail.

[0041] The embodiment of the present application discloses a multi-stage extraction centrifugal screen for flour processing and an extraction method, which screens the flour by multiple stages of centrifugal screening and timely removes the large-particle flour and impurities remaining on the screening frame.

[0042] Referring to Figure 1 , and Figure 2 A multi-stage extraction centrifugal screen for flour processing comprises a vertical cylinder 1, the bottom side of the vertical cylinder 1 is provided with a feeding port 11, the bottom of the circumferential surface of the vertical cylinder 1 is provided with a discharging port 12, a rotating shaft 2 coaxial with the vertical cylinder 1 is rotatably installed in the vertical cylinder 1, a plurality of screening frames 3 are uniformly sleeved on the rotating shaft 2 along the length direction of the rotating shaft 2, the screening frames 3 are annular structures, and the screening diameters of the screening frames 3 arranged from top to bottom decrease successively.

[0043] Referring to Figure 2 , Figure 3 , and Figure 4 The screening frame 3 is provided with an annular line 31 coaxial with the screening frame 3, the screening frame 3 is bent by a certain angle along the annular line 31 and is divided into two zones, the zone close to the rotating shaft 2 is arranged as a coarse screening zone 32 (horizontally arranged), and the zone away from the rotating shaft 2 is arranged as a fine screening zone 33 (inclined by a certain angle), the circumferential surface of the rotating shaft 2 and located at the bottom of the screening frame 3 is provided with a collecting frame 34 corresponding to the coarse screening zone 32 and in a conical structure, which can collect and process the large-particle flour and impurities screened by the coarse screening zone 32.

[0044] The feeding port 11 is aligned with the fine screening area 33, the rotating shaft 2 penetrates the vertical cylinder 1, the driving motor is installed at the top of the vertical cylinder 1 through the motor base, the output shaft of the driving motor drives the rotating shaft 2 to rotate through the belt transmission, since the driving motor and the belt transmission are the prior art, they are not shown in the figure, in the specific work, the flour to be screened is continuously poured into the vertical cylinder 1 through the feeding port 11, so that the flour falls on the fine screening area 33, at this time, the driving motor is started, the output shaft of the driving motor drives the rotating shaft 2 to rotate, the rotating shaft 2 drives the screening frame 3 to rotate synchronously in the rotating process, and then the flour can be uniformly distributed on the fine screening area 33.

[0045] With the rotation of the rotating shaft 2, the flour can be screened in the fine screening area 33, during the screening process, the flour smaller than the screening diameter of the fine screening area 33 falls into the fine screening area 33 on the next screening frame 3 through the corresponding fine screening area 33, while the flour with large particle size and impurities remain on the corresponding screening frame 3, since the fine screening area 33 is inclined, the flour with large particle size and impurities roll into the coarse screening area 32 through the fine screening area 33 due to gravity, the rotating shaft 2 drives the screening frame 3 to rotate in the rotating process, so that the screening frame 3 has a centrifugal force, the centrifugal force can drive the flour to be screened to have a tendency to move to the side of the screening frame 3, thereby reducing the speed of the flour falling along the fine screening area 33 to the coarse screening area 32, and prolonging the screening time of the flour.

[0046] In addition, the flour has a centrifugal force, so that the flour with small particle size has a tendency to move to the inner wall of the vertical cylinder 1, so that the flour uniformly distributed on the fine screening area 33 is peeled layer by layer, and finally the flour with large particle size and impurities are left, so that the flour with small particle size is separated from the flour with large particle size and impurities, further improving the screening effect of the flour.

[0047] And the flour with large particle size and impurities roll along the inclined fine screening area 33 to the corresponding coarse screening area 32 and then fall into the collection frame 34.

[0048] The collection frame 34 and the screening frame 3 closest to the top of the collection frame 34 are provided with an annular rubber belt 341, one side of the annular rubber belt 341 is installed on the top of the collection frame 34, and the other end of the annular rubber belt 341 is installed on the bottom of the corresponding screening frame 3, which can limit and block the flour with large particle size and impurities screened from the coarse screening area 32, so as to avoid the flour with large particle size and impurities falling into the fine screening area 33 on the next screening frame 3.

[0049] It should be noted that the screen hole diameter of the coarse screening area 32 is large enough, the flour with large particle size and impurities will not remain on the corresponding coarse screening area 32, the amount of flour poured into the vertical cylinder 1 from the feeding port 11 per unit time will not exceed the annular line 31, and is far from the annular line 31.

[0050] Repeat the above actions, through the cooperation of multiple screening frame 3 can be classified flour screening process.

[0051] With reference to Figure 5 And Figure 6 In order to ensure that the flour through the fine screening zone 33 accurately fall in the next fine screening zone 33, the present application is designed between two screening frame 3 are provided with coaxial with the rotating shaft 2 annular baffle 35, annular baffle 35 is installed on the nearest top of the screening frame 3, and the annular baffle 35 top with annular line 31 coincide, annular baffle 35 away from the corresponding one end of the screening frame 3 is provided with annular guide plate 36.

[0052] Wherein the annular guide plate 36 is a hollow structure of circular truncated cone, through the fine screening zone 33 of flour in the process of falling to the next screening frame 3, annular baffle 35 can be blocked by flour processing, to avoid the flour in the process of falling into the next coarse screening zone 32, when the flour falls to the annular guide plate 36, the inclined surface of the annular guide plate 36 can guide the flour to the fine screening zone 33, further make the flour always concentrated in the fine screening zone 33.

[0053] Because the flowability of flour is poor, so the flour is easy to be stuck in the screening frame 3, in order to solve the above problems, the present application is designed for driving all the screening frame 3 along the length direction of the rotating shaft 2 synchronous reciprocating vibration of the vibration generating mechanism, specifically, the adjacent screening frame 3 between along its diameter direction symmetrical arrangement has connecting rod 21, and the connecting rod 21 two ends are installed in the corresponding side of the screening frame 3, vertical cylinder 1 top through the sliding setting has linkage rod 22, linkage rod 22 bottom is installed with linkage sliding block 23, the nearest screening frame 3 from the linkage rod 22 is provided with annular groove matched with linkage sliding block 23, and linkage sliding block 23 limit sliding setting in the annular groove inside, that is, the linkage sliding block 23 will not from the annular groove inside slip.

[0054] Linkage rod 22 located outside the vertical cylinder 1 a section of the setting has the opening downward bending section, rotating shaft 2 top along its circumferential uniform setting has a plurality of with linkage rod 22 away from the linkage sliding block 23 one end matched with the arc convex 24.

[0055] The limiting sliding sleeve of the screening frame 3 is arranged on the rotating shaft 2, and the rotating shaft 2 is provided with a limiting strip matched with the screening frame 3, so that the screening frame 3 can only move up and down along the circumferential surface of the rotating shaft 2. In the specific work, the rotating shaft 2 drives the arc-shaped protrusion 24 to rotate synchronously in the circumferential direction during rotation. When the arc-shaped protrusion 24 contacts the end of the linkage rod 22 away from the linkage sliding block 23, the arc-shaped protrusion 24 that continues to rotate in the circumferential direction can drive the end of the linkage rod 22 away from the linkage sliding block 23 to move to the highest point of the arc-shaped protrusion 24, and the linkage rod 22 rises. During the rising of the linkage rod 22, the corresponding screening frame 3 is driven to move upwards by the linkage sliding block 23. During the upward movement of the corresponding screening frame 3, the remaining screening frames 3 are driven to move upwards synchronously by the connecting rod 21. Thus, the screening frames 3 inside the vertical cylinder 1 can move upwards synchronously.

[0056] When the end of the linkage rod 22 away from the linkage sliding block 23 passes the highest point of the arc-shaped protrusion 24, the linkage rod 22 moves downwards along the arc-shaped protrusion 24 under the gravity of the screening frame 3. At this time, the screening frame 3 moves downwards synchronously through the connecting rod 21. When the end of the linkage rod 22 away from the linkage sliding block 23 contacts the next arc-shaped protrusion 24, the above-mentioned action is repeated. Through the cooperation of the gravity of the screening frame 3, the screening frame 3 can move up and down reciprocatingly. During the reciprocating movement of the screening frame 3, the flour on the screening frame 3 can be shaken, so that the impurities in the flour can be fully exposed, facilitating subsequent screening.

[0057] In addition, the vibrating screening frame 3 can increase the flowability of the flour, avoiding the clogging of the screening frame 3. The vibrating screening frame 3 can also apply an external force to the large-particle-diameter flour and impurities remaining on the fine screening area 33, so that the large-particle-diameter flour and impurities can roll from the fine screening area 33 to the coarse screening area 32. The vibrating screening frame 3 can drive the flour on the annular guide plate 36 to vibrate and fall to the fine screening area 33, avoiding the accumulation of the flour on the annular guide plate 36. At the same time, the reciprocating movement of the screening frame 3 can scrape the flour attached to the inside of the vertical cylinder 1, avoiding the loss of the flour caused by the attachment of the flour to the inner wall of the vertical cylinder 1.

[0058] Referring to Figure 7 and Figure 8 , in order to avoid the accumulation of the screened flour and impurities in the collection frame 34, the structure of the rotating shaft 2 is optimized, that is, a plurality of feeding grooves 25 coaxial with the rotating shaft 2 are arranged in the rotating shaft 2. Through this structure, the residual flour and impurities in the collection frame 34 can be quickly and timely removed, fundamentally avoiding the influence of the accumulation problem on the screening efficiency and precision. In terms of specific structure, the rotating shaft 2 has feeding troughs 25 arranged in a uniform radial pattern centered on its center. The number of feeding troughs 25 corresponds one-to-one with the collection racks 34, ensuring that the sieved material produced by each collection rack 34 has a dedicated conveying channel. At the same time, guide troughs 26 are added between the top of the feeding troughs 25 and the corresponding collection racks 34. Multiple guide troughs 26 are also provided and are evenly distributed along the circumferential direction of the rotating shaft 2 to form a continuous conveying path, providing structural guarantee for the smooth transfer of large-diameter flour and impurities. In actual operation, large-diameter flour and various impurities that have been screened by the coarse sieve section 32 will naturally fall into the corresponding collection rack 34 below. Subsequently, the large-diameter flour and impurities temporarily stored in the collection rack 34 will fall precisely into the corresponding feeding trough 25 through the preset guide trough 26 under the dual action of gravity and the slight centrifugal force of the rotating shaft 2.

[0059] Next, the feeding trough 25, based on its coaxial design with the rotating shaft 2, rotates synchronously with the rotating shaft 2, stably conveying the screened material inside to the outside of the device for timely removal. More importantly, since the feeding trough 25 corresponds one-to-one with the collection rack 34, and the directional conveying function of the guide trough 26, the classification of large flour particles and impurities can be completed simultaneously during the removal process. That is, the screened material collected by different collection racks 34 will be discharged through independent channels to avoid mixing.

[0060] Finally, staff can perform secondary sieving of the large flour particles and impurities after sorting, which not only improves the flour recovery rate but also reduces the interference of impurities on subsequent processing.

[0061] The bottom of the vertical cylinder 1 contains the flour that has been sieved to meet the sieving requirements. Finally, the flour is removed from the bottom of the vertical cylinder 1 through the discharge port 12.

[0062] Example 2, refer to Figure 9 The vertical cylinder 1 is also equipped with a horizontal connecting rod 13 that corresponds one-to-one with the screening frame 3 on its side wall. Multiple actuating rods 14 are evenly installed at the bottom of the horizontal connecting rod 13 along its length direction, and the actuating rods 14 have an automatic retraction structure.

[0063] The lever 14, as an elastic telescopic mechanism, utilizes its automatic retraction characteristic during operation to adaptively and tightly fit the inclined fine screen section 33, maintaining constant contact pressure, and effectively buffering the impact of the screen frame 3's up-and-down reciprocating motion, preventing it from breaking.

[0064] As the sieving frame 3 rotates, the flour flow collides continuously with the agitator 14. The agitator 14 agitates and stirs the flour evenly and gently as it extends and retracts.

[0065] Finally, the application also provides a multi-stage extraction method for flour processing, and the use method thereof comprises the following steps: S1: When the work starts, the flour to be screened is continuously sent into the interior of the device through the feed inlet 11 at the bottom side of the vertical cylinder 1. The flour first falls on the inclined fine screening zone 33 of the uppermost screening frame 3. At the same time, the driving motor is started, and the rotating shaft 2 is driven to rotate through the belt drive, thereby driving all the screening frames 3 to rotate synchronously. Under the action of centrifugal force, the flour is uniformly thrown and distributed on the entire inclined surface of the fine screening zone 33, and is ready for classification screening.

[0066] S2: With the rotation of the screening frame 3, the flour is screened on each layer. The small-particle-size flour smaller than the diameter of the screen hole of the current layer fine screening zone 33 can pass through the screen hole and fall onto the fine screening zone 33 of the next layer screening frame 3, and the falling point is guided by the annular baffle 35 and the annular guide plate 36, and the fine screening of a finer grade is continued. The large-particle-size flour and impurities are rolled along the inclined surface to the horizontal coarse screening zone 32 under the action of gravity, and finally fall into the corresponding conical collecting frame 34.

[0067] S3: While the rotating shaft 2 rotates, the arc-shaped protrusion 24 at the top of the rotating shaft 2 will periodically push the linkage rod 22, and then drive all the screening frames 3 to reciprocate synchronously along the axial direction through the linkage sliding block 23 and the connecting rod 21. The vibration effectively prevents the flour from blocking the screen hole, and assists the large-particle-size flour and impurities to slide into the collecting frame 34. The materials in the collecting frame 34 enter the feeding groove 25 inside the rotating shaft 2 through the guide groove 26 and are discharged outside the device.

[0068] S4: After the multi-layer screening from top to bottom, the fine flour reaching the final required particle size falls into the bottom of the vertical cylinder 1 and is discharged as a finished product through the discharge port 12.

[0069] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the foregoing description, and it is intended to embrace all changes falling within the meaning and range of equivalents of the elements of the claims. Any reference signs in the claims should not be considered as limiting the claims involved.

[0070] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A multi-stage extraction centrifugal sieve for flour processing, comprising a vertical cylinder (1), wherein a feed inlet (11) is provided on the bottom side of the vertical cylinder (1), and a discharge outlet (12) is provided on the bottom of the circumferential surface of the vertical cylinder (1), and a rotating shaft (2) coaxial with the vertical cylinder (1) is rotatably mounted inside the vertical cylinder (1) via bearings, characterized in that: Multiple screening frames (3) are uniformly sleeved on the rotating shaft (2) along its length direction. The screening frames (3) have a ring structure, and the screening diameter of the screening frames (3) arranged from top to bottom decreases sequentially. The screening frame (3) is provided with a circular line (31) coaxial with it. The screening frame (3) bends at a certain angle along the circular line (31) and divides the screening frame (3) into a coarse screening section (32) close to the rotating shaft (2) and a fine screening section (33) away from the rotating shaft (2). The fine screening section (33) is inclined relative to the coarse screening section (32). The rotating shaft (2) is provided with a collection rack (34) on its circumference and at the bottom of the screening rack (3) that corresponds to the coarse screening section (32) and has a conical structure. The rotating shaft (2) has multiple feeding grooves (25) coaxial with it. The feeding grooves (25) are connected to the collection rack (34) and are used to discharge the material in the collection rack (34).

2. The multi-stage extraction centrifugal sieve for flour processing according to claim 1, characterized in that: The screening frame (3) is slidably mounted on the rotating shaft (2); The rotating shaft (2) and the vertical cylinder (1) are also equipped with a vibration generating mechanism for driving all screening frames (3) to reciprocate synchronously along the length of the rotating shaft (2).

3. The multi-stage extraction centrifugal sieve for flour processing according to claim 2, characterized in that: The vibration generating mechanism includes at least one arc-shaped protrusion (24) disposed on the top of the rotating shaft (2), a linkage rod (22) that slides through the top of the vertical cylinder (1), and a linkage slider (23) disposed at the bottom of the linkage rod (22) and slidingly engaged with the nearest screening frame (3). The linkage rod (22) has a curved section that cooperates with the arc protrusion (24), so that when the rotating shaft (2) rotates, the arc protrusion (24) periodically pushes the linkage rod (22), thereby driving all the screening frames (3) to vibrate up and down.

4. The multi-stage extraction centrifugal sieve for flour processing according to claim 3, characterized in that: Connecting rods (21) are symmetrically arranged between adjacent screening frames (3) along their diameter direction, so that all screening frames (3) are linked together.

5. The multi-stage extraction centrifugal sieve for flour processing according to claim 1, characterized in that: An annular baffle (35) coaxial with the rotating shaft (2) is provided between two adjacent screening frames (3). The annular baffle (35) is installed on the screening frame (3) closest to its top, and the top of the annular baffle (35) coincides with the annular line (31). The annular baffle (35) is provided with an annular guide plate (36) at the end away from the corresponding screening frame (3) for guiding the material to the lower fine screening section (33).

6. The multi-stage extraction centrifugal sieve for flour processing according to claim 1, characterized in that: An annular rubber belt (341) is provided between the collection rack (34) and the screening rack (3) closest to its top to prevent material from falling through the gap between the collection rack (34) and the screening rack (3).

7. The multi-stage extraction centrifugal sieve for flour processing according to claim 1, characterized in that: A guide groove (26) is provided between the top of the feeding trough (25) and the corresponding collection rack (34) to smoothly guide the material in the collection rack (34) into the feeding trough (25).

8. The multi-stage extraction centrifugal sieve for flour processing according to claim 1, characterized in that: The vertical cylinder (1) is also equipped with horizontal connecting rods (13) that correspond one-to-one with the screening frame (3). Multiple elastically extendable levers (14) are evenly installed at the bottom of the horizontal connecting rods (13) along their length direction. The ends of the levers (14) are in contact with the surface of the corresponding fine screening section (33).

9. The multi-stage extraction centrifugal sieve for flour processing according to claim 1, characterized in that: The coarse screening zone (32) is set horizontally.

10. A method for multi-stage extraction in flour processing, employing a multi-stage extraction centrifugal sieve for flour processing as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1: The flour to be sieved is continuously fed into the vertical cylinder (1) from the feed inlet (11) so that it falls on the uppermost fine sieve section (33); S2: Drive the rotating shaft (2) to rotate, drive the screening frame (3) to rotate and generate centrifugal force, and at the same time drive the screening frame (3) to reciprocate along the length of the rotating shaft (2); S3: Flour is sieved in the fine sieve section (33). Flour that meets the particle size requirements falls to the fine sieve section (33) of the next sieve rack (3). Flour that does not meet the particle size requirements and impurities roll down to the coarse sieve section (32) under the action of gravity and vibration, and finally fall into the collection rack (34). S4: The material in the collection rack (34) is discharged through the feeding trough (25), and the flour that has passed the final screening is discharged from the discharge port (12).

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