A screening device for potato starch processing and a method of using the same

Abstract

The application relates to the technical field of potato starch slurry processing, and discloses a screening device for potato starch processing and a use method thereof, which comprises an outer treatment table, a feeding hopper is arranged on the top of the outer treatment table, a first sieve plate is arranged on the outer treatment table, a treatment chamber is arranged at the bottom of the outer treatment table, a first chamber plate and a second chamber plate are arranged in the treatment chamber, a driving assembly is arranged on the treatment chamber, a grinding and rubbing assembly, a lifting assembly, a secondary screening assembly and a starch pool are arranged between the first chamber plate and the second chamber plate, the step of rapidly separating starch and dregs effectively removes impurities, provides pure starch slurry for subsequent processing, the design of the secondary screening assembly enables the starch slurry to be further ground into more delicate slurry under the joint action of the bristle brush and the grinding and rubbing strip, the multi-stage screening mode significantly improves the screening efficiency, and the processing time is shortened.

Description

Technical Field

[0001] This invention relates to the field of potato starch slurry processing technology, specifically a screening device for potato starch processing and its usage method. Background Technology

[0002] Potato starch is a white powder extracted from potatoes (including potato skins) through processes such as washing, crushing, filtering, sedimentation, and drying. It possesses excellent viscosity, water absorption, and gelatinization properties, with large particle size and high transparency, making it an important thickener in the food industry. In cooking, potato starch can be used to make jelly, soups, and other dishes, enhancing their texture and flavor. In baking, it can be used to make pastries and bread, improving their fluffiness and smoothness. Furthermore, potato starch is widely used in industries such as papermaking and textiles as a stabilizer and thickener.

[0003] In traditional potato starch processing, it is difficult to completely remove impurities, which leads to more time and effort being spent on dealing with these impurities in subsequent processing. This not only increases production costs, but also results in uneven starch particle size, affecting starch purity. Therefore, a screening device for potato starch processing and its usage method are provided to solve the above-mentioned problems. Summary of the Invention

[0004] To address the problem that existing screening devices for potato starch processing often fail to completely remove impurities and result in uneven starch particle size, this invention provides a screening device for potato starch processing and its usage method to solve the aforementioned problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A screening device for potato starch processing includes an external processing platform, a hopper installed on the top of the external processing platform, a first screen plate installed on the external processing platform, a processing chamber installed at the bottom of the external processing platform, a first chamber plate and a second chamber plate installed inside the processing chamber, a drive assembly installed on the processing chamber, and a grinding assembly, a lifting assembly, a secondary screening assembly and a starch tank arranged between the first chamber plate and the second chamber plate. The grinding assembly is located directly below the first screen plate, and the secondary screening assembly is located between the starch tank and the grinding assembly. The starch tank is fixed to the bottom of the inner wall of the processing chamber, a discharge valve is installed at the bottom of the starch tank, and a discharge assembly is installed on the side of the processing chamber, which is connected to the starch tank. The drive assembly includes a drive motor, a driving bevel gear, and two driven bevel gears. The output shaft of the drive motor is connected to the driving bevel gear via a coupling. The two driven bevel gears mesh with each other, and the driving bevel gear meshes with the adjacent driven bevel gear. The two driven bevel gears mesh with the drive ends of the grinding assembly and the lifting assembly, respectively.

[0006] Preferably, the slag discharge end of the external processing station is equipped with a slag hopper.

[0007] Preferably, the discharge assembly includes a discharge pipe, a linkage plate, a sealing valve, and a sealing plug. One end of the linkage plate extends through and into the interior of the starch tank. A pressing plate is installed at the extended end of the linkage plate. A sealing plug is installed at the other end of the linkage plate. The sealing plug is slidably connected to the interior of the sealing valve to seal the discharge pipe. The linkage plate is equipped with a first reset spring, the top of which is connected to the bottom of the starch tank.

[0008] Preferably, the abrasive assembly includes a rotating disk, which is rotatably connected to the first chamber plate. A rotating block is installed at an eccentric position on the top of the rotating disk. An annular frame is slidably connected to the rotating block. A connecting rod is slidably connected to the side of the annular frame away from the rotating disk. Multiple support rods are installed on the connecting rod. Multiple bristle brushes are slidably connected to the other side of each of the multiple support rods. The top of the inner wall of the outer processing table is equipped with multiple sloping panels, which are respectively attached to both ends of the support rod. The bottom end of the rotating disk is connected to the adjacent driven bevel gear.

[0009] Preferably, a plurality of support blocks are installed on the top of the inner wall of the outer processing table, and the connecting rod is slidably connected to the bottom of the plurality of support blocks in a direction parallel to the ring frame.

[0010] Preferably, a second return spring is provided at the sliding connection between the connecting rod and the ring frame.

[0011] Preferably, the lifting assembly includes a driving gear and two driven gears meshing with the driving gear. The driving gear and the two driven gears are rotatably connected to the first chamber plate. Each of the two driven gears is equipped with a conical toothed ring. A rack is slidably connected to the first chamber plate. The two conical toothed rings mesh with the rack in an alternating manner. The secondary screening assembly has L-shaped rods installed on both sides of its top. One side of the L-shaped rod is connected to a rack, and the other side of the L-shaped rod is slidably connected to the second chamber plate. The back of the driving gear is connected to the adjacent driven bevel gear.

[0012] Preferably, the secondary screening assembly includes a main body, on which multiple lifting plates are rotatably connected, and multiple limiting strips supporting the lifting plates are installed inside the main body. Multiple discharge holes are opened on both sides of the inner wall of the main body.

[0013] Preferably, the main body and the multiple lifting plates are all equipped with abrasive strips that cooperate with the bristle brush.

[0014] A method for using a screening device for potato starch processing includes the following steps: S1. After grinding the potatoes into a paste-like starch, pour the entire mixture from the hopper into the external processing station. S1a. Under the action of gravity, the starch passes through the first sieve plate. At this time, a brush is used in conjunction with the first sieve plate to brush the potato starch slurry. After the potato starch slurry passes through the first sieve plate, it falls onto the secondary sieve assembly through the grinding component. The remaining residue is brushed into the residue hopper for centralized discharge. S2. Start the drive motor to drive the grinding component and the lifting component to work, so that multiple bristle brushes can move back and forth and forward and backward under the operation of the rotating block, the ring frame and the slope panel. S2a. When the secondary screening component rises to contact the bristle brush, it will further grind the potato starch slurry with the grinding strip to form a finer slurry and leave finer impurities on the secondary screening component. S2b. After the secondary screening component descends into the starch tank, if the starch tank is already full of potato starch slurry, the lowering component will press the pressure plate to allow the discharge component to form a passage to discharge the starch slurry after secondary screening. S2c: As the secondary screening component descends into the starch tank, the lifting plate opens upward under the impact of the potato starch slurry in the starch tank, allowing the potato starch slurry to be refilled. After the secondary screening component rises, a portion of the potato starch slurry will remain and continue to work with the bristle brush to form multiple screenings before being discharged through the discharge component, thus improving the final quality of the potato starch slurry. S3. If sieving has been completed or multiple sievings are not required, the valve on the discharge valve can be opened directly to discharge the processed potato starch slurry from the bottom.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This device uses gravity and a brush in conjunction with a first sieve plate to perform initial filtration of potato starch slurry, quickly separating starch and residue. This step effectively removes impurities, providing pure starch slurry for subsequent processing. Furthermore, the design of the secondary sieving component allows the starch slurry to be further ground into a finer slurry under the combined action of the bristle brush and grinding strips. The multi-stage sieving method significantly improves sieving efficiency and shortens processing time.

[0016] 2. This device, driven by the grinding component, allows the bristle brush to move left, right, back, and forth, working in conjunction with the grinding strips on the main body to grind potato starch into finer particles. This fine grinding effect ensures the uniformity and smoothness of the starch, meeting the market demand for high-quality starch. The lifting function of the secondary sieving component allows a portion of the starch slurry to remain during multiple sieving processes, continuing to work with the bristle brush to form a high-quality starch slurry after multiple sievings. This multiple sieving method further improves the quality of the starch.

[0017] 3. The device is designed with a lifting assembly and a discharge assembly. When the starch tank is full, the descent of the lifting assembly triggers the formation of a discharge pipe, automatically exporting the starch slurry after secondary sieving. This design achieves automated discharge, reduces the labor intensity of workers, and improves production efficiency. Furthermore, the lifting plate design allows for automatic opening and refilling of potato starch slurry when the secondary sieving assembly descends into the starch tank. After the secondary sieving assembly rises, the lifting plate closes again under gravity, retaining a portion of the starch slurry for multiple sievings. This automated filling and discharging process further enhances the automation level of the processing. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a perspective view of the invention from a first-person perspective; Figure 2 This is a perspective view of the invention from a second viewpoint; Figure 3 This is a first-view perspective perspective view of the grinding component, lifting component and secondary screening component working together in this invention; Figure 4 This is a second-view perspective perspective view of the grinding component, lifting component, and secondary screening component working together in this invention; Figure 5 This is a perspective view of the discharge component and the starch tank working together in this invention; Figure 6 This is a perspective view of the grinding component in this invention; Figure 7 This is a perspective view of the lifting assembly and the secondary screening assembly working together in this invention; Figure 8 This is a cross-sectional structural diagram of the material discharge assembly and the discharge valve working together in this invention; Figure 9 This is a partial cross-sectional structural diagram of the secondary sieving component in this invention; Figure 10 This is the present invention. Figure 3 Enlarged view of point A in the middle.

[0020] The meanings of the reference numerals in the diagram are as follows: 1. External processing table; 11. Discharge hopper; 12. First screen plate; 13. Slag hopper; 14. Processing chamber; 15. Discharge valve; 16. Starch tank; 17. First chamber plate; 18. Second chamber plate; 2. Drive assembly; 21. Drive motor; 22. Driving bevel gear; 23. Driven bevel gear; 3. Discharge assembly; 31. Discharge pipe; 32. Closing valve; 33. Linkage plate; 34. Pressing plate; 35. Closing plug; 36. First reset. 4. Spring; 5. Grinding assembly; 6. Rotating disk; 7. Rotating block; 8. Ring frame; 9. Connecting rod; 10. Secondary return spring; 11. Support block; 2. Support rod; 3. Sloping panel; 42. Bristle brush; 5. Lifting assembly; 6. Driven gear; 7. Driven gear; 8. Conical gear ring; 9. Rack; 10. L-shaped rod; 11. Secondary screening assembly; 12. Main body; 13. Lifting plate; 24. Grinding strip; 35. Discharge hole; 46. Limiting strip. Detailed Implementation

[0021] To make the purpose, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] Reference Figures 1 to 10 A screening device for potato starch processing includes an external processing platform 1, a feeding hopper 11 installed on the top of the external processing platform 1, a first screen plate 12 provided on the external processing platform 1, a processing chamber 14 installed at the bottom of the external processing platform 1, a first chamber plate 17 and a second chamber plate 18 installed inside the processing chamber 14, a drive assembly 2 installed on the processing chamber 14, and a grinding assembly 4, a lifting assembly 5, a secondary screening assembly 6 and a starch tank 16 arranged between the first chamber plate 17 and the second chamber plate 18. The grinding assembly 4 is located directly below the first screen plate 12, and the secondary screening assembly 6 is located between the starch tank 16 and the grinding assembly 4. The starch tank 16 is fixed to the bottom of the inner wall of the processing chamber 14. A discharge valve 15 is installed at the bottom of the starch tank 16. A discharge assembly 3 is installed on the side of the processing chamber 14. The discharge assembly 3 is connected to the starch tank 16. The drive assembly 2 includes a drive motor 21, a driving bevel gear 22, and two driven bevel gears 23. The output shaft of the drive motor 21 is connected to the driving bevel gear 22 via a coupling. The two driven bevel gears 23 mesh with each other, and the driving bevel gear 22 meshes with the adjacent driven bevel gear 23. The two driven bevel gears 23 mesh with the drive ends of the grinding assembly 4 and the lifting assembly 5, respectively.

[0023] As the core driving component, drive component 2 can drive grinding component 4 and lifting component 5 to work together to process potato starch.

[0024] As a further optimization, the discharge assembly 3 includes a discharge pipe 31, a linkage plate 33, a shut-off valve 32, and a shut-off plug 35. One end of the linkage plate 33 passes through and extends into the interior of the starch tank 16. A pressing plate 34 is installed at the extended end of the linkage plate 33. A shut-off plug 35 is installed at the other end of the linkage plate 33. The shut-off plug 35 is slidably connected to the interior of the shut-off valve 32 to shut off the discharge pipe 31. The linkage plate 33 is equipped with a first reset spring 36, the top of which is connected to the bottom of the starch tank 16.

[0025] The discharge component 3 is equipped to cooperate with the descent of the lifting component 5. When the lifting component 5 descends, it will press the pressing plate 34. At this time, the pressing plate 34 stretches the first reset spring 36 through the linkage plate 33. At the same time, the linkage plate 33 drives the sealing plug 35 in the sealing valve 32 to descend until the sealing plug 35 no longer closes the discharge pipe 31, so that the discharge pipe 31 forms a passage to discharge the starch slurry after secondary screening.

[0026] As a further optimization, the abrasive assembly 4 includes a rotating disk 41, which is rotatably connected to the first chamber plate 17. A rotating block 42 is installed at an eccentric position on the top of the rotating disk 41. An annular frame 43 is slidably connected to the rotating block 42. A connecting rod 44 is slidably connected to the side of the annular frame 43 away from the rotating disk 41. Multiple support rods 47 are installed on the connecting rod 44. Multiple bristle brushes 49 are slidably connected to the other side of the multiple support rods 47. Among them, multiple sloping panels 48 are installed on the top of the inner wall of the outer processing table 1. The multiple sloping panels 48 are respectively attached to the two ends of the support rod 47, and the bottom end of the rotating disk 41 is connected to the adjacent driven bevel gear 23. Multiple support blocks 46 are installed on the top of the inner wall of the outer processing table 1. The connecting rod 44 and the bottom of the multiple support blocks 46 are slidably connected in a direction parallel to the ring frame 43. A second return spring 45 is provided at the sliding connection between the connecting rod 44 and the ring frame 43.

[0027] The lifting assembly 5 includes a drive gear 52 and two driven gears 51 meshing with the drive gear 52. The drive gear 52 and the two driven gears 51 are rotatably connected to the first chamber plate 17. Each of the two driven gears 51 is equipped with a conical toothed ring 53. A rack 54 is slidably connected to the first chamber plate 17. The two conical toothed rings 53 mesh with the rack 54 in an alternating manner. The secondary screening assembly 6 has L-shaped rods 55 installed on both sides of its top. One L-shaped rod 55 is connected to the rack 54, and the other L-shaped rod 55 is slidably connected to the second chamber plate 18. The back of the driving gear 52 is connected to the adjacent driven bevel gear 23.

[0028] The grinding component 4 and the lifting component 5 work together to allow the potato starch to be finely ground in the secondary sieving component 6, further increasing the fineness of the potato starch slurry particles.

[0029] The secondary screening component 6 includes a main body 61, on which multiple lifting plates 62 are rotatably connected, and multiple limiting strips 65 supporting the lifting plates 62 are installed inside the main body 61. Multiple discharge holes 64 are opened on both sides of the inner wall of the main body 61.

[0030] The main body 61 and multiple lifting plates 62 are each equipped with abrasive strips 63 that cooperate with the bristle brush 49.

[0031] The potato starch with a better particle size will flow out through the limiting strip 65 on the side of the main body 61 and flow into the starch pool 16 under the action of gravity, leaving the finer impurities on the secondary screening component 6, thus forming a secondary screening process.

[0032] Furthermore, an additional valve is added to the discharge pipe 31 so that when multiple screenings of potato starch slurry are required, the pressing plate 34 will not directly open the discharge pipe 31. This allows the lifting plate 62 to be used for multiple screenings of potato starch slurry. After screening, the sieved potato starch can be discharged simply by opening the discharge valve 15 or the starch tank 16.

[0033] Furthermore, a torsion spring is installed at the connection between the lifting plate 62 and the main body 61. This torsion spring allows the two lifting plates 62 to rotate continuously in the direction of the limiting strip 65. When impacted by the bottom potato starch slurry, they will be briefly pushed upwards and filled with potato starch slurry. When the entire secondary screening assembly 6 moves upwards, it will cooperate with the limiting strip 65 to close the opening, allowing only the potato starch slurry to be discharged from the discharge hole 64.

[0034] The detailed operating procedure and working principle of this device should be as follows: S1. After grinding the potatoes into a paste-like starch, pour the entire mixture from the hopper 11 into the external processing station 1. S1a. Under the action of gravity, the starch passes through the first sieve plate 12. At this time, a brush is used to brush the potato starch slurry with the first sieve plate 12. After the potato starch slurry passes through the first sieve plate 12 and is sieved, it falls onto the secondary sieve assembly 6 through the grinding assembly 4. At this time, the starch slurry is filtered for the first time, and the residue remaining on the surface of the first sieve plate 12 is brushed into the residue hopper 13 for centralized discharge. S2. Start the drive motor 21 to drive the grinding assembly 4 and the lifting assembly 5 to work. When the drive assembly 2 is working, first start the drive motor 21 to drive the active bevel gear 22 to rotate. The active bevel gear 22 meshes with the two driven bevel gears 23 to drive the grinding assembly 4 and the lifting assembly 5. When the grinding assembly 4 is in the grinding assembly, the driven bevel gear 23 drives the rotating disk 41 to rotate, which in turn drives the rotating block 42 to rotate. The rotating block 42 drives the ring frame 43 to move left and right. The ring frame 43 and the connecting rod 44 drive the bristle brush 49 to move back and forth. However, during the movement, the support rod 47 will cooperate with the slope panel 48, so that the bristle brush 49 can also move left and right. During the movement, the connecting rod 44, the second return spring 45, and the connecting rod 44 and the support block 46 can move left and right stably. When inside the lifting assembly 5, the driven bevel gear 23 drives the driving gear 52. The rotation of the driving gear 52 will drive the two driven gears 51 to rotate. When the two driven gears 51 rotate, they will drive the bevel gear ring 53 to rotate. When one side of the bevel gear ring 53 meshes, it will drive the rack 54 to rise. At the same time, when the other side of the bevel gear ring 53 meshes with the rack 54, it will drive the rack 54 to fall. Thus, the secondary screening assembly 6 will rise or fall through the L-shaped rod 55. S2a. When the secondary screening component 6 rises to contact the bristle brush 49, it will further grind the potato starch slurry with the grinding strip 63 to form a finer slurry. At this time, the bristle brush 49 is driven by the grinding component 4 to grind left and right and back and forth. This grinding effect, together with the grinding strip 63 on the main board 61, can grind potato starch with better particle size. Finally, it flows out through the limiting strip 65 on the side of the main board 61 and flows into the starch pool 16 under the action of gravity, leaving finer impurities on the secondary screening component 6. S2b. After the secondary screening component 6 descends into the starch tank 16, if the starch tank 16 is already full of potato starch slurry, the descent of the lifting component 5 will press the pressing plate 34. At this time, the pressing plate 34 stretches the first reset spring 36 through the linkage plate 33, and the linkage plate 33 drives the sealing plug 35 in the sealing valve 32 to descend until the sealing plug 35 no longer closes the discharge pipe 31, so that the discharge pipe 31 forms a passage to discharge the starch slurry after secondary screening. S2c. As the secondary screening component 6 descends into the starch tank 16, the lifting plate 62 opens upward under the impact of the potato starch slurry in the starch tank 16. At this time, there will be a gap between the two lifting plates 62, and the potato starch slurry can be re-poured through the gap between the two lifting plates 62. After the secondary screening component 6 rises, the two lifting plates 62 close again under the action of gravity and are finally limited and reset by the two limiting strips 65. In this way, a part of the potato starch slurry will remain in the secondary screening component 6 and continue to cooperate with the bristle brush 49 to form multiple screenings before being discharged through the discharge component 3, thereby improving the final quality of the potato starch slurry. S3. If sieving has been completed or multiple sievings are not required, the valve on the discharge valve 15 can be opened directly to discharge the processed potato starch slurry from the bottom.

[0035] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalent elements of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A screening device for potato starch processing, comprising an external processing table, characterized in that: A hopper is installed on the top of the external processing platform, a first sieve plate is provided on the external processing platform, a processing chamber is installed at the bottom of the external processing platform, a first chamber plate and a second chamber plate are installed inside the processing chamber, a drive assembly is installed on the processing chamber, and a grinding assembly, a lifting assembly, a secondary sieving assembly and a starch tank are arranged between the first chamber plate and the second chamber plate. The grinding assembly is located directly below the first sieve plate, and the secondary sieving assembly is located between the starch tank and the grinding assembly. The starch tank is fixed to the bottom of the inner wall of the processing chamber, a discharge valve is installed at the bottom of the starch tank, and a discharge assembly is installed on the side of the processing chamber, which is connected to the starch tank. The drive assembly includes a drive motor, a driving bevel gear, and two driven bevel gears. The output shaft of the drive motor is connected to the driving bevel gear via a coupling. The two driven bevel gears mesh with each other, and the driving bevel gear meshes with the adjacent driven bevel gear. The two driven bevel gears mesh with the drive ends of the grinding assembly and the lifting assembly, respectively. The discharge assembly includes a discharge pipe, a linkage plate, a sealing valve, and a sealing plug. One end of the linkage plate extends through and into the interior of the starch tank. A pressing plate is installed at the extended end of the linkage plate. A sealing plug is installed at the other end of the linkage plate. The sealing plug is slidably connected to the interior of the sealing valve to seal the discharge pipe. A first return spring is installed on the linkage plate. The top of the first return spring is connected to the bottom of the starch tank. The abrasive assembly includes a rotating disk rotatably connected to a first chamber plate. A rotating block is installed at an eccentric position on the top of the rotating disk. An annular frame is slidably connected to the rotating block. A connecting rod is slidably connected to the side of the annular frame away from the rotating disk. Multiple support rods are installed on the connecting rod. Multiple bristle brushes are slidably connected to the other side of each of the multiple support rods. The top of the inner wall of the outer processing table is equipped with multiple sloping panels, which are respectively attached to both ends of the support rod. The bottom end of the rotating disk is connected to the adjacent driven bevel gear. The secondary screening assembly includes a main body, on which multiple lifting plates are rotatably connected, and multiple limiting strips supporting the lifting plates are installed inside the main body. Multiple discharge holes are opened on both sides of the inner wall of the main body. The method of using the above-mentioned screening device includes the following steps: S1. After grinding the potatoes into a paste-like starch, pour the entire mixture from the hopper into the external processing station. S1a. Under the action of gravity, the starch passes through the first sieve plate. At this time, a brush is used in conjunction with the first sieve plate to brush the potato starch slurry. After the potato starch slurry passes through the first sieve plate, it falls onto the secondary sieve assembly through the grinding component. The remaining residue is brushed into the residue hopper for centralized discharge. S2. Start the drive motor to drive the grinding component and the lifting component to work, so that multiple bristle brushes can move back and forth and forward and backward under the operation of the rotating block, the ring frame and the slope panel. S2a. When the secondary screening component rises to contact the bristle brush, it will further grind the potato starch slurry with the grinding strip to form a finer slurry and leave finer impurities on the secondary screening component. S2b. After the secondary screening component descends into the starch tank, if the starch tank is already full of potato starch slurry, the lowering component will press the pressure plate to allow the discharge component to form a passage to discharge the starch slurry after secondary screening. S2c: As the secondary screening component descends into the starch tank, the lifting plate opens upward under the impact of the potato starch slurry in the starch tank, allowing the potato starch slurry to be refilled. After the secondary screening component rises, a portion of the potato starch slurry will remain and continue to work with the bristle brush to form multiple screenings before being discharged through the discharge component, thus improving the final quality of the potato starch slurry. S3. If sieving has been completed or multiple sievings are not required, the valve on the discharge valve can be opened directly to discharge the processed potato starch slurry from the bottom.

2. The screening device for potato starch processing according to claim 1, characterized in that: The external processing station is equipped with a slag hopper at the slag discharge end.

3. The screening device for potato starch processing according to claim 1, characterized in that: Multiple support blocks are installed on the top of the inner wall of the outer processing table, and the connecting rod is slidably connected to the bottom of the multiple support blocks in a direction parallel to the ring frame.

4. The screening device for potato starch processing according to claim 1, characterized in that: A second return spring is provided at the sliding connection between the connecting rod and the ring frame.

5. The screening device for potato starch processing according to claim 1, characterized in that: The lifting assembly includes a drive gear and two driven gears meshing with the drive gear. The drive gear and the two driven gears are rotatably connected to the first chamber plate. Each of the two driven gears is equipped with a conical toothed ring. A rack is slidably connected to the first chamber plate. The two conical toothed rings mesh with the rack in an alternating manner. The secondary screening assembly has L-shaped rods installed on both sides of its top. One side of the L-shaped rod is connected to a rack, and the other side of the L-shaped rod is slidably connected to the second chamber plate. The back of the driving gear is connected to the adjacent driven bevel gear.

6. The screening device for potato starch processing according to claim 1, characterized in that: The main body and multiple lifting plates are all equipped with abrasive strips that cooperate with the bristle brush.

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