Impurity and sand removing machine for starch production
By using a rotating hollow cylinder and an anti-overflow and thick-running mechanism in the starch production and sand removal machine, and using a rotating acceleration disc and a spiral diversion channel to achieve constant centrifugal separation, the problem of overflow and thick-running in the prior art is solved. It significantly improves the efficiency and effect of starch removal and sand removal.
Patent Information
- Application Number
- CN202421136980.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-23
AI Technical Summary
The existing starch milk sand removal cyclone is prone to overflow and thickening during the separation process, resulting in a reduction in separation efficiency.
A starch production, decomposition and sand removal machine is designed, using a rotating hollow cylinder and an anti-overflow and thick-running mechanism. The constant centrifugal force separation of the mixture is achieved through the rotating acceleration disc and the spiral diversion groove, so as to avoid the heavy phase being rotated by the light phase. The flow is rewinded, and combined with the multi-stage cyclone sand demixing structure improves separation efficiency.
It effectively solves the overflow and coarse phenomenon, improves the efficiency and effect of starch removal and sand removal, and ensures the purity of starch milk and the effective separation of fine sand.
Smart Images
Figure CN222293949U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of starch production equipment, in particular to a starch production impurity and sand removing machine. Background Art
[0002] In the starch processing process, it is usually necessary to remove impurities and fine sand contained in the starch milk. In the prior art, impurities and fine sand are usually removed by a cyclone. When working, the starch mixture to be processed is pumped into the cyclone from the upper feed pipe at a certain pressure by a pump. Depending on the difference in density between the light and heavy phases or the difference in particle size between coarse and fine particles, two inner and outer vortices are formed in the cyclone. The fine sand with a larger specific gravity (heavy phase) obtains a larger centrifugal force and is thrown to the outer vortex, and the starch milk with a smaller specific gravity (light phase) obtains a smaller centrifugal force and is thrown to the inner vortex. The heavy phase is thrown to the wall of the device and slides down along the wall and is discharged from the bottom flow port, and the light phase flows out from the upper overflow port through the inner vortex.
[0003] The existing starch milk desanding cyclone generally includes a cylindrical body and a conical cylinder. The separated particles are easy to enter the central light medium flow area due to the rebound of the wall, and the particles deposited at the bottom of the cone are easy to be rolled up again and enter the light medium flow area, resulting in serious overflow and coarseness, and the separation efficiency is greatly reduced. Utility Model Content
[0004] The utility model aims to provide a starch production impurity and sand removal machine, which can effectively solve the overflow and coarseness phenomenon caused by fine sand (heavy phase) with high specific gravity being re-rolled up by the vortex flow in the starch milk (light phase) with low specific gravity during the falling process. The starch impurity and sand removal efficiency is high and the effect is good.
[0005] The above technical objectives of the utility model are achieved through the following technical solutions:
[0006] A starch production impurity and sand removing machine comprises a machine body and a cyclone sand remover for removing impurities and sand, the cyclone sand remover comprises a rotating hollow cylinder, both sides of the upper end of the rotating hollow cylinder are respectively provided with a mixture feed port connected to a mixture feed pipe and a starch clean material discharge port connected to a starch clean material discharge pipe, a sand discharge port is provided at the bottom of the rotating hollow cylinder, and an overflow and coarseness prevention mechanism is provided in the inner cavity of the rotating hollow cylinder for preventing overflow and coarseness during the impurity and sand removal process.
[0007] By adopting the above technical scheme, the starch mixture enters the inner cavity of the rotating hollow cylinder of the cyclone desander through the mixture feed pipe at a certain pressure and speed along the tangential direction and performs a circular rotating motion. Under the action of different centrifugal forces on materials of different specific gravities in the starch mixture, the fine sand (heavy phase) with a larger specific gravity obtains a larger centrifugal force and is thrown to the outer layer of the circular motion to form an external vortex, and the starch milk (light phase) with a smaller specific gravity is in the inner layer of the circular motion to form an internal vortex. The fine sand (heavy phase) with a larger specific gravity spirals down along the inner wall of the rotating hollow cylinder to the sand discharge port, while the starch milk (light phase) with a smaller specific gravity spirals upward under the action of the anti-overflow and coarseness mechanism and is discharged from the starch clean material discharge port. The anti-overflow and coarseness mechanism can effectively solve the overflow and coarseness phenomenon caused by the fine sand (heavy phase) with a larger specific gravity being re-rolled up by the internal vortex of the starch milk (light phase) with a smaller specific gravity during the falling process, thereby greatly improving the starch impurity and sand removal effect.
[0008] The utility model is further configured as follows: the anti-overflow and roughing mechanism includes a hollow rotating shaft coaxial with the rotating hollow cylinder, the hollow rotating shaft is located in the inner cavity of the rotating hollow cylinder, the upper end of the hollow rotating shaft is connected to a driving motor fixed on the top of the rotating hollow cylinder, and a plurality of rotating acceleration disks are provided on the hollow rotating shaft, and each rotating acceleration disk is fixed at equal intervals on the outer wall of the hollow rotating shaft located in the rotating hollow cylinder.
[0009] By adopting the above technical solution, the driving motor drives the hollow shaft to rotate after starting, and the rotation of the hollow shaft drives the rotating acceleration disk fixedly connected to the outer wall thereof to rotate at a high speed. The rotating acceleration disk can further accelerate the mixture entering the inner cavity of the rotating hollow cylinder of the cyclone desander during the rotation process, so that the centrifugal force of the heavy phase cyclone and the light phase cyclone in the mixture during the spiral motion is compensated by the amount of resistance reduction, so that the heavy phase cyclone and the light phase cyclone can always be separated with a constant centrifugal force, avoiding the fine sand (heavy phase) with a large specific gravity from being separated along the rotating hollow cylinder. During the spiral descent of the inner wall of the cylinder or the spiral upward movement of starch milk (light phase) with a small specific gravity, the speed of the spiral movement is reduced due to resistance, resulting in overflow and coarseness caused by insufficient centrifugal force. In addition, the rotating acceleration disk can also block and support the mixture moving spirally downward, so that the mixture falls directly on the upper surface of the rotating acceleration disk and accelerates with the rotation of the rotating acceleration disk. This can effectively prevent the mixture from falling too fast, causing the heavy phase vortex and light phase vortex in the mixture to fall into the sand discharge port at the bottom of the rotating hollow cylinder before they can be completely separated. It has a simple structure and is easy to operate.
[0010] The utility model is further configured as follows: the rotating acceleration disk is a conical structure in cross section, the large diameter end of the rotating acceleration disk faces downward, and the portion of the hollow rotating shaft located above the rotating acceleration disk is provided with a plurality of starch separation ports;
[0011] The upper surface of the rotating acceleration disk is provided with a spiral guide groove 1 extending from the edge to the center, and one end of the spiral guide groove 1 close to the center is connected to the starch separation port provided on the hollow rotating shaft;
[0012] A discharge port is provided at the upper end of the hollow rotating shaft, and the discharge port is communicated with a starch clean material discharge port through a connecting pipe, and the connecting pipe is connected to the discharge port through a rotating joint.
[0013] By adopting the above technical scheme, after the mixed material falls on the upper surface of the rotating acceleration disk, the fine sand (heavy phase) with a higher specific gravity obtains a larger centrifugal force under the acceleration of the rotating acceleration disk and is thrown to the outer layer of the circular motion to be mixed into the outer vortex, while the starch milk (light phase) with a lower specific gravity obtains a smaller centrifugal force after falling on the upper surface of the rotating acceleration disk and is thrown to the inner layer of the circular motion to be mixed into the inner vortex or moves upward along the spiral guide groove on the upper surface of the rotating acceleration disk to be mixed into the inner vortex; the fine sand (heavy phase) with a higher specific gravity mixed into the outer vortex is thrown to the inner wall of the rotating hollow cylinder and slides downward along the inner wall of the rotating hollow cylinder, and is discharged by the discharge port. The sand is discharged from the outlet, and the starch milk (light phase) mixed with the internal vortex flow enters the inner cavity of the hollow shaft through the starch separation port on the hollow shaft and continues to move upward until it is discharged from the starch clean material discharge port connected to the starch separation port of the hollow shaft. In this process, the external vortex flow formed by the fine sand (heavy phase) with higher specific gravity and the internal vortex flow formed by the starch milk (light phase) with lower specific gravity are transported and discharged through two different chambers after separation, which further reduces the probability of mixing of the two specific gravity materials, thereby further reducing the probability of overflow and coarseness, and finally achieving the purpose of further improving the starch removal and sand removal effect.
[0014] The utility model is further configured as follows: a second spiral guide groove is provided on the inner wall of the hollow rotating shaft, and the second spiral guide groove passes through each starch separation port in sequence and is connected with each starch separation port.
[0015] By adopting the above technical solution, the spiral guide groove 2 is used to further guide the spiral movement of the starch emulsion (light phase) entering the inner cavity of the hollow shaft, so that the starch emulsion (light phase) can efficiently and smoothly reach the discharge port at the top of the hollow shaft under the guidance of the spiral guide groove 2.
[0016] The utility model is further configured as follows: the rotation direction of the hollow rotating shaft is the same as the swirl direction of the mixture entering the rotating hollow cylinder from the mixture feed port, and the rotation directions of the spiral guide groove 1 and the spiral guide groove 2 are opposite to the swirl direction of the mixture entering the rotating hollow cylinder.
[0017] By adopting the above technical scheme, the rotation direction of the hollow shaft is the same as the swirl direction of the mixture entering the rotating hollow cylinder from the mixture feed port in order to ensure that the rotation direction of the rotating acceleration disk is consistent with the rotation direction of the mixture in the inner cavity of the rotating hollow cylinder of the swirl desander, thereby achieving the effect of further accelerating the mixture in the inner cavity of the rotating hollow cylinder of the swirl desander, and the rotation directions of the spiral guide groove 1 and the spiral guide groove 2 are opposite to the swirl direction of the mixture entering the rotating hollow cylinder. This is because the swirl direction of the starch emulsion (light phase) is opposite to the swirl direction of the mixture entering the rotating hollow cylinder, and the spiral guide groove 1 and the spiral guide groove 2 are used to guide the separated starch emulsion (light phase). Therefore, in order to enable the separated starch emulsion (light phase) to be smoothly mixed into the internal swirl and move upward along the hollow shaft to be discharged, the rotation directions of the spiral guide groove 1 and the spiral guide groove 2 must be opposite to the swirl direction of the mixture entering the rotating hollow cylinder.
[0018] The utility model is further configured as follows: a filter screen is also provided at the discharge port at the upper end of the hollow rotating shaft.
[0019] By adopting the above technical solution, the filter is used to perform secondary filtration on the discharged starch milk in order to isolate the slag or other large-particle impurities in the starch mixture that are difficult to separate due to their small specific gravity, so that the starch milk discharged from the discharge port at the upper end of the idling shaft has a higher purity.
[0020] The utility model is further configured as follows: a slag discharge port is provided at the bottom of the hollow rotating shaft, and the slag discharge port is connected to a slag discharge pipe through a slag discharge valve.
[0021] By adopting the above technical scheme, the slag discharge port is used to regularly discharge the impurities filtered for the second time in the inner cavity of the hollow shaft, so as to avoid the problem of excessive impurities in the inner cavity of the hollow shaft causing the swirl velocity of the starch emulsion (light phase) to be reduced and the starch impurity and sand removal to be caused. When discharging slag, just open the slag discharge valve, which has a simple structure and is easy to operate.
[0022] The utility model is further configured as follows: the cyclone desander comprises a plurality of cyclone desanders, each cyclone desander is connected in sequence, the starch clean material discharge port of the cyclone desander of the upper stage is communicated with the mixed material feed port of the lower stage, the mixed material feed port of the cyclone desander at the starting end is connected with the mixed material feed pipe, and the starch clean material discharge port of the cyclone desander at the end is connected with the starch clean material discharge pipe.
[0023] By adopting the above technical solution, multiple cyclone desanders are connected in sequence to form a series structure, which can achieve multi-stage desanding and impurity removal effects, greatly improve the desanding and impurity removal effects, and thus effectively improve the quality of starch production.
[0024] The beneficial effects of the utility model are:
[0025] 1. The utility model can effectively solve the overflow and coarseness phenomenon caused by the fine sand (heavy phase) with high specific gravity being re-rolled up by the vortex flow in the starch milk (light phase) with low specific gravity during the falling process through the anti-overflow and coarseness mechanism, which greatly improves the starch impurity and sand removal effect.
[0026] 2. The anti-overflow and coarseness mechanism in the utility model drives the rotating acceleration disk fixedly connected to the outer wall of the hollow rotating shaft to rotate at a high speed when the hollow rotating shaft rotates. The rotating acceleration disk can further accelerate the mixed material entering the inner cavity of the rotating hollow cylinder of the cyclone desander during the rotation process, so that the centrifugal force of the heavy phase cyclone and the light phase cyclone in the mixed material during the spiral motion is compensated by the amount of resistance reduction, so that the heavy phase cyclone and the light phase cyclone can always be separated with a constant centrifugal force, avoiding the fine sand (heavy phase) with a large specific gravity from moving along the inner wall of the rotating hollow cylinder. During the spiral descent or the spiral upward movement of starch milk (light phase) with a small specific gravity, the speed of the spiral movement is reduced due to resistance, resulting in overflow and coarseness caused by insufficient centrifugal force; in addition, the rotating acceleration disk can also block and support the mixture moving downward in the spiral, so that the mixture falls directly on the upper surface of the rotating acceleration disk and accelerates with the rotation of the rotating acceleration disk, which can effectively prevent the mixture from falling too fast, causing the heavy phase vortex and light phase vortex in the mixture to fall into the sand discharge port at the bottom of the rotating hollow cylinder before they can be completely separated. It has a simple structure and is easy to operate.
[0027] 3. The anti-overflow and coarseness mechanism in the utility model transports and discharges the outer vortex formed by the fine sand with high specific gravity (heavy phase) and the inner vortex formed by the starch milk with low specific gravity (light phase) through two different chambers after separation, further reducing the probability of mixing of the two specific gravity materials, thereby further reducing the probability of overflow and coarseness, and finally achieving the purpose of further improving the starch impurity and sand removal effect.
[0028] 4. The filter screen in the utility model is used for secondary filtration of the discharged starch milk, so as to isolate the slag or other large-particle impurities in the starch mixture that are difficult to separate due to their small specific gravity, so that the starch milk discharged from the discharge port at the upper end of the idling shaft has a higher purity.
[0029] 5. The slag discharge port in the utility model is used to discharge the secondary filtered impurities in the inner cavity of the hollow shaft at a regular time, so as to avoid the problem of excessive impurities in the inner cavity of the hollow shaft causing the swirl velocity of the starch emulsion (light phase) to be reduced and the starch impurity and sand removal to be caused. When discharging slag, just open the slag discharge valve, which has a simple structure and is easy to operate.
[0030] 6. The utility model forms a series structure by connecting a plurality of cyclone desanders in sequence, which can achieve the effect of multi-stage desanding and impurity removal, and can greatly improve the effect of desanding and impurity removal, thereby effectively improving the quality of starch production. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0032] Figure 1 The utility model is a schematic diagram of the cross-sectional structure of a cyclone desander in a starch production impurity removal and sand removal machine.
[0033] Figure 2 yes Figure 1 A is a partial enlarged schematic diagram of the middle part.
[0034] Figure 3 yes Figure 1 A partial enlarged schematic diagram of B in the figure.
[0035] Figure 4 The utility model is a structural schematic diagram of a cyclone desander connected in a starch production impurity removal and sand removal machine.
[0036] In the figure, 1. hollow cylinder; 2. mixture feed pipe; 3. mixture feed port; 4. starch clean material discharge pipe; 5. starch clean material discharge port; 6. sand discharge port; 7. hollow shaft; 8. drive motor; 9. rotating acceleration disk; 10. spiral guide groove 1; 11. starch separation port; 12. discharge port; 13. connecting pipe; 14. slag discharge port; 15. slag discharge valve; 16. slag discharge pipe; 17. spiral guide groove 2; 18. filter screen. DETAILED DESCRIPTION
[0037] The technical solution of the utility model will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0038] like Figures 1 to 3 As shown, a starch production impurity and sand removing machine includes a machine body and a cyclone sand remover for removing impurities and sand, the cyclone sand remover includes a rotating hollow cylinder 1, and both sides of the upper end of the rotating hollow cylinder 1 are respectively provided with a mixture feed port 3 connected to a mixture feed pipe 2 and a starch clean material discharge port 5 connected to a starch clean material discharge pipe 4, a bottom of the rotating hollow cylinder 1 is provided with a sand discharge port 6, and the inner cavity of the rotating hollow cylinder 1 is provided with an overflow prevention mechanism for preventing overflow and coarseness during the impurity and sand removal process.
[0039] Furthermore, the anti-overflow and roughing mechanism includes a hollow rotating shaft 7 coaxial with the rotating hollow cylinder 1, and the hollow rotating shaft 7 is located in the inner cavity of the rotating hollow cylinder 1. The upper end of the hollow rotating shaft 7 is connected to the driving motor 8 fixed on the top of the rotating hollow cylinder 1, and a plurality of rotating acceleration disks 9 are provided on the hollow rotating shaft 7, and each rotating acceleration disk 9 is fixed at equal intervals on the outer wall of the hollow rotating shaft 7 located in the rotating hollow cylinder 1.
[0040] Furthermore, the rotating acceleration disk 9 has a conical cross-section, the large diameter end of the rotating acceleration disk 9 faces downward, and the portion of the hollow rotating shaft 7 located above the rotating acceleration disk 9 is provided with a plurality of starch separation ports 11.
[0041] Furthermore, the upper surface of the rotating acceleration disk 9 is provided with a spiral guide groove 10 extending from the edge to the center, and one end of the spiral guide groove 10 close to the center is connected to the starch separation port 11 arranged on the hollow rotating shaft 7.
[0042] Furthermore, a discharge port 12 is provided at the upper end of the hollow rotating shaft 7, and the discharge port 12 is connected to the starch clean material discharge port 5 through a connecting pipe 13, and the connecting pipe 13 is connected to the discharge port 12 through a rotating joint.
[0043] Furthermore, a second spiral guide groove 17 is provided on the inner wall of the hollow rotating shaft 7 , and the second spiral guide groove 17 passes through each starch separation port 11 in sequence and is connected with each starch separation port 11 .
[0044] Furthermore, the rotation direction of the hollow shaft 7 is the same as the swirl direction of the mixture entering the rotating hollow cylinder 1 from the mixture feed port 3, and the rotation directions of the spiral guide groove 1 10 and the spiral guide groove 2 17 are opposite to the swirl direction of the mixture entering the rotating hollow cylinder 1.
[0045] Furthermore, a filter screen 18 is provided at the discharge port 12 at the upper end of the hollow rotating shaft 7 .
[0046] Furthermore, a slag discharge port 14 is provided at the bottom of the hollow rotating shaft 7 , and the slag discharge port 14 is connected to a slag discharge pipe 16 through a slag discharge valve 15 .
[0047] Further, such as Figure 4 As shown, the cyclone desander includes multiple cyclone desanders, each of which is connected in sequence, the starch clean material discharge port 5 of the cyclone desander of the upper stage is connected to the mixture feed port 3 of the lower stage, the mixture feed port 3 of the cyclone desander located at the starting end is connected to the mixture feed pipe 2, and the starch clean material discharge port 5 of the cyclone desander located at the end is connected to the starch clean material discharge pipe 4.
[0048] The working principle of this utility model:
[0049] The starch mixture enters the inner cavity of the rotating hollow cylinder 1 of the cyclone desander along the tangential direction at a certain pressure and speed through the mixture feed pipe 2 and makes a circular rotating motion. Under the action of different centrifugal forces on materials of different specific gravities in the starch mixture, the fine sand (heavy phase) with a larger specific gravity obtains a larger centrifugal force and is thrown to the outer layer of the circular motion to form an external vortex, and the starch milk (light phase) with a smaller specific gravity is in the inner layer of the circular motion to form an internal vortex. The fine sand (heavy phase) with a larger specific gravity spirals down along the inner wall of the rotating hollow cylinder 1 to the sand discharge port, while the starch milk (light phase) with a smaller specific gravity spirals upward under the action of the anti-overflow and coarse running mechanism and is discharged from the starch clean material discharge port.
[0050] At the same time, the driving motor 8 in the anti-overflow and coarseness mechanism is started, driving the hollow rotating shaft 7 to rotate. When the hollow rotating shaft 7 rotates, it drives the rotating acceleration disk 9 fixedly connected to its outer wall to rotate at a high speed. During the rotation process, the rotating acceleration disk 9 can further accelerate the mixture entering the inner cavity of the rotating hollow cylinder 1 of the cyclone desander, so that the centrifugal force exerted on the heavy phase vortex and the light phase vortex in the mixture during the spiral motion is compensated by the amount of resistance reduction, so that the heavy phase vortex and the light phase vortex can always be separated with a constant centrifugal force, avoiding the phenomenon of overflow and coarseness caused by the spiral descent of the heavy sand (heavy phase) along the inner wall of the rotating hollow cylinder 1 or the spiral upward movement of the starch milk (light phase) with a small specific gravity due to the resistance causing the speed of the spiral motion to decrease;
[0051] In addition, the rotating acceleration disk 9 can also block and support the mixture moving spirally downward, so that the mixture falls directly on the upper surface of the rotating acceleration disk 9 and is accelerated as the rotating acceleration disk 9 rotates, which can effectively prevent the mixture from falling too fast and causing the heavy phase vortex and light phase vortex in the mixture to fall into the sand discharge port at the bottom of the rotating hollow cylinder 1 before they can be completely separated. It has a simple structure and is easy to operate, and can effectively solve the overflow and coarsening phenomenon caused by the fine sand (heavy phase) with a large specific gravity being re-rolled up by the vortex in the starch milk (light phase) with a small specific gravity during the falling process, thereby greatly improving the starch impurity and sand removal effect.
[0052] After the mixed material falls on the upper surface of the rotating acceleration disk 9, the fine sand (heavy phase) with a large specific gravity obtains a larger centrifugal force under the acceleration of the rotating acceleration disk 9 and is thrown to the outer layer of the circular motion and mixed into the outer vortex, while the starch milk (light phase) with a small specific gravity obtains a smaller centrifugal force after falling on the upper surface of the rotating acceleration disk 9 and is thrown to the inner layer of the circular motion and mixed into the inner vortex or moves upward along the spiral guide groove on the upper surface of the rotating acceleration disk 9 to be mixed into the inner vortex; the fine sand (heavy phase) with a large specific gravity mixed into the outer vortex is thrown to the inner wall of the rotating hollow cylinder 1 and slides downward along the inner wall of the rotating hollow cylinder 1, and is discharged from the sand discharge port and mixed into The starch milk (light phase) in the inner vortex flows successively through the starch separation port on the hollow shaft 7 along with the vortex flow and enters the inner cavity of the hollow shaft 7 and continues to move upward until it is discharged from the starch clean material discharge port connected to the starch separation port of the hollow shaft 7. In this process, the outer vortex formed by the fine sand (heavy phase) with higher specific gravity and the inner vortex formed by the starch milk (light phase) with lower specific gravity are respectively transported and discharged through two different chambers after separation, which further reduces the probability of mixing of the two specific gravity materials, thereby further reducing the probability of overflow and coarseness, and finally achieving the purpose of further improving the starch impurity and sand removal effect.
[0053] The starch milk (light phase) enters the inner cavity of the hollow shaft 7 and continues to move upward to the starch clean material discharge port connected to the starch separation port, and is discharged through the filter screen 18. The filter screen 18 can perform secondary filtration on the discharged starch milk to isolate the slag or other large-particle impurities in the starch mixture that are difficult to separate due to their small specific gravity, so that the starch milk discharged from the discharge port at the upper end of the idle shaft has a higher purity.
Claims
1. A starch production impurity removal and sand removal machine, characterized in that: The invention comprises a machine body and a cyclone desander for removing impurities and sand, wherein the cyclone desander comprises a rotating hollow cylinder (1), wherein two sides of the upper end of the rotating hollow cylinder (1) are respectively provided with a mixed material feed port (3) connected to a mixed material feed pipe (2) and a starch clean material discharge port (5) connected to a starch clean material discharge pipe (4), a sand discharge port (6) is provided at the bottom of the rotating hollow cylinder (1), and an overflow prevention mechanism for preventing overflow and coarseness during the process of removing impurities and sand is provided in the inner cavity of the rotating hollow cylinder (1).
2. A starch production impurity removal and sand removal machine according to claim 1, characterized in that: The anti-overflow and roughing mechanism comprises a hollow rotating shaft (7) coaxial with a rotating hollow cylinder (1), the hollow rotating shaft (7) being located in the inner cavity of the rotating hollow cylinder (1), the upper end of the hollow rotating shaft (7) being connected to a driving motor (8) fixed to the top of the rotating hollow cylinder (1), and a plurality of rotating acceleration disks (9) being provided on the hollow rotating shaft (7), and each rotating acceleration disk (9) being fixed at equal intervals on the outer wall of the hollow rotating shaft (7) located inside the rotating hollow cylinder (1).
3. A starch production impurity removal and sand removal machine according to claim 2, characterized in that: The rotating acceleration disk (9) has a conical cross-section, the large diameter end of the rotating acceleration disk (9) faces downward, and the portion of the hollow rotating shaft (7) located above the rotating acceleration disk (9) is provided with a plurality of starch separation ports (11).
4. A starch production impurity removal and sand removal machine according to claim 3, characterized in that: The upper surface of the rotating acceleration disk (9) is provided with a spiral guide groove (10) extending from the edge to the center, and the end of the spiral guide groove (10) close to the center is connected to the starch separation port (11) provided on the hollow rotating shaft (7).
5. A starch production impurity removal and sand removal machine according to claim 4, characterized in that: The upper end of the hollow rotating shaft (7) is provided with a discharge port (12), and the discharge port (12) is connected to the starch clean material discharge port (5) through a connecting pipe (13), and the connecting pipe (13) is connected to the discharge port (12) through a rotating joint.
6. A starch production impurity removal and sand removal machine according to claim 5, characterized in that: A second spiral guide groove (17) is provided on the inner wall of the hollow rotating shaft (7), and the second spiral guide groove (17) passes through each starch separation port (11) in sequence and is connected to each starch separation port (11).
7. A starch production impurity removal and sand removal machine according to claim 6, characterized in that: The rotation direction of the hollow rotating shaft (7) is the same as the swirl direction of the mixed material entering the rotating hollow cylinder (1) from the mixed material feed port (3), and the rotation directions of the spiral guide groove 1 (10) and the spiral guide groove 2 (17) are opposite to the swirl direction of the mixed material entering the rotating hollow cylinder (1).
8. The impurity and sand removing machine for starch production according to claim 7, characterized in that: A filter screen (18) is also provided at the discharge port (12) at the upper end of the hollow rotating shaft (7).
9. The impurity and sand removing machine for starch production according to claim 8, characterized in that: A slag discharge port (14) is provided at the bottom of the hollow rotating shaft (7), and the slag discharge port (14) is connected to a slag discharge pipe (16) via a slag discharge valve (15).
10. A starch production impurity and sand removal machine according to any one of claims 1 to 9, characterized in that: The cyclone desander comprises a plurality of cyclone desanders, each of which is connected in sequence; the starch clean material discharge port (5) of the cyclone desander at the previous stage is communicated with the mixed material feed port (3) of the next stage; the mixed material feed port (3) of the cyclone desander at the starting end is connected with the mixed material feed pipe (2); and the starch clean material discharge port (5) of the cyclone desander at the end is connected with the starch clean material discharge pipe (4).