Laboratory corn starch purification and impurity removal machine and method for obtaining high-purity corn starch

Abstract

The invention discloses a laboratory corn starch purification and impurity removal machine and a high-purity corn starch obtaining method, solves the problems that a laboratory corn purification device in the prior art is large in occupied area and wastes time and labor in operation, and has the beneficial effect of being convenient to operate on the premise of controlling the occupied area. According to the specific scheme, the laboratory corn starch purification and impurity removal machine comprises a base, the base supports a starch solution tank and a water tank, the starch solution tank is provided with an opening for pouring starch with set mass, water is stored in the water tank, the starch solution tank is provided with a pulp outlet pipe and a pulp mixing water pipe, the starch solution tank is further provided with a solution concentration meter, and the water tank is provided with a main water pipe. The main water pipe can be communicated with the size mixing water pipe, the end, away from the starch solution box, of the size outlet pipe is bent downwards, the end, away from the starch solution box, of the size outlet pipe is arranged at the position of at least two stages of flowing grooves, each stage of flowing groove is in a circular ring shape and is provided with a spiral angle, and the flowing grooves are sequentially arranged from top to bottom.

Description

Technical Field

[0001] The invention relates to the technical field of corn starch purification and impurity removal, in particular to a laboratory corn starch purification and impurity removal machine and a method for obtaining high-purity corn starch. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Corn starch is an important nutrient and the largest corn deep processing industry in my country. It is widely used in food, condiments, health products, medicine and other industries. At present, the purification and impurity removal of corn starch is to remove the coarse impurities mixed in the starch solution through a filter screen and static precipitation, but it cannot remove protein.

[0004] In the laboratory, a long trough is selected to separate starch and protein. After studying the new corn starch, the experimenters need to extract corn starch with a higher purity, such as more than 95%, to determine its quality. For this reason, the laboratory sets up a linear trough, and the experimenters manually add slurry. Because the laboratory space is limited, the length of the linear trough is limited, and it is not convenient to extend the length. To ensure the purity of the extraction, for example, to extract higher purity starch from 1 kg of raw materials, the experimenters need to recover the starch solution at the end of the linear trough at least 5-6 times, and pour it into the source of the linear trough until the final discharge liquid is non-starch liquid. If the number of times is less, it will directly affect the purity and yield of the obtained starch. To ensure the purity and yield of starch, the laboratory uses corn starch purification equipment, which is time-consuming and labor-intensive, and there is a problem of delaying the work progress of the experimenters.

[0005] For this reason, the introduction of industrial production equipment has also been considered. However, in order to meet production needs, the corn starch impurity removal equipment used occupies a large area. In other words, the existing corn starch impurity removal equipment occupies a large area and has a complex structure. It is not suitable for laboratories with relatively small spaces. Moreover, the purchase cost of this equipment is relatively high, and it is not suitable for use in laboratories with less frequent use.

[0006] In the prior art, for protein separation from corn starch, the existing equipment mainly includes disc centrifuges and long troughs. For example, Chinese patent CN202110680751.2, an automated separation method and process for protein in corn starch production, separates starch and protein by a disc separator. However, the production and maintenance costs of disc centrifuges are high, and they are not suitable for small-scale starch purification; the noise is relatively high and is not suitable for use in laboratories.

[0007] In summary, laboratory starch equipment has the problems of large structural footprint and low working efficiency. Summary of the invention

[0008] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a laboratory corn starch purification and impurity removal machine to solve the problems that the starch purification equipment used in the laboratory occupies a large area and has low working efficiency.

[0009] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0010] A laboratory corn starch purification and impurity removal machine comprises a base, which supports a starch solution tank and a water tank. The starch solution tank is provided with an opening for pouring starch of a set mass. The water tank stores water. The starch solution tank is provided with a slurry discharge pipe and a slurry adjustment water pipe. The starch solution tank is also provided with a solution concentration measuring meter. The water tank is provided with a main water pipe, which can be connected to the slurry adjustment water pipe. The end of the slurry discharge pipe away from the starch solution tank is bent downward, and the end of the slurry discharge pipe away from the starch solution tank is arranged at a flow trough. The flow trough is provided with at least two levels, and each level of the flow trough is annular and has a spiral angle. The flow troughs are arranged in sequence up and down to extend the flow path of the starch solution while reducing the floor space of the impurity remover. The support body supports each level of the flow trough respectively, and the two adjacent flow troughs are connected. The flow trough has a spiral angle of a set angle. The water tank is connected to the first level of the flow trough to rinse the starch deposited in the flow trough.

[0011] In the laboratory corn starch purification and impurity removal machine as described above, a water outlet guide groove is arranged at the outlet end of the final flow groove, and a water outlet solution tank is arranged below the water outlet guide groove. The water outlet solution tank is supported by the base, and the non-starch solution can flow into the water outlet solution tank through the water outlet guide groove for other purposes.

[0012] As described above, in the laboratory corn starch purification and impurity removal machine, considering the structural layout, the water tank is arranged between the outlet water solution tank and the starch solution tank, and the outlet water solution tank is arranged between the flow trough and the water tank.

[0013] In the laboratory corn starch purification and impurity removal machine as described above, the slurry outlet pipe is provided with a slurry pump, the main water pipe is provided with a water pump, a three-way valve is provided between the main water pipe and the slurry adjusting water pipe, the three-way valve is also connected to the flushing pipeline, one end of the flushing pipeline is bent downward, and the main water pipe is connected to the slurry adjusting water pipe or the flushing pipeline respectively through the setting of the three-way valve, the starch solution is sent into the flow tank through the slurry pump, and the deposited starch is flushed by connecting the main water pipe with the flushing pipeline.

[0014] In the laboratory corn starch purification and impurity removal machine as described above, a solution buffer tank is arranged at the end of the cleaning pipeline, the side length of the solution buffer tank is greater than the inner diameter of the cleaning pipeline, an outlet pipe is arranged at the outlet end of the solution buffer tank, and a valve is arranged at the outlet pipe. The solution buffer tank temporarily stores the starch solution, which is conducive to the starch solution flowing to the flow tank at a uniform speed. After the valve is opened, the starch solution or water in the solution buffer tank flows to the flow tank.

[0015] The laboratory corn starch purification and impurity removal machine as described above also includes a controller, the controller is connected to the three-way valve, the slurry outlet pipe is provided with a slurry pump, the main water pipe is provided with a water pump, and the slurry pump, the water pump and the valve are separately connected to the controller;

[0016] A stirrer is arranged at the starch solution tank, and the stirrer, the solution concentration measuring meter and the controller are connected. The stirrer is used to stir the solution in the starch solution tank, which is beneficial to the uniformity of the starch solution and ensures the accuracy of concentration detection.

[0017] In the laboratory corn starch purification and impurity removal machine as described above, the width of the flow groove is 10-20 cm; the helix angle of the flow groove is 0.5°-1°, so that the starch solution flows evenly and buffered in the flow groove and gradually flows to the next level of flow groove.

[0018] In the laboratory corn starch purification and impurity removal machine as described above, the flow grooves of two adjacent levels are connected by a transition groove, and the transition groove is arranged obliquely downward from the flow groove of the upper level.

[0019] The laboratory corn starch purification and impurity removal machine as described above, a support seat is arranged on one side of the base, the support seat is connected to the base, the top of the support seat is arranged higher than the base, and the support seat supports the support body to support the final flow tank;

[0020] The support body can be retracted, and the support body of the upper-level flow slot can be detached relative to the lower-level flow slot to achieve the increase or decrease of the flow slot.

[0021] In a second aspect, the present invention also provides a method for obtaining high-purity corn starch, using the laboratory corn starch purification and impurity removal machine, comprising the following contents:

[0022] Add a set mass of starch into the starch solution tank;

[0023] The water in the water tank is injected into the starch solution tank through the main water pipe and the slurry mixing water pipe;

[0024] The concentration of the solution is obtained by a starch solution concentration meter, and when the concentration of the solution reaches the set value, the water injection is stopped;

[0025] The starch solution flows to the flow trough through the slurry outlet pipe. When the solution flows along the primary flow trough, part of the starch is deposited at the bottom of the primary flow trough, part of the starch flows into the secondary flow trough, and part of the starch is deposited at the bottom of the secondary flow trough. In this way, every time the starch solution passes through the primary flow trough, the starch will be deposited at the bottom of the flow trough, and the starch concentration of the starch solution will be lower and lower. After being deposited in multiple flow troughs, the starch content in the solution reaches the qualified requirements, and the starch in the starch solution is retained at the bottom of each level of flow trough.

[0026] The water in the water tank flows into the flow troughs at each level in turn to wash away the impurities attached to the surface of the starch deposition layer, so that the starch finally deposited in the flow troughs at each level is high-purity starch.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1) The impurity remover of the present invention is provided with a multi-stage flow trough, which does not need to occupy a large lateral space in the three-dimensional space, and can effectively extend the flow path of the starch solution in the effective space relative to the linear trough. The multi-stage flow trough is arranged from top to bottom, and the slurry outlet pipe is conducive to smoothly guiding the starch solution to the flow trough, so that the flow trough is arranged on the side of the water tank, and the base supports the starch solution tank, the water tank and the flow trough to achieve overall integration, and the overall floor space of the impurity remover is effectively controlled through the reasonable arrangement of the space; the arrangement of the multi-stage flow trough can ensure that the solution at the outlet is a starch-free solution as long as the number of the flow troughs is reasonable, and there is no The test personnel are required to receive the solution at the outlet for multiple times for the next flow. The solution concentration meter can obtain the concentration of the starch solution to ensure the accuracy of the starch solution concentration. When starch and protein flow along the flow trough, due to different gravitational potential energy and flow rates, the protein is in the upper layer and the starch can be deposited. The starch finally deposited in the flow trough after flushing is the obtained corn starch, which is beneficial to ensure the purity and yield of the subsequent starch. It is easy to operate, saves time and effort, and achieves a balance between production cost and ensuring starch purity and yield. Moreover, it will not generate much noise during the overall use process, and is suitable for use in the laboratory.

[0029] 2) In the present invention, the water tank is arranged between the water outlet solution tank and the starch solution tank, and the water outlet solution tank is arranged between the flow trough and the water tank, so as to realize the integration of the whole equipment and ensure that the footprint of the whole equipment is small.

[0030] 3) In the present invention, a three-way valve is arranged between multiple pipelines, and the main water pipe and the slurry mixing water pipe or the flushing pipeline are connected respectively by the arrangement of the three-way valve. The starch solution is sent into the flow tank by the slurry pump, and the water is sent into the flow tank to flush the deposited starch by connecting the main water pipe with the flushing pipeline.

[0031] 4) In the present invention, a controller is provided, which can control the slurry pump, the water pump and the valve, and control the action of the water pump according to the detection value of the solution concentration meter, so that the entire impurity remover can be uniformly controlled by the machine without the need for manual control by the test personnel. The automatic control accuracy is higher, which is more conducive to improving the purity of the starch product finally obtained.

[0032] 5) In the present invention, two adjacent levels of flow slots are supported by a support body, the support body is retractable, and the support body is detachable relative to the next level of flow slots to achieve the increase or decrease of the flow slots.

[0033] 6) The overall structure of the present invention is reasonably arranged. Through the arrangement of multi-stage flow troughs, starch will be deposited at the bottom of the flow trough every time the starch solution flows through a section of the flow trough. At the same time, the starch concentration in the starch solution becomes lower and lower. After being deposited in the multi-stage flow troughs, when it reaches the last stage of the flow trough, the starch content in the solution reaches the qualified requirement. The overall device can obtain high-purity starch by increasing the number of flow troughs under the premise of controllable cost and minimizing the footprint of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0035] Figure 1 is a front view of a laboratory corn starch purification and impurity removal machine according to one or more embodiments of the present invention.

[0036] Figure 2 1 is a top view of a laboratory corn starch purification and impurity removal machine according to one or more embodiments of the present invention.

[0037] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0038] Wherein: 1. base, 2. starch solution tank, 3. agitator, 4. solution concentration meter, 5. slurry pump, 6. slurry outlet pipe, 7. slurry mixing water pipe, 8. water tank, 9. three-way valve, 10. main water pipe, 11. flushing pipe, 12. water pump, 13. solution buffer tank, 14. valve, 15. transition trough, 16. primary flow trough, 17. secondary flow trough, 18. N-stage flow trough, 19. final flow trough, 20. support body, 21. water outlet guide trough, 22. water outlet solution tank, 23. electric control box, 24. bottom plate. DETAILED DESCRIPTION

[0039] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0041] As introduced in the background technology, the prior art laboratory corn starch purification equipment has the problems of large floor space, time-consuming and labor-intensive purification. In order to solve the above technical problems, the present invention proposes a laboratory corn starch purification and impurity removal machine.

[0042] Embodiment 1

[0043] In a typical embodiment of the present invention, reference is made to Figure 1 As shown, a laboratory corn starch purification and impurity removal machine includes a base 1, which supports a starch solution tank 2 and a water tank 8. The starch solution tank 2 is provided with an opening to pour starch of a set mass, and water is stored in the water tank 8. The starch solution tank 2 is provided with a slurry discharge pipe 6 and a slurry adjustment water pipe 7. The starch solution tank 2 is also provided with a solution concentration measuring meter 4. The water tank 8 is provided with a main water pipe 10, and the main water pipe 10 can be connected to the slurry adjustment water pipe 7. The slurry discharge pipe 6 is L-shaped, and the end of the slurry discharge pipe 6 away from the starch solution tank 2 is bent downward, and the end of the slurry discharge pipe 6 away from the starch solution tank 2 is arranged at the flow groove, and the flow groove is provided with at least two levels, and each level of the flow groove 16 is annular and has a spiral angle. The flow grooves are arranged in sequence up and down to extend the flow path of the starch solution while reducing the footprint of the impurity remover. The support body 20 supports each level of the flow groove 16 respectively, and the two adjacent flow grooves are connected. The flow groove has a spiral angle of a set angle, and the water tank 8 is connected to the first level of the flow groove 16 to rinse the starch deposited in the flow groove.

[0044] It is easy to understand that two adjacent flow grooves are connected by a transition groove 15, the top of the transition groove 15 is detachably connected to the upper flow groove by bolts, and the bottom is located above the lower flow groove. The width of the transition groove 15 is consistent with the width of the flow groove. The transition groove 15 is inclined downward from the upper flow groove, so that the starch solution is accelerated when flowing through the transition groove 15, which is conducive to the deposition of the starch solution in the lower flow groove.

[0045] In this embodiment, the base 1 has a set height. Considering the stable support of the flow trough and the rationality of the structural layout, a support seat is set on one side of the base 1, and the support seat is connected to the base 1, and a common bottom plate can be set here. The top of the support seat is higher than the base 1. The support seat supports the support body 20 to support the final flow trough 19 and realizes the total support of the multi-stage flow trough (including the primary flow trough 16, the secondary flow trough 17, the N-stage flow trough 18 and the final flow trough 19, N is greater than or equal to 3). The width of the support seat is smaller than the diameter of the flow trough to facilitate the arrangement of the water outlet tank 22 on one side of the support seat;

[0046] In this embodiment, the flow groove includes a base plate 24, which is a circular part. A baffle is arranged on the outer circle of the base plate 24, and an inner plate is also arranged on the base plate. A flow groove is formed between the baffle and the inner plate. The center of the base plate 24 is connected to the top of the support body 20, and the bottom end of the support body 20 can be welded or detachably connected to the center of the base plate, such as by a threaded structure to achieve a detachable connection, especially the support body 20 of the upper-level flow groove is detachable relative to the lower-level flow groove to increase or decrease the flow groove, so as to ensure the overall length of the flow groove within a limited space.

[0047] Among them, the support body 20 is specifically a support column. In some examples, the support body 20 can be telescopically arranged, such as the support body 20 can be a multi-stage lockable telescopic sleeve (the adjacent two-stage telescopic sleeves can be locked by bolts). In this way, after the number of flow grooves increases, the support body 20 can be extended or shortened, and the transition groove 15 between the two adjacent flow grooves can be replaced accordingly.

[0048] Specifically, the width of the flow groove is 10-20 cm; the spiral angle of the flow groove is 0.5°-1°, so that the starch solution flows evenly and buffered in the flow groove and gradually flows to the next level of flow groove.

[0049] In this embodiment, a water outlet guide groove 21 is provided at the outlet end of the final flow groove 19. The width of the water outlet guide groove 21 is consistent with the width of the final flow groove 19. The water outlet guide groove 21 is inclined downward relative to the horizontal plane. The end of the water outlet guide groove 21 is located at the open end of the water outlet solution tank 22. The water outlet solution tank 22 is supported by the base 1. The non-starch solution flowing out through the multi-stage flow groove can flow into the water outlet solution tank 22 through the water outlet guide groove 21 for other purposes.

[0050] Taking the structural layout into consideration, the water tank 8 is arranged between the water outlet solution tank 22 and the starch solution tank 2, and the water tank 8, the water outlet solution tank 22 and the starch solution tank 2 are arranged with a distance between two adjacent parts, and the water outlet solution tank 22 is arranged between the water tank 8 and a support seat for supporting the flow trough, wherein the water tank 8 and the water outlet solution tank 22 are respectively provided with openings for pouring in or pouring out the liquid inside.

[0051] refer to Figure 1 As shown, the outlet end of the slurry discharge pipe 6 is bent downward to be connected with the solution buffer tank 13, and the slurry discharge pipe 6 is provided with a slurry pump 5, through which the starch solution can be sent into the flow tank through the solution buffer tank 13; the main water pipe is provided with a water pump 12, and a three-way valve 9 is provided between the main water pipe and the slurry mixing water pipe 7, and the three-way valve 9 is also connected with the flushing pipe 11, and the flushing pipe 11 and the slurry mixing water pipe 7 are located in the same plane, and the plane where the flushing pipe is located is parallel to the plane of the slurry discharge pipe 6, and one end of the flushing pipe 11 is bent downward to be connected with the solution buffer tank 13. Through the setting of the three-way valve 9, not only the main water pipe 10 and the slurry mixing water pipe 7 can be connected, but also the main water pipe 10 and the flushing pipe 11 can be connected, so that the flushing pipe 11 can be connected to send water into the flow tank to flush the deposited starch.

[0052] In addition, considering the structural layout, since the slurry discharge pipe is arranged across the water tank, the water tank 8 is arranged above the starch solution tank 2, and the solution concentration detector 4 and the slurry mixing water pipe 7 are respectively placed on both sides of the slurry discharge pipe 6.

[0053] It is easy to understand that a solution buffer tank 13 is set at the end of the cleaning pipeline, the side length of the solution buffer tank 13 is greater than the inner diameter of the cleaning pipeline, an outlet pipe is set at the outlet end of the solution buffer tank 13, and a valve 14 is set at the outlet pipe. The solution buffer tank 13 temporarily stores the starch solution, which is conducive to the starch solution flowing to the flow tank at a uniform speed. After the valve 14 is opened, the starch solution or water in the solution buffer tank 13 flows to the flow tank.

[0054] It should be noted that a controller is also included, which is connected to the three-way valve 9 and the switch valve respectively. The slurry outlet pipe 6 is provided with a slurry pump 5, and the main water pipe 10 is provided with a water pump 12. The slurry pump 5, the water pump 12 and the valve 14 are separately connected to the controller; the controller can be an existing PLC controller or other types of controllers, and the controller can be set in an electric control box 23, and the electric control box 23 is supported by the base 1.

[0055] In this embodiment, an agitator 3 is arranged at the starch solution tank 2, the motor of the agitator 3 is located at the top of the starch solution tank 2, the stirring blades of the agitator 3 are arranged in the starch solution tank 2, the agitator 3 and the solution concentration measuring meter 4 are connected to the controller, and the agitator 3 is used to stir the solution in the starch solution tank 2, which is beneficial to the uniformity of the starch solution and ensures the accuracy of concentration detection.

[0056] The solution concentration meter 4 adopts an existing solution concentration meter, and may also be an existing hydrometer. The hydrometer is used to obtain the density of the solution and convert the density into the concentration of the solution.

[0057] In this embodiment, by setting up a multi-stage flow trough, starch will be deposited at the bottom of the flow trough every time the starch solution flows through a section of the flow trough. At the same time, the starch concentration in the starch solution becomes lower and lower. After being deposited in multiple stages of flow troughs, when it reaches the last stage flow trough 19, the starch content in the solution reaches the qualified requirement. The overall device can obtain high-purity starch by increasing the number of flow troughs under the premise of controllable costs and minimizing the footprint of the device.

[0058] Embodiment 2

[0059] This embodiment provides a method for obtaining high-purity corn starch, using the laboratory corn starch purification and impurity removal machine described in Example 1, including the following contents:

[0060] Adding a set mass of starch into starch solution tank 2;

[0061] The water in the water tank 8 is injected into the starch solution tank 2 through the main water pipe 10 and the slurry mixing water pipe 7;

[0062] The concentration of the solution is obtained by a starch solution concentration meter 4, and when the concentration of the solution reaches a set value, the injection of water is stopped;

[0063] The starch solution flows to the flow trough through the slurry outlet pipe 6. When the solution flows along the primary flow trough 16, part of the starch is deposited at the bottom of the primary flow trough 16, part of the starch flows into the secondary flow trough 17, and part of the starch is deposited at the bottom of the secondary flow trough 17. In this way, each time the starch solution passes through the primary flow trough 16, the starch will be deposited at the bottom of the flow trough, and the starch concentration of the starch solution will be lower and lower. After being deposited in multiple flow troughs, the starch content in the solution reaches the qualified requirement, and the starch in the starch solution is retained at the bottom of each level of the flow trough.

[0064] The water in the water tank 8 flows into the flow grooves of each level in turn to wash away the impurities attached to the surface of the starch deposition layer, so that the starch finally deposited in the flow grooves of each level is high-purity starch.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Laboratory corn starch purification and impurity removal machine, characterized in that, The utility model comprises a base, which supports a starch solution tank and a water tank. The starch solution tank is provided with an opening for pouring starch of a set mass. The water tank stores water. The starch solution tank is provided with a slurry discharge pipe and a slurry adjustment water pipe. The starch solution tank is also provided with a solution concentration measuring meter. The water tank is provided with a main water pipe, which can be connected with the slurry adjustment water pipe. The end of the slurry discharge pipe away from the starch solution tank is bent downward, and the end of the slurry discharge pipe away from the starch solution tank is arranged at a flow groove. The flow groove is provided with at least two levels. Each level of the flow groove is annular and has a spiral angle. The flow grooves are arranged in sequence up and down to extend the flow path of the starch solution while reducing the floor space of the impurity remover. The support body supports each level of the flow groove respectively, and the two adjacent levels of the flow grooves are connected. The flow groove has a spiral angle of a set angle. The water tank is connected with the first level of the flow groove to flush the starch deposited in the flow groove.

2. The laboratory corn starch purification and impurity removal machine according to claim 1, characterized in that, A water outlet guide groove is arranged at the outlet end of the final flow groove, and a water outlet solution tank is arranged below the water outlet guide groove, and the water outlet solution tank is supported by the base.

3. The laboratory corn starch purification and impurity removal machine according to claim 2, characterized in that, The water tank is arranged between the aqueous solution tank and the starch solution tank.

4. The laboratory corn starch purification and impurity removal machine according to claim 1, characterized in that, The slurry outlet pipe is provided with a slurry pump, the main water pipe is provided with a water pump, a three-way valve is provided between the main water pipe and the slurry adjusting water pipe, the three-way valve is also connected to the flushing pipeline, one end of the flushing pipeline is bent downward, and the main water pipe is connected to the slurry adjusting water pipe or the flushing pipeline respectively through the setting of the three-way valve.

5. The laboratory corn starch purification and impurity removal machine according to claim 4, characterized in that, A solution buffer box is arranged at the end of the cleaning pipeline, the side length of the solution buffer box is greater than the inner diameter of the cleaning pipeline, an outlet pipe is arranged at the outlet end of the solution buffer box, and a valve is arranged at the outlet pipe.

6. The laboratory corn starch purification and impurity removal machine according to claim 5, characterized in that: It also includes a controller, which is connected to the three-way valve, the slurry outlet pipe is provided with a slurry pump, the main water pipe is provided with a water pump, and the slurry pump, the water pump and the valve are separately connected to the controller; A stirrer is arranged at the starch solution tank, and the stirrer and the solution concentration measuring meter are connected with the controller.

7. The laboratory corn starch purification and impurity removal machine according to claim 1 is characterized in that: The width of the flow groove is 10-20 cm; the helix angle of the flow groove is 0.5°-1°.

8. The laboratory corn starch purification and impurity removal machine according to claim 1, characterized in that: The flow grooves of two adjacent levels are connected via a transition groove, and the transition groove is arranged obliquely downward from the flow groove of the previous level.

9. The laboratory corn starch purification and impurity removal machine according to claim 1, characterized in that: A support seat is provided on one side of the base, the support seat is connected to the base, the top of the support seat is higher than the base, and the support seat supports the support body to support the final flow tank; The support body can be retracted, and the support body of the upper-level flow slot can be detached relative to the lower-level flow slot to achieve the increase or decrease of the flow slot.

10. A method for obtaining high-purity corn starch, characterized in that: The laboratory corn starch purification and impurity removal machine according to any one of claims 1 to 9 comprises the following contents: Add a set mass of starch into the starch solution tank; The water in the water tank is injected into the starch solution tank through the main water pipe and the slurry mixing water pipe; The concentration of the solution is obtained by a starch solution concentration meter, and when the concentration of the solution reaches the set value, the water injection is stopped; The starch solution flows to the flow trough through the slurry outlet pipe. When the solution flows along the primary flow trough, part of the starch is deposited at the bottom of the primary flow trough, part of the starch flows into the secondary flow trough, and part of the starch is deposited at the bottom of the secondary flow trough. In this way, every time the starch solution passes through the primary flow trough, the starch will be deposited at the bottom of the flow trough, and the starch concentration of the starch solution will be lower and lower. After being deposited in multiple flow troughs, the starch content in the solution reaches the qualified requirements, and the starch in the starch solution is retained at the bottom of each level of flow trough. The water in the water tank flows into the flow troughs at each level in turn to wash away the impurities attached to the surface of the starch deposition layer, so that the starch finally deposited in the flow troughs at each level is high-purity starch.

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