A circulating continuous polysaccharide granule wet screening device and screening method

Abstract

The present invention discloses a circulating continuous polysaccharide granule wet screening device and screening method, comprising a batching tank 1, a batching tank 2 connected to the batching tank 1 through a first circulation pump, a suction filtration tank 1 connected to the batching tank 2 through a second circulation pump, a suction filtration tank 2 connected to the batching tank 1 through a third circulation pump, an overflow port opened on the side wall of the batching tank 2 is higher than the feed port of the batching tank 1, a coarse powder mesh filter screen is provided in the batching tank 1, a fine powder mesh filter screen is provided in the batching tank 2, and a stirring device is provided in the batching tank 1 and the batching tank 2. The screening device used in the present invention has a reasonable structure and is easy to use. It can avoid particle dust during screening and avoid the impact on the surrounding environment. At the same time, the equipment is almost noiseless when working, which is beneficial to the physical and mental health of the staff. The scope of application of the present invention is wide, and it can be applied to the screening of microspheres of different materials and different particle sizes, and the solvent used is recyclable and has extremely high economy.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a circulating continuous polysaccharide particle wet screening device and a screening method. Background Art

[0002] During the production or experimental stages of medical devices, the production of hemostatic or filler particles requires a large number of microspheres of varying sizes. Microspheres are spherical particles with diameters in the micrometer range. To ensure the performance of medical device products, the particle size ratio must be controlled during processing. Using a separation device to screen the particles ensures that the particle size meets production standards. Furthermore, universities and research institutes use large quantities of microspheres of varying sizes when conducting experiments on microsphere drug delivery, making screening devices widely used in the medical technology field.

[0003] For example, Chinese patent CN113649269B discloses a degradable, moisturizing polymer solid water screening device, comprising a frame, sieve plates, distributor, hood fan, and separator. This device features a cycle of air intake through an air inlet hood, vibratory screening through a vibrating sieve plate, and air discharge through an air outlet hood, which prevents dust from forming in the powdery material. However, this screening device can only screen fine and coarse powders and cannot simultaneously screen out medium-sized powders.

[0004] For another example, Chinese patent CN219560478U discloses an efficient screening machine, including a screening device, which includes a coarse material screen, a fine material screen and a fine material screen. A dispersing device is provided above the screening device, and the dispersing device includes a feed box, a discharge bucket is fixedly connected to the lower side of one side of the feed box, and a straight rod is provided in the middle of the discharge bucket, and a number of spiral blades are fixedly installed on the straight rod. The characteristic of this patent is that spiral blades and spiral disks are provided above the screening barrel, and are driven to rotate by a motor so that the mixed material discharged from the feed box is dispersed by the spiral blades and falls on the spiral disk, and then passes through the spiral disk and turns to the inner wall of the screening barrel, slides along the circular inclined plate into the coarse material screen, and then is screened by vibration, so that the mixed material is dispersed before screening, avoiding the coarse and fine materials from mixing with the fine materials, and undergoes secondary processing along the coarse material screen to screen out the fine powder at one time, thereby improving the screening efficiency. However, the above-mentioned screening device will cause dust to fly and spread during use, thereby polluting the surrounding environment, which not only affects the health of the operator, but also increases the possibility of contaminating other products. The screening devices in the prior art mostly adopt a swinging or shaking type, which makes a lot of noise during use, especially the shaking screening equipment, which not only makes a lot of working noise, but also easily shakes out the particles. After completing the screening process, the site needs to be further cleaned, which increases the workload and affects the screening efficiency. In addition, the mechanical screening method will destroy the surface morphology and even the particle size of the microsphere particles, resulting in a decrease in product yield.

[0005] For example, Chinese patent CN219540150U discloses a mixing and agitating machine for processing pesticide powders, which relates to the field of pesticide preparation technology. The vibrating device includes a screening drum, a vibrating motor, a plurality of shock-absorbing springs, and a screen. The screening drum is connected to a feed hose on the side away from the vibrating motor. The mixing tank includes a mixing bin and a collection bin. The mixing bin is provided with a feed port at the end facing the vibrating device, a feed hose is provided between the feed port and the collection chamber, a motor is provided at the end of the collection bin away from the mixing bin, a rotating rod is connected to the end of the motor facing the mixing bin, a spreader is provided between the rotating rod and the feed port, and a collection drum is provided between the collection bin and the mixing bin. The vibrating device can screen raw materials that do not meet the requirements and feed the raw materials that meet the requirements into the collection chamber, thereby preventing agglomerates or large particles from affecting the final product of the pesticide powder. During the vibration process of the vibrating motor, different raw materials can be initially mixed. When applied to the pesticide field, the above-mentioned device still adopts the vibration screening and mixing method. The equipment is noisy and cannot meet the needs of the fine industry that has high requirements on the surface morphology and particle size range of powder particles.

[0006] Based on this, the present invention provides a circulating continuous polysaccharide granule wet screening device and screening method to solve the above technical problems. Summary of the Invention

[0007] The present invention aims to provide a circulating continuous polysaccharide granule wet screening device and screening method to solve the problems of dust generation during screening in the prior art, inability to simultaneously screen out fine powder from a mixture of fine powder, fine powder, and coarse powder, damage to the surface morphology of microsphere particles during screening, reduction in particle size, and reduced yield. The technical solutions adopted by the present invention are as follows:

[0008] The present invention discloses a circulating continuous polysaccharide granule wet screening device, which comprises a batching tank 1, a batching tank 2 connected to the batching tank 1 through a first circulating pump, a suction filtration tank 1 connected to the batching tank 2 through a second circulating pump, and a suction filtration tank 2 connected to the batching tank 1 through a third circulating pump. The overflow port provided on the side wall of the batching tank 2 is higher than the feed port of the batching tank 1. A coarse powder mesh filter screen is provided in the batching tank 1, a fine powder mesh filter screen is provided in the batching tank 2, and a stirring device is provided in both the batching tank 1 and the batching tank 2.

[0009] As a further improvement, one end of the first circulation pump described in the present invention is connected to the discharge port at the bottom of the first batching tank, and the other end is connected to the feed port opened above the second batching tank; one end of the second circulation pump is connected to the suction port opened above the first batching tank, and the other end is connected to the feed port above the first filtration tank; one end of the third circulation pump is connected to the suction port opened above the first batching tank, and the other end is connected to the feed port above the second filtration tank.

[0010] As a further improvement, the device of the present invention also includes a filtration tank three connected to the batching tank two through a fourth circulation pump, one end of the fourth circulation pump is connected to the discharge port at the bottom of the batching tank two, and the other end is connected to the feed port above the filtration tank three.

[0011] As a further improvement, the stirring device described in the present invention includes an explosion-proof variable frequency motor, a detachable hook-type stirring shaft connected to the explosion-proof motor, and a stirring fan connected to the lower end of the stirring shaft. The stirring fan is at a height of 10 to 30 cm above the filter screen to ensure that the polysaccharide particles can be fully stirred and will not settle on the surface of the filter screen.

[0012] As a further improvement, the suction port of the present invention is connected to a suction pipe provided in the batching tank body, one end of the suction pipe is the suction port, and the other end is located above the mesh filter screen and close to the mesh filter screen.

[0013] As a further improvement, the top of the batching tank of the present invention is further provided with a cleaning port and a quick-opening hand hole, and the cleaning port is connected to a sprayer provided in the batching tank.

[0014] As a further improvement, the mesh size of the coarse powder mesh filter of the present invention may be 100-250 meshes, and the mesh size of the fine powder mesh filter may be 250-350 meshes.

[0015] The present invention also discloses a cyclic continuous polysaccharide granule wet screening method, comprising the following steps:

[0016] 1) Clean batching tank 1 and batching tank 2; open the cleaning port and overflow port of batching tank 1 and batching tank 2, close other pipeline interfaces, inject purified water from the cleaning port, and when it reaches the sprayer below the cleaning port, spray it in the tank body in all directions through the sprayer. At the same time, turn on the power supply of the explosion-proof variable frequency motor of the stirring device to make the stirring fan blade start to rotate for stirring and cleaning. After water flows out of the overflow port, close the cleaning port and stop injecting purified water. After cleaning, open the discharge port at the bottom of batching tank 2 and drain the cleaning waste water. Repeat the operation three times to complete the cleaning and turn off the power supply of the explosion-proof variable frequency motor.

[0017] 2) Drain the residual liquid in the batching tank; close the batching tank and all interfaces of the batching tank except the discharge port, start the first circulation pump, drain the residual liquid in the batching tank, and then close the discharge port at the bottom of the batching tank;

[0018] 3) Add the material to be screened; open the overflow port, quick-open hand hole and discharge port of the batching tank one, and at the same time open the first circulation pump and the feed port and overflow port of the batching tank two, inject anhydrous ethanol into the overflow port of the batching tank one through the quick-open hand hole until the alcohol begins to overflow, add the polysaccharide particles to be screened, turn on the explosion-proof variable frequency motor power supply of the stirring device on the batching tank one and the batching tank two, and stir for 20 to 60 minutes to make it dispersed evenly;

[0019] 4) Screening the coarse powder; in the batching tank one, the coarse powder, fine powder and fine powder of the polysaccharide particles are screened for the first time through the coarse powder mesh filter, so that the coarse powder is retained above the coarse powder mesh filter, and the fine powder and fine powder pass through the coarse powder mesh filter and are retained below it and at the bottom of the batching tank, and then the ethanol containing the fine powder and fine powder is transported from the discharge port of the batching tank one through the batching delivery pipe to the feed port of the batching tank two through the first circulation pump, and finally transported to the batching tank two, and the overflowed liquid is returned to the feed port of the batching tank one through the batching delivery pipe through the overflow port of the batching tank two, and the coarse powder screening process is continued for multiple cycles;

[0020] 5) Sieving the fine powder and the fine powder; in the second batching tank, the fine powder and the fine powder of the polysaccharide granules are screened twice through a fine powder mesh filter, so that the fine powder is retained above the fine powder mesh filter, and the fine powder passes through the fine powder mesh filter and is retained below it and at the bottom of the second batching tank;

[0021] 6) Collect the sieved fine powder, coarse powder and fine powder; turn on the second circulation pump to transport the fine powder on the fine powder mesh filter of the second batching tank together with the solution to the filtration tank one, turn on the third circulation pump, and transport the coarse powder on the coarse powder mesh filter of the first batching tank together with the solution to the filtration tank two, turn on the fourth circulation pump, and transport the fine powder under the fine powder mesh filter of the second batching tank together with the solution to the filtration tank three, filter out the solvent in the filtration tank one, the filtration tank two, the filtration tank three and the batching tank two, and finally, respectively package the filtered fine powder, coarse powder and fine powder.

[0022] Based on this, the present invention has the following advantages over existing methods and published patents:

[0023] (1) The screening device used in the present invention has a reasonable structure and is easy to use. It can avoid particle dust during screening and avoid affecting the surrounding environment. At the same time, the equipment is almost noiseless when working, which is beneficial to the physical and mental health of the workers;

[0024] (2) The stirring system used in the screening device of the present invention only stirs the solvent, and the flow of the solvent drives the polysaccharide particles to be evenly dispersed in the solvent, thereby achieving separation through the screen, avoiding the damage to the surface morphology and even particle size of the polysaccharide particles caused by traditional physical and mechanical stirring, and can effectively improve the yield or qualified rate of polysaccharide particles of the target particle size;

[0025] (3) The present invention has a wide range of applications and can be used to screen microspheres of different materials and different particle sizes. By increasing the number of batching tanks, circulation pumps and filtration tanks and configuring filters with different particle size meshes, the screening of various particle sizes can be effectively achieved. In addition, the solvent used can be recycled, which is extremely economical.

[0026] (4) The overflow port of the batching tank 2 of the present invention is higher than the feed port of the batching tank 1, which can realize that the overflow liquid of the batching tank 2 automatically flows to the batching tank 1, thereby realizing automatic screening while improving the screening accuracy and saving energy.

[0027] (5) The pneumatic opening device of the batching tank of the present invention is different from the integral seal or mechanical lock of the traditional batching tank. It is more airtight and effectively prevents the leakage of liquid during use. It can also quickly open the lid after screening is completed, making it easy to clean without leaving any dead corners.

[0028] (6) The suction tube of the present invention is placed almost directly above the filter screen, and several rows of circular holes are evenly arranged at the tail end, which greatly improves the suction efficiency while ensuring that the microspheres of the target particle size left by the screen are sucked up.

[0029] (7) The inner wall of the batching tank of the present invention is specially provided with a screen embedded groove, which can realize the rapid replacement of screens of different mesh sizes, greatly facilitating the switching of production between different varieties of products and further improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall structure of the circulating continuous polysaccharide particle wet screening device of Example 1;

[0031] Figure 2 This is a schematic diagram of the structure of the batching tank 1 of the circulating continuous polysaccharide granule wet screening device;

[0032] Figure 3 A side view of a batching tank 1 of a circulating continuous polysaccharide granule wet screening device;

[0033] Figure 4 This is a schematic diagram of the structure of the batching tank 2 of the circulating continuous polysaccharide granule wet screening device;

[0034] Figure 5 This is a schematic diagram of the structure of the suction tank 1 of the circulating continuous polysaccharide granule wet screening device.

[0035] Figure 6 This is a schematic diagram of the overall structure of the circulating continuous polysaccharide particle wet screening device in Example 2.

[0036] In the picture:

[0037] 1 is a batching tank, 112 is a quick-opening hand hole, 113 is a suction port, 114 is a feed port, 115 is a cleaning port, 116 is a sprayer, 122 is an overflow port, 123 is a pneumatic cover opening device, 124 is a discharge port, and 125 is a suction pipe.

[0038] 2 is the second batching tank;

[0039] 3 is a stirring device, 31 is an explosion-proof variable frequency motor, 32 is a stirring shaft, and 33 is a stirring fan blade;

[0040] 4 is the first circulation pump;

[0041] 5 is the second circulation pump;

[0042] 6 is a coarse powder mesh filter;

[0043] 7 is a batching delivery pipe;

[0044] 8 is a fine powder mesh filter;

[0045] 91 is the first suction tank, 92 is the third circulation pump, 93 is the second suction tank, 94 is the fourth circulation pump, and 95 is the third suction tank. DETAILED DESCRIPTION

[0046] The technical solutions of the present invention will be described clearly and completely below with reference to the accompanying drawings and embodiments. It is obvious that the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0047] Example 1

[0048] Refer to the attached Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5The present invention discloses a circulating continuous polysaccharide granule wet screening device, comprising a batching tank 1, a batching tank 2 connected to the batching tank 1 via a first circulating pump 4, a suction filtration tank 91 connected to the batching tank 2 via a second circulating pump 5, and a suction filtration tank 93 connected to the batching tank 1 via a third circulating pump 92. An overflow port 122 provided on the side wall of the batching tank 2 is higher than a feed port 114 of the batching tank 1. A coarse powder mesh filter 6 is provided in the batching tank 1, a fine powder mesh filter 8 is provided in the batching tank 2, and a stirring device 3 is provided in both the batching tank 1 and the batching tank 2. One end of the first circulation pump 4 is connected to the discharge port 124 at the bottom of the batching tank 1, and the other end is connected to the feed port 114 opened above the batching tank 2. One end of the second circulation pump is connected to the suction port 113 opened above the batching tank, and the other end is connected to the feed port 114 above the suction tank 1 91. One end of the third circulation pump 92 is connected to the suction port 113 opened above the batching tank 1, and the other end is connected to the feed port 114 above the suction tank 2 93. The stirring device 3 includes an explosion-proof variable frequency motor 31, a detachable hook-type stirring shaft 32 connected to the explosion-proof motor, and a stirring blade 33 connected to the lower end of the stirring shaft 32. The stirring blade 33 is at a height of 10 to 30 cm above the filter screen to ensure that the polysaccharide particles can be fully stirred and will not settle on the filter screen surface.

[0049] The present invention's batching tank features a suction port 113 on top, connected to a suction pipe 125 within the tank. One end of the suction pipe 125 is the suction port 113, while the other end is located above and adjacent to the mesh filter. The tank also features a cleaning port 115 and a quick-access handhole 112. The cleaning port 115 is connected to a sprayer 116 within the tank. A pneumatic lid-opening device 123 is located between the tank's lid and the tank body, opening the seal and separating it from the tank body.

[0050] The mesh size of the coarse powder mesh filter 6 can be 100-250 mesh, and the mesh size of the fine powder mesh filter 8 can be 250-350 mesh. The fine powder mesh filter 8 is located below the stirring blades 33 in the cylinder of the batching tank 2 and is used to screen the fine powder and fine powder. The second circulating pump 5 is located between the batching tank 2 and the filtration device. It is connected to the fine powder suction port 113 of the batching tank 2 and the feed port 114 of the filtration tank 1 through the batching pipe 7. It is used to transport the sieved fine powder polysaccharide particles and can achieve solid-liquid separation of the transported polysaccharide suspension. The filtration tank 2 can achieve solid-liquid separation of the transported polysaccharide suspension. The third circulating pump 92 is connected to the suction port 113 of the batching tank 1 and the feed port 114 of the filtration tank 2 through the batching pipe 7. It can filter the powder on the filter screen of the batching tank 1 into the filtration tank 2.

[0051] The specific use of a circulating continuous polysaccharide granule wet screening device provided in an embodiment of the present invention includes the following steps:

[0052] Step 1: Clean the batching tanks of the screening device. Open the cleaning port 115 and overflow port 122 of batching tank 1, and the cleaning port 115 and overflow port 122 of batching tank 2. Close other pipe connections. Pour purified water into both batching tanks from the cleaning port 115. When it reaches the sprayer 116 below the cleaning port 115, spray it all over the tank bodies of batching tank 1 and batching tank 2 through the sprayer 116. Simultaneously, turn on the power supply of the explosion-proof variable frequency motor 31 of the stirring system, causing the stirring blades 33 to start rotating to stir and clean. After water flows out of the overflow port 122, close the cleaning port 115 of both batching tanks and stop injecting purified water. After cleaning for about 10 minutes, open the discharge port 124 at the bottom of batching tank 2 and drain the cleaning wastewater. Repeat this operation three times to complete the cleaning, and turn off the power supply of the explosion-proof variable frequency motor 31.

[0053] Step 2: Drain the residual liquid in the batching tank 1. Close the batching tank and all interfaces of the batching tank except the discharge port 124, start the first circulation pump 4, drain the residual liquid in the batching tank, and then close the discharge port 124 at the bottom of the batching tank.

[0054] Step 3: Add the material to be screened. Open the overflow port 122, quick-open hand hole 112, and discharge port 124 of batching tank 1. Simultaneously, open the first circulation pump 4 and the feed port 114 and overflow port 122 of batching tank 2. Inject anhydrous ethanol into the overflow port 122 of batching tank 1 through the quick-open hand hole 112 until the alcohol begins to overflow. Add polysaccharide particles (such as starch, sodium carboxymethyl starch, chitosan, chitosan, sodium carboxymethyl cellulose, etc.) and the material to be screened. Turn on the explosion-proof variable frequency motor 31 of the stirring device 3 on batching tank 1 and batching tank 2, and stir for 20-60 minutes to achieve even dispersion.

[0055] Step 4: Screening the coarse powder. Within batching tank 1, the coarse, fine, and fine powders of the polysaccharide particles are screened for the first time through a coarse powder mesh filter 6. This allows the coarse powder to remain above the coarse powder mesh filter 6, while the fine and fine powders can pass through the coarse powder mesh filter 6 and remain below it and at the bottom of the batching tank. The ethanol containing the fine and fine powders is then transported from the discharge port 124 of batching tank 1 through the batching delivery pipe 7 to the feed port 114 of batching tank 2 2, and finally into batching tank 2 2. The overflowed liquid flows back through the overflow port of batching tank 2 2 through the batching delivery pipe 7 to the feed port 114 of batching tank 1. This cycle continues multiple times, and the coarse powder screening process continues.

[0056] Step 5: Screening the fine powder and fine powder. Within the second batching tank (2), the fine powder and fine powder of the polysaccharide granules are screened a second time through a fine powder mesh filter (8). The fine powder is retained above the fine powder mesh filter (8), while the fine powder passes through the fine powder mesh filter (8) and remains below it and at the bottom of the second batching tank (2).

[0057] Step 6: Collect the fine powder, coarse powder and fine powder after screening. Turn on the second circulation pump 5, and transport the fine powder on the fine powder mesh filter 8 of the batching tank 22 together with the solution to the suction filtration tank 1 91, turn on the third circulation pump 92, and transport the coarse powder on the coarse powder mesh filter 6 of the batching tank 11 together with the solution to the suction filtration tank 2 93, and filter out the solvent in the suction filtration tank 1 91, the suction filtration tank 2 93 and the batching tank 2 2. Finally, the filtered fine powder, coarse powder and bottom sediment (fine powder) are packaged separately. Starch polysaccharides are screened through this embodiment. The screening effect is shown in the following Table 1: Particle size distribution chart of starch polysaccharides after screening.

[0058] Table 1

[0059]

[0060] Example 2

[0061] Refer to the attached Figure 6 The present invention further includes a third filtration tank 95 connected to the second batching tank 2 via a fourth circulation pump 94. One end of the fourth circulation pump 94 is connected to the discharge port 124 at the bottom of the second batching tank 2, and the other end is connected to the feed port 114 above the third filtration tank 95. The remaining technical features are the same as those of Example 1.

[0062] The specific usage includes the following steps:

[0063] Step 1: Clean the batching tanks of the screening device. Open the cleaning port 115 and overflow port 122 of batching tank 1 and batching tank 2, close other pipe connections, and inject purified water from the cleaning port 115 of both batching tanks. When it reaches the sprayer 116 below the cleaning port 115, it will be sprayed all over the tank bodies of batching tank 1 and batching tank 2 through the sprayer 116. At the same time, turn on the power of the explosion-proof variable frequency motor 31 of the stirring system, causing the stirring blades 33 to start rotating to stir and clean. After water flows out of the overflow port 122, close the cleaning port 115 and stop injecting purified water. After cleaning for about 10 minutes, open the discharge port 124 at the bottom of batching tank 2 and drain the cleaning wastewater. Repeat this operation three times to complete the cleaning, and turn off the power of the explosion-proof variable frequency motor 31.

[0064] Step 2: Drain the residual liquid in the batching tank 1. Close the batching tank and all interfaces of the batching tank except the discharge port 124, start the first circulation pump 4, drain the residual liquid in the batching tank, and then close the discharge port 124 at the bottom of the batching tank.

[0065] Step 3: Add the material to be screened. Open the overflow port 122, quick-open hand hole 112, and discharge port 124 of batching tank 1. Simultaneously, open the first circulation pump 4 and the feed port 114 and overflow port 122 of batching tank 2. Inject anhydrous ethanol into the overflow port 122 of batching tank 1 through the quick-open hand hole 112 until the alcohol begins to overflow. Add polysaccharide particles (such as starch, sodium carboxymethyl starch, chitosan, chitosan, sodium carboxymethyl cellulose, etc.) and the material to be screened. Turn on the explosion-proof variable frequency motor 31 of the stirring system on batching tank 1 and batching tank 2, and stir for 20-60 minutes to achieve a balanced dispersion.

[0066] Step 4: Screening the coarse powder. Within the barrel of batching tank 1, the coarse, fine, and fine powders of the polysaccharide particles are screened for the first time through a coarse powder mesh filter 6. The coarse powder is retained above the coarse powder mesh filter 6, while the fine and fine powders can pass through the coarse powder mesh filter 6 and remain below it and at the bottom of the batching tank. Subsequently, the ethanol containing the fine and fine powders is transported from the discharge port 124 of batching tank 1 through the batching delivery pipe 7 to the feed port 114 of batching tank 2 2, and finally to the barrel of batching tank 2 2. The overflowed liquid flows back through the overflow port of batching tank 2 2 through the batching delivery pipe 7 to the feed port 114 of batching tank 1. This cycle is repeated multiple times to continuously perform the coarse powder screening process.

[0067] Step 5: Screening the fine powder and fine powder. Within the cylinder of the second batching tank 2, the fine powder and fine powder of the polysaccharide granules are screened twice through a fine powder mesh filter 8. The fine powder is retained above the fine powder mesh filter 8, while the fine powder can pass through the fine powder mesh filter 8 and be retained below it and at the bottom of the second batching tank 2.

[0068] Step 6: Collect the fine powder, coarse powder, and fine powder after screening. Turn on the second circulation pump 5 to transport the fine powder on the fine powder mesh filter 8 of the batching tank 22 together with the solution to the suction filtration tank 1 91. Turn on the third circulation pump 92 to transport the coarse powder on the coarse powder mesh filter 6 of the batching tank 11 together with the solution to the suction filtration tank 2 93. Turn on the fourth circulation pump 94 to transport the fine powder under the fine powder mesh filter 8 of the batching tank 22 together with the solution to the suction filtration tank 3 95. Filter out the solvent in the suction filtration tank 1 91, the suction filtration tank 2 93, the suction filtration tank 3 95, and the batching tank 2 2. Finally, the filtered fine powder, coarse powder, and fine powder are packaged separately.

[0069] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A circulating continuous polysaccharide granule wet screening device, characterized in that: The invention comprises a first dosing tank, a second dosing tank connected to the first dosing tank through a first circulation pump, a first filtration tank connected to the second dosing tank through a second circulation pump, and a second filtration tank connected to the first dosing tank through a third circulation pump. The overflow port opened on the side wall of the second dosing tank is higher than the feed port of the first dosing tank. The first dosing tank is provided with a coarse powder mesh filter, the second dosing tank is provided with a fine powder mesh filter, and both the first and second dosing tanks are provided with a stirring device; one end of the first circulation pump is connected to the discharge port at the bottom of the first dosing tank, and the other end is connected to the feed port opened above the second dosing tank, one end of the second circulation pump is connected to the suction port opened above the second dosing tank, and the other end is connected to the feed port above the first filtration tank, and one end of the third circulation pump is connected to the suction port opened above the first dosing tank, and the other end is connected to the feed port above the second filtration tank.

2. The circulating continuous polysaccharide granule wet screening device according to claim 1, characterized in that: It also includes a suction filtration tank three connected to the feed tank two through a fourth circulation pump, one end of the fourth circulation pump is connected to the discharge port at the bottom of the feed tank two, and the other end is connected to the feed port above the suction filtration tank three.

3. The circulating continuous polysaccharide granule wet screening device according to claim 2, characterized in that: The stirring device includes an explosion-proof variable frequency motor, a detachable hook-type stirring shaft connected to the explosion-proof variable frequency motor, and a stirring fan connected to the lower end of the stirring shaft. The stirring fan is 10 to 30 cm above the mesh filter to ensure that the polysaccharide particles can be fully stirred and will not settle on the surface of the mesh filter.

4. The circulating continuous polysaccharide granule wet screening device according to claim 3, characterized in that: The suction port is connected to a suction pipe arranged in the batching tank body. One end of the suction pipe is the suction port, and the other end is located above the mesh filter and close to the mesh filter.

5. The circulating continuous polysaccharide granule wet screening device according to claim 1, 2, 3 or 4, characterized in that: A cleaning port and a quick-open hand hole are also provided above the first and second batching tanks, and the cleaning port is connected to the sprayer arranged in the first and second batching tanks.

6. The circulating continuous polysaccharide granule wet screening device according to claim 5, characterized in that: The pore size of the coarse powder mesh filter is 100-250 meshes, and the pore size of the fine powder mesh filter is 250-350 meshes.

7. A method for wet screening of polysaccharide particles using a circulating continuous polysaccharide particle wet screening device according to claim 1, 2, 3, 4 or 6, characterized in that: The steps include: 1) Clean batching tank 1 and batching tank 2; open the cleaning port and overflow port of batching tank 1 and batching tank 2, close other pipe interfaces, inject purified water from the cleaning port, and when it reaches the sprayer below the cleaning port, spray it in the tank body in all directions through the sprayer. At the same time, turn on the power supply of the explosion-proof variable frequency motor of the stirring device to make the stirring fan blade start to rotate for stirring and cleaning. After water flows out of the overflow port, close the cleaning port and stop injecting purified water. After cleaning, open the discharge port at the bottom of batching tank 2 and drain the cleaning waste water. Repeat the operation three times to complete the cleaning and turn off the power supply of the explosion-proof variable frequency motor. 2) Drain the residual liquid in the batching tank 1; close the batching tank 1 and all interfaces of the batching tank 1 except the discharge port, start the first circulation pump, drain the residual liquid in the batching tank 1, and then close the discharge port at the bottom of the batching tank 1; 3) Add the material to be screened; open the overflow port, quick-open hand hole and discharge port of batching tank one, and at the same time open the first circulation pump and the feed port and overflow port of batching tank two, inject anhydrous ethanol into the overflow port of batching tank one through the quick-open hand hole until alcohol begins to overflow, add the polysaccharide particles to be screened, turn on the explosion-proof variable frequency motor power supply of the stirring device on batching tank one and batching tank two, and stir for 20-60 minutes to ensure uniform dispersion; 4) Screening the coarse powder; in the batching tank 1, the coarse powder, fine powder and fine powder of the polysaccharide particles are screened for the first time through the coarse powder mesh filter, so that the coarse powder is retained above the coarse powder mesh filter, while the fine powder and fine powder pass through the coarse powder mesh filter and are retained below it and at the bottom of the batching tank 1. Subsequently, the ethanol containing the fine powder and fine powder is transported from the discharge port of the batching tank 1 through the batching conveying pipe to the feed port of the batching tank 2, and finally transported to the batching tank 2. The overflowed liquid is returned to the feed port of the batching tank 1 through the batching conveying pipe through the overflow port of the batching tank 2. The cycle is repeated multiple times to continuously perform the coarse powder screening process; 5) Sieving the fine powder and the fine powder; in the second batching tank, the fine powder and the fine powder of the polysaccharide granules are screened twice through a fine powder mesh filter, so that the fine powder is retained above the fine powder mesh filter, and the fine powder passes through the fine powder mesh filter and is retained below it and at the bottom of the second batching tank; 6) Collect the sieved fine powder, coarse powder and fine powder; turn on the second circulation pump to transport the fine powder on the fine powder mesh filter of the second batching tank together with the solution to the filtration tank one, turn on the third circulation pump, and transport the coarse powder on the coarse powder mesh filter of the first batching tank together with the solution to the filtration tank two, turn on the fourth circulation pump, and transport the fine powder under the fine powder mesh filter of the second batching tank together with the solution to the filtration tank three, filter out the solvent in the filtration tank one, the filtration tank two and the filtration tank three, and finally, respectively package the filtered fine powder, coarse powder and fine powder.

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