Dendrobium polysaccharide purity extraction device and process thereof

Abstract

The present application relates to the technical field of Dendrobium polysaccharide extraction, in particular to a Dendrobium polysaccharide purity extraction device and process, which comprises a support frame for stable placement, and a pretreatment chamber, an extraction tank, a vacuum concentration tank and a temporary storage tank are sequentially installed in the support frame from left to right, and the temporary storage tank is installed below the right side of the condenser, the pipeline below the pretreatment chamber is connected with a spiral conveying mechanism, and the top of the spiral conveying mechanism is connected with the feed inlet at the top end of the extraction tank. The Dendrobium polysaccharide purity extraction device and process can rotate the placement frame by 180°, so that the positions of the upper and lower filter plates can be replaced, the accumulation of Dendrobium residues on one side of the filter plate is avoided, and the filtration efficiency and quality in the later stage are affected, so that the purity and extraction efficiency of Dendrobium polysaccharide extraction in the later stage can be improved, and the demand for Dendrobium polysaccharide purity in the high field of medicine and biotechnology can be met.

Description

Technical Field

[0001] This invention relates to the field of Dendrobium polysaccharide extraction technology, specifically to a device and process for extracting pure Dendrobium polysaccharides. Background Technology

[0002] Dendrobium officinale contains a variety of medicinal components such as polysaccharides, alkaloids, and amino acids. Polysaccharides are an important active ingredient in Dendrobium officinale, and they are present in high amounts. The main effects of polysaccharides include anti-aging, anti-cancer, immune enhancement, and blood sugar reduction. They are widely used in the fields of medicine, food, biology, and health. Therefore, it is necessary to use an extraction device to extract Dendrobium officinale polysaccharides to obtain high-purity Dendrobium officinale polysaccharides. The prior art, disclosed in patent publication number "CN209428437U" entitled "A Micro-pulverization Extraction Device for Dendrobium officinale Polysaccharides," discloses a mixing device equipped with a stirring device to accelerate the mixing speed of Dendrobium officinale and the extract, ensuring sufficient contact between the extract and the Dendrobium officinale and thus speeding up the extraction process. An ultrasonic device is also included to sonicate the homogenized mixture, further facilitating the release of polysaccharides from the Dendrobium officinale and improving extraction efficiency. After ultrasonication, a multi-layer first filter screen is installed to filter the extracted mixture, removing impurities. The entire device is simple in structure, ingeniously designed, and convenient, effectively and rapidly improving the extraction efficiency of Dendrobium officinale. For example, in the prior art, the patent entitled "An Extraction Device for Dendrobium Polysaccharides" disclosed in the publication number "CN215365557U" discloses that the Dendrobium extract in the extraction tank is drawn into the concentration tank for concentration treatment. The filter screen on the inside of the outlet can filter the Dendrobium residue produced during extraction to ensure that the Dendrobium extract drawn into the concentration tank for concentration is free of residue. After concentration, the controller starts to control the air diaphragm pump between the concentration tank and the hydrolysis tank to draw the Dendrobium concentrate into the hydrolysis tank for hydrolysis. After hydrolysis, the controller starts to control the air diaphragm pump between the hydrolysis tank and the crystallization tank to draw the Dendrobium hydrolysate into the crystallization tank for evaporation and crystallization, finally obtaining solid Dendrobium polysaccharides.

[0003] The existing Dendrobium polysaccharide extraction device uses a filter screen to filter the extracted Dendrobium residue. After a period of filtration, a large amount of Dendrobium residue accumulates on one side of the filter screen, affecting the filtration efficiency and quality. This, in turn, affects the purity and extraction efficiency of the Dendrobium polysaccharide, failing to meet the purity requirements of high-end pharmaceutical and biotechnology applications. Furthermore, the entire extraction device must be shut down before the accumulated Dendrobium residue on one side of the filter screen can be cleaned, making the operation cumbersome and prolonging the extraction time. Therefore, we propose a Dendrobium polysaccharide extraction device and its process to solve the aforementioned problems. Summary of the Invention

[0004] The purpose of this invention is to provide a device and process for extracting Dendrobium polysaccharides to achieve high purity. This addresses the problem that current Dendrobium polysaccharide extraction devices on the market, as mentioned in the background, rely on a filter screen to remove the extracted Dendrobium residue. After a period of filtration, a significant amount of residue accumulates on one side of the screen, affecting the filtration efficiency and quality. This, in turn, impacts the purity and extraction efficiency of the extracted Dendrobium polysaccharides, failing to meet the purity requirements of high-end pharmaceutical and biotechnology fields. Furthermore, the entire extraction device must be shut down before cleaning the accumulated residue, resulting in cumbersome operation and prolonged extraction time.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a Dendrobium polysaccharide purity extraction device, comprising a support frame for stable placement, wherein a pretreatment chamber, an extraction tank, a vacuum concentration tank, and a temporary storage tank are sequentially installed from left to right inside the support frame; a controller is installed on the upper front side of the support frame; the upper part of the vacuum concentration tank is connected to a condenser located at the top of the support frame via a connecting pipe; a temporary storage tank is installed on the lower right side of the condenser; a pipe below the pretreatment chamber is connected to a screw conveyor mechanism; the upper part of the screw conveyor mechanism is connected to the feed inlet at the top of the extraction tank; a pipe at the bottom of the extraction tank is connected to a separation frame located inside the lower part of the support frame; a placement frame is tightly fitted inside the separation frame; and filter plates are sealed and fitted in the grooves opened inside the upper and lower parts of the placement frame through an installation structure.

[0006] Preferably, a crushing roller is installed inside the pretreatment chamber, and a screening plate is slidably connected inside the pretreatment chamber located below the crushing roller.

[0007] Preferably, a heating chamber is installed on the outside of the extraction tank, and a stirring assembly is rotatably connected inside the extraction tank.

[0008] Preferably, a feed pipe is installed through the left side of the separation frame, with the lowest point of the feed pipe being higher than the highest point of the filter plate above. The left end of the feed pipe is connected to the pipe at the bottom of the extraction tank. Two drain pipes are symmetrically installed through the right side of the separation frame. The lower drain pipe is connected to an external water supply mechanism, and the right end of the upper drain pipe is connected to the inlet of a water pump installed inside the support frame. The outlet of the water pump is connected to a vacuum concentration tank through a pipe.

[0009] Preferably, a rotating rod is horizontally installed inside the middle of the placement frame, and the left end of the rotating rod is rotatably connected through the left side of the separation frame.

[0010] Preferably, the left side of the placement frame has two symmetrically opened feed holes, and the right side of the placement frame has two symmetrically opened drain holes. The left side of the upper feed hole is connected to the feed pipe, and the right side of the upper drain hole is connected to the left end of the upper drain pipe. The shortest distance between the drain hole and the center of the placement frame is less than the shortest distance between the filter plate and the center of the placement frame.

[0011] Preferably, the mounting structure includes screws, and the filter plate is mounted inside the placement frame.

[0012] Preferably, the separating frame is a hollow cylindrical shape with openings at both the top and bottom. An upper fixing frame is installed above the upper opening of the separating frame, and a lower fixing frame is installed below the lower opening of the separating frame. An electric push rod is fixed through the upper surface of the upper fixing frame, and the output end of the electric push rod is connected to an extrusion plate located inside the upper fixing frame. The outer side of the extrusion plate is in convex-concave fit with a groove opened inside the upper part of the placement frame. The lower surface of the extrusion plate is arc-shaped, and the extension line of the arc of the lower surface of the extrusion plate coincides with the outer side of the placement frame.

[0013] Preferably, the installation structure includes sliders installed on the left and right sides of the filter plate, and the outer side of the slider is engaged and slidably connected with the groove opened in the inner side wall of the placement frame. A reset spring connected to the slider is installed in the groove, and the upper and lower filter plates are connected by a connecting vertical rod, which passes through and is slidably connected inside the placement frame.

[0014] Another technical solution provided by the present invention is a process for extracting pure Dendrobium polysaccharides, comprising the following steps: S1: The Dendrobium raw material, after impurities have been removed and it has been cleaned and dried, is transported to the pretreatment chamber for crushing and filtration. S2: Then, the crushed and filtered Dendrobium raw material in the pretreatment chamber is transported to the extraction tank by the screw conveyor mechanism. The motor at the top of the extraction tank drives the built-in stirring component to rotate, so that the Dendrobium raw material and the extract can fully contact each other, greatly accelerating the dissolution efficiency of polysaccharides. S3: The mixture enters the separation frame and is filtered by the filter plate above. At the same time, the reciprocating lifting of the extrusion plate reciprocates to extrude the material on the filter plate above, which can further improve the efficiency and effect of solid and liquid separation. S4: When a certain amount of Dendrobium residue accumulates on the surface of the upper filter plate after filtering for a period of time, the placement frame is rotated by rotating the rod to change the position of the upper and lower filter plates. This avoids the accumulation of too much Dendrobium residue on one side of the upper filter plate, which would affect the later filtration efficiency and filtration quality. Therefore, it can improve the purity and extraction efficiency of Dendrobium polysaccharide extraction in the later stage. S5: While the upper filter plate is performing the filtration operation, the lower filter plate can be cleaned without stopping the entire extraction device. S6: The filtered liquid enters the vacuum concentration tank through the water pump. The high-concentration Dendrobium polysaccharide paste after concentration can be directly discharged and collected from the bottom outlet of the vacuum concentration tank. The water vapor emitted from the vacuum concentration tank enters the condenser 7 through the connecting pipe for condensation treatment.

[0015] Compared with the prior art, the beneficial effects of the present invention are: the Dendrobium polysaccharide purity extraction device and its process facilitate the replacement of the positions of the upper and lower filter plates, avoiding the accumulation of excessive Dendrobium residue on one side of the filter plate, which affects the subsequent filtration efficiency and filtration quality. Therefore, it can improve the purity and extraction efficiency of Dendrobium polysaccharide extraction in the later stage. The specific details are as follows: (1) The placement frame is rotated 180° by rotating the rod, which makes it easy to replace the position of the upper and lower filter plates. This avoids the accumulation of a lot of Dendrobium residue on one side of the filter plate, which affects the later filtration efficiency and filtration quality. Therefore, it can improve the purity and extraction efficiency of Dendrobium polysaccharide extraction in the later stage, and can meet the requirements of high-end medicine and biotechnology for the purity of Dendrobium polysaccharide. Furthermore, by connecting the drain pipe below to an external water supply system, the external water flushes the filter plate below, allowing the Dendrobium residue accumulated on one side of the filter plate to fall into the lower fixed frame for collection. Therefore, the extraction operation can be carried out while the filter plate is being cleaned, without having to shut down the entire extraction device, thus further improving the efficiency of Dendrobium polysaccharide extraction.

[0016] (2) The physical extraction method of hot water immersion uses water as the extractant and does not add any chemical raw materials to Dendrobium. Therefore, the Dendrobium polysaccharide extracted by physical extraction technology has a high purity, which makes Dendrobium polysaccharide reach an unprecedented level in the demand of medicine and biotechnology. At the same time, since it does not use alcohol and does not involve any chemical raw materials, it not only reduces the negative impact on the environment, but also extracts the target substance from the raw material at low cost, reducing production and use costs. (3) By driving the extrusion plate to move up and down in a reciprocating manner through the electric push rod, the extrusion plate can squeeze the material on the filter plate above, thereby improving the material filtration efficiency. (4) The upper filter plate can drive the lower filter plate to swing up and down in a reciprocating motion through the connecting vertical rod, thus further improving the efficiency and effect of cleaning the lower filter plate. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2This is a schematic cross-sectional view of the pretreatment chamber of the present invention; Figure 3 This is a cross-sectional view of the heating chamber and extraction vessel of the present invention; Figure 4 This is a schematic diagram of the rear view of the separation frame structure of the present invention; Figure 5 This is a schematic diagram of the right view of the separation frame structure of the present invention; Figure 6 This is a schematic diagram of the left cross-sectional structure of the separation frame of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the separation frame and placement frame, upper fixing frame and lower fixing frame of the present invention; Figure 8 This is a bottom view of the separation structure of the separation frame and placement frame, upper fixing frame and lower fixing frame of the present invention; Figure 9 This is a schematic cross-sectional view of the placement frame of the present invention; Figure 10 This is a cross-sectional view of the connection between the placement frame and the filter plate in Embodiment 2 of the present invention; Figure 11 For the present invention Figure 10 Enlarged structural diagram at point A in the middle; Figure 12 This is a schematic diagram of the connection structure of the two filter plates in Embodiment 2 of the present invention.

[0018] In the diagram: 1. Support frame; 2. Pretreatment chamber; 201. Crushing roller; 202. Screening plate; 3. Heating chamber; 4. Separation frame; 401. Drain pipe; 402. Feed pipe; 5. Vacuum concentrator; 6. Connecting pipe; 7. Condenser; 8. Temporary storage tank; 9. Controller; 10. Screw conveyor mechanism; 11. Extraction tank; 111. Stirring assembly; 12. Upper fixed frame; 121. Extrusion plate; 122. Electric push rod; 13. Rotating rod; 14. Placement frame; 141. Drain hole; 142. Feed hole; 15. Filter plate; 16. Lower fixed frame; 17. Water pump; 18. Connecting vertical rod; 19. Slider; 20. Return spring. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-12 The present invention provides the following technical solution: Example 1: The Dendrobium polysaccharide extraction device and process in this example facilitate the replacement of the upper filter plate 15 during the extraction process, preventing excessive Dendrobium residue buildup on one side of the upper filter plate 15, which would affect the subsequent filtration efficiency and quality. Therefore, it can improve the purity and extraction efficiency of the Dendrobium polysaccharide, meeting the purity requirements of Dendrobium polysaccharides in high-end pharmaceutical and biotechnology fields. For the specific structure, please refer to the attached diagram. Figures 1-9 As shown, the system includes a support frame 1 for stable placement. Inside the support frame 1, from left to right, are a pretreatment chamber 2, an extraction tank 11, a vacuum concentrator 5, and a temporary storage tank 8. A controller 9 is installed on the upper front side of the support frame 1. The upper part of the vacuum concentrator 5 is connected to a condenser 7 located at the top of the support frame 1 via a connecting pipe 6. The temporary storage tank 8 is installed on the lower right side of the condenser 7. A pipe below the pretreatment chamber 2 is connected to a screw conveyor mechanism 10. The upper part of the screw conveyor mechanism 10 is connected to the feed inlet at the top of the extraction tank 11. A pipe at the bottom of the extraction tank 11 is connected to a separation frame 4 located inside the support frame 1. A placement frame 14 is tightly fitted inside the separation frame 4. Filter plates 15 are sealed and fitted into the grooves opened at the top and bottom of the placement frame 14 using an installation structure. A crushing roller 201 is installed inside the pretreatment chamber 2. A screening plate 202 is slidably connected in the pretreatment chamber 2 below the crushing roller 201. A heating chamber 3 is installed on the outside of the extraction tank 11, and a stirring assembly 111 is rotatably connected inside the extraction tank 11. A feed pipe 402 is installed through the left side of the separation frame 4. The lowest point of the feed pipe 402 is higher than the highest point of the filter plate 15 above. The left end of the feed pipe 402 is connected to the pipe at the bottom of the extraction tank 11. Two drain pipes 401 are symmetrically installed through the right side of the separation frame 4. The lower drain pipe 401 is connected to the external water supply mechanism. The right end of the upper drain pipe 401 is connected to the inlet end of the conveying water pump 17 installed inside the support frame 1. The discharge end of the conveying water pump 17 is connected to the vacuum concentration tank 5 through a pipe. A rotating rod 13 is installed horizontally in the middle of the placement frame 14, and the left end of the rotating rod 13 is rotatably connected through the left side of the separation frame 4.

[0021] Two feed holes 142 are symmetrically opened on the left side of the placement frame 14, and two drain holes 141 are symmetrically opened on the right side of the placement frame 14. The left side of the upper feed hole 142 is connected to the feed pipe 402, and the right side of the upper drain hole 141 is connected to the left end of the upper drain pipe 401. The shortest distance between the drain hole 141 and the center of the placement frame 14 is less than the shortest distance between the filter plate 15 and the center of the placement frame 14. The mounting structure includes screws. The filter plate 15 is installed inside the placement frame 14. The separation frame 4 is a hollow cylindrical shape. The upper and lower parts of the separation frame 4 are both open. An upper fixed frame 12 is installed above the upper opening of the separation frame 4, and a lower fixed frame 16 is installed below the lower opening of the separation frame 4. An electric push rod 122 is fixed through the upper surface of the upper fixed frame 12, and the output end of the electric push rod 122 is connected to the extrusion plate 121 located inside the upper fixed frame 12. The outer side of the extrusion plate 121 is in concave-convex fit with the groove opened inside the upper part of the placement frame 14. The lower surface of the extrusion plate 121 is arc-shaped, and the extension line of the arc of the lower surface of the extrusion plate 121 coincides with the outer side of the placement frame 14.

[0022] First, the Dendrobium officinale raw material, after impurities have been removed and it has been cleaned and dried, is conveyed through the feed inlet at the top of the pretreatment chamber 2 to the space between two crushing rollers 201 inside. Then, a motor on the outside of the pretreatment chamber 2 drives the two crushing rollers 201 to rotate in opposite directions. The rotation of the crushing rollers 201 crushes the Dendrobium officinale raw material, while simultaneously filtering it through a screening plate 202 to improve the extraction efficiency in the later stages. Next, the crushed and filtered Dendrobium officinale raw material enters the screw conveyor mechanism 10 through a pipe at the bottom of the pretreatment chamber 2, and is then conveyed by the screw conveyor mechanism 10... The crushed and filtered Dendrobium raw material is transported to the feed inlet at the top of the extraction tank 11, allowing it to enter the tank from the top. At this point, warm water or low-pressure steam can be introduced into the heating chamber 3 for indirect heating. The motor at the top of the extraction tank 11 drives the built-in stirring component 111 to rotate, while the aqueous extract is transported into the tank from another feed inlet at the top of the extraction tank 11, allowing the Dendrobium raw material to come into full contact with the extract and significantly accelerating the dissolution efficiency of polysaccharides. Since this part is existing technology, it will not be described in detail here.

[0023] After a period of extraction, the delivery water pump 17 is started, allowing the mixture in the extraction tank 11 to enter the upper part of the placement frame 14 through the bottom pipe, the overlapping feed pipe 402, and the upper feed hole 142. At this time, the filter plate 15 in the upper part of the placement frame 14 filters the mixture, and the filtered liquid flows through the upper drain hole 141 into the drain pipe 401. Then, the delivery water pump 17 delivers the filtered liquid to the vacuum concentration tank 5, leaving the Dendrobium residue on the upper filter plate 15. Under the action of the vacuum pump, the vacuum concentration tank 5... Maintaining a negative pressure environment of -0.08 to -0.09 MPa allows the liquid to boil and evaporate water at a low temperature of 45 to 70°C. The high-concentration Dendrobium polysaccharide paste after concentration can be directly discharged and collected from the bottom outlet of the vacuum concentration tank 5. The water vapor emitted from the vacuum concentration tank 5 enters the condenser 7 through the connecting pipe 6 for condensation treatment. It is then collected through the temporary storage tank 8 and can be reused directly as a solvent for the next batch of Dendrobium extraction, which greatly reduces the cost of solvent consumption. Since this part is existing technology, it will not be described in detail here.

[0024] When the upper filter plate 15 is filtering, the electric push rod 122 is activated. The output end of the electric push rod 122 drives the extrusion plate 121 to reciprocate up and down, thereby causing the extrusion plate 121 to reciprocate and extrude the material on the upper filter plate 15, which can further improve the efficiency and effect of solid and liquid separation. When a certain amount of Dendrobium residue accumulates on the surface of the filter plate 15 after filtering for a period of time, the left end of the rotating rod 13 is connected to an external motor through a coupling. The motor drives the rotating rod 13 to rotate 180°. At this time, the rotating rod 13 drives the placement frame 14 to rotate 180° inside the separation frame 4. During the rotation process, The bottom surface of the extrusion plate 121 is arc-shaped, allowing the outer side of the placement frame 14 to fit in contact with the arc-shaped surface of the extrusion plate 121. This allows the outer side of the placement frame 14 to scrape off the Dendrobium residue adhering to the bottom surface of the extrusion plate 121 and drop it onto the upper filter plate 15. Then, the upper filter plate 15 rotates to the bottom, and the lower filter plate 15 rotates to the top. This facilitates the replacement of the positions of the upper and lower filter plates 15, preventing excessive Dendrobium residue from accumulating on one side of the upper filter plate 15 and affecting the subsequent filtration efficiency and quality. Therefore, it can improve the purity and extraction efficiency of Dendrobium polysaccharides in the later stages, meeting the purity requirements of Dendrobium polysaccharides in high-end pharmaceutical and biotechnology fields.

[0025] Then, the upper filter plate 15 continues the filtration process. At this time, some of the Dendrobium residue on the lower filter plate 15 falls into the lower fixed frame 16 due to its own gravity. Then, the lower drain pipe 401 can be connected to the external water supply mechanism, so that water enters the lower interior of the separation frame 4 through the lower drain pipe 401 and the lower drain hole 141. The external water washes the lower filter plate 15, so that the Dendrobium residue accumulated on one side of the lower filter plate 15 falls into the lower fixed frame 16 for collection. Therefore, the extraction operation can be carried out while the lower filter plate 15 is being cleaned, so that the cleaned lower filter plate 15 can be rotated to the upper part for use later without stopping the entire extraction device. Therefore, the efficiency of Dendrobium polysaccharide purity extraction can be further improved.

[0026] This application employs a physical extraction method using hot water immersion, with water as the extractant, without adding any chemical raw materials to Dendrobium. Therefore, the Dendrobium polysaccharides extracted through this physical extraction technique have high purity, enabling Dendrobium polysaccharides to reach unprecedented levels of demand in the pharmaceutical and biotechnology fields. Furthermore, since it does not use alcohol or involve any chemical raw materials, it not only reduces the negative impact on the environment but also allows for the low-cost extraction of the target substance from the raw materials, lowering production and usage costs. The entire extraction process is monitored and controlled by controller 9 to ensure the accuracy and stability of the operation.

[0027] This embodiment discloses a process for extracting pure Dendrobium polysaccharides, including the following steps: Step 1: The Dendrobium officinale raw materials, after impurities have been removed and they have been cleaned and dried, are transported to the pretreatment chamber 2 for crushing and filtration. Step 2: Then, the crushed and filtered Dendrobium raw material in the pretreatment chamber 2 is transported to the extraction tank 11 by the screw conveyor 10. The motor at the top of the extraction tank 11 drives the built-in stirring component 111 to rotate, so that the Dendrobium raw material and the extract can fully contact each other, greatly accelerating the dissolution efficiency of polysaccharides. Step 3: The mixture enters the separation frame 4 and is filtered by the filter plate 15 above. At the same time, the reciprocating lifting of the extrusion plate 121 reciprocates the material on the filter plate 15 above, which can further improve the efficiency and effect of solid and liquid separation. Step 4: When a certain amount of Dendrobium residue accumulates on the surface of the upper filter plate 15 after filtering for a period of time, the placement frame 14 is rotated by the rotating rod 13 to change the position of the upper and lower filter plates 15. This avoids the accumulation of too much Dendrobium residue on one side of the upper filter plate 15, which would affect the later filtration efficiency and filtration quality. Therefore, it can improve the purity and extraction efficiency of Dendrobium polysaccharide extraction in the later stage. Step 5: While the upper filter plate 15 is performing the filtration operation, the lower filter plate 15 can be cleaned without stopping the entire extraction device. Step 6: The filtered liquid enters the vacuum concentration tank 5 through the water pump 17. The high-concentration Dendrobium polysaccharide paste after concentration can be directly discharged and collected from the bottom outlet of the vacuum concentration tank 5. The water vapor emitted from the vacuum concentration tank 5 enters the condenser 7 through the connecting pipe 6 for condensation treatment.

[0028] Example 2: The Dendrobium polysaccharide extraction device and process in this example, based on Example 1, discloses another installation structure for the placement frame 14 and the filter plate 15. This allows the upper filter plate 15 to drive the lower filter plate 15 to reciprocate up and down via the connecting vertical rod 18, thus further improving the efficiency and effectiveness of cleaning the lower filter plate 15. For the specific structure, please refer to the attached diagram. Figures 10-12 As shown, the installation structure includes sliders 19 installed on the left and right sides of the filter plate 15, and the outer side of the sliders 19 is engaged and slidably connected with the groove opened in the inner side wall of the placement frame 14. A return spring 20 connected to the sliders 19 is installed in the groove. The upper and lower filter plates 15 are connected by a connecting vertical rod 18, which is slidably connected inside the placement frame 14 through a seal.

[0029] When the extrusion plate 121 reciprocates to extrude the material on the upper filter plate 15, it also causes the upper filter plate 15 to move downward. At this time, the slider 19 on the outer side of the upper filter plate 15 slides in the groove opened in the inner side wall of the placement frame 14, compressing and storing force on the return spring 20. The upper filter plate 15 drives the lower filter plate 15 to descend together through the connecting vertical rod 18. The connecting vertical rod 18 is connected to the interior of the placement frame 14 through a sealing mechanism to prevent liquid leakage. When the extrusion plate 121 moves upward and stops extruding, since the elastic coefficient of the return spring 20 is greater than the sum of the weight of the upper filter plate 15 and the weight of the material above, the return spring 20 causes the upper filter plate 15 to move upward and reset. This operation is repeated, causing the upper and lower filter plates 15 to swing up and down, which can further improve the cleaning efficiency and effect of the lower filter plate 15. Later, the screws connecting the lower fixed frame 16 and the separation frame 4 can be removed to facilitate the discharge and cleaning of impurities in the lower fixed frame 16.

[0030] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A process for extracting pure Dendrobium polysaccharides, characterized in that: The extraction process includes the following steps: S1: The Dendrobium raw material that has been cleaned and dried after removing impurities is transported to the pretreatment chamber (2) for crushing and filtration. S2: Then, the crushed and filtered Dendrobium raw material in the pretreatment chamber (2) is transported to the extraction tank (11) by the screw conveyor (10). The motor at the top of the extraction tank (11) drives the built-in stirring component (111) to rotate, so that the Dendrobium raw material and the extract can fully contact each other, greatly accelerating the dissolution efficiency of polysaccharides. S3: The mixture enters the separation frame (4) and is filtered by the filter plate (15) above. At the same time, the reciprocating lifting of the extrusion plate (121) extrudes the material on the filter plate (15) above, which can further improve the efficiency and effect of solid and liquid separation. S4: When a certain amount of Dendrobium residue accumulates on the surface of the upper filter plate (15) after filtering for a period of time, the placement frame (14) is rotated by the rotating rod (13) to change the position of the upper and lower filter plates (15). This avoids the accumulation of a lot of Dendrobium residue on one side of the upper filter plate (15), which affects the later filtration efficiency and filtration quality. Therefore, it can improve the purity and extraction efficiency of Dendrobium polysaccharide extraction in the later stage. S5: While the upper filter plate (15) is performing filtration, the lower filter plate (15) can be cleaned without shutting down the entire extraction device. S6: The filtered liquid enters the vacuum concentrator (5) through the water pump (17). The high-concentration Dendrobium polysaccharide paste after concentration can be directly discharged and collected from the bottom outlet of the vacuum concentrator (5). The water vapor emitted from the vacuum concentrator (5) enters the condenser (7) through the connecting pipe (6) for condensation treatment.

2. A device for extracting pure Dendrobium polysaccharides, comprising a support frame (1) for stable placement, wherein a pretreatment chamber (2), an extraction tank (11), a vacuum concentration tank (5), and a temporary storage tank (8) are sequentially installed from left to right inside the support frame (1), and a controller (9) is installed on the upper front side of the support frame (1), characterized in that: The vacuum concentrator (5) is connected to the condenser (7) at the top of the support frame (1) via a connecting pipe (6), and a temporary storage tank (8) is installed on the lower right side of the condenser (7). The pipe below the pretreatment chamber (2) is connected to the screw conveyor (10), and the upper part of the screw conveyor (10) is connected to the feed inlet at the top of the extraction tank (11). The pipe at the bottom of the extraction tank (11) is connected to the separation frame (4) located inside the support frame (1), and a placement frame (14) is tightly fitted inside the separation frame (4). Filter plates (15) are installed in the grooves opened at the top and bottom of the placement frame (14) through a sealing installation structure.

3. The device for extracting pure Dendrobium polysaccharides according to claim 2, characterized in that: The pretreatment chamber (2) is equipped with a crushing roller (201), and a screening plate (202) is slidably connected in the pretreatment chamber (2) below the crushing roller (201).

4. The device for extracting pure Dendrobium polysaccharides according to claim 2, characterized in that: A heating chamber (3) is installed on the outside of the extraction tank (11), and a stirring assembly (111) is rotatably connected inside the extraction tank (11).

5. The device for extracting pure Dendrobium polysaccharides according to claim 2, characterized in that: A feed pipe (402) is installed through the left side of the separation frame (4). The lowest point of the feed pipe (402) is higher than the highest point of the filter plate (15) above. The left end of the feed pipe (402) is connected to the pipe at the bottom of the extraction tank (11). Two drain pipes (401) are symmetrically installed through the right side of the separation frame (4). The lower drain pipe (401) is connected to the external water supply mechanism. The right end of the upper drain pipe (401) is connected to the inlet end of the conveying water pump (17) installed inside the support frame (1). The discharge end of the conveying water pump (17) is connected to the vacuum concentration tank (5) through a pipe.

6. The device for extracting pure Dendrobium polysaccharides according to claim 2, characterized in that: A rotating rod (13) is horizontally installed in the middle of the placement frame (14), and the left end of the rotating rod (13) is rotatably connected to the left side of the separation frame (4).

7. The device for extracting pure Dendrobium polysaccharides according to claim 5, characterized in that: The left side of the placement frame (14) has two symmetrical feed holes (142), and the right side of the placement frame (14) has two symmetrical drain holes (141). The left side of the upper feed hole (142) is connected to the feed pipe (402), and the right side of the upper drain hole (141) is connected to the left end of the upper drain pipe (401). The shortest distance between the drain hole (141) and the center of the placement frame (14) is less than the shortest distance between the filter plate (15) and the center of the placement frame (14).

8. The device for extracting pure Dendrobium polysaccharides according to claim 2, characterized in that: The mounting structure includes screws, and the filter plate (15) is mounted inside the placement frame (14).

9. The device for extracting pure Dendrobium polysaccharides according to claim 2, characterized in that: The separation frame (4) is a hollow cylindrical shape with openings at both the top and bottom. An upper fixed frame (12) is installed above the opening at the top of the separation frame (4), and a lower fixed frame (16) is installed below the opening at the bottom of the separation frame (4). An electric push rod (122) is fixed through the upper surface of the upper fixed frame (12), and the output end of the electric push rod (122) is connected to the extrusion plate (121) located in the upper fixed frame (12). The outer side of the extrusion plate (121) is in convex-concave fit with the groove opened inside the upper part of the placement frame (14). The lower surface of the extrusion plate (121) is arc-shaped, and the extension line of the arc on the lower surface of the extrusion plate (121) coincides with the outer side of the placement frame (14).

10. The device for extracting pure Dendrobium polysaccharides according to claim 2, characterized in that: The installation structure includes sliders (19) installed on the left and right sides of the filter plate (15), and the outer side of the slider (19) is engaged and slidably connected with the groove opened on the inner side wall of the placement frame (14). A reset spring (20) connected to the slider (19) is installed in the groove. The upper and lower filter plates (15) are connected by a connecting vertical rod (18), and the connecting vertical rod (18) is slidably connected through the inside of the placement frame (14).

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