Low-temperature continuous extraction process of low-molecular-weight water chestnut polysaccharide and special equipment

Abstract

The invention relates to the technical field of low-temperature extraction equipment, and discloses special low-temperature continuous extraction equipment for low-molecular-weight water chestnut polysaccharide, which comprises a tank body, a rotating rod is arranged in the tank body, the upper end of the rotating rod is rotatably connected with the top wall of the tank body, and the outside of the rotating rod is rotatably connected with a stirring rod; stirring blades are fixedly connected to the exterior of the stirring rod, a first cavity is formed in the rotating rod, and the angle of the stirring blades is adjusted through cooperation of an adjusting grip, a driving rod, a first bevel gear, a second bevel gear, the stirring rod and other structures, so that the stirring mode and the stirring strength of the stirring device are conveniently adjusted according to actual stirring requirements; the angle of the stirring blades is increased, so that the stirring blades can generate stronger axial and radial flow, material circulation is pushed, non-uniform local concentration is avoided, for low-viscosity materials, the mixing requirement can be met through the small stirring blade angle, meanwhile, energy consumption can be reduced, and practicability and flexibility are high.

Description

Technical Field

[0001] The invention relates to the technical field of low-temperature extraction equipment, in particular to a low-temperature continuous extraction process and special equipment for low-molecular-weight water chestnut polysaccharide. Background Art

[0002] Low-molecular-weight water chestnut polysaccharides are polysaccharides composed of multiple monosaccharide molecules linked by glycosidic bonds. However, their molecular weight is relatively low and they are typically obtained by degrading natural water chestnut polysaccharides. The main monosaccharides that make up low-molecular-weight water chestnut polysaccharides include rhamnose, arabinose, xylose, mannose, glucose, and galactose. These monosaccharides form polysaccharide chains in specific proportions and linkages, and their specific structure varies depending on the extraction source and method.

[0003] Existing low-temperature continuous extraction equipment for low-molecular-weight water chestnut polysaccharides typically consists of a tank, a jacket, a stirring device, a control system, and an inlet and outlet. A low-temperature medium, such as cold water, low-temperature brine, or other refrigerant, can be introduced into the jacket. Heat exchange controls the temperature inside the tank, maintaining a low temperature. The stirring device thoroughly mixes the material and the extraction solvent, accelerating the dissolution and diffusion of components such as polysaccharides and improving extraction efficiency. However, the stirring blades of existing stirring devices are typically fixed at a fixed angle, and the stirring requirements vary at different extraction stages. In the early stages of extraction, a larger stirring blade angle allows for rapid and uniform mixing of the material and solvent, accelerating the solvent's infiltration of the material and the dissolution of the target components. As the extraction process progresses, in order to avoid excessive agitation that damages the extracted components, or to promote subsequent separation processes such as crystallization and precipitation of certain components, it is necessary to timely reduce the angle of the stirring blade and reduce the stirring intensity. For high-viscosity materials, a larger-angle stirring blade can produce stronger axial flow, promote the overall flow of the material, prevent the material from adhering to the tank wall or the stirring shaft, and achieve uniform mixing; while for low-viscosity materials, a smaller-angle stirring blade can meet the mixing requirements while avoiding excessive agitation that causes energy waste and material splashing. For materials with higher density, appropriately increasing the stirring blade angle can enhance the stirring up and down circulation capacity and prevent material sedimentation and accumulation; for materials with smaller particle size, reducing the stirring blade angle can avoid excessive crushing or agglomeration. However, existing extraction equipment is not easy to adjust the stirring blade angle, which leads to significant limitations during use. In view of this, we propose a low-temperature continuous extraction process and dedicated equipment for low-molecular-weight water chestnut polysaccharides to solve the above problems. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a low-temperature continuous extraction process and special equipment for low-molecular-weight water chestnut polysaccharides to solve the problem that some existing low-temperature continuous extraction equipment for low-molecular-weight water chestnut polysaccharides has large limitations.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a special equipment for low-temperature continuous extraction of low-molecular weight water chestnut polysaccharides, comprising a tank body, a rotating rod is provided inside the tank body, the upper end of the rotating rod is rotatably connected to the top wall of the tank body, the outside of the rotating rod is rotatably connected to a stirring rod, the outside of the stirring rod is fixedly connected to a stirring blade, a first cavity is opened inside the rotating rod, the stirring rod rotates and passes through the inside of the first cavity, the inside of the first cavity is rotatably connected to a driving rod, the outside of the driving rod is fixedly sleeved with a first bevel gear, one end of the stirring rod located inside the first cavity is fixedly sleeved with a second bevel gear, the adjacent first bevel gear and the second bevel gear are meshed and connected, a driving assembly is provided on the upper surface of the tank body, the upper end of the rotating rod rotates and passes through the upper surface of the tank body, the upper end of the driving rod rotates and passes through the upper surface of the rotating rod, an adjusting assembly is provided on the outside of the driving rod, a feed port is provided on the upper surface of the tank body, and a discharge port is provided at the lower end of the tank body.

[0006] Preferably, the drive assembly includes a motor, which is fixedly connected to the upper surface of the tank body, a second cavity is opened inside the top plate of the tank body, a support shaft is rotatably connected inside the second cavity, the output shaft of the motor rotates and passes through the interior of the second cavity, the output shaft of the motor is fixedly connected to the support shaft through a coupling, the outer fixed sleeve of the support shaft is provided with a first gear, and one end of the rotating rod located inside the second cavity is fixedly provided with a second gear, and the first gear and the second gear are meshed and connected.

[0007] Preferably, the adjustment component includes an adjustment handle, which is slidably sleeved on the outside of the driving rod, and a third cavity is opened inside the adjustment handle. The upper end of the driving rod slides into the interior of the third cavity, and a synchronization component is provided at one end of the driving rod located inside the third cavity. The surface of the adjustment handle is provided with an anti-slip groove.

[0008] Preferably, the synchronization assembly includes a circular plate, which is fixedly connected to the driving rod, and two synchronization blocks are fixedly connected to the surface of the circular plate. Two synchronization grooves are opened on the inner wall of the third cavity, and the synchronization blocks are slidably connected inside the synchronization grooves. A spring is fixedly connected between the lower surface of the circular plate and the bottom wall of the third cavity, and the spring is movably sleeved on the outside of the driving rod.

[0009] Preferably, a groove is provided on the lower surface of the adjustment handle, and the adjustment handle is sleeved on the outside of the rotating rod through the groove. The inner wall of the groove is fixedly connected with a first tooth, and the outer surface of the rotating rod is fixedly connected with a second tooth, and the first tooth and the second tooth are engaged.

[0010] Preferably, an annular chamber is opened inside the side wall of the tank body, and a spiral pipe is fixedly installed on the inner wall of the annular chamber. Both ends of the spiral pipe pass through the interior of the tank body, and the two ends of the spiral pipe are respectively connected to external equipment. A control panel is provided on the surface of the tank body.

[0011] Preferably, a spray head is provided on the top wall inside the tank body, the outer surface of the tank body is fixedly connected to a water tank, the upper surface of the water tank is fixedly connected to a T-shaped connecting pipe, the upper end of the T-shaped connecting pipe is fixedly connected to two L-shaped connecting pipes, both of which pass through the interior of the tank body, and the two L-shaped connecting pipes are respectively connected to the two spray heads.

[0012] A special low-temperature continuous extraction device for low-molecular-weight water chestnut polysaccharides includes the following specific operating steps:

[0013] S1. Raw material preparation: Select fresh, pest-free water chestnuts, wash and shell them, and crush the water chestnut meat into particles of appropriate size to facilitate sufficient contact between the solvent and the raw materials during the subsequent extraction process.

[0014] S2. Selection of extraction solvent: Water can generally be used as the extraction solvent. In order to improve the extraction effect, an appropriate amount of auxiliary agent can also be added, such as a certain concentration of sodium chloride solution.

[0015] S3. Add the crushed water chestnut raw material into a low-temperature continuous extraction tank, and add the extraction solvent according to a certain material-liquid ratio. The material-liquid ratio is usually between 1:10 and 1:20. The specific ratio can be determined based on experimental optimization.

[0016] S4. Turn on the cooling system of the extraction tank and control the extraction temperature at a low level, generally between 40-60°C. Low temperature helps reduce the degradation of polysaccharides and maintain their structure and activity. Specifically, connect the spiral pipe and the external pipe to allow cooling medium to flow into the interior.

[0017] S5. Start the stirring device, specifically by turning on the switch of the motor. The output shaft of the motor will be driven to rotate through the controller. The rotation of the motor output shaft can drive the rotation of the support shaft. The rotation of the support shaft can drive the rotation of the first gear. The cooperation of the first gear and the second gear can drive the rotation of the rotating rod. The rotation of the rotating rod can drive the rotation of the stirring rod and the stirring blades, thereby achieving stirring of the internal raw materials.

[0018] In addition, when the rotating rod rotates, the adjustment handle will be driven to rotate with the cooperation of the first tooth and the second tooth, and the driving rod will also rotate with the cooperation of the synchronization block and the synchronization groove. At this time, the driving rod and the rotating rod are in a stationary state, so that the angle of the stirring blade will not change.

[0019] When the angle of the stirring blade needs to be adjusted, the adjusting handle is lifted up, and the adjusting handle slides outside the driving rod. After the first tooth and the second tooth are separated, the adjusting handle is turned. At this time, the driving rod is only driven to rotate under the cooperation of the synchronization block and the synchronization groove. The rotation of the driving rod and the cooperation of the first bevel gear and the second bevel gear can drive the rotation of the stirring rod, and finally the angle of the stirring blade is adjusted;

[0020] S6. Filtration and separation: After the extraction is completed, the extract is separated from the residue through a filtration device. Multi-layer filter cloth or precision filter can be used for filtration to obtain a clear extract.

[0021] S7. When the tank body needs to be cleaned, the pump body inside the water tank is started, and the subsequent cleaning water will be sprayed out from the inside of the sprinkler head through the T-shaped connecting pipe and the L-shaped connecting pipe, thereby flushing the inner wall of the tank body.

[0022] Compared with the existing technology, the present invention provides a low-temperature continuous extraction process and dedicated equipment for low-molecular-weight water chestnut polysaccharides, which has the following beneficial effects:

[0023] 1. The low-temperature continuous extraction process and special equipment for low-molecular-weight water chestnut polysaccharides realize the adjustment of the stirring blade angle by adjusting the coordination of structures such as the handle, the driving rod, the first bevel gear, the second bevel gear and the stirring rod, thereby facilitating the adjustment of the stirring mode and stirring intensity according to actual stirring needs. By increasing the stirring blade angle, the stirring blade can generate stronger axial and radial flow, promote material circulation, and avoid local uneven concentration. For low-viscosity materials, a smaller stirring blade angle can meet the mixing requirements, while also reducing energy consumption, with high practicality and flexibility.

[0024] 2. The low-temperature continuous extraction process and special equipment for low-molecular-weight water chestnut polysaccharide ensure the stability of the stirring blade angle through the coordination between the first latch tooth, the second latch tooth and the spring, and are highly practical.

[0025] 3. The low-temperature continuous extraction process and special equipment of the low-molecular-weight water chestnut polysaccharide facilitate flushing the interior of the tank through the cooperation of a water tank, a T-shaped connecting pipe, an L-shaped connecting pipe and a spray head. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a low-temperature continuous extraction process and dedicated equipment for low-molecular-weight water chestnut polysaccharides of the present invention;

[0027] Figure 2 It is a schematic diagram of the cross-sectional structure of the tank body of the present invention;

[0028] Figure 3 It is a schematic cross-sectional structural diagram of the rotating rod of the present invention;

[0029] Figure 4 for Figure 2 Enlarged view of point A in the middle;

[0030] Figure 5 This is a schematic cross-sectional view of the locking state of the handle according to the present invention;

[0031] Figure 6This is a schematic cross-sectional view of the unlocked state of the handle according to the present invention;

[0032] Figure 7 Schematic diagram of the structure of the shower head of the present invention.

[0033] In the figure: 1. tank body; 2. rotating rod; 3. stirring rod; 4. stirring blade; 5. first cavity; 6. driving rod; 7. first bevel gear; 8. second bevel gear; 9. motor; 10. second cavity; 11. supporting shaft; 12. first gear; 13. second gear; 14. adjusting handle; 15. third cavity; 16. circular plate; 17. spring; 18. groove; 19. first tooth; 20. second tooth; 21. synchronization groove; 22. synchronization block; 23. anti-skid groove; 24. annular chamber; 25. spiral pipe; 26. control panel; 27. feed port; 28. discharge port; 29. sprinkler head; 30. water tank; 31. T-shaped connecting pipe; 32. L-shaped connecting pipe. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] See also Figure 1-Figure 7 The present invention provides a technical solution: a low-temperature continuous extraction process and special equipment for low-molecular-weight water chestnut polysaccharide, comprising a tank body 1, a rotating rod 2 is provided inside the tank body 1, the upper end of the rotating rod 2 is rotatably connected to the top wall of the tank body 1, the outer rotatable connection of the rotating rod 2 is a stirring rod 3, and the outer rotatable connection of the stirring rod 3 is fixedly connected to a stirring blade 4. A first cavity 5 is opened inside the rotating rod 2, and the stirring rod 3 rotates and penetrates into the interior of the first cavity 5. The interior of the first cavity 5 is rotatably connected to a driving rod 6, and the outer fixed sleeve of the driving rod 6 is provided with a first bevel gear 7. One end of the stirring rod 3 located inside the first cavity 5 is fixedly provided with a second bevel gear 8, and the adjacent first bevel gear 7 and the second bevel gear 8 are meshed and connected. A driving assembly is provided on the upper surface of the tank body 1, the upper end of the rotating rod 2 rotates and penetrates out of the upper surface of the tank body 1, the upper end of the driving rod 6 rotates and penetrates out of the upper surface of the rotating rod 2, an adjusting assembly is provided on the outer surface of the driving rod 6, a feeding port 27 is provided on the upper surface of the tank body 1, and a discharging port 28 is provided at the lower end of the tank body 1.

[0036] The driving assembly includes a motor 9, which is fixedly connected to the upper surface of the tank body 1. A second cavity 10 is opened inside the top plate of the tank body 1. The interior of the second cavity 10 is rotatably connected with a support shaft 11. The output shaft of the motor 9 rotates and passes through the interior of the second cavity 10. The output shaft of the motor 9 is fixedly connected to the support shaft 11 through a coupling. The outer fixed sleeve of the support shaft 11 is provided with a first gear 12. One end of the rotating rod 2 located inside the second cavity 10 is fixedly provided with a second gear 13. The first gear 12 and the second gear 13 are meshed and connected.

[0037] Among them, the motor 9 is a self-locking motor, and the power supply, wires, controller and microcomputer and other structures are also matched with the motor 9. Since they are not the main structures, they will not be described in detail in this article.

[0038] The adjustment component includes an adjustment handle 14, which is slidably mounted on the outside of the driving rod 6. A third cavity 15 is provided inside the adjustment handle 14. The upper end of the driving rod 6 slides into the inside of the third cavity 15. A synchronization component is provided at one end of the driving rod 6 located inside the third cavity 15. An anti-slip groove 23 is provided on the surface of the adjustment handle 14. The setting of the anti-slip groove 23 increases the contact area with the staff's hand, thereby effectively preventing the hand from slipping out of the hand.

[0039] The synchronization assembly includes a circular plate 16, which is fixedly connected to the drive rod 6. Two synchronization blocks 22 are fixedly connected to the surface of the circular plate 16. Two synchronization grooves 21 are provided on the inner wall of the third cavity 15. The synchronization blocks 22 are slidably connected to the inside of the synchronization grooves 21. A spring 17 is fixedly connected between the lower surface of the circular plate 16 and the bottom wall of the third cavity 15. The spring 17 is movably sleeved on the outside of the drive rod 6.

[0040] A groove 18 is provided on the lower surface of the adjusting handle 14, and the adjusting handle 14 is sleeved on the outside of the rotating rod 2 through the groove 18. The inner wall of the groove 18 is fixedly connected with a first tooth 19, and the outer surface of the rotating rod 2 is fixedly connected with a second tooth 20, and the first tooth 19 and the second tooth 20 are engaged.

[0041] An annular chamber 24 is provided inside the side wall of the tank body 1, and a spiral pipe 25 is fixedly installed on the inner wall of the annular chamber 24. Both ends of the spiral pipe 25 pass through the interior of the tank body 1, and the two ends of the spiral pipe 25 are respectively connected to external equipment. A control panel 26 is provided on the surface of the tank body 1 to facilitate the introduction of a low-temperature medium, such as cold water, low-temperature brine or other refrigerant, into the spiral pipe 25, and to control the temperature inside the tank through heat exchange to keep it in a low-temperature state.

[0042] A spray head 29 is provided on the top wall inside the tank body 1, and a water tank 30 is fixedly connected to the outer surface of the tank body 1. A T-shaped connecting pipe 31 is fixedly connected to the upper surface of the water tank 30. The upper end of the T-shaped connecting pipe 31 is fixedly connected to two L-shaped connecting pipes 32. Both L-shaped connecting pipes 32 pass through the interior of the tank body 1, and the two L-shaped connecting pipes 32 are respectively connected to the two spray heads 29.

[0043] A pump body is further provided inside the water tank 30 , so as to facilitate water supply to the inside of the T-shaped connecting pipe 31 , so that the spray head 29 can flush the inner wall of the tank body 1 .

[0044] The low-temperature continuous extraction process of low-molecular-weight water chestnut polysaccharide comprises the following specific steps:

[0045] S1. Raw material preparation: Select fresh, pest-free water chestnuts, wash and shell them, and crush the water chestnut meat into particles of appropriate size to facilitate sufficient contact between the solvent and the raw materials during the subsequent extraction process.

[0046] S2. Selection of extraction solvent: Water can generally be used as the extraction solvent. In order to improve the extraction effect, an appropriate amount of auxiliary agent can also be added, such as a certain concentration of sodium chloride solution.

[0047] S3. Add the crushed water chestnut raw material into a low-temperature continuous extraction tank and add the extraction solvent according to a certain material-liquid ratio. The material-liquid ratio is usually between 1:10 and 1:20 (mass-to-volume ratio, g / mL). The specific ratio can be determined based on experimental optimization.

[0048] S4. Turn on the cooling system of the extraction tank and control the extraction temperature at a low level, generally between 40-60°C. Low temperature helps reduce the degradation of polysaccharides and maintain their structure and activity. Specifically, connect the spiral pipe 25 to the external pipe to allow cooling medium to flow into the interior.

[0049] S5. Start the stirring device, specifically by turning on the switch of the motor 9. The controller will drive the output shaft of the motor 9 to rotate. The rotation of the output shaft of the motor 9 can drive the rotation of the support shaft 11. The rotation of the support shaft 11 can drive the rotation of the first gear 12. The cooperation of the first gear 12 and the second gear 13 can drive the rotation of the rotating rod 2. The rotation of the rotating rod 2 can drive the rotation of the stirring rod 3 and the stirring blade 4, thereby achieving stirring of the internal raw materials.

[0050] In addition, when the rotating rod 2 rotates, the adjustment handle 14 will be driven to rotate with the cooperation of the first tooth 19 and the second tooth 20, and the driving rod 6 will also rotate with the cooperation of the synchronization block 22 and the synchronization groove 21. At this time, the driving rod 6 and the rotating rod 2 are in a stationary state, so that the angle of the stirring blade 4 will not change.

[0051] When the angle of the stirring blade 4 needs to be adjusted, the adjusting handle 14 is lifted upwards. At this time, the adjusting handle 14 will slide outside the driving rod 6. After the first teeth 19 and the second teeth 20 are separated, the adjusting handle 14 is rotated. At this time, under the cooperation of the synchronization block 22 and the synchronization groove 21, only the driving rod 6 is driven to rotate. The rotation of the driving rod 6 and the cooperation of the first bevel gear 7 and the second bevel gear 8 can drive the rotation of the stirring rod 3, and finally the angle of the stirring blade 4 is adjusted;

[0052] S6. Filtration and separation: After the extraction is completed, the extract is separated from the residue through a filtration device. Multi-layer filter cloth or precision filter can be used for filtration to obtain a clear extract.

[0053] S7. When the tank body needs to be cleaned, the pump body inside the water tank 30 is started, and the subsequent cleaning water will be sprayed out from the inside of the spray head 29 through the T-shaped connecting pipe 31 and the L-shaped connecting pipe 32, thereby flushing the inner wall of the tank body 1.

[0054] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A low-temperature continuous extraction device for low-molecular-weight water chestnut polysaccharides, comprising a tank (1), characterized in that: The tank body (1) is provided with a rotating rod (2) inside, the upper end of the rotating rod (2) is rotatably connected to the top wall of the tank body (1), the outside of the rotating rod (2) is rotatably connected to the stirring rod (3), the outside of the stirring rod (3) is fixedly connected to the stirring blade (4), the inside of the rotating rod (2) is provided with a first cavity (5), the stirring rod (3) rotatably penetrates the inside of the first cavity (5), the inside of the first cavity (5) is rotatably connected to the driving rod (6), the outside of the driving rod (6) is fixedly provided with a first bevel gear (7), the stirring rod ( 3) A second bevel gear (8) is fixedly sleeved at one end inside the first cavity (5), and the adjacent first bevel gear (7) and second bevel gear (8) are meshed and connected. A driving assembly is provided on the upper surface of the tank body (1), and the upper end of the rotating rod (2) rotates and passes through the upper surface of the tank body (1). The upper end of the driving rod (6) rotates and passes through the upper surface of the rotating rod (2). An adjusting assembly is provided on the outside of the driving rod (6). A feeding port (27) is provided on the upper surface of the tank body (1), and a discharging port (28) is provided at the lower end of the tank body (1).

2. The low-temperature continuous extraction device for low-molecular-weight water chestnut polysaccharides according to claim 1 is characterized in that: The driving assembly comprises a motor (9), the motor (9) and the upper surface of the tank body (1) are fixedly connected, a second cavity (10) is provided inside the top plate of the tank body (1), the interior of the second cavity (10) is rotatably connected to a support shaft (11), the output shaft of the motor (9) rotatably penetrates the interior of the second cavity (10), the output shaft of the motor (9) is fixedly connected to the support shaft (11) through a coupling, the outer fixed sleeve of the support shaft (11) is provided with a first gear (12), one end of the rotating rod (2) located inside the second cavity (10) is fixedly provided with a second gear (13), and the first gear (12) and the second gear (13) are meshed and connected.

3. The low-temperature continuous extraction equipment for low-molecular-weight water chestnut polysaccharides according to claim 1 is characterized in that: The adjustment assembly includes an adjustment handle (14), which is slidably sleeved on the outside of the driving rod (6), and a third cavity (15) is provided inside the adjustment handle (14). The upper end of the driving rod (6) slides through the inside of the third cavity (15), and a synchronization assembly is provided at one end of the driving rod (6) located inside the third cavity (15). An anti-slip groove (23) is provided on the surface of the adjustment handle (14).

4. The low-temperature continuous extraction equipment for low-molecular-weight water chestnut polysaccharides according to claim 3 is characterized in that: The synchronization assembly includes a circular plate (16), the circular plate (16) and the driving rod (6) are fixedly connected, two synchronization blocks (22) are fixedly connected to the surface of the circular plate (16), the inner wall of the third cavity (15) is provided with two synchronization grooves (21), the synchronization blocks (22) are slidably connected inside the synchronization grooves (21), a spring (17) is fixedly connected between the lower surface of the circular plate (16) and the bottom wall of the third cavity (15), and the spring (17) is movably sleeved on the outside of the driving rod (6).

5. The low-temperature continuous extraction equipment for low-molecular-weight water chestnut polysaccharides according to claim 4 is characterized in that: The lower surface of the adjusting handle (14) is provided with a groove (18), and the adjusting handle (14) is sleeved on the outside of the rotating rod (2) through the groove (18). The inner wall of the groove (18) is fixedly connected to a first tooth (19), and the outer surface of the rotating rod (2) is fixedly connected to a second tooth (20), and the first tooth (19) and the second tooth (20) are engaged.

6. The low-temperature continuous extraction equipment for low-molecular-weight water chestnut polysaccharides according to claim 1 is characterized in that: An annular chamber (24) is provided inside the side wall of the tank body (1), and a spiral pipe (25) is fixedly installed on the inner wall of the annular chamber (24). Both ends of the spiral pipe (25) pass through the interior of the tank body (1), and the two ends of the spiral pipe (25) are respectively connected to external equipment. A control panel (26) is provided on the surface of the tank body (1).

7. The low-temperature continuous extraction equipment for low-molecular-weight water chestnut polysaccharides according to claim 6, characterized in that: A spray head (29) is provided on the top wall inside the tank body (1), a water tank (30) is fixedly connected to the outer surface of the tank body (1), a T-shaped connecting pipe (31) is fixedly connected to the upper surface of the water tank (30), and two L-shaped connecting pipes (32) are fixedly connected to the upper end of the T-shaped connecting pipe (31), both of which penetrate into the interior of the tank body (1), and the two L-shaped connecting pipes (32) are respectively connected to the two spray heads (29).

8. A low-temperature continuous extraction process for low-molecular-weight water chestnut polysaccharides, comprising the following specific steps: S1. Raw material preparation: Select fresh, pest-free water chestnuts, wash and shell them, and crush the water chestnut meat into particles of appropriate size to facilitate sufficient contact between the solvent and the raw materials during the subsequent extraction process. S2. Selection of extraction solvent: Water can generally be used as the extraction solvent. In order to improve the extraction effect, an appropriate amount of auxiliary agent can also be added, such as a certain concentration of sodium chloride solution. S3. Add the crushed water chestnut raw material into a low-temperature continuous extraction tank and add the extraction solvent according to a certain material-liquid ratio. The material-liquid ratio is usually between 1:10 and 1:20 (mass-to-volume ratio, g / mL). The specific ratio can be determined based on experimental optimization. S4. Turn on the cooling system of the extraction tank and control the extraction temperature at a low level, generally between 40 and 60°C. Low temperature helps to reduce the degradation of polysaccharides and maintain their structure and activity. Specifically, the spiral pipe (25) is connected to the external pipe to allow the cooling medium to flow into the interior. S5. Start the stirring device, specifically by turning on the switch of the motor (9). The controller drives the output shaft of the motor (9) to rotate. The rotation of the output shaft of the motor (9) drives the rotation of the support shaft (11). The rotation of the support shaft (11) drives the rotation of the first gear (12). The cooperation of the first gear (12) and the second gear (13) drives the rotation of the rotating rod (2). The rotation of the rotating rod (2) drives the rotation of the stirring rod (3) and the stirring blade (4), thereby achieving stirring of the internal raw materials. In addition, when the rotating rod (2) rotates, the adjustment handle (14) is driven to rotate by the cooperation of the first tooth (19) and the second tooth (20), and the driving rod (6) is also rotated by the cooperation of the synchronization block (22) and the synchronization groove (21). At this time, the driving rod (6) and the rotating rod (2) are in a stationary state, so that the angle of the stirring blade (4) does not change. When the angle of the stirring blade (4) needs to be adjusted, the adjusting handle (14) is lifted upwards. At this time, the adjusting handle (14) slides outside the driving rod (6). After the first tooth (19) and the second tooth (20) are separated, the adjusting handle (14) is rotated. At this time, the driving rod (6) is only driven to rotate under the cooperation of the synchronization block (22) and the synchronization groove (21). The rotation of the driving rod (6) and the cooperation of the first bevel gear (7) and the second bevel gear (8) can drive the rotation of the stirring rod (3), and finally the angle of the stirring blade (4) is adjusted; S6. Filtration and separation: After the extraction is completed, the extract is separated from the residue through a filtration device. Multi-layer filter cloth or precision filter can be used for filtration to obtain a clear extract. S7. When the tank body needs to be cleaned, the pump body inside the water tank (30) is started, and the subsequent cleaning water is sprayed out from the inside of the spray head (29) through the T-shaped connecting pipe (31) and the L-shaped connecting pipe (32), thereby achieving the flushing of the inner wall of the tank body (1).

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