Double-kettle overturning type supercritical fluid extraction device

Abstract

The invention is applied to the technical field of supercritical fluid extraction, and discloses a double-kettle overturning type supercritical fluid extraction device which comprises a supporting base, an outer mounting ring is fixedly arranged in the middle of the upper surface of the supporting base, and a rotating inner mounting ring is mounted on the inner side surface of the outer mounting ring; air holes are formed in the side surfaces of the two ends of the drying cover, an overturning switching mechanism is arranged on the surface of the outer mounting ring, and the overall processing efficiency is improved in a double-kettle switching extraction mode. According to the double-kettle overturning type supercritical fluid extraction device, the double-kettle overturning alternate design is adopted, when one extraction kettle performs extraction operation, the other kettle can perform unloading and loading operation at the same time, the material changing time is greatly shortened, continuous production is achieved, compared with a traditional single-kettle device, the production efficiency is greatly improved, and the production cost is reduced. In large-scale industrial production, supercritical fluid extraction can be continuously carried out.

Description

Technical Field

[0001] The invention relates to the technical field of supercritical fluid extraction, in particular to a double-kettle flipping supercritical fluid extraction device. Background Art

[0002] As an efficient, environmentally friendly and highly selective separation technology, supercritical fluid extraction technology has shown great application potential in many fields such as food, medicine, and chemical industry. In today's society, with the increasing requirements for product quality and production efficiency, supercritical fluid extraction technology, with its unique advantages, is gradually becoming an indispensable and important technical means in many industries. At present, most of the supercritical fluid extraction devices widely used in the market are single-pot structures. This single-pot supercritical fluid extraction device has gradually exposed a series of problems that are difficult to ignore during actual use; First, the disadvantage of a long material change time in a single-kettle processing seriously restricts the improvement of production efficiency. In the operation mode of a single-kettle device, after an extraction operation is completed, it is necessary to wait for the extraction kettle to cool to a suitable temperature before unloading and reloading. This process not only consumes a lot of time, but also causes interruptions in the entire production process, making it impossible to achieve continuous production. For those industrial fields that have high requirements for production efficiency, this disadvantage of a single-kettle device is particularly prominent. For example, in the food industry, for the production of certain natural extracts, due to large market demand and tight delivery time, the inefficient material change process of a single-kettle device will lead to an extension of the production cycle and fail to meet market demand in a timely manner, thereby affecting the company's economic benefits and market competitiveness. In the pharmaceutical field, the extraction of some drug components also requires efficient production equipment to ensure a stable supply of drugs, and the long material change time of a single-kettle device will undoubtedly hinder production progress and increase production costs. Secondly, when a single-kettle device is performing a material change operation, a certain amount of steam usually remains in the extraction kettle. Once the kettle cover is opened, the steam may be released quickly, posing a risk of scalding to the operator. In the actual production process, the operator needs to be extremely careful in performing the material change operation, which not only increases the complexity and difficulty of the operation, but also makes the production process more uncertain. In order to ensure the safety of the operators, the company has to invest more resources in safety training and the setting of protective measures, which increases the safety management cost. Moreover, even if various protective measures are taken, the risk of scalding cannot be completely eliminated. Once a safety accident occurs, it will not only cause serious harm to the health of the operator, but also have a major impact on the production and operation of the company. Summary of the invention

[0003] The object of the present invention is to provide a double-kettle flipping supercritical fluid extraction device to solve the problems in the above background technology that the long material change time affects the processing efficiency and the residual steam during material change poses a safety hazard.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a double-kettle flip-type supercritical fluid extraction device, comprising a supporting base, an outer mounting ring is fixedly arranged in the middle of the upper surface of the supporting base, and a rotating inner mounting ring is installed on the inner surface of the outer mounting ring, an extraction kettle is fixedly arranged on the inner surface of the inner mounting ring, an injection cap is fixedly arranged on one end of the extraction kettle by bolts, and an injection valve port is fixedly arranged on the outer surface of the injection cap facing away from the extraction kettle, a drying cap is fixedly arranged on one end of the extraction kettle by bolts, and an output valve port is fixedly arranged on the outer surface of the drying cap facing away from the extraction kettle, and the interior of the drying cap is filled with desiccant, an air hole is opened on the side surface of one end of the injection cap facing the extraction kettle, and air holes are opened on the side surfaces of both ends of the drying cap, and a flip switching mechanism is arranged on the surface of the outer mounting ring, so as to improve the overall processing efficiency by switching extraction of double kettles.

[0005] Preferably, the flip switching mechanism comprises: a driving motor, which is fixedly mounted on the outer surface of the outer mounting ring, and one end of the output shaft of the driving motor is fixedly connected to the driving gear, the outer surface of the outer mounting ring is fixedly provided with a mounting base, and a rotatable movable rod is installed on the end of the mounting base connected to the outer mounting ring, a fluid connector is fixedly mounted on the surface of one side of the movable rod facing the extraction kettle, and a sealing disk is fixedly mounted on the other side of the movable rod facing the extraction kettle, a first electric push rod is fixedly mounted on the upper surface of an end of the mounting base away from the outer mounting ring, and an extrusion frame is fixedly connected to the end of the first electric push rod facing the outer mounting ring, and a clamping rod is fixedly connected to the end of the extrusion frame facing the outer mounting ring, and a limiting groove is provided on the outer surface of the inner mounting ring.

[0006] By adopting the above technical solution, the two extraction kettles can achieve the purpose of alternate extraction and improve processing efficiency by flipping and rotating.

[0007] Preferably, a second electric push rod is fixedly provided on the outer surface of the outer mounting ring, and a rotating electric heating plate is installed on the side surface of one end of the second electric push rod facing the extraction kettle, the electric heating plate is arc-shaped, and a spring is connected between the outer surface of the electric heating plate and one end of the second electric push rod, and the inner surface of the electric heating plate is in contact with the outer surface of the extraction kettle.

[0008] By adopting the above technical solution, the electric heating plate can heat the extraction kettle.

[0009] Preferably, a pressure unsealing mechanism is provided inside the injection cap, which opens by pressurizing to avoid burns caused by the outflow of high-temperature gas when replacing raw materials.

[0010] By adopting the above technical solution, steam will not overflow from the injection valve port before the injection cover is opened, causing a safety accident.

[0011] Preferably, the pressure unsealing mechanism includes a closing plate, which is slidably mounted inside the injection cover, and a first fixed plate is fixedly mounted on the outer surface of the closing plate, and a second fixed plate is fixedly mounted on the inner surface of the injection cover on one side of the first fixed plate, an air hole is opened on the outer surface of the closing plate, a center rod is fixedly mounted on one end of the closing plate facing the injection valve port, and one end of the center rod is rotatably connected to the injection valve port, and a sliding sliding rod is mounted on the end of the center rod rotatably connected to the injection valve port, a piston plate is fixedly connected to the end of the sliding rod facing away from the center rod, and a twisted rod is fixedly mounted on the side surface of the piston plate, a piston cylinder is fixedly mounted on the inner surface of the injection valve port, and a clamping rod is fixedly mounted on the inner surface of the piston cylinder.

[0012] By adopting the above technical solution, the injection valve port can be automatically opened when the fluid is injected.

[0013] Preferably, gear blocks are evenly and fixedly provided on the outer surface of the inner mounting ring, and the inner mounting ring is meshedly connected with the driving gear via the gear blocks.

[0014] By adopting the above technical solution, the inner mounting ring can be driven to rotate relative to the outer mounting ring.

[0015] Preferably, a spring is connected between the movable rod and the mounting base, the outer surface of the sealing disk is in contact with one end surface of the injection cover and the drying cover, and the sealing disk is connected to one end of the fluid connector.

[0016] By adopting the above technical solution, the sealing disc can respectively seal and connect the injection cover and the drying cover.

[0017] Preferably, the extrusion frame is designed in a C shape, and the two ends of the extrusion frame are respectively fitted with the movable rods on both sides, one end of the clamping rod is designed in an isosceles trapezoid, and one end of the clamping rod with an isosceles trapezoidal design passes through the inner surface of the outer mounting ring and is clamped and installed in the limit groove.

[0018] By adopting the above technical solution, the clamping rod can limit the relative positions of the outer mounting ring and the inner mounting ring by engaging with the limiting groove.

[0019] Preferably, the pores on the surface of the closing plate are offset from the pores on the outer surface of the injection cover facing one end of the extraction kettle, and the outer surface of the closing plate fits with the inner surface of the injection cover, the first fixing plate and the second fixing plate are offset, and a spring is connected between the first fixing plate and the second fixing plate.

[0020] By adopting the above technical solution, the first fixing plate and the second fixing plate can rotate and reset the closing plate under the pull of the spring.

[0021] Preferably, a spring is connected between the center rod and the sliding rod, the piston plate and the piston cylinder are connected by sliding friction, the twisted rod and the clamping rod are installed in a clamping manner, and the center rod, sliding rod, piston plate and twisted rod are all concentrically arranged.

[0022] By adopting the above technical solution, the twisted rod can drive the closing plate to rotate so that the pores on the surface of the closing plate overlap with the pores on the surface.

[0023] Compared with the prior art, the present invention has the following beneficial effects: the double-kettle flip-type supercritical fluid extraction device: 1. The double kettle flip rotation design is adopted. When one extraction kettle is performing extraction operation, the other kettle can be unloading and loading at the same time, which greatly shortens the material change time and realizes continuous production. Compared with the traditional single kettle device, the production efficiency has been greatly improved. In large-scale industrial production, supercritical fluid extraction can be carried out uninterruptedly; Furthermore, through the double kettle design, there is no need to wait for a single kettle to cool before changing materials, which saves a lot of time cost. At the same time, the kettle rotation operation can make the supercritical fluid extraction process more stable, reducing the impact of frequent material changes and temperature fluctuations on the extraction effect, thereby ensuring the stability and consistency of product quality; 2. The design of opening the reaction air inlet by gas pressure avoids the operator from directly contacting the high-temperature and high-pressure extraction kettle, reducing the risk of being scalded by steam. The operator can operate in a safe environment without worrying about the harm caused by the release of steam due to opening the kettle cover. This not only ensures the personal safety of the operator, but also reduces the uncertainty of manual operation and improves the stability and reliability of the production process; Furthermore, precise gas pressure control to open the gas inlet ensures stable input of the supercritical fluid, which is beneficial to optimize the extraction process and further improve the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the movable rod and the fluid joint of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the overall working state of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the installation base and the movable rod in the working state of connection of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the overall cutaway surface of the present invention; Figure 6 It is a three-dimensional structural schematic diagram of the connection section of the mounting base, the first electric push rod and the clamping rod of the present invention; Figure 7 It is a three-dimensional structural schematic diagram of the cross-section surface of the extrusion frame, the clamping rod and the limiting groove of the present invention; Figure 8 It is a three-dimensional structural schematic diagram of the cross-section surface connecting the center rod and the sliding rod of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the connection between the closing plate and the first fixing plate of the present invention; Fig.10 It is a schematic diagram of the three-dimensional structure of the internal mounting ring, extraction kettle and limiting groove connection of the present invention.

[0025] In the figure: 1. support base; 2. outer mounting ring; 3. inner mounting ring; 4. extraction kettle; 5. injection cover; 6. injection valve port; 7. drying cover; 8. output valve port; 9. drive motor; 10. drive gear; 11. mounting base; 12. movable rod; 13. fluid connector; 14. sealing disk; 15. first electric push rod; 16. extrusion frame; 17. clamping rod; 18. limiting groove; 19. second electric push rod; 20. electric heating plate; 21. closing plate; 22. first fixed plate; 23. second fixed plate; 24. center rod; 25. sliding rod; 26. piston plate; 27. twisted rod; 28. piston cylinder; 29. ​​clamping rod. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-Figure 10 The present invention provides a technical solution: a double-kettle flip-type supercritical fluid extraction device.

[0028] Embodiment 1: This embodiment discloses a support base 1, an outer mounting ring 2 is fixedly provided in the middle of the upper surface of the support base 1, and a rotatable inner mounting ring 3 is installed on the inner surface of the outer mounting ring 2, an extraction kettle 4 is fixedly provided on the inner surface of the inner mounting ring 3, an injection cap 5 is fixedly provided on one end of the extraction kettle 4 by bolts, and an injection valve port 6 is fixedly provided on the outer surface of the end of the injection cap 5 facing away from the extraction kettle 4, a drying cap 7 is fixedly provided on one end of the extraction kettle 4 by bolts, and an output valve port 8 is fixedly provided on the outer surface of the end of the drying cap 7 facing away from the extraction kettle 4, and a desiccant is filled inside the drying cap 7, an air hole is provided on the side surface of the end of the injection cap 5 facing the extraction kettle 4, and air holes are provided on the side surfaces of both ends of the drying cap 7; A second electric push rod 19 is fixedly arranged on the outer surface of the outer mounting ring 2, and a rotating electric heating plate 20 is installed on the side surface of one end of the second electric push rod 19 facing the extraction kettle 4. The electric heating plate 20 is designed to be arc-shaped, and a spring is connected between the outer surface of the electric heating plate 20 and one end of the second electric push rod 19, and the inner surface of the electric heating plate 20 is in contact with the outer surface of the extraction kettle 4; During normal processing, the injection cover 5 is opened to put the material to be extracted into the extraction kettle 4, and then the injection cover 5 is fixedly installed with the extraction kettle 4. When the fluid is injected into the extraction kettle 4 through the injection valve port 6 and the injection cover 5, the raw material is extracted, and the extracted gas is dried by the desiccant inside the drying cover 7 and then output through the output valve port 8. During the process, the second electric push rod 19 is started to drive the electric heating plate 20 to slide toward the extraction kettle 4. The end of the electric heating plate 20 connected to the second electric push rod 19 is squeezed by the outer surface of the extraction kettle 4, so that the two electric heating plates 20 rotate to form a semi-ring, and the purpose of heating the extraction kettle 4 by the electric heating plate 20 is achieved by closing the upper and lower semi-rings.

[0029] Embodiment 2: Based on Embodiment 1, this embodiment discloses that a flip switching mechanism is provided on the surface of the outer mounting ring 2, and the overall processing efficiency is improved by switching extraction in two kettles; The flip switching mechanism includes: a driving motor 9, which is fixedly mounted on the outer surface of the outer mounting ring 2, and one end of the output shaft of the driving motor 9 is fixedly connected to a driving gear 10, a mounting base 11 is fixedly arranged on the outer surface of the outer mounting ring 2, and a rotating movable rod 12 is installed on one end of the mounting base 11 connected to the outer mounting ring 2, a fluid connector 13 is fixedly mounted on one side surface of the movable rod 12 facing the extraction kettle 4, and a sealing disk 14 is fixedly mounted on the other side surface of the movable rod 12 facing the extraction kettle 4, a first electric push rod 15 is fixedly mounted on the upper surface of one end of the mounting base 11 away from the outer mounting ring 2, and an extrusion frame 16 is fixedly connected to the end of the first electric push rod 15 facing the outer mounting ring 2, and a clamping rod 17 is fixedly connected to the end of the extrusion frame 16 facing the outer mounting ring 2, and a limiting groove 18 is provided on the outer surface of the inner mounting ring 3; The outer surface of the inner mounting ring 3 is evenly and fixedly provided with gear blocks, and the inner mounting ring 3 is meshed and connected with the driving gear 10 through the gear blocks; A spring is connected between the movable rod 12 and the mounting base 11, the outer surface of the sealing disk 14 is in contact with one end surface of the injection cover 5 and the drying cover 7, and the sealing disk 14 is connected with one end of the fluid connector 13; The extrusion frame 16 is designed in a C shape, and the two ends of the extrusion frame 16 are respectively fitted with the movable rods 12 on both sides, and one end of the clamping rod 17 is designed in an isosceles trapezoidal shape, and one end of the clamping rod 17 with an isosceles trapezoidal design passes through the inner surface of the outer mounting ring 2 and is clamped and installed in the limiting groove 18; After the processing is completed, the drive motor 9 is started. The drive motor 9 drives the inner mounting ring 3 to rotate relative to the outer mounting ring 2 fixed on the support base 1 through the engagement of the drive gear 10 with the inner mounting ring 3, so that the two extraction kettles 4 exchange positions. Then the first electric push rod 15 on the mounting base 11 is started to drive the extrusion frame 16 and the clamping rod 17 to slide toward the extraction kettle 4. At this time, the clamping rod 17 is engaged with the limiting groove 18 to fix the relative position of the inner mounting ring 3 and the outer mounting ring 2, and the extrusion frame 16 squeezes the movable rod 12 to make the two sealing disks 14 respectively fit with the injection valve port 6 and the output valve port 8 to achieve sealing, and then they are connected to the intake and exhaust pipes respectively through the fluid connector 13.

[0030] Embodiment 3: Based on Embodiment 1 and Embodiment 2, this embodiment discloses that a pressure unsealing mechanism is provided inside the injection cap 5, which is opened by pressurization to avoid burns caused by the outflow of high-temperature gas when replacing raw materials; The pressure unsealing mechanism includes a closing plate 21, which is slidably mounted inside the injection cap 5, and a first fixing plate 22 is fixedly mounted on the outer surface of the closing plate 21, and a second fixing plate 23 is fixedly mounted on the inner surface of the injection cap 5 on one side of the first fixing plate 22, and an air hole is opened on the outer surface of the closing plate 21, a center rod 24 is fixedly mounted on one end of the closing plate 21 facing the injection valve port 6, and one end of the center rod 24 is rotatably connected to the injection valve port 6, and a sliding sliding rod 25 is mounted on the end of the center rod 24 rotatably connected to the injection valve port 6, a piston plate 26 is fixedly connected to the end of the sliding rod 25 facing away from the center rod 24, and a twisted rod 27 is fixedly mounted on the side surface of the piston plate 26, a piston cylinder 28 is fixedly mounted on the inner surface of the injection valve port 6, and a clamping rod 29 is fixedly mounted on the inner surface of the piston cylinder 28; The pores on the surface of the closing plate 21 are staggered with the pores on the outer surface of the injection cover 5 facing the extraction kettle 4, and the outer surface of the closing plate 21 is in contact with the inner surface of the injection cover 5. The first fixing plate 22 and the second fixing plate 23 are staggered, and a spring is connected between the first fixing plate 22 and the second fixing plate 23. A spring is connected between the center rod 24 and the sliding rod 25, the piston plate 26 and the piston cylinder 28 are connected by sliding friction, the twisted rod 27 and the clamping rod 29 are clamped and installed, and the center rod 24, the sliding rod 25, the piston plate 26 and the twisted rod 27 are all concentrically arranged; When the fluid is injected through the fluid connector 13 and the sealing plate 14 through the injection valve port 6, the pressure pushes the piston plate 26 inside the piston cylinder 28 to slide so that the twisted rod 27 moves relative to the clamping rod 29. The clamping rod 29 drives the twisted rod 27 to rotate by engaging with the twisted rod 27. The twisted rod 27 drives the center rod 24 to rotate through the piston plate 26 and the sliding rod 25. The center rod 24 drives the closing plate 21 to rotate and compresses the spring between the first fixed plate 22 and the second fixed plate 23, so that the pores on the surface of the closing plate 21 are aligned with the injection cover 5. The air holes between the inner surfaces overlap to realize the injection of fluid. After the extraction is completed and the fluid injection is stopped, the extraction kettle 4 is driven to rotate away from the mounting base 11. At this time, the piston plate 26 loses the pushing force of the pressure and slides back to its original position under the support of the spring between the sliding rod 25 and the center rod 24. The closing plate 21 is also returned to its original position under the support of the spring between the first fixing plate 22 and the second fixing plate 23, so that the air holes on the surface of the closing plate 21 and the air holes on the inner surface of the injection cover 5 are misaligned, thereby avoiding the steam overflowing from the extraction kettle 4 and causing burns when the injection cover 5 is removed.

[0031] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims

1. A double-kettle flip-type supercritical fluid extraction device, comprising a support base (1), an outer mounting ring (2) fixedly arranged in the middle of the upper surface of the support base (1), and a rotatable inner mounting ring (3) mounted on the inner surface of the outer mounting ring (2), characterized in that: An extraction kettle (4) is fixedly mounted on the inner surface of the inner mounting ring (3); an injection cap (5) is fixedly mounted on one end of the extraction kettle (4) by means of bolts, and an injection valve port (6) is fixedly mounted on the outer surface of the end of the injection cap (5) facing away from the extraction kettle (4); a drying cap (7) is fixedly mounted on one end of the extraction kettle (4) by means of bolts, and an output valve port (8) is fixedly mounted on the outer surface of the end of the drying cap (7) facing away from the extraction kettle (4), and a desiccant is filled inside the drying cap (7); an air hole is formed on the side surface of one end of the injection cap (5) facing the extraction kettle (4), and air holes are formed on the side surfaces of both ends of the drying cap (7); a flip switching mechanism is formed on the surface of the outer mounting ring (2), and the overall processing efficiency is improved by switching extraction of two kettles.

2. A double-kettle flip-type supercritical fluid extraction device according to claim 1, characterized in that: The flip switching mechanism comprises: a driving motor (9), the driving motor (9) being fixedly mounted on the outer surface of the outer mounting ring (2), and one end of the output shaft of the driving motor (9) being fixedly connected to a driving gear (10), a mounting base (11) being fixedly arranged on the outer surface of the outer mounting ring (2), and a rotatable movable rod (12) being mounted on one end of the mounting base (11) connected to the outer mounting ring (2), and a fluid connector (13) being fixedly mounted on one side surface of one end of the movable rod (12) facing the extraction kettle (4) ), and a sealing disk (14) is fixedly mounted on the other side surface of one end of the movable rod (12) facing the extraction kettle (4), a first electric push rod (15) is fixedly mounted on the upper surface of one end of the mounting base (11) away from the outer mounting ring (2), and an extrusion frame (16) is fixedly connected to one end of the first electric push rod (15) facing the outer mounting ring (2), and a clamping rod (17) is fixedly connected to one end of the extrusion frame (16) facing the outer mounting ring (2), and a limiting groove (18) is provided on the outer side surface of the inner mounting ring (3).

3. A double-kettle flip-type supercritical fluid extraction device according to claim 1, characterized in that: A second electric push rod (19) is fixedly mounted on the outer surface of the outer mounting ring (2), and a rotatable electric heating plate (20) is mounted on the side surface of one end of the second electric push rod (19) facing the extraction kettle (4). The electric heating plate (20) is of arc-shaped design, and a spring is connected between the outer surface of the electric heating plate (20) and one end of the second electric push rod (19), and the inner surface of the electric heating plate (20) is in contact with the outer surface of the extraction kettle (4).

4. A double-kettle flip-type supercritical fluid extraction device according to claim 1, characterized in that: The injection cap (5) is provided with a pressure unsealing mechanism inside, which opens by applying pressure to avoid burns caused by the outflow of high-temperature gas when replacing raw materials.

5. A double-kettle tumbling supercritical fluid extraction device according to claim 4, characterized in that: The pressure unsealing mechanism comprises a closing plate (21), the closing plate (21) being slidably mounted inside the injection cap (5), a first fixing plate (22) being fixedly mounted on the outer surface of the closing plate (21), and a second fixing plate (23) being fixedly mounted on the inner surface of the injection cap (5) on one side of the first fixing plate (22), an air hole being formed on the outer surface of the closing plate (21), and a center rod (24) being fixedly mounted on one end of the closing plate (21) facing the injection valve port (6), and the center rod (23) One end of the center rod (24) is rotatably connected to the injection valve port (6), and a sliding rod (25) is installed on the end of the center rod (24) rotatably connected to the injection valve port (6), and the end of the sliding rod (25) that is rotatably connected to the injection valve port (6) is fixedly connected to a piston plate (26), and a twisted rod (27) is fixedly provided on the side surface of the piston plate (26), and a piston cylinder (28) is fixedly provided on the inner surface of the injection valve port (6), and a clamping rod (29) is fixedly provided on the inner surface of the piston cylinder (28).

6. A double-kettle flip-type supercritical fluid extraction device according to claim 2, characterized in that: The outer surface of the inner mounting ring (3) is evenly and fixedly provided with tooth blocks, and the inner mounting ring (3) is meshedly connected with the driving gear (10) via the tooth blocks.

7. The double-kettle flip-type supercritical fluid extraction device according to claim 2, characterized in that: A spring is connected between the movable rod (12) and the mounting base (11); the outer surface of the sealing disk (14) is in contact with one end surface of the injection cover (5) and the drying cover (7); and the sealing disk (14) is in communication with one end of the fluid connector (13).

8. The double-kettle flipping supercritical fluid extraction device according to claim 2, characterized in that: The extrusion frame (16) is designed in a C-shape, and the two ends of the extrusion frame (16) are respectively fitted with the movable rods (12) on both sides, and one end of the clamping rod (17) is designed in an isosceles trapezoidal shape, and the end of the clamping rod (17) in the isosceles trapezoidal shape passes through the inner surface of the outer mounting ring (2) and is clamped and installed in the limit groove (18).

9. The double-kettle flipping supercritical fluid extraction device according to claim 5, characterized in that: The air holes on the surface of the closing plate (21) and the air holes on the outer surface of the injection cover (5) facing the extraction kettle (4) are arranged in a staggered manner, and the outer surface of the closing plate (21) is in contact with the inner surface of the injection cover (5). The first fixing plate (22) and the second fixing plate (23) are arranged in a staggered manner, and a spring is connected between the first fixing plate (22) and the second fixing plate (23).

10. The double-kettle flipping supercritical fluid extraction device according to claim 5, characterized in that: A spring is connected between the central rod (24) and the sliding rod (25); the piston plate (26) and the piston cylinder (28) are connected by sliding friction; the twisted rod (27) and the clamping rod (29) are mounted by clamping; and the central rod (24), the sliding rod (25), the piston plate (26) and the twisted rod (27) are all concentrically arranged.

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