Alkannin extraction system

Abstract

The utility model belongs to the technical field of alkannin extraction, in particular relates to an alkannin extraction system, and aims to solve the problems of low extraction efficiency and unsmooth liquid drainage caused by difficulty in uniformly and circularly spraying layered materials in a temperature-pressure coordinated and controllable closed environment and easiness in blockage of a liquid outlet at the bottom of a tank in the conventional alkannin extraction device. According to the scheme, the extraction device comprises an extraction tank, a storage screen frame, an electric heating wire, a liquid spraying ring and a liquid spraying pipe, the pressure in the tank is adjustable in a stepped mode through a pressurization assembly, and the temperature in the tank is adjustable in a stepped mode through the electric heating wire; the bottom end of the liquid spraying pipe is connected with a pressing sleeve pipe, the tank bottom is connected with an alignment bottom pipe, the pressing sleeve pipe is movably inserted into the alignment bottom pipe, a pipe body of the pressing sleeve pipe is provided with filter screen holes, a pipe body of the alignment bottom pipe is provided with a liquid passing notch, and the positions of the pressing sleeve pipe and the alignment bottom pipe are adjustable. According to the utility model, efficient extraction and convenient cleaning of alkannin are realized through temperature and pressure stepped cooperative control, internal and external dual-circulation spraying and a tank bottom filtering structure capable of switching an extraction mode and a cleaning mode.

Description

Technical Field

[0001] This utility model relates to an extraction device, specifically a shikonin extraction system, belonging to the field of shikonin extraction technology. Background Technology

[0002] Shikonin, a naphthoquinone-based natural pigment extracted from the roots of plants in the Boraginaceae family, possesses various pharmacological activities, including anti-inflammatory, anti-tumor, and wound-healing properties, and is widely used in the pharmaceutical, cosmetic, and food industries. Due to the low content of shikonin in *Lithospermum erythrorhizon* and its heat sensitivity, research on its extraction processes and equipment has been a key focus in the industry. Traditional shikonin extraction devices mostly employ atmospheric pressure immersion or reflux extraction methods. Conventional extraction tanks typically use jacketed heating and can operate in a closed environment, but the internal pressure is relatively low, making it difficult to achieve enhanced extraction under high-pressure conditions.

[0003] To optimize extraction efficiency, various improved solutions have emerged in existing technologies. For example, CN108558633A discloses an extraction device capable of rapidly extracting shikonin. This device includes a grinder, an ultrasonic cleaner, and an extraction tank, and is equipped with a temperature controller for precise temperature control. However, its structural design is still based on conventional extraction equipment. Although it can control the extraction temperature, it lacks pressure regulation capabilities, making it difficult to meet the requirements for coordinated temperature and pressure control in shikonin extraction. Furthermore, the material stacking method is simple, and the solvent is prone to forming channels during the extraction process, resulting in uneven contact between the material and the solvent, which affects the full dissolution of the effective components. Another example is a shikonin oil filtration extraction device disclosed in CN222250646U. This device has a detachable filter screen installed inside the extraction tank, and a heating device is installed at the inner edge of the extraction tank to accelerate the oil yield, solving the problems of impurity and low oil yield in existing shikonin oil extraction. However, although the device is equipped with a filter screen for material filtration, its filter structure is a fixed design. During long-term extraction, the surface of the filter screen is easily covered and clogged by medicinal residue, requiring machine shutdown and disassembly for cleaning, which seriously affects production efficiency. At the same time, the device uses a monolithic heating method, which cannot differentiate the temperature of materials at different layers according to the extraction process, making it difficult to meet the multiple requirements of cell wall disruption, solubilization and dissolution, and prevention of thermal degradation. In summary, existing shikonin extraction devices mainly adopt a single-cavity structure with a simple material stacking method. During the extraction process, the solvent easily forms channels, resulting in uneven contact between the material and the solvent. This is especially true for hard medicinal materials such as shikonin root, where static soaking makes it difficult to achieve rapid cell wall disruption. Furthermore, extraction is mostly carried out using monolithic jacket heating or single electric heating element heating, which cannot differentiate the temperature of materials at different extraction stages according to the extraction process. Research shows that shikonin extraction is quite sensitive to temperature, and a single temperature cannot meet the multiple requirements of cell wall disruption, solubilization and dissolution, and prevention of thermal degradation. Utility Model Content

[0004] This invention provides a shikonin extraction system to address the problems of existing shikonin extraction devices, which struggle to achieve uniform circulating spraying of layered materials in a temperature- and pressure-controlled closed environment, and are prone to clogging at the bottom outlet of the tank, resulting in low extraction efficiency and poor drainage.

[0005] The present invention achieves the above objectives through the following technical solution: a shikonin extraction system, including an extraction tank, which is provided with a storage mesh frame, an electric heating wire, a spray ring and a spray pipe. The upper end of the extraction tank is connected to a tank cover, and a pressurizing component is connected to the tank cover. The pressure inside the extraction tank is adjustable in steps via the pressurizing component, and the temperature inside the extraction tank is adjustable in steps via the electric heating wire.

[0006] Multiple storage mesh frames are stacked in layers and suspended inside the extraction tank. The heating wire and the spray ring are connected to the inner wall of the extraction tank and are also sleeved on the outer periphery of the storage mesh frame.

[0007] The spray pipe is vertically installed inside the extraction tank. Both the spray ring and the spray pipe are connected to a circulation assembly. The inlet end of the circulation assembly is connected to the bottom of the extraction tank.

[0008] The bottom of the spray pipe is connected to a pressure sleeve, and the bottom of the extraction tank is connected to an alignment bottom pipe. The connection position of the alignment bottom pipe is located directly above the liquid inlet of the circulation component. The pressure sleeve is movably inserted into the alignment bottom pipe. The body of the pressure sleeve has a filter screen, and the body of the alignment bottom pipe has a liquid passage slot. The position between the filter screen and the liquid passage slot is adjustable.

[0009] As a further embodiment of this utility model: the pressurization assembly includes a pressurization inlet pipe, a pressurization pump and an inert gas storage tank. One end of the pressurization inlet pipe is connected to the inside of the tank cover, and the other end of the pressurization inlet pipe is connected to the inert gas storage tank via the pressurization pump. A barometer, a thermometer and a pressure relief valve are also fixedly connected to the tank cover, and the detection ends of the barometer and the thermometer extend into the inside of the extraction tank. The pressure relief valve is connected to the inside of the extraction tank.

[0010] As a further embodiment of this utility model: a supporting bottom net is fixedly connected to the inner bottom of the extraction tank, and a storage mesh frame is set on the supporting bottom net. Several limiting blocks distributed in a ring at equal intervals are fixedly connected to the supporting bottom net, and the storage mesh frame abuts against the limiting blocks. A mesh cover is provided at the open end of the storage mesh frame, and two symmetrically arranged positioning sleeves are connected to the frame body of the storage mesh frame. The bottom surface of the mesh cover and the bottom end of the storage mesh frame are both connected to symmetrically arranged positioning rods. The mesh cover and its adjacent storage mesh frame are engaged through the positioning rods and positioning sleeves, and two adjacent storage mesh frames are engaged through the positioning rods and positioning sleeves.

[0011] As a further embodiment of this utility model: a support rod is fixedly connected between the heating wire and the inner wall of the extraction tank. Multiple support rods are spaced apart along the circumference of the extraction tank. The heating wire is wound into a spiral structure and sleeved around the outer periphery of the storage mesh frame. Multiple sets of heating wires are arranged in layers along the axial direction of the extraction tank. Each set of heating wires corresponds to one of the layered and stacked storage mesh frames.

[0012] As a further improvement of this utility model: the spray ring has a liquid guiding cavity inside, and the spray ring has multiple side wall spray holes on the side facing the storage mesh frame, all of which are connected to the liquid guiding cavity; the spray ring is arranged in three groups at intervals along the axial direction of the extraction tank, and each group of spray rings corresponds to the upper, middle and lower parts of the stacked storage mesh frame, and the liquid guiding cavity of the spray ring is connected to the circulation component.

[0013] As a further improvement of this utility model: the spray pipe is arranged along the central axis of the extraction tank, and multiple central spray holes are opened on the side of the spray pipe facing the storage mesh frame. The central spray holes are arranged at intervals along the axial direction of the spray pipe and correspond one-to-one with the layered and stacked storage mesh frames.

[0014] As a further improvement of this utility model: a compression spring is provided between the pressure sleeve and the alignment bottom tube, and one end of the compression spring abuts against the shoulder of the pressure sleeve and the other end of the compression spring abuts against the opening of the alignment bottom tube; the pressure sleeve slides along the axial direction of the alignment bottom tube to adjust the overlapping area of ​​the filter mesh and the liquid passage opening.

[0015] As a further embodiment of this utility model: the circulation component includes a circulation infusion pipe and a three-way valve. One end of the three-way valve serves as the inlet of the circulation component and is connected to the center of the bottom of the extraction tank. The other two ends of the three-way valve are outlets. One outlet of the three-way valve is connected to the circulation infusion pipe, and the other outlet of the three-way valve is connected to an external extraction liquid collection pipeline. The vertical body of the circulation infusion pipe is connected to the tank wall of the extraction tank, and the circulation infusion pipe is connected to the liquid guiding chamber of multiple spray rings. A delivery hose is connected between the circulation infusion pipe and the spray pipe, and a circulation pump is also connected to the body of the circulation infusion pipe.

[0016] As a further improvement of this utility model: the bottom end of the extraction tank is fixedly connected with multiple support feet at intervals around the circumference, and a docking rod is vertically connected at the center of the lower surface of the tank cover. The bottom end of the docking rod is connected with a docking sleeve, and the docking sleeve is sleeved on the top of the spray pipe when the tank cover and the extraction tank are in the docking state.

[0017] The beneficial effects of this utility model are:

[0018] 1. This utility model is equipped with an extraction tank, a storage mesh frame, an electric heating wire, a spray ring, and a spray pipe. The pressure inside the extraction tank is adjustable in stages via a pressurization component, and the temperature inside the extraction tank is adjustable in stages via the electric heating wire. The coordinated adjustment of temperature and pressure allows the system to precisely switch to different temperature and pressure working ranges according to the different stages of the shikonin extraction process. For example, it can achieve cell swelling and cell wall breaking in the low temperature stage, solubilization and mass transfer in the medium temperature and high pressure stage, and desorption and elution in the high temperature and high pressure stage, thereby maximizing extraction efficiency and avoiding degradation of heat-sensitive components.

[0019] 2. The storage mesh frames of this utility model are arranged in a layered and stacked manner, and are suspended in the extraction tank. The heating wire and the spray ring are connected to the inner wall of the extraction tank, and are also sleeved on the outer periphery of the storage mesh frames. The layered and stacked suspended arrangement of the storage mesh frames separates the purple gromwell raw material into multiple independent single layers, avoiding the material compaction and solvent channeling problems caused by traditional stacking methods. Each single layer can fully contact the circulating solvent, increasing the mass transfer area. The heating wire and the spray ring form a surrounding heating and spraying, ensuring that heat and liquid can be evenly transferred from the outside of the material to the inside, eliminating heating dead corners and spraying blind spots.

[0020] 3. The spray ring and spray pipe of this utility model form a double circulation spray path that combines the inside and outside, so that the extract can be sprayed into the material from the outside through the spray ring and sprayed out from the center of the material through the spray pipe, forming a forced penetrating flow field from the center to the outside or from the outside to the center, so as to achieve uniform soaking of the layered material.

[0021] 4. This utility model features a spray pipe with a pressure sleeve connected to its bottom end, and an alignment bottom pipe connected to the bottom of the extraction tank. The alignment bottom pipe is positioned directly above the liquid inlet of the circulation component. The pressure sleeve is movably inserted into the alignment bottom pipe. The pressure sleeve has filter mesh openings, and the alignment bottom pipe has a liquid passage slot. The position between the filter mesh openings and the liquid passage slot is adjustable. The relative sliding of the pressure sleeve and the alignment bottom pipe provides a dual-mode switching function: when the tank lid is closed and extraction is being performed, the filter mesh openings and the liquid passage slot are completely aligned. When the circulation component draws liquid from the bottom of the tank, the liquid must pass through the filter mesh before entering the circulation component. This effectively intercepts drug residue particles to prevent them from entering the spray ring and spray pipe and causing nozzle blockage. At the same time, when the extract is discharged after extraction, the filter mesh also plays an interception role to ensure that clean extract is collected. When the tank lid is opened for internal cleaning, the filter mesh and the liquid passage are completely misaligned and separated. At this time, the cleaning liquid with residue can be discharged directly from the liquid passage without passing through the filter mesh, avoiding cleaning difficulties caused by residue clogging the filter mesh. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of the extraction tank of this utility model;

[0024] Figure 3 This is a schematic diagram of the spray ring, spray pipe, and supporting bottom mesh structure inside the extraction tank of this utility model;

[0025] Figure 4 This is a schematic diagram of the heating wire structure inside the extraction tank of this utility model;

[0026] Figure 5 This is a schematic diagram of the cross-sectional structure of the can lid of this utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the pressure sleeve and the alignment bottom tube of this utility model in a misaligned and separated state;

[0028] Figure 7 This is a schematic diagram of the alignment and overlap of the compression sleeve and the alignment bottom tube of this utility model.

[0029] Figure 8 This is a schematic diagram of the stacked storage mesh frame structure of this utility model;

[0030] Figure 9 This is a schematic diagram of the mesh cover structure of this utility model;

[0031] Figure 10 This is a schematic diagram of the single-layer material storage mesh frame structure of this utility model.

[0032] In the diagram: 1. Extraction tank; 11. Tank lid; 12. Pressurized air inlet pipe; 13. Barometer; 14. Thermometer; 15. Support leg; 16. Connecting rod; 17. Connecting sleeve; 18. Booster pump; 19. Inert gas storage tank; 110. Pressure relief valve; 2. Storage mesh frame; 21. Mesh cover; 22. Positioning rod; 23. Positioning sleeve; 3. Heating wire; 31. Frame rod; 4. Spray ring; 41. Liquid guiding chamber; 42. Side wall spray hole; 5. Spray pipe; 51. Central spray hole; 52. Pressure sleeve; 53. Alignment bottom pipe; 54. Filter mesh; 55. Liquid passage slot; 56. Compression spring; 6. Circulation assembly; 61. Circulation delivery pipe; 62. Circulation pump; 63. Delivery hose; 64. Three-way valve; 7. Support bottom mesh; 71. Limiting block. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Example 1

[0035] like Figures 1 to 10 As shown, a shikonin extraction system includes an extraction tank 1. The extraction tank 1 is equipped with a storage mesh frame 2, a heating wire 3, a spray ring 4, and a spray pipe 5. A tank cover 11 is connected to the upper end of the extraction tank 1, and a pressurizing component is connected to the tank cover 11. The pressure inside the extraction tank 1 is adjustable in stages via the pressurizing component, and the temperature inside the extraction tank 1 is adjustable in stages via the heating wire 3. The storage mesh frame 2, heating wire 3, spray ring 4, and spray pipe 5 integrate multiple functions of material containment, heating, and circulating spraying in the entire extraction process into a single tank. The extraction tank 1 is designed to facilitate the extraction of shikonin under staged temperature and pressure control. The pressure inside the extraction tank 1 is adjustable in stages via a pressurizing component, and the temperature inside the extraction tank 1 is adjustable in stages via a heating wire 3. The coordinated adjustment of temperature and pressure allows the system to precisely switch to different temperature and pressure working ranges according to the different stages of the shikonin extraction process. For example, it can achieve cell swelling and cell wall breaking in the low temperature stage, solubilization and mass transfer in the medium temperature and high pressure stage, and desorption and elution in the high temperature and high pressure stage, thereby maximizing extraction efficiency and avoiding the degradation of heat-sensitive components.

[0036] Multiple storage mesh frames 2 are arranged in a layered, stacked manner and suspended inside the extraction tank 1. The heating wire 3 and the spray ring 4 are connected to the inner wall of the extraction tank 1 and are also fitted around the outer periphery of the storage mesh frames 2. The layered, stacked, suspended arrangement of the storage mesh frames 2 separates the purple gromwell raw material into multiple independent single layers, avoiding the material compaction and solvent channeling problems caused by traditional stacking methods. Each single layer can fully contact the circulating solvent, increasing the mass transfer area. The heating wire 3 and the spray ring 4 form a surrounding heating and spraying system, ensuring that heat and liquid can be evenly transferred from the outside of the material to the inside, eliminating heating dead zones and spraying blind spots.

[0037] The spray pipe 5 is vertically installed inside the extraction tank 1. Both the spray ring 4 and the spray pipe 5 are connected to the circulation component 6. The inlet end of the circulation component 6 is connected to the bottom of the extraction tank 1. The spray ring 4 and the spray pipe 5 form a double circulation spray path that combines the inside and outside, so that the extract can be sprayed into the material from the outside through the spray ring 4 and sprayed out from the center of the material through the spray pipe 5 at the same time. This allows the spray liquid to enter the material from both the outside and the center of the material layer at the same time, forming a multi-directional short circulation inside the material layer, thereby improving the extraction efficiency.

[0038] The bottom end of the spray pipe 5 is connected to a pressure sleeve 52, and the bottom of the extraction tank 1 is connected to an alignment bottom pipe 53. The alignment bottom pipe 53 is located directly above the liquid inlet of the circulation component 6. The pressure sleeve 52 is movably inserted into the alignment bottom pipe 53. The body of the pressure sleeve 52 has a filter screen 54, and the body of the alignment bottom pipe 53 has a liquid passage 55. The position between the filter screen 54 and the liquid passage 55 is adjustable. The relative sliding of the pressure sleeve 52 and the alignment bottom pipe 53 has a dual-mode switching function: when the tank cover 11 is closed and the extraction operation is performed, the filter screen 54 and the liquid passage 55 are in a completely overlapping state. When the circulation component 6 draws liquid from the bottom of the tank, the liquid must pass through the filter mesh 54 before entering the circulation component 6. This effectively intercepts the residue particles to prevent them from entering the spray ring 4 and spray pipe 5 and causing nozzle blockage. At the same time, when the extract is discharged after extraction, the filter mesh 54 also plays an interception role to ensure that clean extract is collected. When the tank lid 11 is opened for tank cleaning, the filter mesh 54 and the liquid passage 55 are completely misaligned and separated. At this time, the cleaning liquid with residue can be discharged directly from the liquid passage 55 without passing through the filter mesh 54, avoiding cleaning difficulties caused by residue clogging the filter mesh 54.

[0039] Example 2

[0040] Improvements based on Example 1:

[0041] like Figures 1 to 4As shown, the pressurization assembly includes a pressurization inlet pipe 12, a pressurization pump 18, and an inert gas storage tank 19. One end of the pressurization inlet pipe 12 is connected to the inside of the tank cover 11, and the other end of the pressurization inlet pipe 12 is connected to the inert gas storage tank 19 via the pressurization pump 18. A barometer 13, a thermometer 14, and a pressure relief valve 110 are also fixed to the tank cover 11. The detection ends of the barometer 13 and the thermometer 14 extend into the inside of the extraction tank 1, and the pressure relief valve 110 is connected to the inside of the extraction tank 1. The design of using inert gas as the pressurization medium can accurately control the pressure inside the tank to the required step setting value, and the inert gas can also replace the air inside the tank, preventing the shikonin from undergoing oxidative degradation under high temperature and high pressure conditions. The pressurization pump 18 enables active and controllable pressure regulation, the barometer 13 is used to display the current pressure value for operator adjustment, and the thermometer 14 is used for... The temperature inside the tank is monitored in real time to ensure that the heating wire 3 can reach the set temperature for each extraction stage, avoiding excessively high temperatures that could lead to thermal degradation of shikonin or excessively low temperatures that could affect extraction efficiency. The pressure relief valve 110 serves as a safety protection device, automatically opening to release pressure when the pressure inside the tank exceeds the set upper limit, preventing safety accidents caused by uncontrolled pressure. The pressure and temperature monitoring components mentioned above work in conjunction with the stepped adjustable temperature and pressure control logic, enabling the system to accurately execute multi-stage temperature and pressure extraction processes. For example, it can maintain normal pressure and a temperature of 40-50°C during the low-temperature swelling stage, increase the pressure to 0.3-0.5MPa and 80-90°C during the medium-temperature solubilization stage, and further increase the pressure to 1.0-1.5MPa and 110-120°C during the high-temperature desorption stage. The pressure and temperature values ​​for each stage can be maintained through the coordinated action of the booster pump 18, the heating wire 3, and the pressure relief valve 110.

[0042] like Figure 1 , Figure 2 , Figures 8 to 10A supporting bottom net 7 is fixed to the inner bottom of the extraction tank 1. The storage mesh frame 2 is mounted on the supporting bottom net 7. Several ring-shaped, equally spaced limiting blocks 71 are fixed to the supporting bottom net 7, and the storage mesh frame 2 abuts against the limiting blocks 71. A mesh cover 21 is provided at the open end of the storage mesh frame 2. Two symmetrically arranged positioning sleeves 23 are connected to the frame body of the storage mesh frame 2. The bottom surface of the mesh cover 21 and the bottom end of the storage mesh frame 2 are both connected to symmetrically arranged positioning rods 22. The mesh cover 21 and its adjacent storage mesh frame 2 are engaged through the positioning rods 22 and the positioning sleeves 23. The two adjacent storage mesh frames 2 are connected by a positioning rod 22 and a positioning sleeve 23. The supporting bottom mesh 7 provides a supporting foundation for the stacked storage mesh frames 2. The limiting block 71 ensures that the multiple stacked storage mesh frames 2 remain in the center position in the tank, avoiding shaking or displacement under the impact of the circulating liquid flow, and ensuring the relative positional accuracy between the spray ring 4 and the spray pipe 5 and the material layer. The positioning rod 22 and the positioning sleeve 23 are connected to realize the rapid stacking and fixing of the storage mesh frames 2, and can form a symmetrical positioning structure to ensure that the storage mesh frames 2 in each layer maintain accurate circumferential alignment.

[0043] like Figure 2 , Figure 3 and Figure 4 As shown, a support rod 31 is fixed between the heating wire 3 and the inner wall of the extraction tank 1. Multiple support rods 31 are spaced apart along the circumference of the extraction tank 1. The heating wire 3 is wound in a spiral structure and sleeved around the outer periphery of the storage mesh frame 2. Multiple sets of heating wire 3 are arranged in layers along the axial direction of the extraction tank 1. Each set of heating wire 3 corresponds to one of the layered storage mesh frames 2. The support rod 31 allows the heating wire 3 to be suspended and wrapped around the outer periphery of the storage mesh frame 2. Heat is directly transferred to the material layer by radiation and convection, resulting in higher thermal efficiency. The spiral arrangement of the heating wire 3 makes the heat distribution more uniform, forming an efficient dynamic heating cycle.

[0044] Furthermore, the spray ring 4 has a liquid guiding cavity 41 inside, and multiple side wall spray holes 42 are opened on the side of the spray ring 4 facing the storage mesh frame 2. The side wall spray holes 42 are all connected to the liquid guiding cavity 41. The spray ring 4 is arranged in three groups at intervals along the axial direction of the extraction tank 1, with each group of spray ring 4 corresponding to the upper, middle and lower parts of the stacked storage mesh frame 2. The liquid guiding cavity 41 of the spray ring 4 is connected to the circulation component 6, and the liquid guiding cavity 41 carries the extract from the circulation component 6. The extract is evenly distributed throughout the ring of the spray ring 4. The side wall spray holes 42 allow the extract to be sprayed radially from the outer periphery of the material to the material layer in the form of liquid flow, forming an all-round enveloping spray effect and achieving forced circulation and soaking of the material. The layered spray ring 4 avoids the disadvantage of uneven spray area of ​​traditional single spray nozzles. Moreover, the spray ring 4 and the central spray pipe 5 form an internal and external coordinated spray distribution, so that the material is simultaneously washed by solvent from both the outer periphery and the center, improving the extraction efficiency of shikonin.

[0045] like Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, the spray pipe 5 is arranged along the central axis of the extraction tank 1. Multiple central spray holes 51 are opened on the side of the spray pipe 5 facing the storage mesh frame 2. The central spray holes 51 are spaced apart along the axial direction of the spray pipe 5 and correspond one-to-one with the layered and stacked storage mesh frames 2. When the circulation component 6 is working, the extract is sprayed radially from the central spray holes 51 of the spray pipe 5, directly impacting the inner ring area of ​​each layer of material. These liquid flows sprayed from the center meet and converge with the liquid flows sprayed from the outer spray ring 4 inside the material layer, forming turbulent flow, so that the material particles are washed by the solvent in all directions, avoiding the shadow area or dead zone that may be generated by unidirectional flow.

[0046] Furthermore, a compression spring 56 is provided between the pressure sleeve 52 and the alignment bottom tube 53, with one end of the compression spring 56 abutting against the shoulder of the pressure sleeve 52 and the other end abutting against the opening of the alignment bottom tube 53; the pressure sleeve 52 slides axially along the alignment bottom tube 53 to adjust the overlapping area of ​​the filter mesh 54 and the liquid passage opening 55. Through the sliding cooperation structure between the pressure sleeve 52 and the alignment bottom tube 53 driven by the compression spring 56, the automatic adjustment of the overlapping area of ​​the filter mesh 54 and the liquid passage opening 55 and the switching between extraction and cleaning modes are realized, ensuring that the circulation component 6 has an anti-clogging function when circulating liquid and has a slag discharge capability when cleaning.

[0047] like Figure 2 As shown, the circulation assembly 6 includes a circulation infusion pipe 61 and a three-way valve 64. One end of the three-way valve 64 serves as the inlet of the circulation assembly 6, connected to the center of the bottom of the extraction tank 1. The other two ends of the three-way valve 64 are outlets. One outlet of the three-way valve 64 is connected to the circulation infusion pipe 61, and the other outlet is connected to an external extraction liquid collection pipeline. The vertical body of the circulation infusion pipe 61 is connected to the tank wall of the extraction tank 1, and the circulation infusion pipe 61 is connected to the liquid guiding chamber 41 of multiple spray rings 4. A delivery hose 63 connects the circulation infusion pipe 61 and the spray pipe 5. A circulation pump 62 is also connected to the pipe body of 61. During the extraction process, the three-way valve 64 is switched to the circulation infusion pipe 61 passage. The liquid at the bottom of the tank enters the circulation infusion pipe 61 through the three-way valve 64 and is then transported to the spray ring 4 and the spray pipe 5 to achieve circulation spraying. After the extraction is completed, the three-way valve 64 is switched to the extract collection pipeline passage. The extract in the tank is directly discharged to the subsequent collection equipment through the three-way valve 64. There is no need to set up an additional drain pump or switch pipelines. The delivery hose 63 connecting the circulation infusion pipe 61 and the spray pipe 5 can adapt to the lifting and lowering displacement of the spray pipe 5 during the opening and closing of the tank cover 11, avoiding the docking difficulties caused by using rigid connections.

[0048] like Figure 1 , Figure 3 and Figure 5 As shown, multiple support feet 15 are fixedly connected circumferentially at intervals at the bottom end of the extraction tank 1. A docking rod 16 is vertically connected to the center of the lower surface of the tank cover 11. A docking sleeve 17 is connected to the bottom end of the docking rod 16. When the tank cover 11 and the extraction tank 1 are in the docking state, the docking sleeve 17 is sleeved on the top of the spray pipe 5. The docking sleeve 17 and the spray pipe 5 adopt a sleeve-type docking, so that when the operator closes the tank cover 11, he only needs to align the tank cover 11 with the extraction tank 1 and put it down, and the docking sleeve 17 can be sleeved on the spray pipe 5. At the top of pipe 5, automatic alignment and connection between the two are achieved, simplifying the operation process. During the closing of the tank cover 11, the pressure sleeve 52 at the bottom of the spray pipe 5 is also aligned and inserted with the bottom alignment tube 53, ensuring that the filter mesh 54 and the liquid passage 55 are in the state of complete overlap required for extraction. When it is necessary to open the tank cover 11 for cleaning, simply lift the tank cover 11, and the connecting sleeve 17 will automatically separate from the spray pipe 5, and the pressure sleeve 52 and the bottom alignment tube 53 will automatically misalign, so as to carry out cleaning and slag removal inside the tank.

[0049] Working principle: First, the raw material of purple gromwell is layered and loaded into multiple storage mesh frames 2. The storage mesh frames 2 are stacked and fixed to form an integral columnar unit by the insertion and cooperation of the positioning rod 22 and the positioning sleeve 23. Then, the can lid 11 is opened and the stacked storage mesh frames 2 are hoisted into the extraction tank 1 and suspended on the support bottom net 7. The storage mesh frames 2 are circumferentially positioned by the limiting block 71. After the can lid 11 is closed, the docking sleeve 17 at the bottom of the docking rod 16 is automatically fitted onto the top of the spray pipe 5 to complete the alignment connection. At the same time, the pressure sleeve 52 at the bottom of the spray pipe 5 is inserted into the alignment bottom tube 53 under the action of the compression spring 56. At this time, the filter mesh 54 and the liquid passage 55 are in a completely overlapping state.

[0050] According to the preset staged extraction process, the pressurization component is activated. The inert gas in the inert gas storage tank 19 is pumped into the extraction tank 1 through the pressurization inlet pipe 12 by the pressurization pump 18, so that the pressure inside the tank reaches the first stage set value. The pressure gauge 13 displays the current pressure value in real time, and the thermometer 14 monitors the temperature inside the tank in real time. At the same time, the heating wire 3 is energized to heat the tank, so that the temperature inside the tank rises stepwise to the temperature required for this stage. After the temperature and pressure conditions reach the predetermined value, the circulation component 6 is activated, and the three-way valve 64 is switched to the circulation delivery pipe 61 passage. The extract at the bottom of the tank enters the circulation delivery pipe 61 through the inlet end of the three-way valve 64. After being pressurized by the circulation pump 62, part of it enters the liquid guiding chamber 41 of multiple spray rings 4 directly through the circulation delivery pipe 61, and then is sprayed radially from the periphery of the material to each layer of storage mesh frame 2 through the side wall spray holes 42. The other part enters the spray pipe 5 through the conveying hose 63 and is sprayed radially from the center of the material along the central spray hole 51, forming a forced circulation flow field that sprays the layered material from the periphery and the center at the same time.

[0051] During the circulating spraying process, the extract drawn from the bottom of the tank must pass through the filter mesh 54 of the pressure sleeve 52 before entering the circulation component 6, effectively intercepting the residue particles to prevent them from entering the spray ring 4 and spray pipe 5 and causing the spray holes to become blocked; when the extraction enters the next stage, the control system readjusts the output of the pressurizing component and the heating wire 3 to switch the temperature and pressure inside the tank to the new set value, and repeats the above circulating spraying process until the entire step extraction procedure is completed;

[0052] After extraction, the three-way valve 64 switches to the external extraction liquid collection pipeline. The extraction liquid in the tank is filtered through the filter screen 54 of the pressure sleeve 52 and then discharged directly through the three-way valve 64 to the subsequent collection equipment. When it is necessary to open the tank cover 11 for tank cleaning, the connecting sleeve 17 automatically separates from the spray pipe 5 after the tank cover 11 is lifted. At this time, the filter screen 54 and the liquid passage 55 are completely misaligned and separated. The cleaning liquid with residue can be discharged smoothly from the liquid passage 55 without passing through the filter screen 54, avoiding cleaning difficulties caused by residue clogging the filter screen 54.

[0053] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0054] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A shikonin extraction system, comprising an extraction tank (1), characterized in that: The extraction tank (1) is provided with a storage mesh frame (2), an electric heating wire (3), a spray ring (4) and a spray pipe (5). The upper end of the extraction tank (1) is connected to a tank cover (11). A pressurizing component is connected to the tank cover (11). The pressure inside the extraction tank (1) is adjustable in steps via the pressurizing component. The temperature inside the extraction tank (1) is adjustable in steps via the electric heating wire (3). The storage mesh frame (2) is arranged in multiple layers and stacked. The storage mesh frame (2) is suspended in the extraction tank (1). The heating wire (3) and the spray ring (4) are connected to the inner wall of the extraction tank (1), and the heating wire (3) and the spray ring (4) are sleeved on the outer periphery of the storage mesh frame (2). The spray pipe (5) is vertically installed inside the extraction tank (1). The spray ring (4) and the spray pipe (5) are both connected to a circulation component (6). The inlet end of the circulation component (6) is connected to the bottom of the extraction tank (1). The bottom end of the spray pipe (5) is connected to a pressure sleeve (52), and the bottom of the extraction tank (1) is connected to an alignment bottom pipe (53). The connection position of the alignment bottom pipe (53) is located directly above the liquid inlet of the circulation component (6). The pressure sleeve (52) is movably inserted into the alignment bottom pipe (53). The tube body of the pressure sleeve (52) is provided with a filter screen (54), and the tube body of the alignment bottom pipe (53) is provided with a liquid passage slot (55). The position between the filter screen (54) and the liquid passage slot (55) is adjustable.

2. The shikonin extraction system according to claim 1, characterized in that: The pressurization assembly includes a pressurization inlet pipe (12), a pressurization pump (18), and an inert gas storage tank (19). One end of the pressurization inlet pipe (12) is connected to the inside of the tank cover (11), and the other end of the pressurization inlet pipe (12) is connected to the inert gas storage tank (19) via the pressurization pump (18). A barometer (13), a thermometer (14), and a pressure relief valve (110) are also fixedly connected to the tank cover (11). The detection ends of the barometer (13) and the thermometer (14) extend into the extraction tank (1), and the pressure relief valve (110) is connected to the inside of the extraction tank (1).

3. The shikonin extraction system according to claim 1, characterized in that: The bottom of the extraction tank (1) is fixed with a support bottom net (7). The storage net frame (2) is erected on the support bottom net (7). Several ring-shaped and equally spaced limiting blocks (71) are fixed on the support bottom net (7). The storage net frame (2) abuts against the limiting blocks (71). The opening end of the storage net frame (2) is equipped with a net cover (21). The frame body of the storage net frame (2) is connected to two symmetrically arranged positioning sleeves (23). The bottom surface of the net cover (21) and the bottom end of the storage net frame (2) are both connected with symmetrically arranged positioning rods (22). The net cover (21) and its adjacent storage net frame (2) are connected by the positioning rods (22) and the positioning sleeves (23). The two adjacent storage net frames (2) are connected by the positioning rods (22) and the positioning sleeves (23).

4. The shikonin extraction system according to claim 1, characterized in that: A support rod (31) is fixed between the heating wire (3) and the inner wall of the extraction tank (1). Multiple support rods (31) are spaced apart along the circumference of the extraction tank (1). The heating wire (3) is wound into a spiral structure and sleeved around the outer periphery of the storage mesh frame (2). Multiple sets of heating wires (3) are arranged in layers along the axial direction of the extraction tank (1). Each set of heating wires (3) corresponds to the layered storage mesh frame (2).

5. The shikonin extraction system according to claim 1, characterized in that: The spray ring (4) has a liquid guiding cavity (41) inside. The spray ring (4) has multiple side wall spray holes (42) on the side facing the storage mesh frame (2). The side wall spray holes (42) are all connected to the liquid guiding cavity (41). The spray ring (4) is arranged in three groups at intervals along the axial direction of the extraction tank (1). Each group of spray rings (4) corresponds to the upper, middle and lower parts of the stacked storage mesh frame (2). The liquid guiding cavity (41) of the spray ring (4) is connected to the circulation component (6).

6. The shikonin extraction system according to claim 1, characterized in that: The spray pipe (5) is arranged along the central axis of the extraction tank (1). Multiple central spray holes (51) are opened on the side of the spray pipe (5) facing the storage mesh frame (2). The central spray holes (51) are arranged at intervals along the axial direction of the spray pipe (5) and correspond one-to-one with the layered and stacked storage mesh frames (2).

7. The shikonin extraction system according to claim 1, characterized in that: A compression spring (56) is provided between the pressure sleeve (52) and the alignment bottom tube (53), and one end of the compression spring (56) abuts against the shoulder of the pressure sleeve (52), and the other end of the compression spring (56) abuts against the opening of the alignment bottom tube (53); the pressure sleeve (52) slides along the axial direction of the alignment bottom tube (53) to adjust the overlapping area of ​​the filter mesh (54) and the liquid passage opening (55).

8. The shikonin extraction system according to claim 6, characterized in that: The circulation assembly (6) includes a circulation infusion pipe (61) and a three-way valve (64). One end of the three-way valve (64) serves as the inlet of the circulation assembly (6) and is connected to the center of the bottom of the extraction tank (1). The other two ends of the three-way valve (64) are outlets. One outlet of the three-way valve (64) is connected to the circulation infusion pipe (61), and the other outlet of the three-way valve (64) is connected to an external extraction liquid collection pipeline. The vertical pipe body of the circulation infusion pipe (61) is connected to the tank wall of the extraction tank (1), and the circulation infusion pipe (61) is connected to the liquid guiding chamber (41) of multiple spray rings (4). A delivery hose (63) is connected between the circulation infusion pipe (61) and the spray pipe (5). A circulation pump (62) is also connected to the pipe body of the circulation infusion pipe (61).

9. The shikonin extraction system according to claim 1, characterized in that: The bottom of the extraction tank (1) is fixed with multiple support feet (15) at circumferential intervals. The center of the lower surface of the tank cover (11) is vertically connected to a docking rod (16). The bottom end of the docking rod (16) is connected to a docking sleeve (17). The docking sleeve (17) is sleeved on the top of the spray pipe (5) when the tank cover (11) and the extraction tank (1) are in the docking state.

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