An apparatus for extracting and purifying natural caffeine from tea

Abstract

The invention discloses a device for extracting and purifying natural caffeine in tea leaves, and belongs to the technical field of food processing. The device comprises a solvent tank, which comprises a conical cavity and a circular cavity that are interconnected; an extraction tube, which is used to contain tea powder to be extracted, wherein the lower end of the extraction tube extends downward into the circular cavity, and the upper end extends upward and is provided with an end cap at the port; an extraction tube, which is arranged on the solvent tank, is hollow inside and is connected to the circular cavity; a plurality of heating plates, which are arranged on the outer wall of the conical cavity; an extraction component, which is arranged at the bottom of the conical cavity and is connected to a conveying pipe, and the extraction component is connected to the purification tank through the conveying pipe; a condenser, which is connected between the extraction tube and the extraction tube, and the condenser is connected to a water pump. Through the present invention, a large amount of solvent can be saved when extracting caffeine. The tea leaves can be fully extracted, and the caffeine content in the solvent can be maximized, avoiding multiple changes of solvent.

Description

Technical Field

[0001] The invention relates to a device for extracting and purifying natural caffeine in tea leaves, belonging to the technical field of food processing. Background Art

[0002] Caffeine is extracted from tea leaves by continuous extraction in a fat extractor using appropriate solvents (chloroform, ethanol, benzene, etc.) and concentrated to obtain crude caffeine. Crude caffeine also contains some other alkaloids and impurities, so after the crude caffeine is concentrated, it needs to be further purified by sublimation.

[0003] Currently, the industry usually uses the immersion method to extract caffeine from tea leaves, but this method often results in the caffeine not being fully dissolved in the solvent, and multiple extractions and repeated additions of large amounts of solvent are required to completely extract the caffeine from a group of tea leaves, resulting in a large amount of solvent waste. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a device for extracting and purifying natural caffeine in tea leaves, which solves the problem that a large amount of solvent is required to extract caffeine in the prior art.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical scheme: a device for extracting and purifying natural caffeine in tea leaves, comprising a solvent tank, the solvent tank comprising a conical cavity and a circular cavity connected to each other; an extraction tube for accommodating tea powder to be extracted, the lower end of the extraction tube extending downward into the circular cavity, the upper end extending upward and provided with an end cover at the port; an extraction tube arranged on the solvent tank, hollow inside and connected to the circular cavity; a plurality of heating plates arranged on the outer wall of the conical cavity; an extraction component arranged at the bottom of the conical cavity and connected to a delivery pipe, the extraction component being connected to a purification tank through the delivery pipe; a condenser connected between the extraction tube and the extraction tube, the condenser being connected to a water pump; wherein the lower end of the extraction tube is closed and connected to a curved delivery channel, the curved delivery channel comprising a first straight section connected to the extraction tube, a second straight section connected to the circular cavity and parallel to the first straight section, and a first curved section connected between the first straight section and the second straight section.

[0006] By adopting the above technical solution, a large amount of solvent can be saved when extracting caffeine. Before extraction, the solubility of caffeine in the solvent and the caffeine content per gram of tea are first determined, so as to reasonably allocate the ratio of solvent to tea. A certain amount of tea is crushed, wrapped with a filter membrane and placed in an extraction tube, and a certain amount of solvent is added to the solvent tank through the extraction tube for initial extraction. After the solvent is added, the solvent in the solvent tank is heated by a heating plate to evaporate the solvent. The evaporated solvent rises along the extraction tube and enters the condenser. After condensation by the condenser, the liquid solvent is re-formed and enters the extraction tube for secondary extraction of the tea. The above steps are repeated to achieve full extraction of the tea, and the caffeine content in the solvent can reach the maximum, avoiding multiple changes of solvent.

[0007] The present invention is further configured as follows: a plurality of drainage holes are distributed on the wall surface of the lower end of the extraction tube, and the inner cavity of the extraction tube is connected with the curved conveying channel through the drainage holes.

[0008] By adopting the above technical solution, the solvent in the extraction tube flows into the curved conveying channel through the drainage hole, and is discharged back into the solvent tank through the curved conveying channel, thereby realizing the recycling of the solvent. The drainage hole can discharge impurities, so that the solvent after soaking the tea leaves can be filtered and returned to the solvent tank in a relatively pure state, thereby reducing the impurity content of the finally extracted caffeine, reducing the difficulty of subsequent purification.

[0009] The present invention is further configured as follows: the suction component includes a suction shell, the upper end opening of the suction shell is connected to the conical cavity, and an opening and closing mechanism is rotatably arranged at the opening, the lower end of the suction shell is provided with a driver, the driver is connected to a driving rod, and the upper end of the driving rod is connected to the opening and closing mechanism.

[0010] By adopting the above technical solution, after the entire extraction cycle is completed, the solvent containing caffeine in the solvent tank can be automatically sucked into the purification tank through the extraction component. Prepare for the next group of extraction. By setting an opening and closing mechanism at the opening, the opening and closing of the extraction component can be controlled autonomously, so that the solution in the solvent tank can be discharged immediately after a single group of tea extraction is completed, which greatly increases the degree of automation of the entire device.

[0011] The present invention is further configured as follows: The opening and closing mechanism includes a cylindrical inner shell with an open bottom end. A plurality of material discharge ports are provided on the upper end surface of the cylindrical inner shell. A plurality of arc-shaped grooves are provided on the inner side of the outer circumferential end surface of the cylindrical inner shell. A plurality of inner baffles are slidably clamped in the arc-shaped grooves. The inner baffles are connected to the driving rods, and the inner baffles are used to block the material discharge ports. Among them, when the inner baffle is driven to rotate by the driving rod, it includes two rotation directions. In the two rotation states, the material discharge ports are respectively in an open state and a closed state.

[0012] By adopting the above technical solution, the material discharge ports on the opening and closing mechanism are opened and closed by the inner baffles. When the inner baffle is driven to rotate clockwise by the driving rod, the material discharge port is in an open state. At this time, the solution in the solvent tank can enter the extraction component through the material discharge port. When the inner baffle is driven to rotate counterclockwise by the driving rod, the material discharge port is blocked by the inner baffle and is in a closed state. By reasonably controlling the rotation angle of the inner baffle, the timing of discharging the solution in the solvent tank can be controlled.

[0013] The present invention is further configured as follows: Scrapers with the same inclination angle as the conical cavity are circumferentially and equidistantly arranged on the cylindrical inner shell, and the scrapers are attached to the inner wall surface of the conical cavity.

[0014] By adopting the above technical solution, by controlling the counterclockwise rotation of the inner baffle, the inner baffle drives the cylindrical inner shell to rotate, so that the scrapers arranged on the cylindrical inner shell can rotate synchronously. Thereby, the solution in the solvent tank can be stirred, so that the solvent in the solvent tank can be heated and evaporated more quickly by the heating plate. The solvent at the bottom can move upward quickly through the agitation of the scraper, accelerating the evaporation of the solvent. At the same time, when discharging is required, since the solvent after extraction contains a large amount of caffeine, it usually adheres to the wall surface of the solvent tank. By controlling the clockwise rotation of the inner baffle, the scraper is driven to rotate clockwise. Since the scraper is attached to the inner wall surface of the conical cavity, the solution adhering to the inner wall surface of the conical cavity can be quickly scraped off, avoiding the adhesion of the solvent to the wall surface and improving the collection rate.

[0015] The present invention is further configured as follows: A diversion groove is provided at the center of the scraper. The diversion groove is communicated with the material discharge port. A plurality of collection grooves are provided on the scraper on one side of the diversion groove. The collection grooves are communicated with the diversion groove. An inclined scraping surface is provided on the side of the scraper where the collection grooves are provided.

[0016] By adopting the above technical solution, the inclined scraping surface can scrape off the solvent adhering to the inner wall of the conical cavity faster during the rotation of the scraper. At the same time, the scraped-off solvent enters the diversion groove through the collection groove and quickly converges at the material discharge port at the bottom of the conical cavity through the diversion of the diversion groove, and enters the extraction component through the material discharge port, thereby greatly improving the collection rate of the solvent.

[0017] The present invention is further configured as follows: a truncated cone cavity is provided at one end of the extraction tube that is connected to the circular cavity, the end of the truncated cone cavity with a larger opening is connected to the circular cavity, a rotating blade is provided in the truncated cone cavity, a driving shaft for driving the rotating blade to rotate is connected to the rotating blade, the other end of the driving shaft is connected to a driving source, and the driving source is provided at the upper end of the extraction tube.

[0018] By adopting the above technical solution, the steam generated after the evaporation of the solvent can be quickly collected in the extraction pipe, and transmitted to the condenser through the extraction pipe for condensation and reflux, thereby improving the steam condensation efficiency, enabling multiple cyclic extractions in a shorter time, and shortening the time required for the entire extraction process.

[0019] The present invention is further configured as follows: both ends of the heating plate are provided with clamping plates, and the solvent tank is provided with a plurality of clamping slots for clamping the clamping plates.

[0020] By adopting the above technical solution, the heating plate is quickly installed on the outer wall of the conical cavity through the clamping plate, which facilitates the assembly of the entire device and facilitates the rapid replacement and maintenance of the heating plate.

[0021] The present invention is further configured as follows: a plurality of support rods are arranged in a circular array on the outer wall of the solvent tank.

[0022] By adopting the above technical solution, the entire solvent tank can be raised by the support rod, which can significantly improve the overall structural strength of the solvent tank. The circular array support rod design increases the load-bearing area and load-bearing capacity of the solvent tank. This allows the solvent tank to safely carry more solvent or other substances without causing structural damage due to excessive weight. The presence of the support rod increases the surface area of ​​the outer wall of the solvent tank, which is conducive to the dissipation of heat, and can more effectively help the solvent tank maintain a suitable operating temperature and prevent solvent deterioration or safety hazards caused by excessive temperature.

[0023] The present invention is further configured as follows: a closing plate is provided at the upper end of the driver, and a flow-guiding arc surface is provided on the closing plate.

[0024] By adopting the above technical solution, the solution flowing into the extraction component can be quickly gathered at the pipe mouth of the delivery pipe. When the solution in the conical cavity enters the extraction component through the discharge port, due to the inclined setting of the guide arc surface, the solution above quickly flows downward under the action of gravity and gathers at the bottom position of the guide arc surface. The delivery pipe is connected to the bottom position of the guide arc surface, so the solution can be quickly collected and transported to the purification tank through the delivery pipe for the next step of purification.

[0025] The beneficial effects of the present invention are as follows: By providing an extraction tube in cooperation with a suction tube, the solvent can be used more efficiently to dissolve caffeine in tea, improving the utilization efficiency of the solvent and reducing the waste of the solvent.

[0026] Through the provision of the extraction component and the opening and closing mechanism, the solution dissolving caffeine can be quickly collected into the purification tank, and the situation where a large amount of solution adheres to the inner wall of the conical cavity and is difficult to discharge can be prevented, improving the collection efficiency of the solution. At the same time, by rotating the scraper, the mixed solution in the conical cavity can be stirred during the extraction process, improving the evaporation efficiency of the internal solvent. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0028] Figure 2 is a side view of the present invention;

[0029] Figure 3 is the Figure 2 cross-sectional view in the A direction of the present invention;

[0030] Figure 4 is a three-dimensional structural schematic diagram of the opening and closing mechanism of the present invention from a top-down perspective;

[0031] Figure 5 is a three-dimensional structural schematic diagram of the opening and closing mechanism of the present invention from a bottom-up perspective.

[0032] In the figure: 1, solvent tank; 101, conical cavity; 102, circular cavity; 2, extraction tube; 201, drain hole; 3, suction tube; 301, frustum cavity; 302, rotating blade; 303, drive shaft; 304, drive source; 4, heating plate; 401, clamping plate; 5, extraction component; 501, extraction housing; 502, driver; 503, drive rod; 504, closing plate; 505, guiding arc surface; 6, conveying pipe; 7, purification tank; 8, curved conveying channel; 801, first straight section; 802, second straight section; 803, first curved section; 9, opening and closing mechanism; 901, cylindrical inner shell; 902, discharge port; 903, inner baffle; 904, scraper; 905, guiding groove; 906, collecting groove; 907, inclined scraping surface; 908, arc groove; 9081, limiting block; 909, arc-shaped clamping block; 10, support rod; 11, water pump; 12, condenser; 13, end cover; 14, handle; 15, pressure pump. DETAILED DESCRIPTION OF THE INVENTION

[0033] In order to make it easy to understand the technical means, creative features, achieved purposes and effects of the present invention, the present invention will be further described below with reference to specific illustrations.

[0034] As Figures 1-3As shown, a natural caffeine extraction and purification device in tea leaves comprises a solvent tank 1, wherein the solvent tank 1 comprises a conical cavity 101 and a circular cavity 102 which are interconnected; an extraction tube 2, which is used to accommodate tea powder to be extracted, wherein the lower end of the extraction tube 2 extends downward into the circular cavity 102, and the upper end extends upward and is provided with an end cover 13 at the port; an extraction tube 3, which is arranged on the solvent tank 1, is hollow inside and is connected to the circular cavity 102; a plurality of heating plates 4, which are arranged on the outer wall of the conical cavity 101; an extraction component 5, which is arranged at the bottom of the conical cavity 101 and is connected to a delivery pipe 6, wherein the extraction component 5 is connected to a purification tank 7 via the delivery pipe 6; and a condenser 12, wherein the condenser 12 is specifically a condenser tube, wherein the condenser 12 is connected between the extraction tube 2 and the extraction tube 3, and wherein the condenser 12 is connected to a water pump 11.

[0035] During the extraction process, firstly, a proper amount of tea leaves are put into the extraction tube 2. The tea leaves need to be ground before being put in, and the ground tea leaves are wrapped with filter cloth before being put into the extraction tube 2. A solvent is added to the extraction tube 2. After the solvent is added to the extraction tube 2, the tea leaves are initially extracted and dissolved, and part of the caffeine in the tea leaves is taken away. The solvent with dissolved caffeine enters the conical cavity 101 through the extraction tube 2, and it is ensured that the total amount of solvent does not exceed the highest liquid level of the conical cavity 101, that is, it is prevented from being added too much and rising to the circular cavity 102 connected to the conical cavity 101. The solvent is heated and evaporated by the heating plate 4 in the conical cavity 101. The evaporated solvent enters the condenser 12 through the extraction tube 3, and is recondensed into liquid under the action of the condenser 12. It flows back to the extraction tube 2 through the condenser 12, and the tea leaves in the extraction tube 2 are extracted twice. The above steps are repeated until the caffeine in the tea leaves in the extraction tube 2 is completely dissolved, and the extraction of caffeine in a single group of tea leaves is completed. The mixed solution containing caffeine in the conical cavity 101 is transported to the purification tank 7 for heating and purification through the extraction component 5. At the same time, the end cover 13 on the extraction tube 2 is opened, the extracted tea leaves are taken out, new tea leaves are added, and a certain proportion of solvent is added again to extract the second group of tea leaves.

[0036] By setting the solvent tank 1, in coordination with the extraction tube 2 and the extraction tube 3, the extraction solvent can be efficiently utilized, so that the caffeine can be fully absorbed and taken away by the solvent, thereby reducing the amount of solvent used, improving the utilization efficiency of the solvent, and saving the extraction cost.

[0037] Furthermore, the lower end of the extraction tube 2 is closed and connected to a curved delivery channel 8, which includes a first straight section 801 connected to the extraction tube 2, a second straight section 802 connected to the circular cavity 102 and parallel to the first straight section 801, and a first curved section 803 connected between the first straight section 801 and the second straight section 802.

[0038] Through the setting of the curved conveying channel 8, when the solvent is added to the extraction tube 2, the solvent will not immediately flow into the conical cavity 101. Instead, it will converge in the extraction tube 2. When it converges to a certain height, due to the pressure difference effect, the liquid level of the solvent in the extraction tube 2 continuously rises, causing the height of the solvent in the second straight section 802 to continuously increase. When it rises to the highest point of the second straight section 802, it enters the first straight section 801 through the first curved section 803, forming a siphon effect, so that the solvent in the extraction tube 2 is immediately sucked into the conical cavity 101 to complete a single cycle. Subsequently, the solvent entering the extraction tube 2 converges again, and when it reaches a certain height, it is sucked into the conical cavity 101 again.

[0039] Through the setting of the curved conveying channel 8, the solvent added to the extraction tube 2 can be more fully dissolved with the tea leaves, improving the single dissolution rate of caffeine and enabling the tea leaves to be more fully soaked and dissolved. With the circular ring-shaped curved conveying channel 8, the overall siphon speed of the solvent and the height of the solution that can converge in the extraction tube 2 are increased, so that more tea leaves can be extracted at one time.

[0040] Furthermore, small drainage holes 201 are densely distributed on the lower end wall surface of the extraction tube 2, forming a funnel at the lower end of the extraction tube 2, and the lower end surface of the extraction tube 2 is closed. The solvent enters the second straight section 802 through the drainage holes 201 on the wall surface. Through the drainage holes 201, the solvent can be further filtered to prevent impurities in the solvent from entering the curved conveying channel 8 or the conical cavity 101, preventing the curved channel from being blocked by impurities and improving the solubility of the solvent entering the conical cavity 101.

[0041] As Figure 3 shown, the extraction assembly 5 includes an extraction housing 501. The upper end opening of the extraction housing 501 is communicated with the conical cavity 101, and an opening and closing mechanism 9 is rotatably arranged at the opening. A driver 502 is arranged at the lower end of the extraction housing 501. The driver 502 is specifically a motor, and the driver 502 is connected with a driving rod 503. The upper end of the driving rod 503 is connected with the opening and closing mechanism 9.

[0042] The extraction housing 501 is arranged at the bottom of the conical cavity 101. When it is necessary to drain the solution in the conical cavity 101, by controlling the extraction assembly 5, the solution in the conical cavity 101 can be quickly absorbed. The solution in the conical cavity 101 can naturally converge to the bottom position of the conical cavity 101 under the action of gravity, thereby improving the collection efficiency of the solution. Through the extraction assembly 5, the mixed solution after extraction can be transported to the purification tank 7 for the next purification step.

[0043] By driving the driving rod 503 to rotate through the driver 502, the opening and closing mechanism 9 is driven to rotate. Specifically, as Figure 4 andFigure 5 As shown, the opening and closing mechanism 9 includes a cylindrical inner shell 901 with an opening. On one surface inside the cylindrical inner shell 901, a number of material discharge ports 902 are arrayed. In this embodiment, the number of material discharge ports 902 is three, and their shapes are as Figure 4 and Figure 5 shown, being fan-shaped.

[0044] As Figure 5 shown, on the inner side of the surface of the cylindrical inner shell 901 where the material discharge ports 902 are provided, at the position connected to the side wall of the cylindrical inner shell 901, three arc-shaped grooves 908 are opened, and the three arc-shaped grooves 908 are not connected to each other. Each arc-shaped groove 908 is separated by a limiting block 9081. At the same time, three inner baffles 903 with interconnected centers are attached to the inner side of the surface where the material discharge ports 902 are provided, and the center of the inner baffle 903 is connected to the driving rod 503. Among them, the shape of the inner baffle 903 is the same as that of the fan-shaped material discharge port 902. An arc-shaped plate extends from the outer circle of the inner baffle 903 towards the end face direction. After the inner baffle 903 is attached to the cylindrical inner shell 901, the arc-shaped plate is clamped in the arc-shaped groove 908.

[0045] The entire opening and closing mechanism 9 can operate in cooperation with the extraction assembly 5. The driving rod 503 is driven to rotate by the driver 502, and then the inner baffle 903 is driven to rotate. When the inner baffle 903 rotates, the arc-shaped plate slidably arranged in the arc-shaped groove 908 rotates in the arc-shaped groove 908. When it rotates to the position of the limiting block 9081, due to the limitation of the limiting block 9081, the inner baffle 903 will drive the entire cylindrical inner shell 901 to rotate. As Figure 5 shown, when the inner baffle 903 rotates clockwise, it does not coincide with the material discharge port 902. Therefore, the material discharge port 902 is in an open state. At this time, the mixed solution in the conical cavity 101 can quickly enter the extraction outer shell 501 through the material discharge port 902, and the solution is transported to the purification tank 7 through the extraction assembly 5 for purification. When the inner baffle 903 rotates counterclockwise, at this time, the inner baffle 903 coincides with the material discharge port 902, and the inner baffle 903 closes the material discharge port 902. At this time, the solution in the conical cavity 101 cannot enter the extraction outer shell 501 through the material discharge port 902.

[0046] By controlling the rotation direction of the inner baffle 903, the opening and closing of the material discharge port 902 are further controlled, thereby realizing the control of the timing of solvent discharge. It can prevent blockage during material discharge. When the mixed solution in the extraction outer shell 501 accumulates more, by rotating the inner baffle 903 in the reverse direction to close the material discharge port 902, the discharge speed of the solution can be controlled.

[0047] Further, three scraping plates 904 are arrayed on the cylindrical inner shell 901, and the scraping plates 904 extend upward into the conical cavity 101. The inclination angle of the scraping plates 904 is the same as that of the conical cavity 101, and the lower surface of the scraping plates 904 is in mutual contact with the inner wall of the conical cavity 101.

[0048] When the inner baffle 903 rotates counterclockwise, it can drive the cylindrical inner shell 901 to rotate, causing the scraping plates 904 to rotate in the conical cavity 101, thereby agitating the mixed solution in the conical cavity 101 and accelerating the evaporation of the solvent in the mixed solution.

[0049] Further, a diversion groove 905 is provided at the center of the scraping plate 904. The diversion groove 905 is in communication with the blanking port 902. A number of collection grooves 906 are provided on the scraping plate 904 on one side of the diversion groove 905. The collection grooves 906 are in communication with the diversion groove 905. An inclined scraping surface 907 is provided on the side of the scraping plate 904 where the collection grooves 906 are provided.

[0050] When the scraping plate 904 rotates clockwise along with the extraction outer shell 501, by agitating the mixed solution in the conical cavity 101, the mixed solution in the conical cavity 101 is driven to rotate, converging into a vortex in the center, thereby accelerating the discharge speed of the solution. Since the solvent becomes relatively viscous after dissolving a large amount of caffeine, it is easy to adhere to the inner wall of the conical cavity 101 and is difficult to flow downward immediately under the action of gravity. Therefore, when the scraping plate 904 rotates counterclockwise, the side with the inclined scraping surface 907 will scrape against the inner wall of the conical cavity 101, causing the mixed solution adhering to the inner wall of the conical cavity 101 to be scraped off by the scraping plate 904, flowing through the collection grooves 906 to the diversion groove 905, and finally flowing downward to the blanking port 902 under the diversion of the diversion groove 905.

[0051] Through the setting of the scraping plate 904, when rotating clockwise, it can effectively clean the solution adhering to the inner wall of the conical cavity 101 and improve the collection rate of the solution. When rotating counterclockwise, it can agitate the solution in the entire conical cavity 101, so that the solvent containing a higher amount of caffeine flowing into the conical cavity 101 later can be quickly mixed with the solvent in the conical cavity 101, thereby improving the evaporation efficiency of the solvent, shortening the time of the entire extraction cycle, and saving time for the entire extraction process.

[0052] As Figure 3 shown, at one end of the extraction tube 3 communicating with the circular cavity 102, a frustum-shaped cavity 301 is provided. The end with a larger opening of the frustum-shaped cavity 301 is in communication with the circular cavity 102. A rotating blade 302 is provided in the frustum-shaped cavity 301. A drive shaft 303 for driving its rotation is connected to the rotating blade 302. The other end of the drive shaft 303 is connected to a drive source 304. The drive source 304 is specifically a motor, and the drive source 304 is provided at the upper end of the extraction tube 3.

[0053] The rotary blade 302 is driven to rotate by the driving source 304, so that the gaseous solvent converging in the circular cavity 102 after evaporation can quickly enter the extraction tube 3 through the frustum cavity 301 and enter the condenser 12 through the extraction tube 3. By arranging the rotary blade 302, the flow rate of the evaporated gas in the circular cavity 102 can be increased, preventing the evaporated solvent from re-condensing due to its slow rising speed and improving the efficiency of the entire cycle.

[0054] As Figure 2 shown, the number of heating plates 4 is three. Clamping plates 401 are arranged at both ends of the heating plate 4, and a number of card slots for clamping the clamping plates 401 are arranged on the solvent tank 1. The heating plate 4 is quickly clamped to the outer wall of the conical cavity 101 through the card slots, thus realizing the quick installation and disassembly of the heating plate 4.

[0055] Specifically, on the outer wall surface of the solvent tank 1, at the upper and lower positions of the outer wall of the conical cavity 101, three card slots are arranged, and the same length of insertion openings are left between each card slot.

[0056] When installing the heating plate 4, first align the heating plate 4 with the insertion opening position, so that the clamping plate 401 on the heating plate 4 is inserted into the insertion opening. By rotating the heating plate 4, the clamping plate 401 is inserted into the card slot. When the clamping plate 401 is completely rotated into the card slot, the installation of a single heating plate 4 is completed.

[0057] Furthermore, a grip 14 is installed on the heating plate 4. Through the grip 14, the heating plate 4 can be moved and installed better. It is convenient for the staff to hold the heating plate 4. And the heating plate 4 is externally connected to a heating power supply. Specifically, the heating plate 4 is a heating resistance wire inside. After passing through the heating resistance, heat is generated and conducted to the inner wall of the conical cavity 101, thereby heating the mixed solution inside the conical cavity 101, so that the solvent quickly evaporates into water vapor and then reflows into the extraction tube 2.

[0058] As Figure 1 shown, at the upper end face position of the conical cavity 101 on the outer wall of the solvent tank 1, three support rods 10 extend outwards. The entire solvent tank 1 is supported by the support rods 10. The design of the circumferentially arrayed support rods 10 increases the load-bearing area and load-bearing capacity of the solvent tank 1. This enables the solvent tank 1 to safely carry more solvents or other substances without structural damage due to excessive weight. The presence of the support rods 10 increases the surface area of the outer wall of the solvent tank 1, which is beneficial to heat dissipation and can more effectively help the solvent tank 1 maintain an appropriate working temperature, preventing solvent deterioration or safety hazards caused by excessive temperature.

[0059] Furthermore, a closing plate 504 is arranged at the upper end of the driver 502, and a diversion arc surface 505 is arranged on the closing plate 504.

[0060] The solvent flowing into the suction housing 501 can be prevented from flowing onto the driver 502 through the closing plate 504, thus damaging the driver 502.

[0061] Through the setting of the diversion arc surface 505, the solution flowing into the suction assembly 5 can be quickly converged at the nozzle of the delivery pipe 6. When the solution in the conical cavity 101 enters the suction assembly 5 through the blanking port 902, due to the inclined setting of the diversion arc surface 505, the solution above quickly flows downward under the action of gravity and converges at the bottom position of the diversion arc surface 505. And the delivery pipe 6 is connected to the bottom position of the diversion arc surface 505. Therefore, the solution can be quickly collected and transported to the purification tank 7 through the delivery pipe 6 for the next purification step.

[0062] Further, a pressure pump 15 is provided on the delivery pipe 6 connected to the suction assembly 5. Through the pressure pump 15, the solvent in the suction housing 501 can be quickly pumped into the purification tank 7.

[0063] The above has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope claimed by the present invention. The scope claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for extracting and purifying natural caffeine in tea, characterized in that: include: A solvent tank (1), the solvent tank (1) comprising a conical cavity (101) and a circular cavity (102) which are connected to each other; An extraction tube (2) for containing tea powder to be extracted, the lower end of the extraction tube (2) extending downward into the circular cavity (102); An extraction tube (3) is arranged on the solvent tank (1), is hollow inside and is in communication with the circular cavity (102); A plurality of heating plates (4) arranged on the outer wall of the conical cavity (101); An extraction component (5) is disposed at the bottom of the conical cavity (101) and is connected to the purification tank (7); A condenser (12) connected between the extraction tube (2) and the extraction tube (3); The lower end of the extraction tube (2) is closed and connected to a curved delivery channel (8), the curved delivery channel (8) comprising a first straight section (801) connected to the extraction tube (2), a second straight section (802) connected to the circular cavity (102) and parallel to the first straight section (801), and a first curved section (803) connected between the first straight section (801) and the second straight section (802); A plurality of drainage holes (201) are distributed on the wall surface of the lower end of the extraction tube (2), and the inner cavity of the extraction tube (2) is connected to the curved conveying channel (8) through the drainage holes (201); The pumping assembly (5) comprises a pumping shell (501), the upper end opening of the pumping shell (501) is in communication with the conical cavity (101), and an opening and closing mechanism (9) is rotatably arranged at the opening, the lower end of the pumping shell (501) is provided with a driver (502), the driver (502) is connected to a driving rod (503), and the upper end of the driving rod (503) is connected to the opening and closing mechanism (9); The opening and closing mechanism (9) comprises a cylindrical inner shell (901) with an opening at the lower end, a plurality of material discharge ports (902) being arranged on the upper end surface of the cylindrical inner shell (901), a plurality of arc-shaped grooves (908) being arranged on the inner side of the outer circular end surface of the cylindrical inner shell (901), a plurality of inner baffles (903) being slidably engaged in the arc-shaped grooves (908), the inner baffles (903) being connected to the driving rod (503), and the inner baffles (903) being used to block the material discharge ports (902); Wherein, when the inner baffle (903) is driven to rotate by the driving rod (503), there are two rotation directions, and in the rotation states in the two directions, the feed opening (902) is respectively in an open state and a closed state; Scrapers (904) are equidistantly arranged on the circumference of the cylindrical inner shell (901) at the same inclination angle as the conical cavity (101), and the scrapers (904) are fitted to the inner wall surface of the conical cavity (101).

2. The device for extracting and purifying natural caffeine in tea leaves according to claim 1, characterized in that: A guide groove (905) is provided at the center of the scraper (904), the guide groove (905) and the discharge port (902) are connected to each other, a plurality of collecting grooves (906) are provided on the scraper (904) on one side of the guide groove (905), the collecting grooves (906) and the guide groove (905) are connected to each other, and an inclined scraping surface (907) is provided on one side of the scraper (904) on which the collecting grooves (906) are provided.

3. The device for extracting and purifying natural caffeine in tea leaves according to claim 1, characterized in that: A truncated cone cavity (301) is provided at one end of the extraction tube (3) that is in communication with the circular cavity (102); the end of the truncated cone cavity (301) with a larger opening is in communication with the circular cavity (102); a rotating blade (302) is provided in the truncated cone cavity (301); a driving shaft (303) for driving the rotating blade (302) is connected to the rotating blade (302); the other end of the driving shaft (303) is connected to a driving source (304); the driving source (304) is provided at the upper end of the extraction tube (3).

4. The device for extracting and purifying natural caffeine in tea leaves according to claim 1, characterized in that: Both ends of the heating plate (4) are provided with clamping plates (401), and the solvent tank (1) is provided with a plurality of clamping slots for clamping the clamping plates (401).

5. The device for extracting and purifying natural caffeine in tea leaves according to claim 1, characterized in that: A plurality of support rods (10) are arranged in a circumferential array on the outer wall of the solvent tank (1).

6. The device for extracting and purifying natural caffeine in tea leaves according to claim 1, characterized in that: A closing plate (504) is provided at the upper end of the driver (502), and a flow-guiding cambered surface (505) is provided on the closing plate (504).

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