Device for extracting and purifying natural caffeine in tea leaves

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, wherein the solvent tank comprises a conical cavity and a circular cavity which are communicated with each other; the extraction tube is used for containing tea powder to be extracted, the lower end of the extraction tube extends downwards into the circular cavity, the upper end of the extraction tube extends upwards, and an end cover is arranged at an end opening of the extraction tube; the extraction pipe is arranged on the solvent tank, is hollow and is communicated with the circular cavity; the heating plates are arranged on the outer wall of the conical cavity; the drawing assembly is arranged at the bottom of the conical cavity and connected with a conveying pipe, and the drawing assembly is connected with the purification tank through the conveying pipe; the condenser is connected between the extraction pipe and the extraction pipe, and the condenser is connected with a water pump. By means of the caffeine extraction device, a large amount of solvent can be saved during caffeine extraction. The tea leaves are fully extracted, the caffeine content in the solvent can reach the maximum, and repeated replacement of the solvent is avoided.

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 comprises a cylindrical inner shell with an opening at the lower end, a plurality of feed openings are arranged on the upper end surface of the cylindrical inner shell, a plurality of arc grooves are arranged on the inner side of the outer circular end surface of the cylindrical inner shell, a plurality of inner baffles are slidably engaged in the arc grooves, the inner baffles are connected to the driving rod, and the inner baffles are used to block the feed openings; wherein, when the inner baffle is driven to rotate by the driving rod, it includes two rotation directions, and in the rotation states in the two directions, the feed opening is respectively in an open and closed state and a closed state.

[0012] By adopting the above technical solution, the discharge port on the opening and closing mechanism is opened and closed by the inner baffle. When the inner baffle is driven by the driving rod to rotate clockwise, the discharge port is in an open state, and the solution in the solvent tank can enter the extraction component through the discharge port. When the inner baffle is driven by the driving rod to rotate counterclockwise, the 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 discharge timing of 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 equidistantly arranged on the circumference of the cylindrical inner shell, and the scrapers are fitted to the inner wall surface of the conical cavity.

[0014] By adopting the above technical solution, the inner baffle is controlled to rotate counterclockwise, and the inner baffle drives the cylindrical inner shell to rotate, so that the scraper set on the cylindrical inner shell can rotate synchronously, so that 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, and the solvent at the bottom can move upward quickly through the stirring of the scraper, thereby accelerating the evaporation of the solvent. At the same time, when it is necessary to discharge the material, the solvent after extraction usually adheres to the wall of the solvent tank because it contains a large amount of caffeine. By controlling the rotation of the inner baffle clockwise, the scraper is driven to rotate clockwise. Since the scraper fits the inner wall of the conical cavity, the solution attached to the inner wall of the conical cavity can be quickly scraped off, avoiding the solvent from adhering to the wall, thereby improving the collection rate.

[0015] The present invention is further configured as follows: a guide groove is provided in the center of the scraper, the guide groove is communicated with the discharge port, a plurality of collecting grooves are provided on the scraper on one side of the guide groove, the collecting grooves are communicated with the guide groove, and an inclined scraping surface is provided on the side of the scraper where the collecting groove is provided.

[0016] By adopting the above technical solution, the inclined scraping surface can scrape off the solvent attached to the inner wall of the conical cavity more quickly during the rotation of the scraper. At the same time, the scraped solvent passes through the collection groove and enters the guide groove. Through the guidance of the guide groove, it quickly converges at the discharge port at the bottom of the conical cavity and enters the suction component through the discharge port, thereby greatly improving the solvent collection rate.

[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 effect of the present invention is that by arranging the extraction tube in combination with the extraction tube, the caffeine in the tea leaves can be dissolved by the solvent more efficiently, the utilization efficiency of the solvent is improved, and the waste of the solvent is reduced.

[0026] By setting up the extraction component and the opening and closing mechanism, the solution containing dissolved caffeine can be quickly collected into the purification tank, and a large amount of solution can be prevented from adhering to the inner wall of the conical cavity and being difficult to discharge, thereby 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, thereby improving the evaporation efficiency of the internal solvent. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 is a side view of the present invention; Figure 3 For the present invention Figure 2 Cross-sectional view in the direction of A; Figure 4 It is a schematic diagram of the three-dimensional structure of the opening and closing mechanism of the present invention from a top view; Figure 5 It is a schematic diagram of the three-dimensional structure of the opening and closing mechanism of the present invention when viewed from a bottom angle.

[0028] In the figure: 1, solvent tank; 101, conical cavity; 102, circular cavity; 2, extraction tube; 201, drainage hole; 3, extraction tube; 301, truncated cone cavity; 302, rotating blade; 303, driving shaft; 304, driving source; 4, heating plate; 401, card plate; 5, extraction component; 501, extraction shell; 502, driver; 503, driving rod; 504, closing plate; 505, guide arc surface; 6, conveying pipe; 7, purification tank; 8, curved conveying channel 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, guide groove; 906, collecting groove; 907, inclined scraping surface; 908, arc groove; 9081, limit block; 909, arc block; 10, support rod; 11, water pump; 12, condenser; 13, end cover; 14, handle; 15, pressure pump. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0030] like Figure 1-Figure 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] By setting the curved delivery channel 8, when the solvent is added to the extraction tube 2, the solvent will not flow into the conical cavity 101 immediately, but will gather in the extraction tube 2. When it gathers to a certain height, due to the pressure difference effect, the liquid level of the solvent in the extraction tube 2 continues to rise, so that the height of the solvent in the second straight section 802 continues to rise. 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, completing a single cycle, and the solvent that subsequently enters the extraction tube 2 is re-converged and is sucked into the conical cavity 101 again after reaching a certain height.

[0035] By setting the curved delivery channel 8, the solvent added to the extraction tube 2 can be more fully dissolved with the tea leaves, thereby improving the single dissolution rate of caffeine, so that the tea leaves can be more fully soaked and dissolved. The circular ring-shaped curved delivery channel 8 increases the overall siphoning speed of the solvent and the height of the solution that can be gathered in the extraction tube 2, so that more tea leaves can be extracted at a time.

[0036] Furthermore, fine drainage holes 201 are densely distributed on the wall surface of the lower end of the extraction tube 2, so that a funnel is formed at the lower end of the extraction tube 2, and the lower end surface of the extraction tube 2 is closed, and 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 delivery channel 8 or the tapered cavity 101, and the impurities can be prevented from clogging the curved channel, thereby improving the solubility of the solvent entering the tapered cavity 101.

[0037] like Figure 3 As shown, the suction component 5 includes a suction shell 501, the upper end opening of the suction shell 501 is connected to the conical cavity 101, and an opening and closing mechanism 9 is rotatably arranged at the opening, and a driver 502 is arranged at the lower end of the suction shell 501, and the driver 502 is specifically a motor. 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.

[0038] The extraction housing 501 is arranged at the bottom of the conical cavity 101. When the solution in the conical cavity 101 needs to be discharged, the solution in the conical cavity 101 can be quickly absorbed by controlling the extraction component 5. The solution in the conical cavity 101 can naturally gather to the bottom of the conical cavity 101 under the action of gravity, thereby improving the collection efficiency of the solution. The mixed solution after extraction can be transported to the purification tank 7 through the extraction component 5 for the next purification.

[0039] The driver 502 drives the driving rod 503 to rotate, thereby driving the opening and closing mechanism 9 to rotate. Figure 4 and Figure 5 As shown, the opening and closing mechanism 9 includes a cylindrical inner shell 901 with an opening, and a plurality of material discharge ports 902 are arranged on one side of the cylindrical inner shell 901. In this embodiment, the number of the material discharge ports 902 is three, and their shapes are as follows: Figure 4 and Figure 5 As shown, it is fan-shaped.

[0040] like Figure 5 As shown, on the inner side of one side of the cylindrical inner shell 901 provided with the discharge port 902, three arc grooves 908 are provided at the position connected to the side wall of the cylindrical inner shell 901, and the three arc grooves 908 are not connected to each other, and each arc groove 908 is separated by a stop block 9081. At the same time, three inner baffles 903 connected to each other at the center are attached to the inner side of the side provided with the discharge port 902, 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 equal to the shape of the fan-shaped discharge port 902, and the outer ring of the inner baffle 903 extends an arc plate toward the end surface, and the arc plate is clamped in the arc groove 908 after the inner baffle 903 is attached to the cylindrical inner shell 901.

[0041] The entire opening and closing mechanism 9 can work together with the suction assembly 5, and the driver 502 drives the driving rod 503 to rotate, thereby driving the inner baffle 903 to rotate. When the inner baffle 903 rotates, the arc plate slidably set in the arc groove 908 rotates in the arc groove 908. When it rotates to the position of the limit block 9081, due to the restriction of the limit block 9081, the inner baffle 903 will drive the entire cylindrical inner shell 901 to rotate. Figure 5 As shown, when the inner baffle 903 rotates clockwise, it does not overlap with the feed opening 902, so the feed opening 902 is in an open state, and the mixed solution in the conical cavity 101 can quickly enter the suction housing 501 through the feed opening 902, and the solution is transported to the purification tank 7 for purification through the suction component 5. When the inner baffle 903 rotates counterclockwise, the inner baffle 903 overlaps with the feed opening 902, and the inner baffle 903 closes the feed opening 902, and the solution in the conical cavity 101 cannot enter the suction housing 501 through the feed opening 902.

[0042] By controlling the rotation direction of the inner baffle 903, the opening and closing of the discharge port 902 is controlled, so as to control the timing of solvent discharge. This can prevent blockage during discharge. When a large amount of mixed solution in the suction housing 501 is collected, the inner baffle 903 is rotated in the opposite direction to close the discharge port 902, so as to control the discharge speed of the solution.

[0043] Furthermore, three scrapers 904 are arrayed on the cylindrical inner shell 901 , and the scrapers 904 extend upward into the conical cavity 101 , and the inclination angle of the scrapers 904 is the same as the inclination angle of the conical cavity 101 , and the lower surface of the scrapers 904 fits against the inner wall of the conical cavity 101 .

[0044] When the inner baffle 903 rotates counterclockwise, it can drive the cylindrical inner shell 901 to rotate so that the scraper 904 rotates in the conical cavity 101, thereby stirring the mixed solution in the conical cavity 101 and accelerating the evaporation of the solvent in the mixed solution.

[0045] Furthermore, a guide groove 905 is provided at the center of the scraper 904, and the guide groove 905 is connected to the discharge port 902. A plurality of collecting grooves 906 are provided on the scraper 904 on one side of the guide groove 905, and the collecting grooves 906 are connected to the guide groove 905. An inclined scraping surface 907 is provided on the side of the scraper 904 where the collecting grooves 906 are provided.

[0046] When the scraper 904 rotates clockwise with the extraction shell 501, the mixed solution in the conical cavity 101 is stirred, so that the mixed solution in the conical cavity 101 is driven to rotate and converges into a vortex in the center, thereby accelerating the discharge speed of the solution. Since the solvent itself 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 it is difficult to immediately flow downward under the action of gravity. Therefore, when the scraper 904 rotates counterclockwise, the side with the inclined scraping surface 907 will scrape relative to the inner wall of the conical cavity 101, so that the mixed solution adhering to the inner wall of the conical cavity 101 can be scraped off by the scraper 904, flow through the collection groove 906 to the guide groove 905, and finally flow to the lower feed port 902 under the guidance of the guide groove 905.

[0047] By setting the scraper 904, when it rotates clockwise, the solution attached to the inner wall of the conical cavity 101 can be effectively cleaned, thereby improving the collection rate of the solution. When it rotates counterclockwise, the solution in the entire conical cavity 101 can be stirred, so that the solvent containing a higher amount of caffeine that flows 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.

[0048] like Figure 3 As shown, a truncated cone cavity 301 is provided at one end of the extraction tube 3 which is connected to the circular cavity 102, and a larger opening of the truncated cone cavity 301 is connected to the circular cavity 102. A rotating blade 302 is provided in the truncated cone cavity 301, and a driving shaft 303 for driving the rotating blade 302 is connected to the rotating blade 302, and a driving source 304 is connected to the other end of the driving shaft 303, and the driving source 304 is specifically a motor, and the driving source 304 is arranged at the upper end of the extraction tube 3.

[0049] The driving source 304 drives the rotating blades 302 to rotate, so that the gaseous solvent gathered in the circular cavity 102 after evaporation can quickly enter the extraction pipe 3 through the truncated cone cavity 301, and enter the condenser 12 through the extraction pipe 3. By providing the rotating blades 302, the flow rate of the evaporated gas in the circular cavity 102 can be increased, and the evaporated solvent is prevented from re-condensing due to the slow rising speed, thereby improving the efficiency of the entire cycle.

[0050] like Figure 2 As shown, there are three heating plates 4, both ends of the heating plates 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. The heating plates 4 are quickly clamped to the outer wall of the conical cavity 101 through the clamping slots, thereby realizing the rapid installation and removal of the heating plates 4.

[0051] Specifically, three slots are provided on the outer wall surface of the solvent tank 1 at the upper end and the lower end of the outer wall of the conical cavity 101, and insertion openings of the same length are left between each slot.

[0052] When installing the heating plate 4, first align the heating plate 4 with the insertion port so that the card plate 401 on the heating plate 4 is inserted into the insertion port. By rotating the heating plate 4, the card plate 401 is inserted into the card slot. When the card plate 401 is completely rotated into the card slot, the installation of the single heating plate 4 is completed.

[0053] Furthermore, a handle 14 is installed on the heating plate 4, and the heating plate 4 can be moved and installed better by the handle 14. It is convenient for the staff to hold the heating plate 4. The heating plate 4 is externally connected to a heating power source, and the heating plate 4 is specifically a heating resistance wire. After passing through the heating resistance, the heat generated is conducted to the inner wall of the conical cavity 101, and then the mixed solution inside the conical cavity 101 is heated, so that the solvent quickly evaporates into water vapor and then flows back into the extraction tube 2.

[0054] like Figure 1 As shown, three support rods 10 extend outward from the upper end surface of the conical cavity 101 on the outer wall of the solvent tank 1, and the entire solvent tank 1 is supported by the support rods 10. The design of the support rods 10 in a circular array 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 causing 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 conducive to the dissipation of heat, and can more effectively help the solvent tank 1 maintain a suitable working temperature to prevent solvent deterioration or safety hazards caused by excessive temperature.

[0055] Furthermore, a closing plate 504 is disposed at the upper end of the driver 502 , and a flow guiding arc surface 505 is disposed on the closing plate 504 .

[0056] The sealing plate 504 can prevent the solvent flowing into the suction housing 501 from flowing into the driver 502 and damaging the driver 502 .

[0057] By setting the guide arc surface 505, the solution flowing into the extraction component 5 can be quickly gathered at the pipe mouth of the delivery pipe 6. After the solution in the conical cavity 101 enters the extraction component 5 through the discharge port 902, due to the inclined setting of the guide arc surface 505, the solution above quickly flows downward under the action of gravity and gathers at the bottom position of the guide arc surface 505. The delivery pipe 6 is connected to the bottom position of the guide arc surface 505, so the solution can be quickly collected and transported to the purification tank 7 through the delivery pipe 6 for the next step of purification.

[0058] Furthermore, a pressure pump 15 is provided on the delivery pipe 6 connected to the extraction component 5 , and the pressure pump 15 can quickly pump the solvent in the extraction housing 501 into the purification tank 7 .

[0059] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached 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).

2. The device for extracting and purifying natural caffeine in tea leaves according to claim 1, characterized in that: 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).

3. The device for extracting and purifying natural caffeine in tea leaves according to claim 1, characterized in that: The pumping assembly (5) comprises a pumping shell (501), the upper end opening of the pumping shell (501) being in communication with the conical cavity (101), and an opening and closing mechanism (9) being rotatably arranged at the opening, and a driver (502) being arranged at the lower end of the pumping shell (501), the driver (502) being connected to a driving rod (503), and the upper end of the driving rod (503) being connected to the opening and closing mechanism (9).

4. The device for extracting and purifying natural caffeine in tea leaves according to claim 3, characterized in that: 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); When the inner baffle (903) is driven to rotate by the driving rod (503), there are two rotation directions. In the rotation states in the two directions, the feed opening (902) is respectively in an open state and a closed state.

5. The device for extracting and purifying natural caffeine in tea leaves according to claim 4, characterized in that: 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).

6. The device for extracting and purifying natural caffeine in tea leaves according to claim 5, 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.

7. 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).

8. 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).

9. 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).

10. The device for extracting and purifying natural caffeine in tea leaves according to claim 3, 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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