A tea polyphenols continuous extraction device

Abstract

The present invention belongs to the field of tea polyphenol preparation, and specifically discloses a tea polyphenol continuous extraction device, including a frame, a tea leaf crushing device, a tea polyphenol extraction device, a tea polyphenol purification device and a control system, wherein an extraction tank is arranged on the frame, the upper chamber of the extraction tank is a crushing chamber, and the lower chamber is a stirring chamber; the tea leaf crushing device is arranged in the crushing chamber, and the tea polyphenol extraction device is arranged in the stirring chamber; a valve opening and closing device is also arranged between the crushing chamber and the stirring chamber; the tea polyphenol purification device includes a bracket, a purification tank, a filtering component arranged in the purification tank, and a pressurizing mechanism for pressurizing the crude solution in the purification tank; a solution conveying device is arranged between the liquid inlet of the purification tank and the liquid outlet in the stirring chamber of the extraction tank. The tea polyphenol continuous extraction device of the present invention can realize the continuous extraction of tea polyphenols in tea leaves, thereby improving the extraction efficiency of tea polyphenols and reducing the extraction cost of tea polyphenols.

Description

Technical Field

[0001] The invention belongs to the field of tea polyphenol preparation, and more specifically, relates to a tea polyphenol continuous extraction device. Background Art

[0002] Tea polyphenols is a general term for polyphenolic compounds such as flavanols, flavonoids, flavonols, phenolic acids and anthocyanins in tea. Flavanols (catechins) are the main components. They are a class of bioactive substances with broad application prospects in the fields of food, health food, and medicine. Tea polyphenols have many phenolic hydroxyl groups and are easily soluble in warm water, methanol, ethanol, propanol and ethyl acetate; they are insoluble in organic solvents such as chloroform and benzene. Tea polyphenols have the health and therapeutic effects of anti-cancer, prevention and treatment of cardiovascular diseases, improvement of comprehensive immunity, radiation protection, anti-oxidation, and digestion. The national standard principle of tea polyphenol purification method is to use the difference in solubility of tea polyphenols in different solvents.

[0003] At present, the extraction process of tea polyphenols includes the step of adding the extracting solution to the screened tea leaves and stirring them. After the tea leaves are fully stirred, they will be filtered and the tea polyphenols will be extracted from the filtrate. Among them, the uniformity of the stirring of the tea leaves is directly linked to the effect of the tea polyphenols extraction. Before the extraction and stirring of the tea polyphenols, the tea leaves need to be crushed so that the tea leaves can fully react with the extracting solution, thereby making the extraction effect better. After the extraction, the dissolved solution needs to be filtered multiple times to remove the tea residue particles in the dissolved solution.

[0004] Therefore, it is necessary to design a tea polyphenol extraction device that can continuously crush tea leaves and filter and purify the dissolved liquid after the reaction multiple times. Summary of the invention

[0005] In order to solve the deficiencies and shortcomings of the prior art, the purpose of the present invention is to provide a continuous extraction device for tea polyphenols, which can realize continuous extraction of tea polyphenols in tea leaves, thereby improving the extraction efficiency of tea polyphenols and reducing the extraction cost of tea polyphenols.

[0006] The technical solution of the present invention to solve the above technical problems is:

[0007] A tea polyphenol continuous extraction device comprises a frame, a tea crushing device arranged on the frame for crushing tea leaves, a tea polyphenol extraction device for extracting tea polyphenols from the crushed tea leaves, a tea polyphenol purification device for purifying a crude solution containing tea polyphenols extracted from the tea polyphenol extraction device, and a control system, wherein:

[0008] The frame is provided with an extraction tank, the upper chamber of the extraction tank is a crushing chamber, and the lower chamber is a stirring chamber; the tea crushing device is arranged in the crushing chamber, and the tea polyphenol extraction device is arranged in the stirring chamber; a valve opening and closing device for connecting or disconnecting the crushing chamber and the stirring chamber is also arranged between the crushing chamber and the stirring chamber;

[0009] The tea polyphenols purification device includes a bracket, a purification tank arranged on the bracket, a filtering component arranged in the purification tank, and a pressurizing mechanism for pressurizing the crude dissolved liquid in the purification tank to force the crude dissolved liquid in the purification tank to pass through the filtering component; a solution conveying device for conveying the crude dissolved liquid is arranged between the liquid inlet of the purification tank and the liquid outlet in the stirring chamber of the extraction tank.

[0010] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0011] 1. The tea polyphenol continuous extraction equipment of the present invention can realize the crushing of tea leaves, the extraction of tea polyphenols in the crushed tea leaves, and the further purification of the crude solution containing tea polyphenols obtained by extraction, thereby improving the extraction efficiency of tea polyphenols, reducing the extraction cost of tea polyphenols, and ensuring the quality of the extracted tea polyphenols.

[0012] 2. A valve opening and closing device is provided between the tea leaf crushing device and the tea polyphenols extraction device in the tea polyphenols continuous extraction equipment of the present invention, through which the crushing chamber and the stirring chamber can be connected and disconnected, so that the crushing of the tea leaves and the rough extraction of the tea polyphenols do not interfere with each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 and Figure 2 The three-dimensional structural schematic diagrams of the tea polyphenol continuous extraction device of the present invention are shown in two different viewing angles.

[0014] Figure 3 It is a front view of the tea polyphenols continuous extraction equipment of the present invention.

[0015] Figure 4 It is a cross-sectional view of a tea leaf crushing device and a tea polyphenols extraction device.

[0016] Figure 5 It is a structural schematic diagram of the valve opening and closing device.

[0017] Figure 6 It is a partial schematic diagram of the valve opening and closing device.

[0018] Figure 7 It is a schematic structural diagram of the first unloading device.

[0019] Figure 8It is a partial schematic diagram of the first unloading device.

[0020] Fig. 9 It is a three-dimensional diagram of the valve opening and closing device (the first partition is hidden).

[0021] Fig.10 This is a schematic diagram of the three-dimensional structure of the tea polyphenols purification device from the first perspective.

[0022] Fig.11 This is a schematic diagram of the three-dimensional structure of the tea polyphenols purification device from the second perspective.

[0023] Fig.12 This is a schematic diagram of the three-dimensional structure of the tea polyphenols purification device from the third perspective.

[0024] Fig.13 This is the front view of the tea polyphenols purification device.

[0025] Fig.14 This is a cross-sectional view of a tea polyphenols purification device.

[0026] Fig.15 It is a schematic diagram of the structure of the pressurizing piston.

[0027] Fig.16 It is a schematic structural diagram of the second unloading device.

[0028] Fig.17 It is a schematic diagram of the structure of the locking structure and the second unloading drive mechanism.

[0029] Fig.18 It is a three-dimensional diagram of the locking structure.

[0030] Fig.19 It is a three-dimensional diagram of the locking block.

[0031] Fig. 20 This is a three-dimensional diagram of the screw shaft.

[0032] Fig.21 This is a simplified structural diagram of the motion switching mechanism in Example 2.

[0033] Fig. 22 This is a schematic diagram of the structure of the locking structure used to lock the first unloading platform in Example 4.

[0034] In the figure: 1-frame; 2-extraction tank; 3-feeding port; 4-first belt transmission mechanism; 5-second belt transmission mechanism; 6-driving motor; 7-tea residue collecting device; 8-solution conveying device; 9-tea polyphenols purification device; 901-bracket; 902-transmission shaft; 9021-bidirectional spiral section; 903-driving gear; 904-rotating sleeve; 905-driven gear; 906-guide shaft; 907-adjusting seat; 908-lifting seat; 909-bidirectional screw rod; 910-outer sleeve; 911-purification tank; 9 12-guide shaft; 913-sliding rod; 914-third power drive assembly; 915-circular pipe rack; 9151-inner sleeve; 916-filter assembly; 917-drive shaft; 918-drive block; 919-drive wheel; 920-locking spring; 921-locking block; 922-second unloading platform; 923-limiting boss; 924-horizontal matching part; 925-inclined part; 926-horizontal locking part; 927-pressurizing piston; 928-circular scraper ring; 10-tea crushing device; 101-crushing rotor shaft; 102-crushing knife; 11-valve opening and closing device; 111-first partition; 112-second partition; 113-torsion spring; 114-clamping assembly; 115-limiting block; 116-limiting groove; 117 first power drive assembly; 12-reducer; 13-tea polyphenols extraction device; 131-stirring shaft; 132-stirring blade; 133-filter cartridge; 134-first shaft sleeve; 135-guide part; 14-first unloading device; 141-mounting frame; 142-guide rod; 143-reset spring Spring; 144-first unloading platform; 145-second power drive assembly; 146-screw shaft; 1461-spiral groove; 1462-annular groove; 147-first push rod; 148-second shaft sleeve; 15-support frame; 16-liquid outlet pipe; 17-compression spring; 18-motion switching mechanism; 181-transmission box; 182-electric push rod; 183-motor seat; 184-main gear; 185-first gear shaft; 186-second gear shaft; 19-annular groove; 20-wedge block; 21-linear drive. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0036] Example 1

[0037] See also Figure 1-Figure 20 The tea polyphenol continuous extraction device of the present invention comprises a frame 1, a tea crushing device 10 arranged on the frame 1 for crushing tea leaves, a tea polyphenol extraction device 13 for extracting tea polyphenols from the crushed tea leaves, a tea polyphenol purification device 9 for purifying the crude solution containing tea polyphenols extracted from the tea polyphenol extraction device 13, and a control system, wherein:

[0038] The frame 1 is provided with an extraction tank 2, the upper chamber of the extraction tank 2 is a crushing chamber, and the lower chamber is a stirring chamber, wherein the tea crushing device 10 is arranged in the crushing chamber, and the tea polyphenol extraction device 13 is arranged in the stirring chamber; a valve opening and closing device 11 for connecting or disconnecting the crushing chamber and the stirring chamber is also arranged between the crushing chamber and the stirring chamber;

[0039] The tea polyphenols purification device 9 includes a bracket 901, a purification tank 911 arranged on the bracket 901, a filtering component 916 arranged in the purification tank 911, and a pressurizing mechanism for pressurizing the crude dissolved liquid in the purification tank 911 to force the crude dissolved liquid in the purification tank 911 to pass through the filtering component 916; a solution conveying device 8 for conveying the crude dissolved liquid is arranged between the liquid inlet of the purification tank 911 and the liquid outlet in the stirring chamber of the extraction tank 2.

[0040] See also Figure 1-Figure 20 The extraction tank 2 is provided with a feed port 3 at the upper end of the crushing chamber; the tea crushing device 10 includes a crushing component and a crushing drive mechanism for driving the crushing component to rotate, wherein the crushing component includes a crushing shaft 101 and a crushing knife 102 arranged on the crushing shaft 101; the crushing shaft 101 is coaxially arranged with the crushing chamber; the crushing drive mechanism includes a drive motor 6; the drive motor 6 is installed on the frame 1, and the main shaft of the drive motor 6 is connected to the crushing shaft 101 through a first belt transmission mechanism 4.

[0041] In this embodiment, a feed gate is provided at the feed port 3; when the tea leaves need to be crushed, the feed gate is opened, and then the tea leaves are fed into the feed port 3; the drive motor 6 is started, thereby driving the crushing shaft 101 and the crushing knife 102 arranged in the crushing shaft 101 to rotate at high speed, thereby crushing the tea leaves in the crushing chamber.

[0042] See also Figure 1-Figure 20 The valve opening and closing device 11 includes a first partition 111, a second partition 112 and a rotary opening mechanism for driving the second partition 112 to rotate, wherein:

[0043] The first partition 111 is installed in the inner cavity of the extraction tank 2, and a plurality of groups of blanking openings are arranged on the first partition 111, and the plurality of groups of blanking openings are arranged at equal angles along the circumferential direction of the first partition 111; the second partition 112 is arranged on the upper side of the first partition 111, and the second partition 112 includes a rotating part and a plurality of groups of blocking blocks arranged on the rotating part, wherein the plurality of groups of blocking blocks are arranged at equal angles along the circumferential direction of the rotating part; the rotating part is coaxially arranged with the first partition 111, and is rotatably connected to the first partition 111; a torsion spring 113 is arranged between the rotating part and the first partition 111, and the elastic force of the torsion spring 113 causes the second partition 112 to block the blanking opening of the first partition 111;

[0044] The rotary opening mechanism includes a clamping assembly 114 arranged on the rotating part of the second partition 112 and a first power drive assembly 117 for driving the clamping assembly 114 to clamp or release the crushing shaft 101, wherein the clamping assembly 114 includes a first clamping block and a second clamping block arranged on the rotating part of the second partition 112, and friction plates are arranged on the inner sides of the first clamping block and the second clamping block; a locking structure for limiting the rotation angle of the second partition 112 is also arranged between the first partition 111 and the second partition 112; the locking structure includes a limit block 115 arranged on the first partition 111 and a limiting groove 116 arranged on the blocking block of the second partition plate 112 and cooperating with the limiting block 115; when the second partition plate 112 is driven by the crushing shaft 101 to rotate until the limiting groove 116 on the blocking block is matched with the limiting block 115 on the first partition plate 111, the second partition plate 112 stops rotating, and the blanking port is in an open state at this time; when the second partition plate 112 rotates in the opposite direction under the elastic force of the torsion spring 113 until the blocking block contacts with a limiting block 115 at another location on the first partition plate 111, the second partition plate 112 stops rotating, and the blanking port is blocked by the blocking block, that is, it is in a closed state;

[0045] When it is necessary to connect the crushing chamber and the stirring chamber, the control system controls the first power drive component 117 to drive the first clamping block and the second clamping block to clamp the crushing shaft 101, thereby driving the second partition plate 112 to overcome the elastic force of the torsion spring 113 and rotate; when the second partition plate 112 rotates to be completely offset from the blanking port of the first partition plate 111, the locking structure restricts the second partition plate 112 from continuing to rotate. At this time, since a friction block is provided between the clamping component 114 and the crushing shaft 101, that is, there is friction transmission between the clamping component 114 and the crushing shaft 101, when the friction force between the crushing shaft 101 and the friction block is less than the resistance encountered by the friction block; the crushing shaft 101 and The clamping assembly 114 rotates relatively, so that the crushing shaft 101 can continue to rotate, while the second partition 112 does not continue to rotate, so that the drop opening can be kept in an open state; when the tea leaves in the crushing chamber completely fall into the stirring chamber, the drop opening needs to be closed. At this time, the control system controls the first power drive assembly 117 to drive the first clamping block and the second clamping block to release the crushing shaft 101, so that the second partition 112 rotates in the opposite direction under the elastic force of the torsion spring 113; when the second partition 112 rotates to completely overlap with the drop opening on the first partition 111, the locking structure restricts the second partition 112 from continuing to rotate in the opposite direction; at this time, the crushing chamber and the stirring chamber are disconnected again;

[0046] By adopting the above-mentioned valve opening and closing device 11, the opening or closing of the material drop port can be assisted by the rotational force of the crushing shaft 101, and due to the use of friction transmission, the material drop port can be restricted by the locking structure when it is opened, so that the second partition 112 will not rotate 360 ​​degrees with the crushing shaft 101, that is, the material drop port can be in an open state for a long time, and the crushing shaft 101 and the stirring shaft 131 can still rotate 360 ​​degrees, so that when the second partition 112 is limited by the locking structure, it will not interfere with the rotation of the crushing shaft 101 and the stirring shaft 131.

[0047] In this embodiment, the second partition 112 is arranged above the first partition 111, and the two sides of the upper end of the shielding block of the second partition 112 are provided with downwardly inclined guide parts (not shown in the drawings of the specification), so that the crushed tea leaves are guided by the guide parts to the first partitions 111 on both sides, and when the drop port is opened, as the second partition 112 rotates, the guide parts can push the tea leaves to the drop port; when the curvature of the shielding block is greater than or equal to the curvature between two adjacent drop ports in the first partition 111, that is, the guide parts on both sides can extend to the drop ports on both sides respectively, the tea leaves falling from the top will be guided by the guide parts into the drop port, thereby ensuring that the tea leaves in the crushing chamber smoothly enter the filter cylinder 133 of the stirring chamber.

[0048] See also Figure 1-Figure 20 The tea polyphenols extraction device 13 includes a filter cartridge 133 disposed in the stirring chamber and a stirring mechanism disposed in the filter cartridge 133, wherein:

[0049] A liquid inlet is provided in the stirring chamber, and the liquid inlet is connected to the extraction liquid conveying device;

[0050] The filter cartridge 133 is coaxially arranged with the stirring chamber, and a guide portion 135 for guiding the crushed tea leaves into the inner cavity of the filter cartridge 133 is arranged at the upper end of the filter cartridge 133, and a plurality of filter meshes are arranged on the outer side;

[0051] The stirring mechanism includes a stirring component arranged in the filter barrel 133 and a stirring driving mechanism for driving the stirring component to rotate, wherein the stirring component includes a stirring shaft 131 and a stirring blade 132 arranged on the stirring shaft 131; the stirring shaft 131 is coaxially arranged with the filter barrel 133, and the upper end of the stirring shaft 131 is connected to the lower end of the crushing shaft 101 through a reducer 12; the reducer 12 is installed at the lower end of the first partition 111, the input shaft of the reducer 12 is connected to the crushing shaft 101, and the output shaft is connected to the stirring shaft 131.

[0052] Through the above arrangement, the tea leaves passing through the drop port are guided into the filter barrel 133 by the guide part 135, and then the extracting liquid conveying device conveys the extracting liquid into the stirring chamber; the reducer 12 is used to transfer the power of the crushing shaft 101 to the stirring shaft 131 after deceleration, because crushing requires a higher rotation speed, so the crushing shaft 101 needs to rotate at a high speed, while stirring does not require a higher rotation speed, so the stirring shaft 131 is rotated at a low speed through the reducer 12. As the stirring assembly rotates continuously, the tea leaves in the filter barrel 133 fully react with the extracting liquid, and when the reaction time is reached, the crude solution in the stirring chamber is conveyed to the tea polyphenol purification device 9 through the solution conveying device 8, and the next purification process is carried out to completely remove the tea residue in the crude solution.

[0053] In addition, in order to improve the precipitation efficiency of tea polyphenols, an ultrasonic generator can be arranged in the stirring chamber to generate ultrasonic vibrations, thereby accelerating the reaction of tea polyphenols in the tea leaves with the extract, and further accelerating the precipitation of tea polyphenols.

[0054] In addition, a temperature control device is provided in the stirring chamber and the "purification tank 911" mentioned below. The temperature control device is connected to the control system and is used to regulate the temperature in the stirring chamber and the "purification tank 911" mentioned below, so as to control the temperature in the stirring chamber within the appropriate temperature range required for tea polyphenols extraction or purification.

[0055] See also Figure 1-Figure 20 The lower end of the stirring chamber is provided with a first discharge port, which is located inside the filter cylinder 133. The first discharge port is provided with a first discharge device 14 for discharging tea residues in the filter cylinder 133; the first discharge device 14 includes a first discharge platform 144 and a first discharge drive mechanism for driving the first discharge platform 144 to rise and fall, wherein:

[0056] The first unloading platform 144 is coaxially arranged with the filter cylinder 133, and the upper end of the first unloading platform 144 is conical (so that the tea residue can flow downward to the tea residue collecting device 7 below under the drive of part of the coarse dissolving liquid), and cooperates with the first unloading port; a plurality of groups of guide rods 142 are arranged at the lower end of the first unloading platform 144, and a mounting frame 141 is arranged at the bottom of the extraction tank 2, and a guide hole cooperating with the guide rod 142 is arranged on the mounting frame 141, and a reset spring 143 is arranged between the guide rod 142 and the mounting frame 141, and the reset spring 143 is sleeved on the guide rod 142, and the elastic force of the reset spring 143 causes the first unloading platform 144 to block upward at the first unloading port;

[0057] The first unloading driving mechanism includes a screw shaft 146 disposed at the bottom of the stirring shaft 131, a first push rod 147 disposed at the bottom of the first unloading platform 144, and a second power driving assembly 145 for driving the first push rod 147 to extend into the spiral groove 1461 in the screw shaft 146, wherein:

[0058] A first sleeve portion 134 is provided at the bottom of the stirring shaft 131 at a corresponding position of the screw shaft 146; a second sleeve portion 148 is provided at the center of the first discharge platform 144, and the second sleeve portion 148 is located on the inner side of the first sleeve portion 134, and the outer circumferential surface of the second sleeve portion 148 is in contact with the inner circumferential surface of the first sleeve portion 134, so as to achieve a guiding effect and a sealing effect, that is, to prevent the coarse solution from flowing out of the "avoidance hole" mentioned below during the period when the tea residue is not discharged; at the same time, a corresponding waterproof structure, such as a sealing ring, can be provided between the first sleeve portion 134 and the second sleeve portion 148; the lower end of the screw shaft 146 passes through the axis of the first discharge platform 144, and an avoidance hole for avoiding the screw shaft 146 is provided at the center of the first discharge platform 144, so that the screw shaft 146 does not contact the first discharge platform 144 under normal conditions;

[0059] The outer surface of the screw shaft 146 is provided with a spiral groove 1461 and an annular groove 1462 connected to the bottom of the spiral groove 1461, wherein the spiral groove 1461 is located at the upper end of the screw shaft 146, and the annular groove 1462 is located at the lower end of the screw shaft 146;

[0060] A fixed seat is provided at the bottom of the first unloading platform 144, and the second power drive assembly 145 is installed on the fixed seat; the first push rod 147 is slidably connected to the fixed seat, and the axial direction of the first push rod 147 is perpendicular to the axial direction of the screw shaft 146;

[0061] When the solution conveying device 8 pumps the coarse dissolved liquid in the stirring chamber to below the liquid level, the tea residue below needs to be discharged. At this time, the control system controls the second power drive component 145 to drive the first push rod 147 to extend into the spiral groove 1461 of the screw shaft 146; as the stirring shaft 131 rotates, the screw shaft 146 also rotates synchronously, so that the first push rod 147 moves downward under the guidance of the spiral groove 1461, thereby driving the first unloading platform 144 to move downward; when the first push rod 147 moves downward into the annular groove 1462, even if the screw shaft 146 continues to rotate, the first unloading platform 144 is still in a stationary state; at the same time, it is limited by the annular groove 1462, so the first unloading platform 144 will remain in this position, so that the first unloading port is in The first unloading platform 144 is in an open state until the tea residue in the filter cartridge 133 is completely discharged; wherein, the discharge of the tea residue at the bottom of the filter cartridge 133 can be accelerated by spraying a high-pressure water column by arranging a nozzle on the side wall of the stirring chamber or the mounting frame 141: when the tea residue at the bottom of the filter cartridge 133 is completely discharged, the control system controls the second power drive assembly 145 to drive the first push rod 147 to withdraw to the outside of the annular groove 1462 of the screw shaft 146, and under the elastic force of the reset spring 143, the first unloading platform 144 moves upward and is re-sealed at the first unloading port; subsequently, the valve opening and closing device 11 is actuated to open the drop port, so that the tea leaves in the crushing chamber fall into the filter cartridge 133 of the stirring chamber again, and then the extracting liquid conveying device conveys the extracting liquid into the stirring chamber to carry out a new round of tea polyphenols crude extraction process.

[0062] See also Figure 1-Figure 20 The pressurizing mechanism includes a lifting seat 908, a pressurizing piston 927 disposed on the lifting seat 908, and a pressurizing driving mechanism for driving the pressurizing piston 927 to perform vertical reciprocating motion, wherein the pressurizing piston 927 is disposed on the outside of the filter assembly 916 and is coaxially disposed with the filter assembly 916, and the pressurizing piston 927 is mounted on the lifting seat 908 through a sliding rod 913; the lower end of the sliding rod 913 is mounted on the pressurizing piston 927, and the upper end is The filter assembly 916 is installed on the lifting seat 908; the bracket 901 is provided with a sliding hole that cooperates with the sliding rod 913; the bottom of the pressurizing piston 927 is provided with a circular scraper ring 928, and the circular scraper ring 928 is installed at the middle part of the pressurizing piston 927. The circular scraper ring 928 is coaxially arranged with the pressurizing piston 927 and is located on the outside of the filter assembly 916; the bottom of the circular scraper ring 928 is provided with a scraper portion that contacts the outer circumferential surface of the filter assembly 916;

[0063] Through the above arrangement, when the pressurizing piston 927 reciprocates vertically, the circular scraper ring 928 can scrape off the tea residue adsorbed on the outer surface of the filter component 916, thereby avoiding clogging of the filter holes of the filter component 916, which is beneficial to improving the filtering efficiency.

[0064] See also Figure 1-Figure 20 The pressurizing driving mechanism includes a bidirectional screw rod 909 installed on the bracket 901 and a power driving mechanism for driving the bidirectional screw rod 909 to rotate, wherein the upper end of the bidirectional screw rod 909 is connected to the main shaft of the driving motor 6 or the crushing shaft 101 through the second belt transmission mechanism 5, and the lower end extends vertically downward; a screw nut cooperating with the bidirectional screw rod 909 is provided on the lifting seat 908; the screw nut is installed on the lifting seat 908; the bidirectional screw rod 909 is driven to rotate by the power driving mechanism, thereby driving the lifting seat 908 to perform lifting and reciprocating motion, thereby realizing repeated pressurization of the crude solution in the purification tank 911, so as to accelerate the rate at which the crude solution passes through the filtering component 916, thereby improving the purification efficiency.

[0065] See also Figure 1-Figure 20 The pressurizing drive mechanism also includes a stroke adjustment mechanism for adjusting the descending height of the pressurizing piston 927, and the stroke adjustment mechanism includes an adjustment seat 907 arranged above the lifting seat 908 and an adjustment drive mechanism for driving the adjustment seat 907 to rise and fall, wherein:

[0066] The adjustment seat 907 is connected to the bracket 901 through a guide shaft 912, and the bracket 901 is provided with a guide hole that matches the guide shaft 912; the adjustment seat 907 is rotatably connected with a rotating sleeve 904, the lower end of the rotating sleeve 904 is connected to the bidirectional screw rod 909, and the upper end is installed with a driven gear 905; the bracket 901 is provided with a guide shaft 906 at the upper end of the rotating sleeve 904, the upper end of the guide shaft 906 is fixed to the bracket 901, and the lower end extends vertically into the rotating sleeve 904, the purpose of which is to guide and limit the lifting movement of the rotating sleeve 904;

[0067] The adjustment drive mechanism includes a transmission shaft 902 and a driving gear 903 arranged on the transmission shaft 902, wherein the upper end of the transmission shaft 902 is rotatably connected to the bracket 901, and is connected to the main shaft or crushing shaft 101 of the driving motor 6 through the second belt transmission mechanism 5; the lower end of the transmission shaft 902 extends vertically downward, and the lower end of the transmission shaft 902 is provided with a bidirectional spiral section 9021; the adjustment seat 907 is provided with a second push rod and a third power drive assembly 914 (which can refer to the first push rod 147 and the second power drive assembly 145) for driving the second push rod to enter the bidirectional spiral section 9021, wherein the axial direction of the second push rod is perpendicular to the axial direction of the transmission shaft 902;

[0068] The bracket 901 is provided with a height detection sensor for detecting the height position of the adjustment seat 907;

[0069] Through the above arrangement, when it is necessary to increase the descending height of the pressurizing piston 927, since the bidirectional screw rod 909 is used in this embodiment to drive the lifting seat 908 to perform a lifting and reciprocating motion, when it is necessary to change the descending height of the pressurizing piston 927, the control system controls the third power drive assembly 914 to drive the second push rod to enter the bidirectional spiral section 9021 of the transmission shaft 902; as the transmission shaft 902 continues to rotate, under the guidance of the bidirectional spiral section 9021, the second push rod will move downward, thereby driving the adjusting seat 907 to move downward, thereby driving the lifting seat 908 and the pressurizing piston 927 arranged on the lifting seat 908. The piston 927 moves downward as a whole. When the height detection sensor detects that the lifting seat 908 has reached a predetermined height, the control system controls the third power drive assembly 914 to drive the second push rod to withdraw from the bidirectional spiral section 9021. At this time, although the transmission shaft 902 continues to rotate, it cannot drive the adjustment seat 907 to continue to rise and fall. Since the lifting stroke of the lifting seat 908 is constant, the adjustment method in this embodiment is equivalent to changing the overall height of the entire lifting seat 908 and the pressurizing piston 927 on the lifting seat 908, thereby changing the height position of the lowest point of the lifting stroke of the pressurizing piston 927.

[0070] In the above process, since the upper end of the rotating sleeve 904 is sleeved on the guide shaft 906, when the rotating sleeve 904 is raised and lowered along with the adjusting seat 907, it can be ensured that the driven gear 905 on the rotating sleeve 904 and the driving gear 903 on the transmission shaft 902 are always kept in meshing state;

[0071] In this embodiment, the second belt transmission mechanism 5, the transmission shaft 902, the driving gear 903, the driven gear 905 and the rotating sleeve 904 constitute the power driving mechanism, which is used to drive the bidirectional screw rod 909 to rotate.

[0072] See also Figure 1-Figure 20 The bottom of the purification tank 911 is provided with a second discharge port, and a second discharge device is provided at the second discharge port; the second discharge device includes a support frame 15 provided at the bottom of the purification tank 911, a second discharge platform 922 provided on the support frame 15, and a second discharge drive mechanism for driving the second discharge platform 922 to rise and fall, wherein,

[0073] The purification tank 911 is provided with a circular tube rack 915 coaxially arranged therewith, the upper end of the circular tube rack 915 is slidably connected to the pressurizing piston 927 (i.e., the inner sleeve 9151 and the outer sleeve 910 are matched), and the lower end is connected to the liquid outlet pipe 16; the circular tube rack 915 is provided with a plurality of openings in the middle area of ​​the purification tank 911; the filter assembly 916 is sleeved in the middle area of ​​the circular tube rack 915; in this embodiment, the filter assembly 916 adopts a reverse osmosis membrane or an ultrafiltration membrane;

[0074] The center hole of the second unloading platform 922 is sleeved on the liquid outlet pipe 16, and a compression spring 17 is arranged between the second unloading platform 922 and the support frame 15. The compression spring 17 is sleeved on the liquid outlet pipe 16, and the lower end of the compression spring 17 acts on the support frame 15, and the upper end acts on the second unloading platform 922; the elastic force of the compression spring 17 causes the second unloading platform 922 to be sealed upward at the second unloading port.

[0075] See also Figure 1-Figure 20 A locking structure is provided between the second unloading platform 922 and the support frame 15; the locking structure includes a locking block 921 provided on the support frame 15; the second unloading platform 922 is provided with a horizontal matching portion 924 at a position corresponding to the locking block 921; the locking block 921 is slidably connected to the support frame 15 through a connecting shaft; a locking spring 920 is provided between the support frame 15 and the locking block 921, and the locking spring 920 is sleeved on the connecting shaft, and the elastic force of the locking spring 920 prompts the locking block 921 to abut against the lower end of the horizontal matching portion 924 of the second unloading platform 922.

[0076] By setting the above-mentioned locking structure, the lifting movement of the second unloading platform 922 can be locked, thereby preventing the second unloading platform 922 from overcoming the elastic force of the compression spring 17 and moving downward to open the second unloading port due to excessive internal pressure of the purification tank 911 (for example, the gravity of the crude solution and the pressure of the pressurizing piston 927); when the second unloading port needs to be opened, the locking of the second unloading platform 922 by the locking structure can only be released first, specifically: first, the locking block 921 needs to be urged to move radially outward so that the top of the locking block 921 is separated from the horizontal matching portion 924 of the second unloading platform 922; in this way, the lock on the second unloading platform 922 is released, so that the second unloading platform 922 can move downward under sufficient pressure to open the second unloading port.

[0077] The locking structures can be several groups, such as two groups, three groups, four groups, etc. In the present embodiment, the locking structures are two groups, and the two groups of locking structures are symmetrically arranged at 180 degrees.

[0078] See also Figure 1-Figure 20 , the second unloading drive mechanism is a plurality of groups, and the plurality of groups of the second unloading drive mechanism are arranged in a circle; each group of the second unloading drive mechanism corresponds to the locking structure one by one; in this embodiment, the second unloading drive mechanism is also two groups;

[0079] The second unloading drive mechanism includes a driving shaft 917, a driving block 918 arranged on the driving shaft 917, and a driving wheel 919 arranged at the lower end of the driving block 918, wherein the upper end of the driving shaft 917 vertically passes through the bottom of the purification tank 911, and the purification tank 911 is provided with a sliding hole matched with the driving shaft 917 at a position corresponding to the driving shaft 917; the driving block 918 is located on the outer side of the purification tank 911 and above the horizontal matching portion 924 of the second unloading platform 922; the driving wheel 919 is vertically rotatably connected to the bottom of the driving shaft 917; the locking block 921 is provided with a horizontal locking portion 926 and an inclined portion 925, wherein when it is necessary to lock the bottom of the second unloading platform 922, the upper end of the horizontal locking portion 926 contacts the bottom of the horizontal matching portion 924; the driving wheel 919 is located above the inclined portion 925;

[0080] When unloading is required, the locking of the second unloading platform 922 by the horizontal locking portion 926 in the locking block 921 needs to be released first; specifically:

[0081] First, the adjustment drive mechanism drives the adjustment seat 907 to move to the lowest point; in the process of the pressurizing piston 927 moving downward, the bottom of the pressurizing piston 927 contacts the upper end of the driving shaft 917 and drives the driving shaft 917 to move downward, so that the driving wheel 919 at the bottom of the driving shaft 917 contacts and squeezes the inclined portion 925 in the locking block 921, thereby prompting the locking block 921 to overcome the elastic force of the locking spring 920 and move radially outward, thereby achieving separation from the horizontal matching portion 924 of the second unloading platform 922, thereby releasing the locking block 921 from the second unloading platform 922; as the pressurizing piston 927 drives the driving shaft 917 to continue to descend, the driving block 918 on the driving shaft 917 will contact the top of the horizontal matching portion 924 of the second unloading platform 922 and drive the second unloading platform 922 to move downward, overcoming the elastic force of the compression spring 17, thereby opening the second unloading port.

[0082] In the above process, the circular scraper ring 928 in the pressurizing piston 927 will also scrape off the tea residue on the surface of the filter assembly 916; at the same time, since the area of ​​the second discharge port is smaller than the bottom area of ​​the pressurizing piston 927, during the downward movement of the pressurizing piston 927, downward pressure will be generated on the tea residue and a small amount of crude dissolved liquid at the bottom of the purification tank 911, thereby accelerating the discharge of the tea residue and crude dissolved liquid in the purification tank 911 from the second discharge port. After the tea residue and a small amount of crude dissolved liquid in the purification tank 911 are discharged, the pressurizing piston 927 moves upward, so the pressure exerted on the driving shaft 917 is gradually reduced. At this time, the locking block 921 moves radially inward under the elastic force of the locking spring 920, and the inclined portion 925 on the locking block 921 will prompt the driving shaft 917 to move upward. At the same time, the second unloading platform 922 moves upward under the elastic force of the compression spring 17 and prompts the driving block 918 to move upward synchronously. When the second unloading platform 922 is blocked at the second unloading port again, , the driving block 918 is separated from the horizontal matching part 924 of the second unloading platform 922. At the same time, as the locking block 921 continues to move radially inward, the driving block 918 will continue to move upward until its upper end hits the support frame 15. At this time, the locking block 921 stops moving, and the horizontal locking part 926 of the locking block 921 is located at the bottom of the horizontal matching part 924 of the second unloading platform 922, thereby locking the second unloading platform 922; at the same time, the driving wheel 919 is located above the inclined part 925 of the locking block 921.

[0083] See also Figure 1-Figure 20A liquid level sensor is provided in the inner cavity of the purification tank 911 for detecting the liquid level of the crude solution in the purification tank 911 and sending the detected data information to the control system; a flow rate sensor may be provided in the liquid outlet pipe 16. When the flow rate sensor detects that the flow rate in the liquid outlet pipe 16 is less than a preset value / range, and the liquid level detected by the liquid level sensor is not within the height range of the dischargeable tea residue, the control system controls the stroke adjustment mechanism to reduce the lowest point of the lifting stroke of the pressurizing piston 927 (which can be increased according to a preset amplitude (for example, 10 cm each time)) to increase the pressurization pressure of the pressurizing piston 927 and improve the filtration efficiency; when it is detected that the flow rate in the liquid outlet pipe 16 is less than a preset value / range, and the liquid level sensor detects that the liquid level is within the height range of the discharge tea residue, the slag discharge operation is started, and the lowest point of the lifting stroke of the pressurizing piston 927 is adjusted to the lower limit value (that is, the adjustment seat 907 moves to the lowest point) by the stroke adjustment mechanism, so that the pressurizing piston 927 can drive the driving shaft 917 to descend, thereby opening the second discharge port for slag discharge.

[0084] See also Figure 1-Figure 20 A tea residue collecting device 7 is provided at the bottom of the first discharge port and the second discharge port. An extrusion device can be provided in the tea residue collecting device 7 for squeezing the collected tea residue, thereby squeezing out the coarse dissolved liquid inside, and filtering the squeezed out coarse dissolved liquid and then sending it to the purification tank 911 for further purification.

[0085] In this embodiment, in order to ensure the sealing performance, a sealing component, such as a sealing ring or a sealing sleeve, may be provided at the connection of each part.

[0086] See also Figure 1-Figure 20 The lower end of the liquid outlet pipe 16 is installed on the support frame 15, and the upper end is connected to the liquid outlet of the circular tube rack 915. A limiting boss 923 is provided at the upper end of the circular tube rack 915, and a sealing structure, such as a sealing ring, is provided between the limiting boss 923 and the surface of the second unloading platform 922.

[0087] See also Figure 1-Figure 20 The solution delivery device 8 uses a delivery pipeline and a delivery pump arranged in the delivery pipeline, and the crude solution is delivered to the purification tank 911 through the delivery pump.

[0088] See also Figure 1-Figure 20 The first power drive assembly 117, the second power drive assembly 145 and the third power drive assembly 914 are linear drives, such as electromagnets.

[0089] Example 2

[0090] See also Fig.21 The difference between this embodiment and embodiment 1 is that:

[0091] The main shaft of the driving motor 6 is provided with a motion switching mechanism 18, and the motion switching mechanism 18 includes a transmission box 181, a first gear shaft 185 and a second gear shaft 186 arranged in the transmission box 181, wherein the first gear shaft 185 and the second gear shaft 186 are arranged in parallel, and the lower ends are both rotatably connected in the transmission box 181, and the upper ends are both extended out of the transmission box 181, wherein the first gear shaft 185 is connected to the crushing shaft 101 through a first belt transmission mechanism 4; the second gear shaft 186 is connected to the transmission shaft 902 through a second belt transmission mechanism 5; the driving motor 6 is mounted on the electric On the machine base 183, the main shaft of the driving motor 6 is located between the first gear shaft 185 and the second gear shaft 186; a main gear 184 is arranged on the main shaft of the driving motor 6; the motor base 183 is driven to move vertically by arranging an electric push rod 182, when the motor base 183 moves to a first height position, the main gear 184 cooperates with the first gear shaft 185; when the motor base 183 moves to a second height position, the main gear 184 cooperates with the first gear shaft 185 and the second gear shaft 186 respectively; when the motor base 183 moves to a third height position, the main gear 184 cooperates with the second gear shaft 186;

[0092] Through the above arrangement, the power of the driving motor 6 can be transmitted to the first belt transmission mechanism 4, or the power of the driving motor 6 can be transmitted to the second belt transmission mechanism 5, or the power can be transmitted to the first belt transmission mechanism 4 and the second belt transmission mechanism 5 at the same time according to actual needs; thereby, the tea leaf crushing device 10 and the tea polyphenols extraction device 13, or the tea polyphenols purification device 9 can be selected to work alone, or the tea leaf crushing device 10, the tea polyphenols extraction device 13 and the tea polyphenols purification device 9 can be selected to work together according to actual conditions.

[0093] Example 3

[0094] The difference between this embodiment and embodiment 1 is that:

[0095] The crushing shaft 101 includes an inner shaft and an outer shaft arranged coaxially, wherein the crushing knife 102 is installed on the outer shaft, and the outer shaft is rotatably connected in the extraction tank 2; the upper end of the inner shaft is connected to the first belt transmission mechanism 4, and the lower end is connected to the output shaft of the reducer 12; the clamping assembly 114 installed on the second partition 112 realizes power transmission by clamping the inner shaft; and a clamping mechanism is also provided on the outer shaft, which can be implemented with reference to the clamping assembly 114; in this way, when the crushed tea leaves fall into the drop port, the clamping mechanism can be urged to loosen the inner shaft, so that the outer shaft and the crushing knife 102 arranged on the outer shaft stop rotating, thereby avoiding turbulence in the crushing chamber and causing the crushed tea leaves to float around in the crushing chamber, thereby ensuring that the crushed tea leaves can pass through the drop port smoothly.

[0096] Example 4

[0097] See also Fig. 22 The difference between this embodiment and embodiment 1 is that:

[0098] A locking structure is also provided at the bottom of the first unloading platform 144, and the locking structure includes a wedge block 20 arranged at the bottom of the extraction tank 2 and a linear drive 21 for driving the wedge block 20 to move, wherein the lower end of the wedge block 20 is provided with an inclined surface, and the upper end is a horizontal surface; when the first unloading platform 144 is upwardly blocked at the first unloading port, the linear drive 21 drives the wedge block 20 to extend so that the horizontal surface of its upper end contacts the bottom of the first unloading platform 144, thereby locking the first unloading platform 144 to prevent the first unloading platform 144 from descending and opening the first unloading port because the downward pressure in the stirring chamber is greater than the elastic force of the reset spring 143; when the tea residue needs to be discharged, the linear drive 21 drives the wedge block 20 to retract, thereby releasing the lock on the first unloading platform 144.

[0099] In addition, the bottom of the first unloading platform 144 is provided with an annular groove 19 coaxially arranged therewith, and the cross section of the annular groove 19 is T-shaped; the upper end of the guide rod 142 is installed in the annular groove 19, and the two can be provided with friction plates for increasing friction, so that when the screw shaft 146 drives the first push rod 147 and the first unloading platform 144 to descend, the first unloading platform 144 is not easy to rotate due to the excessive friction between it and the guide rod 142, thereby ensuring that it can move downward; the upper end of the guide rod 142 is installed in the annular groove 19, and the friction plates can be provided on both sides to increase the friction force, so that when the screw shaft 146 drives the first push rod 147 and the first unloading platform 144 to descend, the first unloading platform 144 is not easy to rotate due to the excessive friction between it and the guide rod 142, thereby ensuring that it can move downward; The cross-section of the end is also T-shaped; a convex tooth is arranged in the annular groove 1462, and when the first push rod 147 enters the annular groove 1462 and cooperates with the convex tooth, the rotation of the screw shaft 146 will drive the first unloading platform 144 to overcome the friction resistance of the friction plate and rotate, and a plurality of groups of unloading plates arranged in a circular shape can be arranged on the first unloading platform 144; as the first unloading platform 144 rotates, under the action of centrifugal force, the first unloading platform 144 can throw the tea residue on its upper surface into the tea residue collection device 7.

[0100] The embodiments of the present invention are not limited to the above contents, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention shall be equivalent replacement methods and shall be included in the protection scope of the present invention.

Claims

1. A tea polyphenols continuous extraction device, characterized in that: The invention comprises a frame, a tea crushing device arranged on the frame for crushing tea leaves, a tea polyphenol extraction device for extracting tea polyphenols from the crushed tea leaves, a tea polyphenol purification device for purifying a crude solution containing tea polyphenols extracted from the tea polyphenol extraction device, and a control system, wherein: The frame is provided with an extraction tank, the upper chamber of the extraction tank is a crushing chamber, and the lower chamber is a stirring chamber; the tea crushing device is arranged in the crushing chamber, and the tea polyphenol extraction device is arranged in the stirring chamber; a valve opening and closing device for connecting or disconnecting the crushing chamber and the stirring chamber is also arranged between the crushing chamber and the stirring chamber; The extraction tank is provided with a feed port at the upper end of the crushing chamber; the tea crushing device comprises a crushing assembly and a crushing drive mechanism for driving the crushing assembly to rotate, wherein the crushing assembly comprises a crushing shaft and a crushing knife arranged on the crushing shaft; the crushing shaft is arranged coaxially with the crushing chamber; The valve opening and closing device comprises a first partition, a second partition and a rotary opening mechanism for driving the second partition to rotate, wherein the first partition is installed in the inner cavity of the extraction tank, and a plurality of groups of drop openings are arranged on the first partition, and the plurality of groups of drop openings are arranged along the circumferential direction of the first partition; the second partition is arranged on the upper side of the first partition, and the second partition comprises a rotating part and a plurality of groups of blocking blocks arranged on the rotating part, wherein the rotating part is coaxially arranged with the first partition, and the rotating part is rotatably connected to the first partition; the plurality of groups of blocking blocks are arranged along the circumferential direction of the rotating part; each blocking block is provided with a guiding part for guiding the crushed tea leaves onto the first partition; a torsion spring is provided between the rotating part and the first partition, and the elastic force of the torsion spring causes the second partition to block at the drop opening of the first partition; The rotary opening mechanism comprises a clamping assembly arranged on the rotating part of the second partition plate and a first power drive assembly for driving the clamping assembly to clamp or release the crushing shaft, wherein the clamping assembly comprises a first clamping block and a second clamping block arranged on the rotating part of the second partition plate; friction plates are arranged on the inner sides of the first clamping block and the second clamping block; a locking structure for limiting the rotation angle of the second partition plate is also arranged between the first partition plate and the second partition plate; When the crushing chamber and the stirring chamber need to be connected, the control system controls the first power drive assembly to drive the first clamping block and the second clamping block to clamp the crushing shaft; when the second partition plate rotates to be offset from the drop opening of the first partition plate, the locking structure restricts the second partition plate from continuing to rotate; When the crushing chamber and the mixing chamber need to be closed, the control system controls the first power drive assembly to drive the first clamping block and the second clamping block to release the crushing shaft, and the second partition plate rotates in the opposite direction under the elastic force of the torsion spring; when the second partition plate rotates to coincide with the blanking opening of the first partition plate, the locking structure restricts the second partition plate from continuing to rotate; The tea polyphenols purification device includes a bracket, a purification tank arranged on the bracket, a filtering component arranged in the purification tank, and a pressurizing mechanism for pressurizing the crude dissolved liquid in the purification tank to force the crude dissolved liquid in the purification tank to pass through the filtering component; a solution conveying device for conveying the crude dissolved liquid is arranged between the liquid inlet of the purification tank and the liquid outlet in the stirring chamber of the extraction tank.

2. The tea polyphenols continuous extraction equipment according to claim 1, characterized in that: The crushing drive mechanism comprises a drive motor; the drive motor is mounted on the frame, and the main shaft of the drive motor is connected to the crushing shaft through a first belt transmission mechanism.

3. The tea polyphenols continuous extraction equipment according to claim 2, characterized in that: The tea polyphenols extraction device comprises a filter cartridge arranged in the stirring chamber and a stirring mechanism arranged in the filter cartridge, wherein: A liquid inlet is provided in the stirring chamber, and the liquid inlet is connected to the extraction liquid conveying device; The filter cylinder is coaxially arranged with the stirring chamber, the upper end of the filter cylinder is provided with a guide portion for guiding the crushed tea leaves into the inner cavity of the filter cylinder, and the outer side is provided with multiple groups of filter mesh holes; The stirring mechanism includes a stirring component arranged in the filter cylinder and a stirring drive mechanism for driving the stirring component to rotate, wherein the stirring component includes a stirring shaft and stirring blades arranged on the stirring shaft; the stirring shaft is coaxially arranged with the filter cylinder, and the upper end of the stirring shaft is connected to the lower end of the crushing shaft through a reducer; the reducer is installed at the lower end of the first partition, the input shaft of the reducer is connected to the crushing shaft, and the output shaft is connected to the stirring shaft.

4. The tea polyphenols continuous extraction equipment according to claim 3, characterized in that: The lower end of the stirring chamber is provided with a first discharge port, the first discharge port is located inside the filter cylinder, and the first discharge port is provided with a first discharge device for discharging tea residues in the filter cylinder; the first discharge device includes a first discharge platform and a first discharge drive mechanism for driving the first discharge platform to rise and fall, wherein: The first unloading platform is coaxially arranged with the filter cylinder, and the upper end of the first unloading platform is conical and matched with the first unloading port; a plurality of guide rods are arranged at the lower end of the first unloading platform, and a mounting frame is arranged at the bottom of the extraction tank, and a guide hole matched with the guide rod is arranged on the mounting frame; a return spring is arranged between the guide rod and the mounting frame, and the return spring is sleeved on the guide rod, and the elastic force of the return spring causes the first unloading platform to block upward at the first unloading port; The first unloading drive mechanism includes a screw shaft arranged at the bottom of the stirring shaft, a first push rod arranged at the bottom of the first unloading platform, and a second power drive assembly for driving the first push rod to extend into the spiral groove in the screw shaft, wherein: The bottom of the stirring shaft is provided with a first sleeve portion at a position corresponding to the screw shaft; a second sleeve portion is provided at the center of the first unloading platform; the second sleeve portion is located on the inner side of the first sleeve portion, and the outer circumferential surface of the second sleeve portion is in contact with the inner circumferential surface of the first sleeve portion; the lower end of the screw shaft passes through the axis of the first unloading platform, and a avoidance hole for avoiding the screw shaft is provided at the center of the first unloading platform; The outer surface of the screw shaft is provided with a spiral groove and an annular groove connected to the bottom of the spiral groove, wherein the spiral groove is located at the upper end of the screw shaft, and the annular groove is located at the lower end of the screw shaft; A fixed seat is provided at the bottom of the first unloading platform, and the second power drive assembly is installed on the fixed seat; the first push rod is slidably connected to the fixed seat, and the axial direction of the first push rod is perpendicular to the axial direction of the screw shaft; When the tea residue at the bottom of the filter cartridge needs to be discharged, the control system controls the second power drive assembly to drive the first push rod to extend into the spiral groove of the screw shaft; when the tea residue at the bottom of the filter cartridge is completely discharged, the control system controls the second power drive assembly to drive the first push rod to withdraw from the annular groove of the screw shaft.

5. The tea polyphenols continuous extraction equipment according to claim 4, characterized in that: The pressurizing mechanism includes a lifting seat, a pressurizing piston disposed on the lifting seat, and a pressurizing driving mechanism for driving the pressurizing piston to perform vertical reciprocating motion, wherein: The pressurizing piston is arranged on the outer side of the filter assembly and is coaxially arranged with the filter assembly. The pressurizing piston is installed on the lifting seat through a sliding rod; the lower end of the sliding rod is installed on the pressurizing piston, and the upper end is installed on the lifting seat; the bracket is provided with a sliding hole that cooperates with the sliding rod; a circular scraper ring is provided at the bottom of the pressurizing piston, and the circular scraper ring is installed at the middle part of the pressurizing piston. The circular scraper ring is coaxially arranged with the pressurizing piston and is located on the outer side of the filter assembly; the bottom of the circular scraper ring is provided with a scraper portion that contacts the outer circumferential surface of the filter assembly; The pressurizing drive mechanism includes a bidirectional screw mounted on the bracket and a power drive mechanism for driving the bidirectional screw to rotate, wherein the upper end of the bidirectional screw is connected to the main shaft of the driving motor through a second belt transmission mechanism, and the lower end extends vertically downward; a screw nut cooperating with the bidirectional screw is provided on the lifting seat.

6. The tea polyphenols continuous extraction equipment according to claim 5, characterized in that: The pressurizing drive mechanism also includes a stroke adjustment mechanism for adjusting the descending height of the pressurizing piston, and the stroke adjustment mechanism includes an adjustment seat arranged above the lifting seat and an adjustment drive mechanism for driving the adjustment seat to rise and fall, wherein: The adjustment seat is connected to the bracket through a guide shaft, and the bracket is provided with a guide hole matched with the guide shaft; the adjustment seat is rotatably connected with a rotating sleeve, the lower end of the rotating sleeve is connected to the bidirectional screw rod, and the upper end is installed with a driven gear; the bracket is provided with a guide shaft at the upper end of the rotating sleeve; the upper end of the guide shaft is fixed to the bracket, and the lower end extends vertically into the rotating sleeve; The adjustment drive mechanism comprises a transmission shaft and a driving gear arranged on the transmission shaft, wherein the upper end of the transmission shaft is rotatably connected to the bracket and is connected to the main shaft of the driving motor through a second belt transmission mechanism; the lower end of the transmission shaft extends vertically downward and is provided with a bidirectional spiral section; a second push rod and a third power drive assembly for driving the second push rod to enter the bidirectional spiral section are provided on the adjustment seat, wherein the axial direction of the second push rod is perpendicular to the axial direction of the transmission shaft; The bracket is provided with a height detection sensor for detecting the height position of the adjustment seat; When it is necessary to increase the descending height of the pressurizing piston, the control system controls the third power drive component to drive the second push rod to enter the bidirectional spiral section; when the height detection sensor detects that the adjustment seat has dropped to a predetermined height, the control system controls the third power drive component to drive the second push rod to exit the bidirectional spiral section.

7. The tea polyphenols continuous extraction equipment according to claim 6, characterized in that: The bottom of the purification tank is provided with a second discharge port, and a second discharge device is provided at the second discharge port; the second discharge device comprises a support frame provided at the bottom of the purification tank, a second discharge platform provided on the support frame, and a second discharge drive mechanism for driving the second discharge platform to rise and fall, wherein: The purification tank is provided with a circular tube rack coaxially arranged therewith, the upper end of the circular tube rack is slidably connected to the lifting seat, and the lower end is connected to the liquid outlet pipe; the liquid outlet pipe is fixed on the support frame; a plurality of openings are provided in the central area of ​​the circular tube rack located in the purification tank; the filter assembly is sleeved in the middle area of ​​the circular tube rack; The central hole of the second unloading platform is sleeved on the liquid outlet pipe, and a compression spring is arranged between the second unloading platform and the support frame; the compression spring is sleeved on the liquid outlet pipe, the lower end of the compression spring acts on the support frame, and the upper end acts on the second unloading platform; the elastic force of the compression spring causes the second unloading platform to block upward at the second unloading port; A locking structure is provided between the second unloading platform and the supporting frame; the locking structure includes a locking block arranged on the supporting frame; the second unloading platform is provided with a horizontal matching portion at a position corresponding to the locking block; the locking block is slidably connected to the supporting frame via a connecting shaft; a locking spring is provided between the supporting frame and the locking block, the locking spring is sleeved on the connecting shaft, and the elastic force of the locking spring causes the locking block to rest against the lower end of the horizontal matching portion of the second unloading platform.

8. The tea polyphenols continuous extraction equipment according to claim 7, characterized in that: The second unloading drive mechanism includes a driving shaft, a driving block arranged on the driving shaft, and a driving wheel arranged at the lower end of the driving block, wherein the upper end of the driving shaft vertically passes through the bottom of the purification tank, and the purification tank is provided with a sliding hole matching therewith at a position corresponding to the driving shaft; the driving block is located on the outside of the purification tank and above the horizontal matching part of the second unloading platform; the driving wheel is vertically rotatably connected to the bottom of the driving shaft; the locking block is provided with a horizontal locking part and an inclined part, and the driving wheel is located above the inclined part.

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