A coffee liquid extraction device

Abstract

This utility model relates to the field of coffee liquid production technology, and in particular to a coffee liquid extraction device, including a heating water tank. A spray structure is fixedly installed in the middle of the upper part of the heating water tank, and an extraction structure is fixedly installed in the right end of the spray structure. A weighing filter structure is fixedly installed in the lower part of the outer surface of the extraction structure. In this coffee liquid extraction device, a second pump draws hot water, which is adjusted to a suitable water pressure by a pressure regulator. The water is then evenly sprayed onto coffee powder through a ring-shaped array of inwardly inclined spray nozzles on a ring tube. The combination of high-temperature hot water and suitable pressure allows for rapid and thorough saturation of the coffee powder, enabling more efficient dissolution of both large and small molecule flavor substances, extracting a richer variety of flavor compounds, achieving a more balanced bitterness and acidity in the coffee, and releasing a more intense aroma. Compared to traditional methods, the extraction efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of coffee liquid production technology, and in particular to a coffee liquid extraction device. Background Technology

[0002] With the popularization of coffee culture and the upgrading of consumption, the market demand for high-quality coffee liquid continues to grow. In the field of coffee liquid production, traditional processes use cold extraction or weak extraction methods. The core principle is to utilize the solubility of flavor substances in coffee powder in water at low temperatures. Through long-term soaking, small-molecule flavor substances such as floral aromas and acids slowly dissolve in water, thereby achieving coffee liquid extraction. However, this extraction method is time-consuming and has extremely low production efficiency, making it difficult to meet the needs of large-scale industrial production. Furthermore, the poor solubility of substances at low temperatures not only results in a low extraction amount of large-molecule flavor substances, such as tannins that give coffee its full-bodied taste, but also leads to an imbalance in the acidity and bitterness of the coffee liquid, resulting in a bland taste and insufficient flavor complexity. Therefore, we have launched a coffee liquid extraction device. Utility Model Content

[0003] The main objective of this invention is to provide a coffee extraction device that can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A coffee extraction device includes a heating water tank. A spray structure is fixedly installed at the upper middle part of the heating water tank. An extraction structure is fixedly installed at the right end of the spray structure. A weighing filter structure is fixedly installed at the lower outer surface of the extraction structure. A U-shaped bracket is fixedly connected to the weighing filter structure. A centrifuge chamber is fixedly connected at the lower right end of the weighing filter structure. A high-speed centrifuge is fixedly installed at the upper middle part of the centrifuge chamber. A first extraction tube is fixedly connected at the lower outer surface of the centrifuge chamber. A first extraction pump is fixedly installed at the right end of the first extraction tube. A first one-way solenoid valve is movably installed on the outer surface of the first extraction tube. A first delivery tube is fixedly installed on the outer surface of the first extraction pump. A constant temperature storage tank is fixedly connected at the lower right end of the first delivery tube. A constant temperature controller is fixedly installed at the upper middle part of the constant temperature storage tank. A filling tube is fixedly connected at the lower outer surface of the constant temperature storage tank. A second one-way solenoid valve is movably installed on the outer surface of the filling tube.

[0006] Preferably, the heating water tank includes a tank body, an inlet pipe is fixedly connected to the upper left side of the tank body, a third one-way solenoid valve is movably installed on the outer surface of the inlet pipe, an electric heater is installed inside the tank body, and the power cord of the electric heater is fixedly connected to the left end of the tank body, a temperature sensor is fixedly installed on the upper right side of the tank body, and a control panel is provided at the front end of the tank body.

[0007] By adopting the above technical solution: the control panel is equipped with an "STM32H743ZIT6 chip", which can quickly process the operation of this device and ensure a stable and efficient extraction process;

[0008] The electric heater uses a "YSR type stainless steel electric heating tube", which can adapt to the long-term high-temperature water environment inside the tank and heats up quickly, rapidly heating the water inside the tank to the required temperature.

[0009] The temperature sensor used is the "DS18B20 digital temperature sensor", with a temperature measurement range of -55℃ to 125℃, which meets the monitoring requirements of water temperature for coffee extraction.

[0010] Preferably, the spray structure includes a second extraction pump, a second extraction pipe is fixedly installed at the lower end of the second extraction pump, a second delivery pipe is fixedly installed at the upper end of the second extraction pump, a fourth one-way solenoid valve and a pressure regulator are movably installed on the outer surface of the second delivery pipe, and the fourth one-way solenoid valve is located to the left of the pressure regulator. An annular pipe is fixedly connected to the right end of the second delivery pipe, and a plurality of spray heads are fixedly installed on the lower part of the outer surface of the annular pipe. The lower end of the second extraction pump is fixedly connected to the upper end of the housing.

[0011] By adopting the above technical solution: the pressure regulator selected is the "FESTO LFR-1 / 4-D-7-MAXI-AP type precision pressure regulator", which can meet the water pressure control requirements during the coffee extraction process.

[0012] Several spray heads are all "Lechler 642.123 hollow cone tangential spray heads", which can produce a uniform hollow cone spray pattern, enabling hot water to evenly cover the surface of coffee powder.

[0013] Preferably, the extraction structure includes an extraction chamber and a lid. A conical extraction hopper is fixedly fitted inside the middle of the extraction chamber. An extraction filter screen is embedded in the upper part of the inner wall of the conical extraction hopper. A sealing sleeve is fixedly connected to the lower end of the lid, and a handle is fixedly connected to the middle of the upper end of the lid.

[0014] By adopting the above technical solution: using a 200-mesh filter, the fine pores can intercept coffee grounds, allowing only coffee liquid to pass through, effectively preventing impurities from entering and affecting the taste. At the same time, the filter plays a moderate role in intercepting large molecules in the coffee liquid, preserving the rich taste and flavor substances of coffee, making the extracted coffee liquid clear and transparent, with a pure taste and rich layers.

[0015] Preferably, the lid is located on the extraction chamber, and the sealing sleeve is movably fitted inside the extraction chamber and in close contact with the inner wall of the extraction chamber.

[0016] By adopting the above technical solution, the tightly sealed structure completely isolates the inside of the extraction chamber from the external environment, effectively preventing dust or bacteria from entering.

[0017] Preferably, the lower end of the second extraction tube penetrates the upper end of the box and extends into the box, and the right end of the second delivery tube penetrates the outer surface of the extraction box and extends into the extraction box.

[0018] By adopting the above technical solution, the lower end of the second extraction pipe penetrates through the upper end of the tank and extends into the tank, allowing hot water to be extracted directly from the tank.

[0019] Preferably, the annular tube is fixedly sleeved inside the extraction chamber, and the annular tube is located above the conical extraction hopper. A plurality of spray heads are arranged in a circular array around the center of the annular tube, and the lower part of the plurality of spray heads is inclined inward around the center of the annular tube.

[0020] By adopting the above technical solution: the annular tube is fixedly sleeved inside the extraction box and located above the conical extraction hopper, and several spray heads are distributed in a circular array around the center of the annular tube, so that hot water can be evenly sprayed onto the coffee powder in the conical extraction hopper from multiple directions.

[0021] Preferably, the weighing and filtering structure includes a third extraction pump, an automatic weighing device, a dual filter, and a fourth extraction pump. A third extraction pipe is fixedly installed at the left end of the third extraction pump. A fifth one-way solenoid valve is movably installed on the outer surface of the third extraction pipe. A third delivery pipe is fixedly installed on the outer surface of the third extraction pump. A weighing collection tank is fixedly connected to the upper end of the automatic weighing device. A fourth extraction pipe is fixedly installed at the front end of the fourth extraction pump. A sixth one-way solenoid valve is movably installed on the outer surface of the fourth extraction pipe. A fourth delivery pipe is fixedly installed on the outer surface of the fourth extraction pump. A fifth delivery pipe is fixedly connected to the lower rear end of the weighing collection tank. A seventh one-way solenoid valve is movably installed on the outer surface of the fifth delivery pipe.

[0022] By adopting the above technical solution: the automatic weighing device uses "Mettler-Toledo IND245 weighing instrument paired with SBH series weighing sensor", which can quickly capture changes in the weight of coffee liquid;

[0023] The dual filter uses a 3M PPS20-40 dual filter with a 3M FP050-C all-purpose filter cartridge, which can effectively intercept coffee grounds and has no adsorption effect on flavor substances in coffee liquid, ensuring that the taste and aroma of coffee are not affected.

[0024] Preferably, the lower end of the automatic weighing device is fixedly connected to the upper end of the U-shaped base, and the lower end of the dual filter is fixedly connected to the lower inner wall surface of the U-shaped base.

[0025] Preferably, the left end of the third extraction tube penetrates the outer surface of the extraction chamber and extends into the extraction chamber; the lower right end of the third delivery tube penetrates the upper end of the weighing and collecting tank and extends into the weighing and collecting tank; the lower front end of the fifth delivery tube penetrates the upper outer surface of the dual filter and extends into the dual filter; the front end of the fourth extraction tube penetrates the lower outer surface of the dual filter and extends into the dual filter; and the lower right end of the fourth delivery tube penetrates the upper end of the centrifuge and extends into the centrifuge.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. In this invention, the electric heater quickly heats the water inside the chamber, and the temperature sensor provides real-time feedback to ensure the water temperature. Compared with traditional low-temperature extraction, the high-temperature environment significantly improves the solubility of flavor substances in coffee powder and shortens the extraction time. In the spray extraction stage, the second pump draws hot water, which is adjusted to a suitable water pressure by the pressure regulator. Then, it is evenly sprayed onto the coffee powder through a spray nozzle arranged in a ring array and tilted inward on the ring tube. The combination of high-temperature hot water and suitable pressure can quickly and fully saturate the coffee powder, making the large and small molecules of flavor substances in the coffee powder dissolve more efficiently, extracting richer flavor substances, achieving a more moderate balance between the bitterness and acidity of the coffee, and releasing a richer aroma. Compared with the traditional method, the extraction efficiency is improved.

[0028] 2. In this invention, after extraction, the coffee liquid is quantitatively filtered and then filtered twice by a weighing and filtration structure. A small amount of oil is then separated by centrifugation in a high-speed centrifuge. This oil floats on the surface of the coffee liquid, which not only makes the coffee liquid more shiny and enhances its visual appeal, but also further enriches the taste and aroma of the coffee. Finally, the coffee liquid is kept at a constant temperature in a constant temperature storage tank by a constant temperature controller to ensure stable quality until it is filled through a filling tube. The entire process is automated from extraction to filling by a chip in the control panel that controls the coordinated operation of each component. This ensures that the coffee liquid has a rich flavor and mellow taste while significantly shortening the production cycle and improving overall production efficiency. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of a coffee liquid extraction device according to the present invention;

[0030] Figure 2 This is a schematic diagram of the heating water tank of a coffee extraction device according to the present invention;

[0031] Figure 3 This is a schematic diagram of the spray structure of a coffee liquid extraction device according to the present invention;

[0032] Figure 4 This is an exploded view of the extraction structure of a coffee liquid extraction device according to the present invention (the extraction chamber is cut out).

[0033] Figure 5 This is a schematic diagram of the weighing and filtering structure of a coffee liquid extraction device according to the present invention;

[0034] Figure 6 This is a rear view of the weighing and filtering structure of a coffee extraction device according to this utility model.

[0035] In the diagram: 1. Heating water tank; 2. Spray structure; 3. Extraction structure; 4. Weighing and filtration structure; 5. U-shaped base; 6. Centrifuge box; 7. High-speed centrifuge; 8. First extraction pump; 9. First extraction pipe; 10. First one-way solenoid valve; 11. First delivery pipe; 12. Constant temperature storage tank; 13. Constant temperature controller; 14. Filling pipe; 15. Second one-way solenoid valve; 111. Box body; 112. Water inlet pipe; 113. Third one-way solenoid valve; 114. Electric heater; 115. Temperature sensor; 116. Control panel; 21. Second extraction pump; 22. Second extraction pipe; 23. Second delivery pipe ; 24. Fourth one-way solenoid valve; 25. Pressure regulator; 26. Ring pipe; 27. Spray head; 31. Extraction tank; 32. Tank cover; 33. Conical extraction hopper; 34. Extraction filter screen; 35. Sealing sleeve; 36. Handle; 41. Third extraction pump; 42. Automatic weigher; 43. Dual filter; 44. Fourth extraction pump; 45. Third extraction pipe; 46. Fifth one-way solenoid valve; 47. Third delivery pipe; 48. Weighing collection tank; 49. Fourth extraction pipe; 491. Sixth one-way solenoid valve; 492. Fourth delivery pipe; 493. Fifth delivery pipe; 494. Seventh one-way solenoid valve. Detailed Implementation

[0036] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0037] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] Please see Figure 1-6 This utility model provides a technical solution:

[0040] A coffee extraction device includes a heating water tank 1, a spray structure 2 fixedly installed at the upper middle of the heating water tank 1, an extraction structure 3 fixedly installed at the right end of the spray structure 2, a weighing filter structure 4 fixedly installed at the lower outer surface of the extraction structure 3, a U-shaped seat 5 fixedly connected to the weighing filter structure 4, a centrifuge box 6 fixedly connected at the lower right end of the weighing filter structure 4, a high-speed centrifuge 7 fixedly installed at the upper middle of the centrifuge box 6, and a first extraction tube 9 fixedly connected at the lower outer surface of the centrifuge box 6. A first extraction pump 8 is fixedly installed at the right end of the extraction tube 9. A first one-way solenoid valve 10 is movably installed on the outer surface of the first extraction tube 9. A first delivery tube 11 is fixedly installed on the outer surface of the first extraction pump 8. A constant temperature storage tank 12 is fixedly connected to the lower right part of the first delivery tube 11. A constant temperature controller 13 is fixedly installed in the middle of the upper end of the constant temperature storage tank 12. A filling tube 14 is fixedly connected to the lower part of the outer surface of the constant temperature storage tank 12. A second one-way solenoid valve 15 is movably installed on the outer surface of the filling tube 14.

[0041] In this embodiment, the heating water tank 1 includes a tank body 111. A water inlet pipe 112 is fixedly connected to the upper left side of the tank body 111. A third one-way solenoid valve 113 is movably installed on the outer surface of the water inlet pipe 112. An electric heater 114 is installed inside the tank body 111, and the power cord of the electric heater 114 is fixedly connected to the left end of the tank body 111. A temperature sensor 115 is fixedly installed on the upper right side of the tank body 111. A control panel 116 is provided at the front end of the tank body 111. The spray structure 2 includes a second extraction pump 21. A second extraction pipe 22 is fixedly installed at the lower end of the second extraction pump 21. A second delivery pipe 23 is fixedly installed at the upper end of the second extraction pump 21. A fourth one-way solenoid valve 113 is movably installed on the outer surface of the second delivery pipe 23. The second delivery pipe 23 is connected to the right end of the second delivery pipe 23 and the pressure regulator 25, with the fourth one-way solenoid valve 24 located to the left of the pressure regulator 25. A ring pipe 26 is inserted and fixedly connected to the right end of the second delivery pipe 23. Several spray heads 27 are inserted and fixedly installed on the lower part of the outer surface of the ring pipe 26. The lower end of the second extraction pump 21 is fixedly connected to the upper end of the box body 111. The extraction structure 3 includes an extraction box 31 and a box cover 32. A conical extraction hopper 33 is fixedly sleeved in the middle of the extraction box 31. An extraction filter screen 34 is embedded in the upper part of the inner wall of the conical extraction hopper 33. A sealing sleeve 35 is fixedly connected to the lower end of the box cover 32. A handle 36 is fixedly connected to the middle of the upper end of the box cover 32. The box cover 32 is located on the extraction box 31, and the sealing sleeve 35 is movably sleeved in the extraction box 31 and is connected to the extraction box 31. The inner wall surface of the second extraction tube 22 is in close contact with the upper end of the box 111 and extends into the box 111. The right end of the second delivery tube 23 penetrates the outer surface of the extraction box 31 and extends into the extraction box 31. The annular tube 26 is fixedly sleeved in the extraction box 31 and is located above the conical extraction hopper 33. Several spray heads 27 are arranged in a circular array around the center of the annular tube 26, and the lower part of the several spray heads 27 is inclined inward around the center of the annular tube 26. The weighing and filtering structure 4 includes a third extraction pump 41, an automatic weigher 42, a dual filter 43 and a fourth extraction pump 44. The third extraction tube 45 is fixedly installed on the left end of the third extraction pump 41, and the outer surface of the third extraction tube 45 is movably inserted. The system is equipped with a fifth one-way solenoid valve 46, a third delivery pipe 47 is fixedly installed on the outer surface of the third extraction pump 41, a weighing collection tank 48 is fixedly connected to the upper end of the automatic weighing device 42, a fourth extraction pipe 49 is fixedly installed at the front end of the fourth extraction pump 44, a sixth one-way solenoid valve 491 is movably installed on the outer surface of the fourth extraction pipe 49, a fourth delivery pipe 492 is fixedly installed on the outer surface of the fourth extraction pump 44, a fifth delivery pipe 493 is fixedly connected to the lower rear end of the weighing collection tank 48, and a seventh one-way solenoid valve 494 is movably installed on the outer surface of the fifth delivery pipe 493; the lower end of the automatic weighing device 42 is fixedly connected to the upper end of the U-shaped seat 5, and the lower end of the double filter 43 is fixedly connected to the lower inner wall of the U-shaped seat 5.The left end of the third extraction tube 45 penetrates the outer surface of the extraction tank 31 and extends into the extraction tank 31; the lower right end of the third delivery tube 47 penetrates the upper end of the weighing and collecting tank 48 and extends into the weighing and collecting tank 48; the lower front end of the fifth delivery tube 493 penetrates the upper outer surface of the dual filter 43 and extends into the dual filter 43; the front end of the fourth extraction tube 49 penetrates the lower outer surface of the dual filter 43 and extends into the dual filter 43; the lower right end of the fourth delivery tube 492 penetrates the upper end of the centrifuge box 6 and extends into the centrifuge box 6.

[0042] It should be noted that this utility model is a coffee extraction device. In use, the third one-way solenoid valve 113 on the water inlet pipe 112 is opened via a chip in the control panel 116 to inject clean water into the chamber 111. The water temperature is set to 105℃ on the control panel 116. The control panel 116 then activates the electric heater 114 to heat the water in the chamber 111. The temperature sensor 115 monitors the water temperature in real time and sends the data back to the control panel 116. When the water temperature reaches 105℃, the electric heater 114 stops working. The chamber lid 32 is opened via the handle 36, and coffee powder is evenly spread on the extraction filter 34. The lid 32 is then closed, so that the sealing sleeve 35 is fitted over the extraction filter. The chamber 31 is sealed. The second extraction pump 21 in the spray structure 2 is activated, drawing hot water heated to 105°C from the heating water tank 1 through the second extraction pipe 22 and delivering it through the second delivery pipe 23. Simultaneously, the pressure regulator 25 is adjusted to a suitable water pressure via the control panel 116, and the fourth one-way solenoid valve 24 is opened. The hot water enters the annular pipe 26 and is evenly sprayed onto the coffee grounds on the extraction filter screen 34 of the conical extraction hopper 33 inside the extraction chamber 31 by several spray heads 27 arranged in a circular array and tilted inward, fully saturating the coffee grounds. The coffee liquid flows through the extraction filter screen 34 to the bottom of the extraction chamber 31. After extraction, the control panel 116 activates the weighing filter structure 4. The third extraction pump 41 and the fifth one-way solenoid valve 46 draw coffee liquid from the extraction tank 31 to the weighing collection tank 48 through the third extraction pipe 45. The automatic weigher 42 displays the weight of the coffee liquid in the weighing collection tank 48 in real time. When the weight of the coffee liquid reaches the set value, the control panel 116 closes the third extraction pump 41 and the fifth one-way solenoid valve 46. Subsequently, the control panel 116 opens the seventh one-way solenoid valve 494, and the coffee liquid flows into the dual filter 43 through the fifth delivery pipe 493 for secondary filtration to further remove impurities. The control panel 116 then opens the fourth extraction pump 44 and the sixth one-way solenoid valve 491, and the coffee liquid is drawn from the dual filter 43 through the fourth extraction pipe 49. The coffee liquid is drawn into the centrifuge chamber 6. Then, the control panel 116 starts the high-speed centrifuge 7 installed on the top of the centrifuge chamber 6 to centrifuge the coffee liquid, quickly separating the oils from the coffee liquid to make the coffee liquid purer. After the centrifugation is completed, the control panel 116 opens the first extraction pump 8 and the first one-way solenoid valve 10, and draws the coffee liquid in the centrifuge chamber 6 into the constant temperature storage tank 12 through the first extraction tube 9. Under the control of the control panel 116, the constant temperature controller 13 automatically adjusts and maintains the constant temperature in the constant temperature storage tank 12 to ensure the stability of the coffee liquid quality. When filling is required, the control panel 116 opens the second one-way solenoid valve 15, and the coffee liquid is output for filling through the filling tube 14.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A coffee liquid extraction apparatus comprising a heated water tank (1), characterised in that: A spray structure (2) is fixedly installed in the middle of the upper end of the heating water tank (1). An extraction structure (3) is fixedly installed in the right end of the spray structure (2). A weighing filter structure (4) is fixedly installed in the lower part of the outer surface of the extraction structure (3). A U-shaped seat (5) is fixedly connected to the weighing filter structure (4). A centrifuge box (6) is fixedly connected in the lower right part of the weighing filter structure (4). A high-speed centrifuge (7) is installed in the middle of the upper end of the centrifuge box (6). A first extraction tube (9) is fixedly connected in the lower part of the outer surface of the centrifuge box (6). The right end of the first extraction tube (9) A first extraction pump (8) is fixedly installed in the middle. A first one-way solenoid valve (10) is movably installed on the outer surface of the first extraction pipe (9). A first delivery pipe (11) is fixedly installed on the outer surface of the first extraction pump (8). A constant temperature storage tank (12) is fixedly connected to the lower right part of the first delivery pipe (11). A constant temperature controller (13) is fixedly installed in the middle of the upper end of the constant temperature storage tank (12). A filling pipe (14) is fixedly connected to the lower part of the outer surface of the constant temperature storage tank (12). A second one-way solenoid valve (15) is movably installed on the outer surface of the filling pipe (14). The heating water tank (1) includes a tank body (111), an inlet pipe (112) is fixedly connected to the upper left side of the tank body (111), a third one-way solenoid valve (113) is movably installed on the outer surface of the inlet pipe (112), an electric heater (114) is provided inside the tank body (111), and the power cord of the electric heater (114) is fixedly connected to the left end of the tank body (111), a temperature sensor (115) is fixedly installed on the upper right side of the tank body (111), and a control panel (116) is provided at the front end of the tank body (111). The spray structure (2) includes a second extraction pump (21), a second extraction pipe (22) is fixedly installed at the lower end of the second extraction pump (21), a second delivery pipe (23) is fixedly installed at the upper end of the second extraction pump (21), a fourth one-way solenoid valve (24) and a pressure regulator (25) are movably installed on the outer surface of the second delivery pipe (23), and the fourth one-way solenoid valve (24) is located to the left of the pressure regulator (25). An annular pipe (26) is fixedly connected to the right end of the second delivery pipe (23), and several spray heads (27) are fixedly installed on the lower part of the outer surface of the annular pipe (26). The lower end of the second extraction pump (21) is fixedly connected to the upper end of the housing (111).

2. A coffee liquid extraction device according to claim 1, characterized in that: The extraction structure (3) includes an extraction box (31) and a box cover (32). A conical extraction bucket (33) is fixedly sleeved in the middle of the extraction box (31). An extraction filter screen (34) is embedded in the upper part of the inner wall of the conical extraction bucket (33). A sealing sleeve (35) is fixedly connected to the lower end of the box cover (32). A handle (36) is fixedly connected to the middle of the upper end of the box cover (32).

3. A coffee liquid extraction device according to claim 2, wherein: The lid (32) is located on the extraction box (31), and the sealing sleeve (35) is movably fitted inside the extraction box (31) and in close contact with the inner wall of the extraction box (31).

4. A coffee liquid extraction device according to claim 1, characterized in that: The lower end of the second extraction tube (22) penetrates the upper end of the box body (111) and extends into the box body (111), and the right end of the second delivery tube (23) penetrates the outer surface of the extraction box (31) and extends into the extraction box (31).

5. A coffee liquid extraction device according to claim 1, characterized in that: The annular tube (26) is fixedly sleeved inside the extraction box (31), and the annular tube (26) is located above the conical extraction hopper (33). A number of spray heads (27) are arranged in a circular array around the center of the annular tube (26), and the lower part of the spray heads (27) is inclined inward around the center of the annular tube (26).

6. A coffee liquid extraction device according to claim 2, characterized in that: The weighing and filtration structure (4) includes a third extraction pump (41), an automatic weigher (42), a dual filter (43), and a fourth extraction pump (44). A third extraction pipe (45) is fixedly installed on the left end of the third extraction pump (41). A fifth one-way solenoid valve (46) is movably installed on the outer surface of the third extraction pipe (45). A third delivery pipe (47) is fixedly installed on the outer surface of the third extraction pump (41). A weighing collection liquid is fixedly connected to the upper end of the automatic weigher (42). The fourth extraction pipe (49) is fixedly installed at the front end of the fourth extraction pump (44) of the weighing collection tank (48). A sixth one-way solenoid valve (491) is movably installed on the outer surface of the fourth extraction pipe (49). A fourth delivery pipe (492) is fixedly installed on the outer surface of the fourth extraction pump (44). A fifth delivery pipe (493) is fixedly connected to the lower rear end of the weighing collection tank (48). A seventh one-way solenoid valve (494) is movably installed on the outer surface of the fifth delivery pipe (493).

7. A coffee liquid extraction device according to claim 6, wherein: The lower end of the automatic weighing device (42) is fixedly connected to the upper end of the U-shaped seat (5), and the lower end of the double filter (43) is fixedly connected to the lower inner wall of the U-shaped seat (5).

8. A coffee liquid extraction device according to claim 6, characterized in that: The left end of the third extraction tube (45) penetrates the outer surface of the extraction tank (31) and extends into the extraction tank (31). The lower right end of the third delivery tube (47) penetrates the upper end of the weighing and collecting tank (48) and extends into the weighing and collecting tank (48). The lower front end of the fifth delivery tube (493) penetrates the upper outer surface of the double filter (43) and extends into the double filter (43). The front end of the fourth extraction tube (49) penetrates the lower outer surface of the double filter (43) and extends into the double filter (43). The lower right end of the fourth delivery tube (492) penetrates the upper end of the centrifuge box (6) and extends into the centrifuge box (6).

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