A coffee extraction concentration system

Abstract

This invention discloses a coffee extraction and concentration system, including an extraction tank with a coffee powder inlet, a water inlet, and a pressurization port at its upper end. The pressurization port is connected to an air pressure pump via a connecting pipe. A residue outlet is located at the lower end of the extraction tank, and a hollow filter cover is detachably connected to the residue outlet. The lower end of the filter cover is connected to an extraction liquid outlet pipe. A secondary filter tank is used for secondary filtration, and a tubular centrifuge is used for centrifugal filtration. An concentration tank has a coffee liquid inlet and a vacuum port at its upper end. A water storage tank has a temporary storage cylinder at its upper end, and a cooling cylinder at its upper end. A vacuum pipe, connected to the temporary storage cylinder at its lower end, extends through the vacuum port of the cooling cylinder and is connected to a vacuum pump via a suction pipe. This invention enables multiple filtrations of the coffee extract, improving coffee quality, and also allows for gas condensation and filtration recovery, reducing the loss of effective coffee substances.

Description

Technical Field

[0001] This invention relates to the field of coffee processing technology, and in particular to a coffee extraction and concentration system. Background Technology

[0002] Coffee, along with tea and cocoa, is known as one of the world's three major beverage plants, consumed by about one-third of the world's population. Its global trade volume is second only to oil. Because coffee contains starch, protein, dietary fiber, sugars, fats, organic acids, caffeine, and abundant aromatic substances, it possesses a unique, mellow flavor and a stimulating effect, gradually becoming an indispensable daily beverage and food ingredient for modern people.

[0003] The processing steps for instant coffee generally include: pretreatment → roasting → grinding → extraction → concentration → drying. Extraction involves extracting the active ingredients from the coffee into water under specific temperature and pressure. Concentration is achieved through vacuum concentration, which facilitates the drying process. Currently, in most coffee processing, coffee powder is directly concentrated after extraction, resulting in an extract containing numerous impurities and ultimately low-quality coffee. Furthermore, during vacuum concentration, the gas extracted contains a large amount of water vapor and coffee volatiles. Releasing this gas directly into the air without treatment leads to excessive moisture and strong odors in the coffee processing workshop. Summary of the Invention

[0004] The purpose of this invention is to provide a coffee extraction and concentration system that can filter coffee extract multiple times to remove impurities and improve coffee quality. During the vacuum concentration process, the gas can be treated before being released, effectively preventing excessive moisture and odor in the workshop. Furthermore, the system can filter and recover the gas to reduce the loss of effective substances in the coffee.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0006] A coffee extraction and concentration system includes an extraction tank supported by a bracket. A first drive motor is installed at the upper end of the extraction tank. The power output shaft of the first drive motor extends into the extraction tank and is connected to an extraction stirrer. The upper end of the extraction tank is provided with a coffee powder inlet, a water inlet, and a pressurization port, all of which are connected to the interior of the extraction tank. The pressurization port is connected to an air pressure pump through a connecting pipe.

[0007] The coffee powder feeding port is detachably connected to an extraction sealing cap. The lower end of the extraction tank has a slag discharge port, which is detachably connected to an internally hollow filter cover. The upper end of the filter cover is a filter mesh plate, and the upper end of the filter mesh plate is equipped with a removable and replaceable primary filter membrane. The lower end of the filter cover is connected to an extraction liquid outlet pipe that communicates with its interior. Multiple vertically downward-oriented electric telescopic rods are installed on the outside of the extraction tank, and the telescopic shaft of each electric telescopic rod is connected to the edge of the filter cover.

[0008] A secondary filter tank is provided, with a filter sealing cover detachably connected to the upper end of the secondary filter tank. A columnar filter screen extending to its opening is provided at the bottom of the secondary filter tank. A removable and replaceable secondary filter membrane is provided on the inner wall of the columnar filter screen. The secondary filter tank is connected to a filter outlet pipe. The extraction outlet pipe and the filter outlet pipe are respectively connected to the inside or outside of the columnar filter screen.

[0009] A tubular centrifuge is used to further centrifuge and filter the filtrate after filtration by the secondary filtration tank.

[0010] The concentration tank has a second drive motor installed at its upper end. The power output shaft of the second drive motor extends into the concentration tank and is connected to a concentration stirrer. The upper end of the concentration tank is provided with a coffee liquid inlet and a vacuum port that are both connected to the interior of the tank. The coffee liquid inlet is detachably connected to a concentration sealing cap. The lower end of the concentration tank is connected to a discharge pipe, and a valve is installed on the discharge pipe.

[0011] The water storage tank has a drain pipe connected to its lower end at the outlet pipe, and a valve installed on the drain pipe. A temporary storage cylinder, not connected to the bottom of the storage tank, is located at the upper end of the tank. The lower part of the outer side of the temporary storage cylinder is connected to the upper part of the water storage tank via a connecting bend pipe, and a valve is installed on the connecting bend pipe. A cooling cylinder is vertically installed at the upper end of the temporary storage cylinder, with a water outlet at its upper end and a water inlet at its lower end. A vacuum tube, with its lower end connected to the interior of the temporary storage cylinder, is installed inside the cooling cylinder. The vacuum tube extends out of the upper end of the cooling cylinder, bends towards the concentration tank, and connects to the vacuum port. A suction pipe is connected upwards to the upper end of the temporary storage cylinder, and the free end of the suction pipe extends upwards through the cooling cylinder and bends downwards to connect to a vacuum pump.

[0012] By adopting the above technical solution, after coffee is ground into coffee powder, it is added into the extraction tank through the coffee powder feeding port. Hot pure water is injected into the tank through a water pipe connected to the water inlet. Driven by the first drive motor, the extraction stirrer stirs and extracts the coffee, so that the effective substances of the coffee are fully dissolved in the water. Then, the air pressure pump is used to pressurize the extraction tank, increasing the internal pressure, so that the coffee extract is discharged after passing through the first-stage filter membrane. When it is necessary to remove the residue from the extraction tank, the electric telescopic rod extends and drives the filter cover to descend and open the residue outlet, so that the residue of the first-stage filter membrane can be cleaned and the first-stage filter membrane can be replaced.

[0013] After being pressurized by air, the extract enters the columnar filter through the extract tube. After passing through the secondary filter membrane, it flows out of the columnar filter and finally flows out of the secondary filter tank through the extract tube. It is then added to a tubular centrifuge for centrifugal filtration, which separates the heavier impurities from the active ingredients in the filtrate, resulting in a purer coffee extract.

[0014] After adding the filtered coffee extract into the condenser through the coffee inlet, the second drive motor and vacuum pump are started. At this time, the valve connecting the curved pipe is closed, and vacuum concentration is performed while stirring. After the vacuum pump creates a vacuum, the pressure inside the condenser decreases, and the boiling point of water decreases. Since hot water was used to extract the coffee from the beginning, the temperature of the coffee extract inside the condenser is higher than room temperature. After the pressure decreases, the water in the condenser boils and evaporates more easily. The evaporated water vapor flows along the vacuum tube. When the gas passes through the vacuum tube inside the cooling cylinder, it is cooled by the use of room temperature tap water. The process involves circulation, during which water vapor gradually condenses on the inner wall of the vacuum tube and flows downwards into the storage cylinder. Finally, it exits through the suction tube to the vacuum pump. As the gas passes through the cooling cylinder in the suction tube, any remaining water vapor condenses again and flows downwards into the storage cylinder, minimizing the amount of water vapor and coffee volatiles in the exhaust gas. After concentration, the valve connecting the curved tube is opened to allow the water in the storage cylinder to flow into the water tank. The valve on the return pipe is then opened to allow the coffee mixture in the conical funnel to flow back into the concentrated coffee liquid, completing the concentration of the coffee extract.

[0015] A further provision of the present invention includes a first storage tank for temporarily storing the filtrate filtered by the secondary filtration tank. The upper end of the first storage tank is connected to a first inlet connected to the filtrate outlet pipe. The upper end of the first storage tank is connected to a first breather valve. The lower end of the first storage tank is connected to a first outlet pipe, and a valve is installed on the first outlet pipe.

[0016] A further provision of the present invention includes a second storage tank for temporarily storing the filtrate filtered by the tubular centrifuge. The upper end of the second storage tank is connected to a second inlet connected to the filtrate outlet pipe. The upper end of the second storage tank is connected to a second breather valve. The lower end of the second storage tank is connected to a second outlet pipe, and a valve is installed on the second outlet pipe.

[0017] A further provision of the present invention is that a vertically arranged telescopic tube is connected between the lower end of the filter cover and the extraction liquid tube, the telescopic tube including an outer sleeve vertically downward from the lower end of the filter cover and an inner sliding tube slidably connected to the inner wall of the outer sleeve and connected to the extraction liquid tube, the lower end of the inner sliding tube being fixed inside the bracket.

[0018] A further provision of the present invention is that: the vacuum tube is connected to a filter recovery tank at the middle of the outside of the cooling cylinder; the bottom of the filter recovery tank is a mesh perforated drainage plate; a conical funnel is provided at the lower end of the filter recovery tank; the lower end of the conical funnel is connected to a recovery pipe connected to the upper end of the concentration tank; a valve is installed in the middle of the recovery pipe; an arc-shaped mesh partition is provided inside the filter recovery tank; the arc surface of the arc-shaped mesh partition faces the water storage tank; and a recovery filter membrane is provided on the side of the arc-shaped mesh partition away from the water storage tank.

[0019] By adopting the above technical solution, the gas generated during vacuum concentration passes through the recovery filter membrane in the filtration and recovery tank. Because the coffee volatiles that evaporate with the water vapor are larger, they cannot pass through the recovery filter membrane. The water vapor will also condense on the recovery filter membrane when it passes through it. The slurry will carry the coffee volatiles remaining on the recovery filter membrane downwards and flow into the conical funnel. After concentration, the valve of the return pipe is opened, so that the coffee mixture in the conical funnel flows back into the concentrated coffee liquid, thus completing the concentration of the coffee extract.

[0020] A further provision of the present invention is that the lower end of the vacuum tube extends into the temporary storage cylinder and is close to its bottom.

[0021] By adopting the above technical solution, since the lower end of the vacuum tube is inside the storage cylinder, as water gradually accumulates inside the storage cylinder, the gas needs to pass through the water in the storage cylinder, causing the residual coffee volatiles to dissolve in the water, which can further reduce the content of coffee volatiles in the exhaust gas.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] Firstly, this invention systematically performs coffee extraction and concentration, effectively improving the efficiency of coffee processing. It employs multi-stage filtration to effectively filter out impurities remaining in the coffee extract, thereby improving the quality of the finished coffee product. It utilizes vacuum concentration for low-temperature concentration, concentrating the coffee extract into a concentrated coffee liquid without damaging the coffee quality, thus effectively ensuring that the quality of the coffee is not compromised.

[0024] Secondly, during vacuum concentration, the extracted gas is condensed to store the water vapor in the air, thereby minimizing the water vapor content in the discharged gas and preventing excessive humidity in the processing workshop after the gas is discharged, which would cause water vapor to condense everywhere in the workshop.

[0025] Thirdly, during vacuum concentration, the present invention filters and recovers the extracted gas, filtering out coffee volatiles from the gas. These volatiles are then returned to the concentration tank along with the condensate to mix with the coffee concentrate. This reduces the loss of effective coffee components and minimizes the content of coffee volatiles in the gas, preventing large amounts of coffee volatiles from being released into the workshop air and causing polluted air to affect the normal work of the staff. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a partial cross-sectional view used to show the internal structure of the extraction tank;

[0028] Figure 3 Used to demonstrate the internal structure of the secondary filter tank;

[0029] Figure 4 This is a schematic diagram of the overall structure of the first liquid storage tank;

[0030] Figure 5 This is a schematic diagram of the overall structure of the second storage tank;

[0031] Figure 6 It is a partial sectional view used to show the internal structure of the concentration tank and the water storage tank;

[0032] Figure 7 It is a partial cross-sectional view used to show the internal structure of the filter recovery tank.

[0033] In the diagram: 1. Extraction tank; 11. Support; 12. First drive motor; 13. Extraction stirrer; 14. Coffee powder inlet; 15. Water inlet; 16. Pressurization port; 17. Extraction sealing cap; 18. Air pressurization pump; 19. Filter cover; 110. Electric telescopic rod; 111. Filter mesh plate; 112. Primary filter membrane; 113. Telescopic tube; 1131. Outer tube; 1132. Inner sliding tube; 114. Extraction outlet tube; 115. Connecting tube; 2. Secondary filter tank; 21. Filter sealing cap; 22. Columnar filter screen; 23. Secondary filter membrane; 24. Filter outlet tube; 3. First storage tank; 31. First inlet; 32. First breather valve; 33. First... 4. Discharge pipe; 5. Tubular centrifuge; 6. Second storage tank; 7. Second inlet; 8. Second breather valve; 9. Second discharge pipe; 10. Concentrator; 11. Second drive motor; 12. Concentrator stirrer; 13. Coffee liquid feeding port; 14. Vacuum port; 15. Concentrator sealing cap; 16. Discharge pipe; 17. Water storage tank; 18. Drain pipe; 19. Temporary storage cylinder; 20. Connecting bend pipe; 10. Cooling cylinder; 11. Water outlet; 12. Water inlet; 13. Vacuum pipe; 14. Suction pipe; 15. Vacuum pump; 16. Filter recovery tank; 17. Mesh perforated plate; 18. Conical funnel; 19. Recovery pipe; 20. Arc-shaped mesh partition; 20. Recovery filter membrane; 21. Valve. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings.

[0035] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 invention.

[0036] Example, refer to Figure 1-7 A coffee extraction and concentration system includes an extraction tank 1 supported by a bracket 11. A first drive motor 12 is installed at the upper end of the extraction tank 1. The power output shaft of the first drive motor 12 extends into the extraction tank 1 and is connected to an extraction stirrer 13. The upper end of the extraction tank 1 is provided with a coffee powder inlet 14, a water inlet 15, and a pressurization port 16, all of which are connected to the interior of the extraction tank 1. An extraction sealing cover 17 is detachably connected to the coffee powder inlet 14. The extraction sealing cover 17 is hinged to one side of the coffee powder inlet 14. The water inlet 15 is directly connected to a water pipe. The pressurization port 16 is connected to an air pressure pump 18 through a connecting pipe 115.

[0037] The lower end of the extraction tank 1 is provided with a slag discharge port (not shown). The slag discharge port is detachably connected to a hollow filter cover 19. Two electric telescopic rods 110 are installed on the outside of the extraction tank 1, which are symmetrically arranged and vertically downward. The telescopic shaft of each electric telescopic rod 110 is connected to the edge of the filter cover 19. The telescopic movement of the electric telescopic rods 110 controls the opening and closing of the slag discharge port. The upper end of the filter cover 19 is a filter mesh plate 111. A removable and replaceable primary filter membrane 112 is provided on the upper end of the filter mesh plate 111 for coarse filtration of coffee. The lower end of the filter cover 19 is connected to a vertically arranged telescopic tube 113. The telescopic tube 113 includes an outer tube 1131 that extends vertically downward from the lower end of the filter cover 19 and an inner sliding tube 1132 that is slidably connected to the inner wall of the outer tube 1131. The lower end of the inner sliding tube 1132 is fixed in the bracket 11, and the lower end of the inner sliding tube 1132 is connected to an extraction liquid tube 114.

[0038] After the coffee is ground into coffee powder, it is added into the extraction tank 1 through the coffee powder feeding port 14. Hot purified water is injected into the tank through the water inlet 15 connected to the water pipe. Driven by the first drive motor 12, the extraction stirrer 13 stirs and extracts the coffee, so that the effective substances of the coffee are fully dissolved in the water. Then, the air pressure pump 18 is used to pressurize the extraction tank 1, increasing the internal pressure, so that the coffee extract is discharged after passing through the primary filter membrane 112. When it is necessary to remove the residue from the extraction tank 1, the electric telescopic rod 110 extends and drives the filter cover 19 to descend and open the residue outlet, so that the residue of the primary filter membrane 112 can be cleaned and the primary filter membrane 112 can be replaced.

[0039] Two secondary filter tanks 2 are provided. Each secondary filter tank 2 has a detachable filter sealing cap 21 at its upper end. A columnar filter screen 22, extending upwards from the bottom of each secondary filter tank 2 to its opening, is installed. A removable and replaceable secondary filter membrane 23 is installed on the inner wall of the columnar filter screen 22. A filter outlet pipe 24, which is a T-junction, is connected to the side walls of the two secondary filter tanks 2. The other two ends of the filter outlet pipe 24 are connected to the two filter sealing caps 21 respectively. An extraction outlet pipe 114 communicates with the interior and exterior of the columnar filter screen 22. The extract, after being pressurized by air, enters the columnar filter screen 22 through the extraction outlet pipe 114, passes through the secondary filter membrane 23, flows out of the columnar filter screen 22, and finally flows out of the secondary filter tank 2 through the extraction outlet pipe 114.

[0040] The first storage tank 3 is used to temporarily store the filtrate after filtration by the secondary filter tank 2. The upper end of the first storage tank 3 is connected to a first inlet 31 connected to the filtrate outlet pipe 24. The upper end of the first storage tank 3 is also connected to a first breather valve 32 to maintain the pressure balance inside and outside the first storage tank 3 and to filter incoming air. The lower end of the first storage tank 3 is connected to a first outlet pipe 33, on which a valve 9 is installed. The filtrate after filtration by the secondary filter tank 2 flows directly into the first storage tank 3 through the extraction outlet pipe 114 for temporary storage.

[0041] The tubular centrifuge 4 is used to further centrifuge the filtrate from the secondary filter tank 2. The tubular centrifuge 4 is a GQ76 model purchased from Shanghai Daibao Machinery Equipment Co., Ltd. The tubular centrifuge 4 utilizes high-speed centrifugation to separate heavier impurities from the active ingredients in the filtrate, ultimately yielding a purer coffee extract.

[0042] The second storage tank 5 is used for temporary storage of the filtrate after filtration by the tubular centrifuge 4. The upper end of the second storage tank 5 is connected to a second inlet 51 and a second breather valve 52 to maintain pressure balance inside and outside the tank and filter incoming air. The lower end of the second storage tank 5 is connected to a second outlet pipe 53, on which a valve 9 is installed. The filtrate, after final filtration by the tubular centrifuge 4, is manually added to the second storage tank 5 through the second inlet 51 for temporary storage.

[0043] The concentration tank 6 has a second drive motor 61 installed at its upper end. The power output shaft of the second drive motor 61 extends into the concentration tank 6 and is connected to a concentration stirrer 62. The upper end of the concentration tank 6 is provided with a coffee liquid inlet 63 and a vacuum port 64, both of which are connected to the interior of the tank. A concentration sealing cover 65 is detachably connected to the coffee liquid inlet 63. The concentration sealing cover 65 is hinged to one side of the coffee liquid inlet 63. The lower end of the concentration tank 6 is connected to a discharge pipe 66, and a valve 9 is installed on the discharge pipe 66.

[0044] The water storage tank 7 has a drain pipe 71 connected to the lower end of its outlet pipe. A valve 9 is installed on the drain pipe 71. A temporary storage cylinder 72, whose bottom is not connected to the storage tank 7, is located at the upper end of the water storage tank 7. The lower part of the outer side of the temporary storage cylinder 72 is connected to the upper part of the water storage tank 7 via a connecting bend 73, facilitating the transfer of water from the temporary storage cylinder 72 to the water storage tank 7. A valve 9 is installed on the connecting bend 73. A cooling cylinder 74 is vertically installed at the upper end of the temporary storage cylinder 72. A water outlet 75 is connected to the upper end of the cooling cylinder 74, and a water inlet 76 is connected to the lower end of the cooling cylinder 74. Tap water is added through the water inlet 76 and flows out through the water outlet 75, forming a water-cooled circulation system. A vacuum tube 77 is installed inside the cooling cylinder 74, with its lower end connected to the interior of the temporary storage cylinder 72. The lower end of the vacuum tube 77 extends into the temporary storage cylinder 72 and is close to its bottom, allowing it to be submerged in water. Any remaining coffee volatiles in the gas can dissolve in the water. The upper end of the vacuum tube 77 extends out of the cooling cylinder 74, bends towards the condenser 6, and connects to the vacuum port 64. A suction tube 78 is connected upwards to the upper end of the temporary storage cylinder 72. The free end of the suction tube 78 extends upwards out of the cooling cylinder 74 and then bends downwards to connect to a vacuum pump 79.

[0045] A vacuum tube 77 is connected to a filter recovery tank 8 at the middle of the cooling cylinder 74. The bottom of the filter recovery tank 8 is a perforated drainage plate 81. A conical funnel 82 is installed at the lower end of the filter recovery tank 8. The lower end of the conical funnel 82 is connected to a recovery pipe 83 that connects to the upper end of the concentration tank 6. A valve 9 is installed in the middle of the recovery pipe 83. An arc-shaped perforated baffle 84 is installed inside the filter recovery tank 8. The arc surface of the arc-shaped perforated baffle 84 faces the water storage tank 7. A recovery filter membrane 85 is installed on the side of the arc-shaped perforated baffle 84 away from the water storage tank 7. The gas passing through the recovery filter membrane 85 is filtered so that only water vapor and ordinary air can pass through, while coffee volatiles cannot pass through.

[0046] After the filtered coffee extract is added into the concentration tank 6 through the coffee feed port 63, the second drive motor 61 and vacuum pump 79 are started. At this time, the valve 9 connecting the bent pipe 73 and the return pipe valve 9 are closed. Vacuum concentration is carried out while stirring. After the vacuum pump 79 draws a vacuum, the pressure in the concentration tank 6 decreases, and the boiling point of water decreases. Since hot water is used to extract coffee from the beginning, the temperature of the coffee extract in the concentration tank 6 is higher than room temperature. After the pressure decreases, the water in the concentration tank 6 boils and evaporates more easily. The evaporated water vapor flows along the vacuum pipe 77 and passes through the recovery filter membrane 85 in the filter recovery tank 8. Because the coffee volatiles that evaporate with the water vapor are larger, they cannot pass through the recovery filter membrane 85. The water vapor will also condense on the recovery filter membrane 85 when it passes through it. The injection process carries the coffee volatiles remaining on the recovery filter membrane 85 downwards and flows into the conical funnel 82. Inside, as the gas passes through the vacuum tube 77 in the cooling cylinder 74, the water vapor gradually condenses on the inner wall of the vacuum tube 77 and flows downward into the storage cylinder 72 due to the circulation of room temperature tap water. Since the lower end of the vacuum tube 77 is inside the storage cylinder 72, as water gradually accumulates in the storage cylinder 72, the gas needs to pass through the water in the storage cylinder 72 to dissolve the remaining coffee volatiles in the water. Finally, the gas is discharged from the suction tube 78 to the vacuum pump 79. When the gas passes through the cooling cylinder 74 in the suction tube 78, the remaining water vapor will condense again and flow downward into the storage cylinder 72, minimizing the content of water vapor and coffee volatiles in the discharged gas. After concentration, the valve 9 connecting the bent pipe 73 is opened to allow the water in the storage cylinder 72 to flow into the water tank 7. The valve 9 of the return pipe is opened to allow the coffee mixture in the conical funnel 82 to flow back into the concentrated coffee liquid, completing the concentration of the coffee extract.

[0047] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A coffee extraction and concentration system, characterized in that: The extraction vessel includes an extraction tank (1), which is supported by a bracket (11). A first drive motor (12) is installed at the upper end of the extraction tank (1). The power output shaft of the first drive motor (12) extends into the extraction tank (1) and is connected to an extraction stirrer (13). The upper end of the extraction tank (1) is provided with a coffee powder feeding port (14), a water feeding port (15), and a pressurizing port (16), all of which are connected to the interior of the extraction vessel. The pressurizing port (16) is connected to an air pressurizing pump (18) through a connecting pipe (115). The coffee powder feeding port (14) is detachably connected to an extraction sealing cap (17). The lower end of the extraction tank (1) is provided with a slag discharge port. The slag discharge port is detachably connected to an internally hollow filter cover (19). The upper end of the filter cover (19) is a filter mesh plate (111). The upper end of the filter mesh plate (111) is provided with a detachable and replaceable primary filter membrane (112). The lower end of the filter cover (19) is connected to an extraction liquid outlet pipe (114) that communicates with its interior. Multiple vertically downward-mounted electric telescopic rods (110) are installed on the outside of the extraction tank (1). The telescopic shaft of each electric telescopic rod (110) is connected to the edge of the filter cover (19). A secondary filter tank (2) is provided with a filter sealing cover (21) detachably connected to the upper end of the secondary filter tank (2). A columnar filter screen (22) extending to its opening is provided at the bottom of the secondary filter tank (2). A removable and replaceable secondary filter membrane (23) is provided on the inner wall of the columnar filter screen (22). The secondary filter tank (2) is connected to a filter outlet pipe (24). The extraction outlet pipe (114) and the filter outlet pipe (24) are respectively connected to the inside or outside of the columnar filter screen (22). A tubular centrifuge (4) is used to centrifuge and filter the filtrate after filtration by the secondary filter tank (2) again. The concentration tank (6) is equipped with a second drive motor (61) at its upper end. The power output shaft of the second drive motor (61) extends into the concentration tank (6) and is connected to a concentration stirrer (62). The upper end of the concentration tank (6) is provided with a coffee liquid inlet (63) and a vacuum port (64) that are both connected to the inside of the tank. The coffee liquid inlet (63) is detachably connected to a concentration sealing cap (65). The lower end of the concentration tank (6) is connected to a discharge pipe (66), and a valve (9) is installed on the discharge pipe (66). A water storage tank (7) has a drain pipe (71) connected to the lower end of the outlet pipe. A valve (9) is installed on the drain pipe (71). A temporary storage cylinder (72) with its bottom not connected to the upper end of the water storage tank (7) is provided. The lower part of the outer side of the temporary storage cylinder (72) is connected to the upper part of the water storage tank (7) through a connecting bend pipe (73). A valve (9) is installed on the connecting bend pipe (73). A cooling cylinder (74) is vertically installed at the upper end of the temporary storage cylinder (72). A water outlet (75) is connected to the upper end of the cooling cylinder (74). The lower end of the cooling cylinder (74) is connected to a water inlet (76). The cooling cylinder (74) is provided with a vacuum tube (77) whose lower end is connected to the interior of the temporary storage cylinder (72). The upper end of the vacuum tube (77) extends out of the cooling cylinder (74), bends towards the concentration tank (6), and connects to the vacuum port (64). The upper end of the temporary storage cylinder (72) is connected upward to a suction tube (78). The free end of the suction tube (78) extends upward out of the cooling cylinder (74) and bends downward to connect to a vacuum pump (79). The vacuum tube (77) is connected to a filter recovery tank (8) in the middle outside the cooling cylinder (74). The filter recovery tank (8) is provided with an arc-shaped mesh partition (84). The arc surface of the arc-shaped mesh partition (84) faces the water storage tank (7). A recovery filter membrane (85) is provided on the side of the arc-shaped mesh partition (84) away from the water storage tank (7). The gas passing through the recovery filter membrane (85) is filtered so that only water vapor and ordinary air can pass through, while the volatiles of coffee cannot pass through. The lower end of the vacuum tube (77) extends into the temporary storage tube (72) and is close to its bottom.

2. The coffee extraction and concentration system according to claim 1, characterized in that: It also includes a first storage tank (3) for temporarily storing the filtrate filtered by the secondary filter tank (2). The upper end of the first storage tank (3) is connected to a first inlet (31) connected to the filtrate outlet pipe (24). The upper end of the first storage tank (3) is connected to a first breather valve (32). The lower end of the first storage tank (3) is connected to a first outlet pipe (33). A valve (9) is installed on the first outlet pipe (33).

3. The coffee extraction and concentration system according to claim 1, characterized in that: It also includes a second storage tank (5) for temporarily storing the filtrate filtered by the tubular centrifuge (4). The upper end of the second storage tank (5) is connected to a second inlet (51) connected to the filtrate outlet pipe (24). The upper end of the second storage tank (5) is connected to a second breather valve (52). The lower end of the second storage tank (5) is connected to a second outlet pipe (53). A valve (9) is installed on the second outlet pipe (53).

4. The coffee extraction and concentration system according to claim 1, characterized in that: The lower end of the filter cover (19) is connected to the extraction liquid pipe (114) by a vertically arranged telescopic tube (113). The telescopic tube (113) includes an outer tube (1131) that is vertically downward from the lower end of the filter cover (19) and an inner sliding tube (1132) that is slidably connected to the inner wall of the outer tube (1131) and communicates with the extraction liquid pipe (114). The lower end of the inner sliding tube (1132) is fixed inside the bracket (11).

5. A coffee extraction and concentration system according to claim 1, characterized in that: The bottom of the filter recovery tank (8) is a mesh perforated water leakage plate (81). A conical funnel (82) is provided at the lower end of the filter recovery tank (8). The lower end of the conical funnel (82) is connected to a recovery pipe (83) that is connected to the upper end of the concentration tank (6). A valve (9) is installed in the middle of the recovery pipe (83).

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