Nitrogen ice drop compound cold extraction coffee liquid and processing technology and matched device thereof

Abstract

The invention discloses nitrogen and ice drop compounded cold extraction coffee liquid and a processing technology and a matched device thereof, and belongs to the technical field of coffee preparation, the nitrogen and ice drop compounded cold extraction coffee liquid comprises a bottom plate and an extraction assembly, a supporting rod is installed on the bottom plate, a first supporting plate, a second supporting plate and a third supporting plate are installed on the supporting rod, a driving device is movably installed on the first supporting plate, and the driving device is movably installed on the second supporting plate. The upper end of the extraction assembly is arranged on the third supporting plate, the middle of the extraction assembly is arranged on the driving device, and the lower end of the extraction assembly is arranged on the bottom plate; the drop distance of the discharge pipe can be dynamically adjusted and fixed according to the extraction process, so that the problems of early-stage excessive extraction and later-stage insufficient extraction in the coffee extraction process are solved; nitrogen is injected into the coffee powder cup at the later stage of extraction to form micro-bubbles to permeate the coffee powder layer, so that the extraction effect is enhanced, and full dissolution of traditional Chinese medicine components is facilitated; the mounting table can drive the coffee powder cup to rotate, multi-area uniform infiltration of a powder layer can be achieved, and the extracted flavor and taste are improved.

Description

Technical Field

[0001] This invention belongs to the field of coffee preparation technology, and particularly relates to a nitrogen-infused ice-drop cold brew coffee liquid, its processing technology, and supporting equipment. Background Technology

[0002] Cold brew coffee is essentially a process that uses a solvent to extract the soluble flavor compounds from coffee. Cold drip extraction, on the other hand, uses melting ice to extract coffee drop by drop, minimizing the evaporation of flavors at low temperatures and preserving as much of the coffee aroma as possible in the liquid. Coffee extracted through cold drip has a rich, smooth, and full-bodied taste that is gentle on the stomach and not acidic. If beneficial herbal powders are added to coffee powder before extraction, the combination can provide the body with pharmacological effects and a unique coffee aroma. Existing cold brew coffee devices are generally divided into two categories: traditional cold brew devices and intelligent cold brew devices.

[0003] Traditional cold brew devices are generally used in homes, employing fixed drip cold brew systems. Gravity forces cold water from the water reservoir into the coffee grounds at a fixed rate. The distance between the dripper and the coffee grounds is fixed, typically 5-10cm, and cannot be adjusted. This allows for stratified contact between water and coffee, reducing grounds buildup. However, its drawbacks are also obvious: the fixed drip distance cannot adapt to the dynamic changes in the extraction process. In the early stages of extraction, when the coffee grounds have a high content of soluble substances, a closer drip distance leads to prolonged contact between the water droplets and the grounds, causing excessive extraction of these substances and resulting in "over-extraction," which can make the coffee taste astringent. In the later stages of extraction, when the content of soluble substances decreases, a longer drip distance causes the water droplets to quickly wash over the surface of the grounds, preventing penetration to deeper layers and resulting in "under-extraction," which can lead to flavor gaps and a thin, bland taste.

[0004] Intelligent cold brew devices are generally commercial applications. They have higher requirements for cold brew quality and efficiency, and can precisely control the extraction temperature, drip rate and total extraction time. Some even support remote start-up. However, they do not make any adjustments to the drip distance, so they cannot change the contact time and wetting depth between the water droplet and the coffee grounds. Even if the drip rate is slowed down, if the drip distance is fixed too far, the water droplet will still pass through the surface of the coffee grounds quickly and cannot fully wet the deep coffee grounds, resulting in insufficient extraction.

[0005] Furthermore, different roast levels and different bean varieties have different cold brew requirements, but existing devices can only be adjusted through "time / temperature control" and cannot optimize flavor release through drip distance. This results in poor adaptability of the device to different coffee beans and makes it difficult to achieve customized flavor.

[0006] In existing technologies, nitrogen is injected into cold-brewed coffee to create nitrogen coffee, which is extremely low in calories and contains no added sugar or alcohol. Nitrogen bubbles create a spectacular waterfall effect in cold coffee, forming a rich, creamy foam layer. This method involves directly injecting nitrogen into the extracted coffee, which only improves the taste of the coffee. However, if nitrogen is injected into the coffee grounds later in the extraction process, the extraction effect can be enhanced through the physical penetration of high-pressure nitrogen microbubbles, especially for the full dissolution of Chinese herbal ingredients.

[0007] Therefore, a cold extraction device is proposed that can dynamically adjust the drop distance during the extraction process, and can also enhance the extraction effect by using high-pressure nitrogen microbubbles in the later stage of extraction, so as to fully dissolve the Chinese herbal medicine components. Summary of the Invention

[0008] In view of the above situation and to overcome the defects of the prior art, the present invention provides a nitrogen-infused ice drop cold brew coffee liquid, its processing technology and supporting equipment, which at least partially solves the above technical problems.

[0009] The technical solution adopted in this invention is as follows: This invention proposes a processing method for nitrogen-infused cold brew coffee liquid, comprising the following steps:

[0010] Step 1: Raw material pretreatment

[0011] Longan pulp: Select sulfur-free dried longan, slice it into 2-3mm thin slices, soak it in 60℃ warm water for 15 minutes to remove surface impurities and soften it, drain it, and grind it simultaneously with coffee beans; Goji berries: Select plump berries, rinse them quickly with sterile RO water to remove dust, dry them at low temperature (40℃ / 2h), and then grind them to 80-100 mesh; Dandelion root: Slice it and roast it at low temperature (105℃ / 10min) to enhance its aroma, and grind it to a fineness of 500-600μm (matching the particle size of coffee powder); Dried tangerine peel: Take dried mature peel Soak in food-grade ethanol (50% by volume) for 30 minutes to remove bitterness, air dry, and then pulverize to 80-100 mesh; Ginseng: after slicing, extract under ultra-high pressure and low temperature (300MPa / 4℃ / 10min) to retain saponin activity, filter and collect the clear liquid for later use; Coffee bean selection: grind size: 600-800μm (pass through a 20-mesh sieve, retaining 12% coarse particles); water quality control: RO water (TDS≤30ppm, pH6.8-7.2), sterilized with ozone and stored aseptically; water-to-coffee ratio: 1:8-1:10;

[0012] Coffee powder is mixed evenly with dried longan pulp, goji berries, dandelion root, and dried tangerine peel powder using a three-dimensional mixer (20 rpm / 15 min). The mixed coffee powder is then cooled and stored at the same temperature as the ice drip extraction temperature.

[0013] Step 2: Ice droplet-nitrogen synergistic extraction

[0014] Extraction was carried out using an extraction device. Before the ice drop stage, the ginseng extract was mixed with 0°C cold water at a ratio of 1:5. Then, ice cubes were mixed with the 0°C cold water and placed in the extraction device for drip filtration at a flow rate of 1.5 drops / second for 6 hours. The flow rate was then adjusted to 1 drop / second for 2 hours to ensure that the Chinese herbal components were fully dissolved.

[0015] During the later stages of extraction (the last 2 hours), food-grade nitrogen is injected into the coffee powder cup at a pressure of 0.3-0.6 MPa through the gas delivery tube, forming microbubbles that permeate the coffee powder layer.

[0016] During the extraction process, the extraction device can drive the mounting platform to rotate slowly, adjust the position of the coffee powder drip, and adjust the drip distance according to the extraction time; the temperature throughout the process is ≤8℃.

[0017] Step 3: Nitrogen gas for freshness preservation and sterilization

[0018] Nitrogen purging: After extraction, nitrogen gas is purged into a closed system to a gauge pressure of 0.2-0.25 MPa and maintained for 10 min, with residual oxygen content ≤0.2%;

[0019] Sterilization combination: first pasteurize (60℃ / 20min), then treat with ultra-high pressure (HPP600MPa / 100s), balancing the sterilization effect and the activity of functional components through short-time high pressure;

[0020] Step 4: Filling

[0021] Inert environment filling: Aluminum foil composite bags (oxygen permeability ≤ 0.5cc / m³) 2 • Day) or brown glass bottle (light-shielding rate ≥99%);

[0022] Nitrogen filling and sealing: residual oxygen content inside the packaging ≤0.1%, headspace volume inside the packaging ≤5%, sealing temperature 120±5℃.

[0023] The extraction device in step two includes a base plate and an extraction assembly. A support rod for fixing is installed on the base plate. Support plate one, support plate two and support plate three are installed on the support rod from bottom to top. A driving device is movably installed on support plate one. The upper end of the extraction assembly is located on support plate three. The middle part of the extraction assembly is located on the driving device. The lower end of the extraction assembly is located on the base plate.

[0024] The driving device includes a driving component, an adjusting component, a fixing component, and a lifting component. The driving component is movably mounted on a support plate. The adjusting component and the fixing component are both mounted on the driving component. The lifting component is located at the upper end of the adjusting component.

[0025] The drive assembly includes a mounting platform, a rotating wheel, a drive gear, and a driven gear. The mounting platform is movably engaged with the upper wall of a support plate, and the rotating wheel is movably engaged with the mounting platform. The upper end of the rotating wheel has an annular upper gear tooth, and the side wall of the rotating wheel has an annular side gear tooth. The drive gear and the driven gear are both movably mounted on the support plate. The drive gear meshes with the driven gear, and the driven gear meshes with the side gear tooth.

[0026] The adjustment assembly comprises four sets, which are evenly spaced in a ring on the upper wall of the mounting platform. Each set of adjustment assemblies includes a fixed base, a driven gear two, a connecting rod, a drive rod one, and a drive rod two. The fixed base is located on the upper wall of the mounting platform, and the connecting rod movably passes through the fixed base. The driven gear two is mounted on one end of the connecting rod and meshes with the upper gear. One end of the drive rod one is located on the other end of the connecting rod, and the drive rod one and the connecting rod are fixedly connected. One end of the drive rod two is movably connected to the other end of the drive rod one, and the lifting component is movably mounted on the other end of the drive rod two.

[0027] The fixing assembly includes a mounting frame, a hydraulic rod, a push plate, and a plug rod. The mounting frame is mounted on the upper wall of the mounting platform, the hydraulic rod is mounted on the mounting frame and the mounting frame supports the hydraulic rod, the push plate is located at the movable end of the hydraulic rod, the plug rod is located on the bottom wall of the push plate, and the upper wall of the rotating wheel has a plug hole that penetrates the upper wall of the mounting platform. The plug hole is located at the lower end of the plug rod, and the plug rod can be movably engaged in the plug hole.

[0028] The extraction assembly includes a container bottle, a coffee powder cup, a filter, and a coffee liquid container. The upper end of the container bottle is mounted on a support plate three, which supports and fixes the container bottle. The upper end of the container bottle is equipped with a cap, and the lower end is equipped with a discharge pipe. The discharge pipe is movably installed through the support plate two. A water droplet adjustment valve is installed on the discharge pipe located at the lower end of the support plate two. An ice-water mixture is placed inside the container bottle. The water droplet adjustment valve can adjust the water droplet speed. The cap is equipped with a valve to balance the pressure inside and outside the container bottle, facilitating the dripping of the ice-water mixture.

[0029] The coffee powder cup is movably placed inside the lifting component. A first shielding cover is movably placed on the upper end of the coffee powder cup, and the diameter of the first shielding cover is larger than the diameter of the upper end of the coffee powder cup. The lower end of the discharge pipe movably passes through the first shielding cover and is located inside the coffee powder cup, which contains the coffee powder mixture to be extracted. The filter element is located on a support plate. A second shielding cover is movably placed on the upper end of the filter element, and the diameter of the second shielding cover is larger than the diameter of the upper end of the filter element. The lifting component has a through hole in the center. The lower end of the coffee powder cup movably passes through the through hole and the second shielding cover and is located inside the filter element. The coffee liquid container is placed on the base plate, and the lower end of the filter element is movably located in the coffee liquid container.

[0030] Furthermore, the drive assembly also includes a mounting base, which is located on a base plate. A motor is mounted on the mounting base, and the output shaft of the motor is connected to the center of the drive gear. The motor is equipped with a corresponding reduction transmission mechanism to achieve low-frequency speed. The motor drives the drive gear to rotate.

[0031] A liquid nitrogen storage tank is placed between the base plate and the support plate. The liquid nitrogen storage tank contains food-grade nitrogen. A gas delivery pipe is installed on the nitrogen storage tank. A flow-limiting valve is installed on the gas delivery pipe to control the amount of nitrogen discharged. The discharge end of the gas delivery pipe passes through the cover and is placed inside the coffee powder cup, and the discharge end of the gas delivery pipe is placed close to the coffee powder mixture.

[0032] This invention also proposes a nitrogen-infused cold brew coffee liquid, which is prepared by the aforementioned processing technology and includes the following ingredients in the following weight ratio: 100g coffee beans, 8-12g dried longan pulp, 5-8g goji berries, 3-5g dandelion, 2-3g dried tangerine peel, and 4-6g ginseng.

[0033] The coffee beans are medium-dark roasted Arabica beans (SCAA roast level 60-70), and are used within 15-30 days after roasting to avoid oil oxidation. The coffee beans undergo 24-hour anaerobic fermentation, and 2% papain is added during the fermentation process to enhance the sweetness tolerance.

[0034] The beneficial effects of the present invention after adopting the above structure are as follows:

[0035] (1) When the rotating wheel rotates only, the rotating wheel drives the upper gear under the drive of the driven gear one, the upper gear drives the driven gear two that meshes with it to move, and the driven gear two drives the adjustment component to move, so that the discharge pipe can dynamically adjust the drip distance according to the extraction process. In the early stage of extraction, the content of soluble substances in coffee powder is high. The drip distance is adjusted appropriately to make the drip distance longer, reduce the contact time between water droplets and the powder layer, and slowly extract soluble substances, thus overcoming the problem of over-extraction in the early stage, which makes the coffee easy to have a bitter taste. In the middle and late stages of extraction, the content of soluble substances decreases. The drip distance is adjusted appropriately to make the drip distance shorter, reduce the speed at which water droplets wash the surface of the powder layer, and allow water droplets to penetrate to the deep layer, thus overcoming the problem of insufficient extraction in the later stage, which makes the coffee easy to have a flavor gap and a thin taste.

[0036] (2) During the later stage of extraction (the last 2 hours), food-grade nitrogen gas is injected into the coffee powder cup through the gas supply pipe at a pressure of 0.3-0.6MPa to form microbubbles that penetrate the coffee powder layer, enhance the extraction effect, and make it more conducive to the full dissolution of Chinese medicine components.

[0037] (3) After the drip distance is adjusted, the entire extraction process requires the rotating wheel and the mounting platform to rotate together. The insertion rod is inserted into the insertion hole. Under the drive of the driven gear, the rotating wheel drives the mounting platform to move together, which can drive the coffee powder cup to rotate, allowing the water flow to evenly cover the entire powder layer, achieving uniform wetting of multiple areas of the powder layer, and improving the extraction flavor and taste. Attached Figure Description

[0038] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0039] Figure 1 This is a schematic diagram of the supporting device for nitrogen ice drop compounding cold brew coffee liquid proposed in this invention;

[0040] Figure 2 for Figure 1 A magnified view of a portion at point A;

[0041] Figure 3 This is a schematic diagram of the extraction component proposed in this invention;

[0042] Figure 4 This is a schematic diagram of the drive device proposed in this invention.

[0043] Figure 5 for Figure 4 A magnified view of a portion at point B;

[0044] Figure 6 This is a cross-sectional view of a device for preparing nitrogen-infused cold brew coffee liquid according to the present invention.

[0045] In the attached diagram: 1. Base plate; 2. Extraction assembly; 3. Support rod; 4. Support plate one; 5. Support plate two; 6. Support plate three; 7. Drive assembly; 8. Adjustment assembly; 9. Fixing assembly; 10. Lifting component; 11. Mounting platform; 12. Rotating wheel; 13. Drive gear; 14. Driven gear one; 15. Upper gear tooth; 16. Side gear tooth; 17. Fixed base; 18. Driven gear two; 19. Connecting rod; 20. 21. Drive rod 1, 22. Drive rod 2, 23. Mounting bracket, 24. Hydraulic rod, 25. Push plate, 26. Insert rod, 27. Insertion hole, 28. Container bottle, 29. Coffee powder cup, 30. Filter element, 31. Coffee liquid container, 32. Cap, 33. Discharge pipe, 34. Water drop adjustment valve, 35. Mounting base, 36. Motor, 37. Liquid nitrogen storage tank, 38. Gas supply pipe, 39. Shielding cover 1, 30. Shielding cover 2. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] This invention proposes a processing method for nitrogen-infused cold brew coffee liquid, comprising the following steps:

[0049] Step 1: Raw material pretreatment

[0050] Longan pulp: Select sulfur-free dried longan, slice it into 2-3mm thin slices, soak it in 60℃ warm water for 15 minutes to remove surface impurities and soften it, drain it, and grind it simultaneously with coffee beans; Goji berries: Select plump berries, rinse them quickly with sterile RO water to remove dust, dry them at a low temperature of 40℃ for 2 hours, and then grind them to 80-100 mesh; Dandelion root: After slicing, roast it at a low temperature of 105℃ for 10 minutes to enhance its aroma, and control the grind size to 500-600μm to match the particle size of the coffee powder; Dried tangerine peel: Take the dried mature peel. Soak in food-grade ethanol (50% by volume) for 30 minutes to remove bitterness, air dry, and then pulverize to 80-100 mesh; Ginseng: after slicing, extract under ultra-high pressure and low temperature (300MPa / 4℃ / 10min) to retain saponin activity, filter and collect the clear liquid for later use; Coffee bean selection: grind size: 600-800μm (pass through a 20-mesh sieve, retaining 12% coarse particles); water quality control: RO water (TDS≤30ppm, pH6.8-7.2), sterilized with ozone and stored aseptically; water-to-coffee ratio: 1:9;

[0051] Coffee powder is mixed evenly with longan pulp, goji berries, dandelion root, and dried tangerine peel powder using a three-dimensional mixer (20 rpm / 15 min). The coffee powder is then cooled and stored at the same temperature as the ice drip extraction temperature.

[0052] Step 2: Ice droplet-nitrogen synergistic extraction

[0053] Extraction is carried out using an extraction device. The mixed and cooled coffee powder is spread evenly in the extraction device. Ginseng extract is mixed with 0°C cold water at a ratio of 1:5 before the ice drip stage. Then, ice cubes are mixed with the 0°C cold water and placed in the extraction device for drip filtration at a flow rate of 1.5 drops / second for 6 hours. The flow rate is then adjusted to 1 drop / second for 2 hours to ensure that the Chinese herbal ingredients are fully dissolved.

[0054] During the later stages of extraction (the last 2 hours), food-grade nitrogen is injected into the coffee powder cup 28 through the gas supply pipe 37 at a pressure of 0.3-0.6 MPa, forming microbubbles that penetrate the coffee powder layer.

[0055] During the extraction process, the extraction device can drive the mounting platform 11 to rotate slowly, adjust the position of the coffee powder drip, and adjust the drip distance according to the extraction time; the temperature throughout the process is ≤8℃.

[0056] Step 3: Nitrogen gas for freshness preservation and sterilization

[0057] Nitrogen purging: After extraction, nitrogen gas is purged into a closed system to a gauge pressure of 0.2-0.25 MPa and maintained for 10 min, with residual oxygen content ≤0.2%;

[0058] Sterilization combination: first pasteurize (60℃ / 20min), then treat with ultra-high pressure (HPP600MPa / 100s), balancing the sterilization effect and the activity of functional components through short-time high pressure;

[0059] Step 4: Filling

[0060] Inert environment filling: Aluminum foil composite bags (oxygen permeability ≤ 0.5cc / m³) 2 • Day) or brown glass bottle (light-shielding rate ≥99%);

[0061] Nitrogen filling and sealing: residual oxygen content inside the packaging ≤0.1%, headspace volume inside the packaging ≤5%, sealing temperature 120±5℃.

[0062] like Figures 1-6 As shown, the extraction device in step two includes a base plate 1 and an extraction component 2. A support rod 3 for fixing is installed on the base plate 1. From bottom to top, the support rod 3 is equipped with a support plate 4, a support plate 5, and a support plate 6. A driving device is movably installed on the support plate 4. The upper end of the extraction component 2 is located on the support plate 6, the middle part of the extraction component 2 is located on the driving device, and the lower end of the extraction component 2 is located on the base plate 1.

[0063] The driving device includes a driving component 7, an adjusting component 8, a fixing component 9, and a lifting component 10. The driving component 7 is movably mounted on the support plate 4. The adjusting component 8 and the fixing component 9 are both mounted on the driving component 7. The lifting component 10 is located at the upper end of the adjusting component 8.

[0064] The drive assembly 7 includes a mounting platform 11, a rotating wheel 12, a drive gear 13, and a driven gear 14. The mounting platform 11 is movably engaged with the upper wall of the support plate 4. The rotating wheel 12 is movably engaged with the mounting platform 11. The upper end of the rotating wheel 12 is provided with an upper gear tooth 15 in an annular shape, and the side wall of the rotating wheel 12 is provided with a side gear tooth 16 in an annular shape. The drive gear 13 and the driven gear 14 are both movably mounted on the support plate 4. The drive gear 13 is meshed with the driven gear 14, and the driven gear 14 is meshed with the side gear tooth 16.

[0065] It should be noted that the rotation of the driving gear 13 drives the rotation of the driven gear 14, which in turn drives the rotating wheel 12 to rotate via the side gear 16. The rotating wheel 12 then drives the upper gear 15 to rotate.

[0066] The adjustment assembly 8 is provided in four groups, which are evenly arranged in a ring on the upper wall of the mounting platform 11. Each group of adjustment assemblies 8 includes a fixed seat 17, a driven gear 18, a connecting rod 19, a drive rod 20, and a drive rod 21. The fixed seat 17 is provided on the upper wall of the mounting platform 11. The connecting rod 19 is movably disposed through the fixed seat 17. The driven gear 18 is installed on one end of the connecting rod 19 and meshes with the upper gear 15. One end of the drive rod 20 is provided on the other end of the connecting rod 19. The drive rod 20 and the connecting rod 19 are fixedly connected. One end of the drive rod 21 is movably connected to the other end of the drive rod 20. The lifting member 10 is movably installed on the other end of the drive rod 21.

[0067] It should be noted that when the upper gear 15 rotates, it can drive the driven gear 18 meshing with it to rotate. The driven gear 18 drives the connecting rod 19 to rotate. The connecting rod 19 drives the drive rod 20 to make a circular motion around the connecting rod 19 as the center of rotation. The drive rod 20 drives the drive rod 21 to move. When the angle between the drive rod 21 and the drive rod 20 increases, the lifting member 10 rises. When the angle between the drive rod 21 and the drive rod 20 decreases, the lifting member 10 descends.

[0068] The fixing component 9 includes a mounting frame 22, a hydraulic rod 23, a push plate 24, and a plug rod 25. The mounting frame 22 is mounted on the upper wall of the mounting platform 11, the hydraulic rod 23 is mounted on the mounting frame 22, and the mounting frame 22 supports the hydraulic rod 23. The push plate 24 is located at the movable end of the hydraulic rod 23, and the plug rod 25 is located on the bottom wall of the push plate 24. The upper wall of the rotating wheel 12 is provided with a plug hole 26, which penetrates the upper wall of the mounting platform 11 and is located at the lower end of the plug rod 25. The plug rod 25 can be movably engaged in the plug hole 26.

[0069] It should be noted that if only the rotating wheel 12 needs to rotate, the insertion rod 25 is not inserted into the insertion hole 26. Under the drive of the driven gear 14, the rotating wheel 12 drives the upper gear 15 to move, and the upper gear 15 drives the driven gear 18 that meshes with it to move. If the rotating wheel 12 and the mounting platform 11 need to rotate together, the insertion rod 25 is inserted into the insertion hole 26. Under the drive of the driven gear 14, the rotating wheel 12 drives the mounting platform 11 to move together.

[0070] The extraction assembly 2 includes a container 27, a coffee powder cup 28, a filter 29, and a coffee liquid container 30. The upper end of the container 27 is mounted on a support plate 36, which supports and fixes the container 27. The upper end of the container 27 is provided with a cap 31, and the lower end is provided with a discharge pipe 32. The discharge pipe 32 is movably installed through the support plate 25. A water droplet adjustment valve 33 is installed on the discharge pipe 32 located at the lower end of the support plate 25. An ice-water mixture is placed inside the container 27. The water droplet adjustment valve 33 can adjust the water droplet speed. The cap 31 is provided with a valve to balance the pressure inside and outside the container 27, facilitating the dripping of the ice-water mixture. The coffee powder cup 28 is movably placed inside the lifting component 10. A shielding cover 38 is movably placed on the upper end of the coffee powder cup 28. The diameter of the shielding cover 38 is larger than the diameter of the upper end of the coffee powder cup 28. The lower end of the discharge pipe 32 movably passes through the shielding cover 38 and is located inside the coffee powder cup 28. The coffee powder cup 28 contains a mixture of coffee powder to be extracted. The filter element 29 is located on the support plate 4. A shielding cover 39 is movably placed on the upper end of the filter element 29. The diameter of the shielding cover 39 is larger than the diameter of the upper end of the filter element 29. The lifting member 10 has a through hole in the center. The lower end of the coffee powder cup 28 movably passes through the through hole and the shielding cover 39 and is located inside the filter element 29. The coffee liquid container 30 is placed on the base plate 1. The lower end of the filter element 29 is movably located in the coffee liquid container 30.

[0071] The drive assembly 7 also includes a mounting base 34, which is located on the base plate 1. A motor 35 is mounted on the mounting base 34. The output shaft of the motor 35 is connected to the center of the drive gear 13. The motor 35 is equipped with a corresponding reduction transmission mechanism to achieve low frequency speed. The operation of the motor 35 drives the drive gear 13 to rotate.

[0072] A liquid nitrogen storage tank 36 is placed between the base plate 1 and the support plate 4. Food-grade nitrogen is placed inside the liquid nitrogen storage tank 36. A gas supply pipe 37 is installed on the nitrogen storage tank. A flow limiting valve is installed on the gas supply pipe 37 to control the amount of nitrogen discharged. The discharge end of the gas supply pipe 37 passes through the cover 38 and is placed inside the coffee powder cup 28. The discharge end of the gas supply pipe 37 is placed close to the coffee powder mixture.

[0073] The specific usage of the nitrogen-based ice drip cold brew coffee blending device is as follows:

[0074] First, install the container 27 on the support plate 36. Spread the mixed and cooled coffee powder evenly in the coffee powder cup 28. Then place the coffee powder cup 28 on the lifting member 10. The discharge pipe 32 at the lower end of the container 27 is located inside the coffee powder cup 28. Then assemble the filter element 29. The lower end of the coffee powder cup 28 is located inside the filter element 29. Place the coffee liquid container 30 on the base plate 1. The lower end of the filter element 29 is located inside the coffee liquid container 30.

[0075] The drive unit adjusts the height of the lifting component 10 to adjust the drip distance of the coffee powder in the coffee powder cup 28 to the lower end of the discharge pipe 32, as follows:

[0076] At this time, only the rotating wheel 12 needs to rotate, and the insertion rod 25 is not inserted into the insertion hole 26. The motor 35 works, driving the drive gear 13 to rotate. The drive gear 13 drives the driven gear 14 that meshes with it to rotate. The driven gear 14 drives the rotating wheel 12 to rotate. The rotating wheel 12 drives the upper gear 15 to move. The upper gear 15 drives the driven gear 18 that meshes with it to move. The driven gear 18 drives the connecting rod 19 to rotate. The connecting rod 19 drives the drive rod 20 to make a circular motion around the connecting rod 19 as the center of rotation. The drive rod 20 drives the drive rod 21 to move. When the angle between the drive rod 21 and the drive rod 20 increases, the lifting member 10 rises. When the angle between the drive rod 21 and the drive rod 20 decreases, the lifting member 10 descends.

[0077] After adjusting the drip distance, mix ginseng extract with 0℃ cold water at a ratio of 1:5. Then, mix ice cubes with the 0℃ cold water mixture and place it in container 27 for drip filtration at a flow rate of 1.5 drops / second for 6 hours. Adjust the flow rate to 1 drop / second for 2 hours to ensure full dissolution of the Chinese herbal ingredients. In the later stage of extraction (the last 2 hours), inject food-grade nitrogen gas into coffee powder cup 28 through gas delivery tube 37 at a pressure of 0.3-0.6MPa to form microbubbles that permeate the coffee powder layer.

[0078] Throughout the extraction process, the drive unit slowly rotates the mounting platform 11 to adjust the position of the coffee powder drip, as follows:

[0079] When the hydraulic rod 23 operates, it drives the push plate 24 to move downward, and the push plate 24 drives the insertion rod 25 to insert into the insertion hole 26.

[0080] The motor 35 drives the drive gear 13 to rotate, which in turn drives the driven gear 14 to rotate. The driven gear 14 drives the rotating wheel 12 and the mounting platform 11 to move together. The mounting platform 11 drives the lifting member 10 on it to rotate, which in turn drives the coffee powder cup 28 to rotate. During the rotation, the position of the coffee powder cup 28 is pushed every hour to adjust the position of the water droplets.

[0081] Meanwhile, adjust the drop distance according to the extraction time, as described above.

[0082] The present invention also proposes a nitrogen-infused cold brew coffee liquid, wherein the coffee liquid is prepared by the aforementioned processing technology and comprises the following ingredients in the following weight ratio: 100g coffee beans, 10g dried longan pulp, 6g goji berries, 4g dandelion, 3g dried tangerine peel, and 5g ginseng.

[0083] The coffee beans are medium-dark roasted Arabica beans (SCAA roast level 60-70), and are used within 15-30 days after roasting to avoid oil oxidation. The coffee beans undergo 24-hour anaerobic fermentation, and 2% papain is added during the fermentation process to enhance the sweetness tolerance.

[0084] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents. In conclusion, if those skilled in the art, inspired by this description, design similar structural methods and embodiments without departing from the inventive spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A processing method for nitrogen-infused cold brew coffee liquid, characterized in that: Includes the following steps: Step 1: Raw material pretreatment Longan pulp: Cut into 2-3mm thin slices, soak in 60℃ warm water for 15 minutes to remove surface impurities and soften, drain and grind together with coffee beans; Goji berries: Rinse them quickly to remove dust, dry them at low temperature, and then grind them to 80-100 mesh; Dandelion roots: Slice them and bake them at low temperature, with the grinding degree controlled at 500-600μm; Dried tangerine peel: Take dried, mature peel, soak it in food-grade ethanol for 30 minutes to remove bitterness, air dry it, and then pulverize it to 80-100 mesh; Ginseng: After slicing, extract it under ultra-high pressure and low temperature to retain the activity of saponins, filter it and take the clear liquid for later use. Coffee beans: grind size 600-800μm; water quality control: RO water, aseptically stored after ozone sterilization; water-to-coffee ratio: 1:8-1:10; Coffee powder is mixed evenly with longan pulp, goji berries, dandelion root, and dried tangerine peel powder using a three-dimensional mixer. The mixed coffee powder is then cooled and stored at the same temperature as the ice drip extraction temperature. Step 2: Ice droplet-nitrogen synergistic extraction Extraction is carried out using an extraction device. The mixed and cooled coffee powder is spread evenly in the extraction device. Ginseng extract is mixed with 0°C cold water at a ratio of 1:5 before the ice drip stage. Then, ice cubes are mixed with the 0°C cold water and placed in the extraction device for drip filtration at a flow rate of 1.5 drops / second for 6 hours. The flow rate is then adjusted to 1 drop / second for 2 hours to ensure that the Chinese herbal ingredients are fully dissolved. During the later stages of extraction (the last 2 hours), food-grade nitrogen is injected into the coffee powder cup at a pressure of 0.3-0.6 MPa through the gas delivery tube, forming microbubbles that permeate the coffee powder layer. During the extraction process, the extraction device can drive the mounting platform to rotate slowly, adjust the position of the coffee powder drip, and adjust the drip distance according to the extraction time; the temperature throughout the process is ≤8℃. Step 3: Nitrogen gas for freshness preservation and sterilization Nitrogen purging: After extraction, nitrogen gas is purged into a closed system to a gauge pressure of 0.2-0.25 MPa and maintained for 10 min, with residual oxygen content ≤0.2%; Sterilization combination: first pasteurization, then ultra-high pressure treatment, balancing the sterilization effect and the activity of functional ingredients through short-time high pressure; Step 4: Filling Inert environment filling: aluminum foil composite bags or brown glass bottles; Nitrogen filling and sealing: residual oxygen content inside the packaging ≤0.1%, headspace volume inside the packaging ≤5%, sealing temperature 120±5℃.

2. The processing method for nitrogen-infused cold brew coffee liquid according to claim 1, characterized in that: The extraction device in step two includes a base plate and an extraction assembly. A support rod for fixing is installed on the base plate. Support plate one, support plate two and support plate three are installed on the support rod from bottom to top. A driving device is movably installed on support plate one. The upper end of the extraction assembly is located on support plate three. The middle part of the extraction assembly is located on the driving device. The lower end of the extraction assembly is located on the base plate. The driving device includes a driving component, an adjusting component, a fixing component, and a lifting component. The driving component is movably mounted on a support plate. The adjusting component and the fixing component are both mounted on the driving component. The lifting component is located at the upper end of the adjusting component.

3. The processing method for nitrogen-infused cold brew coffee liquid according to claim 2, characterized in that: The drive assembly includes a mounting platform, a rotating wheel, a drive gear, and a driven gear. The mounting platform is movably engaged with the upper wall of a support plate. The rotating wheel is movably engaged with the mounting platform. The upper end of the rotating wheel has an annular upper gear tooth, and the side wall of the rotating wheel has an annular side gear tooth. The drive gear and the driven gear are both movably mounted on the support plate. The drive gear meshes with the driven gear, and the driven gear meshes with the side gear tooth.

4. The processing method for nitrogen-infused cold brew coffee liquid according to claim 3, characterized in that: The adjustment assembly comprises four sets, which are evenly spaced in a ring on the upper wall of the mounting platform. Each set of the adjustment assembly includes a fixed base, a driven gear two, a connecting rod, a drive rod one, and a drive rod two. The fixed base is located on the upper wall of the mounting platform, and the connecting rod movably passes through the fixed base. The driven gear two is mounted on one end of the connecting rod and meshes with the upper gear. One end of the drive rod one is located on the other end of the connecting rod, and one end of the drive rod two is movably connected to the other end of the drive rod one. The lifting component is movably mounted on the other end of the drive rod two.

5. The processing method for nitrogen-infused cold brew coffee liquid according to claim 4, characterized in that: The fixing assembly includes a mounting bracket, a hydraulic rod, a push plate, and a plug rod. The mounting bracket is mounted on the upper wall of the mounting platform, the hydraulic rod is mounted on the mounting bracket, the push plate is located at the movable end of the hydraulic rod, the plug rod is located on the bottom wall of the push plate, and the upper wall of the rotating wheel has a plug hole that penetrates the upper wall of the mounting platform and is located at the lower end of the plug rod.

6. The processing method for nitrogen-infused cold brew coffee liquid according to claim 5, characterized in that: The extraction assembly includes a container, a coffee powder cup, a filter, and a coffee liquid container. The upper end of the container is mounted on a support plate three. The upper end of the container is provided with a cap, and the lower end is provided with a discharge pipe. The discharge pipe is movably installed through the support plate two. A water droplet adjustment valve is installed on the discharge pipe located at the lower end of the support plate two. The coffee powder cup is movably placed inside the lifting component, and a first shielding cover is movably placed on the upper end of the coffee powder cup. The lower end of the discharge pipe movably passes through the first shielding cover and is located inside the coffee powder cup. The filter element is located on the first support plate, and a second shielding cover is movably placed on the upper end of the filter element. The lifting component has a through hole in the center, and the lower end of the coffee powder cup movably passes through the through hole and the second shielding cover and is located inside the filter element. The coffee liquid container is placed on the base plate, and the lower end of the filter element is movably located in the coffee liquid container.

7. The processing method for nitrogen-infused cold brew coffee liquid according to claim 6, characterized in that: The drive assembly also includes a mounting base, which is disposed on a base plate. A motor is mounted on the mounting base, and the output shaft end of the motor is connected to the center of the drive gear.

8. The processing method for nitrogen-infused cold brew coffee liquid according to claim 7, characterized in that: A liquid nitrogen storage tank is placed between the base plate and the support plate. A gas delivery pipe is installed on the nitrogen storage tank. A flow limiting valve is installed on the gas delivery pipe. The discharge end of the gas delivery pipe passes through the cover and is located inside the coffee powder cup.

9. A nitrogen-infused ice-drip cold brew coffee liquid, characterized in that: The coffee liquid is prepared by the processing technology described in any one of claims 1-8.

10. The nitrogen-infused ice-drop cold brew coffee liquid according to claim 9, characterized in that: The ingredients are in the following weight proportions: 100g coffee beans, 8-12g dried longan pulp, 5-8g goji berries, 3-5g dandelion, 2-3g dried tangerine peel, and 4-6g ginseng.

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