A cold brew coffee making device and process

Abstract

The application discloses a cold extraction coffee preparation device and a preparation process, and particularly relates to the field of coffee preparation. The device comprises a preparation tank, the outer surface of the preparation tank is fixedly connected with a separation time flow pipe, the preparation tank and the separation time flow pipe are in a communication state, the top end of the preparation tank is inserted with a handheld bayonet mount, the bottom end of the preparation tank is fixedly connected with a clamping seat, the bottom end of the clamping seat is fixedly connected with a base frame, a central type rotating rod is synchronously attached to the inner wall of the preparation tank above by a limiting socket frame and a corresponding type buckle rod driving ring-shaped cleaning ring block to perform the same pushing, coffee powder remaining on the inner wall of the preparation tank is pushed down to mix with cold water, then a positioning type clamping rod and a gas bag type resisting block deflect along the inner wall of the preparation tank together with the ring-shaped cleaning ring block and an inner built-in gear frame to stir and mix the coffee powder and the cold water, so that the efficiency of coffee cold extraction is improved, and the coffee powder and the cold water are quickly mixed.

Description

Technical Field

[0001] This invention relates to the field of coffee preparation technology, and more specifically, to a cold brew coffee preparation apparatus and process. Background Technology

[0002] Cold brew coffee is made by pouring cold water into coffee grounds, placing them in a low-temperature environment for about 12 hours, and then filtering out the coffee grounds. It focuses more on the original aroma of the coffee beans. Therefore, the coffee beans need to be in full contact with the cold water to fully release the aroma of the coffee and improve the efficiency of cold brew.

[0003] According to Chinese Patent No. CN219069933U, a pressure pump is used to increase the water pressure to a preset value. By increasing the water pressure, the efficiency of coffee extraction is improved, and the amount of coffee beans consumed when making cold brew coffee is reduced. At the same time, a handheld extractor is used. The bottom of the water inlet chamber is closed, and an array of holes is opened on the side wall. Water flows into the extraction chamber from the side wall that separates the water inlet chamber and the extraction chamber. This increases the contact area between the flowing water and the coffee extract, thereby increasing the efficiency of coffee extraction and reducing the amount of coffee beans consumed when making cold brew coffee.

[0004] However, the above solution improves coffee extraction efficiency by increasing water flow, relying on the user to squeeze the water. However, the upward and downward squeezing of coffee powder and water does not accelerate the combination and extraction of water and coffee. Therefore, we propose a cold brew coffee making device and process. Summary of the Invention

[0005] To overcome the aforementioned deficiencies of the prior art, embodiments of the present invention provide a cold brew coffee making apparatus and process. A central rotating rod, via a limiting insert bracket and a corresponding locking rod, drives an annular cleaning ring block to simultaneously adhere to the upper inner wall of the brewing tank, pushing down residual coffee powder to mix with cold water. Then, a positioning locking rod and an airbag-type resisting block, along with the annular cleaning ring block and the built-in gear frame, deflect along the inner wall of the brewing tank, stirring and mixing the coffee powder and cold water. This improves the efficiency of cold brew coffee, enabling rapid mixing of coffee powder and cold water to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a cold brew coffee making device, comprising a making tank, a separation flow transmission tube fixedly connected to the outer surface of the making tank, the making tank and the separation flow transmission tube being in a communicating state, a handheld bayonet bracket inserted into the top of the making tank, a clamping seat fixedly connected to the bottom of the making tank, and a base frame fixedly connected to the bottom of the clamping seat, the user rotating the handheld bayonet bracket, the handheld bayonet bracket separating from the making tank by means of the threads of the built-in threaded frame, the user putting coffee powder into the inside of the making tank, and then reconnecting the handheld bayonet bracket to the making tank;

[0007] A reversible motor is fixedly connected inside the base frame. A lower partition plate is fixedly connected to the bottom of the preparation tank. A threaded rotating rod is fixedly connected to one end of the reversible motor that passes through the lower partition plate. An upper push plate is threadedly connected to the outer surface of the threaded rotating rod. A gear is fixedly connected to one end of the positioning rotating rod. An internal gear frame is meshed with the outer surface of the gear. A lower extension plate is fixedly connected to one end of the positioning rotating rod. A central rotating rod is fixedly connected to one end of the lower extension plate. A positioning airbag is fixedly connected to one end of the central rotating rod.

[0008] The central rotating rod passes through the positioning airbag and is fixedly connected to a limiting socket bracket. A corresponding latching rod is fixedly connected to the outer surface of the limiting socket bracket. An annular cleaning ring block is fixedly connected to the top of the corresponding latching rod. A positioning holding rod is fixedly connected to the bottom of the annular cleaning ring block. A forward and reverse motor is used as the drive to drive the positioning rotating rod to rotate. The positioning rotating rod drives the central rotating rod to deflect along the rotation direction of the lower extension plate through the lower extension plate. The central rotating rod drives the built-in gear frame to fit along the inner wall of the production tank through the limiting latch. One end of the positioning rotating rod rotates through a gear. The gear meshes with the built-in gear frame and drives the built-in gear frame to rotate synchronously.

[0009] In a preferred embodiment, an airbag-type resisting block is fixedly connected to the outer surface of the positioning airbag, and multiple sets of positioning retaining rods are arranged in a ring about the outer surfaces of the airbag-type resisting block, the annular cleaning ring block, and the built-in gear frame.

[0010] In a preferred embodiment, a limiting buckle is fixedly connected to the outer surface of the central rotating rod. The limiting buckle is fixedly installed at one end of the built-in gear frame. The annular cleaning ring block rotates against the inner wall of the container, which improves the separation efficiency of coffee powder from the inner wall.

[0011] In a preferred embodiment, a slide rail is provided at the connection between the upper push plate and the production tank for the upper push plate to slide. The upper push plate is configured to slide up and down along the slide rail by being guided by the threaded rod.

[0012] In a preferred embodiment, an upper separation port is provided at the connection between the separation transmission pipe and the preparation tank, and a lower separation port is provided below the upper separation port of the separation transmission pipe. An annular partition plate for separating the upper and lower separation ports is fixedly connected between the preparation tank and the separation transmission pipe. When the positioning rotating rod rotates, the positioning rotating rod is transmitted through the thread between the threaded rotating rod and the upper push plate. When the positioning rotating rod rotates clockwise with the forward and reverse motor, the upper push plate moves upward along the surface of the threaded rotating rod. The upper push plate adheres to the inner wall of the preparation tank and pushes the mixture upward. The mixture is transmitted through the lower separation port.

[0013] In a preferred embodiment, the airbag-type resisting block has multiple sets of pushing inclined plates fixedly connected inside, and positioning rubber balls are fixedly connected between the multiple sets of pushing inclined plates. One end of the positioning rubber ball passes through the positioning airbag and is fixedly connected to a sliding pushing rod. One end of the sliding pushing rod is fixedly connected to a limiting air plate. The positioning airbag has a positioning cavity inside. When the overturned coffee liquid comes into contact with the airbag-type resisting block, the airbag-type resisting block is squeezed by the positioning rubber ball. The positioning rubber ball expands due to the rubber material, and the expansion of the positioning rubber ball is transmitted to the inner wall of the airbag-type resisting block through the multiple sets of pushing inclined plates for buffering.

[0014] A process for producing cold brew coffee includes the following steps:

[0015] Step 1: Take medium or light roast coffee beans, grind and sift them to obtain coffee powder with a particle size of 400-600μm. Inoculate lactic acid bacteria into sterilized whey and ferment in a sealed container at 33°C-37°C for 8-12 hours.

[0016] Step 2: Sterilize to obtain cold brew extract. Sterilization is performed using pasteurization. Place coffee powder in the extraction container. The user rotates the handheld bayonet, which separates from the extraction container using the threads of the built-in threaded bracket. The user puts coffee powder into the extraction container and then reconnects the handheld bayonet to the extraction container.

[0017] Step 3: The forward and reverse motor drives the positioning rotating rod to rotate. The positioning rotating rod drives the central rotating rod to deflect along the rotation direction of the lower extension plate through the lower extension plate. The gear meshes with the built-in gear frame, causing the built-in gear frame to rotate synchronously, which pushes the lower part of the inner wall of the production tank, pushing down the coffee powder remaining on the lower part of the inner wall of the production tank to mix with the cold water. At the same time, the central rotating rod drives the annular cleaning ring block to synchronously adhere to the upper part of the inner wall of the production tank through the limit socket bracket and the corresponding buckle rod, pushing down the coffee powder remaining on the upper part of the inner wall of the production tank to mix with the cold water. Then, the positioning clamping rod and the airbag-type resisting block deflect along the inner wall of the production tank with the annular cleaning ring block and the built-in gear frame, stirring and mixing the coffee powder and cold water.

[0018] Step 4: When the positioning rotating rod rotates, the positioning rotating rod is transmitted through the thread between the threaded rotating rod and the upper push plate. When the positioning rotating rod rotates clockwise with the forward and reverse motor, the upper push plate moves upward along the surface of the threaded rotating rod. The upper push plate adheres to the inner wall of the extraction tank and pushes the mixture upward. The mixture is transmitted through the lower separation port. As the mixture continues to rise, the mixture from the lower separation port into the separation transmission tube is transmitted to the upper separation port and reintroduced into the interior of the extraction tank, completing the inversion of the mixture. Finally, the cold brew extract is maintained at 4°C-6°C and extracted with coffee powder for 10-12 hours to obtain milk-containing cold brew coffee.

[0019] The technical effects and advantages of this invention are as follows:

[0020] The gear meshes with the built-in gear frame, causing it to rotate synchronously. This pushes the lower part of the inner wall of the brewing tank, displacing residual coffee powder and mixing it with cold water. Simultaneously, the central rotating rod, through the limiting insert bracket and corresponding locking rod, drives the annular cleaning ring block to simultaneously adhere to the upper part of the inner wall of the brewing tank, pushing down the residual coffee powder and mixing it with cold water. Then, the positioning locking rod and the airbag-type resisting block deflect along the inner wall of the brewing tank with the annular cleaning ring block and the built-in gear frame, stirring and mixing the coffee powder and cold water. This improves the efficiency of cold brewing coffee and allows the coffee powder and cold water to mix quickly.

[0021] When the positioning rotating rod rotates, the positioning rotating rod transmits power through the thread between the threaded rotating rod and the upper push plate. When the positioning rotating rod rotates clockwise with the forward and reverse motor, the upper push plate moves upward along the surface of the threaded rotating rod. The upper push plate adheres to the inner wall of the preparation tank and pushes the mixture upward. The mixture is conducted through the lower separation port. As the mixture continues to rise, the mixture from the lower separation port into the separation transmission pipe is returned to the upper separation port and then into the interior of the preparation tank, thus completing the tumbling of the mixture and causing the water flow to be in a dynamic state, making full contact with the coffee powder.

[0022] The positioning rubber ball expands due to its rubber material, and this expansion is transmitted to the inner wall of the airbag-type resisting block through multiple sets of pushing inclined plates for cushioning. At the same time, the sliding push rod slides through the positioning cavity, compressing the air inside the positioning airbag. The limiting air plate limits the pushing distance of the sliding push rod, and the positioning airbag expands under pressure. After the mixture is flipped, the positioning airbag returns to its original shape, impacting the mixture and causing it to be squeezed again, preventing the mixture from solidifying and affecting the taste of cold brew coffee. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the preparation tank of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of the limiting socket bracket of the present invention.

[0025] Figure 3 This is a schematic diagram of the central rotating rod of the present invention.

[0026] Figure 4 For the present invention Figure 3 Enlarged view of the structure of part A.

[0027] Figure 5 For the present invention Figure 3 Enlarged view of the structure of part B.

[0028] Figure 6 This is a schematic diagram of the corresponding buckle rod of the present invention.

[0029] Figure 7 This is a schematic diagram of the positioning airbag of the present invention.

[0030] The attached diagram is labeled as follows: 1. Production tank; 2. Separation flow tube; 3. Handheld bayonet frame; 4. Clamping seat; 5. Base frame; 6. Internal threaded frame; 7. Central rotating rod; 8. Limiting insertion frame; 9. Corresponding buckle rod; 10. Annular cleaning ring block; 11. Positioning clamping rod; 12. Airbag-type resisting block; 13. Forward and reverse motor; 14. Upper separation port; 15. Lower separation port; 16. Annular partition plate; 17. Lower partition plate; 18. Positioning rotating rod; 19. Threaded rotating rod; 20. Upper pushing plate; 21. Gear; 22. Positioning airbag; 23. Internal gear frame; 24. Lower extension plate; 25. Limiting buckle; 26. Positioning inner cavity; 27. Positioning rubber ball; 28. Pushing tilting plate; 29. ​​Sliding pushing rod; 30. Limiting air plate. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Refer to the instruction manual appendix Figure 1-4 A cold brew coffee making device according to an embodiment of the present invention includes a making tank 1, a separation flow tube 2 fixedly connected to the outer surface of the making tank 1, the making tank 1 and the separation flow tube 2 being in a connected state, a handheld bayonet 3 inserted into the top of the making tank 1, a clamping seat 4 fixedly connected to the bottom of the making tank 1, and a base frame 5 fixedly connected to the bottom of the clamping seat 4. The user rotates the handheld bayonet 3, and the handheld bayonet 3 separates from the making tank 1 by means of the threads of the built-in threaded frame 6. The user puts coffee powder into the inside of the making tank 1, and then connects the handheld bayonet 3 back to the making tank 1.

[0033] A reversible motor 13 is fixedly connected inside the base frame 5. A lower partition plate 17 is fixedly connected to the bottom of the preparation tank 1. A threaded rotating rod 19 is fixedly connected to one end of the reversible motor 13 that passes through the lower partition plate 17. An upper push plate 20 is threadedly connected to the outer surface of the threaded rotating rod 19. A gear 21 is fixedly connected to one end of the positioning rotating rod 18. An internal gear frame 23 is meshed with the outer surface of the gear 21. A lower extension plate 24 is fixedly connected to one end of the positioning rotating rod 18. A central rotating rod 7 is fixedly connected to one end of the lower extension plate 24. A positioning airbag 22 is fixedly connected to one end of the central rotating rod 7.

[0034] Furthermore, a limiting socket bracket 8 is fixedly connected to one end of the central rotating rod 7 that passes through the positioning airbag 22. A corresponding latching rod 9 is fixedly connected to the outer surface of the limiting socket bracket 8. An annular cleaning ring block 10 is fixedly connected to the top of the corresponding latching rod 9. A positioning holding rod 11 is fixedly connected to the bottom of the annular cleaning ring block 10. An airbag-type resisting block 12 is fixedly connected to the outer surface of the positioning airbag 22. Multiple sets of positioning holding rods 11 are arranged in annular shape around the outer surfaces of the airbag-type resisting block 12, the annular cleaning ring block 10, and the built-in gear frame 23. The forward and reverse motor 13 serves as the drive, driving the positioning rotating rod 18 to rotate. The positioning rotating rod 18 drives the central rotating rod 7 to deflect along the rotation direction of the lower extension plate 24 through the lower extension plate 24. The central rotating rod 7 drives the built-in gear frame 23 to fit along the inner wall of the production tank 1 through the limiting latch 25. One end of the positioning rotating rod 18 rotates via the gear 21. The gear 21 meshes with the built-in gear frame 23, causing the built-in gear frame 23 to rotate synchronously. This positions the rotation track of the built-in gear frame 23, pushing the lower part of the inner wall of the brewing tank 1 down to mix with cold water. At the same time, the central rotating rod 7, through the limiting insert bracket 8 and the corresponding latching rod 9, drives the annular cleaning ring block 10 to simultaneously adhere to the upper part of the inner wall of the brewing tank 1, pushing down the coffee powder remaining on the upper part of the inner wall of the brewing tank 1 to mix with cold water. Simultaneously, the positioning holding rod 11 and the airbag-type resisting block 12 deflect along the inner wall of the brewing tank 1 with the annular cleaning ring block 10 and the built-in gear frame 23, stirring and mixing the coffee powder and cold water, thereby improving the efficiency of cold brewing and allowing the coffee powder and cold water to mix quickly.

[0035] Refer to the instruction manual appendix Figure 1-7 The outer surface of the central rotating rod 7 is fixedly connected to a limiting buckle 25. The limiting buckle 25 is fixedly installed at one end of the built-in gear frame 23. The annular cleaning ring block 10 rotates against the inner wall of the preparation tank 1, which improves the separation efficiency of coffee powder from the inner wall. The upper push plate 20 is provided with a slide rail for sliding at the connection between it and the preparation tank 1. The upper push plate 20 is set up to slide up and down along the slide rail by the threaded guide between it and the threaded rotating rod 19.

[0036] Furthermore, an upper separation port 14 is provided at the connection between the separation transmission pipe 2 and the preparation tank 1, and a lower separation port 15 is provided below the upper separation port 14 in the separation transmission pipe 2. An annular partition plate 16 for separating the upper separation port 14 and the lower separation port 15 is fixedly connected between the preparation tank 1 and the separation transmission pipe 2. When the positioning rotating rod 18 rotates, the positioning rotating rod 18 is transmitted through the thread between the threaded rotating rod 19 and the upper push plate 20. When the positioning rotating rod 18 rotates clockwise with the forward and reverse motor 13, the upper push plate 20 moves upward along the surface of the threaded rotating rod 19. The upper push plate 20 adheres to the inner wall of the preparation tank 1 and pushes the mixture upward. The mixture is transmitted through the lower separation port 15. As the mixture continues to rise, the mixture in the separation transmission pipe 2 is introduced from the lower separation port 15 to the upper separation port 14 and then reintroduced into the preparation tank 1, thereby completing the flipping of the mixture and causing the water flow to be in an active state, fully contacting the coffee powder.

[0037] Refer to the instruction manual appendix Figure 2-5 The airbag-type blocking block 12 has multiple sets of pushing inclined plates 28 fixedly connected inside. Positioning rubber balls 27 are fixedly connected between the multiple sets of pushing inclined plates 28. A sliding pushing rod 29 is fixedly connected to one end of the positioning rubber ball 27, which passes through the positioning airbag 22. A limiting air plate 30 is fixedly connected to one end of the sliding pushing rod 29. A positioning cavity 26 is opened inside the positioning airbag 22. When the inverted coffee liquid comes into contact with the airbag-type blocking block 12, the airbag-type blocking block 12 is squeezed by the positioning rubber balls 27. The positioning rubber balls 27, due to the rubber... The material expands, and the expansion of the positioning rubber ball 27 is transmitted to the inner wall of the airbag-type resist block 12 through multiple sets of pushing inclined plates 28 for cushioning. At the same time, the sliding push rod 29 slides through the positioning inner cavity 26 to squeeze the air inside the positioning airbag 22. The limiting air plate 30 limits the pushing distance of the sliding push rod 29, and the positioning airbag 22 expands under pressure. After the mixture is flipped, the positioning airbag 22 returns to its original shape, impacts the mixture, and causes the mixture to be squeezed again to prevent the mixture from solidifying and affecting the taste of cold brew coffee.

[0038] A process for producing cold brew coffee includes the following steps:

[0039] Step 1: Take medium or light roast coffee beans, grind and sift them to obtain coffee powder with a particle size of 400-600μm. Inoculate lactic acid bacteria into sterilized whey and ferment in a sealed container at 33°C-37°C for 8-12 hours.

[0040] Step 2: Sterilize to obtain cold brew extract. Sterilization is performed using pasteurization. Place coffee powder in the extraction container 1. The user rotates the handheld bayonet 3. The handheld bayonet 3 separates from the extraction container 1 using the threads of the built-in threaded bracket 6. The user puts coffee powder into the inside of the extraction container 1 and then reconnects the handheld bayonet 3 to the extraction container 1.

[0041] Step 3: The forward and reverse motor 13 drives the positioning rotating rod 18 to rotate. The positioning rotating rod 18 drives the central rotating rod 7 to deflect along the rotation direction of the lower extension plate 24 through the lower extension plate 24. The gear 21 meshes with the built-in gear frame 23 and drives the built-in gear frame 23 to rotate synchronously, causing the lower part of the inner wall of the production tank 1 to be pushed down and mixed with cold water. At the same time, the central rotating rod 7 drives the annular cleaning ring block 10 to be synchronously attached to the upper part of the inner wall of the production tank 1 through the limiting insertion frame 8 and the corresponding buckle rod 9 to push down and mix with cold water. Then, the positioning clamping rod 11 and the airbag resisting block 12 deflect along the inner wall of the production tank 1 with the annular cleaning ring block 10 and the built-in gear frame 23 to stir and mix the coffee powder and cold water.

[0042] Step 4: When the positioning rotating rod 18 rotates, the positioning rotating rod 18 is transmitted through the thread between the threaded rotating rod 19 and the upper push plate 20. When the positioning rotating rod 18 rotates clockwise with the forward and reverse motor 13, the upper push plate 20 moves upward along the surface of the threaded rotating rod 19. The upper push plate 20 adheres to the inner wall of the preparation tank 1 and pushes the mixture upward. The mixture is transmitted through the lower separation port 15. As the mixture continues to rise, the mixture in the separation transmission pipe 2 is introduced from the lower separation port 15 to the upper separation port 14 and reintroduced into the interior of the preparation tank 1, completing the inversion of the mixture. Finally, the cold brew extract is kept at 4°C-6°C and extracted with coffee powder for 10-12 hours to obtain milk-containing cold brew coffee.

[0043] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0044] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0045] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cold brew coffee making apparatus, comprising a brewing tank (1), characterized in that: The outer surface of the preparation tank (1) is fixedly connected to the separation transmission pipe (2), the preparation tank (1) and the separation transmission pipe (2) are connected in a communication state, a hand-held bayonet frame (3) is inserted into the top of the preparation tank (1), a clamping seat (4) is fixedly connected to the bottom of the preparation tank (1), and a base frame (5) is fixedly connected to the bottom of the clamping seat (4). A reversible motor (13) is fixedly connected inside the base frame (5). A lower partition plate (17) is fixedly connected to the bottom of the preparation tank (1). A threaded rotating rod (19) is fixedly connected to one end of the reversible motor (13) that passes through the lower partition plate (17). An upper push plate (20) is threadedly connected to the outer surface of the threaded rotating rod (19). A positioning rotating rod (18) is fixedly connected to the top of the reversible motor (13). A gear (21) is fixedly connected to one end of the positioning rotating rod (18). An internal gear frame (23) is meshed with the outer surface of the gear (21). A lower extension plate (24) is fixedly connected to one end of the positioning rotating rod (18). A central rotating rod (7) is fixedly connected to one end of the lower extension plate (24). A positioning airbag (22) is fixedly connected to one end of the central rotating rod (7). The central rotating rod (7) passes through the positioning airbag (22) and is fixedly connected to a limiting socket frame (8). A corresponding buckle rod (9) is fixedly connected to the outer surface of the limiting socket frame (8). An annular cleaning ring block (10) is fixedly connected to the top of the corresponding buckle rod (9). A positioning clamping rod (11) is fixedly connected to the bottom of the annular cleaning ring block (10). The annular cleaning ring block (10) rotates against the inner wall of the production tank (1) with the built-in gear frame (23). The outer surface of the positioning airbag (22) is fixedly connected to an airbag-type resisting block (12), and multiple sets of positioning clamping rods (11) are arranged in a ring shape about the outer surface of the airbag-type resisting block (12), the annular cleaning ring block (10) and the built-in gear frame (23). The airbag-type resisting block (12) is internally fixedly connected to multiple sets of pushing tilting plates (28), and positioning rubber balls (27) are fixedly connected between the multiple sets of pushing tilting plates (28). The positioning rubber ball (27) passes through the positioning airbag (22) and is fixedly connected to a sliding push rod (29). One end of the sliding push rod (29) is fixedly connected to a limiting air plate (30). The positioning airbag (22) is internally provided with a positioning cavity (26).

2. The cold brew coffee making apparatus according to claim 1, characterized in that: The outer surface of the central rotating rod (7) is fixedly connected to a limiting buckle (25), which is fixedly installed at one end of the built-in gear frame (23).

3. The cold brew coffee making apparatus according to claim 2, characterized in that: The upper push plate (20) is provided with a slide rail for sliding at the connection between the upper push plate (20) and the preparation tank (1). The upper push plate (20) is set up to slide up and down along the slide rail by being guided by the threaded rotating rod (19).

4. The cold brew coffee making apparatus according to claim 3, characterized in that: An upper separation port (14) is provided at the connection between the separation transmission pipe (2) and the preparation tank (1). A lower separation port (15) is provided below the upper separation port (14) of the separation transmission pipe (2). An annular partition plate (16) for separating the upper separation port (14) and the lower separation port (15) is fixedly connected between the preparation tank (1) and the separation transmission pipe (2).

5. A process for producing cold brew coffee, using the cold brew coffee producing apparatus as described in claim 4, characterized in that, Includes the following steps: Step 1: Take medium or light roast coffee beans, grind and sift them to obtain coffee powder with a particle size of 400-600μm. Inoculate lactic acid bacteria into sterilized whey and ferment in a sealed container at 33°C-37°C for 8-12 hours. Step 2: Sterilize to obtain cold brew extract. Sterilization is performed by pasteurization. Place coffee powder in the extraction container (1). The user rotates the handheld bayonet (3). The handheld bayonet (3) is separated from the extraction container (1) by the threads of the built-in threaded frame (6). The user puts coffee powder into the inside of the extraction container (1) and then connects the handheld bayonet (3) to the extraction container (1). Step 3: The forward and reverse motor (13) drives the positioning rotating rod (18) to rotate. The positioning rotating rod (18) drives the central rotating rod (7) to deflect along the rotation direction of the lower extension plate (24) through the lower extension plate (24). The gear (21) meshes with the built-in gear frame (23) to drive the built-in gear frame (23) to rotate synchronously, pushing down the coffee powder remaining on the lower part of the inner wall of the preparation tank (1) to mix with cold water. At the same time, the central rotating rod (7) The limiting socket bracket (8) and the corresponding buckle rod (9) drive the annular cleaning ring block (10) to simultaneously adhere to the inner wall of the preparation tank (1) and push it down to mix with cold water. Then, the positioning clamping rod (11) and the airbag resisting block (12) deflect along the inner wall of the preparation tank (1) with the annular cleaning ring block (10) and the built-in gear frame (23) to stir and mix the coffee powder and cold water. Step 4: When the positioning rotating rod (18) rotates, the positioning rotating rod (18) is transmitted through the thread between the threaded rotating rod (19) and the upper push plate (20). When the positioning rotating rod (18) rotates clockwise with the forward and reverse motor (13), the upper push plate (20) moves upward along the surface of the threaded rotating rod (19). The upper push plate (20) adheres to the inner wall of the preparation tank (1) and pushes the mixture upward. The mixture is transmitted through the lower separation port (15). As the mixture continues to rise, the mixture in the separation transmission pipe (2) from the lower separation port (15) is transmitted to the upper separation port (14) and then re-enters the interior of the preparation tank (1), completing the flipping of the mixture. Finally, the cold brew extract at 4°C-6°C is extracted with coffee powder for 10-12 hours to obtain milk-containing cold brew coffee.

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