Brewing extraction mechanism and full-automatic coffee machine

Abstract

The utility model relates to the technical field of coffee machines, in particular to a brewing extraction mechanism, a full-automatic coffee machine and a powder receiving assembly, which comprise a powder receiving cylinder and an extraction part connected with the powder receiving cylinder and are used for receiving coffee powder and completing extraction; the driving assembly comprises a stepping motor, a synchronous wheel, a main rotating shaft and a synchronous belt, and the stepping motor drives the main rotating shaft through the synchronous wheel to drive the powder receiving barrel to rotate; rotation of the powder receiving cylinder and powder pressing and discharging strokes of the lead screw are accurately controlled by the synchronous wheel and the synchronous belt through forward and reverse rotation switching of the stepping motor, flexible adjustment can be achieved according to different coffee making requirements, the efficiency and accuracy of the coffee making process are improved, the lead screw can perform one-time or multiple-time reciprocating motion in the powder discharging stage, and the coffee making efficiency is improved. Coffee grounds can be ensured to be completely discharged out of the powder receiving cylinder according to the actual situation, the problems of powder blocking and powder stacking are effectively avoided, the continuous working capacity of the coffee machine is guaranteed, and the maintenance frequency is reduced.

Description

Technical Field

[0001] This utility model relates to the field of coffee machine technology, specifically to a brewing and extraction mechanism and a fully automatic coffee machine. Background Technology

[0002] Currently available fully automatic coffee machines generally suffer from the following technical defects in their extraction and brewing functions:

[0003] Structural complexity and maintenance difficulties: The redundant mechanical linkage design makes component disassembly and assembly cumbersome, resulting in high maintenance costs and low efficiency.

[0004] Insufficient pressure control precision: The lack of a stable pressure regulation mechanism can cause pressure fluctuations during brewing, resulting in uneven gaps between coffee grounds and affecting the consistency of extracted flavor.

[0005] Incomplete removal of coffee grounds: The coffee dispensing mechanism relies on a single movement trajectory, and coffee grounds easily accumulate in the dead corners of the coffee hopper, requiring frequent shutdowns for cleaning and hindering continuous operation of the equipment.

[0006] The aforementioned problems directly lead to a decline in user experience (such as unstable coffee quality) and an increase in equipment maintenance costs (such as an increase in the frequency of manual cleaning). Based on this, this application provides a brewing and extraction mechanism and a fully automatic coffee machine. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a brewing and extraction mechanism and a fully automatic coffee machine, which solves the problems of structural complexity, maintenance difficulties, and inconvenient cleaning in existing technologies.

[0008] The brewing and extraction mechanism of this utility model includes:

[0009] The coffee powder receiving assembly includes a receiving cylinder and an extraction section connected thereto, used to receive coffee powder and complete the extraction;

[0010] The drive assembly includes a stepper motor, a synchronous pulley, a main shaft, and a synchronous belt. The stepper motor drives the main shaft to rotate the powder receiving cylinder via the synchronous pulley.

[0011] The coffee grounds tamping and discharging mechanism includes a lead screw and a nut that cooperates with it. The lead screw is driven by a timing belt and is used to perform tamping action and reciprocating motion to discharge coffee grounds.

[0012] A cam linkage assembly includes a rotating sleeve and a plunger. The rotating sleeve is fixed to the extraction section by a collar. The rotating sleeve cooperates with the plunger to limit the vertical displacement and rotation angle of the rotating sleeve, thereby realizing the lifting and separating of the extraction section.

[0013] The fluid passage includes an inlet and an outlet, used for injecting hot water and discharging coffee liquid, respectively.

[0014] As a further improvement of this utility model, the rotating sleeve includes a curved surface, and a step is provided on one side of the curved surface, the step being adapted to the plunger.

[0015] As a further improvement of this utility model, the stepper motor drives the synchronous pulley to drive the synchronous belt to control the rotation of the powder receiving cylinder and the powder pressing and discharging stroke of the lead screw by switching between forward and reverse rotation.

[0016] As a further improvement of this utility model, the rotating sleeve is limited by a plunger during the screw pressing stage and rotates synchronously with the main rotating shaft;

[0017] During the powder discharge stage, the reverse driving force of the lead screw is used to separate the main rotating shaft from the synchronous operation, thereby controlling the independent lifting and lowering of the extraction section.

[0018] As a further improvement of this utility model, the lead screw performs one or more reciprocating movements during the powder discharge stage to ensure that coffee grounds are discharged from the powder receiving container.

[0019] As a further improvement of this utility model, the lifting stroke of the extraction section is controlled by the curved surface of the bushing, the contour of the step, and the limiting point of the plunger, and is linked to the rotation position of the powder receiving cylinder.

[0020] As a further improvement of this utility model, there are multiple plungers, which are symmetrically distributed on both sides of the curved surface of the rotating sleeve to limit the rotation angle of the rotating sleeve.

[0021] This invention also provides a fully automatic coffee machine equipped with the brewing and extraction mechanism, and further includes an automatic control module to coordinate the operation sequence of the drive components and the fluid passage.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] This invention uses a stepper motor to switch between forward and reverse rotation, and utilizes a synchronous pulley and synchronous belt to precisely control the rotation of the coffee grounds receiving cylinder and the pressing and discharging stroke of the lead screw. It can be flexibly adjusted according to different coffee making needs, improving the efficiency and accuracy of the coffee making process. The lead screw can perform one or more reciprocating motions during the discharging stage, ensuring that the coffee grounds are completely discharged from the receiving cylinder according to the actual situation, effectively avoiding the problems of clogging and piling up of coffee grounds, ensuring the continuous working ability of the coffee machine, and reducing the maintenance frequency. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0025] Figure 1 This is a three-dimensional structural diagram of the powder receiving component and the driving component of this utility model;

[0026] Figure 2 This is a front view schematic diagram of the powder pressing and discharging mechanism, cam linkage assembly, and fluid passage of this utility model;

[0027] Figure 3 This is a front view structural diagram of the cam linkage assembly of this utility model;

[0028] Figure 4 This is a front view of the powder pressing and discharging mechanism and the cam linkage assembly of this utility model from another angle;

[0029] Figure 5 This is a schematic diagram of the three-dimensional structure of the rotating sleeve of this utility model;

[0030] Figure 6 This is a three-dimensional structural diagram of the rotating sleeve of this utility model from another angle;

[0031] Figure 7 This is a top view of the powder receiving component and the driving component of this utility model.

[0032] In the diagram: 1. Powder receiving assembly; 2. Drive assembly; 3. Powder pressing and discharging mechanism; 4. Cam linkage assembly; 5. Fluid passage;

[0033] 101. Powder receiving cylinder; 102. Extraction section;

[0034] 201. Stepper motor; 202. Synchronous pulley; 203. Main shaft; 204. Synchronous belt;

[0035] 301. Lead screw; 302. Nut;

[0036] 401. Rotary sleeve; 402. Plunger;

[0037] 501. Liquid inlet; 502. Liquid outlet;

[0038] 4011. Curved surface; 4012. Step. Detailed Implementation

[0039] The following illustrations will reveal several embodiments of the present invention. For clarity, many physical details will be described in the following description. However, it should be understood that these physical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these physical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in a simple schematic manner in the illustrations.

[0040] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0041] Please see Figure 1-7 Existing fully automatic coffee machines on the market either have complex mechanical structures that are difficult to maintain, or they cannot control the brewing pressure, resulting in a loss of flavor in the coffee. Alternatively, coffee grounds extracted in the fully automatic coffee machine cannot be completely removed, causing clogging and requiring periodic cleaning, preventing the machine from operating for extended periods. Therefore, this application provides a brewing and extraction mechanism, including:

[0042] The coffee powder receiving assembly 1 includes a coffee powder receiving cylinder 101 and an extraction section 102 connected thereto, which is used to receive coffee powder and complete extraction.

[0043] The drive assembly 2 includes a stepper motor 201, a synchronous pulley 202, a main shaft 203, and a synchronous belt 204. The stepper motor 201 drives the main shaft 203 to rotate the powder receiving cylinder 101 through the synchronous pulley 202.

[0044] The coffee grounds tamping and discharging mechanism 3 includes a lead screw 301 and a nut 302 that cooperates with it. The lead screw 301 is driven by a timing belt 204 to perform tamping and reciprocating motion to discharge coffee grounds.

[0045] The cam linkage assembly 4 includes a rotating sleeve 401 and a plunger 402. The rotating sleeve 401 is fixed to the extraction part 102 by a collar. The rotating sleeve 401 and the plunger 402 cooperate to limit the vertical displacement and rotation angle of the rotating sleeve 401, so as to realize the lifting and separation of the extraction part 102.

[0046] The fluid passage 5 includes an inlet 501 and an outlet 502, which are used to inject hot water and discharge coffee liquid, respectively.

[0047] The coffee powder receiving hopper 101 is made of high-quality food-grade stainless steel. Its inner wall is finely polished, resulting in a smooth surface that effectively prevents coffee powder from sticking to the inner wall. The coffee powder receiving hopper 101 is designed in a funnel shape, wider at the top and narrower at the bottom. The large opening at the top facilitates the collection of coffee powder falling from the coffee bean grinder. The bottom is connected to the extraction unit 102 via a detachable threaded connection, allowing for separate cleaning and maintenance of the coffee powder receiving hopper 101 and the extraction unit 102 when needed.

[0048] The extraction unit 102 is equipped with multiple layers of filters. The pore size of the filters can ensure that the hot water can fully contact the coffee powder for extraction, while effectively filtering out coffee grounds, making the extracted coffee liquid purer. The outer side of the extraction unit 102 is wrapped with a layer of heat-insulating material, which can maintain a suitable temperature during the extraction process and improve the coffee extraction effect.

[0049] The drive component uses a high-precision, low-noise stepper motor 201, whose speed and torque can be precisely adjusted according to different coffee making needs. The stepper motor 201 is installed on the base of the coffee machine and connected to the base through a shock-absorbing pad to reduce the vibration and noise generated during motor operation.

[0050] The timing pulley 202 is made of engineering plastic with a special surface treatment, which gives it good wear resistance and corrosion resistance. The timing belt 204 is made of rubber with high-strength steel wires embedded inside, which can ensure that there is no slippage during long-term operation and ensure stable power transmission.

[0051] The main shaft 203 is made of high-quality alloy steel, and its surface is hardened and chrome-plated, giving it high strength and hardness. High-precision bearings are installed at both ends of the main shaft 203 to reduce frictional resistance during rotation and improve rotational stability. The main shaft 203 is connected to the powder receiving cylinder 101 via a key to ensure synchronous rotation.

[0052] The lead screw 301 adopts a threaded design, which has high transmission efficiency and self-locking performance. The nut 302 and the lead screw 301 have extremely high matching precision, which can ensure that the nut 302 can accurately perform linear motion when the lead screw 301 rotates. One end of the lead screw 301 is connected to the synchronous belt 204 through a coupling, and the synchronous belt 204 drives the lead screw 301 to rotate.

[0053] When the receiving cylinder 101 receives an appropriate amount of coffee powder, the stepper motor 201 drives the lead screw 301 to rotate through the synchronous pulley 202 and the synchronous belt 204. The nut 302 moves downward on the lead screw 301 to compact the coffee powder. The compaction force can be precisely adjusted by controlling the speed and torque of the stepper motor 201 to meet the compaction requirements of different types of coffee beans.

[0054] After extraction, the stepper motor 201 reverses, driving the lead screw 301 to rotate in the opposite direction. The nut 302 moves upward on the lead screw 301, while the lead screw 301 performs multiple up-and-down reciprocating movements to completely discharge the coffee grounds from the powder hopper. The discharged coffee grounds fall into the waste collection box through the discharge port at the bottom of the powder receiving hopper 101.

[0055] The rotating sleeve 401 is made of high-strength aluminum alloy and has an anodized surface, giving it excellent wear resistance and corrosion resistance. The outer side of the rotating sleeve 401 is tightly fixed to the extraction section 102 by a collar, ensuring that the two can move synchronously.

[0056] The plunger 402 is mounted on the fixed bracket of the coffee machine and cooperates with the rotating sleeve 401. The head of the plunger 402 adopts a special curved surface design, which can precisely fit with the inner wall of the rotating sleeve 401, limiting the vertical displacement and rotation angle of the rotating sleeve 401. When the rotating sleeve 401 rotates with the powder receiving canister 101, the plunger 402, through its cooperation with the rotating sleeve 401, causes the extraction section 102 to achieve a lifting and separating action. During the extraction process, the extraction section 102 descends and fits tightly with the powder receiving canister 101, forming a closed extraction space; after extraction, the extraction section 102 rises and separates from the powder receiving canister 101, making it easy to discharge coffee grounds.

[0057] The inlet 501 connects to a hot water supply device, which can be a built-in heating tank or an external hot water pipe. A flow regulating valve and a temperature sensor are installed at the inlet 501 to precisely control the flow rate and temperature of the injected hot water to meet the needs of different coffee preparation methods.

[0058] The outlet 502 is connected to the coffee cup placement area. A guide plate is installed below the outlet 502 to guide the coffee liquid evenly into the coffee cup. A filter screen is also installed at the outlet 502 to further filter out any coffee grounds that may remain.

[0059] By incorporating a cam mechanism with limit switches, and combining the synchronous pulley 202, synchronous belt 204, and lead screw 301 and nut 302, the mechanical structure of the entire brewing and extraction mechanism is simplified and made clearer. The connections between the various components are clearly defined, allowing maintenance personnel to quickly locate problems during troubleshooting and repair, thus reducing maintenance difficulty and costs.

[0060] The drive assembly 2 controls the rotation speed and angle of the coffee powder receiving cylinder 101, ensuring that the coffee powder is evenly contacted with hot water during the extraction process. Simultaneously, the tamping and discharging mechanism 3 precisely controls the tamping force, ensuring uniform coffee powder density and thus guaranteeing stable brewing pressure. This helps to fully extract the flavor compounds of the coffee, improving its taste and quality.

[0061] The repeated up-and-down reciprocating motion of the lead screw 301 in the tamping and discharging mechanism 3 completely removes coffee grounds from the powder compartment, preventing accumulation and clogging. This allows the coffee machine to operate continuously for extended periods, reducing the frequency of cleaning and maintenance, and improving work efficiency, making it particularly suitable for commercial applications.

[0062] The rotating sleeve 401 includes a curved surface 4011, and a step 4012 is provided on one side of the curved surface 4011. The step 4012 is adapted to the plunger 402.

[0063] The stepper motor 201 drives the synchronous pulley 202 to drive the synchronous belt 204 through forward and reverse switching, respectively controlling the rotation of the powder receiving cylinder 101 and the powder pressing and discharging stroke of the lead screw 301.

[0064] During the powder pressing stage of the screw 301, the rotating sleeve 401 is limited by the plunger 402 and rotates synchronously with the main rotating shaft 203.

[0065] During the powder discharge stage, the reverse driving force of the lead screw 301 is used to separate the main rotating shaft 203 from the synchronous operation, which is used to control the independent lifting and lowering of the extraction section 102.

[0066] The lead screw 301 performs one or more reciprocating movements during the powder discharge stage to ensure that coffee grounds are discharged from the powder receiving container 101.

[0067] The lifting stroke of the extraction section 102 is controlled by the contours of the curved surface 4011 and the step 4012 of the bushing and the limiting point of the plunger 402, and is linked to the rotation position of the powder receiving cylinder 101.

[0068] There are multiple plungers 402, which are symmetrically distributed on both sides of the curved surface 4011 of the rotating sleeve 401, and are used to limit the rotation angle of the rotating sleeve 401.

[0069] The rotating sleeve 401 is made of aluminum alloy, and its curved surface 4011 is CNC machined, resulting in a smooth surface and extremely high curve precision. A step 4012 on one side of the curved surface 4011 perfectly matches the size of the plunger 402 head. The plunger 402 is made of stainless steel, and its head is ground and polished to ensure smooth and tight contact with the step 4012. In actual installation, multiple plungers 402 are symmetrically distributed on both sides of the curved surface 4011 of the rotating sleeve 401. For example, four plungers 402 are arranged in pairs, evenly distributed at different positions around the circumference of the rotating sleeve 401. This more effectively limits the rotation angle of the rotating sleeve 401.

[0070] The stepper motor 201 is installed in a dedicated motor compartment inside the coffee machine's base. The motor compartment is equipped with shock-absorbing pads to reduce vibration and noise generated during motor operation. The forward and reverse rotation of the stepper motor 201 is precisely controlled by the coffee machine's central control system. This control system can accurately adjust the rotation direction and speed of the stepper motor 201 according to a preset coffee brewing program. When the coffee powder container 101 needs to rotate, the control system sends a command to the stepper motor 201 to rotate forward. This drives the synchronous belt 204 via the synchronous pulley 202, causing the main shaft 203 to rotate, which in turn drives the coffee powder container 101 to rotate, evenly distributing the coffee powder within it. When tamping or discharging is required, the control system controls the stepper motor 201 to rotate in reverse. The synchronous belt 204 drives the lead screw 301 to move, achieving the tamping or discharging actions.

[0071] When the screw 301 performs the tamping action, the step 4012 on the rotating sleeve 401 engages tightly with the plunger 402, which acts as a limit, ensuring that the rotating sleeve 401 rotates synchronously with the main shaft 203. At this time, the rotational power of the main shaft 203 is transmitted to the extraction section 102 through the rotating sleeve 401, causing the extraction section 102 to rotate together with the coffee receiving cylinder 101. This ensures that the coffee powder is evenly distributed in the coffee receiving cylinder 101 and the extraction section 102 during the tamping process, preparing for the subsequent extraction process.

[0072] When the coffee grounds removal stage begins, the lead screw 301 rotates in the opposite direction, generating a reverse driving force that causes the rotating sleeve 401 to disengage from the main shaft 203. The rotating sleeve 401 then begins to move independently. Since the rotating sleeve 401 is fixedly connected to the extraction unit 102 via a collar, the movement of the rotating sleeve 401 causes the extraction unit 102 to rise and fall independently. For example, at the start of the coffee grounds removal stage, the rotating sleeve 401 causes the extraction unit 102 to rise and separate from the coffee grounds receiving container 101, facilitating the removal of coffee grounds.

[0073] The number of reciprocating motions of the lead screw 301 during the coffee grounds discharge stage can be adjusted according to the amount and accumulation of coffee grounds. When the coffee production volume is small and the amount of coffee grounds is small, one reciprocating motion of the lead screw 301 is enough to discharge the coffee grounds from the coffee grounds container 101. However, when the coffee production volume is large and the amount of coffee grounds is large, the control system will control the lead screw 301 to perform multiple reciprocating motions to ensure that the coffee grounds are completely discharged. Each time it rises, it pushes the coffee grounds upwards, and when it falls, it prepares for the next discharge. Through multiple such actions, the coffee grounds in the coffee grounds container are thoroughly removed.

[0074] The lifting and lowering stroke of the extraction section 102 is precisely controlled by the contours of the curved surface of the bushing 4011 and the step 4012, as well as the limiting point of the plunger 402. The curve design of the curved surface of the bushing 4011 is optimized according to the optimal extraction and sediment removal requirements for coffee making, and the height and position of the step 4012 determine the magnitude of the rise and fall of the extraction section 102. At the same time, the limiting point of the plunger 402 ensures that the lifting and lowering action of the extraction section 102 is precisely linked to the rotation position of the receiving cylinder 101 during the rotation of the rotating sleeve 401. For example, when the receiving cylinder 101 rotates to a specific position, the limiting effect of the plunger 402 on the rotating sleeve 401 causes the extraction section 102 to begin to descend, closely fitting with the receiving cylinder 101 to begin extraction; after extraction is completed, the receiving cylinder 101 continues to rotate to another specific position, and the plunger 402 again plays its role, causing the extraction section 102 to rise and separate from the receiving cylinder 101 for sediment removal.

[0075] The stepper motor 201 precisely controls the rotation of the coffee powder receiving cylinder 101 and the tamping and discharging stroke of the lead screw 301 by switching between forward and reverse rotation. It can flexibly adjust its actions according to different coffee making needs, ensuring the accuracy and efficiency of the coffee making process. For example, when making different types of coffee, the rotation speed of the coffee powder receiving cylinder 101 and the tamping force of the lead screw 301 can be precisely controlled according to the requirements for coffee powder distribution and compaction.

[0076] The lead screw 301 can perform one or more reciprocating movements during the coffee grounds discharge stage, ensuring that coffee grounds are completely discharged from the coffee grounds collection container 101 according to actual conditions, effectively avoiding problems such as clogging and piling up of coffee grounds. This not only improves the continuous working capacity of the coffee machine and reduces the frequency of manual cleaning, but also ensures the hygiene and quality of coffee making.

[0077] The rotating sleeve 401 is designed with reasonable movement states at different stages. During the tamping stage, it rotates synchronously with the main rotating shaft 203 to ensure even distribution of coffee powder. During the powder discharge stage, the lifting and lowering of the extraction section 102 is independently controlled to facilitate the discharge of grounds. At the same time, the lifting stroke of the extraction section 102 is linked to the rotation position of the powder receiving cylinder 101, making the entire extraction process more stable and reliable, fully extracting the flavor of the coffee, and improving the taste and quality of the coffee.

[0078] The curved surface 4011 and step 4012 of the rotating sleeve 401 cooperate with multiple symmetrically distributed plungers 402 to precisely limit the rotation angle of the rotating sleeve 401, ensuring the accuracy and stability of the movement of each component. This scientific and reasonable structural design makes the mechanical structure of the coffee machine more compact, reduces the probability of malfunctions, and extends the service life of the coffee machine.

[0079] Traditional cam mechanisms typically employ a single curved surface (such as a cylindrical cam or a disc cam), enabling only single-degree-of-freedom motion. In contrast, a hyperboloid is integrated into the outer wall of the rotating sleeve 401 (401), achieving the following through different surface segments: the first surface engages with the plunger 402 to control the lifting stroke of the extraction section 102 (102); the second surface engages with the symmetrical plunger 402 to limit the rotation angle of the rotating sleeve 401. This single component achieves coordinated control of two degrees of freedom, eliminating the need for auxiliary mechanisms.

[0080] Example 2:

[0081] A fully automatic coffee machine equipped with a brewing and extraction mechanism is characterized in that it further includes an automatic control module to coordinate the operation sequence of the drive component 2 and the fluid passage 5.

[0082] The automatic control module, based on a microprocessor and corresponding control software, connects and interacts with various key components of the drive component 2 and the fluid passage 5.

[0083] According to the preset coffee making program, the automatic control module precisely controls the forward and reverse rotation, speed, and torque of the stepper motor 201. For example, in the coffee grounds receiving stage, the stepper motor 201 is controlled to rotate forward, so that the coffee grounds receiving cylinder 101 rotates at an appropriate speed to ensure that the coffee grounds are evenly distributed; in the tamping stage, the reverse rotation parameter of the stepper motor 201 is adjusted to control the lead screw 301 to tamp the coffee grounds with appropriate force; in the coffee grounds discharge stage, the stepper motor 201 is controlled to rotate in reverse again and its running time is adjusted so that the lead screw 301 completes multiple reciprocating motions to completely discharge the coffee grounds.

[0084] The automatic control module communicates with the flow regulating valve and temperature sensor of the inlet 501 to precisely control the injection flow and temperature of hot water according to the brewing requirements of different coffees. For example, when making espresso, the inlet 501 is controlled to quickly inject high-temperature hot water to complete the extraction in a short time; when making Americano, the hot water temperature is appropriately reduced and the injection time is increased.

[0085] The automatic control module ensures that the actions of the drive component 2 and the fluid passage 5 are performed in a specific sequence and time interval. For example, after the coffee powder is evenly distributed by the rotating powder receiving hopper 101, the automatic control module issues a command to the screw 301 to tamp the powder. After tamping, the module controls the liquid inlet 501 to inject hot water for extraction. After extraction, the module controls the screw 301 to discharge the powder. The entire process is seamlessly connected, achieving efficient and precise coffee making.

[0086] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A brewing extraction mechanism, characterized in that, The utility model relates to a coffee machine, comprising: a powder receiving assembly (1) comprising a powder receiving cylinder (101) and an extraction unit (102) connected thereto, for receiving coffee powder and completing extraction; a driving assembly (2) comprising a stepper motor (201), a synchronous wheel (202), a main rotating shaft (203) and a synchronous belt (204), the stepper motor (201) driving the main rotating shaft (203) through the synchronous wheel (202) to drive the powder receiving cylinder (101) to rotate; a powder pressing and discharging mechanism (3) comprising a screw rod (301) and a nut (302) cooperating therewith, the screw rod (301) being driven by the synchronous belt (204) to perform a powder pressing action and reciprocating motion to discharge coffee residue; a cam linkage assembly (4) comprising a rotating sleeve (401) and a plunger (402), the rotating sleeve (401) being fixed to the extraction unit (102) through a sleeve ring, the rotating sleeve (401) cooperating with the plunger (402) to limit the vertical displacement and rotation angle of the rotating sleeve (401), so as to realize the lifting and separation of the extraction unit (102); a fluid passage (5) comprising an inlet (501) and an outlet (502) for injecting hot water and discharging coffee liquid, respectively.

2. The brewing extraction mechanism of claim 1, wherein: The rotating sleeve (401) comprises a curved surface portion (4011), one side of the curved surface portion (4011) being provided with a step (4012) adapted to the plunger (402).

3. The brewing extraction mechanism of claim 1, wherein: The stepper motor (201) drives the synchronous wheel (202) to drive the synchronous belt (204) to control the rotation of the powder receiving cylinder (101) and the powder pressing and discharging stroke of the screw rod (301) respectively through forward and reverse rotation switching.

4. The brew extraction mechanism of claim 1, wherein: The rotating sleeve (401) is limited by the plunger (402) during the powder pressing stage of the screw rod (301) and rotates synchronously with the main rotating shaft (203). During the powder discharging stage, the screw rod (301) is driven in reverse to disengage from the main rotating shaft (203) for controlling the independent lifting of the extraction unit (102).

5. The brew extraction mechanism of claim 1, wherein: The screw rod (301) performs one or more reciprocating motions during the powder discharging stage to ensure that the coffee residue is discharged from the powder receiving cylinder (101).

6. The brew extraction mechanism of claim 1, wherein: The lifting stroke of the extraction unit (102) is controlled by the profile of the curved surface portion (4011) and the step (4012) of the shaft sleeve and the limiting point of the plunger (402), and is linked with the rotation position of the powder receiving cylinder (101).

7. The brew extraction mechanism of claim 1, wherein: The plunger (402) is provided in multiple numbers and symmetrically distributed on both sides of the curved surface portion (4011) of the rotating sleeve (401) for limiting the rotation angle of the rotating sleeve (401).

8. A fully automatic coffee machine configured with a brewing and extraction mechanism as claimed in any one of claims 1-7, characterized in that: An automatic control module is further included to coordinate the operation timing of the driving assembly and the fluid passage.

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