Coffee machine and powder pressing device

Abstract

The invention discloses a coffee machine and a powder pressing device, which are applied to the technical field of coffee machines. The pressing hammer assembly is installed on the support and moves in a reciprocating mode along the axis to compact powder; the funnel assembly comprises a funnel and a funnel bracket, and the funnel comprises a powder cavity for containing the powder and a connecting lug; the funnel bracket is provided with a first connecting table; the weighing assembly comprises a weighing device and a scale frame for installing the weighing device, and the scale frame is provided with a second connecting table; before powder pressing, the connecting lug is in lap joint with the second connecting table, during powder pressing, the pressing hammer assembly moves in the powder pressing direction to drive the funnel bracket and the scale frame to move relatively, the first connecting table is in lap joint with the connecting lug, and the connecting lug is separated from the second connecting table. Coffee powder is weighed during powder pressing, and weighing and powder pressing are completed at a time.

Description

Technical Field

[0001] This invention relates to the field of coffee machine technology, and in particular to a coffee machine and a tamping device. Background Technology

[0002] In the coffee-making process, a fixed amount of coffee grounds is typically weighed first, then tamped, and finally the coffee puck is extracted. Currently, most coffee grounds are weighed and tamped manually. An external electronic scale is used to weigh the coffee grounds, and then an external hand tamper is used to tamp them. The problem is that if the coffee grounds are not heavy enough, they need to be ground again. This grinding and weighing process is repeated before tamping, making the process cumbersome.

[0003] In conclusion, how to effectively solve the problems of cumbersome powder pressing and weighing operations is an urgent issue that needs to be addressed by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a tamping device that weighs coffee powder before tamping, so that weighing and tamping can be completed in one step; another purpose of this invention is to provide a coffee machine that includes the above-mentioned tamping device, which has the same beneficial effects as the tamping device.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A powder pressing device, comprising:

[0007] support;

[0008] The hammer assembly is mounted on the bracket and reciprocates along the axis to compact the powder.

[0009] A funnel assembly includes a funnel and a funnel support, the funnel including a powder cavity for receiving the powder and a connecting ear; the funnel support is provided with a first connecting platform;

[0010] A weighing assembly includes a weighing device and a weighing pan frame for mounting the weighing device, the weighing pan frame being provided with a second connecting platform;

[0011] Before pressing the powder, the connecting ear overlaps with the second connecting platform. During pressing, the pressing hammer assembly moves toward the pressing direction, causing the funnel bracket and the weighing pan bracket to move relative to each other. The first connecting platform overlaps with the connecting ear, and the connecting ear disengages from the second connecting platform.

[0012] Optionally, it also includes a linkage mechanism, which includes a first linkage part that moves with the hammer assembly and a second linkage part that moves the funnel bracket, the second linkage part moving in the opposite direction with the first linkage part.

[0013] Optionally, the linkage mechanism is a lever assembly, which includes a fulcrum, and the first linkage part and the second linkage part are disposed on both sides of the fulcrum;

[0014] The pressure hammer assembly includes a pressure rod, and the funnel bracket includes a lifting platform. When pressing powder, the pressure rod presses against the first linkage part and moves in the direction of pressing powder. The second linkage part follows the first linkage part and moves in the opposite direction of pressing powder, thereby driving the lifting platform to move.

[0015] Optionally, the lever assembly includes a pivot mounted on the bracket and a rocker arm rotatably sleeved on the pivot, with the first linkage part and the second linkage part formed at both ends of the rocker arm.

[0016] Optionally, the end of the first linkage is provided with an upwardly curved baffle.

[0017] Optionally, the first connecting platform is located at the lower part of the funnel bracket, and the funnel bracket has a clearance space for the second connecting platform to pass through.

[0018] Optionally, the funnel support is provided with a guide post, and the guide post is fitted with a first elastic element, the two ends of the first elastic element respectively abutting against the bracket and the funnel support.

[0019] Optionally, one end of the weighing device is connected to the weighing pan frame, and the other end of the weighing device is connected to the support.

[0020] Optionally, the weighing pan frame includes a lower assembly ring, an upper assembly ring, and a support frame located above the upper assembly ring. One end of the weighing device is connected to the support frame, and the other end of the weighing device is connected to the bracket.

[0021] The present invention provides a coffee machine, including the tamping device described in any of the above claims.

[0022] The beneficial effect of the present invention is that the connecting ears of the powder pressing device can be connected to the first connecting platform of the funnel bracket and the second connecting platform of the weighing component respectively, so as to realize the rapid switching between the two working conditions of weighing and powder pressing.

[0023] By applying the technical solution provided in the embodiments of the present invention, the weighing device is unloaded during powder compaction, avoiding impact or creep error on the weighing device. The weighing device only works under low pressure or zero pressure weighing conditions, significantly extending the service life of the weighing component. The overlapping switching realizes both weighing and compaction functions without the need for an additional clutch mechanism, resulting in a simple structure that is easy to control.

[0024] The present invention also provides a coffee machine including any of the above-described tamping devices. Since the tamping devices described above have the aforementioned technical effects, the coffee machine having the tamping device should also have the corresponding technical effects. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the powder pressing device provided in a specific embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram showing the hidden structure before powder pressing;

[0028] Figure 3 This is a schematic diagram showing the connection of the powder pressing device to the funnel before powder pressing.

[0029] Figure 4 This is a schematic diagram illustrating the process of pressing powder while concealing certain structural elements.

[0030] Figure 5 This is a schematic diagram showing the connection of the funnel in the powder pressing device when it is in the powder pressing state.

[0031] Figure 6 This is a schematic diagram of the funnel support structure;

[0032] Figure 7 This is a schematic diagram of the rocker installation.

[0033] Figure 8 This is a schematic diagram of the weighing assembly.

[0034] Figure 9 This is a schematic diagram showing the connection between the funnel and the weighing pan frame;

[0035] Figure 10 This is a schematic diagram of the funnel structure;

[0036] Figure 11 This is a schematic diagram of the powder pressing device located in the powder guide pipe and powder receiving ring before the powder pressing process;

[0037] Figure 12 This is a schematic diagram of the powder guide pipe and powder receiving ring when the powder pressing device is in the powder pressing position;

[0038] Figure 13 This is a schematic diagram of the powder pressing device provided in another specific embodiment of the present invention;

[0039] Figure 14 This is a schematic diagram of the weighing pan frame in another embodiment.

[0040] Figure label:

[0041] 1-Small pressure hammer; 2-Drive gear; 3-Powder guide tube; 31-Powder guiding section; 32-Powder passage hole; 33-Powder dropping section; 34-Powder outlet; 4-Large pressure hammer; 41-Pressure rod; 5-Powder receiving ring; 51-Raised edge; 52-Outer edge; 6-Funnel; 61-Connecting ear; 611-Groove; 7-Funnel bracket; 71-First connecting platform; 72-Lifting platform; 73-Guide column; 74-Leaving space; 8- Weighing pan frame; 81-Second connecting platform; 82-Lower assembly ring; 83-Upper assembly ring; 84-Support frame; 85-Cavity; 9-Weighing device; 10-First elastic element; 11-Rocker; 111-Baffle; 12-Rotating shaft; 13-Bracket; 14-Handle; 15-L-shaped plate; 16-Crimping part; 161-Crimping rod; 162-Elastic part; 17-Reset torsion spring; 18-Second elastic element. Detailed Implementation

[0042] The core of this invention is to provide a tamping device that enables weighing and tamping of coffee powder in one operation; another core aspect of this invention is to provide a coffee machine that includes the above-mentioned tamping device, which has the same beneficial effects as the tamping device.

[0043] 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.

[0044] In one specific embodiment, please refer to Figures 1 to 12 The tamping device provided by the present invention includes a support 13, a hammer assembly, a funnel assembly, and a weighing assembly. The support 13 is used to provide support and serves as the structural foundation of the entire tamping device. Specifically, the support 13 can be a support frame designed specifically for the tamping device, or it can be the support frame of the electrical appliance on which the tamping device of this embodiment is installed, such as the coffee machine itself.

[0045] The tamping hammer assembly is mounted on the bracket 13 and reciprocates along the axis to compact the powder. The movement of the tamping hammer assembly compacts the powder; for example, in a coffee machine, it compacts the coffee powder to facilitate subsequent coffee extraction. In this embodiment, the direction of movement of the tamping hammer assembly can be determined according to the specific installation scenario. For example, referring to the attached drawings, the tamping hammer assembly is installed vertically. During tamping, the tamping hammer assembly moves downwards to compact the coffee powder, and then moves upwards to return to its original position for the next tamping cycle. In other embodiments, the tamping hammer assembly can be installed tilted or horizontally, depending on the overall layout of the coffee machine, and is not limited here. In this embodiment, the tamping action can be completed in one step or multiple times. That is, during tamping, the tamping hammer assembly can move back and forth only once. The tamping hammer assembly first moves in the tamping direction to compact the coffee powder, and then moves in the opposite direction to return to the initial position, waiting for the next tamping, thus completing the tamping action in one step; or, the tamping hammer assembly moves back and forth multiple times to compact the coffee powder multiple times to achieve the coffee puck compaction density required for extraction.

[0046] The funnel assembly includes a funnel 6 and a funnel support 7. The funnel 6 includes a powder cavity for receiving powder and a connecting lug 61. The funnel support 7 is provided with a first connecting platform 71. The weighing assembly includes a weighing device 9 and a weighing pan frame 8 for mounting the weighing device 9. The weighing pan frame 8 is provided with a second connecting platform 81. Before pressing the powder, the connecting lug 61 overlaps with the second connecting platform 81. During pressing, the pressing hammer assembly moves in the pressing direction, causing the funnel support 7 and the weighing pan frame 8 to move relative to each other, so that the first connecting platform 71 overlaps with the connecting lug 61, and the connecting lug 61 disengages from the second connecting platform 81.

[0047] It should be noted that both the funnel assembly and the weighing assembly are mounted on the bracket 13. The connecting ear 61 overlaps with the first connecting platform 71 of the funnel bracket 7 and the second connecting platform 81 of the weighing assembly, facilitating the switching of the connecting ear 61 between the first connecting platform 71 and the second connecting platform 81, thus enabling rapid switching between weighing and powder pressing conditions. Furthermore, the switching of the connecting ear 61 between the first connecting platform 71 and the second connecting platform 81 is driven by the movement of the pressure hammer assembly towards the powder pressing direction. That is, it can move only one of the funnel bracket 7 or the weighing pan bracket 8, or it can move both simultaneously, causing relative movement between them, thereby achieving the switching of the connecting ear 61 between the first connecting platform 71 and the second connecting platform 81.

[0048] The weighing and tamping of coffee powder will be explained using the movement of the funnel holder 7 driven by the tamping hammer assembly as an example.

[0049] Before tamping, when weighing, the connecting lug 61 of the funnel 6 directly overlaps the second connecting platform 81 of the weighing pan 8. Coffee powder is poured manually or automatically into the powder chamber of the funnel 6. The entire weight of the funnel 6 is transferred via the connecting lug 61 and the second connecting platform 81 to the weighing device 9 installed on the weighing pan 8. The weighing device 9, such as a weighing sensor or electronic scale, measures the weight of the coffee powder in the powder chamber in real time, ensuring a precise quantity of coffee powder for extraction and guaranteeing the quality of the extracted coffee. Furthermore, during weighing, the connecting lug 61 of the funnel 6 overlaps with the second connecting platform 81 of the weighing pan 8, but not with the first connecting platform 71 of the funnel holder 7. This avoids inaccurate weighing caused by the funnel holder 7 supporting the funnel 6, thus improving the accuracy of the coffee powder weighing.

[0050] During tamping, the tamping hammer assembly moves along the axis in the tamping direction to compact the coffee powder. During the tamping process, the tamping hammer assembly drives the funnel bracket 7 to move in the opposite direction of tamping. As the funnel bracket 7 moves, the first connecting platform 71 of the funnel bracket 7 overlaps with the connecting ear 61, and the connecting ear 61 separates from the second connecting platform 81 of the weighing pan frame 8. The tamping force is transmitted to the bracket 13 through the funnel bracket 7 and no longer acts on the weighing device 9, so as to avoid the tamping force from damaging the weighing device 9, affecting the weighing accuracy and service life of the weighing device 9, thereby protecting the weighing component from the influence of the tamping force.

[0051] By applying the technical solution provided in this embodiment of the invention, the weighing device 9 is unloaded during compaction, avoiding impact or creep errors. The weighing device 9 only operates under low-pressure or zero-pressure weighing conditions, significantly extending the service life of the weighing assembly. Furthermore, the compressive force is rigidly transmitted by the support 13, allowing for precise control of the compacted powder density. The overlapping switching mechanism achieves both weighing and compaction functions without the need for an additional clutch mechanism, resulting in a simple structure that is easy to control.

[0052] In some embodiments, based on the aforementioned support 13, hammer assembly, funnel assembly, and weighing assembly, a linkage mechanism is added to the powder pressing device. The linkage mechanism includes a first linkage part that moves with the hammer assembly and a second linkage part that moves the funnel support 7. The second linkage part moves in the opposite direction to the first linkage part.

[0053] It should be explained that the first linkage part moves with the pressure hammer assembly. The first linkage part can be set on the pressure hammer assembly so that the first linkage part moves directly with the pressure hammer assembly; or, the first linkage part can be set on the bracket 13 or other parts far away from the pressure hammer assembly, and the first linkage part can be triggered to move with the pressure hammer assembly by moving the pressure hammer assembly.

[0054] Similarly, the second linkage can drive the funnel bracket 7 to move. The second linkage can be located on the funnel bracket 7, and the movement of the second linkage can directly drive the funnel bracket 7 to move; or, the second linkage can be located on the bracket 13 or other components far away from the funnel bracket 7, and the movement of the second linkage can trigger the funnel bracket 7 to follow its movement.

[0055] The second linkage moves in the opposite direction to the first linkage; that is, the second linkage moves under the influence of the first linkage, and the two move in opposite directions. For example, when pressing powder, the first linkage moves in the direction of pressing powder under the influence of the hammer assembly. At the same time, the first linkage drives the second linkage to move in the opposite direction of pressing powder, so that the second linkage drives the funnel support 7 to move in the opposite direction of pressing powder.

[0056] The linkage mechanism decomposes the linear motion of the hammer assembly into two components: a downward component for compacting the powder, and an upward component generated through the displacement transmission of the first and second linkage parts, causing the funnel support 7 to begin lifting before the hammer assembly reaches the powder surface. The first connecting platform 71 of the funnel support 7 overlaps with the connecting ear 61 of the funnel 6 before compaction, and disengages the connecting ear 61 from the second connecting platform 81 of the weighing assembly, thus switching between weighing and compaction modes. During this process, the hammer assembly also serves as the power source for the linkage mechanism, using its own power to drive the funnel support 7, eliminating the need for a separate cylinder or motor, reducing energy consumption and wiring complexity.

[0057] Specifically, when powder is injected into funnel 6, the hammer assembly is in a high position, the first linkage and the second linkage maintain an initial free state, and funnel 6 is stationary; the connecting ear 61 of funnel 6 is attached to the second connecting platform 81, and the weighing device 9 monitors the weight of the powder.

[0058] When the pressure hammer assembly starts to descend, the linkage mechanism uses the stroke energy of the pressure hammer assembly to compact the coffee powder. The first linkage part moves down with the pressure hammer assembly. Through the mechanical gain of the second linkage part, the displacement direction is reversed and transmitted to the funnel holder 7. The funnel holder 7 begins to rise. The first connecting platform 71 gradually approaches the connecting ear 61. As the pressure hammer assembly continues to descend, the funnel holder 7 rises until its first connecting platform 71 and connecting ear 61 are connected. The connecting ear 61 is then separated from the second connecting platform 81.

[0059] As the pressure hammer assembly continues to descend, the powder is compacted. During the compaction process, since the connecting ear 61 has been disengaged from the second connecting platform 81 of the weighing pan frame 8, the weighing device 9 is prevented from being damaged by the compaction force.

[0060] After compaction is complete, the tamping hammer assembly moves upward, the first linkage part rises accordingly, the second linkage part loses support, releasing the lifting force on the funnel 6, and the funnel support 7 falls back under its own weight or the action of the return spring; the first connecting platform 71 separates from the connecting ear 61, the connecting ear 61 reattaches to the second connecting platform 81, and the weighing device 9 once again supports the funnel 6, preparing for the subsequent weighing and tamping of coffee powder for extraction.

[0061] In some embodiments, the linkage mechanism can specifically be a lever assembly, which includes a fulcrum providing a center of rotation. The lever body spans the fulcrum, with a first linkage part and a second linkage part forming at both ends, located on either side of the fulcrum. The pressure hammer assembly includes a pressure rod 41, which moves up and down synchronously with the pressure hammer assembly. The funnel support 7 includes a lifting platform 72, which can lift or release the lifting platform 72 when the second linkage part rotates around the fulcrum. During powder pressing, the pressure rod 41 presses against the first linkage part and moves in the powder pressing direction, while the second linkage part follows the first linkage part and moves in the opposite direction, driving the lifting platform 72 to move.

[0062] It should be explained that the lever assembly follows the principle of torque balance. The pressure rod 41 applies downward force to the first linkage part; the second linkage part applies upward force to the lifting platform 72. By rationally designing the ratio of the two lever arms, the larger stroke and smaller force value of the pressure hammer assembly can be converted into the smaller stroke and larger lifting force required by the funnel bracket 7, achieving a flexible match of saving effort, increasing speed, or amplifying stroke. When the pressure rod 41 moves downward, the first linkage part is pressed down, the lever body rotates around the fulcrum, and the second linkage part tilts upward accordingly, thereby lifting the funnel bracket 7 in advance or immediately, completing the switch between weighing and compaction conditions.

[0063] Before pressing the powder, the hammer assembly is in the upper position, and the pressure rod 41 maintains a distance or lightly touches the first linkage part; the connecting ear 61 is attached to the second connecting platform 81, and the weighing device 9 measures the weight of the powder.

[0064] When pressing powder, the hammer assembly moves downward, the pressure rod 41 contacts the first linkage part, and the lever body begins to rotate around the fulcrum; the second linkage part swings upward and contacts the lifting platform 72 of the funnel bracket 7, and the funnel bracket 7 begins to be lifted.

[0065] As the lever body continues to rotate, the second linkage lifts the funnel bracket 7 to the designed height via the lifting platform 72. The first connecting platform 71 overlaps with the connecting ear 61, and the connecting ear 61 disengages from the second connecting platform 81. At this time, the end face of the tamping hammer assembly has not yet contacted, has just contacted, or has penetrated into the powder. Then, it begins to compact the coffee powder. Since the second connecting platform 81 has disengaged from the connecting ear 61, the weighing device 9 is protected from damage by the tamping force.

[0066] When the pressure hammer assembly returns, the pressure rod 41 moves upward, the first linkage loses downward pressure, and the lever swings back under its own weight or the action of the return spring; the second linkage descends, the lifting platform 72 falls back, the first connecting platform 71 separates from the connecting ear 61, the connecting ear 61 reconnects to the second connecting platform 81, the weighing device 9 carries the funnel 6 again, and the system returns to the standby state.

[0067] In this embodiment, the lever assembly is driven by the kinetic energy of the hammer assembly itself, eliminating the need for an additional motor or cylinder, thus reducing energy consumption and wiring complexity. The lever assembly has no elastic hysteresis, ensuring precise control of the lifting of the funnel support 7 and the pressing of the hammer assembly. By adjusting the fulcrum position or the length of the lever arms, the stroke and lifting force of the funnel support 7 can be quickly changed without changing the power source, adapting to different powder pressing forces.

[0068] It should be noted that the powder-pressing force of the hammer assembly is related not only to the lever assembly but also to the second elastic element 18 on the outer side of the hammer assembly. Specifically, a guide rod is provided on the outer side of the hammer assembly, and the guide rod is parallel to the hammer body axis. Preferably, the bracket 13 has corresponding guide holes, and the lower end of the guide rod passes through the corresponding guide hole to form a rod-hole sliding pair.

[0069] A second elastic element 18 is fitted onto the guide rod. The second elastic element 18 can be a cylindrical compression spring or a butterfly spring assembly. Its upper end is fixed to the spring seat of the pressure hammer assembly, and its lower end is fixed to the spring seat of the bracket 13. During installation, the second elastic element 18 already has a preset constant compression amount. Due to the constant compression amount, the second elastic element 18 generates a constant upward elastic force. This force acts on the pressure hammer assembly during the powder pressing stroke. Therefore, the pressure hammer assembly generates a preset powder pressing force under the action of the second elastic element 18 with the set compression amount. After the powder pressing is completed, the pressure hammer assembly can be quickly and smoothly lifted away from the powder cake under the action of the second elastic element 18.

[0070] It should also be noted that the linkage mechanism can take various forms, including but not limited to inclined wedges, roller-cam, rack-gear, and connecting rod grooves. By changing the wedge angle or cam curve, the lifting stroke of the funnel bracket 7 can be quickly changed to adapt to different powder height and compressibility requirements.

[0071] In some embodiments, the lever assembly includes a rotating shaft 12 mounted on a bracket 13 and a rocker plate 11 rotatably sleeved on the rotating shaft 12, with a first linkage portion and a second linkage portion formed at both ends of the rocker plate 11.

[0072] It should be explained that the pivot 12 is the aforementioned fulcrum, and the rocker arm 11 is the aforementioned lever body. The rocker arm 11 is generally strip-shaped or plate-shaped, with a shaft hole in the middle, and is rotatably fitted onto the pivot 12 via bearings or clearance fit; the rocker arm 11 can reciprocate around the pivot 12. The first linkage is formed by one end of the rocker arm 11, located on one side of the pivot 12, and is used to receive the downward force of the pressure rod 41 in the pressure hammer assembly. The second linkage is formed by the other end of the rocker arm 11, located on the other side of the pivot 12, and is used to lift the lifting platform 72 of the funnel bracket 7 upward.

[0073] The leverage ratio is determined by the distances from the first and second linkages to the center of the rotating shaft 12. The downward movement of the pressure rod 41 applies a downward force to the first linkage, generating a torque; this torque is converted into an upward force on the second linkage through the rotating shaft 12, thereby driving the funnel support 7 to rise. By simply changing the arm lengths of the first and second linkages or the mounting hole positions of the rotating shaft 12, different support strokes and force amplification factors can be obtained without replacing parts, adapting to various powder heights and compaction requirements.

[0074] Since the rocker arm 11 is directly fitted onto the rotating shaft 12, the kinematic pair is only a rotary pair, resulting in low friction and no idle return stroke, which can ensure high response and low wear synchronous linkage; the number of parts is small, the assembly is simple, and the rotary pair has no backlash, ensuring the repeatability accuracy of the action.

[0075] In some embodiments, the bottom surface of the pressure rod 41 is a contact surface that fits against the upper surface of the first linkage part. This contact surface can be a plane, an inclined plane, an arc surface, etc. Taking an inclined plane as an example, the inclined plane gradually decreases from the front end to the rear end of the pressure rod 41. The upper surface of one end of the first linkage part, i.e., the rocker arm 11, is an inclined plane that is complementary to the bottom surface of the pressure rod 41, and the first linkage part and the bottom surface of the pressure rod 41 can form a surface-to-surface fit. It should be noted that the included angle of the inclined plane is smaller than the friction self-locking angle. When the pressure rod 41 returns, it only needs to be slightly lifted to disengage from the inclined plane, and the lever quickly returns to its original position under its own weight or the action of the return torsion spring 17.

[0076] As the pressure hammer assembly moves downward, the inclined surface of the bottom of the pressure rod 41 first contacts the inclined surface of the first linkage part, and the contact area gradually expands from a line to a surface; as the pressure rod 41 continues to move downward, the inclined surface converts the vertical displacement into the rotation of the lever around the fulcrum, and the second linkage part raises the funnel bracket 7 accordingly.

[0077] The end of the first linkage is provided with an upward-curving baffle 111. The baffle 111 is located at the end of the first linkage, that is, at the end away from the fulcrum. The baffle 111 serves as a mechanical limit. When the front end face of the pressure rod 41 touches the baffle 111, the lever reaches the maximum rotation angle and is rigidly locked, preventing the pressure rod 41 from continuing to slide forward and preventing the pressure rod 41 from disengaging from the end of the first linkage. This causes the funnel bracket 7 to disengage from the second linkage, which in turn causes the funnel 6 to be supported by the weighing pan frame 8 during powder pressing, and the powder pressing force to damage the weighing device 9.

[0078] In some embodiments, the first connecting platform 71 is located at the lower part of the funnel bracket 7, and the funnel bracket 7 is provided with a clearance space 74 for the second connecting platform 81 to pass through.

[0079] It should be noted that the size of the clearance space 74 is larger than the shape of the second connecting platform 81. A gap is maintained between the side wall of the clearance space 74 and the second connecting platform 81 to prevent them from colliding during relative movement. This is to prevent the tamping force from being undesirably applied to the weighing pan frame 8 due to contact between the two during tamping. At the same time, designing the clearance space 74 to be larger than the shape of the second connecting platform 81 can also prevent interference with the weighing pan frame 8 due to contact between the two during weighing, which would result in inaccurate weighing of the coffee powder.

[0080] During the weighing phase, the second connecting platform 81 overlaps with the connecting ear 61. During powder compaction, as the funnel support 7 moves in the opposite direction of powder compaction along with the hammer assembly, the second connecting platform 81 remains stationary, while the first connecting platform 71 rises relative to the second connecting platform 81 along with the funnel support 7. Additionally, the clearance space 74 provided in the funnel support 7 also rises relative to the second connecting platform 81. As the first connecting platform 71 continues to rise, its upper surface contacts and supports the connecting ear 61, and the second connecting platform 81 disengages from the connecting ear 61. Upon completion of powder compaction, the funnel support 7 falls back down, the first connecting platform 71 descends, and the connecting ear 61 falls back onto the second connecting platform 81. The weighing device 9 resumes its supporting function, and the system returns to standby mode.

[0081] Specifically, in the specific implementation shown in the attached drawings, the funnel support 7 and the weighing pan support 8 are assembled as a set, meaning that the weighing pan support 8 is fitted onto the outside of the funnel support 7 and covers part of the outer shell of the funnel support 7. The second connecting platform 81 is located inside the weighing pan support 8 and passes through the clearance space 74 of the funnel support 7. In the circumferential direction, the first connecting platform 71 and the second connecting platform 81 are in a close area. Before pressing the powder, the second connecting platform 81 is located above the first connecting platform 71, so that the connecting ear 61 is supported by the second connecting platform 81. During the pressing process, as the funnel support 7 moves upward, the position of the first connecting platform 71 rises accordingly, gradually rising until it is flush with the second connecting platform 81, and the first connecting platform 71 contacts the connecting ear 61. As the first connecting platform 71 continues to rise, it is located above the second connecting platform 81, and the connecting ear 61 is supported by the first connecting platform 71.

[0082] In the above structure, the second connecting platform 81 and the funnel bracket 7 form a through-hole relationship, and the two are moved alternately by utilizing the clearance space 74. There is no lateral slippage or impact noise during the switching process, which significantly improves the system reliability and service life.

[0083] For example, the clearance space 74 is configured as a space extending downward from the clearance hole formed on the top of the funnel bracket 7. The second connecting platform 81 can be a vertical column or a tongue-shaped boss. The outline of the clearance hole is larger than the cross-section of the second connecting platform 81. When the second connecting platform 81 passes through the clearance hole, there is a gap between the clearance hole and the second connecting platform 81, which allows the two to slide relative to each other in the vertical direction while preventing radial collision. Specifically, the surface width of the second connecting platform 81 is smaller than the surface width of the connecting ear 61 to improve the smoothness of the connection ear 61 when it overlaps and switches with the first connecting platform 71.

[0084] In some embodiments, the funnel bracket 7 is provided with a guide post 73, and a first elastic element 10 is sleeved on the guide post 73. Specifically, the first elastic element 10 may be a cylindrical compression spring, a disc spring, or an elastic rubber sleeve. The two ends of the first elastic element 10 abut against the bracket 13 and the funnel bracket 7, respectively. Specifically, the bracket 13 has a limiting hole, the inner diameter of which is slightly larger than the outer diameter of the guide post 73. The guide post 73 passes through the limiting hole, forming a clearance sliding fit, which restricts the lateral displacement and rotational freedom of the funnel bracket 7. The bracket 13 and the funnel bracket 7 together constitute a mechanical hard limit, preventing the first elastic element 10 from being excessively compressed or stretched.

[0085] It should be explained that the first elastic element 10 ensures that the funnel bracket 7 is always under preload in the vertical direction. The preload of the first elastic element 10 pushes the funnel bracket 7 downward, keeping it in a low position in the standby state, ensuring that the first connecting platform 71 is separated from the connecting ear 61, and the second connecting platform 81 alone supports the funnel 6. When the lever assembly removes the lifting force, the compressive potential energy stored in the first elastic element 10 is released, pushing the funnel bracket 7 to quickly and smoothly fall back to the initial position.

[0086] In some embodiments, one end of the weighing device 9 is connected to the weighing pan frame 8. Specifically, a socket is designed on the side wall of the weighing pan frame 8. One end of the weighing device 9 is inserted into the socket on the side wall. The insertion end is a columnar or flat plug, which is directly inserted into the socket on the side wall of the weighing pan frame 8. The socket and the plug adopt a clearance fit or a small interference fit to ensure positioning accuracy and facilitate quick assembly and disassembly. The other end is connected to the bracket 13. Specifically, referring to the attached drawings, the other end of the weighing device 9 can be connected and fixed to the bracket 13 by means of an L-shaped plate 15, and the two can be fixed by screws, riveting or welding.

[0087] During weighing, the funnel 6 is pressed against the weighing pan frame 8 through the connecting ear 61. The pressure on the weighing pan frame 8 is transmitted to the weighing device 9 through the connection with the weighing device 9. This pressure causes the weighing device 9 to deform and generate a sensing signal, thereby realizing the weighing of the amount of coffee powder in the funnel 6.

[0088] The weighing device 9 is directly installed by the weighing pan frame 8 and the bracket 13, which can reduce the structural complexity of the weighing pan frame 8. Furthermore, the weighing device 9 is rigidly constrained by the bracket 13 in the horizontal direction and is only subjected to the bending of the cantilever beam in the vertical direction, which can effectively suppress the influence of lateral forces on the weighing accuracy.

[0089] See attached document Figure 13 , 14 In another embodiment, the weighing pan frame 8 includes a lower mounting ring 82, an upper mounting ring 83, and a support frame 84 located above the upper mounting ring 83. One end of the weighing device 9 is connected to the support frame 84, and the other end is connected to the bracket 13 through a connecting frame.

[0090] It should be explained that the lower assembly ring 82 is located below the upper assembly ring 83. It is a circular or rectangular ring-shaped plate and serves as the installation interface between the entire weighing pan frame 8 and the bracket 13. The central through hole avoids the funnel 6, and the funnel 6 is detachably connected to the lower assembly ring 82.

[0091] The second connecting platform 81 is provided on the lower assembly ring 82. Preferably, at least two sets of second connecting platforms 81 are arranged circumferentially on the ring body. When the powder is falling and weighing, the connecting ear 61 of the funnel 6 overlaps on the second connecting platform 81.

[0092] Multiple vertical rods extend downward from the bottom surface of the upper assembly ring 83 in a horizontal circular shape, and are rigidly connected to the lower assembly ring 82 through the vertical rods to form a double-layer ring frame.

[0093] The support frame 84 is located above the upper assembly ring 83 and can be connected to the top surface of the upper assembly ring 83 via ribs or flanges to form a horizontal bridge plate or a П-shaped beam, which serves as a fixed reference for one end of the weighing device 9. The other end of the weighing device 9 is connected to the bracket 13 via a connecting frame.

[0094] Weighing device 9 is fixedly supported at both ends. During weighing, the force is transmitted sequentially through funnel 6, connecting lug 61, weighing pan frame 8, and weighing device 9. This path is short, rigid, and distributes the force evenly, significantly improving resistance to lateral bending moments. It also reduces the additional bending moment at the end of the cantilever beam, avoiding deflection errors caused by the cantilever structure. Weighing device 9 is located at the top, away from the coffee powder and tamping area, effectively reducing the risk of dust intrusion and accidental impact, balancing performance and durability.

[0095] Preferably, the upper mounting ring 83 and the support frame 84 are integrally formed, which has excellent anti-vibration and anti-eccentricity capabilities, ensuring long-term stable readings; the upper mounting ring 83 and the connecting frame form a modular assembly that can be disassembled as a whole, and during installation, it is only necessary to lock the upper mounting ring 83 onto the lower mounting ring 82, making the connection convenient.

[0096] In a preferred embodiment, the tamping device provided by the present invention further includes a powder guide tube 3. The tamping hammer assembly adopts a coaxial nested double-hammer structure, including a small tamping hammer 1 and a large tamping hammer 4 coaxially arranged. The large tamping hammer 4 is located outside the small tamping hammer 1, and the bottom surfaces of the small tamping hammer 1 and the large tamping hammer 4 together form the tamping surface. In this embodiment, the large tamping hammer 4 is located outside the small tamping hammer 1. The large tamping hammer 4 may only cover part of the outer shell of the small tamping hammer 1, or the large tamping hammer 4 may cover the entire outer shell of the small tamping hammer 1. The powder guide tube 3 includes a powder guiding section 31 and a powder dropping section 33. A powder passage hole 32 is provided at the connection between the powder guiding section 31 and the powder dropping section 33. Coffee powder enters the powder dropping section 33 through the powder guiding section 31 and the powder passage hole 32. The powder dropping section 33 is located between the small tamping hammer 1 and the large tamping hammer 4. A powder outlet 34 is provided at the end of the powder dropping section 33, and the coffee powder is finally discharged through the powder outlet 34. In this embodiment, the powder-dropping section 33 is located between the small pressure hammer 1 and the large pressure hammer 4; that is, a gap is left between the small pressure hammer 1 and the large pressure hammer 4, and the powder-dropping section 33 is installed in this gap. Preferably, the inner wall of the powder guide tube 3 is treated with Teflon, resulting in extremely low surface energy and preventing residual powder adhesion. Alternatively, the inside of the powder guide tube 3 is polished, resulting in a high degree of surface smoothness on the inner wall, reducing the amount of residual coffee powder.

[0097] It should be noted that the coffee powder first enters the powder-feeding section 31, then passes through the powder-feeding hole 32 into the powder-feeding section 33, and finally exits from the powder outlet 34 at the end of the powder-feeding section 33. Since the powder-feeding section 33 is located in the gap between the small pressure hammer 1 and the large pressure hammer 4, the coffee powder is forced to be guided closer to the center during powder feeding, forming a uniform powder pile.

[0098] After the coffee grounds are collected, the tamping surface formed by the bottom surfaces of the small tamping hammer 1 and the large tamping hammer 4 is used to compact the coffee grounds. Because the coffee grounds form a uniform pile under the guidance of the powder guide tube 3, a uniform, flat, and consistent density pouch can be formed without manual assistance during tamping. This avoids the existing problems of uneven coffee grounds causing skewed pouches and inconsistent compaction density, thus preventing the channeling effect caused by inconsistent coffee pouches from affecting the quality of the extracted coffee liquid. This provides a foundation for the subsequent extraction of high-quality, flavorful coffee.

[0099] By applying the technical solution provided in the embodiments of the present invention, the pressure hammer assembly is designed as a double-hammer structure of a small pressure hammer 1 and a large pressure hammer 4. The gap between the two pressure hammers provides an installation base for the powder guide tube 3, so that the powder outlet 34 at the end of the powder guide tube 3 can be located between the two hammers. This facilitates the guidance of coffee powder discharged from the powder outlet 34 to a region closer to the center, achieving a uniform distribution of coffee powder. This makes it easier to obtain a coffee cake with a uniform density during subsequent tamping, ensuring uniform water penetration during extraction, reducing channeling effects, and improving extraction rate and flavor stability.

[0100] In some embodiments, the tamping device provided by the present invention further includes a driving mechanism. The driving mechanism is connected to the small tamping hammer 1. After the driving mechanism drives the small tamping hammer 1 to move until its bottom surface is flush with the bottom surface of the large tamping hammer 4, it continues to drive the small tamping hammer 1 and the large tamping hammer 4 to move and compact the coffee powder. When the driving mechanism drives the small tamping hammer 1 to move relative to the axis of the large tamping hammer 4, the powder passage hole 32 is blocked or opened by the small tamping hammer 1.

[0101] It should be explained that the drive mechanism includes a power source and a transmission mechanism. The power source can be manual or electric, for example, manually operated using a handle 14, or automatically operated using a motor, servo cylinder, etc. That is, this embodiment is applicable to both manual and automatic powder compaction. The transmission mechanism of the drive mechanism is connected to the small hammer 1. For example, the handle 14 drives the drive gear 2 to rotate through a transmission gear set, and the small hammer 1 is equipped with a rack that meshes with the drive gear 2. During the powder compaction process, initially only the small hammer 1 is driven to move in the powder compaction direction, making it move axially relative to the large hammer 4. After the bottom surface of the small hammer 1 is flush with the bottom surface of the large hammer 4, the drive mechanism drives the small hammer 1 and the large hammer 4 together to move in the powder compaction direction, completing the compaction. In this embodiment, only the drive mechanism drives the small hammer 1 to move, and then the small hammer 1 drives the large hammer 4 to move, which reduces the complexity of the drive mechanism, simplifies the structure, and helps reduce manufacturing and assembly costs.

[0102] It should also be explained that the outer wall of the large pressure hammer 4 has a notch or groove corresponding to the powder-drawing section 31, and the powder-dropping section 33 is fitted inside the large pressure hammer 4, with the powder-drawing section 31 extending out from the notch or groove. The outer diameter of the small pressure hammer 1 matches the inner diameter of the powder-dropping section 33, and the powder-passing hole 32 is located on the sliding path of the outer wall of the small pressure hammer 1. When the small pressure hammer 1 is in the initial state, the small pressure hammer 1 and the powder-passing hole 32 are staggered, and the powder-passing hole 32 is in the open state, allowing the coffee powder from the powder-drawing section 31 to enter the powder-dropping section 33 through the open powder-passing hole 32; when the small pressure hammer 1 is in the tamping state, as the small pressure hammer 1 moves, it will gradually cover the powder-passing hole 32 until the powder-passing hole 32 is completely blocked by the small pressure hammer 1.

[0103] When the small hammer 1 moves until its bottom surface is flush with the bottom surface of the large hammer 4, the bottom surfaces of the small hammer 1 and the large hammer 4 together form a tamping surface. The two continue to move in the tamping direction as a whole to compact the coffee powder.

[0104] The above structure opens and closes the powder passage 32 through the small pressure hammer 1. The axial displacement of the small pressure hammer 1 acts as a valve, eliminating the need for an additional solenoid valve or rotating plate. This allows for switching between powder dropping and powder cutting off, reducing the number of system parts, lowering the failure rate, shrinking the assembly space, and reducing costs.

[0105] In some embodiments, the small hammer 1 is provided with a pressing part, and the large hammer 4 is provided with a bearing part. When the small hammer 1 moves to the bottom surface being flush with the bottom surface of the large hammer 4, the pressing part abuts against the bearing part.

[0106] It should be noted that the hammer body of the small hammer 1 has an outwardly extending portion to form a pressing part, which can be a flange, a step, an annular shoulder, or evenly distributed protrusions. Alternatively, the outer side of the hammer body of the small hammer 1 has an inwardly recessed portion to form a pressing part. For example, the hammer body of the small hammer 1 is a semi-cylinder formed by a semi-circular arc surface and a vertical surface, which ensures good guiding effect and reduces weight. Furthermore, the bottom surface of the hammer body of the small hammer 1 is designed to be circular to facilitate cooperation with the large hammer 4 to form a complete powder pressing surface. The inner hole of the hammer body of the large hammer 4 is a cylindrical hole, and the powder falling section 33 of the powder guide tube 3 is a cylindrical ring. The hammer body of the small hammer 1, the powder falling section 33, and the hammer body of the large hammer 4 are sequentially and intermittently fitted together to ensure smooth axial relative movement.

[0107] Correspondingly, the large pressure hammer 4 is designed with a pressure-bearing part on its inner wall or end face. This pressure-bearing part can protrude or be recessed relative to the inner wall / end face of the large pressure hammer 4 to cooperate with the downward pressing part of the small pressure hammer 1. For example, when the downward pressing part is a protruding structure, the pressure-bearing part can be designed as a recessed or protruding structure, such as an inner protruding ring or a shoulder; or, when the downward pressing part is a recessed structure, the pressure-bearing part can be designed as a protruding structure. When the small pressure hammer 1 moves to the point where its bottom surface is flush with the bottom surface of the large pressure hammer 4, the downward pressing part and the pressure-bearing part form a surface-to-surface or line-to-surface contact, achieving rigid force transmission.

[0108] As can be seen from the above, the small hammer 1 drives the large hammer 4 to move through the contact and cooperation between the pressing part and the bearing part. The independent drive or complex linkage mechanism of the large hammer 4 is eliminated. Only one linear power source is needed to realize the compound action of the small hammer 1 first independently and then the small hammer 1 and the large hammer 4 synchronously. The number of parts is reduced and the cost is lowered.

[0109] In some embodiments, a return torsion spring 17 is provided inside the handle 14. Specifically, the return torsion spring 17 is installed on the connecting shaft of the handle 14, with one end locked in the handle 14 housing and the other end connected to the coffee machine body of the tamping device used in this embodiment. The free angle of the return torsion spring 17 is pre-tightened, so that the handle 14 is always subjected to a torque in the counterclockwise return direction, always attempting to return the handle 14 to its initial position. Through gear-rack transmission, this torque is converted into a continuous upward force acting on the small hammer 1, so that the handle 14 automatically returns to zero when released. In the event of an accidental power outage or human error, the small hammer 1 will not fall freely and damage the funnel 6.

[0110] When pressing the powder, the operator turns the handle 14 clockwise, and the reset torsion spring 17 is further twisted, increasing the energy storage; the rack drives the small hammer 1 to move down independently first, and then drives the large hammer 4 to overcome the elastic force of the second elastic element 18 and move down as a whole until the powder cake is compacted.

[0111] When the operator releases the handle or controls the motor to disconnect, the torque of the reset torsion spring 17 and the elastic force of the second elastic element 18 work together. During the return and lifting, the second elastic element 18 of the large pressure hammer 4 first lifts the small pressure hammer 1 and the large pressure hammer 4 together, and then the small pressure hammer 1 lifts alone under the action of the reset torsion spring 17.

[0112] In some embodiments, the pressing part includes a pressure plate disposed on the upper part of the small pressure hammer 1. Specifically, the pressure plate may be a horizontal or slightly tapered annular plate or a symmetrical straight plate, integrally formed or threadedly locked to the outer edge 52 of the upper part of the small pressure hammer 1, and the outer diameter is larger than the inner diameter of the large pressure hammer 4.

[0113] The pressure-bearing part includes a pressure-bearing plate located on top of the large pressure hammer 4. Specifically, the pressure-bearing plate can be configured as an annular plate corresponding to the position of the pressure plate, located on the inner side or upper end face of the top of the large pressure hammer 4, and arranged in a mirror image of the pressure plate. Preferably, the contact surfaces of the pressure plate and the pressure-bearing plate can be polished or fitted with low-friction pads.

[0114] And / or, the pressing part includes a pressing edge provided on the bottom edge of the small pressing hammer 1, the pressing edge being an annular surface extending inward from the bottom edge of the small pressing hammer 1, for directly pressing the large pressing hammer 4 at the end of the stroke.

[0115] The pressure-bearing part includes a pressure-bearing edge located at the inner end of the large pressure hammer 4. The pressure-bearing edge has an annular shoulder or evenly distributed boss extending inward from the lower end of the inner wall of the large pressure hammer 4, and is axially aligned with the pressure edge. The pressure-bearing edge also serves as part of the bottom surface of the large pressure hammer 4, improving local rigidity and reducing the end gap between the large pressure hammer 4 and the small pressure hammer 1, avoiding gaps in the powder pressing surface caused by the gap between the two, and improving the powder pressing effect.

[0116] When the small pressure hammer 1 moves to the point where its bottom surface is flush with the bottom surface of the large pressure hammer 4, the pressure plate abuts against the bearing plate, and / or the pressure edge abuts against the bearing edge. These two force transmission methods can be used individually or simultaneously. Depending on the working conditions, a single or dual-path transmission of the powder-pressing force can be selected. For example, under light loads, a single pressure plate abutting against the bearing plate or a single pressure edge abutting against the bearing edge can be chosen, resulting in a simple structure and reduced friction pairs. Under heavy loads, simultaneous abutment at both the top and bottom points achieves dual-path force transmission, improving load-bearing capacity and resistance to eccentric loads. The double-ring contact surface disperses the powder-pressing force over a larger area, significantly reducing local stress concentration under high-pressure conditions, preventing local deformation, and extending component life.

[0117] In a preferred embodiment, the coffee tamping device provided by the present invention further includes a coffee receiving ring 5. One end of the coffee receiving ring 5 has an overlapping portion with the tamping hammer assembly. When coffee powder falls into the funnel 6, the other end of the coffee receiving ring 5 has a gap with the funnel 6. When the tamping hammer assembly compacts the coffee powder, the other end of the coffee receiving ring 5 abuts against the funnel 6.

[0118] In the above structure, the weighing assembly includes at least a weighing device 9 to detect the weight of the coffee powder. Alternatively, in addition to the weighing device 9, it also includes a weighing pan frame 8 on which the weighing device 9 is mounted. When the weighing assembly detects that the amount of coffee powder added to the funnel 6 has reached a set value, it stops dispensing the powder to provide a fixed amount of coffee powder for extraction.

[0119] After the coffee powder is weighed, the powder is in a loose state. The tamping hammer assembly moves towards the funnel 6 to compact the measured amount of coffee powder in the funnel 6. The tamping hammer assembly is driven by a motor / handle 14 to achieve automatic or manual tamping.

[0120] The powder receiving ring 5 is positioned between the pressure hammer assembly and the funnel 6, connecting the space between them into a powder-passing channel. This provides precise guidance for the coffee powder and minimizes splashing. In this specific implementation, the powder receiving ring 5 is designed as a hollow cylinder, and its inner wall is treated with Teflon or polished to prevent residual powder from adhering.

[0121] Taking the vertical installation of the powder receiving ring 5 shown in the attached figure as an example, the upper end of the powder receiving ring 5 and the tamping hammer assembly form an axially overlapping part. The inner and outer diameters of the overlapping part are precisely matched to form a dynamic sealing channel, blocking the path of coffee powder escaping from between the powder receiving ring 5 and the tamping hammer assembly.

[0122] The distance between the lower end of the powder receiving ring 5 and the upper end of the funnel 6 varies depending on the powder falling and pressing process:

[0123] During the powder dispensing stage, a gap is maintained between the lower end of the powder receiving ring 5 and the upper end of the funnel 6, keeping the powder receiving ring 5 and the funnel 6 separate. This prevents external forces from being transmitted to the weighing component through the powder receiving ring 5, ensuring that the weighing accuracy is not disturbed. While ensuring that the powder receiving ring 5 does not contact the funnel 6, the narrower the gap, the smaller the airflow disturbance, and the more thoroughly powder splashing is suppressed, thus achieving the optimal balance between accurate weighing and efficient powder dispensing.

[0124] During the compaction stage, the upper end face of the funnel 6 abuts against the lower end face of the powder receiving ring 5, forming a dense sealing boundary, eliminating the gap between the funnel 6 and the powder receiving ring 5, and preventing powder leakage.

[0125] In this embodiment, the gap between the powder receiving ring 5 and the funnel 6 can be eliminated by moving the funnel 6 or the powder receiving ring 5 individually, or by moving the funnel 6 and the powder receiving ring 5 simultaneously.

[0126] By applying the technical solution provided in the embodiments of the present invention, the problem of coffee powder flying can be reduced in coffee machines with weighing and compaction functions. During the powder falling period, there is a gap between the powder receiving ring 5 and the funnel 6, that is, the powder receiving ring 5 does not contact the funnel 6, so as to avoid the powder receiving ring 5 transmitting force to the funnel 6 due to contact between the two, which would affect the accuracy of the weighing component in weighing the coffee powder in the funnel 6. Moreover, the powder falls smoothly along the powder receiving ring 5. Under the blocking and limiting effect of the powder receiving ring 5, the amount of coffee powder splashing outward can be reduced. During compaction, the powder receiving ring 5 and the funnel 6 abut against each other, and the two fit tightly together to form a zero-gap barrier, preventing coffee powder from leaking out from the connection between the two.

[0127] In some embodiments, the powder receiving ring 5 is a vertical hollow cylinder, and the funnel bracket 7 is an annular frame, which is fitted onto the outside of the powder receiving ring 5. The powder receiving ring 5 and the funnel bracket 7 are axially slidingly engaged, which allows relative sliding while suppressing lateral swaying of the funnel bracket 7, ensuring the coaxiality of the sealing surfaces of the funnel 6 and the powder receiving ring 5.

[0128] The lower outer periphery of the powder receiving ring 5 is provided with a raised edge 51, which can be a continuous flange or spaced lugs. Specifically, the raised edge 51 has an inverted structure, the upper surface of the raised edge 51 is a finely machined flat surface, forming a flat load-bearing surface; the lower surface is provided with a draft angle for easy assembly and disassembly. The inner wall of the funnel bracket 7 is provided with a boss, which corresponds to the raised edge 51, and can be a ring of bosses or several bosses. The boss is supported above the raised edge 51. Specifically, the lower surface of the boss and the upper surface of the raised edge 51 fit together. The funnel bracket 7 can apply downward pressure using the boss to keep the powder receiving ring 5 in a low position and also prevent the two from separating.

[0129] When the funnel bracket 7 is driven upward by the linkage mechanism, the boss disengages from the upper surface of the protrusion 51 and moves upward along the powder receiving ring 5, driving the funnel 6 to move upward, so that the upper end of the funnel 6 abuts against the lower end of the powder receiving ring 5; when the funnel bracket 7 drives the funnel 6 to move downward and reset, the upper end of the funnel 6 and the lower end of the powder receiving ring 5 return to the initial gap, and the boss presses against the upper surface of the protrusion 51.

[0130] In some embodiments, the powder receiving ring 5 is slidably fitted with the pressure hammer assembly. Specifically, the powder receiving ring 5 is fitted outside the pressure hammer assembly, and the two can be coaxially fitted by a slide rail or linear bearing to improve the coaxiality of the movement.

[0131] During powder pressing, the funnel 6 pushes the powder receiving ring 5 to move. That is, after the funnel 6 and the powder receiving ring 5 come into contact and fit together, the movement of the funnel 6 can push the powder receiving ring 5 to move. In other words, the gap between the funnel 6 and the powder receiving ring 5 during powder dispensing is less than the displacement of the funnel 6. This allows the gap between the funnel 6 and the powder receiving ring 5 to be designed to be smaller during powder dispensing, reducing the amount of powder flying. Also, because the gap height is less than the upward displacement of the funnel 6, when the funnel 6 moves upward, the upper end face of the funnel 6 first comes into contact with the lower end face of the powder receiving ring 5, and then the funnel 6 drives the powder receiving ring 5 to continue to move upward synchronously, causing the funnel 6 to detach from the weighing component. This forms a reliable seal, reduces powder flying, and does not exert force on the weighing component during powder pressing, thus improving the service life of the weighing component.

[0132] In a preferred embodiment, the tamping device provided by the present invention includes a funnel 6 comprising a powder cavity for containing coffee powder, and a connecting lug 61 on the outer periphery of the funnel 6. The weighing assembly includes a weighing device 9 and a weighing pan frame 8 for mounting the weighing device 9; the weighing pan frame 8 has at least two sets of second connecting platforms 81 and pressing portions 16 distributed along its circumference, with the second connecting platforms 81 located below the pressing portions 16. When the funnel 6 is connected to the weighing assembly, the lower surface of the connecting lug 61 is supported by the second connecting platform 81, and the pressing portion 16 presses against the upper surface of the connecting lug 61.

[0133] In the above structure, the funnel 6 includes a shell that circumferentially encloses a powder cavity with an open top, through which coffee powder enters the powder cavity. Connecting ears 61 are located on the outside of the shell; specifically, multiple connecting ears 61 are spaced apart circumferentially along the outside of the shell for connecting to the weighing component, forming a mechanical interface for docking with the weighing component. Preferably, the connecting ears 61 are integrally formed with the funnel 6, and the upper and lower surfaces of the connecting ears 61 are precision machined to ensure accurate and reliable force transmission during weighing.

[0134] The weighing assembly consists of a weighing device 9 and a weighing pan frame 8. The weighing pan frame 8 has at least two sets of second connecting platforms 81 and pressing parts 16 arranged circumferentially. That is, the second connecting platforms 81 and pressing parts 16 are spaced apart along the circumference of the weighing pan frame 8, and the second connecting platforms 81 and pressing parts 16 are approximately aligned or partially staggered in the circumferential direction, with only an overlapping portion to clamp the connecting lug 61. The second connecting platform 81 is located below the pressing part 16, with a clamping gap reserved between them for the insertion of the connecting lug 61. The second connecting platform 81 directly supports the connecting lug 61, achieving vertical force bearing and transferring the powder weight to the weighing device 9 without attenuation. The pressing part 16 presses against the upper surface of the connecting lug 61, achieving reverse limiting and preventing the funnel 6 from falling off. Specifically, the pressing part 16 can adopt an elastic cantilever or a quick-release clamping plate, pre-tightening the connecting lug 61 downwards and automatically rebounding, eliminating gaps quickly and reliably locking the connecting lug 61.

[0135] The weight of the coffee powder added to the funnel 6 is transmitted to the weighing pan frame 8 via the connecting lug 61. The weighing device 9 installed on the weighing pan frame 8 senses this pressure and weighs the coffee powder added to the funnel 6. Preferably, the weighing device 9 can be a three-point high-precision sensor; it can also have real-time tare and overload protection. When overloaded, the funnel 6 first touches the mechanical hard limit, and the weighing device 9 is fully protected.

[0136] It is important to understand that the weighing process for coffee powder using the aforementioned tamping device includes the following steps:

[0137] The connecting lug 61 of the funnel 6 is placed between the second connecting platform 81 and the pressing part 16, forming a clamp-lock structure that securely locks the funnel 6. Coffee powder is poured into the powder chamber, and the weighing device 9 captures the weight changes in real time. During this process, the system can also monitor synchronously, stopping powder addition when the set weight is reached. Alternatively, when the funnel 6 is connected to the weighing component, its powder chamber already contains coffee powder. When the funnel 6 is locked by the second connecting platform 81 and the pressing part 16, the weighing device 9 can weigh the amount of coffee powder in the funnel 6.

[0138] When the weighing is complete and the funnel 6 needs to be disassembled, simply rotate the funnel 6 slightly in the opposite direction and the connecting lug 61 will be removed from the clamping area and detached from the weighing component.

[0139] Throughout the process, the second connecting platform 81 and the pressing part 16 clamp the connecting ear 61 from the top and bottom, constraining it circumferentially in the horizontal direction and clamping it bidirectionally in the vertical direction. The entire weight of the funnel 6 and the coffee powder is transferred to the weighing device 9 with zero loss, ensuring accurate and stable readings.

[0140] With the aforementioned coffee powder weighing device, the pressing part 16 and the second connecting platform 81 engage with the connecting ears 61, ensuring a reliable lock on the funnel 6. This allows for direct weighing of the coffee powder within the funnel 6, avoiding deviations caused by accumulated errors from indirect weighing. Furthermore, the weighing device in this embodiment eliminates gaps and elastic deformation associated with traditional threads or snap-fits, ensuring the weighing device 9 fully captures the weight of the coffee powder with minimal weighing error. Multiple sets of second connecting platforms 81 and pressing parts 16 provide even load distribution, preventing the funnel 6 from shaking or becoming eccentric, thus guaranteeing weighing accuracy. The funnel 6 can be locked or unlocked simply by lifting the pressing part 16 or gently rotating it, allowing for one-step assembly and disassembly without tools, resulting in high efficiency.

[0141] In some embodiments, the crimping part 16 includes a crimping rod 161, which is a rigid rod with its upper end placed in the internal cavity 85 of the weighing pan frame 8 and its lower end passing through the lower opening on the bottom surface of the cavity 85 and directly abutting against the upper surface of the connecting ear 61.

[0142] The crimping part 16 also includes an elastic part 162 that continuously presses the lower end of the crimping rod 161 against the upper surface of the connecting ear 61. The elastic part 162 can be a compression spring, a spring sheet, or an elastic body. The elastic part 162 is sleeved or abutted between the upper end of the crimping rod 161 and the top of the cavity 85, and always applies a downward elastic preload to the crimping rod 161 to eliminate the fit gap and improve the weighing accuracy.

[0143] The weighing pan frame 8 is provided with a cavity 85 for mounting the crimping part 16. The bottom surface of the cavity 85 has a lower opening, through which the lower end of the crimping rod 161 protrudes and abuts against the upper surface of the connecting ear 61. The cavity 85 not only provides guidance and protection for the crimping rod 161, but also limits its maximum stroke to prevent excessive compression or swaying. Furthermore, the cavity 85 structure allows the crimping rod 161 and the elastic part 162 to be hidden inside the cavity 85, preventing dust and powder and extending service life.

[0144] It should be noted that when weighing coffee powder, the funnel 6 is pushed between the second connecting platform 81 and the pressing rod 161. The connecting lug 61 then pushes up the pressing rod 161, and the elastic part 162 compresses and stores energy. Under the elastic force of the elastic part 162, it forms a self-locking clamp with the connecting lug 61, and the pressing rod 161 is firmly pressed against the connecting lug 61, completing the locking. During continuous weighing, the elastic part 162 always pushes the pressing rod 161 downward with its constant potential energy, so that the lower end maintains a continuous and stable positive pressure, firmly adhering to the upper surface of the connecting lug 61, with the gap returning to zero, making the weighing more accurate.

[0145] When the funnel 6 needs to be removed, gently lift the crimping rod 161 or rotate the funnel 6 to overcome the elastic force of the elastic part 162. The crimping rod 161 will then disengage from the connecting ear 61, and the funnel 6 can be removed. The entire process only requires overcoming the elastic force of the elastic part 162 to move the crimping rod 161 upward and release the connecting ear 61, without the need for any tools.

[0146] Throughout the process, the pre-compression force is set by the stiffness and compression amount of the elastic part 162, ensuring gapless pressing while avoiding excessive stress that could cause wear or deformation. By replacing the elastic part 162 with different stiffnesses or adjusting the pre-compression amount, it can be adapted to weighing coffee powder of different weight ranges, demonstrating strong compatibility.

[0147] In some embodiments, the crimping rod 161 has a radially protruding locking portion in its middle section, that is, the crimping rod 161 is designed with a radially varying portion. An elastic portion 162 is fitted onto the crimping rod 161, with its lower end abutting against the upper end face of the locking portion, and its upper end abutting against the top of the inner wall of the cavity 85. The bottom surface of the cavity 85 forms a locking surface around the lower opening. When the crimping rod 161 is assembled in place, the locking portion and the locking surface overlap, and the lower surface of the locking portion abuts against the locking surface, forming a mechanical stop that restricts the crimping rod 161 from continuing to move downwards, thereby preventing the elastic portion 162 from pushing the crimping rod 161 out of the cavity 85.

[0148] In some embodiments, the upper surface of the connecting ear 61 is provided with a groove 611 that matches the crimping rod 161, and the crimping rod 161 is inserted into the groove 611 during crimping.

[0149] Specifically, a groove 611 that matches the shape of the lower end of the crimping rod 161 is machined or stamped on the upper surface of the connecting ear 61. The center line of the groove 611 is coaxial with the axis of the crimping rod 161 to ensure that there is no lateral misalignment after assembly. Preferably, the cross-section of the groove 611 is usually V-shaped, U-shaped or arc-shaped, and the depth is slightly greater than the protrusion height of the head of the crimping rod 161.

[0150] During connection, the connecting ear 61 is pushed between the second connecting platform 81 and the crimping part 16. The crimping rod 161 rebounds quickly under the action of the elastic part 162, and its lower end slides into the bottom of the groove, emitting a click sound, completing the self-positioning locking. During the weighing stage, the crimping rod 161 is always embedded in the groove 611, and the groove 611 and the rod head fit together with zero gap. The funnel 6 cannot produce relative displacement regardless of lateral disturbances or high-frequency vibrations, and the weighing device 9 can continuously receive a stable and lossless weight signal.

[0151] By engaging the crimping rod 161 with the groove 611, the traditional surface crimping is upgraded to pin-groove positioning. The sidewall of the groove 611 restricts the horizontal displacement of the crimping rod 161, eliminating the swaying and eccentricity of the funnel 6 during weighing. The bottom surface of the groove 611 becomes the termination surface of the crimping rod 161, allowing the preload of the elastic part 162 to be transmitted vertically along the rod axis, avoiding the loss of component force. A slight interference or toothed engagement is formed between the groove 611 and the rod head, preventing the funnel 6 from rotating accidentally and improving the repeatability of positioning accuracy.

[0152] Based on the tamping device provided in the above embodiments, the present invention also provides a coffee machine, which includes any one of the tamping devices described in the above embodiments. Since this coffee machine uses the tamping device described in the above embodiments, the beneficial effects of this coffee machine are explained in the above embodiments. The structure of other parts of this coffee machine is described in the prior art and will not be repeated here.

[0153] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0154] The coffee machine and tamping device provided by this invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention. Therefore, this invention is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A powder pressing device, characterized in that, include: Frame (13); The hammer assembly is installed on the bracket (13) and reciprocates along the axis to compact the powder. The funnel assembly includes a funnel (6) and a funnel bracket (7), the funnel (6) including a powder cavity for receiving the powder and a connecting ear (61); the funnel bracket (7) is provided with a first connecting platform (71). The weighing assembly includes a weighing device (9) and a weighing pan frame (8) on which the weighing device (9) is mounted, the weighing pan frame (8) being provided with a second connecting platform (81). Before pressing the powder, the connecting ear (61) overlaps with the second connecting platform (81). During pressing, the pressing hammer assembly moves toward the pressing direction, causing the funnel bracket (7) and the weighing pan bracket (8) to move relative to each other. The first connecting platform (71) overlaps with the connecting ear (61), and the connecting ear (61) disengages from the second connecting platform (81).

2. The powder pressing device according to claim 1, characterized in that, It also includes a linkage mechanism, which includes a first linkage part that moves with the hammer assembly and a second linkage part that moves the funnel bracket (7). The second linkage part moves in the opposite direction with the first linkage part.

3. The powder pressing device according to claim 2, characterized in that, The linkage mechanism is a lever assembly, which includes a fulcrum, and the first linkage part and the second linkage part are located on both sides of the fulcrum. The pressure hammer assembly includes a pressure rod (41), and the funnel bracket (7) includes a lifting platform (72). When pressing powder, the pressure rod (41) presses against the first linkage part and moves in the direction of pressing powder. The second linkage part follows the first linkage part and moves in the opposite direction of pressing powder, thereby driving the lifting platform (72) to move.

4. The powder pressing device according to claim 3, characterized in that, The lever assembly includes a pivot (12) mounted on the bracket (13) and a rocker (11) rotatably sleeved on the pivot (12), with the first linkage part and the second linkage part formed at both ends of the rocker (11).

5. The powder pressing device according to claim 4, characterized in that, The end of the first linkage is provided with an upward-curving baffle (111).

6. The powder pressing device according to claim 1, characterized in that, The first connecting platform (71) is located at the lower part of the funnel bracket (7), and the funnel bracket (7) is provided with a clearance space (74) for the second connecting platform (81) to pass through.

7. The powder pressing device according to claim 1, characterized in that, The funnel bracket (7) is provided with a guide post (73), and the guide post (73) is fitted with a first elastic element (10). The two ends of the first elastic element (10) respectively abut against the bracket (13) and the funnel bracket (7).

8. The powder pressing device according to claim 1, characterized in that, One end of the weighing device (9) is connected to the weighing pan frame (8), and the other end of the weighing device (9) is connected to the support (13).

9. The powder pressing device according to claim 1, characterized in that, The weighing pan frame (8) includes a lower assembly ring (82), an upper assembly ring (83), and a support frame (84) located above the upper assembly ring (83). One end of the weighing device (9) is connected to the support frame (84), and the other end of the weighing device (9) is connected to the bracket (13).

10. A coffee machine, characterized in that, The powder pressing device includes any one of claims 1 to 9.

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