Hydraulic coffee machine

Abstract

A hydraulic coffee machine comprises a machine body, a grinding mechanism, a powder pressing device, a push-pull valve, a brewing assembly, a water tank, a water pump and a boiler assembly, the grinding mechanism, the powder pressing device and the brewing assembly are arranged on the machine body, the grinding mechanism, the powder pressing device and the brewing assembly are sequentially distributed up and down, a powder discharging channel and a powder pressing head moving up and down are arranged on the powder pressing device, and the front end of the push-pull valve abuts against the powder pressing device. The water tank, the water pump and the boiler assembly are sequentially connected, a sealing cavity and an extraction waterway are arranged in the powder pressing device, the water pump is connected with the push-pull valve, and the boiler assembly communicates with the extraction waterway. According to the hydraulic coffee machine, the compaction forming function and the steam pressurization extraction function of coffee powder are ingeniously related, so that the overall structure complexity of the coffee machine is simplified and optimized, relevance between execution elements in all preparation steps is enhanced, automation of the whole process from coffee bean grinding, coffee powder compaction forming to steam pressurization extraction is achieved, and the production efficiency is improved. The complexity of the machine is reduced while the preparation quality is ensured, and the production cost of the Italian coffee machine is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of coffee machines, and particularly to a hydraulic coffee machine. Background Art

[0002] With the continuous progress of social productivity, people's pursuit of quality of life is increasing day by day. Instant coffee can no longer meet consumers' higher demands for rich taste and complex flavors. Against this background, various coffee-making devices have emerged. Among them, Italian coffee machines using steam pressure rapid extraction technology are particularly eye-catching. Italian coffee machines, with their excellent extraction ability, can fully release the aroma and flavor of coffee beans, bringing an ultimate drinking experience to coffee lovers. Nowadays, fully automatic Italian coffee machines, with their efficient and convenient operation characteristics, have become an indispensable coffee preparation tool in modern families and commercial places, not only meeting people's pursuit of high-quality coffee but also reflecting the improvement of daily life quality brought by scientific and technological progress.

[0003] The preparation process of Italian coffee usually covers three key steps: first, finely grind coffee beans into coffee powder, then evenly compact the coffee powder to form a coffee cake, and finally extract caffeine from the coffee cake through steam pressure. Currently, Italian coffee machines that can integrate these three operations into one have emerged on the market. Although these machines have achieved relative independence of the components for each step in design, ensuring high precision and stability in the preparation process, the high integration complexity has also brought structural cumbersome and a significant increase in manufacturing costs.

[0004] Therefore, it is necessary to make further improvements. Summary of the Invention

[0005] The purpose of the present invention is to provide a hydraulic coffee machine with simple structure, full-process automation, low production cost, good user experience, and strong practicability, so as to overcome the deficiencies of the prior art.

[0006] A hydraulic coffee machine designed for this purpose includes a machine body, and is characterized in that: it further includes a grinding mechanism, a powder pressing device, a push-pull valve, a brewing assembly, a water tank, a water pump and a boiler assembly arranged on the machine body. The grinding mechanism, the powder pressing device and the brewing assembly are distributed vertically in sequence. The powder pressing device is provided with a powder feeding channel and a vertically movable powder pressing head. The front end of the push-pull valve abuts against the powder pressing device. The water tank, the water pump and the boiler assembly are connected in sequence. A sealed cavity and an extraction water path are arranged in the powder pressing device. The water pump is connected to the push-pull valve, and the boiler assembly communicates with the extraction water path. When the powder pressing device is in a pending state, the grinding mechanism, the powder feeding channel and the brewing assembly are communicated in sequence. Under the action of water pressure, the push-pull valve pushes the powder pressing device forward to the position directly above the brewing assembly, and the water pump, the push-pull valve and the sealed cavity are communicated in sequence. When water enters the sealed cavity, the water pressure pushes the powder pressing head downward, so that the lower part of the powder pressing head enters the brewing assembly, and a closed extraction cavity is formed between the powder pressing head and the brewing assembly. The extraction water path communicates with the extraction cavity. When the powder pressing head moves downward to the maximum position, the channel of the push-pull valve is blocked by water, and the water pump communicates with the boiler assembly.

[0007] It further includes a pressure relief valve. The push-pull valve, the pressure relief valve and the water tank are connected in sequence. When the pressure relief valve is opened, the sealed cavity, the push-pull valve, the pressure relief valve and the water tank are communicated in sequence, the pressure relief port channel of the push-pull valve is opened, and the powder pressing head moves upward to reset.

[0008] The push-pull valve includes a valve body and a hydraulic push rod. A water passing cavity is arranged in the valve body. The valve body is provided with a first water inlet, a water outlet and a pressure relief port respectively communicating with the water passing cavity. The hydraulic push rod is movably arranged back and forth on the water passing cavity. The first water inlet is connected to the water pump, the water outlet communicates with the sealed cavity, the pressure relief port is connected to the pressure relief valve, and the front end of the hydraulic push rod abuts against the powder pressing device. When the hydraulic push rod is in a pending state, the first water inlet and the water outlet are not communicated with each other. Under the action of water pressure, the hydraulic push rod moves forward and pushes the powder pressing device forward to the position directly above the brewing assembly, and the first water inlet, the water passing cavity and the water outlet are communicated in sequence. The first water inlet, the water passing cavity and the water outlet together form the channel of the push-pull valve.

[0009] The powder pressing device includes a powder pressing head, a piston, a sliding bracket and a first elastic member. The sliding bracket is slidably arranged back and forth on the machine body. The piston is fixed on the sliding bracket. The powder pressing head is movably arranged up and down on the sliding bracket. The first elastic member is arranged between the top of the powder pressing head and the bottom of the piston. A sealed cavity is formed between the bottom of the powder pressing head and the bottom of the piston. When the powder pressing head moves downward, the volume of the sealed cavity increases. When the pressure relief valve is opened, the sealed cavity is opened, and the powder pressing head moves upward to reset under the elastic force of the first elastic member.

[0010] On the outer sides of both sides of the powder pressing head, a second water inlet and a third water inlet are respectively arranged. On the inner sides of both sides of the powder pressing head, a first water inlet channel and a second water inlet channel are respectively arranged. At the bottom of the powder pressing head, a water outlet hole is arranged. The water outlet, the second water inlet, the first water inlet channel and the sealing cavity are communicated in sequence. The third water inlet, the second water inlet channel and the water outlet hole form an extraction water path. The boiler assembly, the third water inlet, the second water inlet channel, the water outlet hole and the extraction cavity are communicated in sequence.

[0011] The boiler assembly includes a boiler, a pressure valve and a water inlet valve. The pressure valve and the water inlet valve are respectively arranged on both sides of the boiler. The pressure valve is connected to a water pump, and the water inlet valve is connected to the third water inlet. When the powder pressing head moves downward to the maximum position, the channel of the push-pull valve is blocked by water, so that the water flow output by the water pump flows to the pressure valve, and the pressure valve is opened under the water pressure, so that the water pump, the pressure valve, the boiler, the water inlet valve and the third water inlet are communicated in sequence.

[0012] The grinding mechanism includes an upper cutter head and a lower cutter head that are relatively rotatably arranged. A grinding gap is arranged between the upper cutter head and the lower cutter head. At the bottom of the grinding mechanism, a powder outlet is arranged. The grinding gap communicates with the powder outlet. When the powder pressing device is in a pending state, the powder outlet communicates with the lower powder channel. At the top of the grinding mechanism, a bean pouring port is arranged, and the bean pouring port communicates with the grinding gap.

[0013] The brewing assembly includes a brewing cylinder and a fixing frame. The fixing frame is fixed on the machine body. The brewing cylinder is slidably arranged on the fixing frame in a front-back sliding manner. When the powder pressing head moves downward, its lower part enters the brewing cylinder, so as to form a closed extraction cavity between the powder pressing head and the brewing cylinder.

[0014] A second elastic member is arranged between the sliding bracket and the machine body. When the powder pressing device moves forward, the second elastic member is stretched. After the water in the sealing cavity and the water passing cavity is discharged, the powder pressing device moves backward to the pending state under the elastic force of the second elastic member and pushes the hydraulic push rod to move backward to the pending state.

[0015] A pressure relief channel is arranged at the top of the pressure valve. The pressure relief channel is connected to the water pump. When the pressure in the pipeline is too high, the pressure relief channel is conducted, and the pressure valve, the pressure relief channel and the water pump are communicated in sequence.

[0016] The hydraulic coffee machine of the present invention fills water into the sealed cavity through a push-pull valve, enabling the powder pressing device to move forward to directly above the brewing assembly and the powder pressing head to move downward into the brewing assembly to compact the coffee powder. When the powder pressing head moves downward to the maximum position, the channel of the push-pull valve is blocked by water, and then all the pressure generated by the water pump acts on the boiler assembly, causing the pressure valve to open. The water pump, boiler assembly, extraction waterway, and extraction cavity are connected in sequence, and steam enters the extraction cavity to efficiently extract the coffee cake. The above structure cleverly relates the coffee powder compaction and shaping function to the steam pressurization extraction function through the hydraulic pressure generated by the water pump, thereby streamlining and optimizing the overall structural complexity of the coffee machine, enhancing the correlation between the actuators of each preparation step, achieving full-process automation from coffee bean grinding, coffee powder compaction and shaping to steam pressurization extraction, reducing the complexity of the machine while ensuring the preparation quality, and effectively reducing the production cost of the Italian coffee machine. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of the hydraulic coffee machine in an embodiment of the present invention.

[0018] Figure 2 It is a schematic diagram of a partial structure of the hydraulic coffee machine in an embodiment of the present invention.

[0019] Figure 3 It is a cross-sectional view of the hydraulic coffee machine when the powder pressing device has moved forward and the powder pressing head has not moved downward in an embodiment of the present invention.

[0020] Figure 4 It is Figure 3 an enlarged schematic diagram of the structure at A in

[0021] Figure 5 It is a cross-sectional view of the hydraulic coffee machine when the powder pressing device is in a pending state in an embodiment of the present invention.

[0022] Figure 6 It is a cross-sectional view of the hydraulic coffee machine when the powder pressing device has moved forward and the powder pressing head has moved downward in an embodiment of the present invention.

[0023] Figure 7 It is a cross-sectional view of the push-pull valve when the hydraulic push rod is in a pending state in an embodiment of the present invention.

[0024] Figure 8 It is a cross-sectional view of the push-pull valve when the hydraulic push rod has moved forward in an embodiment of the present invention.

[0025] Figure 9 It is a partial structural cross-sectional view of the powder pressing device after the powder pressing head has moved downward in an embodiment of the present invention.

[0026] Figure 10 It is a schematic diagram of the overall structure of the powder pressing device in an embodiment of the present invention.

[0027] Figure 11 This is a schematic diagram of the overall structure of the boiler assembly in an embodiment of the present invention.

[0028] Figure 12 This is a partial structure schematic diagram of another orientation of the hydraulic coffee machine in an embodiment of the present invention.

[0029] Figure 13 This is the water circuit diagram of the hydraulic coffee machine in an embodiment of the present invention. Specific embodiments

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] See Figures 1 - 13 , this Italian hydraulic coffee machine includes a machine body, a grinding mechanism 2, a powder pressing device 3, a push-pull valve 4, a brewing assembly 5, a water tank 6, a water pump 7 and a boiler assembly 8 arranged on the machine body 1. The grinding mechanism 2, the powder pressing device 3 and the brewing assembly 5 are distributed vertically in sequence. A powder feeding channel 11 and a vertically movable powder pressing head 12 are arranged on the powder pressing device 3. The front end of the push-pull valve 4 abuts against the powder pressing device 3. The water tank 6, the water pump 7 and the boiler assembly 8 are connected in sequence. A sealed cavity 9 and an extraction water circuit are arranged in the powder pressing device 3. The water pump 7 is connected to the push-pull valve 4, and the boiler assembly 8 communicates with the extraction water circuit; when the powder pressing device 3 is in a waiting state, the grinding mechanism 2, the powder feeding channel 11 and the brewing assembly 5 are communicated in sequence; under the action of water pressure, the push-pull valve 4 pushes the powder pressing device 3 forward to the position directly above the brewing assembly 5, and the water pump 7, the push-pull valve 4 and the sealed cavity 9 are communicated in sequence. When water enters the sealed cavity 9, the water pressure pushes the powder pressing head 12 downward, so that the lower part of the powder pressing head 12 enters the brewing assembly 5, and a closed extraction cavity 10 is formed between the powder pressing head 12 and the brewing assembly 5. The extraction water circuit communicates with the extraction cavity 10. When the powder pressing head 12 moves downward to the maximum position, the channel of the push-pull valve 4 is blocked by water, and the water pump 7 communicates with the boiler assembly 8.

[0032] It further includes a pressure relief valve 13. The push-pull valve 4, the pressure relief valve 13 and the water tank 6 are connected in sequence. When the pressure relief valve 13 is opened, the sealed cavity 9, the push-pull valve 4, the pressure relief valve 13 and the water tank 6 are communicated in sequence, and the powder pressing head 12 moves upward to reset.

[0033] The push-pull valve 4 includes a valve body 14 and a hydraulic push rod 15. A water passage chamber 19 is provided inside the valve body 14. A first water inlet 16, a water outlet 17, and a pressure relief port 18 that are respectively communicated with the water passage chamber 19 are provided on the valve body 14. The hydraulic push rod 15 is movably arranged back and forth on the water passage chamber 19. The first water inlet 16 is connected to the water pump 7, the water outlet 17 is communicated with the sealing cavity 9, and the pressure relief port 18 is connected to the pressure relief valve 13. The front end of the hydraulic push rod 15 abuts against the powder pressing device 3. When the hydraulic push rod 15 is in the standby state, the first water inlet 16 and the water outlet 17 are not communicated with each other. When the hydraulic push rod 15 moves forward under the action of water pressure and pushes the powder pressing device 3 to move forward to directly above the brewing assembly 5, the first water inlet 16, the water passage chamber 19, and the water outlet 17 are communicated in sequence. The first water inlet 16, the water passage chamber 19, and the water outlet 17 together form the passage of the push-pull valve 4.

[0034] A check valve 40 is provided on the first water inlet 16. The check valve 40 can prevent water from flowing back from the push-pull valve 4 to the water pump 7. A closing portion 41 is provided on the hydraulic push rod 15. After the hydraulic push rod 15 moves backward, the closing portion 41 is located at the position between the first water inlet 16 and the water outlet 17, and thus the first water inlet 16 and the water outlet 17 are not communicated with each other. After the hydraulic push rod 15 moves forward, the closing portion 41 is not located at the position between the first water inlet 16 and the water outlet 17, and thus the first water inlet 16, the water passage chamber 19, and the water outlet 17 are communicated in sequence.

[0035] The powder pressing device 3 includes a powder pressing head 12, a piston 20, a sliding bracket 21, and a first elastic member 22. The first elastic member 22 is a spring. The sliding bracket 21 is slidably arranged back and forth on the machine body 1. The piston 20 is fixed on the sliding bracket 21. The powder pressing head 12 is movably arranged up and down on the sliding bracket 21. The first elastic member 22 is arranged between the top of the powder pressing head 12 and the bottom of the piston 20. A sealing cavity 9 is formed between the bottom of the powder pressing head 12 and the bottom of the piston 20. When the powder pressing head 12 moves downward, the volume of the sealing cavity 9 increases. When the pressure relief valve 13 is opened, the sealing cavity 9 is opened, and the powder pressing head 12 moves upward to reset under the elastic force of the first elastic member 22. Specifically, when the pressure relief valve 13 is opened, the water in the sealing cavity 9 and the water passage chamber 19 flows back into the water tank 6 through the pressure relief valve 13, and the powder pressing head 12 moves upward to reset under the elastic force of the first elastic member 22 without the action of water pressure, so that the lower pressing end 43 moves out of the brewing cylinder 36.

[0036] Sliding edges 47 are respectively provided on both sides of the sliding bracket 21. Guide rails 42 are provided on the machine body 1. The sliding bracket 21 is slidably arranged back and forth on the guide rails 42 through the sliding edges 47. A lower pressing end 43 is provided at the lower part of the powder pressing head 12. When water pressure is applied when the sealing cavity 9 is filled with water, the powder pressing head 12 moves downward so that the lower pressing end 43 enters the brewing assembly 5. The lower pressing end 43 and the brewing assembly 5 together form a closed extraction cavity 10. The lower pressing end 43 is used to compact the coffee powder.

[0037] A second water inlet 23 and a third water inlet 24 are respectively provided on both sides of the outside of the pressed powder head 12, a first water inlet channel 25 and a second water inlet channel 26 are respectively provided on both sides of the inside of the pressed powder head 12, a water outlet hole 27 is provided at the bottom of the pressed powder head 12, the water outlet 17, the second water inlet 23, the first water inlet channel 25 and the sealed cavity 9 are connected in sequence, when the first water inlet 16 and the water outlet 17 are connected, the water in the water cavity 19 enters the sealed cavity 9 through the water outlet 17, the second water inlet 23 and the first water inlet channel 25 in sequence, the third water inlet 24, the second water inlet channel 26 and the water outlet hole 27 form an extraction water path, and the boiler assembly 8, the third water inlet 24, the second water inlet channel 26, the water outlet hole 27 and the extraction cavity 10 are connected in sequence.

[0038] The boiler assembly 8 includes a boiler 28, a pressure valve 29 and a water inlet valve 30, which are respectively arranged on both sides of the boiler 28, the pressure valve 29 is connected to the water pump 7, and the water inlet valve 30 is connected to the third water inlet 24; when the powder pressing head 12 moves downward to the maximum position, the channel of the push-pull valve 4 is closed by water, and the water output by the water pump 7 flows to the pressure valve 29, and the water flow pressure supplied by the water pump 7 gradually accumulates until it breaks through the restriction of the pressure valve 29, so that the pressure valve 29 is opened under the water flow pressure, and then the water pump 7, the pressure valve 29, the boiler 28, the water inlet valve 30 and the third water inlet 24 are connected in sequence. After the pressure valve 29 is opened, the water supplied by the water pump 7 enters the boiler 28 for heating, and the water flow heated by the boiler 28 is converted into high-temperature and high-pressure water vapor, and then the water vapor enters the extraction chamber 10 through the water inlet valve 30, the third water inlet 24, the second water inlet channel 26 and the water outlet 27 in sequence, so as to efficiently extract the coffee cake, thereby releasing caffeine.

[0039] The grinding mechanism 2 includes an upper cutter disc 31 and a lower cutter disc 32 which are arranged to rotate relative to each other, a grinding gap 33 is arranged between the upper cutter disc 31 and the lower cutter disc 32, a powder outlet 34 is arranged at the bottom of the grinding mechanism 2, and the grinding gap 33 is connected to the powder outlet 34; when the powder pressing device 3 is in a pending state, the powder outlet 34 is connected to the lower powder channel 11; a bean pouring port 35 is arranged at the top of the grinding mechanism 2, and the bean pouring port 35 is connected to the grinding gap 33; the grinding mechanism 2 also includes a motor 44 and a synchronous belt assembly 46, the motor 44 is connected to the lower cutter disc 32 through the synchronous belt assembly 46, and when the upper cutter disc 31 and the lower cutter disc 32 rotate relative to each other, the coffee beans are ground through the grinding gap 33 to grind the coffee beans into coffee powder.

[0040] The brewing assembly 5 includes a brewing cylinder 36 and a fixing frame 37. The fixing frame 37 is fixed on the machine body 1. The brewing cylinder 36 is slidably drawn forward and backward on the fixing frame 37, so that the brewing cylinder 36 can be pulled out of the fixing frame 37 forward or pushed into the fixing frame 37 backward to realize the disassembly and assembly of the brewing cylinder 36. When the powder pressing head 12 moves downward, the pressing end 43 enters the brewing cylinder 36 to form a closed extraction chamber 10 between the pressing end 43 and the brewing cylinder 36.

[0041] A second elastic member 38 is arranged between the sliding bracket 21 and the body 1. The second elastic member 38 is a tension spring. When the powder pressing device 3 moves forward, the second elastic member 38 is stretched. After the water in the sealing cavity 9 and the water passage cavity 19 is discharged, since the hydraulic push rod 15 has no water pressure, the powder pressing device 3 moves backward and resets to the pending state under the pulling force of the second elastic member 38, and pushes the hydraulic push rod 15 to move backward and reset to the pending state.

[0042] A pressure relief channel 39 is provided on the top of the pressure valve 29, and the pressure relief channel 39 is connected to the water pump 7. When the pressure in the pipeline is too high, the pressure relief channel 39 is opened, and the pressure valve 29, the pressure relief channel 39 and the water pump 7 are connected in sequence. Part of the water in the pipeline can flow back to the water pump 7 through the pressure relief channel 39 and recirculate to reduce the pipeline pressure.

[0043] When the powder pressing device 3 is in the waiting state, the powder outlet 34, the lower powder channel 11 and the brewing cylinder 36 are connected in sequence. The lower powder channel 11 is located in front of the powder pressing head 12, which can guide the coffee powder to flow to the brewing cylinder 36 to prevent dust from flying during the grinding process.

[0044] A flow meter 45 is also provided on the machine body 1, and the water tank 6, the flow meter 45 and the water pump 7 are connected in sequence.

[0045] Working principle of this hydraulic coffee machine: Fill the water tank 6 with water, and then pour coffee beans through the bean pouring port 35. The coffee beans fall into the grinding gap 33, and the grinding mechanism 2 grinds the coffee beans into coffee powder. During the grinding process, the powder outlet 34 is precisely configured above the brewing cylinder 36, and the ground coffee powder directly falls into the brewing cylinder 36 through the powder lowering channel 11. When a proper amount of coffee powder is accumulated in the brewing cylinder 36, the system starts the water pump 7 to pump water from the water tank 6 into the push-pull valve 4 (water passage chamber 19). The hydraulic push rod 15 inside the push-pull valve 4 responds to the pressure change and moves to drive the powder pressing device 3 (powder pressing head 1 2) Move to the top of the brewing cylinder 36. At this time, the push-pull valve 4 establishes a fluid connection between the water pump 7 and the tamping head 12. The water supplied by the water pump 7 is injected into the sealed cavity 9. As the water is injected, the volume of the sealed cavity 9 expands. Under the action of the water flow pressure, the tamping head 12 moves downward. The downward pressing end 43 of the tamping head 12 penetrates into the brewing cylinder 36. The downward pressing end 43 tightly compacts the coffee powder in the brewing cylinder 36, and the downward pressing end 43 and the brewing cylinder 36 together form a closed environment (i.e., the extraction chamber 10). When the coffee powder is compacted to form a coffee cake and the closed environment is stably established. Afterwards, since the powder pressing head 12 moves downward to the maximum position, the volume of the sealed cavity 9 reaches the limit state, which means that the channel of the push-pull valve 4 is closed by water. At this time, the water pump 7 continues to operate, and all the pressure generated by the water pump 7 acts on the boiler assembly 8, that is, the water output by the water pump 7 flows to the pressure valve 29. The water flow pressure supplied by the water pump 7 gradually accumulates until it breaks through the limit of the pressure valve 29, so that the pressure valve 29 is opened, and the water enters the boiler 28 for heating. The water flow heated by the boiler 28 is converted into high-temperature and high-pressure water vapor, which is injected into the extraction chamber 10 through the extraction water path. The coffee cake is efficiently extracted to release caffeine and other flavor components; after the coffee is prepared, the pressure relief valve 13 is opened, so that the sealed cavity 9 is opened, and the water in the sealed cavity 9 and the water passage cavity 19 flows back into the water tank 6 through the pressure relief valve 13, and the powder pressing head 12 moves upward and resets by the elastic force of the first elastic member 22 without the action of water pressure, so that the lower pressing end 43 moves out of the brewing cylinder 36, and then the powder pressing device 3 moves backward and resets to the waiting state under the pulling force of the second elastic member 38, and pushes the hydraulic push rod 15 to move backward and reset to the waiting state.

[0046] The above is a preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for illustrating the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A hydraulic coffee machine, comprising a machine body (1), characterized in that: The machine also comprises a grinding mechanism (2), a powder pressing device (3), a push-pull valve (4), a brewing component (5), a water tank (6), a water pump (7) and a boiler component (8) arranged on the machine body (1); the grinding mechanism (2), the powder pressing device (3) and the brewing component (5) are arranged in sequence up and down; the powder pressing device (3) is provided with a powder lowering channel (11) and a powder pressing head (12) movable up and down; the front end of the push-pull valve (4) abuts against the powder pressing device (3); the water tank (6), the water pump (7) and the boiler component (8) are connected in sequence; a sealed cavity (9) and an extraction water path are arranged in the powder pressing device (3); the water pump (7) is connected to the push-pull valve (4); and the boiler component (8) is connected to the extraction water path; when the powder pressing device (3) is in a waiting state, The grinding mechanism (2), the powder lowering channel (11) and the brewing component (5) are connected in sequence; the push-pull valve (4) pushes the powder pressing device (3) to move forward to the top of the brewing component (5) under the action of water pressure, and the water pump (7), the push-pull valve (4) and the sealing cavity (9) are connected in sequence; when water enters the sealing cavity (9), the water pressure pushes the powder pressing head (12) to move downward, so that the lower part of the powder pressing head (12) enters the brewing component (5), and a closed extraction chamber (10) is formed between the powder pressing head (12) and the brewing component (5); the extraction water channel is connected to the extraction chamber (10); when the powder pressing head (12) moves downward to the maximum position, the channel of the push-pull valve (4) is closed by water, and the water pump (7) is connected to the boiler component (8).

2. The hydraulic coffee machine according to claim 1, characterized in that: It also includes a pressure relief valve (13), the push-pull valve (4), the pressure relief valve (13) and the water tank (6) are connected in sequence, and when the pressure relief valve (13) is opened, the sealed cavity (9), the push-pull valve (4), the pressure relief valve (13) and the water tank (6) are connected in sequence, and the powder pressing head (12) moves upward to reset.

3. The hydraulic coffee machine according to claim 2, characterized in that: The push-pull valve (4) comprises a valve body (14) and a hydraulic push rod (15). A water passage cavity (19) is provided in the valve body (14). A first water inlet (16), a water outlet (17) and a pressure relief port (18) which are respectively connected to the water passage cavity (19) are provided on the valve body (14). The hydraulic push rod (15) is movably arranged on the water passage cavity (19) in a forward and backward manner. The first water inlet (16) is connected to a water pump (7), the water outlet (17) is connected to a sealing cavity (9), the pressure relief port (18) is connected to a pressure relief valve (13), and the hydraulic push rod ( The front end of the hydraulic push rod (15) abuts against the powder pressing device (3); when the hydraulic push rod (15) is in a waiting state, the first water inlet (16) and the water outlet (17) are not connected to each other; the hydraulic push rod (15) moves forward under the action of water pressure and pushes the powder pressing device (3) forward to the top of the brewing component (5), and the first water inlet (16), the water passage cavity (19) and the water outlet (17) are connected in sequence; the first water inlet (16), the water passage cavity (19) and the water outlet (17) together form a passage of the push-pull valve (4).

4. The hydraulic coffee machine according to claim 3, characterized in that: The powder pressing device (3) comprises a powder pressing head (12), a piston (20), a sliding bracket (21) and a first elastic member (22); the sliding bracket (21) is slidably arranged on the machine body (1) in a forward and backward manner; the piston (20) is fixed on the sliding bracket (21); the powder pressing head (12) is movably arranged on the sliding bracket (21) in a forward and backward manner; the first elastic member (22) is arranged between the top of the powder pressing head (12) and the bottom of the piston (20); a sealed cavity (9) is formed between the bottom of the powder pressing head (12) and the bottom of the piston (20); when the powder pressing head (12) moves downward, the volume of the sealed cavity (9) increases; when the pressure relief valve (13) is opened, the sealed cavity (9) is opened, and the powder pressing head (12) moves upward and resets under the elastic force of the first elastic member (22).

5. The hydraulic coffee machine according to claim 4, characterized in that: A second water inlet (23) and a third water inlet (24) are respectively arranged on both sides of the outside of the pressed powder head (12); a first water inlet channel (25) and a second water inlet channel (26) are respectively arranged on both sides of the inside of the pressed powder head (12); a water outlet (27) is arranged at the bottom of the pressed powder head (12); the water outlet (17), the second water inlet (23), the first water inlet channel (25) and the sealed cavity (9) are sequentially connected; the third water inlet (24), the second water inlet channel (26) and the water outlet (27) form an extraction water path; the boiler assembly (8), the third water inlet (24), the second water inlet channel (26), the water outlet (27) and the extraction cavity (10) are sequentially connected.

6. The hydraulic coffee machine according to claim 5, characterized in that: The boiler assembly (8) comprises a boiler (28), a pressure valve (29) and a water inlet valve (30), wherein the pressure valve (29) and the water inlet valve (30) are respectively arranged on both sides of the boiler (28), the pressure valve (29) is connected to the water pump (7), and the water inlet valve (30) is connected to the third water inlet (24); when the powder pressing head (12) moves downward to the maximum position, the passage of the push-pull valve (4) is closed by water, so that the water output by the water pump (7) flows to the pressure valve (29), and the pressure valve (29) is opened under the pressure of the water flow, so that the water pump (7), the pressure valve (29), the boiler (28), the water inlet valve (30) and the third water inlet (24) are connected in sequence.

7. The hydraulic coffee machine according to claim 1, characterized in that: The grinding mechanism (2) comprises an upper blade disc (31) and a lower blade disc (32) which are arranged to rotate relative to each other; a grinding gap (33) is provided between the upper blade disc (31) and the lower blade disc (32); a powder outlet (34) is provided at the bottom of the grinding mechanism (2); and the grinding gap (33) is connected to the powder outlet (34); when the powder pressing device (3) is in a waiting state, the powder outlet (34) is connected to the lower powder channel (11); and a bean pouring port (35) is provided at the top of the grinding mechanism (2); and the bean pouring port (35) is connected to the grinding gap (33).

8. The hydraulic coffee machine according to claim 1, characterized in that: The brewing assembly (5) comprises a brewing cylinder (36) and a fixing frame (37), wherein the fixing frame (37) is fixed to the machine body (1), and the brewing cylinder (36) is arranged on the fixing frame (37) to slide forward and backward, and when the pressed powder head (12) moves downward, its lower part enters the brewing cylinder (36), so that a closed extraction chamber (10) is formed between the pressed powder head (12) and the brewing cylinder (36).

9. The hydraulic coffee machine according to claim 4, characterized in that: A second elastic member (38) is provided between the sliding bracket (21) and the machine body (1). When the powder pressing device (3) moves forward, the second elastic member (38) is stretched, and after the water in the sealing cavity (9) and the water passage cavity (19) is discharged, the powder pressing device (3) moves backward under the elastic force of the second elastic member (38) to reset to a standby state, and pushes the hydraulic push rod (15) to move backward to reset to a standby state.

10. The hydraulic coffee machine according to claim 6, characterized in that: A pressure relief channel (39) is provided at the top of the pressure valve (29), and the pressure relief channel (39) is connected to the water pump (7). When the pressure in the pipeline is too high, the pressure relief channel (39) is opened, and the pressure valve (29), the pressure relief channel (39) and the water pump (7) are connected in sequence.

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