A piercing device and coffee machine using the same

Abstract

The utility model discloses a kind of puncture device and coffee machine applied thereto, including gas cylinder positioning mechanism, two-axis drive mechanism and puncture mechanism, gas cylinder positioning mechanism includes with the installation slot of gas cylinder limit cooperation, two-axis drive mechanism is used to drive gas cylinder lifting and translation, puncture mechanism is cooperated with gas cylinder and is used to puncture gas cylinder;Two-axis drive mechanism includes lifting drive component and horizontal drive component, lifting drive component is connected with gas cylinder positioning mechanism, for driving gas cylinder lifting along height direction, horizontal drive component is cooperated with gas cylinder, for driving gas cylinder translation along horizontal direction.The utility model provides a kind of brand-new structure's puncture device, the puncture device has realized the automation of gas cylinder puncture action, replaced the operation of traditional manual screw gas cylinder and punctured, avoid the defect of manual operation, with operation portable, gas cylinder is replaced conveniently, puncture efficiency is high, safety is high, gas leakage is less and many advantages such as.

Description

Technical Field

[0001] This utility model relates to the field of daily necessities technology, and in particular to a puncture device and a coffee machine using the same. Background Technology

[0002] Currently, coffee machines on the market are mainly divided into two categories based on their pressurization principle: active pressurization and passive pressurization. Different principles directly affect the coffee extraction effect and applicable scenarios.

[0003] Active pressure coffee machines are mainly divided into the following types: 1. Pump-pressurized (high-pressure extraction): The principle is to actively apply pressure through an electric pump or piston device, forcing hot water to quickly pass through the coffee grounds layer. Examples include semi-automatic / fully automatic espresso machines and capsule coffee machines; 2. Manual pneumatic type: The principle is to generate pressure through manual operation (such as piston pressing down or steam expansion). A representative model is the Moka pot; 3. Steam type: The principle is to use the expansion of high-temperature steam to generate pressure. A representative model is the steam coffee machine.

[0004] Passive pressure coffee machines are mainly divided into the following types: 1. Drip coffee (gravity driven): The principle is that hot water naturally permeates the coffee grounds by gravity. 2. Siphon coffee (vacuum principle): The principle is that the water is heated at the bottom, causing it to expand and rise. After mixing with the coffee grounds, it cools and forms a vacuum, causing the liquid to fall back down. 3. French press (immersion + filtration): The principle is that the coffee grounds are steeped and then filtered through a filter.

[0005] The aforementioned active pressurized coffee machines have the disadvantage of being large in size, while passive pressurized coffee machines have the disadvantage of not being able to pressurize and bring out the aroma of coffee. A portable coffee machine with a gas cartridge has appeared on the market. Its principle is to release high-pressure gas from a gas cylinder to push hot water through coffee grounds. It does not require the use of a pump or piston device, so it has the advantage of being small in size. At the same time, it can provide the gas pressure required for extraction and can extract the aroma of coffee.

[0006] However, the gas cylinders used in the aforementioned coffee machines require puncturing the opening to release gas. The existing puncturing method is generally achieved by manually rotating the gas cylinder, which means that the puncture is performed during the installation of the gas cylinder. This has problems such as cumbersome manual operation and the risk of gas leakage if the operation is not done properly. Utility Model Content

[0007] The purpose of this invention is to provide a puncture device that can at least solve one of the above-mentioned problems.

[0008] According to one aspect of the present invention, a puncture device is provided, including a gas cylinder positioning mechanism, a two-axis drive mechanism and a puncture mechanism. The gas cylinder positioning mechanism includes a mounting groove that cooperates with the gas cylinder for positioning. The two-axis drive mechanism is used to drive the gas cylinder to move up and down and to translate. The puncture mechanism cooperates with the gas cylinder and is used to puncture the gas cylinder.

[0009] The two-axis drive mechanism includes a lifting drive assembly and a horizontal drive assembly. The lifting drive assembly is connected to the gas cylinder positioning mechanism and is used to drive the gas cylinder to move up and down in the height direction. The horizontal drive assembly cooperates with the gas cylinder and is used to drive the gas cylinder to move horizontally.

[0010] In some embodiments, the puncture device further includes a mounting frame, and the lifting drive assembly includes a first drive member, a first transmission module, a guide module, and a movable frame. The movable frame is movably mounted on the mounting frame via the guide module. The first drive member is mounted on the mounting frame and is driven by the first transmission module. The first transmission module is connected to the movable frame, and the movable frame is connected to the gas cylinder positioning mechanism.

[0011] In some embodiments, the first transmission module includes a first screw and a nut, the first screw being connected to the drive end of the first drive member, and the nut being fitted around the outer periphery of the first screw and connected to the movable frame.

[0012] In some embodiments, the lifting drive assembly further includes an elastic buffer module, which includes a connector and a first spring. The nut is connected to the movable frame via the connector, and the first spring is fitted around the outer periphery of the connector and located between the nut and the movable frame.

[0013] In some embodiments, the gas cylinder positioning mechanism includes an outer bracket and an inner bracket. The outer bracket has a cavity and is connected to the puncture mechanism and the horizontal drive assembly, respectively. The inner bracket is fitted inside the outer bracket and its bottom is connected to the movable frame. The top of the inner bracket has a first contour groove that cooperates with the gas cylinder limit. The first contour groove and the outer bracket together form an installation groove.

[0014] In some embodiments, the inner bracket includes a top block, a base, a second spring, and a guide pin. The top block is movably mounted above the base and guided by the guide pin. A first limiting groove is provided at the bottom of the top block, and the second spring is installed in the first limiting groove and abuts against the top block and the base respectively.

[0015] In some embodiments, the horizontal drive assembly includes a second drive member, a second transmission module, and a top cylinder. The second drive member is connected to the second transmission module, the second transmission module is connected to the top cylinder, and the top cylinder cooperates with the gas cylinder.

[0016] In some embodiments, the horizontal drive assembly further includes a first mounting base connected to an outer bracket, and a second transmission module including a first bevel gear, a second bevel gear, and a second screw. The first bevel gear is connected to the drive end of the second drive member, the second bevel gear meshes with the first bevel gear, the second screw is fitted onto the second bevel gear, and both the first and second bevel gears are mounted on the first mounting base. The top cylinder is movably fitted onto the outer periphery of the second screw and slides in cooperation with the first mounting base.

[0017] In some embodiments, the top cylinder has a second contour groove that matches the tail end of the gas cylinder, and the bottom of the second contour groove is provided with a magnetic suction element that matches the gas cylinder.

[0018] In some embodiments, the puncture device further includes a first sensing mechanism and a second sensing mechanism. The first sensing mechanism includes a first sensor mounted on a mounting frame and a first sensing element mounted on a movable frame and cooperating with the first sensor. The second sensing mechanism includes a second sensor mounted on a mounting frame and a second sensing element mounted on a top cylinder and cooperating with the second sensor.

[0019] In some embodiments, the puncture mechanism includes a second mounting base, a puncture needle, and an output tube. The second mounting base has a through hole that matches the mouth of the gas cylinder. The puncture needle is installed in the second mounting base with its head extending into the through hole. One end of the output tube extends into the second mounting base, and the center of the puncture needle has a gas passage that communicates with the output tube.

[0020] According to another aspect of the present invention, a coffee machine is also provided, including a water tank, a coffee powder bowl, an air passage system, a gas cylinder puncture device, and a gas cylinder. The coffee powder bowl is disposed at the bottom of the water tank and is used to hold coffee powder. The gas cylinder puncture device cooperates with the gas cylinder to puncture the gas cylinder and connect the gas cylinder and the air passage system. The gas outlet of the air passage system is connected to the water tank. The gas cylinder puncture device is the aforementioned puncture device.

[0021] The beneficial effects of this utility model are:

[0022] This utility model provides a novel puncture device that automates the puncture of gas cylinders, replacing the traditional manual operation of twisting the cylinder. This avoids the drawbacks of manual operation and offers numerous advantages such as portability, easy cylinder replacement, high puncture efficiency, high safety, and minimal gas leakage. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present utility model;

[0024] Figure 2 for Figure 1 The diagram shown is a three-dimensional structure with the gas cylinder omitted.

[0025] Figure 3 for Figure 2 The diagram shows a top view of the structure.

[0026] Figure 4 for Figure 3 The schematic diagram of the cross-sectional structure along the AA direction is shown.

[0027] Figure 5 for Figure 4The enlarged structural diagram at point B is shown below;

[0028] Figure 6 for Figure 2 One of the three-dimensional structural diagrams of the partial structure shown;

[0029] Figure 7 for Figure 2 The second schematic diagram of the three-dimensional structure shown;

[0030] Figure 8 This is an exploded structural diagram of the gas cylinder positioning mechanism of this utility model;

[0031] Figure 9 This is a three-dimensional structural diagram of Embodiment 2 of the present invention.

[0032] Figures 1-9 Reference numerals in the attached drawings: 100-Water tank; 200-Coffee powder holder; 300-Gas system; 400-Gas cylinder puncture device; 500-Gas cylinder; 300a-Inlet pipe; 1-Gas cylinder positioning mechanism; 2-Two-axis drive mechanism; 3-Punching mechanism; 4-Mounting bracket; 5-First sensing mechanism; 6-Second sensing mechanism; 10-Mounting slot; 11-Outer bracket; 12-Inner bracket; 21-Lifting drive assembly; 22-Horizontal drive assembly; 31-Second mounting base; 32-Punching needle; 33-Outlet pipe; 51-First sensor; 52-First sensing element; 61-Second sensor; 62-Second sensing element; 121-Top block; 122-Base; 123-Second spring; 124-Guide pin; 21 1-First driving component; 212-First transmission module; 213-Guide module; 214-Modible frame; 215-Elastic buffer module; 221-Second driving component; 222-Second transmission module; 223-Top cylinder; 224-First mounting base; 225-Magnetic suction component; 311-Through hole; 312-Second limiting groove; 321-Air passage; 121a-First contouring groove; 121b-First limiting groove; 212a-First screw; 212b-Nut; 213a-Guide sleeve; 213b-Guide rod; 215a-Connector; 215b-First spring; 222a-First bevel gear; 222b-Second bevel gear; 222c-Second screw; 223a-Second contouring groove. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0034] Example 1

[0035] Figures 1-8 The diagram schematically illustrates a puncture device according to one embodiment of the present invention.

[0036] like Figures 1-8 As shown, the puncture device includes a gas cylinder positioning mechanism 1, a two-axis drive mechanism 2, and a puncture mechanism 3. The gas cylinder positioning mechanism 1 includes a mounting groove 10 that cooperates with the gas cylinder 500 for positioning. The two-axis drive mechanism 2 is used to drive the gas cylinder 500 to move up, down, and horizontally. The puncture mechanism 3 cooperates with the gas cylinder 500 and is used to puncture the gas cylinder 500.

[0037] The two-axis drive mechanism 2 includes a lifting drive assembly 21 and a horizontal drive assembly 22. The lifting drive assembly 21 is connected to the gas cylinder positioning mechanism 1 and is used to drive the gas cylinder 500 to move up and down in the height direction. The horizontal drive assembly 22 cooperates with the gas cylinder 500 and is used to drive the gas cylinder 500 to move horizontally.

[0038] Preferably, the puncture device also includes a mounting frame 4. The lifting drive assembly 21 includes a first drive member 211, a first transmission module 212, a guide module 213, and a movable frame 214. The movable frame 214 is movably mounted on the mounting frame 4 via the guide module 213. The first drive member 211 is mounted on the mounting frame 4 and is connected to the first transmission module 212. The first transmission module 212 is connected to the movable frame 214. The movable frame 214 is connected to the gas cylinder positioning mechanism 1.

[0039] As a further preferred embodiment, the first driving component 211 in this embodiment is a servo motor.

[0040] Preferably, the guide module 213 includes a guide sleeve 213a mounted on the mounting frame 4 and a guide rod 213b fitted onto the guide sleeve 213a and fixedly connected to the movable frame 214.

[0041] As a further preferred embodiment, the number of both guide rods 213b and guide sleeves 213a can be four.

[0042] Preferably, the first transmission module 212 includes a first screw 212a and a nut 212b. The first screw 212a is connected to the drive end of the first drive member 211 via a coupling or the like. The nut 212b is fitted around the outer periphery of the first screw 212a and is connected to the movable frame 214.

[0043] Preferably, the lifting drive assembly 21 further includes an elastic buffer module 215, which includes a connector 215a and a first spring 215b. The nut 212b is connected to the movable frame 214 via the connector 215a, and the first spring 215b is fitted around the outer periphery of the connector 215a and located between the nut 212b and the movable frame 214.

[0044] As a further preferred option, the connector 215a is a screw and there are four of them.

[0045] The connector 215a of the elastic buffer module 215 serves a connecting function, while the first spring 215b provides a buffering function. Since the movable frame 214 is movable, and the gas cylinder positioning mechanism 1 is positioned above the movable frame 214, when the gas cylinder 500 is installed, due to the weight of the gas cylinder 500 and the external force applied by the user, these forces act on the gas cylinder positioning mechanism 1 and are then transferred to the movable frame 214. The first spring 215b of the elastic buffer module 215 converts these forces into spring force, thus providing a buffering effect. The elastic buffer module 215 of this embodiment has both connecting and buffering functions, is small in size, and highly functional.

[0046] Preferably, the gas cylinder positioning mechanism 1 includes an outer bracket 11 and an inner bracket 12. The outer bracket 11 is provided with a cavity and is connected to the puncture mechanism 3 and the horizontal drive assembly 22 respectively. The inner bracket 12 is fitted inside the outer bracket 11 and its bottom is connected to the movable frame 214. The top of the inner bracket 12 is provided with a first contour groove 121a that cooperates with the gas cylinder 500 for positioning. The first contour groove 121a and the outer bracket 11 together form an installation groove 10.

[0047] Preferably, the inner bracket 12 includes a top block 121, a base 122, a second spring 123, and a guide pin 124. The top block 121 is movably mounted above the base 122 and guided by the guide pin 124. One end of the guide pin 124 is threadedly connected to the base 122, and the other end is slidably engaged with the top block 121. A first limiting groove 121b is provided at the bottom of the top block 121. The second spring 123 is installed in the first limiting groove 121b and abuts against the top block 121 and the base 122 respectively.

[0048] Preferably, the horizontal drive assembly 22 includes a second drive member 221, a second transmission module 222 and a top cylinder 223. The second drive member 221 is connected to the second transmission module 222, the second transmission module 222 is connected to the top cylinder 223, and the top cylinder 223 cooperates with the gas cylinder 500.

[0049] As a further preferred embodiment, the second driving component 221 in this embodiment is a servo motor.

[0050] Preferably, the horizontal drive assembly 22 further includes a first mounting base 224, which is connected to the outer bracket 11. The second transmission module 222 includes a first bevel gear 222a, a second bevel gear 222b, and a second screw 222c. The first bevel gear 222a is coaxially connected to the drive end of the second drive member 221. The second bevel gear 222b meshes with the first bevel gear 222a. The second screw 222c is fitted onto the second bevel gear 222b. Both the first bevel gear 222a and the second bevel gear 222b are rotatably mounted on the first mounting base 224. The top cylinder 223 is movably fitted onto the outer periphery of the second screw 222c and slides with the first mounting base 224.

[0051] Preferably, the top cylinder 223 has a second contoured groove 223a that cooperates with the tail of the gas cylinder 500. The bottom of the second contoured groove 223a is provided with a magnetic suction element 225 that cooperates with the gas cylinder 500. Thus, the magnetic suction element 225 is a magnetic sheet. Its function is that when the gas in the gas cylinder 500 is used up and needs to be replaced, and the gas cylinder 500 needs to be removed from the mounting groove 10, the horizontal drive component 22 works, driving the top cylinder 223 to retract and reset. At this time, the magnetic suction element 225 will attract the gas cylinder 500 and drive the gas cylinder 500 to retract together. The top seat will also retract and reset under the action of the second spring 123. At this time, the lifting drive component 21 can drive the inner bracket 12 and the gas cylinder 500 to rise together.

[0052] Preferably, the puncture device further includes a first sensing mechanism 5 and a second sensing mechanism 6. The first sensing mechanism 5 includes a first sensor 51 mounted on the mounting frame 4 and a first sensing element 52 mounted on the movable frame 214 and cooperating with the first sensor 51. The second sensing mechanism 6 includes a second sensor 61 mounted on the mounting frame 4 and a second sensing element 62 mounted on the top cylinder 223 and cooperating with the second sensor 61.

[0053] As a further preferred embodiment, the first sensor 51 and the second sensor 61 are each a pair. The pair of first sensors 51 are disposed on the upper and lower sides of the first sensing element 52, and the pair of second sensors 61 are disposed on the left and right sides of the second sensing element 62. The first sensor 51 and the second sensor 61 are commercially available microswitches, proximity switches, or photoelectric sensors, etc., and the first sensing element 52 and the second sensing element 62 are sheet-like sensing elements.

[0054] Preferably, the puncture mechanism 3 includes a second mounting base 31, a puncture needle 32, and an output tube 33. The second mounting base 31 has a through hole 311 that mates with the mouth of the gas cylinder 500. The puncture needle 32 is installed in the second mounting base 31 with its head extending into the through hole 311. The second mounting base 31 has a second limiting groove 312 that mates with the output tube 33. One end of the output tube 33 extends into the second limiting groove 312 of the second mounting base 31, and the other end extends out of the second mounting base 31 and can be connected to an external gas pipeline to output gas from the gas cylinder 500.

[0055] Preferably, the needle 32 has an air passage 321 at its center that is connected to the output pipe 33.

[0056] The working principle of the piercing device of this utility model is as follows:

[0057] First, the gas cylinder 500 is placed into the mounting slot 10. Then, the lifting drive assembly 21 operates, with the first drive component 211 driving the first screw 212a to rotate, causing the nut 212b to move downwards along the first screw 212a. Since the nut 212b is connected to the movable frame 214, which is connected to the inner bracket 12, the downward movement of the nut 212b pulls the movable frame 214 and the inner bracket 12 downwards together. During the movement, the guide rod 213b moves relative to the guide sleeve 213a, serving as a guide and ensuring smooth operation during the downward movement. The first sensing mechanism 5 acts as a position detection mechanism, ensuring accurate downward movement to the designated position. When the inner bracket 12 moves to the designated position, the mouth of the gas cylinder 500 is aligned with the through hole 311 of the puncture mechanism 3. At this time, the lifting drive... Component 21 stops operating; horizontal drive component 22 operates, the second drive component 221 drives the first bevel gear 222a to rotate, the first bevel gear 222a drives the second bevel gear 222b to rotate, so that the second screw 222c moves relative to the second bevel gear 222b toward the top cylinder 223. Since the top cylinder 223 is connected to the screw, the translation of the second screw 222c will drive the top cylinder 223 to translate. The upper end face of the second mounting base 31 plays a guiding role in the translation of the top cylinder 223. After the top cylinder 223 translates to contact the gas cylinder 500, the second contour groove 223a fits with the tail of the gas cylinder 500. The continued translation of the top cylinder 223 will push the gas cylinder 500 to translate together. The mouth of the gas cylinder 500 extends into the through hole 311 of the puncture mechanism 3 and contacts the puncture needle 32 to complete the puncture.

[0058] When the gas in cylinder 500 is used up and needs to be replaced, or when cylinder 500 needs to be removed for other reasons, the horizontal drive assembly 22 works first, and the second drive assembly 221 works, causing the second screw 222c to move away from the top cylinder 223 relative to the second bevel gear 222b, driving the top cylinder 223 to move and reset. Since the second contour groove 223a of the top cylinder 223 is provided with a magnetic suction component 225, the gas cylinder 500 is attracted to the top cylinder 223 at this time. The translation of the top cylinder 223 will drive the gas cylinder 500 to move together, and the gas cylinder 500 will move backward and reset. Due to the setting of the second spring 123, the top seat will also move backward and reset under the action of the second spring 123. Then the lifting drive assembly 21 works, driving the movable frame 214 and the inner bracket 12 to move upward. After moving into place, the gas cylinder 500 can be removed.

[0059] The piercing device of this invention has at least the following advantages over the prior art:

[0060] This utility model provides a novel puncture device that automates the puncture of gas cylinders, replacing the traditional manual operation of twisting the cylinder. This avoids the drawbacks of manual operation and offers numerous advantages such as portability, easy cylinder replacement, high puncture efficiency, high safety, and minimal gas leakage.

[0061] Example 2

[0062] According to another aspect of the present invention, a coffee machine is also provided, including a water tank 100, a coffee powder bowl, an air passage system 300, a gas cylinder puncture device 400, and a gas cylinder 500. The coffee powder bowl is used to hold coffee powder and is located at the bottom of the water tank 100. The gas cylinder puncture device 400 cooperates with the gas cylinder 500 to puncture the gas cylinder 500 and connect the gas cylinder 500 and the air passage system 300. The gas outlet of the air passage system 300 is connected to the water tank 100. The gas cylinder puncture device 400 adopts the puncture device described in Embodiment 1.

[0063] The air system 300 includes at least a pressure reducing valve, a connecting pipe and an air inlet pipe 300a. The input end of the connecting pipe is connected to the output pipe 33 of the puncture mechanism 3, and the output end is connected to the air inlet end of the air inlet pipe 300a. The air inlet pipe 300a can be installed in the water tank 100 and its air outlet extends into the interior of the water tank 100.

[0064] Preferably, the coffee machine in this embodiment also includes a coffee powder holder 200, which is disposed at the bottom of the water tank 100 and detachably connected to the water tank 100. The coffee powder container is fitted inside the coffee powder holder 200 and can be pressed firmly against the bottom of the water tank 100 by the coffee powder holder 200. Thus, hot water in the water tank 100 flows from the bottom of the water tank 100 into the coffee powder container, comes into contact with the coffee powder inside the coffee powder container to obtain coffee liquid, and the coffee liquid flows out from the filter hole at the bottom of the coffee powder container.

[0065] The coffee machine in this embodiment uses the aforementioned puncture device, which can automatically puncture the gas cylinder 500, making it easy to operate and convenient to replace the gas cylinder 500.

[0066] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A piercing device, characterized in that, It includes a gas cylinder positioning mechanism (1), a two-axis drive mechanism (2), and a puncture mechanism (3). The gas cylinder positioning mechanism (1) includes a mounting groove (10) that fits into the gas cylinder (500). The two-axis drive mechanism (2) is used to drive the gas cylinder (500) to move up, down, and horizontally. The puncture mechanism (3) fits into the gas cylinder (500) and is used to puncture the gas cylinder (500). The two-axis drive mechanism (2) includes a lifting drive assembly (21) and a horizontal drive assembly (22). The lifting drive assembly (21) is connected to the gas cylinder positioning mechanism (1) and is used to drive the gas cylinder (500) to move up and down in the height direction. The horizontal drive assembly (22) cooperates with the gas cylinder (500) and is used to drive the gas cylinder (500) to translate in the horizontal direction.

2. The puncture device according to claim 1, characterized in that, It also includes a mounting frame (4). The lifting drive assembly (21) includes a first drive member (211), a first transmission module (212), a guide module (213), and a movable frame (214). The movable frame (214) is movably mounted on the mounting frame (4) through the guide module (213). The first drive member (211) is mounted on the mounting frame (4) and is connected to the first transmission module (212). The first transmission module (212) is connected to the movable frame (214). The movable frame (214) is connected to the gas cylinder positioning mechanism (1). The first transmission module (212) includes a first screw (212a) and a nut (212b). The first screw (212a) is connected to the drive end of the first drive member (211). The nut (212b) is fitted around the outer periphery of the first screw (212a) and connected to the movable frame (214).

3. The piercing device according to claim 2, characterized in that, The lifting drive assembly (21) further includes an elastic buffer module (215), which includes a connector (215a) and a first spring (215b). The nut (212b) is connected to the movable frame (214) through the connector (215a). The first spring (215b) is fitted around the outer periphery of the connector (215a) and is located between the nut (212b) and the movable frame (214).

4. The puncture device according to claim 2, characterized in that, The gas cylinder positioning mechanism (1) includes an outer bracket (11) and an inner bracket (12). The outer bracket (11) has a cavity and is connected to the puncture mechanism (3) and the horizontal drive assembly (22) respectively. The inner bracket (12) is fitted inside the outer bracket (11) and its bottom is connected to the movable frame (214). The top of the inner bracket (12) is provided with a first contour groove (121a) that cooperates with the gas cylinder (500) for positioning. The first contour groove (121a) and the outer bracket (11) together form the mounting groove (10).

5. The piercing device according to claim 4, characterized in that, The inner bracket (12) includes a top block (121), a base (122), a second spring (123), and a guide pin (124). The top block (121) is movably mounted above the base (122) and guided by the guide pin (124). A first limiting groove (121b) is provided at the bottom of the top block (121). The second spring (123) is installed in the first limiting groove (121b) and abuts against the top block (121) and the base (122) respectively.

6. The piercing device according to claim 4, characterized in that, The horizontal drive assembly (22) includes a second drive member (221), a second transmission module (222), and a top cylinder (223). The second drive member (221) is connected to the second transmission module (222), the second transmission module (222) is connected to the top cylinder (223), and the top cylinder (223) cooperates with the gas cylinder (500).

7. The piercing device according to claim 6, characterized in that, The horizontal drive assembly (22) further includes a first mounting base (224), which is connected to the outer bracket (11). The second transmission module (222) includes a first bevel gear (222a), a second bevel gear (222b), and a second screw (222c). The first bevel gear (222a) is connected to the drive end of the second drive member (221). The second bevel gear (222b) meshes with the first bevel gear (222a). The second screw (222c) is fitted onto the second bevel gear (222b). Both the first bevel gear (222a) and the second bevel gear (222b) are mounted on the first mounting base (224). The top cylinder (223) is movably fitted onto the outer periphery of the second screw (222c) and slides with the first mounting base (224).

8. The piercing device according to claim 6, characterized in that, The top cylinder (223) is provided with a second contour groove (223a) that is matched with the tail of the gas cylinder (500). The bottom of the second contour groove (223a) is provided with a magnetic suction element (225) that matches the gas cylinder (500).

9. The puncturing device according to any one of claims 1-8, characterized in that, The puncture mechanism (3) includes a second mounting base (31), a puncture needle (32), and an output tube (33). The second mounting base (31) has a through hole (311) that matches the mouth of the gas cylinder (500). The puncture needle (32) is installed in the second mounting base (31) and its head extends into the through hole (311). One end of the output tube (33) extends into the second mounting base (31). The center of the puncture needle (32) has an air passage (321) that communicates with the output tube (33).

10. A coffee machine, comprising a water tank (100), a coffee powder holder (200), a gas system (300), a gas cylinder puncture device (400), and a gas cylinder (500), wherein the coffee powder holder (200) is used to hold coffee powder and is disposed at the bottom of the water tank (100), the gas cylinder puncture device (400) cooperates with the gas cylinder (500) to puncture the gas cylinder (500) and connect the gas cylinder (500) to the gas system (300), and the outlet end of the gas system (300) is connected to the water tank (100), characterized in that, The gas cylinder puncture device (400) is the puncture device according to any one of claims 1-9.

Images