Carbon dioxide cylinder opening and closing device

Abstract

The application discloses a carbon dioxide gas cylinder opening and closing device, which comprises a carbon dioxide gas cylinder, a valve and a gas cylinder opening and closing driving mechanism, the valve is connected with the carbon dioxide gas cylinder, a gas through hole is formed in the valve in the axial direction, a carbon dioxide gas outlet is formed in one side of the valve and communicates with the gas through hole, and the gas through hole is automatically controlled to be connected with or disconnected from the carbon dioxide gas outlet through the gas cylinder opening and closing driving mechanism. The application has the advantages of simple structure, fast response speed, high control precision and automatic control.

Description

Technical Field

[0001] This invention relates to the field of gas cylinder control technology, specifically a carbon dioxide gas cylinder opening and closing device. Background Technology

[0002] Existing carbon dioxide cylinders are typically opened and closed by a manual valve installed at the cylinder nozzle. For example, a carbon dioxide valve disclosed in CN2017202025981 uses a special tool to push a one-way valve assembly, causing the one-way valve assembly to disengage from the cap seal, allowing gas to exit from the gas source through this disengagement point. Another example is a carbon dioxide valve disclosed in CN2018211206162, where a handwheel is fixedly mounted on the upper end of the valve stem, and the valve stem is rotated by turning the handwheel, thereby controlling the valve assembly to connect or close the inlet and outlet.

[0003] Manually controlling the opening and closing of gas cylinders requires manual operation, which is inconvenient, has a slow response speed, and poor precision control, making it unsuitable for remote control. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a carbon dioxide cylinder opening and closing device that is simple in structure, fast in response, high in control precision, and can achieve automatic control.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A carbon dioxide cylinder opening and closing device, characterized in that: it includes a carbon dioxide cylinder, a valve and a cylinder opening and closing drive mechanism, wherein the valve is connected to the carbon dioxide cylinder, a gas through hole is provided on the valve along the axial direction, and a carbon dioxide gas outlet communicating with the gas through hole is provided on one side of the valve.

[0007] The gas through-hole is automatically controlled to open and close with the carbon dioxide gas outlet via the gas cylinder opening and closing drive mechanism; no manual operation is required, the response speed is fast, and the control precision is high.

[0008] The valve of this invention has a valve stem and a spring inside its gas passage. The spring is located at the lower end of the valve stem. The valve stem moves downward under the drive of the gas cylinder opening and closing mechanism to connect the gas passage with the carbon dioxide gas outlet. The valve stem moves upward under the action of the spring to disconnect the gas passage from the carbon dioxide gas outlet.

[0009] The gas cylinder opening and closing drive mechanism of this utility model adopts an electromagnetic valve, and the valve core of the electromagnetic valve cooperates with the valve stem;

[0010] The valve core of the solenoid valve moves downward, driving the valve stem to move downward, thus connecting the gas passage to the carbon dioxide gas outlet; the valve core of the solenoid valve moves upward, and the valve stem moves upward under the action of the spring, thus disconnecting the gas passage from the carbon dioxide gas outlet; by using a solenoid valve to control the on / off of gas, the structure is simple, the response speed is fast, and the control accuracy is high.

[0011] The gas cylinder opening and closing drive mechanism of this utility model includes a valve core rod, a pressure plate, and a pressure plate drive mechanism. A hinge plate is provided at the top of the valve, and the middle part of the pressure plate is hinged to the hinge plate. One end of the pressure plate is the valve core rod contact end, and the other end is the drive end. The valve core rod contact end contacts the upper end of the valve core rod, and the lower end of the valve core rod extends into the valve to cooperate with the valve stem. The drive end cooperates with the pressure plate drive mechanism. When the drive end of the pressure plate is raised by the pressure plate drive mechanism, the valve core rod contact end of the pressure plate presses down on the valve core rod, driving the valve stem to move downwards and connect the gas passage to the carbon dioxide gas outlet. When the pressure plate drive mechanism releases the driving force, the valve stem moves upwards under the action of a spring, disconnecting the gas passage from the carbon dioxide gas outlet. By using an automatic drive mechanism combined with the lever principle, the gas flow is controlled, resulting in a simple structure, fast response speed, and high control accuracy.

[0012] The pressure plate driving mechanism of this utility model includes a drive motor and a cam. The driving end of the pressure plate is in contact with the cam, and the cam is driven to rotate by the drive motor. The gas flow is controlled by the cooperation of the drive motor and the lever structure. The structure is simple, the response speed is fast, and the control accuracy is high.

[0013] The cam of this invention is connected to a rotating bearing at one end, and the bearing is in contact with the pressure plate; by setting the bearing, the wear between the pressure plate and the cam can be reduced.

[0014] The gas cylinder opening and closing drive mechanism of this utility model also includes a back plate, which is connected to the valve body. The motor shaft of the drive motor passes through the back plate and is connected to the cam. The drive motor is also connected to the back plate. The position of the gas cylinder opening and closing drive mechanism is fixed by setting the back plate.

[0015] The back plate of this utility model is also provided with an upper detection sensor and a lower detection sensor, which are located on one side of the cam. By setting the upper detection sensor and the lower detection sensor, the extreme positions of the pressure plate being raised and lowered by the rotation of the cam are sensed.

[0016] The back plate of this utility model is also provided with an upper limit block and a lower limit block. The upper limit block is located above the cam, and the lower limit block is located below the cam. When the detection sensor fails, the setting of the upper limit block and the lower limit block can effectively prevent excessive rotation.

[0017] The pressure plate driving mechanism of this utility model adopts an electric push rod, and the driving end of the pressure plate is driven to rise by the electric push rod; the gas flow is controlled by the cooperation of the electric push rod and the lever structure. The structure is simple, the response speed is fast, and the control accuracy is high.

[0018] The valve of this utility model includes a valve seat and a valve body. The lower end of the valve seat is threaded to a carbon dioxide cylinder, and the upper end is threaded to the valve body. A gas through hole is provided on the valve seat along the axial direction. A valve body through hole communicating with the gas through hole is provided on the valve body along the axial direction. A carbon dioxide gas outlet communicating with the valve body through hole is provided on one side of the valve body. The valve seat is threaded to the valve body and the carbon dioxide cylinder, making installation and disassembly convenient.

[0019] The valve seat of this utility model is provided with a connecting sleeve, which is inserted into the upper end of the gas passage hole of the valve seat and connected to the valve seat. The connecting sleeve is provided with a valve stem through hole arranged along the axial direction, and the valve stem through hole extends radially inward to form an inner limiting boss.

[0020] The valve stem includes an upper moving rod and a lower sealing element. The outer diameter of the lower sealing element is larger than the outer diameter of the upper moving rod, and a sealing surface is formed between the lower sealing element and the upper moving rod.

[0021] The upper moving rod extends into the valve stem through hole and passes through the inner limiting boss of the connecting sleeve, and the sealing surface of the valve stem abuts against the lower end face of the inner limiting boss;

[0022] The gas passage of the valve seat includes an upper section and a lower section, and a spring limiting surface is formed between the upper section and the lower section. The lower end of the spring abuts against the spring limiting surface, and the upper end abuts against the lower seal of the valve stem.

[0023] Driven by the gas cylinder opening and closing drive mechanism, the valve stem moves downward, causing the sealing surface of the valve stem to move away from the lower end face of the inner limit boss, and the gas through hole connects with the carbon dioxide gas outlet. Under the action of the spring, the valve stem moves upward, causing the sealing surface of the valve stem to abut against the lower end face of the inner limit boss, and the gas through hole disconnects from the carbon dioxide gas outlet.

[0024] The beneficial effects of this invention are: the gas through hole is automatically controlled to open and close with the carbon dioxide gas outlet via the gas cylinder opening and closing drive mechanism; no manual operation is required, the response speed is fast, and the control accuracy is high. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the carbon dioxide cylinder opening and closing device in Example 1.

[0026] Figure 2 This is a front view of the carbon dioxide cylinder opening and closing device in Example 1.

[0027] Figure 3 yes Figure 2Sectional view of AA.

[0028] Figure 4 yes Figure 3 Enlarged view of point C in the middle.

[0029] Figure 5 This is a schematic diagram of the overall structure of the carbon dioxide cylinder opening and closing device in Example 2.

[0030] Figure 6 This is a schematic diagram of the overall structure of the carbon dioxide cylinder opening and closing device in Example 2 from another angle.

[0031] Figure 7 This is a front view of the carbon dioxide cylinder opening and closing device in Example 2.

[0032] Figure 8 yes Figure 7 BB section view.

[0033] Figure 9 yes Figure 8 Enlarged view of point D in the middle.

[0034] Attached image label: Carbon dioxide cylinder-1;

[0035] Valve seat-2, valve seat housing-201, upper external thread-2011, lower external thread-2012, gas through hole-2013, upper section of through hole-20131, lower section of through hole-20132, spring limiting surface-20133, upper internal thread-2014, connecting sleeve-202, valve stem through hole-2021, inner limiting boss-2022, valve stem-203, upper moving rod-2031, lower seal-2032, spring-204;

[0036] Valve body-3, lower end internal thread-301, carbon dioxide gas outlet-302, valve body through hole-303;

[0037] Solenoid valve-4, valve core-401;

[0038] Valve core rod-501, drive motor-502, back plate-503, pressure plate-504, bearing-505, cam-506, detection bar-507, upper limit block-5081, lower limit block-5082, upper detection sensor-5091, lower detection sensor-5092, hinge plate-510;

[0039] Sealing ring - 6. Detailed Implementation

[0040] The present invention will now be described in conjunction with the accompanying drawings and embodiments.

[0041] Example 1:

[0042] As attached Figure 1-4As shown, a carbon dioxide cylinder opening and closing device includes a carbon dioxide cylinder 1, a valve and a cylinder opening and closing drive mechanism. The valve is connected to the carbon dioxide cylinder 1, and a gas through hole is provided on the valve along the axial direction. A carbon dioxide gas outlet communicating with the gas through hole is provided on one side of the valve.

[0043] The gas through-hole is automatically controlled to open and close with the carbon dioxide gas outlet via the gas cylinder opening and closing drive mechanism; no manual operation is required, the response speed is fast, and the control precision is high.

[0044] The valve includes a valve seat 2 and a valve body 3. The valve seat 2 is provided with a valve seat housing 201. The valve seat housing 201 is provided with an upper external thread 2011 and a lower external thread 2012. A gas through hole 2013 is provided on the valve seat 2 along the axial direction. The upper end of the gas through hole 2013 is provided with an upper internal thread 2014. The gas through hole 2013 includes an upper section 20131 and a lower section 20132. A spring limiting surface 20133 is formed between the upper section 20131 and the lower section 20132.

[0045] The valve seat housing 201 is provided with a connecting sleeve 202, a valve stem 203 and a spring 204. The connecting sleeve 202 is provided with an external thread. The connecting sleeve 202 is inserted into the upper end of the gas passage 2013 and is threadedly connected to the gas passage 2013 through the cooperation of the upper internal thread 2014 and the external thread of the connecting sleeve. The upper end of the connecting sleeve 202 extends outward to form an outer limiting boss. The outer limiting boss abuts against the upper end surface of the valve seat 2. A sealing ring 6 is provided between the connecting sleeve 202 and the upper end of the valve seat 2 for sealing.

[0046] The connecting sleeve 202 has an axially arranged valve stem through hole 2021 inside, and the valve stem through hole 2021 extends radially inward to form an inner limiting boss 2022;

[0047] The valve stem 203 includes an upper moving rod 2031 and a lower sealing element 2032. The outer diameter of the lower sealing element 2032 is larger than the outer diameter of the upper moving rod 2031, and a sealing surface is formed between the lower sealing element 2032 and the upper moving rod 2031. The upper moving rod 2031 extends into the valve stem through hole 2021 and passes through the inner limiting boss 2022 of the connecting sleeve 202. The sealing surface of the valve stem 203 abuts against the lower end face of the inner limiting boss 2022, and a sealing ring 6 is provided between the sealing surface of the valve stem 203 and the lower end face of the inner limiting boss 2022.

[0048] The lower end of the spring 204 abuts against the spring limiting surface 20133, and the upper end abuts against the lower sealing element 2032 of the valve stem 203.

[0049] The valve body 3 has an axially oriented valve body through hole 303 communicating with the gas through hole 2013. A carbon dioxide gas outlet 302 communicating with the valve body through hole 303 is provided on one side of the valve body 3. The lower end of the valve body through hole 303 is provided with a lower internal thread 301. The upper end of the valve seat shell 201 is threadedly connected to the lower end of the valve body 3 via an upper external thread 2011 and a lower internal thread 301. The lower end of the valve seat shell 201 is threadedly connected to the carbon dioxide cylinder 1 via a lower external thread 2012. A sealing ring 6 is provided at the connection between the valve body 3 and the valve seat 2. The valve seat is threadedly connected to the valve body and the carbon dioxide cylinder, making installation and disassembly convenient.

[0050] The valve stem 203 moves downward under the drive of the gas cylinder opening and closing drive mechanism, causing the sealing surface of the valve stem 203 to move away from the lower end face of the inner limiting boss 2022, and the gas through hole 2013 is connected to the carbon dioxide gas outlet 302; the valve stem 203 moves upward under the action of the spring 204, causing the sealing surface of the valve stem 203 to abut against the lower end face of the inner limiting boss 2022, and the gas through hole 2013 is disconnected from the carbon dioxide gas outlet 302.

[0051] In this embodiment, the gas cylinder opening and closing drive mechanism adopts a solenoid valve 4. The solenoid valve 4 is connected to the controller. The solenoid valve 4 is fixed on the upper end of the valve body 3. The valve core 401 of the solenoid valve 4 extends into the valve body through hole 303 and the valve stem through hole 2021. The lower end face of the valve core 401 cooperates with the upper end face of the valve stem 203.

[0052] The valve core 401 of the solenoid valve 4 moves downward, driving the valve stem 203 to move downward, thus connecting the gas passage 2013 with the carbon dioxide gas outlet 302. When the valve core 401 of the solenoid valve 4 moves upward, the valve stem 203, without the downward force of the valve core 401, moves upward under the action of the spring 204, thus disconnecting the gas passage 2013 from the carbon dioxide gas outlet 302. By using the solenoid valve 4 to control the flow of gas, the structure is simple, the response speed is fast, and the control accuracy is high.

[0053] In this embodiment, the controller is either an MCU-based controller or a PLC controller.

[0054] When using this utility model:

[0055] 1. When carbon dioxide cylinder 1 needs to be opened, the controller controls the solenoid valve 4 to be energized. The valve core 401 of the solenoid valve 4 moves down, driving the valve stem 203 to move down, so that the sealing surface of the valve stem 203 moves away from the lower end face of the inner limit boss 2022. Carbon dioxide in carbon dioxide cylinder 1 is discharged through the gas through hole 2013, valve stem through hole 2021, valve body through hole 303, and carbon dioxide gas outlet 302.

[0056] 2. When it is necessary to close carbon dioxide cylinder 1, the controller controls the solenoid valve 4 to be de-energized. The valve core 401 of the solenoid valve 4 moves upward, and the valve stem 203 moves upward under the action of the spring 204. The sealing surface of the valve stem 203 contacts and abuts against the lower end face of the inner limit boss 2022 to achieve a seal, and the carbon dioxide cylinder 1 is closed.

[0057] Example 2:

[0058] The difference between Example 2 and Example 1 lies in the structure of the gas cylinder opening and closing drive mechanism, as shown in the attached diagram. Figure 5-9 As shown, the gas cylinder opening and closing drive mechanism includes a valve core rod 501, a pressure plate 504, and a pressure plate drive mechanism. A hinge plate 510 is provided at the top of the valve body 3. The middle part of the pressure plate 504 is hinged to the hinge plate 510. One end of the pressure plate 504 is the valve core rod contact end, and the other end is the drive end. The valve core rod contact end contacts the upper end of the valve core rod 501. The lower end of the valve core rod 501 extends into the valve body through hole 303 and the valve stem through hole 2021, cooperating with the valve stem 203. The drive end cooperates with the pressure plate drive mechanism. When the drive end of the pressure plate 504 is raised by the pressure plate drive mechanism, the pressure plate 504... When the valve core rod 501 is pressed down at its contact end, the valve stem 203 is driven to move downward, causing the sealing surface of the valve stem 203 to move away from the lower end face of the inner limiting boss 2022, and the gas through hole 2013 is connected to the carbon dioxide gas outlet 302. When the pressure plate driving mechanism releases the driving force, the valve stem 203 moves upward under the action of the spring 204, causing the sealing surface of the valve stem 203 to abut against the lower end face of the inner limiting boss 2022, and the gas through hole 2013 is disconnected from the carbon dioxide gas outlet 302. By adopting an automatic driving mechanism in conjunction with the lever principle, the gas flow is controlled, resulting in a simple structure, fast response speed, and high control accuracy.

[0059] The pressure plate driving mechanism includes a drive motor 502 and a cam 506. The driving end of the pressure plate 504 is in contact with the cam 506. The cam 506 is driven to rotate by the drive motor 502. The drive motor 502 is connected to the controller.

[0060] One end of the cam 506 is connected to a rotating bearing 505, and the driving end of the pressure plate 504 rests on the bearing 505; by setting the bearing 505, the wear between the pressure plate 504 and the cam 506 can be reduced.

[0061] In this embodiment, a connecting shaft is fixed at one end of the cam 506, the inner ring of the bearing 505 is fixedly connected to the connecting shaft, and the outer ring of the bearing 505 is in contact with the lower end face of the pressure plate drive end.

[0062] The gas cylinder opening and closing drive mechanism also includes a back plate 503, which is fixedly connected to the valve body 3. The motor shaft of the drive motor 502 passes through the back plate 503 and is connected to the cam 506. The drive motor 502 is fixedly connected to the back plate 503. The position of the gas cylinder opening and closing drive mechanism is fixed by setting the back plate 503.

[0063] The back plate 503 is also provided with an upper detection sensor 5091 and a lower detection sensor 5092. The upper detection sensor 5091 and the lower detection sensor 5092 are respectively connected to the controller. The upper detection sensor 5091 and the lower detection sensor 5092 are located on one side of the cam 506, with the upper detection sensor 5091 located above the lower detection sensor 5092. By setting the upper detection sensor 5091 and the lower detection sensor 5092, the extreme positions of the pressure plate 504 being raised and lowered are sensed by the rotation of the cam 506.

[0064] In this embodiment, the upper detection sensor 5091 and the lower detection sensor 5092 are photoelectric sensors. A detection strip 507 is fixedly connected to the side of the cam away from the bearing. The detection strip 507 is inductively engaged with the upper detection sensor 5091 and the lower detection sensor 5092. The upper detection sensor 5091 and the lower detection sensor 5092 are not limited to this. They can also be proximity switches, capacitive sensors, etc.

[0065] The back plate 503 is also provided with an upper limit block 5081 and a lower limit block 5082. The upper limit block 5081 is located above the cam 506, and the lower limit block 5082 is located below the cam 506. When the detection sensor fails, the setting of the upper limit block 5081 and the lower limit block 5082 can effectively prevent excessive rotation.

[0066] When using this utility model:

[0067] 1. When carbon dioxide cylinder 1 needs to be opened, the controller controls the drive motor 502 to start. The motor shaft of the drive motor 502 rotates forward, causing the end of the cam 506 with the bearing 505 to move upward, which raises the drive end of the pressure plate 504. Under the action of the lever, the valve core rod contact end of the pressure plate 504 moves downward, pressing the valve core rod 501. The valve core rod 501 moves downward, causing the valve rod 203 to move downward, so that the sealing surface of the valve rod 203 moves away from the lower end face of the inner limit boss 2022. Carbon dioxide in carbon dioxide cylinder 1 is discharged through the gas through hole 2013, valve rod through hole 2021, valve body through hole 303, and carbon dioxide gas outlet 302.

[0068] 2. When it is necessary to close carbon dioxide cylinder 1, the controller controls the motor shaft of drive motor 502 to reverse and drive the end of cam 506 with bearing 505 to move downward. Valve core rod 501 loses downward pressure, and valve rod 203 moves upward under the action of spring 204. The sealing surface of valve rod 203 contacts and abuts against the lower end face of inner limit boss 2022 to achieve sealing and close carbon dioxide cylinder 1.

[0069] 3. During the rotation of cam 506, when the upper detection sensor 5091 senses the detection bar 507 and the detection bar 507 reaches the upper limit position, the upper detection sensor 5091 feeds back the signal to the controller, and the controller controls the drive motor 502 to reduce the rotation angle of the motor shaft. When the lower detection sensor 5092 senses the detection bar 507 and the detection bar 507 reaches the lower limit position, the lower detection sensor 5092 feeds back the signal to the controller, and the controller controls the drive motor 502 to reduce the rotation angle of the motor shaft.

[0070] 4. When the upper detection sensor 5091 and / or the lower detection sensor 5092 fails, the upper limit block 5081 and the lower limit block 5082 prevent the cam 506 from rotating excessively.

[0071] Example 3:

[0072] The difference between Example 3 and Example 2 is that the pressure plate driving mechanism adopts an electric push rod, which is connected to the controller. The electric push rod is located at the lower end of the pressure plate driving end, and the driving end of the pressure plate is raised by the electric push rod. The gas flow is controlled by the electric push rod and the lever structure. The structure is simple, the response speed is fast, and the control accuracy is high.

[0073] When using this utility model:

[0074] 1. When carbon dioxide cylinder 1 needs to be opened, the controller controls the electric push rod to start. The push rod extends and contacts the driving end of the pressure plate 504, lifting the driving end of the pressure plate 504. Under the action of the lever, the valve core pressure rod contact end of the pressure plate 504 faces downward, pressing the valve core pressure rod 501. The valve core pressure rod 501 moves down, causing the valve rod 203 to move down, so that the sealing surface of the valve rod 203 is away from the lower end face of the inner limit boss 2022. Carbon dioxide in carbon dioxide cylinder 1 is discharged through the gas through hole 2013, valve rod through hole 2021, valve body through hole 303, and carbon dioxide gas outlet 302.

[0075] 2. When it is necessary to close carbon dioxide cylinder 1, the controller controls the electric push rod to retract, the valve core pressure rod 501 loses downward pressure, the valve stem 203 moves upward under the action of spring 204, and the sealing surface of the valve stem 203 contacts and abuts against the lower end face of the inner limit boss 2022 to achieve sealing, and carbon dioxide cylinder 1 is closed.

[0076] The structure of the cylinder opening and closing drive mechanism is not limited to Embodiments 1-3. It can also be a cylinder, a liquid cylinder, etc., as long as it can realize the automatic opening and closing of the carbon dioxide cylinder.

Claims

1. A carbon dioxide cylinder opening and closing device, characterized in that: It includes a carbon dioxide cylinder, a valve, and a cylinder opening and closing drive mechanism. The valve is connected to the carbon dioxide cylinder, and the valve has a gas through hole along the axial direction. A carbon dioxide gas outlet communicating with the gas through hole is opened on one side of the valve. The gas through-hole is automatically controlled to open and close with the carbon dioxide gas outlet via a gas cylinder opening and closing drive mechanism.

2. The carbon dioxide cylinder opening and closing device according to claim 1, characterized in that: The valve has a valve stem and a spring inside its gas passage. The spring is located at the lower end of the valve stem. The valve stem moves downward under the drive of the gas cylinder opening and closing mechanism to connect the gas passage with the carbon dioxide gas outlet. The valve stem moves upward under the action of the spring to disconnect the gas passage from the carbon dioxide gas outlet.

3. The carbon dioxide cylinder opening and closing device according to claim 2, characterized in that: The gas cylinder opening and closing drive mechanism adopts a solenoid valve, and the valve core of the solenoid valve cooperates with the valve stem; The valve core of the solenoid valve moves downward, driving the valve stem to move downward so that the gas passage is connected to the carbon dioxide gas outlet; the valve core of the solenoid valve moves upward, and the valve stem moves upward under the action of the spring so that the gas passage is disconnected from the carbon dioxide gas outlet.

4. The carbon dioxide cylinder opening and closing device according to claim 2, characterized in that: The gas cylinder opening and closing drive mechanism includes a valve core rod, a pressure plate, and a pressure plate drive mechanism. The valve has a hinge plate at the top, and the middle part of the pressure plate is hinged to the hinge plate. One end of the pressure plate is the valve core rod contact end, and the other end is the drive end. The valve core rod contact end is in contact with the upper end of the valve core rod, and the lower end of the valve core rod extends into the valve and cooperates with the valve stem. The drive end cooperates with the pressure plate drive mechanism. When the driving end of the pressure plate is raised by the pressure plate driving mechanism, the valve core rod contact end of the pressure plate presses down the valve core rod, driving the valve rod to move down so that the gas passage is connected to the carbon dioxide gas outlet. When the pressure plate drive mechanism releases the driving force, the valve stem moves upward under the action of the spring, causing the gas passage to disconnect from the carbon dioxide gas outlet.

5. A carbon dioxide cylinder opening and closing device according to claim 4, characterized in that: The pressure plate driving mechanism includes a drive motor and a cam. The driving end of the pressure plate is in contact with the cam, and the cam is driven to rotate by the drive motor.

6. A carbon dioxide cylinder opening and closing device according to claim 5, characterized in that: One end of the cam is connected to a rotating bearing, which is in contact with the pressure plate.

7. A carbon dioxide cylinder opening and closing device according to claim 5 or 6, characterized in that: The gas cylinder opening and closing drive mechanism also includes a back plate, which is connected to the valve. The motor shaft of the drive motor passes through the back plate and is connected to the cam. The drive motor is also connected to the back plate.

8. A carbon dioxide cylinder opening and closing device according to claim 7, characterized in that: The back plate is also equipped with an upper detection sensor and a lower detection sensor, which are located on one side of the cam.

9. A carbon dioxide cylinder opening and closing device according to claim 8, characterized in that: The back plate is also provided with an upper limit block and a lower limit block. The upper limit block is located above the cam, and the lower limit block is located below the cam.

10. A carbon dioxide cylinder opening and closing device according to claim 2, characterized in that: The pressure plate driving mechanism uses an electric push rod, and the driving end of the pressure plate is raised by the electric push rod.

11. A carbon dioxide cylinder opening and closing device according to claim 2, 3, 4, 5, 6, 8, 9, or 10, characterized in that: The valve includes a valve seat and a valve body. The lower end of the valve seat is threaded to a carbon dioxide cylinder, and the upper end is threaded to the valve body. The valve seat has a gas through hole along the axial direction. The valve body has a valve body through hole along the axial direction that communicates with the gas through hole. A carbon dioxide gas outlet that communicates with the valve body through hole is opened on one side of the valve body.

12. A carbon dioxide cylinder opening and closing device according to claim 11, characterized in that: The valve seat is provided with a connecting sleeve, which is inserted into the upper end of the gas passage hole of the valve seat and connected to the valve seat. The connecting sleeve is provided with a valve stem through hole arranged along the axial direction, and the valve stem through hole extends radially inward to form an inner limiting boss. The valve stem includes an upper moving rod and a lower sealing element. The outer diameter of the lower sealing element is larger than the outer diameter of the upper moving rod, and a sealing surface is formed between the lower sealing element and the upper moving rod. The upper moving rod extends into the valve stem through hole and passes through the inner limiting boss of the connecting sleeve, and the sealing surface of the valve stem abuts against the lower end face of the inner limiting boss; The gas passage of the valve seat includes an upper section and a lower section, and a spring limiting surface is formed between the upper section and the lower section. The lower end of the spring abuts against the spring limiting surface, and the upper end abuts against the lower seal of the valve stem. The valve stem moves downward under the drive of the gas cylinder opening and closing drive mechanism, so that the sealing surface of the valve stem is away from the lower end face of the inner limit boss, and the gas through hole is connected to the carbon dioxide gas outlet. The valve stem moves upward under the action of the spring, causing the sealing surface of the valve stem to abut against the lower end face of the inner limiting boss, thus disconnecting the gas passage from the carbon dioxide gas outlet.

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