A device and method for on-line automatic extraction of mainstream cigarette smoke by puff

Abstract

The present application belongs to the technical field of cigarette mainstream smoke analysis equipment, and discloses a cigarette mainstream smoke puff-by-puff online automatic extraction device and method. The automatic extraction device comprises a valve seat, an extraction seat, a plurality of smoke guide pipes and a suction unit. A plurality of first control valves are arranged in the valve seat. The extraction seat is sealingly connected with the valve seat and has an extraction cavity. A plurality of extraction containers are arranged in the extraction cavity. The extraction cavity has a first communication port. One end of each smoke guide pipe is inserted into an extraction container, and the other end is connected with the outlet of a first control valve. The suction unit is connected with the first communication port through a second control valve. The device realizes synchronous dissolution of all components of gaseous and particulate phases of smoke by direct liquid phase trapping, avoids filter adsorption loss and manual operation error, supports puff-by-puff independent collection and multi-cigar composition circulation enrichment at the same position, significantly improves the detection sensitivity of trace substances, realizes full-process automatic control, and greatly improves the detection efficiency and data traceability.

Description

Technical Field

[0001] This invention relates to the technical field of cigarette mainstream smoke analysis equipment, and in particular to an online automatic extraction device and method for cigarette mainstream smoke puff by puff. Background Technology

[0002] In traditional analysis of mainstream cigarette smoke, a standard smoking machine combined with a Cambridge filter pad is commonly used for particulate matter collection. The basic procedure is as follows: The smoking machine simulates human inhalation, passing the mainstream smoke produced by combustion through the Cambridge filter pad. Particulate matter is trapped by the filter, while gaseous components are expelled. Subsequently, the filter pad needs to be manually removed, and the residue on the filter pad is extracted using a solvent. Finally, the extract is transferred to analytical equipment (such as high-performance liquid chromatography, HPLC) for component determination. However, this traditional method has the following significant drawbacks: First: The operation is cumbersome and prone to errors. The process of disassembling, cleaning and transferring the filter depends on manual operation, which can easily cause sample loss or cross-contamination. Second: It is impossible to perform individual analysis. The flue gas from all the puffs is captured on the same filter, making it difficult to distinguish the compositional differences between different puffs. Third: The gaseous components are severely lost, and only particulate matter can be effectively captured. A large number of volatile gaseous components (such as acetaldehyde, benzene series compounds, etc.) are not retained. Fourth: Low extraction efficiency; substances adsorbed by the filter need to be dissolved a second time, resulting in incomplete extraction and affecting the accuracy of detection. Fifth: Low level of automation. The entire process, from suction to analysis, lacks integrated design, making it difficult to achieve high-throughput continuous testing. Summary of the Invention

[0003] The purpose of this invention is to provide an online automatic extraction device for mainstream cigarette smoke, which eliminates the need for using, replacing, or processing Cambridge filters. It achieves simultaneous dissolution of all components in the gaseous and particulate phases of the smoke through direct liquid-phase capture, avoiding filter adsorption losses and human error. It supports independent collection puff by puff and cyclic enrichment of components from the same location in multiple cigarettes, significantly improving the sensitivity of trace substance detection. The fully automated process greatly enhances detection efficiency and data traceability, and is compatible with mainstream analytical platforms such as liquid chromatography, providing high-precision technical support for cigarette harm reduction research and quality control.

[0004] The second objective of this invention is to provide an online automatic extraction method for mainstream cigarette smoke, which achieves simultaneous dissolution of all components in the gaseous and particulate phases of the smoke through direct liquid-phase capture, avoiding filter adsorption losses and human operation errors. It supports independent collection for each puff and cyclic enrichment of components from the same puff in multiple cigarettes, significantly improving the sensitivity of trace substance detection. It has a high degree of automation and can greatly improve detection efficiency and data traceability.

[0005] To achieve this objective, the present invention adopts the following technical solution: This invention discloses an online automatic extraction device for mainstream cigarette smoke, comprising: a valve seat, wherein a plurality of first control valves are disposed within the valve seat, the valve seat has an airflow channel and an installation port communicating with the airflow channel, the airflow channel being connected to the inlet of the plurality of first control valves respectively, and the installation port being used to hold a cigarette; an extraction seat, the extraction seat being sealed to the valve seat and having an extraction chamber, the extraction chamber having a plurality of extraction containers, the extraction chamber having a first communication port; a plurality of smoke guide pipes, the plurality of smoke guide pipes being arranged one-to-one with the extraction containers, one end of each smoke guide pipe being inserted into the extraction container, and the other end being connected to the outlet of the first control valve; and an extraction unit, the extraction unit being connected to the first communication port through a second control valve.

[0006] In some embodiments, the extraction chamber further includes a second communication port, which is located on two opposite side walls of the extraction seat, along with the first communication port. The cigarette mainstream smoke extraction device further includes a pressure pump and a liquid level detector. The second communication port is connected to the pressure pump via a third control valve, and the liquid level detector is used to detect the liquid level height in the smoke guide pipe.

[0007] In some embodiments, the valve seat is provided with a mounting protrusion surrounding the mounting port, and the cigarette mainstream smoke extraction device further includes a cigarette holder for supporting the cigarette.

[0008] In some specific embodiments, the cigarette holder includes: a holder body having a mounting cavity, one end of which is fitted onto the mounting protrusion; a plurality of labyrinth rings stacked within the mounting cavity, the cigarette passing through the plurality of labyrinth rings and extending out of the other end of the mounting cavity; and a sealing ring located between the side wall of the mounting cavity and the outer side wall of the mounting protrusion.

[0009] In some embodiments, the suction unit includes: a suction bracket; a drive member mounted on the suction bracket; and a suction cylinder, in which a movable piston is disposed, one end of the piston being connected to the drive shaft of the drive member, and one end of the suction cylinder being provided with a suction port, which is connected to the extraction chamber through the second control valve.

[0010] In some specific embodiments, the suction bracket is provided with a fixed base, and the fixed base is provided with a slide rail and a photoelectric switch; a slider is installed on the end of the drive shaft away from the piston, the slider cooperates with the slide rail, and the slider is provided with a detection piece that can trigger the photoelectric switch.

[0011] In some specific embodiments, the suction bracket is further provided with a drive bracket, a connecting plate, and a sealing plate spaced apart, and the drive component is located between the drive bracket and the connecting plate; one end of the suction cylinder is open and the other end is provided with a sealing cap, one end of the suction cylinder abuts against the connecting plate, and the sealing cap is fixed to the sealing plate; the suction unit further includes a tensioning screw and a locking nut, the two ends of the tensioning screw are respectively provided through the drive bracket and the sealing plate, and the locking nut is connected to the tensioning screw and abuts against the drive bracket or the sealing plate.

[0012] In some embodiments, a spherical cavity is provided at the end of the flue gas guide pipe opposite to the first control valve, and a plurality of air holes are provided on the spherical cavity.

[0013] This invention also discloses an online automatic extraction method for mainstream cigarette smoke, using the aforementioned online automatic extraction device for mainstream cigarette smoke. The method includes the following steps: installing an extraction container containing extraction liquid onto an extraction seat; installing multiple first control valves onto a valve seat, with a smoke guide pipe installed at the outlet of each first control valve; installing the extraction seat onto the valve seat, such that one end of each smoke guide pipe is inserted into the extraction container; connecting the extraction unit and the first connecting port of the extraction chamber of the second control valve via a first connecting pipe; opening the second control valve and inserting a cigarette into the valve seat to ignite it; starting the extraction unit, sequentially opening multiple first control valves, ensuring that only one first control valve is open at any given time, while the rest are closed; replacing the cigarette and repeating the above steps.

[0014] In some specific embodiments, after connecting the extraction unit and the extraction chamber of the second control valve through the first connecting pipe, before opening the second control valve and inserting a cigarette into the valve seat to ignite it, the method further includes: The second connecting port of the extraction chamber is connected to the pressure pump via a third control valve through a second connecting pipe. Open multiple first control valves and the third control valve, close the second control valve, start the pressurization pump, and shut down the pressurization pump when the liquid level in the flue gas guide pipe reaches a specified height; If the liquid level does not decrease after closing multiple first control valves and the third control valve for a specified period of time, the second control valve is opened to proceed with subsequent steps. If the liquid level decreases, the extraction is stopped.

[0015] The beneficial effects of this invention are as follows: In actual operation, firstly, the extraction container containing the extractant is installed on the extraction seat; secondly, multiple first control valves are installed on the valve seat, and a flue gas guide pipe is installed at the outlet of each first control valve; then, the extraction seat is installed on the valve seat, and one end of each flue gas guide pipe is inserted into the extraction container; then, the first connecting port of the extraction chamber and the extraction unit are connected through the first connecting pipe; the second control valve is opened, and a cigarette is inserted into the valve seat and lit; then the extraction unit is started, and multiple first control valves are opened in sequence, and at the same time, only one first control valve is open, while the rest are closed. At this time, the flue gas enters the corresponding flue gas guide pipe through the opened first control valve, and forms bubbles from bottom to top through the extractant, so that the particulate matter in the flue gas is fully contacted and extracted by the extractant. Since multiple first control valves are opened in sequence during this process, each puff of flue gas is independently captured, avoiding cross-interference and ensuring accurate differentiation and enrichment of each puff's components. In summary, the automatic extraction device of this invention achieves simultaneous dissolution of all components in the gaseous and particulate phases of cigarette smoke through direct liquid-phase capture, eliminating the need for the use, replacement, or treatment of Cambridge filters, thus avoiding filter adsorption losses and human error. Furthermore, it enables independent collection from each cigarette puff and cyclic enrichment of components from the same puff location across multiple cigarettes during testing, significantly improving the sensitivity for trace substance detection. In actual operation, only manual assembly of the extraction device, installation of a cigarette, and lighting are required. The entire extraction process is automated, greatly improving detection efficiency and data traceability. It is compatible with mainstream analytical platforms such as liquid chromatography, providing high-precision technical support for cigarette harm reduction research and quality control.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the online automatic extraction device for mainstream cigarette smoke according to an embodiment of the present invention; Figure 2 This is a partial structural schematic diagram of the online automatic extraction device for mainstream cigarette smoke according to an embodiment of the present invention; Figure 3 yes Figure 2 An exploded view of the structure shown; Figure 4 yes Figure 2 A cross-sectional view of the structure shown; Figure 5 yes Figure 4 The diagram shown is an enlarged view of point A. Figure 6 This is a schematic diagram of the structure of the air extraction unit according to an embodiment of the present invention; Figure 7 This is a cross-sectional view of the air extraction unit according to an embodiment of the present invention.

[0018] Figure label: 10. Valve seat; 101. Airflow channel; 102. Mounting port; 103. Mounting protrusion; 11. First control valve; 12. Extraction seat; 121. Extraction chamber; 122. First connecting port; 123. Second connecting port; 124. Receiving groove; 13. Extraction container; 14. Flue gas guide pipe; 141. Spherical cavity; 142. Air hole; 15. Extraction unit; 151. Extraction bracket; 152. Driving component; 153. Drive shaft; 154. Extraction cylinder; 155. Piston; 156. Fixed seat; 157. Slide rail; 158. Slider; 15 9. Detection plate; 1510. Drive bracket; 1511. Connecting plate; 1512. Sealing plate; 1513. Sealing cover; 1514. Tensioning screw; 1515. Locking nut; 1516. Transition block; 1517. Connecting block; 16. Second control valve; 161. First opening; 162. Second opening; 163. Third opening; 17. Pressure pump; 18. Third control valve; 19. Cigarette holder; 191. Holder body; 192. Labyrinth ring; 193. Sealing ring; 20. First connecting pipe; 21. Second connecting pipe; 22. Cigarette stick. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In the description of this embodiment, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0022] This invention discloses an online automatic extraction device for mainstream cigarette smoke (hereinafter referred to as the automatic extraction device for ease of description), referenced Figures 1-3As shown, the automatic extraction device includes a valve seat 10, an extraction seat 12, multiple flue gas guide pipes 14, and an extraction unit 15. The valve seat 10 is provided with multiple first control valves 11, an airflow channel 101, and an installation port 102 communicating with the airflow channel 101. The airflow channel 101 is connected to the inlet of the multiple first control valves 11 respectively. The installation port 102 is used to hold the cigarette 22. The extraction seat 12 is sealed to the valve seat 10 and has an extraction chamber 121. The extraction chamber 121 is provided with multiple extraction containers 13 and has a first communication port 122. The multiple flue gas guide pipes 14 are arranged one-to-one with the extraction containers 13. One end of each flue gas guide pipe 14 is inserted into the extraction container 13, and the other end is connected to the outlet of the first control valve 11. The extraction unit 15 is connected to the first communication port 122 through a second control valve 16. Understandably, in actual operation, the extraction container 13 containing the extractant is first installed onto the extraction seat 12; then, multiple first control valves 11 are installed onto the valve seat 10, and a flue gas guide pipe 14 is installed at the outlet of each first control valve 11; next, the extraction seat 12 is installed onto the valve seat 10, with one end of each flue gas guide pipe 14 inserted into the extraction container 13; then, the first connecting port 122 of the extraction chamber 121 is connected to the extraction unit 15 via the first connecting pipe 20; the second control valve 16 is opened, and a cigarette 22 is inserted into the valve. Ignite on seat 10; then start the extraction unit 15, and open multiple first control valves 11 in sequence, keeping only one first control valve 11 open at the same time, while the rest of the first control valves 11 are closed. At this time, the flue gas enters the corresponding flue gas guide pipe 14 through the opened first control valve 11, and forms bubbles from bottom to top through the extractant, so that the particulate matter in the flue gas is fully contacted and extracted by the extractant. Since multiple first control valves 11 are opened in sequence during this process, each flue gas is independently captured, avoiding cross-interference and ensuring accurate differentiation and enrichment of each component. In summary, the automatic extraction device of this invention achieves simultaneous dissolution of all components in the gaseous and particulate phases of cigarette smoke through direct liquid-phase capture, eliminating the need for the use, replacement, or treatment of Cambridge filters, thus avoiding filter adsorption losses and human error. Furthermore, it enables independent collection from each cigarette puff and cyclic enrichment of components from the same puff location across multiple cigarettes during testing, significantly improving the sensitivity for trace substance detection. In actual operation, only manual assembly of the automatic extraction device, installation of the cigarette 22, and lighting are required. The entire extraction process is automated, greatly improving detection efficiency and data traceability. It is compatible with mainstream analytical platforms such as liquid chromatography, providing high-precision technical support for cigarette harm reduction research and quality control.

[0023] Optionally, the second control valve 16 is a three-way valve. The first opening 161 of the three-way valve is connected to the first connecting port 122, the second opening 162 is connected to the extraction unit 15, and the third opening 163 is connected to the gas bag. In actual operation, the filtered flue gas can be drawn into the extraction unit 15 and then discharged to the gas bag for other tests by the opening and closing state of the three-way valve, which is beneficial to expanding the testing methods of the automatic extraction device.

[0024] Optionally, the upper end of the extraction chamber 121 is open, and the valve seat 10 is sealed to the upper end of the extraction chamber 121 to close it. This ensures the sealing performance of the extraction chamber 121, preventing external gas interference during extraction and improving extraction accuracy. It should be noted that the sealing connection method is selected according to actual needs. For example, the valve seat 10 and the extraction seat 12 are connected by screws, with a sealing gasket between them; or, for example, the valve seat 10 has a protrusion, and the extraction seat 12 has a groove, with the protrusion of the valve seat 10 inserted into the groove of the extraction seat 12, and sealant applied to the connection gap to achieve a sealed connection.

[0025] Optionally, the extraction chamber 121 is provided with multiple receiving slots 124, and each receiving slot 124 is provided with an extraction container 13. This ensures the installation stability of the extraction container 13 and avoids mutual interference between the extraction containers 13.

[0026] refer to Figures 1-2As shown, the extraction chamber 121 also includes a second connecting port 123. The second connecting port 123 and the first connecting port 122 are located on two opposite side walls of the extraction seat 12. The automatic extraction device also includes a pressure pump 17 and a liquid level detector (not shown). The second connecting port 123 is connected to the pressure pump 17 through a third control valve 18. The liquid level detector is used to detect the liquid level in the flue gas guide pipe 14. It is understood that in actual operation, if there is a problem with the airtightness of the extraction chamber 121, it will affect the extraction result. Therefore, an airtightness test needs to be performed before the automatic extraction device performs the extraction operation. By setting up the pressure pump 17 and the liquid level detector, before the extraction operation starts, the second connecting port 123 of the extraction chamber 121 is connected to the pressure pump 17 through the third control valve 18 via the second connecting pipe 21. Then, multiple first control valves 11 and third control valves 18 are opened, the second control valve 16 is closed, and the pressure pump 17 is started. The liquid level in the extraction container 13 reaches the specified height (specifically, is...). When the liquid level reaches the position detectable by the level detector, the pressurizing pump 17 is turned off, and multiple first control valves 11 and third control valves 18 are closed. This is maintained for a specified time (e.g., 30 seconds, which can be adjusted according to actual needs). If the liquid level does not drop, it indicates that the extraction chamber 121 has good airtightness. At this time, the second control valve 16 can be opened to perform the extraction operation. If the liquid level drops, it indicates that there is an air leak in the extraction chamber 121, which needs to be checked and extraction cannot be performed. Thus, the pressurizing pump 17 and the level detector can be used to conveniently perform airtightness testing and ensure the extraction effect.

[0027] refer to Figure 4 As shown, a spherical cavity 141 is provided at the end of the flue gas guide pipe 14 opposite to the first control valve 11, and multiple air holes 142 are provided on the spherical cavity 141. It can be understood that providing a spherical cavity 141 at the end of the flue gas guide pipe 14, and providing multiple air holes 142 on the spherical cavity 141, can increase the contact area between the flue gas and the extractant, ensuring that particulate matter and gaseous components in the flue gas are efficiently captured by the extractant.

[0028] refer to Figure 4 and Figure 5 As shown, the valve seat 10 is provided with a mounting protrusion 103 surrounding the mounting port 102. The automatic extraction device also includes a cigarette holder 19, which supports the cigarette 22. It can be understood that, compared to directly inserting the cigarette 22 into the mounting port 102, the added cigarette holder 19 can stably support the cigarette 22, ensuring that the cigarette 22 remains vertical during the extraction process, and avoiding the adverse effects of the cigarette 22 tilting on the extraction effect.

[0029] Optionally, the cigarette holder 19 includes a holder body 191, multiple labyrinth rings 192, and a sealing ring 193. The holder body 191 has a mounting cavity, one end of which is fitted onto a mounting protrusion 103. The multiple labyrinth rings 192 are stacked within the mounting cavity. The cigarette 22 passes through the multiple labyrinth rings 192 and extends out of the other end of the mounting cavity. The sealing ring 193 is located between the side wall of the mounting cavity and the outer side wall of the mounting protrusion 103. Understandably, during actual installation, the multiple labyrinth rings 192 and the sealing ring 193 are installed onto the holder body 191, and the holder body 191 is installed onto the valve seat 10. The sealing ring 193 ensures a tight seal between the mounting protrusion 103 and the holder body 191. The multiple sealing rings 193 support the cigarette 22, ensuring that the cigarette 22 is in a vertical position. The material of the sealing ring 193 can be selected according to actual needs; no limitation is made on the material of the sealing ring 193 here.

[0030] refer to Figures 6-7 As shown, the suction unit 15 includes a suction bracket 151, a drive component 152, and a suction cylinder 154. The drive component 152 is mounted on the suction bracket 151. A movable piston 155 is disposed inside the suction cylinder 154. One end of the piston 155 is connected to the drive shaft 153 of the drive component 152. One end of the suction cylinder 154 is provided with a suction port, which is connected to the extraction chamber 121 through a second control valve 16. It can be understood that during actual operation, after the drive component 152 is activated, the drive shaft 153 can drive the piston 155 to move within the suction cylinder 154, thereby achieving the suction effect on the extraction chamber 121.

[0031] Optionally, the vacuum bracket 151 is made of profiles, which is convenient to manufacture and has a low manufacturing cost.

[0032] Optionally, the drive unit 152 can be selected from cylinders, linear motors, or rotary motors in conjunction with lead screws and nuts, with the lead screw as the drive structure, depending on actual needs.

[0033] Optionally, the suction bracket 151 is equipped with a fixed base 156, on which a slide rail 157 and a photoelectric switch are mounted. A slider 158 is installed on the end of the drive shaft 153 opposite to the piston 155. The slider 158 cooperates with the slide rail 157, and a detection piece 159 capable of triggering the photoelectric switch is provided on the slider 158. Understandably, during actual operation, because the slider 158 is located on the end of the drive shaft 153 opposite to the piston 155, and the slider 158 can cooperate with the slide rail 157 mounted on the fixed base 156, after the drive unit 152 is activated, the drive shaft 153 can only move along the extension direction of the slide rail 157, thereby preventing the piston 155 from jamming due to the misalignment of the drive shaft 153. Simultaneously, during actual operation, when the detection piece 159 triggers the photoelectric switch, the drive unit 152 stops moving, thus limiting the stroke of the piston 155 and preventing the piston 155 from excessively moving and damaging the suction cylinder 154.

[0034] Alternatively, the mounting base 156 is fixed to the suction bracket 151 by screws, and the slide rail 157 is fixed to the mounting base 156 by screws.

[0035] Alternatively, a transition block 1516 may be provided on the fixed base 156. The transition block 1516 is fixed to the fixed base 156 by screws. The transition block 1516 is provided with a mounting groove. One end of the detection piece 159 is inserted into the mounting groove and locked by screws.

[0036] Alternatively, the transition block 1516 may be provided with an L-shaped connecting block 1517. The vertical section of the connecting block 1517 is connected to the transition block 1516 by screws, and one end of the drive shaft 153 passes through the horizontal section and is locked to the horizontal section by two nuts.

[0037] Of course, in other embodiments of the present invention, the connection method of the fixed base 156 and the suction bracket 151, as well as the connection method of the slider 158 and the drive shaft 153, can be adjusted according to actual needs and are not limited to the above description.

[0038] Optionally, the suction bracket 151 is further provided with a drive bracket 1510, a connecting plate 1511, and a sealing plate 1512 spaced apart. The drive component 152 is located between the drive bracket 1510 and the connecting plate 1511. One end of the suction cylinder 154 is open, and the other end is provided with a sealing cap 1513. One end of the suction cylinder 154 abuts against the connecting plate 1511, and the sealing cap 1513 is fixed to the sealing plate 1512. The suction unit 15 also includes a tensioning screw 1514 and a locking nut 1515. The two ends of the tensioning screw 1514 pass through the drive bracket 1510 and the sealing plate 1512 respectively. The locking nut 1515 is connected to the tensioning screw 1514 and abuts against the drive bracket 1510 or the sealing plate 1512. The drive bracket 1510 has an L-shaped plate structure. The vertical section of the L-shaped plate structure is connected to the suction bracket 151 by screws, and the horizontal section is connected to the drive component 152 by screws. Understandably, in the actual assembly process, the drive bracket 1510, drive component 152, connecting plate 1511, vacuum pump 154, and sealing plate 1512 are first assembled into a single structure. Then, the drive bracket 1510 is fixed to the vacuum pump bracket 151. Next, the tension screw 1514 is passed through the horizontal section of the drive bracket 1510 and the sealing plate 1512 and locked by two locking nuts 1515 to ensure that the internal space of the vacuum pump 154 ​​is sealed, thereby ensuring that the drive component 152 can evacuate the extraction chamber 121 when it is started.

[0039] It should be noted that the automatic extraction device also includes a control mechanism, which can be a centralized or distributed controller. For example, the controller can be a single microcontroller or a combination of multiple distributed microcontrollers. The microcontroller can run a control program, thereby enabling the first control valve 11, the second control valve 16, the pressurizing pump 17, and the air extraction unit 15 to perform their respective functions.

[0040] This invention also discloses a method for online automatic extraction of mainstream cigarette smoke puff by puff, which uses the aforementioned online automatic extraction device for mainstream cigarette smoke puff by puff. The method includes the following steps: S1: Install the extraction container 13 containing the extraction liquid onto the extraction seat 12; S2: Install multiple first control valves 11 onto valve seats 10, and install flue gas guide pipes 14 at the outlet of each first control valve 11; S3: Install the extraction seat 12 onto the valve seat 10, such that one end of each flue gas guide pipe 14 is inserted into the extraction container 13; S4: Connect the first connection port 122 of the extraction chamber 121 to the first connecting pipe 20; S5: Open the second control valve 16 and insert a cigarette 22 into the valve seat 10 and light it; S6: Start the air extraction unit 15, open multiple first control valves 11 in sequence, and keep at the same time that only one first control valve 11 is open and the rest of the first control valves 11 are closed. S7: Replace cigarette 22 and repeat the above steps.

[0041] It is understood that the online automatic extraction method for mainstream cigarette smoke of the present invention achieves simultaneous dissolution of all components of gaseous and particulate matter in the smoke through direct liquid-phase capture, avoiding filter adsorption loss and human operation error, supporting independent collection of each puff and cyclic enrichment of components in the same puff of multiple cigarettes, significantly improving the sensitivity of trace substance detection, with a high degree of automation, and can greatly improve detection efficiency and data traceability.

[0042] Optionally, the following steps may be included between step S4 and step S5: S41: The second connection port 123 of the extraction chamber 121 is connected to the pressure pump 17 via the third control valve 18 through the second connecting pipe 21; S42: Open multiple first control valves 11 and third control valves 18, close the second control valve 16, start the pressurization pump 17, and close the pressurization pump 17 when the liquid level in the extraction container 13 reaches the specified height (specifically, the liquid level reaches the position that the liquid level detector can detect). S43: Close multiple first control valves 11 and third control valves 18, and maintain for a specified time (e.g., 30 seconds, which can be adjusted according to actual needs). If the liquid level does not drop, open the second control valve 16 to proceed with subsequent steps. If the liquid level drops, stop extraction.

[0043] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An online automatic extraction device for mainstream cigarette smoke, characterized in that, include: A valve seat (10) is provided with a plurality of first control valves (11). The valve seat (10) is provided with an airflow channel (101) and an installation port (102) communicating with the airflow channel (101). The airflow channel (101) is connected to the inlet of the plurality of first control valves (11) respectively. The installation port (102) is used to carry the cigarette (22). Extraction seat (12), the extraction seat (12) is sealed to the valve seat (10) and has an extraction chamber (121), the extraction chamber (121) is provided with a plurality of extraction containers (13), and the extraction chamber (121) has a first communication port (122); Multiple flue gas guide pipes (14) are provided one-to-one with the extraction container (13). One end of each flue gas guide pipe (14) is inserted into the extraction container (13), and the other end is connected to the outlet of the first control valve (11). An air extraction unit (15) is connected to the first communication port (122) via a second control valve (16).

2. The online automatic extraction device for mainstream cigarette smoke according to claim 1, characterized in that, The extraction chamber (121) further includes a second communication port (123), which is located on two opposite side walls of the extraction seat (12) and the first communication port (122). The cigarette mainstream smoke extraction device further includes a pressure pump (17) and a liquid level detector. The second communication port (123) is connected to the pressure pump (17) through a third control valve (18). The liquid level detector is used to detect the liquid level in the smoke guide pipe (14).

3. The online automatic extraction device for mainstream cigarette smoke according to claim 1, characterized in that, The valve seat (10) is provided with an installation protrusion (103) surrounding the installation port (102). The cigarette mainstream smoke extraction device also includes a cigarette holder (19), which is used to support the cigarette (22).

4. The online automatic extraction device for mainstream cigarette smoke according to claim 3, characterized in that, The cigarette holder (19) includes: The base body (191) has a mounting cavity, one end of which is sleeved on the mounting protrusion (103); Multiple labyrinth rings (192) are stacked in the mounting cavity, and the cigarette (22) passes through the multiple labyrinth rings (192) and extends out of the other end of the mounting cavity; A sealing ring (193) is located between the side wall of the mounting cavity and the outer side wall of the mounting protrusion (103).

5. The online automatic extraction device for mainstream cigarette smoke according to any one of claims 1-4, characterized in that, The air extraction unit (15) includes: Evacuation bracket (151); A drive unit (152) is mounted on the suction bracket (151); A vacuum pump (154) is provided, and a movable piston (155) is provided inside the vacuum pump (154). One end of the piston (155) is connected to the drive shaft (153) of the drive member (152). One end of the vacuum pump (154) is provided with a vacuum port, and the vacuum port is connected to the extraction chamber (121) through the second control valve (16).

6. The online automatic extraction device for mainstream cigarette smoke according to claim 5, characterized in that, The suction bracket (151) is provided with a fixed base (156), and the fixed base (156) is provided with a slide rail (157) and a photoelectric switch; A slider (158) is mounted on the end of the drive shaft (153) away from the piston (155). The slider (158) cooperates with the slide rail (157). A detection piece (159) capable of triggering the photoelectric switch is provided on the slider (158).

7. The online automatic extraction device for mainstream cigarette smoke according to claim 5, characterized in that, The air extraction bracket (151) is also provided with a drive bracket (1510), a connecting plate (1511) and a sealing plate (1512) spaced apart, and the drive component (152) is located between the drive bracket (1510) and the connecting plate (1511). One end of the suction cylinder (154) is open, and the other end is provided with a sealing cap (1513). One end of the suction cylinder (154) abuts against the connecting plate (1511), and the sealing cap (1513) is fixed to the sealing plate (1512). The suction unit (15) also includes a tensioning screw (1514) and a locking nut (1515). The two ends of the tensioning screw (1514) pass through the drive bracket (1510) and the sealing plate (1512) respectively. The locking nut (1515) is connected to the tensioning screw (1514) and abuts against the drive bracket (1510) or the sealing plate (1512).

8. The online automatic extraction device for mainstream cigarette smoke according to any one of claims 1-4, characterized in that, The flue gas guide pipe (14) has a spherical cavity (141) at one end away from the first control valve (11), and the spherical cavity (141) has a plurality of air holes (142).

9. A method for online automatic extraction of mainstream cigarette smoke puff by puff, characterized in that, The method employs the online automatic extraction device for mainstream cigarette smoke as described in any one of claims 1-8, and the online automatic extraction method for mainstream cigarette smoke includes the following steps: Install the extraction container (13) containing the extractant onto the extraction stand (12); Multiple first control valves (11) are mounted on valve seats (10), and a flue gas guide pipe (14) is installed at the outlet of each first control valve (11); The extraction seat (12) is installed on the valve seat (10), and one end of each flue gas guide pipe (14) is inserted into the extraction container (13); The first connecting pipe (20) connects the air extraction unit (15), the second control valve (16) to the first communication port (122) of the extraction chamber (121); Open the second control valve (16) and insert a cigarette (22) into the valve seat (10) and light it; Start the air extraction unit (15) and open multiple first control valves (11) in sequence. At the same time, only one first control valve (11) is open, and the rest of the first control valves (11) are closed. Replace the cigarette (22) and repeat the above steps.

10. The method for automatic online extraction of mainstream cigarette smoke puff by puff according to claim 9, characterized in that, After connecting the suction unit (15), the second control valve (16) and the extraction chamber (121) through the first connecting pipe (20), before opening the second control valve (16) and inserting a cigarette (22) into the valve seat (10) for ignition, the process further includes: The second connection port (123) of the extraction chamber (121) is connected to the pressure pump (17) via the third control valve (18) through the second connecting pipe (21); Open multiple first control valves (11) and third control valves (18), close the second control valve (16), start the pressurization pump (17), and shut down the pressurization pump (17) when the liquid level in the flue gas guide pipe (14) reaches the specified height. Close multiple first control valves (11) and third control valves (18) for a specified time. If the liquid level does not drop, open the second control valve (16) to proceed with subsequent steps. If the liquid level drops, stop extraction.

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