Pretreatment device for analyzing particulate matters in cigarette smoke

Abstract

The utility model discloses a pretreatment device for analyzing particulate matters in cigarette smoke. The pretreatment device comprises a frame, an extraction unit, a sample introduction unit, a suction unit and a controller, and the extraction unit, the sample introduction unit and the suction unit are all mounted on the frame; the extraction unit comprises an upper extraction cavity, a lower extraction cavity and a smoke trap, the smoke trap is used for mounting a filter disc and is hermetically mounted between the upper extraction cavity and the lower extraction cavity, the sampling unit is communicated with the upper extraction cavity so as to convey extract liquor to the upper extraction cavity, the suction unit is communicated with the upper extraction cavity so as to convey the extract liquor to the lower extraction cavity, and the sampling unit is communicated with the lower extraction cavity. Liquid in the upper extraction cavity is sucked and reset; the controller is in communication connection with the extraction unit, the sample introduction unit and the suction unit. According to the pretreatment device for analyzing the particulate matters in the cigarette smoke, the trap does not need to be opened and wiped, the measurement result error caused by a traditional oscillation mode is reduced, the operation is simplified, and the extraction efficiency of analyzing the particulate matters in the cigarette smoke is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pre-processing for analysis of particle phase matter in cigarette smoke, and more specifically to a pre-processing device for analysis of particle phase matter in cigarette smoke. Background Art

[0002] At present, the traditional oscillation method is used to extract the particulate matter in cigarette smoke, that is, open the smoke collector, take out the filter, wipe the smoke collector, put it in a triangular flask, add the extraction solvent and oscillate. However, when opening the smoke collector to take out the filter and manually handling the filter, there are problems such as water loss and incomplete wiping of the adsorbed particulate matter by the smoke collector, which introduces errors in the measurement results of the particulate matter, and the operation steps are cumbersome;

[0003] In addition, the Chinese utility model patent application with publication number CN111366664A discloses an in-situ extraction device and method for total particulate matter in mainstream cigarette smoke, which places a smoke collector in an extraction pool, draws an extraction solvent through a power device to fill the extraction pool, and extracts the smoke collector. After the extraction is completed, the extraction pool is cleaned with inert gas, but the extraction pool is full of extraction liquid, resulting in a waste of extraction liquid. The aperture of the smoke collector is too small, and the filter disc cannot be completely extracted in the extraction pool. Another example is the Chinese utility model patent application with publication number CN113655154A, which discloses an in-situ extraction instrument and test method suitable for measuring moisture in smoke, which connects the upper extraction chamber and the lower extraction chamber to form a passage, and the upper piston and the lower piston reciprocate up and down at the same time, pushing the extraction liquid to circulate and reciprocate between the upper extraction chamber and the lower extraction chamber, so that the circulatory reciprocating flow passes through the smoke collector, but the device uses two upper and lower linear motors as power sources, which is cumbersome to operate and has low efficiency.

[0004] Therefore, it is necessary to solve the above technical problems. Utility Model Content

[0005] In view of this, the purpose of the utility model is to propose a pre-processing device for analyzing particulate matter in cigarette smoke, so as to reduce the measurement result error caused by the traditional oscillation method, simplify the operation, and improve the extraction efficiency of the particulate matter analysis in cigarette smoke.

[0006] Based on the above purpose, the utility model provides a pretreatment device for analyzing particulate matter in cigarette smoke, comprising a frame, an extraction unit, a sampling unit, a suction unit, and a controller, wherein: the extraction unit, the sampling unit, and the suction unit are all installed on the frame; the extraction unit comprises an upper extraction chamber, a lower extraction chamber, and a smoke collector, the smoke collector is used to install a filter, and the smoke collector is sealed and installed between the upper extraction chamber and the lower extraction chamber, the sampling unit is connected to the upper extraction chamber to transport extraction liquid to the upper extraction chamber, the suction unit is connected to the upper extraction chamber, and sucks and resets the liquid in the upper extraction chamber, and the lower extraction chamber is used to hold the extracted solution; the controller is communicatively connected to the extraction unit, the sampling unit, and the suction unit.

[0007] Optionally, the injection unit includes an injection pump and a switching valve, the extraction unit is multiple, the switching valve includes multiple extraction channels, liquid inlet channels, injection ports, and waste liquid channels, the multiple extraction channels are connected to the multiple extraction units one-to-one, the injection pump is connected to the injection port of the switching valve, the liquid inlet channel is used to be connected to the extraction liquid bottle, and the waste liquid channel is used to be connected to the waste liquid bottle.

[0008] Optionally, there are multiple suction units, and the multiple suction units are arranged in a one-to-one correspondence with the extraction units. The suction unit includes an airtight injector and a linear drive mechanism. The outlet of the airtight injector is connected to the upper extraction chamber. The linear drive mechanism drives the airtight injector to reciprocately suck and reset the liquid in the upper extraction chamber. The controller is communicatively connected with the linear drive mechanism.

[0009] Optionally, the linear drive mechanism is an electric slide, which is slidably mounted on the frame, and the airtight injector includes a piston rod and a main body that slides along the piston rod, the piston rod is fixedly mounted on the frame, and the main body is fixedly mounted on the electric slide, and the sliding of the electric slide drives the main body to slide along the piston rod to suck and reset the liquid in the extraction chamber.

[0010] Optionally, a calibration unit is further included, which is installed on the frame. The calibration unit includes a calibration bottle and a calibration connector. The switching valve also includes a calibration channel, which is connected to the injection unit. One end of the calibration connector is connected to the calibration channel, and the other end of the calibration connector is arranged above the calibration bottle. The calibration bottle is used to hold the extraction liquid output from the calibration connector.

[0011] Optionally, a liquid level sensor is provided in the calibration bottle, and the liquid level sensor is communicatively connected to the controller.

[0012] Optionally, the lower extraction chamber includes an adapter, a suction pipe, and a centrifuge tube, the adapter is installed on the frame, the suction pipe is located inside the centrifuge tube, the upper end of the suction pipe is sealed and connected to the top of the adapter, the lower end of the smoke collector is sealed and connected to the top of the adapter, and the upper end of the centrifuge tube is sealed and installed at the bottom of the adapter.

[0013] Optionally, the extraction unit further comprises a suction valve, an upper air pressure valve and a lower air pressure valve, the upper extraction chamber comprises an extraction tube and an extraction cover sealedly mounted on the extraction tube, the extraction cover is provided with an upper air pressure port and a liquid inlet, the liquid inlet is communicated with the extraction channel, the outlet of the airtight injector is communicated with the suction valve, when the suction valve and the upper air pressure valve are both closed, the suction valve is communicated with the upper air pressure valve, the upper air pressure port is communicated with the upper air pressure valve, when the suction valve is opened, the suction valve is communicated with air, when the upper air pressure valve is opened, the upper air pressure valve is communicated with air; a lower air pressure port is provided on the adapter, the lower air pressure port is communicated with the lower air pressure valve, when the lower air pressure valve is opened, the lower air pressure port is communicated with air to allow air to enter the lower extraction chamber, when the lower air pressure valve is closed, the lower air pressure port is disconnected from the air.

[0014] Optionally, a photoelectric switch baffle is provided on the linear drive mechanism, and two photoelectric switches used in conjunction with the photoelectric switch baffle are provided on the frame, and the photoelectric switches are communicatively connected with the controller.

[0015] Optionally, a toggle clamp is provided above the extraction cover, and the toggle clamp is mounted on the frame.

[0016] Optionally, the frame includes two upper and lower limit groove pillars, each of which is a rectangular block structure, and a circular arc-shaped recessed portion matching the extraction tube is provided at the front end of the limit groove pillar to limit the extraction tube.

[0017] Optionally, the bottom of the centrifuge tube is a conical tube bottom that is larger at the top and smaller at the bottom, and the lower end of the suction tube extends into the conical tube bottom.

[0018] The utility model provides a pre-treatment device for analyzing particulate matter in cigarette smoke, comprising a frame, an extraction unit, a sampling unit, a suction unit, and a controller. First, a smoke collector is sealed and installed between an upper extraction chamber and a lower extraction chamber, and the extraction unit, the sampling unit, and the suction unit are all installed on the frame; then, the controller controls the sampling unit to transport the extraction liquid to the extraction chamber; finally, the suction unit performs a reciprocating action of sucking and resetting the liquid in the upper extraction chamber, that is, a combination of positive pressure and negative pressure is used to extract the filter disc, and the extracted solution is collected in the lower extraction chamber. The pre-treatment device for analyzing particulate matter in cigarette smoke provided by the present invention does not need to be opened and wiped when in use, which reduces the measurement result error caused by the traditional oscillation method, simplifies the operation, and improves the extraction efficiency of the analysis of particulate matter in cigarette smoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the purpose and advantages of the present invention, wherein:

[0020] Figure 1 This is a schematic structural diagram of a pre-processing device for analyzing particulate matter in cigarette smoke according to an embodiment of the utility model;

[0021] Figure 2 for Figure 1 A local enlarged view at A in FIG.

[0022] Figure 3 for Figure 1 A local enlarged view at B in FIG.

[0023] Figure 4 This is a front view of a pre-processing device for analyzing particulate matter in cigarette smoke according to an embodiment of the utility model;

[0024] Figure 5 for Figure 4 The cross-sectional view at CC in FIG.

[0025] Figure 6 for Figure 5 A local enlarged view at D in FIG.

[0026] Figure 7 This is a partial structural schematic diagram of a pre-processing device for analyzing particulate matter in cigarette smoke according to an embodiment of the utility model;

[0027] Figure 8 This is a schematic diagram of the structure of a switching valve in a pre-processing device for analyzing particulate matter in cigarette smoke according to an embodiment of the utility model;

[0028] Fig. 9The utility model is a schematic diagram of the installation of a sampling unit, a suction valve, an upper air pressure valve, a lower air pressure valve and a switching valve in a pretreatment device for analyzing particulate matter in cigarette smoke according to an embodiment of the present invention.

[0029] Description of reference numerals:

[0030] 1: frame; 2: extraction unit; 3: injection unit; 4: suction unit; 5: upper extraction chamber; 6: lower extraction chamber; 7: smoke collector; 8: injection pump; 9: switching valve; 10: extraction channel; 11: liquid inlet channel; 12: injection port; 13: waste liquid channel; 14: calibration channel; 15: extraction liquid bottle; 16: waste liquid bottle; 17: gas-tight injector; 18: linear drive mechanism; 19: calibration unit; 20: calibration bottle; 21: calibration connector; 22: suction valve; 23: upper air pressure valve; 2 4: extraction tube; 25: extraction cover; 26: upper air pressure port; 27: liquid inlet; 28: electric slide; 29: photoelectric switch baffle; 30: photoelectric switch; 31: elbow clamp; 32: limit slot support; 33: adapter seat; 34: suction tube; 35: centrifuge tube; 36: conical tube bottom; 37: lower air pressure valve; 38: controller; 39: positioning pin; 40: positioning hole; 41: calibration support; 42: limit seat; 43: fixing plate; 44: rubber head bolt; 45: stand; 46: lower air pressure port. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with the embodiments. The same components are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0032] like Figure 1 , Figure 2 and Figure 6 As shown, the pretreatment device for analyzing particulate matter in cigarette smoke provided by the utility model comprises a frame 1, an extraction unit 2, a sampling unit 3, a suction unit 4, and a controller 38, wherein: the extraction unit 2, the sampling unit 3, and the suction unit 4 are all installed on the frame 1; the extraction unit 2 comprises an upper extraction chamber 5, a lower extraction chamber 6, and a smoke collector 7, the smoke collector 7 is used to install a filter, the smoke collector 7 is sealed and installed between the upper extraction chamber 5 and the lower extraction chamber 6, the sampling unit 3 is connected to the upper extraction chamber 5 to transport the extraction liquid to the upper extraction chamber 5, the suction unit 4 is connected to the upper extraction chamber 5, and sucks and resets the liquid in the upper extraction chamber 5, and the lower extraction chamber 6 is used to hold the extracted solution; the controller 38 is communicatively connected with the extraction unit 2, the sampling unit 3, and the suction unit 4.

[0033] It should be noted that the smoke collector 7 can adopt the existing technology; specifically, a fixing plate 43 can be provided on the frame 1, and the extraction unit 2 is installed on the fixing plate 43; the controller 38 adopts the Advantech ARK-1550 industrial computer in the existing technology, which can be purchased on the market. In addition, according to actual needs, the controller 38 can also adopt PLC, which is also the existing technology; when the liquid moves upward, it is negative pressure suction, and when the liquid moves downward, it is positive pressure reset.

[0034] The utility model provides a pre-treatment device for analyzing particulate matter in cigarette smoke, comprising a frame 1, an extraction unit 2, a sampling unit 3, a suction unit 4, and a controller 38. First, a smoke collector 7 is sealed and installed between an upper extraction chamber 5 and a lower extraction chamber 6, and the extraction unit 2, the sampling unit 3, and the suction unit 4 are all installed on the frame 1; then, the controller 38 controls the sampling unit 3 to deliver the extracting liquid to the extraction chamber 5; finally, the suction unit 4 performs a reciprocating action of sucking and resetting the liquid in the upper extraction chamber 5, that is, a combination of positive pressure and negative pressure is used to extract the filter disc, and the extracted solution is collected in the lower extraction chamber 6 respectively. The pre-treatment device for analyzing particulate matter in cigarette smoke provided by the present invention does not need to open and wipe the smoke collector 7 when in use, which reduces the measurement result error caused by the traditional oscillation method, simplifies the operation, and improves the extraction efficiency of the analysis of particulate matter in cigarette smoke.

[0035] like Figure 8 As shown, the injection unit 3 includes an injection pump 8 and a switching valve 9, there are multiple extraction units 2, and the switching valve 9 includes multiple extraction channels 10, a liquid inlet channel 11, an injection port 12, and a waste liquid channel 13. The multiple extraction channels 10 are connected to the multiple extraction units 2 in a one-to-one correspondence, the injection pump 8 is connected to the injection port 12 of the switching valve 9, the liquid inlet channel 11 is used to be connected to the extraction liquid bottle 15, and the waste liquid channel 13 is used to be connected to the waste liquid bottle 16. It should be noted that the injection pump 8 and the switching valve 9 are both prior art and can be purchased from the market. They can also be an injection pump 8 with a switching valve 9. The injection pump 8 model can be SY03B, and the switching valve 9 model can be M08. Multiple extraction units 2 are fed with liquid in sequence. The center interval of adjacent extraction units 2 is 105 mm, which meets the extraction requirements of the smoke collector 7 with two specifications of filter discs of 44 mm and 92 mm. The injection pump 8 first draws the extraction liquid into the injection pump 8 through the liquid inlet channel 11, and then discharges the waste liquid or the extraction liquid into the waste liquid bottle 16 or the upper extraction chamber 5 through the waste liquid channel 13 or the extraction channel 10. In this embodiment, by switching the switching valve 9, the corresponding channels on the switching valve 9 are connected to the extraction unit 2, the liquid inlet unit, and the waste liquid bottle 16 respectively. Specifically, there can be four extraction units 2 and four extraction channels 10, thereby realizing the convenience of use of the pretreatment device for analyzing particulate matter in cigarette smoke.

[0036] like Figure 5and Figure 7 As shown, there are also multiple suction units 4, and the multiple suction units 4 are arranged one by one with the extraction units 2. The suction unit 4 includes an airtight sample injector 17 and a linear drive mechanism 18. The outlet of the airtight sample injector 17 is connected to the upper extraction chamber 5. The linear drive mechanism 18 drives the airtight sample injector 17 to reciprocately suck and reset the liquid in the upper extraction chamber 5. The controller 38 is communicatively connected with the linear drive mechanism 18. Specifically, the linear drive mechanism 18 can adopt an electric slide 28, a push rod motor, a cylinder, etc.; the airtight sampler 17 is a prior art and can be a 100ml airtight sampler 17; in this embodiment, the airtight sampler 17 sucks and resets the liquid in the upper extraction chamber 5, so that the liquid reciprocates in the upper extraction chamber 5 and the lower extraction chamber 6, that is, a combination of positive pressure and negative pressure is adopted. When the liquid moves upward, it is sucked by negative pressure, and when the liquid moves downward, it is reset by positive pressure. In this process, the extraction liquid is circulated between the upper extraction chamber 5 and the lower extraction chamber 6, and then the filter in the smoke collector 7 is extracted. The extracted liquid is collected by the lower extraction chamber 6, which improves the convenience of extraction of the pretreatment device for analyzing particulate matter in cigarette smoke.

[0037] like Figure 5 As shown, the linear drive mechanism 18 is an electric slide 28, which is slidably mounted on the frame 1, and the airtight sampler 17 includes a piston rod and a body that slides along the piston rod, the piston rod is fixedly mounted on the frame 1, and the body is fixedly mounted on the electric slide 28, and the sliding of the electric slide 28 drives the body to slide along the piston rod to suck and reset the liquid in the extraction chamber. In this embodiment, the sliding of the electric slide 28 drives the body to slide along the piston rod, thereby changing the volume of the body, and then realizing the suction and reset of the liquid in the upper extraction chamber 5, which improves the convenience of use of the pre-treatment device for analyzing particulate matter in cigarette smoke.

[0038] like Figure 1 and Figure 3As shown, it also includes a calibration unit 19, which is installed on the frame 1. The calibration unit 19 includes a calibration bottle 20 and a calibration connector 21. The switching valve 9 also includes a calibration channel 14, which is connected to the injection unit 3. One end of the calibration connector 21 is connected to the calibration channel 14, and the other end of the calibration connector 21 is arranged above the calibration bottle 20. The calibration bottle 20 is used to hold the extraction liquid output from the calibration connector 21. In this embodiment, a calibration pillar 41 is provided on the frame 1. The calibration pillar 41 can be an inverted L-shape. The calibration joint 21 is arranged on the calibration pillar 41. A cylindrical limiting seat 42 is provided on the frame 1. The calibration bottle 20 is placed in the limiting seat 42 to achieve limiting. The calibration joint 21 can be a straight-through joint. The centers of the straight-through joint, the limiting seat 42 and the calibration bottle 20 are located on the same axis to ensure that when the extract is calibrated, the extract falls into the calibration bottle 20. The calibration bottle 20 is selected according to the different specifications of the filter disc. The calibration bottle 20 of the corresponding capacity can be selected. The sampling volume of the extract can be corrected by the calibration unit 19 to ensure the accuracy of the sampling volume of the extract, reduce the deviation of the final result caused by the sampling volume error, and improve the convenience of use of the pretreatment device for analyzing particulate matter in cigarette smoke.

[0039] In one embodiment of the utility model, a liquid level sensor is provided in the calibration bottle 20, and the liquid level sensor is communicatively connected with the controller 38. The liquid level sensor can detect the liquid level in the calibration bottle 20, so that the feed amount of the extraction liquid can be increased or decreased as needed to ensure that the feed amount meets the requirements, thereby improving the ease of use of the pretreatment device for analyzing particulate matter in cigarette smoke.

[0040] like Figure 2 , Figure 6 and Figure 7 As shown, the lower extraction chamber 6 includes an adapter seat 33, a suction pipe 34, and a centrifugal tube 35. The adapter seat 33 is installed on the frame 1, the suction pipe 34 is located inside the centrifugal tube 35, the upper end of the suction pipe 34 is sealed and connected to the top of the adapter seat 33, the lower end of the smoke collector 7 is connected and installed on the top of the adapter seat 33, and the upper end of the centrifugal tube 35 is sealed and installed at the bottom of the adapter seat 33. In this embodiment, in actual application, the centrifuge tube 35 can be disposable, without subsequent cleaning, and can be directly replaced, and installed by threading, which is convenient and quick to use. A notch is set at the front edge of the fixing plate 43, and the adapter 33 is placed in the notch. A pair of positioning pins 39 are set in the notch, and a positioning hole 40 cooperating with the positioning pin 39 is set on the adapter 33. During actual installation, the positioning hole 40 cooperates with the positioning pin 39 to achieve accurate positioning of the adapter 33. The smoke collector 7 is connected and installed between the upper extraction chamber 5 and the lower extraction chamber 6 through the adapter 33, which improves the convenience of use of the pretreatment device for analyzing particulate matter in cigarette smoke.

[0041] like Fig. 9As shown, the extraction unit 2 further includes a suction valve 22, an upper air pressure valve 23 and a lower air pressure valve 37. The upper extraction chamber 5 includes an extraction tube 24 and an extraction cover 25 sealed and installed on the extraction tube 24. The extraction cover 25 is provided with an upper air pressure port 26 and a liquid inlet 27. The liquid inlet 27 is connected to the extraction channel 10. The outlet of the airtight sample injector 17 is connected to the suction valve 22. When the suction valve 22 and the upper air pressure valve 23 are both closed, the suction valve 22 is connected to the upper air pressure valve 23. The upper air pressure port 26 is connected to the upper air pressure valve 23. When the suction valve 22 is opened, the suction valve 22 is connected to the air. When the upper air pressure valve 23 is opened, the upper air pressure valve 23 is connected to the air. The adapter 33 is provided with a lower air pressure port 46. The lower air pressure port 46 is connected to the lower air pressure valve 37. When the lower air pressure valve 37 is opened, the lower air pressure port 46 is connected to the air so that air can enter the lower extraction chamber 6. When the lower air pressure valve 37 is closed, the lower air pressure port 46 is disconnected from the air. In this embodiment, a sealing ring is provided between the extraction tube 24 and the extraction cover 25. By opening or closing the suction valve 22, the upper air pressure valve 23, and the lower air pressure valve 37, the liquid inlet or extraction of the pretreatment device for the analysis of particulate matter in cigarette smoke is realized, and the convenience of use of the pretreatment device for the analysis of particulate matter in cigarette smoke is improved.

[0042] like Figure 7 and Fig. 9 As shown, a photoelectric switch baffle 29 is provided on the linear drive mechanism 18, and two photoelectric switches 30 used in conjunction with the photoelectric switch baffle 29 are provided on the frame 1, and the photoelectric switches 30 are communicatively connected with the controller 38. In this embodiment, the travel of the linear drive mechanism 18 can be limited by the coordinated use of the photoelectric switch baffle 29 and the two photoelectric switches 30, thereby improving the reliability of the pre-processing device for analyzing particulate matter in cigarette smoke.

[0043] like Figure 2 and Figure 6 As shown, a toggle clamp 31 is provided above the extraction cover 25, and the toggle clamp 31 is installed on the frame 1. In this embodiment, a stand 45 is provided on the frame 1, and the toggle clamp 31 is installed on the stand 45. The toggle clamp 31 contacts the extraction tube 24 cover through the rubber head bolt 44, thereby tightening the connection between the upper extraction chamber 5, the lower extraction chamber 7 and the smoke collector 6, thereby improving the structural stability of the pre-treatment device for analyzing particulate matter in cigarette smoke.

[0044] like Figure 2 and Figure 6As shown, the frame 1 includes two upper and lower limit groove pillars 32, the limit groove pillars 32 are rectangular block structures, and the front end of the limit groove pillars 32 is provided with a circular arc-shaped recessed portion matching the extraction tube 24 to limit the extraction tube 24. In this embodiment, a stand 45 is provided on the frame 1, and the limit groove pillars 32 are installed on the stand 45. The limit groove pillars 32 limit the side of the extraction tube 24 in the upper extraction chamber 5, which can effectively prevent the extraction tube 24 from being lateral misaligned in actual application, and can provide limit support for the installation of the extraction tube 24, which is convenient and quick to install, and improves the structural stability of the pre-treatment device for analyzing particulate matter in cigarette smoke.

[0045] like Figure 2 and Figure 6 As shown, the bottom of the centrifuge tube 35 is a conical tube bottom 36 with a larger top and a smaller bottom, and the lower end of the suction tube 34 extends into the conical tube bottom 36. In this embodiment, the outer bottom of the centrifuge tube 35 can be a circular flat bottom to ensure that it can be placed upright on a plane; a sealing ring is provided between the top of the centrifuge tube 35 and the adapter 33, and the centrifuge tube 35 is a cylindrical shape with an open top; the lower end of the suction tube 34 is extended into the centrifuge tube 35 with the conical tube bottom 36, which can ensure that the extractant enters the bottom of the lower extraction chamber 6 more smoothly, thereby improving the convenience of use of the pretreatment device for analyzing particulate matter in cigarette smoke.

[0046] In one embodiment of the utility model, there may be four extraction units 2, four suction units 4, and four extraction channels 10 on the switching valve 9. The pretreatment device for analyzing particulate matter in cigarette smoke may be portable and placed on a desktop to save production costs.

[0047] In one embodiment of the present invention, the extraction method for particulate matter analysis comprises the following steps:

[0048] S1, preparation stage: install the smoke collector 7 to be extracted on the extraction unit 2; specifically, place the adapter 33 on the fixing plate 43, install the smoke inlet end of the smoke collector 7 vertically downward on the adapter 33, put the extraction tube 24 on the upper end of the smoke collector 7, install the extraction cover 25 on the upper end of the extraction tube 24, adjust the toggle clamp 31 to press the entire extraction unit 2, and screw the centrifuge tube 35 on the adapter 33;

[0049] S2, automatic liquid inlet preparation: the control unit controls the sample injection unit 3 to absorb the extraction liquid, and then transports it to the extraction unit 2 through the pipeline, and stops transporting when the pipeline is full of the extraction liquid; specifically: the switching valve 9 switches to the liquid inlet channel 11 to draw 5 ml of extraction liquid, and then removes the extraction liquid from the selected 1-4 channels to ensure that the selected pipeline is full of extraction liquid and eliminate the error caused by the pipeline;

[0050] Before the automatic liquid injection in step S3, the device can be calibrated and calibrated. The specific calibration process is as follows: the switching valve 9 switches to the liquid inlet channel 11 to extract the extract required for the filter disc (20 ml of extract required for a 44 mm filter disc, 50 ml of extract required for a 92 mm filter disc), the switching valve 9 switches to the calibration channel 14, the injection pump 8 is reset, and the extract is discharged into the calibration bottle 20, the capacity of the calibration bottle 20 is read and input into the controller 38, the calibration coefficient is calculated, and sent to the controller 38, if the read capacity is less than the standard, the injection volume is increased, if the read capacity is more than the standard, the injection volume is reduced to ensure that the injection volume meets the requirements, after the calibration is completed, the injection unit 3 automatically injects liquid according to the sent calibration coefficient. Alternatively, the above-mentioned injection volume can also be determined by setting a liquid level sensor in the calibration bottle 20 for full-automatic calibration;

[0051] S3, automatic liquid inlet: the control unit controls the injection unit 3 to absorb the extract, and then delivers the absorbed extract to the extraction unit 2; specifically: when the upper air pressure valve 23, the suction valve 22 and the lower air pressure valve 37 are closed, the suction unit 4 and the upper extraction chamber 5, the lower extraction chamber 6 and the smoke collector 7 form a closed space, when the upper air pressure valve 23 is opened, the upper extraction chamber 5 is connected to the air, when the suction valve 22 is opened, the suction valve 22 is connected to the air, and when the lower air pressure valve 37 is opened, the lower extraction chamber 6 is connected to the air. The injection pump 8 extracts the required volume of extract, the lower air pressure valve 37 is opened, the injection pump 8 is reset to discharge the extract into the extraction tube 24 through the liquid inlet 27, after the reset is completed, the upper air pressure valve 23 is opened, and it is closed after a delay of 5s to ensure that the extract flows into the centrifuge tube 35, and it is determined whether the 1-4 extraction channels 10 have completed the liquid inlet. If the liquid inlet is completed, the lower air pressure valve 37 is closed and the liquid inlet is completed. If not, continue to fill other channels with liquid;

[0052] S4, automatic extraction: the control unit controls the extraction unit 2 to work, and the extraction unit 2 extracts the smoke collector 7, and the extraction ends when the extraction time is reached; specifically: the suction unit 4 performs suction and reset actions, and repeats this process until the extraction time is reached and the extraction ends. When the lower air pressure valve 37 is opened, the suction unit 4 is pressed down, and the extracted liquid is pressed into the centrifuge tube 35 through the suction unit 4 for subsequent chromatographic analysis. When the suction valve 22 is opened, the suction unit 4 sucks and then resets to enable subsequent testing. Then the upper air pressure valve 23 is opened, and closed after a delay of 20s. Finally, the suction valve 22 and the lower air pressure valve 37 are closed to ensure that there is no accumulated liquid in the pipeline; the extraction time is 0-60 minutes, and the extraction frequency is 4-10 times / minute; after the extraction is completed, the solution to be tested is obtained in the centrifuge tube 35, and the solution to be tested in the centrifuge tube 35 is poured into a chromatographic injection bottle for subsequent chromatographic analysis;

[0053] S5. Cleaning: disassemble the extraction unit 2, clean the parts that need to be cleaned with alcohol, including the upper extraction chamber 5, the lower extraction chamber 26, and the fume collector 7, and then clean them with clean water, pouring out excess water; put the cleaned parts into an oven to dry, the baking temperature is 50°C, and the time is 60 minutes; then put the dried parts into a drying dish to cool, and the cooling time is not less than 30 minutes.

[0054] Through the above process, the particulate matter in cigarette smoke can be extracted quickly and accurately, and its repeatability and reproducibility are good. In this embodiment, first, the smoke collector 7 is sealed and installed between the upper extraction chamber 5 and the lower extraction chamber 6, and the extraction unit 2, the sampling unit 3, and the suction unit 4 are all installed on the frame 1; then, the switching valve 9 is switched to the liquid inlet channel 11, and the controller 38 controls the sampling unit 3 to absorb the extraction liquid, and then the switching valve 9 is switched to multiple extraction channels 10 in turn, and the extraction liquid is delivered to multiple upper extraction chambers 5 in turn; finally, the suction unit 4 performs a reciprocating action of sucking and resetting the liquid in the multiple upper extraction chambers 5 in turn, that is, a combination of positive pressure and negative pressure is used to extract multiple filter discs, and the extracted solutions are collected in multiple lower extraction chambers 6 respectively. The pretreatment device for analyzing particulate matter in cigarette smoke provided by the utility model does not need to open and wipe the smoke collector 7 when in use, which reduces the measurement result error caused by the traditional oscillation method, simplifies the operation, and improves the extraction efficiency of the analysis of particulate matter in cigarette smoke.

[0055] The utility model provides a pre-treatment device for analyzing particulate matter in cigarette smoke, comprising a frame 1, an extraction unit 2, a sampling unit 3, a suction unit 4, and a controller 38. First, a smoke collector 7 is sealed and installed between an upper extraction chamber 5 and a lower extraction chamber 6, and the extraction unit 2, the sampling unit 3, and the suction unit 4 are all installed on the frame 1; then, the controller 38 controls the sampling unit 3 to deliver the extracting liquid to the extraction chamber 5; finally, the suction unit 4 performs a reciprocating action of sucking and resetting the liquid in the upper extraction chamber 5, that is, a combination of positive pressure and negative pressure is used to extract the filter disc, and the extracted solution is collected in the lower extraction chamber 6 respectively. The pre-treatment device for analyzing particulate matter in cigarette smoke provided by the present invention does not need to open and wipe the smoke collector 7 when in use, which reduces the measurement result error caused by the traditional oscillation method, simplifies the operation, and improves the extraction efficiency of the analysis of particulate matter in cigarette smoke.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A pre-processing device for analyzing particulate matter in cigarette smoke, characterized in that: It includes a frame, an extraction unit, a sampling unit, a suction unit, and a controller, wherein: The extraction unit, the injection unit, and the suction unit are all mounted on the frame; The extraction unit comprises an upper extraction chamber, a lower extraction chamber, and a smoke collector, wherein the smoke collector is used to install a filter, and the smoke collector is sealed and installed between the upper extraction chamber and the lower extraction chamber, the injection unit is connected with the upper extraction chamber to transport the extraction liquid to the upper extraction chamber, the suction unit is connected with the upper extraction chamber, and sucks and resets the liquid in the upper extraction chamber, and the lower extraction chamber is used to hold the extracted solution; The controller is in communication connection with the extraction unit, the injection unit, and the suction unit.

2. The pre-processing device for analyzing particulate matter in cigarette smoke according to claim 1, characterized in that: The injection unit includes a syringe pump and a switching valve. There are multiple extraction units. The switching valve includes multiple extraction channels, liquid inlet channels, injection ports, and waste liquid channels. The multiple extraction channels are connected to the multiple extraction units in a one-to-one correspondence. The syringe pump is connected to the injection port of the switching valve. The liquid inlet channel is used to be connected to the extraction liquid bottle, and the waste liquid channel is used to be connected to the waste liquid bottle.

3. The pre-processing device for analyzing particulate matter in cigarette smoke according to claim 2, characterized in that: There are also multiple suction units, and the multiple suction units are arranged in a one-to-one correspondence with the extraction units. The suction unit includes an airtight sampler and a linear drive mechanism. The outlet of the airtight sampler is connected to the upper extraction chamber. The linear drive mechanism drives the airtight sampler to reciprocately suck and reset the liquid in the upper extraction chamber. The controller is communicatively connected with the linear drive mechanism.

4. The pre-processing device for analyzing particulate matter in cigarette smoke according to claim 3, characterized in that: The linear drive mechanism is an electric slide, which is slidably mounted on the frame. The airtight injector includes a piston rod and a body that slides along the piston rod. The piston rod is fixedly mounted on the frame, and the body is fixedly mounted on the electric slide. The sliding of the electric slide drives the body to slide along the piston rod to suck and reset the liquid in the extraction chamber.

5. The pre-processing device for analyzing particulate matter in cigarette smoke according to claim 2, characterized in that: It also includes a calibration unit, which is installed on the frame. The calibration unit includes a calibration bottle and a calibration connector. The switching valve also includes a calibration channel, which is connected to the injection unit. One end of the calibration connector is connected to the calibration channel, and the other end of the calibration connector is arranged above the calibration bottle. The calibration bottle is used to hold the extraction liquid output from the calibration connector.

6. The pre-processing device for analyzing particulate matter in cigarette smoke according to claim 5, characterized in that: A liquid level sensor is arranged in the calibration bottle, and the liquid level sensor is communicatively connected with the controller.

7. The pre-processing device for analyzing particulate matter in cigarette smoke according to claim 3, characterized in that: The lower extraction chamber includes an adapter, a suction pipe, and a centrifugal tube. The adapter is installed on the frame, the suction pipe is located inside the centrifugal tube, the upper end of the suction pipe is sealed and connected to the top of the adapter, the lower end of the smoke collector is sealed and connected to the top of the adapter, and the upper end of the centrifugal tube is sealed and installed at the bottom of the adapter.

8. The pre-processing device for analyzing particulate matter in cigarette smoke according to claim 7, characterized in that: The extraction unit also includes a suction valve, an upper air pressure valve and a lower air pressure valve. The upper extraction chamber includes an extraction tube and an extraction cover sealed and installed on the extraction tube. The extraction cover is provided with an upper air pressure port and a liquid inlet. The liquid inlet is connected to the extraction channel. The outlet of the airtight injector is connected to the suction valve. When the suction valve and the upper air pressure valve are both closed, the suction valve is connected to the upper air pressure valve, and the upper air pressure port is connected to the upper air pressure valve. When the suction valve is opened, the suction valve is connected to the air. When the upper air pressure valve is opened, the upper air pressure valve is connected to the air. A lower air pressure port is provided on the adapter. The lower air pressure port is connected to the lower air pressure valve. When the lower air pressure valve is opened, the lower air pressure port is connected to the air so that air is introduced into the lower extraction chamber. When the lower air pressure valve is closed, the lower air pressure port is disconnected from the air.

9. The pre-processing device for analyzing particulate matter in cigarette smoke according to claim 3, characterized in that: The linear drive mechanism is provided with a photoelectric switch baffle, the frame is provided with two photoelectric switches used in conjunction with the photoelectric switch baffle, and the photoelectric switches are communicatively connected with the controller.

10. The pre-processing device for analyzing particulate matter in cigarette smoke according to claim 8, characterized in that: A toggle clamp is arranged above the extraction cover and is mounted on the frame.

11. The pre-processing device for analyzing particulate matter in cigarette smoke according to claim 8, characterized in that: The frame comprises two upper and lower limiting groove pillars, the limiting groove pillars are rectangular block structures, and the front ends of the limiting groove pillars are provided with arc-shaped recessed parts matching the extraction tube to achieve the limiting of the extraction tube.

12. The pre-processing device for analyzing particulate matter in cigarette smoke according to claim 7, characterized in that: The bottom of the centrifuge tube is a conical tube bottom that is larger at the top and smaller at the bottom, and the lower end of the suction tube extends into the conical tube bottom.

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