Device for detecting micro-plastics in atmosphere

Abstract

The invention provides a device for detecting micro-plastics in atmosphere. The device comprises a detection equipment main body, a mounting plate, a collection assembly, a cleaning box, a cleaning device and a lifting device, the mounting plate sleeves and is fixedly mounted on the detection equipment main body; the collecting assembly comprises a sampling box, a sucking pump, a collecting pipe, an air inlet pipe and a first valve, the sampling box is mounted on the mounting plate, the detection end of the detection equipment main body extends into the sampling box, the sucking pump is mounted on the sampling box, and the collecting pipe is mounted at the input end of the sucking pump. According to the device for detecting the micro-plastics in the atmosphere, the collecting device is arranged on the detection equipment main body, the to-be-detected sample is sucked into the sampling box through the sucking pump, and the detection equipment main body directly detects the detection sample in the detection box, so that a collecting assembly and the detection equipment can be combined for use, and the detection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of microplastic detection, and in particular to a device for detecting microplastics in the atmosphere. Background Art

[0002] Microplastic particles are tiny in diameter (<=5mm). They can come from the degradation of various plastic products in the environment, emissions from industrial production processes, and additions to personal care products. Microplastics exist in river water, soil, and air. Microplastics float in the atmosphere and are harmful to human health when inhaled. Therefore, it is necessary to detect microplastics in the air, especially in environments where plastic products are produced or processed.

[0003] The detection equipment for microplastics in the existing technology includes LIBS-based detectors, Raman spectrometers, etc. Compared with other detection equipment, the use of the above-mentioned detection equipment does not require additional sample processing, and the samples can be directly detected and analyzed through the above-mentioned detection equipment. However, it is still necessary to use a separate collection device to collect the samples to be tested, and then use the above-mentioned detection equipment for detection. There is still room for further improvement in how to combine the sampling equipment with the detection equipment.

[0004] Therefore, it is necessary to provide a device for detecting microplastics in the atmosphere to solve the above technical problems. Summary of the invention

[0005] The present invention provides a device for detecting microplastics in the atmosphere, which solves the problem in the prior art that the device for detecting microplastics in the atmosphere combines a sampling device with a LIBS detection device and still has room for further improvement.

[0006] In order to solve the above technical problems, the present invention provides a device for detecting microplastics in the atmosphere, comprising: a detection device body, a mounting plate, a collection component, a cleaning box, a cleaning device and a lifting device;

[0007] The mounting plate is sleeved and fixedly mounted on the detection device body;

[0008] The collection assembly includes a sampling box, an air pump, a collection tube, an air inlet pipe and a first valve, the sampling box is mounted on the mounting plate, the detection end of the detection device body extends to the interior of the sampling box, the air pump is mounted on the sampling box, the collection tube is mounted on the input end of the air pump, the air inlet pipe connects the output end of the air pump and the sampling box, the first valve is mounted on the air inlet pipe, an exhaust pipe is mounted at the bottom of the sampling box, and a second valve is provided on the exhaust pipe;

[0009] The cleaning box is connected and installed at the bottom of the sampling box, and a sealing plate is detachably provided on the sampling box, and the sealing plate is used to seal the cleaning box;

[0010] The cleaning device is arranged inside the cleaning box, the lifting device is arranged adjacent to the sampling box, and the output end of the lifting device passes through the bottom of the cleaning box and is connected to the cleaning device;

[0011] The air inlet pipe and the exhaust pipe are both provided with a gas flow sensor.

[0012] Preferably, the sealing plate is slidably mounted inside the sampling box, and one end of the sealing plate away from the detection device body passes through the sampling box and extends to the outside of the sampling box.

[0013] Preferably, the cleaning device includes a mounting member and a first cleaning sponge, the mounting member is slidably mounted inside the cleaning box, the first cleaning sponge is mounted on the mounting member and faces the detection equipment body, and the output end of the lifting device passes through the cleaning box and is connected to the mounting member.

[0014] Preferably, the cleaning device also includes a sealing cylinder and a rotating device, the mounting member includes a mounting shaft and a liquid storage cylinder, one end of the liquid storage cylinder is mounted on the mounting shaft, the first cleaning sponge is connected to the interior of the liquid storage cylinder, one end of the sealing cylinder is arranged inside the liquid storage cylinder, the other end of the sealing cylinder passes through the liquid storage cylinder and extends to the outside of the liquid storage cylinder, the sealing cylinder is used to separate the first cleaning sponge and the cleaning liquid, a strip hole is provided on the sealing cylinder, the rotating device is used to drive the sealing 5 to rotate, and the mounting shaft is mounted at the output end of the lifting device.

[0015] Preferably, the rotating device includes a connecting sleeve, a driving block and a coil spring, the connecting sleeve is installed at the other end of the liquid storage cylinder, the coil spring is sleeved on the blocking cylinder, the coil spring connects the connecting sleeve and the blocking cylinder, the driving block is installed on the blocking cylinder, and a block is installed on the inner wall of the cleaning box, and the block is located below the driving block.

[0016] Preferably, the cleaning device further comprises a second cleaning sponge and a rotating device, the first cleaning sponge and the second cleaning sponge are respectively mounted on both sides of the liquid storage cylinder, the liquid storage cylinder is rotatably mounted on the mounting shaft, and the rotating device is used to drive the liquid storage cylinder to rotate.

[0017] Preferably, the rotating device includes a gear and a one-way bearing, and the gear is mounted on the liquid storage cylinder through the one-way bearing. The device for detecting microplastics in the atmosphere also includes a toothed plate, and the toothed plate is mounted on the top of the inner wall of the sampling box and is located above the gear.

[0018] Preferably, the sampling box is rotatably mounted on the mounting plate, and the device for detecting microplastics in the atmosphere also includes a positioning member, which includes a mounting block, a positioning pin and a driving handle. The mounting block is mounted on the bottom of the mounting plate, one end of the positioning pin passes through the mounting block, and the other end of the positioning pin passes through the cleaning box. The driving handle is mounted on the positioning pin and is located between the cleaning box and the mounting block.

[0019] Preferably, the lifting device includes a lifting cylinder, a connecting rod, a connecting frame and two driving blocks. The lifting cylinder is installed on the mounting plate through a bracket, one end of the connecting rod eccentrically penetrates the bottom of the cleaning box and is connected to the cleaning device, the connecting frame is connected to the other end of the connecting rod, the output end of the lifting cylinder penetrates the connecting frame, the two driving blocks are installed at the output end of the lifting cylinder and are located on both sides of the connecting frame, and the spacing between the two driving blocks is greater than the thickness of the connecting frame, a socket is provided on the connecting rod, and the socket is aligned with the positioning pin. When the driving handle is pushed to drive one end of the positioning pin to separate from the mounting block, the other end of the positioning pin is inserted into the socket.

[0020] Preferably, a convex piece is provided inside the sampling box.

[0021] Compared with the related art, the device for detecting microplastics in the atmosphere provided by the present invention has the following beneficial effects:

[0022] The present invention provides an atmospheric microplastic detection device. When detecting the content of microplastics in the air of a test environment, a staff member can hold the atmospheric microplastic detection device in the test environment, and then start an air pump to draw the air in the test environment into a sampling box. When pumping air, a first valve and a second valve can be opened so that the air to be tested can enter the sampling box through an air inlet pipe and be discharged from an exhaust pipe. After a period of time, the second valve and the first valve are closed in turn, so that the initial air in the sampling box can be discharged, so that the air in the sampling box belongs to the gas of the current test environment. Then, a detection device body is started, and a detection end of the detection device body detects the air in the sampling box to detect the content and type of microplastics in the air, so that the collection component can be used in combination with the detection device to improve the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of a preferred embodiment of the device for detecting microplastics in the atmosphere provided by the present invention;

[0024] Figure 2 A cross-sectional view of the sampling box provided by the present invention;

[0025] Figure 3A schematic diagram of the structure of the cleaning device provided by the present invention;

[0026] Figure 4 This is a schematic diagram of the use status of the plugging tube provided by the present invention, wherein: Figure 4 (a) is a schematic diagram showing that the strip-shaped hole on the plugging cylinder and the first cleaning sponge are staggered. Figure 4 (b) is a schematic diagram showing that the strip-shaped hole on the plugging cylinder is aligned with the first cleaning sponge;

[0027] Figure 5 for Figure 2 An enlarged schematic diagram of section A is shown;

[0028] Figure 6 This is a schematic diagram of the use status of the cleaning device provided by the present invention, wherein: Figure 6 (a) is a schematic diagram of the lifting device pushing down the cleaning device to make the driving block and the stop block work. Figure 6 (b) is a schematic diagram of the lifting device driving the cleaning device to clean the detection end of the detection device body, Figure 6 (c) is a schematic diagram showing the action of the gear and the toothed plate to drive the liquid storage cylinder to flip and switch the positions of the first cleaning sponge and the second cleaning sponge;

[0029] Figure 7 for Figure 6 (a) is an enlarged schematic diagram of part B shown;

[0030] Figure 8 for Figure 1 A schematic diagram of another perspective of the device for detecting microplastics in the atmosphere is shown;

[0031] Fig. 9 This is a schematic diagram of the use state of the positioning member provided by the present invention, wherein: Fig. 9 (a) is a schematic diagram of the connection between the positioning pin and the mounting block. Fig. 9 (b) is a schematic diagram of the positioning pin being separated from the mounting block and inserted into the socket;

[0032] Fig.10 A schematic diagram of the swing of the sampling box provided by the present invention, wherein: Fig.10 (a) is a schematic diagram of the sampling box swinging clockwise. Fig.10 (b) is a schematic diagram of the sampling box swinging counterclockwise.

[0033] Numbers in the figure:

[0034] 1. Main body of the testing equipment;

[0035] 2. Mounting plate;

[0036] 3. Collection component; 31. Sampling box; 32. Air pump; 33. Collection tube; 34. Air inlet pipe; 35. First valve;

[0037] 311, exhaust pipe; 312, second valve; 313, sealing plate; 314, convex piece;

[0038] 4. lifting device; 41. lifting cylinder; 42. connecting rod; 43. connecting frame; 44. driving block;

[0039] 421, jack;

[0040] 5. Cleaning box; 51. Stopper;

[0041] 6. Positioning member; 61. Mounting block; 62. Positioning pin; 63. Driving handle;

[0042] 7. Cleaning device; 71. Mounting member; 72. First cleaning sponge; 73. Second cleaning sponge; 74. Rotating device; 75. Blocking cylinder; 76. Rotating device; 751. Strip hole;

[0043] 711, mounting shaft; 712, liquid storage cylinder; 722, sealing cover;

[0044] 741, connecting sleeve; 742, driving block; 743, coil spring;

[0045] 761, gear; 762, one-way bearing;

[0046] 8. Tooth plate, 9. Gas flow sensor. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] The invention provides a device for detecting microplastics in the atmosphere.

[0049] First embodiment

[0050] Please refer to Figure 1 In one embodiment of the present invention, the device for detecting microplastics in the atmosphere comprises: a detection device body 1, a mounting plate 2, a collection component 3, a cleaning box 5, a cleaning device 7 and a lifting device 4;

[0051] The mounting plate 2 is sleeved and fixedly mounted on the detection device body 1;

[0052] The collection assembly 3 includes a sampling box 31, an air pump 32, a collection tube 33, an air inlet pipe 34 and a first valve 35. The sampling box 31 is mounted on the mounting plate 2. The detection end of the detection device body 1 extends to the interior of the sampling box 31. The air pump 32 is mounted on the sampling box 31. The collection tube 33 is mounted on the input end of the air pump 32. The air inlet pipe 34 connects the output end of the air pump 32 and the sampling box 31. The first valve 35 is mounted on the air inlet pipe 34. An exhaust pipe 311 is mounted at the bottom of the sampling box 31. A second valve 312 is provided on the exhaust pipe 311.

[0053] The cleaning box 5 is connected and installed at the bottom of the sampling box 31. The sampling box 31 is detachably provided with a sealing plate 313, and the sealing plate 313 is used to seal the cleaning box 5;

[0054] The cleaning device 7 is arranged inside the cleaning box 5, the lifting device 4 is arranged adjacent to the sampling box 31, and the output end of the lifting device 4 passes through the bottom of the cleaning box 5 and is connected to the cleaning device 7;

[0055] The air intake pipe 34 and the exhaust pipe 311 are both provided with a gas flow sensor 9 .

[0056] In the present embodiment, the device for detecting microplastics in the atmosphere is mainly used to detect environments where there may be a large amount of microplastics in the air, such as processing plants where plastics are produced or processed, or in experiments for testing microplastics in the atmospheric environment.

[0057] When detecting the content of microplastics in the air in the environment to be tested, the staff can hold the microplastic detection device in the atmosphere and place it in the environment to be tested, and then start the vacuum pump 32 to draw the air in the environment to be tested into the sampling box 31. When pumping air, the first valve 35 and the second valve 312 can be opened to allow the air to be tested to continuously enter the sampling box 31 through the air inlet pipe 34 and then be discharged from the exhaust pipe 311. After a period of time, the second valve 312 and the first valve 35 are closed in turn, so that the initial air in the sampling box 31 can be discharged, so that the air in the sampling box 31 belongs to the gas of the current test environment, and then the detection device body 1 is started, and the detection end of the detection device body 1 detects the air in the sampling box 31 to detect the content and type of microplastics in the air, so that the collection component 3 can be used in combination with the detection equipment to improve the detection efficiency.

[0058] Furthermore, during the testing, samples can be collected and tested multiple times on the environment to be tested.

[0059] Among them, gas flow sensors are correspondingly arranged on the air inlet pipe 34 and the exhaust pipe 311, so as to record the volume of gas entering into the sampling box 31 and the volume of gas discharged, and use the difference to calculate the volume of gas detected in the sampling box 31, so as to calculate the concentration ratio of microplastics per gas unit.

[0060] Please refer to Figure 1 and Figure 8 A handle is provided on the detection device body 1 for the convenience of the staff to hold it. A control screen is provided at the end of the detection device body 1 away from the detection end, which can be used for parameter setting, data display, etc.

[0061] As an optional method of this embodiment, the detection device body 1 adopts a Raman spectrometer, preferably a handheld Raman spectrometer, which generates a specific Raman scattering spectrum based on the interaction between laser and microplastic molecules. The chemical composition and structural characteristics of microplastics in the air can be determined by analyzing the spectrum.

[0062] As another optional method of this embodiment, the detection equipment body 1 mainly includes a laser generation system, a signal detection system and a spectral analysis system; the laser generation system uses a high-energy pulsed laser to focus on the sample to generate a high-temperature, high-pressure plasma; subsequently, by analyzing the specific wavelength of light emitted during the cooling process of the plasma, the type and relative content of elements present in the sample can be determined; the signal detection system is used to collect and transmit spectral signals, etc.; the spectral analysis system processes the spectral data and performs elemental analysis.

[0063] Among them, the spectral analysis system uses PCA dimensionality reduction combined with BP-ANN to classify and track various microplastics in the atmospheric environment.

[0064] PCA is a method for compressing data information. Its main purpose is to map high-dimensional data to low-dimensional space, and to determine the main differences between several groups of data while retaining important information in the data. Use PCA for mathematical analysis: select full spectrum data from 200nm to 885nm. A total of 100 groups of high signal-to-noise ratio data were selected from 1000 groups of spectral data of microplastics detected in each sample. In order to reflect the randomness of the experiment, 50 groups were randomly selected for PCA classification. Among them, the cumulative contribution rate of PC1+PC2+PC3 reached 74.25%. It can be considered that these samples contain sufficient original information under the PCA model of the current principal component composition.

[0065] BP-ANN is a back propagation neural network model that identifies and classifies microplastic types in the atmosphere. BP-ANN includes: Input Layer, Hidden Layer, and Output Layer. The Input Layer first accepts the input of external data and numbers them, numbers them according to a certain ratio, and uses the BP-ANN algorithm to classify 200 samples. 80% of the 200 data sets are training sets and 20% are test sets. The Hidden Layer then performs nonlinear transformation of the data. The training set is used to train the parameters of the neural network, and the test set is used to reflect the quality of the results. The number of hidden layers and the number of neurons can be determined according to specific problems. In order to improve the stability of the verification results and maximize the recognition accuracy, the original BP-ANN is performed to determine the number of hidden neurons in the hidden layer 4 and a 10-fold cross validation is performed to eliminate the influence of the acquisition sequence on the results. The Output Layer is finally used to output the prediction results. By inputting a large amount of data, reliable recognition accuracy is obtained.

[0066] After or before the test, the cleaning device 7 can be pushed by the lifting cylinder 41 to clean the detection end of the detection device body 1 to prevent impurities such as microplastics or dust in the air sample from adhering to the detection head of the detection device body 1, affecting the operation of the detection device (such as possibly causing increased scattering or absorption of the laser beam, affecting the energy transmission and focusing accuracy of the laser, thereby reducing the sensitivity and resolution of the detection), and may cause cross contamination to subsequent tests, resulting in errors in the test results;

[0067] At the same time, when the detection device is in a non-detection air environment, the vacuum pump 32 is started to discharge the gas inside the sampling box 31 through the exhaust pipe 311, so as to further avoid interference with subsequent detection.

[0068] Preferably, an activated carbon adsorption layer is provided inside the exhaust pipe 311 to filter and adsorb the exhausted gas, and to adsorb the microplastics in the sample air and harmful gases that may be generated during the detection process.

[0069] Among them, the collection tube 33 is provided with a threaded connector, which can be assembled with pipes of different lengths, so as to facilitate the collection of gases in different environments for detection; the air inlet pipe 34 is preferably connected to the front side of the sampling box 31.

[0070] The cleaning box 5 is sealed by setting a sealing plate 313 in the sampling box 31, so that the gas to be detected in the sampling box 31 can be separated from the cleaning box 5. Since the cleaning box 5 is arranged at the bottom of the sampling box 31 and is provided with a cleaning device 7, it is not convenient to operate the vacuum pump 32 during detection to discharge the gas in the cleaning box 5 through the exhaust pipe 311. If the sealing plate 313 is not provided, the gas in the cleaning box 5 may interfere with the detection result.

[0071] See also Figure 1 and Figure 2 In this embodiment, the sealing plate 313 is slidably installed inside the sampling box 31, and the end of the sealing plate 313 away from the detection device body 1 passes through the sampling box 31 and extends to the outside of the sampling box 31.

[0072] When the detection end of the detection device body 1 needs to be cleaned, the sealing plate 313 is pulled out by pulling the end of the sealing plate 313 located outside the sampling box 31, so that the cleaning box 5 is connected with the sampling box 31, which is convenient for subsequent cleaning work;

[0073] A pull ring is provided at one end of the sealing plate 313 located outside the sampling box 31 to facilitate pulling the sealing plate 313;

[0074] An embedding groove is opened on the inner wall of the sampling box 31, and the side of the sealing plate 313 slides into the embedding groove to form a sliding fit. A sealing sleeve is sleeved on the side of the sealing plate 313 to ensure the sealing during sealing and increase the friction with the slide groove. The stability of the sealing plate 313 can be guaranteed during sealing and it will not slide at will.

[0075] In other embodiments, bolts may also be included, and assembly holes may be opened at the bottom of the sampling box 31 and at positions corresponding to the sealing plate 313, and nuts may be preset in the assembly holes at the bottom of the sampling box 31, the bolts and the nuts may be threadedly connected, and the ends may be inserted into the assembly holes of the sealing plate 313 to achieve stable positioning of the sealing plate 313.

[0076] See also Figure 2 and Figure 3 In this embodiment, the cleaning device 7 includes a mounting member 71 and a first cleaning sponge 72. The mounting member 71 is slidably installed inside the cleaning box 5. The first cleaning sponge 72 is installed on the mounting member 71 and faces the detection equipment body 1. The output end of the lifting device 4 passes through the cleaning box 5 and is connected to the mounting member 71.

[0077] When cleaning is required, the lifting device 4 pushes the mounting member 71 upward, and the mounting member 71 drives the first cleaning sponge 72 upward to interact with the detection head of the detection device body 1 to wipe and clean its surface, and the lifting device 4 can continue to reciprocate for multiple cleanings.

[0078] The length of the first cleaning sponge 72 is greater than the width of the detection head of the detection device body 1, thereby ensuring that the entire detection head can be cleaned.

[0079] The mounting member 71 is detachably connected to the output end of the lifting device 4, such as by using bolts to sequentially penetrate the mounting member 71 and the output end of the lifting device 4 and be threadedly connected to the mounting member 71 (not shown), or by using a clamping connection, etc. The front side or the rear side of the cleaning box 5 is detachable, so that the mounting member 71 can be removed after the side wall of the cleaning box 5 is removed to facilitate cleaning of the first cleaning sponge.

[0080] Slide grooves are correspondingly provided on both sides of the inner walls of the sampling box 31 and the cleaning box 5, and sliders are correspondingly provided on both sides of the mounting member 71, which slide into the slide grooves to form a sliding assembly, and the slide grooves on the sampling box 31 are connected with the above-mentioned embedded grooves, and the sealing plate 313 extends into the embedded grooves, so that the sealing plate 313 can block the slide grooves at the same time, and an opening is provided at the bottom end of the slide groove, and when the mounting member 71 is disassembled, the sliders on both sides of the mounting member 71 can be moved out through the openings.

[0081] In other embodiments, the cleaning device 7 includes a motor, a swing shaft and a first cleaning sponge 72. The motor is installed on the cleaning box 5. The output end of the motor passes through the cleaning box 5 and is connected to the swing shaft. The first cleaning sponge 72 is installed on the swing shaft and faces the detection end of the detection equipment body 1. The swing shaft is driven by the motor to swing, and the swing shaft drives the first cleaning sponge 72 to clean the detection head of the detection equipment body 1.

[0082] See also Figures 2 to 4 As a preferred embodiment of this embodiment, the cleaning device 7 also includes a sealing cylinder 75 and a rotating device 74, the mounting member 71 includes a mounting shaft 711 and a liquid storage cylinder 712, one end of the liquid storage cylinder 712 is mounted on the mounting shaft 711, the first cleaning sponge 72 is connected to the interior of the liquid storage cylinder 712, one end of the sealing cylinder 75 is arranged inside the liquid storage cylinder 712, the other end of the sealing cylinder 75 passes through the liquid storage cylinder 712 and extends to the outside of the liquid storage cylinder 712, the sealing cylinder 75 is used to separate the first cleaning sponge 72 and the cleaning liquid, a strip hole 751 is provided on the sealing cylinder 75, the rotating device 74 is used to drive the sealing cylinder 75 to rotate, and the mounting shaft 711 is mounted at the output end of the lifting device 4.

[0083] By setting a liquid storage cylinder 712 and setting a cleaning liquid inside the liquid storage cylinder 712, when cleaning the detection end of the detection device body 1, the rotating device 74 drives the blocking cylinder 75 to rotate so that the strip hole 751 on the blocking cylinder 75 is aligned with the first cleaning sponge 72, as shown in FIG. Figure 4 (a) to Figure 4(b), at this time, the cleaning liquid will penetrate into the first cleaning sponge 72. 1-3 seconds after the strip hole 751 is aligned with the first cleaning sponge 72, the rotating device 74 drives the sealing cylinder 75 to rotate again, so that the strip hole 751 and the first cleaning sponge 72 are staggered again to prevent the cleaning liquid from continuing to penetrate into the first cleaning sponge 72. Then the lifting device 4 drives the liquid storage cylinder 712 to move upward through the installation shaft 711, thereby driving the first cleaning sponge 72 to move upward, and the detection end mirror of the detection equipment body 1 is cleaned. By adding cleaning liquid to the first cleaning sponge 72, the cleaning effect is improved.

[0084] Among them, a liquid adding tube is arranged on the liquid storage cylinder 712, and a sealing cover 722 is arranged on the liquid adding tube. The cleaning device 7 can be disassembled and liquid can be replenished through the liquid adding tube, and the first cleaning sponge 72 can be cleaned. In this embodiment, the output end of the lifting device 4 is detachably connected to the installation shaft 711.

[0085] As an optional method of this embodiment, the rotating device 74 includes a motor, a main gear and a slave gear. The motor is installed on the liquid storage cylinder 712 through a bracket, and the main gear and the slave gear are respectively installed on the output shaft of the motor and the blocking cylinder 75. The motor drives the blocking cylinder 75 to rotate through the gear and the slave gear to achieve position adjustment of the strip hole 751.

[0086] Please refer to the figure Figure 3 and Figure 5 As another optional method of this embodiment, the rotating device 74 includes a connecting sleeve 741, a driving block 742 and a coil spring 743. The connecting sleeve 741 is installed at the other end of the liquid storage cylinder 712. The coil spring 743 is sleeved on the blocking cylinder 75. The coil spring 743 connects the connecting sleeve 741 and the blocking cylinder 75. The driving block 742 is installed on the blocking cylinder 75. A block 51 is installed on the inner wall of the cleaning box 5, and the block 51 is located below the driving block 742.

[0087] Please refer to Figure 6 (a) and Figure 7The locking cam 752 is in the process of being lifted up, and the locking cam 753 is in the process of being lifted up, so that the locking cam 752 is in the process of being lifted up, and the locking cam 753 is in the process of being lifted up, so that the locking cam 753 is in the process of being lifted up, and the locking cam 754 is in the process of being lifted up, and the locking cam 753 is in the process of being lifted up, and the locking cam 754 is in the process of being lifted up, and the locking cam 753 is in the process of being lifted up, and the locking cam 753 is in the process of being lifted up,

[0088] See also Figure 2 The cleaning device 7 also includes a second cleaning sponge 73 and a rotating device 76. The first cleaning sponge 72 and the second cleaning sponge 73 are respectively installed on both sides of the liquid storage cylinder 712. The liquid storage cylinder 712 is rotatably installed on the installation shaft 711. The rotating device 76 is used to drive the liquid storage cylinder 712 to rotate.

[0089] By setting up the rotating device 76, after the detection head of the detection equipment body 1 is cleaned by the first cleaning sponge 72, the liquid storage cylinder 712 can be rotated to make the first cleaning sponge 72 face the air inlet pipe 34, and the lifting device 4 can adjust the height of the first cleaning sponge 72 to align it with the air inlet pipe 34, and then the vacuum pump 32 works to blow the air flow from the collection tube 33 through the air inlet pipe 34 to the first cleaning sponge 72, so as to accelerate the drying speed of the first cleaning sponge 72.

[0090] When the first cleaning sponge 72 is adjusted toward the air inlet pipe 34, the second cleaning sponge 73 is directed toward the detection head of the detection device body 1, so that the detection head can be wiped by the second cleaning sponge 73 to wipe the water stains on the mirror surface, and of course, it can also cooperate with the airflow blown out of the air inlet pipe 34 to better ensure the cleanliness of the detection head;

[0091] After the cleaning is completed, the rotating device 76 rotates the liquid storage cylinder 712 so that the first cleaning sponge 72 faces the detection end of the detection device body 1 again.

[0092] The second cleaning sponge 73 is not connected to the liquid storage cylinder 712 and remains dry.

[0093] As an optional method of this embodiment, the rotating device 76 includes a motor, a main gear and a slave gear. The motor is installed on the mounting shaft 711 through a bracket. The main gear and the slave gear are respectively installed on the output shaft of the motor and the liquid storage cylinder 712. The motor drives the liquid storage cylinder 712 to rotate through the gear and the slave gear to achieve position adjustment of the first cleaning sponge 72 and the second cleaning sponge 73.

[0094] Please refer to the figure Figure 2 and Figure 3 The rotating device 76 includes a gear 761 and a one-way bearing 762, and the gear 761 is installed on the liquid storage cylinder 712 through the one-way bearing 762. The device for detecting microplastics in the atmosphere also includes a gear plate 8, which is installed on the top of the inner wall of the sampling box 31 and is located above the gear 761.

[0095] Please refer to Figure 6 (c) When it is necessary to adjust the positions of the first cleaning sponge 72 and the second cleaning sponge 73, the lifting device 4 can lift the cleaning device 7 so that the gear 761 and the tooth plate 8 act on each other. At this time, the first cleaning sponge 72 is separated from the detection head of the detection device body 1 and is located above the detection head. The lifting device 4 continues to lift the cleaning device 7, and the gear 761 and the tooth plate 8 continue to act on each other. The gear 761 drives the liquid storage cylinder 712 to flip through the one-way bearing 762, switching the positions of the first cleaning sponge 72 and the second cleaning sponge 73. When the lifting device 4 subsequently moves the cleaning device 7 downward, when the gear 761 and the tooth plate 8 act on each other again, the gear 761 will not drive the liquid storage cylinder 712 to rotate through the one-way bearing 762.

[0096] Thus, the lifting device 4 can be used to drive the cleaning device 7 to move to different positions. In conjunction with the stop block 51 and the tooth plate 8, the functions of adding cleaning liquid to the first cleaning sponge 72, driving the cleaning device 7 to clean the detection end of the detection equipment body 1, and switching the positions of the first cleaning sponge 72 and the second cleaning sponge 73 can be completed in sequence.

[0097] After the subsequent cleaning is completed, the lifting device 4 can lift the cleaning device 7 again, so that the gear 761 acts on the tooth plate 8 again, and the first cleaning sponge 72 is switched to the detection end facing the detection device body 1 again.

[0098] In this embodiment, the lifting device 4 may include an electric push cylinder and a U-shaped rod. The electric push cylinder can be installed on the side of the sampling box 31 or on the mounting plate 2 through a mounting frame and is located on one side of the sampling box 31. The U-shaped rod connects the output end of the electric push cylinder and the mounting shaft 711.

[0099] The working principle of the device for detecting microplastics in the atmosphere provided by the present invention is as follows:

[0100] When detecting the content of microplastics in the air of the environment to be tested, the staff can hold the microplastic detection device in the atmosphere and place it in the environment to be tested, and then start the vacuum pump 32 to draw the air in the environment to be tested into the sampling box 31. When pumping air, the first valve 35 and the second valve 312 can be opened so that the air to be tested can enter the sampling box 31 through the air inlet pipe 34 and then be discharged from the exhaust pipe 311. After a period of time, the second valve 312 and the first valve 35 are closed successively, so that the initial air in the sampling box 31 can be discharged, so that the air in the sampling box 31 belongs to the gas of the current test environment, and then the detection device body 1 is started, and the detection end of the detection device body 1 detects the air in the sampling box 31 to detect the content and type of microplastics in the air;

[0101] After the test is completed or before the test, the cleaning device 7 can be pushed by the lifting cylinder 41 to clean the detection end of the detection equipment body 1 to prevent impurities such as microplastics or dust in the air sample from adhering to the detection head of the detection equipment body 1, affecting the operation of the detection equipment, and possibly causing cross contamination to subsequent tests, resulting in errors in the test results.

[0102] When cleaning, the lifting device 4 first drives the cleaning device 7 downward for a distance. During this process, the driving block 742 is blocked by the stopper 51 and cannot move downward with it. To meet the downward movement distance of the cleaning device 7, the portion where the driving block 742 and the stopper 51 act gradually tilts upward, and the stopper 51 drives the blocking tube 75 to rotate counterclockwise so that the strip hole 751 is aligned with the first cleaning sponge 72. In this process, the blocking tube 75 drives the coil spring 743 to contract while rotating. When the lifting device 4 drives the cleaning device 7 to move upward to clean the detection end of the detection device body 1, the driving block 742 is separated from the stopper 51, and the coil spring 743 drives the blocking tube 75 to rotate back to the original position, so that the strip hole 751 is staggered with the first cleaning sponge 72 again, thereby realizing the function of quantitatively adding cleaning liquid to the first cleaning sponge 72;

[0103] Then, the lifting device 4 pushes the installation shaft 711 upward, and the installation shaft 711 drives the first cleaning sponge 72 upward through the liquid storage cylinder 712 to interact with the detection head of the detection device body 1 to wipe and clean its surface, and the lifting device 4 can continue to reciprocate for multiple cleanings;

[0104] After the detection head of the detection device body 1 is cleaned by the first cleaning sponge 72, the lifting device 4 can lift the cleaning device 7 to make the gear 761 and the tooth plate 8 work together. At this time, the first cleaning sponge 72 is separated from the detection head of the detection device body 1 and is located above the detection head. The lifting device 4 continues to lift the cleaning device 7, and the gear 761 and the tooth plate 8 continue to work together. The gear 761 drives the liquid storage cylinder 712 to flip through the one-way bearing 762, switching the positions of the first cleaning sponge 72 and the second cleaning sponge 73.

[0105] The first cleaning sponge 72 is aligned with the air inlet pipe 34, and the lifting device 4 can adjust the height of the first cleaning sponge 72 to align it with the air inlet pipe 34, and then the vacuum pump 32 works to blow the air flow from the collection pipe 33 through the air inlet pipe 34 to the first cleaning sponge 72, thereby accelerating the drying speed of the first cleaning sponge 72.

[0106] When adjusting the first cleaning sponge 72 toward the air inlet pipe 34, the second cleaning sponge 73 is directed toward the detection head of the detection device body 1, so that the detection head can be wiped by the second cleaning sponge 73 to wipe off water stains on the mirror surface. Of course, it can also cooperate with the airflow blown out by the air inlet pipe 34 to better ensure the cleanliness of the detection head.

[0107] Thus, the lifting device 4 can be used to drive the cleaning device 7 to move to different positions. In conjunction with the stop block 51 and the tooth plate 8, the functions of adding cleaning liquid to the first cleaning sponge 72, driving the cleaning device 7 to clean the detection end of the detection equipment body 1, and switching the positions of the first cleaning sponge 72 and the second cleaning sponge 73 can be completed in sequence.

[0108] Second embodiment

[0109] See also Figure 8 The difference between the device for detecting microplastics in the atmosphere in the second embodiment and the device for detecting microplastics in the first embodiment is that:

[0110] The sampling box 31 is rotatably mounted on the mounting plate 2. The device for detecting microplastics in the atmosphere also includes a positioning member 6, which includes a mounting block 61, a positioning pin 62 and a driving handle 63. The mounting block 61 is mounted on the bottom of the mounting plate 2, one end of the positioning pin 62 passes through the mounting block 61, and the other end of the positioning pin 62 passes through the cleaning box 5. The driving handle 63 is mounted on the positioning pin 62 and is located between the cleaning box 5 and the mounting block 61.

[0111] The sampling box 31 is rotatably mounted on the mounting plate 2. Since the sampling box 31 is sleeved on the detection end of the detection device, the volume of the sampling box 31 is set larger than the detection range of the detection end of the detection device body 1. During the detection process, the sampling box 31 can be reciprocated to make the internal gas flow, so that the microplastics in the gas inside the sampling box 31 can be better reacted with the laser energy emitted by the detection device body 1 for detection, thereby improving the accuracy of the detection;

[0112] The component where the sampling box 31 is rotatably connected to the mounting plate 2 is provided with a sealing ring and other components to ensure the sealing of the rotating connection.

[0113] By providing the positioning member 6, the sampling box 31 can be limited in the axial direction when the detection equipment is not used or during the sampling process, so that the sampling can be performed more stably during the sampling process, and the rotation of the sampling box 31 due to vibration when the vacuum pump 32 is working can be avoided. At the same time, it can also avoid excessive wear of the sealing ring caused by the rotation of the sampling box 31 when it is not necessary.

[0114] When the sampling box 31 needs to be swung, the positioning pin 62 is moved toward the cleaning box 5 by driving the handle 63 and separated from the mounting block 61 .

[0115] The mounting block 61 is provided with an assembly hole adapted to the positioning pin 62 , and the positioning pin 62 passes through the mounting block 61 through the assembly hole.

[0116] Among them, a sheath is arranged on the cleaning box 5 at a position corresponding to the position through which the positioning pin 62 passes, and is sleeved on the surface of the positioning pin 62. A rubber sheath is arranged inside the sheath, and a rubber sheath is arranged inside the assembly hole. By arranging the rubber sheath, the friction between the positioning pin 62 can be increased, so that the positioning pin 62 can be stably limited.

[0117] See also Figure 1 and Figure 8 In this embodiment, the lifting device 4 includes a lifting cylinder 41, a connecting rod 42, a connecting frame 43 and two driving blocks 44. The lifting cylinder 41 is installed on the mounting plate 2 through a bracket, one end of the connecting rod 42 eccentrically penetrates the bottom of the cleaning box 5 and is connected to the cleaning device 7, the connecting frame 43 is connected to the other end of the connecting rod 42, the output end of the lifting cylinder 41 penetrates the connecting frame 43, the two driving blocks 44 are installed at the output end of the lifting cylinder 41 and are located on both sides of the connecting frame 43, and the spacing value between the two driving blocks 44 is greater than the thickness value of the connecting frame 43, a socket 421 is opened on the connecting rod 42, and the socket 421 is aligned with the positioning pin 62. When the driving handle 63 is pushed to drive one end of the positioning pin 62 to separate from the mounting block 61, the other end of the positioning pin 62 is inserted into the socket 421.

[0118] In this embodiment, one end of the connecting rod 42 is connected to the mounting shaft 711 .

[0119] See also Fig. 9 When the sampling box 31 needs to be swung during the detection process, the positioning pin 62 is first driven by the driving handle 63 to move toward the sampling box 31, and the positioning pin 62 is separated from the mounting block 61, and the other end of the positioning pin 62 is inserted into the socket 421 of the connecting rod 42;

[0120] See also Fig.10(a) At this time, the lifting cylinder 41 is pushed down, and the driving block 44 located at the top pushes one end of the connecting frame 43 downward, and the connecting frame 43 drives the cleaning box 5 on the side of the connecting rod 42 to tilt downward through the connecting rod 42 and the positioning pin 62. In this process, the connecting rod 42 and the connecting frame 43 slide relative to each other; similarly, when the lifting cylinder 41 is lifted up, the driving block 44 located at the bottom drives the connecting frame 43 to move upward, and the connecting frame 43 drives the cleaning box 5 on the side of the connecting rod 42 to tilt upward through the connecting rod 42 and the positioning pin 62. Similarly, the connecting rod 42 and the connecting frame 43 slide relative to each other, thereby realizing the function of driving the sampling box 31 to swing, and there is no need to swing it manually;

[0121] That is, by unlocking the positioning member 6 , it is possible to switch the lifting device 4 from the state of driving the cleaning device 7 to the state of driving the sampling box 31 to swing.

[0122] When the positioning pin 62 is subsequently inserted into the mounting block 61 again to limit the position of the sampling box 31 , the positioning pin 62 is separated from the connecting rod 42 , and the lifting device 4 is in a state of driving the cleaning device 7 to work again.

[0123] The distance between the two driving blocks 44 is greater than the thickness of the connection frame 43 , so that when the connection frame 43 tilts, the connection frame 43 has a space for tilting between the two driving blocks 44 .

[0124] In the first embodiment, the lifting device 4 may also adopt the above structure.

[0125] See also Figure 2 A protrusion 314 is provided inside the sampling box 31 .

[0126] The lifting cylinder 41 is an electric push cylinder, a pneumatic cylinder, a hydraulic cylinder, or the like.

[0127] By providing the protruding piece 314 , when the sampling box 31 is reciprocated, the protruding piece 314 can better drive the air flow inside the sampling box 31 .

[0128] Among them, a switch can be set on the handle of the detection equipment body 1 for controlling the operation of the vacuum pump 32, the lifting cylinder 41 and the detection equipment body 1 respectively, and also includes a control module for controlling the working status of the vacuum pump 32, the lifting cylinder 41 and the detection equipment body 1, and the control selection can be performed through the control screen on the detection equipment body 1. For example, the lifting device 4 can be selected as a liquid adding mode, that is, a mode for adding cleaning liquid to the first cleaning sponge 72. At this time, when the corresponding switch is turned on, the lifting device 4 drives the cleaning device 7 to add liquid to the first cleaning sponge 72.

[0129] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A device for detecting microplastics in the atmosphere, characterized in that: include: Detection equipment body, mounting plate, collection assembly, cleaning box, cleaning device and lifting device; The mounting plate is sleeved and fixedly mounted on the detection device body; The collection assembly includes a sampling box, an air pump, a collection tube, an air inlet pipe and a first valve, the sampling box is mounted on the mounting plate, the detection end of the detection device body extends to the interior of the sampling box, the air pump is mounted on the sampling box, the collection tube is mounted on the input end of the air pump, the air inlet pipe connects the output end of the air pump and the sampling box, the first valve is mounted on the air inlet pipe, an exhaust pipe is mounted at the bottom of the sampling box, and a second valve is provided on the exhaust pipe; The cleaning box is connected and installed at the bottom of the sampling box, and a sealing plate is detachably provided on the sampling box, and the sealing plate is used to seal the cleaning box; The cleaning device is arranged inside the cleaning box, the lifting device is arranged adjacent to the sampling box, and the output end of the lifting device passes through the bottom of the cleaning box and is connected to the cleaning device; The air inlet pipe and the exhaust pipe are both provided with a gas flow sensor.

2. The device for detecting microplastics in the atmosphere according to claim 1, characterized in that: The sealing plate is slidably mounted inside the sampling box, and one end of the sealing plate away from the detection device body passes through the sampling box and extends to the outside of the sampling box.

3. The device for detecting microplastics in the atmosphere according to claim 1, characterized in that: The cleaning device includes a mounting member and a first cleaning sponge. The mounting member is slidably mounted inside the cleaning box. The first cleaning sponge is mounted on the mounting member and faces the detection equipment body. The output end of the lifting device passes through the cleaning box and is connected to the mounting member.

4. The device for detecting microplastics in the atmosphere according to claim 3, characterized in that: The cleaning device also includes a sealing cylinder and a rotating device, the mounting part includes a mounting shaft and a liquid storage cylinder, one end of the liquid storage cylinder is mounted on the mounting shaft, the first cleaning sponge is connected to the interior of the liquid storage cylinder, one end of the sealing cylinder is arranged inside the liquid storage cylinder, the other end of the sealing cylinder passes through the liquid storage cylinder and extends to the outside of the liquid storage cylinder, the sealing cylinder is used to separate the first cleaning sponge and the cleaning liquid, a strip hole is provided on the sealing cylinder, the rotating device is used to drive the sealing 5 to rotate, and the mounting shaft is mounted at the output end of the lifting device.

5. The device for detecting microplastics in the atmosphere according to claim 4, characterized in that: The rotating device includes a connecting sleeve, a driving block and a coil spring, the connecting sleeve is installed at the other end of the liquid storage cylinder, the coil spring is sleeved on the blocking cylinder, the coil spring connects the connecting sleeve and the blocking cylinder, the driving block is installed on the blocking cylinder, and a block is installed on the inner wall of the cleaning box, and the block is located below the driving block.

6. The device for detecting microplastics in the atmosphere according to claim 5, characterized in that: The cleaning device also includes a second cleaning sponge and a rotating device. The first cleaning sponge and the second cleaning sponge are respectively installed on both sides of the liquid storage cylinder. The liquid storage cylinder is rotatably installed on the installation shaft. The rotating device is used to drive the liquid storage cylinder to rotate.

7. The device for detecting microplastics in the atmosphere according to claim 6, characterized in that: The rotating device includes a gear and a one-way bearing, and the gear is installed on the liquid storage cylinder through the one-way bearing. The device for detecting microplastics in the atmosphere also includes a toothed plate, which is installed on the top of the inner wall of the sampling box and is located above the gear.

8. The device for detecting microplastics in the atmosphere according to claim 1, characterized in that: The sampling box is rotatably mounted on the mounting plate. The device for detecting microplastics in the atmosphere also includes a positioning member, which includes a mounting block, a positioning pin and a driving handle. The mounting block is mounted on the bottom of the mounting plate, one end of the positioning pin passes through the mounting block, and the other end of the positioning pin passes through the cleaning box. The driving handle is mounted on the positioning pin and is located between the cleaning box and the mounting block.

9. The device for detecting microplastics in the atmosphere according to claim 8, characterized in that: The lifting device includes a lifting cylinder, a connecting rod, a connecting frame and two driving blocks. The lifting cylinder is installed on the mounting plate through a bracket. One end of the connecting rod eccentrically penetrates the bottom of the cleaning box and is connected to the cleaning device. The connecting frame is connected to the other end of the connecting rod. The output end of the lifting cylinder penetrates the connecting frame. The two driving blocks are installed at the output end of the lifting cylinder and are located on both sides of the connecting frame. The spacing between the two driving blocks is greater than the thickness of the connecting frame. A socket is provided on the connecting rod, and the socket is aligned with the positioning pin. When the driving handle is pushed to drive one end of the positioning pin to separate from the mounting block, the other end of the positioning pin is inserted into the socket.

10. The device for detecting microplastics in the atmosphere according to claim 1, characterized in that: A convex piece is arranged inside the sampling box.

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