A single particulate matter sampling device and system

Abstract

A single-particle sampling device and system according to the present invention includes: a sampling head, a motor, an air pump and a control module; the sampling head includes an upper cover, a particle size cutting plate, a sample stage, a sampling head rotating shaft and a lower cover; the upper cover and the lower cover form a cavity; an air inlet communicating with the outside atmosphere is provided on the upper cover, and an air outlet connected to the air pump is provided on the lower cover; the particle size cutting plate is disposed in the cavity, forms an acceleration cavity with the upper cover and a collection cavity with the lower cover; one or more particle size cutting holes are provided on the particle size cutting plate, and a number of uniformly distributed sample positions are provided on the sample stage, and each sample position is provided with grooves having the same number as the particle size cutting holes for placing sample membranes; the sampling head rotating shaft is disposed below the sample stage, and the motor is respectively connected to the sampling head rotating shaft and the control module to drive the sample stage to rotate according to the instructions of the control module. The present invention can remotely and real-time control the on / off of the air pump and the switching of the sample positions, thereby realizing continuous and automatic sampling.

Description

Technical Field

[0001] The present invention relates to the technical field of aerosol measurement, and in particular to a single-particle sampling device and system. Background Art

[0002] Aerosol particles in indoor air or outdoor atmosphere not only affect air quality, but may also endanger the health of exposed populations. Collecting and obtaining the composition information of atmospheric particles is an important means to improve air quality, analyze the climate, environment and health effects of particles. Most of the existing particle samplers collect samples based on principles such as inertial collision, filtration interception and electrostatic attraction. These samplers are relatively large in both mass and volume, and are not convenient for movement and carrying. The existing commonly used single-particle atmospheric sampler can only collect one sample at a time and cannot perform continuous sampling. If multiple samples need to be collected, it is necessary to disassemble and replace the sample membrane multiple times, and the operation is cumbersome and time-consuming. Moreover, the existing single-particle sampler can only provide manual or semi-automatic continuous sampling. During the sampling process, the sample position is manually switched to achieve continuous collection of multiple samples; a single sampler can only collect one sample at the same sampling time, and if multiple samples need to be collected simultaneously, multiple samplers need to be used at the same time. The application scenarios of the existing samplers are limited to a certain extent and cannot be used for some mobile platforms, such as collecting samples with high spatial resolution on unmanned aerial vehicles and long-term continuous observation at fixed points. Summary of the Invention

[0003] The main object of the present invention is to overcome the above-mentioned defects in the prior art, and propose a single-particle sampling device and system, which can manually and / or automatically remotely control the on / off of the air pump and the switching of the sample position in real time, so as to realize continuous automatic sampling of single particles.

[0004] The present invention adopts the following technical solutions:

[0005] On the one hand, a single-particle sampling device includes: a sampling head, a motor, an air pump and a control module; the sampling head includes an upper cover, a particle size cutting plate, a sample stage, a sampling head rotating shaft and a lower cover; the upper cover and the lower cover form a cavity; an air inlet communicating with the outside atmosphere is provided on the upper cover, and an air outlet connected to the air pump is provided on the lower cover; the particle size cutting plate is arranged in the cavity, forms an acceleration cavity with the upper cover, and forms a collection cavity with the lower cover, and the sample stage is arranged in the collection cavity; one or more particle size cutting holes are provided on the particle size cutting plate, and a number of uniformly distributed sample positions are provided on the sample stage. Each sample position is provided with grooves having the same number as the particle size cutting holes for placing sampling membranes, and the center of each particle size cutting hole is aligned with the center of each groove of a sample position; the sampling head rotating shaft is arranged below the sample stage, and the motor is respectively connected to the sampling head rotating shaft and the control module to drive the sample stage to rotate according to the instructions of the control module.

[0006] Preferably, two alignment lines are respectively provided on the particle size cutting plate, the sample stage, and the lower cover; the alignment lines on the particle size cutting plate, the alignment lines on the sample stage, and the alignment lines on the lower cover are used for mutual alignment.

[0007] Preferably, a gap is provided between adjacent sample positions.

[0008] Preferably, the upper cover and the lower cover are cylindrical in shape; the particle size cutting plate and the sample stage are disc-shaped.

[0009] Preferably, the single-particle sampling device further includes: a first O-ring and a second O-ring; the upper cover and the lower cover are connected by the first O-ring; the particle size cutting plate and the lower cover are connected by the second O-ring.

[0010] Preferably, a rolling bearing and a third O-ring are provided between the sampling head rotating shaft and the lower cover.

[0011] Preferably, the single-particle sampling device further includes: a coupling; the motor rotating shaft of the motor is connected to the lower end of the sampling head rotating shaft through the coupling.

[0012] Preferably, the single-particle sampling device further includes: a motor fixing plate; the motor is fixed on the motor fixing plate; the motor fixing plate is connected to the lower cover through a plurality of copper columns.

[0013] Preferably, the single-particle sampling device further includes: a DC power supply; the DC power supply is connected to the control module for power supply.

[0014] On the other hand, a single-particle sampling system includes: a sampling box body; and further includes the single-particle sampling device described above; the single-particle sampling device is arranged in the sampling box body.

[0015] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The present invention combines the use of a particle size cutting plate, a sample stage, a sampling head rotating shaft, a motor, an air pump, a control module, etc., and can remotely manually and / or automatically remotely and real-time control the on / off of the air pump and the switching of sample positions, so as to realize continuous automatic collection of multiple samples without disassembling and replacing the sample film in the middle;

[0017] (2) The present invention only needs to replace the particle size cutting plate with different numbers and apertures of cutting holes and adjust the sampling flow rate to realize the collection of particulate matter in different particle size ranges;

[0018] (3) The present invention can achieve continuous sampling of different numbers of samples by simply replacing the sample stages with different numbers of sample positions (such as sample stages with 5, 13, or 20 sample positions).

[0019] (4) The present invention uses particle size cutting plates with different numbers of cutting holes and sample stages with corresponding numbers of grooves, which can hold different sample membranes (such as electron microscopy copper grids and silicon wafers), and can simultaneously sample multiple samples (such as 2 or more samples).

[0020] (5) By setting the first O-ring, the second O-ring, and the third O-ring, the present invention ensures good airtightness of the entire sampling head.

[0021] (6) The present invention is light in weight and small in size. The sampling box body is easy to carry, disassemble, and assemble, and is suitable for different sampling environments. It can be used for fixed or mobile observation platforms, such as being mounted on an unmanned aerial vehicle to collect samples with high spatial and temporal resolutions through remote real-time control.

[0022] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present invention more obvious and understandable, the following specific embodiments of the present invention are listed.

[0023] Those skilled in the art will understand the above and other purposes, advantages, and features of the present invention more clearly according to the following detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view of the single-particle sampling device of the present invention;

[0025] Figure 2 is a structural diagram of the single-particle sampling device of the present invention;

[0026] Figure 3 is a schematic diagram of the particle size cutting plate of the present invention;

[0027] Figure 4 is a schematic diagram of the sample stage of the present invention;

[0028] Figure 5 is a perspective view of the single-particle sampling system of the present invention;

[0029] Among them, 1. Single-particle sampling device; 10. Sampling head; 101. Upper cover; 1011. Air inlet; 102. Lower cover; 1021. Air outlet; 103. Particle size cutting plate; 1031. Particle size cutting hole; 1032. Alignment line of the particle size cutting plate; 104. Sample stage; 1041. Sample position; 1042. Groove; 1043. Gap; 1044. Alignment line of the sample stage; 105. Acceleration chamber; 106. Collection chamber; 107. Sampling head rotating shaft; 108. First O-ring; 109. Second O-ring; 110. Rolling bearing; 111. Third O-ring; 112. Screw; 113. Coupling; 114. Motor rotating shaft; 115. Motor fixing plate; 116. Copper column; 11. Motor; 12. Air pump; 13. Control module; 2. Sampling box; 20. Air inlet hole; 21. Handle. Detailed implementation manners

[0030] The present invention will be further described below through specific implementation manners.

[0031] See Figure 1 and Figure 2 As shown in

[0032] The present invention uses components such as the particle size cutting plate 103, the sample stage 104, the sampling head rotating shaft 107, the motor 11, the air pump 12, and the control module 13 in combination, and can remotely and manually control and / or automatically control the switching on and off of the air pump 12 and the switching of the sample position 1041, so as to achieve continuous collection of multiple samples without the need to disassemble and replace the sample film in the middle.

[0033] Further, preferably, the single particle sampling device 1 further includes: a first O-ring 108 and a second O-ring 109; the upper cover 101 and the lower cover 102 are connected through the first O-ring 108; the particle size cutting plate 103 and the lower cover 102 are connected through the second O-ring 109, which can ensure good tightness between the upper cover 101 and the lower cover 102.

[0034] Further, a rolling bearing 110 and a third O-ring 111 are provided between the sampling head rotating shaft 107 and the lower cover 102. Combining with the first O-ring 108 and the second O-ring 109, it can ensure good tightness of the entire sampling head 10.

[0035] Specifically, the sample stage 104 and the sampling head rotating shaft 107 are fixed by screws 112.

[0036] In this embodiment, the single particle sampling device 1 further includes: a coupling 113; the motor rotating shaft 114 of the motor 11 is connected to the lower end of the sampling head rotating shaft 107 through the coupling 113.

[0037] Further, the single particle sampling device 1 further includes: a motor fixing plate 115; the motor 11 is fixed on the motor fixing plate 115; the motor fixing plate 115 is connected to the lower cover 102 through a plurality of copper columns 116.

[0038] Further, the single particle sampling device 1 further includes: a DC power supply 14; the DC power supply 14 is connected to the control module 13 for power supply.

[0039] In this embodiment, the particle size cutting plate 103 and the sample stage 104 are in the shape of a disc. Correspondingly, as Figure 1 and 2 shown, the upper cover 101 and the lower cover 102 are in the shape of a cylinder. Of course, in other embodiments, they can also be other shapes, and the present invention does not make specific limitations.

[0040] See Figure 3 shown, the particle size cutting plate 103 includes 3 particle size cutting holes 1031 and 2 alignment lines. In this embodiment, the aperture of the particle size cutting hole 1031 is 0.65 mm, and the theoretical cutting particle size is 0.5 μm. SeeFigure 4 As shown, the sample stage 104 includes 13 sample positions 1041 and two alignment lines (such as the alignment line 1044 of the sample stage in Figure 4 ). Correspondingly, two alignment lines are also provided on the lower cover 102. In this embodiment, the included angle between the center lines of adjacent sample positions 1041 is 28°, and gaps 1043 are arranged between adjacent sample positions 1041, which can reduce the influence of air flow on sampling; each sample position 1041 includes three grooves 1042 for placing sample membranes; among them, there are two circular grooves 1042 with a diameter of 3 mm for placing copper grids for electron microscopy for particulate matter analysis; one square groove 1042 with a side length of 4 mm for placing silicon wafers. The connecting lines between the centers of the three particle size cutting holes 1031 in the particle size cutting plate 103 and the centers of the corresponding grooves 1042 in the sample stage 104 are perpendicular to the plane where the particle size cutting plate 103 and the sample stage 104 are located; by aligning the two alignment lines of the sample stage 104, the two alignment lines of the lower cover 102 of the sampling head 10, and the two alignment lines of the particle size cutting plate 103 (such as the alignment line 1032 of the particle size cutting plate in Figure 3 ) and the two alignment lines of the lower cover 102 of the sampling head 10, the alignment of the centers of the three particle size cutting holes 1031 and the centers of the three grooves 1042 is achieved.

[0041] Since the particle size cutting plate 103 of the present invention includes three particle size cutting holes 1031, and each sample position 1041 includes three grooves 1042, by placing sample membranes (different sample membranes can be placed, such as copper grids for electron microscopy and silicon wafers) in each groove, multiple samples can be collected simultaneously.

[0042] It should be noted that the present invention can replace the particle size cutting plate 103 with different numbers and apertures of cutting holes, and by replacing different particle size cutting plates 103 and adjusting the sampling flow rate, the collection of particulate matter in different particle size ranges can be achieved.

[0043] Furthermore, the present invention can replace the sample stage 104 with different numbers of sample positions 1041 (such as the sample stage 104 with 5, 13, or 20 sample positions 1041), and by replacing the sample stage 104 with different numbers of sample positions 1041, continuous collection of different numbers of samples can be achieved.

[0044] Furthermore, when replacing the sample stage 104, the present invention can not change the number of sample positions 1041 included, but only change the number of grooves 1042 included in a single sample position 1041; of course, when replacing the sample stage 104, the number of sample positions 1041 included can also be changed, and the number of grooves 1042 included in a single sample position 1041 can be changed. Specifically, it can be adjusted according to actual needs. By changing the number of grooves 1042, multiple samples can be collected simultaneously.

[0045] In this embodiment, the stepping motor 11 is fixed on the motor fixing plate 115. The motor fixing plate 115 is connected to the lower cover 102 through four copper columns 116. The motor rotating shaft 114 is connected to the lower end of the sampling head rotating shaft 107 through a coupling 113. The control module 13 is powered by a DC power supply. The control module 13 includes an STM32 series single-chip microcomputer and can be programmed for control. Two sampling modes, manual control and automatic control, can be realized through program compilation. The motor 11, the air pump 12 are connected to the control module 13. By controlling the rotation time and rotation angle of the motor 11 through the control module 13, the rotation of the sampling head rotating shaft 107 is controlled to switch the sample position 1041. In the manual control mode, the switching of the sample position 1041 and the on / off of the pump can be controlled in real time and remotely, and continuous sampling can be realized. In the case of no obstacles, the remote transmission distance of the signal is about 3 km. In the automatic mode, the automatic switching of the sample position 1041 and the automatic on / off of the pump can be realized according to the set time, so as to realize continuous automatic sampling.

[0046] The sampling process of the present invention is as follows:

[0047] Before sampling, first assemble the sampling device to ensure that the particle size cutting hole 1031 is aligned with one of the sample positions 1041 on the sample stage 104. Connect a flow meter to the air inlet 1011 of the sampling head 10, turn on the air pump 12, and adjust the rotation speed to a preset value such as 4.2 L / min. In the manual control mode, send a command through the computer to turn on the air pump 12. The sampled gas enters the acceleration chamber 105 from the air inlet 1011. After the single particles are accelerated through the three particle size cutting holes 1031, they are enriched on the sample film. After the collection of one sample position is completed, send a command to turn off the air pump 12, and then send a command to rotate the motor 11 to switch to the next sample position 1041. In the automatic control mode, set the sampling start time, the collection time for each sample position, and the sampling time interval in advance. The sampling device will automatically turn on the air pump 12, turn off the air pump 12, and switch the sample position 1041 according to the set parameters to complete the entire sampling process.

[0048] See Figure 5 As shown in the figure, a single particle sampling system of the present invention includes: a sampling box 2; and further includes the single particle sampling device 1; the single particle sampling device 1 is arranged in the sampling box 2.

[0049] Specifically, the single particle sampling device 1 is fixed above the bottom of the sampling box 2 through several columns 3. An air inlet hole 20 is provided at the top of the sampling box 2 to facilitate the introduction of external gas. In addition, a handle 21 is provided at the top of the sampling box 2, which is convenient for carrying. When in use, just open the top or side of the sampling box 2, and place the assembled sampling device in the sampling box 2 for fixation.

[0050] The above are only specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantive modification of the present invention using this concept shall fall within the scope of infringement of the protection scope of the present invention.

Claims

1. A single particulate sampling device, characterized in that, Comprising: A sampling head, a motor, an air pump, and a control module; the sampling head includes an upper cover, a particle size cutting plate, a sample stage, a sampling head rotating shaft, and a lower cover; the upper cover and the lower cover form a cavity; an air inlet communicating with the outside atmosphere is provided on the upper cover, and an air outlet connected to the air pump is provided on the lower cover; the particle size cutting plate is arranged in the cavity, forms an acceleration cavity with the upper cover, and forms a collection cavity with the lower cover, and the sample stage is arranged in the collection cavity; one or more particle size cutting holes are provided on the particle size cutting plate, and a number of uniformly distributed sample positions are provided on the sample stage, and a groove with the same number of particle size cutting holes as the number of particle size cutting holes is provided on each sample position for placing a sample film, and the center of each particle size cutting hole is aligned with the center of each groove of a sample position; the sampling head rotating shaft is arranged below the sample stage, and the motor is respectively connected to the sampling head rotating shaft and the control module to drive the sample stage to rotate according to the instruction of the control module; a gap is provided between adjacent sample positions; two alignment lines are respectively provided on the particle size cutting plate, the sample stage, and the lower cover; the alignment lines on the particle size cutting plate, the alignment lines on the sample stage, and the alignment lines on the lower cover are used for mutual alignment.

2. The single-particle sampling device according to claim 1, wherein The upper cover and the lower cover are cylindrical in shape; the particle size cutting plate and the sample stage are disc-shaped.

3. The single-particle sampling device according to claim 2, wherein Further comprising: A first O-ring and a second O-ring; the upper cover and the lower cover are connected by the first O-ring; the particle size cutting plate and the lower cover are connected by the second O-ring.

4. The single particle sampling device according to claim 1, characterized in that A rolling bearing and a third O-ring are provided between the sampling head rotating shaft and the lower cover.

5. The single-particle sampling device according to claim 1, characterized in that, Further comprising: A coupling; the motor rotating shaft of the motor is connected to the lower end of the sampling head rotating shaft through the coupling.

6. The single particulate matter sampling device according to claim 1, wherein Further comprising: A motor fixing plate; the motor is fixed on the motor fixing plate; The motor fixing plate is connected to the lower cover through a number of copper columns.

7. The single particulate matter sampling device according to claim 1, wherein, Further comprising: A DC power supply; the DC power supply is connected to the control module for power supply.

8. A single particulate sampling system, characterized in that, Comprising: A sampling box; further comprising the single-particle sampling device according to any one of claims 1 to 7; The single-particle sampling device is arranged in the sampling box.

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