A particulate matter sampler

Abstract

The utility model discloses a kind of particulate matter sampling instruments, including instrument cabinet and sampling head, sampling head is rotated lifting type communication with instrument cabinet top by lifting rotary pipeline, lifting rotary pipeline includes gas transmission fixed cannula and the gas transmission bottom pipe slidingly inserted in its bottom, gas transmission bottom pipe is connected with rotating assembly, gas transmission fixed cannula is driven lifting by lifting assembly, rotating assembly includes driving gear and driven gear ring, drive sampling head horizontal rotation, lifting assembly controls sampling head height adjustment by lead screw, lead screw nut and L type connecting rod, positioning key and positioning slide rail cooperate to prevent circumferential deviation, sealing ring ensures gas seal. The present application solves the problem that the height and angle adjustment of the existing sampling instrument is limited, and realizes multi-dimensional flexible sampling.

Description

Technical Field

[0001] This utility model relates to the field of sampling instrument technology, specifically a particulate matter sampler. Background Technology

[0002] A particulate matter sampler is a specialized environmental monitoring device used to collect airborne particulate matter (PM). Its core purpose is to capture airborne particulate matter onto a specific filter membrane for subsequent concentration calculation and chemical composition analysis.

[0003] The working principle of the particulate matter sampler is based on isokinetic sampling and filter membrane weighing; a certain volume of air is drawn at a constant flow rate by a pump; then the sampling head (cutter) separates particles of different sizes using the principle of inertial impact. The TSP sampling head is divided into: TSP sampling head: collects total suspended particulate matter, which usually refers to particulate matter with an aerodynamic equivalent diameter ≤100μm; PM10 sampling head: Collects inhalable particulate matter, which refers to particulate matter with an aerodynamic equivalent diameter ≤10μm; PM2.5 sampling head: Collects fine particulate matter, referring to particulate matter with an aerodynamic equivalent diameter ≤ 2.5μm; PM1 sampling head: Collects ultrafine particulate matter, which refers to particles with an aerodynamic equivalent diameter ≤1μm. Then, it is filtered through a filter membrane located after the sampling head. At the same time, a flow control system is used to ensure that the flow rate remains constant throughout the sampling process.

[0004] Before and after sampling, the filter membrane was precisely weighed under constant temperature and humidity conditions. The difference between the two weights is the mass of the collected particulate matter, which is then divided by the sampling volume (flow rate × time) to calculate the mass concentration of the particulate matter.

[0005] In the process of particulate matter sampling, the existing samplers are not flexible enough, as they are mostly fixed on the top of the machine and lack effective height adjustment and rotation capabilities, making it inconvenient to collect particulate gas. In response, this technical solution designs a new particulate matter sampler based on existing samplers. Utility Model Content

[0006] The purpose of this invention is to provide a particulate matter sampler to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a particulate matter sampler, including an instrument housing and a sampling head; the sampling head is rotatably and vertically connected to the top of the instrument housing via a lifting and rotating pipe; The lifting and rotating pipeline includes a gas transmission fixed sleeve and a gas transmission bottom pipe that is slidably inserted into its bottom; The gas transmission bottom pipe is connected to the rotating assembly, and the gas transmission fixed sleeve is connected to the lifting assembly. The rotating component is used to drive the sampling head to rotate horizontally, and the lifting component is used to adjust the height of the sampling head.

[0008] Preferably, the outer circumferential wall of the gas transmission bottom pipe is provided with a positioning key, and the inner wall of the gas transmission fixed sleeve is provided with a positioning slide rail that slides in cooperation with the positioning key to restrict the circumferential rotation of the gas transmission fixed sleeve.

[0009] Preferably, the rotating assembly includes a driven gear ring fixed to the outer wall of the gas transmission bottom pipe, a driving gear meshing with the driven gear ring, and a servo motor driving the driving gear. The bottom of the gas transmission tube is provided with a limiting rotating ring, and the inner wall of the instrument box is provided with an annular groove that rotates in conjunction with the limiting rotating ring.

[0010] Preferably, the lifting assembly includes a lead screw, a lead screw nut, an L-shaped connecting rod, and a rotating lifting slider; The lead screw is driven by a servo motor, and the lead screw nut is restricted to moving only along the lead screw axis by a guide key. The rotary lifting slider is installed at the end of the L-shaped connecting rod and is slidably connected to the rotary lifting ring rail on the outer wall of the gas transmission fixed sleeve.

[0011] Preferably, the rotating lifting slider has an arc-shaped structure and makes arc-shaped sliding contact with the inner wall of the rotating lifting ring rail.

[0012] Preferably, a sealing ring is provided at the connection between the gas transmission fixed sleeve and the gas transmission bottom tube, and a sealing ring is provided at the connection between the gas transmission bottom tube and the instrument chassis.

[0013] Preferably, the outer side of the lifting assembly is provided with a rotating lifting assembly housing, and its side wall is provided with a lifting slide for the L-shaped connecting rod to slide.

[0014] Compared with the prior art, the beneficial effects of this utility model are: through the synergistic effect of the rotating component and the lifting component, it supports the height lifting and horizontal rotation of the sampling head, adapting to the needs of particle collection at different heights and directions; Easy to operate: Servo motors one and two control rotation and lifting respectively, automatically adjusting the sampling position and reducing manual intervention. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a particulate matter sampler.

[0016] Figure 2 This is a partial structural diagram of a particulate matter sampler from a second perspective.

[0017] Figure 3 This is a schematic diagram of a partial structure of a particulate matter sampler.

[0018] Figure 4 for Figure 3 A magnified structural diagram of A in the diagram.

[0019] Figure 5 for Figure 2 An enlarged structural diagram of B in the diagram.

[0020] The components include: instrument housing 10, sampling head 11, gas transmission base tube 12, gas transmission fixed sleeve 13, positioning key 14, L-shaped connecting rod 15, rotary lifting ring rail 16, rotary lifting slider 17, mounting rod 18, lead screw 19, lead screw nut 20, driving gear 21, limiting rotary ring 22, ring groove 23, rotary lifting assembly housing 24, lifting slide 25, sealing ring 26, and driven gear ring 27. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] Please see Figures 1-3 A particulate matter sampler includes an instrument housing 10 and a sampling head 11. The sampling head 11 is rotatably and liftingly connected to the top of the instrument housing 10. A lifting and rotating pipe connects the bottom of the sampling head 11 and the top of the instrument housing 10. A lifting component is provided on one side of the top of the instrument housing 10 corresponding to the lifting and rotating pipe. The lifting component is slidably connected to the lifting and rotating pipe and is used to drive and adjust the operating height of the lifting and rotating pipe and the sampling head 11, so as to facilitate accurate and rapid sampling based on the height of the particulate gas distribution. Meanwhile, a rotating component is installed inside the instrument housing 10 at the bottom of the lifting and rotating pipe. The rotating component is used to drive the lifting and rotating pipe to rotate, that is, to control the sampling head 11 to rotate for gas particle collection. The sampling head 11 is equipped with TSP sampling heads, PM10 sampling heads, PM2.5 sampling heads and PM1 sampling heads arranged longitudinally at intervals inside, and each sampling head is equipped with a filter membrane at the bottom, which can sieve and filter the gas particles of the corresponding size. Meanwhile, an air pump and a flow control system are installed inside the instrument housing 10 at the bottom of the lifting and rotating pipe to control the utilization speed of the collected gas inside the sampling head 11 and the lifting and rotating pipe, ensuring the accuracy of sampling. Then, by weighing the particles remaining on the filter membrane, the results are compared before and after sampling to calculate the concentration of particulate matter.

[0026] In this embodiment of the invention, the lifting and rotating pipe includes a gas transmission fixed sleeve 13 connected to the bottom middle of the sampling head 11. A gas transmission bottom pipe 12 is slidably inserted into the lower side of the bottom of the gas transmission fixed sleeve 13. The bottom of the gas transmission bottom pipe 12 extends into the instrument housing 10 and connects to the rotating component. That is, the gas transmission fixed sleeve 13 is slidably fitted on the outside of the gas transmission bottom pipe 12, so that the normal transmission of gas is not affected when the height of the sampling head 11 is adjusted. See Figure 4A limiting rotating ring 22 is installed on the outer side of the bottom of the gas transmission tube 12. A ring groove 23 is opened in the inner wall of the instrument housing 10 corresponding to the limiting rotating ring 22. The limiting rotating ring 22 rotates along the inside of the ring groove 23, thereby limiting the gas transmission tube 12 in the vertical direction. At the same time, the rotating assembly includes a driven gear ring 27 fixedly installed on the outer wall of the gas transmission tube 12 above the limiting rotating ring 22. A set of driving gears 21 is meshed on one side of the driven gear ring 27. The bottom center of the driving gear 21 is connected to a servo motor fixed inside the instrument housing 10 through a coupling. That is, by starting the servo motor, the driving gear 21 is driven to rotate. The meshing between the driving gear 21 and the driven gear ring 27 is used to control the rotation of the gas transmission tube 12. Specifically, positioning keys 14 are installed on the outer circumferential wall of the gas transmission bottom tube 12, which are distributed parallel to the axis. Positioning slide rails are provided on the inner wall of the gas transmission fixed sleeve 13 corresponding to the positioning key 14. The positioning slide rails slide along the inner axis of the positioning key 14, thereby keeping the gas transmission fixed sleeve 13 slidingly fitted along the gas transmission bottom tube 12 and circumferentially rotating and limited. That is, when the gas transmission bottom tube 12 rotates, it simultaneously drives the gas transmission fixed sleeve 13 and the sampling head 11 at the top of the gas transmission fixed sleeve 13 to rotate, thereby realizing rotational sampling. See Figures 1-3 , Figure 5 The lifting assembly includes a servo motor 2 fixedly mounted on the top exterior of the instrument housing 10. The top output end of the servo motor 2 is connected to a lead screw 19 via a coupling. A lead screw nut 20 is threaded onto the lead screw 19. The servo motor 2 controls the rotation of the lead screw 19, thereby driving the lead screw nut 20 to move up and down along the lead screw 19. An L-shaped connecting rod 15 is connected to the side of the lead screw nut 20 facing the gas transmission fixed sleeve 13. An installation rod 18 is installed on the side wall of the end of the L-shaped connecting rod 15. A rotary lifting slider 17 is connected to the output end of the installation rod 18. A rotary lifting ring rail 16 is installed on the bottom outer wall of the gas transmission fixed sleeve 13 corresponding to the end of the rotary lifting slider 17. The rotary lifting slider 17 is placed inside the rotary lifting ring rail 16 and slides in contact with it. It is then limited in the vertical direction. When the lead screw nut 20 moves up and down, the gas transmission fixed sleeve 13 is synchronously controlled to move up and down along the gas transmission bottom pipe 12, thereby realizing the height adjustment of the sampling head 11. The rotary lifting slider 17 is configured with an arc-shaped structure, which makes arc-shaped sliding contact with the inner wall of the rotary lifting ring rail 16, thus maintaining sufficient contact between the two. Among them, for the instrument housing 10, the lead screw nut 20 and the servo motor 2, the lead screw nut 20 is equipped with a guide key (not shown in the figure), and when the lead screw 19 rotates, the lead screw nut 20 can only move up and down along the lead screw 19. The guide key includes: a key, a rectangular metal strip, which has high hardness and strength; Keyway: A straight groove on the outer cylindrical surface of the lead screw nut 20.

[0027] Another slot is located on a fixed component, typically a support or mounting plate, and is a corresponding straight groove.

[0028] Working principle: Part of the guide key is embedded in the keyway of the lead screw nut 20, and the other part is embedded in the keyway of the fixed component. The lead screw nut 20 and the fixed component are connected by this key. When the lead screw 19 rotates, the lead screw nut 20 cannot rotate with the lead screw 19 because it is constrained by the key. After the degree of freedom of rotation is restricted by the key, the only way for the lead screw nut 20 to move is along the direction of the key, that is, along the axial direction (up and down) of the lead screw 19.

[0029] In one embodiment of the present invention, a sealing ring is provided at the fitting point between the bottom end of the gas transmission fixed sleeve 13 and the gas transmission bottom tube 12 to prevent leakage of the gas transmitted inside the gas transmission bottom tube 12 and the gas transmission fixed sleeve 13. At the same time, a sealing ring 26 is fitted at the connection between the gas transmission bottom tube 12 and the inside of the instrument housing 10. The bottom of the sealing ring 26 is fixed to the upper surface of the instrument housing 10 and does not rotate with the gas transmission bottom tube 12, which is used to maintain the seal between the gas transmission bottom tube 12 and the inside and outside of the instrument housing 10. A set of rotating lifting component housing 24 is provided on the outside of the lifting component. A lifting slide 25 is provided on one side of the rotating lifting component housing 24 corresponding to the position of the L-shaped connecting rod 15. The lifting slide 25 is used for the L-shaped connecting rod 15 to slide up and down.

[0030] It should be noted that since this technical solution is an optimization based on the existing particulate matter sampler, it only optimizes the structure of the gas transmission channel between the sampling head 11 and the instrument housing 10. There are no substantial changes to the internal structure of the sampling head 11, the instrument housing 10, etc. Therefore, the internal structure distribution and operating principle of the instrument housing 10 and the sampling head 11 will not be described here, and they can all be implemented with reference to the existing technology.

[0031] The working principle of this utility model is as follows: In the idle position of this device, all the aforementioned driving components (representing power elements, electrical devices, and compatible power supplies) are connected via wires. The electrical connections are completed in sequence between the working components. The detailed connection methods are well-known in the field. The following mainly describes the working principle and process, without further explanation of the electrical control. The servo motor 2 of the starting lifting component drives the lead screw 19 to rotate. The lead screw nut 20 moves up and down along the guide key restriction direction. Through the L-shaped connecting rod 15, it pushes the rotating lifting slider 17 to slide along the rotating lifting ring rail 16, which drives the gas transmission fixed sleeve 13 to rise and fall axially along the gas transmission bottom pipe 12, thereby realizing the height adjustment of the sampling head 11. The servo motor of the rotating component is started, which drives the active gear 21 to rotate. The driven gear ring 27 meshes with the driven gear ring 27 to drive the gas transmission bottom tube 12 to rotate. Through the cooperation of the positioning key 14 and the positioning slide rail, the gas transmission fixed sleeve 13 and the sampling head 11 are driven to rotate horizontally to complete multi-angle sampling. After being screened by the filter membrane of the sampling head 11, the sampled gas passes through the gas transmission fixed sleeve 13 and the gas transmission bottom pipe 12 in sequence. Under the protection of the sealing ring and sealing ring 26, it is transmitted to the instrument housing 10 without leakage, and the constant flow rate is maintained by the air pump and the flow control system.

[0032] It should be understood that in this application, all rotating, sliding, meshing, belt-driven and other moving parts are well lubricated and not prone to slippage or wear, and each part is provided with a corresponding protective shell. However, in the accompanying drawings of this application, the connection state of each moving part is not shown. It should also be understood that all parts in this application are made of metal or plastic materials with suitable strength in the relevant field to ensure that their structural rigidity meets the actual requirements.

[0033] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A particulate matter sampler, comprising an instrument housing (10) and a sampling head (11), characterized in that: The sampling head (11) is connected to the top of the instrument housing (10) via a rotating lifting pipe; The lifting and rotating pipe includes a gas transmission fixed sleeve (13) and a gas transmission bottom pipe (12) that is slidably inserted into its bottom. The gas transmission bottom pipe (12) is connected to the rotating assembly, and the gas transmission fixed sleeve (13) is connected to the lifting assembly; The rotating component is used to drive the sampling head (11) to rotate horizontally, and the lifting component is used to adjust the height of the sampling head (11).

2. A particulate matter sampling instrument according to claim 1, wherein, The gas transmission bottom pipe (12) is provided with a positioning key (14) on its outer circumferential wall, and the gas transmission fixed sleeve (13) is provided with a positioning slide rail that slides in cooperation with the positioning key (14) on its inner wall, thereby restricting the circumferential rotation of the gas transmission fixed sleeve (13).

3. A particulate matter sampling instrument according to claim 1 or 2, wherein, The rotating assembly includes a driven gear ring (27) fixed to the outer wall of the gas transmission bottom pipe (12), a driving gear (21) meshing with the driven gear ring (27), and a servo motor driving the driving gear (21); The bottom of the gas transmission tube (12) is provided with a limiting rotating ring (22), and the inner wall of the instrument box (10) is provided with an annular groove (23) that rotates with the limiting rotating ring (22).

4. The particulate matter sampling instrument of claim 1, wherein, The lifting assembly includes a lead screw (19), a lead screw nut (20), an L-shaped connecting rod (15), and a rotating lifting slider (17). The lead screw (19) is driven by a servo motor, and the lead screw nut (20) is restricted to moving only along the axial direction of the lead screw (19) by a guide key; The rotary lifting slider (17) is installed at the end of the L-shaped connecting rod (15) and is slidably connected to the rotary lifting ring rail (16) on the outer wall of the gas transmission fixed sleeve (13).

5. A particulate matter sampling instrument according to claim 4, wherein, The rotating lifting slider (17) has an arc-shaped structure and makes arc-shaped sliding contact with the inner wall of the rotating lifting ring rail (16).

6. The particulate matter sampling instrument of claim 1, wherein, A sealing ring is provided at the connection between the gas transmission fixed sleeve (13) and the gas transmission bottom tube (12), and a sealing ring (26) is provided at the connection between the gas transmission bottom tube (12) and the instrument box (10).

7. The particulate matter sampling instrument of claim 1, wherein, The lifting assembly has a rotating lifting assembly housing (24) on its outer side, and a lifting slide (25) is provided on its side wall for the L-shaped connecting rod (15) to slide.

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