Non-tail gas particulate matter sampling device

Abstract

The present application relates to particulate matter test sampling device technical field, specifically to a kind of non-tail gas particulate matter sampling device, non-tail gas particulate matter sampling device includes the collection unit for being arranged in the tire periphery of measured vehicle and is connected with the collection unit by conveying pipeline sampling unit, collection unit includes the collection port for collecting non-tail gas particle generated in the tire driving process, further include collection port adjusting unit, collection port adjusting unit is connected with collection unit, collection port adjusting unit is used to adjust the position of collection port relative to the tire of measured vehicle;Collection port itself position can be adjusted according to vehicle speed, make collection port and the flight trajectory of non-tail gas particulate matter match, to achieve the effect of effectively collecting non-tail gas particulate matter, beneficial to guarantee the reliability of sampling result.

Description

Technical Field

[0001] This invention relates to the field of particulate matter testing and sampling devices, specifically to a non-exhaust gas particulate matter sampling device. Background Technology

[0002] With the booming development of new energy vehicles and their continuous growth in ownership, the characteristics of motor vehicle pollutant emissions have become more complex. As exhaust emission standards become increasingly stringent, the contribution of non-exhaust particulate matter from motor vehicles to atmospheric particulate matter is gradually increasing, especially with the promotion of new energy vehicles making non-exhaust particulate matter pollution a more prominent issue. Non-exhaust particulate matter emissions refer to particulate matter emissions related to vehicle operation other than exhaust emissions, such as tire wear particles, road wear particles, road resuspension particles, and brake wear particles. Compared with traditional vehicles, although new energy vehicles reduce exhaust emissions, they may lead to an increase in non-exhaust particulate matter emissions, especially in urban areas with high vehicle density and activity intensity. Strengthening research on testing non-exhaust particulate matter emissions from motor vehicles can provide technical support for reducing their harm to the urban atmospheric environment and human health, and has significant scientific importance and substantial social benefits.

[0003] Current research on non-exhaust particulate matter is limited, and most studies employ road simulators or experimental analysis methods. For example, Chinese invention patent application CN114018772A, published on February 8, 2022, discloses a non-exhaust particulate matter measuring device for light-duty vehicles. This device samples and analyzes tire wear particles and brake wear particles by fixing the test vehicle to a four-wheel drive drum. The measuring device includes a vehicle wheel rim particle collection unit, a non-exhaust particulate matter conveying pipe, and a CVS constant volume sampling system. The vehicle wheel rim particle collection unit includes an arc plate with a hollow cavity structure. The arc plate is installed on the edge of the wheel of the vehicle under test and has an airflow outlet. The inner wall of the arc plate has several hollow grooves that effectively collect particles generated at the wheel location. These particles are then conveyed to the CVS constant volume sampling system via the outlet of the non-exhaust particulate matter conveying pipe.

[0004] When a vehicle is actually in motion, different vehicle speeds will cause different flight trajectories of tire wear particles and road wear particles. As the vehicle speed increases, the angle at which non-exhaust gas particles generated by tire-road friction are emitted backward will be increased. The conventional fixed collection port mentioned above is not adaptable enough to the working conditions of vehicle speed changes. The distance between the collection port and the tire and the angle relative to the tire are fixed, making it difficult to place the collection port in a position with better collection effect relative to the tire, which will affect the reliability of the sampling results. Summary of the Invention

[0005] The purpose of this invention is to provide a non-exhaust gas particulate matter sampling device to solve the problem that current non-exhaust gas particulate matter sampling devices cannot adapt well to changes in vehicle speed, thus affecting the reliability of sampling results.

[0006] The technical solution of the non-exhaust gas particulate matter sampling device of the present invention is as follows:

[0007] A non-exhaust particulate matter sampling device includes a collection unit for setting around the tires of a vehicle under test and a sampling unit connected to the collection unit via a delivery pipe. The collection unit includes a collection port for collecting non-exhaust particulate matter generated during tire operation and a collection port adjustment unit connected to the collection unit. The collection port adjustment unit is used to adjust the position of the collection port relative to the tires of the vehicle under test.

[0008] Beneficial effects: This invention improves upon existing non-exhaust gas particulate matter sampling devices by setting up a collection port adjustment unit, which can adjust the position of the collection port according to the vehicle speed, so that the collection port matches the flight trajectory of non-exhaust gas particulate matter, thereby achieving the effect of effectively collecting non-exhaust gas particulate matter and helping to ensure the reliability of sampling results.

[0009] Furthermore, the collection port adjustment unit includes an angle adjustment unit and / or a linear distance adjustment unit. The angle adjustment unit is used to adjust the angle of the collection port toward the corresponding tire of the vehicle under test, and the linear distance adjustment unit is used to drive the collection port to move linearly to adjust the distance between the collection port and the center line of the tire of the vehicle under test.

[0010] Beneficial effect: The collection port can be adjusted as needed, making it easy to adjust the collection port.

[0011] Furthermore, the angle adjustment unit includes a mounting base and a rotary drive mechanism for driving the mounting base to rotate, and the linear distance adjustment unit is mounted on the mounting base.

[0012] Beneficial effect: The use of a rotatable mounting base to drive the linear distance adjustment unit to rotate helps to reduce the space occupied by the collection port adjustment unit in the vertical direction.

[0013] Furthermore, the collection unit includes a collection pipe, the opening of which constitutes a collection port. The collection pipe includes a guide pipe section, and the mounting base is provided with a slide that guides and cooperates with the guide pipe section. The linear distance adjustment unit includes a translation drive mechanism provided on the mounting base, which is used to drive the guide pipe section of the collection pipe to move along the slide.

[0014] Beneficial effects: The translation drive mechanism, in conjunction with the guide slide on the mounting base, restricts and supports the translational movement of the collection pipe, which is beneficial to reliable use.

[0015] Furthermore, the mounting base is a guide sleeve, the guide tube section passes through the guide sleeve, and the inner hole of the guide sleeve forms the slide.

[0016] Beneficial effects: The sleeve guides the collection tube, resulting in a simple structure and reliable support.

[0017] Furthermore, the collection unit includes a collection tube, the opening of which forms a collection port. The linear distance adjustment unit includes a support structure mounted on a mounting base. The support structure supports the collection tube and includes a pulley. The mounting base is also provided with a pulley drive mechanism for driving the pulley to rotate. The pulley contacts the collection tube and is used to drive the collection tube to translate during rotation.

[0018] Beneficial effect: The rotation of the pulley drives the collection tube to move horizontally, which helps to reduce the space occupied by the linear distance adjustment unit in the vertical direction.

[0019] Furthermore, the pulley and the collecting pipe are equipped with interlocking teeth.

[0020] Beneficial effects: The use of coupled teeth for transmission ensures stable force transmission and reliable operation.

[0021] Furthermore, the collection port adjustment unit includes a fixed base, and the angle adjustment unit includes a driving gear and a driven gear rotatably mounted on the fixed base. The rotary drive mechanism is connected to the driving gear, the driving gear meshes with the driven gear, and the driven gear constitutes the mounting base.

[0022] Beneficial effects: The meshing transmission between the driving gear and the driven gear can reduce the rotational speed of the mounting base and facilitate the control of the rotation angle.

[0023] Furthermore, the sampling unit has an on-board fixing structure for fixing with the vehicle, and a road impurity screening unit is provided on the delivery pipeline. The road impurity screening unit includes an air intake bend, which includes a horizontal air intake pipe section set upstream and a vertical air intake pipe section set downstream. A vertically extending baffle is provided at the junction of the horizontal air intake pipe section and the vertical air intake pipe section. The baffle is opposite to the inner cavity of the horizontal air intake pipe section, and a road impurity collection chamber is provided below the baffle.

[0024] Beneficial effects: Combining the sampling device with the vehicle under test forms an on-board non-exhaust particulate matter sampling device, which can sample the vehicle under test driving on actual roads. By collecting tire wear particles and road wear particles on actual roads, it can better reflect the actual road emission status of non-exhaust particulate matter. At the same time, the road impurity screening unit eliminates the influence of road impurities on the sampling results during the sampling process.

[0025] Furthermore, it also includes a road impurity removal unit, which is used to remove road impurities in front of the tires of the test vehicle in the direction of travel. The road impurity removal unit includes an air pump and a front air outlet connected to the air pump. The air pump is also connected to a tire blowing unit, which has a rear air outlet facing the tires of the test vehicle.

[0026] Beneficial effects: The road impurity removal unit pre-treats road surface impurities before sampling, removing the influence of road impurities and other particulate matter in the actual road environment on the sampling results, thus eliminating the need for background value sampling and analysis; moreover, the air pump of the road impurity removal unit is used as the air source for the tire blowing unit under test, and the tire blowing unit under test replaces the pre-treatment process before tire tread wear depth detection. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the non-exhaust gas particulate matter sampling device of the present invention when used in Embodiment 1;

[0028] Figure 2 for Figure 1 A schematic diagram of the collection unit in the diagram;

[0029] Figure 3 for Figure 1 A schematic diagram of the installation structure of the collection port adjustment unit and the rigid air intake pipe;

[0030] Figure 4 for Figure 2 A schematic diagram of the installation structure of the rigid air intake pipe and the guide mounting base;

[0031] Figure 5 for Figure 1 A schematic diagram of the road impurity blowing unit and the tire blowing unit under test;

[0032] Figure 6 for Figure 5 Side view;

[0033] Figure 7 This is a schematic diagram of the installation structure of the collection port adjustment unit and the rigid air inlet pipe in Embodiment 2 of the non-exhaust gas particulate matter sampling device of the present invention.

[0034] Figure 8 for Figure 7 A schematic diagram of the installation structure of the pulley and rigid air intake pipe.

[0035] In the diagram: 100. Test vehicle; 11. Collection head; 12. Rigid air intake pipe; 13. Air intake hose; 21. Fixed base; 22. Intelligent control module; 15. First fixing rod; 16. Second fixing rod; 17. First motor; 18. Guide mounting seat; 19. Electric push rod; 25. Drive gear; 26. Driven gear; 27. Pulley; 28. Second motor; 29. ​​Third motor; 31. Horizontal air intake pipe section; 32. Road debris collection bag; 33. Baffle; 4. Air supply unit; 41. Suction air pump; 5. Sampling unit; 51. TSP particulate sampler; 52. Connecting hose; 6. Road debris blowing unit; 61. Blowing air pump; 62. Front air outlet; 7. Test tire blowing unit; 71. Air gun; 8. Small weather station; 9. Monitoring module. Detailed Implementation

[0036] Example 1 of the non-exhaust gas particulate matter sampling device of the present invention:

[0037] In this embodiment, by setting a collection port adjustment unit, the position of the collection port can be adjusted according to the vehicle speed, so that the collection port matches the flight trajectory of non-exhaust gas particles, thereby achieving the effect of effectively collecting non-exhaust gas particles and ensuring the reliability of the sampling results.

[0038] Specifically, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the non-exhaust particulate matter sampling device is vehicle-mounted and installed on the corresponding test vehicle 100. It can collect non-exhaust particulate matter generated by the friction between the corresponding test tire and the road surface of the test vehicle 100 when the vehicle is driving on the actual road. The non-exhaust particulate matter includes tire wear particulate matter and road wear particulate matter.

[0039] The non-exhaust gas particulate matter sampling device includes a collection unit, a collection port adjustment unit, a road impurity screening unit, an air supply unit 4, a sampling unit 5, a road impurity blowing unit 6, a tire blowing unit 7, a small weather station 8, and a monitoring module 9.

[0040] The collection unit is located behind the tire being tested. The collection unit includes a collection tube comprising a collection head 11, a rigid air intake pipe 12, and an air intake hose 13. The collection head 11 is trumpet-shaped and has a conical cavity. The end of the conical cavity with the larger diameter forms the collection opening, which faces the contact point between the tire and the road surface. The end of the collection head 11 furthest from the collection opening is threadedly connected to one end of the rigid air intake pipe 12. The rigid air intake pipe 12 includes a long section and a short section arranged at an angle. The collection head 11 is connected to the ends of both sections. The end of the short section is connected to the air intake hose 13, which is connected to a road impurity screening unit. The air intake hose 13 is a TEFLON hose. The collection head 11 is detachable for easy replacement according to different tire widths, ensuring sampling effectiveness.

[0041] The road impurity screening unit includes an air intake bend, a road impurity collection bag 32, and a baffle 33. The air intake bend includes a horizontal air intake pipe section 31 located upstream and a vertical air intake pipe section located downstream. The horizontal air intake pipe section 31 extends in the front-to-back direction. One end of the horizontal air intake pipe section 31 is connected to the air intake hose 13, and the other end is connected to the vertical air intake pipe section. The vertical air intake pipe section extends in the up-down direction. The road impurity collection bag 32 is located at the connection between the horizontal air intake pipe section 31 and the vertical air intake pipe section and communicates with the space inside the pipe. The inner cavity of the road impurity collection bag 32 constitutes a road impurity collection chamber. The road impurity collection bag is removable for cleaning and replacement. A baffle 33 is also provided at the junction of the vertical intake pipe section and the horizontal intake pipe section 31. The baffle 33 extends in the vertical direction and is located on the side of the vertical intake pipe section away from the horizontal intake pipe section 31. The baffle 33 is horizontally opposite to the cavity of the horizontal intake pipe section 31. The baffle 33 is vertically installed at the bend of the pipe so that road impurities can collide with the baffle 33 inside the pipe and be deposited into the road impurity collection bag 32 under the action of gravity, and be separated from the non-exhaust gas particulate matter, preventing impurities in the collected non-exhaust gas particulate matter from entering the subsequent air supply unit 4 and sampling unit 5.

[0042] The air supply unit 4 includes a suction pump 41. The road impurity screening unit is connected to the inlet of the suction pump 41 through a corresponding pipeline. The suction pump 41 of the air supply unit 4 can adjust the power of the equipment to control the airflow speed. The suction pump 41 is used to perform negative pressure suction to suck non-exhaust gas particles into the collection port.

[0043] The sampling unit 5 has an on-board mounting structure for fixing to the vehicle. The sampling unit 5 includes a TSP particulate sampler 51, which is connected to the air pump outlet via a connecting hose 52. The TSP particulate sampler 51 contains a filter membrane, on which particulate matter is trapped, completing the sampling process. Corresponding pipelines between the sampling unit 5 and the collection unit form a delivery pipeline, which transports the collected non-exhaust gas particulate matter to the sampling unit 5.

[0044] The collection port adjustment unit includes a fixed base 21, an intelligent control module 22, an angle adjustment unit, and a linear distance adjustment unit. The fixed base 21 serves as the mounting base for the collection adjustment unit. It is fixed to the vehicle chassis, possibly using magnetic attachment. The fixed base 21 is fixed to the vehicle floor or a smooth surface. The fixed base 21 includes a block-shaped base and a first fixing rod 15 and a second fixing rod 16 fixed to the base. Both the first fixing rod 15 and the second fixing rod 16 extend vertically and are spaced apart horizontally. The angle adjustment unit and the linear distance adjustment unit are located between the first fixing rod 15 and the second fixing rod 16. The intelligent control module 22 controls the operation of the angle adjustment unit and the linear distance adjustment unit. The angle adjustment unit adjusts the angle between the collection port and the ground, thereby adjusting the angle of the collection port towards the tire. The linear distance adjustment unit adjusts the distance between the collection port and the centerline of the tire of the vehicle being tested, thereby adjusting the height of the collection port above the ground.

[0045] The angle adjustment unit includes a first motor 17 and a guide mounting base 18. The first motor 17 constitutes a rotary drive mechanism for driving the guide mounting base 18 to rotate. The first motor 17 is fixed on the first fixed rod 15. The guide mounting base 18 is a guide sleeve. One side of the guide mounting base 18 is fixed on the output shaft of the first motor 17 and controlled by it to rotate. The other side is connected to a rotatable connecting rod. The rotatable connecting rod is on the same horizontal line as the output shaft of the first motor 17. The rotatable connecting rod is mounted on the second fixed rod 16. The rotation axis of the guide mounting base 18 extends in the left and right direction. The guide mounting base 18 is provided with a guide channel adapted to the long section of the rigid air intake pipe 12. The guide channel is formed by the inner hole of the guide sleeve. The long section of the rigid air intake pipe 12 constitutes the guide pipe section. The guide pipe section is inserted into the guide channel, so that the rigid air intake pipe 12 rotates with the rotation of the guide mounting base 18.

[0046] The linear distance adjustment unit includes an electric push rod 19 fixed on the guide mounting base 18. The electric push rod 19 is fixed to the outside of the guide channel, and its retractable head is fixed to the rigid air intake pipe 12 to drive the rigid air intake pipe 12 to achieve linear extension and retraction within the guide channel. The guide channel forms a slide, and the electric push rod 19 constitutes a translation drive mechanism for guiding the guide pipe section of the collection pipe along the slide. The intake hose 13 between the rigid air intake pipe 12 and the horizontal air intake pipe section 31 facilitates the movement of the rigid air intake pipe 12 to adjust the position of the collection port according to vehicle speed. Since the rotation angle and adjustment height of the collection port have a small practical range, they do not affect the arrangement of related wiring harnesses.

[0047] The road debris blowing unit 6 and the tire blowing unit 7 are located at the front of the vehicle and in front of the tire being tested. The road debris blowing unit 6 constitutes a road debris removal unit. The road debris blowing unit 6 includes a housing and a blower 61 installed inside the housing. The housing has a front air outlet 62. The air pumped by the blower 61 is blown out through the front air outlet 62 to remove road debris in front of the tire of the vehicle being tested 100 in the direction of travel. The front air outlet 62 of the road debris blowing unit 6 is flat and tilted towards the ground to achieve the maximum cleaning efficiency of the road surface.

[0048] The road impurity blowing unit 6 and the tire under test blowing unit 7 share the same air pump 61. The tire under test blowing unit 7 is connected to an external air gun 71. The air gun 71 has a rear air outlet facing backward. The air pumped out by the air pump can also be blown backward through the air gun 71. The air gun 71 is used to clean the tire tread before measuring the tire wear depth. The air gun 71 is angled upward toward the tire under test to facilitate cleaning the tire tread.

[0049] The small weather station 8 and the monitoring module 9 are installed on the roof and windshield of the vehicle, respectively. The monitoring module 9 includes a GPS and a driving recorder. The small weather station 8, GPS and driving recorder are turned on in real time during the sampling process to facilitate real-time monitoring and recording of meteorological and geographical parameters related to the sampling environment.

[0050] Before actual road testing, the collection head 11 of the appropriate size is replaced according to the tire width of the vehicle being tested to obtain a collection port of suitable size. When the vehicle being tested 100 is driving on actual roads, the road surface area in front of the tire being tested is swept by the blowing air pump 61 of the road impurity blowing unit 6. Non-exhaust gas particles generated by the friction between the tire being tested and the road surface are input into the collection port by the suction air pump 41, and enter the intake bend through the rigid intake pipe 12 and the intake hose 13. Among them, large particles such as road impurities in the non-exhaust gas particles collide with the baffle 33 inside the pipe and are deposited into the road impurity collection bag 32 by gravity, thus separating from the non-exhaust gas particles. The non-exhaust gas particles continue to be captured by the suction air pump 41 and then through the connecting hose 52 onto the filter membrane in the TSP particulate sampler 51, completing the sampling process. During the test, as the vehicle 100 is moving, the angle at which non-exhaust particulate matter generated by the friction between the tires and the ground is emitted backward will be raised as the vehicle speed increases. At this time, the intelligent control module 22 of the collection port adjustment unit will sense the speed change and send instructions to the angle adjustment unit and the linear distance adjustment unit, which will drive the rigid air intake pipe 12 to perform corresponding rotation and translation movements. By changing the angle and height of the rigid air intake pipe 12, the position of the collection port will be adjusted to achieve the best collection effect.

[0051] When the tested vehicle 100 is driving on actual roads, the road impurity removal unit pre-treats the road surface impurities before sampling, removing the influence of road impurities and other particulate matter in the actual road environment on the sampling results, thus eliminating the need for background value sampling and analysis. Through the collection port adjustment unit, the collection port adjusts its position (angle and height) with the vehicle speed during driving, thereby increasing sampling efficiency and ensuring sampling reliability. The installation of a road impurity collection bag 32, combined with the conveying pipeline structure, eliminates the influence of road impurities during the sampling process.

[0052] When measuring the tire wear depth of the vehicle being tested, the air gun of the tire cleaning unit cleans the tire, which is a pretreatment for the subsequent measurement of tire wear depth. This replaces the pretreatment process before tire tread wear depth detection. The air gun and the road impurity cleaning process share the same air pump, achieving the effect of one pump for two purposes and saving machine and cleaning costs.

[0053] After actual road testing, the collected samples represent the sum of tire wear particles and road wear particles over the total test mileage. Based on this, the total wear amount W per unit kilometer of tire wear particles and road wear particles is calculated. 总 To analyze the proportion of wear of two types of non-exhaust gas particulate matter in a sample, a calculation and analysis method is provided here: The tire wear depth d is obtained by measuring the wear depth of the tested tire after pretreatment with an air gun using a laser tread wear detector or a depth gauge. T The tire wear particulate matter mass per unit mileage is calculated using the following formulas ① and ②, and the wear amount W of the tire wear particulate matter collected from the test sample is calculated based on the test mileage. T Finally, the road wear particulate matter wear amount W can be obtained by subtracting the calculated total tire wear particulate matter from the total non-exhaust gas particulate matter in the test sample using formula ③. R This allows for proportion analysis.

[0054] ①V=d T ·w·r·25.4+w·A r ·3.14)·1-V r )

[0055] V – Tire wear volume, mm 3 ;d T — Tread depth loss, mm; W — Tire width, mm; r — Tire diameter, inches; A r — Aspect ratio (tire thickness / tire width); V r — Void ratio (tire tread pattern / tread surface area).

[0056] ②W T =2ρV / d

[0057] W T—Wear amount per unit kilometer of a single tire, mg; ρ —Tire tread density, mg / mm² 3 d – Distance traveled, km; V – Tire loss volume, mm 3 .

[0058] ③W R =W 总 -W T

[0059] W R —Particulate matter wear rate per unit kilometer of road, mg; W 总 —Total wear amount of tire wear particles and road wear particles per unit kilometer, mg; W T —Wear amount per unit kilometer of a single tire, in mg.

[0060] Example 2 of the non-exhaust gas particulate matter sampling device of the present invention:

[0061] This embodiment provides a different structural form of the collection port adjustment unit than that of Embodiment 1. The difference lies in that, in Embodiment 1, the guide mounting base is provided with a slide rail that guides and engages with the guide section of the rigid air intake pipe, and the linear distance adjustment unit includes a translation drive mechanism mounted on the mounting base. This translation drive mechanism is used to drive the guide section of the collection pipe to move along the slide rail. In this embodiment, as... Figure 7 , Figure 8As shown, the angle adjustment unit includes a second motor 28, a third motor 29, a driving gear 25, and a driven gear 26. The driving gear 25 and driven gear 26 mesh with each other. The second motor is fixed to the first fixed rod 15. The output shaft of the second motor 28 and the central axis of the driving gear 25 are on the same horizontal line. The central axis of the driving gear 25 is mounted on the second fixed rod 16, and the second motor drives the driving gear to rotate. The central axis of the driven gear 26 is rotatably mounted on the first fixed rod 15 and the second fixed rod 16. The long section of the rigid air intake pipe 12 is mounted on one side of the driven gear 26 and rotates with the driven gear 26. The linear distance adjustment unit includes a third motor 29 and a pulley 27. The third motor 29 is fixed to the surface of the driven gear 26 away from the rigid air intake pipe. The rotating shaft passes through the driven gear 26 via an opening on its surface. Two pulleys 27 are mounted on the side of the driven gear facing the rigid air intake pipe. The corresponding section of the rigid air intake pipe extends between the two pulleys 27 and contacts them. There is one third motor 29. The output shaft of the third motor 29 and the central shaft of one of the pulleys are fixed on the same horizontal line. The other pulley is movably positioned. As the rigid air intake pipe rotates and translates, the two pulleys 27 are tightly connected to the surface of the rigid air intake pipe 12. The pulleys 27 and the surface of the rigid air intake pipe 12 are arranged with coupling teeth to realize the transmission between the pulleys 27 and the rigid air intake pipe 12, thereby realizing the translational movement of the rigid air intake pipe 12. Since the rotation angle and adjustment height of the collection port have a small actual operating range, the driving gear 25 and the driven gear 26 can be set as a half-tooth structure. The two pulleys form a support structure, and the third motor forms a pulley drive mechanism.

[0062] Example 3 of the non-exhaust gas particulate matter sampling device of the present invention:

[0063] This embodiment provides a different configuration of the collection port adjustment unit than Embodiment 1. The difference between this embodiment and Embodiment 1 is that the collection port adjustment unit in Embodiment 1 includes an angle adjustment unit and a linear distance adjustment unit. In this embodiment, the collection port adjustment unit is an angle adjustment unit, which only has the function of adjusting the angle between the orientation of the collection port and the horizontal direction.

[0064] Example 4 of the non-exhaust gas particulate matter sampling device of the present invention:

[0065] This embodiment provides a different configuration of the collection port adjustment unit than that of Embodiment 1. The difference lies in that the angle adjustment unit in Embodiment 1 includes a mounting base and a rotary drive mechanism for driving the mounting base to rotate, and the linear distance adjustment unit is mounted on the mounting base. In this embodiment, the linear distance adjustment unit includes a vertically extending guide rail and a lifting seat that can move on the guide rail. The angle adjustment unit is mounted on the lifting seat and includes a support rotatably mounted on the lifting seat. The support is fixed to a rigid air intake pipe, and the lifting seat is equipped with a rotary drive mechanism for driving the support to rotate.

[0066] Example 5 of the non-exhaust gas particulate matter sampling device of the present invention:

[0067] This embodiment provides a different linear distance adjustment unit configuration than Embodiment 1. The difference lies in that, in Embodiment 1, the collection tube includes a guide tube segment, the mounting base of the angle adjustment unit has a slide rail that guides and cooperates with the guide tube segment, and the linear distance adjustment unit includes a translation drive mechanism mounted on the mounting base. This translation drive mechanism is used to drive the guide tube segment of the collection tube to move along the slide rail, and the translation drive mechanism is an electric push rod. In this embodiment, however, the fixed base of the electric push rod is fixed to the mounting base of the angle adjustment unit, and the movable rod of the electric push rod is fixed to the rigid air intake pipe and drives the rigid air intake pipe to move.

[0068] Example 6 of the non-exhaust gas particulate matter sampling device of the present invention:

[0069] This embodiment provides a pulley arrangement different from that of Embodiment 1. The difference lies in that, in Embodiment 1, the pulley and the collecting tube are equipped with mutually coupled teeth. In this embodiment, the pulley is a rubber roller, the surface of the collecting tube is rough, and the pulley drives the collecting tube to move horizontally through friction.

[0070] Example 7 of the non-exhaust gas particulate matter sampling device of the present invention:

[0071] This embodiment provides a different configuration of the road impurity removal unit than Embodiment 1. The difference between this embodiment and Embodiment 1 is that in Embodiment 1, a road impurity removal unit is provided in front of the tire being tested. In this embodiment, however, no road impurity removal unit is provided; instead, the road impurity is removed solely by a road impurity screening unit on the conveying pipeline.

[0072] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A non-exhaust particulate matter sampling device, comprising a collection unit for placement around the tires of a vehicle under test, and a sampling unit connected to the collection unit via a delivery pipe, characterized in that, The collection unit includes a collection head located behind the tire during use. The collection head has a conical cavity, and the larger end of the conical cavity forms a collection port for collecting non-exhaust particulate matter generated during tire travel. The non-exhaust particulate matter sampling device also includes a collection port adjustment unit connected to the collection unit. The collection port adjustment unit is used to adjust the position of the collection port relative to the tire of the vehicle being tested. The collection port adjustment unit includes an angle adjustment unit and a linear distance adjustment unit. The angle adjustment unit is used to adjust the angle of the collection port toward the tire, and the linear distance adjustment unit is used to drive the collection port to move linearly to adjust the distance between the collection port and the tire centerline. The non-exhaust particulate matter sampling device includes a road impurity removal unit. The road impurity removal unit includes an air pump and a front air outlet connected to the air pump. The road impurity removal unit is used to blow away road impurities in front of the tire's travel direction through the front air outlet.

2. The non-exhaust gas particulate matter sampling device according to claim 1, characterized in that, The angle adjustment unit includes a mounting base and a rotary drive mechanism for driving the mounting base to rotate, and the linear distance adjustment unit is mounted on the mounting base.

3. The non-exhaust gas particulate matter sampling device according to claim 2, characterized in that, The collection unit includes a collection tube, which includes the collection head and a guide tube section. The mounting base is provided with a slide that guides and cooperates with the guide tube section. The linear distance adjustment unit includes a translation drive mechanism provided on the mounting base. The translation drive mechanism is used to drive the guide tube section of the collection tube to move along the slide.

4. The non-exhaust gas particulate matter sampling device according to claim 3, characterized in that, The mounting base is a guide sleeve, and the guide tube section passes through the guide sleeve. The inner hole of the guide sleeve forms the slide.

5. The non-exhaust gas particulate matter sampling device according to claim 2, characterized in that, The collection unit includes a collection tube, which includes the collection head. The linear distance adjustment unit includes a support structure mounted on a mounting base. The support structure supports the collection tube and includes a pulley. The mounting base is also provided with a pulley drive mechanism for driving the pulley to rotate. The pulley contacts the collection tube and is used to drive the collection tube to translate during rotation.

6. The non-exhaust gas particulate matter sampling device according to claim 5, characterized in that, The pulley and the collecting pipe are equipped with interlocking teeth.

7. The non-exhaust gas particulate matter sampling device according to claim 2, characterized in that, The collection port adjustment unit includes a fixed base, and the angle adjustment unit includes a driving gear and a driven gear rotatably mounted on the fixed base. The rotary drive mechanism is connected to the driving gear, and the driving gear meshes with the driven gear. The driven gear constitutes the mounting base.

8. The non-exhaust gas particulate matter sampling device according to any one of claims 1-7, characterized in that, The sampling unit has a vehicle-mounted fixing structure for fixing to the vehicle. The conveying pipeline is equipped with a road impurity screening unit. The road impurity screening unit includes an air intake bend, which includes a horizontal air intake pipe section set upstream and a vertical air intake pipe section set downstream. A vertically extending baffle is provided at the junction of the horizontal air intake pipe section and the vertical air intake pipe section. The baffle is opposite to the inner cavity of the horizontal air intake pipe section. A road impurity collection chamber is provided below the baffle.

9. The non-exhaust gas particulate matter sampling device according to claim 8, characterized in that, The air pump is also connected to a tire-blowing unit, which has a rear air outlet facing the tires of the vehicle being tested.

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