Dust for vehicle dust hole dustproof sealing performance test and vehicle dust hole dustproof sealing performance test device

Abstract

The invention discloses a dust for a dustproof sealing test of a vehicle dust hole and a dustproof sealing test device of the vehicle dust hole, and relates to the technical field of automobiles. Comprising a first particle, a second particle, a third particle, a fourth particle and a fifth particle which are different in particle size, wherein Dv90 of the first particle is larger than or equal to 0.01 mm, Dv90 of the second particle is smaller than Dv90 of the third particle, Dv90 of the fourth particle is larger than Dv90 of the fifth particle, and Dv90 of the fifth particle is smaller than or equal to 50 mm. The first particles, the second particles, the third particles, the fourth particles and the fifth particles with gradually increased particle sizes can simulate an actual road driving dust environment of an automobile more truly and stably, and improve the dust environment stability of a dust hole dustproof sealing test. The transverse comparison of the dustproof performance of different vehicles or vehicles at different development stages is more effective, and meanwhile, the adverse effects of unconventional dust invasion and test safety in the original scheme are solved.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to dust for testing the dustproof and sealing properties of a vehicle dust hole and a vehicle dust hole dustproof and sealing properties testing device. Background Art

[0002] Some automakers or third-party testing agencies have constructed dust tunnels within their vehicle testing grounds for vehicle dust and seal testing. However, the dust tunnel environment differs significantly from the actual dusty road conditions experienced by users. The dust environment inside the dust tunnel is unstable, resulting in inconsistent dust generation during consecutive tests, impacting the consistency of test results. Consequently, the conditions for continuous testing are not met. Excessive dust can splash and intrude onto the vehicle during driving, affecting actual test results. Poor dust removal from the tires can easily cause the vehicle to skid, making the test highly dangerous. Summary of the Invention

[0003] The present application provides dust for testing the dustproof sealing performance of a vehicle dust hole and a vehicle dust hole dustproof sealing performance test device, so as to improve a series of problems caused by the unstable dust environment in the existing dust hole and the large difference between the dust environment in the user's actual road environment.

[0004] In a first aspect, the present application provides dust for testing the dustproof sealing performance of a vehicle dust hole, including first particles, second particles, third particles, fourth particles, and fifth particles of different particle sizes, wherein: 0.01mm≤Dv of the first particle 90 <Dv of the second particle 90 <Dv of the third particle 90 <Dv of the fourth particle 90 <Dv of the fifth particle 90 ≤50mm.

[0005] When a vehicle is driving in a dust hole filled with pure dust, the vehicle tires do not discharge dust well, which can easily cause the vehicle to skid, making the test highly dangerous. In addition, the dust environment in the dust hole is unstable, and the consistency of dust emission is very poor when conducting continuous tests, resulting in large data differences and poor reproducibility in parallel experiments. The present application uses first particles, second particles, third particles, fourth particles, and fifth particles with gradually increasing particle sizes to more realistically and stably simulate the actual road driving dust environment of a car, improve the dust environment stability problem in the dust hole dustproof sealing test, and make the horizontal comparison of the dustproof performance of different vehicles or vehicles at different development stages more effective, while solving the adverse effects of unconventional dust intrusion and test safety in the original solution.

[0006] Particle Dv 90The upper limit is no more than 50mm, which does not affect the trafficability of general passenger cars, inhibits tire slippage, and does not affect the mechanical agitation between the tires and the road surface when the car is driving, effectively accommodating other small particles and making them easy to lift. 90 A lower limit of no less than 0.01 mm can avoid dust simulation distortion. In general road dust, particles below 0.01 microns account for less than 10%, and the particle size distribution of dust particles on general dusty roads is generally less than 0.01~0.1 mm, accounting for more than 90%.

[0007] It should be noted that the particle Dv 90 Refers to the diameter of dust particles, DV 90 Indicates the particle size value corresponding to the cumulative volume proportion of 90% in the volume distribution of the particle sample, which means that in the particle group, 90% of the particle volume is less than or equal to DV 90 The remaining 10% of the volume is composed of 90 The particle composition, particle Dv 90 Construction or industrial granular materials that can be measured by sieve analysis, water analysis, microscopy, etc. or have a size report issued using a three-party test.

[0008] In some embodiments, the Dv of the first particle is 90 The Dv of the first particle is 0.01mm~0.1mm. 90 Within this range, the main dust particle diameters of common dust roads can be simulated. The particle size distribution of dust particles on general dust roads is generally less than 0.01~0.1 mm, accounting for more than 90%.

[0009] In some embodiments, the Dv of the second particle is 90 The Dv of the second particle is 0.1mm~4mm. 90 Within this range, the fine sand components in common dusty roads can be simulated and are the main inclusion items of the first particles.

[0010] In some embodiments, the Dv of the third particle is 90 The Dv of the third particle is 4mm~10mm. 90 Within this range, the fine gravel components in common dusty roads can be simulated, and are the main inclusions of the first and second particles.

[0011] In some embodiments, the Dv of the fourth particle is 90 The Dv of the fourth particle is 10mm~15mm. 90 Within this range, the medium gravel component in common dust roads can be simulated, and it is the main inclusion of the first, second and third particles.

[0012] In some embodiments, the Dv of the fifth particle is 90 The Dv of the fifth particle is 15mm~50mm. 90 This range simulates the large gravel and crushed stone commonly found on dusty roads, and is the primary inclusion for the first, second, third, and fourth particles. The size of the fifth particle is also chosen to ensure good vehicle passability at speeds between 20 and 60 km / h.

[0013] In some embodiments, the material of the first particles includes at least one of silicon dust and ceramic powder. The material of the first particles is selected from at least one of the above materials to simulate a more realistic dust effect; and / or, The material of the second particles includes at least one of fine sand, medium sand and coarse sand. The material of the second particles is at least one of the above materials, which can simulate a more realistic dust effect; and / or, The material of the third particles includes fine gravel. The use of fine gravel as the material of the third particles can simulate a more realistic dust effect and increase the encapsulation of fine dust; and / or, The material of the fourth particles includes medium gravel. The use of medium gravel as the material of the fourth particles can improve vehicle trafficability, reduce slippage, and increase the encapsulation of fine dust; and / or, The material of the fifth particles includes coarse gravel. The use of coarse gravel as the material of the fifth particles can improve the vehicle's passability and reduce slipping.

[0014] In some embodiments, the mass ratio of the first, second, third, fourth, and fifth particles is (2-5): (15-25): (35-40): (30-40): (2-5). Within this range, the mass ratio of the first, second, third, fourth, and fifth particles can reduce vehicle slippage while simulating a real dust environment, thereby increasing the credibility of test results.

[0015] In some embodiments, the mass ratio of the first, second, third, fourth, and fifth particles is (3.5-4.5): (18-20): (37-39): (34-36): (3.5-4.5). Within this range, the mass ratio of the first, second, third, fourth, and fifth particles can further simulate a real dust environment while adjusting the amount of dust raised, reducing vehicle slippage and improving the credibility of the test results.

[0016] In a second aspect, the present application provides a vehicle dust hole dustproof sealing test device, comprising the dust for the vehicle dust hole dustproof sealing test described in the first aspect. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of this application without making any creative efforts shall fall within the scope of protection of this application.

[0018] Some automakers or third-party testing agencies have constructed dust tunnels within their vehicle testing grounds for vehicle dust and seal testing. However, the dust tunnel environment differs significantly from the actual dusty road conditions experienced by users. The unstable dust environment within the dust tunnel leads to inconsistent dust generation during consecutive tests, impacting the consistency of test results. Consequently, the conditions for continuous testing are not met. Excessive dust can splash and intrude onto the vehicle during driving, affecting actual test results. Poor dust removal from the tires can easily cause the vehicle to skid, making the test highly dangerous.

[0019] In view of this, the present application provides a dust for testing the dustproof sealing performance of a vehicle dust hole and a vehicle dust hole dustproof sealing performance test device to improve a series of problems caused by the unstable dust environment in the existing dust hole and the large difference between the dust environment in the user's actual road environment.

[0020] In a first aspect, the present application provides dust for testing the dustproof sealing performance of a vehicle dust hole, including first particles, second particles, third particles, fourth particles, and fifth particles of different particle sizes, wherein: 0.01mm≤Dv of the first particle 90 <Dv of the second particle 90 <Dv of the third particle 90 <Dv of the fourth particle 90 <Dv of the fifth particle 90 ≤50mm.

[0021] When a vehicle is driving in a dust hole filled with pure dust, the vehicle tires do not discharge dust well, which can easily cause the vehicle to skid sideways, making the test highly dangerous. In addition, the dust environment in the dust hole is unstable, and the consistency of dust emission is very poor when conducting continuous tests, resulting in large differences in consistency of experimental data and poor repeatability. The present application uses first particles, second particles, third particles, fourth particles, and fifth particles with gradually increasing particle sizes to more realistically and stably simulate the actual road driving dust environment of a car, improve the dust environment stability problem in the dust hole dustproof sealing test, and make the horizontal comparison of the dustproof performance of different vehicles or vehicles at different development stages more effective, while solving the adverse effects of unconventional dust intrusion and test safety in the original solution.

[0022] Particle Dv 90The upper limit is no more than 50mm, which does not affect the trafficability of general passenger cars, inhibits tire slippage, and does not affect the mechanical agitation between the tires and the road surface when the car is driving, effectively accommodating other small particles and making them easy to lift. 90 The lower limit of not less than 0.01 mm can effectively simulate the main particles of real road dust. Generally, the particles below 0.01 microns in highway dust are less than 10%, and the particle size distribution of dust particles on dusty roads is generally less than 0.01~0.1 mm, accounting for more than 90%.

[0023] It should be noted that the particle Dv 90 Refers to the diameter of dust particles, DV 90 Indicates the particle size value corresponding to the cumulative volume proportion of 90% in the volume distribution of the particle sample, which means that in the particle group, 90% of the particle volume is less than or equal to DV 90 The remaining 10% of the volume is composed of 90 The particle composition, particle Dv 90 It can be measured by sieve analysis, water analysis, microscopy, etc.

[0024] In combination with the first aspect, in some embodiments provided herein, the Dv of the first particle is 90 The Dv of the first particle is 0.01mm~0.1mm. 90 Within this range, the main dust particle diameters of common dust roads can be simulated. The particle size distribution of dust particles on general dust roads is generally less than 0.01~0.1 mm, accounting for more than 90%.

[0025] In combination with the first aspect, in some embodiments provided herein, the Dv of the second particle is 90 The Dv of the second particle is 0.1mm~4mm. 90 Within this range, the fine sand components in common dusty roads can be simulated and are the main inclusion items of the first particles.

[0026] In combination with the first aspect, in some embodiments provided in this application, the Dv of the third particle is 90 The Dv of the third particle is 4mm~10mm. 90 Within this range, the fine gravel components in common dusty roads can be simulated, and are the main inclusions of the first and second particles.

[0027] In combination with the first aspect, in some embodiments provided herein, the Dv of the fourth particle is 90 The Dv of the fourth particle is 10mm~15mm. 90Within this range, the medium gravel component in common dust roads can be simulated, and it is the main inclusion of the first, second and third particles.

[0028] In combination with the first aspect, in some embodiments provided in this application, the Dv of the fifth particle is 90 The Dv of the fifth particle is 15mm~50mm. 90 Within this range, large gravel and crushed stone found on common dusty roads can be simulated, serving as the primary inclusions for the first, second, third, and fourth particles. The size of the fifth particle is also chosen to ensure good vehicle passability at speeds between 20 and 60 km / h.

[0029] In combination with the first aspect, in some embodiments provided in the present application, the material of the first particles includes at least one of silicon dust and ceramic powder. The material of the first particles is selected from at least one of the above materials, which can simulate a more realistic dust effect.

[0030] In combination with the first aspect, in some embodiments provided in the present application, the material of the second particles includes at least one of fine sand, medium sand and coarse sand. The material of the second particles is selected from at least one of the above materials, which can simulate a more realistic dust effect.

[0031] In combination with the first aspect, in some embodiments provided in the present application, the material of the third particles includes fine gravel. The use of fine gravel as the material of the third particles can simulate a more realistic dust effect.

[0032] In combination with the first aspect, in some embodiments provided in the present application, the material of the fourth particles includes medium gravel. The material of the fourth particles includes medium gravel. The selection of medium gravel as the material of the fourth particles can improve vehicle passability and reduce slipping.

[0033] In combination with the first aspect, in some embodiments provided in the present application, the material of the fifth particles includes coarse gravel. The use of coarse gravel as the material of the fifth particles can improve vehicle passability and reduce slipping.

[0034] In conjunction with the first aspect, in some embodiments provided herein, the mass ratio of the first, second, third, fourth, and fifth particles is (2-5): (15-25): (35-40): (30-40): (2-5). Within this range, the mass ratio of the first, second, third, fourth, and fifth particles can reduce vehicle slippage while simulating a real dust environment, thereby increasing the credibility of test results.

[0035] In conjunction with the first aspect, in some embodiments provided herein, the mass ratio of the first, second, third, fourth, and fifth particles is (3.5-4.5): (18-20): (37-39): (34-36): (3.5-4.5). Within this range, the mass ratio of the first, second, third, fourth, and fifth particles can further reduce vehicle slippage while simulating a real dust environment, thereby increasing the credibility of the test results.

[0036] In a second aspect, the present application provides a vehicle dust hole dustproof and sealing test device, comprising the vehicle dust hole dustproof and sealing test dust described in the first aspect. The vehicle dust hole dustproof and sealing test device incorporates all the technical solutions of the vehicle dust hole dustproof and sealing test dust, and thus possesses all the beneficial effects of the vehicle dust hole dustproof and sealing test dust, which are not further detailed herein.

[0037] The technical solution provided in this application is described in detail below with reference to embodiments.

[0038] Example 1 Example 1 of the present application provides dust for testing the dustproof sealing performance of a vehicle dust hole, including: Dv 90 Silicon dust particles of 0.01mm~0.1mm (first particles); Dv 90 Fine sand particles (second particles) of 0.1mm~4mm; Dv 90 Fine gravel particles of 4mm~10mm (third particles); Dv 90 Medium gravel particles (fourth particles) with a size of 10mm to 15mm; Dv 90 Crushed stone particles of 15mm~50mm (fifth particles); The mass ratio of the first particles, the second particles, the third particles, the fourth particles and the fifth particles is 2:15:35:30:2.

[0039] Example 2 Example 2 of the present application provides dust for testing the dustproof sealing performance of a vehicle dust hole, including: Dv 90 Silicon dust particles of 0.01mm~0.1mm (first particles); Dv 90 Fine sand particles (second particles) of 0.1mm~4mm; Dv 90 Fine gravel particles of 4mm~10mm (third particles); Dv 90 Medium gravel particles (fourth particles) with a size of 10mm to 15mm; Dv 90 Crushed stone particles of 15mm~50mm (fifth particles); The mass ratio of the first particles, the second particles, the third particles, the fourth particles and the fifth particles is 5:25:40:40:5.

[0040] Example 3 Example 3 of the present application provides dust for testing the dustproof sealing performance of a vehicle dust hole, including: Dv 90 Ceramic powder particles (first particles) of 0.01mm~0.1mm; Dv 90 Medium sand particles (second particles) with a size of 0.1mm to 4mm; Dv 90 Fine gravel particles of 4mm~10mm (third particles); Dv 90 Medium gravel particles (fourth particles) with a size of 10mm to 15mm; Dv 90 Crushed stone particles of 15mm~50mm (fifth particles); The mass ratio of the first particles, the second particles, the third particles, the fourth particles and the fifth particles is 3.5:18:37:34:3.5.

[0041] Example 4 Example 4 of the present application provides dust for testing the dustproof sealing performance of a vehicle dust hole, including: Dv 90 Silicon dust particles of 0.01mm~0.1mm (first particles); Dv 90 Coarse sand particles (second particles) with a size of 0.1mm to 4mm; Dv 90 Fine gravel particles of 4mm~10mm (third particles); Dv 90 Medium gravel particles (fourth particles) with a size of 10mm to 15mm; Dv 90 Crushed stone particles of 15mm~50mm (fifth particles); The mass ratio of the first particles, the second particles, the third particles, the fourth particles and the fifth particles is 4.5:20:39:36:4.5.

[0042] Example 5 Example 5 of the present application provides dust for testing the dustproof sealing performance of a vehicle dust hole, including: Dv 90 Silicon dust particles of 0.01mm~0.1mm (first particles); Dv 90 Fine sand particles (second particles) of 0.1mm~4mm; Dv 90 Fine gravel particles of 4mm~10mm (third particles); Dv 90 Medium gravel particles (fourth particles) with a size of 10mm to 15mm; Dv 90 Crushed stone particles of 15mm~50mm (fifth particles); The mass ratio of the first particles, the second particles, the third particles, the fourth particles and the fifth particles is 3.9:18.6:38:35.7:3.8.

[0043] Comparative Example 1 Comparative Example 1 of the present application provides dust for testing the dustproof sealing performance of a vehicle dust hole, which does not contain particle 1 based on Test Example 2.

[0044] Comparative Example 2 Comparative Example 2 of the present application provides a dust for testing the dustproof sealing performance of a vehicle dust hole, which does not contain Particle 2 based on Test Example 2.

[0045] Comparative Example 3 Comparative Example 3 of the present application provides a dust for testing the dustproof sealing performance of a vehicle dust hole, which does not contain particle 3 based on Test Example 2.

[0046] Comparative Example 4: Comparative Example 4 of the present application provides a dust for testing the dustproof sealing performance of a vehicle dust hole, which does not contain particle 4 based on Test Example 2.

[0047] Comparative Example 5 Comparative Example 5 of the present application provides a dust for testing the dustproof sealing performance of a vehicle dust hole, which does not contain particle 5 based on Test Example 2.

[0048] Performance Testing The dustproof performance of the vehicle dust hole dustproof sealing test of Examples 1 to 5 and Comparative Examples 1 to 5 was tested with dust, and the test method was as follows: Test location: Inside the automobile test dust hole, there are vehicle-sensing lift doors at both ends of the dust hole, which will automatically close when the vehicle enters the entrance and leaves the exit.

[0049] Vehicle driving: A general passenger car was selected to drive at a constant speed of 40 km / h in the dust hole. The measurement began after the vehicle passed through the dust hole three times and the dust was completed.

[0050] Sensor arrangement: Use a dust concentration meter to set a test point every 40 meters in the dust hole, for a total of 4 points, and the point height is 1.5 meters above the ground; Data measurement: Measure the dust concentration at four points and calculate the average and range.

[0051] The results are shown in Table 1.

[0052] Table 1 Properties of dust used in the vehicle dust hole dust sealing test of Examples 1 to 5 and Comparative Examples 1 to 5

[0053] As can be seen from Table 1, the dust concentration in Examples 1 to 5 is relatively stable, the dust extremes at the four points are small, and the concentration fluctuation is within 8% of the average concentration. At the same time, the vehicle can pass smoothly at a stable speed without slipping.

[0054] Since Comparative Example 1 lacks the first particles, there are no effective dust particles, and the dust concentration is extremely low, which cannot meet the measurement requirements.

[0055] In Comparative Example 2, due to the lack of second particles, the main dust cannot be effectively encapsulated, the dust is too much, and the concentration is unstable. The range of different measuring points exceeds the average value by 20%, which cannot meet the measurement requirements.

[0056] In Comparative Example 3, due to the lack of the third particle, the main dust cannot be effectively wrapped, the dust is too much, and the concentration is unstable. The range of different measuring points exceeds the average value by 27%. Unconventional dust enters the vehicle, and there are too many fine particles, which makes the vehicle slip easily during driving, and cannot meet the measurement requirements.

[0057] In Comparative Example 4, due to the lack of the fourth particle, the main dust cannot be effectively wrapped, the dust is too much, and the concentration is unstable. The range of different measuring points exceeds the average value by 24%. Unconventional dust enters the vehicle, and there are too many fine particles, which makes the vehicle slip easily during driving, and cannot meet the measurement requirements.

[0058] In Comparative Example 5, due to the lack of the fifth particle, the main dust substances are difficult to control, the dust is excessive, and the concentration is unstable. The range of different measuring points exceeds the average value by 11%. The lack of large-particle gravel reduces the tire grip and makes the vehicle prone to slipping, which cannot meet the measurement requirements.

[0059] In summary, by using first particles, second particles, third particles, fourth particles and fifth particles with gradually increasing particle sizes, the actual road driving dust environment of the car can be simulated more realistically and stably, and the dust environment stability problem of the dust hole dust sealing test can be improved, making the horizontal comparison of the dust resistance performance of different vehicles or vehicles at different development stages more effective, and at the same time solving the adverse effects of unconventional dust intrusion and test safety in the original solution.

[0060] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments / methods or examples. In addition, those skilled in the art may combine and combine different embodiments / methods or examples described in this specification and the features of different embodiments / methods or examples, unless they are contradictory.

[0061] It should be noted that, in the present application, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or equipment comprising the elements. In the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly specified.

[0062] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A dust seal tester for a vehicle dust hole, characterized in that: The invention comprises first particles, second particles, third particles, fourth particles and fifth particles of different particle sizes, wherein: 0.01mm≤Dv of the first particle 90 <Dv of the second particle 90 <Dv of the third particle 90 <Dv of the fourth particle 90 <Dv of the fifth particle 90 ≤50mm.

2. The dust for testing the dustproof sealing performance of a vehicle dust hole according to claim 1, characterized in that: The Dv of the first particle 90 It is 0.01mm~0.1mm.

3. The dust for testing the dustproof sealing performance of a vehicle dust hole according to claim 1, characterized in that: The Dv of the second particle 90 0.1mm~4mm.

4. The dust for testing the dustproof sealing performance of a vehicle dust hole according to claim 1, wherein: The Dv of the third particle 90 4mm~10mm.

5. The dust for testing the dustproof sealing performance of a vehicle dust hole according to claim 1, characterized in that: The Dv of the fourth particle 90 It is 10mm~15mm.

6. The dust for testing the dustproof sealing performance of a vehicle dust hole according to claim 1, wherein: The Dv of the fifth particle 90 It is 15mm~50mm.

7. The dust for testing the dustproof sealing performance of a vehicle dust hole according to claim 1, wherein: The material of the first particles includes at least one of silicon dust and / or ceramic powder; and / or, The material of the second particles includes at least one of fine sand, medium sand and / or coarse sand; and / or, The material of the third particles includes fine gravel; and / or, The material of the fourth particles includes medium gravel; and / or, The material of the fifth particles includes coarse gravel or crushed stone.

8. The dust for testing the dustproof sealing performance of a vehicle dust hole according to claim 1, wherein: The mass ratio of the first particles, the second particles, the third particles, the fourth particles and the fifth particles is (2-5): (15-25): (35-40): (30-40): (2-5).

9. The dust for testing the dustproof sealing performance of a vehicle dust hole according to claim 8, wherein: The mass ratio of the first particle, the second particle, the third particle, the fourth particle and the fifth particle is (3.5-4.5): (18-20): (37-39): (34-36): (3.5-4.5).

10. A vehicle dust hole dustproof sealing test device, characterized in that: The dust for testing the dustproof sealing performance of a vehicle dust hole according to any one of claims 1 to 9 is included.

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