Dust filtration testing device for vehicle air filter

Abstract

The invention discloses a dust filtration testing device for a vehicle air filter, and relates to the technical field of dust filtration testing of air filters, and the dust filtration testing device specifically comprises an air blowing box and a dust locking box, the top of the air blowing box is provided with the dust locking box, and the top of the air blowing box and two sides of the dust locking box are provided with dust return boxes; a sliding placement frame is slidably connected to the side, communicating with the dust return box, of the air blowing box; the test dust in the dust filtration test of the vehicle air filter is recycled, the movable dust cleaning mechanism is arranged in the dust cleaning mechanism, through the synergistic effect of a worm, a sleeve disc set and a brush roller, an old plate is automatically brushed in multiple directions in the plate replacement stage, attached dust is thoroughly removed and recycled to a dust return box for recycling, and the dust cleaning efficiency is improved. According to the design, not only is the test cost reduced, but also the environmental protection property is improved through dust closed-loop management, so that the problems of dust waste and inconvenience in cleaning in the traditional test are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air filter dust filtration testing, and particularly to a vehicle air filter dust filtration testing device. Background Art

[0002] As the heart of a vehicle, the performance of the engine directly affects the operating state of the vehicle. During operation, the engine needs to inhale a large amount of air, and a large amount of dust and impurities are often suspended in this air. If this air is not filtered, the suspended dust will be inhaled into the cylinder, accelerating the wear of the piston group and the cylinder, and even causing serious cylinder scoring phenomena. Especially in dry and sandy working environments, this problem is more prominent. As a key component installed in front of the carburetor or intake pipe, the air filter plays a role in filtering dust and sand in the air, ensuring that sufficient and clean air enters the cylinder, thereby protecting the normal operation of the engine.

[0003] However, to verify the performance of the air filter and whether it can effectively filter dust in the air, it is necessary to use a professional testing device for verification. For example, in the patent " "A performance testing device and testing method for an air filter", by mixing fluorescein with the test dust, it is convenient for subsequent testing institutions to detect. However, during the overall testing process, the test dust is not collected, including the dust adsorbed on the measuring air filter plate, resulting in an increase in the loss of the entire test dust. Regarding the problem of feeding and installing the air filter plate during the detection process, using a conveyor belt to move and feed the air filter plate increases the standby time of the detection equipment, affecting the overall detection efficiency of the subsequent air filter plate.

[0004] Therefore, we propose a vehicle air filter dust filtration testing device. Summary of the Invention

[0005] The purpose of the present invention is to provide a vehicle air filter dust filtration testing device to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A vehicle air filter dust filtration testing device includes a blast box and a dust locking box. The dust locking box is installed on the top of the blast box. Return dust boxes are installed on both sides of the dust locking box at the top of the blast box. A sliding placement rack is slidably connected to the side where the blast box communicates with the return dust box, and sealing strips are adhesively fixed to both sides of the top of the sliding placement rack;

[0007] The bottom of the dust locking box is fixedly connected and communicated with a detection box. A collection plate is fixedly installed on the inner wall of the detection box. A monitor is installed at the bottom of the collection plate on the inner wall of the detection box. A sealing cover is fixedly connected to the side of the dust locking box and the dust return box. A driving box is symmetrically installed on the side of the dust return box within the sealing cover. A roller shaft is movably connected to the side of a single driving box. An arc-shaped stop block is fixedly installed on the cylinder column at the end of the roller shaft through bolts. An arc-shaped toothed rod is rotatably connected to the inner wall of the top of the sealing cover. The bottom protrusion of the arc-shaped toothed rod abuts against the arc-shaped stop block on the roller shaft. The arc-shaped toothed rod is meshed and connected with the single-side tooth pattern of the sliding placement rack.

[0008] Further, a toothed shaft is installed on the side of a single driving box. The side of the toothed shaft is movably abutted against the roller shaft. A friction tooth sleeve is slidably connected to the inner wall of the sealing cover. The gear on the friction tooth sleeve is meshed and connected with the toothed shaft. The other bottom protrusion of the arc-shaped toothed rod abuts against the friction tooth sleeve.

[0009] Further, a friction transmission shaft is movably connected to the sides of the two driving boxes. The friction block at the end of the friction transmission shaft is correspondingly arranged with the friction tooth sleeve. An active dust cleaning mechanism is installed in the driving box.

[0010] Further, the active dust cleaning mechanism includes a worm, a set of pulley discs and a sliding strip. The worm is movably connected to the inner wall of the driving box. The set of pulley discs is slidably connected to the inner wall of the driving box, and each pulley disc on the set of pulley discs is sleeved and connected by a synchronous belt. One end of the worm is slidably abutted against the middle pulley disc within the set of pulley discs. The sliding strip is slidably connected to the inner wall of the driving box. Claws are uniformly fixedly connected to the sliding strip, and the claws are clamped with the outer wall of the set of pulley discs. The end of the set of pulley discs penetrates through one side of the dust return box and a brush roller is installed.

[0011] Further, a turbine sleeve is movably connected to the inner wall of the driving box. The turbine on the turbine sleeve is meshed and connected with the worm. An eccentric wheel is fixed to the side of the turbine sleeve, and a sleeve rod is movably sleeved on the eccentric wheel. One end protrusion of the sleeve rod abuts against the notch on the sliding strip.

[0012] Further, a spray head assembly is installed on the inner wall of the detection box at the top of the collection plate. A drying assembly is installed in the detection box on the opposite side of the spray head assembly.

[0013] Further, a dust guide pipe is fixedly connected and communicated with the side of the air blower box. One end of the dust guide pipe is communicated with the dust locking box. A dust replacement plate is installed on one side of the air blower box.

[0014] The test method of this vehicle air filter dust filtration test device is as follows:

[0015] Plate placement and air blowing detection: Open the top cover of the single-sided dust return box. Place the air filter plate to be tested on the sliding placement rack. While closing the cover, control the rotation of the roller shaft on the drive box. When the arc-shaped stopper contacts the arc-shaped toothed rod, it drives the sliding placement rack to translate, moving the air filter plate to be tested into the dust locking box. Along with the operation of the air blowing box, the internal fan blows the test dust placed in advance on the dust changing plate, and through the dust guiding pipe, it reaches the top of the air filter plate. As the test dust continuously contacts the air filter plate, part of the test dust passes through the air filter plate and falls into the detection box. The detector installed in the detection box uses an infrared light source to irradiate the dust particles to obtain the concentration of suspended dust particles at the bottom of the collection plate.

[0016] Plate replacement and dust removal cleaning: Along with the replacement of the air filter plate to be tested, place the new air filter plate to be tested in the sliding placement rack. Along with the movement of the sliding placement rack, take out the old air filter plate from the dust return box, turn it 180°, and put it in again. While the new air filter plate is being tested, the brush roller in the dust return box rotates to clean the old air filter plate with test dust, and the cleaned test dust is recycled.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. In the present invention, through the design of a double-station sliding placement rack, combined with the linkage mechanism of the arc-shaped toothed rod and the roller shaft driven by machinery, seamless switching of the air filter plate to be tested is achieved. During the test, when a single station is performing dust filtration detection, the other station can synchronously complete the cleaning of the old plate and the loading of the new plate, significantly reducing the standby time of the equipment and improving the overall test efficiency. At the same time, the sealing strip of the sliding placement rack and the automatic translation mechanism ensure the airtightness and operation coherence of the test environment, improving the overall efficiency of the subsequent air filter dust filtration test.

[0019] 2. In the present invention, dust recycling and cleaning are integrated. The device is equipped with a movable dust cleaning mechanism. Through the coordinated action of the worm, the sleeve plate group, and the brush roller, the old plate is automatically brushed in multiple directions during the plate replacement stage, thoroughly removing the attached dust and recycling it to the dust return box for reuse, significantly reducing the loss of test dust. This design not only reduces the test cost but also improves environmental protection through closed-loop dust management to solve the pain points of dust waste and inconvenient cleaning in traditional tests. Brief Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of the vehicle air filter dust filtration test device of the present invention;

[0021] Figure 2 It is a schematic diagram of the vehicle air filter dust filtration test device of the present invention without the sealing cover;

[0022] Figure 3 Schematic diagram of the installation structure of the sliding placement rack in the dust return box and the dust locking box of the present invention;

[0023] Figure 4 Schematic diagram of the structure of the movable dust cleaning mechanism in the drive box of the present invention;

[0024] Figure 5 Schematic diagram of the connection between the belt pulley and the worm on the sleeve disc group of the present invention;

[0025] Figure 6 Schematic diagram of the installation structure of the detector in the detection box of the present invention.

[0026] In the figure: 1. Blower box; 2. Dust return box; 3. Dust locking box; 4. Sealing cover; 5. Detection box; 6. Dust guide pipe; 7. Sliding placement rack; 8. Drive box; 9. Tooth shaft; 10. Drum shaft; 11. Arc-shaped stop block; 12. Arc-shaped tooth rod; 13. Friction drive shaft; 14. Friction tooth sleeve; 15. Sealing strip; 16. Movable dust cleaning mechanism; 161. Worm; 162. Sleeve disc group; 163. Slide bar; 164. Claw; 165. Brush roller; 17. Turbine sleeve; 18. Sleeve rod; 19. Collection plate; 20. Detector; 21. Sprinkler assembly; 22. Drying assembly; 23. Dust replacement plate. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to Figure 1-6 , the present invention provides a technical solution:

[0029] Embodiment 1: As shown in Figure 1 and Figure 2 , a vehicle air filter dust filtration test device, the main body is modularly composed of a blower box 1, a dust return box 2, a dust locking box 3 and a detection box 5. Among them, the dust locking box 3 and the dust return box 2 are communicated, and a sliding placement rack 7 is installed. The sliding placement rack 7 is arranged in a double-station manner, and two air filter plates can be stored. By placing the air filter to be tested and switching the test area in the dust locking box 3, uninterrupted testing of the air filter plates can be realized, and the overall air filter test efficiency can be improved;

[0030] In order to realize the position switching of the air filter plate to be tested in the working area of the dust locking box 3, a set of sliding placement rack translation mechanism is designed, which is mainly composed of components such as a drive box 8, a drum shaft 10, an arc-shaped stop block 11 and an arc-shaped tooth rod 12;

[0031] When it is necessary to switch the position of the air filter plate to be tested, first open the top cover of the single-sided dust-returning box 2, place the air filter plate to be tested on the sliding placement rack 7, and close the cover. Then, control the rotation of the roller shaft 10 on the driving box 8. The rotation of the roller shaft 10 will drive the arc-shaped stopper 11 installed at its end to rotate together. When the arc-shaped stopper 11 contacts the arc-shaped tooth bar 12, it will push the arc-shaped tooth bar 12 to rotate. Since the arc-shaped tooth bar 12 is meshed and connected with the single-sided tooth pattern of the sliding placement rack 7, the rotation of the arc-shaped tooth bar 12 will drive the entire sliding placement rack 7 to translate;

[0032] In this way, the position switching of the air filter plate to be tested in the working area of the dust-locking box 3 can be realized, providing the possibility for uninterrupted testing. At the same time, since the sliding placement rack 7 is arranged in a double-station mode, the replacement and preparation of the plate can be carried out at one station while the test is being carried out at the other station, further improving the test efficiency;

[0033] When blowing dust on the surface of the air filter plate to be tested, the fan installed in the air-blowing box 1 rotates, blowing the test dust stored on the surface of the dust-changing plate 23 upward, guiding it through the dust guide pipe 6, and finally reaching the top of the dust-locking box 3. The falling air flow is mixed with the test dust, continuously impacting the air filter plate to be tested installed on the sliding placement rack 7. The sealing strip 15 installed on the sliding placement rack 7 is used to seal the sliding gap, and continuous impact causes a small amount of dust to pass through the air filter plate to be tested and come into the detection box 5;

[0034] As Figure 6 shown, the entire detection box 5 uses the light scattering method to measure the dust concentration falling in the detection box 5. The detector 20 installed at the bottom of the detection box 5 penetrates the collection plate 19, and the collection plate 19 is made of glass. The detector 20 sets 9 monitoring points in the detection box 5, develops a concentration gradient analysis algorithm based on LabVIEW, outputs the filtration efficiency curve, sets the detection duration, and clears the dust on the surface of the collection plate 19 after the detection is completed to facilitate subsequent detection;

[0035] The spray head assembly 21 installed on the inner wall of the detection box 5 sprays water to clean the collection plate 19, and at the same time, the drying assembly 22 dries the wet collection plate 19 after cleaning. Through the double-station setting of the air filter plate on the sliding placement rack 7 and the use of a mechanical drive method for station switching, uninterrupted testing is realized, greatly improving the test efficiency.

[0036] Embodiment 2: To avoid waste of test dust, after the test, the used air filter plate needs to be cleaned to remove the test dust for recycling. For this purpose, a set of cleaning mechanism for the air filter plate is designed, which mainly consists of components such as a movable dust cleaning mechanism 16, a friction transmission shaft 13, a friction gear sleeve 14, and a gear shaft 9;

[0037] As Figure 4 shown, the movable dust cleaning mechanism 16 includes components such as a worm 161, a set of pulley discs 162, a slide bar 163, and a claw 164. The pulley discs on the set of pulley discs 162 are sleeved through a synchronous belt to form an integral rotating structure. As Figure 5 shown, one end of the worm 161 is in sliding contact with the middle pulley disc inside the set of pulley discs 162. By rotating the worm 161, the whole set of pulley discs 162 can be driven to rotate. The slide bar 163 is evenly and fixedly connected with claws 164, and the claws 164 are clamped with the outer wall of the set of pulley discs 162. The end of the set of pulley discs 162 penetrates through one side of the dust return box 2 and is installed with a brush roller 165 for cleaning the air filter plate;

[0038] During the process of switching the position of the sliding placement rack 7, the arc-shaped toothed rod 12 will drive the friction gear sleeve 14 to move. When the friction gear sleeve 14 contacts the friction transmission shaft 13 on one side of the drive box 8, the two will fit together. At the same time, the gear shaft 9 on the other side of the drive box 8 will rotate, driving the whole friction gear sleeve 14 to rotate. Since the gear on the friction gear sleeve 14 is meshed with the gear shaft 9, the rotation of the gear shaft 9 will drive the friction gear sleeve 14 to rotate together;

[0039] The rotation of the friction gear sleeve 14 will drive the friction transmission shaft 13 in contact with it to rotate. The friction transmission shaft 13 is meshed with the gear at the end of the worm 161 inside the drive box through a gear, so the worm 161 will also rotate accordingly. The rotation of the worm 161 will drive the pulley disc in the middle of the set of pulley discs 162 to rotate, and then all pulley discs will rotate through the synchronous belt. At the same time, the rotation of the worm 161 will also drive the turbine sleeve 17 to rotate. The turbine on the turbine sleeve 17 is meshed with the worm 161, so the rotation of the turbine sleeve 17 will drive the eccentric wheel on it to rotate. The rotation of the eccentric wheel will realize the movement of the sleeve rod 18. One end of the sleeve rod 18 protrudes and abuts against the notch on the slide bar 163, so the movement of the sleeve rod 18 will drive the slide bar 163 to move back and forth inside the drive box;

[0040] The movement of the slide bar 163 will drive the claws 164 installed on it to move synchronously, thereby driving the set of pulley discs 162 to move back and forth. At the same time, since the rotation of the worm 161 will drive the whole set of pulley discs 162 to rotate, the set of pulley discs 162 can both move back and forth and rotate. Finally, the rotation and forward and backward sliding of the brush roller 165 connected inside the dust return box 2 by the set of pulley discs 162 are realized;

[0041] For the treatment of the old air filter plate, after placing the new air filter plate in the sliding placement rack 7, as the arc-shaped tooth bar 12 rotates, the replacement of the old and new air filter plates is completed. Since a large amount of test dust accumulates on the top of the air filter plate, the top cover of the dust return box 2 needs to be opened, and the old air filter plate is manually flipped 180°. At this time, the side with a larger dust content of the old air filter plate faces downward, and the brush roller 165 is used for cleaning;

[0042] During the cleaning process, the bristles of the brush roller 165 will be in close contact with the surface of the air filter plate, brushing off the test dust adhering to the surface of the plate. Compared with ordinary rolling brushing, the method of rolling plus horizontal swinging has a better cleaning effect. The brushed-off dust will be collected by the collection mechanism in the dust return box 2 and recycled for subsequent tests. By setting up the test cleaning component for the air filter plate, the test dust can be cleaned out and recycled, reducing the test cost.

[0043] The working principle of the present invention: In the plate placing and air blowing detection step, first, open the top cover of the single-sided dust return box 2, place the air filter plate to be tested on the sliding placement rack 7, and close the cover. Then, control the rotation of the roller shaft 10 on the drive box 8. Through the transmission of the arc-shaped stopper 11 and the arc-shaped tooth bar 12, the air filter plate to be tested is moved into the dust locking box 3. Next, start the fan inside the air blowing box 1 to blow the test dust placed in advance on the dust replacement plate 23, and transport the dust to the top of the air filter plate through the dust guide pipe 6. As the test dust continuously contacts the air filter plate, part of the dust will fall through the plate into the detection box 5. The detector 20 installed in the detection box 5 will use an infrared light source to irradiate the dust particles to obtain the concentration of the suspended dust particles on the top of the collection plate 19, so as to evaluate the filtration performance of the air filter;

[0044] In the plate replacement and dust removal cleaning step, when the test of one air filter plate is completed, it needs to be taken out and a new plate to be tested is placed. At this time, control the translation mechanism of the sliding placement rack 7 to move the old plate into the dust return box 2 for a 180° flip and then put it in again. At the same time, start the cleaning mechanism to clean the old plate. During the cleaning process, the brush roller 165 will rotate and slide back and forth, brushing off and collecting the test dust adhering to the surface of the plate. The cleaned test dust can be recycled for subsequent tests.

[0045] The above content is only an example and description of the structure of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods for substitution. As long as it does not deviate from the structure of the invention or exceed the scope defined by this claim book, it should fall within the protection scope of the present invention.

[0046] In the description of this specification, the descriptions referring to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0047] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to only the specific embodiments. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A dust filtration test device for a vehicle air filter, comprising a blower box (1) and a dust locking box (3), wherein the dust locking box (3) is installed on the top of the blower box (1), and is characterized in that, On the top of the blower box (1) and on both sides of the dust locking box (3), a dust return box (2) is installed. A sliding placement rack (7) is slidably connected to the communicating side between the blower box (1) and the dust return box (2). And sealing strips (15) are adhesively fixed to both sides of the top of the sliding placement rack (7). At the bottom of the dust locking box (3), a detection box (5) is fixedly connected in communication. A collection plate (19) is fixed to the inner wall of the detection box (5). A monitor is installed at the bottom of the inner wall of the detection box (5) and below the collection plate (19). A sealing cover (4) is fixedly connected to the side between the dust locking box (3) and the dust return box (2). Inside the sealing cover (4) and on the side of the dust return box (2), drive boxes (8) are symmetrically installed. A drum shaft (10) is movably connected to the side of a single drive box (8). An arc-shaped stopper (11) is fixed to the cylinder column at the end of the drum shaft (10) by bolts. An arc-shaped toothed rod (12) is rotatably connected to the inner top wall of the sealing cover (4). The bottom protrusion of the arc-shaped toothed rod (12) abuts against the arc-shaped stopper (11) on the drum shaft (10). The arc-shaped toothed rod (12) is meshed and connected with the single-side tooth pattern of the sliding placement rack (7).

2. The dust filtration test device for vehicle air filters according to claim 1, wherein A toothed shaft (9) is installed on the side of a single drive box (8). The side of the toothed shaft (9) is movably abutted against the drum shaft (10). A friction tooth sleeve (14) is slidably connected to the inner wall of the sealing cover (4). The gear on the friction tooth sleeve (14) is meshed and connected with the toothed shaft (9). The other bottom protrusion of the arc-shaped toothed rod (12) abuts against the friction tooth sleeve (14).

3. A dust filtration test device for a vehicle air filter according to claim 2, characterized in that, Friction drive shafts (13) are movably connected to the sides of the two drive boxes (8). The friction blocks at the ends of the friction drive shafts (13) are arranged corresponding to the friction tooth sleeves (14). An active dust cleaning mechanism (16) is installed inside the drive box (8).

4. The vehicle air filter dust filtration test device according to claim 3, wherein, The active dust cleaning mechanism (16) includes a worm (161), a set of pulley disks (162), and a slide bar (163). The worm (161) is movably connected to the inner wall of the drive box (8). The set of pulley disks (162) is slidably connected to the inner wall of the drive box (8). And the belt pulleys on the set of pulley disks (162) are sleeved with synchronous belts. One end of the worm (161) is slidably abutted against the middle belt pulley inside the set of pulley disks (162). The slide bar (163) is slidably connected to the inner wall of the drive box (8). Claws (164) are uniformly fixedly connected to the slide bar (163). And the claws (164) are clamped with the outer wall of the set of pulley disks (162). The end of the set of pulley disks (162) penetrates through one side of the dust return box (2) and a brush roller (165) is installed.

5. The dust filtration test device for vehicle air filter according to claim 4, wherein, A turbine sleeve (17) is movably connected to the inner wall of the drive box (8). The turbine on the turbine sleeve (17) is meshed and connected with the worm (161). An eccentric wheel is fixed to the side of the turbine sleeve (17). And a sleeve rod (18) is movably sleeved on the eccentric wheel. One end protrusion of the sleeve rod (18) abuts against the notch on the slide bar (163).

6. The dust filtration test device for vehicle air filters according to claim 1, characterized in that, A spray head assembly (21) is installed on the inner wall of the detection box (5) and above the collection plate (19). A drying assembly (22) is installed inside the detection box (5) and on the opposite side of the spray head assembly (21).

7. The vehicle air filter dust filtration test device according to claim 6, characterized in that, A dust guide pipe (6) is fixedly connected to the side of the air blower box (1), one end of the dust guide pipe (6) is connected to a dust locking box (3), and a dust changing plate (23) is installed on one side of the air blower box (1).

8. A vehicle air filter dust filtration test device according to any one of claims 1-7, characterized in that, The test method of the vehicle air filter dust filtration test device is as follows: Plate placing and air blowing detection: Open the top cover of the single-side dust return box (2), place the air filter plate to be tested on the sliding placement rack (7), and while closing the cover, control the rotation of the roller shaft (10) on the driving box (8). When the arc-shaped block (11) contacts the arc-shaped tooth rod (12), it drives the sliding placement rack (7) to translate, moving the air filter plate to be tested into the dust locking box (3). Along with the operation of the air blower box (1), the internal fan blows the test dust placed in advance on the dust changing plate (23), and through the dust guide pipe (6), it reaches the top of the air filter plate. As the test dust continuously contacts the air filter plate, part of the test dust passes through the air filter plate and falls into the detection box (5). The detector (20) installed in the detection box (5) uses an infrared light source to irradiate the dust particles to obtain the concentration of the suspended dust particles at the bottom of the collection plate (19); Plate changing and dust removal cleaning: Along with the replacement of the air filter plate to be tested, place the new air filter plate to be tested into the sliding placement rack (7). Along with the movement of the sliding placement rack (7), take out the old air filter plate from the dust return box (2), turn it 180°, and put it back again. While the new air filter plate is being tested, the brush roller (165) in the dust return box (2) rotates to clean the old air filter plate with test dust, and the cleaned test dust is recycled.

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