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WO2017061383A1 - Procédé d'inspection de filtre en nid d'abeilles, appareil permettant d'inspecter un filtre en nid d'abeilles, et procédé de fabrication de filtre en nid d'abeilles - Google Patents

Procédé d'inspection de filtre en nid d'abeilles, appareil permettant d'inspecter un filtre en nid d'abeilles, et procédé de fabrication de filtre en nid d'abeilles Download PDF

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Publication number
WO2017061383A1
WO2017061383A1 PCT/JP2016/079317 JP2016079317W WO2017061383A1 WO 2017061383 A1 WO2017061383 A1 WO 2017061383A1 JP 2016079317 W JP2016079317 W JP 2016079317W WO 2017061383 A1 WO2017061383 A1 WO 2017061383A1
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WIPO (PCT)
Prior art keywords
honeycomb filter
end surface
particles
mist
images
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2016/079317
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English (en)
Japanese (ja)
Inventor
高橋　義則
鈴木　孝志
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Sumitomo Chemical Co Ltd
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Sumitomo Chemical Co Ltd
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Filing date
Publication date
Application filed by Sumitomo Chemical Co Ltd filed Critical Sumitomo Chemical Co Ltd
Priority to JP2017544489A priority Critical patent/JPWO2017061383A1/ja
Publication of WO2017061383A1 publication Critical patent/WO2017061383A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42—Auxiliary equipment or operation thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined

Definitions

  • the present invention relates to a honeycomb filter inspection method and the like.
  • Patent Document 1 discloses that a gas flow containing particles is supplied to an inlet end face of a honeycomb filter and the outlet end face is observed while irradiating a laser on the gas flow exiting from the outlet end face of the honeycomb filter. . If there is a defective portion in the honeycomb filter, particles leak from the defective portion, and the leaked particles scatter laser light, so that the presence and position of the defective portion can be confirmed from the outside.
  • the inspection accuracy is not sufficient, and a honeycomb filter having no defective portion is sometimes determined to be defective.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a method for inspecting a defect of a honeycomb filter that can further improve inspection accuracy.
  • the honeycomb filter defect inspection method Supplying a gas containing particles to one end face of the honeycomb filter; An image obtained by acquiring images including the other end face of the honeycomb filter a plurality of times at different times under the condition that the gas discharged from the other end face of the honeycomb filter is irradiated with the first laser sheet that spreads along the other end face. Acquisition process; Detecting whether or not regions having different brightness from the surroundings are present at the same position on the other end surface in at least two of the images at which the time when the images are acquired are separated from each other by 50 ms or more.
  • the particles scatter the laser beam due to the presence, foreign particles floating outside the honeycomb filter may occasionally reach the other end surface, or the foreign particles that originally existed in the honeycomb filter may happen due to gas flow. In some cases, the laser beam is scattered by separating from the filter and reaching the other end surface.
  • the present invention it is detected whether at least two images whose images are acquired are separated from each other by 50 ms or more in the same position on the other end surface whether or not there is a region that is lighter and darker than the surroundings.
  • the foreign particles floating outside the honeycomb filter and foreign particles originally present in the honeycomb filter happen to reach the other end surface and the laser is scattered, the foreign particles that have reached normally have a different time of 50 ms. Since it moves to a place, there is almost no possibility of observing a region with a different brightness than the surroundings at the same position of the image after 50 ms or more.
  • the supplying step includes a step of generating particles, and a step of guiding the generated particles together with a gas to one end face of the honeycomb filter by a pipe
  • the pipe is connected to the downstream side of the throttle part having the smallest inner diameter, connected to the downstream side of the throttle part and having a larger inner diameter than the throttle part, and connected to the upstream side of the throttle part and connected to the upstream side of the throttle part. Also has an upstream part with a large inner diameter, When the length of the downstream channel is L and the inner diameter of the throttle is D, L / D ⁇ 3 can be satisfied.
  • the gas containing the particles is passed through the throttle portion having the inner diameter D and then passed through the downstream portion having a length of 3D or more and then supplied to the filter, the generated particles are distributed in the radial direction of the pipe.
  • the uniformity of the mist concentration that is well dispersed and supplied to the honeycomb filter in the cross-sectional direction of the filter is increased, and the accuracy is further improved.
  • the particles may be mist.
  • a mixture of mist generated by ultrasonic waves and mist generated by a two-fluid nozzle can be supplied to one end face of the honeycomb filter.
  • the mist having a relatively small particle diameter generated by the ultrasonic wave and the mist having a relatively large particle diameter generated by the two-fluid nozzle are mixed, the scattered light of the mist leaking from the defective portion.
  • the inspection accuracy can be further improved.
  • the color of the other end face of the honeycomb filter may be black or a color having a complementary color relationship with the color of the laser beam.
  • a defect inspection apparatus for a honeycomb filter A supply unit for supplying a gas containing particles to one end face of the honeycomb filter; A light source that irradiates a first laser sheet that spreads along the other end surface toward the gas discharged from the other end surface of the honeycomb filter; A camera that acquires images including the other end face of the honeycomb filter a plurality of times at different times; A detection unit configured to detect whether or not regions having different brightness from the surroundings are present at the same position on the other end surface in at least two of the images that are separated from each other by 50 ms or more when the images are acquired.
  • the supply unit has a particle generating unit that generates the particles, and a pipe that guides the generated particles together with gas to one end surface of the honeycomb filter,
  • the pipe is connected to the downstream side of the throttle part having the smallest inner diameter, connected to the downstream side of the throttle part and having a larger inner diameter than the throttle part, and connected to the upstream side of the throttle part and connected to the upstream side of the throttle part. Also has an upstream part with a large inner diameter, When the length of the downstream channel is L and the inner diameter of the throttle is D, L / D ⁇ 3 can be satisfied.
  • the particles can be mist.
  • the supply unit may include an ultrasonic mist generator and a two-fluid nozzle.
  • a method for manufacturing a honeycomb filter according to the present invention includes a detection step of detecting defects in the honeycomb filter by the above-described method, And a sorting step of sorting out the honeycomb filter in which no defect is detected in the detection step.
  • a method for inspecting a defect of a honeycomb filter that can further improve inspection accuracy.
  • FIG. 1A is a perspective view of a honeycomb filter 100 to be inspected
  • FIG. 1B is a view taken along the arrow Ib-Ib in FIG.
  • FIG. 2 is a schematic cross-sectional view of a defect inspection apparatus 400 for the honeycomb filter 100.
  • FIG. 3 is an example of an image acquired by a camera
  • (a) is a schematic diagram of images at times t1, t2, t3, and t4 when there is a defective portion
  • (b) is a floating / filter outside the filter. It is the model of the image in time t1, t2, t3, t4 when the foreign particle which existed accidentally arrived on the other end surface.
  • the honeycomb filter 100 to be inspected in the present embodiment will be described.
  • the honeycomb filter 100 can be used as, for example, a diesel particulate filter.
  • the target honeycomb filter 100 in the present embodiment includes partition walls 112 that form a plurality of flow paths 110 that extend in parallel to each other, and a plurality of flow paths 110.
  • the length of the honeycomb filter 100 in the direction in which the flow path 110 extends is not particularly limited, but may be, for example, 40 to 350 mm. Further, the outer diameter of the honeycomb filter 100 is not particularly limited, but may be, for example, 100 to 320 mm.
  • the size of the cross section of the channel 110 can be set to 0.8 to 2.5 mm on a side in the case of a square, for example.
  • the thickness of the partition 112 can be 0.05 to 0.5 mm.
  • the material of the partition 112 of the honeycomb filter 100 is porous ceramics (fired body).
  • the ceramic is not particularly limited, and examples thereof include alumina, silica, mullite, cordierite, glass, oxides such as aluminum titanate, silicon carbide, silicon nitride, and metal.
  • the aluminum titanate can further contain magnesium and / or silicon.
  • the left end of a part of the plurality of channels 110 of the honeycomb filter 100 is sealed by the sealing part 114, and the right end of the remaining part of the plurality of channels 110 of the honeycomb filter 100 is sealed by the sealing part 114.
  • the same ceramics as the honeycomb filter 100 can be used.
  • the “part of the plurality of flow paths 110” and the “remaining part of the plurality of flow paths 110” described above are preferably arranged in a matrix when viewed from the end face side as shown in FIG. Of the plurality of flow paths arranged in the vertical direction and the horizontal direction in the horizontal direction.
  • the partition 112 of the honeycomb filter 100 is porous. As shown in FIG. 1B, the gas supplied from the left end of the flow path 110 passes through the partition 112 and reaches the adjacent flow path 110. It is discharged from the right end of the flow path 110. At this time, the honeycomb filter 100 functions as a filter by removing particles in the flowing gas by the partition 112.
  • Such a honeycomb filter 100 can be manufactured as follows, for example. First, an inorganic compound source powder, an organic binder, a solvent, and additives to be added as necessary are prepared. And these are mixed with a kneader etc. to prepare a raw material mixture, this raw material mixture is extruded from an extruder having an outlet opening corresponding to the shape of the partition wall (extrusion process), cut into a desired length, and then known A green honeycomb molded body is obtained by drying by the method. The end of the channel of the green honeycomb molded body is sealed with a sealing material by a known method (sealing step), and then the green honeycomb molded body is fired to obtain the honeycomb filter 100 (firing step). Alternatively, the green honeycomb molded body may be fired first, and then the end of the flow path may be sealed by a known method to obtain the honeycomb filter 100.
  • the inspection apparatus 400 includes a particle supply unit 150 that supplies a gas containing mist (particles) to one end face of the honeycomb filter, and a particle visualization unit 200.
  • the particle supply unit 150 includes a two-fluid nozzle 20 serving as a main particle generating unit, a pipe 50 that guides mist generated by the two-fluid nozzle 20 to the lower surface (one end surface) 100b of the honeycomb filter 100, and a superfluid serving as a sub-particle generating unit.
  • a sonic mist generator 60 is provided.
  • the two-fluid nozzle 20 receives the liquid supplied from the liquid source 10 via the line L1, and receives a gas supplied from the gas source 14, for example, air via the line L2, and generates a gas containing mist. .
  • the form of the two-fluid nozzle is not particularly limited. Further, the diameter of the mist is not particularly limited, but can be, for example, about 5 to 15 ⁇ m.
  • the liquid is preferably a volatile liquid in view of ease of removal after inspection, and water is particularly preferable.
  • the pipe 50 guides the gas containing the mist generated by the two-fluid nozzle (particle generation unit) 20 to the lower surface 100b of the honeycomb filter 100.
  • the pipe 50 is connected to the downstream side of the throttle part 50b having the smallest inner diameter, the downstream part 50c having a larger inner diameter than the throttle part 50b, connected to the upstream side of the throttle part 50b, and connected to the upstream side of the throttle part 50b.
  • the two-fluid nozzle 20 generates a gas containing mist in the upstream portion 50a.
  • the most upstream portion side of the upstream portion 50a has a cylindrical shape in which a plurality of two-fluid nozzles 20 are accommodated, and a portion that is downstream of the upstream portion 50a and connected to the throttle portion 50b is in the flow direction. It has a tapered shape in which the cross-sectional area is reduced along.
  • the downstream part 50c has a taper shape whose cross-sectional area expands along the flow direction.
  • the holding part 50d has a cylindrical shape and accommodates the lower end part of the honeycomb filter.
  • a sealing material 80 is disposed in the gap between the side surface of the honeycomb filter 100 and the inner surface of the holding portion 50d, thereby preventing leakage of gas containing particles.
  • An example of the sealing material 80 is a hollow rubber tube, and can be switched between a sealed state and a non-sealed state by taking air into and out of the tube.
  • L / D when the length of the flow path of the downstream portion 50c, that is, the length from the throttle portion 50b to the lower surface (one end surface) 100b of the honeycomb filter is L and the inner diameter of the throttle portion 50b is D, L / D can be 3 or more. Preferably, L / D is 4 or more, more preferably 5 or more.
  • the length L of the flow path when the downstream part 50c is not a straight pipe but a curved pipe, can be defined as the length of an axis formed by a set of cross-sectional centers (centers of gravity) of the pipes.
  • the generated mist is preferably dispersed in the radial direction of the pipe 50, and the mist can be supplied to each flow path of the honeycomb filter with high uniformity. is there.
  • L / D is usually 9 or less.
  • the inner diameter of the throttle portion 50b can be set to 5 to 10 cm, for example.
  • the length L of the flow path in the downstream portion 50c is not particularly limited, and can be, for example, 15 to 30 cm.
  • the ultrasonic mist generator 60 has a water tank 61, an ultrasonic vibrator 62 provided in the water tank 61, and a line 64 for supplying the generated mist to the downstream portion 50c.
  • Gas is supplied from the gas source 24 such as air through the line L3 into the water tank 61, and the mist generated by the ultrasonic vibrator 62 is mixed with the mist generated by the two-fluid nozzle 20 through the line 64. Is done.
  • the diameter of the mist is not particularly limited, but can be about 1 to 5 ⁇ m, for example.
  • mist derived from a two-fluid nozzle and a mist derived from an ultrasonic vibrator are mixed, a mist having a relatively small particle diameter derived from an ultrasonic vibrator, and a mist having a relatively large particle diameter derived from a two-fluid nozzle Since mist is mixed, the scattered light of the mist leaking from the defect portion can be increased, and the inspection accuracy is further improved.
  • the flow rate of the gas supplied to the honeycomb filter 100 is not particularly limited, but may be, for example, 50 to 500 L / min.
  • the mist concentration in the gas supplied to the honeycomb filter 100 can be 0.0001 to 0.1 g / L.
  • the gas of the gas sources 14 and 24 is not particularly limited, but air is preferable from the viewpoint of economy.
  • the gases of the gas sources 14 and 24 may be the same as each other or different from each other.
  • the gas temperature of the gas sources 14 and 24 is preferably 0 to 50 ° C., and more preferably 0 to 30 ° C.
  • the particle visualization unit 200 includes a light source 210 that irradiates a laser sheet (laser light) LS toward the gas discharged from the upper surface (other end surface) 100t of the honeycomb filter 100, and an upper surface (other end surface) 100t of the honeycomb filter 100.
  • the camera 220 which acquires the image of a visual field, and the computer (determination part) 230 which analyzes the image acquired by the camera 220 are provided.
  • the laser sheet LS from the light source 210 is irradiated in a direction parallel to the XY plane, which is a direction perpendicular to the Z direction in which the plurality of flow paths 110 of the honeycomb filter 100 extend, as shown in FIG.
  • the XY plane is a plane parallel to the upper surface (other end surface) 100t of the honeycomb filter 100, and the laser sheet LS extends along the upper surface 100t.
  • the distance between the laser sheet LS and the upper surface 100t can be set to 3 to 20 mm, for example.
  • the color of the laser is not particularly limited. For example, a red laser having a wavelength range of 630 to 690 nm can be used.
  • the camera 220 acquires an image of a visual field including the upper surface 100t of the honeycomb filter 100 from a direction (Z direction) perpendicular to the laser sheet LS.
  • the camera 220 acquires an image with the same field of view every predetermined time.
  • the number of images to be acquired may be two or more. For example, 5 to 10 images can be acquired.
  • the time interval for acquiring images is preferably 50 ms or more, but may be less than 50 ms. A suitable time interval is 75 to 500 ms.
  • the time at which the image was acquired (shooting time) is attached to the image data.
  • the exposure start time can be the time when the image is acquired.
  • the computer 230 performs image analysis on the image acquired by the camera 220, and detects areas of different brightness on the upper surface 100t as compared with the surrounding area. Specifically, for example, a bright portion or a dark portion may be extracted from each image compared to a predetermined threshold value.
  • the computer 230 selects at least two images whose images are acquired at a time of 50 ms or more apart from each other, and is lighter and darker than the surroundings at the same position on the upper surface 100t between the selected two or more images. Detect whether there is a different area.
  • the time at which images are acquired between at least two selected images may be 50 ms or more away from each other, and the time at which images are acquired may be any distance from each other.
  • the difference in time at which the images of at least two or more selected images are acquired can be 100 ms or more, and can be 300 ms or more. Also, this difference can be 1000 ms or less.
  • the camera acquires a plurality of images at an interval ⁇ T of 50 ms or more, if at least two images are arbitrarily selected from the obtained image group, the times when the images are acquired are separated from each other by 50 ms or more. Become.
  • the plurality of images may be selected so that the times when the images are acquired from the obtained image group are separated from each other by 50 ms or more. Then, it is only necessary to determine whether or not there is a region with different brightness in the same place between the selected images.
  • the number of images to be selected may be at least two, but is preferably three or more, may be ten or less, and is more preferably four to eight.
  • the determination result can be appropriately output to the outside as a signal or displayed on a screen of a display device or the like.
  • the partition wall 112 of the honeycomb filter 100 has, as a defect, a hole h that allows communication between the channel 110x with the upper surface sealed and the channel 110y with the lower surface sealed. It shall be.
  • the honeycomb filter 100 is fixed to the holding portion 50d of the pipe 50 through the sealing material 80. Then, a liquid is supplied from the liquid source 10 and a gas is supplied from the gas source 14 to the two-fluid nozzle 20, a gas containing mist is generated and supplied to the upstream portion 50 a of the pipe 50.
  • the generated gas containing mist is supplied into the honeycomb filter 100 from the lower surface 100b of the honeycomb filter 100 through the upstream portion 50a, the throttle portion 50b, and the downstream portion 50c (supplying step). Particles in the supplied gas are filtered by the partition walls 112 of the honeycomb filter, and the gas passing through the partition walls 112 flows out from the upper surfaces 100t of the plurality of flow paths 110 of the honeycomb filter 100.
  • the sealing part 114 is missing or when there is a defect such as a gap between the sealing part 114 and the flow path 110, the mixed gas containing mist flows out in a concentrated manner. Therefore, above such a flow path 110y, the concentration of mist is relatively higher than in other portions.
  • the laser sheet LS is irradiated from the light source 210, and a plurality of images including the upper surface 100t of the honeycomb filter 100 are acquired at different times under the irradiation state (image acquisition process).
  • the laser sheet LS irradiated from the light source 210 scatters when passing through a high-density portion, and is relative to the image acquired by the camera 220. Appears as a bright area A (see FIG. 3A).
  • FIG. 3A is a schematic diagram of images acquired at times t1 to t4 separated from each other by 50 ms or more. In all the images, a relatively bright region A at the same position on the upper surface 100t of the honeycomb filter 100 is shown. Exists. Therefore, it can be determined that there is a defect at the position corresponding to A and relatively many particles are leaking.
  • FIG. 3A is a schematic diagram of images acquired at times t1 to t4 separated from each other by 50 ms or more. In all the images, a relatively bright region A at the same position on the upper surface 100t of the honeycomb filter 100 is shown. Exists. Therefore, it can be determined that there is a defect at the position corresponding to A and relatively many particles are leaking.
  • FIG. 3A is a schematic diagram of images acquired at times t1 to t4 separated from each other by 50 ms or more. In all the images, a relatively bright region A at the same position on the upper surface 100t of the honeycomb filter 100 is shown. Exist
  • the image at time t1 has a bright area A near the lower left, but the corresponding bright area at the same position from time t2 to time t4. There is no.
  • the image at time t3 has a bright area B near the right side, but there is no corresponding bright area at the same position at time t1, time t3, and t4. Therefore, the bright areas A and B are light particles in which the floating foreign particles or foreign particles originally present in the filter are incidentally scattered laser light, and it can be determined that the filter itself has no defect.
  • the present embodiment it is detected whether or not a region brighter than the surroundings exists at the same position on the other end surface in two images whose images are acquired at 50 ms or more apart from each other.
  • the foreign particles that float outside the honeycomb filter or foreign particles that originally existed in the filter happen to reach the other end surface and the laser is scattered, the foreign particles that have reached normally move to another location after a 50 ms interval. Therefore, there is almost no possibility that a brighter area than the surrounding area is observed at the same position of the image after 50 ms or more.
  • more particles are leaking from the defective part of the filter, more particles are often present at the same position even after 50 ms or more, and around the same position of the image after 50 ms or more.
  • floating foreign particles or filters are detected by detecting whether or not there is a region where the contrast is different from the surroundings at the same position on the other end surface in at least two images whose images are acquired at a time of 50 ms or more apart from each other.
  • the presence or absence and position of the defective part of the filter can be detected with high accuracy by suppressing erroneous detection due to foreign particles originally present in the filter.
  • the gas containing the mist generated by the two-fluid nozzle passes through the throttle portion 50b having the inner diameter D and then passes through the downstream portion 50c having a length of 3D or more and then is supplied to the filter, the generated particles are It is well dispersed in the radial direction of the pipe, and the uniformity of the concentration of mist supplied to the honeycomb filter in the filter cross-sectional direction is increased, and the accuracy is further improved.
  • the mist by the ultrasonic wave is generated from the ultrasonic mist generator 60 and mixed with the mist generated from the two-fluid nozzle at the downstream portion 50c, the mist having a relatively small particle diameter by the ultrasonic wave and the two-fluid Mist with a relatively large particle diameter by the nozzle is suitably mixed, and there is an effect that the mist becomes easier to scatter the laser when there is leakage.
  • the color of the upper surface (the other end surface) 100t of the honeycomb filter can be black or a color having a complementary color relationship with the color of the laser beam.
  • the contrast between the region A in the image and the upper surface 100t that is the background is improved, and the accuracy is further improved.
  • the end face of the filter can be colored with a dye or a paint.
  • An example of a complementary color when the laser is red is blue-green.
  • the inspection method according to this embodiment may be incorporated in the manufacturing process of the honeycomb filter 100. That is, the manufacturing method of the honeycomb filter 100 includes, in addition to the above-described extrusion process, sealing process, and firing process, a detection process for detecting defects in the honeycomb filter by the inspection method according to the present embodiment, and defects in the detection process. You may provide the sorting process which sorts the honeycomb filter which is not detected. By performing the sorting step, a honeycomb filter in which no defect is detected can be sent to the next step or can be made into a final product.
  • the pipe 50 satisfying the above condition L / D ⁇ 3 is adopted, but the present invention can also be implemented using a straight pipe that does not satisfy the above condition, for example, a constant inner diameter.
  • the ultrasonic mist generator 60 is connected to the downstream portion 50c via the line 64, but may be connected to the throttle portion 50b or may be connected to the upstream portion 50a.
  • the two-fluid nozzle 20 may be removed from the bottom of the pipe 50 and, instead, the ultrasonic mist generator 60 may be installed at that position.
  • the mist generated by the two-fluid nozzle 20 is supplied to the filter.
  • the mist generated by another method may be supplied to the filter.
  • Particles may be used.
  • mist may be generated by mixing water and dry ice, or a mist of glycol alcohol (for example, propylene glycol) may be used.
  • solid particles such as carbon black can be used as the particles other than the liquid.
  • the mist generated by the ultrasonic mist is added to the mist generated by the two-fluid nozzle, but the present invention can be implemented without adding it.
  • the direction of the laser sheet and the direction of the camera are not limited to the above embodiments.
  • the atmospheric gas is air, but it goes without saying that other gases may be used as the atmospheric gas.
  • the flow path 110 of the honeycomb filter 100 is arranged in the vertical direction, but the present invention can be implemented in any direction such as a horizontal direction.
  • the cross-sectional shape of the flow path 110 is substantially square, but is not limited thereto, and may be rectangular, circular, elliptical, triangular, hexagonal, octagonal, or the like. Moreover, in the flow path 110, those with different diameters and those with different cross-sectional shapes may be mixed.
  • the arrangement of the channels is a square arrangement in FIG. 1, the arrangement is not limited to this, and the equilateral triangle arrangement in which the central axis of the channel is arranged at the apex of the equilateral triangle in the cross section, In the case of a square, a staggered arrangement can be used.
  • the outer shape of the honeycomb filter is not limited to a cylindrical shape, and may be, for example, an elliptical column, a triangular column, a quadrangular column, a hexagonal column, an octagonal column, or the like.
  • the shape of the sealing portion 114 is not a plug-shaped sealing portion, but the cross-sectional area of each inlet channel / outlet channel decreases from the axial center to the end surface, and each outlet channel / inlet flow The cross-sectional area of the road may be enlarged.
  • the honeycomb filter is a fired body having a porous partition wall, but it can be implemented even before firing and in a non-porous green body. In this case, there is no outflow of gas from the channel without defects.
  • the computer determines whether or not there is a region that is different in brightness and darkness from the surroundings at the same position on the other end surface. The presence / absence and position of regions with different brightness may be determined.
  • SYMBOLS 20 Two-fluid nozzle (particle generation part), 50 ... Pipe, 50a ... Upstream part, Restriction part ... 50b, 50c ... Downstream part, 60 ... Ultrasonic mist generator, 100 ... Honeycomb filter, 100t ... Top surface of honeycomb filter ( Other end surface), 100b ... Lower surface (one end surface) of the honeycomb filter, 150 ... Particle supply unit, 200 ... Particle visualization unit, 210 ... Light source, 230 ... Computer (determination unit), LS ... Laser sheet (laser light).

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  • Processes For Solid Components From Exhaust (AREA)

Abstract

L'invention concerne un procédé d'inspection de défauts d'un filtre en nid d'abeilles comprenant : une étape d'introduction consistant à introduire un gaz contenant des particules à une surface d'extrémité du filtre en nid d'abeilles ; une étape d'acquisition d'images consistant à acquérir plusieurs fois une image contenant l'autre surface d'extrémité du filtre en nid d'abeilles à différents instants, dans un état dans lequel un gaz expulsé par l'autre surface d'extrémité du filtre en nid d'abeilles est exposé à un pinceau laser plat, qui est étalé le long de l'autre surface d'extrémité ; et une étape consistant à détecter s'il existe ou non, parmi au moins deux des images acquises à des instants distants de 50 ms ou plus, une région située à la même position de l'autre surface d'extrémité et ayant une luminosité différente de celle de son environnement.
PCT/JP2016/079317 2015-10-09 2016-10-03 Procédé d'inspection de filtre en nid d'abeilles, appareil permettant d'inspecter un filtre en nid d'abeilles, et procédé de fabrication de filtre en nid d'abeilles Ceased WO2017061383A1 (fr)

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
DE102021001112A1 (de) 2020-03-31 2021-09-30 Ngk Insulators, Ltd. Prüfverfahren für säulenförmigen Wabenfilter
JP2022151195A (ja) * 2021-03-26 2022-10-07 日本碍子株式会社 柱状ハニカム構造体の検査装置及び検査方法
US12111230B2 (en) 2019-03-14 2024-10-08 Corning Incorporated Thermal gas inspection of plugged honeycomb body

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JP2009503508A (ja) * 2005-07-29 2009-01-29 コーニング インコーポレイテッド 粒子状流体を用いてハニカム体の欠陥を検出する方法、システム及び装置
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12111230B2 (en) 2019-03-14 2024-10-08 Corning Incorporated Thermal gas inspection of plugged honeycomb body
DE102021001112A1 (de) 2020-03-31 2021-09-30 Ngk Insulators, Ltd. Prüfverfahren für säulenförmigen Wabenfilter
CN113464254A (zh) * 2020-03-31 2021-10-01 日本碍子株式会社 柱状蜂窝过滤器的检查方法
JP2021162488A (ja) * 2020-03-31 2021-10-11 日本碍子株式会社 柱状ハニカムフィルタの検査方法
CN113464254B (zh) * 2020-03-31 2023-03-24 日本碍子株式会社 柱状蜂窝过滤器的检查方法
US11662293B2 (en) 2020-03-31 2023-05-30 Ngk Insulators, Ltd. Inspection method for pillar-shaped honeycomb filter
JP2022151195A (ja) * 2021-03-26 2022-10-07 日本碍子株式会社 柱状ハニカム構造体の検査装置及び検査方法
JP7372952B2 (ja) 2021-03-26 2023-11-01 日本碍子株式会社 柱状ハニカム構造体の検査装置及び検査方法

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