JP5555551B2 - Grinding apparatus and grinding method - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a grinding apparatus and a grinding method, and in particular, peeling and removal of a layer formed by coating or the like on a lattice-shaped inner wall of a ceramic molded body having a honeycomb structure, removal of foreign matters attached to the inner wall, or alteration of an inner wall. The present invention relates to an apparatus for grinding a layer and a grinding method using the apparatus.

  In recent years, in order to realize a resource recycling society and an energy saving society, businesses for collecting and reusing used products are being actively performed. However, among used products, there are products that cannot be reused (or are very difficult to reuse) even if they are collected due to the structure of the product. Such products are used as, for example, ceramic honeycomb waste catalysts for automotive converters, ceramic molded bodies having a ceramic honeycomb structure used as denitrification catalysts in thermal power plants, dioxin decomposition catalysts used in refuse incinerators, etc. Examples thereof include a ceramic molded body having a ceramic honeycomb structure. Therefore, an apparatus and a device for reusing these products by regenerating a honeycomb catalyst from such a product or regenerating a honeycomb catalyst carrier from which a coat layer containing a noble metal catalyst component is separated. The development of a method for this is eagerly desired.

  Recycling of these products includes chemical cleaning methods using chemicals, air blow from an air gun using high-pressure compressed air, blow from a gun nozzle using high water pressure, and mixing air and abrasive. It is conceivable to employ a physical cleaning method such as spraying of the mixture or spraying of a mixture of air, abrasive and water.

  For example, when air blow using high-pressure compressed air is used, the high-pressure compressed air cannot reach the inside of the honeycomb while maintaining a sufficient cleaning power, and removes deposits adhering to the inner wall surface of the honeycomb structure. I can't get enough power. In addition, when blow from a gun using a high water pressure sufficient to remove the deposits attached to the inner wall surface of the honeycomb structure is used, the honeycomb structure is destroyed and cannot be reused. Furthermore, it is possible to use the sound blast method to make it reusable. However, even if either the dry method or the wet method is used, it cannot be ground to the inside of the lattice, so it can be reused. Can not do it.

  For example, in the projection device for regeneration of a deteriorated catalyst described in Patent Document 1, a large number of nozzles corresponding to the respective positions are inserted into a plurality of through holes provided in the catalyst pack, and the abrasive together with air is supplied from each nozzle. By flowing out, the abrasive is introduced into the through hole provided in the catalyst pack, and the surface of the through hole is polished by the flow of air. By doing so, the abrasive can collide with the lattice surface of the through hole, and the catalyst can be regenerated without damaging the surface of the catalyst.

JP 2000-325801 A

  However, in the projection device for regenerating a deteriorated catalyst described in Patent Document 1, since it is necessary to insert a nozzle into each of the plurality of through holes provided in the catalyst pack, a grid-shaped through hole having a small cross section of the through hole There is a problem that it is very difficult to use it for a catalyst pack having (for example, a catalyst pack having a honeycomb structure lattice).

  In addition, since the abrasive is injected from one end of the catalyst pack and flows in, the longer the catalyst pack is, the lower the abrasive power of the abrasive becomes. However, there is a problem that only a portion close to the side where the projection device for regenerating the deteriorated catalyst is attached can be sufficiently ground.

  The present invention has been made in view of such a problem, and the inside of the lattice of the honeycomb structure is obtained without damaging the lattice surface of the honeycomb structure regardless of the length of the grinding object having the honeycomb structure and the size of the honeycomb. It is a main object to provide a grinding apparatus and a grinding method that can sufficiently grind.

  The present invention adopts the following means in order to achieve the main object described above.

The grinding apparatus of the present invention is
A grinding device that grinds the deposits attached to the inner wall surfaces of a plurality of through holes provided in an object,
A mixing section for mixing the abrasive and the gas for grinding the deposit;
A tubular upper fixing member for fixing upward in a state of covering the side surface of the upper end portion of the object; and a tubular lower fixing member for fixing downward in a state of covering the side surface of the lower end portion of the object; A fixing part having
A classifying portion for separating the deposit and the abrasive separated from the through hole;
A dust collecting section for sucking the gas through the classification section;
A connecting member for connecting the upper fixing member and the classifying unit, the lower fixing member and the mixing unit, and the classifying unit and the dust collecting unit;
With
The lower end portion of the lower fixing member is a tubular member having an inner diameter smaller than the inner diameter of the upper end portion of the lower fixing member.
Is.

In this grinding apparatus, an object having a plurality of through-holes with deposits attached to the inner wall surface is covered upward with the upper fixing member and the side surface of the lower end portion is lowered with the lower fixing member. In the covered state, each is fixed downward with a tubular fixing member. The dust collector and classifier, the classifier and the upper fixing member, and the lower fixing member and the mixing unit are each connected by a connecting member. When the gas containing the abrasive is sucked and the gas containing the abrasive passes through the through-hole of the object fixed to the fixed portion, the inner wall surface of the through-hole is ground. In this way, the inner wall surface of the through hole can be ground without damaging the lattice surface of the object having a plurality of through holes (for example, an object having a honeycomb structure). At this time, since the upper end portion of the lower fixing member is a tubular member having an inner diameter larger than the inner diameter of the lower end portion of the lower fixing member, the flow rate of the gas carried in from the lower end side of the lower fixing member is The speed is decelerated at the upper end having a larger inner diameter than the lower end. In this case, it is possible to reduce the possibility that the gas passes through the upper end portion of the lower fixing member at a high speed as compared with the case where the upper end portion and the lower end portion have the same inner diameter. For this reason, it is possible to grind the inner wall surface of the through hole while reducing the possibility of damaging the lattice surface of the object fixed to the fixing portion.

Here, “tubular” means a shape having a space inside, and is a concept including not only a cylindrical shape having a substantially circular cross-sectional area but also a polygonal cross-sectional area. The term “inner diameter” as used herein means the thickness of the inside of the tube. If the cross section of the tube is circular, the diameter is taken. If the cross section of the tube is elliptical, the major axis is taken. If there is, it means each straight line connecting two vertices at the farthest position.

  In the grinding apparatus of the present invention, the lower fixing member may be a tubular member having an inner diameter that increases as it moves from the lower end side to the upper end side. If it carries out like this, the flow velocity of the gas carried in from the lower end part side of the downward fixing member will become slow as the internal diameter of a downward fixing member becomes large. By doing so, the abrasive and the gas are again diffused and mixed, and compared with the case where the inner diameter of the lower fixing member is the same, the gas in which the abrasive is more uniformly diffused and mixed into the through hole. Can be brought in. In other words, the inner wall surface of the through hole can be ground more uniformly.

  In the grinding apparatus of the present invention, the upper fixing member may be a tubular member having an inner diameter that decreases as it moves from the lower end side to the upper end side. In this way, the gas velocity reduced by being carried out from the through hole with a small inner diameter to the upper fixing member with a larger inner diameter gradually decreases the inner diameter of the upper fixing member when the gas moves from the lower end side to the upper end side. Will gradually increase. By doing so, it is possible to increase the velocity of the gas carried out from the upper fixing member as compared to the case where the inner diameter of the upper fixing member is the same at the lower end side and the upper end side. In other words, the ability of the gas to carry the abrasive can be further increased, and the abrasive can be more reliably conveyed to the classification unit. At the same time, it is possible to reduce the possibility that abrasives or deposits accumulate on the upper surface of the object fixed to the fixing portion.

  In the grinding apparatus according to the present invention, an inner diameter of a connecting member that connects the lower fixing member and the mixing portion may be smaller than an inner diameter of an upper end side of the lower fixing member. If it carries out like this, the flow velocity of the gas containing an abrasive will become slower in the lower fixing member than in the connection material which connects a lower fixing member and a mixing part. By carrying out like this, compared with the case where the inner diameter of the upper end side of the lower fixing member is equal to or smaller than the inner diameter of the connecting member, the abrasive passes through the lower fixing member at a high speed and the object fixed to the fixing member The possibility of colliding with the grating surface and damaging the grating surface can be reduced in advance.

  In the grinding apparatus of the present invention, the lower end portion of the upper fixing member may be a tubular member having an inner diameter smaller than the inner diameter of the upper end portion of the lower fixing member. When the gas is carried in from the lower fixing member side of the fixed part, the gas velocity decreases due to the pressure loss that occurs when the gas passes through the object fixed to the fixed part. By making the inner diameter smaller than the inner diameter of the upper end side of the lower fixing member, the gas velocity reduction amount is compared with the case where the inner diameter of the lower end portion of the upper fixing member and the inner diameter of the upper end portion of the lower fixing member are the same. Can be reduced. In other words, since the amount of reduction in the carrying ability of the gas carrying the abrasive can be reduced, the abrasive can be more reliably conveyed to the classification unit.

  The grinding apparatus of the present invention may include a blast gun that supplies a gas containing the abrasive to the mixing unit, and a compressor that supplies a compressed gas to the blast gun. In this way, the abrasive and the gas can be mixed more uniformly as compared with the case where no blast gun is used.

  In the grinding apparatus of the present invention, the object may be a used honeycomb waste catalyst. In order to reuse the used honeycomb waste catalyst, it is necessary to clean or grind the inner wall surface of the honeycomb-shaped through hole. However, this inner wall surface needs to be cleaned or ground. It becomes. By applying the present invention to a used honeycomb waste catalyst, it becomes possible to grind and reuse the inner wall surface of the through hole of such a used honeycomb waste catalyst. Significance of applying the present invention Is big.

The grinding method of the present invention comprises:
A grinding apparatus for grinding a deposit adhered to the inner wall surface of a plurality of through holes provided in an object, wherein the upper part of the tube is fixed upward while covering the side surface of the upper end of the object. Mixing that mixes a fixing member having a fixing member and a tubular lower fixing member that is fixed downward in a state of covering the side surface of the lower end portion of the object, and an abrasive that grinds the deposit and gas A classifying part that separates the deposit and the abrasives separated from the through hole, a dust collecting part that sucks the gas through the classifying part, the upper fixing member, the classifying part, A lower fixing member and the mixing portion, and a connecting member for connecting the classification portion and the dust collecting portion, and the lower end portion of the lower fixing member has an inner diameter smaller than the inner diameter of the upper end portion of the lower fixing member. using grinding apparatus is a tubular member having a In grinding method for grinding the inner wall surface of the through hole,
a) a fixing step of fixing the object to the fixing member;
b) a mixing step of mixing the abrasive and gas in the mixing unit;
c) a suction step in which the dust collection unit sucks the gas through the classification unit;
d) A grinding step for grinding the inner wall surface of the through-hole by passing the abrasive mixed in the mixing step through the inside of the through-hole as the gas is sucked in the suction step;
Is included

In the grinding method of the present invention, the adhering matter adhering to the inner wall surface of the plurality of through-holes provided in the object is upward with the upper fixing member covering the side surface of the upper end, and the lower fixing member has the lower end. Each side is fixed to the lower side while covering the side surface. Dust collector and classifier, classifier and upper fixing member,
Since the lower fixing member and the mixing portion are respectively connected by a connecting member, when the gas is sucked under reduced pressure by the dust collecting portion, the gas containing the abrasive mixed in the mixing portion to be connected is sucked and this abrasive is used. When the contained gas passes through the through-hole of the object fixed to the fixed portion, the inner wall surface of the through-hole is ground. In this way, the inner wall surface of the through hole can be ground without damaging the lattice surface of the object having a plurality of through holes (for example, an object having a honeycomb structure). At this time, since the upper end portion of the lower fixing member is a tubular member having an inner diameter larger than the inner diameter of the lower end portion of the lower fixing member, the flow rate of the gas carried in from the lower end side of the lower fixing member is The speed is decelerated at the upper end having a larger inner diameter than the lower end. In this case, it is possible to reduce the possibility that the gas passes through the upper end portion of the lower fixing member at a high speed as compared with the case where the upper end portion and the lower end portion have the same inner diameter. For this reason, it is possible to grind the inner wall surface of the through hole while reducing the possibility of damaging the lattice surface of the object fixed to the fixing portion. In the grinding method of the present invention, a step for realizing the function of any of the above-described grinding devices may be added.

FIG. 1 is a schematic diagram showing an outline of the configuration of the inner wall grinding apparatus 20. FIG. 2 is a schematic diagram showing an outline of the configuration of the fixed unit 30. FIG. 3 is a schematic view showing an outline of the honeycomb structured mold 10. FIG. 4 is a photograph showing the lattice surface of the honeycomb structure-type molded body 10 before grinding. FIG. 5 is a photograph showing the lattice surface of the honeycomb structure molded body 10c after grinding. FIG. 6 is a photographic view showing a cut surface of the central portion of the honeycomb structure molded body 10c after grinding. FIG. 7 is a comparative photograph showing a comparison between the lattice surface (A) of the honeycomb structured mold 10 and the lattice surface (B) of the honeycomb structured mold 10c.

  Here, in describing an example of an embodiment of the present invention with reference to the drawings, the correspondence between the components of the embodiment of the present invention and the components of the present invention will be clarified. The inner wall grinding apparatus 20 of the present embodiment corresponds to the grinding apparatus of the present invention, the honeycomb structure molded body 10 corresponds to the object, the through hole 12 corresponds to the through hole, and the deposit 14 is the deposit. The upper fixing member 34 corresponds to the upper fixing member, the lower fixing member 32 corresponds to the lower fixing member, the fixing unit 30 corresponds to the fixing portion, the abrasive 80 corresponds to the abrasive, the mixing chamber 40 corresponds to a mixing section, the cyclone separator 50 corresponds to a classification section, the dust collection section 60 corresponds to a dust collection section, the transport pipe 72, the transport pipe 74, and the transport pipe 76 correspond to connecting members, and a sandblast gun 44 corresponds to a blast gun, and the compressor 49 corresponds to a compressor. An example of the grinding method of the present invention is also clarified by explaining how to use the inner wall grinding device 20.

  As shown in FIG. 1, the inner wall grinding apparatus 20 of the present embodiment includes a fixing unit 30 that fixes the honeycomb structured mold 10, a mixing chamber 40 that mixes air and an abrasive 80, and an abrasive 80. And a cyclone separator 50 that separates the deposit 14 ground from the honeycomb structure molded body 10, a dust collection unit 60 that sucks air in the inner wall grinding apparatus 20 to separate and recover the deposit 14, and a sandblast gun 44 And a compressor 49 for supplying compressed air whose pressure is adjusted by an air regulator 46. The fixed unit 30 and the mixing chamber 40 are connected in a sealed state by a transport pipe 72, the fixed unit 30 and the cyclone separator 50 are connected by a transport pipe 74, and the cyclone separator 50 and the dust collecting unit 60 are connected by a transport pipe 76, respectively. ing. In addition, all the deposit | attachment 14 which detached | separated from the abrasive 80 and the through-hole 12 in FIG. 1 was described typically for description, and all are described larger than the actual magnitude | size. In the present specification, “inner wall surface” means a wall surface portion of the through-hole 12, and “lattice surface” means an upper end side or a lower end side of the honeycomb structure-type molded body 10.

  As shown in FIG. 3, the honeycomb structure-type molded body 10 has a substantially elliptic cylinder shape having a honeycomb structure, and a plurality of through holes 12 penetrating in the height direction of the substantially elliptic cylinder are arranged in a lattice pattern. This honeycomb structure-type molded body 10 is taken out from a used car converter. These through holes 12 have a substantially quadrangular prism shape, and a catalyst layer (not shown) is provided on the entire inner wall surface of the through holes 12. In addition, since the honeycomb structure-type molded body 10 is used for purification of automobile exhaust gas, compounds generated by a chemical reaction between the catalyst and the exhaust gas and incomplete combustion of the engine are formed on the surface of a catalyst layer (not shown). The deposits 14 such as wrinkles generated due to the above are adhered unevenly. Here, FIG. 3 is a schematic diagram showing an outline of the configuration of the honeycomb structure-type molded body 10. For the sake of explanation, the through hole 12 is shown larger than the actual one, and the deposit 14 is the inside of the through hole 12. This is a conceptual description of the state of adhering to the wall surface, and the state of adhering to the real object varies depending on the individual use state.

As shown in FIGS. 1 and 2, the fixing unit 30 includes a lower fixing member 32 that fixes the lower end portion of the honeycomb structure molded body 10 and an upper fixing member that fixes the upper end portion of the honeycomb structure molded body 10. The honeycomb structure molded body 10 is fixed by the lower fixing member 32 and the upper fixing member 34. The lower fixing member 32 is fixed so as to cover the lower end side of the honeycomb structure molded body 10 from the side surface side by the upper end portion 32a on the upper side, and the lower end portion 32b on the lower side is sealed with the transport pipe 72. Linked in state. The lower fixing member 32 has an inner diameter of the lower end portion 32b smaller than an inner diameter of the upper end portion 32a, and has a gentle slope from the lower end portion 32b toward the upper end portion 32a. Similarly, the upper fixing member 34 is fixed so that the lower end portion 34a on the lower side covers the upper end side of the honeycomb structure molded body 10 from the side surface side, and the upper end portion 34b on the upper side is connected to the transport pipe 74. They are connected in a sealed state. The upper fixing member 34 has an inner diameter of the lower end portion 34a larger than an inner diameter of the upper end portion 34b, and has a gentle inclination from the lower end portion 34a toward the upper end portion 34b. When the honeycomb structure molded body 10 is fixed to the fixed unit 30 by the fixing unit 30 configured as described above, the through hole 12 is transferred to the transfer pipe 72 and the transfer via the lower fixing member 32 and the upper fixing member 34. Air that includes the abrasive 80 and communicates with the pipe 74 can pass through the through hole 12 .

  As shown in FIG. 1, the mixing chamber 40 has a substantially funnel-shaped space at the center, and has an outside air inlet 42 for sucking outside air upward. The lower part of the substantially funnel-shaped space is connected to the transport pipe 72 in a sealed state. Further, four sandblast guns 44, which are F2-4 type gun units manufactured by Fuji Seisakusho, are provided inside, and the injection ports of the sandblast guns 44 are respectively directed toward the inclined surface of the substantially funnel-shaped lower part. The sandblast gun 44 is connected to a compressor 49 via an air regulator 46 and a cyclone separator 50 via an abrasive hose 48, respectively. Therefore, when the sandblast gun 44 is operated, the compressed air supplied from the compressor 49 is adjusted to a desired pressure by the air regulator 46 and supplied to the sandblast gun 44. By doing so, an ejector effect is produced, and the abrasive 80 is supplied from the cyclone separator 50. The abrasive 80 and compressed air are uniformly mixed inside the sandblast gun 44 and injected into the mixing chamber 40, and the compressed air containing the injected abrasive 80 is sucked from the outside air inlet 42. It is mixed with the outside air and conveyed to the inside of the honeycomb structure molded body 10 attached to the fixed unit 30 via the conveyance pipe 72. If necessary, the pressure of compressed air supplied to the sandblast gun 44 is adjusted by adjusting the air regulator 46, and the ejector effect is changed to change the abrasive 80 injected from the sandblast gun 44. The amount of can be adjusted.

The cyclone separator 50 is a known cyclone classifier and is disposed at a position higher than the mixing chamber 40. The cyclone separator 50 is connected in a sealed state to the upper fixing member 34 via the conveyance pipe 74, the dust collecting unit 60 via the conveyance pipe 76, and the sandblast gun 44 via the abrasive hose 48. Yes. The abrasive 80 and the deposit 14 conveyed to the cyclone separator 50 via the conveyance pipe 74 are separated into the abrasive 80 and the air containing the deposit 14 by the cyclone separator 50. The separated abrasive 80 falls and accumulates under the cyclone separator 50 due to its own weight, and is supplied again to the sandblast gun 44 through the abrasive hose 48. At this time, since the cyclone separator 50 side of the abrasive hose 48 is located higher than the sand blast gun 44 side of the abrasive hose 48, the pressure of the compressed air from the compressor 49 is supplied when the abrasive 80 is supplied to the sand blast gun 44. Even if is small, the ejector effect can be fully utilized. The abrasive hose 48 is preferably attached as short as possible and without slack. By doing so, the ejector effect can be utilized more effectively.

The dust collection unit 60 is a known dust collection device, and for example, Mi-306 manufactured by Amano Co., Ltd. can be used. The dust collection unit 60 is connected to the cyclone separator 50 in a sealed state via a transport pipe 76. Inside the dust collecting unit 60, a cartridge filter 62 and a blower motor (not shown) capable of changing the number of rotations are provided, and the deposit 14 contained in the air can be collected. Further, since the deposit 14 collected by the cartridge filter 62 is periodically wiped off by a pulse jet and stored in the storage section 64 provided at the lower portion, the deposit 14 is collected at a desired timing. Can do. On the other hand, clean air that has passed through the cartridge filter 62 is discharged into the atmosphere from the exhaust duct 66 .

  The abrasive 80 is TGE-30 manufactured by IKK SHOT Co., Ltd., and is a hardened steel grit with high hardness. The average particle diameter is about 0.3 mm, and the shape is not the same, but it has at least one acute angle.

  Next, a method of grinding the inner wall surface of the through-hole 12 of the honeycomb structured molded body 10 and removing the deposit 14 by the inner wall grinding apparatus 20 of the present embodiment configured as described above will be described in detail.

  First, the honeycomb structure molded body 10 to be fixed to the fixing unit 30 was washed downward. Specifically, the honeycomb structure molded body 10 is removed from the demolished scrap car converter so as not to be damaged, and ultrasonic output is performed using an ultrasonic cleaner (UC-600A manufactured by Sharp Manufacturing System Co., Ltd.). Ultrasonic cleaning was performed at 600 W and a water temperature of 45 ° C. for about 30 minutes. Next, using an air blow gun (manufactured by Vessel Co., Ltd., AD-2 100N-PB), air was blown for about 3 minutes at a pressure of 0.5 megapascal.

  After the bottom cleaning is performed twice by the above-described method to clean the honeycomb structure molded body 10 to some extent, a large blow low temperature dryer (model: DRL823WA, heater capacity: 6 KW) manufactured by Toyo Seisakusho Co., Ltd. is used. , And dried at 90 ° C. for 8 hours. By doing so, a honeycomb structure molded body 10 having a major axis of about 142.7 mm, a minor axis of about 98.0 mm, a length of about 149.5 mm and a weight of about 938 g was obtained. The lattice surface of the honeycomb structure molded body 10 at this time was photographed, and an enlarged photograph of this photograph is shown in FIG. 4 as a photographic diagram showing the lattice surface of the honeycomb structure molded body 10 before removing the deposits. In addition, the gauge in FIG. 4 is a gauge with one scale of 0.05 mm. As shown in FIG. 4, it can be visually confirmed that the deposits 14 are irregularly adhered to the inner wall surface of the through hole 12.

Next, the honeycomb structure molded body 10 was fixed to the fixed unit 30. Specifically, the side surface of the lower end portion of the honeycomb structure molded body 10 is covered with the upper end portion 32a of the lower fixing member 32, and the side surface of the upper end portion of the honeycomb structure molded body 10 is the lower end portion 34a of the upper fixing member 34. (See FIG. 2). Since the lower end portion 32b of the lower fixing member 32 and the upper end portion 34b of the upper fixing member 34 are connected to the transport pipe 72 and the transport pipe 74 in a sealed state, respectively, when the air on the transport pipe 74 side is sucked, the transport pipe The air in 72 passes through the through hole 12 and moves to the transport pipe 74. At this time, the inner diameter of the lower end portion 34 a of the upper fixing member 34 is smaller than the inner diameter of the upper end portion 32 a of the lower fixing member 32. The speed of the air decreases due to the pressure loss that occurs when the air containing the abrasive 80 passes through the fixing unit 30 from the lower fixing member 32 side. However, by reducing the inner diameter on the upper fixing member 34 side, Compared with the case where the magnitude | size of is the same, the air speed fall amount can be reduced.

  Since the lower fixing member 32 has an inner diameter that increases in an inclined manner from the lower end portion 32b toward the upper end portion 32a, when the lower fixing member 32 reaches the lower fixing member 32 in a state where the abrasive 80 and air are mixed, the lower fixing member As the upper end portion 32a of 32 is approached, the flow velocity of air decreases. By doing so, the speed decreases immediately before the abrasive 80 reaches the honeycomb structure molded body 10, and the possibility that the lattice surface of the honeycomb structure molded body 10 is damaged due to the collision of the high speed abrasive 80 is reduced. can do. At this time, since the inner diameter gradually increases from the lower end portion 32b toward the upper end portion 32a, the speed of the air containing the abrasive 80 gradually decreases. By doing so, the air and the abrasive 80 are mixed again, and the air containing the abrasive 80 mixed in a more uniform state is conveyed to the through hole 12 as compared with the case where the inner diameter is the same. can do. In addition, since the inner diameter of the transport pipe 72 is smaller than the inner diameter of the upper end portion 32a of the lower fixing member 32, the flow velocity when passing through the upper end portion 32a of the lower fixing member 32 is lower than in the transport pipe 72. The possibility of damaging the lattice surface of the honeycomb structure molded body 10 can be reduced.

  On the other hand, since the inner diameter of the upper fixing member 34 is decreased in an inclined manner from the lower end portion 34a to the upper end portion 34b, the flow velocity decreased by being conveyed from the narrow through hole 12 to the wide upper fixing member 34, As the inner diameter gradually decreases, the flow velocity gradually increases again. By carrying out like this, compared with the case where an internal diameter is the same, the velocity of gas can be made to increase more. In other words, the abrasive 80 can be more reliably conveyed to the cyclone separator 50 with the air flow.

  Subsequently, the pressure of the air regulator 46 was adjusted to a pressure at which 3.0 kg of abrasive 80 was supplied from the sandblast gun 44 per minute, and the abrasive 80 was sprayed from the sandblast gun 44. At this time, the injection port of the sandblast gun 44 is directed to a substantially funnel-shaped slope provided in the lower portion of the mixing chamber 40, and of the four sandblast guns 44 disposed in the mixing chamber 40, Only two bottles were used and injected this time. Further, the rotational speed of a blower motor (not shown) of the dust collecting unit 60 is set so that the wind speed in the vicinity of the lower end 34a of the upper fixing member 34 becomes an average of 10 meters per second (actual measurement value: 10.6 meters), and penetrates for 15 minutes. The inner wall surface of the hole 12 was ground. In addition, when the pressure loss of the upper end part 32a of the lower fixing member 32 at this time and the lower end part 34a of the upper fixing member 34 was measured, the lower end part 34a of the upper fixing member 34 was 1.59 kilopascals lower.

  The honeycomb structure molded body 10 obtained by grinding the inner wall surface of the through-hole 12 is removed from the fixed unit 30 and an air blow gun (manufactured by Vessel Co., Ltd., AD-2 100N-PB) is used to apply a pressure of 0.5 megapascal. The air blow was performed for about 3 minutes to remove the residue remaining on the surface of the honeycomb structure molded body 10 and the inner wall surface of the through hole 12, and the mass of the honeycomb structure molded body 10 was measured to be 849 g. By doing so, a honeycomb structured molded body 10a having been ground for the first time was obtained.

  Next, in the same manner as in the case of the honeycomb structured mold 10, the honeycomb structured mold 10 a was ground and air-blown to obtain a second ground honeycomb structured mold 10 b. When the mass of the honeycomb structure molded body 10b was measured, it was 826 g.

  Finally, in the same manner as in the case of the honeycomb structured mold 10, the honeycomb structured mold 10 b was ground and air-blown to obtain a third ground honeycomb structured mold 10 c. When the mass of the honeycomb structure molded body 10c was measured, it was 789 g. The mass of the honeycomb structure molded body 10c is 149 g less than the mass of the honeycomb structure molded body 10, and it can be said that the deposit 14 attached to the inner wall surface of the through hole 12 can be removed by grinding. .

The honeycomb structure-shaped molded body 10c after the third grinding process thus obtained was observed in more detail. First, photographs were taken for the lattice surface and the vicinity of the central portion of the third honeycomb structure molded body 10c that had been subjected to the grinding process, and are shown as FIGS. Here, FIG. 5 is a photograph showing the grating surface of the honeycomb structural molded body 10c after deposit removal, FIG. 6 shows a cross section of the central portion of the honeycomb structure molded body 10c after deposit removal It is a photograph. Moreover, the gauge in FIG.5 and FIG.6 is a gauge whose 1 scale is 0.05 mm. As is apparent from these photographs, the deposit 14 was hardly visible on the inner wall surface of the through hole 12 in any of the photographs on the lattice surface and in the vicinity of the center. This is consistent with the result that the mass of the honeycomb structure molded body 10 is reduced by 149 g before and after the removal of deposits by grinding the inner wall surface of the through hole 12. Therefore, also from this, it is clear that the deposit 14 has been removed by the inner wall grinding apparatus 20 .

  Next, the lattice surface of the third honeycomb structure molded body 10c that was ground was compared with the honeycomb structure molded body 10 before grinding. Here, FIG. 7 is a comparative photographic view comparing the lattice surfaces of the honeycomb structured molded body 10 before and after grinding, where (A) shows the honeycomb structured molded body 10 before grinding, and (B) shows 3 This is a photograph of each of the honeycomb structure molded bodies 10c that have been ground. As is clear from FIG. 7, no noticeable damage was observed on the lattice surface even in the photographic view (see (B)) showing the lattice surface of the third-grinded honeycomb structure-type molded body 10c. From this, it is clear that the lattice surface of the honeycomb structure molded body 10 was hardly damaged even when the inner wall grinding apparatus 20 was used for grinding three times.

According to the grinding apparatus of the present embodiment described in detail above, the side surface of the upper end portion of the used honeycomb structure molded body 10 is fixed by the upper fixing member 34 and the side surface of the lower end portion is fixed by the lower fixing member 32, respectively. Then, the air containing the abrasive 80 mixed in the mixing chamber 40 is subjected to high-speed turbulent flow inside the through-hole 12 by drawing the air under reduced pressure by the dust collecting unit 60 and drawing an irregular trajectory. pass. At this time, the abrasive 80 grinds the inner wall surface of the through hole 12 to remove the deposit 14. By doing so, the inner wall surface of the through-hole 12 can be ground without damaging the lattice surface of the used honeycomb structure-type molded body 10.

  Moreover, since the upper end part 32a of the lower fixing member 32 is a tubular member having an inner diameter larger than the inner diameter of the lower end part 32b, the air containing the abrasive 80 carried into the lower fixing member 32 from the lower end part 32b side. When carrying out from the downward fixing member 32, it decelerates. By doing so, compared with the case where the inner diameter of the lower fixing member 32 is the same, the high-speed abrasive 80 collides with the lattice surface of the honeycomb structure molded body 10 fixed to the upper end portion 32a of the lower fixing member 32. In addition, the possibility that the lattice surface of the honeycomb structure-type molded body 10 is damaged can be further reduced.

  Furthermore, since the lower fixing member 32 is a tubular member having an inner diameter that increases as it moves from the lower end portion 32b to the upper end portion 32a, the grinding material carried into the lower fixing member 32 from the lower end portion 32b side. The air containing 80 is gradually decelerated inside the lower fixing member 32. By doing so, the abrasive 80 and air are diffused and mixed again, and compared with the case where the inner diameter of the lower fixing member 32 is the same, the abrasive 80 is more uniformly diffused and mixed. Air can be carried in. In other words, the inner wall surface of the through hole 12 can be ground more uniformly.

  Furthermore, since the upper fixing member 34 is a tubular member whose inner diameter decreases as it moves from the lower end portion 34a side to the upper end portion 34b side, the air carried into the upper fixing member 34 from the lower end portion 34a side is As it passes through the inside of the upper fixing member 34, it gradually accelerates. By doing so, the air that has been decelerated due to being carried into the upper fixing member 34 from the through-hole 12 having a small passage area is re-accelerated, and more reliably compared to the case where the inner diameter of the upper fixing member 34 is the same. The abrasive 80 can be conveyed to the cyclone separator 50.

  Further, since the inner diameter of the transport pipe 72 is smaller than the inner diameter of the upper end portion 32 a of the lower fixing member 32, when compressed air including the abrasive 80 is carried into the lower fixing member 32, the speed in the transport pipe 72 is exceeded. Will also slow down. By doing so, compared with the case where the inner diameter of the transport pipe 72 is equal to or larger than the inner diameter of the upper end portion 32a of the lower fixing member 32, the abrasive 80 collides with the lower end portion of the honeycomb structure molded body 10 at a high speed. The possibility of damaging the grating surface can be further reduced.

  Furthermore, the inner diameter of the lower end portion 34 a of the upper fixing member 34 is smaller than the inner diameter of the upper end portion 32 a of the lower fixing member 32, so that The speed of air increases. When air is carried into the fixing unit 30 from the lower fixing member 32 side, the speed of the air is reduced due to the pressure loss generated when passing through the honeycomb structure molded body 10, but the inner diameter of the upper fixing member 34 and the lower fixing are fixed. Compared to the case where the inner diameter of the member 32 is the same, the amount of decrease in the air speed can be reduced. In other words, it is possible to reduce the amount of decrease in the carrying capacity of air carrying the abrasive 80, so that the abrasive 80 can be more reliably carried to the cyclone separator 50.

  In addition, in the mixing chamber 40, the compressed air supplied from the compressor 49 via the air regulator 46 and the abrasive 80 are mixed using the sand blast gun 44, so that compared with the case where the sand blast gun 44 is not used. Thus, the air and the abrasive 80 can be more uniformly mixed. At this time, the ejection amount of the abrasive 80 ejected from the sandblast gun 44 can be finely adjusted by adjusting the pressure of the compressed air by the air regulator 46, so the amount of the abrasive 80 necessary for grinding is controlled. Then, it can be supplied to the honeycomb structured mold 10.

  In addition, the used honeycomb structure molded body 10 has through holes 12, and the inner wall surface of the through holes 12 required for reusing the used honeycomb structure molded body 10 is cleaned or ground. For this purpose, a great deal of labor is required, so that the significance of grinding using the inner wall grinding apparatus 20 is great.

  It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be implemented in various modes as long as it belongs to the technical scope of the present invention.

  For example, in the above-described embodiment, the honeycomb structured mold 10 is a used cordierite ceramic catalyst taken out from a used car converter, but is not limited thereto. For example, a ceramic catalyst having a honeycomb structure used as a denitration catalyst for a thermal power plant, various boilers, a combustion furnace, etc., or a ceramic catalyst having a honeycomb structure used as a dioxin decomposition catalyst for a dust incinerator, etc. It may be. Regardless of the purpose of use of the honeycomb structure-type molded body 10, if it is necessary to grind the inner wall surface of the through-hole 12, the same effects as those of the above-described embodiment can be obtained. .

  In the above-described embodiment, the catalyst layer (not shown) is provided on the entire inner wall surface of the through hole 12. However, the honeycomb structure molded body 10 itself is formed of a catalyst material. May be. Even in this case, the same effect as that of the above-described embodiment can be obtained by grinding the catalyst surface located on the inner wall surface of the through hole 12.

  In the above-described embodiment, the honeycomb structure-type molded body 10 made of ceramics and having an approximately elliptical column shape is used. However, the material is not limited to ceramics. For example, iron, aluminum alloy, stainless steel, titanium It may be made of a metal such as an alloy, and may be made of a resin such as a phenol resin or a polyester resin. Further, the shape is not limited to a substantially elliptical column shape, and may be a columnar shape, for example, a rectangular column shape such as a quadrangular column, a pentagonal column, or a hexagonal column. Furthermore, the shape of the through hole 12 is not limited to a substantially quadrangular prism shape, and may be a prismatic shape such as a pentagonal column or a hexagonal column, or may be a cylindrical shape or an elliptical column shape. In either case, the same effect as the above-described embodiment can be obtained.

  In the above-described embodiment, the four sandblast guns 44 are provided in the mixing chamber 40. However, the number of the sandblast guns to be arranged is not limited to four. Ten units may be sufficient and 3-7 units may be sufficient. A grinding material 80 to be supplied to the inside of the honeycomb structure molded body 10 due to the amount of the deposit 14 adhering to the inner wall surface of the through hole 12, the size of the inner diameter of the through hole 12, the suction performance of the dust collecting portion 60, and the like. Depending on the amount, the number of sandblast guns can be selected as appropriate.

  In the embodiment described above, the pressure of the air regulator 46 is adjusted to the pressure at which 3.0 kg of abrasive 80 is supplied from the sandblast gun 44 per minute, but the abrasive 80 is injected from the sandblast gun 44. The pressure is not limited to this, and any pressure that allows the sandblast gun 44 to eject the abrasive 80 may be used. Even in such a case, the same effect as the above-described embodiment can be obtained.

  In the above-described embodiment, the compressor 49 supplies compressed air to the sandblast gun 44 via the air regulator 46. However, the compressor 49 may supply compressed air to the air regulator 46 via a known receiver tank. . By doing so, since the pressure of the air supplied to the air regulator 46 is stabilized, it becomes easier to finely adjust the pressure of the compressed air by the air regulator 46 than when the receiver tank is not used. In other words, since the pressure of the air supplied to the sandblast gun 44 is stabilized, the compressed air including the abrasive 80 ejected from the sandblast gun 44 is also ejected in a stable state as compared with the case where the receiver tank is not used. be able to.

  In the above-described embodiment, the lower fixing member 32 and the upper fixing member 34 are fixed so as to cover from the side surface side of the end portion of the honeycomb structure molded body 10, but the lower fixing member 32 and the upper fixing member 34 are provided. For example, a cushioning material such as urethane having a hardness of about 50 with high flexibility and wear resistance may be provided at a position in contact with the side surface of the honeycomb structure molded body 10. In this way, when the honeycomb structured mold 10 is fixed to the fixing unit 30, a buffer material is interposed between the honeycomb structured mold 10 and the lower fixing member 32, and between the honeycomb structured mold 10 and the upper fixing member 34. Since it will be pinched | interposed, possibility that the honeycomb structure molded object 10 will be damaged can be reduced.

  In the above-described embodiment, the honeycomb structure molded body 10 is fixed by the lower fixing member 32 and the upper fixing member 34. However, the honeycomb structure molded body 10 has a holding member that holds the side surface side of the central portion. May be. In this way, even the honeycomb structure molded body 10 that cannot be fixed only by the upper and lower ends of the honeycomb structure molded body 10 can be fixed at a desired position.

  In the above-described embodiment, the lower end portion 32b of the lower fixing member 32 and the transport pipe 72 are connected in a sealed state. However, the transport pipe 72 is disposed long in the same direction as the direction of the through hole 12. It is preferable to arrange at least 1 meter or more. In this way, when air is transported into the through-hole 12, the air travels linearly in a state where the abrasive 80 and the air are mixed, so that the transport pipe 72 is curved immediately before being connected to the lower fixing member 32. Compared with the case where it is carrying out, it can convey in the state by which air and the grinding material 80 were mixed more uniformly by the through-hole 12. FIG. In other words, the inner wall surface of the through hole 12 can be more uniformly ground.

  In the above-described embodiment, TGE-30 manufactured by IKK Shot Co., Ltd. was used as the abrasive 80. However, the material has higher hardness than the material of the honeycomb structure molded body 10 to be ground and the deposit 14. However, it is not limited to this as long as it has a shape having an acute angle, for example, metal steel grit, steel cut wire, ceramic alumina, alumina / zirconia, silicon carbide, zircon grit, silica sand, etc. It may be used. Even if these are used, the same effect as the above-described embodiment can be obtained.

  In the above-described embodiment, the abrasive 80 has at least one acute angle, but the shape of the abrasive 80 may have many acute angles. If the number of acute angles increases, the possibility of an acute angle colliding with the inner wall surface of the through-hole 12 increases as compared with the case where the acute angle is small, and the grinding force for grinding can be improved.

  In the above-described embodiment, the average particle diameter of the abrasive 80 is about 0.3 mm. However, the average particle diameter of the abrasive 80 is determined by the lattice opening of the honeycomb structure molded body 10 to be ground. It can be selected appropriately. At this time, the average particle diameter of the abrasive 80 is preferably 0.05 to 0.5, preferably 0.1 to 0.3, when the size of the opening is 1 with respect to the opening of the lattice. More preferred. When the particle size is smaller than 0.05, the grinding force of the abrasive 80 is too small and the inner wall surface of the through hole 12 may not be sufficiently ground. If it is larger than .5, the abrasives 80 are entangled inside the through-hole 12, and the possibility that the through-hole 12 is clogged increases, which is not preferable.

  In the above-described embodiment, the rotational speed of the blower motor (not shown) of the dust collection unit 60 is set so that the wind speed near the upper end 34b of the upper fixing member 34 is 10 meters per second (actual measurement value 10.6 meters). The speed is not limited to this as long as it is 5.0 meters / second or more, and may be, for example, 8.0 meters / second to 30.0 meters / second. When the wind speed is slower than 5.0 meters per second, the abrasive 80 may not be able to get on the air flow and may not reach the lower fixing member 32, which is not preferable, and when the wind speed is faster than 30.0 meters per second. Is not preferable because the abrasive 80 may collide with the lattice surface of the honeycomb structured molded body 10 to damage the lattice surface.

  In the above-described embodiment, Mi-306 manufactured by Amano Co., Ltd. was used as the dust collection unit 60. However, the dust collection unit 60 has an air volume and a static pressure necessary for grinding and can collect very fine powder. If it is, it will not be limited to this, A well-known various dust collector can be used. Here, the extremely fine powder means one having a particle diameter of about 10 micrometers or less.

  In the above-described embodiment, the abrasive 80 is transported using air, but the gas used is not limited to air. For example, an inert gas such as argon or nitrogen, ozone gas, or carbon dioxide gas Etc. may be used. For example, when an inert gas is used, it can also be used when the honeycomb structured mold 10 or the deposit 14 contains a component having high reactivity with air, and when carbon dioxide is used. Even when the deposit 14 contains a combustible component, it can be used. Thus, the inner wall grinding apparatus 20 can be used for various honeycomb structure molded bodies 10 by appropriately changing the gas used depending on the components contained in the deposit 14.

  As shown in the above-described embodiment, the field of reuse of used honeycombs, in particular, the separation and removal of the layer formed by coating on the inner wall of the lattice shape of the ceramic molded body having a honeycomb structure, and the foreign matter attached to the inner wall It is possible to use for removing or removing the deteriorated layer on the inner wall by grinding.

  DESCRIPTION OF SYMBOLS 10 ... Honeycomb structure type molded object, 10a ... Honeycomb structure type molded object, 10b ... Honeycomb structure type molded object, 10c ... Honeycomb structure type molded object, 12 ... Through-hole, 14 ... Deposit, 20 ... Inner wall grinding processing apparatus, 30 ... Fixing unit, 32 ... Lower fixing member, 32a ... Upper end part, 32b ... Lower end part, 34 ... Upper fixing member, 34a ... Lower end part, 34b ... Upper end part, 40 ... Mixing chamber, 42 ... Outside air inlet, 44 ... Sand blast Gun, 46 ... Air regulator, 48 ... Grinding material hose, 49 ... Compressor, 50 ... Cyclone separator, 60 ... Dust collecting part, 62 ... Cartridge filter, 64 ... Storage part, 66 ... Exhaust duct, 72 ... Conveying pipe, 74 ... Conveying pipe, 76... Conveying pipe, 80.

Claims (8)

A grinding device that grinds the deposits attached to the inner wall surfaces of a plurality of through holes provided in an object,
A mixing section for mixing the abrasive and the gas for grinding the deposit;
A tubular upper fixing member for fixing upward in a state of covering the side surface of the upper end portion of the object; and a tubular lower fixing member for fixing downward in a state of covering the side surface of the lower end portion of the object; A fixing part having
A classifying portion for separating the deposit and the abrasive separated from the through hole;
A dust collecting section for sucking the gas through the classification section;
A connecting member for connecting the upper fixing member and the classifying unit, the lower fixing member and the mixing unit, and the classifying unit and the dust collecting unit;
With
The lower end portion of the lower fixing member is a tubular member having an inner diameter smaller than the inner diameter of the upper end portion of the lower fixing member.
Grinding equipment. The lower fixing member is a tubular member whose inner diameter increases as it moves from the lower end side to the upper end side.
The grinding apparatus according to claim 1 . The upper fixing member is a tubular member whose inner diameter decreases as it moves from the lower end side to the upper end side.
The grinding apparatus according to claim 1 or 2 . The inner diameter of the connecting member that connects the lower fixing member and the mixing portion is smaller than the inner diameter of the upper end side of the lower fixing member.
The grinding apparatus of any one of Claims 1-3 . The lower end portion of the upper fixing member is a tubular member having an inner diameter smaller than the inner diameter of the upper end portion of the lower fixing member.
The grinding apparatus of any one of Claims 1-4 . In the grinding device according to any one of claims 1 to 5 ,
A blast gun for supplying a gas containing the abrasive to the mixing section;
A compressor for supplying compressed gas to the blast gun;
With
Grinding equipment. The object is a spent honeycomb waste catalyst.
The grinding apparatus of any one of Claims 1-6 . A grinding device that grinds the deposits attached to the inner wall surfaces of a plurality of through-holes provided in an object, the mixing unit for mixing an abrasive and gas for grinding the deposits, and the object A tubular upper fixing member that is fixed upward while covering the side surface of the upper end of the tube, and a tubular lower fixing member that is fixed downward while covering the side surface of the lower end portion of the object. A classifying part that separates the deposit and the abrasives separated from the through hole, a dust collecting part that sucks the gas through the classifying part, the upper fixing member, the classifying part, A lower fixing member and the mixing portion, and a connecting member for connecting the classification portion and the dust collecting portion, and the lower end portion of the lower fixing member has an inner diameter smaller than the inner diameter of the upper end portion of the lower fixing member. using grinding apparatus is a tubular member having a In grinding method for grinding the inner wall surface of the through hole,
a) a fixing step of fixing the object to the fixing member;
b) a mixing step of mixing the abrasive and gas in the mixing unit;
c) a suction step in which the dust collection unit sucks the gas through the classification unit;
d) A grinding step for grinding the inner wall surface of the through hole by passing the abrasive mixed in the mixing step through the inside of the through hole in accordance with the suction of the gas in the suction step;
Including a grinding method.