Evaluation device and evaluation method for honeycomb structure

Abstract

To provide an evaluation device of a honeycomb structure capable of quickly evaluating durability of the honeycomb structure at the time of a load by both heat and vibration.SOLUTION: An evaluation device for a honeycomb structure includes an accommodation part 10 capable of accommodating a honeycomb structure 1, a vibration generator 20 capable of vibrating the accommodation part 10 in a vertical direction, a connection structure part 30 connecting the accommodation part 10 and the vibration generator 20, an exhaust gas generator 40 capable of generating exhaust gas, and a pipe 50 connected to the exhaust gas generator 40 and capable of supplying exhaust gas to the accommodation part 10. The pipe 50 is inserted into the connection structure part 30 and arranged so as not to come into contact with the connection structure part 30.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an evaluation device and an evaluation method for a honeycomb structure. [Background technology]

[0002] PM (particulate matter) and NOx (nitrogen oxides) in exhaust gases emitted from internal combustion engines such as diesel and gasoline engines have a significant impact on both the human body and the environment, and there is an increasing need to reduce their emissions into the atmosphere. Under these circumstances, development is underway for exhaust gas purification devices equipped with filters (diesel particulate filters [DPF] and gasoline particulate filters [GPF]) for removing PM and catalysts useful for reducing NOx to nitrogen and water, and honeycomb structures are commonly used as filters and catalyst carriers.

[0003] It is desirable to evaluate the durability of honeycomb structures used in exhaust gas purification devices under the actual environment in which they are used, but this is not practical because it takes a long time to evaluate them. Therefore, tests are being conducted that simulate the actual environment in which they are used. For example, Patent Document 1 proposes a ceramic structure evaluation device that includes a predetermined exhaust gas generation device and a sample holder that is connected to the exhaust gas generation device and that stores a ceramic structure (honeycomb structure) as an evaluation sample, and that evaluates the ceramic structure by supplying exhaust gas from the exhaust gas generation device.This ceramic structure evaluation device makes it possible to evaluate the durability (including thermal shock resistance) of the ceramic structure. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-217008 Summary of the Invention [Problem to be solved by the invention]

[0005] However, honeycomb structures used in exhaust gas purification devices are subjected to loads due to vibration as well as heat from exhaust gases emitted from internal combustion engines such as internal combustion engines. In particular, the durability of honeycomb structures used in vehicle exhaust gas purification devices is easily affected by vibrations during driving. The ceramic structure evaluation device described in Patent Document 1 cannot apply loads due to vibrations, and therefore cannot be said to adequately simulate the environment in which the device is actually used. Furthermore, in order to evaluate durability under vibration loads, a separate vibration test must be performed, which makes it time-consuming to evaluate the durability of honeycomb structures.

[0006] The present invention has been made to solve the above-mentioned problems, and aims to provide an evaluation device and evaluation method for a honeycomb structure that can quickly evaluate the durability of a honeycomb structure when subjected to both thermal and vibration loads. [Means for solving the problem]

[0007] The present inventors have found that the above-mentioned problems can be solved by combining a vibration generator capable of vibrating an accommodation unit in the vertical direction with an exhaust gas generator capable of generating exhaust gas using a predetermined connecting structure and piping, and have thus completed the present invention. That is, the present invention is exemplified as follows.

[0008] <1> a housing portion capable of housing the honeycomb structure; a vibration generator capable of vibrating the accommodation portion in a vertical direction; a connecting structure that connects the accommodation unit and the vibration generator; an exhaust gas generator capable of generating exhaust gas; a pipe connected to the exhaust gas generator and capable of supplying the exhaust gas to the accommodation portion; Equipped with The honeycomb structure evaluation device, wherein the piping is inserted into the connection structure portion and arranged so as not to come into contact with the connection structure portion.

[0009] <2> The connection structure includes a connection jig having a base and an exhaust gas supply port provided on the base, and a box jig connected to the connection jig and capable of accommodating the piping. <1> The honeycomb structure evaluation device according to claim 1,

[0010] <3> the pipe is an elbow pipe, and an insertion structure to be inserted into the exhaust gas supply port is provided at an outlet tip of the elbow pipe; <2> The honeycomb structure evaluation device according to claim 1,

[0011] <4> The difference between the diameter of the exhaust gas supply port and the diameter of the insertion structure is 5.4 to 6.4 mm. <3> The honeycomb structure evaluation device according to claim 1,

[0012] <5> The length of the insertion structure portion inserted into the exhaust gas supply port is 7.6 to 8.4 mm. <3> or <4> The honeycomb structure evaluation device according to claim 1,

[0013] <6> A flexible pipe is provided between the pipe and the exhaust gas generator. <1> ~ <5> 10. The honeycomb structure evaluation device according to claim 9, wherein the honeycomb structure evaluation device is a device for evaluating a honeycomb structure.

[0014] <7> The container includes a sample holder and a cone-shaped jig for connecting the sample holder and the connection structure. <1> ~ <6> 10. The honeycomb structure evaluation device according to claim 9, wherein the honeycomb structure evaluation device is a device for evaluating a honeycomb structure.

[0015] <8> When the inner diameter of the sample holder is L1 and the axial length of the cone-shaped jig is L2, L2 / L1 is 1.3 or more. <7> The honeycomb structure evaluation device according to claim 1,

[0016] <9> The sample holder has flanges at both axial ends, and a guide portion is formed between the flanges. <7> or <8> The honeycomb structure evaluation device according to claim 1,

[0017] <1> ~ <9> a step of accommodating the honeycomb structure in the accommodating portion of any one of the honeycomb structure evaluation devices; supplying the exhaust gas generated by the exhaust gas generator to the accommodation section while vibrating the accommodation section in a vertical direction by the vibration generator; A method for evaluating a honeycomb structure, comprising: [Effects of the Invention]

[0018] According to the present invention, it is possible to provide an apparatus and method for evaluating a honeycomb structure that are capable of quickly evaluating the durability of a honeycomb structure when subjected to both thermal and vibration loads. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a schematic cross-sectional view of an evaluation device for a honeycomb structure according to an embodiment of the present invention. [Figure 2] FIG. 4 is a schematic cross-sectional view of another honeycomb structure evaluation device according to an embodiment of the present invention. [Figure 3] FIG. 2 is a schematic side view of the sample holder 11. [Figure 4] FIG. 2 is a schematic enlarged cross-sectional view of the vicinity of the outlet tip of the elbow pipe. [Figure 5] FIG. 4 is a schematic cross-sectional view of another honeycomb structure evaluation device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] The honeycomb structure evaluation device of the present invention comprises a storage section capable of accommodating a honeycomb structure, a vibration generator capable of vibrating the storage section in a vertical direction, a connection structure connecting the storage section and the vibration generator, an exhaust gas generator capable of generating exhaust gas, and piping connected to the exhaust gas generator and capable of supplying the exhaust gas to the storage section, the piping being inserted into the connection structure and arranged so as not to come into contact with the connection structure. By being configured in this way, the honeycomb structure evaluation device of the present invention can suppress damage to the piping due to vibration and transmission of heat from the exhaust gas flowing through the piping to the vibration generator, and can simultaneously apply loads due to heat and vibration to the honeycomb structure accommodated in the storage section, thereby enabling rapid evaluation of the durability (including thermal shock resistance) of the honeycomb structure when subjected to loads due to both heat and vibration. Therefore, compared to conventional evaluation devices that required separate evaluation of durability under thermal load and evaluation of durability under vibration load, the honeycomb structure evaluation device of the present invention can quickly conduct tests under conditions that simulate the environment in which the honeycomb structure is actually used (in particular, conditions that faithfully simulate the load on the honeycomb structure when driven on an actual road), making it possible to efficiently provide feedback for product development.

[0021] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments, and it should be understood that modifications and improvements made to the following embodiments based on the ordinary knowledge of those skilled in the art without departing from the spirit of the present invention are also within the scope of the present invention.

[0022] <Honeycomb structure evaluation device> The honeycomb structure evaluation device according to the embodiment of the present invention can be suitably used for evaluating the durability of honeycomb structures used in filters (DPF, GPF), catalyst carriers, etc. that constitute exhaust gas purification devices for various vehicles such as automobiles. The material of the honeycomb structure to be evaluated is not particularly limited, and may be ceramic or metal. The shape of the honeycomb structure is not particularly limited, but may have, for example, an outer peripheral wall and partition walls disposed inside the outer peripheral wall to define a plurality of cells that serve as fluid flow paths extending from the first end face to the second end face. Alternatively, the honeycomb structure may be donut-shaped having an outer peripheral wall, an inner peripheral wall, and partition walls disposed between the outer peripheral wall and the inner peripheral wall to define a plurality of cells that serve as fluid flow paths extending from the first end face to the second end face.

[0023] FIG. 1 is a schematic cross-sectional view of an evaluation device for a honeycomb structure according to an embodiment of the present invention. The honeycomb structure evaluation device shown in FIG. 1 includes a storage section 10, a vibration generator 20, a connection structure 30, an exhaust gas generator 40, and a pipe 50. The storage section 10 is a member capable of storing the honeycomb structure 1. The vibration generator 20 is a device capable of vibrating the storage section 10 in the vertical direction. The connection structure 30 is a member that connects the storage section 10 and the vibration generator 20. The exhaust gas generator 40 is a device capable of generating exhaust gas. The pipe 50 is a member that is connected to the exhaust gas generator 40 and can supply exhaust gas to the storage section 10. The pipe 50 is inserted into the connection structure 30 and is arranged so as not to come into contact with the connection structure 30. With this structure, even if the storage section 10 is vibrated in the vertical direction by the vibration generator 20, the vibration can be prevented from being transmitted to the pipe 50 or the exhaust gas generator 40. Therefore, the honeycomb structure 1 accommodated in the accommodation portion 10 can be subjected to loads due to heat and vibration at the same time without affecting the piping 50 or the exhaust gas generator 40 .

[0024] Hereinafter, each component of the honeycomb structure evaluation device will be described in detail.

[0025] (1. Storage section 10) The accommodation portion 10 is not particularly limited as long as it has a structure capable of accommodating the honeycomb structure 1 therein. The storage portion 10 may be composed of a single member as shown in Fig. 1, or may be composed of multiple members. A honeycomb structure in which the storage portion 10 is composed of multiple members is shown in Fig. 2 as an example of an evaluation device. In the honeycomb structure evaluation device shown in Fig. 2, the accommodating section 10 has a sample holder 11 and a cone-shaped jig 12 for connecting between the sample holder 11 and the connection structure section 30. By providing the accommodating section 10 with such a structure, the degree of freedom in designing the accommodating section 10 is improved.

[0026] When the inner diameter of the sample holder 11 is L1 and the axial length of the cone-shaped jig 12 is L2, the ratio L2 / L1 is preferably 1.3 or more, more preferably 1.4 or more, and even more preferably 1.5 or more. This structure ensures the durability of the cone-shaped jig 12. If the ratio L2 / L1 is less than 1.3, the cone-shaped jig 12 is prone to breakage due to vibration. The upper limit of L2 / L1 is not particularly limited, but is preferably 3.0 or less, more preferably 2.8 or less, and even more preferably 2.5 or less.

[0027] The sample holder 11 preferably has flanges 13 at both axial ends, and a guide portion 14 formed between the flanges 13. A schematic side view of the sample holder 11 having such a structure is shown in FIG. The flange 13 of the sample holder 11 is connected to the cone-shaped jig 12 by welding, but vibration can cause cracks in the welded portion. Therefore, by forming the guide portion 14 between the flanges 13 as described above, the flanges 13 can be reinforced. This strengthens the connection between the sample holder 11 and the cone-shaped jig 12, making it less likely that cracks will occur in the welded portion.

[0028] The material of the members constituting the housing portion 10 is not particularly limited, but is preferably a metal from the viewpoint of ease of production, welding, etc. Examples of materials for the members constituting the housing portion 10 include stainless steel, titanium alloy, nickel alloy, copper alloy, aluminum alloy, brass, etc. Among these, stainless steel, particularly SUS304, is preferred because of its high durability, reliability, and low cost.

[0029] (2. Vibration Generator 20) The vibration generator 20 is not particularly limited as long as it is capable of vibrating the housing unit 10 in the vertical direction, and commercially available ones can be used. The vibration generator 20 includes, for example, a vibration generating unit that vibrates the sample stage, an excitation power supply that supplies a DC excitation current to the vibration generating unit, a vibration detector that detects vibrations generated by the vibration generating unit, and a vibration control circuit that supplies an AC drive current to the vibration generating unit in response to the vibrations detected by the vibration detector. The vibration generating unit has an excitation coil and a drive coil that drives the sample stage using the magnetic field generated by the excitation coil. The excitation coil is supplied with a DC excitation current from the excitation power supply, and the drive coil is supplied with an AC drive current from the vibration control circuit. The vibration generator 20 having this configuration can vibrate the housing unit 10 in the vertical direction.

[0030] The vibration generator 20 may be in direct or indirect contact with the connection structure 30. When the vibration generator 20 is in indirect contact with the connection structure 30, a heat insulating member such as a heat shielding plate can be provided between the vibration generator 20 and the connection structure 30. By providing the heat shielding plate, it is possible to prevent the heat of the exhaust gas flowing through the piping 50 from being transferred to the vibration generator 20.

[0031] (3. Connection structure part 30) The connection structure part 30 is a component that connects the accommodation part 10 and the vibration generator 20, and is not particularly limited as long as it has a structure that allows a portion of the piping 50 to be placed within its internal space and does not come into contact with the piping 50. The connection structure 30 may be made up of a single member as shown in FIG. 1, or may be made up of multiple members as shown in FIG.

[0032] In the honeycomb structure evaluation device shown in Fig. 1, the connection structure 30 has an opening 31 for inserting the pipe 50 therein, and an exhaust gas supply port 32. The opening 31 is larger in diameter than the pipe 50, so that the connection structure 30 does not come into contact with the pipe 50 even when it vibrates in the vertical direction. In addition, by providing the exhaust gas supply port 32, the exhaust gas flowing through the pipe 50 can be made to flow into the storage section 10.

[0033] In the honeycomb structure evaluation device shown in FIG. 2 , the connection structure 30 includes a connecting jig 35 having a base 33 and an exhaust gas supply port 34 erected on the base 33, and a box jig 36 connected to the connecting jig 35 and capable of accommodating a pipe 50. The box jig 36 has an opening 37 for inserting the pipe 50 therein and an opening 38 for guiding the pipe to the exhaust gas supply port 34 of the connecting jig 35. By providing the connection structure 30 with such a structure, the degree of freedom in designing the connection structure 30 is improved. Furthermore, because the opening 37 is larger than the diameter of the pipe 50, the connection structure 30 does not come into contact with the pipe 50 even when it vibrates in the vertical direction.

[0034] The material of the members constituting the connection structure 30 (connection jig 35 and box jig 36) is not particularly limited, but is preferably a metal from the viewpoint of manufacturability and ease of welding, etc. Examples of materials for the members constituting the connection structure 30 include stainless steel, titanium alloy, nickel alloy, copper alloy, aluminum alloy, brass, etc. Among these, stainless steel, particularly SUS304, is preferred because of its high durability, reliability, and low cost.

[0035] (4. Exhaust Gas Generator 40) The exhaust gas generator 40 is not particularly limited as long as it is capable of generating exhaust gas, and commercially available ones can be used. The exhaust gas generator 40 includes, for example, a combustion chamber made of a metal material, which has a combustion space for mixing fuel and combustion air and burning the mixture to generate exhaust gas, a combustion air inlet for receiving the combustion air, and an exhaust gas outlet for sending out the generated exhaust gas; a combustion air supply system for supplying the combustion air to the combustion chamber, a combustion air flow rate control means provided in the combustion air supply system for adjusting the flow rate of the combustion air; a main burner for injecting fuel into the combustion chamber, and a pilot burner for igniting the mixture. The exhaust gas generator 40 having such a configuration can stably supply exhaust gas suitable for evaluating the durability (including thermal shock resistance) of the honeycomb structure 1 for a long period of time.

[0036] (5. Piping 50) The piping 50 is not particularly limited as long as it is connected to the exhaust gas generator 40 and is capable of supplying exhaust gas to the housing portion 10 . In the honeycomb structure evaluation device shown in Fig. 1, the outlet tip of the piping 50 is inserted into the exhaust gas supply port 32 of the connection structure part 30. In addition, in the honeycomb structure evaluation device shown in Fig. 2, the outlet tip of the piping 50 is inserted into the exhaust gas supply port 34 of the connection jig 35. By arranging the outlet tip of the piping 50 in this manner, exhaust gas can be supplied to the storage part 10.

[0037] The tubing 50 is preferably an elbow tubing as shown in Figures 1 and 2. The use of an elbow tubing makes it easier to insert the tubing into the connecting structure 30 and position it so as not to come into contact with the connecting structure 30. Here, the term "elbow piping" as used herein refers to a pipe whose direction changes midway. An elbow piping may be formed by connecting two pipes with a joint.

[0038] It is preferable that the pipe 50 (elbow pipe) is provided at its outlet tip with an insertion structure that is inserted into the exhaust gas supply port. An example of a configuration in which such an insertion structure is provided is shown in Fig. 4. Fig. 4 is a schematic enlarged cross-sectional view of the vicinity of the outlet tip of the elbow pipe. In the honeycomb structure evaluation device shown in Fig. 4, a pipe 50 (elbow pipe) has an insertion structure 51 at its outlet tip, which is inserted into the exhaust gas supply port 34. The insertion structure 51 has two protrusions 52, 53 at the tip of the pipe 50. The protrusions 52, 53 do not contact the exhaust gas supply port 34, but are designed so that the exhaust gas supply port 34 is located between them. By providing such an insertion structure 51, it becomes difficult for the exhaust gas that has left the pipe 50 to flow out to the outside, and the exhaust gas can flow efficiently into the storage section 10.

[0039] The difference D3 between the diameter D1 of the exhaust gas supply port 34 and the diameter D2 of the insertion structure 51 (protrusion 52) is preferably 5.4 to 6.4 mm, and more preferably 5.5 to 6.3 mm. With such a difference D3, the above-mentioned effects can be stably obtained and contact between the exhaust gas supply port 34 and the insertion structure 51 due to vibration can be suppressed.

[0040] The length L3 of the insertion structure 51 (protrusion 52) inserted into the exhaust gas supply port 34 is preferably 7.6 to 8.4 mm, and more preferably 7.7 to 8.3 mm. With such a length L3, the above-mentioned effects can be stably obtained, and contact between the exhaust gas supply port 34 and the insertion structure 51 due to vibration can be suppressed.

[0041] In order to prevent the pipe 50 (elbow pipe) from being displaced, a support part 54 as shown in Fig. 2 may be provided. The shape of the support part 54 is not particularly limited as long as it can be connected to the pipe 50, and it may be the same tubular shape as the pipe 50. Support portion 54 may be connected to pipe 50 by welding or the like. Support portion 54 may be placed on support body 60 and fixed thereto. Furthermore, as shown in FIG. 2, if support body 60 also supports pipe 50 on the opening 37 side of box jig 36, displacement of pipe 50 can be stably suppressed. Note that support body 60 is not particularly limited as long as it is connected to a part or portion (such as the ground or a wall) that does not move due to the vibration of vibration generator 20.

[0042] The material of the pipe 50 is not particularly limited, but is preferably a metal from the viewpoint of ease of production, welding, etc. Examples of materials for the pipe 50 include stainless steel, titanium alloy, nickel alloy, copper alloy, aluminum alloy, brass, etc. Among these, stainless steel, particularly SUS304, is preferred because of its high durability, reliability, and low cost.

[0043] A flexible pipe may be provided between the pipe 50 and the exhaust gas generator 40. An example of an evaluation device for a honeycomb structure provided with such a flexible pipe is shown in FIG. In the honeycomb structure evaluation device shown in FIG. 5, a flexible pipe 55 is provided between the pipe 50 and the exhaust gas generator 40 . A plurality of air springs 21 are arranged at the bottom of the vibration generator 20 to reduce vibration to the floor. The height of these air springs 21 is prone to variation, which can cause the vibration generator 20 to tilt slightly. In this case, it is difficult to accurately connect the piping 50 to the exhaust gas generator 40. In contrast, the honeycomb structure evaluation device shown in Figure 5 has a flexible piping 55 provided between the piping 50 and the exhaust gas generator 40, so that even if the vibration generator 20 tilts slightly, the flexible piping 55 can easily connect it to the exhaust gas generator 40.

[0044] The flexible pipe 55 is preferably made of a metal from the viewpoint of ease of manufacture and welding. Examples of materials for the pipe 50 include stainless steel, titanium alloy, nickel alloy, copper alloy, aluminum alloy, and brass. Among these, since the flexible pipe 55 is provided near the exhaust gas generator 40, a nickel alloy (e.g., Inconel 625 (trade name)) having high heat resistance is preferable.

[0045] The honeycomb structure evaluation device of the present invention can be manufactured by preparing the above-mentioned members or devices and assembling them. The connection of the members is not particularly limited and can be performed by a known method (welding, etc.).

[0046] <Method for evaluating honeycomb structures> A method for evaluating a honeycomb structure according to an embodiment of the present invention includes the steps of accommodating a honeycomb structure 1 in the accommodating section 10 of the honeycomb structure evaluation device, and vibrating the accommodating section 10 in the vertical direction using a vibration generator 20 while supplying exhaust gas generated by an exhaust gas generator 40 to the accommodating section 10. The honeycomb structure evaluation method of the present invention uses the above-mentioned honeycomb structure evaluation device, and therefore can quickly evaluate the durability of the honeycomb structure 1 when subjected to both thermal and vibration loads. Therefore, compared to conventional evaluation methods that required separate evaluation of durability when subjected to thermal load and durability when subjected to vibration load, the honeycomb structure evaluation method of the present invention can quickly perform tests under conditions that simulate the environment in which the honeycomb structure 1 is actually used (particularly, conditions that faithfully simulate the load on the honeycomb structure 1 when driven on an actual road), and can efficiently provide feedback to product development.

[0047] The test conditions for this evaluation method are not particularly limited, but the flow rate of the exhaust gas generated by the exhaust gas generator 40 is 1 to 7 Nm 3 / min, and the temperature of the exhaust gas is preferably 100 to 900°C. The vibration generated by the vibration generator 20 has an acceleration of 980 m / s 2 Hereinafter, the frequency is preferably 5 to 500 Hz. [Explanation of symbols]

[0048] 1 Honeycomb structure 10 Storage section 11 Sample holder 12 Cone-shaped jig 13 Flange 14 Guide section 20 Vibration Generator 21 Air spring 30 Connecting structure 31, 37, 38 Openings 32,34 Exhaust gas supply port 33 Base 35 Connection jig 36 Box Jig 40 Exhaust Gas Generator 50 Piping 51 Insertion structure 52,53 Convex part 54 Support part 55 Flexible piping 60 Support

Claims

1. a housing portion capable of housing the honeycomb structure; a vibration generator capable of vibrating the accommodation portion in a vertical direction; a connecting structure that connects the accommodation unit and the vibration generator; an exhaust gas generator capable of generating exhaust gas; a pipe connected to the exhaust gas generator and capable of supplying the exhaust gas to the accommodation portion; Equipped with The honeycomb structure evaluation device, wherein the piping is inserted into the connection structure portion and arranged so as not to come into contact with the connection structure portion.

2. The honeycomb structure evaluation device of claim 1, wherein the connection structure portion comprises a connection jig having a base and an exhaust gas supply port erected on the base, and a box jig connected to the connection jig and capable of accommodating the piping.

3. 3. The honeycomb structure evaluation device according to claim 2, wherein the pipe is an elbow pipe, and an insertion structure to be inserted into the exhaust gas supply port is provided at an outlet tip of the elbow pipe.

4. 4. The honeycomb structure evaluation device according to claim 3, wherein a difference between a diameter of the exhaust gas supply port and a diameter of the insertion structure portion is 5.4 to 6.4 mm.

5. 5. The honeycomb structure evaluation device according to claim 4, wherein the length of the insertion structure portion inserted into the exhaust gas supply port is 7.6 to 8.4 mm.

6. 6. The honeycomb structure evaluation device according to claim 1, wherein a flexible pipe is provided between said pipe and said exhaust gas generator.

7. 6. The honeycomb structure evaluation device according to claim 1, wherein the container portion has a sample holder and a cone-shaped jig for connecting between the sample holder and the connection structure portion.

8. 8. The honeycomb structure evaluation device according to claim 7, wherein L2 / L1 is 1.3 or more, where L1 is an inner diameter of said sample holder and L2 is an axial length of said cone-shaped jig.

9. 8. The honeycomb structure evaluation device according to claim 7, wherein the sample holder has flanges at both axial ends, and a guide portion is formed between the flanges.

10. A step of accommodating a honeycomb structure in the accommodating portion of the honeycomb structure evaluation device according to any one of claims 1 to 5; supplying the exhaust gas generated by the exhaust gas generator to the accommodation section while vibrating the accommodation section in a vertical direction by the vibration generator; A method for evaluating a honeycomb structure, comprising:

Images