Inner chamber cleaning device

Abstract

To provide an inner chamber cleaning device capable of suppressing the occurrence of cracks and holes in a hose.SOLUTION: An inner chamber cleaning device 10 has a hammer head 12 connected to a hose 11 to which gas is supplied and moving within a storage chamber as the gas is ejected and colliding with a removal target, and is provided with a flow path part 14 communicating with a gas ejection port 13 in the hammer head 12. The inner chamber cleaning device comprises an elastic member 25 having a head inner region disposed within the flow path part 14 and a head outer region disposed within the hose 11 outside the flow path part 14 and elastically deforming integrally with the hose 11. The head outer region has a low-flexibility part continuous with the head inner region, and a high-flexibility part continuous with the upstream of the low-flexibility part along the flow of gas within the hose 11 and having a bending elastic modulus smaller than that of the low-flexibility part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an interior cleaning device that cleans items stored in a storage compartment. [Background technology]

[0002] Powdered industrial raw materials such as cement and bauxite, feed, and agricultural products are stored in storage facilities (e.g., silos). These materials can form clumps or form layers on the inner walls of the storage facility due to humidity, moisture contained in the materials, or the load they are subjected to. Therefore, the inside of the storage facility is periodically cleaned to remove these clumps and layers, and a specific example of an apparatus used for this cleaning process is described in, for example, Patent Document 1.

[0003] The device described in Patent Document 1 includes a cleaner head connected to a flexible hose and provided with a nozzle for spraying compressed air sent via the hose. When the cleaner head is placed in a storage container and sprays compressed air from the nozzle, the cleaner head moves within the storage container and collides with clumps or layers of the stored material, pulverizing them.

[0004] The cleaner head is connected to the hose via a cylindrical hose connector connected to the cleaner head. Although Cited Document 1 does not explain how the hose and hose connector are connected, in conventional devices of this type, the hose connector is inserted into the hose and then fixed to the hose using a band or the like to prevent compressed air from leaking from the connection point between the hose and the hose connector. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-188819 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the conventional products mentioned above had the problem that cracks and holes were prone to appearing in the part of the hose corresponding to the upper end of the hose connection (the end that is the longest distance to the cleaner head), which meant that the hose had to be replaced within a short time (for example, 2 or 3 hours) after starting cleaning. The present invention has been made in view of the above circumstances, and has an object to provide an interior cleaning device that can prevent cracks and holes from occurring in the hose. [Means for solving the problem]

[0007] The interior cleaning device of a first invention that meets the above-mentioned objectives has a hammer head to which a hose through which gas is supplied is connected, and which moves inside the storage container as the gas is ejected, thereby colliding with objects to be removed, and the hammer head is provided with a flow path portion that communicates with the gas ejection port, and is equipped with an elastic member having an inner-head region that is arranged inside the flow path portion, and an outer-head region that is arranged inside the hose outside the flow path portion and elastically deforms integrally with the hose, and the outer-head region has a low-flexibility portion that is continuous with the inner-head region, and a high-flexibility portion that is continuous with the low-flexibility portion upstream along the flow of the gas inside the hose and has a bending elastic modulus lower than that of the low-flexibility portion.

[0008] A second invention that meets the above-mentioned objective provides an interior cleaning device that has a hammer head connected to a hose through which gas is supplied and that moves within the storage container as the gas is ejected, thereby colliding with objects to be removed, and the hammer head is provided with a flow path that communicates with the gas ejection port, and is equipped with an elastic member that has an inner-head region that is arranged within the flow path, and an outer-head region that is arranged within the hose outside the flow path and elastically deforms integrally with the hose, and the outer-head region has an elastic modulus decreasing portion in which the bending elastic modulus decreases from the portion that is continuous with the inner-head region toward the upstream side along the flow of the gas in the hose. [Effects of the Invention]

[0009] The interior cleaning device of the first invention comprises an elastic member having an inner head region arranged within the flow path section, and an outer head region arranged within the hose outside the flow path section and elastically deforming together with the hose, and the outer head region has a low flexibility section that is continuous with the inner head region, and a high flexibility section that is continuous with the upstream side of the low flexibility section along the flow of gas in the hose and has a lower bending elastic modulus than the low flexibility section, thereby making it possible to prevent cracks and holes from occurring in the hose.

[0010] The interior cleaning device of the second invention comprises an elastic member having an inner head region arranged within the flow path section, and an outer head region arranged within the hose outside the flow path section and elastically deforming together with the hose, and the outer head region has an elastic modulus decreasing section in which the bending elastic modulus decreases from the part continuous with the inner head region toward the upstream side along the flow of gas in the hose, thereby making it possible to prevent cracks and holes from occurring in the hose. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is an explanatory diagram of an interior cleaning device according to an embodiment of the present invention; [Figure 2] FIG. 4 is an explanatory diagram showing the connection between a hose and a hammer head of the interior cleaning device. [Figure 3] FIG. [Figure 4] FIG. 4 is an explanatory diagram showing the configuration of an elastic member. [Figure 5] 10A and 10B are explanatory diagrams of a sleeve and an elastic member according to a modified example. [Figure 6] 10A and 10B are explanatory diagrams of an elastic member according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0012] Next, embodiments of the present invention will be described with reference to the accompanying drawings to facilitate understanding of the present invention. 1 and 2, an interior cleaning device 10 according to one embodiment of the present invention has a hammer head 12 connected to a hose 11 through which gas is supplied, and which moves within the storage compartment as the gas is ejected to collide with objects to be removed, and the hammer head 12 is provided with a flow path 14 which communicates with a gas ejection port 13. This will be described in detail below.

[0013] Hose 11 has a circular cross section, is flexible, and is made of rubber (note that the material and cross-sectional shape of the hose are not limited to this). The base end of hose 11 is connected to a compressor (not shown) provided in interior cleaning device 10, and gas (air in this embodiment) is sent from the compressor to hose 11. The air sent to hose 11 travels from the base end to the tip end and is sprayed out from the tip end. As shown in Figures 1 and 2, the hammer head 12, which is placed in the storage facility and used, comprises a disk member 16 having a through hole 15 formed in the center into which the tip end of the hose 11 is fitted, a disk member 17 arranged parallel to the disk member 16, and a cylindrical intermediate member 18 provided between the disk members 16 and 17.

[0014] The disk member 17 is located upstream of the disk member 16 along the flow of gas in the hose 11. The disk member 17 has substantially the same shape as the disk member 16, and has a through hole 19 formed in the center, through which the hose 11 is inserted. Hereinafter, unless otherwise specified, the upstream side and the downstream side refer to the upstream side and the downstream side, respectively, along the flow of gas in the hose 11 .

[0015] The intermediate member 18 is fixed to the disk members 16 and 17 by welding or the like. As shown in Figure 2, the intermediate member 18 has a through hole 20 through which the hose 11 is inserted. The through hole 20 has a circular cross section, with a downstream region having a longer radius than the upstream region, and the downstream region is filled with a cured resin 21 outside the hose 11. The cured resin 21 held by the hammer head 12 is adhered to the hose 11, and its movement downstream is restricted by the disc member 16, and its movement upstream is restricted by the intermediate member 18. The cured resin 21 prevents the hose 11 from coming off the hammer head 12.

[0016] 1 and 2, a plurality of vanes 22 are fixed at equal intervals to the outer periphery of intermediate member 18. Each vane 22 is plate-shaped, arranged perpendicular to disk members 16 and 17, and is also fixed to disk members 16 and 17. The plurality of vanes 22 are arranged radially around intermediate member 18, with the center of each vane 22 projecting in a direction away from hose 11. The hammer head 12 having a plurality of blades 22 is suitable for efficiently removing the object to be removed. The shape of the blades 22 is not limited to the above-mentioned shape.

[0017] The parts of the hammer head 12 that come into contact with the object to be removed or the wall surface inside the storage chamber (specifically, the disk members 16, 17, intermediate member 18, and blade body 22) can be made of iron (SS, etc.), copper (beryllium copper, etc.), SUS, or resin. If there is a lot of dust inside the storage chamber, contact between the hammer head 12 and the wall surface inside the storage chamber could generate sparks, which could lead to a dust explosion. Therefore, if there is a lot of dust inside the storage chamber, it is preferable that the relevant parts of the hammer head 12 be made of beryllium copper or resin.

[0018] Fixtures 23 and 24 are attached to the hose 11 at a portion located upstream of the disc member 17 and a portion disposed in the downstream region of the through-hole 20, respectively. In this embodiment, metal hose clamps are used as the fixtures 23 and 24 (but this is not limiting). Fixture 23 restricts the hammer head 12 from moving upstream relative to the hose 11, and fixation device 24 restricts the hammer head 12 from moving downstream relative to the hose 11.

[0019] 2, in this embodiment, the outlet 13 is formed by the downstream end of the through hole 15 of the disk member 16 and the tip end of the hose 11, and the flow path portion 14 is formed by a region of the hose 11 that is disposed within the hammer head 12. However, this is not limited to this. For example, the tip end of the hose 11 may be disposed at the same position along the flow of gas within the hose 11 as the contact position between the intermediate member 18 and the disk member 16. In this case, the outlet 13 is formed only by the downstream end of the through hole 15 of the disk member 16, and the flow path portion 14 is formed by the region that is disposed within the hammer head 12 of the hose 11 and the part of the through hole 15 of the disk member 16 excluding the downstream end that functions as the outlet 18.

[0020] 2 and 3, an elastic member 25 is disposed inside hose 11 within a predetermined range from the tip end toward the upstream side. As shown in Fig. 3, elastic member 25 includes an in-head region 26 disposed within flow path portion 14 (inside hammer head 12), and an out-head region 27 disposed within hose 11 outside flow path portion 14 (outside hammer head 12). Fixing devices 23 and 24 also serve to fix elastic member 25 and hose 11 together.

[0021] In this embodiment, elastic member 25 is formed by two coil springs 28, 29 fitted together so that their axes overlap, as shown in Fig. 4. That is, elastic member 25 has two coil springs 28, 29. Coil springs 28, 29 are each aligned along the longitudinal direction of hose 11. Coil spring 28 has a constant spring pitch and wire diameter (the diameter of the linear member itself that forms the coil spring) (equal at any position in the longitudinal direction), and the same is true for coil spring 29.

[0022] Coil spring 28 is longer than coil spring 29, and elastic member 25 is arranged such that the downstream ends of coil springs 28, 29 are located at substantially the same position in the longitudinal direction of elastic member 25. Therefore, elastic member 25 is mainly composed of coil springs 28, 29 from the downstream end to the length of coil spring 29, and the remainder is mainly composed of only coil spring 28. Note that the downstream ends of coil springs 28, 29 may be located at different positions in the longitudinal direction of elastic member 25.

[0023] 3, the portion of the elastic member 25 that is mainly made up of the coil springs 28, 29 corresponds to the combined region of the entire head inside region 26 and part or most of the head outside region 27, and the portion that is mainly made up of only the coil spring 28 (the portion where the coil spring 29 does not overlap with the coil spring 28) corresponds to the remaining region of the head outside region 27. In the above explanation, the word "mainly" is used, as in "mainly the coil springs 28, 29" and "mainly only the coil spring 28," because the elastic member 25 may have something other than the coil springs 28, 29, for example, an adhesive that bonds the coil springs 28, 29 to each other.

[0024] In this embodiment, in the head outer region 27, the portion mainly formed by the coil springs 28, 29 corresponds to the low flexibility section 30 that continues to the head inner region 26. The portion mainly formed only by the coil spring 28 corresponds to the high flexibility section 31 that continues upstream of the low flexibility section 30 and has a lower bending modulus than the low flexibility section 30. The lengths of the low flexibility section 30 and the high flexibility section 31 are both, for example, 50 mm or more and 1000 mm or less.

[0025] Therefore, the number of overlaps of the coil spring in the highly flexible portion 31 (one in this embodiment) is smaller than the number of overlaps of the coil spring in the low flexible portion 30 (two in this embodiment). Therefore, the highly flexible portion 31 has a smaller bending modulus than the low flexible portion 30, and is more likely to bend (distort).

[0026] Furthermore, when air is ejected from the nozzle 13, the hammer head 12 moves due to the ejection of air according to the law of action and reaction, and as a result, the hose 11 bends. The portion of the hose 11 corresponding to the out-of-head region 27 is no exception to this rule; as the hammer head 12 moves, the portion of the hose 11 corresponding to the out-of-head region 27 (the portion located outside the out-of-head region 27) bends together with the out-of-head region 27. In other words, the out-of-head region 27 elastically deforms together with the hose 11. In this embodiment, the hammer head 12 and the like are designed so that the inner head region 26 and the corresponding region of the hose 11 do not bend substantially.

[0027] Here, various verifications have confirmed that by providing a low flexibility section 30 in the outer head region 27 of the elastic member 25 having the inner head region 26, as in this embodiment, which is continuous with the inner head region 26, and by providing a high flexibility section 31 in the upstream side of the low flexibility section 30, it is possible to prevent cracks and holes from occurring in the hose 11 due to the cleaning process inside the storage facility caused by the movement of the hammer head 12.

[0028] The material of the coil springs 28, 29 can be selected from SWOSC-B, SWOC-B, SWOC-V, SWP-A, etc., but is not particularly limited. The material and wire diameter of the coil springs 28, 29 are determined appropriately depending on the weight of the hammer head 12, etc. In this embodiment, the elastic member 25 has the same outer diameter at different positions along the gas flow, but the outer diameter of the entire head outer region 27 or a part of it (for example, the region nearby, including the upstream end) may be gradually reduced as it moves upstream.

[0029] 5, a cylindrical sleeve 37 may be attached to the hose 11 to protect the area near the hammer head 12, which may collide with the wall surface of the storage facility for the hose 11 or the object to be removed, as well as the fixing device 23, which may have the same problem. The sleeve 37 may be made of resin or rubber, and the hose 11 is attached to the hose 11 with the hose 11 passing through the sleeve 37. In FIG. 5, the same components as those shown in FIG. 2 are denoted by the same reference numerals.

[0030] The sleeve 37 may be fixed to the hose 11, but does not need to be fixed. This is because the sleeve 37 is disposed at or near a position where it comes into contact with the hammer head 12 due to centrifugal force during the cleaning process inside the storage facility. The length of the sleeve 37 in the longitudinal direction (along the hose 11) is not particularly limited, and can be, for example, equal to or shorter than the out-of-head region 27.

[0031] In the example shown in FIG. 5, the downstream end of the hose 11 and the downstream end of the elastic member 25 are located inside the intermediate member 18 (that is, on the upstream side of the outlet 13). The coil spring 28 is processed so that the downstream end (an example of portion L) of the coil spring 28 is positioned at a longer distance to the axis of the coil spring 28 compared to the region excluding the downstream end, and when viewed in the longitudinal direction of the hose 11, the downstream end of the coil spring 28 is positioned inside the downstream region of the through hole 20 of the intermediate portion 18 and outside the upstream region which has a shorter radius than the downstream region of the through hole 20.

[0032] By processing the coil spring 28 in this manner, even if the elastic member 25 moves upstream together with the hose 11 relative to the hammer head 12, the downstream end of the coil spring 28 can be prevented from entering the upstream region from the downstream region of the through-hole 20. As a result, the elastic member 25, i.e., the coil springs 28, 29, are prevented from coming off the hammer head 12.

[0033] In this example, the above-mentioned processing is performed only on the coil spring 28, but the processing may be performed only on the coil spring 29, or on both the coil springs 28 and 29. Furthermore, in the coil spring 28, the portion L that is machined so as to be positioned at a long distance from the axial center of the coil spring 28 is not limited to the downstream end. The same applies when machining the coil spring 29. However, it is preferable to machine the coil springs 28 and 29 in this manner, since this makes machining easier.

[0034] In this embodiment, the spring pitch and wire diameter of coil spring 28 are equal to the spring pitch and wire diameter of coil spring 29, but the elastic member may be constructed using two coil springs having different spring pitches and / or wire diameters. The elastic member may be configured using three or more coil springs, or may be configured using one coil spring.

[0035] When three or more coil springs are used, the coil springs may be stacked so that, for example, the number of overlaps of the coil springs in the high flexibility section is less than the number of overlaps of the coil springs in the low flexibility section. When one coil spring is used, for example, the bending modulus of elasticity of the high flexibility section can be made smaller than that of the low flexibility section by making the spring pitch of the coil spring in the high flexibility section larger (wider) than that of the coil spring in the low flexibility section, or by making the wire diameter of the coil spring in the high flexibility section shorter (smaller) than that of the coil spring in the low flexibility section.

[0036] In addition, making the spring pitch of the coil spring in the high flexibility section larger than the spring pitch of the coil spring in the low flexibility section, or making the wire diameter of the coil spring in the high flexibility section shorter than the wire diameter of the coil spring in the low flexibility section may be done for an elastic member having multiple coil springs. The elastic member need only have an inner head region and an outer head region having a low flexibility portion and a high flexibility portion, and does not have to have a coil spring. For example, the elastic member can be made of a rubber piece or a fibrous molded body.

[0037] When using a cylindrical rubber piece, a thick and thin region may be provided in the outer region of the head, and these regions may be designated as a low flexibility portion and a high flexibility portion, respectively. Alternatively, a region made of a material with a high flexural modulus and a region made of a material with a low flexural modulus may be provided, and these regions may be designated as a low flexibility portion and a high flexibility portion, respectively.

[0038] Furthermore, as shown in Fig. 6, a slit 34 may be made in a certain range from one end (upstream end) of a cylindrical rubber piece 33, with the area with the slit 34 being a high flexibility section 35 and the area without the slit 34 being a low flexibility section 36. In the example of Fig. 5, the slit 34 is spiral-shaped, but it goes without saying that this is not limiting. The details explained regarding these rubber pieces can also be applied to fibrous molded bodies.

[0039] Alternatively, instead of designing the outer-head region to have a low-flexibility portion and a high-flexibility portion, the outer-head region may be designed to have a reduced-elasticity portion in which the flexural modulus decreases from the downstream end (i.e., the portion continuous with the inner-head region) toward the upstream side. The length of the reduced-elasticity portion is, for example, 50 mm or more and 1000 mm or less.

[0040] Here, the elastic modulus decreasing section may have, in order upstream, a region A with a constant flexural modulus and a region B with a flexural modulus that gradually decreases upstream (however, the flexural modulus of the downstream end of region B, which has the highest flexural modulus, is equal to or less than that of region A), or the entire elastic modulus decreasing section may be designed so that the flexural modulus gradually decreases upstream. For example, the flexural modulus can be gradually decreased by gradually increasing the spring pitch of the coil spring or by gradually shortening (reducing) the wire diameter of the coil spring. [Example]

[0041] Next, an experiment conducted to confirm the effects of the present invention will be described. A hammer head with a flow path of 120 mm (it goes without saying that the present invention is not limited to hammer heads with a flow path of 120 mm) was prepared, and a hose with an elastic member (any one of Examples 1 to 11 and Comparative Examples 2 to 6) fitted into the flow path of the hammer head was inserted and fixed together with the elastic member, and the hose and elastic member were fixed with a stainless steel band.The hammer head was then placed in a silo containing limestone powder, and a cleaning process was performed in which the solidified limestone powder inside the silo was crushed by blowing air from the hammer head, and its crushability and durability were tested.

[0042] In Comparative Example 1 only, a hose was attached to the part of the bamboo nipple protruding from the hammer head, with part of the nipple fitted into the flow path, and the hose was fixed to the bamboo nipple with a stainless steel band (i.e., the hose was not inserted into the flow path). The experimental results are shown in Tables 1, 2 and 3.

[0043] [Table 1]

[0044] [Table 2]

[0045] [Table 3]

[0046] In Tables 1 to 3, for examples or comparative examples in which the elastic member is composed of two elastic pieces, the respective elastic pieces are described as elastic piece A and elastic piece B, and for examples or comparative examples in which the elastic member is composed of one elastic piece, the elastic piece is described as elastic piece A.

[0047] In Examples 1 to 4, 8, and 9, where the elastic member was composed of two coil springs, the two coil springs were fitted together so that their downstream ends were positioned at the same longitudinal position and their axes overlapped. In Example 7, a conical spring (elastic piece B) with a bending modulus smaller than that of the coil spring (elastic piece A) was connected to the upstream end of the coil spring positioned downstream and arranged in series.

[0048] The rubber hose of Example 10 was the same as that of Comparative Example 5, but with a spiral cut made in it, in a region 50 mm from the upstream end of the rubber hose. The fibrous cylinders of both Comparative Example 6 and Example 11 were made by laminating Kevlar fabric with an adhesive and molding it into a cylindrical shape. Only the fibrous cylinder of Example 11 had a longitudinal slit formed in a region 150 mm from the upstream end of the cylindrical molding.

[0049] In Tables 1, 2 and 3, "friability" was evaluated on a five-point scale of A, B, C, D and E, with A being the highest (strongest) friability rating and E being the lowest (weakest) friability rating. In the table, "durability" is the result of measuring the time from the start of the cleaning process until cracks or holes form in the hose (hereinafter referred to as "durability time"), and the measurement results are shown on a five-level scale: A, B, C, D, and E. The specific durability times for each rating are: A = 20 hours or more, B = 10 hours or more but less than 20 hours, C = 5 hours or more but less than 10 hours, D = 2 hours or more but less than 5 hours, and E = less than 2 hours.

[0050] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions that do not depart from the gist of the present invention are within the scope of application of the present invention. For example, the hose does not need to be inserted into the flow passage portion, but may be connected to the outer head region of the elastic member.

[0051] Furthermore, when the elastic member has a low flexibility portion and a high flexibility portion, the elastic member may have a region upstream of the high flexibility portion that has a bending modulus greater than that of the high flexibility portion.When the elastic member has a modulus-reducing portion, the elastic member may have a region upstream of the modulus-reducing portion that has a bending modulus greater than the maximum modulus of bending in the modulus-reducing portion.

[0052] The flexural modulus of the elastic member in the head inner region may be lower than the flexural modulus of the head outer region (if the head outer region has a low flexibility portion and a high flexibility portion, the flexural modulus of the high flexibility portion). Furthermore, the head inner region, the low flexibility portion, and the high flexibility portion may be formed from different materials. The shape of the hammer head is not particularly limited, and for example, the hammer head does not have to have blades or hardened resin. Furthermore, the diameter (width) of the flow path portion may be the same at any position along the gas flow. [Explanation of symbols]

[0053] 10: interior cleaning device, 11: hose, 12: hammer head, 13: outlet, 14: flow path, 15: through hole, 16, 17: disc member, 18: intermediate member, 19, 20: through hole, 21: hardened resin, 22: blade body, 23, 24: fixing member, 25: elastic member, 26: head inner region, 27: head outer region, 28, 29: coil spring, 30: low flexibility portion, 31: high flexibility portion, 33: rubber piece, 34: notch, 35: high flexibility portion, 36: low flexibility portion, 37: sleeve

Claims

1. A hose to which gas is supplied is connected, and a hammer head is provided which moves within the storage cabinet by the ejection of the gas and hits the object to be removed, and the hammer head is provided with a flow path portion which communicates with the gas ejection port. an elastic member having an inner-head region disposed within the flow path section, and an outer-head region disposed within the hose outside the flow path section and elastically deforming integrally with the hose, wherein the outer-head region has a low-flexibility section continuous with the inner-head region, and a high-flexibility section continuous with the inner-head region upstream of the low-flexibility section along the flow of the gas in the hose, the high-flexibility section having a bending elastic modulus lower than that of the low-flexibility section.

2. 2. The interior cleaning device according to claim 1, wherein the elastic member comprises one or more coil springs.

3. The interior cleaning device according to claim 2, characterized in that there are a plurality of the coil springs, the plurality of coil springs are fitted together so that their axial centers overlap, and the number of overlaps of the coil springs in the high flexibility portion is less than the number of overlaps of the coil springs in the low flexibility portion.

4. 3. The interior cleaning device according to claim 2, wherein the spring pitch of the coil spring in the elastic member is greater in the highly flexible portion than in the less flexible portion.

5. 3. The interior cleaning device according to claim 2, wherein the elastic member has a wire diameter of the coil spring that is shorter in the highly flexible portion than in the less flexible portion.

6. 3. The interior cleaning device according to claim 2, wherein the coil spring is prevented from coming off the hammer head by arranging a portion L of the coil spring at a position where the distance to the axis of the coil spring is longer than that of an area other than the portion L.

7. 2. The interior cleaning device according to claim 1, wherein the elastic member comprises a rubber piece.

8. 2. The interior cleaning device according to claim 1, wherein the elastic member comprises a fibrous molded body.

9. A hose to which gas is supplied is connected, and a hammer head is provided which moves within the storage cabinet by the ejection of the gas and hits the object to be removed, and the hammer head is provided with a flow path portion which communicates with the gas ejection port. an elastic member having an inner-head region disposed within the flow path section, and an outer-head region disposed within the hose outside the flow path section and elastically deforming integrally with the hose, wherein the outer-head region has an elastic modulus decreasing section in which the bending elastic modulus decreases from a portion continuous with the inner-head region toward the upstream side along the flow of the gas in the hose.

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