Soundproof box for work equipment

Abstract

To prevent ingress of rain water through a gap between an upper surface of a flange provided at a base and a lower end edge of a soundproof case.SOLUTION: A bracket 21 is attached to an outer surface of a side wall 12 of a base 10 by means, such as intermittent fillet welding performed at predetermined intervals, so as to protrude in a horizontal direction farther than a predetermined height position of the side wall 12. Further, a portion, which is located above an attachment position of the bracket 21, of the side wall 12 of the base 10 is formed as a water stop 22 which prevents ingress of rain water from a gap Δ between the bracket 21 and a lower end edge of a soundproof case 30. In the structure, the water stop 22 is formed by a part of the side wall 12 of the base 10 to achieve water tightness without filling the gap with a sealant etc. Further, since a gap δ exists between the outer surface of the side wall 12 of the base 10 and the bracket 21, rain water on the bracket 21 flows through the gap δ to prevent rain water from accumulating on the bracket 21.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a soundproof box for housing working machines such as compressors and generators, and more specifically, to the structure of a soundproof box for working machines that has excellent waterproof properties. [Background technology]

[0002] Work machines such as compressors and generators are usually configured as soundproof work machines that are packaged by housing the component equipment in a soundproof box to prevent noise from escaping outside the machine during operation and to make transportation and installation easier.

[0003] An example of the construction of a soundproof box 100 for such a soundproof working machine is shown in FIG.

[0004] The soundproof box 100 shown in Figure 7 is composed of a base 110 formed into a rectangular frame shape when viewed from above, and a soundproof case 130 consisting of a front panel 131, a rear panel 132, a side panel 133, and a top panel 134.A soundproof work machine is formed by covering the upper part of the base 110, on which the components of the work machine are placed, with the soundproof case 130.A window 135 is provided by opening a part of the side panel 133, and a door 136 is provided to open and close this window 135, allowing maintenance, inspection, etc. of the equipment housed inside to be performed.

[0005] Because soundproof work machines packaged in this soundproof box 100 are easy to transport and install, as mentioned above, they are often used outdoors at construction sites, civil engineering work sites, and the like. Therefore, the soundproof box 100 is required to not only have soundproofing and noise-blocking properties to block out the operating noise of the equipment contained therein, but also to be waterproof to protect the equipment contained inside from rainwater, etc.

[0006] In particular, in the soundproof box 100 in which an oil storage tank 117 for storing leaked oil is provided within the aforementioned base 110 so as to prevent fuel, lubricating oil, etc. leaking from the stored equipment from leaking outside the aircraft, and the base 110 functions as an oil barrier, if rainwater accumulates in the oil storage tank 117, the accumulated rainwater will mix with the leaked oil in the oil storage tank 117 and become contaminated, making it impossible to treat it as wastewater, which will result in disposal costs being incurred for disposing of the accumulated rainwater.

[0007] Furthermore, if rainwater accumulates in the oil storage tank 117, in the event of a leak of fuel, lubricating oil, etc., the oil storage tank 117 will not have the capacity to accommodate the leaked oil, and the leaked oil may overflow from the oil storage tank 117 and pollute the surrounding environment.

[0008] Therefore, in the soundproof box 1 in which an oil storage tank 117 is provided as described above and the base 110 functions as an oil barrier, it is necessary to adopt a waterproof structure that can prevent rainwater from entering the oil storage tank 117.

[0009] Here, in the conventional soundproof box 100 shown in Figures 7 and 8, four channel materials 111 with a U-shaped cross section are welded or connected by other means so as to form a rectangular frame when viewed in a plane, to form the aforementioned base 110, and in the example shown, this base 110 is configured to house an oil storage tank 117, which is a box-shaped container opening upwards, so that the aforementioned leaked oil can be stored within the base 110.

[0010] The web portion of the channel material 111 forms the side wall 112 of the base 110, and a water stop 122 is erected on a flange 111a of the channel material 111 protruding outward from the upper edge of the base 110. The part of the flange 111a that is on the outer side of the aircraft than the water stop 122 serves as a bracket 121 for mounting and fixing the lower edge of the soundproof case 130 (the lower edges of the front panel 131, rear panel 132, and side panel 133). This prevents rainwater that has seeped in through the gap Δ between the lower edge of the soundproof case 130 and the upper surface of the bracket 121 from passing over the water stop 122 and further infiltrating into the aircraft interior and accumulating in the oil storage tank 117 (see Figure 5, paragraphs

[0070] to

[0072] of Patent Document 1). [Prior art documents] [Patent documents]

[0011] [Patent Document 1] JP 2018-131928 A Summary of the Invention [Problem to be solved by the invention]

[0012] In a configuration in which the above-mentioned water stop 122 is attached to the flange 111a provided at the upper end of the base 110, even if rainwater infiltrates into the gap Δ (see Figures 7 and 8) between the upper surface of the flange 111a (bracket 121) and the lower edge of the soundproof case 130, the rainwater is blocked by the water stop 122 and cannot penetrate any further into the soundproof box 100, thereby preventing the rainwater from accumulating in the oil tank 117.

[0013] However, if one tries to prevent rainwater from entering through the gap Δ by installing the water stop 122 described above, the following problems may arise.

[0014] As shown in Figures 8 and 9, the above-mentioned water stop plate 122 is attached by welding the water stop plate 122, which is made of a metal strip, to the upper surface of the flange 111a protruding outward from the upper edge of the base 110.

[0015] This attachment by welding is performed by standing the water stop 122 on the flange 111a so that one long side is in contact with the surface of the flange 111a, and then using intermittent fillet welding at a specified interval to one of the corners Cb, Cb' (see Figure 9(A)) formed by the upper surface of the flange 111a and the water stop 122 (in the illustrated example, the corner Cb' on the inside side of the aircraft), as shown in Figure 8, where the position of the weld bead 123 is shown.

[0016] Therefore, since the upper surface of the flange 111a and the water stop 122 are only joined at the welded parts, and a gap δ' still exists in other parts, even if the water stop 122 is simply welded using the method described above, rainwater will still be able to penetrate through this gap δ' to the inside of the soundproof box 100 beyond the water stop 122 (see Figure 9 (B)).

[0017] Due to this structure, in the conventional soundproof box 100, after the water stop 122 is attached to the upper surface of the flange 111a by welding, the other of the corners Cb, Cb' formed at the joint between the flange 111a and the water stop 122 (in the illustrated example, the corner Cb on the outside of the machine) is filled with a sealing material 125 such as silicone resin to provide watertightness (see Figure 9(A)).

[0018] Therefore, when installing the waterstop 122 using this method, in addition to the welding work to fix the waterstop 122, the work of filling with sealing material 125 to make it watertight is required, which requires a lot of labor and makes the installation work of the waterstop 122 complicated.

[0019] Furthermore, with this method, if the gap δ' is not completely filled due to insufficient filling of the sealing material 125, sufficient watertightness will not be obtained and rainwater will be allowed to penetrate. Also, even if the sealing material 125 is properly filled and watertightness is obtained when the soundproof box 100 is shipped, if the sealing material 125 peels off or floats over time, the waterproofness will be lost and rainwater may penetrate.

[0020] Furthermore, since the corner Cb on the outside of the machine formed by the upper surface of the flange 111a and the water stop plate 122 is filled with sealing material 125, when placing another part (in the example of Figure 8, the lower edge of the door 136 provided on the side panel 133) on the flange 111a (bracket 121), it is necessary to position it in a position that does not interfere with this sealing material 125.

[0021] In order to omit the step of filling such sealing material 125, it is also possible to use continuous fillet welding instead of the intermittent fillet welding at the predetermined intervals described above when installing the waterstop 122, and fill the gap δ' between the flange 111a and the waterstop 122 by welding.

[0022] However, when performing continuous fillet welding, the water stop 122 must first be temporarily attached to the upper surface of the flange 111a by spot welding, and then the actual welding must be performed by continuous fillet welding, which significantly increases the amount of work required for the welding operation.

[0023] Furthermore, compared to intermittent fillet welding, in which welding is performed intermittently at specified intervals, continuous fillet welding is a technically difficult task, and therefore, when installing a waterstop using this method, it becomes necessary to secure experienced welders, which is a factor that increases the manufacturing costs of the soundproof box 100.

[0024] Furthermore, when the lower edge of the waterstop 122 is fillet welded continuously along its entire length, the heat generated during welding causes distortion in the waterstop 122 and the flange 111a, and therefore additional work must be carried out to remove distortion in the waterstop 122 and the flange 111a after the welding work.

[0025] Therefore, even if the work of filling the sealing material 125 could be omitted by changing the welding method for installing the water stop 122 from intermittent fillet welding to continuous fillet welding, such a change in the welding method would create many new problems as mentioned above, and therefore cannot be adopted in reality.

[0026] Therefore, the present invention has been made to eliminate the drawbacks of the above-mentioned conventional technology, and has as its first object to provide a soundproof box for a work machine which is configured to prevent the intrusion of rainwater through the gap Δ between the upper surface of the flange on the base and the lower edge of the soundproof case, while also having a structure which allows the above-mentioned bracket and water stop plate to be installed on the upper end of the base through relatively simple work.

[0027] In order to enable the soundproof work machine to be suspended by a crane or the like, a gate-shaped suspension device 140 is provided on the soundproof box 100 of the work machine as shown in Figure 10, and each of the lower ends 141, 141 of this suspension device 140 is attached to a bracket 121 (flange 111a) provided on the base 110 by means of bolts or the like.

[0028] In contrast, when reviewing the structure of the brackets and water stop plates attached to the upper end of the base in order to improve waterproofing as mentioned above, the structure of the mounting parts of the lower ends 141, 141 of the hanging device 140 must also be reviewed to obtain the strength necessary for hanging soundproof work machines.

[0029] Therefore, a second object of the present invention is to provide a soundproof box for a work machine equipped with a lower end mounting structure for a hanging device, which has the strength to enable the soundproof work machine to be safely suspended by a crane, etc., even if structural changes are made to the aforementioned brackets and water stops provided at the upper end of the base. [Means for solving the problem]

[0030] The means for solving the problems are described below together with the reference numerals used in the description of the embodiment of the invention. The reference numerals are used to clarify the correspondence between the description of the claims and the description of the embodiment of the invention, and needless to say, are not used to restrict the interpretation of the technical scope of the present invention.

[0031] In order to achieve the above object, the soundproof box 1 of the working machine of the present invention is, In the soundproof box 1 of the work machine, which is composed of a base 10 formed in a rectangular frame shape in a plan view on which the components of the work machine are placed, and a soundproof case 30 covering the base 10, The lower edge of the soundproof case is placed on the outer surface of the side wall 12 so that it protrudes horizontally from a predetermined lower position than the upper edge of the side wall 12 of the base 10. Metal Bracket 21 By intermittent welding attachment A gap is formed between the outer surface of the side wall excluding the welded portion and the bracket. At the same time, The side wall 12 of the base 10 has a portion located above the mounting position of the bracket 21, which portion is configured as a water stop plate 22 (Claim 1).

[0032] The bracket 21 is formed of a metal strip, The corner portion Ca formed by the bottom surface of the bracket 21 and the outer surface of the side wall 12 of the base 10, As the intermittent welding The bracket 21 may be attached to the side wall 12 of the base 10 by performing intermittent fillet welding (claim 2: see FIG. 4).

[0033] The bracket 21 is made of a metal angle bar having an L-shaped cross section. One piece of the angle iron is brought into surface contact with the outer surface of the side wall 12 with the other piece facing upward, and the one piece of the angle iron is spot welded, plug welded, or slot welded to the outer surface of the side wall 12 (the example shown is plug welded). The intermittent welding is performed by The bracket 21 may be attached to the side wall 12 of the base 10 (claim 3: see FIG. 5).

[0034] Furthermore, a gate-shaped hanging device 40 is provided between both ends of the width direction of the base 10, and fixed pieces 51, 51 are fixed to the side wall 12 of the base 10 and have an upper portion protruding above the upper edge of the water stop plate 22. The bottoms 42, 42 at the lower ends of the hanging fixtures 40 are fixed to the upper surface of the bracket 21 by means of bolts or the like. Each side 43, 43 of the hanging device 40 may be fixed to the outer surface of the fixing pieces 51, 51 which are fixed to the inner surface of the side wall 12 of the base 10 and protrude above the upper edge of the waterstop 22 by means of bolts or the like (Claim 4: see Figures 1 and 6). Effect of the Invention

[0035] With the configuration of the present invention described above, the soundproof box 1 for the work machine of the present invention can provide the following remarkable effects.

[0036] The bracket 21 is attached to the outer surface of the side wall 12 of the base 10 so as to protrude horizontally from a predetermined height position of the side wall 12, and the portion of the side wall 12 of the base 10 that is located above the mounting position of the bracket 21 is used as the water stop plate 22.This makes it possible to prevent rainwater from entering the interior of the machine through the gap Δ between the base 10 and the soundproof case 30 of the soundproof box 1 without filling it with a sealing material made of silicone resin or the like.

[0037] In other words, rainwater attempting to penetrate into the inside of the soundproofing box 1 through the gap Δ between the upper surface of the bracket 21 and the lower edge of the soundproofing case 30 is prevented from penetrating into the inside of the soundproofing box 1 by the water stop plate 22.

[0038] This water stop 22 is formed from a part of the side wall 12 of the base 10 and is formed integrally with the side wall 12 without any seams or joints, so that the water stop 22 can be made watertight without filling it with a sealing material, as in the structure described as the prior art.

[0039] The outer surface of the side wall 12 of the base 10 and the bracket 21 can be attached by various means. As an example, when this is done by intermittent welding, a gap δ exists. However, rainwater that seeps in between the upper surface of the bracket 21 and the lower edge of the soundproof case 30 flows down along the outer surface of the side wall 12 of the base 10 through this gap δ, thereby preventing rainwater from accumulating on the bracket 21.

[0040] Furthermore, with the above-mentioned configuration of the present invention, the corner Ca' formed by the bracket 21 and the water stop plate 22 is not filled with sealant, so there is no need to avoid interference with the sealant when placing other components (e.g., the lower edge of the side panel 33) on the bracket 21, thereby increasing design freedom.

[0041] When the bracket 21 is formed from a metal strip and intermittent fillet welding is performed on the corner Ca formed by the bottom surface of the bracket 21 and the outer surface of the side wall 12 of the base 10, or when the bracket 21 is formed from an angle iron with an L-shaped cross section and one piece of the angle iron is brought into face-to-face contact with the outer surface of the side wall of the base and spot welded, plug welded, or slot welded to the outer surface of the side wall 12, no bulge of a weld bead is formed on the upper surface of the bracket 21, and interference between the weld bead and a member placed on the bracket 21 (e.g., the side panel 33) can be avoided.

[0042] As mentioned above, in the soundproof box 1 of the present invention, the bracket 21 is attached to the outer surface of the side wall 12 of the base 10 by means such as intermittent welding, and therefore the strength of the bracket 21 is reduced compared to soundproof boxes of the conventional structure in which the bracket is formed integrally with the side wall of the base.

[0043] As a result, simply fixing each of the lower ends of the gate-shaped hanging device 40 used to suspend the soundproof box 1 with a crane or the like to the bracket 21 is not enough to support the load when suspended.

[0044] In contrast to this, in the configuration of the present invention, in which the side 43 of the hanging device 40 is fixed not only to the bracket 21 but also to the fixed piece 51 fixed to the side wall 12 of the base 10 by bolting or the like, the joint of the hanging device 40 can be given strength sufficient to withstand hanging by a crane or the like. [Brief description of the drawings]

[0045] [Figure 1]1 is a schematic perspective view of a soundproof box of the present invention (with part of the top panel, the rear panel, and one of the side panels removed). [Diagram 2] A cross-sectional view of the main part taken along line II-II in Figure 1. [Diagram 3] FIG. 2A is an exploded enlarged perspective view of the part indicated by the arrow III in FIG. 1, and FIG. 2B is an enlarged perspective view. [Figure 4] An explanatory diagram of the structure of the upper end of the base (an example of a bracket formed from a band plate). [Diagram 5] An explanatory diagram of the structure of the upper end of the base (an example of a bracket formed using angle iron). [Figure 6] FIG. [Figure 7] Side view of a soundproof box (conventional). [Figure 8] Cross-sectional view of the main parts of a soundproof box (conventional). [Figure 9] An explanatory diagram of the structure of the upper end of the base (conventional). [Figure 10] An explanatory diagram of the mounting structure of a hanging device (conventional). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0046] The soundproof box for a work machine according to the present invention will be described below with reference to the attached drawings.

[0047] The symbol 1 in Figure 1 denotes a soundproof box of the present invention, which is composed of a base 10 that is rectangular in plan view on which the equipment that constitutes the work machine is placed, and a soundproof case 30 that covers the upper part of the base 10 on which the component equipment is placed.

[0048] Of these, the soundproof case 30 has sides formed by a front panel 31, a rear panel 32, and a side panel 33, and is equipped with a top panel 34 that covers the upper part of the space enclosed by these.By placing this soundproof case 30 on the base 10, a storage space is formed within the soundproof case 30 to house the component equipment placed on the base 10.

[0049] In the soundproof box 1 in Figure 1, the front panel 31, the side panel 33 on the front side of the page, and part of the top panel 34 are removed. When these parts are attached, the overall shape of the box is a rectangular parallelepiped box, as shown by the dashed lines in Figure 1. The basic structure of the soundproof box 1 is the same as that of the conventional soundproof box described with reference to Figure 7.

[0050] The aforementioned base 10 is formed by welding four plate materials 11 or assembling them by other means into a rectangular frame shape when viewed from above. In this embodiment, as shown in Figure 2, plate materials 11 with an L-shaped cross section, one side of which is bent at a specified width, are used as the aforementioned plate materials 11. By combining four of the plate materials 11 upright with the bent parts facing downwards, a flange 13 that protrudes outward from the lower edge of the base 10 is formed by the bent parts of the plate materials 11.

[0051] The upper surface of this base 10 is configured so that components such as an engine (not shown) and a working machine body (not shown) can be placed on it by attaching cross members 14a, 14b and floor plates 15a, 15b as shown in Figure 1.

[0052] In addition, in the illustrated embodiment, an opening 16 is provided on the upper surface of the base 10 without providing the above-mentioned cross members 14a, 14b or floor plates 15a, 15b, and this opening 16 is configured to allow leaked fuel, lubricating oil, etc. from the engine, the work machine body, etc. to fall downward.

[0053] The aircraft is fitted with a box-shaped oil storage tank 17 (see Figure 2) that is located at least below this opening 16 and opens upwards, and leaked oil is collected within this oil storage tank 17 to prevent the oil from leaking outside the aircraft.

[0054] A bracket 21 is provided on the upper edge of the base 10 constructed as described above for supporting the lower edge of the soundproof case 30 (the lower edges of the front panel 31, rear panel 32, and side panel 33), and a water stop plate 22 is provided at least on the peripheral edge of the position where the opening 16 is formed to prevent rainwater from entering.

[0055] In the soundproof box 1 of the present invention, as shown in Figures 2 to 5, a metal plate which serves as a bracket 21 is attached to the outer surface of the side wall 12 of the base 10 at a predetermined height position near the upper end of the side wall 12 by intermittently welding the metal plate at predetermined intervals in the longitudinal direction of the metal plate, thereby providing the above-mentioned bracket 21 which protrudes outward from the upper end of the base 10.

[0056] Furthermore, the portion of the side wall 12 of the base 10 that is located above the mounting position of this bracket 21 is configured as the aforementioned water stop plate 22 that prevents rainwater from entering the interior of the machine.

[0057] In the embodiment shown in Figures 2 to 4, the bracket 21 is formed from a metal strip, and one side of the bracket 21 in the longitudinal direction is butted against the outer surface of the side wall 12 of the base 10 at a predetermined height position. In this state, the bracket 21 is attached to the corner (Ca or Ca') formed by the bracket 21 and the outer surface of the side wall 12 of the base 10 by spot welding using intermittent fillet welding.

[0058] This intermittent fillet welding may be performed on the corner Ca' formed on the upper surface side of the bracket 21, but preferably, as shown in Figure 4, it is performed on the corner Ca formed on the bottom surface side of the bracket 21, so that no bulge such as a weld bead 23 is formed on the upper surface side of the bracket 21.

[0059] By configuring it in this manner, when determining the placement and fixing position of the lower edge of the soundproof case 30 on the bracket 21, there is no need to consider avoiding interference with the raised portion of the weld bead 23, thereby increasing design freedom.

[0060] In the configuration shown in Figures 2 to 4, the bracket 21 is described as being formed from a metal strip and attached by intermittent fillet welding, but instead of this configuration, the bracket 21 may be formed from a metal angle bar having an L-shaped cross section as shown in Figure 5.

[0061] When the bracket 21 is formed from an angle iron in this manner, one piece of the angle iron can be placed in face-to-face contact with the outer surface of the side wall 12 of the base 10 with the other piece on top, as shown in Figure 5, and in this state, one piece can be attached to the outer surface of the side wall 12 of the base 10 at a predetermined interval by spot welding, plug welding, or slot welding (plug welding is shown in Figure 5), so that the lower edge of the soundproof case 30 can be placed on the other piece of the angle iron.

[0062] In this way, by forming the bracket 21 from an angle iron and welding it to the outer surface of the side wall 12 of the base 10 via one side of this angle iron, even with this configuration of bracket 21, no bulges such as weld beads 23 are formed on the upper surface of the bracket 21 on which the lower edge of the soundproof case 30 is placed, and there is no need to consider avoiding interference with the bulge of the weld bead 23 when determining the position to place and fix other components on the bracket 21.

[0063] In addition, in Figures 1 to 3, the symbol 24 is a reinforcing rib, which is attached to the side wall 12 of the base 10 by means of welding or the like, and this rib 24 connects the bottom surface of the bracket 21 to the upper surface of the flange 13, thereby reinforcing the entire base 10 and improving the mounting strength of the bracket 21.

[0064] In the soundproof box 1 of the present invention constructed as described above, even if rainwater gets into the gap Δ between the bracket 21 and the lower edge of the soundproof case 30, as shown in Figure 4, the rainwater is prevented from penetrating into the interior of the soundproof box 1 because its progress is hindered by the water stop plate 22.

[0065] In conventional soundproof boxes, as explained with reference to Figures 8 and 9, the bracket 121 is formed integrally with the side wall 112 of the base 110, and the water stop 122 is attached later by welding, whereas in the soundproof box 1 of the present invention, the water stop 22 is formed integrally with the side wall 12 of the base 10, and the bracket 21 is attached later by welding to the outer surface of the side wall 12 of the base 10, so that the water stop 22 formed integrally with the side wall 12 is watertight from the beginning.

[0066] Therefore, in the conventional soundproof box, after welding the water stop plate 122 as explained with reference to Figure 9 (A), it was necessary to fill the corner Cb formed by the bracket 121 and the water stop plate 122 with sealing material 125. However, in the structure of the soundproof box 1 of the present invention, after the bracket 21 is attached by welding, the box is waterproof as it is, and there is no need to fill with sealing material.

[0067] Moreover, in the soundproof box 1 of the present invention, the bracket 21 is attached to the outer surface of the side wall 12 of the base 10 by intermittent welding, so that a gap δ still exists between the outer surface of the side wall 12 of the base 10 and the bracket 21, except for the welded portion, and the box is not watertight.

[0068] Therefore, as shown by the dashed arrow in Figure 4, rainwater that penetrates into the gap Δ between the lower edge of the soundproof case 30 (the lower edge of the side panel 33 in the illustrated example) and the upper surface of the bracket 21 and flows toward the water stop 22 is not only prevented from penetrating into the inside of the aircraft by the water stop 22, but is also configured to flow downward through the gap δ between the bracket 21 and the outer surface of the side wall 12 of the base 10, allowing the rainwater to be drained without accumulating on the bracket 21.

[0069] In this way, the soundproof box 1 of the present invention adopts a configuration in which the bracket 21 is attached to the outer surface of the side wall 12 of the base 10 by intermittent welding, and therefore the strength of the bracket 21 is lower compared to a configuration in which the bracket 121 is formed integrally with the side wall 112 of the base 110, such as the conventional soundproof box 100 described with reference to Figures 8 and 9.

[0070] Therefore, simply providing a gate-shaped hanging device 40 (see Figure 1) that is erected between both ends of the base 10 in the width direction and fixing each lower end of this hanging device 40 to the bracket 21 by means such as bolts may not provide the strength necessary to hang the soundproof box 1.

[0071] Therefore, in the soundproof box 1 of the present invention, as shown in FIG. 6, each lower end of the hanging device 40 can be fixed not only to the bracket 21 described above, but also to the side wall 12 of the base 10.

[0072] In this configuration, in the soundproof box 1 of the present invention, the lower end of a fixing piece 51 shown in Figure 6 is fixed by welding or other means to the inner surface of the side wall 12 at the upper end of the base 10 where the lower end of the hanging device 40 described above is attached, so that the upper end of this fixing piece 51 protrudes further upward than the upper edge of the water stop plate 22.

[0073] The lower end bottom portion 42 of the hanging device 40 is fixed onto the bracket 21 by means of bolts or the like, and the side portion 43 of the hanging device 40 is fixed to the outer surface of the aforementioned fixing piece 51 by means of bolts or the like.

[0074] By configuring it in this manner, unlike the configuration of conventional soundproof boxes in which the lower end of the hanging device is fixed only to the bracket, in the soundproof box 1 of the present invention, the lower end of the hanging device 40 is attached to both the bracket 21 and the fixed piece 51 attached to the side wall 12 of the base 10.This means that when the soundproof box 1 is hung, the load is not concentrated on the bracket 21 but is also distributed to the side wall 12 of the base 10.As a result, even if the structure of the bracket 21 and the water stop plate 22 provided at the upper end of the base 10 is modified as described above, it is possible to obtain an attachment structure for the hanging device 40 that has the strength to withstand the hanging of the soundproof box 1.

[0075] In the illustrated example, the aforementioned fixing piece 51 is described as being attached to the inner surface of the side wall 12, however, the method of attaching the fixing piece to the side wall 12 is not limited to the illustrated example, and it may be attached, for example, to the upper edge of the side wall 12 (the upper edge of the water stop plate 22). [Explanation of symbols]

[0076] 1 Soundproof box 10 Foundations 11 Board material 12 Side wall (of soundproof box) 13 Flange 14a, 14b Cross members 15a,15b floorboard 16 Opening 17 Oil storage tank 21 Bracket 22 Waterstop 23 Weld Bead 24 Ribs 30 Soundproof Case 31 Front Panel 32 Rear panel 33 Side Panel 34 Top Panel 40 Hanging Device 42 Bottom (lower end of hanging device) 43 Side (of hanging device) 51 Fixed piece Δ Gap (between the bottom edge of the soundproof case and the top surface of the bracket) δ Gap (between bracket and outer surface of base side wall) Ca Corner (corner between the bottom of the bracket and the outer surface of the side wall of the base) Ca' Corner (corner between the top surface of the bracket and the outer surface of the water stop) 100 Soundproof Box 110 Foundation 111 Channel material 111a flange 112 Side wall 117 Oil storage tank 121 Bracket 122 Waterstop 123 Weld Bead 125 Sealing material 130 Soundproof Case 131 Front Panel 132 Rear Panel 133 Side Panel 134 Top Panel 135 Windows 136 Door 140 Hanging Device 141 Lower end (of hanging device) δ' Gap (between the top of the flange and the waterstop) Cb Corner between the flange top and water stop plate (outside of machine) Cb' Corner between the flange top and water stop plate (inside of the machine)

Claims

1. A soundproof box for a work machine is composed of a base formed in a rectangular frame shape in a plan view on which the components of the work machine are placed, and a soundproof case covering the base, A metal bracket for placing the lower edge of the soundproof case is attached to the outer surface of the side wall by intermittent welding so as to protrude horizontally from a predetermined position lower than the upper edge of the side wall of the base, forming a gap between the outer surface of the side wall excluding the welded portion and the bracket, A soundproof box for a work machine, characterized in that the portion of the side wall of the base that is located above the mounting position of the bracket is made as a water stop.

2. The bracket is formed of a metal strip, 2. A soundproof box for a work machine as described in claim 1, characterized in that the bracket is attached to the side wall of the base by performing intermittent fillet welding as the intermittent welding at the corner formed by the bottom surface of the bracket and the outer surface of the side wall of the base.

3. The bracket is formed of a metal angle material having an L-shaped cross section, 2. A soundproof box for a work machine as described in claim 1, characterized in that one piece of the angle iron is brought into face-to-face contact with the outer surface of the side wall with the other piece facing upward, and the bracket is attached to the side wall of the base by intermittent welding of the one piece of the angle iron to the outer surface of the side wall by spot welding, plug welding, or slot welding.

4. A gate-shaped hanging tool is installed between both ends of the base in the width direction, and a fixing piece is fixed to the side wall of the base and has an upper part protruding upward beyond the upper edge of the water stop plate. The bottoms of the hanging devices at their respective lower ends are fixed to the upper surface of the bracket, A soundproof box for a work machine as claimed in any one of claims 1 to 3, characterized in that each side of the hanging device is fixed to the outer surface of the fixing piece that protrudes above the upper edge of the water stop plate.

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