JP5428679B2 - Closed switchboard frame assembly structure - Google Patents

Description

  The present invention relates to a frame assembly structure of a closed switchboard constructed by an assembly method by riveting or screw fastening.

  As is well known, closed switchboard cabinets have side panels, bottom panels, and ceilings on the perimeter of a box-shaped frame (free standing skeleton) constructed by connecting vertical beams, transverse beams, and depth beams that are orthogonal to each other. A configuration in which a plate is attached is common.

  Recently, in order to reduce the cost by reducing the weight of the panel, welding, and painting, the thin plate-plated steel sheet is used as the vertical beam, horizontal beam, and depth beam. There are many assembled structures that use beam members made by bending sheet metal to the plate, and riveted or screw-fastened the beam members through reinforcing corner pieces arranged at each corner of the frame. Various proposals have been made for the frame assembly structure (see, for example, Patent Document 1 and Patent Document 2).

  Next, as a conventional example, a corner piece made of steel plate is arranged at the corner portion of the frame, and the end of the beam member manufactured by sheet metal processing on the corner piece is overlapped and riveted to butt rivet joints. The frame assembly structure is shown in FIGS. 8 (a) and 8 (b). In the figure, 1, 2, and 3 are vertical, horizontal, and depth beams with a cross-section of “U” shaped by bending sheet metal to a standard thin plate steel plate (long plate) with a thickness of 1.6 mm. The beam members 4 are corner pieces, and rivet holes 5 are drilled in advance in alignment with the respective beam members of the vertical beam 1, the horizontal beam 2, and the depth beam 3, and the plate surface of the corner piece 4. When the board frame is assembled, the ends of the vertical beam 1, the horizontal beam 2 and the depth vertical beam 3 are butted in directions orthogonal to each other and overlapped on the outer surface of the corner piece 4 as shown in the figure. The rivet 6 that has passed through is crimped to form a corner portion of the frame. An assembly structure in which bolts are used instead of riveting is also known.

JP-A-9-215122 JP 2006-25472 A

  By the way, in the case of a rivet assembly type closed switchboard, the corner portion of the frame is required to have a sufficiently high strength against bending and moment load in order to prevent tilting and falling of the panel cabinet. In this respect, as in the frame assembly structure of the conventional example shown in FIG. 8, the ends of the vertical beam 1, the horizontal beam, and the depth beam 3 are butted from directions orthogonal to each other, and the corner piece 4 is attached to the inside of the butted portion. In the rivet joint structure in which the corner pieces 4 and the beam members are riveted to each other, the gap between the longitudinal beam 1, the transverse beam 2, and the depth beam 3 is indirectly connected via the corner piece 4. Since the strength of the corner portion depends on the strength of the corner piece made of sheet metal, it is difficult to ensure a sufficiently high strength.

  For this reason, in a large-sized switchboard equipped with heavy electrical equipment, the thickness of the corner pieces 4 is increased or the number of rivets is increased, or as described in Patent Document 2 mentioned above, It is necessary to increase the strength of the corner portion by, for example, arranging a mounting member of a cast structure at the corner portion and coupling it to the beam member.

  In addition, the switchboard is provided with a hanging bracket on the top of the cabinet in order to cope with the movement and transportation work of the panel. However, if the hanging bracket is fixed directly to the beam member, depending on the mounting position, the panel can be lifted. At this time, a large concentrated load is applied to the beam member made of a thin steel plate, which may cause distortion and bending deformation.

  In addition, for the corner piece 4, there is a demand for the development of a frame assembly structure that can reduce the material cost by using a thin steel plate equivalent to the beam members of the vertical beam 1, the horizontal beam 2, and the depth beam 3.

  The present invention has been made in view of the above points. The object of the present invention is to provide a high machine for a corner portion of a frame constructed by assembling a sheet metal by bending a sheet steel plate and combining a beam member to rivet or screw fastening. An object of the present invention is to provide a frame assembly structure for a closed switchboard that is improved so as to improve the assemblability and cost while ensuring the strength.

In order to achieve the above object, according to the present invention, a frame assembly structure of a closed switchboard in which a box-shaped frame is constructed by combining and combining vertical beams, horizontal beams, and depth beams orthogonal to each other, the vertical beams, horizontal beams, The beam member of the depth beam is a sheet metal bent into a cross-section "U" or "C".
At the corners of the frame, the ends of the vertical beam, horizontal beam, and depth beam are overlapped and combined in a mating manner, and then the overlapping plate surfaces of the beam members are directly riveted or screwed. The corner reinforcement plate is joined to the corner portion of the frame, and a corner reinforcing plate obtained by bending a sheet metal sheet is overlapped on the corner portion, and then the corner reinforcing plate is riveted to each beam member of the vertical beam, the horizontal beam, and the depth beam. The corner reinforcing plate joined to the corners of the upper four corners of the frame is also used as a hanging bracket, and the upper end of the corner reinforcing plate protrudes upward from the frame. A hook-hanging hole is drilled in the surface (claim 1).

Further, the above-mentioned corner reinforcing plate also serving as a hanging bracket has a laminated plate structure in which a plurality of thin steel plates are overlapped and joined in order to ensure the strength required for the lifting load of the panel (claim) Item 2 ).

According to said structure, there can exist the following effect.
(1) At each corner of the box-shaped frame, the ends of each beam member of the vertical beam, horizontal beam, and depth beam are combined in a fitting manner so that the plate surfaces overlap inside and outside, and then the overlapping plate Since the corner portion of the frame is configured by a lap joint structure in which the surfaces are riveted or directly joined by screw fastening, the corner piece arranged at the corner portion as shown in FIG. Compared with the butt-type indirect joint structure in which the ends of the beam members are overlapped and joined together, the strength of the corner portion can be increased.

In addition to the frame assembly structure described above, a sheet metal corner reinforcing plate combined with the corner portion of the frame straddling the end of each beam member is riveted to the plate surface of each beam member or screwed. As a result of the integral coupling, the strength of the corners of the frame can be further enhanced by increasing the second moment of section and section modulus.
(2) Furthermore, by using the corner reinforcement plate combined with the corners of the upper four corners of the box-shaped frame as a hanging bracket, the load applied when lifting the panel is distributed from the corner reinforcement plate to the vertical beam, horizontal beam, and depth beam. It is possible to prevent the beam member from being distorted and bent, and in addition, the corner reinforcing plate is made of a laminated structure of a plurality of thin steel plates, so that the strength as a hanging metal fitting and a corner portion can be further increased. .

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the upper corner part of the frame assembly structure concerning Example 1 of this invention, (a) is a perspective view of the assembly state seen from the outer side of a frame, (b), (c) is each seen from the inner side of a frame. FIG. 3 is a perspective view of a disassembled state and a combined state. It is a whole block diagram of the frame assembly structure concerning Example 2 of this invention, (a) is a perspective view of an assembly state, (b) is an exploded perspective view. FIG. 3 is a detailed structural view of the upper corner portion of the arrow A in FIG. 2 as viewed from the inside of the frame, where (a) is a perspective view in an assembled state, and (b) is an exploded perspective view. FIG. 3 is a detailed structural view of the upper corner portion of the arrow A in FIG. 2 as viewed from the outside of the frame, in which (a) is a perspective view in an assembled state, and (b) is an exploded perspective view. FIGS. 3A and 3B are detailed structural views of a corner reinforcing plate also serving as a hanging metal fitting, in which FIG. 3A is an external perspective view, and FIG. 3B is an exploded perspective view of FIG. FIG. 3 is a detailed structural view of a lower corner portion of arrow B in FIG. 2 as viewed from the inside of the frame, where (a) is a perspective view in an assembled state, and (b) is an exploded perspective view. FIG. 3 is a detailed structural view of a lower corner portion of a B portion in FIG. 2 as viewed from the outside of the frame, in which (a) is a perspective view in an assembled state, and (b) is an exploded perspective view. It is the frame assembly structure figure of a prior art example, (a) is a perspective view of the assembly state of a corner part, (b) is an exploded perspective view.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on the examples shown in FIG. 1 and FIGS. In addition, in the figure of an Example, the same code | symbol is attached | subjected to the member corresponding to FIG. 7, and the detailed description is abbreviate | omitted.

First, the upper corner portion of the frame assembly structure of a first embodiment of the present invention in FIG. 1 (a) ~ (c) . In the figure, the vertical beam 1, the horizontal beam 2 and the depth beam 3 are the same as the beam member shown in FIG. 8, and are formed by subjecting a long sheet-plated steel plate having a thickness of about 1.6 mm to sheet metal bending processing. "," C-shaped "beam member. The end portions of the vertical beam 1, the horizontal beam 2, and the depth beam 3 are combined in directions orthogonal to each other as described below, and then riveted to form a corner portion of the frame.

  That is, the vertical beam 1, the horizontal beam 2, and the depth beam 3 are formed with bent portions 1a, 1b, 2a, 2b, and 3a, 3b on the inner side along the side edges in the longitudinal direction. Then, the bent portion is absent, and the end portion 1c is formed by bending both ends of the longitudinal beam 1 in the cross-sectional direction. Further, rivet holes 5 through which the rivets 6 are passed are drilled in the plate surfaces at the ends of the beam members as shown in the drawing.

  Then, in the assembly process of the frame, first, from the disassembled state of each beam member shown in FIG. 1 (b), the end portions of the horizontal beam 2 and the depth beam 3 are respectively inserted in the direction of the arrow with the upper end portion of the vertical beam 1 in between. The outer beam 1 is fitted into the outer side and the inner side of the outer beam 1, and the ends of the beam members are combined so that the end portions of the beam members overlap with each other with a step corresponding to the plate thickness inside and outside. Next, the rivet 6 is passed through the overlapping rivet holes 5 in this combined state, and crimped with a tool such as an air hammer (see FIG. 1A).

  With this assembly structure, the ends of the beam members of the vertical beam 1, the horizontal beam 2, and the depth beam 3 are integrally rivet-coupled as an overlap joint. Thereby, compared with the indirect joint structure of the conventional example shown in FIG. 8, even if the thin steel plate of each beam member is the same board thickness, the intensity | strength of a corner part increases significantly. In addition, the conventional corner piece 4 can be omitted, and the number of parts and the number of assembling steps can be reduced and the assemblability can be improved.

Next, based on the frame assembly structure of the first embodiment, a second embodiment of the present invention in which a corner reinforcing plate is added to each corner portion of the frame to further enhance the strength is shown in FIGS. explain.

  In this embodiment, as shown in FIGS. 2 (a) and 2 (b), with respect to a box-shaped frame constructed by combining a vertical beam 1, a horizontal beam 2 and a depth beam 3 which are orthogonal to each other, the corners at the upper and lower four corners thereof. An upper corner reinforcing plate 7 and a lower corner reinforcing plate 8 made of a sheet metal processed product of a thin steel plate are added and assembled to each part.

  The corner reinforcing plates 7 and 8 are formed by bending a sheet steel plate as described later following the outline shape of the corner portion shown in the first embodiment (see FIG. 1). After covering the end opening surfaces of the vertical beam 1, the horizontal beam 2, and the depth beam 3 so as to overlap each other, the overlapping surface with each beam member is riveted to be integrally connected.

  Here, the upper corner reinforcing plate 7 also serves as a hanging bracket for the board, and as shown in FIGS. 5 (a) and 5 (b), the reinforcing plates 7-1 and 7- are obtained by dividing the thin steel plate into two pieces. 2 and a flange structure 7b, 7c, 7e, 7f for riveting that protrudes in a tongue-like shape as shown in the figure on the periphery of the Z-shaped substrate portion 7a. A hook hook hole 7g that functions as a hanging metal fitting is opened on the upper portion of the substrate portion 7a. In the rivet hole row shown in the figure, reference numeral 5a denotes a rivet hole drilled in the substrate portion 7a so that two reinforcing plates 7-1 and 7-2 are overlapped and joined together, and 5b denotes a reinforcing plate 7. Rivet holes 5c for riveting to the overlapping surface with the beam member 5c are escape holes for rivets that pass through the rivet holes 5b drilled in the substrate portion 7a of the reinforcing plate 7-1.

  On the other hand, the lower corner reinforcing plate 8 is slightly different in shape from the above-described corner reinforcing plate 7 also serving as a hanging metal fitting, and as shown in FIG. 6B, the upper corner reinforcing plate is provided at the periphery of the Z-shaped substrate portion 8a. Like the plate 7, flange portions 8b to 8e for riveting are formed by bending.

Next, the assembly procedure of the frame assembly for assembling the corner reinforcing plates 7 and 8 to the corner will be described with reference to FIGS. 3 and 4 and FIGS.
First, with respect to the corner reinforcing plates 7 attached to the corners at the upper four corners of the box-shaped frame, the vertical beam 1, the horizontal beam 2, and the depth beam 3 from the disassembled state of the frame shown in FIGS. 3 (b) and 4 (b). The end portions of the beam members are combined in the procedure as described in the first embodiment (see FIG. 1), and the ends of the beam members are rivet-fastened, and reinforced from the inside of the frame as shown in FIG. 3 (a). After the plate 7 is put on the corner portion and superposed on the corner portion, the flange portions 7c and 7d and the bent portion 1a of the vertical beam 1 are formed between the substrate portion 7a and the flange portion 7b and the bent portions 3a and 3b of the depth beam 3. , 1b, and between the flange portions 7e, 7f and the bent portions 2a, 2b of the cross beam 2, the rivets 6 are swaged to the rivet holes 5 previously drilled in the respective members. Further, in this assembled state, the upper end portion of the corner reinforcing plate 7 protrudes upward from the frame to serve as a hanging bracket.

  According to the assembly structure of the upper corner portion described above, the corner portion is formed in the cylindrical structure by adding the corner reinforcement plate 7, so that it is compared with the assembly structure of Example 1 (without the corner reinforcement plate). The second moment of section and section modulus are increased, and the strength of the corner is further increased. In addition, since the corner reinforcing plate 7 that is riveted across the beam members of the vertical beam 1, the horizontal beam 2, and the depth beam 3 also serves as a panel mounting bracket, the lifting load of the panel is limited to some beams. There is no concentrated load on the member, which effectively prevents the beam member from being distorted or bent. Furthermore, as shown in the illustrated embodiment, the corner reinforcing plate 7 also serves as a hanging metal fitting, and the strength of the corner reinforcing plate 7 is increased by using a laminated structure of two sheets, so that the corner reinforcing plate 7 can be made of a thin steel plate equivalent to each beam member. This can reduce the material cost.

  On the other hand, with respect to the corner reinforcing plate 8 arranged at the corners at the lower four corners of the box-shaped frame, the corner reinforcing plate 8 is superimposed on the corner from the inside of the frame as shown in FIGS. Between the substrate portion 8a, the flange portion 8e and the bent portions 1a, 1b of the vertical beam 1, between the flange portions 8b, 8c, the bent portions 3a, 3b of the depth beam 3, and the bent portion 2b of the transverse beam 2, and the flange portion. Between 8d and 8e, the bent portion 2a of the horizontal beam 2, and the bent portion 1b of the vertical beam, the rivet 6 is swaged to the rivet hole 5 previously drilled in each member.

  In the frame assembly structure of the illustrated embodiment, all the frame members are fastened by riveting, but screws may be fastened by bolts and nuts instead of rivets.

1: Vertical beam 2: Cross beam 3: Depth beam 5: Rivet hole 6: Rivet 7: Upper corner reinforcing plate 7g: Hook hook hole 8: Lower corner reinforcing plate

Claims (2)

This is a closed switchboard frame assembly structure in which box beams are constructed by combining and combining vertical beams, horizontal beams, and depth beams that are orthogonal to each other, and the beam members of the vertical beams, horizontal beams, and depth beams are cross-sectionally “U-shaped”. "Or" C-shaped "by bending sheet metal,
At the corners of the frame, the ends of the vertical beam, horizontal beam, and depth beam are overlapped and combined in a mating manner, and then the overlapping plate surfaces of the beam members are directly riveted or screwed. The corner reinforcement plate is joined to the corner portion of the frame, and a corner reinforcing plate obtained by bending a sheet metal sheet is overlapped on the corner portion, and then the corner reinforcing plate is riveted to each beam member of the vertical beam, the horizontal beam, and the depth beam. The corner reinforcing plate joined to the corners of the upper four corners of the frame is also used as a hanging bracket, and the upper end of the corner reinforcing plate protrudes upward from the frame. A closed switchboard frame assembly structure characterized in that hook hook holes are drilled on the surface . 2. The frame assembly structure according to claim 1 , wherein the corner reinforcing plate provided at the corners of the upper four corners of the frame has a laminated plate structure in which a plurality of thin steel plates are joined together. Frame assembly structure.