Rotating body, structure including rotating body, stirring device including structure, and method for manufacturing the same.

Abstract

The present invention provides structures that make it easier to prevent damage to internal components due to welding heat. [Solution] The structure 1 comprises a shaft 20 and a hollow rotating body 10 attached to the shaft 20, having a first outer casing 11a and a second member 12 having a second outer casing 12a. The first outer casing 11a includes a first peripheral edge 11a3. The second outer casing 12a includes a second peripheral edge 12a3 which is joined to the first peripheral edge 11a3 by welding to form the rotating body 10. Viewed from the x-direction on which the shaft 20 extends, the outer region of the second peripheral edge 12a3 protrudes from the first peripheral edge 11a3.

Description

Technical Field

[0001] The present invention relates to a structure including a rotating body and the like.

Background Art

[0002] Conventionally, a structure including a rotating body, such as a heat exchanger for powder particles shown in Patent Document 1, has been disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when any member is arranged inside the rotating body at a stage prior to welding each member constituting the rotating body, if the arranged member is made of a material vulnerable to heat, there is a risk of damage to the member due to the heat of welding.

[0005] An object of the present invention is to provide a structure and the like that can easily prevent damage to internal members due to the heat of welding.

Means for Solving the Problems

[0006] The structure according to the present invention includes a shaft, a first member having a first exterior portion, a second member having a second exterior portion, and a hollow rotating body attached to the shaft. The first exterior portion includes a first peripheral edge portion. The second exterior portion includes a second peripheral edge portion that is joined to the first peripheral edge portion by welding to form the rotating body. When viewed from the first direction in which the shaft extends, an outer region of the second peripheral edge portion protrudes from the first peripheral edge portion.

[0007] Compared to a configuration where the size of the second peripheral edge and the size of the first peripheral edge are the same, heat during welding tends to flow more easily in a direction different from the radial direction. Therefore, heat during welding is less likely to flow radially inward, and even if components such as coils are placed inside the rotating body before welding, it becomes easier to prevent heat-induced damage to those components.

[0008] Preferably, the structure further comprises a cover on the side of the shaft that covers the area where the rotating body is not attached and a portion of the rotating body. The first member has a first projection that protrudes from the center of the first exterior portion in one of the first directions. The second member has a second projection that protrudes from the center of the second exterior portion in the other direction in the first direction. A first opening is formed at one end of the first projection in the first direction. A second opening is formed at the other end of the second projection in the first direction. The shaft is fitted into the first opening and the second opening. The end portion of the cover that is joined to the tip of the first projection or the tip of the second projection by welding overlaps with the tip of the first projection or the tip of the second projection when viewed from the radial direction of the shaft.

[0009] Compared to a configuration where the inner diameter of the cover's end and the inner diameter of the projection's tip are the same, heat during welding tends to flow more easily in a direction different from the radial direction. Therefore, heat during welding is less likely to flow radially inward, and even if components such as cables are placed in the space between the cover and the shaft before welding, it becomes easier to prevent heat-induced damage to those components.

[0010] More preferably, the shaft has a shape in which at least one of a groove and / or recess is formed on at least a portion of the cylindrical or columnar side surface, so as to form a space between it and the cover.

[0011] The grooves and other features formed between the inner wall of the cover and the shaft make it easier to arrange components such as cables in the area. The roughly circular opening of the rotating body can be bent into a roughly elliptical shape, making it easier to insert onto the shaft.

[0012] The stirring device according to the present invention includes the aforementioned structure.

[0013] The manufacturing method according to the present invention comprises a rotating body forming step, in which a rotating body is formed by placing a member between a first member and a second member, butting the first peripheral edge of the first member and the second peripheral edge of the second member so that they are in contact, welding the entire circumference of the butted portion of the first peripheral edge and the second peripheral edge, and then performing a finishing process. Before welding is performed around the entire circumference of the butted portion, the outer region of the second peripheral edge protrudes from the first peripheral edge when viewed from the first direction from which the shaft to which the rotating body is attached extends. After welding is performed around the entire circumference of the butted portion, when viewed from the first direction, the outer region of the second peripheral edge overlaps with the region expanded by the bead of the first peripheral edge.

[0014] The rotating body according to the present invention is a hollow rotating body attached to a shaft, comprising a first member having a first outer casing and a second member having a second outer casing. The first exterior portion includes a first peripheral edge portion. The second exterior portion includes a second peripheral portion which is joined to the first peripheral portion by welding in order to form the rotating body. When viewed from the first direction in which the shaft extends, the outer region of the second peripheral edge protrudes from the first peripheral edge. [Effects of the Invention]

[0015] As described above, the present invention provides a structure that can easily prevent damage to internal components due to welding heat. [Brief explanation of the drawing]

[0016] [Figure 1]Perspective view of the structure of the first embodiment. [Figure 2] Cross-sectional configuration diagram of the structure of the first embodiment. [Figure 3] Perspective view of the structure of the first embodiment with the cover omitted. [Figure 4] Cross-sectional configuration diagram of the rotating body of the first embodiment. [Figure 5] Exploded perspective view of the first member and the second member of the rotating body of the first embodiment. [Figure 6] Cross-sectional configuration diagram of the rotating body of the first embodiment after welding and before bead cutting. [Figure 7] Cross-sectional configuration diagram of the rotating body of the first embodiment after bead cutting. [Figure 8] Cross-sectional configuration diagram of a rotating body in which the size of the first peripheral portion is equal to the size of the second peripheral portion. [Figure 9] Perspective view of the structure of the second embodiment. [Figure 10] Perspective view of the structure of the second embodiment with the cover omitted.

Mode for Carrying Out the Invention

[0017] Hereinafter, the first embodiment will be described with reference to the drawings (see FIGS. 1 to 7). Note that the embodiments are not limited to the following embodiments. In addition, the content described in one embodiment is generally applicable to other embodiments as well. Also, each embodiment and each modification can be combined as appropriate.

[0018] To explain the directions, it is assumed that the direction in which the shaft 20 extends is the x direction (first direction), one of the directions perpendicular to the x direction is the y direction, and the direction perpendicular to the x direction and the y direction is the z direction. In FIGS. 1 to 7, FIG. 8 showing the prior art, and FIGS. 9 and 10 of the second embodiment described later, the directions indicated by the arrows of the x-axis, y-axis, and z-axis are defined as the left direction, the front direction, and the upward direction, respectively. To illustrate the positional relationship between the rotating body 10 and the shaft 20, Figure 3 and Figure 10 of the second embodiment described later show the state in which the cover 30 is not attached.

[0019] (Structure 1) As shown in Figures 1 to 3, the structure 1 of the first embodiment comprises a rotating body 10, a shaft 20, and a cover (lining, sleeve) 30. Structure 1 is an agitator or the like, and rotates based on rotational force supplied by a power transmission device (not shown). Structure 1 may be used in devices other than stirring devices. In the first embodiment, an example is described in which two rotating bodies 10 are attached to a shaft 20, and a cover 30 covers the sides of the shaft 20. However, the number of rotating bodies 10 is not limited to two. In the first embodiment, the rotating body 10 on the left side in the x-direction is designated as the first rotating body 10a, and the rotating body 10 on the right side in the x-direction is designated as the second rotating body 10b.

[0020] (Rotating body 10) As shown in Figures 4 and 5, each of the rotating bodies 10 (first rotating body 10a, second rotating body 10b) is composed of a first member 11 and a second member 12, and is attached to the shaft 20. The first member 11 is positioned on one side (left side) in the x-direction, and the second member 12 is positioned on the other side (right side) in the x-direction.

[0021] The first member 11 has a first exterior portion 11a and a first projection portion 11b. The first exterior portion 11a has a first recess 11a1 formed on the side (right side) facing the second exterior portion 12a, and a first protrusion 11a2 formed on the opposite side (left side) of the first recess 11a1. The first exterior portion 11a includes the first peripheral portion 11a3.

[0022] The second member 12 has a second exterior portion 12a and a second projection portion 12b. The second exterior portion 12a has a second recess 12a1 formed on the side (left side) opposite to the first exterior portion 11a, and a second protrusion 12a2 formed on the opposite side (right side) of the second recess 12a1. The second outer casing 12a includes a second peripheral portion 12a3 which is joined to the first peripheral portion 11a3 by welding in order to form the rotating body 10.

[0023] The first peripheral edge 11a3 faces the second peripheral edge 12a3 in the x-direction. However, when viewed from the x-direction, the second peripheral edge 12a3 is not the same size as the first peripheral edge 11a3, but is larger than the first peripheral edge 11a3. When viewed from the left side in the x-direction, the inner region a1 of the second peripheral portion 12a3 overlaps with the first peripheral portion 11a3, while the outer region a2 of the second peripheral portion 12a3 extends beyond the first peripheral portion 11a3.

[0024] Figures 4 and 5 show the state before welding, where the outer region a2 of the second peripheral edge 12a3 protrudes from the first peripheral edge 11a3.

[0025] Furthermore, the area between the first peripheral edge 11a3 and the second peripheral edge 12a3 has a V-shaped groove cross-section, which functions as a groove during welding. When the first peripheral edge 11a3 and the second peripheral edge 12a3 are welded together, a bead b1 is formed around the first peripheral edge 11a3 (see Figure 6). The bead b1 is subjected to finishing processes such as bead cutting (see Figure 7). After welding, when viewed from the left side in the x-direction, the outer region a2 of the second peripheral edge 12a3 overlaps with the region extended by the bead b1 around the first peripheral edge 11a3.

[0026] The first peripheral edge 11a3 and the second peripheral edge 12a3 are butted together so that they abut, the entire circumference of the butted portion of the first peripheral edge 11a3 and the second peripheral edge 12a3 is welded, and finishing processes such as bead cutting are performed to form a rotating body 10 that is substantially hollow and disc-shaped.

[0027] The first projection 11b has a shape that smoothly protrudes to the left in the x-direction from the central opening of the first outer casing 11a. The second projection 12b smoothly protrudes to the right in the x-direction from the central opening of the second outer casing 12a. A first opening 11b1 is formed at the left end of the first projection 11b in the x-direction. A second opening 12b1 is formed at the tip of the second projection 12b on the right side in the x-direction.

[0028] The first exterior portion 11a and the second exterior portion 12a have a substantially circular shape when viewed from the x direction. However, the external shape of the first exterior part 11a and the second exterior part 12a as viewed from the x-direction is not limited to a strictly circular shape. For example, as shown in Figures 1 and 3, the first exterior portion 11a and the second exterior portion 12a may each be substantially circular when viewed from the x-direction, and may have two substantially trapezoidal notched recesses 13 symmetrically positioned, extending from the periphery toward the center. In this case, the plate surface may have a wedge shape when viewed from a side perpendicular to the x-direction, such that the thickness in the x-direction from one side edge of one notched recess 13 to the other side edge of the other notched recess 13 gradually increases. Additionally, a scraping blade (not shown) may be provided in the notched recess 13.

[0029] (Shaft 20) The shaft 20 has a substantially hollow cylindrical shape that extends in the x-direction. A power transmission device (not shown) that applies rotational force to the shaft 20 is provided at the end of the shaft 20. Receiving rotational force from the power transmission device, the shaft 20, the rotating body 10 attached to the shaft 20, and the cover 30 rotate around an axis parallel to the x-direction. The outer diameter of the shaft 20, which is approximately hollow and cylindrical, is approximately equal to the inner diameter of the first opening 11b1 and the second opening 12b1. The shaft 20 is fitted into the first opening 11b1 and the second opening 12b1 of the rotating body 10.

[0030] (Cover 30) The cover 30 has a substantially hollow cylindrical shape that extends in the x direction. The cover 30 covers the area on the side of the shaft 20 where the rotating body 10 is not attached, and the left end of the first projection 11b in the x-direction and the right end of the second projection 12b in the x-direction on the rotating body 10. In the first embodiment, the cover 30 on the left side in the x-direction is designated as the first cover 30a, the cover 30 in the center in the x-direction is designated as the second cover 30b, and the cover 30 on the right side in the x-direction is designated as the third cover 30c.

[0031] The cover 30 (second cover 30b) provided between the two rotating bodies 10 (first rotating body 10a, second rotating body 10b) also functions as a sleeve that determines the x-direction spacing between the two rotating bodies 10 (first rotating body 10a, second rotating body 10b). The inner diameter of the cover 30 is approximately equal to the outer diameter of the left tip of the first projection 11b in the x-direction, and the outer diameter of the right tip of the second projection 12b in the x-direction.

[0032] The right end of the cover 30 in the x-direction, which is joined by welding to the left tip of the first projection 11b in the x-direction, overlaps with the left tip of the first projection 11b in the x-direction when viewed from the radial direction (y-direction, etc.) of the shaft 20. The left end of the cover 30 in the x-direction, which is joined by welding to the right tip of the second projection 12b in the x-direction, overlaps with the right tip of the second projection 12b in the x-direction when viewed from the radial direction (y-direction, etc.) of the shaft 20.

[0033] (Assembly Instructions) Next, we will explain the assembly procedure for structure 1.

[0034] (Rotational body formation process) With a component (such as a coil or other heating element) placed between the first component 11 and the second component 12, the first peripheral edge 11a3 and the second peripheral edge 12a3 are butted together so that they are in contact, the entire circumference of the butted portion of the first peripheral edge 11a3 and the second peripheral edge 12a3 is welded, and finishing processes such as bead cutting are performed to form the rotating body 10 (rotating body formation process).

[0035] (Installation process) The shaft 20 is inserted through the first opening 11b1 and the second opening 12b1 of the first rotating body 10a. In the first embodiment, an example is shown in which the rotating body 10 is attached to the shaft 20 after the rotating body formation process. However, the first member 11 and the second member 12 may be attached to the shaft 20 separately, and the aforementioned rotating body forming process may be performed while they are attached to the shaft 20.

[0036] The first cover 30a is attached at its right end in the x-direction such that it covers the tip of the first projection 11b of the first rotating body 10a. The second cover 30b is attached at its left end in the x-direction such that it covers the tip of the second projection 12b of the first rotating body 10a.

[0037] The shaft 20 is inserted into the first opening 11b1 and the second opening 12b1 of the second rotating body 10b. At this time, the tip of the first projection 11b of the second rotating body 10b is covered by the right end of the second cover 30b in the x direction. The third cover 30c is attached at its left end in the x-direction such that it covers the tip of the second projection 12b of the second rotating body 10b.

[0038] (Joining process) The right end of the first cover 30a in the x-direction and the tip of the first projection 11b of the first rotating body 10a are joined by welding. The left end of the second cover 30b in the x-direction and the tip of the second projection 12b of the first rotating body 10a are joined by welding. The right end of the second cover 30b in the x-direction and the tip of the first projection 11b of the second rotating body 10b are joined by welding. The left end of the third cover 30c in the x-direction and the tip of the second projection 12b of the second rotating body 10b are joined by welding.

[0039] (Effects of the outer region a2 of the second peripheral edge 12a3 extending beyond the first peripheral edge 11a3) When welding thin sheets, attempting to weld them securely results in weld metal melting and creating beads on the back of the sheet, making it unavoidable that the back of the sheet will be subjected to strong heat. In this embodiment, while maintaining an appearance similar to a thin butt weld, it has a weld structure similar to a fillet weld, utilizing the step difference resulting from the difference in the peripheral length of the objects to be welded, and it is possible to prevent molten metal from leaking to the back side of the plate. Therefore, it becomes possible to weld in a way that ensures a sufficient amount of welding, almost equivalent to the plate thickness, while minimizing the impact of welding heat on the components on the back side of the plate (inside the rotating body 10).

[0040] This welded structure is effective with any welding method. In particular, in welding structures where the welding heat source has penetrating power, such as laser welding, and heat easily penetrates in butt welding of thin plates, it is possible to align the angle of incidence of heat with the cross-sectional direction of the plate (see dotted arrow in Figure 4). This allows the penetrating heat to be contained within the cross-section of the plate, resulting in a particularly significant reduction in thermal effects.

[0041] In other words, compared to the embodiment in which the size of the second peripheral portion 12a3 and the size of the first peripheral portion 11a3 are the same (see Figure 8), the heat during welding flows more easily in a direction different from the radial direction (to the right in the x-direction) (see the dotted arrow in Figure 4). Therefore, heat during welding is less likely to flow radially inward, and even if components such as coils are placed inside the rotating body 10 (between the first outer casing 11a and the second outer casing 12a) before welding, it becomes easier to prevent heat-induced damage to those components.

[0042] (The effect of the edge of the cover 30 covering the tip of the protrusion) Compared to a configuration where the inner diameter of the end of the cover 30 and the inner diameter of the tip of the projection (such as the first opening 11b1) are the same, heat during welding tends to flow more easily in a direction different from the radial direction (to the right or left in the x-direction) (see the dotted arrow in Figure 2). Therefore, heat during welding is less likely to flow radially inward, and even if components such as cables are placed in the space between the cover 30 and the shaft 20 before welding, it becomes easier to prevent damage to those components due to heat.

[0043] (Example of the shape of shaft 20, second embodiment) In the first embodiment, an example was described in which the shaft 20 has a substantially hollow cylindrical shape. However, the shaft 20 may also be in a substantially solid cylindrical shape. Furthermore, the hollow cylindrical or solid cylindrical shape of the shaft 20 is not limited to a perfectly cylindrical or cylindrical shape, respectively. For example, the shaft 20 may have a cylindrical or columnar shape in which at least one of a groove and a recess are formed on a part of its side surface. Specifically, the shaft 20 may be a columnar shape with one side surface D-cut, a columnar shape with two parallel side surfaces D-cut, or a columnar shape with two parallel side surfaces D-cut and grooves extending in the x-direction formed on the cut surfaces (see Figures 9 and 10, second embodiment).

[0044] (The effect of changing a cylindrical shape to a D-cut column shape, etc.) The D-cut area and grooved area formed between the inner wall of the cover 30 and the shaft 20 facilitate the placement of components such as cables. The openings (first opening 11b1, second opening 12b1) of the rotating body 10 are made to bend from a roughly circular shape to a roughly elliptical shape, making it easier to insert into the shaft 20.

[0045] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents. [Explanation of symbols]

[0046] 1 structure 10. Solids of revolution 10a First Rotating Body 10b Second Rotating Body 11. First Member 11a 1st exterior part 11a1 First recess 11a2 First protrusion 11a3 First peripheral area 11b 1st protrusion 11b1 1st opening 12 Second Member 12a 2nd exterior part 12a1 Second recess 12a2 Second protrusion 12a3 Second peripheral area 12b 2nd protrusion 12b1 2nd opening 13 Notched recess 20 shafts 30 Cover 30a First Cover 30b Second cover 30c Third Cover a1 Inner region of the second periphery a2 Outer region of the second periphery b1 bead

Claims

1. The shaft and A hollow rotating body is attached to the shaft and comprises a first member having a first outer casing and a second member having a second outer casing. The first exterior portion includes the first peripheral portion, The second exterior portion includes a second peripheral portion which is joined to the first peripheral portion by welding in order to form the rotating body. A structure in which, when viewed from the first direction in which the shaft extends, the outer region of the second peripheral edge protrudes from the first peripheral edge.

2. The shaft further comprises a cover on its side surface that covers the area where the rotating body is not attached and a portion of the rotating body, The first member has a first projection that protrudes from the center of the first outer casing in one of the first directions, The second member has a second projection that protrudes from the center of the second outer casing in the other direction of the first direction, A first opening is formed at one end of the first projection in the first direction. A second opening is formed at the other end of the second projection in the first direction. The shaft is fitted into the first opening and the second opening. The structure according to claim 1, wherein the end portion of the cover, which is joined to the tip of the first projection or the tip of the second projection by welding, overlaps with the tip of the first projection or the tip of the second projection when viewed from the radial direction of the shaft.

3. The structure according to claim 2, wherein the shaft has a shape in which at least one of a groove and a recess is formed on at least a portion of the cylindrical or columnar side surface so as to form a space between it and the cover.

4. A stirring device comprising the structure described in any one of claims 1 to 3.

5. The process includes a rotating body forming step in which, with a member positioned between a first member and a second member, the first peripheral edge of the first member and the second peripheral edge of the second member are brought into contact, the entire circumference of the joined portion of the first and second peripheral edges is welded, and finishing is performed to form the rotating body, Before welding is performed around the entire circumference of the butted portion, when viewed from the first direction from which the shaft to which the rotating body is attached extends, the outer region of the second peripheral edge protrudes from the first peripheral edge. A manufacturing method wherein, after welding is performed around the entire circumference of the butted portion, the outer region of the second peripheral edge overlaps with the region expanded by the bead of the first peripheral edge when viewed from the first direction.

6. A hollow rotating body attached to a shaft, comprising a first member having a first outer casing and a second member having a second outer casing, The first exterior portion includes the first peripheral portion, The second exterior portion includes a second peripheral portion which is joined to the first peripheral portion by welding in order to form the rotating body. A rotating body in which, when viewed in the first direction in which the shaft extends, the outer region of the second peripheral edge protrudes from the first peripheral edge.

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