Reversing device and reversing method

Abstract

To provide a reversing device capable of reversing a reversing object stably and capable of separating the reversing object from the reversing device by moving the reversed reversing object upward, and to provide a reversing method.SOLUTION: A reversing device 5 for reversing upper and lower sides of a reversing object 1 includes: a frame 6 for forming an insertion part 12 into which the reversing object 1 is inserted and for rotating around a rotation center axis line along the horizontal direction; a power part 7 connected so as to transmit torque to the frame 6; and a support material 8 for fixing the reversing object 1 to the frame 6 by connecting an outer peripheral part 4 of the reversing object 1 inserted into the insertion part 12 and a portion 14 opposing to the outer peripheral part 4 of the reversing object 1 on the frame 6. An inner diameter of the insertion part 12 is larger than an outer diameter of the reversing object 1, and the reversing object 1 is inserted into the insertion part 12 from above.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an inversion device and an inversion method for inverting an object upside down. [Background technology]

[0002] For example, in a production line of a steelworks, there is a heat treatment furnace for heat treating steel plates. In the heat treatment furnace, the air inside the heat treatment furnace is heated by a burner and stirred to raise the temperature of the entire steel plate to a temperature determined by design. As an example of a method for stirring the air inside the heat treatment furnace, a circulation fan is conventionally provided inside the heat treatment furnace. In the heat treatment furnace, circulation fans are attached to both the top and bottom of the heat treatment furnace, and the air inside the heat treatment furnace is stirred from both the top and bottom of the heat treatment furnace.

[0003] The above-mentioned circulation fans share common parts in order to reduce material and manufacturing costs, and as a result, each circulation fan has almost the same specifications or structure. In addition, when inspecting or repairing each circulation fan, the circulation fan that was installed at the top may be inverted and installed at the bottom, or vice versa, and this type of circulation fan inversion work occurs frequently.

[0004] Conventionally, the work of turning the circulation fan upside down has been done manually by changing the chain block attached to the circulation fan. This is dangerous work, so there is a need to make the inversion work safer and more efficient.

[0005] Examples of techniques related to inversion devices are described in Patent Document 1 and Patent Document 2. Patent Document 1 discloses a container inversion machine that grips a container with a pair of gripping members and inverts the container upside down. Patent Document 2 discloses a heavy object inversion device in which a mounting part such as a flange of a heavy object is placed on a mounting table, the mounting part is fixed to the mounting table, and the heavy object is inverted together with the mounting table in this state by a motor or manually. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication 2019-131304 [Patent Document 2] Patent Publication No. 9-58825 Summary of the Invention [Problem to be solved by the invention]

[0007] In the container inversion machine shown in Patent Document 1, when the weight of the object to be inverted increases, the force for gripping the object to be inverted (hereinafter referred to as gripping force) is increased accordingly. However, if the gripping force cannot be increased sufficiently relative to the weight of the object to be inverted, the object to be inverted may fall during inversion. Even if the gripping force can be increased sufficiently relative to the weight of the object to be inverted, the object to be inverted may not have enough strength to withstand the gripping force.

[0008] In the heavy load inversion device shown in Patent Document 2, as described above, the mounting part of the heavy load is placed on the mounting table and fixed, and the heavy load is inverted together with the mounting table in this state. Therefore, when the heavy load is inverted, the mounting table is located above the mounting part of the heavy load. Therefore, when the inverted heavy load is lifted up and moved away from the mounting table, the mounting part of the heavy load gets caught on the mounting table. In other words, the inverted heavy load cannot be lifted above the mounting table to move away from the mounting table.

[0009] The present invention has been made to solve the above-mentioned problems, and aims to provide an inversion device and an inversion method that can stably invert an object to be inverted, and can move the inverted object upward to separate it from the inversion device. [Means for solving the problem]

[0010] In order to achieve the above object, the present invention provides [1] An inversion device which inverts an object to be inverted upside down, comprising: a stand which forms an insertion portion into which the object to be inverted is inserted and which rotates around a horizontal central axis of rotation; a power unit which is connected to the stand so as to be able to transmit torque; and a support material which connects an outer periphery of the object to be inverted inserted into the insertion portion to a portion of the stand which faces the outer periphery of the object to be inverted, thereby fixing the object to be inverted to the stand, wherein the inner diameter of the insertion portion is larger than the outer diameter of the object to be inverted, and the object to be inverted is inserted into the insertion portion from above. [2] An inversion device as described in [1], wherein a flange is provided on the outer periphery of the object to be inverted, and a mounting flange is provided on the stand protruding radially inwardly of the insertion portion, one end of the support material is connected to the underside of the flange, and the other end of the support material is connected to the underside of the mounting flange. [3] The inversion device described in [1], wherein the support material is formed in a plate shape. [4] The inversion device according to any one of [1] to [3], wherein the power unit has a reducer that increases the torque. [5] The inversion device according to [4], wherein the reducer is a worm reducer. [6] An inversion method for inverting an object to be inverted upside down, comprising: a placing step for inserting the object to be inverted from above into an insertion portion formed by a frame and placing an outer periphery of the object to be inverted on one end of a support material having the other end connected to the frame; a fixing step for connecting one end of the support material to the outer periphery of the object to be inverted and fixing the object to the frame via the support material; an inversion step for inverting the object to be inverted upside down by rotating the frame around a central axis of rotation along the horizontal direction; and a moving step for, with the object to be inverted upside down, releasing the connection between the other end of the support material and the frame to release the fixation of the object to be inverted to the frame via the support material and moving the object to be inverted above the frame. Effect of the Invention

[0011] According to the present invention, the object to be inverted can be stably inverted upside down, and the inverted object to be inverted can be moved upward to separate the object to be inverted from the inversion device. [Brief description of the drawings]

[0012] [Figure 1] FIG. 4 is a diagram illustrating an example of a circulation fan according to the present embodiment. [Diagram 2] FIG. 1 is a diagram illustrating an example of a reversing device according to an embodiment of the present invention. [Diagram 3] FIG. 3 is a view taken along the arrow A in FIG. 2. [Figure 4] FIG. 3 is a view taken along the arrow B in FIG. 2. [Diagram 5] FIG. 3 is a view taken along the arrow C in FIG. 2. [Figure 6] 3 is an enlarged view of a portion of the reversing device shown in FIG. 2. [Figure 7] 4 is a flowchart illustrating an example of an inversion method according to the present embodiment. [Figure 8] 3 is a diagram showing a state in which the circulation fan shown in FIG. 2 is reversed. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] An example of an embodiment of the present invention (hereinafter, referred to as the present embodiment) will be described below. The inversion device of the present embodiment inverts an object to be inverted upside down, in particular an object to be inverted with a flange upside down. An object to be inverted with a flange means an object to be inverted that has a flange or a flange-like protrusion on its outer periphery. Specifically, an example of an object to be inverted with a flange is a circulation fan installed in a heat treatment furnace.

[0014] Although not shown in detail, the above-mentioned heat treatment furnace may be a conventionally known heat treatment furnace that is installed in a production line of a steelworks to heat treat steel sheets. In the heat treatment furnace, the air inside the heat treatment furnace is heated by a burner, and the air heated by the burner is stirred by a circulating fan to raise the temperature of the entire steel sheet to a temperature determined by design.

[0015] Circulation fans with almost the same specifications or almost the same configuration are installed facing each other at the top and bottom of the heat treatment furnace. Here, facing each other means that the circulation fan at the top of the heat treatment furnace and the circulation fan at the bottom of the heat treatment furnace are vertically overlapping each other, and the air flows sent out from each circulation fan face each other across the steel sheet. In this way, the circulation fan at the top of the heat treatment furnace and the circulation fan at the bottom of the heat treatment furnace are installed in the heat treatment furnace upside down. Therefore, when inspecting and repairing each circulation fan, the circulation fan removed from the top of the heat treatment furnace may be turned upside down and attached to the bottom, or the circulation fan removed from the bottom of the heat treatment furnace may be turned upside down and attached to the top.

[0016] FIG. 1 is a diagram showing an example of a circulation fan 1 in this embodiment. The circulation fan 1 shown in FIG. 1 is connected to an actuator 2 such as a motor so as to be able to transmit torque, and the blades 3 rotate upon receiving the torque transmitted from the actuator 2. In addition, a flange 4 used when fixing the circulation fan 1 to a heat treatment furnace is formed on the outer periphery of the circulation fan 1, on the opposite side of the blades 3 in the height direction of the circulation fan 1. The flange 4 may be provided continuously around the entire outer periphery of the circulation fan 1, or at regular intervals in the circumferential direction of the outer periphery of the circulation fan 1. The circulation fan 1 may be fixed to the heat treatment furnace by screws or bolts. For this reason, the flange 4 has screw holes or bolt holes (not shown), and the flange 4 is fixed to the heat treatment furnace by screws or bolts using the screw holes or bolt holes.

[0017] In the following description, the position of the circulation fan 1 in which the blades 3 are located above the flange 4 will be referred to as "upward," and the position of the circulation fan 1 in which the blades 3 are located below the flange 4 will be referred to as "downward." The circulation fan 1 is installed in the upper part of the heat treatment furnace in the downward position, and installed in the lower part of the heat treatment furnace in the upward position.

[0018] In addition, at each of the ends of the circulation fan 1 on the flange 4 side and the blade 3 side, there are multiple locking portions (not shown) for engaging the hook of a crane when hoisting the circulation fan 1 with a crane.

[0019] FIG. 2 is a diagram showing an example of the inversion device 5 according to the present embodiment. FIG. 3 is a view seen from the arrow A in FIG. 2, FIG. 4 is a view seen from the arrow B in FIG. 2, and FIG. 5 is a view seen from the arrow C in FIG. 2. The inversion device 5 shown in FIGS. 2 to 5 has a base 6, a power unit 7, and a support member 8. The base 6 is a box-shaped member made of a plurality of square timbers, and is configured to rotate around a rotation center axis along the horizontal direction upon receiving torque transmitted from the power unit 7. Specifically, as shown in FIGS. 2 and 3, a rotating shaft 9 that rotates around the above-mentioned rotation center axis is provided on each side of the base 6. Each rotating shaft 9 is installed on a base 11 via a bearing 10. The power unit 7 is connected to one of the rotating shafts 9 so that torque can be transmitted to it. In addition, in FIGS. 2 to 5, the circulation fan 1 fixed to the base 6 in a downward direction is depicted by a dotted line.

[0020] The power unit 7 has a power source 16 and a reducer that amplifies the torque generated by the power source 16 and transmits it to the rotating shaft 9. The reducer is preferably, for example, a worm reducer 17 having a self-locking function. This is to prevent the rotating shaft 9 from rotating independently of the torque generated by the power source 16. The power source 16 is connected to the rotating shaft 9 via the worm reducer 17. Examples of the power source 16 include a motor, an electric tool such as an impact wrench, and a hand tool such as a wrench. Note that Figs. 2, 4, and 5 show a state in which the circulation fan 1 is inserted and fixed in the insertion portion 12 in a downward state, and the rotation of the stand 6 is stopped by the self-locking function.

[0021] In the example shown in FIG. 2 to FIG. 5, the base 6 forms an insertion portion 12 into which the circulation fan 1 is inserted. The insertion portion 12 is configured to insert the circulation fan 1 along an axis (vertical direction in FIG. 2) perpendicular to the rotation center axis of the base 6. That is, the base 6 is formed in a cylindrical shape, and the inside thereof is the insertion portion 12. The inner diameter of the insertion portion 12 is set to be larger than the outer diameter of the circulation fan 1. Here, the "inner diameter of the insertion portion 12" means the inner diameter of the insertion portion 12 when the insertion portion 12 is cylindrical, and means the inner diameter of an inscribed circle inscribed in the insertion portion 12 when the insertion portion 12 is other than cylindrical. Moreover, the "outer diameter of the circulation fan 1" means the outer diameter of the part of the circulation fan 1 with the largest diameter, and in this embodiment means the outer diameter of the flange 4 of the circulation fan 1.

[0022] FIG. 6 is an enlarged view of a part of the reversing device 5 shown in FIG. 2. As shown in FIG. 6, FIG. 2, and FIG. 3, a mounting flange 14 of the support member 8 is provided on the peripheral portion 13 on one end (upper end in FIG. 2) side of the pedestal 6 forming the insertion portion 12 in the vertical direction of the insertion portion 12, i.e., in the axial direction perpendicular to the rotation center axis of the pedestal 6. The mounting flange 14 is provided so as to protrude inward in the radial direction of the insertion portion 12. Here, the above-mentioned "radial direction" means the radial direction of the insertion portion 12 when the insertion portion 12 is cylindrical, and means the radial direction of the inscribed circle inscribed in the insertion portion 12 when the insertion portion 12 is other than cylindrical. The mounting flanges 14 are provided at regular intervals along the circumferential direction of the peripheral portion 13 of the pedestal 6, and in the example shown here, a total of four mounting flanges 14 are provided at every 90° on the peripheral portion 13 of the pedestal 6. The diameter of an inscribed circle (not shown) inscribed in these mounting flanges 14 is set to be larger than the outer diameter of the circulation fan 1. The above-mentioned mounting flange 14 is not provided on the peripheral portion 15 of the stand 6 on the other end side (the lower end side in FIG. 2) in the vertical direction of the insertion portion 12. Therefore, the inner diameter of the peripheral portion 13 on one end side in the vertical direction of the insertion portion 12 is smaller than the inner diameter of the peripheral portion 15 on the other end side in the vertical direction of the insertion portion 12 by the amount of the mounting flange 14. Also, the above-mentioned mounting flange 14 corresponds to the "portion of the stand facing the outer periphery of the object to be inverted" in this embodiment.

[0023] In addition, it is preferable that the shape of the base 6 and the position of the insertion part 12 in the base 6 are set so that the center of gravity of the base 6 and the center of gravity of the circulation fan 1 fixed to the base 6 are located on the rotation central axis of the base 6. This can be determined in terms of design. In this way, it is possible to prevent the base 6 from rotating due to the deviation of the positions of the above-mentioned centers of gravity from the rotation central axis of the base 6. In addition, since the centers of gravity are located on the rotation central axis, the base 6 can be rotated smoothly.

[0024] It is preferable that the length of insertion portion 12 in the up-down direction, i.e., in the axial direction perpendicular to the central axis of rotation of stand 6, is set to approximately the same length as the length between blades 3 and flange 4 in the height direction of circulation fan 1. By doing so, when circulation fan 1 is inserted into insertion portion 12, flange 4 of circulation fan 1 and mounting flange 14 of insertion portion 12 can be adjacent to each other, and flange 4 and mounting flange 14 can be connected to each other via support member 8.

[0025] In the example shown in FIG. 2 and FIG. 6, the other end (outer end) of the support material 8 is detachably fixed to the lower side of the mounting flange 14 in the vertical direction of the reversing device 5. The connection between the mounting flange 14 and the support material 8, i.e., the fixing of the support material 8 to the frame 6, may be by screwing or bolting. For this reason, the mounting flange 14 is formed with screw holes and bolt holes (not shown). Then, as described later, the other end of the support material 8 is screwed or bolted to the lower side of the mounting flange 14 using the screw holes and bolt holes. In a state in which the other end (outer end) of the support material 8 is fixed to the mounting flange 14, the other end (outer end) of the support material 8 is located inside the peripheral part of the frame 6 in the radial direction of the insertion part 12, and one end (inner end) of the support material 8 is located inside the other end (outer end) of the insertion part 12 in the radial direction. In addition, when fixed to the mounting flange 14 , the diameter of an inscribed circle (not shown) inscribed in the support material 8 is set to be smaller than the outer diameter of the circulation fan 1 .

[0026] 2 and 6, the flange 4 of the circulation fan 1 is placed on the upper side of one end (inner end) of the support material 8, and they are fixed with screws or bolts. In other words, one end of the support material 8 is detachably fixed to the lower side of the flange 4 of the circulation fan 1.

[0027] The support material 8 is a plate-shaped member, and screw holes and bolt holes are formed at both ends of the support material 8. Screw holes and bolt holes similar to the screw holes and bolt holes formed at both ends of the support material 8 are also formed in the flange 4 of the circulation fan 1 and the mounting flange 14 of the frame 6. The screw holes and bolt holes formed at one end of the support material 8 are aligned with the screw holes and bolt holes formed in the flange 4 of the circulation fan 1, and bolts are inserted into the screw holes and bolt holes to detachably connect them. The screw holes and bolt holes formed at the other end of the support material 8 are aligned with the screw holes and bolt holes formed in the mounting flange 14, and bolts are inserted into the screw holes and bolt holes to detachably connect them.

[0028] In this embodiment, the other end of the support material 8 is screwed or bolted to the lower side of the mounting flange 14 in the vertical direction (height direction) of the inversion device 5 shown in FIG. 2. The number of mounting flanges 14 and supports 8 is not limited to four, and may be two, three, or five or more. The more mounting flanges 14 and supports 8, the more stable the circulation fan 1 can be supported, which is preferable. Also, the mounting flanges 14 and supports 8 may be formed into an annular shape and attached along the periphery of the frame 6. This also allows the circulation fan 1 to be fixed to the frame 6 via the mounting flanges 14 and supports 8.

[0029] (Inversion method) A method for inverting the downward-facing circulation fan 1 to face upward will now be described. FIG. 7 is a flow chart showing an example of the inversion method according to this embodiment. First, as shown in FIG. 2, the inversion device 5 is fixed in a state in which the mounting flange 14 is located above the inversion device 5 in the up-down direction of the inversion device 5. As described above, the inversion device 5 is fixed by the self-locking function of the worm reducer 17. In this state, the other end of the support material 8 is connected to the underside of the mounting flange 14 with a bolt (hereinafter referred to as the outer bolt).

[0030] At the same time, a hook of a crane (not shown) is hooked onto the locking portion at the end of the circulation fan 1 on the flange 4 side to hoist the circulation fan 1. The circulation fan 1 is then moved to the stand 6 by the crane, and the circulation fan 1 is inserted from above facing downward into the insertion portion 12. As described above, the diameter of the inscribed circle (not shown) inscribed in the support material 8 is smaller than the outer diameter of the circulation fan 1, so that when the circulation fan 1 is inserted into the insertion portion 12, the flange 4 of the circulation fan 1 inserted into the insertion portion 12 is placed on one end of the support material 8 (step S1, placement process).

[0031] After that, one end of the support material 8 and the flange 4 of the circulation fan 1 are connected to each other with a bolt (hereinafter referred to as the inner bolt). In this way, the circulation fan 1 is fixed to the frame 6 via the support material 8 (step S2, fixing process). Figure 2 shows this state.

[0032] Next, the crane hook that was hooked onto the locking portion of the circulation fan 1 is removed. After that, the power unit 7 is operated to rotate the base 6 around the central axis of rotation. In this way, the circulation fan 1 is turned upside down (step S3, inversion process). The determination that the circulation fan 1 has been turned upside down may be made by a control device (not shown) or by an operator. Then, almost simultaneously with the completion of the inversion of the circulation fan 1, the rotation of the base 6 by the power unit 7 is stopped. In this state, the circulation fan 1 is facing upwards, and the rotating shaft 9 is locked by the self-locking function of the worm reducer 17.

[0033] By inverting the circulation fan 1 as described above, the blades 3 of the circulation fan 1 are positioned above the flange 4. FIG. 8 shows this state. A crane hook is hooked onto the locking portion of the end of the circulation fan 1 on the blade 3 side shown in FIG. 8. In conjunction with this, the outer bolt that connects the other end of the support material 8 to the mounting flange 14 is removed. In this state, the circulation fan 1 is lifted up by the crane and pulled out upward from the insertion portion 12, and the circulation fan 1 is moved to a predetermined location (step S4, moving step). That is, the circulation fan 1 is pulled out from the other end side of the base 6 opposite to the one end side where the circulation fan 1 was inserted into the insertion portion 12 in the above-mentioned step S1. As described above, the other end (outer end) of the support material 8 is located inside the peripheral portion of the base 6 in the radial direction of the insertion portion 12, so that the circulation fan 1 can be pulled out upward from the base 6 even if the support material 8 is fixed to the circulation fan 1. Thereafter, the inner bolts connecting the flange 4 of the circulation fan 1 to one end of the support 8 are removed, and the support 8 is removed from the circulation fan 1.

[0034] As described above, according to this embodiment, when the circulation fan 1 is reversed using the reversing device 5, the base 6 and the circulation fan 1 are fixed via the support material 8 and the mounting flange 14. Therefore, after the circulation fan 1 is reversed, if the support material 8 is removed from the mounting flange 14, the circulation fan 1 can be lifted and pulled upward from the base 6 without hooking the circulation fan 1 on the base 6. Therefore, whether the circulation fan 1 is before or after being reversed, the circulation fan 1 can be stably and safely lifted by a crane. In addition, the self-locking mechanism of the worm reducer 17 can suppress unexpected rotation of the rotating shaft 9. Furthermore, since the power source 16 of the power unit 7 and the rotating shaft 9 are connected to each other via the worm reducer 17 so that torque can be transmitted, the torque of the power source 16 can be increased and transmitted to the rotating shaft 9. Therefore, the base 6 can be rotated with a torque smaller than ever before, and for example, the base 6 can be rotated manually.

[0035] In the above-described inversion device 5 and inversion method according to the present embodiment, an example has been described in which the downward-facing circulation fan 1 is inverted to face upward, but the upward-facing circulation fan 1 can also be inverted to face downward. In that case, first, as shown in Fig. 8, the inversion device 5 is fixed in a state in which the mounting flange 14 is located below the inversion device 5 in the up-down direction of the inversion device 5. The inversion device 5 is fixed by the self-locking function of the worm reducer 17.

[0036] Furthermore, one end of the support material 8 is placed on the flange 4 of the upward-facing circulation fan 1, and they are connected by an inner bolt. After that, the upward-facing circulation fan 1 is lifted by a crane and inserted from above into the insertion portion 12 of the base 6. In this way, the other end of the support material 8 is placed on the mounting flange 14, and they are connected by an outer bolt. After that, the base 6 is rotated in the same manner as in the above-mentioned embodiment to turn the circulation fan 1 upside down. As a result, the circulation fan 1 faces downward as shown in FIG. 2.

[0037] After the circulation fan 1 has been turned over, the inner bolts connecting the circulation fan 1 to the support member 8 are removed, releasing the fixed state of the circulation fan 1. Next, the circulation fan 1 is hoisted by a crane and the downward-facing circulation fan 1 is pulled upward out of the insertion portion 12. In this way, the upward-facing circulation fan 1 can be turned over to face downward.

[0038] The present invention is not limited to the above-described embodiment. For example, the flange 4 may be formed at or near the center of the circulation fan 1 in the height direction of the circulation fan 1, or on the blade 3 side in the height direction of the circulation fan 1. In this case, it is sufficient that the mounting flange 14 is provided at a position on the base 6 that faces the flange 4 of the circulation fan 1 inserted into the insertion portion 12. Even with such a configuration, it is possible to obtain substantially the same functions and effects as the above-described embodiment.

[0039] The present invention can also be applied to the inversion of an object to be inverted that does not have a flange. In this case, by attaching support material 8 to the outermost periphery of the object to be inverted, the object to be inverted can be inverted in a manner similar to that of the present embodiment described above. [Explanation of symbols]

[0040] 1 Circulation fan (an example of an object to be inverted) 2 Actuators 3. Feather 4 Flanges 5. Inversion device 6 Mounting stand 7 Power section 8 Support material 9 Rotation Axis 10. Bearings 11 Pedestal 12 Insertion part 13 Periphery of one end of the stand 14 Mounting flange 15 Periphery of the other end of the stand 16 Power source 17 Worm reducer S1 Placement process S2 Fixed process S3 Reversal process S4 Moving process

Claims

1. An inversion device that inverts an object to be inverted upside down, a stand that forms an insertion portion into which the inversion object is inserted and rotates about a rotation center axis along a horizontal direction; A power unit connected to the base so as to be capable of transmitting torque; a support member that connects an outer periphery of the object to be turned over inserted into the insertion portion and a portion of the stand that faces the outer periphery of the object to be turned over to fix the object to the stand, The inner diameter of the insertion portion is larger than the outer diameter of the object to be turned over, The object to be inverted is an inversion device that is inserted into the insertion portion from above.

2. A flange is provided on the outer periphery of the object to be turned over, A mounting flange is provided on a portion of the frame facing an outer periphery of the object to be inverted, the mounting flange protruding inward in a radial direction of the insertion portion, 2. The inversion device according to claim 1, wherein one end of the support is connected to the underside of the flange, and the other end of the support is connected to the underside of the mounting flange.

3. The inversion device according to claim 1 , wherein the support member is formed in a plate shape.

4. 4. The reversing device according to claim 1, wherein the power unit has a reducer that increases the torque.

5. 5. The inversion device according to claim 4, wherein the reducer is a worm reducer.

6. A method for inverting an object to be inverted, comprising the steps of: a placing step of inserting an object to be turned from above into an insertion portion formed by a stand and placing an outer periphery of the object to be turned on one end of a support material having the other end connected to the stand; a fixing step of connecting one end of the support material to an outer periphery of the object to be turned over to fix the object to the stand via the support material; an inversion step of inverting the object to be inverted upside down by rotating the stand about a central axis of rotation along a horizontal direction; An inversion method comprising: a moving step of inverting the object to be inverted upside down, disconnecting the other end of the support material from the stand to release the fixation of the object to be inverted to the stand via the support material, and moving the object to be inverted above the stand.

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