JP-2026074526-A - Workpiece reversing device and workpiece welding method

Abstract

[Problem] The present invention aims to provide a workpiece inversion device that is simple in structure, inexpensive, and allows for safe operation. [Solution] The workpiece reversing device 1 of the present invention comprises an L-shaped frame 3 having mutually orthogonal workpiece mounting surfaces 2, a base 5 that pivotally supports shafts 4 provided at the corners of the L-shaped frame 3, and a drive device 6 that rotates the L-shaped frame 3 so that the workpiece mounting surfaces 2 become a plane perpendicular to the horizontal plane, wherein the height of the horizontal workpiece mounting surface 2 from the floor is set to a height at which an operator M can work on a workpiece W placed on the horizontal workpiece mounting surface 2 from the floor. [Selection Diagram] Figure 1

Inventors

• 北浦 一郎
• 幸地 良祐

Assignees

• パスカルエンジニアリング株式会社

Dates

Publication Date

20260507

Application Date

20241021

Claims (6)

1. An L-shaped frame having mutually orthogonal workpiece mounting surfaces, A base that pivotally supports the shaft portion provided at the corner of the L-shaped frame, The system includes a drive device that rotates the L-shaped frame so that the workpiece mounting surface becomes perpendicular to the horizontal plane, A workpiece inversion device in which the height of the horizontal workpiece mounting surface from the floor is set to a height at which an operator can work on a workpiece placed on the horizontal workpiece mounting surface from the floor.
2. The workpiece reversing device according to claim 1, wherein the drive device comprises a motor that rotates the shaft portion.
3. The workpiece reversing device according to claim 1, wherein the drive device has a cylinder device connected to the L-shaped frame on the base.
4. Multiple workpiece reversing devices are arranged to support multiple points along the longitudinal direction of the workpiece. The workpiece reversing device according to claim 2, wherein a drive connecting shaft is provided for connecting the adjacent shaft portions of the plurality of workpiece reversing devices.
5. The workpiece reversing device according to claim 4, wherein the workpiece is a long steel frame and the operation is a welding operation.
6. A process of placing a workpiece on one of two mutually orthogonal workpiece mounting surfaces of an L-shaped frame and performing a welding operation on the workpiece, The process involves inverting the L-shaped frame by -90 degrees and placing the workpiece on the other workpiece mounting surface, After lifting the workpiece from the other workpiece mounting surface, the L-shaped frame is rotated 90 degrees. A step of placing the workpiece on one of the workpiece mounting surfaces, A method for welding a workpiece, comprising the steps of: inverting the L-shaped frame by -90 degrees, placing the workpiece on the other workpiece mounting surface, and performing a welding operation on the workpiece.

Description

This invention relates to a workpiece reversing device and a workpiece welding method. Traditionally, the inversion of large H-beams and other structural steel sections required the use of two cranes and at least two workers, making it a dangerous operation. As an example of a device that uses a reversing mechanism to invert a workpiece, the one described in Japanese Patent Publication No. 2003-25093 (Patent Document 1) has been proposed. This conventional reversing device consisted of a pair of rotating frames, each driven to rotate around the same axis by a frame rotation device. The rotating frames held both ends of a long steel column, and the rotating frames were rotated by the respective frame rotation devices during welding of the middle section of the steel column. Japanese Patent Publication No. 2003-25093 Figure 1 is a perspective view showing a factory layout in which multiple workpiece reversing devices according to the first embodiment of the present invention are installed.Figure 2 is a side view of the workpiece reversing device shown in Figure 1.Figure 3 is an explanatory diagram of the drive mechanism.Figure 4 is a process diagram of the welding method using the workpiece reversing device of the first embodiment.Figure 5 is a front view showing a second embodiment of the present invention.Figure 6 is a cross-sectional view taken along line C-C in Figure 5.Figure 7 is a perspective view showing a second embodiment of the present invention.Figure 8 shows a factory layout with multiple workpiece reversing devices of the second embodiment installed, and is a plan view of Figure 9(a).Figure 9 is an explanatory diagram of the operation of the workpiece reversing device shown in Figure 8.Figure 10 is a plan view of the factory layout in Figure 8(d). The embodiments of the present invention will be described below with reference to the drawings. Figures 1 to 4 relate to the first embodiment of the present invention. The workpiece reversing device 1 has an L-shaped frame 3 with mutually orthogonal workpiece mounting surfaces 2. A shaft portion 4 is provided at the corner of this L-shaped frame 3. A base 5 that pivotally supports this shaft portion 4 is installed on the floor. A drive device 6 is provided to rotate the L-shaped frame 3 so that the workpiece mounting surfaces 2 become perpendicular to the horizontal plane. The height of the horizontal workpiece mounting surface 2 from the floor is set so that a worker M can work on the workpiece W placed on the horizontal workpiece mounting surface 2 from the floor. Furthermore, when the workpiece W is being lifted by the crane 7, the height is set so that a worker M can perform the rigging operation on the workpiece W on the workpiece mounting surface 2 from the floor. The drive unit 6 has a motor 8 that rotates the shaft portion 4. The motor 8 and the shaft portion 4 of the L-shaped frame 3 are interlocked and connected by a drive shaft 9. This drive shaft 9 is interlocked and connected to the output shaft 10 of a reduction gear directly connected to the motor 8 by a sprocket-chain transmission device 11 (see Figure 3). The drive unit 6 has a control panel 12 that controls the rotation of the motor 8. In this embodiment, the workpiece W is a long steel frame, specifically a large, elongated H-beam with dimensions of approximately 500 mm (thickness) x 1250 mm (width) x 15000 mm (length). The workpiece mounting surface 2 is large enough to accommodate such a workpiece W. The lengths from the L-shaped corners to the ends of the two workpiece mounting surfaces 2 are the same. The work performed by the worker M is welding or similar operations. Multiple workpiece reversing devices 1 are arranged to support multiple points along the longitudinal direction of the workpiece W. In this embodiment, three workpiece reversing devices 1 are arranged. A drive connecting shaft (not shown) is provided to connect the adjacent shaft portions 4 of the multiple workpiece reversing devices 1. Therefore, the L-shaped frames 3 of the three workpiece reversing devices 1 rotate synchronously around the shaft portions 4 due to the rotation of the motor 8 of the drive device 6. Figure 4 shows the work process of the workpiece reversal device 1 in Figure 1. That is, it is an embodiment of the workpiece welding method of the present invention. Figure 4(a) shows step 1, in which a workpiece W is placed on one of the two workpiece mounting surfaces 2 of the L-shaped frame 3, and welding is performed on the workpiece W. First, the workpiece W, which has been lifted by the overhead crane 7, is placed on one of the workpiece mounting surfaces 2 of the L-shaped frame 3. For convenience, the horizontal workpiece mounting surface 2 is referred to as the first workpiece mounting surface 2a, and the vertical workpiece mounting surface 2 is referred to as the second workpiece mounting surface 2b. Furthermore, the upper surface of the workpiece W placed on the first mounting surface 2a is