Flange forming device for circular pipes

Abstract

The present invention relates to a flange forming device for a circular pipe. The flange forming device for a circular pipe of the present invention is characterized in that it includes: a forming fixture, which is configured in the form of surrounding the outer peripheral surface of the lower end portion of the pipe and has a forming groove on the surface facing the pipe; a support part, which is used to support the lower end of the pipe below the forming fixture; a height adjustment part, which is used to adjust the height of the support part; and a forming part, which is used to hit the inner peripheral surface of the lower end portion of the pipe, thereby forming a flange with a shape corresponding to the forming groove of the forming fixture on the lower end portion of the pipe, wherein the forming groove includes a first forming surface formed on the surface facing the pipe and a second forming surface further extended from the end portion of the first forming surface, and the height adjustment part is used to adjust the relative position of the support part relative to the forming fixture so that the flange can be formed only on the first forming surface, or the flange can be formed on the first forming surface and the second forming surface.

Description

Technical Field

[0001] The present invention relates to a flange forming device for a circular pipe, and more particularly, to a flange forming device for a circular pipe that can form flanges of different shapes at both ends of the pipe by a single device, wherein the flanges are used to connect the pipes. Background Art

[0002] Generally speaking, ducts are air cylinders made up of pipe connections that are used by users of public facilities, residential areas, underground shopping malls, etc. to protect their respiratory organs from indoor pollutants such as dust, carbon dioxide, and harmful bacteria, and for ventilation and air circulation. They refer to the part of the air conditioning system structure that is made up of pipe connections.

[0003] This type of pipeline is designed in consideration of the convenience and appearance of the facility, so its structure is complex and diverse, and the structure of the pipeline also becomes complex and diverse.

[0004] As described above, as the structure of facilities becomes more complex, pipe manufacturers make pipes into various forms such as circular pipes, T-shaped pipes, Y-shaped pipes, and elbow-shaped pipes, taking into account the purpose, location, and size of the pipes.

[0005] Patent Document 1 (Korean Patent Publication No. 10-0846878) relates to a flange forming apparatus for a circular pipe, which can accurately bend both end portions of a circular pipe for the pipe into right angles.

[0006] Generally speaking, in order to connect the unit elements of the pipeline, it is necessary to form a first-shaped flange consisting of horizontal elements at one end of the pipeline, and a second-shaped flange consisting of horizontal and vertical elements at the other end of the pipeline, and then connect the first-shaped flange and the second-shaped flange of the unit elements of a pair of adjacent pipelines.

[0007] However, the molding device of the prior art has the following problem: it can only mold a first-shaped flange composed of horizontal elements, so the second-shaped flange with horizontal and vertical elements used for pipe connection must be molded in another molding device.

[0008] That is, the forming device of Patent Document 1 forms a first-shaped flange on one end of a pipe, moves the formed pipe to a forming device installed in another location, and then forms a second-shaped flange in the forming device. Therefore, it not only takes up a large space but also has the problem of reduced production efficiency. Summary of the Invention

[0009] Problems to be solved by the invention

[0010] The present invention is proposed to solve the above-mentioned previous problems, and its purpose is to provide a flange forming device for a circular pipe, which can form flanges of different shapes respectively formed at the two ends of the pipe through a single device, wherein the flanges are used to connect the pipes.

[0011] Furthermore, an object of the present invention is to provide a flange forming device for a circular pipe, in which a support portion for determining a lower end position of the pipe can be stably raised and lowered.

[0012] In addition, an object of the present invention is to provide a flange forming device for a circular pipe, in which the fixing part and the forming fixture are divided into multiple structures, and when the pipe is fixed, the multiple fixing parts and the multiple forming fixtures are tightly attached to each other to guide the fixed position of the pipe, thereby preventing deformation of the pipe shape caused by the fixing pressure of the fixing part.

[0013] Solutions for solving problems

[0014] The above-mentioned purpose is achieved by the flange forming device of a circular pipe of the present invention, which is characterized in that it includes: a forming fixture, which is configured in the form of surrounding the outer peripheral surface of the lower end portion of the pipe and has a forming groove on the surface facing the pipe; a support part, which supports the lower end of the pipe below the forming fixture; a height adjustment part, which is used to adjust the height of the support part; and a forming part, which is used to hit the inner peripheral surface of the lower end portion of the pipe, thereby forming a flange of a shape corresponding to the forming groove of the forming fixture on the lower end portion of the pipe, the forming groove including a first forming surface formed on the surface facing the pipe and a second forming surface further extended on the end portion of the first forming surface, and the height adjustment part is used to adjust the relative position of the support part relative to the forming fixture so that the forming of the flange can be completed only on the first forming surface, or the forming of the flange can be completed on the first forming surface and the second forming surface.

[0015] Here, the height adjustment unit preferably includes: a plurality of lifting support frames arranged with the pipe as the center, the upper ends of the lifting support frames supporting the lower portion of the support unit; a connecting shaft arranged in a direction intersecting the lifting support frames and used to connect a pair of adjacent lifting support frames; and a driving motor for providing a rotational driving force to the connecting shaft.

[0016] The lifting support frame is supported in a state in which it can be lifted and lowered, and the connecting shaft is supported in a state in which it can be rotated. A rack and a pinion that mesh with each other are formed at a connection portion between the connecting shaft and the lifting support frame.

[0017] Furthermore, it is preferable that the first molding surface is formed in a direction intersecting the longitudinal direction of the duct, and the second molding surface is formed in a direction parallel to the longitudinal direction of the duct.

[0018] Furthermore, it is preferred to include: a fixing portion for selectively fixing the pipe on the forming fixture.

[0019] Furthermore, it is preferred that the molding jig and the fixing portion be divided into a plurality of parts.

[0020] At the position where the pipe is fixed, the side surfaces of the divided forming clamps and the side surfaces of the fixing parts are in close contact with each other, so as to guide the fixing position of the pipe.

[0021] Furthermore, the fixing portion preferably includes: a pipe fixing frame capable of supporting an outer side surface of the pipe; a guide for movably supporting the pipe fixing frame in a radial direction of the pipe; and an actuator for moving the pipe fixing frame.

[0022] In addition, the forming part preferably includes: a forming tool, which circles around the inner circumference of the pipe and strikes the inner circumference of the pipe at a position corresponding to the forming groove to form a flange; and a power mechanism, which provides power for rotating, moving forward and backward the forming tool.

[0023] Effects of the Invention

[0024] According to the present invention, a flange forming device for a circular pipe is provided, which can form flanges of different shapes respectively formed at both ends of the pipe by a single device, wherein the flanges are used for connecting pipes.

[0025] Furthermore, a flange forming device for a circular pipe is provided, in which a support portion for determining a lower end position of the pipe can be stably raised and lowered.

[0026] In addition, a flange forming device for a circular pipe is provided, in which the fixing part and the forming fixture are divided into multiple structures. When the pipe is fixed, the multiple fixing parts and the multiple forming fixtures are tightly attached to each other so that the fixed position of the pipe is guided, thereby preventing deformation of the pipe shape caused by the fixing pressure of the fixing part. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional diagram of the flange forming device for a circular pipe of the present invention.

[0028] Figure 2 It is an extracted three-dimensional view showing the main structure of the flange forming device for a circular pipe of the present invention.

[0029] Figure 3 It is an extracted three-dimensional view of the fixing portion and the forming fixture in the flange forming device for a circular pipe of the present invention.

[0030] Figure 4 It is an extracted three-dimensional view of the height adjustment part in the flange forming device for a circular pipe of the present invention.

[0031] Figure 5 It is an exploded perspective view of a forming portion in a flange forming device for a circular pipe according to the present invention.

[0032] Figure 6 It is a cross-sectional view of a flange forming device for a circular pipe according to the present invention.

[0033] Figure 7 This is a diagram showing a state in which the support portion of the circular pipe flange forming device of the present invention has moved to the first position.

[0034] Figure 8 This is a diagram showing a state where a pipe is fixed by a fixing portion in the flange forming apparatus for a circular pipe according to the present invention.

[0035] Figure 9 This is a diagram showing a state where a flange having a first shape is formed by a forming section in the flange forming apparatus for a circular pipe according to the present invention.

[0036] Figure 10 This is a diagram showing a state in which the fixing portion of the circular pipe flange forming apparatus according to the present invention has released the fixing of the pipe.

[0037] Figure 11 This is a diagram showing a state in which the support portion of the circular pipe flange forming device of the present invention has moved to the second position.

[0038] Figure 12 This is a diagram showing the function of the height adjustment portion in the circular pipe flange forming device of the present invention.

[0039] Figure 13 This is a diagram showing a state where a flange having a second shape is formed by a forming section in the flange forming apparatus for a circular pipe according to the present invention.

[0040] Figure 14 This is a diagram showing a pipe after flange forming is completed by the flange forming device for a circular pipe of the present invention.

[0041] Description of reference numerals:

[0042] 111 First base 111a Through hole

[0043] 112 Second base 120 Fixing portion

[0044] 121 Pipe fixing bracket 122 Guide

[0045] 123 actuator 130 support portion

[0046] 131 mounting portion 140 height adjustment portion

[0047] 141 lifting support frame 141a rack

[0048] 142 connecting shaft 142a pinion

[0049] 143 drive motor 144 housing

[0050] 150 molding fixture 151 first molding surface

[0051] 152 second molding surface 160 molding portion

[0052] 161 Forming Tool D Pipe

[0053] F1 first shape flange F2 second shape flange DETAILED DESCRIPTION

[0054] Before describing the present invention, it should be noted that in multiple embodiments, the same figure marks are used for components with the same structure, and a representative description is given in the first embodiment, while structures different from the first embodiment are described in other embodiments.

[0055] Hereinafter, a flange forming device for a circular pipe according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0056] In the accompanying drawings, Figure 1 This is a three-dimensional diagram of the flange forming device for a circular pipe according to the present invention. Figure 2 This is an extracted perspective view showing the main structure of the flange forming device for a circular pipe according to the present invention. Figure 3 This is an extracted three-dimensional diagram of the fixing portion and the forming fixture in the flange forming device for a circular pipe according to the present invention. Figure 4 This is an excerpted three-dimensional view of the height adjustment portion of the flange forming device for a circular pipe according to the present invention. Figure 5 It is an extracted three-dimensional view of the forming part in the flange forming device for a circular pipe of the present invention.

[0057] As shown in the above figures, the flange forming device for a circular pipe of the present invention includes a base, a fixing portion 120 , a supporting portion 130 , a height adjusting portion 140 , a forming fixture 150 and a forming portion 160 .

[0058] The base includes a first base 111 having a through hole 111 a formed at the center thereof and a second base 112 disposed below the through hole 111 a of the first base 111 . The first base 111 and the second base 112 are connected by a plurality of column members.

[0059] The fixing portion 120 is used to selectively fix the pipe D. There are a plurality of fixing portions 120 , which are radially arranged around the through hole 111 a on the upper side of the first base 111 .

[0060] The fixing portion 120 includes a pipe fixing frame 121 that supports the outer surface of the pipe D; a guide 122 that supports the pipe fixing frame 121 on the first base 111 so that the pipe fixing frame 121 can move radially along the pipe D; and an actuator 123 for moving the pipe fixing frame 121. The guide 122 can be constructed by two or more rows of linear motion (LM) guides arranged side by side, and the actuator 123 can be constructed by a pneumatic cylinder whose cylinder rod is compressed or extended by air. Therefore, when the actuator 123 is driven to extend, the pipe fixing frame 121 pressurizes and supports the outer surface of the pipe D, securing it. When the actuator 123 is driven to retract, the pipe fixing frame 121 moves away from the outer surface of the pipe D, releasing its fixation.

[0061] Furthermore, the pipe fixing brackets 121 have arcuate contact surfaces that support the outer side surfaces of the pipes D. When the multiple pipe fixing brackets 121 are advanced and support the outer side surfaces of the pipes D, the side surfaces of the pipe fixing brackets 121 contact the side surfaces of adjacent pipe fixing brackets 121. This ensures that the fixed positions of the pipes D are consistently aligned and prevents deformation of the outer shape of the pipes D due to the fixing pressure of the fixing portion 120. Specifically, when the side surfaces of the multiple pipe fixing brackets 121 are in contact with each other, the space enclosed by the multiple pipe fixing brackets 121 is configured to correspond to the outer shape of the pipes D.

[0062] The forming jig 150 has a forming groove on its surface facing the pipe D and is positioned below the pipe fixing frame 121 so as to surround the outer circumference of the lower end of the pipe D. In this embodiment, the forming jig 150 is divided into a number corresponding to the number of fixing portions 120 , and each of the divided forming jigs 150 is positioned between the pipe fixing frame 121 of the fixing portion 120 and the actuator 123 , thereby moving along the guide 122 together with the pipe fixing frame 121 .

[0063] The molding groove comprises a first molding surface 151 extending horizontally from the surface facing the pipe D, intersecting the longitudinal direction of the pipe D; and a second molding surface 152 extending vertically parallel to the longitudinal direction of the pipe D at the distal end of the first molding surface 151. The molding groove as a whole is generally L-shaped. Therefore, the flange F1 molded on the first molding surface 151 has a first shape consisting solely of horizontal elements, while the flange F2 molded on the first molding surface 151 and the second molding surface 152 has a second shape consisting of both horizontal and vertical elements.

[0064] The support portion 130 includes an arc-shaped mounting portion 131 arranged below the forming fixture 150 to support the lower end of the pipe D. There are multiple mounting portions 131 and they are respectively arranged on both sides below the forming fixture 150. A separation space is provided between the mounting portions 131 on both sides for configuring a forming tool 161 of the forming portion 160.

[0065] The height adjustment portion 140 is disposed between the second base 112 and the support portion 130 and is used to adjust the height of the support portion 130 supporting the lower end of the pipe D. The relative position of the lower end of the pipe D relative to the forming fixture 150 can be determined by the position of the support portion 130.

[0066] This height adjustment part 140 includes: a plurality of lifting support frames 141 whose upper ends support the lower part of the support part 130; a connecting shaft 142 arranged in a direction intersecting the lifting support frames 141 and connecting a pair of adjacent lifting support frames 141; a driving motor 143 that provides rotational driving force to the connecting shaft 142; and a shell 144 that surrounds the connection part of the lifting support frame 141 and the connecting shaft 142.

[0067] In addition, in the drawings of this embodiment, the support portion 130 is constructed by a plurality of mounting portions 131 . Therefore, although it is shown that the plurality of mounting portions 131 are supported by one plate, and the plate is raised and lowered by the height adjustment portion 140 , this is not limiting.

[0068] Furthermore, the lifting support frame 141 is supported on the housing 144 in a manner that allows it to be raised and lowered, and the connecting shaft 142 is supported on the housing 144 in a manner that allows it to be rotatable. A meshing rack 141a and a pinion 142a are provided at the connection between the connecting shaft 142 and the lifting support frame 141. Thus, the multiple lifting support frames 141 are interconnected via the connecting shafts 142. When one of the connecting shafts 142 rotates, the multiple lifting support frames 141 are linked together and rise or fall in unison, depending on the direction of rotation of the connecting shaft 142.

[0069] In addition, a speed reducer may be disposed between the driving motor 143 and the connecting shaft 142 to reduce the rotation speed of the driving motor 143 and increase the driving torque.

[0070] The forming part 160 is used to strike the inner circumference of the lower end portion of the pipe D to form flanges F1 and F2 on the lower end portion of the pipe D in a shape corresponding to the forming groove of the forming fixture 150. The forming part 160 includes: a forming tool 161 that strikes the inner circumference of the pipe D at a position corresponding to the forming groove while circling around the inner circumference of the pipe D; and a power mechanism for rotating, advancing, and retreating the forming tool 161.

[0071] The power mechanism includes: a first rotating mechanism that rotates on the same axis as the center of the pipe D; a second rotating mechanism that is coaxial with the first rotating mechanism and has a different rotation speed from the first rotating mechanism; and a rotating shell that is rotated by the first rotating mechanism. The molding tool 161 is supported on the rotating shell so as to be able to move in a bidirectional linear manner, and is constructed to be able to circle along the inner circumference of the pipe D while being rotated by the first rotating mechanism, and to repeatedly strike the inner circumference of the pipe D while being moved forward and backward by the second rotating mechanism. The structure and function of this molding part 160 have been disclosed in Korean Patent No. 10-2016-0034581 (2016.03.30) and Korean Patent No. 10-2054442 (2019.12.10), so their detailed description is omitted.

[0072] That is, according to this embodiment, the height adjustment portion can be used to change the height of the support portion 130 to a first position and a second position. When the support portion 130 is moved to the first position, since the lower end portion of the pipe D is molded only on the first molding surface 151, a flange F1 having a first shape can be formed at the lower end of the pipe D. When the support portion 130 is moved to the second position, since the lower end portion of the pipe D is molded on the first molding surface 151 and the second molding surface 152, a flange F2 having a second shape can be formed at the lower end of the pipe D.

[0073] From now on, the operation of the first embodiment of the above-mentioned circular pipe flange forming device will be described.

[0074] In the accompanying drawings, Figure 6 is a cross-sectional view of a flange forming device for a circular pipe according to the present invention, Figure 7 1 is a diagram showing a state in which the support portion of the circular pipe flange forming device of the present invention has moved to the first position. Figure 8 This figure shows a state where a pipe is fixed by a fixing portion in the flange forming device for a circular pipe according to the present invention. Figure 91 is a diagram showing a state in which a flange having a first shape is formed by a forming portion of a flange forming device for a circular pipe according to the present invention. Figure 10 This figure shows a state in which the fixing portion of the circular pipe flange forming device of the present invention releases the fixing of the pipe. Figure 11 1 is a diagram showing a state in which the support portion of the circular pipe flange forming device of the present invention has moved to the second position. Figure 12 1 is a diagram showing the function of the height adjustment portion in the circular pipe flange forming device of the present invention. Figure 13 1 is a diagram showing a state in which a flange having a second shape is formed by a forming portion of the circular pipe flange forming device according to the present invention. Figure 14 This is a diagram showing a pipe after flange forming is completed by the flange forming device for a circular pipe of the present invention.

[0075] First, if Figure 6 As shown, a plurality of fixing parts 120 are arranged on the upper side of the first base 111 with the fixing area of the pipe D as the center. The upper and lower positions of the support part 130 can be adjusted by a height adjustment part 140 arranged between the second base 112 and the support part 130 below the fixing area of the pipe D. The forming fixture 150 is arranged in the form of surrounding the lower outer side of the fixing area of the pipe D, and the forming part 160 is arranged at a position corresponding to the forming fixture 150 in the center of the fixing area of the pipe D.

[0076] Before the pipe D is inserted into the fixing area of the pipe D, as the actuators 123 contract, the fixing parts 120 are Figure 7 As shown, the pipe fixing frame 121 is in a retracted state, so the pipe D can be inserted into the space between the multiple pipe fixing frames 121. If one end of the formed object, i.e., the pipe D, is inserted into the fixing area of the pipe D, the insertion length of the pipe D will be guided as the lower end of the pipe D is installed on the support part 130.

[0077] The support portion 130 can be moved to one of a first position and a second position through the height adjustment portion 140. Figure 6 and Figure 7 This shows a state where the support portion 130 has moved to the first position.

[0078] As described above, after the lower end of the pipe D is mounted on the support portion 130, the pipe D is fixed using the fixing portion 120. Figure 8 As shown, when the actuator 123 is extended to advance the pipe fixing bracket 121, the pipe fixing bracket 121 is closely attached to and supported on the outer side of the pipe D, thereby fixing the position of the pipe D. Therefore, during the subsequent process of forming the flange F1 at the lower end of the pipe D, the pipe D can be prevented from moving freely.

[0079] Next, if Figure 9As shown, when the forming part 160 is driven, the forming tool 161 repeatedly moves forward and backward while striking the inner circumference of the lower end of the pipe D as it circles around the inner circumference of the pipe D. The lower end of the pipe D is bent into a shape corresponding to the forming groove of the forming fixture 150, thereby forming a flange F1.

[0080] Specifically, the support portion 130 supports the lower end of the pipe D in the first position. This first position is set so that the lower end of the pipe D can be formed only by the first forming surface 151 during the bending process of the forming tool 161. Therefore, when the support portion 130 is moved to the first position, a flange F1 having a first shape and only horizontal elements is formed at one end of the pipe D.

[0081] In addition, after the forming tool 161 completes the forming of the flange F1 by circling the inner circumference of the pipe D, Figure 10 As shown, when the actuator 123 of the fixing portion 120 is contracted to move the pipe fixing frame 121 backward to release the fixing of the pipe D, the pipe D with the flange F1 formed can be taken out.

[0082] In addition, in order to connect the unit elements of the pipeline D, it is required to form a flange F2 having a second shape on the other end of the pipeline D.

[0083] In order to form the flange F2 having the second shape, as shown in FIG. Figure 11 As shown, the height of the support portion 130 is adjusted to the second position by lowering the support portion 130 using the height adjustment portion 140 .

[0084] The height adjustment portion 140 is composed of a plurality of lifting support frames 141 and a connecting shaft 142 for connecting a pair of adjacent lifting support frames 141 , wherein the plurality of lifting support frames 141 are connected and linked to each other via the connecting shaft 142 , thereby making it possible to easily adjust the height of the support portion 130 .

[0085] If we observe the connection between the lifting support frame 141 and the connecting shaft 142, we can see that Figure 12 As shown, a pinion 142a is formed on the end of the connecting shaft 142, and a rack 141a is formed on the side of the lifting support frame 141 to mesh with the pinion 142a. In addition, multiple connecting shafts 142 are connected to a lifting support frame 141. Therefore, the lifting support frame 141 is raised or lowered by the rotational force provided by one connecting shaft 142. The raising or lowering of the lifting support frame 141 causes the other connecting shafts 142 to rotate in conjunction, thereby enabling multiple lifting support frames 141 to be raised or lowered simultaneously.

[0086] As described above, when the support part 130 is moved to the second position by the height adjustment part 140 , when the other end of the pipe D is inserted into the fixing area of the pipe D, the lower end of the pipe D is mounted and supported on the support part 130 at the second position.

[0087] Afterwards, when the position of the pipe D is fixed by the fixing part 120 and the forming part 160 is driven, as shown in FIG. Figure 13 As shown, the forming tool 161 repeatedly moves forward and backward along the inner circumference of the pipe D to hit the inner circumference of the lower end of the pipe D, and then the lower end of the pipe D is bent into a shape corresponding to the forming groove of the forming fixture 150, and the flange F2 is formed.

[0088] That is, the support portion 130 moved to the second position is set to a position relatively lower than the first position, so that the length of the pipe D portion that is struck by the molding tool 161 and inserted into the molding groove is extended, thereby being able to form a second-shaped flange F2 having a horizontal element formed by the first molding surface 151 of the molding groove and a vertical element formed by the second molding surface 152.

[0089] Furthermore, after the flange F2 having the second shape is formed, the pipe D can be removed by releasing the fixing of the pipe D by the fixing portion 120 .

[0090] Figure 14 The unit element of the pipe D manufactured by the flange forming device of the circular pipe of the present invention is shown, one end of which is formed into a first shape flange F1 with a horizontal element, and the other end is formed into a second shape flange F2 with horizontal and vertical elements.

[0091] Regarding the unit elements of the pipeline D manufactured in this way, in the process of connecting multiple unit elements of the pipeline D to each other, the first shape flange F1 and the second shape flange F2 are docked with each other, and then the vertical element in the second shape flange F2 is bent, so that a pair of adjacent unit elements of the pipeline D can be connected.

[0092] According to the circular pipe flange forming device of this embodiment as described above, flanges F1 and F2 of different shapes for connecting unit elements of pipe D can be formed separately in one device for forming the flange of pipe D, thereby improving the use efficiency of the device.

[0093] The scope of the present invention is not limited to the above-described embodiments and can be implemented in various forms within the scope of the appended claims. Within the scope of the invention as claimed in the claims, various modifications that can be made by those skilled in the art to which the invention belongs are also within the scope of the claims.

Claims

1. A flange forming device for a circular pipe, characterized in that: include: a forming jig arranged to surround the outer peripheral surface of the lower end portion of the pipe and having a forming groove on a surface facing the pipe; a supporting portion, for supporting the lower end of the pipe below the forming fixture; A height adjustment portion, used to adjust the height of the support portion; a forming portion, configured to strike the inner circumferential surface of the lower end portion of the pipe, thereby forming a flange on the lower end portion of the pipe having a shape corresponding to the forming groove of the forming fixture; and a fixing portion, for selectively fixing the pipe on the forming fixture, The molding groove includes a first molding surface formed on a surface facing the pipe and a second molding surface further extended from a terminal end of the first molding surface. The height adjustment portion is used to adjust the relative position of the support portion with respect to the forming fixture so that the flange can be formed only on the first forming surface, or on both the first forming surface and the second forming surface. The molding jig and the fixing portion are divided into multiple parts. When the pipe is fixed, the sides of the divided forming fixtures and the sides of the fixing parts are in close contact with each other to guide the fixing position of the pipe. The fixing portion includes: A pipe fixing frame capable of supporting the outer side surface of the pipe, wherein the pipe fixing frame has an arc-shaped close-fitting surface; a guide member for movably supporting the pipeline fixing frame in a radial direction of the pipeline; and An actuator is used to move the pipe fixing frame.

2. The flange forming device for a circular pipe according to claim 1, characterized in that: The height adjustment unit includes: a plurality of lifting support frames arranged with the pipe as the center, the upper ends of the lifting support frames supporting the lower portion of the support unit; a connecting shaft arranged in a direction intersecting the lifting support frames and used to connect a pair of adjacent lifting support frames; and a driving motor for providing a rotational driving force to the connecting shaft. The lifting support frame is supported in a state in which it can be lifted and lowered, and the connecting shaft is supported in a state in which it can rotate. A rack and a pinion that mesh with each other are formed at a connection portion between the connecting shaft and the lifting support frame.

3. The flange forming device for a circular pipe according to claim 1, characterized in that: The first shaping surface is formed in a direction intersecting the longitudinal direction of the pipe. The second molding surface is formed in a direction parallel to the longitudinal direction of the duct.

4. The flange forming device for a circular pipe according to claim 1, characterized in that: The forming part includes: a forming tool, which circles around the inner circumference of the pipe and strikes the inner circumference of the pipe at a position corresponding to the forming groove to form a flange; and The power mechanism provides power for rotating, advancing and retreating the molding tool.

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