Elbow pipe holding device

Abstract

To provide an elbow pipe holding device for holding an elbow pipe so as to form an elbow pipe having its changed angle.SOLUTION: An elbow pipe holding device 1 includes a first elbow pipe receiving part 28 mounted on a first sandwiching part, and a second elbow pipe receiving part 30 mounted on a second sandwiching part, wherein an elbow pipe 2 is sandwiched between the first elbow pipe receiving part and the second elbow pipe receiving part, in a state in which the first elbow pipe receiving part and the second elbow pipe receiving part are sandwiched between the first sandwiching part and the second sandwiching part, angles of the first elbow pipe receiving part 28 and the second elbow pipe receiving part 30 are changed to the first sandwiching part 22, in a state in which the angle of the elbow pipe is changed, a second elbow pipe end part 2b exposed from the first elbow pipe receiving part and the second elbow pipe receiving part is processed by a processing device, and thereby the angles formed by a first elbow pipe end part 2a and the second elbow pipe end part 2b can be changed.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an elbow pipe holding device, and more particularly to an elbow pipe holding device that holds an elbow pipe so that the angle formed between a first elbow pipe end and a second elbow pipe end of the elbow pipe can be adjusted. [Background technology]

[0002] 2. Description of the Related Art Conventionally, as shown in Patent Document 1, it has been known to use a 90-degree elbow piping as the piping. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-85413 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when a 90-degree elbow pipe as shown in Patent Document 1 is used as piping, there may be a demand to adjust the bend angle of the elbow pipe to 89 degrees, 88 degrees, etc., depending on the on-site conditions. In the past, craftsmen would fine-tune the bend angle by cutting the elbow pipe on-site. This type of processing and adjustment work relied on the experience and intuition of the craftsman, so it required the work of a skilled craftsman, which led to problems such as inexperienced workers being unable to perform the work or reduced processing precision. In addition, even if a skilled craftsman works, there is a problem that the accuracy may vary. Furthermore, even if a skilled craftsman works, the adjustment of the elbow takes time, so the number of elbows that can be adjusted is very limited, and it is not possible to adjust a large number of elbows in a short period of time, for example, in one day.

[0005] In response to this problem, the inventors conducted extensive research into whether it would be possible to change the inclination while holding the elbow pipe. However, because the pipes to be held are hollow and curved, there is a problem that holding them is difficult. In addition, when cutting the elbow pipe with a blade, metal cutting generates vibrations, causing the elbow pipe to shift or move. If the elbow pipe shifts, not only does it become difficult to form the intended angle between the first elbow pipe end and the second elbow pipe end, but there is also a risk of defects such as unevenness on the machined surface.

[0006] The present invention has been made to solve such problems, and has an object to provide an elbow pipe holding device that holds an elbow pipe so that an elbow pipe with a changed angle can be formed. [Means for solving the problem]

[0007] In order to achieve the above object, according to one embodiment of the present invention, there is provided an elbow pipe holding device that holds an elbow pipe so that an angle formed between a first elbow pipe end and a second elbow pipe end of the elbow pipe can be adjusted, the device comprising: a first clamping portion, a second clamping portion, an operating portion that operates the distance between the first clamping portion and the second clamping portion, a first elbow pipe receiving portion attached to the first clamping portion, the inner surface of the first elbow pipe receiving portion being formed to fit with an outer surface of the elbow pipe on the first clamping portion side, and a second elbow pipe receiving portion attached to the second clamping portion, the inner surface of the second elbow pipe receiving portion being formed to fit with an outer surface of the elbow pipe on the second clamping portion side. and the second elbow pipe receiving portion formed as described above, wherein with the elbow pipe clamped between the first elbow pipe receiving portion and the second elbow pipe receiving portion and the first elbow pipe receiving portion and the second elbow pipe receiving portion clamped between the first clamping portion and the second clamping portion, the angle of the first elbow pipe receiving portion and the second elbow pipe receiving portion is changed relative to the first clamping portion and the second clamping portion, and with the angle of the elbow pipe changed, the second elbow pipe end exposed from the first elbow pipe receiving portion and the second elbow pipe receiving portion is processed by a processing device, thereby changing the angle formed by the first elbow pipe end and the second elbow pipe end of the elbow pipe. According to an embodiment of the present invention configured as described above, in a state where the elbow pipe is clamped between the first elbow pipe receiving portion and the second elbow pipe receiving portion, the angle of the first elbow pipe receiving portion and the second elbow pipe receiving portion can be changed with respect to the first clamping portion and the second clamping portion. As a result, by holding the elbow pipe in a state where the angle of the elbow pipe is changed and cutting the second elbow pipe end portion of the elbow pipe by a processing device, the angle between the first elbow pipe end portion and the second elbow pipe end portion of the elbow pipe, for example, 90 degrees, can be changed to an angle of 89 degrees, 88 degrees, or the like. Therefore, when fine adjustment is required when installing an elbow pipe during piping work in a plant factory or the like, for example, when an 89-degree elbow pipe is to be installed when a 90-degree elbow pipe would be bent by one degree too much when a 90-degree elbow pipe is installed, an elbow pipe with an angle changed with relatively high accuracy can be formed, and the processed elbow pipe can be installed. In the past, a craftsman would cut the elbow pipe on-site to fine-tune the bending angle, but according to this embodiment, an elbow pipe with a variable angle can be formed with relatively high accuracy without the work of a skilled craftsman. Also, a large number of elbow pipes with variable angles can be formed in the same amount of time without the work of a skilled craftsman, which contributes to the efficiency of construction work.

[0008] According to one embodiment of the present invention, preferably, the device further includes an inclination display unit that displays the inclination of the first elbow pipe receiving portion and the second elbow pipe receiving portion when the first elbow pipe receiving portion and the second elbow pipe receiving portion are clamped between the first clamping portion and the second clamping portion. According to one embodiment of the present invention configured as described above, the present invention further includes an inclination display unit that displays the inclination of the first elbow pipe receiving portion and the second elbow pipe receiving portion when the first elbow pipe receiving portion and the second elbow pipe receiving portion are clamped between the first clamping portion and the second clamping portion. This allows the angle of the first elbow pipe receiving portion and the second elbow pipe receiving portion to be changed relative to the first clamping portion and the second clamping portion more easily and more accurately. This allows elbow pipes with changed angles to be formed more efficiently, and a large number of elbow pipes with changed angles can be formed in the same amount of time, thereby contributing to the efficiency of construction work.

[0009] According to one embodiment of the present invention, preferably, the first elbow pipe receiving portion has a first end portion that supports the first elbow pipe end portion of the elbow pipe, and the second elbow pipe receiving portion has a second end portion that supports the first elbow pipe end portion of the elbow pipe. According to one embodiment of the present invention configured as described above, the first elbow pipe receiving portion includes a first end portion that supports the first elbow pipe end portion of the elbow pipe, and the second elbow pipe receiving portion includes a second end portion that supports the first elbow pipe end portion of the elbow pipe. As a result, the first end portion and the second end portion both support the first elbow pipe end portion of the elbow pipe, and when the elbow pipe is cut, the elbow pipe is less likely to move toward the first elbow pipe receiving portion or the second elbow pipe receiving portion, and the elbow pipe can be held more stably. Therefore, when the elbow pipe is machined, movement of the elbow pipe is suppressed, and the machining accuracy of the elbow pipe can be further improved.

[0010] According to one embodiment of the present invention, preferably, when the first elbow pipe receiving portion and the second elbow pipe receiving portion are clamped between the first clamping portion and the second clamping portion, the first clamping portion and the second clamping portion extend downward beyond the first elbow pipe receiving portion and the second elbow pipe receiving portion, forming a gap space below the first elbow pipe receiving portion and the second elbow pipe receiving portion. According to one embodiment of the present invention configured as described above, in a state in which the first elbow pipe receiving portion and the second elbow pipe receiving portion are sandwiched between the first clamping portion and the second clamping portion, the first clamping portion and the second clamping portion extend downward beyond the first elbow pipe receiving portion and the second elbow pipe receiving portion, forming a gap space below the first elbow pipe receiving portion and the second elbow pipe receiving portion. This makes it possible to change the angle of the first elbow pipe receiving portion and the second elbow pipe receiving portion relative to the first clamping portion and the second clamping portion.

[0011] According to one embodiment of the present invention, preferably, the first clamping portion has a first convex portion protruding toward the first elbow pipe receiving portion, the first convex portion forming a protrusion having a circular outer periphery and formed to fit into a first recess formed in the first elbow pipe receiving portion, and the second clamping portion has a second convex portion protruding toward the second elbow pipe receiving portion, the second convex portion forming a protrusion having a circular outer periphery and formed to fit into a second recess formed in the second elbow pipe receiving portion. According to an embodiment of the present invention configured as described above, when the first convex portion having a circular outer periphery of the first clamping portion is engaged with the first concave portion of the first elbow pipe receiving portion, the first elbow pipe receiving portion can rotate relative to the first clamping portion, and when the second convex portion having a circular outer periphery of the second clamping portion is engaged with the second concave portion of the second elbow pipe receiving portion, the second elbow pipe receiving portion can rotate relative to the second clamping portion. This allows the first elbow pipe receiving portion and the second elbow pipe receiving portion to easily change their angles relative to the first clamping portion and the second clamping portion, and this angle can be adjusted more easily. Therefore, elbow pipes with changed angles can be formed more efficiently, and many elbow pipes with changed angles can be formed in the same time, which contributes to the efficiency of construction.

[0012] According to one embodiment of the present invention, preferably, the first convex portion of the first clamping portion forms a tapered portion whose diameter decreases toward the first elbow pipe receiving portion side, and the second convex portion of the second clamping portion forms a tapered portion whose diameter decreases toward the second elbow pipe receiving portion side. According to one embodiment of the present invention configured as described above, the first convex portion of the first clamping portion forms a tapered portion whose diameter decreases toward the first elbow pipe receiving portion side, and the second convex portion of the second clamping portion forms a tapered portion whose diameter decreases toward the second elbow pipe receiving portion side. As a result, when the first elbow pipe receiving portion is attached to the first clamping portion, the first elbow pipe receiving portion is easily guided to an appropriate position along the tapered portion. Therefore, the first elbow pipe receiving portion can be positioned to an appropriate position relative to the first clamping portion and can be smoothly attached. Similarly, when the second elbow pipe receiving portion is attached to the second clamping portion, the second elbow pipe receiving portion is easily guided to an appropriate position along the tapered portion. Therefore, the second elbow pipe receiving portion can be positioned to an appropriate position relative to the second clamping portion and can be smoothly attached. Furthermore, the first elbow pipe receiving portion and the second elbow pipe receiving portion are positioned at opposing positions, so that the operation of clamping the elbow pipe at a predetermined position can be made more efficient.

[0013] According to one embodiment of the present invention, preferably, the first elbow pipe receiving portion has a first magnet on the first clamping portion side, and the first elbow pipe receiving portion is attached in a state in which it is attracted to the first clamping portion by the first magnet, and the second elbow pipe receiving portion has a second magnet on the second clamping portion side, and the second elbow pipe receiving portion is attached in a state in which it is attracted to the second clamping portion by the second magnet. According to one embodiment of the present invention configured as described above, the first elbow pipe receiving portion includes a first magnet on the first clamping portion side, and the first elbow pipe receiving portion is attached in a state of being attracted to the first clamping portion by the first magnet, and the second elbow pipe receiving portion includes a second magnet on the second clamping portion side, and the second elbow pipe receiving portion is attached in a state of being attracted to the second clamping portion by the second magnet. This makes it possible to prevent the first elbow pipe receiving portion from coming off or falling off the first clamping portion and the second elbow pipe receiving portion from coming off or falling off the second clamping portion when the distance between the first clamping portion and the second clamping portion is relatively large, for example, when the distance is relatively large before the elbow pipe is clamped or when the distance becomes relatively large in order to remove the elbow pipe after processing it. This prevents the first elbow pipe receiving portion and the second elbow pipe receiving portion from shifting or falling off when the elbow pipe is installed to clamp the elbow pipe or when the elbow pipe is removed after processing, making the elbow pipe processing work more efficient. Also, when processing the next elbow pipe after processing one elbow pipe is completed, the first elbow pipe receiving portion and the second elbow pipe receiving portion remain attached in an adsorbed state, so the next elbow pipe can be processed smoothly, contributing to work efficiency. Effect of the Invention

[0014] The elbow pipe holding device of the present invention holds an elbow pipe so that an elbow pipe with a changed angle can be formed. [Brief description of the drawings]

[0015] [Figure 1] 1 is an external perspective view of an elbow pipe adjustment system equipped with an elbow pipe holding device according to one embodiment of the present invention; [Diagram 2] FIG. 2 is a side view of an elbow pipe holding device according to one embodiment of the present invention. [Diagram 3] FIG. 2 is a front view of an elbow pipe holding device according to one embodiment of the present invention. [Figure 4]FIG. 2 is a partially enlarged perspective view showing an elbow pipe clamping portion in the elbow pipe holding device according to the embodiment of the present invention. [Diagram 5] 3 is a partially enlarged front view showing an elbow pipe clamping portion in the elbow pipe holding device according to the embodiment of the present invention; FIG. [Figure 6] This is a partially enlarged top view showing the portion that clamps the elbow pipe in an elbow pipe holding device according to one embodiment of the present invention, when the first clamping portion and the first elbow pipe receiving portion are not engaged and the second clamping portion and the second elbow pipe receiving portion are not engaged. [Figure 7] This is a partially enlarged top view showing the portion that clamps the elbow pipe in an elbow pipe holding device according to one embodiment of the present invention, where the first clamping portion and the first elbow pipe receiving portion are engaged and the second clamping portion and the second elbow pipe receiving portion are engaged. [Figure 8] 2 is a partially enlarged perspective view showing a first elbow pipe receiving portion of the elbow pipe holding device according to one embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an elbow pipe holding device according to an embodiment of the present invention will be described with reference to the accompanying drawings. First, Figure 1 is an external oblique view of an elbow pipe adjustment system equipped with an elbow pipe holding device according to one embodiment of the present invention, Figure 2 is a side view of an elbow pipe holding device according to one embodiment of the present invention, Figure 3 is a front view of an elbow pipe holding device according to one embodiment of the present invention, and Figure 4 is a partially enlarged oblique view showing an enlarged portion that clamps the elbow pipe in the elbow pipe holding device according to one embodiment of the present invention. In the following description of one embodiment of the present invention, the front side (the worker's side) as viewed from an operator standing in front of the processing device 6 performing processing work on an elbow pipe 2 is referred to as the front side, the processing device side is referred to as the rear side at the back, the direction to the operator's right hand is referred to as the right side, and similarly, the direction to the operator's left hand is referred to as the left side.

[0017] As shown in Fig. 1, an elbow pipe holding device 1 according to one embodiment of the present invention is an elbow pipe holding device that holds an elbow pipe (elbow) 2 for processing so that the angle formed between a first elbow pipe end 2a (see Fig. 4) and a second elbow pipe end 2b (see Fig. 4) of the elbow pipe 2 can be adjusted. The elbow pipe holding device 1 is provided in an elbow pipe adjustment system 4 that can adjust the angle formed between the first elbow pipe end 2a and the second elbow pipe end 2b of the elbow pipe 2. The elbow pipe adjustment system 4 constitutes a special angle (end angle) elbow pipe forming system that can form an elbow pipe 2 with a special angle (end angle).

[0018] The elbow pipe 2 is a hollow cylindrical pipe. The elbow pipe 2 is a bent elbow pipe arranged at a position where the first elbow pipe end 2a and the second elbow pipe end 2b have an angle. The elbow pipe 2 is a 90-degree bent elbow pipe where the angle between the first elbow pipe end 2a and the second elbow pipe end 2b is 90 degrees. As described later, in order to process the 90-degree elbow pipe 2 into an elbow pipe 2 of 89 degrees, 88 degrees, or the like, the elbow pipe holding device 1 firmly holds the elbow pipe 2 so that it is unlikely to move due to vibrations during processing or external forces. The elbow pipe 2 may be an elbow pipe of another angle, and can also be applied to a 45-degree bent elbow pipe and a 180-degree bent elbow pipe.

[0019] The elbow pipe adjustment system 4 further includes a processing device 6 that processes the elbow pipe 2. The processing device 6 is a cutting processing device that can process, for example, cut, the elbow pipe, such as an NC milling machine. The processing device 6 is, for example, an NC vertical milling machine with the rotation axis of the blade oriented vertically. The processing device 6 may be another milling machine such as a general-purpose milling machine, a machining center, or the like.

[0020] The processing device 6 includes a processing device main body 7, a blade 8 capable of cutting the elbow pipe 2, a rotational drive unit 10 for rotating the blade, a table 12 on which the elbow pipe holding device 1 is positioned, a position adjustment mechanism 14 for moving the blade 8 and the table 12, etc. to a predetermined position, and a processing device control unit 16 for controlling the rotational drive unit 10 and the position adjustment mechanism 14.

[0021] A rotary drive unit 10, a table 12, a position adjustment mechanism 14, etc. are attached to the processing device body 7.

[0022] As shown in FIG. 1, the blade 8 is attached to the rotary drive unit 10 and extends vertically downward. The blade 8 is formed so as to be able to process the elbow pipe 2 made of metal or resin. The blade 8 processes, for example, cuts the elbow pipe 2 by contacting the elbow pipe. In FIG. 5, for the purpose of explanation, the blade 8 for processing the second elbow pipe end portion 2b of the elbow pipe 2 is illustrated. The blade 8 is formed so as to be able to cut the elbow pipe 2 made of metal or resin. The blade 8 is, for example, in the shape of a drill. The blade 8 is, for example, an end mill, but may also be a face milling cutter or the like. The blade 8 is attached to the rotary drive unit 10 in a replaceable manner. The blade 8 is made of metal, for example, steel or an alloy.

[0023] As shown in Fig. 1, the rotary drive unit 10 rotates the attached blade 8 around the rotation axis of the main shaft. The rotary drive unit 10 is an electric motor. The rotary drive unit 10 is controlled by the processing device control unit 16 and is configured to rotate the blade 8 at a predetermined rotation speed.

[0024] The table 12 forms a flat platform. A concave groove 13 is formed on the top surface of the table 12. The groove 13 of the table 12 extends linearly in the left-right direction. The elbow pipe holding device 1 is attached and fixed to the groove 13. The groove 13 fixes the elbow pipe holding device 1 so that it does not move in the front-rear direction, and can also function as a guide for movement in the left-right direction.

[0025] The position adjustment mechanism 14 includes a blade position adjustment mechanism 18 that moves the rotation axis of the blade 8, and a work side position adjustment mechanism 20 that moves the position of the table 12, etc. to adjust the position of a work (object to be processed) such as an elbow pipe 2. The blade position adjustment mechanism 18 is attached to the rotary drive unit 10. The blade position adjustment mechanism 18 includes a mechanism for changing the position of the blade 8 and the rotation axis of the blade 8 relative to the processing device main body 7. Thus, the blade position adjustment mechanism 18 can move the position of the blade 8 and the rotation axis of the blade 8 to any position. The blade position adjustment mechanism 18 is electrically connected to the processing device control unit 16, and moves the position of the blade 8 and the rotation axis of the blade 8 according to a command from the processing device control unit 16. Thus, the elbow pipe 2 can be processed at any position under the control of the processing device control unit 16. The elbow pipe 2 can be positioned at any position only by the blade position adjustment mechanism 18 of the position adjustment mechanism 14, but the elbow pipe 2 may be positioned at any position by the blade position adjustment mechanism 18 and the work side position adjustment mechanism 20 of the position adjustment mechanism 14. The position adjustment mechanism 14 is electrically controlled, but as a modified example, the position may be adjusted manually.

[0026] The work-side position adjustment mechanism 20 is attached to the processing device main body 7 and is configured to adjust a work (work object) such as the elbow pipe 2 to a predetermined position. For example, the work-side position adjustment mechanism 20 forms a table position adjustment mechanism that moves the position of the table 12 relative to the processing device main body 7. At this time, the work-side position adjustment mechanism 20 is provided with a mechanism that can move the table 12 back and forth, left and right, and up and down. Therefore, the work-side position adjustment mechanism 20 can move the position of the table 12 to an arbitrary position. The work-side position adjustment mechanism 20 is electrically connected to the processing device control unit 16 and moves the position of the table 12 according to a command from the processing device control unit 16. Therefore, the elbow pipe 2 can be processed at an arbitrary position under the control of the processing device control unit 16. The elbow pipe 2 may be positioned at an arbitrary position only by the work-side position adjustment mechanism 20 of the position adjustment mechanism 14. The work-side position adjustment mechanism 20 is not limited to adjusting the position and orientation of the table 12, and may be configured to adjust the position of the work by adjusting other parts of the processing device main body 7.

[0027] The processing device control unit 16 is electrically connected to the rotation drive unit 10 and the position adjustment mechanism 14, and the processing device control unit 16 controls the rotation speed (the rotation speed of the blade) and ON / OFF of the rotation drive unit 10. The processing device control unit 16 also moves the blade 8 and / or the workpiece by the position adjustment mechanism 14, and can control the blade 8 to a predetermined position with respect to the elbow pipe 2. The processing device control unit 16 has a built-in CPU, memory, etc., and controls the position adjustment mechanism 14 and the rotation drive unit 10 based on a predetermined control program recorded in the memory, etc. The processing device control unit 16 can, for example, move the blade 8 to draw an arc at a predetermined height and cut the elbow pipe 2 to form a horizontal end surface at the upper end of the elbow pipe 2. The processing device control unit 16 is provided with a program that moves at least the blade 8 to draw a circle on the same horizontal plane to horizontally process the second elbow pipe end 2b. Therefore, the processing device control section 16 does not need to be provided with a program for adjusting the angle by moving the blade 8 three-dimensionally, and can be configured with a relatively simple program.

[0028] The elbow pipe holding device 1 has the function of holding an elbow pipe 2 as a workpiece (object to be processed) in a specified posture with enough strength to prevent it from moving during processing so that it can be processed at a specified angle. The elbow pipe holding device 1 is placed on a table 12 of a processing device 6. The elbow pipe holding device 1 can be positioned in the left-right direction along a groove 13 of the table 12, and can also be fixed to the groove 13.

[0029] As shown in FIG. 2, the elbow pipe holding device 1 includes a holding device main body 21, a first clamping portion 22 provided on the holding device main body 21 and configured to clamp the first elbow pipe receiving portion 28 and the like from a first direction D1 (see FIG. 6), a second clamping portion 24 provided on the holding device main body 21 and configured to clamp the second elbow pipe receiving portion 30 and the like from a second direction D2 (see FIG. 6) so as to be paired with the first clamping portion 22, and a clamping portion 25 between the first clamping portion 22 and the second clamping portion 24. The device comprises an operating unit 26 for controlling the distance, a first elbow pipe receiving portion 28 attached to the first clamping portion 22, the first elbow pipe receiving portion 28 being formed to fit with the outer surface of the elbow pipe 2 on the first clamping portion 22 side, and a second elbow pipe receiving portion 30 attached to the second clamping portion 24, the second elbow pipe receiving portion 30 being formed to fit with the outer surface of the elbow pipe 2 on the second clamping portion 24 side.

[0030] The first clamping portion 22 is provided so as to stand up like a plate on the holding device main body 21. The first clamping portion 22 is formed so as to clamp an object between itself and the second clamping portion 24. The first clamping portion 22 is fixed onto the holding device main body 21, for example. The first clamping portion 22 is made of metal and can firmly clamp the object inside.

[0031] As shown in Fig. 6, the first clamping portion 22 has a first protruding portion 22a that protrudes toward the first elbow pipe receiving portion 28. The first protruding portion 22a forms a protruding portion having a circular outer periphery. The first protruding portion 22a has a circular outer periphery and is formed in a trapezoidal shape that is one step higher than the first flat surface 22b. The first protruding portion 22a forms a tapered portion whose diameter decreases from the first flat surface 22b toward the first elbow pipe receiving portion 28. This first protruding portion 22a is formed to fit into a first recessed portion 28a formed in the first elbow pipe receiving portion 28. The first plane 22b forms a flat surface around the first convex portion 22a. The first plane 22b forms a flat surface that extends to the outer edge of the first clamping portion 22 outside the first convex portion 22a. Therefore, the first plane 22b is unlikely to interfere with a first receiving portion side plane 28b of the first elbow pipe receiving portion 28 described below, and is movable relative to the first receiving portion side plane 28b. Therefore, the first elbow pipe receiving portion 28 is configured to be rotatable with respect to the first clamping portion 22.

[0032] The second clamping portion 24 is provided on the holding device main body 21 so as to rise up in a plate shape. The second clamping portion 24 is formed so as to clamp an object between itself and the first clamping portion 22. By rotating the operating portion 26, the second clamping portion 24 is moved toward the first clamping portion 22 (the object is clamped when the second clamping portion 24 abuts against the object) via a screw (not shown) connected to the operating portion 26 (the screw is also connected to the second clamping portion 24). In the elbow pipe holding device 1, the first clamping portion 22 and the second clamping portion 24 function to clamp and fix the object from two directions like a so-called vice. The second clamping portion 24 is made of metal and can firmly clamp the object inside. In addition, the second clamping portion 24 may be configured to be fixed to the holding device main body 21 and the first clamping portion 22 may be configured to move toward the second clamping portion 24, or both the second clamping portion 24 and the first clamping portion 22 may be configured to move toward each other.

[0033] The second clamping portion 24 includes a second protruding portion 24a that protrudes toward the second elbow pipe receiving portion 30, and the second protruding portion 24a forms a protruding portion having a circular outer periphery. The second protruding portion 24a has a circular outer periphery and is formed in a trapezoidal shape that is one step higher than the second flat surface 24b. The second protruding portion 24a forms a tapered portion whose diameter decreases from the second flat surface 24b toward the second elbow pipe receiving portion 30. This second protruding portion 24a is formed to fit into the second recessed portion 30a formed in the second elbow pipe receiving portion 30. The second protruding portion 24a is disposed in a position facing the first protruding portion 22a. The second plane 24b forms a flat surface around the second protrusion 24a. The second plane 24b forms a flat surface outside the second protrusion 24a up to the outer edge of the second clamping portion 24. Therefore, the second plane 24b is unlikely to interfere with the second receiving portion side plane 30b on the second elbow pipe receiving portion 30 side described later, and is movable relative to the second receiving portion side plane 30b. Therefore, the second elbow pipe receiving portion 30 is configured to be rotatable with respect to the second clamping portion 24.

[0034] The first elbow pipe receiving portion 28 is disposed at a position inside the first clamping portion 22. The first elbow pipe receiving portion 28 comprises a first receiving portion 32 formed on its inner inner surface and forming an arc-shaped inner surface, a first inlet portion 34 provided at the inlet side end of the first receiving portion 32, a first end portion 36 forming an end portion on the rear side of the first receiving portion 32, a first recess 28a formed on the outer surface of the first elbow pipe receiving portion 28 so as to fit with the first convex portion 22a, a first external force receiving portion 38 for changing the posture of the first elbow pipe receiving portion 28 when subjected to the action of a force, a tilt indicating portion 40 (see Figure 5) for indicating the tilt of the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 when the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 are clamped between the first clamping portion 22 and the second clamping portion 24, and a first magnet 44 provided on the first clamping portion 22 side of the first elbow pipe receiving portion 28.

[0035] As shown in Figs. 6 and 8, the first receiving portion 32 forms a semicircular (half-pipe) inner surface that is half a cylinder. The first receiving portion 32 forms a receiving portion on its inner surface that is shaped to match the outer surface of an area slightly smaller than half the outer surface of the elbow pipe 2. More specifically, the first receiving portion 32 forms an inner surface in an arc shape that corresponds to the outer surface of the elbow pipe 2, and the radius of this arc is approximately the same as the radius of the outer circumference of the elbow pipe 2. The semicircular inner surface of the first receiving portion 32 is formed from the inlet portion 34 to the first end portion 36 at the bottom. In a side view, the first end portion 36 is provided at a position bent at approximately 90 degrees with respect to the first inlet portion 34 of the first receiving portion 32, and the first receiving portion 32 forms a continuous recess while bending from the first inlet portion 34 to the first end portion 36.

[0036] The first receiving portion 32 is created in a shape that matches the pipe diameter and bend shape of the elbow pipe 2. A plurality of variations of the first receiving portion 32 can be created in advance to match the pipe diameter and shape such as the bend radius of the elbow pipe 2. Because the first elbow pipe receiving portion 28 is formed from resin, it is relatively easy to create a variety of first receiving portions 32 that match the pipe diameter and shape such as the bend radius of the elbow pipe 2.

[0037] As shown in FIG. 8, the first inlet portion 34 forms a semicircular opening. The first inlet portion 34 and the first end portion 36 form an angle of 90 degrees. As shown in FIG. 4, the first inlet portion 34 is provided at a position slightly below the end portion of the elbow pipe 2 so that the end portion of the elbow pipe 2 protrudes outward from the first receiving portion 32. The distance L1 from the first end portion 36 to the height of the first inlet portion 34 (the same distance as the distance L1 from the second end portion 50 to the height of the second inlet portion 48 shown in FIG. 5) is formed slightly shorter than the radius of curvature R1 of the bend of the first receiving portion 32 (the same radius of curvature as the radius of curvature R1 of the bend of the second receiving portion 46 shown in FIG. 5). The radius of curvature R1-distance L1=elbow pipe protrusion amount L2. The elbow pipe protrusion amount L2 is the amount of protrusion from the first inlet portion 34 to the second elbow pipe end portion 2b (the same amount of protrusion as the elbow pipe protrusion amount L2 from the second inlet portion 48 to the second elbow pipe end portion 2b shown in Figure 5), and is a value within the range of 5 mm to 40 mm.

[0038] The first end 36 is formed so as to support at least a part of the first elbow pipe end 2a of the elbow pipe 2 at the rear side of the elbow pipe 2. The first end 36 forms a roughly semicircular abutment surface at a position facing the first elbow pipe end 2a, which is the rear end of the elbow pipe 2. Thus, the first elbow pipe end 2a of the elbow pipe 2 abuts against the first end 36, and the first end 36 restricts the movement of the elbow pipe 2 as a bottom so that the elbow pipe 2 is less likely to move toward the first end 36.

[0039] The first recess 28a is formed in a shape that pairs with the first protrusion 22a, and is formed to receive and fit the first protrusion 22a. The first recess 28a forms a bottom having a circular outer periphery. The first recess 28a has a circular outer periphery and is formed in a mortar shape that is one step lower than the first receiving portion side flat surface 28b. The first recess 28a forms a tapered portion whose diameter increases from the bottom toward the first clamping portion 22 side.

[0040] The first external force receiving portion 38 is formed by a flat surface formed on the outer periphery of the first elbow pipe receiving portion 28. The outer periphery of the first elbow pipe receiving portion 28 is formed in a substantially rectangular parallelepiped shape. When the first elbow pipe receiving portion 28 has a rectangular outer shape, the first external force receiving portion 38 is formed on, for example, four surfaces on the outer periphery of the first elbow pipe receiving portion 28. By applying a force to the first external force receiving portion 38 on this outer periphery surface by an operating portion (not shown), the posture of the first elbow pipe receiving portion 28, the second elbow pipe receiving portion 30, and the elbow pipe 2 sandwiched between them can be changed as a whole. The operating portion can be, for example, a mallet, a hammer, a human finger, or the like.

[0041] The inclination display unit 40 is disposed on the inlet side flat surface 42 (see FIG. 5) of the outer periphery of the first elbow pipe receiving portion 28 or on the inlet side flat surface of the second elbow pipe receiving portion 30. The inlet side flat surface 42 forms a surface parallel to the second elbow pipe end 2b of the 90-degree elbow pipe 2. Therefore, the inclination of the inlet side flat surface 42 corresponds to the inclination of the second elbow pipe end 2b. Therefore, the inclination of the second elbow pipe end 2b can be estimated by the inclination display unit 40 measuring the inclination of the inlet side flat surface 42. For the sake of simplicity, the inclination display unit 40 is shown only in FIG. 5 and FIG. 7 and is omitted in other figures. The inclination display unit 40 is attached to the inlet side flat surface 42, for example. The inclination display unit 40 is provided with an inclination measuring unit that measures the inclination (inclination angle) of the inlet side flat surface 42, for example. The inclination display unit 40 also has a function of displaying the measured inclination. Therefore, when the inlet flat surface 42 and the sandwiched elbow pipe 2 are inclined, the value of the inclination can be confirmed. In addition, in order to form an elbow pipe 2 at a predetermined angle, the elbow pipe 2 is inclined to a predetermined angle, and the inclination can be confirmed on the inclination display unit 40. After confirmation, the second elbow pipe end 2b is processed while moving the blade 8 of the processing device horizontally, so that an elbow pipe 2 with an adjusted angle formed by the first elbow pipe end 2a and the second elbow pipe end 2b can be obtained relatively easily. The inclination display unit 40 is provided on the inlet flat surface 42 of the first elbow pipe receiving portion 28, but may be provided on the inlet flat surface of the second elbow pipe receiving portion 30. The tilt display unit 40 is not limited to an electronic tilt measuring device, and may be configured so that the current tilt angle of the first elbow pipe receiving portion 28 or the second elbow pipe receiving portion 30 can be recognized (displayed) by previously marking an angle indication (mark) on the inner surface of the first clamping portion 22 (or the second elbow pipe receiving portion 30).

[0042] The first magnet 44 is attached to the first elbow pipe receiving portion 28 and is disposed within the bottom of the first recess 28a. The first magnet 44 is disposed at a position symmetrical with respect to the center of the circle of the first recess 28a. The surface of the first magnet 44 and the surrounding surface within the first recess 28a form the same plane. The first magnet 44 can be attracted to the metal of the first protrusion 22a of the first clamping portion 22, and the first elbow pipe receiving portion 28 can be attached to the first clamping portion 22 relatively easily. The first elbow pipe receiving portion 28 is attached in a state where it is attracted to the first clamping portion 22 by the first magnet 44. The first magnet 44 can maintain the first elbow pipe receiving portion 28 in an attached state to the first clamping portion 22. Therefore, when moving the first clamping portion 22 and the second clamping portion 24 away from each other to process the next elbow pipe 2, the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 can be prevented from falling away from the first clamping portion 22 and the second clamping portion 24. This improves the convenience when placing the elbow pipe 2, improves the work efficiency, and allows more elbow pipes 2 to be processed per unit time. The first magnet 44 may be placed on the first receiving portion side flat surface 28b without being limited to being placed in the first recess 28a. The number and placement of the first magnets 44 may be changed as desired.

[0043] The second elbow pipe receiving portion 30 comprises a second receiving portion 46 formed on its inner inner surface and forming an arc-shaped inner surface, a second inlet portion 48 provided at the inlet side end of the second receiving portion 46, a second end portion 50 forming an end portion on the rear side of the second receiving portion 46, a second recess portion 30a formed on the outer surface of the second elbow pipe receiving portion 30 so as to engage with the second convex portion 24a, a second external force receiving portion 52 for changing the posture of the second elbow pipe receiving portion 30 when subjected to the action of a force, and a second magnet 54 provided on the second clamping portion side of the second elbow pipe receiving portion 30.

[0044] As shown in FIG. 6, the second receiving portion 46 forms a semicircular (half-pipe) inner surface that is half a cylinder. The second receiving portion 46 forms a receiving portion on its inner surface that is shaped to match the outer surface of an area slightly smaller than half the outer surface of the elbow pipe 2. More specifically, the second receiving portion 46 forms an inner surface in an arc shape that corresponds to the outer surface of the elbow pipe 2, and the radius of this arc is approximately the same as the radius of the outer circumference of the elbow pipe 2. As shown in FIG. 5, the semicircular inner surface of the second receiving portion 46 is formed from the second inlet portion 48 to the second end portion 50 at the bottom. In a side view, the second end portion 50 is provided at a position bent at approximately 90 degrees with respect to the second inlet portion 48 of the second receiving portion 46, and the second receiving portion 46 forms a continuous recess while bending from the second inlet portion 48 to the second end portion 50.

[0045] The second receiving portion 46 is created in a shape that matches the pipe diameter dimension and bend shape of the elbow pipe 2. A plurality of variations of the second receiving portion 46 can be created in advance to match the pipe diameter dimension, bend radius, and other shapes of the elbow pipe 2. Because the second receiving portion 46 is formed from resin, it is relatively easy to create a variety of second receiving portions 46 that match the pipe diameter dimension, bend radius, and other shapes of the elbow pipe 2.

[0046] As shown in FIG. 6, the second inlet portion 48 forms a semicircular opening. As shown in FIG. 5, the second inlet portion 48 and the second end portion 50 form an angle of 90 degrees. The second inlet portion 48 is provided at a position slightly lower than the end portion of the elbow pipe 2 so that the end portion of the elbow pipe 2 protrudes outward from the second receiving portion 46. The distance L1 from the second end portion 50 to the height of the second inlet portion 48 is formed to be slightly shorter than the curvature radius R1 of the bend of the second receiving portion 46. The curvature radius R1-distance L1=elbow pipe protrusion amount L2 is the protrusion amount from the second inlet portion 48 to the second elbow pipe end portion 2b, and is a value within a range of 5 mm to 40 mm.

[0047] The second end 50 is formed so as to support at least a portion of the first elbow pipe end 2a of the elbow pipe 2 at the rear side of the elbow pipe 2. The second end 50 forms a roughly semicircular abutment surface at a position facing the first elbow pipe end 2a, which is the rear end of the elbow pipe 2. Thus, the first elbow pipe end 2a of the elbow pipe 2 abuts against the second end 50, and the second end 50 restricts the movement of the elbow pipe 2 as a bottom so that the elbow pipe 2 is less likely to move toward the second end 50.

[0048] The second recess 30a is formed in a shape that pairs with the second protrusion 24a, and is formed to receive and fit the second protrusion 24a. The second recess 30a forms a bottom having a circular outer periphery. The second recess 30a has a circular outer periphery and is formed in a mortar shape that is one step lower than the second receiving portion side flat surface 30b. The second recess 30a forms a tapered portion whose diameter increases from the bottom toward the second clamping portion 24 side.

[0049] The second external force receiving portion 52 is formed by a flat surface formed on the outer periphery of the second elbow pipe receiving portion 30. When the second elbow pipe receiving portion 30 has a rectangular outer shape, the second external force receiving portion 52 is formed on, for example, four surfaces on the outer periphery of the second elbow pipe receiving portion 30. By applying a force to the second external force receiving portion 52 on this outer periphery surface by an operating portion (not shown), the posture of the first elbow pipe receiving portion 28, the second elbow pipe receiving portion 30, and the elbow pipe 2 sandwiched between them can be changed as a whole. The operating portion can be, for example, a mallet, a hammer, a human finger, etc.

[0050] The second magnet 54 is attached to the second elbow pipe receiving portion 30 and is disposed within the bottom of the second recess 30a. The second magnet 54 is disposed at a position symmetrical with respect to the center of the circle of the second recess 30a. The surface of the second magnet 54 and the surrounding surface within the second recess 30a form the same plane. The second magnet 54 can be attracted to the metal of the second protrusion 24a of the second clamping portion 24, and the second elbow pipe receiving portion 30 can be attached to the second clamping portion 24 relatively easily. The second elbow pipe receiving portion 30 is attached in a state where it is attracted to the second clamping portion 24 by the second magnet 54. The second magnet 54 can maintain the second elbow pipe receiving portion 30 in an attached state to the second clamping portion 24. Therefore, when moving the first clamping portion 22 and the second clamping portion 24 away from each other to process the next elbow pipe 2, the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 can be prevented from falling away from the first clamping portion 22 and the second clamping portion 24. This improves the convenience when placing the elbow pipe 2, improves the work efficiency, and allows more elbow pipes 2 to be processed per unit time. The second magnet 54 may be placed not only in the second recess 30a but also on the second receiving portion side flat surface 30b. The number and arrangement of the second magnets 54 may be changed as desired.

[0051] According to this configuration, the elbow pipe 2 is clamped between the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30, and the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 are clamped between the first clamping portion 22 and the second clamping portion 24, and the angle of the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 is changed relative to the first clamping portion 22 and the second clamping portion 24. In a state in which the angle of the elbow pipe 2 is changed, the exposed second elbow pipe end portion 2b of the elbow pipe 2 is processed by the processing device 6, so that the angle formed by the first elbow pipe end portion 2a and the second elbow pipe end portion 2b of the elbow pipe 2 can be changed. First, the elbow pipe holding device 1 can hold the elbow pipe 2 in a state in which the second elbow pipe end portion 2b exposed on the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 is tilted from the horizontal plane. In addition, the elbow pipe holding device 1 can hold the elbow pipe 2 firmly so that it is not easily moved by vibrations or applied forces related to processing by the processing device. With the second elbow pipe end 2b tilted from the horizontal plane, the angle between the first elbow pipe end 2a and the second elbow pipe end 2b of the elbow pipe 2 can be adjusted to a special angle (end angle) by, for example, cutting the second elbow pipe end 2b horizontally. For example, the angle between the first elbow pipe end 2a and the second elbow pipe end 2b of the elbow pipe 2 can be changed from 90 degrees to any angle such as 89 degrees or 88 degrees. Therefore, the 90-degree elbow pipe 2 can be adjusted to an 89-degree or 88-degree elbow pipe 2, and the angle can be adjusted to suit the construction site.

[0052] 2, with the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 being clamped between the first clamping portion 22 and the second clamping portion 24, the first clamping portion 22 and the second clamping portion 24 extend below the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30, forming a clearance space S (see FIGS. 2 and 5) below the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30. Because the clearance space S is formed, the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 are capable of rotating at any angle so as to have a predetermined inclination.

[0053] Next, according to an embodiment of the present invention configured as described above, in a state where the elbow pipe 2 is clamped between the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30, the angle of the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 can be changed with respect to the first clamping portion 22 and the second clamping portion 24. As a result, by holding the elbow pipe 2 in a state where the angle of the elbow pipe 2 is changed and cutting the second elbow pipe end portion 2b of the elbow pipe 2 by the processing device 6, the angle formed by the first elbow pipe end portion and the second elbow pipe end portion 2b of the elbow pipe 2, for example, 90 degrees, can be changed to an angle of 89 degrees, 88 degrees, or the like. Therefore, when fine adjustment is required when attaching the elbow pipe 2 during piping work in a plant factory or the like, for example, when an 89-degree elbow pipe 2 is to be attached when a 90-degree elbow pipe 2 is attached and it would be bent by one degree too much, an elbow pipe 2 with an angle changed with relatively high accuracy can be formed, and the processed elbow pipe 2 can be attached. In the past, a craftsman would cut the elbow pipe 2 on-site to fine-tune the bending angle, but according to this embodiment, it is possible to form an elbow pipe 2 with a variable angle with relatively high precision without the work of a skilled craftsman. Also, it is possible to form a large number of elbow pipes 2 with variable angles in the same amount of time without the work of a skilled craftsman, which contributes to the efficiency of construction work.

[0054] According to one embodiment of the present invention configured as described above, there is further provided an inclination display unit 40 that displays the inclination of the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 in a state in which the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 are clamped between the first clamping portion 22 and the second clamping portion 24. This allows the angle of the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 to be adjusted more easily and more accurately when the angle is changed relative to the first clamping portion 22 and the second clamping portion 24. Therefore, elbow pipes 2 with changed angles can be formed more efficiently, and a large number of elbow pipes 2 with changed angles can be formed in the same amount of time, which contributes to more efficient construction work.

[0055] According to one embodiment of the present invention configured as described above, the first elbow pipe receiving portion 28 includes a first end portion 36 that supports the first elbow pipe end portion 2a of the elbow pipe 2, and the second elbow pipe receiving portion 30 includes a second end portion 50 that supports the first elbow pipe end portion 2a of the elbow pipe 2. As a result, both the first end portion 36 and the second end portion 50 support the first elbow pipe end portion 2a of the elbow pipe 2, and when the elbow pipe 2 is cut, the elbow pipe 2 is less likely to move toward the first elbow pipe receiving portion 28 or the second elbow pipe receiving portion 30, and the elbow pipe 2 can be held more stably. Therefore, when the elbow pipe 2 is machined, the elbow pipe 2 is prevented from moving, and the machining accuracy of the elbow pipe 2 can be further improved.

[0056] According to one embodiment of the present invention configured as described above, in a state in which the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 are sandwiched between the first clamping portion 22 and the second clamping portion 24, the first clamping portion 22 and the second clamping portion 24 extend downward beyond the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30, forming a gap space S below the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30. This makes it possible to change the angle of the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 relative to the first clamping portion 22 and the second clamping portion 24.

[0057] According to an embodiment of the present invention configured as described above, in a state where the first convex portion 22a having a circular outer periphery of the first clamping portion 22 and the first concave portion 28a of the first elbow pipe receiving portion 28 are fitted together, the first elbow pipe receiving portion 28 can rotate with respect to the first clamping portion 22, and in a state where the second convex portion 24a having a circular outer periphery of the second clamping portion 24 and the second concave portion of the second elbow pipe receiving portion 30 are fitted together, the second elbow pipe receiving portion 30 can rotate with respect to the second clamping portion 24. This allows the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 to easily change the angle with respect to the first clamping portion 22 and the second clamping portion 24, and this angle can be adjusted more easily. Therefore, the elbow pipe 2 with a changed angle can be formed more efficiently, and a large number of elbow pipes 2 with changed angles can be formed in the same time, which contributes to the efficiency of construction.

[0058] According to one embodiment of the present invention configured as described above, the first convex portion 22a of the first clamping portion 22 forms a tapered portion whose diameter decreases toward the first elbow pipe receiving portion 28 side, and the second convex portion 24a of the second clamping portion 24 forms a tapered portion whose diameter decreases toward the second elbow pipe receiving portion 30 side. As a result, when the first elbow pipe receiving portion 28 is attached to the first clamping portion 22, the first elbow pipe receiving portion 28 is easily guided to an appropriate position along the tapered portion. Therefore, the first elbow pipe receiving portion 28 can be positioned at an appropriate position relative to the first clamping portion 22 and can be smoothly attached. Similarly, when the second elbow pipe receiving portion 30 is attached to the second clamping portion 24, the second elbow pipe receiving portion 30 is easily guided to an appropriate position along the tapered portion. Therefore, the second elbow pipe receiving portion 30 can be positioned at an appropriate position relative to the second clamping portion 24 and can be smoothly attached. Furthermore, by positioning the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 at opposing positions, the operation of clamping the elbow pipe 2 at a predetermined position can be made more efficient.

[0059] According to one embodiment of the present invention configured as described above, the first elbow pipe receiving portion 28 includes a first magnet on the first clamping portion 22 side, and the first elbow pipe receiving portion 28 is attached in a state of being attracted to the first clamping portion 22 by the first magnet, and the second elbow pipe receiving portion 30 includes a second magnet on the second clamping portion 24 side, and the second elbow pipe receiving portion 30 is attached in a state of being attracted to the second clamping portion 24 by the second magnet. This makes it possible to prevent the first elbow pipe receiving portion 28 from coming off or falling off the first clamping portion 22 and the second elbow pipe receiving portion 30 from coming off or falling off the second clamping portion 24 when the distance between the first clamping portion 22 and the second clamping portion 24 is relatively large, for example, when the distance is relatively large before the elbow pipe 2 is clamped or when the distance becomes relatively large in order to remove the elbow pipe 2 after processing it. This prevents the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 from shifting or falling off when the elbow pipe 2 is installed to clamp the elbow pipe 2 or when the elbow pipe 2 is removed after processing, making it possible to efficiently process the elbow pipe 2. Furthermore, even when processing the next elbow pipe 2 after processing one elbow pipe 2 is completed, the first elbow pipe receiving portion 28 and the second elbow pipe receiving portion 30 remain attached in an adsorbed state, so that the processing of the next elbow pipe 2 can be performed smoothly, contributing to efficient work efficiency.

[0060] The embodiment of the present invention is not limited to the above, and other modified examples may be applied. In this embodiment, the elbow pipe 2 is exemplified as a 90-degree bent elbow pipe as a processing target, but the present invention may also be applied to elbow pipes of other angles, for example, 45-degree bent elbow pipes and 180-degree bent elbow pipes. When holding an elbow pipe of another angle, the first elbow pipe receiving portion and the second elbow pipe receiving portion are formed into a shape that fits with the outer surface of the elbow pipe of another angle.

[0061] In this embodiment, the first convex portion 22a is formed to fit into the first concave portion 28a, and the second convex portion 24a is formed to fit into the second concave portion 30a. As a modified example, the concave portion and the convex portion may be reversed. Specifically, a concave portion may be formed in the first clamping portion 22, and a convex portion may be formed in the first elbow pipe receiving portion 28. Similarly, as a further modified example, a concave portion may be formed in the second clamping portion 24, and a convex portion may be formed in the second elbow pipe receiving portion 30.

[0062] In this embodiment, the first convex portion 22a is formed to fit into the first recess 28a, and the second convex portion 24a is formed to fit into the second recess 30a. As a modified example, the first clamping portion 22 and the first elbow pipe receiving portion 28 can be formed to engage with each other without being limited to a shape that allows them to fit together. In other words, the shapes of the first convex portion 22a, the first recess 28a, the second convex portion 24a, and the second recess 30a can be changed arbitrarily to the extent that they can be engaged with each other. [Explanation of symbols]

[0063] 1: Elbow pipe holding device 2: Elbow pipe 2a: First elbow pipe end 2b: Second elbow pipe end 6: Processing equipment 22: First clamping section 22a: First protrusion 24: Second clamping section 24a: Second protrusion 26:Operation section 28: First elbow pipe receiving part 28a: First recess 30: Second elbow pipe receiving part 30a: Second recess 36:First end 40: Tilt display 44: First magnet 50: 2nd end 54: Second magnet S: gap space

Claims

1. An elbow pipe holding device that holds an elbow pipe so as to adjust an angle between a first elbow pipe end portion and a second elbow pipe end portion of the elbow pipe, A first clamping portion; A second clamping portion; an operation unit that operates a distance between the first clamping portion and the second clamping portion; a first elbow pipe receiving portion attached to the first clamping portion, the first elbow pipe receiving portion being formed so that an inner surface of the first elbow pipe receiving portion fits with an outer surface of the elbow pipe on the first clamping portion side; a second elbow pipe receiving portion attached to the second clamping portion, the inner surface of the second elbow pipe receiving portion being formed to fit with an outer surface of the elbow pipe on the second clamping portion side; while the elbow pipe is clamped between the first elbow pipe receiving portion and the second elbow pipe receiving portion, and while the first elbow pipe receiving portion and the second elbow pipe receiving portion are clamped between the first clamping portion and the second clamping portion, the first elbow pipe receiving portion and the second elbow pipe receiving portion are changed in angle with respect to the first clamping portion and the second clamping portion, An elbow pipe holding device which can change the angle formed by the first elbow pipe end and the second elbow pipe end of the elbow pipe by processing the second elbow pipe end exposed from the first elbow pipe receiving portion and the second elbow pipe receiving portion with a processing device while changing the angle of the elbow pipe.

2. The elbow pipe holding device of claim 1, further comprising an inclination display unit that displays an inclination of the first elbow pipe receiving portion and the second elbow pipe receiving portion when the first elbow pipe receiving portion and the second elbow pipe receiving portion are clamped between the first clamping portion and the second clamping portion.

3. 2. The elbow pipe holding device of claim 1, wherein the first elbow pipe receiving portion has a first end that supports the first elbow pipe end of the elbow pipe, and the second elbow pipe receiving portion has a second end that supports the first elbow pipe end of the elbow pipe.

4. In a state in which the first elbow pipe receiving portion and the second elbow pipe receiving portion are clamped between the first clamping portion and the second clamping portion, The elbow pipe holding device of claim 1, wherein the first clamping portion and the second clamping portion extend downwardly beyond the first elbow pipe receiving portion and the second elbow pipe receiving portion, forming a gap space below the first elbow pipe receiving portion and the second elbow pipe receiving portion.

5. The first clamping portion includes a first protrusion protruding toward the first elbow pipe receiving portion, The first convex portion forms a protruding portion having a circular outer periphery and is formed to fit into a first concave portion formed in the first elbow pipe receiving portion, The second clamping portion includes a second protrusion protruding toward the second elbow pipe receiving portion, 2. The elbow pipe holding device according to claim 1, wherein the second convex portion forms a protruding portion having a circular outer periphery and is formed to mate with a second concave portion formed in the second elbow pipe receiving portion.

6. 6. The elbow pipe holding device as described in claim 5, wherein the first convex portion of the first clamping portion forms a tapered portion whose diameter decreases toward the first elbow pipe receiving portion side, and the second convex portion of the second clamping portion forms a tapered portion whose diameter decreases toward the second elbow pipe receiving portion side.

7. the first elbow pipe receiving portion is provided with a first magnet on the first clamping portion side, and the first elbow pipe receiving portion is attached in a state where it is attracted to the first clamping portion by the first magnet, The elbow pipe holding device of claim 1, wherein the second elbow pipe receiving portion is provided with a second magnet on the second clamping portion side, and the second elbow pipe receiving portion is attached in a state in which it is attracted to the second clamping portion by the second magnet.

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