JP6306912B2 - Welding equipment - Google Patents

Description

  The present invention relates to a welding apparatus that performs butt welding between tubes.

  Conventionally, a welding apparatus that automatically performs butt welding between tubes is known. For example, Patent Document 1 discloses a welding apparatus 100 capable of performing all-position welding on a tube 150 placed sideways as shown in FIGS. 9 (a) and 9 (b).

  The welding apparatus 100 is configured such that the welding torch 130 can move in the radial direction of the tube 150 in order to adjust the length of the arc. Specifically, the welding apparatus 100 has two C-shaped rings, a rotating ring 110 and an upper and lower ring 120, as rotating members that rotate around the central axis of the tube 150. The rotation ring 110 and the upper and lower rings 120 can rotate independently of each other.

  A welding torch 130 is attached to the rotating ring 110 via a torch base 140 so as to be swingable. On the other hand, the vertical ring 120 is provided with a groove 125 inclined with respect to the circumferential direction, and a shaft 145 fixed to the torch base 140 is inserted into the groove 125. Then, when the vertical ring 120 rotates relative to the rotating ring 110, the shaft 145 is guided by the groove 125, and the welding torch 130 approaches or moves away from the tube 150.

JP 2001-225165 A

  However, in the welding torch 100 as shown in FIGS. 9A and 9B, the welding torch 100 is attached to the rotating member (the rotating ring 110 and the upper and lower rings 120) that rotate around the central axis of the tube 150. Since a mechanism for moving in the radial direction is incorporated, a large width is required for the rotating member. For this reason, when manufacturing apparatuses, such as a boiler panel, in which the tubes 150 are arranged at a narrow pitch, the welding torch 100 cannot be used.

  In order to solve this problem, the applicant of the present application can move the welding torch in the radial direction of the tube and rotate around the central axis of the tube in the application (Japanese Patent Application No. 2012-203880) prior to the present application. A welding apparatus that can reduce the width of the rotating member has been proposed. An example of the welding apparatus is shown in FIG.

  A welding apparatus 200 shown in FIG. 10 includes a welding head 210 having a welding torch 240 and an apparatus main body (not shown) that moves the welding head 210 in two directions (directions orthogonal to each other) on a plane orthogonal to the axial direction of the tube. )including. More specifically, the welding head 210 includes a C-shaped rotating ring 230 to which a welding torch 240 is attached, and a table 220 that rotatably supports the rotating ring 230. The table 220 also supports a gear train 250 that transmits torque from the drive gear 260 attached to the output shaft of the motor 270 to the rotating ring 230. According to this configuration, the welding torch 240 can be moved in the radial direction of the tube by moving the table 220. For this reason, it is not necessary to provide a mechanism for moving the welding torch 240 in the rotating ring 230, and the width of the rotating ring 230 can be reduced.

  By the way, the welding torch 240 is connected to lines such as a power supply cable for applying a voltage to the electrode and a shield gas supply pipe for blowing a shielding gas from the periphery of the electrode through the inside of the welding torch 240. For this reason, the total thickness of the structure around the torch including the welding torch and the connecting portion of the lines is increased to some extent. Therefore, it is desired to reduce the lines in order to further reduce the total thickness of the torch peripheral configuration. The lines are wound around the tube as the welding torch 240 rotates. When manufacturing an apparatus in which tubes are arranged at a narrow pitch, it is necessary to pass the lines through a narrow gap between the tubes. From this point of view, reduction of the lines is desired.

  Therefore, an object of the present invention is to reduce the number of lines connected to a welding torch in a welding apparatus that rotatably supports a rotating ring to which a welding torch is attached by a table.

  In order to solve the above-described problem, a welding apparatus according to the present invention is a welding apparatus that performs butt welding of tubes, a welding torch including a conductive torch body and an electrode held by the torch body, and tube insertion An electrically conductive rotating ring having an opening for opening, a surface to which the welding torch is attached, and a back surface facing away from the surface, and is disposed to face the back surface of the rotating ring, and rotates the rotating ring A table having a notch for inserting a tube, which is supported, and is arranged between the rotating ring and the table so as to keep in contact with the back surface of the rotating ring during one rotation of the rotating ring. And a power supply brush configured as described above.

  According to said structure, since electric power is supplied to a welding torch via a rotating ring from a feed brush, it is not necessary to connect an electric power cable to a welding torch. Therefore, the lines connected to the welding torch can be reduced. Thereby, the total thickness of a torch periphery structure can be made thin. Moreover, since the power supply brush is disposed between the rotating ring and the table, the power supply brush can be protected from spatter generated during welding by the rotating ring and the table, and contamination of the power supply brush can be suppressed.

  The notch has a cylindrical surface portion, and a C-shaped tube that fits into the cylindrical surface portion extends from an inner peripheral edge of the back surface of the rotating ring, and the table passes through the C-shaped tube. The rotating ring may be rotatably supported. As a configuration for rotatably supporting the rotating ring on the table, it is conceivable to provide the table with a cylindrical portion that fits into the rotating ring. On the other hand, if the C-shaped tube extends from the inner peripheral edge of the back surface of the rotating ring as in the above configuration, the table can be made simple.

  A protrusion extending in the circumferential direction may be formed on one of the cylindrical surface portion and the C-shaped tube, and a support groove into which the protrusion is fitted may be formed on the other. According to this configuration, the relative movement of the table and the rotating ring in the axial direction of the C-shaped tube can be prevented without using a special member.

  The welding apparatus may further include an insulating cover that covers inner surfaces of the rotating ring and the C-shaped tube. According to this structure, even if an operator accidentally contacts the tube with the rotating ring or the C-shaped tube, an electrical short circuit between them can be prevented.

  For example, the power supply brush may be an arcuate member extending in the circumferential direction of the rotating ring, and may be pressed against the back surface of the rotating ring by an urging member.

  A power receiving groove that crosses the rotating ring in the circumferential direction is formed on the back surface of the rotating ring, and the power supply brush may be fitted to the power receiving groove. If only the rotating ring (or C-shaped tube) and table are fitted, the fitting may be disengaged depending on the orientation of the rotating ring and the rotating ring may fall off, so a configuration to prevent the rotating ring from falling off is required. It becomes. On the other hand, if the power supply brush is fitted in the power receiving groove formed on the back surface of the rotating ring as in the above-described configuration, the power supply brush can be used rationally to prevent the rotating ring from falling off.

  For example, the power supply brush may be composed of a plurality of brush pieces arranged in the circumferential direction.

  The rotating ring has external teeth, and the welding device includes a motor fixed to the table and having a driving gear attached to an output shaft, and a plurality of torques transmitted from the driving gear to the rotating ring. A gear train including a driven gear, wherein at least a part of the table is made of an insulating material so that the motor and the rotating ring are electrically insulated, and the drive gear and the driven gear At least one of the gears may be made of an insulating material. According to this configuration, it is possible to prevent welding electricity from being transmitted to the motor, and it is possible to prevent motor failure and the like.

  For example, the table may be divided into a first plate to which the motor is fixed and a second plate that defines the notch, and the first plate may be made of an insulating material.

  The second plate may be divided into a base plate that defines a central portion of the notch and a pair of tip plates that define both side portions of the notch. According to this configuration, when there is a C-shaped tube, the rotating ring and the C-shaped tube can be formed integrally.

  The base plate is made of a conductive metal and is configured to contact cooling water flowing through the circulation path, and the power supply brush may be connected to the base plate by a conductive member. According to this configuration, the welding torch can be cooled via the base plate, the conductive member, the power supply brush, and the rotating ring. Thereby, compared with the case where a cooling water supply pipe and a cooling water recovery pipe are connected as a line to the welding torch, the total thickness of the peripheral configuration of the torch can be further reduced.

  Further, a welding apparatus according to another aspect of the present invention is a welding apparatus that performs butt welding between tubes, and includes a welding torch including a conductive torch body and an electrode held by the torch body, and a tube insertion A conductive rotating ring having an opening, a surface to which the welding torch is attached, and a back surface facing away from the surface, and a rotating ring arranged to face the back surface of the rotating ring. A table formed with a tube insertion notch, and the rotating part of the table or a part that slides with the rotating ring together with the rotating ring is made of a conductive material. It is characterized by that.

  According to the above configuration, power can be supplied to the welding torch via the table and the rotating ring (in some cases, also via a member that rotates together with the rotating ring), so the power cable is connected to the welding torch. There is no need to do. Therefore, the lines connected to the welding torch can be reduced. Thereby, the total thickness of a torch periphery structure can be made thin.

  According to the present invention, lines connected to the welding torch can be reduced.

It is a schematic side view of the welding apparatus which concerns on one Embodiment of this invention. (A) And (b) is the front view and side view of the welding head which are respectively included in the said welding apparatus. It is the front view which expanded the principal part (2nd plate part of a table) of the said welding head. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. It is sectional drawing along the VV line of FIG. It is a front view of the half of the 2nd plate. It is a perspective view of a rotation ring and a C-shaped tube. It is a figure for demonstrating that the fall of a rotation ring is prevented. (A) And (b) is the front view and side view of the principal part of the conventional welding apparatus, respectively. It is a front view of the welding apparatus which the applicant of this application proposed previously.

  FIG. 1 shows a welding apparatus 1 according to an embodiment of the present invention. The welding apparatus 1 automatically performs butt welding between the tubes 10. In this embodiment, the tube 10 is placed sideways, and the welding apparatus 1 is placed on one tube 10 from above. However, the tube 10 does not necessarily have to be placed horizontally, and may be placed vertically or obliquely.

  The welding apparatus 1 includes a welding head 11 having a welding torch 4 and an apparatus main body 12 for operating the welding head 11. More specifically, the apparatus main body 12 includes a first moving mechanism that moves the welding head 11 in a first direction (eg, a vertical direction) orthogonal to the axial direction of the tube 10, and the welding head 11 in the axial direction of the tube 10 and the first direction. A second moving mechanism for moving in a second direction (for example, a horizontal direction) orthogonal to the one direction is included. The apparatus main body 12 may include a third movement mechanism that moves the welding head 11 in the axial direction of the tube 10. The apparatus main body 12 is provided with a clamp mechanism 13 that clamps the tube 10.

  As shown in FIGS. 2A and 2B, the welding head 11 includes a plate-like table 2 that is orthogonal to the axial direction of the tube 10, and a rotating ring 31 that is rotatably supported by the table 2. The rotating ring 31 has an opening 32 for tube insertion that opens in the radial direction, and is formed in a C shape by the opening 32. The table 2 is formed with a tube insertion notch 2a that opens in one direction (downward in FIG. 2A) with substantially the same width as the opening 32. In FIG. 3, the principal part of the welding head 11 is expanded and shown. However, in FIG. 3, in order to clearly show the shape of the table 2, the welding torch 4 and the rotating ring 31 are indicated by a two-dot chain line.

  More specifically, the rotating ring 31 has a back surface 31b (see FIG. 4) facing the table 2 and a front surface 31a facing the opposite side of the back surface 31b. In the present embodiment, the rotating ring 31 has a flat plate shape in the axial direction of the tube 10. And the welding torch 4 is attached to the surface 31a. For example, the welding torch 4 is disposed at the center of the rotating ring 31 (that is, the side opposite to the opening 32 across the center of the rotating ring 31). Furthermore, external teeth are formed on the outer peripheral surface of the rotating ring 31.

  2A and 2B, a motor 56 for rotating the rotating ring 31 is fixed to the back surface of the table 2 (the surface opposite to the rotating ring 31). A drive gear 55 is attached to the output shaft of the motor 56. The table 2 also supports a gear train 5 that transmits torque from the drive gear 55 to the rotating ring 31. In FIGS. 2A and 2B, the gear train 5 is indicated by a two-dot chain line for simplification of the drawing.

  The gear train 5 includes a first driven gear 51 that meshes with the drive gear 55, a pair of second driven gears 52 that mesh with the first driven gear 51, and a pair of third driven gears that mesh with each second driven gear 52 and the rotating member 31. A gear 53. With such a configuration, even if the opening 32 of the rotating member 31 reaches one third driven gear 53, torque is transmitted to the rotating member 31 by the other third driven gear 53.

  The rotating ring 31 is a conductive member and constitutes a part of a power supply route to the welding torch 4. Therefore, at least a part of the table 2 is made of an insulating material so that the motor 56 and the rotating ring 31 are electrically insulated, and at least one of the drive gear 55 and the driven gears 51 to 53 is an insulating material. It consists of

  In the present embodiment, the table 2 is divided into a first plate 21 to which the motor 56 is fixed and a second plate 22 that defines the notch 2a. Further, the second plate 22 is divided into a base plate 23 that defines the center of the notch 2a and a pair of tip plates 24 that define both side portions of the notch 2a. The first plate 21 and the tip plate 24 are made of an insulating material such as resin, and the base plate 23 is made of a conductive metal.

  In other words, the base plate 23 of the second plate 22 is interposed between the first plate 21 and the tip plate 24. Hereinafter, for convenience of explanation, the direction in which these plates 21, 23, and 24 are arranged is referred to as the vertical direction (the first plate 21 side is the upper side, and the tip plate 24 side is the lower side). A groove is provided in the lower end surface of the first plate 21 so as to cross the first plate 21 in the width direction, and a positioning projection 25 (see FIGS. 3 and 4) is provided in the upper end surface of the base plate 23. It has been. Although not shown, the base plate 23 and the tip plate 24 are also provided with positioning fitting portions. These plates 21, 23, and 24 are connected to each other by unillustrated bolts.

  However, the division | segmentation aspect of the table 2 is not limited to said aspect. For example, when the C-shaped tube 35 described later is divided into two pieces, the second plate 22 may be a single plate.

  In the present embodiment, the third driven gear 53 is made of an insulating material such as resin, and the other gears (the drive gear 55 and the driven gears 51 and 52) are made of metal. However, instead of the third driven gear 53, any of the second driven gear 52, the first driven gear 51, and the drive gear 55 may be made of an insulating material.

  As shown in FIG. 3, the notch 2a formed in the table 2 has a cylindrical surface portion 2b constituting the bottom of the notch 2a. As shown in FIG. 7, a C-shaped tube 35 fitted to the cylindrical surface portion 2 b extends in the thickness direction of the table 2 from the inner peripheral edge portion of the back surface 31 b of the rotating ring 31. That is, the table 2 supports the rotary ring 31 via the C-shaped tube 35 so as to be rotatable.

  More specifically, as shown in FIG. 4, a protrusion 36 extending in the circumferential direction is formed on the outer peripheral surface of the C-shaped tube 35. On the other hand, a support groove 27 into which the protrusion 36 is fitted is formed in the cylindrical surface portion 2b. However, contrary to the present embodiment, the protrusion 36 may be formed on the cylindrical surface portion 2 b and the support groove 27 may be formed on the C-shaped tube 35.

  The inner peripheral surface of the C-shaped tube 35 constitutes a surface that is continuous with the inner peripheral surface of the rotating ring 31. These inner peripheral surfaces are covered with an insulating cover 38. More specifically, an annular recess 34 is formed on the inner peripheral edge of the surface 31 a of the rotating ring 31, and an annular recess 37 is formed on the inner peripheral edge of the end surface of the C-shaped tube 35. The insulating cover 38 has a substantially U-shaped cross section, and both end portions of the insulating cover 38 protruding outward in the radial direction are engaged with the recesses 34 and 37.

  As shown in FIG. 4, the welding torch 4 attached to the surface 31 a of the rotating ring 31 includes a conductive torch body 41 and an electrode 42 held on the torch body 41. In the present embodiment, the electrode 42 is a non-consumable electrode. That is, the welding performed by the welding apparatus 1 is, for example, TIG (Tungsten Inert Gas) welding or plasma arc welding. In addition, although illustration is abbreviate | omitted, the front-end | tip of the wire supply apparatus which supplies a welding wire between the electrode 42 and the tube 10 is fixed to the welding torch 4.

  The torch body 41 has a plate shape orthogonal to the radial direction of the tube 10. For example, the electrode 42 is held by the torch body 41 via the gas lens 43. Although illustration is omitted, the gas lens 43 has a double tube structure in which a shielding gas is blown out from the periphery of the electrode 42, and a mesh laminate is disposed therein. However, the electrode 42 may be fixed to the torch body 41 by other means such as a push bolt.

  The torch body 41 is provided with a shield gas port 44 and an internal flow path 45 that guides shield gas from the shield gas port 44 to the gas lens 43. A shield gas supply pipe (not shown) is connected to the shield gas port 44.

  As shown in FIGS. 3 and 5, a power supply brush 61 is disposed between the rotating ring 31 and the table 2. The power supply brush 61 is configured to keep in contact with the back surface 31b of the rotating ring 31 while the rotating ring 31 makes one rotation.

  In the present embodiment, the power supply brush 61 is an arc-shaped member that extends in the circumferential direction of the rotating ring 31. The power supply brush 61 is pressed against the back surface 31 b of the rotating ring 31 by a plurality of urging members (for example, compression coil springs) 65. In the present embodiment, the power supply brush 61 is composed of a plurality (two in the illustrated example) of brush pieces 61a. However, the power supply brush 61 may be composed of a single block extending in the circumferential direction with a length that crosses the opening 32 of the rotating ring 31.

  As shown in FIG. 7, a power receiving groove 33 that crosses the rotating ring 31 in the circumferential direction is formed on the back surface 31 b of the rotating ring 31. Each brush piece 61 a is engaged with the power receiving groove 33.

  More specifically, as shown in FIG. 6, two recesses 26 are formed in the base plate 23 of the second plate 22 of the table 2, and brush pieces 61 a are inserted into the recesses 26. In addition, since the base plate 23 is a right and left object, only half of one side is shown in FIG. 6, and only the concave portion 26 on one side will be described below.

  The recess 26 has an arcuate substantially trapezoidal shape in which the upper side and both sides are vertical and the lower side is parallel to the arcuate surface portion 2b in plan view. The recess 26 is provided with a pair of extended portions 26a that extend the lower side 2b to both sides, and both ends of the brush piece 61a are fitted into the extended portions 26a.

  The bottom surface 26b of the recess 26 is provided with a plurality (three in the illustrated example) of circular bottomed holes 28 in a region overlapping with the brush piece 61a, and the biasing member 65 is held in these holes 28. Yes. In addition, a stepped portion 26 c that slightly reduces the depth of the recess 26 is formed on the upper surface of the bottom surface 26 b of the recess 26. And the screw hole 29 is provided in this level | step-difference part 26c.

  Returning to FIG. 5, the brush piece 61 a is connected to the base plate 23 by the conductive member 62. In the present embodiment, the conductive member 62 is a flat knitted copper wire, and is joined to the brush piece 61a by soldering. A presser plate 63 is disposed on the conductive member 62. The conductive member 62 is fixed together with the presser plate 63 by a screw 64 that is screwed into the screw hole 29 described above. The lower end portion of the pressing plate 63 is slightly bent so as to restrain the conductive member 62 from being deformed by a predetermined amount or more in the urging direction of the urging member 65. Thereby, when the rotation ring 31 rotates and the fitting between the brush piece 61a and the power receiving groove 33 is disengaged (in other words, when the entire brush piece 61a is located in the opening 32), the brush piece 61a. Does not go out of the recess 26 too much. As shown in FIG. 7, tapered surfaces for pushing the brush piece 61 a when the brush piece 61 a reaches the power receiving groove 33 from the opening 32 are formed at both ends of the power receiving groove 33. However, the conductive member 62 may be a plate having a certain degree of rigidity. In this case, the presser plate 63 can be omitted.

  A power cable (not shown) is connected to the base plate 23. For this reason, electric power is supplied to the welding torch 4 through the base plate 23, the conductive member 62, the power supply brush 61, and the rotating ring 31.

  Further, in the present embodiment, the base plate 23 is configured to contact the cooling water flowing through the circulation path. Specifically, a flow path member 71 having a circulation path 73 through which cooling water flows is fixed to the back surface of the base plate 23 so as to be in surface contact. The flow path member 71 extends in the width direction of the base plate 23 (in the left-right direction in FIG. 3) so as to straddle both the concave portions 26. A pair of ports 72 (see FIG. 3) communicating with the circulation path 73 are provided at both ends of the flow path member 71, and a cooling water supply pipe and a cooling water recovery pipe are connected to these ports 72. Thereby, the feeding route and the cooling route become the same route. However, the flow path member 71 can be omitted, and the circulation path 73 can be formed inside the base plate 23.

  As described above, in the welding apparatus 1 according to the present embodiment, power is supplied to the welding torch 4 from the power supply brush 61 via the rotating ring 31, so there is no need to connect a power cable to the welding torch 4. Therefore, the lines connected to the welding torch 4 can be reduced. Thereby, the total thickness of a torch periphery structure can be made thin. Further, since the power supply brush 61 is disposed between the rotating ring 31 and the table 2, the power supply brush 61 can be protected from spatter generated during welding by the rotating ring 31 and the table 2. Can be suppressed.

  By the way, it is possible to provide the table 2 with the cylindrical part fitted in the rotation ring 31 as a structure which supports the rotation ring 31 to the table 2 so that rotation is possible. On the other hand, if the C-shaped tube 41 extends from the inner peripheral edge of the back surface 31b of the rotating ring 2 as in the present embodiment, the table 2 can be made simple.

  Further, in the present embodiment, since the projection 36 is formed on the C-shaped tube 35 and the support groove 27 in which the projection 36 is fitted is formed on the cylindrical surface portion 2b of the notch 2a, the axial direction of the C-shaped tube 35 is determined. Relative movement of the table 2 and the rotating ring 31 can be prevented without using a special member.

  Furthermore, in this embodiment, since the inner peripheral surfaces of the rotating ring 31 and the C-shaped tube 35 are covered with the insulating cover 38, an operator accidentally makes the tube 10 contact the rotating ring 31 or the C-shaped tube 35. Can also prevent electrical shorts between them.

  In the present embodiment, since the motor 56 fixed to the table 2 and the rotating ring 31 are electrically insulated, it is possible to prevent welding electricity from being transmitted to the motor 56. A failure of the motor 56 can be prevented in advance.

  Further, since the second plate 22 of the table 2 is divided into the base plate 23 and the tip plate 24, the rotating ring 31 and the C-shaped tube 35 can be integrally formed.

  Furthermore, in this embodiment, the welding torch 4 can be cooled by the cooling water flowing through the circulation path 73 via the base plate 23, the conductive member 62, the power supply brush 61 and the rotating ring 31. Thereby, compared with the case where a cooling water supply pipe and a cooling water recovery pipe are connected to the welding torch 4 as lines, the total thickness of the torch peripheral configuration can be further reduced.

(Other embodiments)
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, the power receiving groove 33 can be omitted. In this case, if the C-shaped tube 35 (or the rotating ring 31) and the table 2 are merely fitted, the fitting may be removed depending on the orientation of the rotating ring 31, and the rotating ring 31 may fall off. For this reason, a configuration for preventing the rotation ring 31 from falling off is required.

  For example, as shown in FIG. 8, when the rotating ring 31 is rotated 90 degrees, the fitting angle A between the C-shaped tube 35 and the table 2 is 180 degrees or less. In addition, the C-shaped tube 35 is supported from below by only one tip plate 24. Then, there is a certain distance B from the end of the C-shaped tube 35 located in the notch 2a to the other end plate 24. For this reason, if there is no structure which prevents drop-off, the C-shaped tube 35 falls downward through the notch 2a.

  On the other hand, if the power supply brush 61 is fitted in the power receiving groove 33 formed on the back surface 31b of the rotating ring 31 as in the above embodiment, the C-shaped tube 35 is also fitted by the fitting even in the state shown in FIG. The fall through the notch 2a is prevented. For this reason, dropping off of the rotating ring 31 can be prevented by using the power supply brush 61 rationally.

  Further, the welding torch 4 is not necessarily cooled by the cooling water, and may be cooled by air sent from a fan or the like.

  Further, when the cooling water is not used and the power supply cable is directly connected to the power supply brush 6, the table 2 may be a single resin plate, for example.

  In addition, the power supply brush 61 is not necessarily configured by the plurality of brush pieces 61 a, and may be configured by a plurality of leaf springs arranged in the circumferential direction of the rotating ring 31, for example.

  Furthermore, if the member (the C-shaped tube 35 in the embodiment) that slides with the rotating ring 31 in the table 2 is made of a conductive material (for example, metal), the power supply brush 61 is not necessarily required. Absent. In the embodiment, the C-shaped tube 35 that rotates together with the rotating ring 31 and the base plate 23 that slides are made of a conductive metal. That is, since electric power can be supplied to the welding torch 4 via the table 2, the C-shaped tube 35 and the rotating ring 31, it is not necessary to connect a power cable to the welding torch 4. Therefore, the lines connected to the welding torch 4 can be reduced. Thereby, the total thickness of a torch periphery structure can be made thin.

  As a configuration in which the rotary ring 31 is rotatably supported by the table 2, when the cylindrical portion that fits into the rotary ring 31 is provided on the table 2, the cylindrical portion provided on the table 2 rotates the rotary ring. 31 is a portion that slides. Therefore, if the part including the cylindrical part in the table 2 is made of a conductive material, the power supply brush 61 can be omitted as described above.

  Further, the electrode 42 is not necessarily a non-consumable electrode, and may be a consumable electrode. That is, the welding performed by the welding apparatus 1 may be MIG welding, for example. In this case, the welding wire serving as the electrode may be held on the torch body 41 via, for example, a power feeding welding tip. In this case, the torch body 41 does not necessarily have a plate shape, and may have a rod shape inserted through a welding wire. That is, the application range of the present invention is not limited to an apparatus in which tubes are arranged at a narrow pitch.

  The present invention is widely applicable to butt welding of tubes for various uses.

DESCRIPTION OF SYMBOLS 1 Welding apparatus 2 Table 2a Notch 2b Cylindrical surface part 21 1st plate 22 2nd plate 23 Base plate 24 Tip plate 27 Support groove 31 Rotating ring 31a Surface 31b Back surface 32 Opening 33 Power receiving groove 35 C-shaped pipe 36 Projection 38 Insulation cover 4 Welding Torch 41 Torch body 42 Electrode 5 Gear train 51 to 53 Driven gear 55 Drive gear 56 Motor 61 Power supply brush 61a Brush piece 62 Conductive member 65 Energizing member 73 Circulation path

Claims (9)

A welding device that performs butt welding between tubes,
A welding torch including a conductive torch body and an electrode held by the torch body;
A conductive rotating ring having a tube insertion opening, a surface to which the welding torch is attached, and a back surface facing away from the surface;
A table on which a notch for inserting a tube is formed, which is arranged so as to face the back surface of the rotating ring, and rotatably supports the rotating ring;
A power supply brush arranged between the rotating ring and the table and configured to keep in contact with the back surface of the rotating ring while the rotating ring makes one rotation ,
The notch has a cylindrical surface portion;
A C-shaped tube that fits with the cylindrical surface portion extends from the inner peripheral edge of the back surface of the rotating ring, and the table rotatably supports the rotating ring via the C-shaped tube,
One of the cylindrical surface portion and the C-shaped tube is formed with a protrusion extending in the circumferential direction, and the other is formed with a support groove into which the protrusion is fitted . Further comprising the rotary ring and the insulating cover which covers the inner peripheral surface of the C-shaped tube, welding apparatus according to claim 1. The feeding brush is arcuate member extending in the circumferential direction of the rotating ring, it is pressed against the rear surface of the rotary ring by a biasing member, the welding device according to claim 1 or 2. On the back surface of the rotating ring, a power receiving groove that crosses the rotating ring in the circumferential direction is formed,
The welding apparatus according to claim 3 , wherein the power supply brush is fitted in the power receiving groove. The welding device according to claim 3 or 4 , wherein the power supply brush is configured by a plurality of brush pieces arranged in a circumferential direction. A welding device that performs butt welding between tubes,
A welding torch including a conductive torch body and an electrode held by the torch body;
A conductive rotating ring having a tube insertion opening, a surface to which the welding torch is attached, and a back surface facing away from the surface;
A table on which a notch for inserting a tube is formed, which is arranged so as to face the back surface of the rotating ring, and rotatably supports the rotating ring;
A power supply brush arranged between the rotating ring and the table and configured to keep in contact with the back surface of the rotating ring while the rotating ring makes one rotation,
The rotating ring has external teeth;
A motor fixed to the table and having a drive gear attached to the output shaft;
A gear train including a plurality of driven gears for transmitting torque from the drive gear to the rotating ring;
At least a part of the table is made of an insulating material so that the motor and the rotating ring are electrically insulated, and at least one of the drive gear and the driven gear is made of an insulating material. , welding equipment. The table is divided into a first plate to which the motor is fixed and a second plate that defines the notch,
The welding apparatus according to claim 6 , wherein the first plate is made of an insulating material. The welding apparatus according to claim 7 , wherein the second plate is divided into a base plate that defines a central portion of the notch and a pair of tip plates that define both side portions of the notch. The base plate is made of a conductive metal and is configured to come into contact with cooling water flowing through the circulation path.
The welding apparatus according to claim 8 , wherein the power supply brush is connected to the base plate by a conductive member.

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