JP6769238B2 - Welder - Google Patents

Description

The present invention relates to a welding machine for welding pipes, tubes and the like.

Conventionally, in performing butt welding and fillet welding of metal pipes and tubes, a type of welding machine has been used in which a welding torch is orbited around an object pipe or tube to automatically weld. In this type of welder, electricity, water and shield gas need to be supplied to the weld torch during welding, which are sent to the weld site via pipes such as cables connected to the weld torch. At this time, since the welding torch orbits around the object over 360 °, the cable following the welding torch wraps around the object.

Welding requires supplying a large current to the welding torch to melt the metal, but the value of the current that can be passed through the wire is proportional to the diameter of the wire. Therefore, if a single cable is used to supply power to the welding torch, a large-diameter lead wire is inevitably used for the cable.

However, the larger the diameter of the conducting wire constituting the cable, the higher the rigidity and the more difficult it is to bend. Therefore, if an excessively thick conducting wire is used, the operation of the welding torch may be hindered. Therefore, in order to supply sufficient current while ensuring good operability of the welding torch, a plurality of cables consisting of conducting wires having a small diameter are provided, and a large current is supplied to the welding torch as the total value of the currents flowing through each cable. The method is generally adopted.

Then, when power is supplied using a plurality of cables in this way, the welding torch orbits around the object with the plurality of cables. The larger the number of cables that follow the welding torch, the bulkier the cables will be. Therefore, when using a welding machine as described above, it is necessary to have enough space around the object for the welding torch to move with the bundle of cables. Become. Further, if welding is to be performed with a small current, the welding torch must be reciprocated many times around the object, which reduces the efficiency of the welding work. That is, the above-mentioned welding machine is not very suitable for welding in a place where thin pipes are densely packed, for example. Further, if a large number of cables are wound around the object, the visibility of the welded portion deteriorates, which is also a problem in ensuring the welding quality.

As a prior art document that describes a technique that can deal with such a problem of a welding machine, for example, there is the following Patent Document 1. In Patent Document 1, a feeding brush is arranged between a rotating ring that rotates with respect to a table together with a welding torch and the table that supports the rotating ring, and the rotating ring is arranged from the table side via the feeding brush. It is described that by supplying power to the side, the power cable for power supply is omitted and the lines connected to the welding torch are reduced.

JP-A-2015-178113

However, the welding machine (welding apparatus) described in Patent Document 1 has a weakness in the method of feeding power by a feeding brush. First, since it is difficult for the power supply brush to keep the condition of the contact part with the power supply target constant, it is considered that the value of the current supplied to the rotating ring, which is the power supply target, varies and it is difficult to perform uniform welding. Be done. There is also a problem of wear due to the rotating ring coming into contact with the feeding brush while rotating. If the feeding brush wears as a result of repeated use, the resistance value at the contact portion changes and affects the current value, so it is difficult to keep the welding quality constant for a long period of time. In addition, the problem of dust generated by wear cannot be ignored.

In view of such circumstances, the present invention aims to provide a welding machine capable of maintaining a stable current value during welding while reducing the number of pipes.

The present invention is arranged between a rotating body provided with a welding torch and rotating around an object, a pedestal portion that rotatably supports the rotating body, and the rotating body and the pedestal portion, and the rotating body. The conductor includes a conductor having a conical rotating surface that rotates while contacting at least one of the rotating body or the pedestal portion with the rotation of the conductor, and the rotating shaft of the conductor is in the radial direction of the rotating body. A welding machine arranged along the line and in a direction in which the diameter increases toward the outer side in the radial direction of the rotating body, and is configured to transmit the power supplied to the pedestal side to the rotating body side via the conductor. It depends on.

In concretely implementing the welding machine of the present invention, the pedestal portion is a table provided with a recess for sandwiching the object, and the rotating body is arranged in the recess with a notch for passing the object. The conductor can be arranged between the rotating body and the table at a position where the rotating body and the table face each other.

In the welding machine of the present invention, the conductor is arranged between the table and the rotating body which are overlapped in the axial direction of the rotating body so that the rotation axis is along the radial direction of the rotating body. It can be configured to roll while bringing the rotating surface into contact with the rotating body and the table as the rotating body and the table are rotated.

In the welding machine of the present invention, the conductor has a shaft having a circular cross section and being supported by one of the table or a rotating body, and an outer peripheral body having a circular cross section and rotating around the shaft. , A plurality having a circular cross section and arranged between the shaft and the outer peripheral body, and rolling while contacting the inner peripheral surface of the outer peripheral body and the outer peripheral surface of the shaft as the outer peripheral body rotates. The outer peripheral body may be configured to come into contact with the other of the table or the rotating body on the outer peripheral surface and rotate with respect to the axis as the rotating body rotates.

According to the welding machine of the present invention, it is possible to achieve an excellent effect that a stable current value can be maintained during welding while reducing the number of pipes.

It is a front view which shows the embodiment of 1st Embodiment of this invention. It is a top view which shows the embodiment of the 1st Example of this invention. It is sectional drawing explaining the form of the conductor and the passage thereof in 1st Example of this invention. It is a top view which shows the operating state of 1st Example of this invention, (A) is the initial state, (B) is the state which rotated 180 ° prior to welding, (C) is the state immediately after welding. Shown. It is a top view which shows the embodiment of the 2nd Example of this invention. It is a perspective view which shows the form of the conductor in the 2nd Example of this invention. It is a front view which shows the form of the reference example of this invention. It is a top view which shows the form of the reference example of this invention. It is a front view which shows the embodiment of the 3rd Example of this invention. It is a top view which shows the embodiment of the 3rd Example of this invention. It is a figure which shows the form of the conductor in the 3rd Example of this invention, (A) is a perspective view, (B) is a sectional view.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 4 show an example (first embodiment) of the form of the welding machine according to the implementation of the present invention. As shown in FIG. 1, the welding machine 1 of the first embodiment includes a welding torch 2 and uses the welding torch 2 as an object 3 such as a pipe or a tube (in the example shown here, an axis along the vertical direction). A head portion 4 that circulates around the head portion 4 including the welding torch 2 and a main body portion 5 that incorporates a mechanism for driving and controlling the head portion 4 including the welding torch 2. In the following, basically, the case where the lower end of the object 3 extending in the vertical direction is welded to the horizontal plane by fillet welding will be described, but the arrangement of the object 3 and the welding machine 1 is based on this. Not limited to this, for example, the direction of the object 3 may be a horizontal direction or an oblique direction. In addition to fillet welding, it can also be applied to butt welding and the like.

The main body portion 5 is placed on a horizontal plane and supports the head portion 4 at an appropriate position with respect to the object 3. The main body 5 is provided with a drive mechanism (not shown) for moving the head 4 in a direction along the axis of the object 3 or in a direction orthogonal to the axis of the object 3, thereby targeting the position of the head 4. It is possible to make fine adjustments to the object 3. Since the case where the object 3 is fillet welded to the horizontal surface is described here, if the main body 5 is placed on the horizontal surface, the entire welding machine 1 can be arranged at an appropriate position with respect to the object 3. However, in addition to this, for example, assuming the case where the object 3 is welded to the vertical surface or the pipes as the object 3 are welded by butt welding, for example, a clamp that sandwiches the pipe or tube, etc. , A mechanism for fixing the main body 5 as appropriate may be provided separately.

The head portion 4 is rotatable about a table 6 as a pedestal portion supported by the main body portion 5 in a plane orthogonal to the object 3 and an axis along the direction of the object 3 with respect to the table 6. A ring-shaped rotating body (rotating ring) 7 supported by the vehicle is provided. A welding torch 2 is attached to the rotating ring 7 so as to rotate around the object 3 together with the welding torch 2 during welding. The welding torch 2 includes a tip portion 2a that discharges an object 3, and a support portion 2b that supports the tip portion 2a so as to be tiltable and supports the entire welding torch 2 with respect to the rotating ring 7. The support portion 2b has a total of three coolant cables 8 for supplying or recovering coolant (here, water) to the welding torch 2 and a gas cable 9 for supplying shield gas for protecting the molten metal. Piping is connected. Further, a power cable 10 for supplying electricity as welding energy is connected to the upper surface of the table 6. In addition, from FIG. 2, the coolant cable 8 and the gas cable 9 are not shown as appropriate depending on the drawings for convenience of explanation. Further, the rotating ring 7 is rotatably supported on the table 6 by, for example, a turntable-like mechanism composed of an insulator, but this mechanism is not directly related to the gist of the present invention and is not directly related to the gist of the present invention. Since the whole figure becomes complicated if the figure is shown, the figure is omitted in all the figures.

As shown in FIG. 2, the surface formed by the table 6 constituting the head portion 4 is provided with a recess 6a for sandwiching the object 3, and the rotating ring 7 is arranged therein. Further, the rotating ring 7 is an annular member having a notch 7a in a part thereof, and is formed in a C shape as a whole in a plan view. Then, by passing the object 3 through the notch 7a, the rotating ring 7 can be arranged around the object 3. A welding torch 2 is attached to the lower surface of the rotating ring 7 at a position opposite to the notch 7a in the circumferential direction of the rotating ring 7. The tip of the welding torch 2 is configured so that the angle can be appropriately changed by a drive mechanism (not shown). In the following, for convenience of explanation, the direction along the rotation axis of the rotating ring 7 is defined as the vertical direction, the side to which the welding torch 2 is attached to the rotating ring 7 is defined as the downward direction, and the opposite side is defined as the upward direction. It shall be.

The rotary ring 7 is rotatably attached to the lower surface of the table 6 as a pedestal portion that supports the rotary ring 7 with respect to the table 6, and the rotation is driven by a plurality of gears provided in the head portion 4. It has become so. A tooth profile is formed on the outer periphery of the rotating ring 7 so as to mesh with the gears 11 and 11, the gears 11 and 11 mesh with the gears 12 and 12, and the gears 12 and 12 mesh with the drive gear 13. The power input to the drive gear 13 from a motor (not shown) is transmitted to the rotating ring 7, and the rotating ring 7 is rotated with respect to the table 6.

Further, a conductive mechanism 14 is interposed between the table 6 and the rotating ring 7, and the conductive mechanism 14 allows the rotating ring 7 to rotate with respect to the table 6 while supplying electric power to the table 6. Is transmitted to the welding torch 2 on the rotating ring 7 side.

In the case of the first embodiment, as shown in FIGS. 1 and 2, the conductive mechanism 14 has a roller-type conductor 15 sandwiched between a table 6 and a rotating ring 7 which are vertically overlapped with each other. The form of the conductor 15 and its arrangement with respect to the table 6 and the rotating ring 7 are shown in FIG. 3 in a cross-sectional view. The conductor 15 is a truncated cone-shaped object composed of a conductive substance, and in the first embodiment, each rotation axis of the plurality of conductors 15 is along the radial direction of the rotating ring 7 and is radially outside. The conductors 15 are arranged radially in a direction in which the diameter of the conductors 15 increases toward the direction of (see FIG. 2). The conductor 15 is housed in a passage 16 composed of C-shaped grooves 16a and 16b formed so as to face each other on the upper surface of the rotating ring 7 and the lower surface of the table 6 facing the conductor 15. While the 7 rotates with respect to the table 6, the conical surface, which is a rotating surface, rotates while being in contact with the bottom surface of the groove 16a and the bottom surface of the groove 16b, and moves in the passage 16 while rolling along with the movement of the rotating ring 7. It has become like. The grooves 16a and 16b are formed so as to be deeper toward the outside with respect to the radial direction of the rotating ring 7, and are formed in the vertical direction of the passage 16 according to the shape of the conductor 15 located between the grooves 16a and 16b. The size of is increasing toward the outside in the radial direction.

As shown in FIG. 2, the groove 16b formed on the table 6 side has both ends facing the recess 6a, but both ends are not opened toward the recess 6a and are located on the edge of the recess 6a. It is closed by a partition wall 16c formed along it. The partition wall 16c prevents the conductor 15 that has moved to the end near the recess 6a while rolling in the C-shaped passage 16 from falling over the end into the recess 6a. It has become like.

Here, the configuration of the passage 16 is not limited to the example described above. For example, two C-shaped flanges may be projected from the lower surface of the table 6 or the upper surface of the rotating ring 7, and a passage 16 may be formed between the flanges. In addition, the passage 16 may have various configurations as long as the movement of the conductor 15 accompanying the rotation of the rotating ring 7 can be appropriately defined.

As shown in FIG. 2, the conductor 15 is centered on the central portion 16d of the groove 16b with respect to the circumferential direction of the rotating ring 7 in a plan view at an initial position where the position of the notch 7a of the rotating ring 7 coincides with the opening of the recess 6a. It is arranged so as to be within the range of 90 ° (the range shown by the alternate long and short dash line in FIG. 2). Further, both ends of the groove 16b are preferably separated from the conductor 15 at the position farthest from the central portion 16d at the initial position by 90 ° or more with respect to the circumferential direction of the rotating ring 7 in a plan view. That is, when the conductor 15 is arranged within a range of 90 ° about the central portion 16d of the groove 16b, both end portions of the groove 16b are separated from the central portion 16d by 135 ° or more in the circumferential direction of the rotating ring 7. (The range indicated by the alternate long and short dash line in FIG. 2). This is an arrangement for preventing sliding between the conductor 15 and the table 6 or the rotating ring 7 as much as possible due to the rotation of the rotating ring 7. The effects of this arrangement will be described in detail later.

Spacers or the like may be appropriately arranged between the conductors 15 in the passage 16 in order to prevent the conductors 15 from being displaced from each other. However, a spacer or the like is provided between the conductor 15 located farthest from the central portion 16d at the initial position and both ends of the groove 16b so as not to hinder the movement of the conductor 15 accompanying the rotation of the rotating ring 7. It is advisable not to place it, or to place a spacer of sufficiently small size. Further, although the case where a total of three conductors 15 are provided is illustrated here, the number of conductors 15 can be increased or decreased.

The materials of at least the portions of the rotating ring 7 and the table 6 facing each other are conductive, and the rotating ring 7 and the table 6 can be energized via the conductor 15. On the other hand, between the rotary ring 7 and the motor (not shown) for driving the drive gear 13 or the drive mechanism (not shown) for moving the head portion 4 with respect to the main body portion 5, for example, one of the gears 11 and 12 and the table 6 It is insulated by measures such as configuring the part with an insulator.

Next, the operation of the first embodiment described above will be described.

When welding the object 3 with the above-mentioned welding machine 1, first, as shown in FIG. 4A, welding is performed so that the recess 6a of the table 6 and the rotating ring 7 are located so as to surround the object 3. Place the machine 1. At this time, the rotary ring 7 is at the initial position where the position of the notch 7a coincides with the opening of the recess 6a, and by passing the object 3 through the recess 6a and the notch 7a, the welding machine 1 is positioned appropriately for welding. Can be placed in. After arranging the welding machine 1, the head portion 4 is appropriately operated by a drive mechanism (not shown) to position the rotating ring 7 and the welding torch 2 with respect to the welded portion of the object 3. At this time, the angle of the tip portion 2a of the welding torch 2 is also operated to adjust so that the discharge portion at the tip is located at the welded portion of the object 3 (see FIG. 1).

Next, the rotating ring 7 is rotated by 180 °, and the welding torch 2 is positioned on the side opposite to the initial position with respect to the object 3 as shown in FIG. 4 (B). Here, the case where the rotating ring 7 is rotated clockwise is shown, and the coolant cable 8 and the gas cable 9 connected to the welding torch 2 are wound around the object 3 from the lower side in the drawing. Follows the welding torch 2.

Further, as the rotating ring 7 rotates, the conductor 15 arranged between the table 6 and the rotating ring 7 moves clockwise so as to roll in the passage 16. Since the rotation angle of the rotating ring 7 is 180 °, the amount of movement of each conductor 15 following the rotation angle is 90 ° clockwise.

At this time, as described above, the conductor 15 is arranged within a range of 90 ° about the central portion 16d of the groove 16b at the initial position, and the end portion of the groove 16b on the table 6 side is 135 ° or more from the central portion 16d. They are located apart (see FIGS. 2 and 4 (A)). Therefore, even if the conductor 15 moves 90 ° clockwise in the passage 16, the conductor 15 reaches the end of the groove 16b as long as the conductor 15 rolls correctly in the passage 16. There is no.

That is, assuming that the distance between the conductor 15 and the end of the groove 16b at the initial position is less than 90 ° in the circumferential direction, the rotating ring 7 is located at the end when rotated by 180 °. The conductor 15 does not have enough space to roll in the groove 16b, and reaches the end of the groove 16b. As described above, the end portion of the groove 16b is provided with a partition wall 16c for preventing the conductor 15 from falling off, and the conductor 15 reaching the end portion of the groove 16b comes into contact with the partition wall 16c and moves further. Is hindered. Then, when the rotating ring 7 continues to rotate while the conductor 15 is in contact with the partition wall 16c, between the conductor 15 that tries to roll while staying at the position of the partition wall 16c and the table 6 or the rotating ring 7. Sliding will occur. The arrangement of the conductor 15 and the groove 16b described above is a configuration for ensuring a sufficient space for the conductor 15 to roll when the rotating ring 7 is rotated so as to prevent such a situation.

Subsequently, the object 3 is welded. Water and shield gas are supplied to the welding torch 2 from the coolant cable 8 and the gas cable 9, respectively, and current is supplied to the power cable 10 (see FIG. 1), while rotating from the arrangement shown in FIG. 4 (B). Rotate the ring 7 counterclockwise 360 °.

During this time, the coolant cable 8 and the gas cable 9 move around the object 3 so as to follow the welding torch 2 and wind counterclockwise. Further, the conductor 15 rotates 180 ° counterclockwise from the position shown in FIG. 4 (B) to the position shown in FIG. 4 (C) while rolling in the passage 16 following the rotation of the rotating ring 7. Moving. Then, due to the positional relationship between the groove 16b and the conductor 15 as described above, the rolling space of each conductor 15 is secured in the groove 16b even during the 360 ° rotation.

That is, in the initial position, as shown in FIG. 4A, the conductor 15 located on the rearmost side (that is, the upper side in the figure) in the clockwise direction is the end portion of the groove 16b located on the upper side in the figure. It is located at a distance of 90 ° or more in the circumferential direction from. In the rotation before welding from here to the arrangement shown in FIG. 4B, the conductor 15 rotates 90 ° clockwise, so that it is separated from the upper end of the groove 16b by 180 ° or more. Therefore, in the subsequent welding process, even if the conductor 15 moves 180 ° counterclockwise to the arrangement shown in FIG. 4C, it does not reach the upper end of the groove 16b. In this way, while the object 3 is being welded while rotating the rotating ring 7, the conductor 15 keeps in contact with both the table 6 and the rotating ring 7 to maintain an electrical connection between the table 6 and the table 6. The current supplied from the power cable 10 (see FIG. 2) can be transmitted to the welding torch 2 on the rotating ring 7 side.

At this time, each conductor 15 is in contact with the table 6 and the rotating ring 7 while rolling. Unless, for example, the conductor 15 slides in the passage 16 for some reason, the conductor is basically a conductor. No sliding occurs between the 15 and the table 6 or the rotating ring 7. Therefore, the problem of instability of the current value due to sliding and the problem of wear and the generation of dust associated therewith do not occur. According to the welding machine 1 of the first embodiment, a stable current can be supplied to the welding torch 2 during welding by the conductor 15 that moves while rolling between the table 6 and the rotating ring 7. Further, the conductor 15 does not always slide and wear due to the rotation of the rotating ring 7, and welding of stable quality can be performed for a long period of time.

Further, here, the conductor 15 is formed in a truncated cone shape as described above, and is arranged so that its diameter increases toward the outer side in the radial direction of the rotating ring 7, and the grooves 16a and 16b forming the passage 16 are arranged. Is also formed according to the shape of the conductor 15. This is a configuration according to the difference in the amount of movement between the inside and the outside in the radial direction accompanying the rotation of the rotating ring 7. That is, when the rotating ring 7 rotates, the moving distance in the circumferential direction in each part of the rotating ring 7 is smaller toward the inner side in the radial direction and larger toward the outer side. On the other hand, considering the case where the rotating surface of the conductor 15 is formed in a cylindrical shape having a constant diameter, when the conductor 15 rolls, it is located at all points in the axial direction of the conductor 15. The surface of revolution rolls at the same speed. Therefore, when the conductor 15 rolls with the rotation of the rotating ring 7, even if one of the rotating surfaces of the conductor 15 rolls at the same speed as the movement of the rotating ring 7. The other portion will move at a speed different from that of the rotating ring 7, and as a result, sliding will occur between the conductor 15 and the rotating ring 7 or the table 6. Therefore, if the conductor 15 is formed in a truncated cone shape as shown in FIG. 3, when the conductor 15 rolls, the larger the diameter, the faster the conductor 15, and the rotating ring 7 can move at all points on the rotating surface. It can be synchronized with the rotation, and the occurrence of sliding can be suppressed.

When the welding is completed, the rotating ring 7 is rotated 180 ° clockwise and returned to the initial position shown in FIG. 4 (A). This completes the welding process.

In the above series of steps, the coolant cable 8 and the gas cable 9 follow the welding torch 2 on the rotating ring 7 side and move so as to wrap around the object 3, but the power cable 10 moves to the table 6 side. It is connected and does not move around the object 3 (see FIGS. 1 and 2). That is, the number of cables wound around the object 3 during welding can be reduced or the volume can be reduced by the amount of the power cable 10 as compared with the conventional case.

Here, with respect to the coolant cable 8, power is supplied to the welding torch and cooling of the welding torch and the power cable (heat associated with energization of the small diameter conductor) by flowing the coolant through the power cable along the conductor. There is a conventional example in which the same cable is used to prevent melting in the same cable, and the number of cables is not necessarily reduced as compared with this. In other words, assuming a conventional welding machine equipped with three or more power cables, it can be said that the total number of cables is smaller than that, but when compared with a welding machine with two power cables that also serve as coolant cables, The number of cables is the same. However, in the case of the coolant cable 8 that only feeds the coolant without passing electric power, the diameter of the cable can be reduced by the amount of the lead wire, and this advantage is great. This is because if the volume of the cable can be reduced, the space required around the object 3 for welding can be significantly reduced. Further, if the number and volume of cables wound around the object 3 are small, the visibility of the welded portion becomes good during the welding work, and it becomes easy to monitor the welding torch 2 during welding and check the quality after welding. .. Further, since the welding torch 2 has a space for connecting the power cable 10, it is possible to mount a camera or the like for monitoring the welding portion here.

Alternatively, if the electric power supplied to the welding torch 2 is sufficiently small, there is no concern that the welding torch 2 will be melted by heat, so that the coolant cable 8 itself may not be required (not shown). In this case, only one gas cable 9 is connected to the welding torch 2 and follows the welding torch 2 during welding, and the effects of saving space around the welding torch 2 and improving visibility are further greater. ..

Further, not only the configuration related to the periphery of the welding torch 2 can be simplified, but also the configuration of the power cable 10 is advantageous. That is, since the power cable 10 does not wrap around the object 3, it is not necessary to divide the power cable 10 into a plurality of cables having a small diameter in consideration of rigidity and space. Since it is sufficient to use a small number of large-diameter power cables 10 capable of passing a large current, the structure related to the power cables 10 can be simplified and the entire welding machine 1 can be made compact.

As described above, in the first embodiment, the rotating body (rotating ring) 7 provided with the welding torch 2 and rotating around the object 3 and the pedestal portion 6 that rotatably supports the rotating body 7 And a conductor 15 arranged between the rotating body 7 and the pedestal portion 6 and having a rotating surface that rotates while contacting the rotating body 7 and the pedestal portion 6 with the rotation of the rotating body 7. The conductor is configured to transmit the power supplied to the pedestal portion 6 side to the rotating body 7 side via the conductor 15, so that the conductor rotates with the rotation of the rotating body 7 at the time of welding. By maintaining the contact between the pedestal portion 6 and the rotating body 7 via the 15, the power supplied to the pedestal portion 6 is suitable for the rotating body 7 side while preventing the occurrence of sliding due to the rotation as much as possible. Can be communicated to.

Further, in the first embodiment, the pedestal portion 6 is configured as a table provided with a recess 6a for sandwiching the object 3, and the rotating body 7 is provided with a notch 7a through which the object 3 is passed and the recess 6a is provided. Since the conductor 15 is arranged between the rotating body 7 and the table 6 at a position where the rotating body 7 and the table 6 face each other, the recess 6a and the rotating body 7 of the table 6 are arranged. The welding machine 1 can be arranged so as to surround the object 3 so that the welding operation can be preferably performed.

Further, in the first embodiment, the conductor 15 has a direction in which the rotation axis is along the radial direction of the rotating body 7 between the table 6 and the rotating body 7 overlapping in the axial direction of the rotating body 7. Since it is configured to roll while bringing the rotating surface into contact with the rotating body 7 and the table 6 as the rotating body 7 rotates, the occurrence of sliding due to the rotation is effectively prevented. While doing so, power can be suitably transmitted to the rotating body 7 side.

Therefore, according to the first embodiment, it is possible to maintain a stable current value during welding while reducing the number of pipes.

5 and 6 show a second embodiment of the present invention. The basic configuration is the same as that of the first embodiment described above, but in the case of the conductive mechanism 18 provided in the welding machine 17 of the second embodiment, a groove formed on the upper surface of the rotating ring 19 as shown in FIG. A tooth profile is formed in the groove 21a formed on the lower surface of the table 20 and the table 20. On the other hand, as shown in FIG. 6, a tooth profile is also formed on the conical surface which is the rotating surface of the truncated cone-shaped conductor 22, and the tooth profiles formed above and below the passage 21 are the tooth profiles of the conical surface of the conductor 22, respectively. It is designed to mesh with. Then, when the rotating ring 19 rotates, the conductor 22 rolls while meshing the tooth profile of the conical surface with the tooth profile formed in the passage 21. In this way, there is no concern that the conductor 22 slides in the passage 21 regardless of rolling. Therefore, in the case of the second embodiment, the first embodiment described above. A configuration such as the partition wall 16c (see FIG. 2) is not required.

That is, when the conductor 15 is formed as a cylindrical roller as in the first embodiment (see FIG. 2) described above, the conductor 15 slides in the passage 16 for some reason. Can happen. In that case, even if a sufficient distance is provided between the end of the groove 16b and the conductor 15 at the initial position, the conductor 15 reaches the end of the groove 16b as the rotating ring 7 rotates. There is a possibility that it will end up. In the first embodiment, the partition wall 16c is provided in order to prevent the conductor 15 from falling off from the end of the groove 16b in preparation for such a case, but it is guided as in the second embodiment. If the conductor 22 is rolled while meshing the tooth profile between the electron 22 and the passage 21, the conductor 22 will not be displaced with respect to the passage 21.

The other functions and effects related to the second embodiment are the same as those of the first embodiment, and thus the description thereof will be omitted. However, also in the second embodiment, the current value is stable during welding while reducing the number of pipes. Can be kept.

7 and 8 show reference examples of the present invention. The basic configuration is the same as in the first and second embodiments described above, but in the case of the conductive mechanism 24 provided in the welding machine 23 of this reference example, the rotating ring 25 and the table 26 are partially radially oriented. The conductors 28 are overlapped and are arranged between the outer peripheral surface of the rotating ring 25 and the outer peripheral surface of the C-shaped groove 27a formed on the lower surface of the table 26.

That is, in the case of this reference example, the upper 25a of the rotating ring 25 is housed in the groove 27a, and the space between the outer peripheral surface of the upper 25a of the rotating ring 25 and the outer peripheral surface of the groove 27a is configured as a passage 27 of the conductor 28. Has been done. The rotation axes of the conductors 28 are arranged along the axial direction, not in the radial direction of the rotation ring 25, and the conductors 28 are centered on the vertical axis as the rotation ring 25 rotates. , It is configured to roll in the passage 27 while contacting the outer peripheral surface of the rotating ring 25 and the outer peripheral surface of the groove 27a. With this configuration, the rotating surface of the conductor 28 is not a truncated cone shape, but a cylindrical shape having equal diameters at various points along the axial direction.

A tooth profile is formed on the outer peripheral surface of the lower stage 25b of the rotating ring 25, and meshes with the gear 11 here to drive the rotation accompanying the welding work.

As shown in FIG. 8, partition walls 27b for preventing the conductor 28 from falling off are formed at both ends of the groove 27a along the edge of the recess 26a of the table 26. The arrangement of the conductors 28 in the passage 27 is the same as in the first and second embodiments (see FIGS. 2 and 5) described above, and the central portion of the groove 27a with respect to the circumferential direction of the rotating ring 25 in a plan view at the initial position. It is arranged so as to be within a range of 90 ° centered on 27c. Further, both ends of the groove 27a are formed at positions separated from the central portion 27c by 135 ° or more in the circumferential direction in a plan view.

When the conductive mechanism 24 is configured in this way, the rotating ring 25, the conductor 28, and the table 26 overlap in the radial direction, so that the radial dimensions are slightly larger than those in the first and second embodiments described above. On the other hand, since the conductor 28 is not sandwiched between the rotating ring 25 and the table 26 in the vertical direction, the thickness in the axial direction can be reduced.

Here, in this reference example, the passage 27 is formed between the outer peripheral surface of the groove 27a formed on the table 26 side and the outer peripheral surface of the upper 25a of the rotating ring 25, but on the contrary, for example. A groove is formed on the rotating ring 25 side, a convex portion is formed on the lower surface of the table 26, and the convex portion is housed in the groove, and between the outer peripheral surface of the convex portion and the outer peripheral surface of the groove. It is also possible to arrange the conductor 28 in the structure. Alternatively, a conductor 28 may be arranged between the inner peripheral surface of the groove 27a formed on the table 26 side and the inner peripheral surface of the rotating ring 25, and this may be configured as the passage 27.

Further, in this reference example, the conductor 28 is arranged around the upper 25a of the rotating ring 25 so as to mesh with the gear 11 on the outer circumference of the lower 25b, but on the contrary, the conductor 28 is guided around the lower 25b. An electron 28 may be arranged so as to mesh with the gear 11 on the outer circumference of the upper 25a. In addition, the arrangement of the rotating ring 25, the table 26, the conductor 28, and the like may have various configurations other than the examples shown here.

As described above, in the above reference example, the conductor 28 has a rotation axis along the axial direction of the rotating body 25 between the table 26 and the rotating body 25 overlapping in the radial direction of the rotating body 25. Since the rotating body 25 and the table 26 are arranged so as to roll while the rotating surface is in contact with the rotating body 25, the rotating body 25 and the table 26 are arranged so as to roll while the rotating body is brought into contact with the rotating body. It can be suitably transmitted to the 25 side.

The other functions and effects related to this reference example will be omitted because they are the same as those in the first embodiment. However, even in this reference example, a stable current value can be maintained during welding while reducing the number of pipes.

9 to 11 show a third embodiment of the present invention. The basic configuration is the same as that of the first , second and reference examples described above, but in the case of the conductive mechanism 30 provided in the welding machine 29 of the third embodiment, FIGS. 11 (A) and 11 (B) are shown. As shown in the above, the conductor 31 is configured to support the outer peripheral body 31c around a shaft 31a fixed to the table 32 side via a meson 31b.

The outer peripheral body 31c is a truncated cone-shaped hollow conductor forming a rotating surface of the conductor 31, and is rotatable about a conductive shaft 31a that forms a central axis of the outer peripheral body 31c and penetrates the outer peripheral body 31c. It is configured in. In the internal space of the outer peripheral body 31c, a plurality of truncated cone-shaped mesons 31b are arranged between the outer peripheral body 31c and the shaft 31a. The shaft 31a, each intermediate 31b, and the outer peripheral body 31c each have a circular cross section, and each intermediate 31b has an outer peripheral surface of the shaft 31a and an inner peripheral surface of the outer peripheral body 31c over the entire axial direction. It has a diameter equal to the distance between them. Then, when the outer peripheral body 31c rotates about the shaft 31a, each meson 31b follows this and rolls between the outer peripheral body 31c and the shaft 31a so as to support the outer peripheral body 31c with respect to the shaft 31a. It has become. In this way, while the outer peripheral body 31c rotates around the shaft 31a, the intermediate element 31b continues to contact both the outer peripheral surface of the shaft 31a and the inner peripheral surface of the outer peripheral body 31c, so that the rotation of the outer peripheral body 31c with respect to the shaft 31a is allowed. , The outer peripheral body 31c and the shaft 31a can be energized.

In the third embodiment, as shown in FIGS. 9 and 10, the conductor 31 having such a configuration has a shaft 31a along the radial direction of the rotating ring 33, and the diameter of the outer peripheral body 31c is the diameter of the rotating ring 33. Multiple pieces are arranged radially in a direction that increases toward the outside.

A recess 34a for accommodating each conductor 31 is formed on the lower surface of the table 32, and both ends of the shaft 31a of the conductor 31 are supported by the inner surfaces of the recess 34a facing each other in the radial direction of the rotating ring 7. .. The outer peripheral body 31c of the conductor 31 is not in contact with the inner surface of the recess 34a, and the outer peripheral body 31c rotates without directly contacting the table 32.

On the other hand, a C-shaped groove 34b is formed on the upper surface of the rotating ring 33 in a plan view, and the groove 34b is in contact with the outer peripheral body 31c of the conductor 31 on the bottom surface. The groove 34b is formed so as to match the shape of the truncated cone-shaped outer peripheral body 31c and become deeper toward the outside in the radial direction of the rotating ring 33.

In the conductive mechanism 30 having such a configuration, as the rotating ring 33 rotates, the outer peripheral body 31c forming the rotating surface of the conductor 31 comes into contact with the bottom surface of the groove 34b formed in the rotating ring 33 and is centered on the shaft 31a. Rotate. During this time, the outer peripheral body 31c forming the rotating surface keeps in contact with the shaft 31a via the meson 31b inside, so that the rotating ring 33 keeps in contact with the table 32 via the outer peripheral body 31c, the meson 31b, and the shaft 31a. , An electrical connection is secured between the rotating ring 33 and the table 32.

In the case of the third embodiment, unlike the first , second and reference examples , the position of the conductor 31 does not move with respect to the table 32. Therefore, for example, as shown in FIG. 10, it is possible to arrange the four conductors 31 substantially evenly in the circumferential direction of the rotating ring 33.

Here, in the third embodiment, the table 32 is provided with a recess 34a so that the recess 34a supports a straight shaft 31a. In addition to this, for example, the table 32 has a configuration such as a recess or a groove. It is also possible to bend both ends of the shaft 31a toward the lower surface of the table 32 and fix both ends of the shaft 31a to the lower surface. Further, in the third embodiment, the conductor 31 is provided on the table 32 side, but on the contrary, the conductor 31 is supported on the upper surface of the rotating ring 33, and the outer peripheral body 31c of the conductor 31 is supported on the table 32 side. Can also be configured to contact.

As described above, in the third embodiment, the conductor 31 has a circular cross section, a shaft 31a supported by one of the table 32 or the rotating body 33, and a circular cross section. An outer peripheral body 31c that rotates around the shaft 31a and an outer peripheral body 31c that has a circular cross section and is arranged between the shaft 31a and the outer peripheral body 31c, and an inner peripheral surface of the outer peripheral body with the rotation of the outer peripheral body 31c. And a plurality of intermediates 31b that roll while contacting the outer peripheral surface of the shaft 31a, the outer peripheral body 31c contacts the other of the table 32 or the rotating body 33 on the outer peripheral surface, and the rotating body 33 rotates. Since it is configured to rotate with respect to the shaft 31a, power can be suitably transmitted to the rotating body 33 side while effectively preventing the occurrence of sliding due to the rotation.

This Other operations and effects according to the third embodiment, the description thereof is omitted because it is similar to the above-described first embodiment, the third embodiment also, a stable current value during reduction while welding the pipes Can be kept.

The welding machine of the present invention is not limited to the above-described embodiment. For example, in the conductive mechanism of the third embodiment, it is also possible to form a tooth profile on the rotating surface of the conductor as in the second embodiment so as to mesh with the table or the rotating body . Of course, various changes can be made without departing from the gist of the present invention.

1 Welding machine 2 Welding torch 3 Object 6 Table (pedestal)
6a Recess 7 Rotating ring (rotating body)
7a Notch 15 Conductor 17 Welder 19 Rotating ring (rotating body)
20 Table 22 Conductor 23 Welder 25 Rotating ring (rotating body)
26 Table 26a Recess 28 Conductor 29 Welder 31 Conductor 31a Shaft 31b Meson 31c Outer body 32 Table 33 Rotating ring (rotating body)

Claims (4)

A rotating body equipped with a welding torch that rotates around the object,
A pedestal that rotatably supports the rotating body and
A conductor arranged between the rotating body and the pedestal portion and having a conical rotating surface that rotates while being in contact with the rotating body or at least one of the pedestal portions as the rotating body rotates. Prepare,
The conductor is arranged so that the axis of rotation is along the radial direction of the rotating body and the diameter becomes larger toward the outer side in the radial direction of the rotating body.
A welding machine configured to transmit electric power supplied to the pedestal portion side to the rotating body side via the conductor. The pedestal portion is configured as a table provided with a recess for sandwiching an object.
The rotating body is arranged in the recess with a notch through which the object passes.
The welding machine according to claim 1, wherein the conductor is arranged between the rotating body and the table at a position where the rotating body and the table face each other. The conductor is arranged between the table and the rotating body which are overlapped in the axial direction of the rotating body so that the rotation axis is along the radial direction of the rotating body, and the rotating body rotates with the rotation of the rotating body. The welding machine according to claim 2, which is configured to roll while bringing a rotating surface into contact with the body and the table. The conductor has a shaft having a circular cross section and being supported by one of the table or a rotating body, an outer peripheral body having a circular cross section and rotating around the shaft, and a circular cross section. A plurality of intermediates are provided between the shaft and the outer peripheral body, and roll while contacting the inner peripheral surface of the outer peripheral body and the outer peripheral surface of the shaft as the outer peripheral body rotates. The welding machine according to claim 2, wherein the body is configured to come into contact with the other of the table or the rotating body on the outer peripheral surface and rotate with respect to the shaft as the rotating body rotates.

Images