JPH055290U - Welding head for pipe welding - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the welding torch attached to the rotating body and the cables connected to the wire holder at the tip from loosening. [Structure] A rotating body 3 having a welding torch 4 and a wire holder 5 rotatably attached to a welding head 1, cables 22 whose ends are guided to the welding torch 4 and the wire holder 5, and a motor 2. Rotating body 3
A drive roller 12 that is rotated by the rotation of the gear 8; and a pressure roller 18 that is urged against the drive roller 12 to sandwich the cables 22 between the drive roller 12 and the drive roller 12. Rotating body 3 in the direction in which cables 22 loosen
When is rotated, the drive rollers 12 and the pressure roller 18 pull the cables 22 so as not to loosen them.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a welding head for pipe welding, in which a welding head having a rotating body does not cause trouble due to loosening of cables.

[0002]

[Prior Art]

 In order to weld a pipe or the like, a welding head equipped with a rotating body having a welding torch, a wire holder, etc. has been conventionally used for welding work.

An example of a conventional welding head used for welding a pipe will be described with reference to FIG. 3. A horseshoe-shaped rotating body b is rotatably attached to the tip of the welding head a. A welding torch c, a wire holder (not shown) for supplying a welding wire, a nozzle for shielding gas, and the like are provided in b.

The welding torch c, a wire holder, a nozzle, and the like (not shown) are connected to the ends of cables d such as long cables and hoses, and supply current, wires, gas, etc. necessary for welding. The cables d are in contact with the free roller e attached to the welding head a and extend toward the power source and the gas supply source.

When performing the welding operation with the welding head a in FIG. 3, the pipe f to be welded is inserted into the center of the horseshoe-shaped rotating body b, and the rotating body b is rotated by the motor provided in the welding head a. Then, the pipe f is welded.

[0006]

[Problems to be solved by the device]

 When the rotating body b rotates counterclockwise in FIG. 3, the cables d are pulled by the welding torch c and the like, and are fed while coming into contact with the free roller e.

When the rotating body b is rotated in the clockwise direction while the cables d are being drawn out, the cable d is slackened and caught on another device or the like, or the rotating body b and the free roller e. However, there is a drawback in that it requires a manual process due to the involvement of h between the and.

The present invention solves the above-mentioned conventional drawbacks and prevents welding or welding of pipes even if the rotating body rotates in the direction in which cables are loosened. It is intended to provide the code.

[0009]

[Means for Solving the Problems]

 The present invention has a welding torch attached, a rotating body that rotates around a pipe, a drive roller, and a pressure roller that is pressed by the drive roller. The cable guide holds the cables and guides them to the welding torch. Means, a motor that drives the rotation of the rotating body and the drive roller, and the drive roller is rotated in the cable feeding direction when the cables are fed by the rotation of the rotating body, and the drive roller is pulled in when the rotating body is reversed. The present invention relates to a welding head for pipe welding, comprising: a power transmission mechanism that rotates in a direction.

[0010]

[Action]

 When the motor is driven to rotate the rotating body via the power transmission mechanism, the drive roller of the cable guide means is also rotated via the power transmission mechanism, and the cables sandwiched between the drive roller and the pressure roller are removed. , Pulled so as not to sag.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. 1. As shown in FIG. 1, a motor 2 is attached to the base of the welding head 1. At the tip of the welding head 1, a horseshoe-shaped rotating body 3 is attached so as to rotate around the pipe 23. The rotating body 3 is provided with a welding torch 4 and a wire holder 5 for supplying a welding wire. The welding torch 4 is integrally provided with a shield gas nozzle or the like (not shown).

The motor 2 rotationally drives a bevel gear 6 to rotate a bevel gear 7 meshing with the bevel gear 6. The bevel gear 7 is coaxial with a gear 8 having a large diameter and a large diameter. It is adapted to rotate together with the small gear 9. The intermediate pinions 10, 10 meshing with the gear 8 mesh with the sector gear 11 mounted on the rotating body 3 to form a power transmission mechanism 25A for driving the rotating body, and the motor 2 rotates the bevel gear 6. When driven, the rotating body 3 is rotated via the bevel gear 7, the gear 8, the intermediate pinions 10 and 10, and the sector gear 11.

As shown in FIG. 2, a driving roller 12 is projected from the side surface of the welding head 1, and a shaft 13 integrated with the driving roller 12 is rotatably supported by the welding head 1 by bearings 14 and 14. ing. The pinion 15 fixed to the shaft 13 meshes with the above-described gear 9 to form a power transmission mechanism 25B for driving the drive roller.

Therefore, in FIG. 1, when the bevel gear 7 and the gears 8 and 9 rotate counterclockwise by the rotational driving of the bevel gear 6, the rotating body 3 rotates counterclockwise and the drive roller 12 rotates clockwise. Come to do.

When the bevel gear 6 is rotationally driven in the opposite direction to the above, and the bevel gear 7, gears 8 and 9 are rotated in the clock direction, the rotating body 3 is rotated in the clockwise direction, and the drive roller 12 is rotated in the counterclockwise direction. It comes to rotate.

As shown in FIGS. 1 and 2, the base end of the crankshaft 16 is rotatably attached to the welding head 1 by bearings 17 and 17 (see FIG. 2), and the crankshaft 16 has a tip end side on the tip side. The pressure roller 18 is rotatably supported by bearings 19 and 19 (see FIG. 2). Further, flanges 20 attached to the crankshaft 16 are attached to both ends of the pressure roller 18.

A tensioned coil spring 21 is stretched between one flange 20 and the welding head 1, and biases the pressure roller 18 in a direction approaching the drive roller 12. The cables guide means 24 is configured. The welding torch 4 shown in FIG. 1 and the cables 22 such as cables connected to the wire holder 5 at their tips and hoses (the wires are supported so as to be movable in the guide hose) are connected to the drive roller 12. It extends through the pressure roller 18 toward a power source, a wire source, and a fluid source.

Next, the operation will be described.

In FIG. 1, when the bevel gear 7, the gears 8 and 9 rotate counterclockwise and the rotating body 3 rotates counterclockwise, the drive roller 12 rotates clockwise, so that the drive roller 12 and the pressure roller are rotated. The cables 22 sandwiched between 18 and 18 are extended toward the welding torch 4 and the wire holder 5.

When the bevel gear 7, the gears 8 and 9 rotate clockwise and the rotating body 3 rotates clockwise, the drive roller 12 rotates counterclockwise, so that the drive roller 12 and the pressure roller 18 are rotated. The cables 22 that are extended toward the welding torch 4 and the wire holder 5 sandwiched between them are pulled between the drive roller 12 and the pressure roller 18 and move to the right in FIG. There is no slack between the rotating body 3 and the drive roller 12 and no entanglement.

[0022]

[Effect of the device]

 In the present invention, the cables are paid out or pulled in accordance with the rotation of the rotating body, so that the cables are not detached from the rotating body, are not caught by being loosened, or are caught and damaged.

Therefore, the operator can concentrate on the welding work without paying attention to the condition of the cables.

Of course, the present invention can be applied to welding without a wire, such as non-filler welding.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a side view of a conventional device.

[Explanation of symbols]

 1 Welding head 2 Motor 3 Rotating body 4 Welding torch 5 Wire holder 8 Gear 12 Drive roller 18 Pressure roller 22 Cables 24 Cables guide means 25A Power transmission mechanism 25B Power transmission mechanism

Claims (1)

[Claims for utility model registration] [Claim 1] A welding torch is attached, a rotating body that rotates around a pipe, a drive roller and a pressure roller pressed by the drive roller, and holds cables. Cable guide means for guiding the welding torch to the welding torch, a motor for driving the rotation of the rotating body and the drive roller, and the drive roller is rotated in the cable delivery direction at the time of feeding the cables by the rotation of the rotating body. A welding head for pipe welding, comprising a power transmission mechanism for rotating a drive roller in a cable pull-in direction when reversing.